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. |
| 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 |
Jean Delvare | 5694f8a | 2012-03-26 21:47:19 +0200 | [diff] [blame] | 20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| 21 | MA 02110-1301 USA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
| 23 | |
| 24 | /* Note that this is a complete rewrite of Simon Vogl's i2c-dev module. |
| 25 | But I have used so much of his original code and ideas that it seems |
| 26 | only fair to recognize him as co-author -- Frodo */ |
| 27 | |
| 28 | /* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */ |
| 29 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/kernel.h> |
| 31 | #include <linux/module.h> |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 32 | #include <linux/device.h> |
| 33 | #include <linux/notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/fs.h> |
| 35 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/init.h> |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 37 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/i2c.h> |
| 39 | #include <linux/i2c-dev.h> |
Jean Delvare | cd97f39 | 2009-02-24 19:19:49 +0100 | [diff] [blame] | 40 | #include <linux/jiffies.h> |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 41 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 43 | /* |
| 44 | * An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a |
| 45 | * slave (i2c_client) with which messages will be exchanged. It's coupled |
| 46 | * with a character special file which is accessed by user mode drivers. |
| 47 | * |
| 48 | * 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] | 49 | * maintained by the driver model, and is updated using bus notifications. |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 50 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | struct i2c_dev { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 52 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | struct i2c_adapter *adap; |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 54 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | #define I2C_MINORS 256 |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 58 | static LIST_HEAD(i2c_dev_list); |
| 59 | static DEFINE_SPINLOCK(i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | static struct i2c_dev *i2c_dev_get_by_minor(unsigned index) |
| 62 | { |
| 63 | struct i2c_dev *i2c_dev; |
| 64 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 65 | spin_lock(&i2c_dev_list_lock); |
| 66 | list_for_each_entry(i2c_dev, &i2c_dev_list, list) { |
| 67 | if (i2c_dev->adap->nr == index) |
| 68 | goto found; |
| 69 | } |
| 70 | i2c_dev = NULL; |
| 71 | found: |
| 72 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | return i2c_dev; |
| 74 | } |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap) |
| 77 | { |
| 78 | struct i2c_dev *i2c_dev; |
| 79 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 80 | if (adap->nr >= I2C_MINORS) { |
| 81 | printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n", |
| 82 | adap->nr); |
| 83 | return ERR_PTR(-ENODEV); |
| 84 | } |
| 85 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 86 | i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | if (!i2c_dev) |
| 88 | return ERR_PTR(-ENOMEM); |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 89 | i2c_dev->adap = adap; |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 90 | |
| 91 | spin_lock(&i2c_dev_list_lock); |
| 92 | list_add_tail(&i2c_dev->list, &i2c_dev_list); |
| 93 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | return i2c_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static void return_i2c_dev(struct i2c_dev *i2c_dev) |
| 98 | { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 99 | spin_lock(&i2c_dev_list_lock); |
| 100 | list_del(&i2c_dev->list); |
| 101 | spin_unlock(&i2c_dev_list_lock); |
Jean Delvare | 07125ab | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 102 | kfree(i2c_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 105 | static ssize_t show_adapter_name(struct device *dev, |
| 106 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 108 | struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt)); |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 109 | |
