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Commit | Line | Data |
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4a62a5ab JW |
1 | /* |
2 | * LIRC base driver | |
3 | * | |
4 | * by Artur Lipowski <alipowski@interia.pl> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
4a62a5ab JW |
16 | */ |
17 | ||
3fac0314 AS |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
4a62a5ab | 20 | #include <linux/module.h> |
174cd4b1 | 21 | #include <linux/sched/signal.h> |
4a62a5ab | 22 | #include <linux/ioctl.h> |
4a62a5ab | 23 | #include <linux/poll.h> |
4a62a5ab | 24 | #include <linux/mutex.h> |
4a62a5ab JW |
25 | #include <linux/device.h> |
26 | #include <linux/cdev.h> | |
27 | ||
ca7a722d | 28 | #include <media/rc-core.h> |
4a62a5ab | 29 | #include <media/lirc.h> |
5690085e | 30 | #include <media/lirc_dev.h> |
4a62a5ab | 31 | |
4a62a5ab JW |
32 | #define NOPLUG -1 |
33 | #define LOGHEAD "lirc_dev (%s[%d]): " | |
34 | ||
35 | static dev_t lirc_base_dev; | |
36 | ||
37 | struct irctl { | |
38 | struct lirc_driver d; | |
39 | int attached; | |
40 | int open; | |
41 | ||
42 | struct mutex irctl_lock; | |
43 | struct lirc_buffer *buf; | |
0f7c4063 | 44 | bool buf_internal; |
4a62a5ab JW |
45 | unsigned int chunk_size; |
46 | ||
74c839b2 SY |
47 | struct device dev; |
48 | struct cdev cdev; | |
4a62a5ab JW |
49 | }; |
50 | ||
51 | static DEFINE_MUTEX(lirc_dev_lock); | |
52 | ||
53 | static struct irctl *irctls[MAX_IRCTL_DEVICES]; | |
54 | ||
55 | /* Only used for sysfs but defined to void otherwise */ | |
56 | static struct class *lirc_class; | |
57 | ||
74c839b2 | 58 | static void lirc_release(struct device *ld) |
4a62a5ab | 59 | { |
74c839b2 SY |
60 | struct irctl *ir = container_of(ld, struct irctl, dev); |
61 | ||
0f7c4063 | 62 | if (ir->buf_internal) { |
4a62a5ab JW |
63 | lirc_buffer_free(ir->buf); |
64 | kfree(ir->buf); | |
65 | } | |
74c839b2 SY |
66 | |
67 | mutex_lock(&lirc_dev_lock); | |
68 | irctls[ir->d.minor] = NULL; | |
69 | mutex_unlock(&lirc_dev_lock); | |
70 | kfree(ir); | |
4a62a5ab JW |
71 | } |
72 | ||
6fa99e1a | 73 | static int lirc_allocate_buffer(struct irctl *ir) |
4a62a5ab | 74 | { |
70143984 | 75 | int err = 0; |
4a62a5ab JW |
76 | int bytes_in_key; |
77 | unsigned int chunk_size; | |
78 | unsigned int buffer_size; | |
6fa99e1a AS |
79 | struct lirc_driver *d = &ir->d; |
80 | ||
81 | bytes_in_key = BITS_TO_LONGS(d->code_length) + | |
82 | (d->code_length % 8 ? 1 : 0); | |
83 | buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; | |
84 | chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; | |
85 | ||
86 | if (d->rbuf) { | |
87 | ir->buf = d->rbuf; | |
0f7c4063 | 88 | ir->buf_internal = false; |
6fa99e1a AS |
89 | } else { |
90 | ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
70143984 AS |
91 | if (!ir->buf) { |
92 | err = -ENOMEM; | |
93 | goto out; | |
