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 | ||
8de111e2 JW |
58 | struct cdev *cdev; |
59 | ||
4a62a5ab JW |
60 | struct task_struct *task; |
61 | long jiffies_to_wait; | |
4a62a5ab JW |
62 | }; |
63 | ||
64 | static DEFINE_MUTEX(lirc_dev_lock); | |
65 | ||
66 | static struct irctl *irctls[MAX_IRCTL_DEVICES]; | |
67 | ||
68 | /* Only used for sysfs but defined to void otherwise */ | |
69 | static struct class *lirc_class; | |
70 | ||
71 | /* helper function | |
72 | * initializes the irctl structure | |
73 | */ | |
578fcb8e | 74 | static void lirc_irctl_init(struct irctl *ir) |
4a62a5ab | 75 | { |
4a62a5ab JW |
76 | mutex_init(&ir->irctl_lock); |
77 | ir->d.minor = NOPLUG; | |
78 | } | |
79 | ||
578fcb8e | 80 | static void lirc_irctl_cleanup(struct irctl *ir) |
4a62a5ab JW |
81 | { |
82 | dev_dbg(ir->d.dev, LOGHEAD "cleaning up\n", ir->d.name, ir->d.minor); | |
83 | ||
84 | device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); | |
85 | ||
86 | if (ir->buf != ir->d.rbuf) { | |
87 | lirc_buffer_free(ir->buf); | |
88 | kfree(ir->buf); | |
89 | } | |
90 | ir->buf = NULL; | |
91 | } | |
92 | ||
93 | /* helper function | |
94 | * reads key codes from driver and puts them into buffer | |
95 | * returns 0 on success | |
96 | */ | |
578fcb8e | 97 | static int lirc_add_to_buf(struct irctl *ir) |
4a62a5ab JW |
98 | { |
99 | if (ir->d.add_to_buf) { | |
100 | int res = -ENODATA; | |
101 | int got_data = 0; | |
102 | ||
103 | /* | |
104 | * service the device as long as it is returning | |
105 | * data and we have space | |
106 | */ | |
107 | get_data: | |
108 | res = ir->d.add_to_buf(ir->d.data, ir->buf); | |
109 | if (res == 0) { | |
110 | got_data++; | |
111 | goto get_data; | |
112 | } | |
113 | ||
114 | if (res == -ENODEV) | |
115 | kthread_stop(ir->task); | |
116 | ||
117 | return got_data ? 0 : res; | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | /* main function of the polling thread | |
124 | */ | |
125 | static int lirc_thread(void *irctl) | |
126 | { | |
127 | struct irctl *ir = irctl; | |
128 | ||
129 | dev_dbg(ir->d.dev, LOGHEAD "poll thread started\n", | |
130 | ir->d.name, ir->d.minor); | |
131 | ||
132 | do { | |
133 | if (ir->open) { | |
134 | if (ir->jiffies_to_wait) { | |
135 | set_current_state(TASK_INTERRUPTIBLE); | |
136 | schedule_timeout(ir->jiffies_to_wait); | |
137 | } | |
138 | if (kthread_should_stop()) | |
139 | break; | |
578fcb8e | 140 | if (!lirc_add_to_buf(ir)) |
4a62a5ab JW |
141 | wake_up_interruptible(&ir->buf->wait_poll); |
142 | } else { | |
143 | set_current_state(TASK_INTERRUPTIBLE); | |
144 | schedule(); | |
145 | } | |
146 | } while (!kthread_should_stop()); | |
147 | ||
148 | dev_dbg(ir->d.dev, LOGHEAD "poll thread ended\n", | |
149 | ir->d.name, ir->d.minor); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | ||
578fcb8e | 155 | static struct file_operations lirc_dev_fops = { |
4a62a5ab JW |
156 | .owner = THIS_MODULE, |
157 | .read = lirc_dev_fop_read, | |
158 | .write = lirc_dev_fop_write, | |
159 | .poll = lirc_dev_fop_poll, | |
044e5878 | 160 | .unlocked_ioctl = lirc_dev_fop_ioctl, |
