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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 i2c-dev.c - i2c-bus driver, char device interface
4
5 Copyright (C) 1995-97 Simon G. Vogl
6 Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
7 Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
8
9*/
10
11/* Note that this is a complete rewrite of Simon Vogl's i2c-dev module.
12 But I have used so much of his original code and ideas that it seems
13 only fair to recognize him as co-author -- Frodo */
14
15/* The I2C_RDWR ioctl code is written by Kolja Waschk <waschk@telos.de> */
16
17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19#include <linux/cdev.h>
20#include <linux/compat.h>
21#include <linux/device.h>
22#include <linux/fs.h>
23#include <linux/i2c-dev.h>
24#include <linux/i2c.h>
25#include <linux/init.h>
26#include <linux/jiffies.h>
27#include <linux/kernel.h>
28#include <linux/list.h>
29#include <linux/module.h>
30#include <linux/notifier.h>
31#include <linux/slab.h>
32#include <linux/uaccess.h>
33
34/*
35 * An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a
36 * slave (i2c_client) with which messages will be exchanged. It's coupled
37 * with a character special file which is accessed by user mode drivers.
38 *
39 * The list of i2c_dev structures is parallel to the i2c_adapter lists
40 * maintained by the driver model, and is updated using bus notifications.
41 */
42struct i2c_dev {
43 struct list_head list;
44 struct i2c_adapter *adap;
45 struct device dev;
46 struct cdev cdev;
47};
48
49#define I2C_MINORS (MINORMASK + 1)
50static LIST_HEAD(i2c_dev_list);
51static DEFINE_SPINLOCK(i2c_dev_list_lock);
52
53static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
54{
55 struct i2c_dev *i2c_dev;
56
57 spin_lock(&i2c_dev_list_lock);
58 list_for_each_entry(i2c_dev, &i2c_dev_list, list) {
59 if (i2c_dev->adap->nr == index)
60 goto found;
61 }
62 i2c_dev = NULL;
63found:
64 spin_unlock(&i2c_dev_list_lock);
65 return i2c_dev;
66}
67
68static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
69{
70 struct i2c_dev *i2c_dev;
71
72 if (adap->nr >= I2C_MINORS) {
73 pr_err("Out of device minors (%d)\n", adap->nr);
74 return ERR_PTR(-ENODEV);
75 }
76
77 i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
78 if (!i2c_dev)
79 return ERR_PTR(-ENOMEM);
80 i2c_dev->adap = adap;
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);
85 return i2c_dev;
86}
87
88static void put_i2c_dev(struct i2c_dev *i2c_dev, bool del_cdev)
89{
90 spin_lock(&i2c_dev_list_lock);
91 list_del(&i2c_dev->list);
92 spin_unlock(&i2c_dev_list_lock);
93 if (del_cdev)
94 cdev_device_del(&i2c_dev->cdev, &i2c_dev->dev);
95 put_device(&i2c_dev->dev);
96}
97
98static ssize_t name_show(struct device *dev,
99 struct device_attribute *attr, char *buf)
100{
101 struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt));
102
103 if (!i2c_dev)
104 return -ENODEV;
105 return sysfs_emit(buf, "%s\n", i2c_dev->adap->name);
106}
107static DEVICE_ATTR_RO(name);
108
109static struct attribute *i2c_attrs[] = {
110 &dev_attr_name.attr,
111 NULL,
112};
113ATTRIBUTE_GROUPS(i2c);
114
115/* ------------------------------------------------------------------------- */
116
117/*
118 * After opening an instance of this character special file, a file
119 * descriptor starts out associated only with an i2c_adapter (and bus).
120 *
121 * Using the I2C_RDWR ioctl(), you can then *immediately* issue i2c_msg
122 * traffic to any devices on the bus used by that adapter. That's because
123 * the i2c_msg vectors embed all the addressing information they need, and
124 * are submitted directly to an i2c_adapter. However, SMBus-only adapters
125 * don't support that interface.
126 *
127 * To use read()/write() system calls on that file descriptor, or to use
128 * SMBus interfaces (and work with SMBus-only hosts!), you must first issue
129 * an I2C_SLAVE (or I2C_SLAVE_FORCE) ioctl. That configures an anonymous
130 * (never registered) i2c_client so it holds the addressing information
131 * needed by those system calls and by this SMBus interface.
