Commit | Line | Data |
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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 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
34 | #include <linux/init.h> |
35 | #include <linux/i2c.h> | |
36 | #include <linux/i2c-dev.h> | |
d052d1be | 37 | #include <linux/platform_device.h> |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | ||
40 | static struct i2c_client i2cdev_client_template; | |
41 | ||
42 | struct i2c_dev { | |
43 | int minor; | |
44 | struct i2c_adapter *adap; | |
45 | struct class_device class_dev; | |
46 | struct completion released; /* FIXME, we need a class_device_unregister() */ | |
47 | }; | |
48 | #define to_i2c_dev(d) container_of(d, struct i2c_dev, class_dev) | |
49 | ||
50 | #define I2C_MINORS 256 | |
51 | static struct i2c_dev *i2c_dev_array[I2C_MINORS]; | |
52 | static DEFINE_SPINLOCK(i2c_dev_array_lock); | |
53 | ||
54 | static struct i2c_dev *i2c_dev_get_by_minor(unsigned index) | |
55 | { | |
56 | struct i2c_dev *i2c_dev; | |
57 | ||
58 | spin_lock(&i2c_dev_array_lock); | |
59 | i2c_dev = i2c_dev_array[index]; | |
60 | spin_unlock(&i2c_dev_array_lock); | |
61 | return i2c_dev; | |
62 | } | |
63 | ||
64 | static struct i2c_dev *i2c_dev_get_by_adapter(struct i2c_adapter *adap) | |
65 | { | |
66 | struct i2c_dev *i2c_dev = NULL; | |
67 | ||
68 | spin_lock(&i2c_dev_array_lock); | |
69 | if ((i2c_dev_array[adap->nr]) && | |
70 | (i2c_dev_array[adap->nr]->adap == adap)) | |
71 | i2c_dev = i2c_dev_array[adap->nr]; | |
72 | spin_unlock(&i2c_dev_array_lock); | |
73 | return i2c_dev; | |
74 | } | |
75 | ||
76 | static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap) | |
77 | { | |
78 | struct i2c_dev *i2c_dev; | |
79 | ||
5263ebb5 | 80 | i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL); |
1da177e4 LT |
81 | if (!i2c_dev) |
82 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
83 | |
84 | spin_lock(&i2c_dev_array_lock); | |
85 | if (i2c_dev_array[adap->nr]) { | |
86 | spin_unlock(&i2c_dev_array_lock); | |
87 | dev_err(&adap->dev, "i2c-dev already has a device assigned to this adapter\n"); | |
88 | goto error; | |
89 | } | |
90 | i2c_dev->minor = adap->nr; | |
91 | i2c_dev_array[adap->nr] = i2c_dev; | |
92 | spin_unlock(&i2c_dev_array_lock); | |
93 | return i2c_dev; | |
94 | error: | |
95 | kfree(i2c_dev); | |
96 | return ERR_PTR(-ENODEV); | |
97 | } | |
98 | ||
99 | static void return_i2c_dev(struct i2c_dev *i2c_dev) | |
100 | { | |
101 | spin_lock(&i2c_dev_array_lock); | |
102 | i2c_dev_array[i2c_dev->minor] = NULL; | |
103 | spin_unlock(&i2c_dev_array_lock); | |
104 | } | |
105 | ||
106 | static ssize_t show_adapter_name(struct class_device *class_dev, char *buf) | |
107 | { | |
108 | struct i2c_dev *i2c_dev = to_i2c_dev(class_dev); | |
109 | return sprintf(buf, "%s\n", i2c_dev->adap->name); | |
110 | } | |
111 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); | |
112 | ||
113 | static ssize_t i2cdev_read (struct file *file, char __user *buf, size_t count, | |
114 | loff_t *offset) | |
115 | { | |
116 | char *tmp; | |
117 | int ret; | |
118 | ||
119 | struct i2c_client *client = (struct i2c_client *)file->private_data; | |
120 | ||
121 | if (count > 8192) | |
122 | count = 8192; | |
123 | ||
124 | tmp = kmalloc(count,GFP_KERNEL); | |
125 | if (tmp==NULL) | |
126 | return -ENOMEM; | |
127 | ||
128 | pr_debug("i2c-dev: i2c-%d reading %zd bytes.\n", | |
129 | iminor(file->f_dentry->d_inode), count); | |
