Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 2 | i2c-dev.c - i2c-bus driver, char device interface |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | |
| 4 | Copyright (C) 1995-97 Simon G. Vogl |
| 5 | Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
| 6 | Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> |
| 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | |
| 19 | /* Note that this is a complete rewrite of Simon Vogl's i2c-dev module. |
| 20 | But I have used so much of his original code and ideas that it seems |
| 21 | only fair to recognize him as co-author -- Frodo */ |
| 22 | |
| 23 | /* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */ |
| 24 | |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 25 | #include <linux/cdev.h> |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 26 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/i2c-dev.h> |
Wolfram Sang | a876607 | 2016-02-20 23:33:38 +0100 | [diff] [blame] | 29 | #include <linux/i2c.h> |
| 30 | #include <linux/init.h> |
Jean Delvare | cd97f39 | 2009-02-24 19:19:49 +0100 | [diff] [blame] | 31 | #include <linux/jiffies.h> |
Wolfram Sang | a876607 | 2016-02-20 23:33:38 +0100 | [diff] [blame] | 32 | #include <linux/kernel.h> |
| 33 | #include <linux/list.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/notifier.h> |
| 36 | #include <linux/slab.h> |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 37 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 39 | /* |
| 40 | * An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a |
| 41 | * slave (i2c_client) with which messages will be exchanged. It's coupled |
| 42 | * with a character special file which is accessed by user mode drivers. |
| 43 | * |
| 44 | * The list of i2c_dev structures is parallel to the i2c_adapter lists |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 45 | * maintained by the driver model, and is updated using bus notifications. |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 46 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | struct i2c_dev { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 48 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | struct i2c_adapter *adap; |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 50 | struct device *dev; |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 51 | struct cdev cdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 54 | #define I2C_MINORS MINORMASK |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 55 | static LIST_HEAD(i2c_dev_list); |
| 56 | static DEFINE_SPINLOCK(i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | static struct i2c_dev *i2c_dev_get_by_minor(unsigned index) |
| 59 | { |
| 60 | struct i2c_dev *i2c_dev; |
| 61 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 62 | spin_lock(&i2c_dev_list_lock); |
| 63 | list_for_each_entry(i2c_dev, &i2c_dev_list, list) { |
| 64 | if (i2c_dev->adap->nr == index) |
| 65 | goto found; |
| 66 | } |
| 67 | i2c_dev = NULL; |
| 68 | found: |
| 69 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | return i2c_dev; |
| 71 | } |
| 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap) |
| 74 | { |
| 75 | struct i2c_dev *i2c_dev; |
| 76 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 77 | if (adap->nr >= I2C_MINORS) { |
| 78 | printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n", |
| 79 | adap->nr); |
| 80 | return ERR_PTR(-ENODEV); |
| 81 | } |
| 82 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 83 | i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | if (!i2c_dev) |
| 85 | return ERR_PTR(-ENOMEM); |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 86 | i2c_dev->adap = adap; |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 87 | |
| 88 | spin_lock(&i2c_dev_list_lock); |
| 89 | list_add_tail(&i2c_dev->list, &i2c_dev_list); |
| 90 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | return i2c_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Wolfram Sang | 72a71f8 | 2016-05-27 13:13:01 +0200 | [diff] [blame] | 94 | static void put_i2c_dev(struct i2c_dev *i2c_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 96 | spin_lock(&i2c_dev_list_lock); |
| 97 | list_del(&i2c_dev->list); |
| 98 | spin_unlock(&i2c_dev_list_lock); |
Jean Delvare | 07125ab | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 99 | kfree(i2c_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Guenter Roeck | 45f176a | 2013-09-26 19:36:11 -0700 | [diff] [blame] | 102 | static ssize_t name_show(struct device *dev, |
