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1 | /* |
2 | * Hardware dependent layer |
3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
4 | * |
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/major.h> |
23 | #include <linux/init.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/time.h> |
26 | #include <linux/mutex.h> |
27 | #include <linux/module.h> |
28 | #include <sound/core.h> |
29 | #include <sound/control.h> |
30 | #include <sound/minors.h> |
31 | #include <sound/hwdep.h> |
32 | #include <sound/info.h> |
33 | |
34 | MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); |
35 | MODULE_DESCRIPTION("Hardware dependent layer"); |
36 | MODULE_LICENSE("GPL"); |
37 | |
38 | static LIST_HEAD(snd_hwdep_devices); |
39 | static DEFINE_MUTEX(register_mutex); |
40 | |
41 | static int snd_hwdep_free(struct snd_hwdep *hwdep); |
42 | static int snd_hwdep_dev_free(struct snd_device *device); |
43 | static int snd_hwdep_dev_register(struct snd_device *device); |
44 | static int snd_hwdep_dev_disconnect(struct snd_device *device); |
45 | |
46 | |
47 | static struct snd_hwdep *snd_hwdep_search(struct snd_card *card, int device) |
48 | { |
49 | struct snd_hwdep *hwdep; |
50 | |
51 | list_for_each_entry(hwdep, &snd_hwdep_devices, list) |
52 | if (hwdep->card == card && hwdep->device == device) |
53 | return hwdep; |
54 | return NULL; |
55 | } |
56 | |
57 | static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig) |
58 | { |
59 | struct snd_hwdep *hw = file->private_data; |
60 | if (hw->ops.llseek) |
61 | return hw->ops.llseek(hw, file, offset, orig); |
62 | return -ENXIO; |
63 | } |
64 | |
65 | static ssize_t snd_hwdep_read(struct file * file, char __user *buf, |
66 | size_t count, loff_t *offset) |
67 | { |
68 | struct snd_hwdep *hw = file->private_data; |
69 | if (hw->ops.read) |
70 | return hw->ops.read(hw, buf, count, offset); |
71 | return -ENXIO; |
72 | } |
73 | |
74 | static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, |
75 | size_t count, loff_t *offset) |
76 | { |
77 | struct snd_hwdep *hw = file->private_data; |
78 | if (hw->ops.write) |
79 | return hw->ops.write(hw, buf, count, offset); |
80 | return -ENXIO; |
81 | } |
82 | |
83 | static int snd_hwdep_open(struct inode *inode, struct file * file) |
84 | { |
85 | int major = imajor(inode); |
86 | struct snd_hwdep *hw; |
87 | int err; |
88 | wait_queue_t wait; |
89 | |
90 | if (major == snd_major) { |
91 | hw = snd_lookup_minor_data(iminor(inode), |
92 | SNDRV_DEVICE_TYPE_HWDEP); |
93 | #ifdef CONFIG_SND_OSSEMUL |
94 | } else if (major == SOUND_MAJOR) { |
95 | hw = snd_lookup_oss_minor_data(iminor(inode), |
96 | SNDRV_OSS_DEVICE_TYPE_DMFM); |
97 | #endif |
98 | } else |
99 | return -ENXIO; |
100 | if (hw == NULL) |
101 | return -ENODEV; |
102 | |
103 | if (!try_module_get(hw->card->module)) { |
104 | snd_card_unref(hw->card); |
105 | return -EFAULT; |
106 | } |
107 | |
108 | init_waitqueue_entry(&wait, current); |
109 | add_wait_queue(&hw->open_wait, &wait); |
110 | mutex_lock(&hw->open_mutex); |
111 | while (1) { |
112 | if (hw->exclusive && hw->used > 0) { |
113 | err = -EBUSY; |
114 | break; |
115 | } |
116 | if (!hw->ops.open) { |
117 | err = 0; |
118 | break; |
119 | } |
120 | err = hw->ops.open(hw, file); |
