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 | ||
38 | #include <media/lirc.h> | |
5690085e | 39 | #include <media/lirc_dev.h> |
4a62a5ab JW |
40 | |
41 | static int debug; | |
42 | ||
43 | #define IRCTL_DEV_NAME "BaseRemoteCtl" | |
44 | #define NOPLUG -1 | |
45 | #define LOGHEAD "lirc_dev (%s[%d]): " | |
46 | ||
47 | static dev_t lirc_base_dev; | |
48 | ||
49 | struct irctl { | |
50 | struct lirc_driver d; | |
51 | int attached; | |
52 | int open; | |
53 | ||
54 | struct mutex irctl_lock; | |
55 | struct lirc_buffer *buf; | |
56 | unsigned int chunk_size; | |
57 | ||
58 | struct task_struct *task; | |
59 | long jiffies_to_wait; | |
4a62a5ab JW |
60 | }; |
61 | ||
62 | static DEFINE_MUTEX(lirc_dev_lock); | |
63 | ||
64 | static struct irctl *irctls[MAX_IRCTL_DEVICES]; | |
c1cbb702 | 65 | static struct cdev cdevs[MAX_IRCTL_DEVICES]; |
4a62a5ab JW |
66 | |
67 | /* Only used for sysfs but defined to void otherwise */ | |
68 | static struct class *lirc_class; | |
69 | ||
70 | /* helper function | |
71 | * initializes the irctl structure | |
72 | */ | |
578fcb8e | 73 | static void lirc_irctl_init(struct irctl *ir) |
4a62a5ab | 74 | { |
4a62a5ab JW |
75 | mutex_init(&ir->irctl_lock); |
76 | ir->d.minor = NOPLUG; | |
77 | } | |
78 | ||
578fcb8e | 79 | static void lirc_irctl_cleanup(struct irctl *ir) |
4a62a5ab JW |
80 | { |
81 | dev_dbg(ir->d.dev, LOGHEAD "cleaning up\n", ir->d.name, ir->d.minor); | |
82 | ||
83 | device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); | |
84 | ||
85 | if (ir->buf != ir->d.rbuf) { | |
86 | lirc_buffer_free(ir->buf); | |
87 | kfree(ir->buf); | |
88 | } | |
89 | ir->buf = NULL; | |
90 | } | |
91 | ||
92 | /* helper function | |
93 | * reads key codes from driver and puts them into buffer | |
94 | * returns 0 on success | |
95 | */ | |
578fcb8e | 96 | static int lirc_add_to_buf(struct irctl *ir) |
4a62a5ab JW |
97 | { |
98 | if (ir->d.add_to_buf) { | |
99 | int res = -ENODATA; | |
100 | int got_data = 0; | |
101 | ||
102 | /* | |
103 | * service the device as long as it is returning | |
104 | * data and we have space | |
105 | */ | |
106 | get_data: | |
107 | res = ir->d.add_to_buf(ir->d.data, ir->buf); | |
108 | if (res == 0) { | |
109 | got_data++; | |
110 | goto get_data; | |
111 | } | |
112 | ||
113 | if (res == -ENODEV) | |
114 | kthread_stop(ir->task); | |
115 | ||
116 | return got_data ? 0 : res; | |
117 | } | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | /* main function of the polling thread | |
123 | */ | |
124 | static int lirc_thread(void *irctl) | |
125 | { | |
126 | struct irctl *ir = irctl; | |
127 | ||
128 | dev_dbg(ir->d.dev, LOGHEAD "poll thread started\n", | |
129 | ir->d.name, ir->d.minor); | |
130 | ||
131 | do { | |
132 | if (ir->open) { | |
133 | if (ir->jiffies_to_wait) { | |
134 | set_current_state(TASK_INTERRUPTIBLE); | |
135 | schedule_timeout(ir->jiffies_to_wait); | |
136 | } | |
137 | if (kthread_should_stop()) | |
138 | break; | |
578fcb8e | 139 | if (!lirc_add_to_buf(ir)) |
4a62a5ab JW |
140 | wake_up_interruptible(&ir->buf->wait_poll); |
141 | } else { | |
