Commit | Line | Data |
---|---|---|
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 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/ioctl.h> | |
27 | #include <linux/fs.h> | |
28 | #include <linux/poll.h> | |
29 | #include <linux/completion.h> | |
4a62a5ab JW |
30 | #include <linux/mutex.h> |
31 | #include <linux/wait.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/kthread.h> | |
34 | #include <linux/bitops.h> | |
35 | #include <linux/device.h> | |
36 | #include <linux/cdev.h> | |
37 | ||
ca7a722d | 38 | #include <media/rc-core.h> |
4a62a5ab | 39 | #include <media/lirc.h> |
5690085e | 40 | #include <media/lirc_dev.h> |
4a62a5ab | 41 | |
90ab5ee9 | 42 | static bool debug; |
4a62a5ab JW |
43 | |
44 | #define IRCTL_DEV_NAME "BaseRemoteCtl" | |
45 | #define NOPLUG -1 | |
46 | #define LOGHEAD "lirc_dev (%s[%d]): " | |
47 | ||
48 | static dev_t lirc_base_dev; | |
49 | ||
50 | struct irctl { | |
51 | struct lirc_driver d; | |
52 | int attached; | |
53 | int open; | |
54 | ||
55 | struct mutex irctl_lock; | |
56 | struct lirc_buffer *buf; | |
57 | unsigned int chunk_size; | |
58 | ||
8de111e2 JW |
59 | struct cdev *cdev; |
60 | ||
4a62a5ab JW |
61 | struct task_struct *task; |
62 | long jiffies_to_wait; | |
4a62a5ab JW |
63 | }; |
64 | ||
65 | static DEFINE_MUTEX(lirc_dev_lock); | |
66 | ||
67 | static struct irctl *irctls[MAX_IRCTL_DEVICES]; | |
68 | ||
69 | /* Only used for sysfs but defined to void otherwise */ | |
70 | static struct class *lirc_class; | |
71 | ||
72 | /* helper function | |
73 | * initializes the irctl structure | |
74 | */ | |
578fcb8e | 75 | static void lirc_irctl_init(struct irctl *ir) |
4a62a5ab | 76 | { |
4a62a5ab JW |
77 | mutex_init(&ir->irctl_lock); |
78 | ir->d.minor = NOPLUG; | |
79 | } | |
80 | ||
578fcb8e | 81 | static void lirc_irctl_cleanup(struct irctl *ir) |
4a62a5ab JW |
82 | { |
83 | dev_dbg(ir->d.dev, LOGHEAD "cleaning up\n", ir->d.name, ir->d.minor); | |
84 | ||
85 | device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); | |
86 | ||
87 | if (ir->buf != ir->d.rbuf) { | |
88 | lirc_buffer_free(ir->buf); | |
89 | kfree(ir->buf); | |
90 | } | |
91 | ir->buf = NULL; | |
92 | } | |
93 | ||
94 | /* helper function | |
95 | * reads key codes from driver and puts them into buffer | |
96 | * returns 0 on success | |
97 | */ | |
578fcb8e | 98 | static int lirc_add_to_buf(struct irctl *ir) |
4a62a5ab JW |
99 | { |
100 | if (ir->d.add_to_buf) { | |
101 | int res = -ENODATA; | |
102 | int got_data = 0; | |
103 | ||
104 | /* | |
105 | * service the device as long as it is returning | |
106 | * data and we have space | |
107 | */ | |
108 | get_data: | |
109 | res = ir->d.add_to_buf(ir->d.data, ir->buf); | |
110 | if (res == 0) { | |
111 | got_data++; | |
112 | goto get_data; | |
113 | } | |
114 | ||
115 | if (res == -ENODEV) | |
116 | kthread_stop(ir->task); | |
117 | ||
118 | return got_data ? 0 : res; | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | /* main function of the polling thread | |
125 | */ | |
126 | static int lirc_thread(void *irctl) | |
127 | { | |
128 | struct irctl *ir = irctl; | |
129 | ||
130 | dev_dbg(ir->d.dev, LOGHEAD "poll thread started\n", | |
131 | ir->d.name, ir->d.minor); | |
132 | ||
133 | do { | |
134 | if (ir->open) { | |
