David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1 | /* |
| 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 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | |
| 22 | */ |
| 23 | |
| 24 | #undef DEBUG |
| 25 | |
| 26 | #define __NO_VERSION__ |
| 27 | #include "comedi_fops.h" |
| 28 | #include "comedi_compat32.h" |
| 29 | |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/sched.h> |
| 34 | #include <linux/fcntl.h> |
| 35 | #include <linux/delay.h> |
| 36 | #include <linux/ioport.h> |
| 37 | #include <linux/mm.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/kmod.h> |
| 40 | #include <linux/poll.h> |
| 41 | #include <linux/init.h> |
| 42 | #include <linux/device.h> |
| 43 | #include <linux/vmalloc.h> |
| 44 | #include <linux/fs.h> |
| 45 | #include "comedidev.h" |
| 46 | #include <linux/cdev.h> |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 47 | #include <linux/stat.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 48 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 49 | #include <linux/io.h> |
| 50 | #include <linux/uaccess.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 51 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 52 | /* #include "kvmem.h" */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 53 | |
| 54 | MODULE_AUTHOR("http://www.comedi.org"); |
| 55 | MODULE_DESCRIPTION("Comedi core module"); |
| 56 | MODULE_LICENSE("GPL"); |
| 57 | |
| 58 | #ifdef CONFIG_COMEDI_DEBUG |
| 59 | int comedi_debug; |
| 60 | module_param(comedi_debug, int, 0644); |
| 61 | #endif |
| 62 | |
Ian Abbott | 6a9d7a2 | 2008-12-08 17:05:50 +0000 | [diff] [blame] | 63 | int comedi_autoconfig = 1; |
| 64 | module_param(comedi_autoconfig, bool, 0444); |
| 65 | |
Bernd Porr | 1dd33ab | 2008-12-08 23:30:13 +0000 | [diff] [blame] | 66 | int comedi_num_legacy_minors = 0; |
| 67 | module_param(comedi_num_legacy_minors, int, 0444); |
| 68 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 69 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 70 | static struct comedi_device_file_info |
| 71 | *comedi_file_info_table[COMEDI_NUM_MINORS]; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 72 | |
Bill Pemberton | 0707bb0 | 2009-03-16 22:06:20 -0400 | [diff] [blame] | 73 | static int do_devconfig_ioctl(struct comedi_device *dev, struct comedi_devconfig *arg); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 74 | static int do_bufconfig_ioctl(struct comedi_device *dev, void *arg); |
Bill Pemberton | 063db04 | 2009-03-16 22:06:15 -0400 | [diff] [blame] | 75 | static int do_devinfo_ioctl(struct comedi_device *dev, struct comedi_devinfo *arg, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 76 | struct file *file); |
Bill Pemberton | bd52efb | 2009-03-16 22:06:09 -0400 | [diff] [blame] | 77 | static int do_subdinfo_ioctl(struct comedi_device *dev, struct comedi_subdinfo *arg, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 78 | void *file); |
Bill Pemberton | a18b416 | 2009-03-16 22:06:04 -0400 | [diff] [blame] | 79 | static int do_chaninfo_ioctl(struct comedi_device *dev, struct comedi_chaninfo *arg); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 80 | static int do_bufinfo_ioctl(struct comedi_device *dev, void *arg); |
| 81 | static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file); |
| 82 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, void *file); |
| 83 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, void *file); |
| 84 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, void *file); |
| 85 | static int do_cmdtest_ioctl(struct comedi_device *dev, void *arg, void *file); |
| 86 | static int do_insnlist_ioctl(struct comedi_device *dev, void *arg, void *file); |
| 87 | static int do_insn_ioctl(struct comedi_device *dev, void *arg, void *file); |
| 88 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd, void *file); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 89 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 90 | extern void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s); |
| 91 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 92 | |
| 93 | static int comedi_fasync(int fd, struct file *file, int on); |
| 94 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 95 | static int is_device_busy(struct comedi_device *dev); |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 96 | static int resize_async_buffer(struct comedi_device *dev, |
| 97 | struct comedi_subdevice *s, |
| 98 | struct comedi_async *async, unsigned new_size); |
| 99 | |
| 100 | /* declarations for sysfs attribute files */ |
| 101 | static struct device_attribute dev_attr_max_read_buffer_kb; |
| 102 | static struct device_attribute dev_attr_read_buffer_kb; |
| 103 | static struct device_attribute dev_attr_max_write_buffer_kb; |
| 104 | static struct device_attribute dev_attr_write_buffer_kb; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 105 | |
| 106 | #ifdef HAVE_UNLOCKED_IOCTL |
| 107 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 108 | unsigned long arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 109 | #else |
| 110 | static int comedi_ioctl(struct inode *inode, struct file *file, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 111 | unsigned int cmd, unsigned long arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 112 | #endif |
| 113 | { |
| 114 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 115 | struct comedi_device_file_info *dev_file_info = |
| 116 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 117 | struct comedi_device *dev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 118 | int rc; |
| 119 | |
Frank Mori Hess | 53b670a | 2008-12-15 13:48:47 +0000 | [diff] [blame] | 120 | if (dev_file_info == NULL || dev_file_info->device == NULL) |
| 121 | return -ENODEV; |
| 122 | dev = dev_file_info->device; |
| 123 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 124 | mutex_lock(&dev->mutex); |
| 125 | |
| 126 | /* Device config is special, because it must work on |
| 127 | * an unconfigured device. */ |
| 128 | if (cmd == COMEDI_DEVCONFIG) { |
| 129 | rc = do_devconfig_ioctl(dev, (void *)arg); |
| 130 | goto done; |
| 131 | } |
| 132 | |
| 133 | if (!dev->attached) { |
| 134 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); |
| 135 | rc = -ENODEV; |
| 136 | goto done; |
| 137 | } |
| 138 | |
| 139 | switch (cmd) { |
| 140 | case COMEDI_BUFCONFIG: |
| 141 | rc = do_bufconfig_ioctl(dev, (void *)arg); |
| 142 | break; |
| 143 | case COMEDI_DEVINFO: |
| 144 | rc = do_devinfo_ioctl(dev, (void *)arg, file); |
| 145 | break; |
| 146 | case COMEDI_SUBDINFO: |
| 147 | rc = do_subdinfo_ioctl(dev, (void *)arg, file); |
| 148 | break; |
| 149 | case COMEDI_CHANINFO: |
| 150 | rc = do_chaninfo_ioctl(dev, (void *)arg); |
| 151 | break; |
| 152 | case COMEDI_RANGEINFO: |
| 153 | rc = do_rangeinfo_ioctl(dev, (void *)arg); |
| 154 | break; |
| 155 | case COMEDI_BUFINFO: |
| 156 | rc = do_bufinfo_ioctl(dev, (void *)arg); |
| 157 | break; |
| 158 | case COMEDI_LOCK: |
| 159 | rc = do_lock_ioctl(dev, arg, file); |
| 160 | break; |
| 161 | case COMEDI_UNLOCK: |
| 162 | rc = do_unlock_ioctl(dev, arg, file); |
| 163 | break; |
| 164 | case COMEDI_CANCEL: |
| 165 | rc = do_cancel_ioctl(dev, arg, file); |
| 166 | break; |
| 167 | case COMEDI_CMD: |
| 168 | rc = do_cmd_ioctl(dev, (void *)arg, file); |
| 169 | break; |
| 170 | case COMEDI_CMDTEST: |
| 171 | rc = do_cmdtest_ioctl(dev, (void *)arg, file); |
| 172 | break; |
| 173 | case COMEDI_INSNLIST: |
| 174 | rc = do_insnlist_ioctl(dev, (void *)arg, file); |
| 175 | break; |
| 176 | case COMEDI_INSN: |
| 177 | rc = do_insn_ioctl(dev, (void *)arg, file); |
| 178 | break; |
| 179 | case COMEDI_POLL: |
| 180 | rc = do_poll_ioctl(dev, arg, file); |
| 181 | break; |
| 182 | default: |
| 183 | rc = -ENOTTY; |
| 184 | break; |
| 185 | } |
| 186 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 187 | done: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 188 | mutex_unlock(&dev->mutex); |
| 189 | return rc; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | COMEDI_DEVCONFIG |
| 194 | device config ioctl |
| 195 | |
| 196 | arg: |
| 197 | pointer to devconfig structure |
| 198 | |
| 199 | reads: |
| 200 | devconfig structure at arg |
| 201 | |
| 202 | writes: |
| 203 | none |
| 204 | */ |
Bill Pemberton | 0707bb0 | 2009-03-16 22:06:20 -0400 | [diff] [blame] | 205 | static int do_devconfig_ioctl(struct comedi_device *dev, struct comedi_devconfig *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 206 | { |
Bill Pemberton | 0707bb0 | 2009-03-16 22:06:20 -0400 | [diff] [blame] | 207 | struct comedi_devconfig it; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 208 | int ret; |
| 209 | unsigned char *aux_data = NULL; |
| 210 | int aux_len; |
| 211 | |
| 212 | if (!capable(CAP_SYS_ADMIN)) |
| 213 | return -EPERM; |
| 214 | |
| 215 | if (arg == NULL) { |
| 216 | if (is_device_busy(dev)) |
| 217 | return -EBUSY; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 218 | if (dev->attached) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 219 | struct module *driver_module = dev->driver->module; |
| 220 | comedi_device_detach(dev); |
| 221 | module_put(driver_module); |
| 222 | } |
| 223 | return 0; |
| 224 | } |
| 225 | |
Bill Pemberton | 0707bb0 | 2009-03-16 22:06:20 -0400 | [diff] [blame] | 226 | if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 227 | return -EFAULT; |
| 228 | |
| 229 | it.board_name[COMEDI_NAMELEN - 1] = 0; |
| 230 | |
| 231 | if (comedi_aux_data(it.options, 0) && |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 232 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 233 | int bit_shift; |
| 234 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; |
| 235 | if (aux_len < 0) |
| 236 | return -EFAULT; |
| 237 | |
| 238 | aux_data = vmalloc(aux_len); |
| 239 | if (!aux_data) |
| 240 | return -ENOMEM; |
| 241 | |
| 242 | if (copy_from_user(aux_data, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 243 | comedi_aux_data(it.options, 0), aux_len)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 244 | vfree(aux_data); |
| 245 | return -EFAULT; |
| 246 | } |
| 247 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 248 | (unsigned long)aux_data; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 249 | if (sizeof(void *) > sizeof(int)) { |
| 250 | bit_shift = sizeof(int) * 8; |
| 251 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 252 | ((unsigned long)aux_data) >> bit_shift; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 253 | } else |
| 254 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; |
| 255 | } |
| 256 | |
| 257 | ret = comedi_device_attach(dev, &it); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 258 | if (ret == 0) { |
| 259 | if (!try_module_get(dev->driver->module)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 260 | comedi_device_detach(dev); |
| 261 | return -ENOSYS; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | if (aux_data) |
| 266 | vfree(aux_data); |
| 267 | |
| 268 | return ret; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | COMEDI_BUFCONFIG |
| 273 | buffer configuration ioctl |
| 274 | |
| 275 | arg: |
| 276 | pointer to bufconfig structure |
| 277 | |
| 278 | reads: |
| 279 | bufconfig at arg |
| 280 | |
| 281 | writes: |
| 282 | modified bufconfig at arg |
| 283 | |
| 284 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 285 | static int do_bufconfig_ioctl(struct comedi_device *dev, void *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 286 | { |
Bill Pemberton | be6aba4 | 2009-03-16 22:06:37 -0400 | [diff] [blame] | 287 | struct comedi_bufconfig bc; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 288 | struct comedi_async *async; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 289 | struct comedi_subdevice *s; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 290 | int retval = 0; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 291 | |
Bill Pemberton | be6aba4 | 2009-03-16 22:06:37 -0400 | [diff] [blame] | 292 | if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 293 | return -EFAULT; |
| 294 | |
| 295 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) |
| 296 | return -EINVAL; |
| 297 | |
| 298 | s = dev->subdevices + bc.subdevice; |
| 299 | async = s->async; |
| 300 | |
| 301 | if (!async) { |
| 302 | DPRINTK("subdevice does not have async capability\n"); |
| 303 | bc.size = 0; |
| 304 | bc.maximum_size = 0; |
| 305 | goto copyback; |
| 306 | } |
| 307 | |
| 308 | if (bc.maximum_size) { |
| 309 | if (!capable(CAP_SYS_ADMIN)) |
| 310 | return -EPERM; |
| 311 | |
| 312 | async->max_bufsize = bc.maximum_size; |
| 313 | } |
| 314 | |
| 315 | if (bc.size) { |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 316 | retval = resize_async_buffer(dev, s, async, bc.size); |
| 317 | if (retval < 0) |