142 | set_current_state(TASK_INTERRUPTIBLE); | |
143 | schedule(); | |
144 | } | |
145 | } while (!kthread_should_stop()); | |
146 | ||
147 | dev_dbg(ir->d.dev, LOGHEAD "poll thread ended\n", | |
148 | ir->d.name, ir->d.minor); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | ||
578fcb8e | 154 | static struct file_operations lirc_dev_fops = { |
4a62a5ab JW |
155 | .owner = THIS_MODULE, |
156 | .read = lirc_dev_fop_read, | |
157 | .write = lirc_dev_fop_write, | |
158 | .poll = lirc_dev_fop_poll, | |
044e5878 | 159 | .unlocked_ioctl = lirc_dev_fop_ioctl, |
8be292cc JW |
160 | #ifdef CONFIG_COMPAT |
161 | .compat_ioctl = lirc_dev_fop_ioctl, | |
162 | #endif | |
4a62a5ab JW |
163 | .open = lirc_dev_fop_open, |
164 | .release = lirc_dev_fop_close, | |
6038f373 | 165 | .llseek = noop_llseek, |
4a62a5ab JW |
166 | }; |
167 | ||
168 | static int lirc_cdev_add(struct irctl *ir) | |
169 | { | |
170 | int retval; | |
171 | struct lirc_driver *d = &ir->d; | |
c1cbb702 | 172 | struct cdev *cdev = &cdevs[d->minor]; |
4a62a5ab JW |
173 | |
174 | if (d->fops) { | |
c1cbb702 JW |
175 | cdev_init(cdev, d->fops); |
176 | cdev->owner = d->owner; | |
4a62a5ab | 177 | } else { |
c1cbb702 JW |
178 | cdev_init(cdev, &lirc_dev_fops); |
179 | cdev->owner = THIS_MODULE; | |
4a62a5ab | 180 | } |
b395cbac VK |
181 | retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor); |
182 | if (retval) | |
183 | return retval; | |
4a62a5ab | 184 | |
c1cbb702 | 185 | retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); |
4a62a5ab | 186 | if (retval) |
c1cbb702 | 187 | kobject_put(&cdev->kobj); |
4a62a5ab JW |
188 | |
189 | return retval; | |
190 | } | |
191 | ||
192 | int lirc_register_driver(struct lirc_driver *d) | |
193 | { | |
194 | struct irctl *ir; | |
195 | int minor; | |
196 | int bytes_in_key; | |
197 | unsigned int chunk_size; | |
198 | unsigned int buffer_size; | |
199 | int err; | |
200 | ||
201 | if (!d) { | |
202 | printk(KERN_ERR "lirc_dev: lirc_register_driver: " | |
203 | "driver pointer must be not NULL!\n"); | |
204 | err = -EBADRQC; | |
205 | goto out; | |
206 | } | |
207 | ||
715d29a7 JW |
208 | if (!d->dev) { |
209 | printk(KERN_ERR "%s: dev pointer not filled in!\n", __func__); | |
210 | err = -EINVAL; | |
211 | goto out; | |
212 | } | |
213 | ||
4a62a5ab JW |
214 | if (MAX_IRCTL_DEVICES <= d->minor) { |
215 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
216 | "\"minor\" must be between 0 and %d (%d)!\n", | |
217 | MAX_IRCTL_DEVICES-1, d->minor); | |
218 | err = -EBADRQC; | |
219 | goto out; | |
220 | } | |
221 | ||
222 | if (1 > d->code_length || (BUFLEN * 8) < d->code_length) { | |
223 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
224 | "code length in bits for minor (%d) " | |
225 | "must be less than %d!\n", | |
226 | d->minor, BUFLEN * 8); | |
227 | err = -EBADRQC; | |
228 | goto out; | |
229 | } | |
230 | ||
231 | dev_dbg(d->dev, "lirc_dev: lirc_register_driver: sample_rate: %d\n", | |
232 | d->sample_rate); | |
233 | if (d->sample_rate) { | |
234 | if (2 > d->sample_rate || HZ < d->sample_rate) { | |
235 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