8be292cc JW |
161 | #ifdef CONFIG_COMPAT |
162 | .compat_ioctl = lirc_dev_fop_ioctl, | |
163 | #endif | |
4a62a5ab JW |
164 | .open = lirc_dev_fop_open, |
165 | .release = lirc_dev_fop_close, | |
6038f373 | 166 | .llseek = noop_llseek, |
4a62a5ab JW |
167 | }; |
168 | ||
169 | static int lirc_cdev_add(struct irctl *ir) | |
170 | { | |
8de111e2 | 171 | int retval = -ENOMEM; |
4a62a5ab | 172 | struct lirc_driver *d = &ir->d; |
8de111e2 JW |
173 | struct cdev *cdev; |
174 | ||
175 | cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); | |
176 | if (!cdev) | |
177 | goto err_out; | |
4a62a5ab JW |
178 | |
179 | if (d->fops) { | |
c1cbb702 JW |
180 | cdev_init(cdev, d->fops); |
181 | cdev->owner = d->owner; | |
4a62a5ab | 182 | } else { |
c1cbb702 JW |
183 | cdev_init(cdev, &lirc_dev_fops); |
184 | cdev->owner = THIS_MODULE; | |
4a62a5ab | 185 | } |
b395cbac VK |
186 | retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor); |
187 | if (retval) | |
8de111e2 | 188 | goto err_out; |
4a62a5ab | 189 | |
c1cbb702 | 190 | retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); |
8de111e2 | 191 | if (retval) { |
c1cbb702 | 192 | kobject_put(&cdev->kobj); |
8de111e2 JW |
193 | goto err_out; |
194 | } | |
4a62a5ab | 195 | |
8de111e2 JW |
196 | ir->cdev = cdev; |
197 | ||
198 | return 0; | |
199 | ||
200 | err_out: | |
201 | kfree(cdev); | |
4a62a5ab JW |
202 | return retval; |
203 | } | |
204 | ||
205 | int lirc_register_driver(struct lirc_driver *d) | |
206 | { | |
207 | struct irctl *ir; | |
208 | int minor; | |
209 | int bytes_in_key; | |
210 | unsigned int chunk_size; | |
211 | unsigned int buffer_size; | |
212 | int err; | |
213 | ||
214 | if (!d) { | |
215 | printk(KERN_ERR "lirc_dev: lirc_register_driver: " | |
216 | "driver pointer must be not NULL!\n"); | |
217 | err = -EBADRQC; | |
218 | goto out; | |
219 | } | |
220 | ||
715d29a7 JW |
221 | if (!d->dev) { |
222 | printk(KERN_ERR "%s: dev pointer not filled in!\n", __func__); | |
223 | err = -EINVAL; | |
224 | goto out; | |
225 | } | |
226 | ||
4a62a5ab JW |
227 | if (MAX_IRCTL_DEVICES <= d->minor) { |
228 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
229 | "\"minor\" must be between 0 and %d (%d)!\n", | |
8de111e2 | 230 | MAX_IRCTL_DEVICES - 1, d->minor); |
4a62a5ab JW |
231 | err = -EBADRQC; |
232 | goto out; | |
233 | } | |
234 | ||
235 | if (1 > d->code_length || (BUFLEN * 8) < d->code_length) { | |
236 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
237 | "code length in bits for minor (%d) " | |
238 | "must be less than %d!\n", | |
239 | d->minor, BUFLEN * 8); | |
240 | err = -EBADRQC; | |
241 | goto out; | |
242 | } | |
243 | ||
244 | dev_dbg(d->dev, "lirc_dev: lirc_register_driver: sample_rate: %d\n", | |
245 | d->sample_rate); | |
246 | if (d->sample_rate) { | |
247 | if (2 > d->sample_rate || HZ < d->sample_rate) { | |
248 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
249 | "sample_rate must be between 2 and %d!\n", HZ); | |
250 | err = -EBADRQC; | |
251 | goto out; | |
252 | } | |
253 | if (!d->add_to_buf) { | |
254 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
