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1da177e4 LT |
1 | /* |
2 | * Hardware dependent layer | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> | |
23 | #include <linux/major.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/smp_lock.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/time.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@suse.cz>"); | |
35 | MODULE_DESCRIPTION("Hardware dependent layer"); | |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
38 | static snd_hwdep_t *snd_hwdep_devices[SNDRV_CARDS * SNDRV_MINOR_HWDEPS]; | |
39 | ||
40 | static DECLARE_MUTEX(register_mutex); | |
41 | ||
42 | static int snd_hwdep_free(snd_hwdep_t *hwdep); | |
43 | static int snd_hwdep_dev_free(snd_device_t *device); | |
44 | static int snd_hwdep_dev_register(snd_device_t *device); | |
45 | static int snd_hwdep_dev_unregister(snd_device_t *device); | |
46 | ||
47 | /* | |
48 | ||
49 | */ | |
50 | ||
51 | static loff_t snd_hwdep_llseek(struct file * file, loff_t offset, int orig) | |
52 | { | |
53 | snd_hwdep_t *hw = file->private_data; | |
54 | if (hw->ops.llseek) | |
55 | return hw->ops.llseek(hw, file, offset, orig); | |
56 | return -ENXIO; | |
57 | } | |
58 | ||
59 | static ssize_t snd_hwdep_read(struct file * file, char __user *buf, size_t count, loff_t *offset) | |
60 | { | |
61 | snd_hwdep_t *hw = file->private_data; | |
62 | if (hw->ops.read) | |
63 | return hw->ops.read(hw, buf, count, offset); | |
64 | return -ENXIO; | |
65 | } | |
66 | ||
67 | static ssize_t snd_hwdep_write(struct file * file, const char __user *buf, size_t count, loff_t *offset) | |
68 | { | |
69 | snd_hwdep_t *hw = file->private_data; | |
70 | if (hw->ops.write) | |
71 | return hw->ops.write(hw, buf, count, offset); | |
72 | return -ENXIO; | |
73 | } | |
74 | ||
75 | static int snd_hwdep_open(struct inode *inode, struct file * file) | |
76 | { | |
77 | int major = imajor(inode); | |
78 | int cardnum; | |
79 | int device; | |
80 | snd_hwdep_t *hw; | |
81 | int err; | |
82 | wait_queue_t wait; | |
83 | ||
f1902860 | 84 | if (major == snd_major) { |
1da177e4 LT |
85 | cardnum = SNDRV_MINOR_CARD(iminor(inode)); |
86 | device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_HWDEP; | |
1da177e4 | 87 | #ifdef CONFIG_SND_OSSEMUL |
f1902860 | 88 | } else if (major == SOUND_MAJOR) { |
1da177e4 LT |
89 | cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode)); |
90 | device = 0; | |
1da177e4 | 91 | #endif |
f1902860 | 92 | } else |
1da177e4 | 93 | return -ENXIO; |
1da177e4 LT |
94 | cardnum %= SNDRV_CARDS; |
95 | device %= SNDRV_MINOR_HWDEPS; | |
96 | hw = snd_hwdep_devices[(cardnum * SNDRV_MINOR_HWDEPS) + device]; | |
97 | if (hw == NULL) | |
98 | return -ENODEV; | |
99 | ||
100 | if (!hw->ops.open) | |
101 | return -ENXIO; | |
102 | #ifdef CONFIG_SND_OSSEMUL | |
103 | if (major == SOUND_MAJOR && hw->oss_type < 0) | |
104 | return -ENXIO; | |
105 | #endif | |
106 | ||
107 | if (!try_module_get(hw->card->module)) | |
108 | return -EFAULT; | |
109 | ||
110 | init_waitqueue_entry(&wait, current); | |
111 | add_wait_queue(&hw->open_wait, &wait); | |
112 | down(&hw->open_mutex); | |
113 | while (1) { | |
114 | if (hw->exclusive && hw->used > 0) { | |
115 | err = -EBUSY; | |
116 | break; | |
117 | } | |
118 | err = hw->ops.open(hw, file); | |