236 | "sample_rate must be between 2 and %d!\n", HZ); | |
237 | err = -EBADRQC; | |
238 | goto out; | |
239 | } | |
240 | if (!d->add_to_buf) { | |
241 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
242 | "add_to_buf cannot be NULL when " | |
243 | "sample_rate is set\n"); | |
244 | err = -EBADRQC; | |
245 | goto out; | |
246 | } | |
247 | } else if (!(d->fops && d->fops->read) && !d->rbuf) { | |
248 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
249 | "fops->read and rbuf cannot all be NULL!\n"); | |
250 | err = -EBADRQC; | |
251 | goto out; | |
252 | } else if (!d->rbuf) { | |
253 | if (!(d->fops && d->fops->read && d->fops->poll && | |
044e5878 | 254 | d->fops->unlocked_ioctl)) { |
4a62a5ab | 255 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " |
044e5878 | 256 | "neither read, poll nor unlocked_ioctl can be NULL!\n"); |
4a62a5ab JW |
257 | err = -EBADRQC; |
258 | goto out; | |
259 | } | |
260 | } | |
261 | ||
262 | mutex_lock(&lirc_dev_lock); | |
263 | ||
264 | minor = d->minor; | |
265 | ||
266 | if (minor < 0) { | |
267 | /* find first free slot for driver */ | |
268 | for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) | |
269 | if (!irctls[minor]) | |
270 | break; | |
271 | if (MAX_IRCTL_DEVICES == minor) { | |
272 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
273 | "no free slots for drivers!\n"); | |
274 | err = -ENOMEM; | |
275 | goto out_lock; | |
276 | } | |
277 | } else if (irctls[minor]) { | |
278 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
279 | "minor (%d) just registered!\n", minor); | |
280 | err = -EBUSY; | |
281 | goto out_lock; | |
282 | } | |
283 | ||
284 | ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); | |
285 | if (!ir) { | |
286 | err = -ENOMEM; | |
287 | goto out_lock; | |
288 | } | |
578fcb8e | 289 | lirc_irctl_init(ir); |
4a62a5ab JW |
290 | irctls[minor] = ir; |
291 | d->minor = minor; | |
292 | ||
293 | if (d->sample_rate) { | |
294 | ir->jiffies_to_wait = HZ / d->sample_rate; | |
295 | } else { | |
296 | /* it means - wait for external event in task queue */ | |
297 | ir->jiffies_to_wait = 0; | |
298 | } | |
299 | ||
300 | /* some safety check 8-) */ | |
301 | d->name[sizeof(d->name)-1] = '\0'; | |
302 | ||
303 | bytes_in_key = BITS_TO_LONGS(d->code_length) + | |
304 | (d->code_length % 8 ? 1 : 0); | |
305 | buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; | |
306 | chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; | |
307 | ||
308 | if (d->rbuf) { | |
309 | ir->buf = d->rbuf; | |
310 | } else { | |
311 | ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
312 | if (!ir->buf) { | |
313 | err = -ENOMEM; | |
314 | goto out_lock; | |
315 | } | |
316 | err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); | |
317 | if (err) { | |
318 | kfree(ir->buf); | |
319 | goto out_lock; | |
320 | } | |
321 | } | |
322 | ir->chunk_size = ir->buf->chunk_size; | |
323 | ||
324 | if (d->features == 0) | |
325 | d->features = LIRC_CAN_REC_LIRCCODE; | |
326 | ||
327 | ir->d = *d; | |
4a62a5ab JW |
328 | |
329 | device_create(lirc_class, ir->d.dev, | |