| 103 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 105 | struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt)); |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 106 | |
| 107 | if (!i2c_dev) |
| 108 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | return sprintf(buf, "%s\n", i2c_dev->adap->name); |
| 110 | } |
Guenter Roeck | 45f176a | 2013-09-26 19:36:11 -0700 | [diff] [blame] | 111 | static DEVICE_ATTR_RO(name); |
| 112 | |
| 113 | static struct attribute *i2c_attrs[] = { |
| 114 | &dev_attr_name.attr, |
| 115 | NULL, |
| 116 | }; |
| 117 | ATTRIBUTE_GROUPS(i2c); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 119 | /* ------------------------------------------------------------------------- */ |
| 120 | |
| 121 | /* |
| 122 | * After opening an instance of this character special file, a file |
| 123 | * descriptor starts out associated only with an i2c_adapter (and bus). |
| 124 | * |
| 125 | * Using the I2C_RDWR ioctl(), you can then *immediately* issue i2c_msg |
| 126 | * traffic to any devices on the bus used by that adapter. That's because |
| 127 | * the i2c_msg vectors embed all the addressing information they need, and |
| 128 | * are submitted directly to an i2c_adapter. However, SMBus-only adapters |
| 129 | * don't support that interface. |
| 130 | * |
| 131 | * To use read()/write() system calls on that file descriptor, or to use |
| 132 | * SMBus interfaces (and work with SMBus-only hosts!), you must first issue |
| 133 | * an I2C_SLAVE (or I2C_SLAVE_FORCE) ioctl. That configures an anonymous |
| 134 | * (never registered) i2c_client so it holds the addressing information |
| 135 | * needed by those system calls and by this SMBus interface. |
| 136 | */ |
| 137 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 138 | static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count, |
| 139 | loff_t *offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
| 141 | char *tmp; |
| 142 | int ret; |
| 143 | |
H Hartley Sweeten | 0be16c3 | 2010-05-21 18:40:57 +0200 | [diff] [blame] | 144 | struct i2c_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | if (count > 8192) |
| 147 | count = 8192; |
| 148 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 149 | tmp = kmalloc(count, GFP_KERNEL); |
| 150 | if (tmp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | return -ENOMEM; |
| 152 | |
David Brownell | 2ce5b34 | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 153 | pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n", |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 154 | iminor(file_inode(file)), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 156 | ret = i2c_master_recv(client, tmp, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (ret >= 0) |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 158 | ret = copy_to_user(buf, tmp, count) ? -EFAULT : ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | kfree(tmp); |
| 160 | return ret; |
| 161 | } |
| 162 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 163 | static ssize_t i2cdev_write(struct file *file, const char __user *buf, |
| 164 | size_t count, loff_t *offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
| 166 | int ret; |
| 167 | char *tmp; |
H Hartley Sweeten | 0be16c3 | 2010-05-21 18:40:57 +0200 | [diff] [blame] | 168 | struct i2c_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | if (count > 8192) |
| 171 | count = 8192; |
| 172 | |
Julia Lawall | f1c2e33 | 2010-08-11 18:20:55 +0200 | [diff] [blame] | 173 | tmp = memdup_user(buf, count); |
| 174 | if (IS_ERR(tmp)) |
| 175 | return PTR_ERR(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
David Brownell | 2ce5b34 | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 177 | pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n", |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 178 | iminor(file_inode(file)), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 180 | ret = i2c_master_send(client, tmp, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | kfree(tmp); |
| 182 | return ret; |
| 183 | } |
| 184 | |
David Brownell | 9b766b8 | 2008-01-27 18:14:51 +0100 | [diff] [blame] | 185 | static int i2cdev_check(struct device *dev, void *addrp) |
| 186 | { |
| 187 | struct i2c_client *client = i2c_verify_client(dev); |
| 188 | |
| 189 | if (!client || client->addr != *(unsigned int *)addrp) |
| 190 | return 0; |
| 191 | |
| 192 | return dev->driver ? -EBUSY : 0; |
| 193 | } |