135 | if (ir->jiffies_to_wait) { | |
136 | set_current_state(TASK_INTERRUPTIBLE); | |
137 | schedule_timeout(ir->jiffies_to_wait); | |
138 | } | |
139 | if (kthread_should_stop()) | |
140 | break; | |
578fcb8e | 141 | if (!lirc_add_to_buf(ir)) |
4a62a5ab JW |
142 | wake_up_interruptible(&ir->buf->wait_poll); |
143 | } else { | |
144 | set_current_state(TASK_INTERRUPTIBLE); | |
145 | schedule(); | |
146 | } | |
147 | } while (!kthread_should_stop()); | |
148 | ||
149 | dev_dbg(ir->d.dev, LOGHEAD "poll thread ended\n", | |
150 | ir->d.name, ir->d.minor); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | ||
75ef9de1 | 156 | static const struct file_operations lirc_dev_fops = { |
4a62a5ab JW |
157 | .owner = THIS_MODULE, |
158 | .read = lirc_dev_fop_read, | |
159 | .write = lirc_dev_fop_write, | |
160 | .poll = lirc_dev_fop_poll, | |
044e5878 | 161 | .unlocked_ioctl = lirc_dev_fop_ioctl, |
8be292cc JW |
162 | #ifdef CONFIG_COMPAT |
163 | .compat_ioctl = lirc_dev_fop_ioctl, | |
164 | #endif | |
4a62a5ab JW |
165 | .open = lirc_dev_fop_open, |
166 | .release = lirc_dev_fop_close, | |
6038f373 | 167 | .llseek = noop_llseek, |
4a62a5ab JW |
168 | }; |
169 | ||
170 | static int lirc_cdev_add(struct irctl *ir) | |
171 | { | |
8de111e2 | 172 | int retval = -ENOMEM; |
4a62a5ab | 173 | struct lirc_driver *d = &ir->d; |
8de111e2 JW |
174 | struct cdev *cdev; |
175 | ||
176 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
177 | if (!cdev) | |
178 | goto err_out; | |
4a62a5ab JW |
179 | |
180 | if (d->fops) { | |
c1cbb702 JW |
181 | cdev_init(cdev, d->fops); |
182 | cdev->owner = d->owner; | |
4a62a5ab | 183 | } else { |
c1cbb702 JW |
184 | cdev_init(cdev, &lirc_dev_fops); |
185 | cdev->owner = THIS_MODULE; | |
4a62a5ab | 186 | } |
b395cbac VK |
187 | retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor); |
188 | if (retval) | |
8de111e2 | 189 | goto err_out; |
4a62a5ab | 190 | |
c1cbb702 | 191 | retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); |
8de111e2 | 192 | if (retval) { |
c1cbb702 | 193 | kobject_put(&cdev->kobj); |
8de111e2 JW |
194 | goto err_out; |
195 | } | |
4a62a5ab | 196 | |
8de111e2 JW |
197 | ir->cdev = cdev; |
198 | ||
199 | return 0; | |
200 | ||
201 | err_out: | |
202 | kfree(cdev); | |
4a62a5ab JW |
203 | return retval; |
204 | } | |
205 | ||
206 | int lirc_register_driver(struct lirc_driver *d) | |
207 | { | |
208 | struct irctl *ir; | |
209 | int minor; | |
210 | int bytes_in_key; | |
211 | unsigned int chunk_size; | |
212 | unsigned int buffer_size; | |
213 | int err; | |
214 | ||
215 | if (!d) { | |
216 | printk(KERN_ERR "lirc_dev: lirc_register_driver: " | |
217 | "driver pointer must be not NULL!\n"); | |
218 | err = -EBADRQC; | |
219 | goto out; | |
220 | } | |
221 | ||
715d29a7 JW |
222 | if (!d->dev) { |
223 | printk(KERN_ERR "%s: dev pointer not filled in!\n", __func__); | |
224 | err = -EINVAL; | |
225 | goto out; | |
226 | } | |
227 | ||
4a62a5ab JW |
228 | if (MAX_IRCTL_DEVICES <= d->minor) { |
229 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
230 | "\"minor\" must be between 0 and %d (%d)!\n", | |
8de111e2 | 231 | MAX_IRCTL_DEVICES - 1, d->minor); |
4a62a5ab JW |
232 | err = -EBADRQC; |
233 | goto out; | |
234 | } | |
235 | ||