255 | "add_to_buf cannot be NULL when " | |
256 | "sample_rate is set\n"); | |
257 | err = -EBADRQC; | |
258 | goto out; | |
259 | } | |
260 | } else if (!(d->fops && d->fops->read) && !d->rbuf) { | |
261 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
262 | "fops->read and rbuf cannot all be NULL!\n"); | |
263 | err = -EBADRQC; | |
264 | goto out; | |
265 | } else if (!d->rbuf) { | |
266 | if (!(d->fops && d->fops->read && d->fops->poll && | |
044e5878 | 267 | d->fops->unlocked_ioctl)) { |
4a62a5ab | 268 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " |
044e5878 | 269 | "neither read, poll nor unlocked_ioctl can be NULL!\n"); |
4a62a5ab JW |
270 | err = -EBADRQC; |
271 | goto out; | |
272 | } | |
273 | } | |
274 | ||
275 | mutex_lock(&lirc_dev_lock); | |
276 | ||
277 | minor = d->minor; | |
278 | ||
279 | if (minor < 0) { | |
280 | /* find first free slot for driver */ | |
281 | for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) | |
282 | if (!irctls[minor]) | |
283 | break; | |
284 | if (MAX_IRCTL_DEVICES == minor) { | |
285 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
286 | "no free slots for drivers!\n"); | |
287 | err = -ENOMEM; | |
288 | goto out_lock; | |
289 | } | |
290 | } else if (irctls[minor]) { | |
291 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
292 | "minor (%d) just registered!\n", minor); | |
293 | err = -EBUSY; | |
294 | goto out_lock; | |
295 | } | |
296 | ||
297 | ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); | |
298 | if (!ir) { | |
299 | err = -ENOMEM; | |
300 | goto out_lock; | |
301 | } | |
578fcb8e | 302 | lirc_irctl_init(ir); |
4a62a5ab JW |
303 | irctls[minor] = ir; |
304 | d->minor = minor; | |
305 | ||
306 | if (d->sample_rate) { | |
307 | ir->jiffies_to_wait = HZ / d->sample_rate; | |
308 | } else { | |
309 | /* it means - wait for external event in task queue */ | |
310 | ir->jiffies_to_wait = 0; | |
311 | } | |
312 | ||
313 | /* some safety check 8-) */ | |
314 | d->name[sizeof(d->name)-1] = '\0'; | |
315 | ||
316 | bytes_in_key = BITS_TO_LONGS(d->code_length) + | |
317 | (d->code_length % 8 ? 1 : 0); | |
318 | buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; | |
319 | chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; | |
320 | ||
321 | if (d->rbuf) { | |
322 | ir->buf = d->rbuf; | |
323 | } else { | |
324 | ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); | |
325 | if (!ir->buf) { | |
326 | err = -ENOMEM; | |
327 | goto out_lock; | |
328 | } | |
329 | err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); | |
330 | if (err) { | |
331 | kfree(ir->buf); | |
332 | goto out_lock; | |
333 | } | |
334 | } | |
335 | ir->chunk_size = ir->buf->chunk_size; | |
336 | ||
337 | if (d->features == 0) | |
338 | d->features = LIRC_CAN_REC_LIRCCODE; | |
339 | ||
340 | ir->d = *d; | |
4a62a5ab JW |
341 | |
342 | device_create(lirc_class, ir->d.dev, | |
343 | MKDEV(MAJOR(lirc_base_dev), ir->d.minor), NULL, | |
344 | "lirc%u", ir->d.minor); | |
345 | ||
346 | if (d->sample_rate) { | |
347 | /* try to fire up polling thread */ | |