132 */
133
134static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
135 loff_t *offset)
136{
137 char *tmp;
138 int ret;
139
140 struct i2c_client *client = file->private_data;
141
142 /* Adapter must support I2C transfers */
143 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
144 return -EOPNOTSUPP;
145
146 if (count > 8192)
147 count = 8192;
148
149 tmp = kzalloc(count, GFP_KERNEL);
150 if (tmp == NULL)
151 return -ENOMEM;
152
153 pr_debug("i2c-%d reading %zu bytes.\n", iminor(file_inode(file)), count);
154
155 ret = i2c_master_recv(client, tmp, count);
156 if (ret >= 0)
157 if (copy_to_user(buf, tmp, ret))
158 ret = -EFAULT;
159 kfree(tmp);
160 return ret;
161}
162
163static ssize_t i2cdev_write(struct file *file, const char __user *buf,
164 size_t count, loff_t *offset)
165{
166 int ret;
167 char *tmp;
168 struct i2c_client *client = file->private_data;
169
170 /* Adapter must support I2C transfers */
171 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
172 return -EOPNOTSUPP;
173
174 if (count > 8192)
175 count = 8192;
176
177 tmp = memdup_user(buf, count);
178 if (IS_ERR(tmp))
179 return PTR_ERR(tmp);
180
181 pr_debug("i2c-%d writing %zu bytes.\n", iminor(file_inode(file)), count);
182
183 ret = i2c_master_send(client, tmp, count);
184 kfree(tmp);
185 return ret;
186}
187
188static int i2cdev_check(struct device *dev, void *addrp)
189{
190 struct i2c_client *client = i2c_verify_client(dev);
191
192 if (!client || client->addr != *(unsigned int *)addrp)
193 return 0;
194
195 return dev->driver ? -EBUSY : 0;
196}
197
198/* walk up mux tree */
199static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr)
200{
201 struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
202 int result;
203
204 result = device_for_each_child(&adapter->dev, &addr, i2cdev_check);
205 if (!result && parent)
206 result = i2cdev_check_mux_parents(parent, addr);
207
208 return result;
209}
210
211/* recurse down mux tree */
212static int i2cdev_check_mux_children(struct device *dev, void *addrp)
213{
214 int result;
215
216 if (dev->type == &i2c_adapter_type)
217 result = device_for_each_child(dev, addrp,
218 i2cdev_check_mux_children);
219 else
220 result = i2cdev_check(dev, addrp);
221
222 return result;
223}
224
225/* This address checking function differs from the one in i2c-core
226 in that it considers an address with a registered device, but no
227 driver bound to it, as NOT busy. */
228static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr)
229{
230 struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
231 int result = 0;
232
233 if (parent)
234 result = i2cdev_check_mux_parents(parent, addr);
235
236 if (!result)
237 result = device_for_each_child(&adapter->dev, &addr,
238 i2cdev_check_mux_children);
239
240 return result;
241}
242
243static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client,
244 unsigned nmsgs, struct i2c_msg *msgs)
245{
246 u8 __user **data_ptrs;
247 int i, res;
248
249 /* Adapter must support I2C transfers */
250 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
251 return -EOPNOTSUPP;
252
253 data_ptrs = kmalloc_array(nmsgs, sizeof(u8 __user *), GFP_KERNEL);
254 if (!data_ptrs)
255 return -ENOMEM;
256
257 res = 0;
258 for (i = 0; i < nmsgs; i++) {
259 /* Limit the size of the message to a sane amount */
260 if (msgs[i].len > 8192) {
261 res = -EINVAL;
262 break;
263 }
264
265 data_ptrs[i] = (u8 __user *)msgs[i].buf;
266 msgs[i].buf = memdup_user(data_ptrs[i], msgs[i].len);
267 if (IS_ERR(msgs[i].buf)) {
268 res = PTR_ERR(msgs[i].buf);
269 break;
270 }
271 /* memdup_user allocates with GFP_KERNEL, so DMA is ok */
272 msgs[i].flags |= I2C_M_DMA_SAFE;
273
274 /*
275 * If the message length is received from the slave (similar
276 * to SMBus block read), we must ensure that the buffer will
277 * be large enough to cope with a message length of
278 * I2C_SMBUS_BLOCK_MAX as this is the maximum underlying bus
279 * drivers allow. The first byte in the buffer must be
280 * pre-filled with the number of extra bytes, which must be
281 * at least one to hold the message length, but can be
282 * greater (for example to account for a checksum byte at
283 * the end of the message.)
284 */
285 if (msgs[i].flags & I2C_M_RECV_LEN) {
286 if (!(msgs[i].flags & I2C_M_RD) ||
287 msgs[i].len < 1 || msgs[i].buf[0] < 1 ||
288 msgs[i].len < msgs[i].buf[0] +
289 I2C_SMBUS_BLOCK_MAX) {
290 i++;
291 res = -EINVAL;
292 break;
293 }
294
295 msgs[i].len = msgs[i].buf[0];
296 }
297 }
298 if (res < 0) {
299 int j;
300 for (j = 0; j < i; ++j)
301 kfree(msgs[j].buf);
302 kfree(data_ptrs);
303 return res;
304 }
305
306 res = i2c_transfer(client->adapter, msgs, nmsgs);
307 while (i-- > 0) {
308 if (res >= 0 && (msgs[i].flags & I2C_M_RD)) {
309 if (copy_to_user(data_ptrs[i], msgs[i].buf,
310 msgs[i].len))
311 res = -EFAULT;
312 }
313 kfree(msgs[i].buf);
314 }
315 kfree(data_ptrs);
316 return res;
317}
318
319static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
320 u8 read_write, u8 command, u32 size,
321 union i2c_smbus_data __user *data)
322{
323 union i2c_smbus_data temp = {};
324 int datasize, res;
325
326 if ((size != I2C_SMBUS_BYTE) &&
327 (size != I2C_SMBUS_QUICK) &&
