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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/init.h> |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 34 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/i2c.h> |
| 36 | #include <linux/i2c-dev.h> |
| 37 | #include <asm/uaccess.h> |
| 38 | |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 39 | static struct i2c_driver i2cdev_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | struct i2c_dev { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 42 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | struct i2c_adapter *adap; |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 44 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #define I2C_MINORS 256 |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 48 | static LIST_HEAD(i2c_dev_list); |
| 49 | static DEFINE_SPINLOCK(i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | static struct i2c_dev *i2c_dev_get_by_minor(unsigned index) |
| 52 | { |
| 53 | struct i2c_dev *i2c_dev; |
| 54 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 55 | spin_lock(&i2c_dev_list_lock); |
| 56 | list_for_each_entry(i2c_dev, &i2c_dev_list, list) { |
| 57 | if (i2c_dev->adap->nr == index) |
| 58 | goto found; |
| 59 | } |
| 60 | i2c_dev = NULL; |
| 61 | found: |
| 62 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | return i2c_dev; |
| 64 | } |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap) |
| 67 | { |
| 68 | struct i2c_dev *i2c_dev; |
| 69 | |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 70 | if (adap->nr >= I2C_MINORS) { |
| 71 | printk(KERN_ERR "i2c-dev: Out of device minors (%d)\n", |
| 72 | adap->nr); |
| 73 | return ERR_PTR(-ENODEV); |
| 74 | } |
| 75 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 76 | i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | if (!i2c_dev) |
| 78 | return ERR_PTR(-ENOMEM); |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 79 | i2c_dev->adap = adap; |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 80 | |
| 81 | spin_lock(&i2c_dev_list_lock); |
| 82 | list_add_tail(&i2c_dev->list, &i2c_dev_list); |
| 83 | spin_unlock(&i2c_dev_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | return i2c_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static void return_i2c_dev(struct i2c_dev *i2c_dev) |
| 88 | { |
Jean Delvare | f3b3aad | 2006-07-01 17:17:38 +0200 | [diff] [blame] | 89 | spin_lock(&i2c_dev_list_lock); |
| 90 | list_del(&i2c_dev->list); |
| 91 | spin_unlock(&i2c_dev_list_lock); |
Jean Delvare | 07125ab | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 92 | kfree(i2c_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 95 | static ssize_t show_adapter_name(struct device *dev, |
| 96 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 98 | 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] | 99 | |
| 100 | if (!i2c_dev) |
| 101 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return sprintf(buf, "%s\n", i2c_dev->adap->name); |
| 103 | } |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 104 | static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
| 106 | static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count, |
| 107 | loff_t *offset) |
| 108 | { |
| 109 | char *tmp; |
| 110 | int ret; |
| 111 | |
| 112 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
| 113 | |
| 114 | if (count > 8192) |
| 115 | count = 8192; |
| 116 | |
| 117 | tmp = kmalloc(count,GFP_KERNEL); |
| 118 | if (tmp==NULL) |
| 119 | return -ENOMEM; |
| 120 | |
| 121 | pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n", |
Josef Sipek | cba0a12 | 2006-12-08 02:37:08 -0800 | [diff] [blame] | 122 | iminor(file->f_path.dentry->d_inode), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | ret = i2c_master_recv(client,tmp,count); |
| 125 | if (ret >= 0) |
| 126 | ret = copy_to_user(buf,tmp,count)?-EFAULT:ret; |
| 127 | kfree(tmp); |
| 128 | return ret; |
| 129 | } |
| 130 | |
| 131 | static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t count, |
| 132 | loff_t *offset) |
| 133 | { |
| 134 | int ret; |
| 135 | char *tmp; |
| 136 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
| 137 | |
| 138 | if (count > 8192) |
| 139 | count = 8192; |
| 140 | |
| 141 | tmp = kmalloc(count,GFP_KERNEL); |
| 142 | if (tmp==NULL) |
| 143 | return -ENOMEM; |
| 144 | if (copy_from_user(tmp,buf,count)) { |
| 145 | kfree(tmp); |
| 146 | return -EFAULT; |
| 147 | } |
| 148 | |
| 149 | pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n", |
