David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1 | /* |
Ian Abbott | f6fef5d | 2015-01-28 18:41:45 +0000 | [diff] [blame] | 2 | * comedi/comedi_fops.c |
| 3 | * comedi kernel module |
| 4 | * |
| 5 | * COMEDI - Linux Control and Measurement Device Interface |
| 6 | * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 18 | |
H Hartley Sweeten | c2ad078 | 2014-07-17 12:27:32 -0700 | [diff] [blame] | 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 20 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 21 | #include "comedi_compat32.h" |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/sched.h> |
| 27 | #include <linux/fcntl.h> |
| 28 | #include <linux/delay.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 29 | #include <linux/mm.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/kmod.h> |
| 32 | #include <linux/poll.h> |
| 33 | #include <linux/init.h> |
| 34 | #include <linux/device.h> |
| 35 | #include <linux/vmalloc.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include "comedidev.h" |
| 38 | #include <linux/cdev.h> |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 39 | #include <linux/stat.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 40 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 41 | #include <linux/io.h> |
| 42 | #include <linux/uaccess.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 43 | |
Ian Abbott | 3a5fa27 | 2012-06-19 10:17:44 +0100 | [diff] [blame] | 44 | #include "comedi_internal.h" |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 45 | |
Ian Abbott | 63107ce | 2015-09-18 15:46:23 +0100 | [diff] [blame] | 46 | /* |
Ian Abbott | eb340ac | 2015-04-21 13:18:11 +0100 | [diff] [blame] | 47 | * comedi_subdevice "runflags" |
Ian Abbott | 63107ce | 2015-09-18 15:46:23 +0100 | [diff] [blame] | 48 | * COMEDI_SRF_RT: DEPRECATED: command is running real-time |
| 49 | * COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred |
Ian Abbott | eb340ac | 2015-04-21 13:18:11 +0100 | [diff] [blame] | 50 | * since the last command was started |
Ian Abbott | 63107ce | 2015-09-18 15:46:23 +0100 | [diff] [blame] | 51 | * COMEDI_SRF_RUNNING: command is running |
| 52 | * COMEDI_SRF_FREE_SPRIV: free s->private on detach |
Ian Abbott | eb340ac | 2015-04-21 13:18:11 +0100 | [diff] [blame] | 53 | * |
Ian Abbott | 63107ce | 2015-09-18 15:46:23 +0100 | [diff] [blame] | 54 | * COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy" |
Ian Abbott | eb340ac | 2015-04-21 13:18:11 +0100 | [diff] [blame] | 55 | */ |
| 56 | #define COMEDI_SRF_RT BIT(1) |
| 57 | #define COMEDI_SRF_ERROR BIT(2) |
| 58 | #define COMEDI_SRF_RUNNING BIT(27) |
| 59 | #define COMEDI_SRF_FREE_SPRIV BIT(31) |
| 60 | |
| 61 | #define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING) |
| 62 | |
| 63 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 64 | * struct comedi_file - Per-file private data for COMEDI device |
| 65 | * @dev: COMEDI device. |
| 66 | * @read_subdev: Current "read" subdevice. |
| 67 | * @write_subdev: Current "write" subdevice. |
| 68 | * @last_detach_count: Last known detach count. |
| 69 | * @last_attached: Last known attached/detached state. |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 70 | */ |
| 71 | struct comedi_file { |
| 72 | struct comedi_device *dev; |
| 73 | struct comedi_subdevice *read_subdev; |
| 74 | struct comedi_subdevice *write_subdev; |
| 75 | unsigned int last_detach_count; |
| 76 | bool last_attached:1; |
| 77 | }; |
| 78 | |
Ian Abbott | eda5682 | 2013-04-04 14:59:02 +0100 | [diff] [blame] | 79 | #define COMEDI_NUM_MINORS 0x100 |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 80 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
| 81 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) |
Ian Abbott | eda5682 | 2013-04-04 14:59:02 +0100 | [diff] [blame] | 82 | |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 83 | static int comedi_num_legacy_minors; |
Matias Mucciolo | 6e30293 | 2016-09-12 10:18:59 -0300 | [diff] [blame] | 84 | module_param(comedi_num_legacy_minors, int, 0444); |
Ian Abbott | 4d7df82 | 2012-04-13 14:12:53 +0100 | [diff] [blame] | 85 | MODULE_PARM_DESC(comedi_num_legacy_minors, |
| 86 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" |
| 87 | ); |
| 88 | |
Ian Abbott | 234bb3c | 2012-04-13 14:12:54 +0100 | [diff] [blame] | 89 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
Matias Mucciolo | 6e30293 | 2016-09-12 10:18:59 -0300 | [diff] [blame] | 90 | module_param(comedi_default_buf_size_kb, uint, 0644); |
Ian Abbott | 4d7df82 | 2012-04-13 14:12:53 +0100 | [diff] [blame] | 91 | MODULE_PARM_DESC(comedi_default_buf_size_kb, |
| 92 | "default asynchronous buffer size in KiB (default " |
Ian Abbott | 234bb3c | 2012-04-13 14:12:54 +0100 | [diff] [blame] | 93 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
Ian Abbott | 4d7df82 | 2012-04-13 14:12:53 +0100 | [diff] [blame] | 94 | |
Ian Abbott | 234bb3c | 2012-04-13 14:12:54 +0100 | [diff] [blame] | 95 | unsigned int comedi_default_buf_maxsize_kb |
| 96 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; |
Matias Mucciolo | 6e30293 | 2016-09-12 10:18:59 -0300 | [diff] [blame] | 97 | module_param(comedi_default_buf_maxsize_kb, uint, 0644); |
Ian Abbott | 4d7df82 | 2012-04-13 14:12:53 +0100 | [diff] [blame] | 98 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, |
| 99 | "default maximum size of asynchronous buffer in KiB (default " |
Ian Abbott | 234bb3c | 2012-04-13 14:12:54 +0100 | [diff] [blame] | 100 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
Bernd Porr | 1dd33ab | 2008-12-08 23:30:13 +0000 | [diff] [blame] | 101 | |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 102 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 103 | static struct comedi_device |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 104 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
| 105 | |
| 106 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); |
| 107 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 108 | static struct comedi_subdevice |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 109 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 110 | |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 111 | static struct class *comedi_class; |
| 112 | static struct cdev comedi_cdev; |
| 113 | |
| 114 | static void comedi_device_init(struct comedi_device *dev) |
| 115 | { |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 116 | kref_init(&dev->refcount); |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 117 | spin_lock_init(&dev->spinlock); |
| 118 | mutex_init(&dev->mutex); |
Ian Abbott | 2f3fdcd | 2013-11-08 15:03:24 +0000 | [diff] [blame] | 119 | init_rwsem(&dev->attach_lock); |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 120 | dev->minor = -1; |
| 121 | } |
| 122 | |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 123 | static void comedi_dev_kref_release(struct kref *kref) |
| 124 | { |
| 125 | struct comedi_device *dev = |
| 126 | container_of(kref, struct comedi_device, refcount); |
| 127 | |
| 128 | mutex_destroy(&dev->mutex); |
Ian Abbott | 8f988d8 | 2013-12-11 14:51:02 +0000 | [diff] [blame] | 129 | put_device(dev->class_dev); |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 130 | kfree(dev); |
| 131 | } |
| 132 | |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 133 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 134 | * comedi_dev_put() - Release a use of a COMEDI device |
| 135 | * @dev: COMEDI device. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 136 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 137 | * Must be called when a user of a COMEDI device is finished with it. |
| 138 | * When the last user of the COMEDI device calls this function, the |
| 139 | * COMEDI device is destroyed. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 140 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 141 | * Return: 1 if the COMEDI device is destroyed by this call or @dev is |
| 142 | * NULL, otherwise return 0. Callers must not assume the COMEDI |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 143 | * device is still valid if this function returns 0. |
| 144 | */ |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 145 | int comedi_dev_put(struct comedi_device *dev) |
| 146 | { |
| 147 | if (dev) |
| 148 | return kref_put(&dev->refcount, comedi_dev_kref_release); |
| 149 | return 1; |
| 150 | } |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 151 | EXPORT_SYMBOL_GPL(comedi_dev_put); |
| 152 | |
| 153 | static struct comedi_device *comedi_dev_get(struct comedi_device *dev) |
| 154 | { |
| 155 | if (dev) |
| 156 | kref_get(&dev->refcount); |
| 157 | return dev; |
| 158 | } |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 159 | |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 160 | static void comedi_device_cleanup(struct comedi_device *dev) |
| 161 | { |
| 162 | struct module *driver_module = NULL; |
| 163 | |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 164 | if (!dev) |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 165 | return; |
| 166 | mutex_lock(&dev->mutex); |
| 167 | if (dev->attached) |
| 168 | driver_module = dev->driver->module; |
| 169 | comedi_device_detach(dev); |
Ian Abbott | 1363e4f | 2013-12-11 14:51:03 +0000 | [diff] [blame] | 170 | if (driver_module && dev->use_count) |
| 171 | module_put(driver_module); |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 172 | mutex_unlock(&dev->mutex); |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 173 | } |
| 174 | |
Ian Abbott | db210da | 2013-04-04 14:59:18 +0100 | [diff] [blame] | 175 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
| 176 | { |
| 177 | unsigned int i = dev->minor; |
| 178 | bool cleared = false; |
| 179 | |
| 180 | mutex_lock(&comedi_board_minor_table_lock); |
| 181 | if (dev == comedi_board_minor_table[i]) { |
| 182 | comedi_board_minor_table[i] = NULL; |
| 183 | cleared = true; |
| 184 | } |
| 185 | mutex_unlock(&comedi_board_minor_table_lock); |
| 186 | return cleared; |
| 187 | } |
| 188 | |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 189 | static struct comedi_device *comedi_clear_board_minor(unsigned int minor) |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 190 | { |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 191 | struct comedi_device *dev; |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 192 | |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 193 | mutex_lock(&comedi_board_minor_table_lock); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 194 | dev = comedi_board_minor_table[minor]; |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 195 | comedi_board_minor_table[minor] = NULL; |
| 196 | mutex_unlock(&comedi_board_minor_table_lock); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 197 | return dev; |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 198 | } |
| 199 | |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 200 | static void comedi_free_board_dev(struct comedi_device *dev) |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 201 | { |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 202 | if (dev) { |
Ian Abbott | 52ef9e7 | 2014-01-07 12:38:32 +0000 | [diff] [blame] | 203 | comedi_device_cleanup(dev); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 204 | if (dev->class_dev) { |
| 205 | device_destroy(comedi_class, |
| 206 | MKDEV(COMEDI_MAJOR, dev->minor)); |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 207 | } |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 208 | comedi_dev_put(dev); |
Ian Abbott | d9740a0 | 2013-04-04 14:58:55 +0100 | [diff] [blame] | 209 | } |
| 210 | } |
Ian Abbott | 8ab4ed6 | 2013-04-04 14:58:54 +0100 | [diff] [blame] | 211 | |
Ian Abbott | b2073dc | 2016-03-29 10:49:04 +0100 | [diff] [blame] | 212 | static struct comedi_subdevice * |
| 213 | comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned int minor) |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 214 | { |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 215 | struct comedi_subdevice *s; |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 216 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
| 217 | |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 218 | mutex_lock(&comedi_subdevice_minor_table_lock); |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 219 | s = comedi_subdevice_minor_table[i]; |
Ian Abbott | 63ab039 | 2013-11-08 15:03:42 +0000 | [diff] [blame] | 220 | if (s && s->device != dev) |
| 221 | s = NULL; |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 222 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 223 | return s; |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 224 | } |
| 225 | |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 226 | static struct comedi_device *comedi_dev_get_from_board_minor(unsigned int minor) |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 227 | { |
| 228 | struct comedi_device *dev; |
| 229 | |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 230 | mutex_lock(&comedi_board_minor_table_lock); |
| 231 | dev = comedi_dev_get(comedi_board_minor_table[minor]); |
| 232 | mutex_unlock(&comedi_board_minor_table_lock); |
| 233 | return dev; |
| 234 | } |
| 235 | |
Ian Abbott | b2073dc | 2016-03-29 10:49:04 +0100 | [diff] [blame] | 236 | static struct comedi_device * |
| 237 | comedi_dev_get_from_subdevice_minor(unsigned int minor) |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 238 | { |
| 239 | struct comedi_device *dev; |
| 240 | struct comedi_subdevice *s; |
| 241 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
| 242 | |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 243 | mutex_lock(&comedi_subdevice_minor_table_lock); |
| 244 | s = comedi_subdevice_minor_table[i]; |
| 245 | dev = comedi_dev_get(s ? s->device : NULL); |
| 246 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
| 247 | return dev; |
| 248 | } |
| 249 | |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 250 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 251 | * comedi_dev_get_from_minor() - Get COMEDI device by minor device number |
| 252 | * @minor: Minor device number. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 253 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 254 | * Finds the COMEDI device associated with the minor device number, if any, |
| 255 | * and increments its reference count. The COMEDI device is prevented from |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 256 | * being freed until a matching call is made to comedi_dev_put(). |
| 257 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 258 | * Return: A pointer to the COMEDI device if it exists, with its usage |
| 259 | * reference incremented. Return NULL if no COMEDI device exists with the |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 260 | * specified minor device number. |
| 261 | */ |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 262 | struct comedi_device *comedi_dev_get_from_minor(unsigned int minor) |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 263 | { |
| 264 | if (minor < COMEDI_NUM_BOARD_MINORS) |
| 265 | return comedi_dev_get_from_board_minor(minor); |
Kinka Huang | cb3aada | 2014-07-15 23:11:02 +0800 | [diff] [blame] | 266 | |
| 267 | return comedi_dev_get_from_subdevice_minor(minor); |
Ian Abbott | b449c1c | 2013-11-08 15:03:33 +0000 | [diff] [blame] | 268 | } |
| 269 | EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); |
| 270 | |
H Hartley Sweeten | 43bd33f | 2012-12-19 15:33:29 -0700 | [diff] [blame] | 271 | static struct comedi_subdevice * |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 272 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
H Hartley Sweeten | 43bd33f | 2012-12-19 15:33:29 -0700 | [diff] [blame] | 273 | { |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 274 | struct comedi_subdevice *s; |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 275 | |
| 276 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
Ian Abbott | 63ab039 | 2013-11-08 15:03:42 +0000 | [diff] [blame] | 277 | s = comedi_subdevice_from_minor(dev, minor); |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 278 | if (!s || (s->subdev_flags & SDF_CMD_READ)) |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 279 | return s; |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 280 | } |
| 281 | return dev->read_subdev; |
H Hartley Sweeten | 43bd33f | 2012-12-19 15:33:29 -0700 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | static struct comedi_subdevice * |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 285 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
H Hartley Sweeten | 43bd33f | 2012-12-19 15:33:29 -0700 | [diff] [blame] | 286 | { |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 287 | struct comedi_subdevice *s; |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 288 | |
| 289 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
Ian Abbott | 63ab039 | 2013-11-08 15:03:42 +0000 | [diff] [blame] | 290 | s = comedi_subdevice_from_minor(dev, minor); |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 291 | if (!s || (s->subdev_flags & SDF_CMD_WRITE)) |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 292 | return s; |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 293 | } |
| 294 | return dev->write_subdev; |
H Hartley Sweeten | 43bd33f | 2012-12-19 15:33:29 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 297 | static void comedi_file_reset(struct file *file) |
| 298 | { |
| 299 | struct comedi_file *cfp = file->private_data; |
| 300 | struct comedi_device *dev = cfp->dev; |
| 301 | struct comedi_subdevice *s, *read_s, *write_s; |
| 302 | unsigned int minor = iminor(file_inode(file)); |
| 303 | |
| 304 | read_s = dev->read_subdev; |
| 305 | write_s = dev->write_subdev; |
| 306 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
| 307 | s = comedi_subdevice_from_minor(dev, minor); |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 308 | if (!s || s->subdev_flags & SDF_CMD_READ) |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 309 | read_s = s; |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 310 | if (!s || s->subdev_flags & SDF_CMD_WRITE) |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 311 | write_s = s; |
| 312 | } |
| 313 | cfp->last_attached = dev->attached; |
| 314 | cfp->last_detach_count = dev->detach_count; |
Shyam Saini | 34d3473 | 2016-05-10 21:21:07 +0530 | [diff] [blame] | 315 | WRITE_ONCE(cfp->read_subdev, read_s); |
| 316 | WRITE_ONCE(cfp->write_subdev, write_s); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | static void comedi_file_check(struct file *file) |
| 320 | { |
| 321 | struct comedi_file *cfp = file->private_data; |
| 322 | struct comedi_device *dev = cfp->dev; |
| 323 | |
| 324 | if (cfp->last_attached != dev->attached || |
| 325 | cfp->last_detach_count != dev->detach_count) |
| 326 | comedi_file_reset(file); |
| 327 | } |
| 328 | |
| 329 | static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file) |
| 330 | { |
| 331 | struct comedi_file *cfp = file->private_data; |
| 332 | |
| 333 | comedi_file_check(file); |
Shyam Saini | 34d3473 | 2016-05-10 21:21:07 +0530 | [diff] [blame] | 334 | return READ_ONCE(cfp->read_subdev); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file) |
| 338 | { |
| 339 | struct comedi_file *cfp = file->private_data; |
| 340 | |
| 341 | comedi_file_check(file); |