94 | } | |
6fa99e1a AS |
95 | |
96 | err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); | |
97 | if (err) { | |
98 | kfree(ir->buf); | |
0f7c4063 | 99 | ir->buf = NULL; |
70143984 | 100 | goto out; |
6fa99e1a | 101 | } |
0f7c4063 DH |
102 | |
103 | ir->buf_internal = true; | |
56481f00 | 104 | d->rbuf = ir->buf; |
6fa99e1a AS |
105 | } |
106 | ir->chunk_size = ir->buf->chunk_size; | |
107 | ||
70143984 | 108 | out: |
70143984 | 109 | return err; |
6fa99e1a AS |
110 | } |
111 | ||
56481f00 | 112 | int lirc_register_driver(struct lirc_driver *d) |
6fa99e1a AS |
113 | { |
114 | struct irctl *ir; | |
115 | int minor; | |
4a62a5ab JW |
116 | int err; |
117 | ||
118 | if (!d) { | |
3fac0314 | 119 | pr_err("driver pointer must be not NULL!\n"); |
54fcecaf | 120 | return -EBADRQC; |
4a62a5ab JW |
121 | } |
122 | ||
715d29a7 | 123 | if (!d->dev) { |
3fac0314 | 124 | pr_err("dev pointer not filled in!\n"); |
54fcecaf | 125 | return -EINVAL; |
715d29a7 JW |
126 | } |
127 | ||
712551f0 DH |
128 | if (!d->fops) { |
129 | pr_err("fops pointer not filled in!\n"); | |
130 | return -EINVAL; | |
131 | } | |
132 | ||
9675ee5a | 133 | if (d->minor >= MAX_IRCTL_DEVICES) { |
3fac0314 AS |
134 | dev_err(d->dev, "minor must be between 0 and %d!\n", |
135 | MAX_IRCTL_DEVICES - 1); | |
54fcecaf | 136 | return -EBADRQC; |
4a62a5ab JW |
137 | } |
138 | ||
9675ee5a | 139 | if (d->code_length < 1 || d->code_length > (BUFLEN * 8)) { |
3fac0314 AS |
140 | dev_err(d->dev, "code length must be less than %d bits\n", |
141 | BUFLEN * 8); | |
54fcecaf | 142 | return -EBADRQC; |
4a62a5ab JW |
143 | } |
144 | ||
c3104e1b DH |
145 | if (!d->rbuf && !(d->fops && d->fops->read && |
146 | d->fops->poll && d->fops->unlocked_ioctl)) { | |
14db9fc2 | 147 | dev_err(d->dev, "undefined read, poll, ioctl\n"); |
54fcecaf | 148 | return -EBADRQC; |
4a62a5ab JW |
149 | } |
150 | ||
151 | mutex_lock(&lirc_dev_lock); | |
152 | ||
153 | minor = d->minor; | |
154 | ||
155 | if (minor < 0) { | |
156 | /* find first free slot for driver */ | |
157 | for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) | |
158 | if (!irctls[minor]) | |
159 | break; | |
9675ee5a | 160 | if (minor == MAX_IRCTL_DEVICES) { |
3fac0314 | 161 | dev_err(d->dev, "no free slots for drivers!\n"); |
4a62a5ab JW |
162 | err = -ENOMEM; |
163 | goto out_lock; | |
164 | } | |
165 | } else if (irctls[minor]) { | |
3fac0314 | 166 | dev_err(d->dev, "minor (%d) just registered!\n", minor); |
4a62a5ab JW |
167 | err = -EBUSY; |
168 | goto out_lock; | |
169 | } | |
170 | ||
171 | ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); | |
172 | if (!ir) { | |
173 | err = -ENOMEM; | |
174 | goto out_lock; | |
175 | } | |
712551f0 DH |
176 | |
177 | mutex_init(&ir->irctl_lock); | |
4a62a5ab JW |
178 | irctls[minor] = ir; |
179 | d->minor = minor; | |
180 | ||
4a62a5ab JW |