348 | ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev"); | |
349 | if (IS_ERR(ir->task)) { | |
350 | dev_err(d->dev, "lirc_dev: lirc_register_driver: " | |
351 | "cannot run poll thread for minor = %d\n", | |
352 | d->minor); | |
353 | err = -ECHILD; | |
354 | goto out_sysfs; | |
355 | } | |
356 | } | |
357 | ||
358 | err = lirc_cdev_add(ir); | |
359 | if (err) | |
360 | goto out_sysfs; | |
361 | ||
362 | ir->attached = 1; | |
363 | mutex_unlock(&lirc_dev_lock); | |
364 | ||
365 | dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", | |
366 | ir->d.name, ir->d.minor); | |
367 | return minor; | |
368 | ||
369 | out_sysfs: | |
370 | device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); | |
371 | out_lock: | |
372 | mutex_unlock(&lirc_dev_lock); | |
373 | out: | |
374 | return err; | |
375 | } | |
376 | EXPORT_SYMBOL(lirc_register_driver); | |
377 | ||
378 | int lirc_unregister_driver(int minor) | |
379 | { | |
380 | struct irctl *ir; | |
c1cbb702 | 381 | struct cdev *cdev; |
4a62a5ab JW |
382 | |
383 | if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { | |
4fc21543 | 384 | printk(KERN_ERR "lirc_dev: %s: minor (%d) must be between " |
8de111e2 | 385 | "0 and %d!\n", __func__, minor, MAX_IRCTL_DEVICES - 1); |
4a62a5ab JW |
386 | return -EBADRQC; |
387 | } | |
388 | ||
389 | ir = irctls[minor]; | |
df1868e4 | 390 | if (!ir) { |
4fc21543 JW |
391 | printk(KERN_ERR "lirc_dev: %s: failed to get irctl struct " |
392 | "for minor %d!\n", __func__, minor); | |
df1868e4 JW |
393 | return -ENOENT; |
394 | } | |
4a62a5ab | 395 | |
8de111e2 | 396 | cdev = ir->cdev; |
4a62a5ab JW |
397 | |
398 | mutex_lock(&lirc_dev_lock); | |
399 | ||
400 | if (ir->d.minor != minor) { | |
4fc21543 JW |
401 | printk(KERN_ERR "lirc_dev: %s: minor (%d) device not " |
402 | "registered!\n", __func__, minor); | |
4a62a5ab JW |
403 | mutex_unlock(&lirc_dev_lock); |
404 | return -ENOENT; | |
405 | } | |
406 | ||
407 | /* end up polling thread */ | |
408 | if (ir->task) | |
409 | kthread_stop(ir->task); | |
410 | ||
411 | dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", | |
412 | ir->d.name, ir->d.minor); | |
413 | ||
414 | ir->attached = 0; | |
415 | if (ir->open) { | |
416 | dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", | |
417 | ir->d.name, ir->d.minor); | |
418 | wake_up_interruptible(&ir->buf->wait_poll); | |
419 | mutex_lock(&ir->irctl_lock); | |
420 | ir->d.set_use_dec(ir->d.data); | |
c1cbb702 | 421 | module_put(cdev->owner); |
4a62a5ab | 422 | mutex_unlock(&ir->irctl_lock); |
4a62a5ab | 423 | } else { |
578fcb8e | 424 | lirc_irctl_cleanup(ir); |
c1cbb702 | 425 | cdev_del(cdev); |
8de111e2 | 426 | kfree(cdev); |
4a62a5ab JW |
427 | kfree(ir); |
428 | irctls[minor] = NULL; | |
429 | } | |
430 | ||
431 | mutex_unlock(&lirc_dev_lock); | |
432 | ||
433 | return 0; | |
434 | } | |
435 | EXPORT_SYMBOL(lirc_unregister_driver); | |
436 | ||
437 | int lirc_dev_fop_open(struct inode *inode, struct file *file) | |
438 | { | |
439 | struct irctl *ir; | |
c1cbb702 | 440 | struct cdev *cdev; |
4a62a5ab JW |
441 | int retval = 0; |
442 | ||