236 | if (1 > d->code_length || (BUFLEN * 8) < d->code_length) { | |
237 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
238 | "code length in bits for minor (%d) " | |
239 | "must be less than %d!\n", | |
240 | d->minor, BUFLEN * 8); | |
241 | err = -EBADRQC; | |
242 | goto out; | |
243 | } | |
244 | ||
245 | dev_dbg(d->dev, "lirc_dev: lirc_register_driver: sample_rate: %d\n", | |
246 | d->sample_rate); | |
247 | if (d->sample_rate) { | |
248 | if (2 > d->sample_rate || HZ < d->sample_rate) { | |
249 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
250 | "sample_rate must be between 2 and %d!\n", HZ); | |
251 | err = -EBADRQC; | |
252 | goto out; | |
253 | } | |
254 | if (!d->add_to_buf) { | |
255 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
256 | "add_to_buf cannot be NULL when " | |
257 | "sample_rate is set\n"); | |
258 | err = -EBADRQC; | |
259 | goto out; | |
260 | } | |
261 | } else if (!(d->fops && d->fops->read) && !d->rbuf) { | |
262 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
263 | "fops->read and rbuf cannot all be NULL!\n"); | |
264 | err = -EBADRQC; | |
265 | goto out; | |
266 | } else if (!d->rbuf) { | |
267 | if (!(d->fops && d->fops->read && d->fops->poll && | |
044e5878 | 268 | d->fops->unlocked_ioctl)) { |
4a62a5ab | 269 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " |
044e5878 | 270 | "neither read, poll nor unlocked_ioctl can be NULL!\n"); |
4a62a5ab JW |
271 | err = -EBADRQC; |
272 | goto out; | |
273 | } | |
274 | } | |
275 | ||
276 | mutex_lock(&lirc_dev_lock); | |
277 | ||
278 | minor = d->minor; | |
279 | ||
280 | if (minor < 0) { | |
281 | /* find first free slot for driver */ | |
282 | for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) | |
283 | if (!irctls[minor]) | |
284 | break; | |
285 | if (MAX_IRCTL_DEVICES == minor) { | |
286 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
287 | "no free slots for drivers!\n"); | |
288 | err = -ENOMEM; | |
289 | goto out_lock; | |
290 | } | |
291 | } else if (irctls[minor]) { | |
292 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
293 | "minor (%d) just registered!\n", minor); | |
294 | err = -EBUSY; | |
295 | goto out_lock; | |
296 | } | |
297 | ||
298 | ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); | |
299 | if (!ir) { | |
300 | err = -ENOMEM; | |
301 | goto out_lock; | |
302 | } | |
578fcb8e | 303 | lirc_irctl_init(ir); |
4a62a5ab JW |
304 | irctls[minor] = ir; |
305 | d->minor = minor; | |
306 | ||
307 | if (d->sample_rate) { | |
308 | ir->jiffies_to_wait = HZ / d->sample_rate; | |
309 | } else { | |
310 | /* it means - wait for external event in task queue */ | |
311 | ir->jiffies_to_wait = 0; | |
312 | } | |
313 | ||
314 | /* some safety check 8-) */ | |
315 | d->name[sizeof(d->name)-1] = '\0'; | |
316 | ||
317 | bytes_in_key = BITS_TO_LONGS(d->code_length) + | |
318 | (d->code_length % 8 ? 1 : 0); | |
319 | buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; | |
320 | chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; | |
321 | ||
322 | if (d->rbuf) { | |
323 | ir->buf = d->rbuf; | |
324 | } else { | |
325 | ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
326 | if (!ir->buf) { | |
327 | err = -ENOMEM; | |
328 | goto out_lock; | |
329 | } | |
