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1da177e4 LT |
1 | /* |
2 | i2c-dev.c - i2c-bus driver, char device interface | |
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 | ||
29 | /* The devfs code is contributed by Philipp Matthias Hahn | |
30 | <pmhahn@titan.lahn.de> */ | |
31 | ||
1da177e4 LT |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/fs.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/smp_lock.h> | |
37 | #include <linux/devfs_fs_kernel.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/i2c.h> | |
40 | #include <linux/i2c-dev.h> | |
41 | #include <asm/uaccess.h> | |
42 | ||
43 | static struct i2c_client i2cdev_client_template; | |
44 | ||
45 | struct i2c_dev { | |
46 | int minor; | |
47 | struct i2c_adapter *adap; | |
48 | struct class_device class_dev; | |
49 | struct completion released; /* FIXME, we need a class_device_unregister() */ | |
50 | }; | |
51 | #define to_i2c_dev(d) container_of(d, struct i2c_dev, class_dev) | |
52 | ||
53 | #define I2C_MINORS 256 | |
54 | static struct i2c_dev *i2c_dev_array[I2C_MINORS]; | |
55 | static DEFINE_SPINLOCK(i2c_dev_array_lock); | |
56 | ||
57 | static struct i2c_dev *i2c_dev_get_by_minor(unsigned index) | |
58 | { | |
59 | struct i2c_dev *i2c_dev; | |
60 | ||
61 | spin_lock(&i2c_dev_array_lock); | |
62 | i2c_dev = i2c_dev_array[index]; | |
63 | spin_unlock(&i2c_dev_array_lock); | |
64 | return i2c_dev; | |
65 | } | |
66 | ||
67 | static struct i2c_dev *i2c_dev_get_by_adapter(struct i2c_adapter *adap) | |
68 | { | |
69 | struct i2c_dev *i2c_dev = NULL; | |
70 | ||
71 | spin_lock(&i2c_dev_array_lock); | |
72 | if ((i2c_dev_array[adap->nr]) && | |
73 | (i2c_dev_array[adap->nr]->adap == adap)) | |
74 | i2c_dev = i2c_dev_array[adap->nr]; | |
75 | spin_unlock(&i2c_dev_array_lock); | |
76 | return i2c_dev; | |
77 | } | |
78 | ||
79 | static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap) | |
80 | { | |
81 | struct i2c_dev *i2c_dev; | |
82 | ||
83 | i2c_dev = kmalloc(sizeof(*i2c_dev), GFP_KERNEL); | |
84 | if (!i2c_dev) | |
85 | return ERR_PTR(-ENOMEM); | |
86 | memset(i2c_dev, 0x00, sizeof(*i2c_dev)); | |
87 | ||
88 | spin_lock(&i2c_dev_array_lock); | |
89 | if (i2c_dev_array[adap->nr]) { | |
90 | spin_unlock(&i2c_dev_array_lock); | |
91 | dev_err(&adap->dev, "i2c-dev already has a device assigned to this adapter\n"); | |
92 | goto error; | |
93 | } | |
94 | i2c_dev->minor = adap->nr; | |
95 | i2c_dev_array[adap->nr] = i2c_dev; | |
96 | spin_unlock(&i2c_dev_array_lock); | |
97 | return i2c_dev; | |
98 | error: | |
99 | kfree(i2c_dev); | |
100 | return ERR_PTR(-ENODEV); | |
101 | } | |
102 | ||
103 | static void return_i2c_dev(struct i2c_dev *i2c_dev) | |
104 | { | |
105 | spin_lock(&i2c_dev_array_lock); | |
106 | i2c_dev_array[i2c_dev->minor] = NULL; | |
107 | spin_unlock(&i2c_dev_array_lock); | |
108 | } | |
109 | ||
110 | static ssize_t show_adapter_name(struct class_device *class_dev, char *buf) | |
111 | { | |
112 | struct i2c_dev *i2c_dev = to_i2c_dev(class_dev); | |
113 | return sprintf(buf, "%s\n", i2c_dev->adap->name); | |
114 | } | |
115 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); | |
116 | ||
117 | static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count, | |
118 | loff_t *offset) | |
119 | { | |
120 | char *tmp; | |
121 | int ret; | |
122 | ||
123 | struct i2c_client *client = (struct i2c_client *)file->private_data; | |
124 | ||
125 | if (count > 8192) | |
126 | count = 8192; | |
127 | ||
128 | tmp = kmalloc(count,GFP_KERNEL); | |