119 | if (err >= 0) | |
120 | break; | |
121 | if (err == -EAGAIN) { | |
122 | if (file->f_flags & O_NONBLOCK) { | |
123 | err = -EBUSY; | |
124 | break; | |
125 | } | |
126 | } else | |
127 | break; | |
128 | set_current_state(TASK_INTERRUPTIBLE); | |
129 | up(&hw->open_mutex); | |
130 | schedule(); | |
131 | down(&hw->open_mutex); | |
132 | if (signal_pending(current)) { | |
133 | err = -ERESTARTSYS; | |
134 | break; | |
135 | } | |
136 | } | |
137 | remove_wait_queue(&hw->open_wait, &wait); | |
138 | if (err >= 0) { | |
139 | err = snd_card_file_add(hw->card, file); | |
140 | if (err >= 0) { | |
141 | file->private_data = hw; | |
142 | hw->used++; | |
143 | } else { | |
144 | if (hw->ops.release) | |
145 | hw->ops.release(hw, file); | |
146 | } | |
147 | } | |
148 | up(&hw->open_mutex); | |
149 | if (err < 0) | |
150 | module_put(hw->card->module); | |
151 | return err; | |
152 | } | |
153 | ||
154 | static int snd_hwdep_release(struct inode *inode, struct file * file) | |
155 | { | |
156 | int err = -ENXIO; | |
157 | snd_hwdep_t *hw = file->private_data; | |
158 | down(&hw->open_mutex); | |
159 | if (hw->ops.release) { | |
160 | err = hw->ops.release(hw, file); | |
161 | wake_up(&hw->open_wait); | |
162 | } | |
163 | if (hw->used > 0) | |
164 | hw->used--; | |
165 | snd_card_file_remove(hw->card, file); | |
166 | up(&hw->open_mutex); | |
167 | module_put(hw->card->module); | |
168 | return err; | |
169 | } | |
170 | ||
171 | static unsigned int snd_hwdep_poll(struct file * file, poll_table * wait) | |
172 | { | |
173 | snd_hwdep_t *hw = file->private_data; | |
174 | if (hw->ops.poll) | |
175 | return hw->ops.poll(hw, file, wait); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int snd_hwdep_info(snd_hwdep_t *hw, snd_hwdep_info_t __user *_info) | |
180 | { | |
181 | snd_hwdep_info_t info; | |
182 | ||
183 | memset(&info, 0, sizeof(info)); | |
184 | info.card = hw->card->number; | |
185 | strlcpy(info.id, hw->id, sizeof(info.id)); | |
186 | strlcpy(info.name, hw->name, sizeof(info.name)); | |
187 | info.iface = hw->iface; | |
188 | if (copy_to_user(_info, &info, sizeof(info))) | |
189 | return -EFAULT; | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int snd_hwdep_dsp_status(snd_hwdep_t *hw, snd_hwdep_dsp_status_t __user *_info) | |
194 | { | |
195 | snd_hwdep_dsp_status_t info; | |
196 | int err; | |
197 | ||
198 | if (! hw->ops.dsp_status) | |
199 | return -ENXIO; | |
200 | memset(&info, 0, sizeof(info)); | |
201 | info.dsp_loaded = hw->dsp_loaded; | |
202 | if ((err = hw->ops.dsp_status(hw, &info)) < 0) | |
203 | return err; | |
204 | if (copy_to_user(_info, &info, sizeof(info))) | |
205 | return -EFAULT; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int snd_hwdep_dsp_load(snd_hwdep_t *hw, snd_hwdep_dsp_image_t __user *_info) | |
210 | { | |
211 | snd_hwdep_dsp_image_t info; | |
212 | int err; | |
213 | ||
214 | if (! hw->ops.dsp_load) | |
215 | return -ENXIO; | |
216 | memset(&info, 0, sizeof(info)); | |
217 | if (copy_from_user(&info, _info, sizeof(info))) | |
218 | return -EFAULT; | |
219 | /* check whether the dsp was already loaded */ | |
220 | if (hw->dsp_loaded & (1 << info.index)) | |
221 | return -EBUSY; | |
222 | if (!access_ok(VERIFY_READ, info.image, info.length)) | |
223 | return -EFAULT; | |
224 | err = hw->ops.dsp_load(hw, &info); | |