330 | MKDEV(MAJOR(lirc_base_dev), ir->d.minor), NULL, | |
331 | "lirc%u", ir->d.minor); | |
332 | ||
333 | if (d->sample_rate) { | |
334 | /* try to fire up polling thread */ | |
335 | ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev"); | |
336 | if (IS_ERR(ir->task)) { | |
337 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
338 | "cannot run poll thread for minor = %d\n", | |
339 | d->minor); | |
340 | err = -ECHILD; | |
341 | goto out_sysfs; | |
342 | } | |
343 | } | |
344 | ||
345 | err = lirc_cdev_add(ir); | |
346 | if (err) | |
347 | goto out_sysfs; | |
348 | ||
349 | ir->attached = 1; | |
350 | mutex_unlock(&lirc_dev_lock); | |
351 | ||
352 | dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", | |
353 | ir->d.name, ir->d.minor); | |
354 | return minor; | |
355 | ||
356 | out_sysfs: | |
357 | device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); | |
358 | out_lock: | |
359 | mutex_unlock(&lirc_dev_lock); | |
360 | out: | |
361 | return err; | |
362 | } | |
363 | EXPORT_SYMBOL(lirc_register_driver); | |
364 | ||
365 | int lirc_unregister_driver(int minor) | |
366 | { | |
367 | struct irctl *ir; | |
c1cbb702 | 368 | struct cdev *cdev; |
4a62a5ab JW |
369 | |
370 | if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { | |
4fc21543 JW |
371 | printk(KERN_ERR "lirc_dev: %s: minor (%d) must be between " |
372 | "0 and %d!\n", __func__, minor, MAX_IRCTL_DEVICES-1); | |
4a62a5ab JW |
373 | return -EBADRQC; |
374 | } | |
375 | ||
376 | ir = irctls[minor]; | |
df1868e4 | 377 | if (!ir) { |
4fc21543 JW |
378 | printk(KERN_ERR "lirc_dev: %s: failed to get irctl struct " |
379 | "for minor %d!\n", __func__, minor); | |
df1868e4 JW |
380 | return -ENOENT; |
381 | } | |
4a62a5ab | 382 | |
c1cbb702 | 383 | cdev = &cdevs[minor]; |
4a62a5ab JW |
384 | |
385 | mutex_lock(&lirc_dev_lock); | |
386 | ||
387 | if (ir->d.minor != minor) { | |
4fc21543 JW |
388 | printk(KERN_ERR "lirc_dev: %s: minor (%d) device not " |
389 | "registered!\n", __func__, minor); | |
4a62a5ab JW |
390 | mutex_unlock(&lirc_dev_lock); |
391 | return -ENOENT; | |
392 | } | |
393 | ||
394 | /* end up polling thread */ | |
395 | if (ir->task) | |
396 | kthread_stop(ir->task); | |
397 | ||
398 | dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", | |
399 | ir->d.name, ir->d.minor); | |
400 | ||
401 | ir->attached = 0; | |
402 | if (ir->open) { | |
403 | dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", | |
404 | ir->d.name, ir->d.minor); | |
405 | wake_up_interruptible(&ir->buf->wait_poll); | |
406 | mutex_lock(&ir->irctl_lock); | |
407 | ir->d.set_use_dec(ir->d.data); | |
c1cbb702 | 408 | module_put(cdev->owner); |
4a62a5ab | 409 | mutex_unlock(&ir->irctl_lock); |
4a62a5ab | 410 | } else { |
578fcb8e | 411 | lirc_irctl_cleanup(ir); |
c1cbb702 | 412 | cdev_del(cdev); |
4a62a5ab JW |
413 | kfree(ir); |
414 | irctls[minor] = NULL; | |
415 | } | |
416 | ||
417 | mutex_unlock(&lirc_dev_lock); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | EXPORT_SYMBOL(lirc_unregister_driver); | |
422 | ||
423 | int lirc_dev_fop_open(struct inode *inode, struct file *file) | |