| 194 | |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 195 | /* walk up mux tree */ |
| 196 | static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr) |
| 197 | { |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 198 | struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 199 | int result; |
| 200 | |
| 201 | result = device_for_each_child(&adapter->dev, &addr, i2cdev_check); |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 202 | if (!result && parent) |
| 203 | result = i2cdev_check_mux_parents(parent, addr); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 204 | |
| 205 | return result; |
| 206 | } |
| 207 | |
| 208 | /* recurse down mux tree */ |
| 209 | static int i2cdev_check_mux_children(struct device *dev, void *addrp) |
| 210 | { |
| 211 | int result; |
| 212 | |
| 213 | if (dev->type == &i2c_adapter_type) |
| 214 | result = device_for_each_child(dev, addrp, |
| 215 | i2cdev_check_mux_children); |
| 216 | else |
| 217 | result = i2cdev_check(dev, addrp); |
| 218 | |
| 219 | return result; |
| 220 | } |
| 221 | |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 222 | /* This address checking function differs from the one in i2c-core |
| 223 | in that it considers an address with a registered device, but no |
David Brownell | 9b766b8 | 2008-01-27 18:14:51 +0100 | [diff] [blame] | 224 | driver bound to it, as NOT busy. */ |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 225 | static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr) |
| 226 | { |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 227 | struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 228 | int result = 0; |
| 229 | |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 230 | if (parent) |
| 231 | result = i2cdev_check_mux_parents(parent, addr); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 232 | |
| 233 | if (!result) |
| 234 | result = device_for_each_child(&adapter->dev, &addr, |
| 235 | i2cdev_check_mux_children); |
| 236 | |
| 237 | return result; |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 238 | } |
| 239 | |
Jean Delvare | c57d3e7 | 2015-09-08 11:05:49 +0200 | [diff] [blame] | 240 | static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client, |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 241 | unsigned long arg) |
| 242 | { |
| 243 | struct i2c_rdwr_ioctl_data rdwr_arg; |
| 244 | struct i2c_msg *rdwr_pa; |
| 245 | u8 __user **data_ptrs; |
| 246 | int i, res; |
| 247 | |
| 248 | if (copy_from_user(&rdwr_arg, |
| 249 | (struct i2c_rdwr_ioctl_data __user *)arg, |
| 250 | sizeof(rdwr_arg))) |
| 251 | return -EFAULT; |
| 252 | |
| 253 | /* Put an arbitrary limit on the number of messages that can |
| 254 | * be sent at once */ |
Jean Delvare | c57d3e7 | 2015-09-08 11:05:49 +0200 | [diff] [blame] | 255 | if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 256 | return -EINVAL; |
| 257 | |
Thomas Meyer | a699ed6f | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 258 | rdwr_pa = memdup_user(rdwr_arg.msgs, |
| 259 | rdwr_arg.nmsgs * sizeof(struct i2c_msg)); |
| 260 | if (IS_ERR(rdwr_pa)) |
| 261 | return PTR_ERR(rdwr_pa); |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 262 | |
| 263 | data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); |
| 264 | if (data_ptrs == NULL) { |
| 265 | kfree(rdwr_pa); |
| 266 | return -ENOMEM; |
| 267 | } |
| 268 | |
| 269 | res = 0; |
| 270 | for (i = 0; i < rdwr_arg.nmsgs; i++) { |
Jean Delvare | 838bfa6 | 2012-05-30 10:55:34 +0200 | [diff] [blame] | 271 | /* Limit the size of the message to a sane amount */ |
| 272 | if (rdwr_pa[i].len > 8192) { |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 273 | res = -EINVAL; |
| 274 | break; |
| 275 | } |
Jean Delvare | 838bfa6 | 2012-05-30 10:55:34 +0200 | [diff] [blame] | 276 | |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 277 | data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; |
Julia Lawall | f1c2e33 | 2010-08-11 18:20:55 +0200 | [diff] [blame] | 278 | rdwr_pa[i].buf = memdup_user(data_ptrs[i], rdwr_pa[i].len); |
| 279 | if (IS_ERR(rdwr_pa[i].buf)) { |
| 280 | res = PTR_ERR(rdwr_pa[i].buf); |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 281 | break; |
| 282 | } |
Jean Delvare | 838bfa6 | 2012-05-30 10:55:34 +0200 | [diff] [blame] | 283 | |
| 284 | /* |
| 285 | * If the message length is received from the slave (similar |
| 286 | * to SMBus block read), we must ensure that the buffer will |
| 287 | * be large enough to cope with a message length of |