328 (size != I2C_SMBUS_BYTE_DATA) &&
329 (size != I2C_SMBUS_WORD_DATA) &&
330 (size != I2C_SMBUS_PROC_CALL) &&
331 (size != I2C_SMBUS_BLOCK_DATA) &&
332 (size != I2C_SMBUS_I2C_BLOCK_BROKEN) &&
333 (size != I2C_SMBUS_I2C_BLOCK_DATA) &&
334 (size != I2C_SMBUS_BLOCK_PROC_CALL)) {
335 dev_dbg(&client->adapter->dev,
336 "size out of range (%x) in ioctl I2C_SMBUS.\n",
337 size);
338 return -EINVAL;
339 }
340 /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1,
341 so the check is valid if size==I2C_SMBUS_QUICK too. */
342 if ((read_write != I2C_SMBUS_READ) &&
343 (read_write != I2C_SMBUS_WRITE)) {
344 dev_dbg(&client->adapter->dev,
345 "read_write out of range (%x) in ioctl I2C_SMBUS.\n",
346 read_write);
347 return -EINVAL;
348 }
349
350 /* Note that command values are always valid! */
351
352 if ((size == I2C_SMBUS_QUICK) ||
353 ((size == I2C_SMBUS_BYTE) &&
354 (read_write == I2C_SMBUS_WRITE)))
355 /* These are special: we do not use data */
356 return i2c_smbus_xfer(client->adapter, client->addr,
357 client->flags, read_write,
358 command, size, NULL);
359
360 if (data == NULL) {
361 dev_dbg(&client->adapter->dev,
362 "data is NULL pointer in ioctl I2C_SMBUS.\n");
363 return -EINVAL;
364 }
365
366 if ((size == I2C_SMBUS_BYTE_DATA) ||
367 (size == I2C_SMBUS_BYTE))
368 datasize = sizeof(data->byte);
369 else if ((size == I2C_SMBUS_WORD_DATA) ||
370 (size == I2C_SMBUS_PROC_CALL))
371 datasize = sizeof(data->word);
372 else /* size == smbus block, i2c block, or block proc. call */
373 datasize = sizeof(data->block);
374
375 if ((size == I2C_SMBUS_PROC_CALL) ||
376 (size == I2C_SMBUS_BLOCK_PROC_CALL) ||
377 (size == I2C_SMBUS_I2C_BLOCK_DATA) ||
378 (read_write == I2C_SMBUS_WRITE)) {
379 if (copy_from_user(&temp, data, datasize))
380 return -EFAULT;
381 }
382 if (size == I2C_SMBUS_I2C_BLOCK_BROKEN) {
383 /* Convert old I2C block commands to the new
384 convention. This preserves binary compatibility. */
385 size = I2C_SMBUS_I2C_BLOCK_DATA;
386 if (read_write == I2C_SMBUS_READ)
387 temp.block[0] = I2C_SMBUS_BLOCK_MAX;
388 }
389 res = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
390 read_write, command, size, &temp);
391 if (!res && ((size == I2C_SMBUS_PROC_CALL) ||
392 (size == I2C_SMBUS_BLOCK_PROC_CALL) ||
393 (read_write == I2C_SMBUS_READ))) {
394 if (copy_to_user(data, &temp, datasize))
395 return -EFAULT;
396 }
397 return res;
398}
399
400static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
401{
402 struct i2c_client *client = file->private_data;
403 unsigned long funcs;
404
405 dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n",
406 cmd, arg);
407
408 switch (cmd) {
409 case I2C_SLAVE:
410 case I2C_SLAVE_FORCE:
411 if ((arg > 0x3ff) ||
412 (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
413 return -EINVAL;
414 if (cmd == I2C_SLAVE && i2cdev_check_addr(client->adapter, arg))
415 return -EBUSY;
416 /* REVISIT: address could become busy later */
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 /*
427 * Setting the PEC flag here won't affect kernel drivers,
428 * which will be using the i2c_client node registered with
429 * the driver model core. Likewise, when that client has
430 * the PEC flag already set, the i2c-dev driver won't see
431 * (or use) this setting.
432 */
433 if (arg)
434 client->flags |= I2C_CLIENT_PEC;
435 else
436 client->flags &= ~I2C_CLIENT_PEC;
437 return 0;
438 case I2C_FUNCS:
439 funcs = i2c_get_functionality(client->adapter);
440 return put_user(funcs, (unsigned long __user *)arg);
441
442 case I2C_RDWR: {
443 struct i2c_rdwr_ioctl_data rdwr_arg;
444 struct i2c_msg *rdwr_pa;
445 int res;
446
447 if (copy_from_user(&rdwr_arg,
448 (struct i2c_rdwr_ioctl_data __user *)arg,
449 sizeof(rdwr_arg)))
450 return -EFAULT;
451
452 if (!rdwr_arg.msgs || rdwr_arg.nmsgs == 0)
453 return -EINVAL;
454
455 /*
456 * Put an arbitrary limit on the number of messages that can
457 * be sent at once
458 */
459 if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
460 return -EINVAL;
461
462 rdwr_pa = memdup_array_user(rdwr_arg.msgs,
463 rdwr_arg.nmsgs, sizeof(struct i2c_msg));
464 if (IS_ERR(rdwr_pa))
465 return PTR_ERR(rdwr_pa);
466
467 res = i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
468 kfree(rdwr_pa);
469 return res;
470 }
471
472 case I2C_SMBUS: {
473 struct i2c_smbus_ioctl_data data_arg;
474 if (copy_from_user(&data_arg,
475 (struct i2c_smbus_ioctl_data __user *) arg,
476 sizeof(struct i2c_smbus_ioctl_data)))
477 return -EFAULT;
478 return i2cdev_ioctl_smbus(client, data_arg.read_write,
479 data_arg.command,
480 data_arg.size,
481 data_arg.data);
482 }
483 case I2C_RETRIES:
484 if (arg > INT_MAX)
485 return -EINVAL;
486
487 client->adapter->retries = arg;
488 break;
489 case I2C_TIMEOUT:
490 if (arg > INT_MAX)
491 return -EINVAL;
492
493 /* For historical reasons, user-space sets the timeout
494 * value in units of 10 ms.
495 */
496 client->adapter->timeout = msecs_to_jiffies(arg * 10);
497 break;
498 default:
499 /* NOTE: returning a fault code here could cause trouble
500 * in buggy userspace code. Some old kernel bugs returned
501 * zero in this case, and userspace code might accidentally
502 * have depended on that bug.