Josef Sipek | cba0a12 | 2006-12-08 02:37:08 -0800 | [diff] [blame] | 150 | iminor(file->f_path.dentry->d_inode), count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
| 152 | ret = i2c_master_send(client,tmp,count); |
| 153 | kfree(tmp); |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | static int i2cdev_ioctl(struct inode *inode, struct file *file, |
| 158 | unsigned int cmd, unsigned long arg) |
| 159 | { |
| 160 | struct i2c_client *client = (struct i2c_client *)file->private_data; |
| 161 | struct i2c_rdwr_ioctl_data rdwr_arg; |
| 162 | struct i2c_smbus_ioctl_data data_arg; |
| 163 | union i2c_smbus_data temp; |
| 164 | struct i2c_msg *rdwr_pa; |
| 165 | u8 __user **data_ptrs; |
| 166 | int i,datasize,res; |
| 167 | unsigned long funcs; |
| 168 | |
Jean Delvare | e8aafcb | 2005-10-07 23:06:27 +0200 | [diff] [blame] | 169 | dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n", |
| 170 | cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | switch ( cmd ) { |
| 173 | case I2C_SLAVE: |
| 174 | case I2C_SLAVE_FORCE: |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 175 | if ((arg > 0x3ff) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) |
| 177 | return -EINVAL; |
| 178 | if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg)) |
| 179 | return -EBUSY; |
| 180 | client->addr = arg; |
| 181 | return 0; |
| 182 | case I2C_TENBIT: |
| 183 | if (arg) |
| 184 | client->flags |= I2C_M_TEN; |
| 185 | else |
| 186 | client->flags &= ~I2C_M_TEN; |
| 187 | return 0; |
| 188 | case I2C_PEC: |
| 189 | if (arg) |
| 190 | client->flags |= I2C_CLIENT_PEC; |
| 191 | else |
| 192 | client->flags &= ~I2C_CLIENT_PEC; |
| 193 | return 0; |
| 194 | case I2C_FUNCS: |
| 195 | funcs = i2c_get_functionality(client->adapter); |
Jean Delvare | 2c003e8 | 2006-12-10 21:21:30 +0100 | [diff] [blame] | 196 | return put_user(funcs, (unsigned long __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | case I2C_RDWR: |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 199 | if (copy_from_user(&rdwr_arg, |
| 200 | (struct i2c_rdwr_ioctl_data __user *)arg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | sizeof(rdwr_arg))) |
| 202 | return -EFAULT; |
| 203 | |
Tobias Klauser | d68a861 | 2005-05-19 21:41:47 +0200 | [diff] [blame] | 204 | /* Put an arbitrary limit on the number of messages that can |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | * be sent at once */ |
| 206 | if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS) |
| 207 | return -EINVAL; |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | rdwr_pa = (struct i2c_msg *) |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 210 | kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | GFP_KERNEL); |
| 212 | |
| 213 | if (rdwr_pa == NULL) return -ENOMEM; |
| 214 | |
| 215 | if (copy_from_user(rdwr_pa, rdwr_arg.msgs, |
| 216 | rdwr_arg.nmsgs * sizeof(struct i2c_msg))) { |
| 217 | kfree(rdwr_pa); |
| 218 | return -EFAULT; |
| 219 | } |
| 220 | |
| 221 | data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); |
| 222 | if (data_ptrs == NULL) { |
| 223 | kfree(rdwr_pa); |
| 224 | return -ENOMEM; |
| 225 | } |
| 226 | |
| 227 | res = 0; |
| 228 | for( i=0; i<rdwr_arg.nmsgs; i++ ) { |
| 229 | /* Limit the size of the message to a sane amount */ |
| 230 | if (rdwr_pa[i].len > 8192) { |
| 231 | res = -EINVAL; |
| 232 | break; |
| 233 | } |
| 234 | data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; |
| 235 | rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL); |
| 236 | if(rdwr_pa[i].buf == NULL) { |
| 237 | res = -ENOMEM; |
| 238 | break; |
| 239 | } |
| 240 | if(copy_from_user(rdwr_pa[i].buf, |
| 241 | data_ptrs[i], |
| 242 | rdwr_pa[i].len)) { |
| 243 | ++i; /* Needs to be kfreed too */ |
| 244 | res = -EFAULT; |
| 245 | break; |
| 246 | } |
| 247 | } |
| 248 | if (res < 0) { |
| 249 | int j; |
| 250 | for (j = 0; j < i; ++j) |
| 251 | kfree(rdwr_pa[j].buf); |
| 252 | kfree(data_ptrs); |
| 253 | kfree(rdwr_pa); |
| 254 | return res; |
| 255 | } |
| 256 | |
| 257 | res = i2c_transfer(client->adapter, |
| 258 | rdwr_pa, |
| 259 | rdwr_arg.nmsgs); |
| 260 | while(i-- > 0) { |
| 261 | if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) { |
| 262 | if(copy_to_user( |
| 263 | data_ptrs[i], |
| 264 | rdwr_pa[i].buf, |
| 265 | rdwr_pa[i].len)) { |
| 266 | res = -EFAULT; |
| 267 | } |
| 268 | } |
| 269 | kfree(rdwr_pa[i].buf); |
| 270 | } |
| 271 | kfree(data_ptrs); |
| 272 | kfree(rdwr_pa); |
| 273 | return res; |
| 274 | |
| 275 | case I2C_SMBUS: |
| 276 | if (copy_from_user(&data_arg, |