443 | if (iminor(inode) >= MAX_IRCTL_DEVICES) { | |
444 | printk(KERN_WARNING "lirc_dev [%d]: open result = -ENODEV\n", | |
445 | iminor(inode)); | |
446 | return -ENODEV; | |
447 | } | |
448 | ||
449 | if (mutex_lock_interruptible(&lirc_dev_lock)) | |
450 | return -ERESTARTSYS; | |
451 | ||
452 | ir = irctls[iminor(inode)]; | |
453 | if (!ir) { | |
454 | retval = -ENODEV; | |
455 | goto error; | |
456 | } | |
457 | ||
458 | dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); | |
459 | ||
460 | if (ir->d.minor == NOPLUG) { | |
461 | retval = -ENODEV; | |
462 | goto error; | |
463 | } | |
464 | ||
465 | if (ir->open) { | |
466 | retval = -EBUSY; | |
467 | goto error; | |
468 | } | |
469 | ||
8de111e2 | 470 | cdev = ir->cdev; |
c1cbb702 JW |
471 | if (try_module_get(cdev->owner)) { |
472 | ir->open++; | |
4a62a5ab JW |
473 | retval = ir->d.set_use_inc(ir->d.data); |
474 | ||
475 | if (retval) { | |
c1cbb702 JW |
476 | module_put(cdev->owner); |
477 | ir->open--; | |
4a62a5ab JW |
478 | } else { |
479 | lirc_buffer_clear(ir->buf); | |
480 | } | |
481 | if (ir->task) | |
482 | wake_up_process(ir->task); | |
483 | } | |
484 | ||
485 | error: | |
486 | if (ir) | |
487 | dev_dbg(ir->d.dev, LOGHEAD "open result = %d\n", | |
488 | ir->d.name, ir->d.minor, retval); | |
489 | ||
490 | mutex_unlock(&lirc_dev_lock); | |
491 | ||
d9d2e9d5 AB |
492 | nonseekable_open(inode, file); |
493 | ||
4a62a5ab JW |
494 | return retval; |
495 | } | |
496 | EXPORT_SYMBOL(lirc_dev_fop_open); | |
497 | ||
498 | int lirc_dev_fop_close(struct inode *inode, struct file *file) | |
499 | { | |
500 | struct irctl *ir = irctls[iminor(inode)]; | |
8de111e2 | 501 | struct cdev *cdev; |
4a62a5ab | 502 | |
715d29a7 JW |
503 | if (!ir) { |
504 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
505 | return -EINVAL; | |
506 | } | |
4a62a5ab | 507 | |
8de111e2 JW |
508 | cdev = ir->cdev; |
509 | ||
4a62a5ab JW |
510 | dev_dbg(ir->d.dev, LOGHEAD "close called\n", ir->d.name, ir->d.minor); |
511 | ||
512 | WARN_ON(mutex_lock_killable(&lirc_dev_lock)); | |
513 | ||
715d29a7 | 514 | ir->open--; |
4a62a5ab JW |
515 | if (ir->attached) { |
516 | ir->d.set_use_dec(ir->d.data); | |
c1cbb702 | 517 | module_put(cdev->owner); |
4a62a5ab | 518 | } else { |
578fcb8e | 519 | lirc_irctl_cleanup(ir); |
c1cbb702 | 520 | cdev_del(cdev); |
4a62a5ab | 521 | irctls[ir->d.minor] = NULL; |
8de111e2 | 522 | kfree(cdev); |
4a62a5ab JW |
523 | kfree(ir); |
524 | } | |
525 | ||
526 | mutex_unlock(&lirc_dev_lock); | |
527 | ||
528 | return 0; | |
529 | } | |
530 | EXPORT_SYMBOL(lirc_dev_fop_close); | |
531 | ||
532 | unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) | |
533 | { | |
534 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; | |
535 | unsigned int ret; | |
536 | ||
715d29a7 JW |
537 | if (!ir) { |
538 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
539 | return POLLERR; | |
540 | } | |
541 | ||
4a62a5ab JW |
542 | dev_dbg(ir->d.dev, LOGHEAD "poll called\n", ir->d.name, ir->d.minor); |
543 | ||
5c769a68 | 544 | if (!ir->attached) |
4a62a5ab | 545 | return POLLERR; |
4a62a5ab JW |