330 | err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); | |
331 | if (err) { | |
332 | kfree(ir->buf); | |
333 | goto out_lock; | |
334 | } | |
335 | } | |
336 | ir->chunk_size = ir->buf->chunk_size; | |
337 | ||
338 | if (d->features == 0) | |
339 | d->features = LIRC_CAN_REC_LIRCCODE; | |
340 | ||
341 | ir->d = *d; | |
4a62a5ab JW |
342 | |
343 | device_create(lirc_class, ir->d.dev, | |
344 | MKDEV(MAJOR(lirc_base_dev), ir->d.minor), NULL, | |
345 | "lirc%u", ir->d.minor); | |
346 | ||
347 | if (d->sample_rate) { | |
348 | /* try to fire up polling thread */ | |
349 | ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev"); | |
350 | if (IS_ERR(ir->task)) { | |
351 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
352 | "cannot run poll thread for minor = %d\n", | |
353 | d->minor); | |
354 | err = -ECHILD; | |
355 | goto out_sysfs; | |
356 | } | |
357 | } | |
358 | ||
359 | err = lirc_cdev_add(ir); | |
360 | if (err) | |
361 | goto out_sysfs; | |
362 | ||
363 | ir->attached = 1; | |
364 | mutex_unlock(&lirc_dev_lock); | |
365 | ||
366 | dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", | |
367 | ir->d.name, ir->d.minor); | |
368 | return minor; | |
369 | ||
370 | out_sysfs: | |
371 | device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); | |
372 | out_lock: | |
373 | mutex_unlock(&lirc_dev_lock); | |
374 | out: | |
375 | return err; | |
376 | } | |
377 | EXPORT_SYMBOL(lirc_register_driver); | |
378 | ||
379 | int lirc_unregister_driver(int minor) | |
380 | { | |
381 | struct irctl *ir; | |
c1cbb702 | 382 | struct cdev *cdev; |
4a62a5ab JW |
383 | |
384 | if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { | |
4fc21543 | 385 | printk(KERN_ERR "lirc_dev: %s: minor (%d) must be between " |
8de111e2 | 386 | "0 and %d!\n", __func__, minor, MAX_IRCTL_DEVICES - 1); |
4a62a5ab JW |
387 | return -EBADRQC; |
388 | } | |
389 | ||
390 | ir = irctls[minor]; | |
df1868e4 | 391 | if (!ir) { |
4fc21543 JW |
392 | printk(KERN_ERR "lirc_dev: %s: failed to get irctl struct " |
393 | "for minor %d!\n", __func__, minor); | |
df1868e4 JW |
394 | return -ENOENT; |
395 | } | |
4a62a5ab | 396 | |
8de111e2 | 397 | cdev = ir->cdev; |
4a62a5ab JW |
398 | |
399 | mutex_lock(&lirc_dev_lock); | |
400 | ||
401 | if (ir->d.minor != minor) { | |
4fc21543 JW |
402 | printk(KERN_ERR "lirc_dev: %s: minor (%d) device not " |
403 | "registered!\n", __func__, minor); | |
4a62a5ab JW |
404 | mutex_unlock(&lirc_dev_lock); |
405 | return -ENOENT; | |
406 | } | |
407 | ||
408 | /* end up polling thread */ | |
409 | if (ir->task) | |
410 | kthread_stop(ir->task); | |
411 | ||
412 | dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", | |
413 | ir->d.name, ir->d.minor); | |
414 | ||
415 | ir->attached = 0; | |
416 | if (ir->open) { | |
417 | dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", | |
418 | ir->d.name, ir->d.minor); | |
419 | wake_up_interruptible(&ir->buf->wait_poll); | |
420 | mutex_lock(&ir->irctl_lock); | |
421 | ir->d.set_use_dec(ir->d.data); | |
c1cbb702 | 422 | module_put(cdev->owner); |
4a62a5ab | 423 | mutex_unlock(&ir->irctl_lock); |
4a62a5ab | 424 | } else { |
578fcb8e | 425 | lirc_irctl_cleanup(ir); |
c1cbb702 | 426 | cdev_del(cdev); |
8de111e2 | 427 | kfree(cdev); |
4a62a5ab JW |