| 288 | * I2C_SMBUS_BLOCK_MAX as this is the maximum underlying bus |
| 289 | * drivers allow. The first byte in the buffer must be |
| 290 | * pre-filled with the number of extra bytes, which must be |
| 291 | * at least one to hold the message length, but can be |
| 292 | * greater (for example to account for a checksum byte at |
| 293 | * the end of the message.) |
| 294 | */ |
| 295 | if (rdwr_pa[i].flags & I2C_M_RECV_LEN) { |
| 296 | if (!(rdwr_pa[i].flags & I2C_M_RD) || |
| 297 | rdwr_pa[i].buf[0] < 1 || |
| 298 | rdwr_pa[i].len < rdwr_pa[i].buf[0] + |
| 299 | I2C_SMBUS_BLOCK_MAX) { |
| 300 | res = -EINVAL; |
| 301 | break; |
| 302 | } |
| 303 | |
| 304 | rdwr_pa[i].len = rdwr_pa[i].buf[0]; |
| 305 | } |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 306 | } |
| 307 | if (res < 0) { |
| 308 | int j; |
| 309 | for (j = 0; j < i; ++j) |
| 310 | kfree(rdwr_pa[j].buf); |
| 311 | kfree(data_ptrs); |
| 312 | kfree(rdwr_pa); |
| 313 | return res; |
| 314 | } |
| 315 | |
| 316 | res = i2c_transfer(client->adapter, rdwr_pa, rdwr_arg.nmsgs); |
| 317 | while (i-- > 0) { |
| 318 | if (res >= 0 && (rdwr_pa[i].flags & I2C_M_RD)) { |
| 319 | if (copy_to_user(data_ptrs[i], rdwr_pa[i].buf, |
| 320 | rdwr_pa[i].len)) |
| 321 | res = -EFAULT; |
| 322 | } |
| 323 | kfree(rdwr_pa[i].buf); |
| 324 | } |
| 325 | kfree(data_ptrs); |
| 326 | kfree(rdwr_pa); |
| 327 | return res; |
| 328 | } |
| 329 | |
| 330 | static noinline int i2cdev_ioctl_smbus(struct i2c_client *client, |
| 331 | unsigned long arg) |
| 332 | { |
| 333 | struct i2c_smbus_ioctl_data data_arg; |
| 334 | union i2c_smbus_data temp; |
| 335 | int datasize, res; |
| 336 | |
| 337 | if (copy_from_user(&data_arg, |
| 338 | (struct i2c_smbus_ioctl_data __user *) arg, |
| 339 | sizeof(struct i2c_smbus_ioctl_data))) |
| 340 | return -EFAULT; |
| 341 | if ((data_arg.size != I2C_SMBUS_BYTE) && |
| 342 | (data_arg.size != I2C_SMBUS_QUICK) && |
| 343 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && |
| 344 | (data_arg.size != I2C_SMBUS_WORD_DATA) && |
| 345 | (data_arg.size != I2C_SMBUS_PROC_CALL) && |
| 346 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && |
| 347 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) && |
| 348 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && |
| 349 | (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { |
| 350 | dev_dbg(&client->adapter->dev, |
| 351 | "size out of range (%x) in ioctl I2C_SMBUS.\n", |
| 352 | data_arg.size); |
| 353 | return -EINVAL; |
| 354 | } |
| 355 | /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, |
| 356 | so the check is valid if size==I2C_SMBUS_QUICK too. */ |
| 357 | if ((data_arg.read_write != I2C_SMBUS_READ) && |
| 358 | (data_arg.read_write != I2C_SMBUS_WRITE)) { |
| 359 | dev_dbg(&client->adapter->dev, |
| 360 | "read_write out of range (%x) in ioctl I2C_SMBUS.\n", |
| 361 | data_arg.read_write); |
| 362 | return -EINVAL; |
| 363 | } |
| 364 | |
| 365 | /* Note that command values are always valid! */ |
| 366 | |
| 367 | if ((data_arg.size == I2C_SMBUS_QUICK) || |
| 368 | ((data_arg.size == I2C_SMBUS_BYTE) && |
| 369 | (data_arg.read_write == I2C_SMBUS_WRITE))) |
| 370 | /* These are special: we do not use data */ |
| 371 | return i2c_smbus_xfer(client->adapter, client->addr, |
| 372 | client->flags, data_arg.read_write, |
| 373 | data_arg.command, data_arg.size, NULL); |
| 374 | |
| 375 | if (data_arg.data == NULL) { |
| 376 | dev_dbg(&client->adapter->dev, |
| 377 | "data is NULL pointer in ioctl I2C_SMBUS.\n"); |
| 378 | return -EINVAL; |
| 379 | } |
| 380 | |
| 381 | if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || |
| 382 | (data_arg.size == I2C_SMBUS_BYTE)) |
| 383 | datasize = sizeof(data_arg.data->byte); |
| 384 | else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || |
| 385 | (data_arg.size == I2C_SMBUS_PROC_CALL)) |
| 386 | datasize = sizeof(data_arg.data->word); |
| 387 | else /* size == smbus block, i2c block, or block proc. call */ |
| 388 | datasize = sizeof(data_arg.data->block); |
| 389 | |
| 390 | if ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 391 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
| 392 | (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) || |
| 393 | (data_arg.read_write == I2C_SMBUS_WRITE)) { |
| 394 | if (copy_from_user(&temp, data_arg.data, datasize)) |
| 395 | return -EFAULT; |
| 396 | } |
| 397 | if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) { |
| 398 | /* Convert old I2C block commands to the new |