| 318 | return retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | bc.size = async->prealloc_bufsz; |
| 322 | bc.maximum_size = async->max_bufsize; |
| 323 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 324 | copyback: |
Bill Pemberton | be6aba4 | 2009-03-16 22:06:37 -0400 | [diff] [blame] | 325 | if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 326 | return -EFAULT; |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | COMEDI_DEVINFO |
| 333 | device info ioctl |
| 334 | |
| 335 | arg: |
| 336 | pointer to devinfo structure |
| 337 | |
| 338 | reads: |
| 339 | none |
| 340 | |
| 341 | writes: |
| 342 | devinfo structure |
| 343 | |
| 344 | */ |
Bill Pemberton | 063db04 | 2009-03-16 22:06:15 -0400 | [diff] [blame] | 345 | static int do_devinfo_ioctl(struct comedi_device *dev, struct comedi_devinfo *arg, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 346 | struct file *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 347 | { |
Bill Pemberton | 063db04 | 2009-03-16 22:06:15 -0400 | [diff] [blame] | 348 | struct comedi_devinfo devinfo; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 349 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 350 | struct comedi_device_file_info *dev_file_info = |
| 351 | comedi_get_device_file_info(minor); |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 352 | struct comedi_subdevice *read_subdev = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 353 | comedi_get_read_subdevice(dev_file_info); |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 354 | struct comedi_subdevice *write_subdev = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 355 | comedi_get_write_subdevice(dev_file_info); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 356 | |
| 357 | memset(&devinfo, 0, sizeof(devinfo)); |
| 358 | |
| 359 | /* fill devinfo structure */ |
| 360 | devinfo.version_code = COMEDI_VERSION_CODE; |
| 361 | devinfo.n_subdevs = dev->n_subdevices; |
| 362 | memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
| 363 | memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); |
| 364 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 365 | if (read_subdev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 366 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 367 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 368 | devinfo.read_subdevice = -1; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 369 | |
| 370 | if (write_subdev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 371 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 372 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 373 | devinfo.write_subdevice = -1; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 374 | |
Bill Pemberton | 063db04 | 2009-03-16 22:06:15 -0400 | [diff] [blame] | 375 | if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 376 | return -EFAULT; |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | COMEDI_SUBDINFO |
| 383 | subdevice info ioctl |
| 384 | |
| 385 | arg: |
| 386 | pointer to array of subdevice info structures |
| 387 | |
| 388 | reads: |
| 389 | none |
| 390 | |
| 391 | writes: |
| 392 | array of subdevice info structures at arg |
| 393 | |
| 394 | */ |
Bill Pemberton | bd52efb | 2009-03-16 22:06:09 -0400 | [diff] [blame] | 395 | static int do_subdinfo_ioctl(struct comedi_device *dev, struct comedi_subdinfo *arg, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 396 | void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 397 | { |
| 398 | int ret, i; |
Bill Pemberton | bd52efb | 2009-03-16 22:06:09 -0400 | [diff] [blame] | 399 | struct comedi_subdinfo *tmp, *us; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 400 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 401 | |
Bill Pemberton | bd52efb | 2009-03-16 22:06:09 -0400 | [diff] [blame] | 402 | tmp = kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo), GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 403 | if (!tmp) |
| 404 | return -ENOMEM; |
| 405 | |
| 406 | /* fill subdinfo structs */ |
| 407 | for (i = 0; i < dev->n_subdevices; i++) { |
| 408 | s = dev->subdevices + i; |
| 409 | us = tmp + i; |
| 410 | |
| 411 | us->type = s->type; |
| 412 | us->n_chan = s->n_chan; |
| 413 | us->subd_flags = s->subdev_flags; |
| 414 | if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) |
| 415 | us->subd_flags |= SDF_RUNNING; |
| 416 | #define TIMER_nanosec 5 /* backwards compatibility */ |
| 417 | us->timer_type = TIMER_nanosec; |
| 418 | us->len_chanlist = s->len_chanlist; |
| 419 | us->maxdata = s->maxdata; |
| 420 | if (s->range_table) { |
| 421 | us->range_type = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 422 | (i << 24) | (0 << 16) | (s->range_table->length); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 423 | } else { |
| 424 | us->range_type = 0; /* XXX */ |
| 425 | } |
| 426 | us->flags = s->flags; |
| 427 | |
| 428 | if (s->busy) |
| 429 | us->subd_flags |= SDF_BUSY; |
| 430 | if (s->busy == file) |
| 431 | us->subd_flags |= SDF_BUSY_OWNER; |
| 432 | if (s->lock) |
| 433 | us->subd_flags |= SDF_LOCKED; |
| 434 | if (s->lock == file) |
| 435 | us->subd_flags |= SDF_LOCK_OWNER; |
| 436 | if (!s->maxdata && s->maxdata_list) |
| 437 | us->subd_flags |= SDF_MAXDATA; |
| 438 | if (s->flaglist) |
| 439 | us->subd_flags |= SDF_FLAGS; |
| 440 | if (s->range_table_list) |
| 441 | us->subd_flags |= SDF_RANGETYPE; |
| 442 | if (s->do_cmd) |
| 443 | us->subd_flags |= SDF_CMD; |
| 444 | |
| 445 | if (s->insn_bits != &insn_inval) |
| 446 | us->insn_bits_support = COMEDI_SUPPORTED; |
| 447 | else |
| 448 | us->insn_bits_support = COMEDI_UNSUPPORTED; |
| 449 | |
| 450 | us->settling_time_0 = s->settling_time_0; |
| 451 | } |
| 452 | |
| 453 | ret = copy_to_user(arg, tmp, |
Bill Pemberton | bd52efb | 2009-03-16 22:06:09 -0400 | [diff] [blame] | 454 | dev->n_subdevices * sizeof(struct comedi_subdinfo)); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 455 | |
| 456 | kfree(tmp); |
| 457 | |
| 458 | return ret ? -EFAULT : 0; |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | COMEDI_CHANINFO |
| 463 | subdevice info ioctl |
| 464 | |
| 465 | arg: |
| 466 | pointer to chaninfo structure |
| 467 | |
| 468 | reads: |
| 469 | chaninfo structure at arg |
| 470 | |
| 471 | writes: |
| 472 | arrays at elements of chaninfo structure |
| 473 | |
| 474 | */ |
Bill Pemberton | a18b416 | 2009-03-16 22:06:04 -0400 | [diff] [blame] | 475 | static int do_chaninfo_ioctl(struct comedi_device *dev, struct comedi_chaninfo *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 476 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 477 | struct comedi_subdevice *s; |
Bill Pemberton | a18b416 | 2009-03-16 22:06:04 -0400 | [diff] [blame] | 478 | struct comedi_chaninfo it; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 479 | |
Bill Pemberton | a18b416 | 2009-03-16 22:06:04 -0400 | [diff] [blame] | 480 | if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 481 | return -EFAULT; |
| 482 | |
| 483 | if (it.subdev >= dev->n_subdevices) |
| 484 | return -EINVAL; |
| 485 | s = dev->subdevices + it.subdev; |
| 486 | |
| 487 | if (it.maxdata_list) { |
| 488 | if (s->maxdata || !s->maxdata_list) |
| 489 | return -EINVAL; |
| 490 | if (copy_to_user(it.maxdata_list, s->maxdata_list, |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 491 | s->n_chan * sizeof(unsigned int))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 492 | return -EFAULT; |
| 493 | } |
| 494 | |
| 495 | if (it.flaglist) { |
| 496 | if (!s->flaglist) |
| 497 | return -EINVAL; |
| 498 | if (copy_to_user(it.flaglist, s->flaglist, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 499 | s->n_chan * sizeof(unsigned int))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 500 | return -EFAULT; |
| 501 | } |
| 502 | |
| 503 | if (it.rangelist) { |
| 504 | int i; |
| 505 | |
| 506 | if (!s->range_table_list) |
| 507 | return -EINVAL; |
| 508 | for (i = 0; i < s->n_chan; i++) { |
| 509 | int x; |
| 510 | |
| 511 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 512 | (s->range_table_list[i]->length); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 513 | put_user(x, it.rangelist + i); |
| 514 | } |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 515 | #if 0 |
| 516 | if (copy_to_user(it.rangelist, s->range_type_list, |
| 517 | s->n_chan*sizeof(unsigned int))) |
| 518 | return -EFAULT; |
| 519 | #endif |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | COMEDI_BUFINFO |
| 527 | buffer information ioctl |
| 528 | |
| 529 | arg: |
| 530 | pointer to bufinfo structure |
| 531 | |
| 532 | reads: |
| 533 | bufinfo at arg |
| 534 | |
| 535 | writes: |
| 536 | modified bufinfo at arg |
| 537 | |
| 538 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 539 | static int do_bufinfo_ioctl(struct comedi_device *dev, void *arg) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 540 | { |
Bill Pemberton | 9aa5339 | 2009-03-16 22:06:42 -0400 | [diff] [blame] | 541 | struct comedi_bufinfo bi; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 542 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 543 | struct comedi_async *async; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 544 | |
Bill Pemberton | 9aa5339 | 2009-03-16 22:06:42 -0400 | [diff] [blame] | 545 | if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 546 | return -EFAULT; |
| 547 | |
| 548 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) |
| 549 | return -EINVAL; |
| 550 | |
| 551 | s = dev->subdevices + bi.subdevice; |
| 552 | async = s->async; |
| 553 | |
| 554 | if (!async) { |
| 555 | DPRINTK("subdevice does not have async capability\n"); |
| 556 | bi.buf_write_ptr = 0; |
| 557 | bi.buf_read_ptr = 0; |
| 558 | bi.buf_write_count = 0; |
| 559 | bi.buf_read_count = 0; |
| 560 | goto copyback; |
| 561 | } |
| 562 | |
| 563 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { |
| 564 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); |
| 565 | comedi_buf_read_free(async, bi.bytes_read); |
| 566 | |
| 567 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 568 | SRF_RUNNING)) |
| 569 | && async->buf_write_count == async->buf_read_count) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 570 | do_become_nonbusy(dev, s); |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { |
| 575 | bi.bytes_written = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 576 | comedi_buf_write_alloc(async, bi.bytes_written); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 577 | comedi_buf_write_free(async, bi.bytes_written); |
| 578 | } |
| 579 | |
| 580 | bi.buf_write_count = async->buf_write_count; |
| 581 | bi.buf_write_ptr = async->buf_write_ptr; |
| 582 | bi.buf_read_count = async->buf_read_count; |
| 583 | bi.buf_read_ptr = async->buf_read_ptr; |
| 584 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 585 | copyback: |
Bill Pemberton | 9aa5339 | 2009-03-16 22:06:42 -0400 | [diff] [blame] | 586 | if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 587 | return -EFAULT; |
| 588 | |
| 589 | return 0; |
| 590 | } |
| 591 | |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 592 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, unsigned int *data, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 593 | void *file); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 594 | /* |
| 595 | * COMEDI_INSNLIST |
| 596 | * synchronous instructions |
| 597 | * |
| 598 | * arg: |
| 599 | * pointer to sync cmd structure |
| 600 | * |
| 601 | * reads: |
| 602 | * sync cmd struct at arg |
| 603 | * instruction list |
| 604 | * data (for writes) |
| 605 | * |
| 606 | * writes: |
| 607 | * data (for reads) |
| 608 | */ |
| 609 | /* arbitrary limits */ |
| 610 | #define MAX_SAMPLES 256 |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 611 | static int do_insnlist_ioctl(struct comedi_device *dev, void *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 612 | { |
Bill Pemberton | da613f4 | 2009-03-16 22:05:59 -0400 | [diff] [blame] | 613 | struct comedi_insnlist insnlist; |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 614 | struct comedi_insn *insns = NULL; |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 615 | unsigned int *data = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 616 | int i = 0; |
| 617 | int ret = 0; |
| 618 | |
Bill Pemberton | da613f4 | 2009-03-16 22:05:59 -0400 | [diff] [blame] | 619 | if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist))) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 620 | return -EFAULT; |
| 621 | |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 622 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 623 | if (!data) { |
| 624 | DPRINTK("kmalloc failed\n"); |
| 625 | ret = -ENOMEM; |
| 626 | goto error; |
| 627 | } |
| 628 | |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 629 | insns = kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 630 | if (!insns) { |
