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 |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 | */ |
| 22 | |
| 23 | /* Note that this is a complete rewrite of Simon Vogl's i2c-dev module. |
| 24 | But I have used so much of his original code and ideas that it seems |
| 25 | only fair to recognize him as co-author -- Frodo */ |
| 26 | |
| 27 | /* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */ |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/kernel.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/fs.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/init.h> |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 35 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/i2c.h> |
| 37 | #include <linux/i2c-dev.h> |
| 38 | #include <asm/uaccess.h> |
| 39 | |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 40 | static struct i2c_driver i2cdev_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | struct i2c_dev { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 43 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | struct i2c_adapter *adap; |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 45 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define I2C_MINORS 256 |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 49 | static LIST_HEAD(i2c_dev_list); |
| 50 | static DEFINE_SPINLOCK(i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | static struct i2c_dev *i2c_dev_get_by_minor(unsigned index) |
| 53 | { |
| 54 | struct i2c_dev *i2c_dev; |
| 55 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 56 | spin_lock(&i2c_dev_list_lock); |
| 57 | list_for_each_entry(i2c_dev, &i2c_dev_list, list) { |
| 58 | if (i2c_dev->adap->nr == index) |
| 59 | goto found; |
| 60 | } |
| 61 | i2c_dev = NULL; |
| 62 | found: |
| 63 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | return i2c_dev; |
| 65 | } |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap) |
| 68 | { |
| 69 | struct i2c_dev *i2c_dev; |
| 70 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 71 | if (adap->nr >= I2C_MINORS) { |
| 72 | printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n", |
| 73 | adap->nr); |
| 74 | return ERR_PTR(-ENODEV); |
| 75 | } |
| 76 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 77 | i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | if (!i2c_dev) |
| 79 | return ERR_PTR(-ENOMEM); |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 80 | i2c_dev->adap = adap; |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 81 | |
| 82 | spin_lock(&i2c_dev_list_lock); |
| 83 | list_add_tail(&i2c_dev->list, &i2c_dev_list); |
| 84 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | return i2c_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | static void return_i2c_dev(struct i2c_dev *i2c_dev) |
| 89 | { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 90 | spin_lock(&i2c_dev_list_lock); |
| 91 | list_del(&i2c_dev->list); |
| 92 | spin_unlock(&i2c_dev_list_lock); |
Jean Delvare | 07125ab | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 93 | kfree(i2c_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 96 | static ssize_t show_adapter_name(struct device *dev, |
| 97 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 99 | 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] | 100 | |
| 101 | if (!i2c_dev) |
| 102 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return sprintf(buf, "%s\n", i2c_dev->adap->name); |
| 104 | } |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 105 | static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count, |
| 108 | loff_t *offset) |
| 109 | { |
| 110 | char *tmp; |
| 111 | int ret; |
| 112 | |
| 113 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
| 114 | |
| 115 | if (count > 8192) |
| 116 | count = 8192; |
| 117 | |
| 118 | tmp = kmalloc(count,GFP_KERNEL); |
| 119 | if (tmp==NULL) |
| 120 | return -ENOMEM; |
| 121 | |
| 122 | pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n", |
Josef Sipek | cba0a12 | 2006-12-08 02:37:08 -0800 | [diff] [blame] | 123 | iminor(file->f_path.dentry->d_inode), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | ret = i2c_master_recv(client,tmp,count); |
| 126 | if (ret >= 0) |
| 127 | ret = copy_to_user(buf,tmp,count)?-EFAULT:ret; |
| 128 | kfree(tmp); |
| 129 | return ret; |
| 130 | } |
| 131 | |
| 132 | static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t count, |
| 133 | loff_t *offset) |
| 134 | { |
| 135 | int ret; |
| 136 | char *tmp; |
| 137 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
| 138 | |
| 139 | if (count > 8192) |
| 140 | count = 8192; |
| 141 | |
| 142 | tmp = kmalloc(count,GFP_KERNEL); |
| 143 | if (tmp==NULL) |
| 144 | return -ENOMEM; |
| 145 | if (copy_from_user(tmp,buf,count)) { |
| 146 | kfree(tmp); |
| 147 | return -EFAULT; |
| 148 | } |
| 149 | |
| 150 | pr_debug("i2c-dev: i2c-%d writing %zd 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 | |