| 399 | convention. This preserves binary compatibility. */ |
| 400 | data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA; |
| 401 | if (data_arg.read_write == I2C_SMBUS_READ) |
| 402 | temp.block[0] = I2C_SMBUS_BLOCK_MAX; |
| 403 | } |
| 404 | res = i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
| 405 | data_arg.read_write, data_arg.command, data_arg.size, &temp); |
| 406 | if (!res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 407 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
| 408 | (data_arg.read_write == I2C_SMBUS_READ))) { |
| 409 | if (copy_to_user(data_arg.data, &temp, datasize)) |
| 410 | return -EFAULT; |
| 411 | } |
| 412 | return res; |
| 413 | } |
| 414 | |
Alan Cox | 77e38bf | 2008-07-14 22:38:27 +0200 | [diff] [blame] | 415 | static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
H Hartley Sweeten | 0be16c3 | 2010-05-21 18:40:57 +0200 | [diff] [blame] | 417 | struct i2c_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | unsigned long funcs; |
| 419 | |
Jean Delvare | e8aafcb | 2005-10-07 23:06:27 +0200 | [diff] [blame] | 420 | dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n", |
| 421 | cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 423 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | case I2C_SLAVE: |
| 425 | case I2C_SLAVE_FORCE: |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 426 | if ((arg > 0x3ff) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) |
| 428 | return -EINVAL; |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 429 | if (cmd == I2C_SLAVE && i2cdev_check_addr(client->adapter, arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | return -EBUSY; |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 431 | /* REVISIT: address could become busy later */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | client->addr = arg; |
| 433 | return 0; |
| 434 | case I2C_TENBIT: |
| 435 | if (arg) |
| 436 | client->flags |= I2C_M_TEN; |
| 437 | else |
| 438 | client->flags &= ~I2C_M_TEN; |
| 439 | return 0; |
| 440 | case I2C_PEC: |
Jean Delvare | 9e685c8 | 2015-09-11 11:27:18 +0200 | [diff] [blame] | 441 | /* |
| 442 | * Setting the PEC flag here won't affect kernel drivers, |
| 443 | * which will be using the i2c_client node registered with |
| 444 | * the driver model core. Likewise, when that client has |
| 445 | * the PEC flag already set, the i2c-dev driver won't see |
| 446 | * (or use) this setting. |
| 447 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | if (arg) |
| 449 | client->flags |= I2C_CLIENT_PEC; |
| 450 | else |
| 451 | client->flags &= ~I2C_CLIENT_PEC; |
| 452 | return 0; |
| 453 | case I2C_FUNCS: |
| 454 | funcs = i2c_get_functionality(client->adapter); |
Jean Delvare | 2c003e8 | 2006-12-10 21:21:30 +0100 | [diff] [blame] | 455 | return put_user(funcs, (unsigned long __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
| 457 | case I2C_RDWR: |
Jean Delvare | c57d3e7 | 2015-09-08 11:05:49 +0200 | [diff] [blame] | 458 | return i2cdev_ioctl_rdwr(client, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | case I2C_SMBUS: |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 461 | return i2cdev_ioctl_smbus(client, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
David Brownell | 53be795 | 2007-10-13 23:56:32 +0200 | [diff] [blame] | 463 | case I2C_RETRIES: |
| 464 | client->adapter->retries = arg; |
| 465 | break; |
| 466 | case I2C_TIMEOUT: |
Jean Delvare | cd97f39 | 2009-02-24 19:19:49 +0100 | [diff] [blame] | 467 | /* For historical reasons, user-space sets the timeout |
| 468 | * value in units of 10 ms. |
| 469 | */ |
| 470 | client->adapter->timeout = msecs_to_jiffies(arg * 10); |
David Brownell | 53be795 | 2007-10-13 23:56:32 +0200 | [diff] [blame] | 471 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | default: |
David Brownell | 53be795 | 2007-10-13 23:56:32 +0200 | [diff] [blame] | 473 | /* NOTE: returning a fault code here could cause trouble |
| 474 | * in buggy userspace code. Some old kernel bugs returned |
| 475 | * zero in this case, and userspace code might accidentally |
| 476 | * have depended on that bug. |
| 477 | */ |
| 478 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static int i2cdev_open(struct inode *inode, struct file *file) |
| 484 | { |
| 485 | unsigned int minor = iminor(inode); |
| 486 | struct i2c_client *client; |
| 487 | struct i2c_adapter *adap; |
| 488 | struct i2c_dev *i2c_dev; |
| 489 | |
| 490 | i2c_dev = i2c_dev_get_by_minor(minor); |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 491 | if (!i2c_dev) |