| 631 | DPRINTK("kmalloc failed\n"); |
| 632 | ret = -ENOMEM; |
| 633 | goto error; |
| 634 | } |
| 635 | |
| 636 | if (copy_from_user(insns, insnlist.insns, |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 637 | sizeof(struct comedi_insn) * insnlist.n_insns)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 638 | DPRINTK("copy_from_user failed\n"); |
| 639 | ret = -EFAULT; |
| 640 | goto error; |
| 641 | } |
| 642 | |
| 643 | for (i = 0; i < insnlist.n_insns; i++) { |
| 644 | if (insns[i].n > MAX_SAMPLES) { |
| 645 | DPRINTK("number of samples too large\n"); |
| 646 | ret = -EINVAL; |
| 647 | goto error; |
| 648 | } |
| 649 | if (insns[i].insn & INSN_MASK_WRITE) { |
| 650 | if (copy_from_user(data, insns[i].data, |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 651 | insns[i].n * sizeof(unsigned int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 652 | DPRINTK("copy_from_user failed\n"); |
| 653 | ret = -EFAULT; |
| 654 | goto error; |
| 655 | } |
| 656 | } |
| 657 | ret = parse_insn(dev, insns + i, data, file); |
| 658 | if (ret < 0) |
| 659 | goto error; |
| 660 | if (insns[i].insn & INSN_MASK_READ) { |
| 661 | if (copy_to_user(insns[i].data, data, |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 662 | insns[i].n * sizeof(unsigned int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 663 | DPRINTK("copy_to_user failed\n"); |
| 664 | ret = -EFAULT; |
| 665 | goto error; |
| 666 | } |
| 667 | } |
| 668 | if (need_resched()) |
| 669 | schedule(); |
| 670 | } |
| 671 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 672 | error: |
| 673 | kfree(insns); |
| 674 | kfree(data); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 675 | |
| 676 | if (ret < 0) |
| 677 | return ret; |
| 678 | return i; |
| 679 | } |
| 680 | |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 681 | static int check_insn_config_length(struct comedi_insn *insn, unsigned int *data) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 682 | { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 683 | if (insn->n < 1) |
| 684 | return -EINVAL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 685 | |
| 686 | switch (data[0]) { |
| 687 | case INSN_CONFIG_DIO_OUTPUT: |
| 688 | case INSN_CONFIG_DIO_INPUT: |
| 689 | case INSN_CONFIG_DISARM: |
| 690 | case INSN_CONFIG_RESET: |
| 691 | if (insn->n == 1) |
| 692 | return 0; |
| 693 | break; |
| 694 | case INSN_CONFIG_ARM: |
| 695 | case INSN_CONFIG_DIO_QUERY: |
| 696 | case INSN_CONFIG_BLOCK_SIZE: |
| 697 | case INSN_CONFIG_FILTER: |
| 698 | case INSN_CONFIG_SERIAL_CLOCK: |
| 699 | case INSN_CONFIG_BIDIRECTIONAL_DATA: |
| 700 | case INSN_CONFIG_ALT_SOURCE: |
| 701 | case INSN_CONFIG_SET_COUNTER_MODE: |
| 702 | case INSN_CONFIG_8254_READ_STATUS: |
| 703 | case INSN_CONFIG_SET_ROUTING: |
| 704 | case INSN_CONFIG_GET_ROUTING: |
| 705 | case INSN_CONFIG_GET_PWM_STATUS: |
| 706 | case INSN_CONFIG_PWM_SET_PERIOD: |
| 707 | case INSN_CONFIG_PWM_GET_PERIOD: |
| 708 | if (insn->n == 2) |
| 709 | return 0; |
| 710 | break; |
| 711 | case INSN_CONFIG_SET_GATE_SRC: |
| 712 | case INSN_CONFIG_GET_GATE_SRC: |
| 713 | case INSN_CONFIG_SET_CLOCK_SRC: |
| 714 | case INSN_CONFIG_GET_CLOCK_SRC: |
| 715 | case INSN_CONFIG_SET_OTHER_SRC: |
| 716 | case INSN_CONFIG_GET_COUNTER_STATUS: |
| 717 | case INSN_CONFIG_PWM_SET_H_BRIDGE: |
| 718 | case INSN_CONFIG_PWM_GET_H_BRIDGE: |
| 719 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: |
| 720 | if (insn->n == 3) |
| 721 | return 0; |
| 722 | break; |
| 723 | case INSN_CONFIG_PWM_OUTPUT: |
| 724 | case INSN_CONFIG_ANALOG_TRIG: |
| 725 | if (insn->n == 5) |
| 726 | return 0; |
| 727 | break; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 728 | /* by default we allow the insn since we don't have checks for |
| 729 | * all possible cases yet */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 730 | default: |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 731 | printk("comedi: no check for data length of config insn id " |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 732 | "%i is implemented.\n" |
| 733 | " Add a check to %s in %s.\n" |
| 734 | " Assuming n=%i is correct.\n", data[0], __func__, |
| 735 | __FILE__, insn->n); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 736 | return 0; |
| 737 | break; |
| 738 | } |
| 739 | return -EINVAL; |
| 740 | } |
| 741 | |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 742 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, unsigned int *data, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 743 | void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 744 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 745 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 746 | int ret = 0; |
| 747 | int i; |
| 748 | |
| 749 | if (insn->insn & INSN_MASK_SPECIAL) { |
| 750 | /* a non-subdevice instruction */ |
| 751 | |
| 752 | switch (insn->insn) { |
| 753 | case INSN_GTOD: |
| 754 | { |
| 755 | struct timeval tv; |
| 756 | |
| 757 | if (insn->n != 2) { |
| 758 | ret = -EINVAL; |
| 759 | break; |
| 760 | } |
| 761 | |
| 762 | do_gettimeofday(&tv); |
| 763 | data[0] = tv.tv_sec; |
| 764 | data[1] = tv.tv_usec; |
| 765 | ret = 2; |
| 766 | |
| 767 | break; |
| 768 | } |
| 769 | case INSN_WAIT: |
| 770 | if (insn->n != 1 || data[0] >= 100000) { |
| 771 | ret = -EINVAL; |
| 772 | break; |
| 773 | } |
| 774 | udelay(data[0] / 1000); |
| 775 | ret = 1; |
| 776 | break; |
| 777 | case INSN_INTTRIG: |
| 778 | if (insn->n != 1) { |
| 779 | ret = -EINVAL; |
| 780 | break; |
| 781 | } |
| 782 | if (insn->subdev >= dev->n_subdevices) { |
| 783 | DPRINTK("%d not usable subdevice\n", |
| 784 | insn->subdev); |
| 785 | ret = -EINVAL; |
| 786 | break; |
| 787 | } |
| 788 | s = dev->subdevices + insn->subdev; |
| 789 | if (!s->async) { |
| 790 | DPRINTK("no async\n"); |
| 791 | ret = -EINVAL; |
| 792 | break; |
| 793 | } |
| 794 | if (!s->async->inttrig) { |
| 795 | DPRINTK("no inttrig\n"); |
| 796 | ret = -EAGAIN; |
| 797 | break; |
| 798 | } |
| 799 | ret = s->async->inttrig(dev, s, insn->data[0]); |
| 800 | if (ret >= 0) |
| 801 | ret = 1; |
| 802 | break; |
| 803 | default: |
| 804 | DPRINTK("invalid insn\n"); |
| 805 | ret = -EINVAL; |
| 806 | break; |
| 807 | } |
| 808 | } else { |
| 809 | /* a subdevice instruction */ |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 810 | unsigned int maxdata; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 811 | |
| 812 | if (insn->subdev >= dev->n_subdevices) { |
| 813 | DPRINTK("subdevice %d out of range\n", insn->subdev); |
| 814 | ret = -EINVAL; |
| 815 | goto out; |
| 816 | } |
| 817 | s = dev->subdevices + insn->subdev; |
| 818 | |
| 819 | if (s->type == COMEDI_SUBD_UNUSED) { |
| 820 | DPRINTK("%d not usable subdevice\n", insn->subdev); |
| 821 | ret = -EIO; |
| 822 | goto out; |
| 823 | } |
| 824 | |
| 825 | /* are we locked? (ioctl lock) */ |
| 826 | if (s->lock && s->lock != file) { |
| 827 | DPRINTK("device locked\n"); |
| 828 | ret = -EACCES; |
| 829 | goto out; |
| 830 | } |
| 831 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 832 | ret = check_chanlist(s, 1, &insn->chanspec); |
| 833 | if (ret < 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 834 | ret = -EINVAL; |
| 835 | DPRINTK("bad chanspec\n"); |
| 836 | goto out; |
| 837 | } |
| 838 | |
| 839 | if (s->busy) { |
| 840 | ret = -EBUSY; |
| 841 | goto out; |
| 842 | } |
| 843 | /* This looks arbitrary. It is. */ |
| 844 | s->busy = &parse_insn; |
| 845 | switch (insn->insn) { |
| 846 | case INSN_READ: |
| 847 | ret = s->insn_read(dev, s, insn, data); |
| 848 | break; |
| 849 | case INSN_WRITE: |
| 850 | maxdata = s->maxdata_list |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 851 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
| 852 | : s->maxdata; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 853 | for (i = 0; i < insn->n; ++i) { |
| 854 | if (data[i] > maxdata) { |
| 855 | ret = -EINVAL; |
| 856 | DPRINTK("bad data value(s)\n"); |
| 857 | break; |
| 858 | } |
| 859 | } |
| 860 | if (ret == 0) |
| 861 | ret = s->insn_write(dev, s, insn, data); |
| 862 | break; |
| 863 | case INSN_BITS: |
| 864 | if (insn->n != 2) { |
| 865 | ret = -EINVAL; |
| 866 | break; |
| 867 | } |
| 868 | ret = s->insn_bits(dev, s, insn, data); |
| 869 | break; |
| 870 | case INSN_CONFIG: |
| 871 | ret = check_insn_config_length(insn, data); |
| 872 | if (ret) |
| 873 | break; |
| 874 | ret = s->insn_config(dev, s, insn, data); |
| 875 | break; |
| 876 | default: |
| 877 | ret = -EINVAL; |
| 878 | break; |
| 879 | } |
| 880 | |
| 881 | s->busy = NULL; |
| 882 | } |
| 883 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 884 | out: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 885 | return ret; |
| 886 | } |
| 887 | |
| 888 | /* |
| 889 | * COMEDI_INSN |
| 890 | * synchronous instructions |
| 891 | * |
| 892 | * arg: |
| 893 | * pointer to insn |
| 894 | * |
| 895 | * reads: |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 896 | * struct comedi_insn struct at arg |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 897 | * data (for writes) |
| 898 | * |
| 899 | * writes: |
| 900 | * data (for reads) |
| 901 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 902 | static int do_insn_ioctl(struct comedi_device *dev, void *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 903 | { |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 904 | struct comedi_insn insn; |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 905 | unsigned int *data = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 906 | int ret = 0; |
| 907 | |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 908 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 909 | if (!data) { |
| 910 | ret = -ENOMEM; |
| 911 | goto error; |
| 912 | } |
| 913 | |
Bill Pemberton | 90035c0 | 2009-03-16 22:05:53 -0400 | [diff] [blame] | 914 | if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 915 | ret = -EFAULT; |
| 916 | goto error; |
| 917 | } |
| 918 | |
| 919 | /* This is where the behavior of insn and insnlist deviate. */ |
| 920 | if (insn.n > MAX_SAMPLES) |
| 921 | insn.n = MAX_SAMPLES; |
| 922 | if (insn.insn & INSN_MASK_WRITE) { |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 923 | if (copy_from_user(data, insn.data, insn.n * sizeof(unsigned int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 924 | ret = -EFAULT; |
| 925 | goto error; |
| 926 | } |
| 927 | } |
| 928 | ret = parse_insn(dev, &insn, data, file); |
| 929 | if (ret < 0) |
| 930 | goto error; |
| 931 | if (insn.insn & INSN_MASK_READ) { |
Bill Pemberton | 790c554 | 2009-03-16 22:05:02 -0400 | [diff] [blame] | 932 | if (copy_to_user(insn.data, data, insn.n * sizeof(unsigned int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 933 | ret = -EFAULT; |
| 934 | goto error; |
| 935 | } |
| 936 | } |
| 937 | ret = insn.n; |
| 938 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 939 | error: |
| 940 | kfree(data); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 941 | |
| 942 | return ret; |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | COMEDI_CMD |
| 947 | command ioctl |
| 948 | |
| 949 | arg: |
| 950 | pointer to cmd structure |
| 951 | |
| 952 | reads: |
| 953 | cmd structure at arg |
| 954 | channel/range list |
| 955 | |
| 956 | writes: |
| 957 | modified cmd structure at arg |
| 958 | |
| 959 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 960 | static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 961 | { |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 962 | struct comedi_cmd user_cmd; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 963 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 964 | struct comedi_async *async; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 965 | int ret = 0; |
| 966 | unsigned int *chanlist_saver = NULL; |
| 967 | |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 968 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 969 | DPRINTK("bad cmd address\n"); |
| 970 | return -EFAULT; |
| 971 | } |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 972 | /* save user's chanlist pointer so it can be restored later */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 973 | chanlist_saver = user_cmd.chanlist; |
| 974 | |
| 975 | if (user_cmd.subdev >= dev->n_subdevices) { |
| 976 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); |
| 977 | return -ENODEV; |
| 978 | } |
| 979 | |
| 980 | s = dev->subdevices + user_cmd.subdev; |
| 981 | async = s->async; |
| 982 | |
| 983 | if (s->type == COMEDI_SUBD_UNUSED) { |
| 984 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); |
| 985 | return -EIO; |
| 986 | } |
| 987 | |
| 988 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { |
| 989 | DPRINTK("subdevice %i does not support commands\n", |
| 990 | user_cmd.subdev); |
| 991 | return -EIO; |
| 992 | } |
| 993 | |