503 */
504 return -ENOTTY;
505 }
506 return 0;
507}
508
509#ifdef CONFIG_COMPAT
510
511struct i2c_smbus_ioctl_data32 {
512 u8 read_write;
513 u8 command;
514 u32 size;
515 compat_caddr_t data; /* union i2c_smbus_data *data */
516};
517
518struct i2c_msg32 {
519 u16 addr;
520 u16 flags;
521 u16 len;
522 compat_caddr_t buf;
523};
524
525struct i2c_rdwr_ioctl_data32 {
526 compat_caddr_t msgs; /* struct i2c_msg __user *msgs */
527 u32 nmsgs;
528};
529
530static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
531{
532 struct i2c_client *client = file->private_data;
533 unsigned long funcs;
534 switch (cmd) {
535 case I2C_FUNCS:
536 funcs = i2c_get_functionality(client->adapter);
537 return put_user(funcs, (compat_ulong_t __user *)arg);
538 case I2C_RDWR: {
539 struct i2c_rdwr_ioctl_data32 rdwr_arg;
540 struct i2c_msg32 __user *p;
541 struct i2c_msg *rdwr_pa;
542 int i, res;
543
544 if (copy_from_user(&rdwr_arg,
545 (struct i2c_rdwr_ioctl_data32 __user *)arg,
546 sizeof(rdwr_arg)))
547 return -EFAULT;
548
549 if (!rdwr_arg.msgs || rdwr_arg.nmsgs == 0)
550 return -EINVAL;
551
552 if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS)
553 return -EINVAL;
554
555 rdwr_pa = kmalloc_array(rdwr_arg.nmsgs, sizeof(struct i2c_msg),
556 GFP_KERNEL);
557 if (!rdwr_pa)
558 return -ENOMEM;
559
560 p = compat_ptr(rdwr_arg.msgs);
561 for (i = 0; i < rdwr_arg.nmsgs; i++) {
562 struct i2c_msg32 umsg;
563 if (copy_from_user(&umsg, p + i, sizeof(umsg))) {
564 kfree(rdwr_pa);
565 return -EFAULT;
566 }
567 rdwr_pa[i] = (struct i2c_msg) {
568 .addr = umsg.addr,
569 .flags = umsg.flags,
570 .len = umsg.len,
571 .buf = (__force __u8 *)compat_ptr(umsg.buf),
572 };
573 }
574
575 res = i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa);
576 kfree(rdwr_pa);
577 return res;
578 }
579 case I2C_SMBUS: {
580 struct i2c_smbus_ioctl_data32 data32;
581 if (copy_from_user(&data32,
582 (void __user *) arg,
583 sizeof(data32)))
584 return -EFAULT;
585 return i2cdev_ioctl_smbus(client, data32.read_write,
586 data32.command,
587 data32.size,
588 compat_ptr(data32.data));
589 }
590 default:
591 return i2cdev_ioctl(file, cmd, arg);
592 }
593}
594#else
595#define compat_i2cdev_ioctl NULL
596#endif
597
598static int i2cdev_open(struct inode *inode, struct file *file)
599{
600 unsigned int minor = iminor(inode);
601 struct i2c_client *client;
602 struct i2c_adapter *adap;
603
604 adap = i2c_get_adapter(minor);
605 if (!adap)
606 return -ENODEV;
607
608 /* This creates an anonymous i2c_client, which may later be
609 * pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE.
610 *
611 * This client is ** NEVER REGISTERED ** with the driver model
612 * or I2C core code!! It just holds private copies of addressing
613 * information and maybe a PEC flag.
614 */
615 client = kzalloc(sizeof(*client), GFP_KERNEL);
616 if (!client) {
617 i2c_put_adapter(adap);
618 return -ENOMEM;
619 }
620 snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr);
621
622 client->adapter = adap;
623 file->private_data = client;
624
625 return 0;
626}
627
628static int i2cdev_release(struct inode *inode, struct file *file)
629{
630 struct i2c_client *client = file->private_data;
631
632 i2c_put_adapter(client->adapter);
633 kfree(client);
634 file->private_data = NULL;
635
636 return 0;
637}
638
639static const struct file_operations i2cdev_fops = {
640 .owner = THIS_MODULE,
641 .read = i2cdev_read,
642 .write = i2cdev_write,
643 .unlocked_ioctl = i2cdev_ioctl,
644 .compat_ioctl = compat_i2cdev_ioctl,
645 .open = i2cdev_open,
646 .release = i2cdev_release,
647};
648
649/* ------------------------------------------------------------------------- */
650
651static const struct class i2c_dev_class = {
652 .name = "i2c-dev",
653 .dev_groups = i2c_groups,
654};
655
656static void i2cdev_dev_release(struct device *dev)
657{
658 struct i2c_dev *i2c_dev;
659
660 i2c_dev = container_of(dev, struct i2c_dev, dev);
661 kfree(i2c_dev);
662}
663
664static int i2cdev_attach_adapter(struct device *dev)
665{
666 struct i2c_adapter *adap;
667 struct i2c_dev *i2c_dev;
668 int res;
669
670 if (dev->type != &i2c_adapter_type)
671 return NOTIFY_DONE;