428 | kfree(ir); |
429 | irctls[minor] = NULL; | |
430 | } | |
431 | ||
432 | mutex_unlock(&lirc_dev_lock); | |
433 | ||
434 | return 0; | |
435 | } | |
436 | EXPORT_SYMBOL(lirc_unregister_driver); | |
437 | ||
438 | int lirc_dev_fop_open(struct inode *inode, struct file *file) | |
439 | { | |
440 | struct irctl *ir; | |
c1cbb702 | 441 | struct cdev *cdev; |
4a62a5ab JW |
442 | int retval = 0; |
443 | ||
444 | if (iminor(inode) >= MAX_IRCTL_DEVICES) { | |
445 | printk(KERN_WARNING "lirc_dev [%d]: open result = -ENODEV\n", | |
446 | iminor(inode)); | |
447 | return -ENODEV; | |
448 | } | |
449 | ||
450 | if (mutex_lock_interruptible(&lirc_dev_lock)) | |
451 | return -ERESTARTSYS; | |
452 | ||
453 | ir = irctls[iminor(inode)]; | |
454 | if (!ir) { | |
455 | retval = -ENODEV; | |
456 | goto error; | |
457 | } | |
458 | ||
459 | dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); | |
460 | ||
461 | if (ir->d.minor == NOPLUG) { | |
462 | retval = -ENODEV; | |
463 | goto error; | |
464 | } | |
465 | ||
466 | if (ir->open) { | |
467 | retval = -EBUSY; | |
468 | goto error; | |
469 | } | |
470 | ||
ca7a722d SK |
471 | if (ir->d.rdev) { |
472 | retval = rc_open(ir->d.rdev); | |
473 | if (retval) | |
474 | goto error; | |
475 | } | |
476 | ||
8de111e2 | 477 | cdev = ir->cdev; |
c1cbb702 JW |
478 | if (try_module_get(cdev->owner)) { |
479 | ir->open++; | |
4a62a5ab JW |
480 | retval = ir->d.set_use_inc(ir->d.data); |
481 | ||
482 | if (retval) { | |
c1cbb702 JW |
483 | module_put(cdev->owner); |
484 | ir->open--; | |
4a62a5ab JW |
485 | } else { |
486 | lirc_buffer_clear(ir->buf); | |
487 | } | |
488 | if (ir->task) | |
489 | wake_up_process(ir->task); | |
490 | } | |
491 | ||
492 | error: | |
493 | if (ir) | |
494 | dev_dbg(ir->d.dev, LOGHEAD "open result = %d\n", | |
495 | ir->d.name, ir->d.minor, retval); | |
496 | ||
497 | mutex_unlock(&lirc_dev_lock); | |
498 | ||
d9d2e9d5 AB |
499 | nonseekable_open(inode, file); |
500 | ||
4a62a5ab JW |
501 | return retval; |
502 | } | |
503 | EXPORT_SYMBOL(lirc_dev_fop_open); | |
504 | ||
505 | int lirc_dev_fop_close(struct inode *inode, struct file *file) | |
506 | { | |
507 | struct irctl *ir = irctls[iminor(inode)]; | |
8de111e2 | 508 | struct cdev *cdev; |
b64e10f3 | 509 | int ret; |
4a62a5ab | 510 | |
715d29a7 JW |
511 | if (!ir) { |
512 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
513 | return -EINVAL; | |
514 | } | |
4a62a5ab | 515 | |
8de111e2 JW |
516 | cdev = ir->cdev; |
517 | ||
4a62a5ab JW |
518 | dev_dbg(ir->d.dev, LOGHEAD "close called\n", ir->d.name, ir->d.minor); |
519 | ||
b64e10f3 MCC |
520 | ret = mutex_lock_killable(&lirc_dev_lock); |
521 | WARN_ON(ret); | |
4a62a5ab | 522 | |
3dd94f00 | 523 | rc_close(ir->d.rdev); |
ca7a722d | 524 | |
715d29a7 | 525 | ir->open--; |
4a62a5ab JW |
526 | if (ir->attached) { |
527 | ir->d.set_use_dec(ir->d.data); | |
c1cbb702 | 528 | module_put(cdev->owner); |
4a62a5ab | 529 | } else { |
578fcb8e | 530 | lirc_irctl_cleanup(ir); |
c1cbb702 | 531 | cdev_del(cdev); |
4a62a5ab | 532 | irctls[ir->d.minor] = NULL; |
8de111e2 | 533 | kfree(cdev); |
4a62a5ab JW |
534 | kfree(ir); |
535 | } | |
536 | ||
b64e10f3 MCC |
537 | if (!ret) |
538 | mutex_unlock(&lirc_dev_lock); | |
4a62a5ab JW |
539 | |
540 | return 0; | |