546 | |
547 | poll_wait(file, &ir->buf->wait_poll, wait); | |
548 | ||
549 | if (ir->buf) | |
550 | if (lirc_buffer_empty(ir->buf)) | |
551 | ret = 0; | |
552 | else | |
553 | ret = POLLIN | POLLRDNORM; | |
554 | else | |
555 | ret = POLLERR; | |
556 | ||
557 | dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", | |
558 | ir->d.name, ir->d.minor, ret); | |
559 | ||
560 | return ret; | |
561 | } | |
562 | EXPORT_SYMBOL(lirc_dev_fop_poll); | |
563 | ||
044e5878 | 564 | long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
4a62a5ab | 565 | { |
be1f985f | 566 | __u32 mode; |
4a62a5ab | 567 | int result = 0; |
d889a135 | 568 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; |
4a62a5ab | 569 | |
8be292cc JW |
570 | if (!ir) { |
571 | printk(KERN_ERR "lirc_dev: %s: no irctl found!\n", __func__); | |
572 | return -ENODEV; | |
573 | } | |
4a62a5ab JW |
574 | |
575 | dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", | |
576 | ir->d.name, ir->d.minor, cmd); | |
577 | ||
578 | if (ir->d.minor == NOPLUG || !ir->attached) { | |
579 | dev_dbg(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", | |
580 | ir->d.name, ir->d.minor); | |
581 | return -ENODEV; | |
582 | } | |
583 | ||
584 | mutex_lock(&ir->irctl_lock); | |
585 | ||
586 | switch (cmd) { | |
587 | case LIRC_GET_FEATURES: | |
be1f985f | 588 | result = put_user(ir->d.features, (__u32 *)arg); |
4a62a5ab JW |
589 | break; |
590 | case LIRC_GET_REC_MODE: | |
591 | if (!(ir->d.features & LIRC_CAN_REC_MASK)) { | |
592 | result = -ENOSYS; | |
593 | break; | |
594 | } | |
595 | ||
596 | result = put_user(LIRC_REC2MODE | |
597 | (ir->d.features & LIRC_CAN_REC_MASK), | |
be1f985f | 598 | (__u32 *)arg); |
4a62a5ab JW |
599 | break; |
600 | case LIRC_SET_REC_MODE: | |
601 | if (!(ir->d.features & LIRC_CAN_REC_MASK)) { | |
602 | result = -ENOSYS; | |
603 | break; | |
604 | } | |
605 | ||
be1f985f | 606 | result = get_user(mode, (__u32 *)arg); |
4a62a5ab JW |
607 | if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) |
608 | result = -EINVAL; | |
609 | /* | |
610 | * FIXME: We should actually set the mode somehow but | |
611 | * for now, lirc_serial doesn't support mode changing either | |
612 | */ | |
613 | break; | |
614 | case LIRC_GET_LENGTH: | |
be1f985f | 615 | result = put_user(ir->d.code_length, (__u32 *)arg); |
4a62a5ab JW |
616 | break; |
617 | case LIRC_GET_MIN_TIMEOUT: | |
618 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
619 | ir->d.min_timeout == 0) { | |
620 | result = -ENOSYS; | |
621 | break; | |
622 | } | |
623 | ||
be1f985f | 624 | result = put_user(ir->d.min_timeout, (__u32 *)arg); |
4a62a5ab JW |
625 | break; |
626 | case LIRC_GET_MAX_TIMEOUT: | |
627 | if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || | |
628 | ir->d.max_timeout == 0) { | |
629 | result = -ENOSYS; | |
630 | break; | |
631 | } | |
632 | ||
be1f985f | 633 | result = put_user(ir->d.max_timeout, (__u32 *)arg); |
4a62a5ab JW |
634 | break; |
635 | default: | |
636 | result = -EINVAL; | |
637 | } | |
638 | ||
639 | dev_dbg(ir->d.dev, LOGHEAD "ioctl result = %d\n", | |