672 adap = to_i2c_adapter(dev);
673
674 i2c_dev = get_free_i2c_dev(adap);
675 if (IS_ERR(i2c_dev))
676 return NOTIFY_DONE;
677
678 cdev_init(&i2c_dev->cdev, &i2cdev_fops);
679 i2c_dev->cdev.owner = THIS_MODULE;
680
681 device_initialize(&i2c_dev->dev);
682 i2c_dev->dev.devt = MKDEV(I2C_MAJOR, adap->nr);
683 i2c_dev->dev.class = &i2c_dev_class;
684 i2c_dev->dev.parent = &adap->dev;
685 i2c_dev->dev.release = i2cdev_dev_release;
686
687 res = dev_set_name(&i2c_dev->dev, "i2c-%d", adap->nr);
688 if (res)
689 goto err_put_i2c_dev;
690
691 res = cdev_device_add(&i2c_dev->cdev, &i2c_dev->dev);
692 if (res)
693 goto err_put_i2c_dev;
694
695 pr_debug("adapter [%s] registered as minor %d\n", adap->name, adap->nr);
696 return NOTIFY_OK;
697
698err_put_i2c_dev:
699 put_i2c_dev(i2c_dev, false);
700 return NOTIFY_DONE;
701}
702
703static int i2cdev_detach_adapter(struct device *dev)
704{
705 struct i2c_adapter *adap;
706 struct i2c_dev *i2c_dev;
707
708 if (dev->type != &i2c_adapter_type)
709 return NOTIFY_DONE;
710 adap = to_i2c_adapter(dev);
711
712 i2c_dev = i2c_dev_get_by_minor(adap->nr);
713 if (!i2c_dev) /* attach_adapter must have failed */
714 return NOTIFY_DONE;
715
716 put_i2c_dev(i2c_dev, true);
717
718 pr_debug("adapter [%s] unregistered\n", adap->name);
719 return NOTIFY_OK;
720}
721
722static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
723 void *data)
724{
725 struct device *dev = data;
726
727 switch (action) {
728 case BUS_NOTIFY_ADD_DEVICE:
729 return i2cdev_attach_adapter(dev);
730 case BUS_NOTIFY_DEL_DEVICE:
731 return i2cdev_detach_adapter(dev);
732 }
733
734 return NOTIFY_DONE;
735}
736
737static struct notifier_block i2cdev_notifier = {
738 .notifier_call = i2cdev_notifier_call,
739};
740
741/* ------------------------------------------------------------------------- */
742
743static int __init i2c_dev_attach_adapter(struct device *dev, void *dummy)
744{
745 i2cdev_attach_adapter(dev);
746 return 0;
747}
748
749static int __exit i2c_dev_detach_adapter(struct device *dev, void *dummy)
750{
751 i2cdev_detach_adapter(dev);
752 return 0;
753}
754
755/*
756 * module load/unload record keeping
757 */
758
759static int __init i2c_dev_init(void)
760{
761 int res;
762
763 pr_info("i2c /dev entries driver\n");
764
765 res = register_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS, "i2c");
766 if (res)
767 goto out;
768
769 res = class_register(&i2c_dev_class);
770 if (res)
771 goto out_unreg_chrdev;
772
773 /* Keep track of adapters which will be added or removed later */
774 res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier);
775 if (res)
776 goto out_unreg_class;
777
778 /* Bind to already existing adapters right away */
779 i2c_for_each_dev(NULL, i2c_dev_attach_adapter);
780
781 return 0;
782
783out_unreg_class:
784 class_unregister(&i2c_dev_class);
785out_unreg_chrdev:
786 unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
787out:
788 pr_err("Driver Initialisation failed\n");
789 return res;
790}
791
792static void __exit i2c_dev_exit(void)
793{
794 bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier);
795 i2c_for_each_dev(NULL, i2c_dev_detach_adapter);
796 class_unregister(&i2c_dev_class);
797 unregister_chrdev_region(MKDEV(I2C_MAJOR, 0), I2C_MINORS);
798}
799
800MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
801MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
802MODULE_DESCRIPTION("I2C /dev entries driver");
803MODULE_LICENSE("GPL");
804
805module_init(i2c_dev_init);
806module_exit(i2c_dev_exit);
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., 51 Franklin Street, Fifth Floor, Boston,
21 MA 02110-1301 USA.
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
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/device.h>
33#include <linux/notifier.h>
34#include <linux/fs.h>
35#include <linux/slab.h>
36#include <linux/init.h>
37#include <linux/list.h>
38#include <linux/i2c.h>
39#include <linux/i2c-dev.h>
40#include <linux/jiffies.h>
41#include <linux/uaccess.h>
42
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
49 * maintained by the driver model, and is updated using bus notifications.