121 | if (err >= 0) |
122 | break; |
123 | if (err == -EAGAIN) { |
124 | if (file->f_flags & O_NONBLOCK) { |
125 | err = -EBUSY; |
126 | break; |
127 | } |
128 | } else |
129 | break; |
130 | set_current_state(TASK_INTERRUPTIBLE); |
131 | mutex_unlock(&hw->open_mutex); |
132 | schedule(); |
133 | mutex_lock(&hw->open_mutex); |
134 | if (hw->card->shutdown) { |
135 | err = -ENODEV; |
136 | break; |
137 | } |
138 | if (signal_pending(current)) { |
139 | err = -ERESTARTSYS; |
140 | break; |
141 | } |
142 | } |
143 | remove_wait_queue(&hw->open_wait, &wait); |
144 | if (err >= 0) { |
145 | err = snd_card_file_add(hw->card, file); |
146 | if (err >= 0) { |
147 | file->private_data = hw; |
148 | hw->used++; |
149 | } else { |
150 | if (hw->ops.release) |
151 | hw->ops.release(hw, file); |
152 | } |
153 | } |
154 | mutex_unlock(&hw->open_mutex); |
155 | if (err < 0) |
156 | module_put(hw->card->module); |
157 | snd_card_unref(hw->card); |
158 | return err; |
159 | } |
160 | |
161 | static int snd_hwdep_release(struct inode *inode, struct file * file) |
162 | { |
163 | int err = 0; |
164 | struct snd_hwdep *hw = file->private_data; |
165 | struct module *mod = hw->card->module; |
166 | |
167 | mutex_lock(&hw->open_mutex); |
168 | if (hw->ops.release) |
169 | err = hw->ops.release(hw, file); |
170 | if (hw->used > 0) |
171 | hw->used--; |
172 | mutex_unlock(&hw->open_mutex); |
173 | wake_up(&hw->open_wait); |
174 | |
175 | snd_card_file_remove(hw->card, file); |
176 | module_put(mod); |
177 | return err; |
178 | } |
179 | |
180 | static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait) |
181 | { |
182 | struct snd_hwdep *hw = file->private_data; |
183 | if (hw->ops.poll) |
184 | return hw->ops.poll(hw, file, wait); |
185 | return 0; |
186 | } |
187 | |
188 | static int snd_hwdep_info(struct snd_hwdep *hw, |
189 | struct snd_hwdep_info __user *_info) |
190 | { |
191 | struct snd_hwdep_info info; |
192 | |
193 | memset(&info, 0, sizeof(info)); |
194 | info.card = hw->card->number; |
195 | strlcpy(info.id, hw->id, sizeof(info.id)); |
196 | strlcpy(info.name, hw->name, sizeof(info.name)); |
197 | info.iface = hw->iface; |
198 | if (copy_to_user(_info, &info, sizeof(info))) |
199 | return -EFAULT; |
200 | return 0; |
201 | } |
202 | |
203 | static int snd_hwdep_dsp_status(struct snd_hwdep *hw, |
204 | struct snd_hwdep_dsp_status __user *_info) |
205 | { |
206 | struct snd_hwdep_dsp_status info; |
207 | int err; |
208 | |
209 | if (! hw->ops.dsp_status) |
210 | return -ENXIO; |
211 | memset(&info, 0, sizeof(info)); |
212 | info.dsp_loaded = hw->dsp_loaded; |
213 | if ((err = hw->ops.dsp_status(hw, &info)) < 0) |
214 | return err; |
215 | if (copy_to_user(_info, &info, sizeof(info))) |
216 | return -EFAULT; |
217 | return 0; |
218 | } |
219 | |
220 | static int snd_hwdep_dsp_load(struct snd_hwdep *hw, |
221 | struct snd_hwdep_dsp_image __user *_info) |
222 | { |
223 | struct snd_hwdep_dsp_image info; |
224 | int err; |
225 | |
226 | if (! hw->ops.dsp_load) |
227 | return -ENXIO; |
228 | memset(&info, 0, sizeof(info)); |
229 | if (copy_from_user(&info, _info, sizeof(info))) |
230 | return -EFAULT; |
231 | /* check whether the dsp was already loaded */ |
232 | if (hw->dsp_loaded & (1 << info.index)) |