130 | ||
131 | ret = i2c_master_recv(client,tmp,count); | |
132 | if (ret >= 0) | |
133 | ret = copy_to_user(buf,tmp,count)?-EFAULT:ret; | |
134 | kfree(tmp); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | static ssize_t i2cdev_write (struct file *file, const char __user *buf, size_t count, | |
139 | loff_t *offset) | |
140 | { | |
141 | int ret; | |
142 | char *tmp; | |
143 | struct i2c_client *client = (struct i2c_client *)file->private_data; | |
144 | ||
145 | if (count > 8192) | |
146 | count = 8192; | |
147 | ||
148 | tmp = kmalloc(count,GFP_KERNEL); | |
149 | if (tmp==NULL) | |
150 | return -ENOMEM; | |
151 | if (copy_from_user(tmp,buf,count)) { | |
152 | kfree(tmp); | |
153 | return -EFAULT; | |
154 | } | |
155 | ||
156 | pr_debug("i2c-dev: i2c-%d writing %zd bytes.\n", | |
157 | iminor(file->f_dentry->d_inode), count); | |
158 | ||
159 | ret = i2c_master_send(client,tmp,count); | |
160 | kfree(tmp); | |
161 | return ret; | |
162 | } | |
163 | ||
164 | static int i2cdev_ioctl(struct inode *inode, struct file *file, | |
165 | unsigned int cmd, unsigned long arg) | |
166 | { | |
167 | struct i2c_client *client = (struct i2c_client *)file->private_data; | |
168 | struct i2c_rdwr_ioctl_data rdwr_arg; | |
169 | struct i2c_smbus_ioctl_data data_arg; | |
170 | union i2c_smbus_data temp; | |
171 | struct i2c_msg *rdwr_pa; | |
172 | u8 __user **data_ptrs; | |
173 | int i,datasize,res; | |
174 | unsigned long funcs; | |
175 | ||
e8aafcb2 JD |
176 | dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n", |
177 | cmd, arg); | |
1da177e4 LT |
178 | |
179 | switch ( cmd ) { | |
180 | case I2C_SLAVE: | |
181 | case I2C_SLAVE_FORCE: | |
182 | if ((arg > 0x3ff) || | |
183 | (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f)) | |
184 | return -EINVAL; | |
185 | if ((cmd == I2C_SLAVE) && i2c_check_addr(client->adapter,arg)) | |
186 | return -EBUSY; | |
187 | client->addr = arg; | |
188 | return 0; | |
189 | case I2C_TENBIT: | |
190 | if (arg) | |
191 | client->flags |= I2C_M_TEN; | |
192 | else | |
193 | client->flags &= ~I2C_M_TEN; | |
194 | return 0; | |
195 | case I2C_PEC: | |
196 | if (arg) | |
197 | client->flags |= I2C_CLIENT_PEC; | |
198 | else | |
199 | client->flags &= ~I2C_CLIENT_PEC; | |
200 | return 0; | |
201 | case I2C_FUNCS: | |
202 | funcs = i2c_get_functionality(client->adapter); | |
203 | return (copy_to_user((unsigned long __user *)arg, &funcs, | |
204 | sizeof(unsigned long)))?-EFAULT:0; | |
205 | ||
206 | case I2C_RDWR: | |
207 | if (copy_from_user(&rdwr_arg, | |
208 | (struct i2c_rdwr_ioctl_data __user *)arg, | |
209 | sizeof(rdwr_arg))) | |
210 | return -EFAULT; | |
211 | ||
d68a861d | 212 | /* Put an arbitrary limit on the number of messages that can |
1da177e4 LT |
213 | * be sent at once */ |
214 | if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS) | |
215 | return -EINVAL; | |
216 | ||
217 | rdwr_pa = (struct i2c_msg *) | |
218 | kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), | |
219 | GFP_KERNEL); | |
220 | ||
221 | if (rdwr_pa == NULL) return -ENOMEM; | |
222 | ||
223 | if (copy_from_user(rdwr_pa, rdwr_arg.msgs, | |
224 | rdwr_arg.nmsgs * sizeof(struct i2c_msg))) { | |
225 | kfree(rdwr_pa); | |
226 | return -EFAULT; | |
227 | } | |
228 | ||
229 | data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); | |
230 | if (data_ptrs == NULL) { | |
231 | kfree(rdwr_pa); | |
232 | return -ENOMEM; | |
233 | } | |
234 | ||