129 | if (tmp==NULL) | |
130 | return -ENOMEM; | |
131 | ||
132 | pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n", | |
133 | iminor(file->f_dentry->d_inode), count); | |
134 | ||
135 | ret = i2c_master_recv(client,tmp,count); | |
136 | if (ret >= 0) | |
137 | ret = copy_to_user(buf,tmp,count)?-EFAULT:ret; | |
138 | kfree(tmp); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t count, | |
143 | loff_t *offset) | |
144 | { | |
145 | int ret; | |
146 | char *tmp; | |
147 | struct i2c_client *client = (struct i2c_client *)file->private_data; | |
148 | ||
149 | if (count > 8192) | |
150 | count = 8192; | |
151 | ||
152 | tmp = kmalloc(count,GFP_KERNEL); | |
153 | if (tmp==NULL) | |
154 | return -ENOMEM; | |
155 | if (copy_from_user(tmp,buf,count)) { | |
156 | kfree(tmp); | |
157 | return -EFAULT; | |
158 | } | |
159 | ||
160 | pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n", | |
161 | iminor(file->f_dentry->d_inode), count); | |
162 | ||
163 | ret = i2c_master_send(client,tmp,count); | |
164 | kfree(tmp); | |
165 | return ret; | |
166 | } | |
167 | ||
168 | static int i2cdev_ioctl(struct inode *inode, struct file *file, | |
169 | unsigned int cmd, unsigned long arg) | |
170 | { | |
171 | struct i2c_client *client = (struct i2c_client *)file->private_data; | |
172 | struct i2c_rdwr_ioctl_data rdwr_arg; | |
173 | struct i2c_smbus_ioctl_data data_arg; | |
174 | union i2c_smbus_data temp; | |
175 | struct i2c_msg *rdwr_pa; | |
176 | u8 __user **data_ptrs; | |
177 | int i,datasize,res; | |
178 | unsigned long funcs; | |
179 | ||
180 | dev_dbg(&client->adapter->dev, "i2c-%d ioctl, cmd: 0x%x, arg: %lx.\n", | |
181 | iminor(inode),cmd, arg); | |
182 | ||
183 | switch ( cmd ) { | |
184 | case I2C_SLAVE: | |
185 | case I2C_SLAVE_FORCE: | |
186 | if ((arg > 0x3ff) || | |
187 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) | |
188 | return -EINVAL; | |
189 | if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg)) | |
190 | return -EBUSY; | |
191 | client->addr = arg; | |
192 | return 0; | |
193 | case I2C_TENBIT: | |
194 | if (arg) | |
195 | client->flags |= I2C_M_TEN; | |
196 | else | |
197 | client->flags &= ~I2C_M_TEN; | |
198 | return 0; | |
199 | case I2C_PEC: | |
200 | if (arg) | |
201 | client->flags |= I2C_CLIENT_PEC; | |
202 | else | |
203 | client->flags &= ~I2C_CLIENT_PEC; | |
204 | return 0; | |
205 | case I2C_FUNCS: | |
206 | funcs = i2c_get_functionality(client->adapter); | |
207 | return (copy_to_user((unsigned long __user *)arg, &funcs, | |
208 | sizeof(unsigned long)))?-EFAULT:0; | |
209 | ||
210 | case I2C_RDWR: | |
211 | if (copy_from_user(&rdwr_arg, | |
212 | (struct i2c_rdwr_ioctl_data __user *)arg, | |
213 | sizeof(rdwr_arg))) | |
214 | return -EFAULT; | |
215 | ||
d68a861d | 216 | /* Put an arbitrary limit on the number of messages that can |
1da177e4 LT |
217 | * be sent at once */ |
218 | if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS) | |
219 | return -EINVAL; | |
220 | ||
221 | rdwr_pa = (struct i2c_msg *) | |
222 | kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), | |
223 | GFP_KERNEL); | |
224 | ||
225 | if (rdwr_pa == NULL) return -ENOMEM; | |
226 | ||
227 | if (copy_from_user(rdwr_pa, rdwr_arg.msgs, | |
228 | rdwr_arg.nmsgs * sizeof(struct i2c_msg))) { | |
229 | kfree(rdwr_pa); | |
230 | return -EFAULT; | |
231 | } | |
232 | ||
233 | data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); | |
234 | if (data_ptrs == NULL) { | |
235 | kfree(rdwr_pa); | |
236 | return -ENOMEM; | |