| 994 | /* are we locked? (ioctl lock) */ |
| 995 | if (s->lock && s->lock != file) { |
| 996 | DPRINTK("subdevice locked\n"); |
| 997 | return -EACCES; |
| 998 | } |
| 999 | |
| 1000 | /* are we busy? */ |
| 1001 | if (s->busy) { |
| 1002 | DPRINTK("subdevice busy\n"); |
| 1003 | return -EBUSY; |
| 1004 | } |
| 1005 | s->busy = file; |
| 1006 | |
| 1007 | /* make sure channel/gain list isn't too long */ |
| 1008 | if (user_cmd.chanlist_len > s->len_chanlist) { |
| 1009 | DPRINTK("channel/gain list too long %u > %d\n", |
| 1010 | user_cmd.chanlist_len, s->len_chanlist); |
| 1011 | ret = -EINVAL; |
| 1012 | goto cleanup; |
| 1013 | } |
| 1014 | |
| 1015 | /* make sure channel/gain list isn't too short */ |
| 1016 | if (user_cmd.chanlist_len < 1) { |
| 1017 | DPRINTK("channel/gain list too short %u < 1\n", |
| 1018 | user_cmd.chanlist_len); |
| 1019 | ret = -EINVAL; |
| 1020 | goto cleanup; |
| 1021 | } |
| 1022 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1023 | kfree(async->cmd.chanlist); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1024 | async->cmd = user_cmd; |
| 1025 | async->cmd.data = NULL; |
| 1026 | /* load channel/gain list */ |
| 1027 | async->cmd.chanlist = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1028 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1029 | if (!async->cmd.chanlist) { |
| 1030 | DPRINTK("allocation failed\n"); |
| 1031 | ret = -ENOMEM; |
| 1032 | goto cleanup; |
| 1033 | } |
| 1034 | |
| 1035 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1036 | async->cmd.chanlist_len * sizeof(int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1037 | DPRINTK("fault reading chanlist\n"); |
| 1038 | ret = -EFAULT; |
| 1039 | goto cleanup; |
| 1040 | } |
| 1041 | |
| 1042 | /* make sure each element in channel/gain list is valid */ |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1043 | ret = check_chanlist(s, async->cmd.chanlist_len, async->cmd.chanlist); |
| 1044 | if (ret < 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1045 | DPRINTK("bad chanlist\n"); |
| 1046 | goto cleanup; |
| 1047 | } |
| 1048 | |
| 1049 | ret = s->do_cmdtest(dev, s, &async->cmd); |
| 1050 | |
| 1051 | if (async->cmd.flags & TRIG_BOGUS || ret) { |
| 1052 | DPRINTK("test returned %d\n", ret); |
| 1053 | user_cmd = async->cmd; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1054 | /* restore chanlist pointer before copying back */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1055 | user_cmd.chanlist = chanlist_saver; |
| 1056 | user_cmd.data = NULL; |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 1057 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1058 | DPRINTK("fault writing cmd\n"); |
| 1059 | ret = -EFAULT; |
| 1060 | goto cleanup; |
| 1061 | } |
| 1062 | ret = -EAGAIN; |
| 1063 | goto cleanup; |
| 1064 | } |
| 1065 | |
| 1066 | if (!async->prealloc_bufsz) { |
| 1067 | ret = -ENOMEM; |
| 1068 | DPRINTK("no buffer (?)\n"); |
| 1069 | goto cleanup; |
| 1070 | } |
| 1071 | |
| 1072 | comedi_reset_async_buf(async); |
| 1073 | |
| 1074 | async->cb_mask = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1075 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
| 1076 | COMEDI_CB_OVERFLOW; |
| 1077 | if (async->cmd.flags & TRIG_WAKE_EOS) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1078 | async->cb_mask |= COMEDI_CB_EOS; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1079 | |
| 1080 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); |
| 1081 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1082 | ret = s->do_cmd(dev, s); |
| 1083 | if (ret == 0) |
| 1084 | return 0; |
| 1085 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1086 | cleanup: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1087 | do_become_nonbusy(dev, s); |
| 1088 | |
| 1089 | return ret; |
| 1090 | } |
| 1091 | |
| 1092 | /* |
| 1093 | COMEDI_CMDTEST |
| 1094 | command testing ioctl |
| 1095 | |
| 1096 | arg: |
| 1097 | pointer to cmd structure |
| 1098 | |
| 1099 | reads: |
| 1100 | cmd structure at arg |
| 1101 | channel/range list |
| 1102 | |
| 1103 | writes: |
| 1104 | modified cmd structure at arg |
| 1105 | |
| 1106 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1107 | static int do_cmdtest_ioctl(struct comedi_device *dev, void *arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1108 | { |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 1109 | struct comedi_cmd user_cmd; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1110 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1111 | int ret = 0; |
| 1112 | unsigned int *chanlist = NULL; |
| 1113 | unsigned int *chanlist_saver = NULL; |
| 1114 | |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 1115 | if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1116 | DPRINTK("bad cmd address\n"); |
| 1117 | return -EFAULT; |
| 1118 | } |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1119 | /* save user's chanlist pointer so it can be restored later */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1120 | chanlist_saver = user_cmd.chanlist; |
| 1121 | |
| 1122 | if (user_cmd.subdev >= dev->n_subdevices) { |
| 1123 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); |
| 1124 | return -ENODEV; |
| 1125 | } |
| 1126 | |
| 1127 | s = dev->subdevices + user_cmd.subdev; |
| 1128 | if (s->type == COMEDI_SUBD_UNUSED) { |
| 1129 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); |
| 1130 | return -EIO; |
| 1131 | } |
| 1132 | |
| 1133 | if (!s->do_cmd || !s->do_cmdtest) { |
| 1134 | DPRINTK("subdevice %i does not support commands\n", |
| 1135 | user_cmd.subdev); |
| 1136 | return -EIO; |
| 1137 | } |
| 1138 | |
| 1139 | /* make sure channel/gain list isn't too long */ |
| 1140 | if (user_cmd.chanlist_len > s->len_chanlist) { |
| 1141 | DPRINTK("channel/gain list too long %d > %d\n", |
| 1142 | user_cmd.chanlist_len, s->len_chanlist); |
| 1143 | ret = -EINVAL; |
| 1144 | goto cleanup; |
| 1145 | } |
| 1146 | |
| 1147 | /* load channel/gain list */ |
| 1148 | if (user_cmd.chanlist) { |
| 1149 | chanlist = |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1150 | kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1151 | if (!chanlist) { |
| 1152 | DPRINTK("allocation failed\n"); |
| 1153 | ret = -ENOMEM; |
| 1154 | goto cleanup; |
| 1155 | } |
| 1156 | |
| 1157 | if (copy_from_user(chanlist, user_cmd.chanlist, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1158 | user_cmd.chanlist_len * sizeof(int))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1159 | DPRINTK("fault reading chanlist\n"); |
| 1160 | ret = -EFAULT; |
| 1161 | goto cleanup; |
| 1162 | } |
| 1163 | |
| 1164 | /* make sure each element in channel/gain list is valid */ |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1165 | ret = check_chanlist(s, user_cmd.chanlist_len, chanlist); |
| 1166 | if (ret < 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1167 | DPRINTK("bad chanlist\n"); |
| 1168 | goto cleanup; |
| 1169 | } |
| 1170 | |
| 1171 | user_cmd.chanlist = chanlist; |
| 1172 | } |
| 1173 | |
| 1174 | ret = s->do_cmdtest(dev, s, &user_cmd); |
| 1175 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1176 | /* restore chanlist pointer before copying back */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1177 | user_cmd.chanlist = chanlist_saver; |
| 1178 | |
Bill Pemberton | ea6d0d4 | 2009-03-16 22:05:47 -0400 | [diff] [blame] | 1179 | if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1180 | DPRINTK("bad cmd address\n"); |
| 1181 | ret = -EFAULT; |
| 1182 | goto cleanup; |
| 1183 | } |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1184 | cleanup: |
| 1185 | kfree(chanlist); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1186 | |
| 1187 | return ret; |
| 1188 | } |
| 1189 | |
| 1190 | /* |
| 1191 | COMEDI_LOCK |
| 1192 | lock subdevice |
| 1193 | |
| 1194 | arg: |
| 1195 | subdevice number |
| 1196 | |
| 1197 | reads: |
| 1198 | none |
| 1199 | |
| 1200 | writes: |
| 1201 | none |
| 1202 | |
| 1203 | */ |
| 1204 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1205 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1206 | { |
| 1207 | int ret = 0; |
| 1208 | unsigned long flags; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1209 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1210 | |
| 1211 | if (arg >= dev->n_subdevices) |
| 1212 | return -EINVAL; |
| 1213 | s = dev->subdevices + arg; |
| 1214 | |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 1215 | spin_lock_irqsave(&s->spin_lock, flags); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1216 | if (s->busy || s->lock) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1217 | ret = -EBUSY; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1218 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1219 | s->lock = file; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 1220 | spin_unlock_irqrestore(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1221 | |
| 1222 | if (ret < 0) |
| 1223 | return ret; |
| 1224 | |
| 1225 | #if 0 |
| 1226 | if (s->lock_f) |
| 1227 | ret = s->lock_f(dev, s); |
| 1228 | #endif |
| 1229 | |
| 1230 | return ret; |
| 1231 | } |
| 1232 | |
| 1233 | /* |
| 1234 | COMEDI_UNLOCK |
| 1235 | unlock subdevice |
| 1236 | |
| 1237 | arg: |
| 1238 | subdevice number |
| 1239 | |
| 1240 | reads: |
| 1241 | none |
| 1242 | |
| 1243 | writes: |
| 1244 | none |
| 1245 | |
| 1246 | This function isn't protected by the semaphore, since |
| 1247 | we already own the lock. |
| 1248 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1249 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1250 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1251 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1252 | |
| 1253 | if (arg >= dev->n_subdevices) |
| 1254 | return -EINVAL; |
| 1255 | s = dev->subdevices + arg; |
| 1256 | |
| 1257 | if (s->busy) |
| 1258 | return -EBUSY; |
| 1259 | |
| 1260 | if (s->lock && s->lock != file) |
| 1261 | return -EACCES; |
| 1262 | |
| 1263 | if (s->lock == file) { |
| 1264 | #if 0 |
| 1265 | if (s->unlock) |
| 1266 | s->unlock(dev, s); |
| 1267 | #endif |
| 1268 | |
| 1269 | s->lock = NULL; |
| 1270 | } |
| 1271 | |
| 1272 | return 0; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | COMEDI_CANCEL |
| 1277 | cancel acquisition ioctl |
| 1278 | |
| 1279 | arg: |
| 1280 | subdevice number |
| 1281 | |
| 1282 | reads: |
| 1283 | nothing |
| 1284 | |
| 1285 | writes: |
| 1286 | nothing |
| 1287 | |
| 1288 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1289 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1290 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1291 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1292 | |
| 1293 | if (arg >= dev->n_subdevices) |
| 1294 | return -EINVAL; |
| 1295 | s = dev->subdevices + arg; |
| 1296 | if (s->async == NULL) |
| 1297 | return -EINVAL; |
| 1298 | |
| 1299 | if (s->lock && s->lock != file) |
| 1300 | return -EACCES; |
| 1301 | |
| 1302 | if (!s->busy) |
| 1303 | return 0; |
| 1304 | |
| 1305 | if (s->busy != file) |
| 1306 | return -EBUSY; |
| 1307 | |
| 1308 | return do_cancel(dev, s); |
| 1309 | } |
| 1310 | |
| 1311 | /* |
| 1312 | COMEDI_POLL ioctl |
| 1313 | instructs driver to synchronize buffers |
| 1314 | |
| 1315 | arg: |
| 1316 | subdevice number |
| 1317 | |
| 1318 | reads: |
| 1319 | nothing |
| 1320 | |
| 1321 | writes: |
| 1322 | nothing |
| 1323 | |
| 1324 | */ |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1325 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, void *file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1326 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1327 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1328 | |
| 1329 | if (arg >= dev->n_subdevices) |
| 1330 | return -EINVAL; |
| 1331 | s = dev->subdevices + arg; |
| 1332 | |
| 1333 | if (s->lock && s->lock != file) |
| 1334 | return -EACCES; |
| 1335 | |
| 1336 | if (!s->busy) |
| 1337 | return 0; |
| 1338 | |
| 1339 | if (s->busy != file) |
| 1340 | return -EBUSY; |
| 1341 | |
| 1342 | if (s->poll) |
| 1343 | return s->poll(dev, s); |
| 1344 | |
| 1345 | return -EINVAL; |
| 1346 | } |
| 1347 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1348 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1349 | { |
| 1350 | int ret = 0; |
| 1351 | |
| 1352 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) |
| 1353 | ret = s->cancel(dev, s); |
| 1354 | |
| 1355 | do_become_nonbusy(dev, s); |
| 1356 | |
| 1357 | return ret; |
| 1358 | } |
| 1359 | |
| 1360 | void comedi_unmap(struct vm_area_struct *area) |
| 1361 | { |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1362 | struct comedi_async *async; |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1363 | struct comedi_device *dev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1364 | |
| 1365 | async = area->vm_private_data; |