Shyam Saini | 34d3473 | 2016-05-10 21:21:07 +0530 | [diff] [blame] | 342 | return READ_ONCE(cfp->write_subdev); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 343 | } |
| 344 | |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 345 | static int resize_async_buffer(struct comedi_device *dev, |
Ian Abbott | b2073dc | 2016-03-29 10:49:04 +0100 | [diff] [blame] | 346 | struct comedi_subdevice *s, |
| 347 | unsigned int new_size) |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 348 | { |
Ian Abbott | 482f0a2 | 2014-05-02 13:50:14 +0100 | [diff] [blame] | 349 | struct comedi_async *async = s->async; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 350 | int retval; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 351 | |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 352 | if (new_size > async->max_bufsize) |
| 353 | return -EPERM; |
| 354 | |
| 355 | if (s->busy) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 356 | dev_dbg(dev->class_dev, |
| 357 | "subdevice is busy, cannot resize buffer\n"); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 358 | return -EBUSY; |
| 359 | } |
Ian Abbott | d4526ab | 2014-05-06 13:12:11 +0100 | [diff] [blame] | 360 | if (comedi_buf_is_mmapped(s)) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 361 | dev_dbg(dev->class_dev, |
| 362 | "subdevice is mmapped, cannot resize buffer\n"); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 363 | return -EBUSY; |
| 364 | } |
| 365 | |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 366 | /* make sure buffer is an integral number of pages (we round up) */ |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 367 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
| 368 | |
| 369 | retval = comedi_buf_alloc(dev, s, new_size); |
| 370 | if (retval < 0) |
| 371 | return retval; |
| 372 | |
| 373 | if (s->buf_change) { |
H Hartley Sweeten | d546b89 | 2014-07-21 11:48:32 -0700 | [diff] [blame] | 374 | retval = s->buf_change(dev, s); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 375 | if (retval < 0) |
| 376 | return retval; |
| 377 | } |
| 378 | |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 379 | dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
| 380 | s->index, async->prealloc_bufsz); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | /* sysfs attribute files */ |
| 385 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 386 | static ssize_t max_read_buffer_kb_show(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 387 | struct device_attribute *attr, char *buf) |
| 388 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 389 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 390 | struct comedi_device *dev; |
| 391 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 392 | unsigned int size = 0; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 393 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 394 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 395 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 396 | return -ENODEV; |
| 397 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 398 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 399 | s = comedi_read_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 400 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
| 401 | size = s->async->max_bufsize / 1024; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 402 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 403 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 404 | comedi_dev_put(dev); |
Chase Southwood | ecd56ff | 2014-02-12 02:28:35 -0600 | [diff] [blame] | 405 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 406 | } |
| 407 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 408 | static ssize_t max_read_buffer_kb_store(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 409 | struct device_attribute *attr, |
| 410 | const char *buf, size_t count) |
| 411 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 412 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 413 | struct comedi_device *dev; |
| 414 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 415 | unsigned int size; |
| 416 | int err; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 417 | |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 418 | err = kstrtouint(buf, 10, &size); |
| 419 | if (err) |
| 420 | return err; |
| 421 | if (size > (UINT_MAX / 1024)) |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 422 | return -EINVAL; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 423 | size *= 1024; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 424 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 425 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 426 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 427 | return -ENODEV; |
| 428 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 429 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 430 | s = comedi_read_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 431 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
| 432 | s->async->max_bufsize = size; |
| 433 | else |
| 434 | err = -EINVAL; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 435 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 436 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 437 | comedi_dev_put(dev); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 438 | return err ? err : count; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 439 | } |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 440 | static DEVICE_ATTR_RW(max_read_buffer_kb); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 441 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 442 | static ssize_t read_buffer_kb_show(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 443 | struct device_attribute *attr, char *buf) |
| 444 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 445 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 446 | struct comedi_device *dev; |
| 447 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 448 | unsigned int size = 0; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 449 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 450 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 451 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 452 | return -ENODEV; |
| 453 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 454 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 455 | s = comedi_read_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 456 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
| 457 | size = s->async->prealloc_bufsz / 1024; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 458 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 459 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 460 | comedi_dev_put(dev); |
Chase Southwood | ecd56ff | 2014-02-12 02:28:35 -0600 | [diff] [blame] | 461 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 464 | static ssize_t read_buffer_kb_store(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 465 | struct device_attribute *attr, |
| 466 | const char *buf, size_t count) |
| 467 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 468 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 469 | struct comedi_device *dev; |
| 470 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 471 | unsigned int size; |
| 472 | int err; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 473 | |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 474 | err = kstrtouint(buf, 10, &size); |
| 475 | if (err) |
| 476 | return err; |
| 477 | if (size > (UINT_MAX / 1024)) |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 478 | return -EINVAL; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 479 | size *= 1024; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 480 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 481 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 482 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 483 | return -ENODEV; |
| 484 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 485 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 486 | s = comedi_read_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 487 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
Ian Abbott | 482f0a2 | 2014-05-02 13:50:14 +0100 | [diff] [blame] | 488 | err = resize_async_buffer(dev, s, size); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 489 | else |
| 490 | err = -EINVAL; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 491 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 492 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 493 | comedi_dev_put(dev); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 494 | return err ? err : count; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 495 | } |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 496 | static DEVICE_ATTR_RW(read_buffer_kb); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 497 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 498 | static ssize_t max_write_buffer_kb_show(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 499 | struct device_attribute *attr, |
| 500 | char *buf) |
| 501 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 502 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 503 | struct comedi_device *dev; |
| 504 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 505 | unsigned int size = 0; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 506 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 507 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 508 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 509 | return -ENODEV; |
| 510 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 511 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 512 | s = comedi_write_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 513 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
| 514 | size = s->async->max_bufsize / 1024; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 515 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 516 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 517 | comedi_dev_put(dev); |
Chase Southwood | ecd56ff | 2014-02-12 02:28:35 -0600 | [diff] [blame] | 518 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 519 | } |
| 520 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 521 | static ssize_t max_write_buffer_kb_store(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 522 | struct device_attribute *attr, |
| 523 | const char *buf, size_t count) |
| 524 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 525 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 526 | struct comedi_device *dev; |
| 527 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 528 | unsigned int size; |
| 529 | int err; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 530 | |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 531 | err = kstrtouint(buf, 10, &size); |
| 532 | if (err) |
| 533 | return err; |
| 534 | if (size > (UINT_MAX / 1024)) |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 535 | return -EINVAL; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 536 | size *= 1024; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 537 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 538 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 539 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 540 | return -ENODEV; |
| 541 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 542 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 543 | s = comedi_write_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 544 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
| 545 | s->async->max_bufsize = size; |
| 546 | else |
| 547 | err = -EINVAL; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 548 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 549 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 550 | comedi_dev_put(dev); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 551 | return err ? err : count; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 552 | } |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 553 | static DEVICE_ATTR_RW(max_write_buffer_kb); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 554 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 555 | static ssize_t write_buffer_kb_show(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 556 | struct device_attribute *attr, char *buf) |
| 557 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 558 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 559 | struct comedi_device *dev; |
| 560 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 561 | unsigned int size = 0; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 562 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 563 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 564 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 565 | return -ENODEV; |
| 566 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 567 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 568 | s = comedi_write_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 569 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
| 570 | size = s->async->prealloc_bufsz / 1024; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 571 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 572 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 573 | comedi_dev_put(dev); |
Chase Southwood | ecd56ff | 2014-02-12 02:28:35 -0600 | [diff] [blame] | 574 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 575 | } |
| 576 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 577 | static ssize_t write_buffer_kb_store(struct device *csdev, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 578 | struct device_attribute *attr, |
| 579 | const char *buf, size_t count) |
| 580 | { |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 581 | unsigned int minor = MINOR(csdev->devt); |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 582 | struct comedi_device *dev; |
| 583 | struct comedi_subdevice *s; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 584 | unsigned int size; |
| 585 | int err; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 586 | |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 587 | err = kstrtouint(buf, 10, &size); |
| 588 | if (err) |
| 589 | return err; |
| 590 | if (size > (UINT_MAX / 1024)) |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 591 | return -EINVAL; |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 592 | size *= 1024; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 593 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 594 | dev = comedi_dev_get_from_minor(minor); |
Ian Abbott | 5e04c25 | 2013-04-04 14:59:11 +0100 | [diff] [blame] | 595 | if (!dev) |
Ian Abbott | c88db46 | 2013-04-04 14:59:09 +0100 | [diff] [blame] | 596 | return -ENODEV; |
| 597 | |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 598 | mutex_lock(&dev->mutex); |
Ian Abbott | da56fdc | 2013-04-04 14:59:10 +0100 | [diff] [blame] | 599 | s = comedi_write_subdevice(dev, minor); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 600 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
Ian Abbott | 482f0a2 | 2014-05-02 13:50:14 +0100 | [diff] [blame] | 601 | err = resize_async_buffer(dev, s, size); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 602 | else |
| 603 | err = -EINVAL; |
Ian Abbott | 7f4656c | 2013-04-04 14:59:08 +0100 | [diff] [blame] | 604 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 605 | |
Ian Abbott | be535c9 | 2013-11-08 15:03:37 +0000 | [diff] [blame] | 606 | comedi_dev_put(dev); |
H Hartley Sweeten | 72fd9fa | 2012-06-05 10:18:02 -0700 | [diff] [blame] | 607 | return err ? err : count; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 608 | } |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 609 | static DEVICE_ATTR_RW(write_buffer_kb); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 610 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 611 | static struct attribute *comedi_dev_attrs[] = { |
| 612 | &dev_attr_max_read_buffer_kb.attr, |
| 613 | &dev_attr_read_buffer_kb.attr, |
| 614 | &dev_attr_max_write_buffer_kb.attr, |
| 615 | &dev_attr_write_buffer_kb.attr, |
| 616 | NULL, |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 617 | }; |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 618 | ATTRIBUTE_GROUPS(comedi_dev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 619 | |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 620 | static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s, |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 621 | unsigned int bits) |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 622 | { |
| 623 | s->runflags &= ~bits; |
| 624 | } |
| 625 | |
| 626 | static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 627 | unsigned int bits) |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 628 | { |
| 629 | s->runflags |= bits; |
| 630 | } |
| 631 | |
Ian Abbott | cc64ea4 | 2015-03-27 15:13:00 +0000 | [diff] [blame] | 632 | static void comedi_update_subdevice_runflags(struct comedi_subdevice *s, |
Ian Abbott | b2073dc | 2016-03-29 10:49:04 +0100 | [diff] [blame] | 633 | unsigned int mask, |
| 634 | unsigned int bits) |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 635 | { |
| 636 | unsigned long flags; |
| 637 | |
| 638 | spin_lock_irqsave(&s->spin_lock, flags); |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 639 | __comedi_clear_subdevice_runflags(s, mask); |
| 640 | __comedi_set_subdevice_runflags(s, bits & mask); |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 641 | spin_unlock_irqrestore(&s->spin_lock, flags); |
| 642 | } |
| 643 | |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 644 | static unsigned int __comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 645 | { |
| 646 | return s->runflags; |
| 647 | } |
| 648 | |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 649 | static unsigned int comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
H Hartley Sweeten | 7412071 | 2012-12-19 15:42:26 -0700 | [diff] [blame] | 650 | { |
| 651 | unsigned long flags; |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 652 | unsigned int runflags; |
H Hartley Sweeten | 7412071 | 2012-12-19 15:42:26 -0700 | [diff] [blame] | 653 | |
| 654 | spin_lock_irqsave(&s->spin_lock, flags); |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 655 | runflags = __comedi_get_subdevice_runflags(s); |
H Hartley Sweeten | 7412071 | 2012-12-19 15:42:26 -0700 | [diff] [blame] | 656 | spin_unlock_irqrestore(&s->spin_lock, flags); |
| 657 | return runflags; |
| 658 | } |
H Hartley Sweeten | 7412071 | 2012-12-19 15:42:26 -0700 | [diff] [blame] | 659 | |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 660 | static bool comedi_is_runflags_running(unsigned int runflags) |
Ian Abbott | b183a83 | 2015-03-27 15:13:01 +0000 | [diff] [blame] | 661 | { |
| 662 | return runflags & COMEDI_SRF_RUNNING; |
| 663 | } |
| 664 | |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 665 | static bool comedi_is_runflags_in_error(unsigned int runflags) |
Ian Abbott | b183a83 | 2015-03-27 15:13:01 +0000 | [diff] [blame] | 666 | { |
| 667 | return runflags & COMEDI_SRF_ERROR; |
| 668 | } |
| 669 | |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 670 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 671 | * comedi_is_subdevice_running() - Check if async command running on subdevice |