181 | /* some safety check 8-) */ |
182 | d->name[sizeof(d->name)-1] = '\0'; | |
183 | ||
4a62a5ab JW |
184 | if (d->features == 0) |
185 | d->features = LIRC_CAN_REC_LIRCCODE; | |
186 | ||
187 | ir->d = *d; | |
4a62a5ab | 188 | |
56481f00 DH |
189 | if (LIRC_CAN_REC(d->features)) { |
190 | err = lirc_allocate_buffer(irctls[minor]); | |
191 | if (err) { | |
192 | kfree(ir); | |
193 | goto out_lock; | |
194 | } | |
195 | d->rbuf = ir->buf; | |
196 | } | |
197 | ||
25823226 | 198 | device_initialize(&ir->dev); |
74c839b2 SY |
199 | ir->dev.devt = MKDEV(MAJOR(lirc_base_dev), ir->d.minor); |
200 | ir->dev.class = lirc_class; | |
201 | ir->dev.parent = d->dev; | |
202 | ir->dev.release = lirc_release; | |
203 | dev_set_name(&ir->dev, "lirc%d", ir->d.minor); | |
4a62a5ab | 204 | |
712551f0 DH |
205 | cdev_init(&ir->cdev, d->fops); |
206 | ir->cdev.owner = ir->d.owner; | |
207 | ir->cdev.kobj.parent = &ir->dev.kobj; | |
208 | ||
209 | err = cdev_add(&ir->cdev, ir->dev.devt, 1); | |
4a62a5ab | 210 | if (err) |
25823226 | 211 | goto out_free_dev; |
4a62a5ab JW |
212 | |
213 | ir->attached = 1; | |
74c839b2 SY |
214 | |
215 | err = device_add(&ir->dev); | |
216 | if (err) | |
217 | goto out_cdev; | |
218 | ||
4a62a5ab JW |
219 | mutex_unlock(&lirc_dev_lock); |
220 | ||
221 | dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", | |
222 | ir->d.name, ir->d.minor); | |
56481f00 | 223 | |
4a62a5ab | 224 | return minor; |
56481f00 | 225 | |
74c839b2 SY |
226 | out_cdev: |
227 | cdev_del(&ir->cdev); | |
25823226 | 228 | out_free_dev: |
74c839b2 | 229 | put_device(&ir->dev); |
4a62a5ab JW |
230 | out_lock: |
231 | mutex_unlock(&lirc_dev_lock); | |
54fcecaf | 232 | |
4a62a5ab JW |
233 | return err; |
234 | } | |
235 | EXPORT_SYMBOL(lirc_register_driver); | |
236 | ||
237 | int lirc_unregister_driver(int minor) | |
238 | { | |
239 | struct irctl *ir; | |
240 | ||
241 | if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { | |
3fac0314 AS |
242 | pr_err("minor (%d) must be between 0 and %d!\n", |
243 | minor, MAX_IRCTL_DEVICES - 1); | |
4a62a5ab JW |
244 | return -EBADRQC; |
245 | } | |
246 | ||
247 | ir = irctls[minor]; | |
df1868e4 | 248 | if (!ir) { |
3fac0314 | 249 | pr_err("failed to get irctl\n"); |
df1868e4 JW |
250 | return -ENOENT; |
251 | } | |
4a62a5ab JW |
252 | |
253 | mutex_lock(&lirc_dev_lock); | |
254 | ||
255 | if (ir->d.minor != minor) { | |
3fac0314 AS |
256 | dev_err(ir->d.dev, "lirc_dev: minor %d device not registered\n", |
257 | minor); | |
4a62a5ab JW |
258 | mutex_unlock(&lirc_dev_lock); |
259 | return -ENOENT; | |
260 | } | |
261 | ||
4a62a5ab JW |
262 | dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", |
263 | ir->d.name, ir->d.minor); | |
264 | ||
265 | ir->attached = 0; | |
266 | if (ir->open) { | |
267 | dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", | |