233 | return -EBUSY; |
234 | if (!access_ok(VERIFY_READ, info.image, info.length)) |
235 | return -EFAULT; |
236 | err = hw->ops.dsp_load(hw, &info); |
237 | if (err < 0) |
238 | return err; |
239 | hw->dsp_loaded |= (1 << info.index); |
240 | return 0; |
241 | } |
242 | |
243 | static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, |
244 | unsigned long arg) |
245 | { |
246 | struct snd_hwdep *hw = file->private_data; |
247 | void __user *argp = (void __user *)arg; |
248 | switch (cmd) { |
249 | case SNDRV_HWDEP_IOCTL_PVERSION: |
250 | return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp); |
251 | case SNDRV_HWDEP_IOCTL_INFO: |
252 | return snd_hwdep_info(hw, argp); |
253 | case SNDRV_HWDEP_IOCTL_DSP_STATUS: |
254 | return snd_hwdep_dsp_status(hw, argp); |
255 | case SNDRV_HWDEP_IOCTL_DSP_LOAD: |
256 | return snd_hwdep_dsp_load(hw, argp); |
257 | } |
258 | if (hw->ops.ioctl) |
259 | return hw->ops.ioctl(hw, file, cmd, arg); |
260 | return -ENOTTY; |
261 | } |
262 | |
263 | static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma) |
264 | { |
265 | struct snd_hwdep *hw = file->private_data; |
266 | if (hw->ops.mmap) |
267 | return hw->ops.mmap(hw, file, vma); |
268 | return -ENXIO; |
269 | } |
270 | |
271 | static int snd_hwdep_control_ioctl(struct snd_card *card, |
272 | struct snd_ctl_file * control, |
273 | unsigned int cmd, unsigned long arg) |
274 | { |
275 | switch (cmd) { |
276 | case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE: |
277 | { |
278 | int device; |
279 | |
280 | if (get_user(device, (int __user *)arg)) |
281 | return -EFAULT; |
282 | mutex_lock(®ister_mutex); |
283 | |
284 | if (device < 0) |
285 | device = 0; |
286 | else if (device < SNDRV_MINOR_HWDEPS) |
287 | device++; |
288 | else |
289 | device = SNDRV_MINOR_HWDEPS; |
290 | |
291 | while (device < SNDRV_MINOR_HWDEPS) { |
292 | if (snd_hwdep_search(card, device)) |
293 | break; |
294 | device++; |
295 | } |
296 | if (device >= SNDRV_MINOR_HWDEPS) |
297 | device = -1; |
298 | mutex_unlock(®ister_mutex); |
299 | if (put_user(device, (int __user *)arg)) |
300 | return -EFAULT; |
301 | return 0; |
302 | } |
303 | case SNDRV_CTL_IOCTL_HWDEP_INFO: |
304 | { |
305 | struct snd_hwdep_info __user *info = (struct snd_hwdep_info __user *)arg; |
306 | int device, err; |
307 | struct snd_hwdep *hwdep; |
308 | |
309 | if (get_user(device, &info->device)) |
310 | return -EFAULT; |
311 | mutex_lock(®ister_mutex); |
312 | hwdep = snd_hwdep_search(card, device); |
313 | if (hwdep) |
314 | err = snd_hwdep_info(hwdep, info); |
315 | else |
316 | err = -ENXIO; |
317 | mutex_unlock(®ister_mutex); |
318 | return err; |
319 | } |
320 | } |
321 | return -ENOIOCTLCMD; |
322 | } |
323 | |
324 | #ifdef CONFIG_COMPAT |
325 | #include "hwdep_compat.c" |
326 | #else |
327 | #define snd_hwdep_ioctl_compat NULL |
328 | #endif |
329 | |
330 | /* |
331 | |
332 | */ |
333 | |
334 | static const struct file_operations snd_hwdep_f_ops = |
335 | { |
336 | .owner = THIS_MODULE, |
337 | .llseek = snd_hwdep_llseek, |
338 | .read = snd_hwdep_read, |
339 | .write = snd_hwdep_write, |
340 | .open = snd_hwdep_open, |
341 | .release = snd_hwdep_release, |
342 | .poll = snd_hwdep_poll, |
343 | .unlocked_ioctl = snd_hwdep_ioctl, |