| 110 | if (!i2c_dev) |
| 111 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | return sprintf(buf, "%s\n", i2c_dev->adap->name); |
| 113 | } |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 114 | static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 116 | /* ------------------------------------------------------------------------- */ |
| 117 | |
| 118 | /* |
| 119 | * After opening an instance of this character special file, a file |
| 120 | * descriptor starts out associated only with an i2c_adapter (and bus). |
| 121 | * |
| 122 | * Using the I2C_RDWR ioctl(), you can then *immediately* issue i2c_msg |
| 123 | * traffic to any devices on the bus used by that adapter. That's because |
| 124 | * the i2c_msg vectors embed all the addressing information they need, and |
| 125 | * are submitted directly to an i2c_adapter. However, SMBus-only adapters |
| 126 | * don't support that interface. |
| 127 | * |
| 128 | * To use read()/write() system calls on that file descriptor, or to use |
| 129 | * SMBus interfaces (and work with SMBus-only hosts!), you must first issue |
| 130 | * an I2C_SLAVE (or I2C_SLAVE_FORCE) ioctl. That configures an anonymous |
| 131 | * (never registered) i2c_client so it holds the addressing information |
| 132 | * needed by those system calls and by this SMBus interface. |
| 133 | */ |
| 134 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 135 | static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count, |
| 136 | loff_t *offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
| 138 | char *tmp; |
| 139 | int ret; |
| 140 | |
H Hartley Sweeten | 0be16c3 | 2010-05-21 18:40:57 +0200 | [diff] [blame] | 141 | struct i2c_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | if (count > 8192) |
| 144 | count = 8192; |
| 145 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 146 | tmp = kmalloc(count, GFP_KERNEL); |
| 147 | if (tmp == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | return -ENOMEM; |
| 149 | |
David Brownell | 2ce5b34 | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 150 | pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n", |
Josef Sipek | cba0a12 | 2006-12-08 02:37:08 -0800 | [diff] [blame] | 151 | iminor(file->f_path.dentry->d_inode), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 153 | ret = i2c_master_recv(client, tmp, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if (ret >= 0) |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 155 | ret = copy_to_user(buf, tmp, count) ? -EFAULT : ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | kfree(tmp); |
| 157 | return ret; |
| 158 | } |
| 159 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 160 | static ssize_t i2cdev_write(struct file *file, const char __user *buf, |
| 161 | size_t count, loff_t *offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | { |
| 163 | int ret; |
| 164 | char *tmp; |
H Hartley Sweeten | 0be16c3 | 2010-05-21 18:40:57 +0200 | [diff] [blame] | 165 | struct i2c_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
| 167 | if (count > 8192) |
| 168 | count = 8192; |
| 169 | |
Julia Lawall | f1c2e33 | 2010-08-11 18:20:55 +0200 | [diff] [blame] | 170 | tmp = memdup_user(buf, count); |
| 171 | if (IS_ERR(tmp)) |
| 172 | return PTR_ERR(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
David Brownell | 2ce5b34 | 2008-08-10 22:56:16 +0200 | [diff] [blame] | 174 | pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n", |
Josef Sipek | cba0a12 | 2006-12-08 02:37:08 -0800 | [diff] [blame] | 175 | iminor(file->f_path.dentry->d_inode), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 177 | ret = i2c_master_send(client, tmp, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | kfree(tmp); |
| 179 | return ret; |
| 180 | } |
| 181 | |
David Brownell | 9b766b8 | 2008-01-27 18:14:51 +0100 | [diff] [blame] | 182 | static int i2cdev_check(struct device *dev, void *addrp) |
| 183 | { |
| 184 | struct i2c_client *client = i2c_verify_client(dev); |
| 185 | |
| 186 | if (!client || client->addr != *(unsigned int *)addrp) |
| 187 | return 0; |
| 188 | |
| 189 | return dev->driver ? -EBUSY : 0; |
| 190 | } |