| 1366 | dev = async->subdevice->device; |
| 1367 | |
| 1368 | mutex_lock(&dev->mutex); |
| 1369 | async->mmap_count--; |
| 1370 | mutex_unlock(&dev->mutex); |
| 1371 | } |
| 1372 | |
| 1373 | static struct vm_operations_struct comedi_vm_ops = { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1374 | .close = comedi_unmap, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1375 | }; |
| 1376 | |
| 1377 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) |
| 1378 | { |
| 1379 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1380 | struct comedi_device_file_info *dev_file_info = |
| 1381 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1382 | struct comedi_device *dev = dev_file_info->device; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1383 | struct comedi_async *async = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1384 | unsigned long start = vma->vm_start; |
| 1385 | unsigned long size; |
| 1386 | int n_pages; |
| 1387 | int i; |
| 1388 | int retval; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1389 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1390 | |
| 1391 | mutex_lock(&dev->mutex); |
| 1392 | if (!dev->attached) { |
| 1393 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1394 | retval = -ENODEV; |
| 1395 | goto done; |
| 1396 | } |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1397 | if (vma->vm_flags & VM_WRITE) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1398 | s = comedi_get_write_subdevice(dev_file_info); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1399 | else |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1400 | s = comedi_get_read_subdevice(dev_file_info); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1401 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1402 | if (s == NULL) { |
| 1403 | retval = -EINVAL; |
| 1404 | goto done; |
| 1405 | } |
| 1406 | async = s->async; |
| 1407 | if (async == NULL) { |
| 1408 | retval = -EINVAL; |
| 1409 | goto done; |
| 1410 | } |
| 1411 | |
| 1412 | if (vma->vm_pgoff != 0) { |
| 1413 | DPRINTK("comedi: mmap() offset must be 0.\n"); |
| 1414 | retval = -EINVAL; |
| 1415 | goto done; |
| 1416 | } |
| 1417 | |
| 1418 | size = vma->vm_end - vma->vm_start; |
| 1419 | if (size > async->prealloc_bufsz) { |
| 1420 | retval = -EFAULT; |
| 1421 | goto done; |
| 1422 | } |
| 1423 | if (size & (~PAGE_MASK)) { |
| 1424 | retval = -EFAULT; |
| 1425 | goto done; |
| 1426 | } |
| 1427 | |
| 1428 | n_pages = size >> PAGE_SHIFT; |
| 1429 | for (i = 0; i < n_pages; ++i) { |
| 1430 | if (remap_pfn_range(vma, start, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1431 | page_to_pfn(virt_to_page(async-> |
| 1432 | buf_page_list[i]. |
| 1433 | virt_addr)), |
| 1434 | PAGE_SIZE, PAGE_SHARED)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1435 | retval = -EAGAIN; |
| 1436 | goto done; |
| 1437 | } |
| 1438 | start += PAGE_SIZE; |
| 1439 | } |
| 1440 | |
| 1441 | vma->vm_ops = &comedi_vm_ops; |
| 1442 | vma->vm_private_data = async; |
| 1443 | |
| 1444 | async->mmap_count++; |
| 1445 | |
| 1446 | retval = 0; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1447 | done: |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1448 | mutex_unlock(&dev->mutex); |
| 1449 | return retval; |
| 1450 | } |
| 1451 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1452 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1453 | { |
| 1454 | unsigned int mask = 0; |
| 1455 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1456 | struct comedi_device_file_info *dev_file_info = |
| 1457 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1458 | struct comedi_device *dev = dev_file_info->device; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1459 | struct comedi_subdevice *read_subdev; |
| 1460 | struct comedi_subdevice *write_subdev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1461 | |
| 1462 | mutex_lock(&dev->mutex); |
| 1463 | if (!dev->attached) { |
| 1464 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1465 | mutex_unlock(&dev->mutex); |
| 1466 | return 0; |
| 1467 | } |
| 1468 | |
| 1469 | mask = 0; |
| 1470 | read_subdev = comedi_get_read_subdevice(dev_file_info); |
| 1471 | if (read_subdev) { |
| 1472 | poll_wait(file, &read_subdev->async->wait_head, wait); |
| 1473 | if (!read_subdev->busy |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1474 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
| 1475 | || !(comedi_get_subdevice_runflags(read_subdev) & |
| 1476 | SRF_RUNNING)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1477 | mask |= POLLIN | POLLRDNORM; |
| 1478 | } |
| 1479 | } |
| 1480 | write_subdev = comedi_get_write_subdevice(dev_file_info); |
| 1481 | if (write_subdev) { |
| 1482 | poll_wait(file, &write_subdev->async->wait_head, wait); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1483 | comedi_buf_write_alloc(write_subdev->async, |
| 1484 | write_subdev->async->prealloc_bufsz); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1485 | if (!write_subdev->busy |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1486 | || !(comedi_get_subdevice_runflags(write_subdev) & |
| 1487 | SRF_RUNNING) |
| 1488 | || comedi_buf_write_n_allocated(write_subdev->async) >= |
| 1489 | bytes_per_sample(write_subdev->async->subdevice)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1490 | mask |= POLLOUT | POLLWRNORM; |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | mutex_unlock(&dev->mutex); |
| 1495 | return mask; |
| 1496 | } |
| 1497 | |
| 1498 | static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1499 | loff_t *offset) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1500 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1501 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1502 | struct comedi_async *async; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1503 | int n, m, count = 0, retval = 0; |
| 1504 | DECLARE_WAITQUEUE(wait, current); |
| 1505 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1506 | struct comedi_device_file_info *dev_file_info = |
| 1507 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1508 | struct comedi_device *dev = dev_file_info->device; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1509 | |
| 1510 | if (!dev->attached) { |
| 1511 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1512 | retval = -ENODEV; |
| 1513 | goto done; |
| 1514 | } |
| 1515 | |
| 1516 | s = comedi_get_write_subdevice(dev_file_info); |
| 1517 | if (s == NULL) { |
| 1518 | retval = -EIO; |
| 1519 | goto done; |
| 1520 | } |
| 1521 | async = s->async; |
| 1522 | |
| 1523 | if (!nbytes) { |
| 1524 | retval = 0; |
| 1525 | goto done; |
| 1526 | } |
| 1527 | if (!s->busy) { |
| 1528 | retval = 0; |
| 1529 | goto done; |
| 1530 | } |
| 1531 | if (s->busy != file) { |
| 1532 | retval = -EACCES; |
| 1533 | goto done; |
| 1534 | } |
| 1535 | add_wait_queue(&async->wait_head, &wait); |
| 1536 | while (nbytes > 0 && !retval) { |
| 1537 | set_current_state(TASK_INTERRUPTIBLE); |
| 1538 | |
| 1539 | n = nbytes; |
| 1540 | |
| 1541 | m = n; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1542 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1543 | m = async->prealloc_bufsz - async->buf_write_ptr; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1544 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1545 | if (m > comedi_buf_write_n_allocated(async)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1546 | m = comedi_buf_write_n_allocated(async); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1547 | if (m < n) |
| 1548 | n = m; |
| 1549 | |
| 1550 | if (n == 0) { |
| 1551 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
| 1552 | if (comedi_get_subdevice_runflags(s) & |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1553 | SRF_ERROR) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1554 | retval = -EPIPE; |
| 1555 | } else { |
| 1556 | retval = 0; |
| 1557 | } |
| 1558 | do_become_nonbusy(dev, s); |
| 1559 | break; |
| 1560 | } |
| 1561 | if (file->f_flags & O_NONBLOCK) { |
| 1562 | retval = -EAGAIN; |
| 1563 | break; |
| 1564 | } |
| 1565 | if (signal_pending(current)) { |
| 1566 | retval = -ERESTARTSYS; |
| 1567 | break; |
| 1568 | } |
| 1569 | schedule(); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1570 | if (!s->busy) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1571 | break; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1572 | if (s->busy != file) { |
| 1573 | retval = -EACCES; |
| 1574 | break; |
| 1575 | } |
| 1576 | continue; |
| 1577 | } |
| 1578 | |
| 1579 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1580 | buf, n); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1581 | if (m) { |
| 1582 | n -= m; |
| 1583 | retval = -EFAULT; |
| 1584 | } |
| 1585 | comedi_buf_write_free(async, n); |
| 1586 | |
| 1587 | count += n; |
| 1588 | nbytes -= n; |
| 1589 | |
| 1590 | buf += n; |
| 1591 | break; /* makes device work like a pipe */ |
| 1592 | } |
| 1593 | set_current_state(TASK_RUNNING); |
| 1594 | remove_wait_queue(&async->wait_head, &wait); |
| 1595 | |
| 1596 | done: |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1597 | return count ? count : retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1598 | } |
| 1599 | |
| 1600 | static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1601 | loff_t *offset) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1602 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1603 | struct comedi_subdevice *s; |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1604 | struct comedi_async *async; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1605 | int n, m, count = 0, retval = 0; |
| 1606 | DECLARE_WAITQUEUE(wait, current); |
| 1607 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1608 | struct comedi_device_file_info *dev_file_info = |
| 1609 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1610 | struct comedi_device *dev = dev_file_info->device; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1611 | |
| 1612 | if (!dev->attached) { |
| 1613 | DPRINTK("no driver configured on comedi%i\n", dev->minor); |
| 1614 | retval = -ENODEV; |
| 1615 | goto done; |
| 1616 | } |
| 1617 | |
| 1618 | s = comedi_get_read_subdevice(dev_file_info); |
| 1619 | if (s == NULL) { |
| 1620 | retval = -EIO; |
| 1621 | goto done; |
| 1622 | } |
| 1623 | async = s->async; |
| 1624 | if (!nbytes) { |
| 1625 | retval = 0; |
| 1626 | goto done; |
| 1627 | } |
| 1628 | if (!s->busy) { |
| 1629 | retval = 0; |
| 1630 | goto done; |
| 1631 | } |
| 1632 | if (s->busy != file) { |
| 1633 | retval = -EACCES; |
| 1634 | goto done; |
| 1635 | } |
| 1636 | |
| 1637 | add_wait_queue(&async->wait_head, &wait); |
| 1638 | while (nbytes > 0 && !retval) { |
| 1639 | set_current_state(TASK_INTERRUPTIBLE); |
| 1640 | |
| 1641 | n = nbytes; |
| 1642 | |
| 1643 | m = comedi_buf_read_n_available(async); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1644 | /* printk("%d available\n",m); */ |
| 1645 | if (async->buf_read_ptr + m > async->prealloc_bufsz) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1646 | m = async->prealloc_bufsz - async->buf_read_ptr; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1647 | /* printk("%d contiguous\n",m); */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1648 | if (m < n) |
| 1649 | n = m; |
| 1650 | |
| 1651 | if (n == 0) { |
| 1652 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { |
| 1653 | do_become_nonbusy(dev, s); |
| 1654 | if (comedi_get_subdevice_runflags(s) & |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1655 | SRF_ERROR) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1656 | retval = -EPIPE; |
| 1657 | } else { |
| 1658 | retval = 0; |
| 1659 | } |
| 1660 | break; |
| 1661 | } |
| 1662 | if (file->f_flags & O_NONBLOCK) { |
| 1663 | retval = -EAGAIN; |
| 1664 | break; |
| 1665 | } |
| 1666 | if (signal_pending(current)) { |
| 1667 | retval = -ERESTARTSYS; |
| 1668 | break; |
| 1669 | } |
| 1670 | schedule(); |
| 1671 | if (!s->busy) { |
| 1672 | retval = 0; |
| 1673 | break; |
| 1674 | } |
| 1675 | if (s->busy != file) { |
| 1676 | retval = -EACCES; |
| 1677 | break; |
| 1678 | } |
| 1679 | continue; |
| 1680 | } |
| 1681 | m = copy_to_user(buf, async->prealloc_buf + |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1682 | async->buf_read_ptr, n); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1683 | if (m) { |
| 1684 | n -= m; |
| 1685 | retval = -EFAULT; |
| 1686 | } |
| 1687 | |
| 1688 | comedi_buf_read_alloc(async, n); |
| 1689 | comedi_buf_read_free(async, n); |
| 1690 | |
| 1691 | count += n; |
| 1692 | nbytes -= n; |
| 1693 | |
| 1694 | buf += n; |
| 1695 | break; /* makes device work like a pipe */ |
| 1696 | } |
| 1697 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1698 | async->buf_read_count - async->buf_write_count == 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1699 | do_become_nonbusy(dev, s); |