640 | ir->d.name, ir->d.minor, result); | |
641 | ||
642 | mutex_unlock(&ir->irctl_lock); | |
643 | ||
644 | return result; | |
645 | } | |
646 | EXPORT_SYMBOL(lirc_dev_fop_ioctl); | |
647 | ||
648 | ssize_t lirc_dev_fop_read(struct file *file, | |
0e835087 | 649 | char __user *buffer, |
4a62a5ab JW |
650 | size_t length, |
651 | loff_t *ppos) | |
652 | { | |
653 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; | |
715d29a7 | 654 | unsigned char *buf; |
4a62a5ab JW |
655 | int ret = 0, written = 0; |
656 | DECLARE_WAITQUEUE(wait, current); | |
657 | ||
715d29a7 JW |
658 | if (!ir) { |
659 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
660 | return -ENODEV; | |
661 | } | |
662 | ||
4a62a5ab JW |
663 | dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); |
664 | ||
715d29a7 JW |
665 | buf = kzalloc(ir->chunk_size, GFP_KERNEL); |
666 | if (!buf) | |
667 | return -ENOMEM; | |
668 | ||
250f7a5f DC |
669 | if (mutex_lock_interruptible(&ir->irctl_lock)) { |
670 | ret = -ERESTARTSYS; | |
671 | goto out_unlocked; | |
672 | } | |
4a62a5ab | 673 | if (!ir->attached) { |
250f7a5f DC |
674 | ret = -ENODEV; |
675 | goto out_locked; | |
4a62a5ab JW |
676 | } |
677 | ||
678 | if (length % ir->chunk_size) { | |
250f7a5f DC |
679 | ret = -EINVAL; |
680 | goto out_locked; | |
4a62a5ab JW |
681 | } |
682 | ||
683 | /* | |
684 | * we add ourselves to the task queue before buffer check | |
685 | * to avoid losing scan code (in case when queue is awaken somewhere | |
686 | * between while condition checking and scheduling) | |
687 | */ | |
688 | add_wait_queue(&ir->buf->wait_poll, &wait); | |
689 | set_current_state(TASK_INTERRUPTIBLE); | |
690 | ||
691 | /* | |
692 | * while we didn't provide 'length' bytes, device is opened in blocking | |
693 | * mode and 'copy_to_user' is happy, wait for data. | |
694 | */ | |
695 | while (written < length && ret == 0) { | |
696 | if (lirc_buffer_empty(ir->buf)) { | |
697 | /* According to the read(2) man page, 'written' can be | |
698 | * returned as less than 'length', instead of blocking | |
699 | * again, returning -EWOULDBLOCK, or returning | |
700 | * -ERESTARTSYS */ | |
701 | if (written) | |
702 | break; | |
703 | if (file->f_flags & O_NONBLOCK) { | |
704 | ret = -EWOULDBLOCK; | |
705 | break; | |
706 | } | |
707 | if (signal_pending(current)) { | |
708 | ret = -ERESTARTSYS; | |
709 | break; | |
710 | } | |
711 | ||
712 | mutex_unlock(&ir->irctl_lock); | |
713 | schedule(); | |
714 | set_current_state(TASK_INTERRUPTIBLE); | |
715 | ||
716 | if (mutex_lock_interruptible(&ir->irctl_lock)) { | |
717 | ret = -ERESTARTSYS; | |
69c271f3 JW |
718 | remove_wait_queue(&ir->buf->wait_poll, &wait); |
719 | set_current_state(TASK_RUNNING); | |
720 | goto out_unlocked; | |
4a62a5ab JW |
721 | } |
722 | ||
723 | if (!ir->attached) { | |
724 | ret = -ENODEV; | |
725 | break; | |
726 | } | |
727 | } else { | |
728 | lirc_buffer_read(ir->buf, buf); | |
729 | ret = copy_to_user((void *)buffer+written, buf, | |
730 | ir->buf->chunk_size); | |
250f7a5f DC |
731 | if (!ret) |
732 | written += ir->buf->chunk_size; | |
733 | else | |