235 | res = 0; | |
236 | for( i=0; i<rdwr_arg.nmsgs; i++ ) { | |
237 | /* Limit the size of the message to a sane amount */ | |
238 | if (rdwr_pa[i].len > 8192) { | |
239 | res = -EINVAL; | |
240 | break; | |
241 | } | |
242 | data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; | |
243 | rdwr_pa[i].buf = kmalloc(rdwr_pa[i].len, GFP_KERNEL); | |
244 | if(rdwr_pa[i].buf == NULL) { | |
245 | res = -ENOMEM; | |
246 | break; | |
247 | } | |
248 | if(copy_from_user(rdwr_pa[i].buf, | |
249 | data_ptrs[i], | |
250 | rdwr_pa[i].len)) { | |
251 | ++i; /* Needs to be kfreed too */ | |
252 | res = -EFAULT; | |
253 | break; | |
254 | } | |
255 | } | |
256 | if (res < 0) { | |
257 | int j; | |
258 | for (j = 0; j < i; ++j) | |
259 | kfree(rdwr_pa[j].buf); | |
260 | kfree(data_ptrs); | |
261 | kfree(rdwr_pa); | |
262 | return res; | |
263 | } | |
264 | ||
265 | res = i2c_transfer(client->adapter, | |
266 | rdwr_pa, | |
267 | rdwr_arg.nmsgs); | |
268 | while(i-- > 0) { | |
269 | if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD)) { | |
270 | if(copy_to_user( | |
271 | data_ptrs[i], | |
272 | rdwr_pa[i].buf, | |
273 | rdwr_pa[i].len)) { | |
274 | res = -EFAULT; | |
275 | } | |
276 | } | |
277 | kfree(rdwr_pa[i].buf); | |
278 | } | |
279 | kfree(data_ptrs); | |
280 | kfree(rdwr_pa); | |
281 | return res; | |
282 | ||
283 | case I2C_SMBUS: | |
284 | if (copy_from_user(&data_arg, | |
285 | (struct i2c_smbus_ioctl_data __user *) arg, | |
286 | sizeof(struct i2c_smbus_ioctl_data))) | |
287 | return -EFAULT; | |
288 | if ((data_arg.size != I2C_SMBUS_BYTE) && | |
289 | (data_arg.size != I2C_SMBUS_QUICK) && | |
290 | (data_arg.size != I2C_SMBUS_BYTE_DATA) && | |
291 | (data_arg.size != I2C_SMBUS_WORD_DATA) && | |
292 | (data_arg.size != I2C_SMBUS_PROC_CALL) && | |
293 | (data_arg.size != I2C_SMBUS_BLOCK_DATA) && | |
294 | (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && | |
295 | (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { | |
296 | dev_dbg(&client->adapter->dev, | |
297 | "size out of range (%x) in ioctl I2C_SMBUS.\n", | |
298 | data_arg.size); | |
299 | return -EINVAL; | |
300 | } | |
301 | /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, | |
302 | so the check is valid if size==I2C_SMBUS_QUICK too. */ | |
303 | if ((data_arg.read_write != I2C_SMBUS_READ) && | |
304 | (data_arg.read_write != I2C_SMBUS_WRITE)) { | |
305 | dev_dbg(&client->adapter->dev, | |
306 | "read_write out of range (%x) in ioctl I2C_SMBUS.\n", | |
307 | data_arg.read_write); | |
308 | return -EINVAL; | |
309 | } | |
310 | ||
311 | /* Note that command values are always valid! */ | |
312 | ||
313 | if ((data_arg.size == I2C_SMBUS_QUICK) || | |
314 | ((data_arg.size == I2C_SMBUS_BYTE) && | |
315 | (data_arg.read_write == I2C_SMBUS_WRITE))) | |
316 | /* These are special: we do not use data */ | |
317 | return i2c_smbus_xfer(client->adapter, client->addr, | |
318 | client->flags, | |
319 | data_arg.read_write, | |
320 | data_arg.command, | |
321 | data_arg.size, NULL); | |
322 | ||
323 | if (data_arg.data == NULL) { | |
324 | dev_dbg(&client->adapter->dev, | |
325 | "data is NULL pointer in ioctl I2C_SMBUS.\n"); | |
326 | return -EINVAL; | |
327 | } | |
328 | ||
329 | if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || | |
330 | (data_arg.size == I2C_SMBUS_BYTE)) | |
331 | datasize = sizeof(data_arg.data->byte); | |
332 | else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || | |
333 | (data_arg.size == I2C_SMBUS_PROC_CALL)) | |
334 | datasize = sizeof(data_arg.data->word); | |
335 | else /* size == smbus block, i2c block, or block proc. call */ | |
336 | datasize = sizeof(data_arg.data->block); | |
337 | ||
338 | if ((data_arg.size == I2C_SMBUS_PROC_CALL) || | |
339 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || | |
340 | (data_arg.read_write == I2C_SMBUS_WRITE)) { | |
341 | if (copy_from_user(&temp, data_arg.data, datasize)) | |
342 | return -EFAULT; | |
343 | } | |
344 | res = i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
345 | data_arg.read_write, | |
346 | data_arg.command,data_arg.size,&temp); | |
347 | if (! res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || | |
348 | (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || | |
349 | (data_arg.read_write == I2C_SMBUS_READ))) { | |
350 | if (copy_to_user(data_arg.data, &temp, datasize)) | |
351 | return -EFAULT; | |
352 | } | |
353 | return res; | |
354 | ||
355 | default: | |
356 | return i2c_control(client,cmd,arg); | |
357 | } | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static int i2cdev_open(struct inode *inode, struct file *file) | |
362 | { | |
363 | unsigned int minor = iminor(inode); | |
364 | struct i2c_client *client; | |
365 | struct i2c_adapter *adap; | |
366 | struct i2c_dev *i2c_dev; | |
367 | ||
368 | i2c_dev = i2c_dev_get_by_minor(minor); | |
369 | if (!i2c_dev) | |
370 | return -ENODEV; | |
371 | ||
372 | adap = i2c_get_adapter(i2c_dev->adap->nr); | |
373 | if (!adap) | |
374 | return -ENODEV; | |
375 | ||
376 | client = kmalloc(sizeof(*client), GFP_KERNEL); | |
377 | if (!client) { | |
378 | i2c_put_adapter(adap); | |
379 | return -ENOMEM; | |
380 | } | |
381 | memcpy(client, &i2cdev_client_template, sizeof(*client)); | |
382 | ||
383 | /* registered with adapter, passed as client to user */ | |
384 | client->adapter = adap; | |
385 | file->private_data = client; | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static int i2cdev_release(struct inode *inode, struct file *file) | |
391 | { | |
392 | struct i2c_client *client = file->private_data; | |
393 | ||
394 | i2c_put_adapter(client->adapter); | |
395 | kfree(client); | |
396 | file->private_data = NULL; | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | static struct file_operations i2cdev_fops = { | |
402 | .owner = THIS_MODULE, | |
403 | .llseek = no_llseek, | |
404 | .read = i2cdev_read, | |
405 | .write = i2cdev_write, | |
406 | .ioctl = i2cdev_ioctl, | |
407 | .open = i2cdev_open, | |
408 | .release = i2cdev_release, | |
409 | }; | |
410 | ||
411 | static void release_i2c_dev(struct class_device *dev) | |
412 | { | |
413 | struct i2c_dev *i2c_dev = to_i2c_dev(dev); | |
414 | complete(&i2c_dev->released); | |
415 | } | |
416 | ||
417 | static struct class i2c_dev_class = { | |
418 | .name = "i2c-dev", | |
419 | .release = &release_i2c_dev, | |
420 | }; | |
421 | ||
422 | static int i2cdev_attach_adapter(struct i2c_adapter *adap) | |
423 | { | |
424 | struct i2c_dev *i2c_dev; | |
425 | int retval; | |
426 | ||
427 | i2c_dev = get_free_i2c_dev(adap); | |
428 | if (IS_ERR(i2c_dev)) | |
429 | return PTR_ERR(i2c_dev); | |
430 | ||
b6d7b3d1 JD |
431 | pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", |
432 | adap->name, i2c_dev->minor); | |
1da177e4 LT |
433 | |
434 | /* register this i2c device with the driver core */ | |
435 | i2c_dev->adap = adap; | |
436 | if (adap->dev.parent == &platform_bus) | |