| 191 | |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 192 | /* walk up mux tree */ |
| 193 | static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr) |
| 194 | { |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 195 | struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 196 | int result; |
| 197 | |
| 198 | result = device_for_each_child(&adapter->dev, &addr, i2cdev_check); |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 199 | if (!result && parent) |
| 200 | result = i2cdev_check_mux_parents(parent, addr); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 201 | |
| 202 | return result; |
| 203 | } |
| 204 | |
| 205 | /* recurse down mux tree */ |
| 206 | static int i2cdev_check_mux_children(struct device *dev, void *addrp) |
| 207 | { |
| 208 | int result; |
| 209 | |
| 210 | if (dev->type == &i2c_adapter_type) |
| 211 | result = device_for_each_child(dev, addrp, |
| 212 | i2cdev_check_mux_children); |
| 213 | else |
| 214 | result = i2cdev_check(dev, addrp); |
| 215 | |
| 216 | return result; |
| 217 | } |
| 218 | |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 219 | /* This address checking function differs from the one in i2c-core |
| 220 | in that it considers an address with a registered device, but no |
David Brownell | 9b766b8 | 2008-01-27 18:14:51 +0100 | [diff] [blame] | 221 | driver bound to it, as NOT busy. */ |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 222 | static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr) |
| 223 | { |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 224 | struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 225 | int result = 0; |
| 226 | |
Jean Delvare | 97cc4d4 | 2010-10-24 18:16:57 +0200 | [diff] [blame] | 227 | if (parent) |
| 228 | result = i2cdev_check_mux_parents(parent, addr); |
Michael Lawnick | 0826374 | 2010-08-11 18:21:02 +0200 | [diff] [blame] | 229 | |
| 230 | if (!result) |
| 231 | result = device_for_each_child(&adapter->dev, &addr, |
| 232 | i2cdev_check_mux_children); |
| 233 | |
| 234 | return result; |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 235 | } |
| 236 | |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 237 | static noinline int i2cdev_ioctl_rdrw(struct i2c_client *client, |
| 238 | unsigned long arg) |
| 239 | { |
| 240 | struct i2c_rdwr_ioctl_data rdwr_arg; |
| 241 | struct i2c_msg *rdwr_pa; |
| 242 | u8 __user **data_ptrs; |
| 243 | int i, res; |
| 244 | |
| 245 | if (copy_from_user(&rdwr_arg, |
| 246 | (struct i2c_rdwr_ioctl_data __user *)arg, |
| 247 | sizeof(rdwr_arg))) |
| 248 | return -EFAULT; |
| 249 | |
| 250 | /* Put an arbitrary limit on the number of messages that can |
| 251 | * be sent at once */ |
| 252 | if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS) |
| 253 | return -EINVAL; |
| 254 | |
Thomas Meyer | a699ed6f | 2012-01-12 20:32:04 +0100 | [diff] [blame] | 255 | rdwr_pa = memdup_user(rdwr_arg.msgs, |
| 256 | rdwr_arg.nmsgs * sizeof(struct i2c_msg)); |
| 257 | if (IS_ERR(rdwr_pa)) |
| 258 | return PTR_ERR(rdwr_pa); |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 259 | |
| 260 | data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); |
| 261 | if (data_ptrs == NULL) { |
| 262 | kfree(rdwr_pa); |
| 263 | return -ENOMEM; |
| 264 | } |
| 265 | |
| 266 | res = 0; |
| 267 | for (i = 0; i < rdwr_arg.nmsgs; i++) { |
| 268 | /* Limit the size of the message to a sane amount; |
| 269 | * and don't let length change either. */ |
| 270 | if ((rdwr_pa[i].len > 8192) || |
| 271 | (rdwr_pa[i].flags & I2C_M_RECV_LEN)) { |
| 272 | res = -EINVAL; |
| 273 | break; |
| 274 | } |
| 275 | data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; |
Julia Lawall | f1c2e33 | 2010-08-11 18:20:55 +0200 | [diff] [blame] | 276 | rdwr_pa[i].buf = memdup_user(data_ptrs[i], rdwr_pa[i].len); |
| 277 | if (IS_ERR(rdwr_pa[i].buf)) { |
| 278 | res = PTR_ERR(rdwr_pa[i].buf); |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 279 | break; |
| 280 | } |
| 281 | } |
| 282 | if (res < 0) { |
| 283 | int j; |
| 284 | for (j = 0; j < i; ++j) |
| 285 | kfree(rdwr_pa[j].buf); |
| 286 | kfree(data_ptrs); |
| 287 | kfree(rdwr_pa); |
| 288 | return res; |
| 289 | } |
| 290 | |