| 277 | (struct i2c_smbus_ioctl_data __user *) arg, |
| 278 | sizeof(struct i2c_smbus_ioctl_data))) |
| 279 | return -EFAULT; |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 280 | if ((data_arg.size != I2C_SMBUS_BYTE) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | (data_arg.size != I2C_SMBUS_QUICK) && |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 282 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | (data_arg.size != I2C_SMBUS_WORD_DATA) && |
| 284 | (data_arg.size != I2C_SMBUS_PROC_CALL) && |
| 285 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && |
Jean Delvare | 4b2643d | 2007-07-12 14:12:29 +0200 | [diff] [blame^] | 286 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) || |
Jean Delvare | 4b2643d | 2007-07-12 14:12:29 +0200 | [diff] [blame^] | 333 | (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | (data_arg.read_write == I2C_SMBUS_WRITE)) { |
| 335 | if (copy_from_user(&temp, data_arg.data, datasize)) |
| 336 | return -EFAULT; |
| 337 | } |
Jean Delvare | 4b2643d | 2007-07-12 14:12:29 +0200 | [diff] [blame^] | 338 | if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) { |
| 339 | /* Convert old I2C block commands to the new |
| 340 | convention. This preserves binary compatibility. */ |
| 341 | data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA; |
| 342 | if (data_arg.read_write == I2C_SMBUS_READ) |
| 343 | temp.block[0] = I2C_SMBUS_BLOCK_MAX; |
| 344 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | res = i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
| 346 | data_arg.read_write, |
| 347 | data_arg.command,data_arg.size,&temp); |
David Brownell | 438d6c2 | 2006-12-10 21:21:31 +0100 | [diff] [blame] | 348 | if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || |
| 349 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | (data_arg.read_write == I2C_SMBUS_READ))) { |
| 351 | if (copy_to_user(data_arg.data, &temp, datasize)) |
| 352 | return -EFAULT; |
| 353 | } |
| 354 | return res; |
| 355 | |
| 356 | default: |
| 357 | return i2c_control(client,cmd,arg); |
| 358 | } |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | static int i2cdev_open(struct inode *inode, struct file *file) |
| 363 | { |
| 364 | unsigned int minor = iminor(inode); |
| 365 | struct i2c_client *client; |
| 366 | struct i2c_adapter *adap; |
| 367 | struct i2c_dev *i2c_dev; |
| 368 | |
| 369 | i2c_dev = i2c_dev_get_by_minor(minor); |
| 370 | if (!i2c_dev) |
| 371 | return -ENODEV; |
| 372 | |
| 373 | adap = i2c_get_adapter(i2c_dev->adap->nr); |
| 374 | if (!adap) |
| 375 | return -ENODEV; |
| 376 | |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 377 | client = kzalloc(sizeof(*client), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | if (!client) { |
| 379 | i2c_put_adapter(adap); |
| 380 | return -ENOMEM; |
| 381 | } |
Jean Delvare | 22f76e7 | 2006-07-01 17:20:57 +0200 | [diff] [blame] | 382 | snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr); |
| 383 | client->driver = &i2cdev_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | /* registered with adapter, passed as client to user */ |
| 386 | client->adapter = adap; |
| 387 | file->private_data = client; |
| 388 | |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static int i2cdev_release(struct inode *inode, struct file *file) |
| 393 | { |
| 394 | struct i2c_client *client = file->private_data; |
| 395 | |
| 396 | i2c_put_adapter(client->adapter); |
| 397 | kfree(client); |
| 398 | file->private_data = NULL; |
| 399 | |
| 400 | return 0; |
| 401 | } |
| 402 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 403 | static const struct file_operations i2cdev_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | .owner = THIS_MODULE, |
| 405 | .llseek = no_llseek, |
| 406 | .read = i2cdev_read, |
| 407 | .write = i2cdev_write, |
| 408 | .ioctl = i2cdev_ioctl, |
| 409 | .open = i2cdev_open, |
| 410 | .release = i2cdev_release, |
| 411 | }; |
| 412 | |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 413 | static struct class *i2c_dev_class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
| 415 | static int i2cdev_attach_adapter(struct i2c_adapter *adap) |
| 416 | { |
| 417 | struct i2c_dev *i2c_dev; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 418 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
| 420 | i2c_dev = get_free_i2c_dev(adap); |
| 421 | if (IS_ERR(i2c_dev)) |
| 422 | return PTR_ERR(i2c_dev); |