| 1700 | } |
| 1701 | set_current_state(TASK_RUNNING); |
| 1702 | remove_wait_queue(&async->wait_head, &wait); |
| 1703 | |
| 1704 | done: |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1705 | return count ? count : retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1706 | } |
| 1707 | |
| 1708 | /* |
| 1709 | This function restores a subdevice to an idle state. |
| 1710 | */ |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1711 | void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1712 | { |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1713 | struct comedi_async *async = s->async; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1714 | |
| 1715 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1716 | if (async) { |
| 1717 | comedi_reset_async_buf(async); |
| 1718 | async->inttrig = NULL; |
| 1719 | } else { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1720 | printk(KERN_ERR |
| 1721 | "BUG: (?) do_become_nonbusy called with async=0\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1722 | } |
| 1723 | |
| 1724 | s->busy = NULL; |
| 1725 | } |
| 1726 | |
| 1727 | static int comedi_open(struct inode *inode, struct file *file) |
| 1728 | { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1729 | const unsigned minor = iminor(inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1730 | struct comedi_device_file_info *dev_file_info = |
| 1731 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1732 | struct comedi_device *dev = dev_file_info ? dev_file_info->device : NULL; |
Ian Abbott | 9792007 | 2009-02-09 16:51:38 +0000 | [diff] [blame] | 1733 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1734 | if (dev == NULL) { |
| 1735 | DPRINTK("invalid minor number\n"); |
| 1736 | return -ENODEV; |
| 1737 | } |
| 1738 | |
| 1739 | /* This is slightly hacky, but we want module autoloading |
| 1740 | * to work for root. |
| 1741 | * case: user opens device, attached -> ok |
| 1742 | * case: user opens device, unattached, in_request_module=0 -> autoload |
| 1743 | * case: user opens device, unattached, in_request_module=1 -> fail |
| 1744 | * case: root opens device, attached -> ok |
| 1745 | * case: root opens device, unattached, in_request_module=1 -> ok |
| 1746 | * (typically called from modprobe) |
| 1747 | * case: root opens device, unattached, in_request_module=0 -> autoload |
| 1748 | * |
| 1749 | * The last could be changed to "-> ok", which would deny root |
| 1750 | * autoloading. |
| 1751 | */ |
| 1752 | mutex_lock(&dev->mutex); |
| 1753 | if (dev->attached) |
| 1754 | goto ok; |
Eric Paris | a8f80e8 | 2009-08-13 09:44:51 -0400 | [diff] [blame^] | 1755 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1756 | DPRINTK("in request module\n"); |
| 1757 | mutex_unlock(&dev->mutex); |
| 1758 | return -ENODEV; |
| 1759 | } |
Eric Paris | a8f80e8 | 2009-08-13 09:44:51 -0400 | [diff] [blame^] | 1760 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1761 | goto ok; |
| 1762 | |
| 1763 | dev->in_request_module = 1; |
| 1764 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1765 | #ifdef CONFIG_KMOD |
| 1766 | mutex_unlock(&dev->mutex); |
Ian Abbott | 56d92c6 | 2009-02-09 16:32:12 +0000 | [diff] [blame] | 1767 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1768 | mutex_lock(&dev->mutex); |
| 1769 | #endif |
| 1770 | |
| 1771 | dev->in_request_module = 0; |
| 1772 | |
Eric Paris | a8f80e8 | 2009-08-13 09:44:51 -0400 | [diff] [blame^] | 1773 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
| 1774 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1775 | mutex_unlock(&dev->mutex); |
| 1776 | return -ENODEV; |
| 1777 | } |
| 1778 | ok: |
| 1779 | __module_get(THIS_MODULE); |
| 1780 | |
| 1781 | if (dev->attached) { |
| 1782 | if (!try_module_get(dev->driver->module)) { |
| 1783 | module_put(THIS_MODULE); |
| 1784 | mutex_unlock(&dev->mutex); |
| 1785 | return -ENOSYS; |
| 1786 | } |
| 1787 | } |
| 1788 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1789 | if (dev->attached && dev->use_count == 0 && dev->open) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1790 | dev->open(dev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1791 | |
| 1792 | dev->use_count++; |
| 1793 | |
| 1794 | mutex_unlock(&dev->mutex); |
| 1795 | |
| 1796 | return 0; |
| 1797 | } |
| 1798 | |
| 1799 | static int comedi_close(struct inode *inode, struct file *file) |
| 1800 | { |
| 1801 | const unsigned minor = iminor(inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1802 | struct comedi_device_file_info *dev_file_info = |
| 1803 | comedi_get_device_file_info(minor); |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1804 | struct comedi_device *dev = dev_file_info->device; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1805 | struct comedi_subdevice *s = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1806 | int i; |
| 1807 | |
| 1808 | mutex_lock(&dev->mutex); |
| 1809 | |
| 1810 | if (dev->subdevices) { |
| 1811 | for (i = 0; i < dev->n_subdevices; i++) { |
| 1812 | s = dev->subdevices + i; |
| 1813 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1814 | if (s->busy == file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1815 | do_cancel(dev, s); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1816 | if (s->lock == file) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1817 | s->lock = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1818 | } |
| 1819 | } |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1820 | if (dev->attached && dev->use_count == 1 && dev->close) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1821 | dev->close(dev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1822 | |
| 1823 | module_put(THIS_MODULE); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1824 | if (dev->attached) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1825 | module_put(dev->driver->module); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1826 | |
| 1827 | dev->use_count--; |
| 1828 | |
| 1829 | mutex_unlock(&dev->mutex); |
| 1830 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1831 | if (file->f_flags & FASYNC) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1832 | comedi_fasync(-1, file, 0); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1833 | |
| 1834 | return 0; |
| 1835 | } |
| 1836 | |
| 1837 | static int comedi_fasync(int fd, struct file *file, int on) |
| 1838 | { |
| 1839 | const unsigned minor = iminor(file->f_dentry->d_inode); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1840 | struct comedi_device_file_info *dev_file_info = |
| 1841 | comedi_get_device_file_info(minor); |
| 1842 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1843 | struct comedi_device *dev = dev_file_info->device; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1844 | |
| 1845 | return fasync_helper(fd, file, on, &dev->async_queue); |
| 1846 | } |
| 1847 | |
| 1848 | const struct file_operations comedi_fops = { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1849 | .owner = THIS_MODULE, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1850 | #ifdef HAVE_UNLOCKED_IOCTL |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1851 | .unlocked_ioctl = comedi_unlocked_ioctl, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1852 | #else |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1853 | .ioctl = comedi_ioctl, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1854 | #endif |
| 1855 | #ifdef HAVE_COMPAT_IOCTL |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1856 | .compat_ioctl = comedi_compat_ioctl, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1857 | #endif |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1858 | .open = comedi_open, |
| 1859 | .release = comedi_close, |
| 1860 | .read = comedi_read, |
| 1861 | .write = comedi_write, |
| 1862 | .mmap = comedi_mmap, |
| 1863 | .poll = comedi_poll, |
| 1864 | .fasync = comedi_fasync, |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1865 | }; |
| 1866 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1867 | struct class *comedi_class; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1868 | static struct cdev comedi_cdev; |
| 1869 | |
| 1870 | static void comedi_cleanup_legacy_minors(void) |
| 1871 | { |
| 1872 | unsigned i; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1873 | |
Bernd Porr | 1dd33ab | 2008-12-08 23:30:13 +0000 | [diff] [blame] | 1874 | for (i = 0; i < comedi_num_legacy_minors; i++) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1875 | comedi_free_board_minor(i); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1876 | } |
| 1877 | |
| 1878 | static int __init comedi_init(void) |
| 1879 | { |
| 1880 | int i; |
| 1881 | int retval; |
| 1882 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1883 | printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
| 1884 | " - http://www.comedi.org\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1885 | |
Frank Mori Hess | a3cb729 | 2008-12-15 13:44:45 +0000 | [diff] [blame] | 1886 | if (comedi_num_legacy_minors < 0 || |
| 1887 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { |
| 1888 | printk(KERN_ERR "comedi: error: invalid value for module " |
| 1889 | "parameter \"comedi_num_legacy_minors\". Valid values " |
| 1890 | "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS); |
| 1891 | return -EINVAL; |
| 1892 | } |
| 1893 | |
| 1894 | /* |
| 1895 | * comedi is unusable if both comedi_autoconfig and |
| 1896 | * comedi_num_legacy_minors are zero, so we might as well adjust the |
| 1897 | * defaults in that case |
| 1898 | */ |
| 1899 | if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0) |
| 1900 | comedi_num_legacy_minors = 16; |
| 1901 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1902 | memset(comedi_file_info_table, 0, |
| 1903 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1904 | |
| 1905 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1906 | COMEDI_NUM_MINORS, "comedi"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1907 | if (retval) |
| 1908 | return -EIO; |
| 1909 | cdev_init(&comedi_cdev, &comedi_fops); |
| 1910 | comedi_cdev.owner = THIS_MODULE; |
| 1911 | kobject_set_name(&comedi_cdev.kobj, "comedi"); |
| 1912 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
| 1913 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1914 | COMEDI_NUM_MINORS); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1915 | return -EIO; |
| 1916 | } |
| 1917 | comedi_class = class_create(THIS_MODULE, "comedi"); |
| 1918 | if (IS_ERR(comedi_class)) { |
| 1919 | printk("comedi: failed to create class"); |
| 1920 | cdev_del(&comedi_cdev); |
| 1921 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1922 | COMEDI_NUM_MINORS); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1923 | return PTR_ERR(comedi_class); |
| 1924 | } |
| 1925 | |
| 1926 | /* XXX requires /proc interface */ |
| 1927 | comedi_proc_init(); |
| 1928 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1929 | /* create devices files for legacy/manual use */ |
Bernd Porr | 1dd33ab | 2008-12-08 23:30:13 +0000 | [diff] [blame] | 1930 | for (i = 0; i < comedi_num_legacy_minors; i++) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1931 | int minor; |
| 1932 | minor = comedi_alloc_board_minor(NULL); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1933 | if (minor < 0) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1934 | comedi_cleanup_legacy_minors(); |
| 1935 | cdev_del(&comedi_cdev); |
| 1936 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1937 | COMEDI_NUM_MINORS); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1938 | return minor; |
| 1939 | } |
| 1940 | } |
| 1941 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1942 | comedi_register_ioctl32(); |
| 1943 | |
| 1944 | return 0; |
| 1945 | } |
| 1946 | |
| 1947 | static void __exit comedi_cleanup(void) |
| 1948 | { |
| 1949 | int i; |
| 1950 | |
| 1951 | comedi_cleanup_legacy_minors(); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1952 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1953 | BUG_ON(comedi_file_info_table[i]); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1954 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1955 | |
| 1956 | class_destroy(comedi_class); |
| 1957 | cdev_del(&comedi_cdev); |
| 1958 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); |
| 1959 | |
| 1960 | comedi_proc_cleanup(); |
| 1961 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1962 | comedi_unregister_ioctl32(); |
| 1963 | } |
| 1964 | |
| 1965 | module_init(comedi_init); |
| 1966 | module_exit(comedi_cleanup); |
| 1967 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 1968 | void comedi_error(const struct comedi_device *dev, const char *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1969 | { |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 1970 | printk("comedi%d: %s: %s\n", dev->minor, dev->driver->driver_name, s); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1971 | } |