225 | if (err < 0) | |
226 | return err; | |
227 | hw->dsp_loaded |= (1 << info.index); | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static long snd_hwdep_ioctl(struct file * file, unsigned int cmd, unsigned long arg) | |
232 | { | |
233 | snd_hwdep_t *hw = file->private_data; | |
234 | void __user *argp = (void __user *)arg; | |
235 | switch (cmd) { | |
236 | case SNDRV_HWDEP_IOCTL_PVERSION: | |
237 | return put_user(SNDRV_HWDEP_VERSION, (int __user *)argp); | |
238 | case SNDRV_HWDEP_IOCTL_INFO: | |
239 | return snd_hwdep_info(hw, argp); | |
240 | case SNDRV_HWDEP_IOCTL_DSP_STATUS: | |
241 | return snd_hwdep_dsp_status(hw, argp); | |
242 | case SNDRV_HWDEP_IOCTL_DSP_LOAD: | |
243 | return snd_hwdep_dsp_load(hw, argp); | |
244 | } | |
245 | if (hw->ops.ioctl) | |
246 | return hw->ops.ioctl(hw, file, cmd, arg); | |
247 | return -ENOTTY; | |
248 | } | |
249 | ||
250 | static int snd_hwdep_mmap(struct file * file, struct vm_area_struct * vma) | |
251 | { | |
252 | snd_hwdep_t *hw = file->private_data; | |
253 | if (hw->ops.mmap) | |
254 | return hw->ops.mmap(hw, file, vma); | |
255 | return -ENXIO; | |
256 | } | |
257 | ||
258 | static int snd_hwdep_control_ioctl(snd_card_t * card, snd_ctl_file_t * control, | |
259 | unsigned int cmd, unsigned long arg) | |
260 | { | |
261 | unsigned int tmp; | |
262 | ||
263 | tmp = card->number * SNDRV_MINOR_HWDEPS; | |
264 | switch (cmd) { | |
265 | case SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE: | |
266 | { | |
267 | int device; | |
268 | ||
269 | if (get_user(device, (int __user *)arg)) | |
270 | return -EFAULT; | |
271 | device = device < 0 ? 0 : device + 1; | |
272 | while (device < SNDRV_MINOR_HWDEPS) { | |
273 | if (snd_hwdep_devices[tmp + device]) | |
274 | break; | |
275 | device++; | |
276 | } | |
277 | if (device >= SNDRV_MINOR_HWDEPS) | |
278 | device = -1; | |
279 | if (put_user(device, (int __user *)arg)) | |
280 | return -EFAULT; | |
281 | return 0; | |
282 | } | |
283 | case SNDRV_CTL_IOCTL_HWDEP_INFO: | |
284 | { | |
285 | snd_hwdep_info_t __user *info = (snd_hwdep_info_t __user *)arg; | |
286 | int device; | |
287 | snd_hwdep_t *hwdep; | |
288 | ||
289 | if (get_user(device, &info->device)) | |
290 | return -EFAULT; | |
291 | if (device < 0 || device >= SNDRV_MINOR_HWDEPS) | |
292 | return -ENXIO; | |
293 | hwdep = snd_hwdep_devices[tmp + device]; | |
294 | if (hwdep == NULL) | |
295 | return -ENXIO; | |
296 | return snd_hwdep_info(hwdep, info); | |
297 | } | |
298 | } | |
299 | return -ENOIOCTLCMD; | |
300 | } | |
301 | ||
302 | #ifdef CONFIG_COMPAT | |
303 | #include "hwdep_compat.c" | |
304 | #else | |
305 | #define snd_hwdep_ioctl_compat NULL | |
306 | #endif | |
307 | ||
308 | /* | |
309 | ||
310 | */ | |
311 | ||
312 | static struct file_operations snd_hwdep_f_ops = | |
313 | { | |
314 | .owner = THIS_MODULE, | |
315 | .llseek = snd_hwdep_llseek, | |
316 | .read = snd_hwdep_read, | |
317 | .write = snd_hwdep_write, | |
318 | .open = snd_hwdep_open, | |
319 | .release = snd_hwdep_release, | |
320 | .poll = snd_hwdep_poll, | |
321 | .unlocked_ioctl = snd_hwdep_ioctl, | |
322 | .compat_ioctl = snd_hwdep_ioctl_compat, | |
323 | .mmap = snd_hwdep_mmap, | |
324 | }; | |
325 | ||
326 | static snd_minor_t snd_hwdep_reg = | |
327 | { | |