| 153 | ret = i2c_master_send(client,tmp,count); |
| 154 | kfree(tmp); |
| 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | static int i2cdev_ioctl(struct inode *inode, struct file *file, |
| 159 | unsigned int cmd, unsigned long arg) |
| 160 | { |
| 161 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
| 162 | struct i2c_rdwr_ioctl_data rdwr_arg; |
| 163 | struct i2c_smbus_ioctl_data data_arg; |
| 164 | union i2c_smbus_data temp; |
| 165 | struct i2c_msg *rdwr_pa; |
| 166 | u8 __user **data_ptrs; |
| 167 | int i,datasize,res; |
| 168 | unsigned long funcs; |
| 169 | |
Jean Delvare | e8aafcb | 2005-10-07 23:06:27 +0200 | [diff] [blame] | 170 | dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n", |
| 171 | cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | switch ( cmd ) { |
| 174 | case I2C_SLAVE: |
| 175 | case I2C_SLAVE_FORCE: |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 176 | if ((arg > 0x3ff) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) |
| 178 | return -EINVAL; |
| 179 | if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg)) |
| 180 | return -EBUSY; |
| 181 | client->addr = arg; |
| 182 | return 0; |
| 183 | case I2C_TENBIT: |
| 184 | if (arg) |
| 185 | client->flags |= I2C_M_TEN; |
| 186 | else |
| 187 | client->flags &= ~I2C_M_TEN; |
| 188 | return 0; |
| 189 | case I2C_PEC: |
| 190 | if (arg) |
| 191 | client->flags |= I2C_CLIENT_PEC; |
| 192 | else |
| 193 | client->flags &= ~I2C_CLIENT_PEC; |
| 194 | return 0; |
| 195 | case I2C_FUNCS: |
| 196 | funcs = i2c_get_functionality(client->adapter); |
Jean Delvare | 2c003e8 | 2006-12-10 21:21:30 +0100 | [diff] [blame] | 197 | return put_user(funcs, (unsigned long __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | case I2C_RDWR: |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 200 | if (copy_from_user(&rdwr_arg, |
| 201 | (struct i2c_rdwr_ioctl_data __user *)arg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | sizeof(rdwr_arg))) |
| 203 | return -EFAULT; |
| 204 | |
Tobias Klauser | d68a861 | 2005-05-19 21:41:47 +0200 | [diff] [blame] | 205 | /* Put an arbitrary limit on the number of messages that can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | * be sent at once */ |
| 207 | if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS) |
| 208 | return -EINVAL; |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | rdwr_pa = (struct i2c_msg *) |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 211 | kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | GFP_KERNEL); |
| 213 | |
| 214 | if (rdwr_pa == NULL) return -ENOMEM; |
| 215 | |
| 216 | if (copy_from_user(rdwr_pa, rdwr_arg.msgs, |
| 217 | rdwr_arg.nmsgs * sizeof(struct i2c_msg))) { |
| 218 | kfree(rdwr_pa); |
| 219 | return -EFAULT; |
| 220 | } |
| 221 | |
| 222 | data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); |
| 223 | if (data_ptrs == NULL) { |
| 224 | kfree(rdwr_pa); |
| 225 | return -ENOMEM; |
| 226 | } |
| 227 | |
| 228 | res = 0; |
| 229 | for( i=0; i<rdwr_arg.nmsgs; i++ ) { |
| 230 | /* Limit the size of the message to a sane amount */ |
| 231 | if (rdwr_pa[i].len > 8192) { |
| 232 | res = -EINVAL; |
| 233 | break; |
| 234 | } |
| 235 | data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; |
| 236 | rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL); |
| 237 | if(rdwr_pa[i].buf == NULL) { |
| 238 | res = -ENOMEM; |
| 239 | break; |
| 240 | } |
| 241 | if(copy_from_user(rdwr_pa[i].buf, |
| 242 | data_ptrs[i], |
| 243 | rdwr_pa[i].len)) { |
| 244 | ++i; /* Needs to be kfreed too */ |
| 245 | res = -EFAULT; |
| 246 | break; |
| 247 | } |
| 248 | } |
| 249 | if (res < 0) { |
| 250 | int j; |
| 251 | for (j = 0; j < i; ++j) |
| 252 | kfree(rdwr_pa[j].buf); |
| 253 | kfree(data_ptrs); |
| 254 | kfree(rdwr_pa); |
| 255 | return res; |
| 256 | } |
| 257 | |
| 258 | res = i2c_transfer(client->adapter, |
| 259 | rdwr_pa, |
| 260 | rdwr_arg.nmsgs); |
| 261 | while(i-- > 0) { |
| 262 | if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) { |
| 263 | if(copy_to_user( |
| 264 | data_ptrs[i], |
| 265 | rdwr_pa[i].buf, |
| 266 | rdwr_pa[i].len)) { |
| 267 | res = -EFAULT; |
| 268 | } |
| 269 | } |
| 270 | kfree(rdwr_pa[i].buf); |
| 271 | } |
| 272 | kfree(data_ptrs); |
| 273 | kfree(rdwr_pa); |
| 274 | return res; |
| 275 | |
| 276 | case I2C_SMBUS: |
| 277 | if (copy_from_user(&data_arg, |
| 278 | (struct i2c_smbus_ioctl_data __user *) arg, |
| 279 | sizeof(struct i2c_smbus_ioctl_data))) |
| 280 | return -EFAULT; |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 281 | if ((data_arg.size != I2C_SMBUS_BYTE) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | (data_arg.size != I2C_SMBUS_QUICK) && |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 283 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | (data_arg.size != I2C_SMBUS_WORD_DATA) && |
| 285 | (data_arg.size != I2C_SMBUS_PROC_CALL) && |
| 286 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && |
| 287 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && |
| 288 | (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { |
| 289 | dev_dbg(&client->adapter->dev, |
| 290 | "size out of range (%x) in ioctl I2C_SMBUS.\n", |
| 291 | data_arg.size); |
| 292 | return -EINVAL; |
| 293 | } |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 294 | /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | so the check is valid if size==I2C_SMBUS_QUICK too. */ |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 296 | if ((data_arg.read_write != I2C_SMBUS_READ) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | (data_arg.read_write != I2C_SMBUS_WRITE)) { |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 298 | dev_dbg(&client->adapter->dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | "read_write out of range (%x) in ioctl I2C_SMBUS.\n", |
| 300 | data_arg.read_write); |
| 301 | return -EINVAL; |
| 302 | } |
| 303 | |
| 304 | /* Note that command values are always valid! */ |
| 305 | |
| 306 | if ((data_arg.size == I2C_SMBUS_QUICK) || |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 307 | ((data_arg.size == I2C_SMBUS_BYTE) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | (data_arg.read_write == I2C_SMBUS_WRITE))) |
| 309 | /* These are special: we do not use data */ |
| 310 | return i2c_smbus_xfer(client->adapter, client->addr, |
| 311 | client->flags, |
| 312 | data_arg.read_write, |
| 313 | data_arg.command, |
| 314 | data_arg.size, NULL); |
| 315 | |
| 316 | if (data_arg.data == NULL) { |
| 317 | dev_dbg(&client->adapter->dev, |
| 318 | "data is NULL pointer in ioctl I2C_SMBUS.\n"); |
| 319 | return -EINVAL; |
| 320 | } |
| 321 | |
| 322 | if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || |
| 323 | (data_arg.size == I2C_SMBUS_BYTE)) |
| 324 | datasize = sizeof(data_arg.data->byte); |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 325 | else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | (data_arg.size == I2C_SMBUS_PROC_CALL)) |
| 327 | datasize = sizeof(data_arg.data->word); |
| 328 | else /* size == smbus block, i2c block, or block proc. call */ |
| 329 | datasize = sizeof(data_arg.data->block); |
| 330 | |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 331 | if ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 332 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | (data_arg.read_write == I2C_SMBUS_WRITE)) { |
| 334 | if (copy_from_user(&temp, data_arg.data, datasize)) |
| 335 | return -EFAULT; |
| 336 | } |
| 337 | res = i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
| 338 | data_arg.read_write, |
| 339 | data_arg.command,data_arg.size,&temp); |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 340 | if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 341 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | (data_arg.read_write == I2C_SMBUS_READ))) { |
| 343 | if (copy_to_user(data_arg.data, &temp, datasize)) |
| 344 | return -EFAULT; |
| 345 | } |
| 346 | return res; |
| 347 | |
| 348 | default: |
| 349 | return i2c_control(client,cmd,arg); |
| 350 | } |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | static int i2cdev_open(struct inode *inode, struct file *file) |
| 355 | { |
| 356 | unsigned int minor = iminor(inode); |
| 357 | struct i2c_client *client; |
| 358 | struct i2c_adapter *adap; |
| 359 | struct i2c_dev *i2c_dev; |
| 360 | |
| 361 | i2c_dev = i2c_dev_get_by_minor(minor); |
| 362 | if (!i2c_dev) |
| 363 | return -ENODEV; |
| 364 | |
| 365 | adap = i2c_get_adapter(i2c_dev->adap->nr); |
| 366 | if (!adap) |
| 367 | return -ENODEV; |
| 368 | |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 369 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | if (!client) { |
| 371 | i2c_put_adapter(adap); |
| 372 | return -ENOMEM; |
| 373 | } |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 374 | snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr); |
| 375 | client->driver = &i2cdev_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | /* registered with adapter, passed as client to user */ |
| 378 | client->adapter = adap; |
| 379 | file->private_data = client; |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static int i2cdev_release(struct inode *inode, struct file *file) |
| 385 | { |
| 386 | struct i2c_client *client = file->private_data; |
| 387 | |
| 388 | i2c_put_adapter(client->adapter); |
| 389 | kfree(client); |
| 390 | file->private_data = NULL; |
| 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | static struct file_operations i2cdev_fops = { |
| 396 | .owner = THIS_MODULE, |
| 397 | .llseek = no_llseek, |
| 398 | .read = i2cdev_read, |
| 399 | .write = i2cdev_write, |
| 400 | .ioctl = i2cdev_ioctl, |
| 401 | .open = i2cdev_open, |
| 402 | .release = i2cdev_release, |
| 403 | }; |
| 404 | |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 405 | static struct class *i2c_dev_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | static int i2cdev_attach_adapter(struct i2c_adapter *adap) |