| 492 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | adap = i2c_get_adapter(i2c_dev->adap->nr); |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 495 | if (!adap) |
| 496 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 498 | /* This creates an anonymous i2c_client, which may later be |
| 499 | * pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE. |
| 500 | * |
| 501 | * This client is ** NEVER REGISTERED ** with the driver model |
| 502 | * or I2C core code!! It just holds private copies of addressing |
| 503 | * information and maybe a PEC flag. |
| 504 | */ |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 505 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | if (!client) { |
| 507 | i2c_put_adapter(adap); |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 508 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 510 | snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | client->adapter = adap; |
| 513 | file->private_data = client; |
| 514 | |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 515 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | static int i2cdev_release(struct inode *inode, struct file *file) |
| 519 | { |
| 520 | struct i2c_client *client = file->private_data; |
| 521 | |
| 522 | i2c_put_adapter(client->adapter); |
| 523 | kfree(client); |
| 524 | file->private_data = NULL; |
| 525 | |
| 526 | return 0; |
| 527 | } |
| 528 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 529 | static const struct file_operations i2cdev_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | .owner = THIS_MODULE, |
| 531 | .llseek = no_llseek, |
| 532 | .read = i2cdev_read, |
| 533 | .write = i2cdev_write, |
Alan Cox | 77e38bf | 2008-07-14 22:38:27 +0200 | [diff] [blame] | 534 | .unlocked_ioctl = i2cdev_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | .open = i2cdev_open, |
| 536 | .release = i2cdev_release, |
| 537 | }; |
| 538 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 539 | /* ------------------------------------------------------------------------- */ |
| 540 | |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 541 | static struct class *i2c_dev_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 543 | static int i2cdev_attach_adapter(struct device *dev, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | { |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 545 | struct i2c_adapter *adap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | struct i2c_dev *i2c_dev; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 547 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 549 | if (dev->type != &i2c_adapter_type) |
| 550 | return 0; |
| 551 | adap = to_i2c_adapter(dev); |
| 552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | i2c_dev = get_free_i2c_dev(adap); |
| 554 | if (IS_ERR(i2c_dev)) |
| 555 | return PTR_ERR(i2c_dev); |
| 556 | |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 557 | cdev_init(&i2c_dev->cdev, &i2cdev_fops); |
| 558 | i2c_dev->cdev.owner = THIS_MODULE; |
| 559 | res = cdev_add(&i2c_dev->cdev, MKDEV(I2C_MAJOR, adap->nr), 1); |
| 560 | if (res) |
| 561 | goto error_cdev; |
| 562 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | /* register this i2c device with the driver core */ |
Greg Kroah-Hartman | a9b1261 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 564 | i2c_dev->dev = device_create(i2c_dev_class, &adap->dev, |
| 565 | MKDEV(I2C_MAJOR, adap->nr), NULL, |
| 566 | "i2c-%d", adap->nr); |
Akinobu Mita | 3bacb36 | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 567 | if (IS_ERR(i2c_dev->dev)) { |
| 568 | res = PTR_ERR(i2c_dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | goto error; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 570 | } |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 571 | |
| 572 | pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", |
| 573 | adap->name, adap->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | return 0; |
| 575 | error: |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 576 | cdev_del(&i2c_dev->cdev); |
| 577 | error_cdev: |
Wolfram Sang | 72a71f8 | 2016-05-27 13:13:01 +0200 | [diff] [blame] | 578 | put_i2c_dev(i2c_dev); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 579 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 582 | static int i2cdev_detach_adapter(struct device *dev, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 584 | struct i2c_adapter *adap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | struct i2c_dev *i2c_dev; |