437 | i2c_dev->class_dev.dev = &adap->dev; | |
438 | else | |
439 | i2c_dev->class_dev.dev = adap->dev.parent; | |
440 | i2c_dev->class_dev.class = &i2c_dev_class; | |
441 | i2c_dev->class_dev.devt = MKDEV(I2C_MAJOR, i2c_dev->minor); | |
442 | snprintf(i2c_dev->class_dev.class_id, BUS_ID_SIZE, "i2c-%d", i2c_dev->minor); | |
443 | retval = class_device_register(&i2c_dev->class_dev); | |
444 | if (retval) | |
445 | goto error; | |
446 | class_device_create_file(&i2c_dev->class_dev, &class_device_attr_name); | |
447 | return 0; | |
448 | error: | |
449 | return_i2c_dev(i2c_dev); | |
450 | kfree(i2c_dev); | |
451 | return retval; | |
452 | } | |
453 | ||
454 | static int i2cdev_detach_adapter(struct i2c_adapter *adap) | |
455 | { | |
456 | struct i2c_dev *i2c_dev; | |
457 | ||
458 | i2c_dev = i2c_dev_get_by_adapter(adap); | |
459 | if (!i2c_dev) | |
460 | return -ENODEV; | |
461 | ||
462 | init_completion(&i2c_dev->released); | |
1da177e4 LT |
463 | return_i2c_dev(i2c_dev); |
464 | class_device_unregister(&i2c_dev->class_dev); | |
465 | wait_for_completion(&i2c_dev->released); | |
466 | kfree(i2c_dev); | |
467 | ||
b6d7b3d1 | 468 | pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name); |
1da177e4 LT |
469 | return 0; |
470 | } | |
471 | ||
472 | static int i2cdev_detach_client(struct i2c_client *client) | |
473 | { | |
474 | return 0; | |
475 | } | |
476 | ||
477 | static int i2cdev_command(struct i2c_client *client, unsigned int cmd, | |
478 | void *arg) | |
479 | { | |
480 | return -1; | |
481 | } | |
482 | ||
483 | static struct i2c_driver i2cdev_driver = { | |
35d8b2e6 | 484 | .driver = { |
35d8b2e6 LR |
485 | .name = "dev_driver", |
486 | }, | |
1da177e4 | 487 | .id = I2C_DRIVERID_I2CDEV, |
1da177e4 LT |
488 | .attach_adapter = i2cdev_attach_adapter, |
489 | .detach_adapter = i2cdev_detach_adapter, | |
490 | .detach_client = i2cdev_detach_client, | |
491 | .command = i2cdev_command, | |
492 | }; | |
493 | ||
494 | static struct i2c_client i2cdev_client_template = { | |
495 | .name = "I2C /dev entry", | |
496 | .addr = -1, | |
497 | .driver = &i2cdev_driver, | |
498 | }; | |
499 | ||
500 | static int __init i2c_dev_init(void) | |
501 | { | |
502 | int res; | |
503 | ||
504 | printk(KERN_INFO "i2c /dev entries driver\n"); | |
505 | ||
506 | res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops); | |
507 | if (res) | |
508 | goto out; | |
509 | ||
510 | res = class_register(&i2c_dev_class); | |
511 | if (res) | |
512 | goto out_unreg_chrdev; | |
513 | ||
514 | res = i2c_add_driver(&i2cdev_driver); | |
515 | if (res) | |
516 | goto out_unreg_class; | |
517 | ||
1da177e4 LT |
518 | return 0; |
519 | ||
520 | out_unreg_class: | |
521 | class_unregister(&i2c_dev_class); | |
522 | out_unreg_chrdev: | |
523 | unregister_chrdev(I2C_MAJOR, "i2c"); | |
524 | out: | |
525 | printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); | |
526 | return res; | |
527 | } | |
528 | ||
529 | static void __exit i2c_dev_exit(void) | |
530 | { | |
531 | i2c_del_driver(&i2cdev_driver); | |
532 | class_unregister(&i2c_dev_class); | |
1da177e4 LT |
533 | unregister_chrdev(I2C_MAJOR,"i2c"); |
534 | } | |
535 | ||
536 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " | |
537 | "Simon G. Vogl <simon@tk.uni-linz.ac.at>"); | |
538 | MODULE_DESCRIPTION("I2C /dev entries driver"); | |
539 | MODULE_LICENSE("GPL"); | |
540 | ||
541 | module_init(i2c_dev_init); | |
542 | module_exit(i2c_dev_exit); |