| 423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | /* register this i2c device with the driver core */ |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 425 | i2c_dev->dev = device_create(i2c_dev_class, &adap->dev, |
| 426 | MKDEV(I2C_MAJOR, adap->nr), |
| 427 | "i2c-%d", adap->nr); |
Akinobu Mita | 3bacb36 | 2006-12-10 21:21:33 +0100 | [diff] [blame] | 428 | if (IS_ERR(i2c_dev->dev)) { |
| 429 | res = PTR_ERR(i2c_dev->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | goto error; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 431 | } |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 432 | res = device_create_file(i2c_dev->dev, &dev_attr_name); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 433 | if (res) |
| 434 | goto error_destroy; |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 435 | |
| 436 | pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", |
| 437 | adap->name, adap->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | return 0; |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 439 | error_destroy: |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 440 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | error: |
| 442 | return_i2c_dev(i2c_dev); |
Jean Delvare | defcb46 | 2006-08-15 18:30:24 +0200 | [diff] [blame] | 443 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | static int i2cdev_detach_adapter(struct i2c_adapter *adap) |
| 447 | { |
| 448 | struct i2c_dev *i2c_dev; |
| 449 | |
Jean Delvare | 9455e4c | 2006-07-01 17:16:57 +0200 | [diff] [blame] | 450 | i2c_dev = i2c_dev_get_by_minor(adap->nr); |
Jean Delvare | b32d20d | 2006-09-03 22:19:25 +0200 | [diff] [blame] | 451 | if (!i2c_dev) /* attach_adapter must have failed */ |
| 452 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 454 | device_remove_file(i2c_dev->dev, &dev_attr_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return_i2c_dev(i2c_dev); |
Greg Kroah-Hartman | ac11d06 | 2006-07-03 13:46:24 -0700 | [diff] [blame] | 456 | device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Jean Delvare | b6d7b3d | 2005-07-31 19:02:53 +0200 | [diff] [blame] | 458 | pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | static int i2cdev_detach_client(struct i2c_client *client) |
| 463 | { |
| 464 | return 0; |
| 465 | } |
| 466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | static struct i2c_driver i2cdev_driver = { |
Laurent Riffard | 35d8b2e | 2005-11-26 20:34:05 +0100 | [diff] [blame] | 468 | .driver = { |
Laurent Riffard | 35d8b2e | 2005-11-26 20:34:05 +0100 | [diff] [blame] | 469 | .name = "dev_driver", |
| 470 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | .id = I2C_DRIVERID_I2CDEV, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | .attach_adapter = i2cdev_attach_adapter, |
| 473 | .detach_adapter = i2cdev_detach_adapter, |
| 474 | .detach_client = i2cdev_detach_client, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | }; |
| 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | static int __init i2c_dev_init(void) |
| 478 | { |
| 479 | int res; |
| 480 | |
| 481 | printk(KERN_INFO "i2c /dev entries driver\n"); |
| 482 | |
| 483 | res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops); |
| 484 | if (res) |
| 485 | goto out; |
| 486 | |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 487 | i2c_dev_class = class_create(THIS_MODULE, "i2c-dev"); |
| 488 | if (IS_ERR(i2c_dev_class)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | goto out_unreg_chrdev; |
| 490 | |
| 491 | res = i2c_add_driver(&i2cdev_driver); |
| 492 | if (res) |
| 493 | goto out_unreg_class; |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | return 0; |
| 496 | |
| 497 | out_unreg_class: |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 498 | class_destroy(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | out_unreg_chrdev: |
| 500 | unregister_chrdev(I2C_MAJOR, "i2c"); |
| 501 | out: |
| 502 | printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); |
| 503 | return res; |
| 504 | } |
| 505 | |
| 506 | static void __exit i2c_dev_exit(void) |
| 507 | { |
| 508 | i2c_del_driver(&i2cdev_driver); |
Greg Kroah-Hartman | 79472132 | 2005-12-06 15:33:15 -0800 | [diff] [blame] | 509 | class_destroy(i2c_dev_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | unregister_chrdev(I2C_MAJOR,"i2c"); |
| 511 | } |
| 512 | |
| 513 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " |
| 514 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); |
| 515 | MODULE_DESCRIPTION("I2C /dev entries driver"); |
| 516 | MODULE_LICENSE("GPL"); |
| 517 | |
| 518 | module_init(i2c_dev_init); |
| 519 | module_exit(i2c_dev_exit); |