50 */
51struct i2c_dev {
52 struct list_head list;
53 struct i2c_adapter *adap;
54 struct device *dev;
55};
56
57#define I2C_MINORS 256
58static LIST_HEAD(i2c_dev_list);
59static DEFINE_SPINLOCK(i2c_dev_list_lock);
60
61static struct i2c_dev *i2c_dev_get_by_minor(unsigned index)
62{
63 struct i2c_dev *i2c_dev;
64
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;
71found:
72 spin_unlock(&i2c_dev_list_lock);
73 return i2c_dev;
74}
75
76static struct i2c_dev *get_free_i2c_dev(struct i2c_adapter *adap)
77{
78 struct i2c_dev *i2c_dev;
79
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
86 i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
87 if (!i2c_dev)
88 return ERR_PTR(-ENOMEM);
89 i2c_dev->adap = adap;
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);
94 return i2c_dev;
95}
96
97static void return_i2c_dev(struct i2c_dev *i2c_dev)
98{
99 spin_lock(&i2c_dev_list_lock);
100 list_del(&i2c_dev->list);
101 spin_unlock(&i2c_dev_list_lock);
102 kfree(i2c_dev);
103}
104
105static ssize_t show_adapter_name(struct device *dev,
106 struct device_attribute *attr, char *buf)
107{
108 struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt));
109
110 if (!i2c_dev)
111 return -ENODEV;
112 return sprintf(buf, "%s\n", i2c_dev->adap->name);
113}
114static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
115
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
135static ssize_t i2cdev_read(struct file *file, char __user *buf, size_t count,
136 loff_t *offset)
137{
138 char *tmp;
139 int ret;
140
141 struct i2c_client *client = file->private_data;
142
143 if (count > 8192)
144 count = 8192;
145
146 tmp = kmalloc(count, GFP_KERNEL);
147 if (tmp == NULL)
148 return -ENOMEM;
149
150 pr_debug("i2c-dev: i2c-%d reading %zu bytes.\n",
151 iminor(file->f_path.dentry->d_inode), count);
152
153 ret = i2c_master_recv(client, tmp, count);
154 if (ret >= 0)
155 ret = copy_to_user(buf, tmp, count) ? -EFAULT : ret;
156 kfree(tmp);
157 return ret;
158}
159
160static ssize_t i2cdev_write(struct file *file, const char __user *buf,
161 size_t count, loff_t *offset)
162{
163 int ret;
164 char *tmp;
165 struct i2c_client *client = file->private_data;
166
167 if (count > 8192)
168 count = 8192;
169
170 tmp = memdup_user(buf, count);
171 if (IS_ERR(tmp))
172 return PTR_ERR(tmp);
173
174 pr_debug("i2c-dev: i2c-%d writing %zu bytes.\n",
175 iminor(file->f_path.dentry->d_inode), count);
176
177 ret = i2c_master_send(client, tmp, count);
178 kfree(tmp);
179 return ret;
180}
181
182static 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
192/* walk up mux tree */
193static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr)
194{
195 struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
196 int result;
197
198 result = device_for_each_child(&adapter->dev, &addr, i2cdev_check);
199 if (!result && parent)
200 result = i2cdev_check_mux_parents(parent, addr);
201
202 return result;
203}
204
205/* recurse down mux tree */
206static 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
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
221 driver bound to it, as NOT busy. */
222static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr)
223{
224 struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter);
225 int result = 0;
226
227 if (parent)
228 result = i2cdev_check_mux_parents(parent, addr);
229
230 if (!result)
231 result = device_for_each_child(&adapter->dev, &addr,
232 i2cdev_check_mux_children);
233
234 return result;
235}
236
237static 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
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);
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 if (rdwr_pa[i].len > 8192) {
270 res = -EINVAL;
271 break;
272 }
273
274 data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf;
275 rdwr_pa[i].buf = memdup_user(data_ptrs[i], rdwr_pa[i].len);
276 if (IS_ERR(rdwr_pa[i].buf)) {
277 res = PTR_ERR(rdwr_pa[i].buf);
278 break;
279 }
280
281 /*
282 * If the message length is received from the slave (similar
283 * to SMBus block read), we must ensure that the buffer will
284 * be large enough to cope with a message length of
285 * I2C_SMBUS_BLOCK_MAX as this is the maximum underlying bus
286 * drivers allow. The first byte in the buffer must be
287 * pre-filled with the number of extra bytes, which must be
288 * at least one to hold the message length, but can be
289 * greater (for example to account for a checksum byte at
290 * the end of the message.)
291 */
292 if (rdwr_pa[i].flags & I2C_M_RECV_LEN) {
293 if (!(rdwr_pa[i].flags & I2C_M_RD) ||
294 rdwr_pa[i].buf[0] < 1 ||
295 rdwr_pa[i].len < rdwr_pa[i].buf[0] +
296 I2C_SMBUS_BLOCK_MAX) {
297 res = -EINVAL;
298 break;
299 }
300
301 rdwr_pa[i].len = rdwr_pa[i].buf[0];
302 }
303 }
304 if (res < 0) {
305 int j;
306 for (j = 0; j < i; ++j)
307 kfree(rdwr_pa[j].buf);
308 kfree(data_ptrs);
309 kfree(rdwr_pa);
310 return res;
311 }
312
313 res = i2c_transfer(client->adapter, rdwr_pa, rdwr_arg.nmsgs);
314 while (i-- > 0) {
315 if (res >= 0 && (rdwr_pa[i].flags & I2C_M_RD)) {
316 if (copy_to_user(data_ptrs[i], rdwr_pa[i].buf,
317 rdwr_pa[i].len))
318 res = -EFAULT;
319 }
320 kfree(rdwr_pa[i].buf);
321 }
322 kfree(data_ptrs);
323 kfree(rdwr_pa);
324 return res;
325}
326
327static noinline int i2cdev_ioctl_smbus(struct i2c_client *client,
328 unsigned long arg)
329{
330 struct i2c_smbus_ioctl_data data_arg;
331 union i2c_smbus_data temp;
332 int datasize, res;
333
334 if (copy_from_user(&data_arg,
335 (struct i2c_smbus_ioctl_data __user *) arg,
336 sizeof(struct i2c_smbus_ioctl_data)))