424 | { | |
425 | struct irctl *ir; | |
c1cbb702 | 426 | struct cdev *cdev; |
4a62a5ab JW |
427 | int retval = 0; |
428 | ||
429 | if (iminor(inode) >= MAX_IRCTL_DEVICES) { | |
430 | printk(KERN_WARNING "lirc_dev [%d]: open result = -ENODEV\n", | |
431 | iminor(inode)); | |
432 | return -ENODEV; | |
433 | } | |
434 | ||
435 | if (mutex_lock_interruptible(&lirc_dev_lock)) | |
436 | return -ERESTARTSYS; | |
437 | ||
438 | ir = irctls[iminor(inode)]; | |
439 | if (!ir) { | |
440 | retval = -ENODEV; | |
441 | goto error; | |
442 | } | |
443 | ||
444 | dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); | |
445 | ||
446 | if (ir->d.minor == NOPLUG) { | |
447 | retval = -ENODEV; | |
448 | goto error; | |
449 | } | |
450 | ||
451 | if (ir->open) { | |
452 | retval = -EBUSY; | |
453 | goto error; | |
454 | } | |
455 | ||
c1cbb702 JW |
456 | cdev = &cdevs[iminor(inode)]; |
457 | if (try_module_get(cdev->owner)) { | |
458 | ir->open++; | |
4a62a5ab JW |
459 | retval = ir->d.set_use_inc(ir->d.data); |
460 | ||
461 | if (retval) { | |
c1cbb702 JW |
462 | module_put(cdev->owner); |
463 | ir->open--; | |
4a62a5ab JW |
464 | } else { |
465 | lirc_buffer_clear(ir->buf); | |
466 | } | |
467 | if (ir->task) | |
468 | wake_up_process(ir->task); | |
469 | } | |
470 | ||
471 | error: | |
472 | if (ir) | |
473 | dev_dbg(ir->d.dev, LOGHEAD "open result = %d\n", | |
474 | ir->d.name, ir->d.minor, retval); | |
475 | ||
476 | mutex_unlock(&lirc_dev_lock); | |
477 | ||
d9d2e9d5 AB |
478 | nonseekable_open(inode, file); |
479 | ||
4a62a5ab JW |
480 | return retval; |
481 | } | |
482 | EXPORT_SYMBOL(lirc_dev_fop_open); | |
483 | ||
484 | int lirc_dev_fop_close(struct inode *inode, struct file *file) | |
485 | { | |
486 | struct irctl *ir = irctls[iminor(inode)]; | |
c1cbb702 | 487 | struct cdev *cdev = &cdevs[iminor(inode)]; |
4a62a5ab | 488 | |
715d29a7 JW |
489 | if (!ir) { |
490 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
491 | return -EINVAL; | |
492 | } | |
4a62a5ab JW |
493 | |
494 | dev_dbg(ir->d.dev, LOGHEAD "close called\n", ir->d.name, ir->d.minor); | |
495 | ||
496 | WARN_ON(mutex_lock_killable(&lirc_dev_lock)); | |
497 | ||
715d29a7 | 498 | ir->open--; |
4a62a5ab JW |
499 | if (ir->attached) { |
500 | ir->d.set_use_dec(ir->d.data); | |
c1cbb702 | 501 | module_put(cdev->owner); |
4a62a5ab | 502 | } else { |
578fcb8e | 503 | lirc_irctl_cleanup(ir); |
c1cbb702 | 504 | cdev_del(cdev); |
4a62a5ab JW |
505 | irctls[ir->d.minor] = NULL; |
506 | kfree(ir); | |
507 | } | |
508 | ||
509 | mutex_unlock(&lirc_dev_lock); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | EXPORT_SYMBOL(lirc_dev_fop_close); | |
514 | ||
515 | unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) | |
516 | { | |
517 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; | |
518 | unsigned int ret; | |
519 | ||
715d29a7 JW |
520 | if (!ir) { |
521 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
522 | return POLLERR; | |
523 | } | |
524 | ||
4a62a5ab JW |
525 | dev_dbg(ir->d.dev, LOGHEAD "poll called\n", ir->d.name, ir->d.minor); |
526 | ||
5c769a68 | 527 | if (!ir->attached) |