| 291 | res = i2c_transfer(client->adapter, rdwr_pa, rdwr_arg.nmsgs); |
| 292 | while (i-- > 0) { |
| 293 | if (res >= 0 && (rdwr_pa[i].flags & I2C_M_RD)) { |
| 294 | if (copy_to_user(data_ptrs[i], rdwr_pa[i].buf, |
| 295 | rdwr_pa[i].len)) |
| 296 | res = -EFAULT; |
| 297 | } |
| 298 | kfree(rdwr_pa[i].buf); |
| 299 | } |
| 300 | kfree(data_ptrs); |
| 301 | kfree(rdwr_pa); |
| 302 | return res; |
| 303 | } |
| 304 | |
| 305 | static noinline int i2cdev_ioctl_smbus(struct i2c_client *client, |
| 306 | unsigned long arg) |
| 307 | { |
| 308 | struct i2c_smbus_ioctl_data data_arg; |
| 309 | union i2c_smbus_data temp; |
| 310 | int datasize, res; |
| 311 | |
| 312 | if (copy_from_user(&data_arg, |
| 313 | (struct i2c_smbus_ioctl_data __user *) arg, |
| 314 | sizeof(struct i2c_smbus_ioctl_data))) |
| 315 | return -EFAULT; |
| 316 | if ((data_arg.size != I2C_SMBUS_BYTE) && |
| 317 | (data_arg.size != I2C_SMBUS_QUICK) && |
| 318 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && |
| 319 | (data_arg.size != I2C_SMBUS_WORD_DATA) && |
| 320 | (data_arg.size != I2C_SMBUS_PROC_CALL) && |
| 321 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && |
| 322 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) && |
| 323 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && |
| 324 | (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { |
| 325 | dev_dbg(&client->adapter->dev, |
| 326 | "size out of range (%x) in ioctl I2C_SMBUS.\n", |
| 327 | data_arg.size); |
| 328 | return -EINVAL; |
| 329 | } |
| 330 | /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, |
| 331 | so the check is valid if size==I2C_SMBUS_QUICK too. */ |
| 332 | if ((data_arg.read_write != I2C_SMBUS_READ) && |
| 333 | (data_arg.read_write != I2C_SMBUS_WRITE)) { |
| 334 | dev_dbg(&client->adapter->dev, |
| 335 | "read_write out of range (%x) in ioctl I2C_SMBUS.\n", |
| 336 | data_arg.read_write); |
| 337 | return -EINVAL; |
| 338 | } |
| 339 | |
| 340 | /* Note that command values are always valid! */ |
| 341 | |
| 342 | if ((data_arg.size == I2C_SMBUS_QUICK) || |
| 343 | ((data_arg.size == I2C_SMBUS_BYTE) && |
| 344 | (data_arg.read_write == I2C_SMBUS_WRITE))) |
| 345 | /* These are special: we do not use data */ |
| 346 | return i2c_smbus_xfer(client->adapter, client->addr, |
| 347 | client->flags, data_arg.read_write, |
| 348 | data_arg.command, data_arg.size, NULL); |
| 349 | |
| 350 | if (data_arg.data == NULL) { |
| 351 | dev_dbg(&client->adapter->dev, |
| 352 | "data is NULL pointer in ioctl I2C_SMBUS.\n"); |
| 353 | return -EINVAL; |
| 354 | } |
| 355 | |
| 356 | if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || |
| 357 | (data_arg.size == I2C_SMBUS_BYTE)) |
| 358 | datasize = sizeof(data_arg.data->byte); |
| 359 | else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || |
| 360 | (data_arg.size == I2C_SMBUS_PROC_CALL)) |
| 361 | datasize = sizeof(data_arg.data->word); |
| 362 | else /* size == smbus block, i2c block, or block proc. call */ |
| 363 | datasize = sizeof(data_arg.data->block); |
| 364 | |
| 365 | if ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 366 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
| 367 | (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) || |
| 368 | (data_arg.read_write == I2C_SMBUS_WRITE)) { |
| 369 | if (copy_from_user(&temp, data_arg.data, datasize)) |
| 370 | return -EFAULT; |
| 371 | } |
| 372 | if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) { |
| 373 | /* Convert old I2C block commands to the new |
| 374 | convention. This preserves binary compatibility. */ |
| 375 | data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA; |
| 376 | if (data_arg.read_write == I2C_SMBUS_READ) |
| 377 | temp.block[0] = I2C_SMBUS_BLOCK_MAX; |
| 378 | } |
| 379 | res = i2c_smbus_xfer(client->adapter, client->addr, client->flags, |
| 380 | data_arg.read_write, data_arg.command, data_arg.size, &temp); |
| 381 | if (!res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 382 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
| 383 | (data_arg.read_write == I2C_SMBUS_READ))) { |
| 384 | if (copy_to_user(data_arg.data, &temp, datasize)) |
| 385 | return -EFAULT; |
| 386 | } |
| 387 | return res; |
| 388 | } |
| 389 | |