| 1972 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 1973 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1974 | { |
Bill Pemberton | d163679 | 2009-03-16 22:05:20 -0400 | [diff] [blame] | 1975 | struct comedi_async *async = s->async; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1976 | unsigned runflags = 0; |
| 1977 | unsigned runflags_mask = 0; |
| 1978 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1979 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1980 | |
| 1981 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) |
| 1982 | return; |
| 1983 | |
| 1984 | if (s->async-> |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 1985 | events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1986 | runflags_mask |= SRF_RUNNING; |
| 1987 | } |
| 1988 | /* remember if an error event has occured, so an error |
| 1989 | * can be returned the next time the user does a read() */ |
| 1990 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { |
| 1991 | runflags_mask |= SRF_ERROR; |
| 1992 | runflags |= SRF_ERROR; |
| 1993 | } |
| 1994 | if (runflags_mask) { |
| 1995 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ |
| 1996 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); |
| 1997 | } |
| 1998 | |
| 1999 | if (async->cb_mask & s->async->events) { |
| 2000 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { |
Greg Kroah-Hartman | fcea115 | 2009-04-27 15:15:30 -0700 | [diff] [blame] | 2001 | wake_up_interruptible(&async->wait_head); |
| 2002 | if (s->subdev_flags & SDF_CMD_READ) { |
| 2003 | kill_fasync(&dev->async_queue, SIGIO, |
| 2004 | POLL_IN); |
| 2005 | } |
| 2006 | if (s->subdev_flags & SDF_CMD_WRITE) { |
| 2007 | kill_fasync(&dev->async_queue, SIGIO, |
| 2008 | POLL_OUT); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2009 | } |
| 2010 | } else { |
| 2011 | if (async->cb_func) |
| 2012 | async->cb_func(s->async->events, async->cb_arg); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2013 | } |
| 2014 | } |
| 2015 | s->async->events = 0; |
| 2016 | } |
| 2017 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2018 | void comedi_set_subdevice_runflags(struct comedi_subdevice *s, unsigned mask, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2019 | unsigned bits) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2020 | { |
| 2021 | unsigned long flags; |
| 2022 | |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2023 | spin_lock_irqsave(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2024 | s->runflags &= ~mask; |
| 2025 | s->runflags |= (bits & mask); |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2026 | spin_unlock_irqrestore(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2027 | } |
| 2028 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2029 | unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2030 | { |
| 2031 | unsigned long flags; |
| 2032 | unsigned runflags; |
| 2033 | |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2034 | spin_lock_irqsave(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2035 | runflags = s->runflags; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2036 | spin_unlock_irqrestore(&s->spin_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2037 | return runflags; |
| 2038 | } |
| 2039 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 2040 | static int is_device_busy(struct comedi_device *dev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2041 | { |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2042 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2043 | int i; |
| 2044 | |
| 2045 | if (!dev->attached) |
| 2046 | return 0; |
| 2047 | |
| 2048 | for (i = 0; i < dev->n_subdevices; i++) { |
| 2049 | s = dev->subdevices + i; |
| 2050 | if (s->busy) |
| 2051 | return 1; |
| 2052 | if (s->async && s->async->mmap_count) |
| 2053 | return 1; |
| 2054 | } |
| 2055 | |
| 2056 | return 0; |
| 2057 | } |
| 2058 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 2059 | void comedi_device_init(struct comedi_device *dev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2060 | { |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 2061 | memset(dev, 0, sizeof(struct comedi_device)); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2062 | spin_lock_init(&dev->spinlock); |
| 2063 | mutex_init(&dev->mutex); |
| 2064 | dev->minor = -1; |
| 2065 | } |
| 2066 | |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 2067 | void comedi_device_cleanup(struct comedi_device *dev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2068 | { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2069 | if (dev == NULL) |
| 2070 | return; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2071 | mutex_lock(&dev->mutex); |
| 2072 | comedi_device_detach(dev); |
| 2073 | mutex_unlock(&dev->mutex); |
| 2074 | mutex_destroy(&dev->mutex); |
| 2075 | } |
| 2076 | |
| 2077 | int comedi_alloc_board_minor(struct device *hardware_device) |
| 2078 | { |
| 2079 | unsigned long flags; |
| 2080 | struct comedi_device_file_info *info; |
Bill Pemberton | 0bfbbe8 | 2009-03-16 22:05:36 -0400 | [diff] [blame] | 2081 | struct device *csdev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2082 | unsigned i; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2083 | int retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2084 | |
| 2085 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2086 | if (info == NULL) |
| 2087 | return -ENOMEM; |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 2088 | info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2089 | if (info->device == NULL) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2090 | kfree(info); |
| 2091 | return -ENOMEM; |
| 2092 | } |
| 2093 | comedi_device_init(info->device); |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2094 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2095 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
| 2096 | if (comedi_file_info_table[i] == NULL) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2097 | comedi_file_info_table[i] = info; |
| 2098 | break; |
| 2099 | } |
| 2100 | } |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2101 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2102 | if (i == COMEDI_NUM_BOARD_MINORS) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2103 | comedi_device_cleanup(info->device); |
| 2104 | kfree(info->device); |
| 2105 | kfree(info); |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2106 | printk(KERN_ERR "comedi: error: ran out of minor numbers for board device files.\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2107 | return -EBUSY; |
| 2108 | } |
| 2109 | info->device->minor = i; |
| 2110 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2111 | MKDEV(COMEDI_MAJOR, i), NULL, |
| 2112 | hardware_device, "comedi%i", i); |
| 2113 | if (!IS_ERR(csdev)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2114 | info->device->class_dev = csdev; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2115 | dev_set_drvdata(csdev, info); |
| 2116 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); |
| 2117 | if (retval) { |
| 2118 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2119 | dev_attr_max_read_buffer_kb.attr.name); |
| 2120 | comedi_free_board_minor(i); |
| 2121 | return retval; |
| 2122 | } |
| 2123 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); |
| 2124 | if (retval) { |
| 2125 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2126 | dev_attr_read_buffer_kb.attr.name); |
| 2127 | comedi_free_board_minor(i); |
| 2128 | return retval; |
| 2129 | } |
| 2130 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); |
| 2131 | if (retval) { |
| 2132 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2133 | dev_attr_max_write_buffer_kb.attr.name); |
| 2134 | comedi_free_board_minor(i); |
| 2135 | return retval; |
| 2136 | } |
| 2137 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); |
| 2138 | if (retval) { |
| 2139 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2140 | dev_attr_write_buffer_kb.attr.name); |
| 2141 | comedi_free_board_minor(i); |
| 2142 | return retval; |
| 2143 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2144 | return i; |
| 2145 | } |
| 2146 | |
| 2147 | void comedi_free_board_minor(unsigned minor) |
| 2148 | { |
| 2149 | unsigned long flags; |
| 2150 | struct comedi_device_file_info *info; |
| 2151 | |
| 2152 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2153 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2154 | info = comedi_file_info_table[minor]; |
| 2155 | comedi_file_info_table[minor] = NULL; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2156 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2157 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2158 | if (info) { |
Bill Pemberton | 71b5f4f | 2009-03-16 22:05:08 -0400 | [diff] [blame] | 2159 | struct comedi_device *dev = info->device; |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2160 | if (dev) { |
| 2161 | if (dev->class_dev) { |
| 2162 | device_destroy(comedi_class, |
| 2163 | MKDEV(COMEDI_MAJOR, dev->minor)); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2164 | } |
| 2165 | comedi_device_cleanup(dev); |
| 2166 | kfree(dev); |
| 2167 | } |
| 2168 | kfree(info); |
| 2169 | } |
| 2170 | } |
| 2171 | |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2172 | int comedi_alloc_subdevice_minor(struct comedi_device *dev, |
| 2173 | struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2174 | { |
| 2175 | unsigned long flags; |
| 2176 | struct comedi_device_file_info *info; |
Bill Pemberton | 0bfbbe8 | 2009-03-16 22:05:36 -0400 | [diff] [blame] | 2177 | struct device *csdev; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2178 | unsigned i; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2179 | int retval; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2180 | |
| 2181 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2182 | if (info == NULL) |
| 2183 | return -ENOMEM; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2184 | info->device = dev; |
| 2185 | info->read_subdevice = s; |
| 2186 | info->write_subdevice = s; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2187 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
Frank Mori Hess | 4c41f3a | 2008-12-09 14:47:22 +0000 | [diff] [blame] | 2188 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) { |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2189 | if (comedi_file_info_table[i] == NULL) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2190 | comedi_file_info_table[i] = info; |
| 2191 | break; |
| 2192 | } |
| 2193 | } |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2194 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2195 | if (i == COMEDI_NUM_MINORS) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2196 | kfree(info); |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2197 | printk(KERN_ERR "comedi: error: ran out of minor numbers for board device files.\n"); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2198 | return -EBUSY; |
| 2199 | } |
| 2200 | s->minor = i; |
| 2201 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2202 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
| 2203 | "comedi%i_subd%i", dev->minor, |
| 2204 | (int)(s - dev->subdevices)); |
| 2205 | if (!IS_ERR(csdev)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2206 | s->class_dev = csdev; |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2207 | dev_set_drvdata(csdev, info); |
| 2208 | retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); |
| 2209 | if (retval) { |
| 2210 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2211 | dev_attr_max_read_buffer_kb.attr.name); |
| 2212 | comedi_free_subdevice_minor(s); |
| 2213 | return retval; |
| 2214 | } |
| 2215 | retval = device_create_file(csdev, &dev_attr_read_buffer_kb); |
| 2216 | if (retval) { |
| 2217 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2218 | dev_attr_read_buffer_kb.attr.name); |
| 2219 | comedi_free_subdevice_minor(s); |
| 2220 | return retval; |
| 2221 | } |
| 2222 | retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); |
| 2223 | if (retval) { |
| 2224 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2225 | dev_attr_max_write_buffer_kb.attr.name); |
| 2226 | comedi_free_subdevice_minor(s); |
| 2227 | return retval; |
| 2228 | } |
| 2229 | retval = device_create_file(csdev, &dev_attr_write_buffer_kb); |
| 2230 | if (retval) { |
| 2231 | printk(KERN_ERR "comedi: failed to create sysfs attribute file \"%s\".\n", |
| 2232 | dev_attr_write_buffer_kb.attr.name); |
| 2233 | comedi_free_subdevice_minor(s); |
| 2234 | return retval; |
| 2235 | } |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2236 | return i; |