4a62a5ab | 528 | return POLLERR; |
4a62a5ab JW |
529 | |
530 | poll_wait(file, &ir->buf->wait_poll, wait); | |
531 | ||
532 | if (ir->buf) | |
533 | if (lirc_buffer_empty(ir->buf)) | |
534 | ret = 0; | |
535 | else | |
536 | ret = POLLIN | POLLRDNORM; | |
537 | else | |
538 | ret = POLLERR; | |
539 | ||
540 | dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", | |
541 | ir->d.name, ir->d.minor, ret); | |
542 | ||
543 | return ret; | |
544 | } | |
545 | EXPORT_SYMBOL(lirc_dev_fop_poll); | |
546 | ||
044e5878 | 547 | long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
4a62a5ab | 548 | { |
be1f985f | 549 | __u32 mode; |
4a62a5ab | 550 | int result = 0; |
d889a135 | 551 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; |
4a62a5ab | 552 | |
8be292cc JW |
553 | if (!ir) { |
554 | printk(KERN_ERR "lirc_dev: %s: no irctl found!\n", __func__); | |
555 | return -ENODEV; | |
556 | } | |
4a62a5ab JW |
557 | |
558 | dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", | |
559 | ir->d.name, ir->d.minor, cmd); | |
560 | ||
561 | if (ir->d.minor == NOPLUG || !ir->attached) { | |
562 | dev_dbg(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", | |
563 | ir->d.name, ir->d.minor); | |
564 | return -ENODEV; | |
565 | } | |
566 | ||
567 | mutex_lock(&ir->irctl_lock); | |
568 | ||
569 | switch (cmd) { | |
570 | case LIRC_GET_FEATURES: | |
be1f985f | 571 | result = put_user(ir->d.features, (__u32 *)arg); |
4a62a5ab JW |
572 | break; |
573 | case LIRC_GET_REC_MODE: | |
574 | if (!(ir->d.features & LIRC_CAN_REC_MASK)) { | |
575 | result = -ENOSYS; | |
576 | break; | |
577 | } | |
578 | ||
579 | result = put_user(LIRC_REC2MODE | |
580 | (ir->d.features & LIRC_CAN_REC_MASK), | |
be1f985f | 581 | (__u32 *)arg); |
4a62a5ab JW |
582 | break; |
583 | case LIRC_SET_REC_MODE: | |
584 | if (!(ir->d.features & LIRC_CAN_REC_MASK)) { | |
585 | result = -ENOSYS; | |
586 | break; | |
587 | } | |
588 | ||
be1f985f | 589 | result = get_user(mode, (__u32 *)arg); |
4a62a5ab JW |
590 | if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) |
591 | result = -EINVAL; | |
592 | /* | |
593 | * FIXME: We should actually set the mode somehow but | |
594 | * for now, lirc_serial doesn't support mode changing either | |
595 | */ | |
596 | break; | |
597 | case LIRC_GET_LENGTH: | |
be1f985f | 598 | result = put_user(ir->d.code_length, (__u32 *)arg); |
4a62a5ab JW |
599 | break; |
600 | case LIRC_GET_MIN_TIMEOUT: | |
601 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
602 | ir->d.min_timeout == 0) { | |
603 | result = -ENOSYS; | |
604 | break; | |
605 | } | |
606 | ||
be1f985f | 607 | result = put_user(ir->d.min_timeout, (__u32 *)arg); |
4a62a5ab JW |
608 | break; |
609 | case LIRC_GET_MAX_TIMEOUT: | |
610 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
611 | ir->d.max_timeout == 0) { | |
612 | result = -ENOSYS; | |
613 | break; | |
614 | } | |
615 | ||
be1f985f | 616 | result = put_user(ir->d.max_timeout, (__u32 *)arg); |
4a62a5ab JW |
617 | break; |
618 | default: | |
619 | result = -EINVAL; | |
620 | } | |
621 | ||
622 | dev_dbg(ir->d.dev, LOGHEAD "ioctl result = %d\n", | |