Alan Cox | 77e38bf | 2008-07-14 22:38:27 +0200 | [diff] [blame] | 390 | 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] | 391 | { |
H Hartley Sweeten | 0be16c3 | 2010-05-21 18:40:57 +0200 | [diff] [blame] | 392 | struct i2c_client *client = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | unsigned long funcs; |
| 394 | |
Jean Delvare | e8aafcb | 2005-10-07 23:06:27 +0200 | [diff] [blame] | 395 | dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n", |
| 396 | cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 398 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | case I2C_SLAVE: |
| 400 | case I2C_SLAVE_FORCE: |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 401 | /* NOTE: devices set up to work with "new style" drivers |
| 402 | * can't use I2C_SLAVE, even when the device node is not |
| 403 | * bound to a driver. Only I2C_SLAVE_FORCE will work. |
| 404 | * |
| 405 | * Setting the PEC flag here won't affect kernel drivers, |
| 406 | * which will be using the i2c_client node registered with |
| 407 | * the driver model core. Likewise, when that client has |
| 408 | * the PEC flag already set, the i2c-dev driver won't see |
| 409 | * (or use) this setting. |
| 410 | */ |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 411 | if ((arg > 0x3ff) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) |
| 413 | return -EINVAL; |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 414 | if (cmd == I2C_SLAVE && i2cdev_check_addr(client->adapter, arg)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | return -EBUSY; |
Jean Delvare | bd4217d | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 416 | /* REVISIT: address could become busy later */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | client->addr = arg; |
| 418 | return 0; |
| 419 | case I2C_TENBIT: |
| 420 | if (arg) |
| 421 | client->flags |= I2C_M_TEN; |
| 422 | else |
| 423 | client->flags &= ~I2C_M_TEN; |
| 424 | return 0; |
| 425 | case I2C_PEC: |
| 426 | if (arg) |
| 427 | client->flags |= I2C_CLIENT_PEC; |
| 428 | else |
| 429 | client->flags &= ~I2C_CLIENT_PEC; |
| 430 | return 0; |
| 431 | case I2C_FUNCS: |
| 432 | funcs = i2c_get_functionality(client->adapter); |
Jean Delvare | 2c003e8 | 2006-12-10 21:21:30 +0100 | [diff] [blame] | 433 | return put_user(funcs, (unsigned long __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | case I2C_RDWR: |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 436 | return i2cdev_ioctl_rdrw(client, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | case I2C_SMBUS: |
Jean Delvare | dba7997 | 2008-04-22 22:16:47 +0200 | [diff] [blame] | 439 | return i2cdev_ioctl_smbus(client, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
David Brownell | 53be795 | 2007-10-13 23:56:32 +0200 | [diff] [blame] | 441 | case I2C_RETRIES: |
| 442 | client->adapter->retries = arg; |
| 443 | break; |
| 444 | case I2C_TIMEOUT: |
Jean Delvare | cd97f39 | 2009-02-24 19:19:49 +0100 | [diff] [blame] | 445 | /* For historical reasons, user-space sets the timeout |
| 446 | * value in units of 10 ms. |
| 447 | */ |
| 448 | client->adapter->timeout = msecs_to_jiffies(arg * 10); |
David Brownell | 53be795 | 2007-10-13 23:56:32 +0200 | [diff] [blame] | 449 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | default: |
David Brownell | 53be795 | 2007-10-13 23:56:32 +0200 | [diff] [blame] | 451 | /* NOTE: returning a fault code here could cause trouble |
| 452 | * in buggy userspace code. Some old kernel bugs returned |
| 453 | * zero in this case, and userspace code might accidentally |
| 454 | * have depended on that bug. |
| 455 | */ |
| 456 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | static int i2cdev_open(struct inode *inode, struct file *file) |
| 462 | { |
| 463 | unsigned int minor = iminor(inode); |
| 464 | struct i2c_client *client; |
| 465 | struct i2c_adapter *adap; |
| 466 | struct i2c_dev *i2c_dev; |
| 467 | |
| 468 | i2c_dev = i2c_dev_get_by_minor(minor); |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 469 | if (!i2c_dev) |
| 470 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | adap = i2c_get_adapter(i2c_dev->adap->nr); |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 473 | if (!adap) |