268 | ir->d.name, ir->d.minor); | |
269 | wake_up_interruptible(&ir->buf->wait_poll); | |
74c839b2 | 270 | } |
8e5fa4c6 | 271 | |
4a62a5ab JW |
272 | mutex_unlock(&lirc_dev_lock); |
273 | ||
74c839b2 SY |
274 | device_del(&ir->dev); |
275 | cdev_del(&ir->cdev); | |
276 | put_device(&ir->dev); | |
277 | ||
4a62a5ab JW |
278 | return 0; |
279 | } | |
280 | EXPORT_SYMBOL(lirc_unregister_driver); | |
281 | ||
282 | int lirc_dev_fop_open(struct inode *inode, struct file *file) | |
283 | { | |
284 | struct irctl *ir; | |
285 | int retval = 0; | |
286 | ||
287 | if (iminor(inode) >= MAX_IRCTL_DEVICES) { | |
3fac0314 | 288 | pr_err("open result for %d is -ENODEV\n", iminor(inode)); |
4a62a5ab JW |
289 | return -ENODEV; |
290 | } | |
291 | ||
292 | if (mutex_lock_interruptible(&lirc_dev_lock)) | |
293 | return -ERESTARTSYS; | |
294 | ||
295 | ir = irctls[iminor(inode)]; | |
db5b15b7 SY |
296 | mutex_unlock(&lirc_dev_lock); |
297 | ||
4a62a5ab JW |
298 | if (!ir) { |
299 | retval = -ENODEV; | |
300 | goto error; | |
301 | } | |
302 | ||
303 | dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); | |
304 | ||
305 | if (ir->d.minor == NOPLUG) { | |
306 | retval = -ENODEV; | |
307 | goto error; | |
308 | } | |
309 | ||
310 | if (ir->open) { | |
311 | retval = -EBUSY; | |
312 | goto error; | |
313 | } | |
314 | ||
ca7a722d SK |
315 | if (ir->d.rdev) { |
316 | retval = rc_open(ir->d.rdev); | |
317 | if (retval) | |
318 | goto error; | |
319 | } | |
320 | ||
2c5a1f44 DH |
321 | if (ir->buf) |
322 | lirc_buffer_clear(ir->buf); | |
323 | ||
74c839b2 | 324 | ir->open++; |
4a62a5ab JW |
325 | |
326 | error: | |
d9d2e9d5 AB |
327 | nonseekable_open(inode, file); |
328 | ||
4a62a5ab JW |
329 | return retval; |
330 | } | |
331 | EXPORT_SYMBOL(lirc_dev_fop_open); | |
332 | ||
333 | int lirc_dev_fop_close(struct inode *inode, struct file *file) | |
334 | { | |
335 | struct irctl *ir = irctls[iminor(inode)]; | |
b64e10f3 | 336 | int ret; |
4a62a5ab | 337 | |
715d29a7 | 338 | if (!ir) { |
3fac0314 | 339 | pr_err("called with invalid irctl\n"); |
715d29a7 JW |
340 | return -EINVAL; |
341 | } | |
4a62a5ab | 342 | |
b64e10f3 MCC |
343 | ret = mutex_lock_killable(&lirc_dev_lock); |
344 | WARN_ON(ret); | |
4a62a5ab | 345 | |
3dd94f00 | 346 | rc_close(ir->d.rdev); |
ca7a722d | 347 | |
715d29a7 | 348 | ir->open--; |
b64e10f3 MCC |
349 | if (!ret) |
350 | mutex_unlock(&lirc_dev_lock); | |
4a62a5ab JW |
351 | |
352 | return 0; | |
353 | } | |
354 | EXPORT_SYMBOL(lirc_dev_fop_close); | |
355 | ||
356 | unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) | |
357 | { | |
496ad9aa | 358 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
4a62a5ab JW |
359 | unsigned int ret; |
360 | ||
715d29a7 | 361 | if (!ir) { |
3fac0314 | 362 | pr_err("called with invalid irctl\n"); |
715d29a7 JW |
363 | return POLLERR; |
364 | } | |