| 586 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 587 | if (dev->type != &i2c_adapter_type) |
| 588 | return 0; |
| 589 | adap = to_i2c_adapter(dev); |
| 590 | |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 591 | i2c_dev = i2c_dev_get_by_minor(adap->nr); |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 592 | if (!i2c_dev) /* attach_adapter must have failed */ |
| 593 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
Dan Carpenter | e6be18f | 2016-05-28 08:01:46 +0300 | [diff] [blame] | 595 | cdev_del(&i2c_dev->cdev); |
Wolfram Sang | 72a71f8 | 2016-05-27 13:13:01 +0200 | [diff] [blame] | 596 | put_i2c_dev(i2c_dev); |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 597 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Jean Delvare | b6d7b3d | 2005-07-31 19:02:53 +0200 | [diff] [blame] | 599 | pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | return 0; |
| 601 | } |
| 602 | |
Shubhrajyoti D | eff245c | 2011-11-23 11:33:07 +0100 | [diff] [blame] | 603 | static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action, |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 604 | void *data) |
| 605 | { |
| 606 | struct device *dev = data; |
| 607 | |
| 608 | switch (action) { |
| 609 | case BUS_NOTIFY_ADD_DEVICE: |
| 610 | return i2cdev_attach_adapter(dev, NULL); |
| 611 | case BUS_NOTIFY_DEL_DEVICE: |
| 612 | return i2cdev_detach_adapter(dev, NULL); |
| 613 | } |
| 614 | |
| 615 | return 0; |
| 616 | } |
| 617 | |
| 618 | static struct notifier_block i2cdev_notifier = { |
| 619 | .notifier_call = i2cdev_notifier_call, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | }; |
| 621 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 622 | /* ------------------------------------------------------------------------- */ |
| 623 | |
| 624 | /* |
| 625 | * module load/unload record keeping |
| 626 | */ |
| 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | static int __init i2c_dev_init(void) |
| 629 | { |
| 630 | int res; |
| 631 | |
| 632 | printk(KERN_INFO "i2c /dev entries driver\n"); |
| 633 | |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 634 | res = register_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS, "i2c"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | if (res) |
| 636 | goto out; |
| 637 | |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 638 | i2c_dev_class = class_create(THIS_MODULE, "i2c-dev"); |
Sven Wegener | e74783e | 2008-09-24 13:39:21 +0200 | [diff] [blame] | 639 | if (IS_ERR(i2c_dev_class)) { |
| 640 | res = PTR_ERR(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | goto out_unreg_chrdev; |
Sven Wegener | e74783e | 2008-09-24 13:39:21 +0200 | [diff] [blame] | 642 | } |
Guenter Roeck | 45f176a | 2013-09-26 19:36:11 -0700 | [diff] [blame] | 643 | i2c_dev_class->dev_groups = i2c_groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 645 | /* Keep track of adapters which will be added or removed later */ |
| 646 | res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | if (res) |
| 648 | goto out_unreg_class; |
| 649 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 650 | /* Bind to already existing adapters right away */ |
| 651 | i2c_for_each_dev(NULL, i2cdev_attach_adapter); |
| 652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | return 0; |
| 654 | |
| 655 | out_unreg_class: |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 656 | class_destroy(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | out_unreg_chrdev: |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 658 | unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | out: |
| 660 | printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); |
| 661 | return res; |
| 662 | } |
| 663 | |
| 664 | static void __exit i2c_dev_exit(void) |
| 665 | { |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 666 | bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier); |
| 667 | i2c_for_each_dev(NULL, i2cdev_detach_adapter); |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 668 | class_destroy(i2c_dev_class); |
Erico Nunes | d6760b1 | 2016-05-03 15:45:43 -0300 | [diff] [blame] | 669 | unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
| 673 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
| 674 | MODULE_DESCRIPTION("I2C /dev entries driver"); |
| 675 | MODULE_LICENSE("GPL"); |
| 676 | |
| 677 | module_init(i2c_dev_init); |
| 678 | module_exit(i2c_dev_exit); |