| 474 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 476 | /* This creates an anonymous i2c_client, which may later be |
| 477 | * pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE. |
| 478 | * |
| 479 | * This client is ** NEVER REGISTERED ** with the driver model |
| 480 | * or I2C core code!! It just holds private copies of addressing |
| 481 | * information and maybe a PEC flag. |
| 482 | */ |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 483 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | if (!client) { |
| 485 | i2c_put_adapter(adap); |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 486 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 488 | snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | client->adapter = adap; |
| 491 | file->private_data = client; |
| 492 | |
Vincent Sanders | 9669f54 | 2009-12-06 17:06:26 +0100 | [diff] [blame] | 493 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | static int i2cdev_release(struct inode *inode, struct file *file) |
| 497 | { |
| 498 | struct i2c_client *client = file->private_data; |
| 499 | |
| 500 | i2c_put_adapter(client->adapter); |
| 501 | kfree(client); |
| 502 | file->private_data = NULL; |
| 503 | |
| 504 | return 0; |
| 505 | } |
| 506 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 507 | static const struct file_operations i2cdev_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | .owner = THIS_MODULE, |
| 509 | .llseek = no_llseek, |
| 510 | .read = i2cdev_read, |
| 511 | .write = i2cdev_write, |
Alan Cox | 77e38bf | 2008-07-14 22:38:27 +0200 | [diff] [blame] | 512 | .unlocked_ioctl = i2cdev_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | .open = i2cdev_open, |
| 514 | .release = i2cdev_release, |
| 515 | }; |
| 516 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 517 | /* ------------------------------------------------------------------------- */ |
| 518 | |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 519 | static struct class *i2c_dev_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 521 | static int i2cdev_attach_adapter(struct device *dev, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 523 | struct i2c_adapter *adap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | struct i2c_dev *i2c_dev; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 525 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 527 | if (dev->type != &i2c_adapter_type) |
| 528 | return 0; |
| 529 | adap = to_i2c_adapter(dev); |
| 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | i2c_dev = get_free_i2c_dev(adap); |
| 532 | if (IS_ERR(i2c_dev)) |
| 533 | return PTR_ERR(i2c_dev); |
| 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | /* register this i2c device with the driver core */ |
Greg Kroah-Hartman | a9b1261 | 2008-07-21 20:03:34 -0700 | [diff] [blame] | 536 | i2c_dev->dev = device_create(i2c_dev_class, &adap->dev, |
| 537 | MKDEV(I2C_MAJOR, adap->nr), NULL, |
| 538 | "i2c-%d", adap->nr); |
Akinobu Mita | 3bacb36 | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 539 | if (IS_ERR(i2c_dev->dev)) { |
| 540 | res = PTR_ERR(i2c_dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | goto error; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 542 | } |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 543 | res = device_create_file(i2c_dev->dev, &dev_attr_name); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 544 | if (res) |
| 545 | goto error_destroy; |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 546 | |
| 547 | pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", |
| 548 | adap->name, adap->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | return 0; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 550 | error_destroy: |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 551 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | error: |
| 553 | return_i2c_dev(i2c_dev); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 554 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 557 | static int i2cdev_detach_adapter(struct device *dev, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | { |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 559 | struct i2c_adapter *adap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | struct i2c_dev *i2c_dev; |