623 | ir->d.name, ir->d.minor, result); | |
624 | ||
625 | mutex_unlock(&ir->irctl_lock); | |
626 | ||
627 | return result; | |
628 | } | |
629 | EXPORT_SYMBOL(lirc_dev_fop_ioctl); | |
630 | ||
631 | ssize_t lirc_dev_fop_read(struct file *file, | |
0e835087 | 632 | char __user *buffer, |
4a62a5ab JW |
633 | size_t length, |
634 | loff_t *ppos) | |
635 | { | |
636 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; | |
715d29a7 | 637 | unsigned char *buf; |
4a62a5ab JW |
638 | int ret = 0, written = 0; |
639 | DECLARE_WAITQUEUE(wait, current); | |
640 | ||
715d29a7 JW |
641 | if (!ir) { |
642 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
643 | return -ENODEV; | |
644 | } | |
645 | ||
4a62a5ab JW |
646 | dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); |
647 | ||
715d29a7 JW |
648 | buf = kzalloc(ir->chunk_size, GFP_KERNEL); |
649 | if (!buf) | |
650 | return -ENOMEM; | |
651 | ||
250f7a5f DC |
652 | if (mutex_lock_interruptible(&ir->irctl_lock)) { |
653 | ret = -ERESTARTSYS; | |
654 | goto out_unlocked; | |
655 | } | |
4a62a5ab | 656 | if (!ir->attached) { |
250f7a5f DC |
657 | ret = -ENODEV; |
658 | goto out_locked; | |
4a62a5ab JW |
659 | } |
660 | ||
661 | if (length % ir->chunk_size) { | |
250f7a5f DC |
662 | ret = -EINVAL; |
663 | goto out_locked; | |
4a62a5ab JW |
664 | } |
665 | ||
666 | /* | |
667 | * we add ourselves to the task queue before buffer check | |
668 | * to avoid losing scan code (in case when queue is awaken somewhere | |
669 | * between while condition checking and scheduling) | |
670 | */ | |
671 | add_wait_queue(&ir->buf->wait_poll, &wait); | |
672 | set_current_state(TASK_INTERRUPTIBLE); | |
673 | ||
674 | /* | |
675 | * while we didn't provide 'length' bytes, device is opened in blocking | |
676 | * mode and 'copy_to_user' is happy, wait for data. | |
677 | */ | |
678 | while (written < length && ret == 0) { | |
679 | if (lirc_buffer_empty(ir->buf)) { | |
680 | /* According to the read(2) man page, 'written' can be | |
681 | * returned as less than 'length', instead of blocking | |
682 | * again, returning -EWOULDBLOCK, or returning | |
683 | * -ERESTARTSYS */ | |
684 | if (written) | |
685 | break; | |
686 | if (file->f_flags & O_NONBLOCK) { | |
687 | ret = -EWOULDBLOCK; | |
688 | break; | |
689 | } | |
690 | if (signal_pending(current)) { | |
691 | ret = -ERESTARTSYS; | |
692 | break; | |
693 | } | |
694 | ||
695 | mutex_unlock(&ir->irctl_lock); | |
696 | schedule(); | |
697 | set_current_state(TASK_INTERRUPTIBLE); | |
698 | ||
699 | if (mutex_lock_interruptible(&ir->irctl_lock)) { | |
700 | ret = -ERESTARTSYS; | |
69c271f3 JW |
701 | remove_wait_queue(&ir->buf->wait_poll, &wait); |
702 | set_current_state(TASK_RUNNING); | |
703 | goto out_unlocked; | |
4a62a5ab JW |
704 | } |
705 | ||
706 | if (!ir->attached) { | |
707 | ret = -ENODEV; | |
708 | break; | |
709 | } | |
710 | } else { | |
711 | lirc_buffer_read(ir->buf, buf); | |
712 | ret = copy_to_user((void *)buffer+written, buf, | |
713 | ir->buf->chunk_size); | |
250f7a5f DC |
714 | if (!ret) |
715 | written += ir->buf->chunk_size; | |