337 return -EFAULT;
338 if ((data_arg.size != I2C_SMBUS_BYTE) &&
339 (data_arg.size != I2C_SMBUS_QUICK) &&
340 (data_arg.size != I2C_SMBUS_BYTE_DATA) &&
341 (data_arg.size != I2C_SMBUS_WORD_DATA) &&
342 (data_arg.size != I2C_SMBUS_PROC_CALL) &&
343 (data_arg.size != I2C_SMBUS_BLOCK_DATA) &&
344 (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) &&
345 (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) &&
346 (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) {
347 dev_dbg(&client->adapter->dev,
348 "size out of range (%x) in ioctl I2C_SMBUS.\n",
349 data_arg.size);
350 return -EINVAL;
351 }
352 /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1,
353 so the check is valid if size==I2C_SMBUS_QUICK too. */
354 if ((data_arg.read_write != I2C_SMBUS_READ) &&
355 (data_arg.read_write != I2C_SMBUS_WRITE)) {
356 dev_dbg(&client->adapter->dev,
357 "read_write out of range (%x) in ioctl I2C_SMBUS.\n",
358 data_arg.read_write);
359 return -EINVAL;
360 }
361
362 /* Note that command values are always valid! */
363
364 if ((data_arg.size == I2C_SMBUS_QUICK) ||
365 ((data_arg.size == I2C_SMBUS_BYTE) &&
366 (data_arg.read_write == I2C_SMBUS_WRITE)))
367 /* These are special: we do not use data */
368 return i2c_smbus_xfer(client->adapter, client->addr,
369 client->flags, data_arg.read_write,
370 data_arg.command, data_arg.size, NULL);
371
372 if (data_arg.data == NULL) {
373 dev_dbg(&client->adapter->dev,
374 "data is NULL pointer in ioctl I2C_SMBUS.\n");
375 return -EINVAL;
376 }
377
378 if ((data_arg.size == I2C_SMBUS_BYTE_DATA) ||
379 (data_arg.size == I2C_SMBUS_BYTE))
380 datasize = sizeof(data_arg.data->byte);
381 else if ((data_arg.size == I2C_SMBUS_WORD_DATA) ||
382 (data_arg.size == I2C_SMBUS_PROC_CALL))
383 datasize = sizeof(data_arg.data->word);
384 else /* size == smbus block, i2c block, or block proc. call */
385 datasize = sizeof(data_arg.data->block);
386
387 if ((data_arg.size == I2C_SMBUS_PROC_CALL) ||
388 (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) ||
389 (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) ||
390 (data_arg.read_write == I2C_SMBUS_WRITE)) {
391 if (copy_from_user(&temp, data_arg.data, datasize))
392 return -EFAULT;
393 }
394 if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) {
395 /* Convert old I2C block commands to the new
396 convention. This preserves binary compatibility. */
397 data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA;
398 if (data_arg.read_write == I2C_SMBUS_READ)
399 temp.block[0] = I2C_SMBUS_BLOCK_MAX;
400 }
401 res = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
402 data_arg.read_write, data_arg.command, data_arg.size, &temp);
403 if (!res && ((data_arg.size == I2C_SMBUS_PROC_CALL) ||
404 (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) ||
405 (data_arg.read_write == I2C_SMBUS_READ))) {
406 if (copy_to_user(data_arg.data, &temp, datasize))
407 return -EFAULT;
408 }
409 return res;
410}
411
412static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
413{
414 struct i2c_client *client = file->private_data;
415 unsigned long funcs;
416
417 dev_dbg(&client->adapter->dev, "ioctl, cmd=0x%02x, arg=0x%02lx\n",
418 cmd, arg);
419
420 switch (cmd) {
421 case I2C_SLAVE:
422 case I2C_SLAVE_FORCE:
423 /* NOTE: devices set up to work with "new style" drivers
424 * can't use I2C_SLAVE, even when the device node is not
425 * bound to a driver. Only I2C_SLAVE_FORCE will work.
426 *
427 * Setting the PEC flag here won't affect kernel drivers,
428 * which will be using the i2c_client node registered with
429 * the driver model core. Likewise, when that client has
430 * the PEC flag already set, the i2c-dev driver won't see
431 * (or use) this setting.
432 */
433 if ((arg > 0x3ff) ||
434 (((client->flags & I2C_M_TEN) == 0) && arg > 0x7f))
435 return -EINVAL;
436 if (cmd == I2C_SLAVE && i2cdev_check_addr(client->adapter, arg))
437 return -EBUSY;
438 /* REVISIT: address could become busy later */
439 client->addr = arg;
440 return 0;
441 case I2C_TENBIT:
442 if (arg)
443 client->flags |= I2C_M_TEN;
444 else
445 client->flags &= ~I2C_M_TEN;
446 return 0;
447 case I2C_PEC:
448 if (arg)
449 client->flags |= I2C_CLIENT_PEC;
450 else
451 client->flags &= ~I2C_CLIENT_PEC;
452 return 0;
453 case I2C_FUNCS:
454 funcs = i2c_get_functionality(client->adapter);
455 return put_user(funcs, (unsigned long __user *)arg);
456
457 case I2C_RDWR:
458 return i2cdev_ioctl_rdrw(client, arg);
459
460 case I2C_SMBUS:
461 return i2cdev_ioctl_smbus(client, arg);
462
463 case I2C_RETRIES:
464 client->adapter->retries = arg;
465 break;
466 case I2C_TIMEOUT:
467 /* For historical reasons, user-space sets the timeout
468 * value in units of 10 ms.
469 */
470 client->adapter->timeout = msecs_to_jiffies(arg * 10);
471 break;
472 default:
473 /* NOTE: returning a fault code here could cause trouble
474 * in buggy userspace code. Some old kernel bugs returned
475 * zero in this case, and userspace code might accidentally
476 * have depended on that bug.
477 */
478 return -ENOTTY;
479 }
480 return 0;
481}
482
483static int i2cdev_open(struct inode *inode, struct file *file)
484{
485 unsigned int minor = iminor(inode);
486 struct i2c_client *client;
487 struct i2c_adapter *adap;
488 struct i2c_dev *i2c_dev;
489
490 i2c_dev = i2c_dev_get_by_minor(minor);
491 if (!i2c_dev)
492 return -ENODEV;
493
494 adap = i2c_get_adapter(i2c_dev->adap->nr);
495 if (!adap)
496 return -ENODEV;
497
498 /* This creates an anonymous i2c_client, which may later be
499 * pointed to some address using I2C_SLAVE or I2C_SLAVE_FORCE.