328 | .comment = "hardware dependent", | |
329 | .f_ops = &snd_hwdep_f_ops, | |
330 | }; | |
331 | ||
332 | /** | |
333 | * snd_hwdep_new - create a new hwdep instance | |
334 | * @card: the card instance | |
335 | * @id: the id string | |
336 | * @device: the device index (zero-based) | |
337 | * @rhwdep: the pointer to store the new hwdep instance | |
338 | * | |
339 | * Creates a new hwdep instance with the given index on the card. | |
340 | * The callbacks (hwdep->ops) must be set on the returned instance | |
341 | * after this call manually by the caller. | |
342 | * | |
343 | * Returns zero if successful, or a negative error code on failure. | |
344 | */ | |
345 | int snd_hwdep_new(snd_card_t * card, char *id, int device, snd_hwdep_t ** rhwdep) | |
346 | { | |
347 | snd_hwdep_t *hwdep; | |
348 | int err; | |
349 | static snd_device_ops_t ops = { | |
350 | .dev_free = snd_hwdep_dev_free, | |
351 | .dev_register = snd_hwdep_dev_register, | |
352 | .dev_unregister = snd_hwdep_dev_unregister | |
353 | }; | |
354 | ||
355 | snd_assert(rhwdep != NULL, return -EINVAL); | |
356 | *rhwdep = NULL; | |
357 | snd_assert(card != NULL, return -ENXIO); | |
ca2c0966 | 358 | hwdep = kzalloc(sizeof(*hwdep), GFP_KERNEL); |
1da177e4 LT |
359 | if (hwdep == NULL) |
360 | return -ENOMEM; | |
361 | hwdep->card = card; | |
362 | hwdep->device = device; | |
363 | if (id) { | |
364 | strlcpy(hwdep->id, id, sizeof(hwdep->id)); | |
365 | } | |
366 | #ifdef CONFIG_SND_OSSEMUL | |
367 | hwdep->oss_type = -1; | |
368 | #endif | |
369 | if ((err = snd_device_new(card, SNDRV_DEV_HWDEP, hwdep, &ops)) < 0) { | |
370 | snd_hwdep_free(hwdep); | |
371 | return err; | |
372 | } | |
373 | init_waitqueue_head(&hwdep->open_wait); | |
374 | init_MUTEX(&hwdep->open_mutex); | |
375 | *rhwdep = hwdep; | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int snd_hwdep_free(snd_hwdep_t *hwdep) | |
380 | { | |
381 | snd_assert(hwdep != NULL, return -ENXIO); | |
382 | if (hwdep->private_free) | |
383 | hwdep->private_free(hwdep); | |
384 | kfree(hwdep); | |
385 | return 0; | |
386 | } | |
387 | ||
388 | static int snd_hwdep_dev_free(snd_device_t *device) | |
389 | { | |
390 | snd_hwdep_t *hwdep = device->device_data; | |
391 | return snd_hwdep_free(hwdep); | |
392 | } | |
393 | ||
394 | static int snd_hwdep_dev_register(snd_device_t *device) | |
395 | { | |
396 | snd_hwdep_t *hwdep = device->device_data; | |
397 | int idx, err; | |
398 | char name[32]; | |
399 | ||
400 | down(®ister_mutex); | |
401 | idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device; | |
402 | if (snd_hwdep_devices[idx]) { | |
403 | up(®ister_mutex); | |
404 | return -EBUSY; | |
405 | } | |
406 | snd_hwdep_devices[idx] = hwdep; | |
407 | sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device); | |
408 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP, | |
409 | hwdep->card, hwdep->device, | |
410 | &snd_hwdep_reg, name)) < 0) { | |
411 | snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n", | |
412 | hwdep->card->number, hwdep->device); | |
413 | snd_hwdep_devices[idx] = NULL; | |
414 | up(®ister_mutex); | |
415 | return err; | |
416 | } | |
417 | #ifdef CONFIG_SND_OSSEMUL | |
418 | hwdep->ossreg = 0; | |
419 | if (hwdep->oss_type >= 0) { | |
420 | if ((hwdep->oss_type == SNDRV_OSS_DEVICE_TYPE_DMFM) && (hwdep->device != 0)) { | |