| 672 | * @s: COMEDI subdevice. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 673 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 674 | * Return: %true if an asynchronous COMEDI command is active on the |
| 675 | * subdevice, else %false. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 676 | */ |
H Hartley Sweeten | e0dac31 | 2012-12-19 15:42:47 -0700 | [diff] [blame] | 677 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
| 678 | { |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 679 | unsigned int runflags = comedi_get_subdevice_runflags(s); |
H Hartley Sweeten | e0dac31 | 2012-12-19 15:42:47 -0700 | [diff] [blame] | 680 | |
Ian Abbott | b183a83 | 2015-03-27 15:13:01 +0000 | [diff] [blame] | 681 | return comedi_is_runflags_running(runflags); |
H Hartley Sweeten | e0dac31 | 2012-12-19 15:42:47 -0700 | [diff] [blame] | 682 | } |
| 683 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); |
| 684 | |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 685 | static bool __comedi_is_subdevice_running(struct comedi_subdevice *s) |
| 686 | { |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 687 | unsigned int runflags = __comedi_get_subdevice_runflags(s); |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 688 | |
| 689 | return comedi_is_runflags_running(runflags); |
| 690 | } |
| 691 | |
Ian Abbott | 8fc369a | 2015-04-21 13:18:10 +0100 | [diff] [blame] | 692 | bool comedi_can_auto_free_spriv(struct comedi_subdevice *s) |
| 693 | { |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 694 | unsigned int runflags = __comedi_get_subdevice_runflags(s); |
Ian Abbott | 8fc369a | 2015-04-21 13:18:10 +0100 | [diff] [blame] | 695 | |
| 696 | return runflags & COMEDI_SRF_FREE_SPRIV; |
| 697 | } |
| 698 | |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 699 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 700 | * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable |
| 701 | * @s: COMEDI subdevice. |
Ian Abbott | 8fc369a | 2015-04-21 13:18:10 +0100 | [diff] [blame] | 702 | * |
| 703 | * Mark the subdevice as having a pointer to private data that can be |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 704 | * automatically freed when the COMEDI device is detached from the low-level |
| 705 | * driver. |
Ian Abbott | 8fc369a | 2015-04-21 13:18:10 +0100 | [diff] [blame] | 706 | */ |
| 707 | void comedi_set_spriv_auto_free(struct comedi_subdevice *s) |
| 708 | { |
| 709 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV); |
| 710 | } |
| 711 | EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free); |
| 712 | |
| 713 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 714 | * comedi_alloc_spriv - Allocate memory for the subdevice private data |
| 715 | * @s: COMEDI subdevice. |
| 716 | * @size: Size of the memory to allocate. |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 717 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 718 | * Allocate memory for the subdevice private data and point @s->private |
| 719 | * to it. The memory will be freed automatically when the COMEDI device |
| 720 | * is detached from the low-level driver. |
| 721 | * |
| 722 | * Return: A pointer to the allocated memory @s->private on success. |
| 723 | * Return NULL on failure. |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 724 | */ |
H Hartley Sweeten | 0480bcb | 2013-06-19 15:24:36 -0700 | [diff] [blame] | 725 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 726 | { |
H Hartley Sweeten | 0480bcb | 2013-06-19 15:24:36 -0700 | [diff] [blame] | 727 | s->private = kzalloc(size, GFP_KERNEL); |
| 728 | if (s->private) |
Ian Abbott | 8fc369a | 2015-04-21 13:18:10 +0100 | [diff] [blame] | 729 | comedi_set_spriv_auto_free(s); |
H Hartley Sweeten | 0480bcb | 2013-06-19 15:24:36 -0700 | [diff] [blame] | 730 | return s->private; |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 731 | } |
H Hartley Sweeten | 0480bcb | 2013-06-19 15:24:36 -0700 | [diff] [blame] | 732 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 733 | |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 734 | /* |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 735 | * This function restores a subdevice to an idle state. |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 736 | */ |
| 737 | static void do_become_nonbusy(struct comedi_device *dev, |
| 738 | struct comedi_subdevice *s) |
| 739 | { |
| 740 | struct comedi_async *async = s->async; |
| 741 | |
Ian Abbott | cc64ea4 | 2015-03-27 15:13:00 +0000 | [diff] [blame] | 742 | comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 743 | if (async) { |
Ian Abbott | fcc18a9 | 2014-05-06 13:12:10 +0100 | [diff] [blame] | 744 | comedi_buf_reset(s); |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 745 | async->inttrig = NULL; |
| 746 | kfree(async->cmd.chanlist); |
| 747 | async->cmd.chanlist = NULL; |
Ian Abbott | 8da8c86 | 2013-11-08 15:03:27 +0000 | [diff] [blame] | 748 | s->busy = NULL; |
Ian Abbott | 258c1dd | 2015-03-27 15:13:03 +0000 | [diff] [blame] | 749 | wake_up_interruptible_all(&async->wait_head); |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 750 | } else { |
| 751 | dev_err(dev->class_dev, |
| 752 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); |
Ian Abbott | 8da8c86 | 2013-11-08 15:03:27 +0000 | [diff] [blame] | 753 | s->busy = NULL; |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 754 | } |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 755 | } |
| 756 | |
| 757 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
| 758 | { |
| 759 | int ret = 0; |
| 760 | |
H Hartley Sweeten | f012463 | 2012-12-19 15:43:18 -0700 | [diff] [blame] | 761 | if (comedi_is_subdevice_running(s) && s->cancel) |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 762 | ret = s->cancel(dev, s); |
| 763 | |
| 764 | do_become_nonbusy(dev, s); |
| 765 | |
| 766 | return ret; |
| 767 | } |
| 768 | |
Ian Abbott | d19db51 | 2013-11-08 15:03:28 +0000 | [diff] [blame] | 769 | void comedi_device_cancel_all(struct comedi_device *dev) |
| 770 | { |
| 771 | struct comedi_subdevice *s; |
| 772 | int i; |
| 773 | |
| 774 | if (!dev->attached) |
| 775 | return; |
| 776 | |
| 777 | for (i = 0; i < dev->n_subdevices; i++) { |
| 778 | s = &dev->subdevices[i]; |
| 779 | if (s->async) |
| 780 | do_cancel(dev, s); |
| 781 | } |
| 782 | } |
| 783 | |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 784 | static int is_device_busy(struct comedi_device *dev) |
| 785 | { |
| 786 | struct comedi_subdevice *s; |
| 787 | int i; |
| 788 | |
| 789 | if (!dev->attached) |
| 790 | return 0; |
| 791 | |
| 792 | for (i = 0; i < dev->n_subdevices; i++) { |
| 793 | s = &dev->subdevices[i]; |
| 794 | if (s->busy) |
| 795 | return 1; |
Ian Abbott | d4526ab | 2014-05-06 13:12:11 +0100 | [diff] [blame] | 796 | if (s->async && comedi_buf_is_mmapped(s)) |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 797 | return 1; |
| 798 | } |
| 799 | |
| 800 | return 0; |
| 801 | } |
| 802 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 803 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 804 | * COMEDI_DEVCONFIG ioctl |
| 805 | * attaches (and configures) or detaches a legacy device |
| 806 | * |
| 807 | * arg: |
| 808 | * pointer to comedi_devconfig structure (NULL if detaching) |
| 809 | * |
| 810 | * reads: |
| 811 | * comedi_devconfig structure (if attaching) |
| 812 | * |
| 813 | * writes: |
| 814 | * nothing |
| 815 | */ |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 816 | static int do_devconfig_ioctl(struct comedi_device *dev, |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 817 | struct comedi_devconfig __user *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 818 | { |
Bill Pemberton | 0707bb0 | 2009-03-16 22:06:20 -0400 | [diff] [blame] | 819 | struct comedi_devconfig it; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 820 | |
| 821 | if (!capable(CAP_SYS_ADMIN)) |
| 822 | return -EPERM; |
| 823 | |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 824 | if (!arg) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 825 | if (is_device_busy(dev)) |
| 826 | return -EBUSY; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 827 | if (dev->attached) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 828 | struct module *driver_module = dev->driver->module; |
Raghavendra Ganiga | 4bac39f | 2014-05-01 13:53:12 +0530 | [diff] [blame] | 829 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 830 | comedi_device_detach(dev); |
| 831 | module_put(driver_module); |
| 832 | } |
| 833 | return 0; |
| 834 | } |
| 835 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 836 | if (copy_from_user(&it, arg, sizeof(it))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 837 | return -EFAULT; |
| 838 | |
| 839 | it.board_name[COMEDI_NAMELEN - 1] = 0; |
| 840 | |
H Hartley Sweeten | d184313 | 2013-01-09 09:46:10 -0700 | [diff] [blame] | 841 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
| 842 | dev_warn(dev->class_dev, |
| 843 | "comedi_config --init_data is deprecated\n"); |
| 844 | return -EINVAL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 845 | } |
| 846 | |
Ian Abbott | 8ab4ed6 | 2013-04-04 14:58:54 +0100 | [diff] [blame] | 847 | if (dev->minor >= comedi_num_legacy_minors) |
| 848 | /* don't re-use dynamically allocated comedi devices */ |
| 849 | return -EBUSY; |
| 850 | |
Ian Abbott | b2a644b | 2013-04-04 14:58:56 +0100 | [diff] [blame] | 851 | /* This increments the driver module count on success. */ |
| 852 | return comedi_device_attach(dev, &it); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 853 | } |
| 854 | |
| 855 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 856 | * COMEDI_BUFCONFIG ioctl |
| 857 | * buffer configuration |
| 858 | * |
| 859 | * arg: |
| 860 | * pointer to comedi_bufconfig structure |
| 861 | * |
| 862 | * reads: |
| 863 | * comedi_bufconfig structure |
| 864 | * |
| 865 | * writes: |
| 866 | * modified comedi_bufconfig structure |
| 867 | */ |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 868 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
| 869 | struct comedi_bufconfig __user *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 870 | { |
Bill Pemberton | be6aba4 | 2009-03-16 22:06:37 -0400 | [diff] [blame] | 871 | struct comedi_bufconfig bc; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 872 | struct comedi_async *async; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 873 | struct comedi_subdevice *s; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 874 | int retval = 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 875 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 876 | if (copy_from_user(&bc, arg, sizeof(bc))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 877 | return -EFAULT; |
| 878 | |
Güngör Erseymen | 11f80dd | 2013-06-07 21:29:49 +0300 | [diff] [blame] | 879 | if (bc.subdevice >= dev->n_subdevices) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 880 | return -EINVAL; |
| 881 | |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 882 | s = &dev->subdevices[bc.subdevice]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 883 | async = s->async; |
| 884 | |
| 885 | if (!async) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 886 | dev_dbg(dev->class_dev, |
| 887 | "subdevice does not have async capability\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 888 | bc.size = 0; |
| 889 | bc.maximum_size = 0; |
| 890 | goto copyback; |
| 891 | } |
| 892 | |
| 893 | if (bc.maximum_size) { |
| 894 | if (!capable(CAP_SYS_ADMIN)) |
| 895 | return -EPERM; |
| 896 | |
| 897 | async->max_bufsize = bc.maximum_size; |
| 898 | } |
| 899 | |
| 900 | if (bc.size) { |
Ian Abbott | 482f0a2 | 2014-05-02 13:50:14 +0100 | [diff] [blame] | 901 | retval = resize_async_buffer(dev, s, bc.size); |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 902 | if (retval < 0) |
| 903 | return retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 904 | } |
| 905 | |
| 906 | bc.size = async->prealloc_bufsz; |
| 907 | bc.maximum_size = async->max_bufsize; |
| 908 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 909 | copyback: |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 910 | if (copy_to_user(arg, &bc, sizeof(bc))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 911 | return -EFAULT; |
| 912 | |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 917 | * COMEDI_DEVINFO ioctl |
| 918 | * device info |
| 919 | * |
| 920 | * arg: |
| 921 | * pointer to comedi_devinfo structure |
| 922 | * |
| 923 | * reads: |
| 924 | * nothing |
| 925 | * |
| 926 | * writes: |
| 927 | * comedi_devinfo structure |
| 928 | */ |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 929 | static int do_devinfo_ioctl(struct comedi_device *dev, |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 930 | struct comedi_devinfo __user *arg, |
| 931 | struct file *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 932 | { |
H Hartley Sweeten | 0e70092 | 2012-12-19 15:39:18 -0700 | [diff] [blame] | 933 | struct comedi_subdevice *s; |
| 934 | struct comedi_devinfo devinfo; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 935 | |
| 936 | memset(&devinfo, 0, sizeof(devinfo)); |
| 937 | |
| 938 | /* fill devinfo structure */ |
| 939 | devinfo.version_code = COMEDI_VERSION_CODE; |
| 940 | devinfo.n_subdevs = dev->n_subdevices; |
Vasiliy Kulikov | 819cbb1 | 2011-06-26 12:56:22 +0400 | [diff] [blame] | 941 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
| 942 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 943 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 944 | s = comedi_file_read_subdevice(file); |
H Hartley Sweeten | 0e70092 | 2012-12-19 15:39:18 -0700 | [diff] [blame] | 945 | if (s) |
H Hartley Sweeten | 90a35c1 | 2012-12-19 17:27:02 -0700 | [diff] [blame] | 946 | devinfo.read_subdevice = s->index; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 947 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 948 | devinfo.read_subdevice = -1; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 949 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 950 | s = comedi_file_write_subdevice(file); |
H Hartley Sweeten | 0e70092 | 2012-12-19 15:39:18 -0700 | [diff] [blame] | 951 | if (s) |
H Hartley Sweeten | 90a35c1 | 2012-12-19 17:27:02 -0700 | [diff] [blame] | 952 | devinfo.write_subdevice = s->index; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 953 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 954 | devinfo.write_subdevice = -1; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 955 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 956 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 957 | return -EFAULT; |
| 958 | |
| 959 | return 0; |
| 960 | } |
| 961 | |
| 962 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 963 | * COMEDI_SUBDINFO ioctl |
| 964 | * subdevices info |
| 965 | * |
| 966 | * arg: |
| 967 | * pointer to array of comedi_subdinfo structures |
| 968 | * |
| 969 | * reads: |
| 970 | * nothing |
| 971 | * |
| 972 | * writes: |
| 973 | * array of comedi_subdinfo structures |
| 974 | */ |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 975 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 976 | struct comedi_subdinfo __user *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 977 | { |
| 978 | int ret, i; |
Bill Pemberton | bd52efb | 2009-03-16 22:06:09 -0400 | [diff] [blame] | 979 | struct comedi_subdinfo *tmp, *us; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 980 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 981 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 982 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 983 | if (!tmp) |
| 984 | return -ENOMEM; |
| 985 | |
| 986 | /* fill subdinfo structs */ |
| 987 | for (i = 0; i < dev->n_subdevices; i++) { |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 988 | s = &dev->subdevices[i]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 989 | us = tmp + i; |
| 990 | |
| 991 | us->type = s->type; |
| 992 | us->n_chan = s->n_chan; |
| 993 | us->subd_flags = s->subdev_flags; |
H Hartley Sweeten | f012463 | 2012-12-19 15:43:18 -0700 | [diff] [blame] | 994 | if (comedi_is_subdevice_running(s)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 995 | us->subd_flags |= SDF_RUNNING; |
| 996 | #define TIMER_nanosec 5 /* backwards compatibility */ |
| 997 | us->timer_type = TIMER_nanosec; |
| 998 | us->len_chanlist = s->len_chanlist; |
| 999 | us->maxdata = s->maxdata; |
| 1000 | if (s->range_table) { |
| 1001 | us->range_type = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1002 | (i << 24) | (0 << 16) | (s->range_table->length); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1003 | } else { |
| 1004 | us->range_type = 0; /* XXX */ |
| 1005 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1006 | |
| 1007 | if (s->busy) |
| 1008 | us->subd_flags |= SDF_BUSY; |
| 1009 | if (s->busy == file) |
| 1010 | us->subd_flags |= SDF_BUSY_OWNER; |
| 1011 | if (s->lock) |
| 1012 | us->subd_flags |= SDF_LOCKED; |
| 1013 | if (s->lock == file) |
| 1014 | us->subd_flags |= SDF_LOCK_OWNER; |
| 1015 | if (!s->maxdata && s->maxdata_list) |
| 1016 | us->subd_flags |= SDF_MAXDATA; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1017 | if (s->range_table_list) |
| 1018 | us->subd_flags |= SDF_RANGETYPE; |
| 1019 | if (s->do_cmd) |
| 1020 | us->subd_flags |= SDF_CMD; |
| 1021 | |
| 1022 | if (s->insn_bits != &insn_inval) |
| 1023 | us->insn_bits_support = COMEDI_SUPPORTED; |
| 1024 | else |
| 1025 | us->insn_bits_support = COMEDI_UNSUPPORTED; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1026 | } |
| 1027 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1028 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1029 | |
| 1030 | kfree(tmp); |
| 1031 | |
| 1032 | return ret ? -EFAULT : 0; |
| 1033 | } |
| 1034 | |
| 1035 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1036 | * COMEDI_CHANINFO ioctl |
| 1037 | * subdevice channel info |
| 1038 | * |
| 1039 | * arg: |
| 1040 | * pointer to comedi_chaninfo structure |
| 1041 | * |
| 1042 | * reads: |
| 1043 | * comedi_chaninfo structure |
| 1044 | * |
| 1045 | * writes: |
| 1046 | * array of maxdata values to chaninfo->maxdata_list if requested |
| 1047 | * array of range table lengths to chaninfo->range_table_list if requested |
| 1048 | */ |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1049 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 1050 | struct comedi_chaninfo __user *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1051 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1052 | struct comedi_subdevice *s; |
Bill Pemberton | a18b416 | 2009-03-16 22:06:04 -0400 | [diff] [blame] | 1053 | struct comedi_chaninfo it; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1054 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1055 | if (copy_from_user(&it, arg, sizeof(it))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1056 | return -EFAULT; |
| 1057 | |
| 1058 | if (it.subdev >= dev->n_subdevices) |
| 1059 | return -EINVAL; |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1060 | s = &dev->subdevices[it.subdev]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1061 | |
| 1062 | if (it.maxdata_list) { |
| 1063 | if (s->maxdata || !s->maxdata_list) |
| 1064 | return -EINVAL; |