500 *
501 * This client is ** NEVER REGISTERED ** with the driver model
502 * or I2C core code!! It just holds private copies of addressing
503 * information and maybe a PEC flag.
504 */
505 client = kzalloc(sizeof(*client), GFP_KERNEL);
506 if (!client) {
507 i2c_put_adapter(adap);
508 return -ENOMEM;
509 }
510 snprintf(client->name, I2C_NAME_SIZE, "i2c-dev %d", adap->nr);
511
512 client->adapter = adap;
513 file->private_data = client;
514
515 return 0;
516}
517
518static int i2cdev_release(struct inode *inode, struct file *file)
519{
520 struct i2c_client *client = file->private_data;
521
522 i2c_put_adapter(client->adapter);
523 kfree(client);
524 file->private_data = NULL;
525
526 return 0;
527}
528
529static const struct file_operations i2cdev_fops = {
530 .owner = THIS_MODULE,
531 .llseek = no_llseek,
532 .read = i2cdev_read,
533 .write = i2cdev_write,
534 .unlocked_ioctl = i2cdev_ioctl,
535 .open = i2cdev_open,
536 .release = i2cdev_release,
537};
538
539/* ------------------------------------------------------------------------- */
540
541static struct class *i2c_dev_class;
542
543static int i2cdev_attach_adapter(struct device *dev, void *dummy)
544{
545 struct i2c_adapter *adap;
546 struct i2c_dev *i2c_dev;
547 int res;
548
549 if (dev->type != &i2c_adapter_type)
550 return 0;
551 adap = to_i2c_adapter(dev);
552
553 i2c_dev = get_free_i2c_dev(adap);
554 if (IS_ERR(i2c_dev))
555 return PTR_ERR(i2c_dev);
556
557 /* register this i2c device with the driver core */
558 i2c_dev->dev = device_create(i2c_dev_class, &adap->dev,
559 MKDEV(I2C_MAJOR, adap->nr), NULL,
560 "i2c-%d", adap->nr);
561 if (IS_ERR(i2c_dev->dev)) {
562 res = PTR_ERR(i2c_dev->dev);
563 goto error;
564 }
565 res = device_create_file(i2c_dev->dev, &dev_attr_name);
566 if (res)
567 goto error_destroy;
568
569 pr_debug("i2c-dev: adapter [%s] registered as minor %d\n",
570 adap->name, adap->nr);
571 return 0;
572error_destroy:
573 device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
574error:
575 return_i2c_dev(i2c_dev);
576 return res;
577}
578
579static int i2cdev_detach_adapter(struct device *dev, void *dummy)
580{
581 struct i2c_adapter *adap;
582 struct i2c_dev *i2c_dev;
583
584 if (dev->type != &i2c_adapter_type)
585 return 0;
586 adap = to_i2c_adapter(dev);
587
588 i2c_dev = i2c_dev_get_by_minor(adap->nr);
589 if (!i2c_dev) /* attach_adapter must have failed */
590 return 0;
591
592 device_remove_file(i2c_dev->dev, &dev_attr_name);
593 return_i2c_dev(i2c_dev);
594 device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
595
596 pr_debug("i2c-dev: adapter [%s] unregistered\n", adap->name);
597 return 0;
598}
599
600static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
601 void *data)
602{
603 struct device *dev = data;
604
605 switch (action) {
606 case BUS_NOTIFY_ADD_DEVICE:
607 return i2cdev_attach_adapter(dev, NULL);
608 case BUS_NOTIFY_DEL_DEVICE:
609 return i2cdev_detach_adapter(dev, NULL);
610 }
611
612 return 0;
613}
614
615static struct notifier_block i2cdev_notifier = {
616 .notifier_call = i2cdev_notifier_call,
617};
618
619/* ------------------------------------------------------------------------- */
620
621/*
622 * module load/unload record keeping
623 */
624
625static int __init i2c_dev_init(void)
626{
627 int res;
628
629 printk(KERN_INFO "i2c /dev entries driver\n");
630
631 res = register_chrdev(I2C_MAJOR, "i2c", &i2cdev_fops);
632 if (res)
633 goto out;
634
635 i2c_dev_class = class_create(THIS_MODULE, "i2c-dev");
636 if (IS_ERR(i2c_dev_class)) {
637 res = PTR_ERR(i2c_dev_class);
638 goto out_unreg_chrdev;
639 }
640
641 /* Keep track of adapters which will be added or removed later */
642 res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier);
643 if (res)
644 goto out_unreg_class;
645
646 /* Bind to already existing adapters right away */
647 i2c_for_each_dev(NULL, i2cdev_attach_adapter);
648
649 return 0;
650
651out_unreg_class:
652 class_destroy(i2c_dev_class);
653out_unreg_chrdev:
654 unregister_chrdev(I2C_MAJOR, "i2c");
655out:
656 printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__);
657 return res;
658}
659
660static void __exit i2c_dev_exit(void)
661{
662 bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier);
663 i2c_for_each_dev(NULL, i2cdev_detach_adapter);
664 class_destroy(i2c_dev_class);
665 unregister_chrdev(I2C_MAJOR, "i2c");
666}
667
668MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
669 "Simon G. Vogl <simon@tk.uni-linz.ac.at>");
670MODULE_DESCRIPTION("I2C /dev entries driver");
671MODULE_LICENSE("GPL");
672
673module_init(i2c_dev_init);
674module_exit(i2c_dev_exit);