541 | } | |
542 | EXPORT_SYMBOL(lirc_dev_fop_close); | |
543 | ||
544 | unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) | |
545 | { | |
496ad9aa | 546 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
4a62a5ab JW |
547 | unsigned int ret; |
548 | ||
715d29a7 JW |
549 | if (!ir) { |
550 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
551 | return POLLERR; | |
552 | } | |
553 | ||
4a62a5ab JW |
554 | dev_dbg(ir->d.dev, LOGHEAD "poll called\n", ir->d.name, ir->d.minor); |
555 | ||
5c769a68 | 556 | if (!ir->attached) |
4a62a5ab | 557 | return POLLERR; |
4a62a5ab | 558 | |
3656cddd AS |
559 | if (ir->buf) { |
560 | poll_wait(file, &ir->buf->wait_poll, wait); | |
4a62a5ab | 561 | |
4a62a5ab JW |
562 | if (lirc_buffer_empty(ir->buf)) |
563 | ret = 0; | |
564 | else | |
565 | ret = POLLIN | POLLRDNORM; | |
3656cddd | 566 | } else |
4a62a5ab JW |
567 | ret = POLLERR; |
568 | ||
569 | dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", | |
570 | ir->d.name, ir->d.minor, ret); | |
571 | ||
572 | return ret; | |
573 | } | |
574 | EXPORT_SYMBOL(lirc_dev_fop_poll); | |
575 | ||
044e5878 | 576 | long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
4a62a5ab | 577 | { |
be1f985f | 578 | __u32 mode; |
4a62a5ab | 579 | int result = 0; |
496ad9aa | 580 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
4a62a5ab | 581 | |
8be292cc JW |
582 | if (!ir) { |
583 | printk(KERN_ERR "lirc_dev: %s: no irctl found!\n", __func__); | |
584 | return -ENODEV; | |
585 | } | |
4a62a5ab JW |
586 | |
587 | dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", | |
588 | ir->d.name, ir->d.minor, cmd); | |
589 | ||
590 | if (ir->d.minor == NOPLUG || !ir->attached) { | |
591 | dev_dbg(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", | |
592 | ir->d.name, ir->d.minor); | |
593 | return -ENODEV; | |
594 | } | |
595 | ||
596 | mutex_lock(&ir->irctl_lock); | |
597 | ||
598 | switch (cmd) { | |
599 | case LIRC_GET_FEATURES: | |
60519af3 | 600 | result = put_user(ir->d.features, (__u32 __user *)arg); |
4a62a5ab JW |
601 | break; |
602 | case LIRC_GET_REC_MODE: | |
603 | if (!(ir->d.features & LIRC_CAN_REC_MASK)) { | |
604 | result = -ENOSYS; | |
605 | break; | |
606 | } | |
607 | ||
608 | result = put_user(LIRC_REC2MODE | |
609 | (ir->d.features & LIRC_CAN_REC_MASK), | |
60519af3 | 610 | (__u32 __user *)arg); |
4a62a5ab JW |
611 | break; |
612 | case LIRC_SET_REC_MODE: | |
613 | if (!(ir->d.features & LIRC_CAN_REC_MASK)) { | |
614 | result = -ENOSYS; | |
615 | break; | |
616 | } | |
617 | ||
60519af3 | 618 | result = get_user(mode, (__u32 __user *)arg); |
4a62a5ab JW |
619 | if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) |
620 | result = -EINVAL; | |
621 | /* | |
622 | * FIXME: We should actually set the mode somehow but | |
623 | * for now, lirc_serial doesn't support mode changing either | |
624 | */ | |
625 | break; | |
626 | case LIRC_GET_LENGTH: | |
60519af3 | 627 | result = put_user(ir->d.code_length, (__u32 __user *)arg); |
4a62a5ab JW |
628 | break; |
629 | case LIRC_GET_MIN_TIMEOUT: | |
630 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
631 | ir->d.min_timeout == 0) { | |
632 | result = -ENOSYS; | |
633 | break; | |
634 | } | |
635 | ||
60519af3 | 636 | result = put_user(ir->d.min_timeout, (__u32 __user *)arg); |