237 | } | |
238 | ||
239 | res = 0; | |
240 | for( i=0; i<rdwr_arg.nmsgs; i++ ) { | |
241 | /* Limit the size of the message to a sane amount */ | |
242 | if (rdwr_pa[i].len > 8192) { | |
243 | res = -EINVAL; | |
244 | break; | |
245 | } | |
246 | data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; | |
247 | rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL); | |
248 | if(rdwr_pa[i].buf == NULL) { | |
249 | res = -ENOMEM; | |
250 | break; | |
251 | } | |
252 | if(copy_from_user(rdwr_pa[i].buf, | |
253 | data_ptrs[i], | |
254 | rdwr_pa[i].len)) { | |
255 | ++i; /* Needs to be kfreed too */ | |
256 | res = -EFAULT; | |
257 | break; | |
258 | } | |
259 | } | |
260 | if (res < 0) { | |
261 | int j; | |
262 | for (j = 0; j < i; ++j) | |
263 | kfree(rdwr_pa[j].buf); | |
264 | kfree(data_ptrs); | |
265 | kfree(rdwr_pa); | |
266 | return res; | |
267 | } | |
268 | ||
269 | res = i2c_transfer(client->adapter, | |
270 | rdwr_pa, | |
271 | rdwr_arg.nmsgs); | |
272 | while(i-- > 0) { | |
273 | if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) { | |
274 | if(copy_to_user( | |
275 | data_ptrs[i], | |
276 | rdwr_pa[i].buf, | |
277 | rdwr_pa[i].len)) { | |
278 | res = -EFAULT; | |
279 | } | |
280 | } | |
281 | kfree(rdwr_pa[i].buf); | |
282 | } | |
283 | kfree(data_ptrs); | |
284 | kfree(rdwr_pa); | |
285 | return res; | |
286 | ||
287 | case I2C_SMBUS: | |
288 | if (copy_from_user(&data_arg, | |
289 | (struct i2c_smbus_ioctl_data __user *) arg, | |
290 | sizeof(struct i2c_smbus_ioctl_data))) | |
291 | return -EFAULT; | |
292 | if ((data_arg.size != I2C_SMBUS_BYTE) && | |
293 | (data_arg.size != I2C_SMBUS_QUICK) && | |
294 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && | |
295 | (data_arg.size != I2C_SMBUS_WORD_DATA) && | |
296 | (data_arg.size != I2C_SMBUS_PROC_CALL) && | |
297 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && | |
298 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && | |
299 | (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { | |
300 | dev_dbg(&client->adapter->dev, | |
301 | "size out of range (%x) in ioctl I2C_SMBUS.\n", | |
302 | data_arg.size); | |
303 | return -EINVAL; | |
304 | } | |
305 | /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, | |
306 | so the check is valid if size==I2C_SMBUS_QUICK too. */ | |
307 | if ((data_arg.read_write != I2C_SMBUS_READ) && | |
308 | (data_arg.read_write != I2C_SMBUS_WRITE)) { | |
309 | dev_dbg(&client->adapter->dev, | |
310 | "read_write out of range (%x) in ioctl I2C_SMBUS.\n", | |
311 | data_arg.read_write); | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | /* Note that command values are always valid! */ | |
316 | ||
317 | if ((data_arg.size == I2C_SMBUS_QUICK) || | |
318 | ((data_arg.size == I2C_SMBUS_BYTE) && | |
319 | (data_arg.read_write == I2C_SMBUS_WRITE))) | |
320 | /* These are special: we do not use data */ | |
321 | return i2c_smbus_xfer(client->adapter, client->addr, | |
322 | client->flags, | |
323 | data_arg.read_write, | |
324 | data_arg.command, | |
325 | data_arg.size, NULL); | |
326 | ||
327 | if (data_arg.data == NULL) { | |
328 | dev_dbg(&client->adapter->dev, | |
329 | "data is NULL pointer in ioctl I2C_SMBUS.\n"); | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || | |
334 | (data_arg.size == I2C_SMBUS_BYTE)) | |
335 | datasize = sizeof(data_arg.data->byte); | |
336 | else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || | |
337 | (data_arg.size == I2C_SMBUS_PROC_CALL)) | |
338 | datasize = sizeof(data_arg.data->word); | |