365 | ||
5c769a68 | 366 | if (!ir->attached) |
29debf3d | 367 | return POLLHUP | POLLERR; |
4a62a5ab | 368 | |
3656cddd AS |
369 | if (ir->buf) { |
370 | poll_wait(file, &ir->buf->wait_poll, wait); | |
4a62a5ab | 371 | |
4a62a5ab JW |
372 | if (lirc_buffer_empty(ir->buf)) |
373 | ret = 0; | |
374 | else | |
375 | ret = POLLIN | POLLRDNORM; | |
3656cddd | 376 | } else |
4a62a5ab JW |
377 | ret = POLLERR; |
378 | ||
379 | dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", | |
380 | ir->d.name, ir->d.minor, ret); | |
381 | ||
382 | return ret; | |
383 | } | |
384 | EXPORT_SYMBOL(lirc_dev_fop_poll); | |
385 | ||
044e5878 | 386 | long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
4a62a5ab | 387 | { |
be1f985f | 388 | __u32 mode; |
4a62a5ab | 389 | int result = 0; |
496ad9aa | 390 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
4a62a5ab | 391 | |
8be292cc | 392 | if (!ir) { |
3fac0314 | 393 | pr_err("no irctl found!\n"); |
8be292cc JW |
394 | return -ENODEV; |
395 | } | |
4a62a5ab JW |
396 | |
397 | dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", | |
398 | ir->d.name, ir->d.minor, cmd); | |
399 | ||
400 | if (ir->d.minor == NOPLUG || !ir->attached) { | |
3fac0314 | 401 | dev_err(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", |
4a62a5ab JW |
402 | ir->d.name, ir->d.minor); |
403 | return -ENODEV; | |
404 | } | |
405 | ||
406 | mutex_lock(&ir->irctl_lock); | |
407 | ||
408 | switch (cmd) { | |
409 | case LIRC_GET_FEATURES: | |
60519af3 | 410 | result = put_user(ir->d.features, (__u32 __user *)arg); |
4a62a5ab JW |
411 | break; |
412 | case LIRC_GET_REC_MODE: | |
bd291208 | 413 | if (!LIRC_CAN_REC(ir->d.features)) { |
b4088094 | 414 | result = -ENOTTY; |
4a62a5ab JW |
415 | break; |
416 | } | |
417 | ||
418 | result = put_user(LIRC_REC2MODE | |
419 | (ir->d.features & LIRC_CAN_REC_MASK), | |
60519af3 | 420 | (__u32 __user *)arg); |
4a62a5ab JW |
421 | break; |
422 | case LIRC_SET_REC_MODE: | |
bd291208 | 423 | if (!LIRC_CAN_REC(ir->d.features)) { |
b4088094 | 424 | result = -ENOTTY; |
4a62a5ab JW |
425 | break; |
426 | } | |
427 | ||
60519af3 | 428 | result = get_user(mode, (__u32 __user *)arg); |
4a62a5ab JW |
429 | if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) |
430 | result = -EINVAL; | |
431 | /* | |
432 | * FIXME: We should actually set the mode somehow but | |
433 | * for now, lirc_serial doesn't support mode changing either | |
434 | */ | |
435 | break; | |
436 | case LIRC_GET_LENGTH: | |
60519af3 | 437 | result = put_user(ir->d.code_length, (__u32 __user *)arg); |
4a62a5ab JW |
438 | break; |
439 | case LIRC_GET_MIN_TIMEOUT: | |
440 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
441 | ir->d.min_timeout == 0) { | |
b4088094 | 442 | result = -ENOTTY; |
4a62a5ab JW |
443 | break; |
444 | } | |
445 | ||
60519af3 | 446 | result = put_user(ir->d.min_timeout, (__u32 __user *)arg); |