4a62a5ab JW |
637 | break; |
638 | case LIRC_GET_MAX_TIMEOUT: | |
639 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
640 | ir->d.max_timeout == 0) { | |
641 | result = -ENOSYS; | |
642 | break; | |
643 | } | |
644 | ||
60519af3 | 645 | result = put_user(ir->d.max_timeout, (__u32 __user *)arg); |
4a62a5ab JW |
646 | break; |
647 | default: | |
648 | result = -EINVAL; | |
649 | } | |
650 | ||
651 | dev_dbg(ir->d.dev, LOGHEAD "ioctl result = %d\n", | |
652 | ir->d.name, ir->d.minor, result); | |
653 | ||
654 | mutex_unlock(&ir->irctl_lock); | |
655 | ||
656 | return result; | |
657 | } | |
658 | EXPORT_SYMBOL(lirc_dev_fop_ioctl); | |
659 | ||
660 | ssize_t lirc_dev_fop_read(struct file *file, | |
0e835087 | 661 | char __user *buffer, |
4a62a5ab JW |
662 | size_t length, |
663 | loff_t *ppos) | |
664 | { | |
496ad9aa | 665 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
715d29a7 | 666 | unsigned char *buf; |
4a62a5ab JW |
667 | int ret = 0, written = 0; |
668 | DECLARE_WAITQUEUE(wait, current); | |
669 | ||
715d29a7 JW |
670 | if (!ir) { |
671 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
672 | return -ENODEV; | |
673 | } | |
674 | ||
4a62a5ab JW |
675 | dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); |
676 | ||
715d29a7 JW |
677 | buf = kzalloc(ir->chunk_size, GFP_KERNEL); |
678 | if (!buf) | |
679 | return -ENOMEM; | |
680 | ||
250f7a5f DC |
681 | if (mutex_lock_interruptible(&ir->irctl_lock)) { |
682 | ret = -ERESTARTSYS; | |
683 | goto out_unlocked; | |
684 | } | |
4a62a5ab | 685 | if (!ir->attached) { |
250f7a5f DC |
686 | ret = -ENODEV; |
687 | goto out_locked; | |
4a62a5ab JW |
688 | } |
689 | ||
690 | if (length % ir->chunk_size) { | |
250f7a5f DC |
691 | ret = -EINVAL; |
692 | goto out_locked; | |
4a62a5ab JW |
693 | } |
694 | ||
695 | /* | |
696 | * we add ourselves to the task queue before buffer check | |
697 | * to avoid losing scan code (in case when queue is awaken somewhere | |
698 | * between while condition checking and scheduling) | |
699 | */ | |
700 | add_wait_queue(&ir->buf->wait_poll, &wait); | |
701 | set_current_state(TASK_INTERRUPTIBLE); | |
702 | ||
703 | /* | |
704 | * while we didn't provide 'length' bytes, device is opened in blocking | |
705 | * mode and 'copy_to_user' is happy, wait for data. | |
706 | */ | |
707 | while (written < length && ret == 0) { | |
708 | if (lirc_buffer_empty(ir->buf)) { | |
709 | /* According to the read(2) man page, 'written' can be | |
710 | * returned as less than 'length', instead of blocking | |
711 | * again, returning -EWOULDBLOCK, or returning | |
712 | * -ERESTARTSYS */ | |
713 | if (written) | |
714 | break; | |
715 | if (file->f_flags & O_NONBLOCK) { | |
716 | ret = -EWOULDBLOCK; | |
717 | break; | |
718 | } | |
719 | if (signal_pending(current)) { | |
720 | ret = -ERESTARTSYS; | |
721 | break; | |
722 | } | |
723 | ||
724 | mutex_unlock(&ir->irctl_lock); | |
725 | schedule(); | |
726 | set_current_state(TASK_INTERRUPTIBLE); | |
727 | ||
728 | if (mutex_lock_interruptible(&ir->irctl_lock)) { | |
729 | ret = -ERESTARTSYS; | |
69c271f3 JW |
730 | remove_wait_queue(&ir->buf->wait_poll, &wait); |
731 | set_current_state(TASK_RUNNING); | |
732 | goto out_unlocked; | |