734 | ret = -EFAULT; | |
4a62a5ab JW |
735 | } |
736 | } | |
737 | ||
738 | remove_wait_queue(&ir->buf->wait_poll, &wait); | |
739 | set_current_state(TASK_RUNNING); | |
250f7a5f DC |
740 | |
741 | out_locked: | |
4a62a5ab JW |
742 | mutex_unlock(&ir->irctl_lock); |
743 | ||
69c271f3 | 744 | out_unlocked: |
715d29a7 | 745 | kfree(buf); |
4a62a5ab | 746 | dev_dbg(ir->d.dev, LOGHEAD "read result = %s (%d)\n", |
250f7a5f | 747 | ir->d.name, ir->d.minor, ret ? "<fail>" : "<ok>", ret); |
4a62a5ab JW |
748 | |
749 | return ret ? ret : written; | |
750 | } | |
751 | EXPORT_SYMBOL(lirc_dev_fop_read); | |
752 | ||
753 | void *lirc_get_pdata(struct file *file) | |
754 | { | |
755 | void *data = NULL; | |
756 | ||
757 | if (file && file->f_dentry && file->f_dentry->d_inode && | |
758 | file->f_dentry->d_inode->i_rdev) { | |
759 | struct irctl *ir; | |
760 | ir = irctls[iminor(file->f_dentry->d_inode)]; | |
761 | data = ir->d.data; | |
762 | } | |
763 | ||
764 | return data; | |
765 | } | |
766 | EXPORT_SYMBOL(lirc_get_pdata); | |
767 | ||
768 | ||
0e835087 | 769 | ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer, |
4a62a5ab JW |
770 | size_t length, loff_t *ppos) |
771 | { | |
772 | struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; | |
773 | ||
715d29a7 JW |
774 | if (!ir) { |
775 | printk(KERN_ERR "%s: called with invalid irctl\n", __func__); | |
776 | return -ENODEV; | |
777 | } | |
778 | ||
4a62a5ab JW |
779 | dev_dbg(ir->d.dev, LOGHEAD "write called\n", ir->d.name, ir->d.minor); |
780 | ||
781 | if (!ir->attached) | |
782 | return -ENODEV; | |
783 | ||
784 | return -EINVAL; | |
785 | } | |
786 | EXPORT_SYMBOL(lirc_dev_fop_write); | |
787 | ||
788 | ||
789 | static int __init lirc_dev_init(void) | |
790 | { | |
791 | int retval; | |
792 | ||
793 | lirc_class = class_create(THIS_MODULE, "lirc"); | |
794 | if (IS_ERR(lirc_class)) { | |
795 | retval = PTR_ERR(lirc_class); | |
796 | printk(KERN_ERR "lirc_dev: class_create failed\n"); | |
797 | goto error; | |
798 | } | |
799 | ||
800 | retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, | |
801 | IRCTL_DEV_NAME); | |
802 | if (retval) { | |
803 | class_destroy(lirc_class); | |
804 | printk(KERN_ERR "lirc_dev: alloc_chrdev_region failed\n"); | |
805 | goto error; | |
806 | } | |
807 | ||
808 | ||
809 | printk(KERN_INFO "lirc_dev: IR Remote Control driver registered, " | |
810 | "major %d \n", MAJOR(lirc_base_dev)); | |
811 | ||
812 | error: | |
813 | return retval; | |
814 | } | |
815 | ||
816 | ||
817 | ||
818 | static void __exit lirc_dev_exit(void) | |
819 | { | |
820 | class_destroy(lirc_class); | |
821 | unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); | |
822 | printk(KERN_INFO "lirc_dev: module unloaded\n"); | |
823 | } | |
824 | ||
825 | module_init(lirc_dev_init); | |
826 | module_exit(lirc_dev_exit); | |
827 | ||
828 | MODULE_DESCRIPTION("LIRC base driver module"); | |
829 | MODULE_AUTHOR("Artur Lipowski"); | |
830 | MODULE_LICENSE("GPL"); | |
831 | ||
832 | module_param(debug, bool, S_IRUGO | S_IWUSR); | |
833 | MODULE_PARM_DESC(debug, "Enable debugging messages"); |