4a62a5ab JW |
447 | break; |
448 | case LIRC_GET_MAX_TIMEOUT: | |
449 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
450 | ir->d.max_timeout == 0) { | |
b4088094 | 451 | result = -ENOTTY; |
4a62a5ab JW |
452 | break; |
453 | } | |
454 | ||
60519af3 | 455 | result = put_user(ir->d.max_timeout, (__u32 __user *)arg); |
4a62a5ab JW |
456 | break; |
457 | default: | |
5c862758 | 458 | result = -ENOTTY; |
4a62a5ab JW |
459 | } |
460 | ||
4a62a5ab JW |
461 | mutex_unlock(&ir->irctl_lock); |
462 | ||
463 | return result; | |
464 | } | |
465 | EXPORT_SYMBOL(lirc_dev_fop_ioctl); | |
466 | ||
467 | ssize_t lirc_dev_fop_read(struct file *file, | |
0e835087 | 468 | char __user *buffer, |
4a62a5ab JW |
469 | size_t length, |
470 | loff_t *ppos) | |
471 | { | |
496ad9aa | 472 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
715d29a7 | 473 | unsigned char *buf; |
4a62a5ab JW |
474 | int ret = 0, written = 0; |
475 | DECLARE_WAITQUEUE(wait, current); | |
476 | ||
715d29a7 | 477 | if (!ir) { |
3fac0314 | 478 | pr_err("called with invalid irctl\n"); |
715d29a7 JW |
479 | return -ENODEV; |
480 | } | |
481 | ||
32002f72 SY |
482 | if (!LIRC_CAN_REC(ir->d.features)) |
483 | return -EINVAL; | |
484 | ||
4a62a5ab JW |
485 | dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); |
486 | ||
715d29a7 JW |
487 | buf = kzalloc(ir->chunk_size, GFP_KERNEL); |
488 | if (!buf) | |
489 | return -ENOMEM; | |
490 | ||
250f7a5f DC |
491 | if (mutex_lock_interruptible(&ir->irctl_lock)) { |
492 | ret = -ERESTARTSYS; | |
493 | goto out_unlocked; | |
494 | } | |
4a62a5ab | 495 | if (!ir->attached) { |
250f7a5f DC |
496 | ret = -ENODEV; |
497 | goto out_locked; | |
4a62a5ab JW |
498 | } |
499 | ||
500 | if (length % ir->chunk_size) { | |
250f7a5f DC |
501 | ret = -EINVAL; |
502 | goto out_locked; | |
4a62a5ab JW |
503 | } |
504 | ||
505 | /* | |
506 | * we add ourselves to the task queue before buffer check | |
507 | * to avoid losing scan code (in case when queue is awaken somewhere | |
508 | * between while condition checking and scheduling) | |
509 | */ | |
510 | add_wait_queue(&ir->buf->wait_poll, &wait); | |
4a62a5ab JW |
511 | |
512 | /* | |
513 | * while we didn't provide 'length' bytes, device is opened in blocking | |
514 | * mode and 'copy_to_user' is happy, wait for data. | |
515 | */ | |
516 | while (written < length && ret == 0) { | |
517 | if (lirc_buffer_empty(ir->buf)) { | |
518 | /* According to the read(2) man page, 'written' can be | |
519 | * returned as less than 'length', instead of blocking | |
520 | * again, returning -EWOULDBLOCK, or returning | |
62e92682 AS |
521 | * -ERESTARTSYS |
522 | */ | |
4a62a5ab JW |
523 | if (written) |
524 | break; | |
525 | if (file->f_flags & O_NONBLOCK) { | |
526 | ret = -EWOULDBLOCK; | |
527 | break; | |
528 | } | |