344 | .compat_ioctl = snd_hwdep_ioctl_compat, |
345 | .mmap = snd_hwdep_mmap, |
346 | }; |
347 | |
348 | /** |
349 | * snd_hwdep_new - create a new hwdep instance |
350 | * @card: the card instance |
351 | * @id: the id string |
352 | * @device: the device index (zero-based) |
353 | * @rhwdep: the pointer to store the new hwdep instance |
354 | * |
355 | * Creates a new hwdep instance with the given index on the card. |
356 | * The callbacks (hwdep->ops) must be set on the returned instance |
357 | * after this call manually by the caller. |
358 | * |
359 | * Return: Zero if successful, or a negative error code on failure. |
360 | */ |
361 | int snd_hwdep_new(struct snd_card *card, char *id, int device, |
362 | struct snd_hwdep **rhwdep) |
363 | { |
364 | struct snd_hwdep *hwdep; |
365 | int err; |
366 | static struct snd_device_ops ops = { |
367 | .dev_free = snd_hwdep_dev_free, |
368 | .dev_register = snd_hwdep_dev_register, |
369 | .dev_disconnect = snd_hwdep_dev_disconnect, |
370 | }; |
371 | |
372 | if (snd_BUG_ON(!card)) |
373 | return -ENXIO; |
374 | if (rhwdep) |
375 | *rhwdep = NULL; |
376 | hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL); |
377 | if (hwdep == NULL) { |
378 | snd_printk(KERN_ERR "hwdep: cannot allocate\n"); |
379 | return -ENOMEM; |
380 | } |
381 | hwdep->card = card; |
382 | hwdep->device = device; |
383 | if (id) |
384 | strlcpy(hwdep->id, id, sizeof(hwdep->id)); |
385 | #ifdef CONFIG_SND_OSSEMUL |
386 | hwdep->oss_type = -1; |
387 | #endif |
388 | if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) { |
389 | snd_hwdep_free(hwdep); |
390 | return err; |
391 | } |
392 | init_waitqueue_head(&hwdep->open_wait); |
393 | mutex_init(&hwdep->open_mutex); |
394 | if (rhwdep) |
395 | *rhwdep = hwdep; |
396 | return 0; |
397 | } |
398 | |
399 | static int snd_hwdep_free(struct snd_hwdep *hwdep) |
400 | { |
401 | if (!hwdep) |
402 | return 0; |
403 | if (hwdep->private_free) |
404 | hwdep->private_free(hwdep); |
405 | kfree(hwdep); |
406 | return 0; |
407 | } |
408 | |
409 | static int snd_hwdep_dev_free(struct snd_device *device) |
410 | { |
411 | struct snd_hwdep *hwdep = device->device_data; |
412 | return snd_hwdep_free(hwdep); |
413 | } |
414 | |
415 | static int snd_hwdep_dev_register(struct snd_device *device) |
416 | { |
417 | struct snd_hwdep *hwdep = device->device_data; |
418 | int err; |
419 | char name[32]; |
420 | |
421 | mutex_lock(®ister_mutex); |
422 | if (snd_hwdep_search(hwdep->card, hwdep->device)) { |
423 | mutex_unlock(®ister_mutex); |
424 | return -EBUSY; |
425 | } |
426 | list_add_tail(&hwdep->list, &snd_hwdep_devices); |
427 | sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device); |
428 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP, |
429 | hwdep->card, hwdep->device, |
430 | &snd_hwdep_f_ops, hwdep, name)) < 0) { |
431 | snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n", |
432 | hwdep->card->number, hwdep->device); |
433 | list_del(&hwdep->list); |
434 | mutex_unlock(®ister_mutex); |
435 | return err; |
436 | } |
437 | #ifdef CONFIG_SND_OSSEMUL |
438 | hwdep->ossreg = 0; |
439 | if (hwdep->oss_type >= 0) { |
440 | if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) { |
441 | snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n"); |
