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