| 1065 | if (copy_to_user(it.maxdata_list, s->maxdata_list, |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 1066 | s->n_chan * sizeof(unsigned int))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1067 | return -EFAULT; |
| 1068 | } |
| 1069 | |
Ian Abbott | 64d9b1d | 2013-10-07 16:50:05 +0100 | [diff] [blame] | 1070 | if (it.flaglist) |
| 1071 | return -EINVAL; /* flaglist not supported */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1072 | |
| 1073 | if (it.rangelist) { |
| 1074 | int i; |
| 1075 | |
| 1076 | if (!s->range_table_list) |
| 1077 | return -EINVAL; |
| 1078 | for (i = 0; i < s->n_chan; i++) { |
| 1079 | int x; |
| 1080 | |
| 1081 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1082 | (s->range_table_list[i]->length); |
Vasiliy Kulikov | 81604d4 | 2010-09-05 22:32:33 +0400 | [diff] [blame] | 1083 | if (put_user(x, it.rangelist + i)) |
| 1084 | return -EFAULT; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1085 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1086 | } |
| 1087 | |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1091 | /* |
| 1092 | * COMEDI_BUFINFO ioctl |
| 1093 | * buffer information |
| 1094 | * |
| 1095 | * arg: |
| 1096 | * pointer to comedi_bufinfo structure |
| 1097 | * |
| 1098 | * reads: |
| 1099 | * comedi_bufinfo structure |
| 1100 | * |
| 1101 | * writes: |
| 1102 | * modified comedi_bufinfo structure |
| 1103 | */ |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 1104 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
Ian Abbott | 53fa827 | 2010-05-19 18:09:50 +0100 | [diff] [blame] | 1105 | struct comedi_bufinfo __user *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1106 | { |
Bill Pemberton | 9aa5339 | 2009-03-16 22:06:42 -0400 | [diff] [blame] | 1107 | struct comedi_bufinfo bi; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1108 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1109 | struct comedi_async *async; |
Ian Abbott | 36a5117 | 2016-02-19 16:13:56 +0000 | [diff] [blame] | 1110 | unsigned int runflags; |
| 1111 | int retval = 0; |
Ian Abbott | 0657856 | 2016-02-19 16:13:52 +0000 | [diff] [blame] | 1112 | bool become_nonbusy = false; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1113 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1114 | if (copy_from_user(&bi, arg, sizeof(bi))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1115 | return -EFAULT; |
| 1116 | |
Güngör Erseymen | 7b1a5e2 | 2013-06-07 21:29:50 +0300 | [diff] [blame] | 1117 | if (bi.subdevice >= dev->n_subdevices) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1118 | return -EINVAL; |
| 1119 | |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1120 | s = &dev->subdevices[bi.subdevice]; |
Ian Abbott | 53fa827 | 2010-05-19 18:09:50 +0100 | [diff] [blame] | 1121 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1122 | async = s->async; |
| 1123 | |
Ian Abbott | 57c563b | 2016-02-19 16:13:54 +0000 | [diff] [blame] | 1124 | if (!async || s->busy != file) |
| 1125 | return -EINVAL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1126 | |
Ian Abbott | be611a1 | 2016-02-19 16:13:57 +0000 | [diff] [blame] | 1127 | runflags = comedi_get_subdevice_runflags(s); |
Ian Abbott | 66c3650 | 2016-02-19 16:13:51 +0000 | [diff] [blame] | 1128 | if (!(async->cmd.flags & CMDF_WRITE)) { |
| 1129 | /* command was set up in "read" direction */ |
| 1130 | if (bi.bytes_read) { |
| 1131 | comedi_buf_read_alloc(s, bi.bytes_read); |
| 1132 | bi.bytes_read = comedi_buf_read_free(s, bi.bytes_read); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1133 | } |
Ian Abbott | 36a5117 | 2016-02-19 16:13:56 +0000 | [diff] [blame] | 1134 | /* |
| 1135 | * If nothing left to read, and command has stopped, and |
| 1136 | * {"read" position not updated or command stopped normally}, |
| 1137 | * then become non-busy. |
| 1138 | */ |
Ian Abbott | 36a5117 | 2016-02-19 16:13:56 +0000 | [diff] [blame] | 1139 | if (comedi_buf_read_n_available(s) == 0 && |
| 1140 | !comedi_is_runflags_running(runflags) && |
| 1141 | (bi.bytes_read == 0 || |
| 1142 | !comedi_is_runflags_in_error(runflags))) { |
Ian Abbott | f3aa8c0 | 2016-02-19 16:13:55 +0000 | [diff] [blame] | 1143 | become_nonbusy = true; |
Ian Abbott | 36a5117 | 2016-02-19 16:13:56 +0000 | [diff] [blame] | 1144 | if (comedi_is_runflags_in_error(runflags)) |
| 1145 | retval = -EPIPE; |
| 1146 | } |
Ian Abbott | 66c3650 | 2016-02-19 16:13:51 +0000 | [diff] [blame] | 1147 | bi.bytes_written = 0; |
| 1148 | } else { |
| 1149 | /* command was set up in "write" direction */ |
Ian Abbott | be611a1 | 2016-02-19 16:13:57 +0000 | [diff] [blame] | 1150 | if (!comedi_is_runflags_running(runflags)) { |
Ian Abbott | bb0c6bf | 2016-02-19 16:13:53 +0000 | [diff] [blame] | 1151 | bi.bytes_written = 0; |
Ian Abbott | be611a1 | 2016-02-19 16:13:57 +0000 | [diff] [blame] | 1152 | become_nonbusy = true; |
| 1153 | if (comedi_is_runflags_in_error(runflags)) |
| 1154 | retval = -EPIPE; |
| 1155 | } else if (bi.bytes_written) { |
Ian Abbott | 66c3650 | 2016-02-19 16:13:51 +0000 | [diff] [blame] | 1156 | comedi_buf_write_alloc(s, bi.bytes_written); |
| 1157 | bi.bytes_written = |
| 1158 | comedi_buf_write_free(s, bi.bytes_written); |
| 1159 | } |
| 1160 | bi.bytes_read = 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1161 | } |
| 1162 | |
| 1163 | bi.buf_write_count = async->buf_write_count; |
| 1164 | bi.buf_write_ptr = async->buf_write_ptr; |
| 1165 | bi.buf_read_count = async->buf_read_count; |
| 1166 | bi.buf_read_ptr = async->buf_read_ptr; |
| 1167 | |
Ian Abbott | 0657856 | 2016-02-19 16:13:52 +0000 | [diff] [blame] | 1168 | if (become_nonbusy) |
| 1169 | do_become_nonbusy(dev, s); |
| 1170 | |
Ian Abbott | 36a5117 | 2016-02-19 16:13:56 +0000 | [diff] [blame] | 1171 | if (retval) |
| 1172 | return retval; |
| 1173 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1174 | if (copy_to_user(arg, &bi, sizeof(bi))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1175 | return -EFAULT; |
| 1176 | |
| 1177 | return 0; |
| 1178 | } |
| 1179 | |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1180 | static int check_insn_config_length(struct comedi_insn *insn, |
| 1181 | unsigned int *data) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1182 | { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1183 | if (insn->n < 1) |
| 1184 | return -EINVAL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1185 | |
| 1186 | switch (data[0]) { |
| 1187 | case INSN_CONFIG_DIO_OUTPUT: |
| 1188 | case INSN_CONFIG_DIO_INPUT: |
| 1189 | case INSN_CONFIG_DISARM: |
| 1190 | case INSN_CONFIG_RESET: |
| 1191 | if (insn->n == 1) |
| 1192 | return 0; |
| 1193 | break; |
| 1194 | case INSN_CONFIG_ARM: |
| 1195 | case INSN_CONFIG_DIO_QUERY: |
| 1196 | case INSN_CONFIG_BLOCK_SIZE: |
| 1197 | case INSN_CONFIG_FILTER: |
| 1198 | case INSN_CONFIG_SERIAL_CLOCK: |
| 1199 | case INSN_CONFIG_BIDIRECTIONAL_DATA: |
| 1200 | case INSN_CONFIG_ALT_SOURCE: |
| 1201 | case INSN_CONFIG_SET_COUNTER_MODE: |
| 1202 | case INSN_CONFIG_8254_READ_STATUS: |
| 1203 | case INSN_CONFIG_SET_ROUTING: |
| 1204 | case INSN_CONFIG_GET_ROUTING: |
| 1205 | case INSN_CONFIG_GET_PWM_STATUS: |
| 1206 | case INSN_CONFIG_PWM_SET_PERIOD: |
| 1207 | case INSN_CONFIG_PWM_GET_PERIOD: |
| 1208 | if (insn->n == 2) |
| 1209 | return 0; |
| 1210 | break; |
| 1211 | case INSN_CONFIG_SET_GATE_SRC: |
| 1212 | case INSN_CONFIG_GET_GATE_SRC: |
| 1213 | case INSN_CONFIG_SET_CLOCK_SRC: |
| 1214 | case INSN_CONFIG_GET_CLOCK_SRC: |
| 1215 | case INSN_CONFIG_SET_OTHER_SRC: |
| 1216 | case INSN_CONFIG_GET_COUNTER_STATUS: |
| 1217 | case INSN_CONFIG_PWM_SET_H_BRIDGE: |
| 1218 | case INSN_CONFIG_PWM_GET_H_BRIDGE: |
| 1219 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: |
| 1220 | if (insn->n == 3) |
| 1221 | return 0; |
| 1222 | break; |
| 1223 | case INSN_CONFIG_PWM_OUTPUT: |
| 1224 | case INSN_CONFIG_ANALOG_TRIG: |
| 1225 | if (insn->n == 5) |
| 1226 | return 0; |
| 1227 | break; |
Ian Abbott | b0a2b6d | 2012-11-14 11:22:57 +0000 | [diff] [blame] | 1228 | case INSN_CONFIG_DIGITAL_TRIG: |
| 1229 | if (insn->n == 6) |
| 1230 | return 0; |
| 1231 | break; |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 1232 | /* |
| 1233 | * by default we allow the insn since we don't have checks for |
| 1234 | * all possible cases yet |
| 1235 | */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1236 | default: |
H Hartley Sweeten | c2ad078 | 2014-07-17 12:27:32 -0700 | [diff] [blame] | 1237 | pr_warn("No check for data length of config insn id %i is implemented\n", |
Ian Abbott | 4f870fe | 2012-08-16 14:38:05 +0100 | [diff] [blame] | 1238 | data[0]); |
H Hartley Sweeten | c2ad078 | 2014-07-17 12:27:32 -0700 | [diff] [blame] | 1239 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
| 1240 | pr_warn("Assuming n=%i is correct\n", insn->n); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1241 | return 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1242 | } |
| 1243 | return -EINVAL; |
| 1244 | } |
| 1245 | |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1246 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
| 1247 | unsigned int *data, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1248 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1249 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1250 | int ret = 0; |
| 1251 | int i; |
| 1252 | |
| 1253 | if (insn->insn & INSN_MASK_SPECIAL) { |
| 1254 | /* a non-subdevice instruction */ |
| 1255 | |
| 1256 | switch (insn->insn) { |
| 1257 | case INSN_GTOD: |
| 1258 | { |
Arnd Bergmann | 70db384 | 2016-06-17 21:56:15 +0200 | [diff] [blame] | 1259 | struct timespec64 tv; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1260 | |
| 1261 | if (insn->n != 2) { |
| 1262 | ret = -EINVAL; |
| 1263 | break; |
| 1264 | } |
| 1265 | |
Arnd Bergmann | 70db384 | 2016-06-17 21:56:15 +0200 | [diff] [blame] | 1266 | ktime_get_real_ts64(&tv); |
| 1267 | /* unsigned data safe until 2106 */ |
| 1268 | data[0] = (unsigned int)tv.tv_sec; |
| 1269 | data[1] = tv.tv_nsec / NSEC_PER_USEC; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1270 | ret = 2; |
| 1271 | |
| 1272 | break; |
| 1273 | } |
| 1274 | case INSN_WAIT: |
| 1275 | if (insn->n != 1 || data[0] >= 100000) { |
| 1276 | ret = -EINVAL; |
| 1277 | break; |
| 1278 | } |
| 1279 | udelay(data[0] / 1000); |
| 1280 | ret = 1; |
| 1281 | break; |
| 1282 | case INSN_INTTRIG: |
| 1283 | if (insn->n != 1) { |
| 1284 | ret = -EINVAL; |
| 1285 | break; |
| 1286 | } |
| 1287 | if (insn->subdev >= dev->n_subdevices) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1288 | dev_dbg(dev->class_dev, |
| 1289 | "%d not usable subdevice\n", |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1290 | insn->subdev); |
| 1291 | ret = -EINVAL; |
| 1292 | break; |
| 1293 | } |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1294 | s = &dev->subdevices[insn->subdev]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1295 | if (!s->async) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1296 | dev_dbg(dev->class_dev, "no async\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1297 | ret = -EINVAL; |
| 1298 | break; |
| 1299 | } |
| 1300 | if (!s->async->inttrig) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1301 | dev_dbg(dev->class_dev, "no inttrig\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1302 | ret = -EAGAIN; |
| 1303 | break; |
| 1304 | } |
Ian Abbott | 5d06e3d | 2012-09-18 19:46:58 +0100 | [diff] [blame] | 1305 | ret = s->async->inttrig(dev, s, data[0]); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1306 | if (ret >= 0) |
| 1307 | ret = 1; |
| 1308 | break; |
| 1309 | default: |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1310 | dev_dbg(dev->class_dev, "invalid insn\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1311 | ret = -EINVAL; |
| 1312 | break; |
| 1313 | } |
| 1314 | } else { |
| 1315 | /* a subdevice instruction */ |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 1316 | unsigned int maxdata; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1317 | |
| 1318 | if (insn->subdev >= dev->n_subdevices) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1319 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
| 1320 | insn->subdev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1321 | ret = -EINVAL; |
| 1322 | goto out; |
| 1323 | } |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1324 | s = &dev->subdevices[insn->subdev]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1325 | |
| 1326 | if (s->type == COMEDI_SUBD_UNUSED) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1327 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
| 1328 | insn->subdev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1329 | ret = -EIO; |
| 1330 | goto out; |
| 1331 | } |
| 1332 | |
| 1333 | /* are we locked? (ioctl lock) */ |
| 1334 | if (s->lock && s->lock != file) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1335 | dev_dbg(dev->class_dev, "device locked\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1336 | ret = -EACCES; |
| 1337 | goto out; |
| 1338 | } |
| 1339 | |
Greg Kroah-Hartman | 0fd0ca7 | 2010-05-01 12:33:17 -0700 | [diff] [blame] | 1340 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1341 | if (ret < 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1342 | ret = -EINVAL; |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1343 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1344 | goto out; |
| 1345 | } |
| 1346 | |
| 1347 | if (s->busy) { |
| 1348 | ret = -EBUSY; |
| 1349 | goto out; |
| 1350 | } |
| 1351 | /* This looks arbitrary. It is. */ |
Shraddha Barke | 30cc9bd | 2015-10-13 21:07:47 +0530 | [diff] [blame] | 1352 | s->busy = parse_insn; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1353 | switch (insn->insn) { |
| 1354 | case INSN_READ: |
| 1355 | ret = s->insn_read(dev, s, insn, data); |
H Hartley Sweeten | 22ca19d | 2014-02-10 11:49:45 -0700 | [diff] [blame] | 1356 | if (ret == -ETIMEDOUT) { |
| 1357 | dev_dbg(dev->class_dev, |
| 1358 | "subdevice %d read instruction timed out\n", |
| 1359 | s->index); |
| 1360 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1361 | break; |
| 1362 | case INSN_WRITE: |
| 1363 | maxdata = s->maxdata_list |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1364 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
| 1365 | : s->maxdata; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1366 | for (i = 0; i < insn->n; ++i) { |
| 1367 | if (data[i] > maxdata) { |
| 1368 | ret = -EINVAL; |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1369 | dev_dbg(dev->class_dev, |
| 1370 | "bad data value(s)\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1371 | break; |
| 1372 | } |
| 1373 | } |
H Hartley Sweeten | 22ca19d | 2014-02-10 11:49:45 -0700 | [diff] [blame] | 1374 | if (ret == 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1375 | ret = s->insn_write(dev, s, insn, data); |
H Hartley Sweeten | 22ca19d | 2014-02-10 11:49:45 -0700 | [diff] [blame] | 1376 | if (ret == -ETIMEDOUT) { |
| 1377 | dev_dbg(dev->class_dev, |
| 1378 | "subdevice %d write instruction timed out\n", |
| 1379 | s->index); |
| 1380 | } |
| 1381 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1382 | break; |
| 1383 | case INSN_BITS: |
| 1384 | if (insn->n != 2) { |
| 1385 | ret = -EINVAL; |
Ian Abbott | 2f644cc | 2011-01-18 17:44:33 +0000 | [diff] [blame] | 1386 | } else { |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 1387 | /* |
| 1388 | * Most drivers ignore the base channel in |
Ian Abbott | 2f644cc | 2011-01-18 17:44:33 +0000 | [diff] [blame] | 1389 | * insn->chanspec. Fix this here if |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 1390 | * the subdevice has <= 32 channels. |
| 1391 | */ |
H Hartley Sweeten | 36efbac | 2014-07-18 14:28:14 -0700 | [diff] [blame] | 1392 | unsigned int orig_mask = data[0]; |
| 1393 | unsigned int shift = 0; |
Ian Abbott | 2f644cc | 2011-01-18 17:44:33 +0000 | [diff] [blame] | 1394 | |
Ian Abbott | 2f644cc | 2011-01-18 17:44:33 +0000 | [diff] [blame] | 1395 | if (s->n_chan <= 32) { |
| 1396 | shift = CR_CHAN(insn->chanspec); |
| 1397 | if (shift > 0) { |
| 1398 | insn->chanspec = 0; |
| 1399 | data[0] <<= shift; |
| 1400 | data[1] <<= shift; |
| 1401 | } |
H Hartley Sweeten | 36efbac | 2014-07-18 14:28:14 -0700 | [diff] [blame] | 1402 | } |
Ian Abbott | 2f644cc | 2011-01-18 17:44:33 +0000 | [diff] [blame] | 1403 | ret = s->insn_bits(dev, s, insn, data); |
| 1404 | data[0] = orig_mask; |
| 1405 | if (shift > 0) |
| 1406 | data[1] >>= shift; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1407 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1408 | break; |
| 1409 | case INSN_CONFIG: |
| 1410 | ret = check_insn_config_length(insn, data); |
| 1411 | if (ret) |
| 1412 | break; |
| 1413 | ret = s->insn_config(dev, s, insn, data); |
| 1414 | break; |
| 1415 | default: |
| 1416 | ret = -EINVAL; |
| 1417 | break; |
| 1418 | } |
| 1419 | |
| 1420 | s->busy = NULL; |
| 1421 | } |
| 1422 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1423 | out: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1424 | return ret; |
| 1425 | } |
| 1426 | |
| 1427 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1428 | * COMEDI_INSNLIST ioctl |
| 1429 | * synchronous instruction list |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1430 | * |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1431 | * arg: |
| 1432 | * pointer to comedi_insnlist structure |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1433 | * |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1434 | * reads: |
| 1435 | * comedi_insnlist structure |
| 1436 | * array of comedi_insn structures from insnlist->insns pointer |
| 1437 | * data (for writes) from insns[].data pointers |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1438 | * |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1439 | * writes: |
| 1440 | * data (for reads) to insns[].data pointers |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1441 | */ |
| 1442 | /* arbitrary limits */ |
| 1443 | #define MAX_SAMPLES 256 |
| 1444 | static int do_insnlist_ioctl(struct comedi_device *dev, |
| 1445 | struct comedi_insnlist __user *arg, void *file) |
| 1446 | { |
| 1447 | struct comedi_insnlist insnlist; |
| 1448 | struct comedi_insn *insns = NULL; |
| 1449 | unsigned int *data = NULL; |
| 1450 | int i = 0; |
| 1451 | int ret = 0; |
| 1452 | |
| 1453 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) |
| 1454 | return -EFAULT; |
| 1455 | |
Wolfgang Ocker | f4a8f52 | 2014-06-02 22:48:06 +0200 | [diff] [blame] | 1456 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1457 | if (!data) { |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1458 | ret = -ENOMEM; |
| 1459 | goto error; |
| 1460 | } |
| 1461 | |
| 1462 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); |
| 1463 | if (!insns) { |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1464 | ret = -ENOMEM; |
| 1465 | goto error; |
| 1466 | } |
| 1467 | |
| 1468 | if (copy_from_user(insns, insnlist.insns, |
| 1469 | sizeof(*insns) * insnlist.n_insns)) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1470 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1471 | ret = -EFAULT; |
| 1472 | goto error; |
| 1473 | } |
| 1474 | |
| 1475 | for (i = 0; i < insnlist.n_insns; i++) { |
| 1476 | if (insns[i].n > MAX_SAMPLES) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1477 | dev_dbg(dev->class_dev, |
| 1478 | "number of samples too large\n"); |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1479 | ret = -EINVAL; |
| 1480 | goto error; |