| 2237 | } |
| 2238 | |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 2239 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2240 | { |
| 2241 | unsigned long flags; |
| 2242 | struct comedi_device_file_info *info; |
| 2243 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2244 | if (s == NULL) |
| 2245 | return; |
| 2246 | if (s->minor < 0) |
| 2247 | return; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2248 | |
| 2249 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
| 2250 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); |
| 2251 | |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2252 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2253 | info = comedi_file_info_table[s->minor]; |
| 2254 | comedi_file_info_table[s->minor] = NULL; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2255 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2256 | |
Greg Kroah-Hartman | 476b847 | 2008-11-13 17:05:58 -0800 | [diff] [blame] | 2257 | if (s->class_dev) { |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2258 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
| 2259 | s->class_dev = NULL; |
| 2260 | } |
| 2261 | kfree(info); |
| 2262 | } |
| 2263 | |
| 2264 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) |
| 2265 | { |
| 2266 | unsigned long flags; |
| 2267 | struct comedi_device_file_info *info; |
| 2268 | |
| 2269 | BUG_ON(minor >= COMEDI_NUM_MINORS); |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2270 | spin_lock_irqsave(&comedi_file_info_table_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2271 | info = comedi_file_info_table[minor]; |
Greg Kroah-Hartman | 5f74ea1 | 2009-04-27 14:44:31 -0700 | [diff] [blame] | 2272 | spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 2273 | return info; |
| 2274 | } |
Frank Mori Hess | 883db3d | 2009-04-14 11:21:41 -0400 | [diff] [blame] | 2275 | |
| 2276 | static int resize_async_buffer(struct comedi_device *dev, |
| 2277 | struct comedi_subdevice *s, |
| 2278 | struct comedi_async *async, unsigned new_size) |
| 2279 | { |
| 2280 | int retval; |
| 2281 | |
| 2282 | if (new_size > async->max_bufsize) |
| 2283 | return -EPERM; |
| 2284 | |
| 2285 | if (s->busy) { |
| 2286 | DPRINTK("subdevice is busy, cannot resize buffer\n"); |
| 2287 | return -EBUSY; |
| 2288 | } |
| 2289 | if (async->mmap_count) { |
| 2290 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); |
| 2291 | return -EBUSY; |
| 2292 | } |
| 2293 | |
| 2294 | if (!async->prealloc_buf) |
| 2295 | return -EINVAL; |
| 2296 | |
| 2297 | /* make sure buffer is an integral number of pages |
| 2298 | * (we round up) */ |
| 2299 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
| 2300 | |
| 2301 | retval = comedi_buf_alloc(dev, s, new_size); |
| 2302 | if (retval < 0) |
| 2303 | return retval; |
| 2304 | |
| 2305 | if (s->buf_change) { |
| 2306 | retval = s->buf_change(dev, s, new_size); |
| 2307 | if (retval < 0) |
| 2308 | return retval; |
| 2309 | } |
| 2310 | |
| 2311 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", |
| 2312 | dev->minor, s - dev->subdevices, async->prealloc_bufsz); |
| 2313 | return 0; |
| 2314 | } |
| 2315 | |
| 2316 | /* sysfs attribute files */ |
| 2317 | |
| 2318 | static const unsigned bytes_per_kibi = 1024; |
| 2319 | |
| 2320 | static ssize_t show_max_read_buffer_kb(struct device *dev, |
| 2321 | struct device_attribute *attr, char *buf) |
| 2322 | { |
| 2323 | ssize_t retval; |
| 2324 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2325 | unsigned max_buffer_size_kb = 0; |
| 2326 | struct comedi_subdevice *const read_subdevice = |
| 2327 | comedi_get_read_subdevice(info); |
| 2328 | |
| 2329 | mutex_lock(&info->device->mutex); |
| 2330 | if (read_subdevice && |
| 2331 | (read_subdevice->subdev_flags & SDF_CMD_READ) && |
| 2332 | read_subdevice->async) { |
| 2333 | max_buffer_size_kb = read_subdevice->async->max_bufsize / |
| 2334 | bytes_per_kibi; |
| 2335 | } |
| 2336 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
| 2337 | mutex_unlock(&info->device->mutex); |
| 2338 | |
| 2339 | return retval; |
| 2340 | } |
| 2341 | |
| 2342 | static ssize_t store_max_read_buffer_kb(struct device *dev, |
| 2343 | struct device_attribute *attr, |
| 2344 | const char *buf, size_t count) |
| 2345 | { |
| 2346 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2347 | unsigned long new_max_size_kb; |
| 2348 | uint64_t new_max_size; |
| 2349 | struct comedi_subdevice *const read_subdevice = |
| 2350 | comedi_get_read_subdevice(info); |
| 2351 | |
| 2352 | if (strict_strtoul(buf, 10, &new_max_size_kb)) |
| 2353 | return -EINVAL; |
| 2354 | if (new_max_size_kb != (uint32_t)new_max_size_kb) |
| 2355 | return -EINVAL; |
| 2356 | new_max_size = ((uint64_t)new_max_size_kb) * bytes_per_kibi; |
| 2357 | if (new_max_size != (uint32_t)new_max_size) |
| 2358 | return -EINVAL; |
| 2359 | |
| 2360 | mutex_lock(&info->device->mutex); |
| 2361 | if (read_subdevice == NULL || |
| 2362 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || |
| 2363 | read_subdevice->async == NULL) { |
| 2364 | mutex_unlock(&info->device->mutex); |
| 2365 | return -EINVAL; |
| 2366 | } |
| 2367 | read_subdevice->async->max_bufsize = new_max_size; |
| 2368 | mutex_unlock(&info->device->mutex); |
| 2369 | |
| 2370 | return count; |
| 2371 | } |
| 2372 | |
| 2373 | static struct device_attribute dev_attr_max_read_buffer_kb = { |
| 2374 | .attr = { |
| 2375 | .name = "max_read_buffer_kb", |
| 2376 | .mode = S_IRUGO | S_IWUSR |
| 2377 | }, |
| 2378 | .show = &show_max_read_buffer_kb, |
| 2379 | .store = &store_max_read_buffer_kb |
| 2380 | }; |
| 2381 | |
| 2382 | static ssize_t show_read_buffer_kb(struct device *dev, |
| 2383 | struct device_attribute *attr, char *buf) |
| 2384 | { |
| 2385 | ssize_t retval; |
| 2386 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2387 | unsigned buffer_size_kb = 0; |
| 2388 | struct comedi_subdevice *const read_subdevice = |
| 2389 | comedi_get_read_subdevice(info); |
| 2390 | |
| 2391 | mutex_lock(&info->device->mutex); |
| 2392 | if (read_subdevice && |
| 2393 | (read_subdevice->subdev_flags & SDF_CMD_READ) && |
| 2394 | read_subdevice->async) { |
| 2395 | buffer_size_kb = read_subdevice->async->prealloc_bufsz / |
| 2396 | bytes_per_kibi; |
| 2397 | } |
| 2398 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
| 2399 | mutex_unlock(&info->device->mutex); |
| 2400 | |
| 2401 | return retval; |
| 2402 | } |
| 2403 | |
| 2404 | static ssize_t store_read_buffer_kb(struct device *dev, |
| 2405 | struct device_attribute *attr, |
| 2406 | const char *buf, size_t count) |
| 2407 | { |
| 2408 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2409 | unsigned long new_size_kb; |
| 2410 | uint64_t new_size; |
| 2411 | int retval; |
| 2412 | struct comedi_subdevice *const read_subdevice = |
| 2413 | comedi_get_read_subdevice(info); |
| 2414 | |
| 2415 | if (strict_strtoul(buf, 10, &new_size_kb)) |
| 2416 | return -EINVAL; |
| 2417 | if (new_size_kb != (uint32_t)new_size_kb) |
| 2418 | return -EINVAL; |
| 2419 | new_size = ((uint64_t)new_size_kb) * bytes_per_kibi; |
| 2420 | if (new_size != (uint32_t)new_size) |
| 2421 | return -EINVAL; |
| 2422 | |
| 2423 | mutex_lock(&info->device->mutex); |
| 2424 | if (read_subdevice == NULL || |
| 2425 | (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || |
| 2426 | read_subdevice->async == NULL) { |
| 2427 | mutex_unlock(&info->device->mutex); |
| 2428 | return -EINVAL; |
| 2429 | } |
| 2430 | retval = resize_async_buffer(info->device, read_subdevice, |
| 2431 | read_subdevice->async, new_size); |
| 2432 | mutex_unlock(&info->device->mutex); |
| 2433 | |
| 2434 | if (retval < 0) |
| 2435 | return retval; |
| 2436 | return count; |
| 2437 | } |
| 2438 | |
| 2439 | static struct device_attribute dev_attr_read_buffer_kb = { |
| 2440 | .attr = { |
| 2441 | .name = "read_buffer_kb", |
| 2442 | .mode = S_IRUGO | S_IWUSR | S_IWGRP |
| 2443 | }, |
| 2444 | .show = &show_read_buffer_kb, |
| 2445 | .store = &store_read_buffer_kb |
| 2446 | }; |
| 2447 | |
| 2448 | static ssize_t show_max_write_buffer_kb(struct device *dev, |
| 2449 | struct device_attribute *attr, |
| 2450 | char *buf) |
| 2451 | { |
| 2452 | ssize_t retval; |
| 2453 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2454 | unsigned max_buffer_size_kb = 0; |
| 2455 | struct comedi_subdevice *const write_subdevice = |
| 2456 | comedi_get_write_subdevice(info); |
| 2457 | |
| 2458 | mutex_lock(&info->device->mutex); |
| 2459 | if (write_subdevice && |
| 2460 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && |
| 2461 | write_subdevice->async) { |
| 2462 | max_buffer_size_kb = write_subdevice->async->max_bufsize / |
| 2463 | bytes_per_kibi; |
| 2464 | } |
| 2465 | retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); |
| 2466 | mutex_unlock(&info->device->mutex); |
| 2467 | |
| 2468 | return retval; |
| 2469 | } |
| 2470 | |
| 2471 | static ssize_t store_max_write_buffer_kb(struct device *dev, |
| 2472 | struct device_attribute *attr, |
| 2473 | const char *buf, size_t count) |
| 2474 | { |
| 2475 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2476 | unsigned long new_max_size_kb; |
| 2477 | uint64_t new_max_size; |
| 2478 | struct comedi_subdevice *const write_subdevice = |
| 2479 | comedi_get_write_subdevice(info); |
| 2480 | |
| 2481 | if (strict_strtoul(buf, 10, &new_max_size_kb)) |
| 2482 | return -EINVAL; |
| 2483 | if (new_max_size_kb != (uint32_t)new_max_size_kb) |
| 2484 | return -EINVAL; |
| 2485 | new_max_size = ((uint64_t)new_max_size_kb) * bytes_per_kibi; |
| 2486 | if (new_max_size != (uint32_t)new_max_size) |
| 2487 | return -EINVAL; |
| 2488 | |
| 2489 | mutex_lock(&info->device->mutex); |
| 2490 | if (write_subdevice == NULL || |
| 2491 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || |
| 2492 | write_subdevice->async == NULL) { |
| 2493 | mutex_unlock(&info->device->mutex); |
| 2494 | return -EINVAL; |
| 2495 | } |
| 2496 | write_subdevice->async->max_bufsize = new_max_size; |
| 2497 | mutex_unlock(&info->device->mutex); |
| 2498 | |
| 2499 | return count; |
| 2500 | } |
| 2501 | |
| 2502 | static struct device_attribute dev_attr_max_write_buffer_kb = { |
| 2503 | .attr = { |
| 2504 | .name = "max_write_buffer_kb", |
| 2505 | .mode = S_IRUGO | S_IWUSR |
| 2506 | }, |
| 2507 | .show = &show_max_write_buffer_kb, |
| 2508 | .store = &store_max_write_buffer_kb |
| 2509 | }; |
| 2510 | |
| 2511 | static ssize_t show_write_buffer_kb(struct device *dev, |
| 2512 | struct device_attribute *attr, char *buf) |
| 2513 | { |
| 2514 | ssize_t retval; |
| 2515 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2516 | unsigned buffer_size_kb = 0; |
| 2517 | struct comedi_subdevice *const write_subdevice = |
| 2518 | comedi_get_write_subdevice(info); |
| 2519 | |
| 2520 | mutex_lock(&info->device->mutex); |
| 2521 | if (write_subdevice && |
| 2522 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) && |
| 2523 | write_subdevice->async) { |
| 2524 | buffer_size_kb = write_subdevice->async->prealloc_bufsz / |
| 2525 | bytes_per_kibi; |
| 2526 | } |
| 2527 | retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); |
| 2528 | mutex_unlock(&info->device->mutex); |
| 2529 | |
| 2530 | return retval; |
| 2531 | } |
| 2532 | |
| 2533 | static ssize_t store_write_buffer_kb(struct device *dev, |
| 2534 | struct device_attribute *attr, |
| 2535 | const char *buf, size_t count) |
| 2536 | { |
| 2537 | struct comedi_device_file_info *info = dev_get_drvdata(dev); |
| 2538 | unsigned long new_size_kb; |
| 2539 | uint64_t new_size; |
| 2540 | int retval; |
| 2541 | struct comedi_subdevice *const write_subdevice = |
| 2542 | comedi_get_write_subdevice(info); |
| 2543 | |
| 2544 | if (strict_strtoul(buf, 10, &new_size_kb)) |
| 2545 | return -EINVAL; |
| 2546 | if (new_size_kb != (uint32_t)new_size_kb) |
| 2547 | return -EINVAL; |
| 2548 | new_size = ((uint64_t)new_size_kb) * bytes_per_kibi; |
| 2549 | if (new_size != (uint32_t)new_size) |
| 2550 | return -EINVAL; |
| 2551 | |
| 2552 | mutex_lock(&info->device->mutex); |
| 2553 | if (write_subdevice == NULL || |
| 2554 | (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || |
| 2555 | write_subdevice->async == NULL) { |
| 2556 | mutex_unlock(&info->device->mutex); |
| 2557 | return -EINVAL; |
| 2558 | } |
| 2559 | retval = resize_async_buffer(info->device, write_subdevice, |
| 2560 | write_subdevice->async, new_size); |
| 2561 | mutex_unlock(&info->device->mutex); |
| 2562 | |
| 2563 | if (retval < 0) |
| 2564 | return retval; |
| 2565 | return count; |
| 2566 | } |
| 2567 | |
| 2568 | static struct device_attribute dev_attr_write_buffer_kb = { |
| 2569 | .attr = { |
| 2570 | .name = "write_buffer_kb", |
| 2571 | .mode = S_IRUGO | S_IWUSR | S_IWGRP |
| 2572 | }, |
| 2573 | .show = &show_write_buffer_kb, |
| 2574 | .store = &store_write_buffer_kb |
| 2575 | }; |