421 | snd_printk (KERN_WARNING "only hwdep device 0 can be registered as OSS direct FM device!\n"); | |
422 | } else { | |
423 | if (snd_register_oss_device(hwdep->oss_type, | |
424 | hwdep->card, hwdep->device, | |
425 | &snd_hwdep_reg, hwdep->oss_dev) < 0) { | |
426 | snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n", | |
427 | hwdep->card->number, hwdep->device); | |
428 | } else | |
429 | hwdep->ossreg = 1; | |
430 | } | |
431 | } | |
432 | #endif | |
433 | up(®ister_mutex); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static int snd_hwdep_dev_unregister(snd_device_t *device) | |
438 | { | |
439 | snd_hwdep_t *hwdep = device->device_data; | |
440 | int idx; | |
441 | ||
442 | snd_assert(hwdep != NULL, return -ENXIO); | |
443 | down(®ister_mutex); | |
444 | idx = (hwdep->card->number * SNDRV_MINOR_HWDEPS) + hwdep->device; | |
445 | if (snd_hwdep_devices[idx] != hwdep) { | |
446 | up(®ister_mutex); | |
447 | return -EINVAL; | |
448 | } | |
449 | #ifdef CONFIG_SND_OSSEMUL | |
450 | if (hwdep->ossreg) | |
451 | snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device); | |
452 | #endif | |
453 | snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device); | |
454 | snd_hwdep_devices[idx] = NULL; | |
455 | up(®ister_mutex); | |
456 | return snd_hwdep_free(hwdep); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Info interface | |
461 | */ | |
462 | ||
463 | static void snd_hwdep_proc_read(snd_info_entry_t *entry, | |
464 | snd_info_buffer_t * buffer) | |
465 | { | |
466 | int idx; | |
467 | snd_hwdep_t *hwdep; | |
468 | ||
469 | down(®ister_mutex); | |
470 | for (idx = 0; idx < SNDRV_CARDS * SNDRV_MINOR_HWDEPS; idx++) { | |
471 | hwdep = snd_hwdep_devices[idx]; | |
472 | if (hwdep == NULL) | |
473 | continue; | |
474 | snd_iprintf(buffer, "%02i-%02i: %s\n", | |
475 | idx / SNDRV_MINOR_HWDEPS, | |
476 | idx % SNDRV_MINOR_HWDEPS, | |
477 | hwdep->name); | |
478 | } | |
479 | up(®ister_mutex); | |
480 | } | |
481 | ||
482 | /* | |
483 | * ENTRY functions | |
484 | */ | |
485 | ||
486 | static snd_info_entry_t *snd_hwdep_proc_entry = NULL; | |
487 | ||
488 | static int __init alsa_hwdep_init(void) | |
489 | { | |
490 | snd_info_entry_t *entry; | |
491 | ||
492 | memset(snd_hwdep_devices, 0, sizeof(snd_hwdep_devices)); | |
493 | if ((entry = snd_info_create_module_entry(THIS_MODULE, "hwdep", NULL)) != NULL) { | |
494 | entry->c.text.read_size = 512; | |
495 | entry->c.text.read = snd_hwdep_proc_read; | |
496 | if (snd_info_register(entry) < 0) { | |
497 | snd_info_free_entry(entry); | |
498 | entry = NULL; | |
499 | } | |
500 | } | |
501 | snd_hwdep_proc_entry = entry; | |
502 | snd_ctl_register_ioctl(snd_hwdep_control_ioctl); | |
503 | snd_ctl_register_ioctl_compat(snd_hwdep_control_ioctl); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static void __exit alsa_hwdep_exit(void) | |
508 | { | |
509 | snd_ctl_unregister_ioctl(snd_hwdep_control_ioctl); | |
510 | snd_ctl_unregister_ioctl_compat(snd_hwdep_control_ioctl); | |
511 | if (snd_hwdep_proc_entry) { | |
512 | snd_info_unregister(snd_hwdep_proc_entry); | |
513 | snd_hwdep_proc_entry = NULL; | |
514 | } | |
515 | } | |
516 | ||
517 | module_init(alsa_hwdep_init) | |
518 | module_exit(alsa_hwdep_exit) | |
519 | ||
520 | EXPORT_SYMBOL(snd_hwdep_new); |