442 | } else { |
443 | if (snd_register_oss_device(hwdep->oss_type, |
444 | hwdep->card, hwdep->device, |
445 | &snd_hwdep_f_ops, hwdep, |
446 | hwdep->oss_dev) < 0) { |
447 | snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n", |
448 | hwdep->card->number, hwdep->device); |
449 | } else |
450 | hwdep->ossreg = 1; |
451 | } |
452 | } |
453 | #endif |
454 | mutex_unlock(®ister_mutex); |
455 | return 0; |
456 | } |
457 | |
458 | static int snd_hwdep_dev_disconnect(struct snd_device *device) |
459 | { |
460 | struct snd_hwdep *hwdep = device->device_data; |
461 | |
462 | if (snd_BUG_ON(!hwdep)) |
463 | return -ENXIO; |
464 | mutex_lock(®ister_mutex); |
465 | if (snd_hwdep_search(hwdep->card, hwdep->device) != hwdep) { |
466 | mutex_unlock(®ister_mutex); |
467 | return -EINVAL; |
468 | } |
469 | mutex_lock(&hwdep->open_mutex); |
470 | wake_up(&hwdep->open_wait); |
471 | #ifdef CONFIG_SND_OSSEMUL |
472 | if (hwdep->ossreg) |
473 | snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device); |
474 | #endif |
475 | snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device); |
476 | list_del_init(&hwdep->list); |
477 | mutex_unlock(&hwdep->open_mutex); |
478 | mutex_unlock(®ister_mutex); |
479 | return 0; |
480 | } |
481 | |
482 | #ifdef CONFIG_PROC_FS |
483 | /* |
484 | * Info interface |
485 | */ |
486 | |
487 | static void snd_hwdep_proc_read(struct snd_info_entry *entry, |
488 | struct snd_info_buffer *buffer) |
489 | { |
490 | struct snd_hwdep *hwdep; |
491 | |
492 | mutex_lock(®ister_mutex); |
493 | list_for_each_entry(hwdep, &snd_hwdep_devices, list) |
494 | snd_iprintf(buffer, "%02i-%02i: %s\n", |
495 | hwdep->card->number, hwdep->device, hwdep->name); |
496 | mutex_unlock(®ister_mutex); |
497 | } |
498 | |
499 | static struct snd_info_entry *snd_hwdep_proc_entry; |
500 | |
501 | static void __init snd_hwdep_proc_init(void) |
502 | { |
503 | struct snd_info_entry *entry; |
504 | |
505 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) { |
506 | entry->c.text.read = snd_hwdep_proc_read; |
507 | if (snd_info_register(entry) < 0) { |
508 | snd_info_free_entry(entry); |
509 | entry = NULL; |
510 | } |
511 | } |
512 | snd_hwdep_proc_entry = entry; |
513 | } |
514 | |
515 | static void __exit snd_hwdep_proc_done(void) |
516 | { |
517 | snd_info_free_entry(snd_hwdep_proc_entry); |
518 | } |
519 | #else /* !CONFIG_PROC_FS */ |
520 | #define snd_hwdep_proc_init() |
521 | #define snd_hwdep_proc_done() |
522 | #endif /* CONFIG_PROC_FS */ |
523 | |
524 | |
525 | /* |
526 | * ENTRY functions |
527 | */ |
528 | |
529 | static int __init alsa_hwdep_init(void) |
530 | { |
531 | snd_hwdep_proc_init(); |
532 | snd_ctl_register_ioctl(snd_hwdep_control_ioctl); |
533 | snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl); |
534 | return 0; |
535 | } |
536 | |
537 | static void __exit alsa_hwdep_exit(void) |
538 | { |
539 | snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl); |
540 | snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl); |
541 | snd_hwdep_proc_done(); |
542 | } |
543 | |
544 | module_init(alsa_hwdep_init) |
545 | module_exit(alsa_hwdep_exit) |
546 | |
547 | EXPORT_SYMBOL(snd_hwdep_new); |
548 |
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