339 | else /* size == smbus block, i2c block, or block proc. call */ | |
340 | datasize = sizeof(data_arg.data->block); | |
341 | ||
342 | if ((data_arg.size == I2C_SMBUS_PROC_CALL) || | |
343 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || | |
344 | (data_arg.read_write == I2C_SMBUS_WRITE)) { | |
345 | if (copy_from_user(&temp, data_arg.data, datasize)) | |
346 | return -EFAULT; | |
347 | } | |
348 | res = i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
349 | data_arg.read_write, | |
350 | data_arg.command,data_arg.size,&temp); | |
351 | if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || | |
352 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || | |
353 | (data_arg.read_write == I2C_SMBUS_READ))) { | |
354 | if (copy_to_user(data_arg.data, &temp, datasize)) | |
355 | return -EFAULT; | |
356 | } | |
357 | return res; | |
358 | ||
359 | default: | |
360 | return i2c_control(client,cmd,arg); | |
361 | } | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static int i2cdev_open(struct inode *inode, struct file *file) | |
366 | { | |
367 | unsigned int minor = iminor(inode); | |
368 | struct i2c_client *client; | |
369 | struct i2c_adapter *adap; | |
370 | struct i2c_dev *i2c_dev; | |
371 | ||
372 | i2c_dev = i2c_dev_get_by_minor(minor); | |
373 | if (!i2c_dev) | |
374 | return -ENODEV; | |
375 | ||
376 | adap = i2c_get_adapter(i2c_dev->adap->nr); | |
377 | if (!adap) | |
378 | return -ENODEV; | |
379 | ||
380 | client = kmalloc(sizeof(*client), GFP_KERNEL); | |
381 | if (!client) { | |
382 | i2c_put_adapter(adap); | |
383 | return -ENOMEM; | |
384 | } | |
385 | memcpy(client, &i2cdev_client_template, sizeof(*client)); | |
386 | ||
387 | /* registered with adapter, passed as client to user */ | |
388 | client->adapter = adap; | |
389 | file->private_data = client; | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | static int i2cdev_release(struct inode *inode, struct file *file) | |
395 | { | |
396 | struct i2c_client *client = file->private_data; | |
397 | ||
398 | i2c_put_adapter(client->adapter); | |
399 | kfree(client); | |
400 | file->private_data = NULL; | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | static struct file_operations i2cdev_fops = { | |
406 | .owner = THIS_MODULE, | |
407 | .llseek = no_llseek, | |
408 | .read = i2cdev_read, | |
409 | .write = i2cdev_write, | |
410 | .ioctl = i2cdev_ioctl, | |
411 | .open = i2cdev_open, | |
412 | .release = i2cdev_release, | |
413 | }; | |
414 | ||
415 | static void release_i2c_dev(struct class_device *dev) | |
416 | { | |
417 | struct i2c_dev *i2c_dev = to_i2c_dev(dev); | |
418 | complete(&i2c_dev->released); | |
419 | } | |
420 | ||
421 | static struct class i2c_dev_class = { | |
422 | .name = "i2c-dev", | |
423 | .release = &release_i2c_dev, | |
424 | }; | |
425 | ||
426 | static int i2cdev_attach_adapter(struct i2c_adapter *adap) | |
427 | { | |
428 | struct i2c_dev *i2c_dev; | |
429 | int retval; | |
430 | ||
431 | i2c_dev = get_free_i2c_dev(adap); | |
432 | if (IS_ERR(i2c_dev)) | |
433 | return PTR_ERR(i2c_dev); | |
434 | ||
435 | devfs_mk_cdev(MKDEV(I2C_MAJOR, i2c_dev->minor), | |
436 | S_IFCHR|S_IRUSR|S_IWUSR, "i2c/%d", i2c_dev->minor); | |
b6d7b3d1 JD |
437 | pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", |
438 | adap->name, i2c_dev->minor); | |
1da177e4 LT |
439 | |
440 | /* register this i2c device with the driver core */ | |
441 | i2c_dev->adap = adap; | |
442 | if (adap->dev.parent == &platform_bus) | |