| 408 | { |
| 409 | struct i2c_dev *i2c_dev; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 410 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | i2c_dev = get_free_i2c_dev(adap); |
| 413 | if (IS_ERR(i2c_dev)) |
| 414 | return PTR_ERR(i2c_dev); |
| 415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | /* register this i2c device with the driver core */ |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 417 | i2c_dev->dev = device_create(i2c_dev_class, &adap->dev, |
| 418 | MKDEV(I2C_MAJOR, adap->nr), |
| 419 | "i2c-%d", adap->nr); |
Akinobu Mita | 3bacb36 | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 420 | if (IS_ERR(i2c_dev->dev)) { |
| 421 | res = PTR_ERR(i2c_dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | goto error; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 423 | } |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 424 | res = device_create_file(i2c_dev->dev, &dev_attr_name); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 425 | if (res) |
| 426 | goto error_destroy; |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 427 | |
| 428 | pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", |
| 429 | adap->name, adap->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | return 0; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 431 | error_destroy: |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 432 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | error: |
| 434 | return_i2c_dev(i2c_dev); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 435 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | } |
| 437 | |
| 438 | static int i2cdev_detach_adapter(struct i2c_adapter *adap) |
| 439 | { |
| 440 | struct i2c_dev *i2c_dev; |
| 441 | |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 442 | i2c_dev = i2c_dev_get_by_minor(adap->nr); |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 443 | if (!i2c_dev) /* attach_adapter must have failed */ |
| 444 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 446 | device_remove_file(i2c_dev->dev, &dev_attr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | return_i2c_dev(i2c_dev); |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 448 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | |
Jean Delvare | b6d7b3d | 2005-07-31 19:02:53 +0200 | [diff] [blame] | 450 | pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | static int i2cdev_detach_client(struct i2c_client *client) |
| 455 | { |
| 456 | return 0; |
| 457 | } |
| 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | static struct i2c_driver i2cdev_driver = { |
Laurent Riffard | 35d8b2e | 2005-11-26 20:34:05 +0100 | [diff] [blame] | 460 | .driver = { |
Laurent Riffard | 35d8b2e | 2005-11-26 20:34:05 +0100 | [diff] [blame] | 461 | .name = "dev_driver", |
| 462 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | .id = I2C_DRIVERID_I2CDEV, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | .attach_adapter = i2cdev_attach_adapter, |
| 465 | .detach_adapter = i2cdev_detach_adapter, |
| 466 | .detach_client = i2cdev_detach_client, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | }; |
| 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | static int __init i2c_dev_init(void) |
| 470 | { |
| 471 | int res; |
| 472 | |
| 473 | printk(KERN_INFO "i2c /dev entries driver\n"); |
| 474 | |
| 475 | res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops); |
| 476 | if (res) |
| 477 | goto out; |
| 478 | |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 479 | i2c_dev_class = class_create(THIS_MODULE, "i2c-dev"); |
| 480 | if (IS_ERR(i2c_dev_class)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | goto out_unreg_chrdev; |
| 482 | |
| 483 | res = i2c_add_driver(&i2cdev_driver); |
| 484 | if (res) |
| 485 | goto out_unreg_class; |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | return 0; |
| 488 | |
| 489 | out_unreg_class: |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 490 | class_destroy(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | out_unreg_chrdev: |
| 492 | unregister_chrdev(I2C_MAJOR, "i2c"); |
| 493 | out: |
| 494 | printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); |
| 495 | return res; |
| 496 | } |
| 497 | |
| 498 | static void __exit i2c_dev_exit(void) |
| 499 | { |
| 500 | i2c_del_driver(&i2cdev_driver); |
Greg Kroah-Hartman | 7947213 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 501 | class_destroy(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | unregister_chrdev(I2C_MAJOR,"i2c"); |
| 503 | } |
| 504 | |
| 505 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
| 506 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
| 507 | MODULE_DESCRIPTION("I2C /dev entries driver"); |
| 508 | MODULE_LICENSE("GPL"); |
| 509 | |
| 510 | module_init(i2c_dev_init); |
| 511 | module_exit(i2c_dev_exit); |