529 | if (signal_pending(current)) { | |
530 | ret = -ERESTARTSYS; | |
531 | break; | |
532 | } | |
533 | ||
534 | mutex_unlock(&ir->irctl_lock); | |
4a62a5ab | 535 | set_current_state(TASK_INTERRUPTIBLE); |
12accdcb SY |
536 | schedule(); |
537 | set_current_state(TASK_RUNNING); | |
4a62a5ab JW |
538 | |
539 | if (mutex_lock_interruptible(&ir->irctl_lock)) { | |
540 | ret = -ERESTARTSYS; | |
69c271f3 | 541 | remove_wait_queue(&ir->buf->wait_poll, &wait); |
69c271f3 | 542 | goto out_unlocked; |
4a62a5ab JW |
543 | } |
544 | ||
545 | if (!ir->attached) { | |
546 | ret = -ENODEV; | |
c77d17c0 | 547 | goto out_locked; |
4a62a5ab JW |
548 | } |
549 | } else { | |
550 | lirc_buffer_read(ir->buf, buf); | |
60519af3 | 551 | ret = copy_to_user((void __user *)buffer+written, buf, |
4a62a5ab | 552 | ir->buf->chunk_size); |
250f7a5f DC |
553 | if (!ret) |
554 | written += ir->buf->chunk_size; | |
555 | else | |
556 | ret = -EFAULT; | |
4a62a5ab JW |
557 | } |
558 | } | |
559 | ||
560 | remove_wait_queue(&ir->buf->wait_poll, &wait); | |
250f7a5f DC |
561 | |
562 | out_locked: | |
4a62a5ab JW |
563 | mutex_unlock(&ir->irctl_lock); |
564 | ||
69c271f3 | 565 | out_unlocked: |
715d29a7 | 566 | kfree(buf); |
4a62a5ab JW |
567 | |
568 | return ret ? ret : written; | |
569 | } | |
570 | EXPORT_SYMBOL(lirc_dev_fop_read); | |
571 | ||
572 | void *lirc_get_pdata(struct file *file) | |
573 | { | |
0990a97a | 574 | return irctls[iminor(file_inode(file))]->d.data; |
4a62a5ab JW |
575 | } |
576 | EXPORT_SYMBOL(lirc_get_pdata); | |
577 | ||
578 | ||
4a62a5ab JW |
579 | static int __init lirc_dev_init(void) |
580 | { | |
581 | int retval; | |
582 | ||
583 | lirc_class = class_create(THIS_MODULE, "lirc"); | |
584 | if (IS_ERR(lirc_class)) { | |
3fac0314 | 585 | pr_err("class_create failed\n"); |
54fcecaf | 586 | return PTR_ERR(lirc_class); |
4a62a5ab JW |
587 | } |
588 | ||
589 | retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, | |
463015dd | 590 | "BaseRemoteCtl"); |
4a62a5ab JW |
591 | if (retval) { |
592 | class_destroy(lirc_class); | |
3fac0314 | 593 | pr_err("alloc_chrdev_region failed\n"); |
54fcecaf | 594 | return retval; |
4a62a5ab JW |
595 | } |
596 | ||
3fac0314 AS |
597 | pr_info("IR Remote Control driver registered, major %d\n", |
598 | MAJOR(lirc_base_dev)); | |
4a62a5ab | 599 | |
54fcecaf | 600 | return 0; |
4a62a5ab JW |
601 | } |
602 | ||
4a62a5ab JW |
603 | static void __exit lirc_dev_exit(void) |
604 | { | |
605 | class_destroy(lirc_class); | |
606 | unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); | |
3fac0314 | 607 | pr_info("module unloaded\n"); |
4a62a5ab JW |
608 | } |
609 | ||
610 | module_init(lirc_dev_init); | |
611 | module_exit(lirc_dev_exit); | |
612 | ||
613 | MODULE_DESCRIPTION("LIRC base driver module"); | |
614 | MODULE_AUTHOR("Artur Lipowski"); | |
615 | MODULE_LICENSE("GPL"); |