443 | i2c_dev->class_dev.dev = &adap->dev; | |
444 | else | |
445 | i2c_dev->class_dev.dev = adap->dev.parent; | |
446 | i2c_dev->class_dev.class = &i2c_dev_class; | |
447 | i2c_dev->class_dev.devt = MKDEV(I2C_MAJOR, i2c_dev->minor); | |
448 | snprintf(i2c_dev->class_dev.class_id, BUS_ID_SIZE, "i2c-%d", i2c_dev->minor); | |
449 | retval = class_device_register(&i2c_dev->class_dev); | |
450 | if (retval) | |
451 | goto error; | |
452 | class_device_create_file(&i2c_dev->class_dev, &class_device_attr_name); | |
453 | return 0; | |
454 | error: | |
455 | return_i2c_dev(i2c_dev); | |
456 | kfree(i2c_dev); | |
457 | return retval; | |
458 | } | |
459 | ||
460 | static int i2cdev_detach_adapter(struct i2c_adapter *adap) | |
461 | { | |
462 | struct i2c_dev *i2c_dev; | |
463 | ||
464 | i2c_dev = i2c_dev_get_by_adapter(adap); | |
465 | if (!i2c_dev) | |
466 | return -ENODEV; | |
467 | ||
468 | init_completion(&i2c_dev->released); | |
469 | devfs_remove("i2c/%d", i2c_dev->minor); | |
470 | return_i2c_dev(i2c_dev); | |
471 | class_device_unregister(&i2c_dev->class_dev); | |
472 | wait_for_completion(&i2c_dev->released); | |
473 | kfree(i2c_dev); | |
474 | ||
b6d7b3d1 | 475 | pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); |
1da177e4 LT |
476 | return 0; |
477 | } | |
478 | ||
479 | static int i2cdev_detach_client(struct i2c_client *client) | |
480 | { | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static int i2cdev_command(struct i2c_client *client, unsigned int cmd, | |
485 | void *arg) | |
486 | { | |
487 | return -1; | |
488 | } | |
489 | ||
490 | static struct i2c_driver i2cdev_driver = { | |
491 | .owner = THIS_MODULE, | |
492 | .name = "dev_driver", | |
493 | .id = I2C_DRIVERID_I2CDEV, | |
494 | .flags = I2C_DF_NOTIFY, | |
495 | .attach_adapter = i2cdev_attach_adapter, | |
496 | .detach_adapter = i2cdev_detach_adapter, | |
497 | .detach_client = i2cdev_detach_client, | |
498 | .command = i2cdev_command, | |
499 | }; | |
500 | ||
501 | static struct i2c_client i2cdev_client_template = { | |
502 | .name = "I2C /dev entry", | |
503 | .addr = -1, | |
504 | .driver = &i2cdev_driver, | |
505 | }; | |
506 | ||
507 | static int __init i2c_dev_init(void) | |
508 | { | |
509 | int res; | |
510 | ||
511 | printk(KERN_INFO "i2c /dev entries driver\n"); | |
512 | ||
513 | res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops); | |
514 | if (res) | |
515 | goto out; | |
516 | ||
517 | res = class_register(&i2c_dev_class); | |
518 | if (res) | |
519 | goto out_unreg_chrdev; | |
520 | ||
521 | res = i2c_add_driver(&i2cdev_driver); | |
522 | if (res) | |
523 | goto out_unreg_class; | |
524 | ||
525 | devfs_mk_dir("i2c"); | |
526 | ||
527 | return 0; | |
528 | ||
529 | out_unreg_class: | |
530 | class_unregister(&i2c_dev_class); | |
531 | out_unreg_chrdev: | |
532 | unregister_chrdev(I2C_MAJOR, "i2c"); | |
533 | out: | |
534 | printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); | |
535 | return res; | |
536 | } | |
537 | ||
538 | static void __exit i2c_dev_exit(void) | |
539 | { | |
540 | i2c_del_driver(&i2cdev_driver); | |
541 | class_unregister(&i2c_dev_class); | |
542 | devfs_remove("i2c"); | |
543 | unregister_chrdev(I2C_MAJOR,"i2c"); | |
544 | } | |
545 | ||
546 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " | |
547 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); | |
548 | MODULE_DESCRIPTION("I2C /dev entries driver"); | |
549 | MODULE_LICENSE("GPL"); | |
550 | ||
551 | module_init(i2c_dev_init); | |
552 | module_exit(i2c_dev_exit); |