| 561 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 562 | if (dev->type != &i2c_adapter_type) |
| 563 | return 0; |
| 564 | adap = to_i2c_adapter(dev); |
| 565 | |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 566 | i2c_dev = i2c_dev_get_by_minor(adap->nr); |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 567 | if (!i2c_dev) /* attach_adapter must have failed */ |
| 568 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 570 | device_remove_file(i2c_dev->dev, &dev_attr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | return_i2c_dev(i2c_dev); |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 572 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
Jean Delvare | b6d7b3d | 2005-07-31 19:02:53 +0200 | [diff] [blame] | 574 | pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | return 0; |
| 576 | } |
| 577 | |
Shubhrajyoti D | eff245c | 2011-11-23 11:33:07 +0100 | [diff] [blame] | 578 | static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action, |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 579 | void *data) |
| 580 | { |
| 581 | struct device *dev = data; |
| 582 | |
| 583 | switch (action) { |
| 584 | case BUS_NOTIFY_ADD_DEVICE: |
| 585 | return i2cdev_attach_adapter(dev, NULL); |
| 586 | case BUS_NOTIFY_DEL_DEVICE: |
| 587 | return i2cdev_detach_adapter(dev, NULL); |
| 588 | } |
| 589 | |
| 590 | return 0; |
| 591 | } |
| 592 | |
| 593 | static struct notifier_block i2cdev_notifier = { |
| 594 | .notifier_call = i2cdev_notifier_call, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | }; |
| 596 | |
David Brownell | 907135a | 2007-11-15 19:24:01 +0100 | [diff] [blame] | 597 | /* ------------------------------------------------------------------------- */ |
| 598 | |
| 599 | /* |
| 600 | * module load/unload record keeping |
| 601 | */ |
| 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | static int __init i2c_dev_init(void) |
| 604 | { |
| 605 | int res; |
| 606 | |
| 607 | printk(KERN_INFO "i2c /dev entries driver\n"); |
| 608 | |
| 609 | res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops); |
| 610 | if (res) |
| 611 | goto out; |
| 612 | |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 613 | i2c_dev_class = class_create(THIS_MODULE, "i2c-dev"); |
Sven Wegener | e74783e | 2008-09-24 13:39:21 +0200 | [diff] [blame] | 614 | if (IS_ERR(i2c_dev_class)) { |
| 615 | res = PTR_ERR(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | goto out_unreg_chrdev; |
Sven Wegener | e74783e | 2008-09-24 13:39:21 +0200 | [diff] [blame] | 617 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 619 | /* Keep track of adapters which will be added or removed later */ |
| 620 | res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if (res) |
| 622 | goto out_unreg_class; |
| 623 | |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 624 | /* Bind to already existing adapters right away */ |
| 625 | i2c_for_each_dev(NULL, i2cdev_attach_adapter); |
| 626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | return 0; |
| 628 | |
| 629 | out_unreg_class: |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 630 | class_destroy(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | out_unreg_chrdev: |
| 632 | unregister_chrdev(I2C_MAJOR, "i2c"); |
| 633 | out: |
| 634 | printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); |
| 635 | return res; |
| 636 | } |
| 637 | |
| 638 | static void __exit i2c_dev_exit(void) |
| 639 | { |
Jean Delvare | 9ea3e94 | 2011-03-20 14:50:52 +0100 | [diff] [blame] | 640 | bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier); |
| 641 | i2c_for_each_dev(NULL, i2cdev_detach_adapter); |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 642 | class_destroy(i2c_dev_class); |
Farid Hammane | ae5624f | 2010-05-21 18:40:59 +0200 | [diff] [blame] | 643 | unregister_chrdev(I2C_MAJOR, "i2c"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
| 647 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
| 648 | MODULE_DESCRIPTION("I2C /dev entries driver"); |
| 649 | MODULE_LICENSE("GPL"); |
| 650 | |
| 651 | module_init(i2c_dev_init); |
| 652 | module_exit(i2c_dev_exit); |