| 1481 | } |
| 1482 | if (insns[i].insn & INSN_MASK_WRITE) { |
| 1483 | if (copy_from_user(data, insns[i].data, |
| 1484 | insns[i].n * sizeof(unsigned int))) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1485 | dev_dbg(dev->class_dev, |
| 1486 | "copy_from_user failed\n"); |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1487 | ret = -EFAULT; |
| 1488 | goto error; |
| 1489 | } |
| 1490 | } |
| 1491 | ret = parse_insn(dev, insns + i, data, file); |
| 1492 | if (ret < 0) |
| 1493 | goto error; |
| 1494 | if (insns[i].insn & INSN_MASK_READ) { |
| 1495 | if (copy_to_user(insns[i].data, data, |
| 1496 | insns[i].n * sizeof(unsigned int))) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1497 | dev_dbg(dev->class_dev, |
| 1498 | "copy_to_user failed\n"); |
H Hartley Sweeten | 5b6cbd8 | 2013-01-21 14:02:59 -0700 | [diff] [blame] | 1499 | ret = -EFAULT; |
| 1500 | goto error; |
| 1501 | } |
| 1502 | } |
| 1503 | if (need_resched()) |
| 1504 | schedule(); |
| 1505 | } |
| 1506 | |
| 1507 | error: |
| 1508 | kfree(insns); |
| 1509 | kfree(data); |
| 1510 | |
| 1511 | if (ret < 0) |
| 1512 | return ret; |
| 1513 | return i; |
| 1514 | } |
| 1515 | |
| 1516 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1517 | * COMEDI_INSN ioctl |
| 1518 | * synchronous instruction |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1519 | * |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1520 | * arg: |
| 1521 | * pointer to comedi_insn structure |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1522 | * |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1523 | * reads: |
| 1524 | * comedi_insn structure |
| 1525 | * data (for writes) from insn->data pointer |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1526 | * |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1527 | * writes: |
| 1528 | * data (for reads) to insn->data pointer |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1529 | */ |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 1530 | static int do_insn_ioctl(struct comedi_device *dev, |
| 1531 | struct comedi_insn __user *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1532 | { |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 1533 | struct comedi_insn insn; |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 1534 | unsigned int *data = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1535 | int ret = 0; |
| 1536 | |
Wolfgang Ocker | f4a8f52 | 2014-06-02 22:48:06 +0200 | [diff] [blame] | 1537 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1538 | if (!data) { |
| 1539 | ret = -ENOMEM; |
| 1540 | goto error; |
| 1541 | } |
| 1542 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1543 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1544 | ret = -EFAULT; |
| 1545 | goto error; |
| 1546 | } |
| 1547 | |
| 1548 | /* This is where the behavior of insn and insnlist deviate. */ |
| 1549 | if (insn.n > MAX_SAMPLES) |
| 1550 | insn.n = MAX_SAMPLES; |
| 1551 | if (insn.insn & INSN_MASK_WRITE) { |
Mark | 21fe2ee | 2010-05-13 17:44:39 +0800 | [diff] [blame] | 1552 | if (copy_from_user(data, |
| 1553 | insn.data, |
| 1554 | insn.n * sizeof(unsigned int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1555 | ret = -EFAULT; |
| 1556 | goto error; |
| 1557 | } |
| 1558 | } |
| 1559 | ret = parse_insn(dev, &insn, data, file); |
| 1560 | if (ret < 0) |
| 1561 | goto error; |
| 1562 | if (insn.insn & INSN_MASK_READ) { |
Mark | 21fe2ee | 2010-05-13 17:44:39 +0800 | [diff] [blame] | 1563 | if (copy_to_user(insn.data, |
| 1564 | data, |
| 1565 | insn.n * sizeof(unsigned int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1566 | ret = -EFAULT; |
| 1567 | goto error; |
| 1568 | } |
| 1569 | } |
| 1570 | ret = insn.n; |
| 1571 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1572 | error: |
| 1573 | kfree(data); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1574 | |
| 1575 | return ret; |
| 1576 | } |
| 1577 | |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1578 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
| 1579 | struct comedi_cmd __user *arg, |
| 1580 | struct comedi_cmd *cmd) |
| 1581 | { |
| 1582 | struct comedi_subdevice *s; |
| 1583 | |
| 1584 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
| 1585 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
| 1586 | return -EFAULT; |
| 1587 | } |
| 1588 | |
| 1589 | if (cmd->subdev >= dev->n_subdevices) { |
| 1590 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); |
| 1591 | return -ENODEV; |
| 1592 | } |
| 1593 | |
| 1594 | s = &dev->subdevices[cmd->subdev]; |
| 1595 | |
| 1596 | if (s->type == COMEDI_SUBD_UNUSED) { |
Yves Deweerdt | b2f4874 | 2014-03-31 22:55:39 +0200 | [diff] [blame] | 1597 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
| 1598 | cmd->subdev); |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1599 | return -EIO; |
| 1600 | } |
| 1601 | |
| 1602 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { |
| 1603 | dev_dbg(dev->class_dev, |
Yves Deweerdt | b2f4874 | 2014-03-31 22:55:39 +0200 | [diff] [blame] | 1604 | "subdevice %d does not support commands\n", |
| 1605 | cmd->subdev); |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1606 | return -EIO; |
| 1607 | } |
| 1608 | |
| 1609 | /* make sure channel/gain list isn't too long */ |
| 1610 | if (cmd->chanlist_len > s->len_chanlist) { |
| 1611 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", |
| 1612 | cmd->chanlist_len, s->len_chanlist); |
| 1613 | return -EINVAL; |
| 1614 | } |
| 1615 | |
Ian Abbott | 5d070cf | 2014-10-30 12:42:26 +0000 | [diff] [blame] | 1616 | /* |
| 1617 | * Set the CMDF_WRITE flag to the correct state if the subdevice |
| 1618 | * supports only "read" commands or only "write" commands. |
| 1619 | */ |
| 1620 | switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { |
| 1621 | case SDF_CMD_READ: |
| 1622 | cmd->flags &= ~CMDF_WRITE; |
| 1623 | break; |
| 1624 | case SDF_CMD_WRITE: |
| 1625 | cmd->flags |= CMDF_WRITE; |
| 1626 | break; |
| 1627 | default: |
| 1628 | break; |
| 1629 | } |
| 1630 | |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1631 | return 0; |
| 1632 | } |
| 1633 | |
H Hartley Sweeten | c6cd0ee | 2014-03-06 12:02:57 -0700 | [diff] [blame] | 1634 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
| 1635 | struct comedi_subdevice *s, |
| 1636 | unsigned int __user *user_chanlist, |
| 1637 | struct comedi_cmd *cmd) |
| 1638 | { |
| 1639 | unsigned int *chanlist; |
| 1640 | int ret; |
| 1641 | |
Ian Abbott | 238b5ad | 2014-10-20 15:10:40 +0100 | [diff] [blame] | 1642 | cmd->chanlist = NULL; |
H Hartley Sweeten | c6cd0ee | 2014-03-06 12:02:57 -0700 | [diff] [blame] | 1643 | chanlist = memdup_user(user_chanlist, |
| 1644 | cmd->chanlist_len * sizeof(unsigned int)); |
| 1645 | if (IS_ERR(chanlist)) |
| 1646 | return PTR_ERR(chanlist); |
| 1647 | |
| 1648 | /* make sure each element in channel/gain list is valid */ |
| 1649 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); |
| 1650 | if (ret < 0) { |
| 1651 | kfree(chanlist); |
| 1652 | return ret; |
| 1653 | } |
| 1654 | |
| 1655 | cmd->chanlist = chanlist; |
| 1656 | |
| 1657 | return 0; |
| 1658 | } |
| 1659 | |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1660 | /* |
| 1661 | * COMEDI_CMD ioctl |
| 1662 | * asynchronous acquisition command set-up |
| 1663 | * |
| 1664 | * arg: |
| 1665 | * pointer to comedi_cmd structure |
| 1666 | * |
| 1667 | * reads: |
| 1668 | * comedi_cmd structure |
| 1669 | * channel/range list from cmd->chanlist pointer |
| 1670 | * |
| 1671 | * writes: |
| 1672 | * possibly modified comedi_cmd structure (when -EAGAIN returned) |
| 1673 | */ |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 1674 | static int do_cmd_ioctl(struct comedi_device *dev, |
H Hartley Sweeten | cbe01f7 | 2012-09-18 11:41:54 -0700 | [diff] [blame] | 1675 | struct comedi_cmd __user *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1676 | { |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1677 | struct comedi_cmd cmd; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1678 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1679 | struct comedi_async *async; |
H Hartley Sweeten | 95bc359 | 2012-09-18 11:43:52 -0700 | [diff] [blame] | 1680 | unsigned int __user *user_chanlist; |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1681 | int ret; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1682 | |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1683 | /* get the user's cmd and do some simple validation */ |
| 1684 | ret = __comedi_get_user_cmd(dev, arg, &cmd); |
| 1685 | if (ret) |
| 1686 | return ret; |
| 1687 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1688 | /* save user's chanlist pointer so it can be restored later */ |
H Hartley Sweeten | 95bc359 | 2012-09-18 11:43:52 -0700 | [diff] [blame] | 1689 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1690 | |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1691 | s = &dev->subdevices[cmd.subdev]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1692 | async = s->async; |
| 1693 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1694 | /* are we locked? (ioctl lock) */ |
| 1695 | if (s->lock && s->lock != file) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1696 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1697 | return -EACCES; |
| 1698 | } |
| 1699 | |
| 1700 | /* are we busy? */ |
| 1701 | if (s->busy) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1702 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1703 | return -EBUSY; |
| 1704 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1705 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1706 | /* make sure channel/gain list isn't too short */ |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1707 | if (cmd.chanlist_len < 1) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1708 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1709 | cmd.chanlist_len); |
Ian Abbott | 4b18f08 | 2013-07-05 16:49:34 +0100 | [diff] [blame] | 1710 | return -EINVAL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1711 | } |
| 1712 | |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1713 | async->cmd = cmd; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1714 | async->cmd.data = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1715 | |
H Hartley Sweeten | c6cd0ee | 2014-03-06 12:02:57 -0700 | [diff] [blame] | 1716 | /* load channel/gain list */ |
| 1717 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); |
| 1718 | if (ret) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1719 | goto cleanup; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1720 | |
| 1721 | ret = s->do_cmdtest(dev, s, &async->cmd); |
| 1722 | |
Ian Abbott | b0446a2 | 2014-09-03 13:45:44 +0100 | [diff] [blame] | 1723 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1724 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1725 | cmd = async->cmd; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1726 | /* restore chanlist pointer before copying back */ |
H Hartley Sweeten | 95bc359 | 2012-09-18 11:43:52 -0700 | [diff] [blame] | 1727 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
H Hartley Sweeten | 88bc057 | 2012-09-18 11:42:37 -0700 | [diff] [blame] | 1728 | cmd.data = NULL; |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1729 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1730 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1731 | ret = -EFAULT; |
| 1732 | goto cleanup; |
| 1733 | } |
| 1734 | ret = -EAGAIN; |
| 1735 | goto cleanup; |
| 1736 | } |
| 1737 | |
| 1738 | if (!async->prealloc_bufsz) { |
| 1739 | ret = -ENOMEM; |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1740 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1741 | goto cleanup; |
| 1742 | } |
| 1743 | |
Ian Abbott | fcc18a9 | 2014-05-06 13:12:10 +0100 | [diff] [blame] | 1744 | comedi_buf_reset(s); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1745 | |
H Hartley Sweeten | 781f933 | 2014-10-13 09:56:08 -0700 | [diff] [blame] | 1746 | async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
Ian Abbott | d8bff6e | 2014-09-03 13:45:30 +0100 | [diff] [blame] | 1747 | if (async->cmd.flags & CMDF_WAKE_EOS) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1748 | async->cb_mask |= COMEDI_CB_EOS; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1749 | |
Ian Abbott | cc64ea4 | 2015-03-27 15:13:00 +0000 | [diff] [blame] | 1750 | comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
| 1751 | COMEDI_SRF_RUNNING); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1752 | |
H Hartley Sweeten | 84bb0bc | 2015-01-20 12:06:00 -0700 | [diff] [blame] | 1753 | /* |
| 1754 | * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid |
| 1755 | * race with comedi_read() or comedi_write(). |
| 1756 | */ |
Ian Abbott | 4b18f08 | 2013-07-05 16:49:34 +0100 | [diff] [blame] | 1757 | s->busy = file; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1758 | ret = s->do_cmd(dev, s); |
| 1759 | if (ret == 0) |
| 1760 | return 0; |
| 1761 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1762 | cleanup: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1763 | do_become_nonbusy(dev, s); |
| 1764 | |
| 1765 | return ret; |
| 1766 | } |
| 1767 | |
| 1768 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1769 | * COMEDI_CMDTEST ioctl |
Carlos E. Garcia | 69e98df | 2015-04-24 09:40:42 -0400 | [diff] [blame] | 1770 | * asynchronous acquisition command testing |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1771 | * |
| 1772 | * arg: |
| 1773 | * pointer to comedi_cmd structure |
| 1774 | * |
| 1775 | * reads: |
| 1776 | * comedi_cmd structure |
| 1777 | * channel/range list from cmd->chanlist pointer |
| 1778 | * |
| 1779 | * writes: |
| 1780 | * possibly modified comedi_cmd structure |
| 1781 | */ |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 1782 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
| 1783 | struct comedi_cmd __user *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1784 | { |
H Hartley Sweeten | f834867 | 2012-09-18 11:43:13 -0700 | [diff] [blame] | 1785 | struct comedi_cmd cmd; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1786 | struct comedi_subdevice *s; |
H Hartley Sweeten | 95bc359 | 2012-09-18 11:43:52 -0700 | [diff] [blame] | 1787 | unsigned int __user *user_chanlist; |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1788 | int ret; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1789 | |
H Hartley Sweeten | 87ece58 | 2014-03-06 12:02:56 -0700 | [diff] [blame] | 1790 | /* get the user's cmd and do some simple validation */ |
| 1791 | ret = __comedi_get_user_cmd(dev, arg, &cmd); |
| 1792 | if (ret) |
| 1793 | return ret; |
| 1794 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1795 | /* save user's chanlist pointer so it can be restored later */ |
H Hartley Sweeten | 95bc359 | 2012-09-18 11:43:52 -0700 | [diff] [blame] | 1796 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1797 | |
H Hartley Sweeten | f834867 | 2012-09-18 11:43:13 -0700 | [diff] [blame] | 1798 | s = &dev->subdevices[cmd.subdev]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1799 | |
Ian Abbott | 6cab7a3 | 2014-10-08 16:09:14 +0100 | [diff] [blame] | 1800 | /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
| 1801 | if (user_chanlist) { |
| 1802 | /* load channel/gain list */ |
| 1803 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); |
| 1804 | if (ret) |
| 1805 | return ret; |
| 1806 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1807 | |
H Hartley Sweeten | f834867 | 2012-09-18 11:43:13 -0700 | [diff] [blame] | 1808 | ret = s->do_cmdtest(dev, s, &cmd); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1809 | |
Ian Abbott | 238b5ad | 2014-10-20 15:10:40 +0100 | [diff] [blame] | 1810 | kfree(cmd.chanlist); /* free kernel copy of user chanlist */ |
| 1811 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1812 | /* restore chanlist pointer before copying back */ |
H Hartley Sweeten | 95bc359 | 2012-09-18 11:43:52 -0700 | [diff] [blame] | 1813 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1814 | |
H Hartley Sweeten | bc252fd | 2012-12-19 15:42:02 -0700 | [diff] [blame] | 1815 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 1816 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1817 | ret = -EFAULT; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1818 | } |
H Hartley Sweeten | c6cd0ee | 2014-03-06 12:02:57 -0700 | [diff] [blame] | 1819 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1820 | return ret; |
| 1821 | } |
| 1822 | |
| 1823 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1824 | * COMEDI_LOCK ioctl |
| 1825 | * lock subdevice |
| 1826 | * |
| 1827 | * arg: |
| 1828 | * subdevice number |
| 1829 | * |
| 1830 | * reads: |
| 1831 | * nothing |
| 1832 | * |
| 1833 | * writes: |
| 1834 | * nothing |
| 1835 | */ |
Ian Abbott | c1a6eac | 2014-10-28 17:15:47 +0000 | [diff] [blame] | 1836 | static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1837 | void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1838 | { |
| 1839 | int ret = 0; |
| 1840 | unsigned long flags; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1841 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1842 | |
| 1843 | if (arg >= dev->n_subdevices) |
| 1844 | return -EINVAL; |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1845 | s = &dev->subdevices[arg]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1846 | |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 1847 | spin_lock_irqsave(&s->spin_lock, flags); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1848 | if (s->busy || s->lock) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1849 | ret = -EBUSY; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1850 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1851 | s->lock = file; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 1852 | spin_unlock_irqrestore(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1853 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1854 | return ret; |
| 1855 | } |
| 1856 | |
| 1857 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1858 | * COMEDI_UNLOCK ioctl |
| 1859 | * unlock subdevice |
| 1860 | * |
| 1861 | * arg: |
| 1862 | * subdevice number |
| 1863 | * |
| 1864 | * reads: |
| 1865 | * nothing |
| 1866 | * |
| 1867 | * writes: |
| 1868 | * nothing |
| 1869 | */ |
Ian Abbott | c1a6eac | 2014-10-28 17:15:47 +0000 | [diff] [blame] | 1870 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1871 | void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1872 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1873 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1874 | |
| 1875 | if (arg >= dev->n_subdevices) |
| 1876 | return -EINVAL; |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1877 | s = &dev->subdevices[arg]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1878 | |
| 1879 | if (s->busy) |
| 1880 | return -EBUSY; |
| 1881 | |
| 1882 | if (s->lock && s->lock != file) |
| 1883 | return -EACCES; |
| 1884 | |
H Hartley Sweeten | 90ac076 | 2014-07-21 11:01:26 -0700 | [diff] [blame] | 1885 | if (s->lock == file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1886 | s->lock = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1887 | |
| 1888 | return 0; |
| 1889 | } |
| 1890 | |
| 1891 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1892 | * COMEDI_CANCEL ioctl |
| 1893 | * cancel asynchronous acquisition |