716 | else | |
717 | ret = -EFAULT; | |
4a62a5ab JW |
718 | } |
719 | } | |
720 | ||
721 | remove_wait_queue(&ir->buf->wait_poll, &wait); | |
722 | set_current_state(TASK_RUNNING); | |
250f7a5f DC |
723 | |
724 | out_locked: | |
4a62a5ab JW |
725 | mutex_unlock(&ir->irctl_lock); |
726 | ||
69c271f3 | 727 | out_unlocked: |
715d29a7 | 728 | kfree(buf); |
4a62a5ab | 729 | dev_dbg(ir->d.dev, LOGHEAD "read result = %s (%d)\n", |
250f7a5f | 730 | ir->d.name, ir->d.minor, ret ? "<fail>" : "<ok>", ret); |
4a62a5ab JW |
731 | |
732 | return ret ? ret : written; | |
733 | } | |
734 | EXPORT_SYMBOL(lirc_dev_fop_read); | |
735 | ||
736 | void *lirc_get_pdata(struct file *file) | |
737 | { | |
738 | void *data = NULL; | |
739 | ||
740 | if (file && file->f_dentry && file->f_dentry->d_inode && | |
741 | file->f_dentry->d_inode->i_rdev) { | |
742 | struct irctl *ir; | |
743 | ir = irctls[iminor(file->f_dentry->d_inode)]; | |
744 | data = ir->d.data; | |
745 | } | |
746 | ||
747 | return data; | |
748 | } | |
749 | EXPORT_SYMBOL(lirc_get_pdata); | |
750 | ||
751 | ||
0e835087 | 752 | ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer, |
4a62a5ab JW |
753 | size_t length, loff_t *ppos) |
754 | { | |
755 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; | |
756 | ||
715d29a7 JW |
757 | if (!ir) { |
758 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
759 | return -ENODEV; | |
760 | } | |
761 | ||
4a62a5ab JW |
762 | dev_dbg(ir->d.dev, LOGHEAD "write called\n", ir->d.name, ir->d.minor); |
763 | ||
764 | if (!ir->attached) | |
765 | return -ENODEV; | |
766 | ||
767 | return -EINVAL; | |
768 | } | |
769 | EXPORT_SYMBOL(lirc_dev_fop_write); | |
770 | ||
771 | ||
772 | static int __init lirc_dev_init(void) | |
773 | { | |
774 | int retval; | |
775 | ||
776 | lirc_class = class_create(THIS_MODULE, "lirc"); | |
777 | if (IS_ERR(lirc_class)) { | |
778 | retval = PTR_ERR(lirc_class); | |
779 | printk(KERN_ERR "lirc_dev: class_create failed\n"); | |
780 | goto error; | |
781 | } | |
782 | ||
783 | retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, | |
784 | IRCTL_DEV_NAME); | |
785 | if (retval) { | |
786 | class_destroy(lirc_class); | |
787 | printk(KERN_ERR "lirc_dev: alloc_chrdev_region failed\n"); | |
788 | goto error; | |
789 | } | |
790 | ||
791 | ||
792 | printk(KERN_INFO "lirc_dev: IR Remote Control driver registered, " | |
793 | "major %d \n", MAJOR(lirc_base_dev)); | |
794 | ||
795 | error: | |
796 | return retval; | |
797 | } | |
798 | ||
799 | ||
800 | ||
801 | static void __exit lirc_dev_exit(void) | |
802 | { | |
803 | class_destroy(lirc_class); | |
804 | unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); | |
805 | printk(KERN_INFO "lirc_dev: module unloaded\n"); | |
806 | } | |
807 | ||
808 | module_init(lirc_dev_init); | |
809 | module_exit(lirc_dev_exit); | |
810 | ||
811 | MODULE_DESCRIPTION("LIRC base driver module"); | |
812 | MODULE_AUTHOR("Artur Lipowski"); | |
813 | MODULE_LICENSE("GPL"); | |
814 | ||
815 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
816 | MODULE_PARM_DESC(debug, "Enable debugging messages"); |