4a62a5ab JW |
733 | } |
734 | ||
735 | if (!ir->attached) { | |
736 | ret = -ENODEV; | |
737 | break; | |
738 | } | |
739 | } else { | |
740 | lirc_buffer_read(ir->buf, buf); | |
60519af3 | 741 | ret = copy_to_user((void __user *)buffer+written, buf, |
4a62a5ab | 742 | ir->buf->chunk_size); |
250f7a5f DC |
743 | if (!ret) |
744 | written += ir->buf->chunk_size; | |
745 | else | |
746 | ret = -EFAULT; | |
4a62a5ab JW |
747 | } |
748 | } | |
749 | ||
750 | remove_wait_queue(&ir->buf->wait_poll, &wait); | |
751 | set_current_state(TASK_RUNNING); | |
250f7a5f DC |
752 | |
753 | out_locked: | |
4a62a5ab JW |
754 | mutex_unlock(&ir->irctl_lock); |
755 | ||
69c271f3 | 756 | out_unlocked: |
715d29a7 | 757 | kfree(buf); |
4a62a5ab | 758 | dev_dbg(ir->d.dev, LOGHEAD "read result = %s (%d)\n", |
250f7a5f | 759 | ir->d.name, ir->d.minor, ret ? "<fail>" : "<ok>", ret); |
4a62a5ab JW |
760 | |
761 | return ret ? ret : written; | |
762 | } | |
763 | EXPORT_SYMBOL(lirc_dev_fop_read); | |
764 | ||
765 | void *lirc_get_pdata(struct file *file) | |
766 | { | |
0990a97a | 767 | return irctls[iminor(file_inode(file))]->d.data; |
4a62a5ab JW |
768 | } |
769 | EXPORT_SYMBOL(lirc_get_pdata); | |
770 | ||
771 | ||
0e835087 | 772 | ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer, |
4a62a5ab JW |
773 | size_t length, loff_t *ppos) |
774 | { | |
496ad9aa | 775 | struct irctl *ir = irctls[iminor(file_inode(file))]; |
4a62a5ab | 776 | |
715d29a7 JW |
777 | if (!ir) { |
778 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
779 | return -ENODEV; | |
780 | } | |
781 | ||
4a62a5ab JW |
782 | dev_dbg(ir->d.dev, LOGHEAD "write called\n", ir->d.name, ir->d.minor); |
783 | ||
784 | if (!ir->attached) | |
785 | return -ENODEV; | |
786 | ||
787 | return -EINVAL; | |
788 | } | |
789 | EXPORT_SYMBOL(lirc_dev_fop_write); | |
790 | ||
791 | ||
792 | static int __init lirc_dev_init(void) | |
793 | { | |
794 | int retval; | |
795 | ||
796 | lirc_class = class_create(THIS_MODULE, "lirc"); | |
797 | if (IS_ERR(lirc_class)) { | |
798 | retval = PTR_ERR(lirc_class); | |
799 | printk(KERN_ERR "lirc_dev: class_create failed\n"); | |
800 | goto error; | |
801 | } | |
802 | ||
803 | retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, | |
804 | IRCTL_DEV_NAME); | |
805 | if (retval) { | |
806 | class_destroy(lirc_class); | |
807 | printk(KERN_ERR "lirc_dev: alloc_chrdev_region failed\n"); | |
808 | goto error; | |
809 | } | |
810 | ||
811 | ||
812 | printk(KERN_INFO "lirc_dev: IR Remote Control driver registered, " | |
813 | "major %d \n", MAJOR(lirc_base_dev)); | |
814 | ||
815 | error: | |
816 | return retval; | |
817 | } | |
818 | ||
819 | ||
820 | ||
821 | static void __exit lirc_dev_exit(void) | |
822 | { | |
823 | class_destroy(lirc_class); | |
824 | unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); | |
825 | printk(KERN_INFO "lirc_dev: module unloaded\n"); | |
826 | } | |
827 | ||
828 | module_init(lirc_dev_init); | |
829 | module_exit(lirc_dev_exit); | |
830 | ||
831 | MODULE_DESCRIPTION("LIRC base driver module"); | |
832 | MODULE_AUTHOR("Artur Lipowski"); | |
833 | MODULE_LICENSE("GPL"); | |
834 | ||
835 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
836 | MODULE_PARM_DESC(debug, "Enable debugging messages"); |