| 1894 | * |
| 1895 | * arg: |
| 1896 | * subdevice number |
| 1897 | * |
| 1898 | * reads: |
| 1899 | * nothing |
| 1900 | * |
| 1901 | * writes: |
| 1902 | * nothing |
| 1903 | */ |
Ian Abbott | c1a6eac | 2014-10-28 17:15:47 +0000 | [diff] [blame] | 1904 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1905 | void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1906 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1907 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1908 | |
| 1909 | if (arg >= dev->n_subdevices) |
| 1910 | return -EINVAL; |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1911 | s = &dev->subdevices[arg]; |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 1912 | if (!s->async) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1913 | return -EINVAL; |
| 1914 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1915 | if (!s->busy) |
| 1916 | return 0; |
| 1917 | |
| 1918 | if (s->busy != file) |
| 1919 | return -EBUSY; |
| 1920 | |
Heena Sirwani | fe43ec5 | 2014-10-06 13:46:09 +0530 | [diff] [blame] | 1921 | return do_cancel(dev, s); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1922 | } |
| 1923 | |
| 1924 | /* |
Ian Abbott | 18e01b2 | 2015-01-28 18:41:47 +0000 | [diff] [blame] | 1925 | * COMEDI_POLL ioctl |
| 1926 | * instructs driver to synchronize buffers |
| 1927 | * |
| 1928 | * arg: |
| 1929 | * subdevice number |
| 1930 | * |
| 1931 | * reads: |
| 1932 | * nothing |
| 1933 | * |
| 1934 | * writes: |
| 1935 | * nothing |
| 1936 | */ |
Ian Abbott | c1a6eac | 2014-10-28 17:15:47 +0000 | [diff] [blame] | 1937 | static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 1938 | void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1939 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1940 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1941 | |
| 1942 | if (arg >= dev->n_subdevices) |
| 1943 | return -EINVAL; |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 1944 | s = &dev->subdevices[arg]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1945 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1946 | if (!s->busy) |
| 1947 | return 0; |
| 1948 | |
| 1949 | if (s->busy != file) |
| 1950 | return -EBUSY; |
| 1951 | |
| 1952 | if (s->poll) |
| 1953 | return s->poll(dev, s); |
| 1954 | |
| 1955 | return -EINVAL; |
| 1956 | } |
| 1957 | |
Ian Abbott | c299a67 | 2014-11-04 18:09:01 +0000 | [diff] [blame] | 1958 | /* |
| 1959 | * COMEDI_SETRSUBD ioctl |
| 1960 | * sets the current "read" subdevice on a per-file basis |
| 1961 | * |
| 1962 | * arg: |
| 1963 | * subdevice number |
| 1964 | * |
| 1965 | * reads: |
| 1966 | * nothing |
| 1967 | * |
| 1968 | * writes: |
| 1969 | * nothing |
| 1970 | */ |
| 1971 | static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, |
| 1972 | struct file *file) |
| 1973 | { |
| 1974 | struct comedi_file *cfp = file->private_data; |
| 1975 | struct comedi_subdevice *s_old, *s_new; |
| 1976 | |
| 1977 | if (arg >= dev->n_subdevices) |
| 1978 | return -EINVAL; |
| 1979 | |
| 1980 | s_new = &dev->subdevices[arg]; |
| 1981 | s_old = comedi_file_read_subdevice(file); |
| 1982 | if (s_old == s_new) |
| 1983 | return 0; /* no change */ |
| 1984 | |
| 1985 | if (!(s_new->subdev_flags & SDF_CMD_READ)) |
| 1986 | return -EINVAL; |
| 1987 | |
| 1988 | /* |
| 1989 | * Check the file isn't still busy handling a "read" command on the |
| 1990 | * old subdevice (if any). |
| 1991 | */ |
| 1992 | if (s_old && s_old->busy == file && s_old->async && |
| 1993 | !(s_old->async->cmd.flags & CMDF_WRITE)) |
| 1994 | return -EBUSY; |
| 1995 | |
Shyam Saini | 34d3473 | 2016-05-10 21:21:07 +0530 | [diff] [blame] | 1996 | WRITE_ONCE(cfp->read_subdev, s_new); |
Ian Abbott | c299a67 | 2014-11-04 18:09:01 +0000 | [diff] [blame] | 1997 | return 0; |
| 1998 | } |
| 1999 | |
| 2000 | /* |
| 2001 | * COMEDI_SETWSUBD ioctl |
| 2002 | * sets the current "write" subdevice on a per-file basis |
| 2003 | * |
| 2004 | * arg: |
| 2005 | * subdevice number |
| 2006 | * |
| 2007 | * reads: |
| 2008 | * nothing |
| 2009 | * |
| 2010 | * writes: |
| 2011 | * nothing |
| 2012 | */ |
| 2013 | static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, |
| 2014 | struct file *file) |
| 2015 | { |
| 2016 | struct comedi_file *cfp = file->private_data; |
| 2017 | struct comedi_subdevice *s_old, *s_new; |
| 2018 | |
| 2019 | if (arg >= dev->n_subdevices) |
| 2020 | return -EINVAL; |
| 2021 | |
| 2022 | s_new = &dev->subdevices[arg]; |
| 2023 | s_old = comedi_file_write_subdevice(file); |
| 2024 | if (s_old == s_new) |
| 2025 | return 0; /* no change */ |
| 2026 | |
| 2027 | if (!(s_new->subdev_flags & SDF_CMD_WRITE)) |
| 2028 | return -EINVAL; |
| 2029 | |
| 2030 | /* |
| 2031 | * Check the file isn't still busy handling a "write" command on the |
| 2032 | * old subdevice (if any). |
| 2033 | */ |
| 2034 | if (s_old && s_old->busy == file && s_old->async && |
| 2035 | (s_old->async->cmd.flags & CMDF_WRITE)) |
| 2036 | return -EBUSY; |
| 2037 | |
Shyam Saini | 34d3473 | 2016-05-10 21:21:07 +0530 | [diff] [blame] | 2038 | WRITE_ONCE(cfp->write_subdev, s_new); |
Ian Abbott | c299a67 | 2014-11-04 18:09:01 +0000 | [diff] [blame] | 2039 | return 0; |
| 2040 | } |
| 2041 | |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2042 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
| 2043 | unsigned long arg) |
| 2044 | { |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 2045 | unsigned int minor = iminor(file_inode(file)); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2046 | struct comedi_file *cfp = file->private_data; |
| 2047 | struct comedi_device *dev = cfp->dev; |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2048 | int rc; |
| 2049 | |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2050 | mutex_lock(&dev->mutex); |
| 2051 | |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 2052 | /* |
| 2053 | * Device config is special, because it must work on |
| 2054 | * an unconfigured device. |
| 2055 | */ |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2056 | if (cmd == COMEDI_DEVCONFIG) { |
Ian Abbott | 754ab5c | 2013-01-28 16:14:31 +0000 | [diff] [blame] | 2057 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
| 2058 | /* Device config not appropriate on non-board minors. */ |
| 2059 | rc = -ENOTTY; |
| 2060 | goto done; |
| 2061 | } |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2062 | rc = do_devconfig_ioctl(dev, |
| 2063 | (struct comedi_devconfig __user *)arg); |
Ian Abbott | 8ab4ed6 | 2013-04-04 14:58:54 +0100 | [diff] [blame] | 2064 | if (rc == 0) { |
| 2065 | if (arg == 0 && |
| 2066 | dev->minor >= comedi_num_legacy_minors) { |
Ian Abbott | a2aab8b | 2015-01-28 18:41:50 +0000 | [diff] [blame] | 2067 | /* |
| 2068 | * Successfully unconfigured a dynamically |
| 2069 | * allocated device. Try and remove it. |
| 2070 | */ |
Ian Abbott | db210da | 2013-04-04 14:59:18 +0100 | [diff] [blame] | 2071 | if (comedi_clear_board_dev(dev)) { |
Ian Abbott | 8ab4ed6 | 2013-04-04 14:58:54 +0100 | [diff] [blame] | 2072 | mutex_unlock(&dev->mutex); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 2073 | comedi_free_board_dev(dev); |
Ian Abbott | 8ab4ed6 | 2013-04-04 14:58:54 +0100 | [diff] [blame] | 2074 | return rc; |
| 2075 | } |
| 2076 | } |
| 2077 | } |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2078 | goto done; |
| 2079 | } |
| 2080 | |
| 2081 | if (!dev->attached) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2082 | dev_dbg(dev->class_dev, "no driver attached\n"); |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2083 | rc = -ENODEV; |
| 2084 | goto done; |
| 2085 | } |
| 2086 | |
| 2087 | switch (cmd) { |
| 2088 | case COMEDI_BUFCONFIG: |
| 2089 | rc = do_bufconfig_ioctl(dev, |
| 2090 | (struct comedi_bufconfig __user *)arg); |
| 2091 | break; |
| 2092 | case COMEDI_DEVINFO: |
| 2093 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, |
| 2094 | file); |
| 2095 | break; |
| 2096 | case COMEDI_SUBDINFO: |
| 2097 | rc = do_subdinfo_ioctl(dev, |
| 2098 | (struct comedi_subdinfo __user *)arg, |
| 2099 | file); |
| 2100 | break; |
| 2101 | case COMEDI_CHANINFO: |
| 2102 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); |
| 2103 | break; |
| 2104 | case COMEDI_RANGEINFO: |
| 2105 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); |
| 2106 | break; |
| 2107 | case COMEDI_BUFINFO: |
| 2108 | rc = do_bufinfo_ioctl(dev, |
| 2109 | (struct comedi_bufinfo __user *)arg, |
| 2110 | file); |
| 2111 | break; |
| 2112 | case COMEDI_LOCK: |
| 2113 | rc = do_lock_ioctl(dev, arg, file); |
| 2114 | break; |
| 2115 | case COMEDI_UNLOCK: |
| 2116 | rc = do_unlock_ioctl(dev, arg, file); |
| 2117 | break; |
| 2118 | case COMEDI_CANCEL: |
| 2119 | rc = do_cancel_ioctl(dev, arg, file); |
| 2120 | break; |
| 2121 | case COMEDI_CMD: |
| 2122 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); |
| 2123 | break; |
| 2124 | case COMEDI_CMDTEST: |
| 2125 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, |
| 2126 | file); |
| 2127 | break; |
| 2128 | case COMEDI_INSNLIST: |
| 2129 | rc = do_insnlist_ioctl(dev, |
| 2130 | (struct comedi_insnlist __user *)arg, |
| 2131 | file); |
| 2132 | break; |
| 2133 | case COMEDI_INSN: |
| 2134 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, |
| 2135 | file); |
| 2136 | break; |
| 2137 | case COMEDI_POLL: |
| 2138 | rc = do_poll_ioctl(dev, arg, file); |
| 2139 | break; |
Ian Abbott | c299a67 | 2014-11-04 18:09:01 +0000 | [diff] [blame] | 2140 | case COMEDI_SETRSUBD: |
| 2141 | rc = do_setrsubd_ioctl(dev, arg, file); |
| 2142 | break; |
| 2143 | case COMEDI_SETWSUBD: |
| 2144 | rc = do_setwsubd_ioctl(dev, arg, file); |
| 2145 | break; |
H Hartley Sweeten | 47db6d5 | 2012-06-07 17:05:27 -0700 | [diff] [blame] | 2146 | default: |
| 2147 | rc = -ENOTTY; |
| 2148 | break; |
| 2149 | } |
| 2150 | |
| 2151 | done: |
| 2152 | mutex_unlock(&dev->mutex); |
| 2153 | return rc; |
| 2154 | } |
| 2155 | |
Federico Vaga | df30b21 | 2011-10-29 09:45:39 +0200 | [diff] [blame] | 2156 | static void comedi_vm_open(struct vm_area_struct *area) |
| 2157 | { |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2158 | struct comedi_buf_map *bm; |
Federico Vaga | df30b21 | 2011-10-29 09:45:39 +0200 | [diff] [blame] | 2159 | |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2160 | bm = area->vm_private_data; |
| 2161 | comedi_buf_map_get(bm); |
Federico Vaga | df30b21 | 2011-10-29 09:45:39 +0200 | [diff] [blame] | 2162 | } |
| 2163 | |
| 2164 | static void comedi_vm_close(struct vm_area_struct *area) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2165 | { |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2166 | struct comedi_buf_map *bm; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2167 | |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2168 | bm = area->vm_private_data; |
| 2169 | comedi_buf_map_put(bm); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2170 | } |
| 2171 | |
Kirill A. Shutemov | 7cbea8d | 2015-09-09 15:39:26 -0700 | [diff] [blame] | 2172 | static const struct vm_operations_struct comedi_vm_ops = { |
Federico Vaga | df30b21 | 2011-10-29 09:45:39 +0200 | [diff] [blame] | 2173 | .open = comedi_vm_open, |
| 2174 | .close = comedi_vm_close, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2175 | }; |
| 2176 | |
| 2177 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) |
| 2178 | { |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2179 | struct comedi_file *cfp = file->private_data; |
| 2180 | struct comedi_device *dev = cfp->dev; |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2181 | struct comedi_subdevice *s; |
| 2182 | struct comedi_async *async; |
Ian Abbott | b34aa86 | 2014-04-10 19:41:57 +0100 | [diff] [blame] | 2183 | struct comedi_buf_map *bm = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2184 | unsigned long start = vma->vm_start; |
| 2185 | unsigned long size; |
| 2186 | int n_pages; |
| 2187 | int i; |
| 2188 | int retval; |
Bernd Porr | 3ffab42 | 2011-11-08 21:23:03 +0000 | [diff] [blame] | 2189 | |
Ian Abbott | b34aa86 | 2014-04-10 19:41:57 +0100 | [diff] [blame] | 2190 | /* |
| 2191 | * 'trylock' avoids circular dependency with current->mm->mmap_sem |
| 2192 | * and down-reading &dev->attach_lock should normally succeed without |
| 2193 | * contention unless the device is in the process of being attached |
| 2194 | * or detached. |
| 2195 | */ |
| 2196 | if (!down_read_trylock(&dev->attach_lock)) |
| 2197 | return -EAGAIN; |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2198 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2199 | if (!dev->attached) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2200 | dev_dbg(dev->class_dev, "no driver attached\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2201 | retval = -ENODEV; |
| 2202 | goto done; |
| 2203 | } |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2204 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2205 | if (vma->vm_flags & VM_WRITE) |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2206 | s = comedi_file_write_subdevice(file); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2207 | else |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2208 | s = comedi_file_read_subdevice(file); |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2209 | if (!s) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2210 | retval = -EINVAL; |
| 2211 | goto done; |
| 2212 | } |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2213 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2214 | async = s->async; |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2215 | if (!async) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2216 | retval = -EINVAL; |
| 2217 | goto done; |
| 2218 | } |
| 2219 | |
| 2220 | if (vma->vm_pgoff != 0) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2221 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2222 | retval = -EINVAL; |
| 2223 | goto done; |
| 2224 | } |
| 2225 | |
| 2226 | size = vma->vm_end - vma->vm_start; |
| 2227 | if (size > async->prealloc_bufsz) { |
| 2228 | retval = -EFAULT; |
| 2229 | goto done; |
| 2230 | } |
Sandhya Bankar | 44b8c79 | 2016-03-06 12:35:29 +0530 | [diff] [blame] | 2231 | if (offset_in_page(size)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2232 | retval = -EFAULT; |
| 2233 | goto done; |
| 2234 | } |
| 2235 | |
sayli karnik | ec9d075 | 2016-09-20 03:21:38 +0530 | [diff] [blame] | 2236 | n_pages = vma_pages(vma); |
Ian Abbott | b34aa86 | 2014-04-10 19:41:57 +0100 | [diff] [blame] | 2237 | |
| 2238 | /* get reference to current buf map (if any) */ |
| 2239 | bm = comedi_buf_map_from_subdev_get(s); |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2240 | if (!bm || n_pages > bm->n_pages) { |
| 2241 | retval = -EINVAL; |
| 2242 | goto done; |
| 2243 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2244 | for (i = 0; i < n_pages; ++i) { |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2245 | struct comedi_buf_page *buf = &bm->page_list[i]; |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2246 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2247 | if (remap_pfn_range(vma, start, |
H Hartley Sweeten | a52840a | 2012-12-19 15:45:12 -0700 | [diff] [blame] | 2248 | page_to_pfn(virt_to_page(buf->virt_addr)), |
| 2249 | PAGE_SIZE, PAGE_SHARED)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2250 | retval = -EAGAIN; |
| 2251 | goto done; |
| 2252 | } |
| 2253 | start += PAGE_SIZE; |
| 2254 | } |
| 2255 | |
| 2256 | vma->vm_ops = &comedi_vm_ops; |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2257 | vma->vm_private_data = bm; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2258 | |
Ian Abbott | af93da3 | 2013-11-08 15:03:43 +0000 | [diff] [blame] | 2259 | vma->vm_ops->open(vma); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2260 | |
| 2261 | retval = 0; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2262 | done: |
Ian Abbott | b34aa86 | 2014-04-10 19:41:57 +0100 | [diff] [blame] | 2263 | up_read(&dev->attach_lock); |
| 2264 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2265 | return retval; |
| 2266 | } |
| 2267 | |
Benedikt Bergenthal | 1ae5062 | 2012-04-16 12:40:22 +0200 | [diff] [blame] | 2268 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2269 | { |
| 2270 | unsigned int mask = 0; |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2271 | struct comedi_file *cfp = file->private_data; |
| 2272 | struct comedi_device *dev = cfp->dev; |
Ian Abbott | 322146d | 2015-10-09 12:26:47 +0100 | [diff] [blame] | 2273 | struct comedi_subdevice *s, *s_read; |
Bernd Porr | 3ffab42 | 2011-11-08 21:23:03 +0000 | [diff] [blame] | 2274 | |
Ian Abbott | d5eb3a7 | 2015-10-09 12:26:52 +0100 | [diff] [blame] | 2275 | down_read(&dev->attach_lock); |
H Hartley Sweeten | ca081b1 | 2012-12-19 15:39:44 -0700 | [diff] [blame] | 2276 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2277 | if (!dev->attached) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2278 | dev_dbg(dev->class_dev, "no driver attached\n"); |
H Hartley Sweeten | ca081b1 | 2012-12-19 15:39:44 -0700 | [diff] [blame] | 2279 | goto done; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2280 | } |
| 2281 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2282 | s = comedi_file_read_subdevice(file); |
Ian Abbott | 322146d | 2015-10-09 12:26:47 +0100 | [diff] [blame] | 2283 | s_read = s; |
Ian Abbott | cc400e1 | 2013-02-05 12:50:40 +0000 | [diff] [blame] | 2284 | if (s && s->async) { |
H Hartley Sweeten | ca081b1 | 2012-12-19 15:39:44 -0700 | [diff] [blame] | 2285 | poll_wait(file, &s->async->wait_head, wait); |
Ian Abbott | 3834234 | 2015-10-09 12:26:51 +0100 | [diff] [blame] | 2286 | if (s->busy != file || !comedi_is_subdevice_running(s) || |
Ian Abbott | 662c722 | 2014-10-30 12:42:31 +0000 | [diff] [blame] | 2287 | (s->async->cmd.flags & CMDF_WRITE) || |
Ian Abbott | e9edef3 | 2014-05-06 13:12:09 +0100 | [diff] [blame] | 2288 | comedi_buf_read_n_available(s) > 0) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2289 | mask |= POLLIN | POLLRDNORM; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2290 | } |
| 2291 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2292 | s = comedi_file_write_subdevice(file); |
Ian Abbott | cc400e1 | 2013-02-05 12:50:40 +0000 | [diff] [blame] | 2293 | if (s && s->async) { |
H Hartley Sweeten | c39e050 | 2014-10-31 12:04:28 -0700 | [diff] [blame] | 2294 | unsigned int bps = comedi_bytes_per_sample(s); |
H Hartley Sweeten | ca081b1 | 2012-12-19 15:39:44 -0700 | [diff] [blame] | 2295 | |
Ian Abbott | 322146d | 2015-10-09 12:26:47 +0100 | [diff] [blame] | 2296 | if (s != s_read) |
| 2297 | poll_wait(file, &s->async->wait_head, wait); |
Ian Abbott | 3834234 | 2015-10-09 12:26:51 +0100 | [diff] [blame] | 2298 | if (s->busy != file || !comedi_is_subdevice_running(s) || |
Ian Abbott | 662c722 | 2014-10-30 12:42:31 +0000 | [diff] [blame] | 2299 | !(s->async->cmd.flags & CMDF_WRITE) || |
Ian Abbott | ecf04ed | 2015-10-09 12:26:50 +0100 | [diff] [blame] | 2300 | comedi_buf_write_n_available(s) >= bps) |
H Hartley Sweeten | ca081b1 | 2012-12-19 15:39:44 -0700 | [diff] [blame] | 2301 | mask |= POLLOUT | POLLWRNORM; |
| 2302 | } |
| 2303 | |
| 2304 | done: |
Ian Abbott | d5eb3a7 | 2015-10-09 12:26:52 +0100 | [diff] [blame] | 2305 | up_read(&dev->attach_lock); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2306 | return mask; |
| 2307 | } |
| 2308 | |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 2309 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
| 2310 | size_t nbytes, loff_t *offset) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2311 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2312 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 2313 | struct comedi_async *async; |
Ian Abbott | 84a185e | 2015-11-18 17:55:06 +0000 | [diff] [blame] | 2314 | unsigned int n, m; |
| 2315 | ssize_t count = 0; |
| 2316 | int retval = 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2317 | DECLARE_WAITQUEUE(wait, current); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2318 | struct comedi_file *cfp = file->private_data; |
| 2319 | struct comedi_device *dev = cfp->dev; |
Ian Abbott | 06181de | 2015-11-18 17:55:04 +0000 | [diff] [blame] | 2320 | bool become_nonbusy = false; |
Ian Abbott | 9329f13 | 2013-11-08 15:03:30 +0000 | [diff] [blame] | 2321 | bool attach_locked; |
| 2322 | unsigned int old_detach_count; |
Bernd Porr | 3ffab42 | 2011-11-08 21:23:03 +0000 | [diff] [blame] | 2323 | |
Ian Abbott | 9329f13 | 2013-11-08 15:03:30 +0000 | [diff] [blame] | 2324 | /* Protect against device detachment during operation. */ |
| 2325 | down_read(&dev->attach_lock); |
| 2326 | attach_locked = true; |
| 2327 | old_detach_count = dev->detach_count; |
| 2328 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2329 | if (!dev->attached) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2330 | dev_dbg(dev->class_dev, "no driver attached\n"); |
Ian Abbott | 9329f13 | 2013-11-08 15:03:30 +0000 | [diff] [blame] | 2331 | retval = -ENODEV; |
| 2332 | goto out; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2333 | } |
| 2334 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2335 | s = comedi_file_write_subdevice(file); |
Ian Abbott | 9329f13 | 2013-11-08 15:03:30 +0000 | [diff] [blame] | 2336 | if (!s || !s->async) { |
| 2337 | retval = -EIO; |
| 2338 | goto out; |
| 2339 | } |
H Hartley Sweeten | 2714b01 | 2012-12-19 15:40:34 -0700 | [diff] [blame] | 2340 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2341 | async = s->async; |
Ian Abbott | 3318c7a | 2015-11-18 17:55:10 +0000 | [diff] [blame] | 2342 | if (s->busy != file || !(async->cmd.flags & CMDF_WRITE)) { |
Ian Abbott | f739850 | 2014-10-30 12:42:30 +0000 | [diff] [blame] | 2343 | retval = -EINVAL; |
| 2344 | goto out; |
| 2345 | } |
H Hartley Sweeten | 2714b01 | 2012-12-19 15:40:34 -0700 | [diff] [blame] | 2346 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2347 | add_wait_queue(&async->wait_head, &wait); |
Ian Abbott | 06181de | 2015-11-18 17:55:04 +0000 | [diff] [blame] | 2348 | while (count == 0 && !retval) { |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 2349 | unsigned int runflags; |
Ian Abbott | 35a7475 | 2015-11-18 17:55:08 +0000 | [diff] [blame] | 2350 | unsigned int wp, n1, n2; |
Ian Abbott | b183a83 | 2015-03-27 15:13:01 +0000 | [diff] [blame] | 2351 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2352 | set_current_state(TASK_INTERRUPTIBLE); |
| 2353 | |
Ian Abbott | b183a83 | 2015-03-27 15:13:01 +0000 | [diff] [blame] | 2354 | runflags = comedi_get_subdevice_runflags(s); |
| 2355 | if (!comedi_is_runflags_running(runflags)) { |
Ian Abbott | 06181de | 2015-11-18 17:55:04 +0000 | [diff] [blame] | 2356 | if (comedi_is_runflags_in_error(runflags)) |
| 2357 | retval = -EPIPE; |
Ian Abbott | 28a60c4 | 2015-11-18 17:55:11 +0000 | [diff] [blame] | 2358 | if (retval || nbytes) |
| 2359 | become_nonbusy = true; |
Ian Abbott | d261154 | 2010-05-19 17:22:41 +0100 | [diff] [blame] | 2360 | break; |
| 2361 | } |
Ian Abbott | 28a60c4 | 2015-11-18 17:55:11 +0000 | [diff] [blame] | 2362 | if (nbytes == 0) |
| 2363 | break; |
Ian Abbott | d261154 | 2010-05-19 17:22:41 +0100 | [diff] [blame] | 2364 | |
Ian Abbott | 591c5f8 | 2015-11-18 17:55:07 +0000 | [diff] [blame] | 2365 | /* Allocate all free buffer space. */ |
| 2366 | comedi_buf_write_alloc(s, async->prealloc_bufsz); |
| 2367 | m = comedi_buf_write_n_allocated(s); |
Ian Abbott | 591c5f8 | 2015-11-18 17:55:07 +0000 | [diff] [blame] | 2368 | n = min_t(size_t, m, nbytes); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2369 | |
| 2370 | if (n == 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2371 | if (file->f_flags & O_NONBLOCK) { |
| 2372 | retval = -EAGAIN; |
| 2373 | break; |
| 2374 | } |
Federico Vaga | 6a9ce6b | 2011-10-29 09:47:39 +0200 | [diff] [blame] | 2375 | schedule(); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2376 | if (signal_pending(current)) { |
| 2377 | retval = -ERESTARTSYS; |
| 2378 | break; |
| 2379 | } |
Ian Abbott | 3318c7a | 2015-11-18 17:55:10 +0000 | [diff] [blame] | 2380 | if (s->busy != file || |
| 2381 | !(async->cmd.flags & CMDF_WRITE)) { |
Ian Abbott | f739850 | 2014-10-30 12:42:30 +0000 | [diff] [blame] | 2382 | retval = -EINVAL; |
| 2383 | break; |
| 2384 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2385 | continue; |
| 2386 | } |
| 2387 | |
Ian Abbott | 35a7475 | 2015-11-18 17:55:08 +0000 | [diff] [blame] | 2388 | wp = async->buf_write_ptr; |
| 2389 | n1 = min(n, async->prealloc_bufsz - wp); |
| 2390 | n2 = n - n1; |
| 2391 | m = copy_from_user(async->prealloc_buf + wp, buf, n1); |
| 2392 | if (m) |
| 2393 | m += n2; |
| 2394 | else if (n2) |
| 2395 | m = copy_from_user(async->prealloc_buf, buf + n1, n2); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2396 | if (m) { |
| 2397 | n -= m; |
| 2398 | retval = -EFAULT; |
| 2399 | } |
Ian Abbott | 940dd35 | 2014-05-06 13:12:05 +0100 | [diff] [blame] | 2400 | comedi_buf_write_free(s, n); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2401 | |
| 2402 | count += n; |
| 2403 | nbytes -= n; |
| 2404 | |
| 2405 | buf += n; |
Ian Abbott | 06181de | 2015-11-18 17:55:04 +0000 | [diff] [blame] | 2406 | } |
| 2407 | remove_wait_queue(&async->wait_head, &wait); |
| 2408 | set_current_state(TASK_RUNNING); |
| 2409 | if (become_nonbusy && count == 0) { |
| 2410 | struct comedi_subdevice *new_s; |
| 2411 | |
| 2412 | /* |
| 2413 | * To avoid deadlock, cannot acquire dev->mutex |
| 2414 | * while dev->attach_lock is held. |
| 2415 | */ |
| 2416 | up_read(&dev->attach_lock); |
| 2417 | attach_locked = false; |
| 2418 | mutex_lock(&dev->mutex); |
| 2419 | /* |
| 2420 | * Check device hasn't become detached behind our back. |
| 2421 | * Checking dev->detach_count is unchanged ought to be |
| 2422 | * sufficient (unless there have been 2**32 detaches in the |
| 2423 | * meantime!), but check the subdevice pointer as well just in |
| 2424 | * case. |
Ian Abbott | ed65bba | 2015-11-18 17:55:05 +0000 | [diff] [blame] | 2425 | * |
| 2426 | * Also check the subdevice is still in a suitable state to |
| 2427 | * become non-busy in case it changed behind our back. |
Ian Abbott | 06181de | 2015-11-18 17:55:04 +0000 | [diff] [blame] | 2428 | */ |
| 2429 | new_s = comedi_file_write_subdevice(file); |
| 2430 | if (dev->attached && old_detach_count == dev->detach_count && |
Ian Abbott | ed65bba | 2015-11-18 17:55:05 +0000 | [diff] [blame] | 2431 | s == new_s && new_s->async == async && s->busy == file && |
| 2432 | (async->cmd.flags & CMDF_WRITE) && |
| 2433 | !comedi_is_subdevice_running(s)) |
Ian Abbott | 06181de | 2015-11-18 17:55:04 +0000 | [diff] [blame] | 2434 | do_become_nonbusy(dev, s); |
| 2435 | mutex_unlock(&dev->mutex); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2436 | } |
Ian Abbott | 9329f13 | 2013-11-08 15:03:30 +0000 | [diff] [blame] | 2437 | out: |
Ian Abbott | 9329f13 | 2013-11-08 15:03:30 +0000 | [diff] [blame] | 2438 | if (attach_locked) |
| 2439 | up_read(&dev->attach_lock); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2440 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2441 | return count ? count : retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2442 | } |
| 2443 | |
Greg Kroah-Hartman | 92d0127 | 2010-05-03 16:32:28 -0700 | [diff] [blame] | 2444 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
H Hartley Sweeten | 36efbac | 2014-07-18 14:28:14 -0700 | [diff] [blame] | 2445 | loff_t *offset) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2446 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2447 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 2448 | struct comedi_async *async; |
Ian Abbott | 76e8e7d | 2015-10-12 17:21:23 +0100 | [diff] [blame] | 2449 | unsigned int n, m; |
| 2450 | ssize_t count = 0; |
| 2451 | int retval = 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2452 | DECLARE_WAITQUEUE(wait, current); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2453 | struct comedi_file *cfp = file->private_data; |
| 2454 | struct comedi_device *dev = cfp->dev; |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2455 | unsigned int old_detach_count; |
| 2456 | bool become_nonbusy = false; |
| 2457 | bool attach_locked; |
Bernd Porr | 3ffab42 | 2011-11-08 21:23:03 +0000 | [diff] [blame] | 2458 | |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2459 | /* Protect against device detachment during operation. */ |
| 2460 | down_read(&dev->attach_lock); |
| 2461 | attach_locked = true; |
| 2462 | old_detach_count = dev->detach_count; |
| 2463 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2464 | if (!dev->attached) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2465 | dev_dbg(dev->class_dev, "no driver attached\n"); |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2466 | retval = -ENODEV; |
| 2467 | goto out; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2468 | } |
| 2469 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2470 | s = comedi_file_read_subdevice(file); |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2471 | if (!s || !s->async) { |
| 2472 | retval = -EIO; |
| 2473 | goto out; |
| 2474 | } |
H Hartley Sweeten | 5c87fef | 2012-12-19 15:40:08 -0700 | [diff] [blame] | 2475 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2476 | async = s->async; |
Ian Abbott | 3958284 | 2015-10-12 17:21:28 +0100 | [diff] [blame] | 2477 | if (s->busy != file || (async->cmd.flags & CMDF_WRITE)) { |
Ian Abbott | f025ab9 | 2014-10-30 12:42:29 +0000 | [diff] [blame] | 2478 | retval = -EINVAL; |
| 2479 | goto out; |
| 2480 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2481 | |
| 2482 | add_wait_queue(&async->wait_head, &wait); |
Ian Abbott | 3c3bea2 | 2015-10-12 17:21:29 +0100 | [diff] [blame] | 2483 | while (count == 0 && !retval) { |
Ian Abbott | 42ea907 | 2015-10-12 17:21:25 +0100 | [diff] [blame] | 2484 | unsigned int rp, n1, n2; |
| 2485 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2486 | set_current_state(TASK_INTERRUPTIBLE); |
| 2487 | |
Ian Abbott | e9edef3 | 2014-05-06 13:12:09 +0100 | [diff] [blame] | 2488 | m = comedi_buf_read_n_available(s); |
Ian Abbott | 8ea9392 | 2015-10-12 17:21:24 +0100 | [diff] [blame] | 2489 | n = min_t(size_t, m, nbytes); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2490 | |
| 2491 | if (n == 0) { |
Ian Abbott | b2073dc | 2016-03-29 10:49:04 +0100 | [diff] [blame] | 2492 | unsigned int runflags = |
| 2493 | comedi_get_subdevice_runflags(s); |
Ian Abbott | b183a83 | 2015-03-27 15:13:01 +0000 | [diff] [blame] | 2494 | |
| 2495 | if (!comedi_is_runflags_running(runflags)) { |
| 2496 | if (comedi_is_runflags_in_error(runflags)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2497 | retval = -EPIPE; |
Ian Abbott | 3c3bea2 | 2015-10-12 17:21:29 +0100 | [diff] [blame] | 2498 | if (retval || nbytes) |
| 2499 | become_nonbusy = true; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2500 | break; |
| 2501 | } |
Ian Abbott | 3c3bea2 | 2015-10-12 17:21:29 +0100 | [diff] [blame] | 2502 | if (nbytes == 0) |
| 2503 | break; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2504 | if (file->f_flags & O_NONBLOCK) { |
| 2505 | retval = -EAGAIN; |
| 2506 | break; |
| 2507 | } |
Federico Vaga | 6a9ce6b | 2011-10-29 09:47:39 +0200 | [diff] [blame] | 2508 | schedule(); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2509 | if (signal_pending(current)) { |
| 2510 | retval = -ERESTARTSYS; |
| 2511 | break; |
| 2512 | } |
Ian Abbott | 3958284 | 2015-10-12 17:21:28 +0100 | [diff] [blame] | 2513 | if (s->busy != file || |
| 2514 | (async->cmd.flags & CMDF_WRITE)) { |
Ian Abbott | f025ab9 | 2014-10-30 12:42:29 +0000 | [diff] [blame] | 2515 | retval = -EINVAL; |
| 2516 | break; |
| 2517 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2518 | continue; |
| 2519 | } |
Ian Abbott | 42ea907 | 2015-10-12 17:21:25 +0100 | [diff] [blame] | 2520 | rp = async->buf_read_ptr; |
| 2521 | n1 = min(n, async->prealloc_bufsz - rp); |
| 2522 | n2 = n - n1; |
| 2523 | m = copy_to_user(buf, async->prealloc_buf + rp, n1); |
| 2524 | if (m) |
| 2525 | m += n2; |
| 2526 | else if (n2) |
| 2527 | m = copy_to_user(buf + n1, async->prealloc_buf, n2); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2528 | if (m) { |
| 2529 | n -= m; |
| 2530 | retval = -EFAULT; |
| 2531 | } |
| 2532 | |
Ian Abbott | d13be55 | 2014-05-06 13:12:07 +0100 | [diff] [blame] | 2533 | comedi_buf_read_alloc(s, n); |
Ian Abbott | f1df866 | 2014-05-06 13:12:08 +0100 | [diff] [blame] | 2534 | comedi_buf_read_free(s, n); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2535 | |
| 2536 | count += n; |
| 2537 | nbytes -= n; |
| 2538 | |
| 2539 | buf += n; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2540 | } |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2541 | remove_wait_queue(&async->wait_head, &wait); |
| 2542 | set_current_state(TASK_RUNNING); |
Ian Abbott | 970679b | 2015-10-12 17:21:20 +0100 | [diff] [blame] | 2543 | if (become_nonbusy && count == 0) { |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2544 | struct comedi_subdevice *new_s; |
| 2545 | |
| 2546 | /* |
| 2547 | * To avoid deadlock, cannot acquire dev->mutex |
| 2548 | * while dev->attach_lock is held. |
| 2549 | */ |
| 2550 | up_read(&dev->attach_lock); |
| 2551 | attach_locked = false; |
Ian Abbott | 4b18f08 | 2013-07-05 16:49:34 +0100 | [diff] [blame] | 2552 | mutex_lock(&dev->mutex); |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2553 | /* |
| 2554 | * Check device hasn't become detached behind our back. |
| 2555 | * Checking dev->detach_count is unchanged ought to be |
| 2556 | * sufficient (unless there have been 2**32 detaches in the |
| 2557 | * meantime!), but check the subdevice pointer as well just in |
| 2558 | * case. |
Ian Abbott | fd060c8 | 2015-10-12 17:21:22 +0100 | [diff] [blame] | 2559 | * |
| 2560 | * Also check the subdevice is still in a suitable state to |
| 2561 | * become non-busy in case it changed behind our back. |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2562 | */ |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2563 | new_s = comedi_file_read_subdevice(file); |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2564 | if (dev->attached && old_detach_count == dev->detach_count && |
Ian Abbott | fd060c8 | 2015-10-12 17:21:22 +0100 | [diff] [blame] | 2565 | s == new_s && new_s->async == async && s->busy == file && |
| 2566 | !(async->cmd.flags & CMDF_WRITE) && |
| 2567 | !comedi_is_subdevice_running(s) && |
| 2568 | comedi_buf_read_n_available(s) == 0) |
| 2569 | do_become_nonbusy(dev, s); |
Ian Abbott | 4b18f08 | 2013-07-05 16:49:34 +0100 | [diff] [blame] | 2570 | mutex_unlock(&dev->mutex); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2571 | } |
Ian Abbott | 45c2bc5 | 2013-11-08 15:03:31 +0000 | [diff] [blame] | 2572 | out: |
| 2573 | if (attach_locked) |
| 2574 | up_read(&dev->attach_lock); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2575 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2576 | return count ? count : retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2577 | } |
| 2578 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2579 | static int comedi_open(struct inode *inode, struct file *file) |
| 2580 | { |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 2581 | const unsigned int minor = iminor(inode); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2582 | struct comedi_file *cfp; |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2583 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
| 2584 | int rc; |
Ian Abbott | 9792007 | 2009-02-09 16:51:38 +0000 | [diff] [blame] | 2585 | |
H Hartley Sweeten | 4da5fa9 | 2012-12-19 15:35:23 -0700 | [diff] [blame] | 2586 | if (!dev) { |
H Hartley Sweeten | 272850f | 2013-11-26 10:21:11 -0700 | [diff] [blame] | 2587 | pr_debug("invalid minor number\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2588 | return -ENODEV; |
| 2589 | } |
| 2590 | |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2591 | cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
| 2592 | if (!cfp) |
| 2593 | return -ENOMEM; |
| 2594 | |
| 2595 | cfp->dev = dev; |
| 2596 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2597 | mutex_lock(&dev->mutex); |
Ian Abbott | 0e0d311 | 2015-07-07 17:06:52 +0100 | [diff] [blame] | 2598 | if (!dev->attached && !capable(CAP_SYS_ADMIN)) { |
| 2599 | dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n"); |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2600 | rc = -ENODEV; |
| 2601 | goto out; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2602 | } |
Ian Abbott | 1363e4f | 2013-12-11 14:51:03 +0000 | [diff] [blame] | 2603 | if (dev->attached && dev->use_count == 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2604 | if (!try_module_get(dev->driver->module)) { |
Santhosh Pai | 90e6f51 | 2015-06-29 10:44:03 +0100 | [diff] [blame] | 2605 | rc = -ENXIO; |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2606 | goto out; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2607 | } |
Ian Abbott | 1363e4f | 2013-12-11 14:51:03 +0000 | [diff] [blame] | 2608 | if (dev->open) { |
| 2609 | rc = dev->open(dev); |
| 2610 | if (rc < 0) { |
| 2611 | module_put(dev->driver->module); |
| 2612 | goto out; |
| 2613 | } |
Ian Abbott | 3c17ba07 | 2010-05-19 14:10:00 +0100 | [diff] [blame] | 2614 | } |
| 2615 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2616 | |
| 2617 | dev->use_count++; |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2618 | file->private_data = cfp; |
| 2619 | comedi_file_reset(file); |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2620 | rc = 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2621 | |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2622 | out: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2623 | mutex_unlock(&dev->mutex); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2624 | if (rc) { |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2625 | comedi_dev_put(dev); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2626 | kfree(cfp); |
| 2627 | } |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2628 | return rc; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2629 | } |
| 2630 | |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 2631 | static int comedi_fasync(int fd, struct file *file, int on) |
| 2632 | { |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2633 | struct comedi_file *cfp = file->private_data; |
| 2634 | struct comedi_device *dev = cfp->dev; |
H Hartley Sweeten | 2aae007 | 2012-12-19 15:31:57 -0700 | [diff] [blame] | 2635 | |
| 2636 | return fasync_helper(fd, file, on, &dev->async_queue); |
| 2637 | } |
| 2638 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2639 | static int comedi_close(struct inode *inode, struct file *file) |
| 2640 | { |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2641 | struct comedi_file *cfp = file->private_data; |
| 2642 | struct comedi_device *dev = cfp->dev; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2643 | struct comedi_subdevice *s = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2644 | int i; |
Bernd Porr | 3ffab42 | 2011-11-08 21:23:03 +0000 | [diff] [blame] | 2645 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2646 | mutex_lock(&dev->mutex); |
| 2647 | |
| 2648 | if (dev->subdevices) { |
| 2649 | for (i = 0; i < dev->n_subdevices; i++) { |
H Hartley Sweeten | b077f2c | 2012-09-05 18:20:58 -0700 | [diff] [blame] | 2650 | s = &dev->subdevices[i]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2651 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2652 | if (s->busy == file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2653 | do_cancel(dev, s); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2654 | if (s->lock == file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2655 | s->lock = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2656 | } |
| 2657 | } |
Ian Abbott | 1363e4f | 2013-12-11 14:51:03 +0000 | [diff] [blame] | 2658 | if (dev->attached && dev->use_count == 1) { |
| 2659 | if (dev->close) |
| 2660 | dev->close(dev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2661 | module_put(dev->driver->module); |
Ian Abbott | 1363e4f | 2013-12-11 14:51:03 +0000 | [diff] [blame] | 2662 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2663 | |
| 2664 | dev->use_count--; |
| 2665 | |
| 2666 | mutex_unlock(&dev->mutex); |
Ian Abbott | fc40698 | 2013-11-08 15:03:34 +0000 | [diff] [blame] | 2667 | comedi_dev_put(dev); |
Ian Abbott | 20f083c | 2014-11-04 18:09:00 +0000 | [diff] [blame] | 2668 | kfree(cfp); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2669 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2670 | return 0; |
| 2671 | } |
| 2672 | |
Ian Abbott | 8cb8aad | 2012-06-19 10:17:43 +0100 | [diff] [blame] | 2673 | static const struct file_operations comedi_fops = { |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 2674 | .owner = THIS_MODULE, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 2675 | .unlocked_ioctl = comedi_unlocked_ioctl, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 2676 | .compat_ioctl = comedi_compat_ioctl, |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 2677 | .open = comedi_open, |
| 2678 | .release = comedi_close, |
| 2679 | .read = comedi_read, |
| 2680 | .write = comedi_write, |
| 2681 | .mmap = comedi_mmap, |
| 2682 | .poll = comedi_poll, |
| 2683 | .fasync = comedi_fasync, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2684 | .llseek = noop_llseek, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2685 | }; |
| 2686 | |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 2687 | /** |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 2688 | * comedi_event() - Handle events for asynchronous COMEDI command |
| 2689 | * @dev: COMEDI device. |
| 2690 | * @s: COMEDI subdevice. |
| 2691 | * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 2692 | * |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 2693 | * If an asynchronous COMEDI command is active on the subdevice, process |
| 2694 | * any %COMEDI_CB_... event flags that have been set, usually by an |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 2695 | * interrupt handler. These may change the run state of the asynchronous |
Ian Abbott | a3e3994 | 2015-09-23 16:33:27 +0100 | [diff] [blame] | 2696 | * command, wake a task, and/or send a %SIGIO signal. |
Ian Abbott | dd630cd | 2015-01-28 18:41:46 +0000 | [diff] [blame] | 2697 | */ |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2698 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2699 | { |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 2700 | struct comedi_async *async = s->async; |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2701 | unsigned int events; |
| 2702 | int si_code = 0; |
| 2703 | unsigned long flags; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2704 | |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2705 | spin_lock_irqsave(&s->spin_lock, flags); |
| 2706 | |
| 2707 | events = async->events; |
Ian Abbott | 922d9ce | 2015-03-27 15:13:04 +0000 | [diff] [blame] | 2708 | async->events = 0; |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2709 | if (!__comedi_is_subdevice_running(s)) { |
| 2710 | spin_unlock_irqrestore(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2711 | return; |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2712 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2713 | |
Ian Abbott | 922d9ce | 2015-03-27 15:13:04 +0000 | [diff] [blame] | 2714 | if (events & COMEDI_CB_CANCEL_MASK) |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2715 | __comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING); |
H Hartley Sweeten | 781f933 | 2014-10-13 09:56:08 -0700 | [diff] [blame] | 2716 | |
| 2717 | /* |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2718 | * Remember if an error event has occurred, so an error can be |
| 2719 | * returned the next time the user does a read() or write(). |
H Hartley Sweeten | 781f933 | 2014-10-13 09:56:08 -0700 | [diff] [blame] | 2720 | */ |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2721 | if (events & COMEDI_CB_ERROR_MASK) |
| 2722 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2723 | |
Ian Abbott | 922d9ce | 2015-03-27 15:13:04 +0000 | [diff] [blame] | 2724 | if (async->cb_mask & events) { |
Ian Abbott | c265be0 | 2013-11-08 15:03:22 +0000 | [diff] [blame] | 2725 | wake_up_interruptible(&async->wait_head); |
Ian Abbott | aa33122 | 2015-03-27 15:13:05 +0000 | [diff] [blame] | 2726 | si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2727 | } |
Ian Abbott | ef4b4b2 | 2015-03-27 15:13:06 +0000 | [diff] [blame] | 2728 | |
| 2729 | spin_unlock_irqrestore(&s->spin_lock, flags); |
| 2730 | |
| 2731 | if (si_code) |
| 2732 | kill_fasync(&dev->async_queue, SIGIO, si_code); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2733 | } |
H Hartley Sweeten | 5660e74 | 2013-04-12 10:11:54 -0700 | [diff] [blame] | 2734 | EXPORT_SYMBOL_GPL(comedi_event); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2735 | |
Ian Abbott | 0777839 | 2013-04-04 14:58:51 +0100 | [diff] [blame] | 2736 | /* Note: the ->mutex is pre-locked on successful return */ |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2737 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2738 | { |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2739 | struct comedi_device *dev; |
Bill Pemberton | 0bfbbe8 | 2009-03-16 22:05:36 -0400 | [diff] [blame] | 2740 | struct device *csdev; |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 2741 | unsigned int i; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2742 | |
H Hartley Sweeten | 36efbac | 2014-07-18 14:28:14 -0700 | [diff] [blame] | 2743 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 2744 | if (!dev) |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2745 | return ERR_PTR(-ENOMEM); |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2746 | comedi_device_init(dev); |
Ian Abbott | db2e348 | 2013-04-04 14:59:00 +0100 | [diff] [blame] | 2747 | comedi_set_hw_dev(dev, hardware_device); |
Ian Abbott | 0777839 | 2013-04-04 14:58:51 +0100 | [diff] [blame] | 2748 | mutex_lock(&dev->mutex); |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2749 | mutex_lock(&comedi_board_minor_table_lock); |
Ian Abbott | 38b9722 | 2013-04-04 14:58:52 +0100 | [diff] [blame] | 2750 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
| 2751 | i < COMEDI_NUM_BOARD_MINORS; ++i) { |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 2752 | if (!comedi_board_minor_table[i]) { |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 2753 | comedi_board_minor_table[i] = dev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2754 | break; |
| 2755 | } |
| 2756 | } |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2757 | mutex_unlock(&comedi_board_minor_table_lock); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2758 | if (i == COMEDI_NUM_BOARD_MINORS) { |
Ian Abbott | 0777839 | 2013-04-04 14:58:51 +0100 | [diff] [blame] | 2759 | mutex_unlock(&dev->mutex); |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2760 | comedi_device_cleanup(dev); |
Ian Abbott | 5b13ed9 | 2013-11-08 15:03:32 +0000 | [diff] [blame] | 2761 | comedi_dev_put(dev); |
Haneen Mohammed | a112eab | 2015-03-17 08:33:51 +0300 | [diff] [blame] | 2762 | dev_err(hardware_device, |
| 2763 | "ran out of minor numbers for board device files\n"); |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2764 | return ERR_PTR(-EBUSY); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2765 | } |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2766 | dev->minor = i; |
Pavel Roskin | 0435f93 | 2011-07-06 10:15:44 -0400 | [diff] [blame] | 2767 | csdev = device_create(comedi_class, hardware_device, |
| 2768 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2769 | if (!IS_ERR(csdev)) |
Ian Abbott | 8f988d8 | 2013-12-11 14:51:02 +0000 | [diff] [blame] | 2770 | dev->class_dev = get_device(csdev); |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 2771 | |
Ian Abbott | 0777839 | 2013-04-04 14:58:51 +0100 | [diff] [blame] | 2772 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2773 | return dev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2774 | } |
| 2775 | |
Ian Abbott | 3346b79 | 2013-04-04 14:58:47 +0100 | [diff] [blame] | 2776 | void comedi_release_hardware_device(struct device *hardware_device) |
Ian Abbott | c43435d | 2012-03-30 17:14:58 +0100 | [diff] [blame] | 2777 | { |
| 2778 | int minor; |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 2779 | struct comedi_device *dev; |
Ian Abbott | c43435d | 2012-03-30 17:14:58 +0100 | [diff] [blame] | 2780 | |
Ian Abbott | 38b9722 | 2013-04-04 14:58:52 +0100 | [diff] [blame] | 2781 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
| 2782 | minor++) { |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2783 | mutex_lock(&comedi_board_minor_table_lock); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 2784 | dev = comedi_board_minor_table[minor]; |
| 2785 | if (dev && dev->hw_dev == hardware_device) { |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2786 | comedi_board_minor_table[minor] = NULL; |
| 2787 | mutex_unlock(&comedi_board_minor_table_lock); |
Ian Abbott | cb6b79d | 2013-04-04 14:59:16 +0100 | [diff] [blame] | 2788 | comedi_free_board_dev(dev); |
Ian Abbott | 3346b79 | 2013-04-04 14:58:47 +0100 | [diff] [blame] | 2789 | break; |
Ian Abbott | c43435d | 2012-03-30 17:14:58 +0100 | [diff] [blame] | 2790 | } |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2791 | mutex_unlock(&comedi_board_minor_table_lock); |
Ian Abbott | c43435d | 2012-03-30 17:14:58 +0100 | [diff] [blame] | 2792 | } |
Ian Abbott | c43435d | 2012-03-30 17:14:58 +0100 | [diff] [blame] | 2793 | } |
| 2794 | |
Ian Abbott | f65cc54 | 2013-02-01 10:20:30 +0000 | [diff] [blame] | 2795 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2796 | { |
Ian Abbott | f65cc54 | 2013-02-01 10:20:30 +0000 | [diff] [blame] | 2797 | struct comedi_device *dev = s->device; |
Bill Pemberton | 0bfbbe8 | 2009-03-16 22:05:36 -0400 | [diff] [blame] | 2798 | struct device *csdev; |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 2799 | unsigned int i; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2800 | |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2801 | mutex_lock(&comedi_subdevice_minor_table_lock); |
| 2802 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 2803 | if (!comedi_subdevice_minor_table[i]) { |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 2804 | comedi_subdevice_minor_table[i] = s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2805 | break; |
| 2806 | } |
| 2807 | } |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2808 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
| 2809 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { |
Haneen Mohammed | a112eab | 2015-03-17 08:33:51 +0300 | [diff] [blame] | 2810 | dev_err(dev->class_dev, |
| 2811 | "ran out of minor numbers for subdevice files\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2812 | return -EBUSY; |
| 2813 | } |
Ian Abbott | 5b7dba1 | 2013-04-04 14:59:04 +0100 | [diff] [blame] | 2814 | i += COMEDI_NUM_BOARD_MINORS; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2815 | s->minor = i; |
Pavel Roskin | 0435f93 | 2011-07-06 10:15:44 -0400 | [diff] [blame] | 2816 | csdev = device_create(comedi_class, dev->class_dev, |
| 2817 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", |
H Hartley Sweeten | 90a35c1 | 2012-12-19 17:27:02 -0700 | [diff] [blame] | 2818 | dev->minor, s->index); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2819 | if (!IS_ERR(csdev)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2820 | s->class_dev = csdev; |
H Hartley Sweeten | a5011a2 | 2012-05-09 09:20:08 -0700 | [diff] [blame] | 2821 | |
Ian Abbott | da71854 | 2013-02-07 16:03:00 +0000 | [diff] [blame] | 2822 | return 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2823 | } |
| 2824 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2825 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2826 | { |
Ian Abbott | 0fcc9d4 | 2013-04-04 14:59:13 +0100 | [diff] [blame] | 2827 | unsigned int i; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2828 | |
H Hartley Sweeten | 88cc30c | 2015-03-04 12:15:28 -0700 | [diff] [blame] | 2829 | if (!s) |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2830 | return; |
H Hartley Sweeten | 5104a89 | 2015-08-10 13:14:01 -0700 | [diff] [blame] | 2831 | if (s->minor < COMEDI_NUM_BOARD_MINORS || |
| 2832 | s->minor >= COMEDI_NUM_MINORS) |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2833 | return; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2834 | |
Ian Abbott | 0fcc9d4 | 2013-04-04 14:59:13 +0100 | [diff] [blame] | 2835 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
| 2836 | mutex_lock(&comedi_subdevice_minor_table_lock); |
Ian Abbott | bd5b417 | 2013-04-04 14:59:15 +0100 | [diff] [blame] | 2837 | if (s == comedi_subdevice_minor_table[i]) |
| 2838 | comedi_subdevice_minor_table[i] = NULL; |
Ian Abbott | 0fcc9d4 | 2013-04-04 14:59:13 +0100 | [diff] [blame] | 2839 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2840 | if (s->class_dev) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2841 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
| 2842 | s->class_dev = NULL; |
| 2843 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2844 | } |
H Hartley Sweeten | a578782 | 2012-12-19 15:40:59 -0700 | [diff] [blame] | 2845 | |
Ian Abbott | 682b911 | 2013-01-28 17:07:39 +0000 | [diff] [blame] | 2846 | static void comedi_cleanup_board_minors(void) |
H Hartley Sweeten | 76cca89 | 2012-12-19 15:41:42 -0700 | [diff] [blame] | 2847 | { |
H Hartley Sweeten | 2be8ae5 | 2015-08-10 13:13:59 -0700 | [diff] [blame] | 2848 | struct comedi_device *dev; |
Leslie Klein | d4d4789 | 2016-03-21 09:18:35 -0400 | [diff] [blame] | 2849 | unsigned int i; |
H Hartley Sweeten | 76cca89 | 2012-12-19 15:41:42 -0700 | [diff] [blame] | 2850 | |
H Hartley Sweeten | 2be8ae5 | 2015-08-10 13:13:59 -0700 | [diff] [blame] | 2851 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { |
| 2852 | dev = comedi_clear_board_minor(i); |
| 2853 | comedi_free_board_dev(dev); |
| 2854 | } |
H Hartley Sweeten | 76cca89 | 2012-12-19 15:41:42 -0700 | [diff] [blame] | 2855 | } |
| 2856 | |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2857 | static int __init comedi_init(void) |
| 2858 | { |
| 2859 | int i; |
| 2860 | int retval; |
| 2861 | |
H Hartley Sweeten | c2ad078 | 2014-07-17 12:27:32 -0700 | [diff] [blame] | 2862 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2863 | |
| 2864 | if (comedi_num_legacy_minors < 0 || |
| 2865 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { |
H Hartley Sweeten | c2ad078 | 2014-07-17 12:27:32 -0700 | [diff] [blame] | 2866 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2867 | COMEDI_NUM_BOARD_MINORS); |
| 2868 | return -EINVAL; |
| 2869 | } |
| 2870 | |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2871 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 2872 | COMEDI_NUM_MINORS, "comedi"); |
| 2873 | if (retval) |
| 2874 | return -EIO; |
| 2875 | cdev_init(&comedi_cdev, &comedi_fops); |
| 2876 | comedi_cdev.owner = THIS_MODULE; |
Anton Protopopov | a5bde3a | 2014-07-09 09:12:37 +0400 | [diff] [blame] | 2877 | |
| 2878 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); |
| 2879 | if (retval) { |
| 2880 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 2881 | COMEDI_NUM_MINORS); |
| 2882 | return retval; |
| 2883 | } |
| 2884 | |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2885 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
| 2886 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 2887 | COMEDI_NUM_MINORS); |
| 2888 | return -EIO; |
| 2889 | } |
| 2890 | comedi_class = class_create(THIS_MODULE, "comedi"); |
| 2891 | if (IS_ERR(comedi_class)) { |
H Hartley Sweeten | c2ad078 | 2014-07-17 12:27:32 -0700 | [diff] [blame] | 2892 | pr_err("failed to create class\n"); |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2893 | cdev_del(&comedi_cdev); |
| 2894 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 2895 | COMEDI_NUM_MINORS); |
| 2896 | return PTR_ERR(comedi_class); |
| 2897 | } |
| 2898 | |
Greg Kroah-Hartman | e56341a | 2013-07-24 15:05:25 -0700 | [diff] [blame] | 2899 | comedi_class->dev_groups = comedi_dev_groups; |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2900 | |
| 2901 | /* XXX requires /proc interface */ |
| 2902 | comedi_proc_init(); |
| 2903 | |
| 2904 | /* create devices files for legacy/manual use */ |
| 2905 | for (i = 0; i < comedi_num_legacy_minors; i++) { |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2906 | struct comedi_device *dev; |
Raghavendra Ganiga | 4bac39f | 2014-05-01 13:53:12 +0530 | [diff] [blame] | 2907 | |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2908 | dev = comedi_alloc_board_minor(NULL); |
| 2909 | if (IS_ERR(dev)) { |
Ian Abbott | 682b911 | 2013-01-28 17:07:39 +0000 | [diff] [blame] | 2910 | comedi_cleanup_board_minors(); |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2911 | cdev_del(&comedi_cdev); |
| 2912 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
| 2913 | COMEDI_NUM_MINORS); |
Ian Abbott | 7638ffc | 2013-04-04 14:58:50 +0100 | [diff] [blame] | 2914 | return PTR_ERR(dev); |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2915 | } |
Kinka Huang | cb3aada | 2014-07-15 23:11:02 +0800 | [diff] [blame] | 2916 | /* comedi_alloc_board_minor() locked the mutex */ |
| 2917 | mutex_unlock(&dev->mutex); |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2918 | } |
| 2919 | |
| 2920 | return 0; |
| 2921 | } |
| 2922 | module_init(comedi_init); |
| 2923 | |
| 2924 | static void __exit comedi_cleanup(void) |
| 2925 | { |
Ian Abbott | 682b911 | 2013-01-28 17:07:39 +0000 | [diff] [blame] | 2926 | comedi_cleanup_board_minors(); |
H Hartley Sweeten | 91fa0b0 | 2012-12-19 15:41:19 -0700 | [diff] [blame] | 2927 | class_destroy(comedi_class); |
| 2928 | cdev_del(&comedi_cdev); |
| 2929 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); |
| 2930 | |
| 2931 | comedi_proc_cleanup(); |
| 2932 | } |
| 2933 | module_exit(comedi_cleanup); |
| 2934 | |
H Hartley Sweeten | a578782 | 2012-12-19 15:40:59 -0700 | [diff] [blame] | 2935 | MODULE_AUTHOR("http://www.comedi.org"); |
| 2936 | MODULE_DESCRIPTION("Comedi core module"); |
| 2937 | MODULE_LICENSE("GPL"); |