blob: 3e65da21a08c0398f78f5aa32da004dbe08a1c6d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Initialization routines
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/sched.h>
24#include <linux/file.h>
25#include <linux/slab.h>
26#include <linux/time.h>
27#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/pm.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010029
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <sound/core.h>
31#include <sound/control.h>
32#include <sound/info.h>
33
Takashi Iwai82a783f2009-09-07 15:50:18 +020034/* monitor files for graceful shutdown (hotplug) */
35struct snd_monitor_file {
36 struct file *file;
37 const struct file_operations *disconnected_f_op;
38 struct list_head shutdown_list; /* still need to shutdown */
39 struct list_head list; /* link of monitor files */
40};
41
Karsten Wiesea9edfc62006-10-06 16:08:27 +020042static DEFINE_SPINLOCK(shutdown_lock);
43static LIST_HEAD(shutdown_files);
44
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -080045static const struct file_operations snd_shutdown_f_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Takashi Iwai6581f4e2006-05-17 17:14:51 +020047static unsigned int snd_cards_lock; /* locked for registering/using */
48struct snd_card *snd_cards[SNDRV_CARDS];
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020049EXPORT_SYMBOL(snd_cards);
50
Takashi Iwai746df9482006-05-15 19:49:05 +020051static DEFINE_MUTEX(snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Takashi Iwai304cd072007-10-26 15:10:15 +020053static char *slots[SNDRV_CARDS];
54module_param_array(slots, charp, NULL, 0444);
55MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
56
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020057/* return non-zero if the given index is reserved for the given
Takashi Iwai304cd072007-10-26 15:10:15 +020058 * module via slots option
59 */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020060static int module_slot_match(struct module *module, int idx)
Takashi Iwai304cd072007-10-26 15:10:15 +020061{
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020062 int match = 1;
Takashi Iwai304cd072007-10-26 15:10:15 +020063#ifdef MODULE
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020064 const char *s1, *s2;
65
Takashi Iwai304cd072007-10-26 15:10:15 +020066 if (!module || !module->name || !slots[idx])
67 return 0;
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020068
69 s1 = module->name;
70 s2 = slots[idx];
71 if (*s2 == '!') {
72 match = 0; /* negative match */
73 s2++;
74 }
Takashi Iwai304cd072007-10-26 15:10:15 +020075 /* compare module name strings
76 * hyphens are handled as equivalent with underscore
77 */
78 for (;;) {
79 char c1 = *s1++;
80 char c2 = *s2++;
81 if (c1 == '-')
82 c1 = '_';
83 if (c2 == '-')
84 c2 = '_';
85 if (c1 != c2)
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020086 return !match;
Takashi Iwai304cd072007-10-26 15:10:15 +020087 if (!c1)
88 break;
89 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020090#endif /* MODULE */
91 return match;
Takashi Iwai304cd072007-10-26 15:10:15 +020092}
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
Takashi Iwai512bbd62005-11-17 13:51:18 +010095int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020096EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#endif
98
Takashi Iwaie28563c2005-12-01 10:42:42 +010099#ifdef CONFIG_PROC_FS
Takashi Iwai512bbd62005-11-17 13:51:18 +0100100static void snd_card_id_read(struct snd_info_entry *entry,
101 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
103 snd_iprintf(buffer, "%s\n", entry->card->id);
104}
105
Takashi Iwaie28563c2005-12-01 10:42:42 +0100106static inline int init_info_for_card(struct snd_card *card)
107{
108 int err;
109 struct snd_info_entry *entry;
110
111 if ((err = snd_info_card_register(card)) < 0) {
112 snd_printd("unable to create card info\n");
113 return err;
114 }
115 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
116 snd_printd("unable to create card entry\n");
117 return err;
118 }
Takashi Iwaie28563c2005-12-01 10:42:42 +0100119 entry->c.text.read = snd_card_id_read;
120 if (snd_info_register(entry) < 0) {
121 snd_info_free_entry(entry);
122 entry = NULL;
123 }
124 card->proc_id = entry;
125 return 0;
126}
127#else /* !CONFIG_PROC_FS */
128#define init_info_for_card(card)
129#endif
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/**
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100132 * snd_card_create - create and initialize a soundcard structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
134 * @xid: card identification (ASCII string)
135 * @module: top level module for locking
136 * @extra_size: allocate this extra size after the main soundcard structure
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100137 * @card_ret: the pointer to store the created card instance
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 *
139 * Creates and initializes a soundcard structure.
140 *
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100141 * The function allocates snd_card instance via kzalloc with the given
142 * space for the driver to use freely. The allocated struct is stored
143 * in the given card_ret pointer.
144 *
145 * Returns zero if successful or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100147int snd_card_create(int idx, const char *xid,
148 struct module *module, int extra_size,
149 struct snd_card **card_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100151 struct snd_card *card;
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200152 int err, idx2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100154 if (snd_BUG_ON(!card_ret))
155 return -EINVAL;
156 *card_ret = NULL;
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 if (extra_size < 0)
159 extra_size = 0;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200160 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100161 if (!card)
162 return -ENOMEM;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200163 if (xid)
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200164 strlcpy(card->id, xid, sizeof(card->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 err = 0;
Takashi Iwai746df9482006-05-15 19:49:05 +0200166 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 if (idx < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100169 /* idx == -1 == 0xffff means: take any free slot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (~snd_cards_lock & idx & 1<<idx2) {
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200171 if (module_slot_match(module, idx2)) {
172 idx = idx2;
173 break;
174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100176 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200177 if (idx < 0) {
178 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
179 /* idx == -1 == 0xffff means: take any free slot */
180 if (~snd_cards_lock & idx & 1<<idx2) {
181 if (!slots[idx2] || !*slots[idx2]) {
182 idx = idx2;
183 break;
184 }
185 }
186 }
187 if (idx < 0)
188 err = -ENODEV;
189 else if (idx < snd_ecards_limit) {
190 if (snd_cards_lock & (1 << idx))
191 err = -EBUSY; /* invalid */
192 } else if (idx >= SNDRV_CARDS)
193 err = -ENODEV;
194 if (err < 0) {
Takashi Iwai746df9482006-05-15 19:49:05 +0200195 mutex_unlock(&snd_card_mutex);
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100196 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
197 idx, snd_ecards_limit - 1, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 goto __error;
199 }
200 snd_cards_lock |= 1 << idx; /* lock it */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200201 if (idx >= snd_ecards_limit)
202 snd_ecards_limit = idx + 1; /* increase the limit */
Takashi Iwai746df9482006-05-15 19:49:05 +0200203 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 card->number = idx;
205 card->module = module;
206 INIT_LIST_HEAD(&card->devices);
207 init_rwsem(&card->controls_rwsem);
208 rwlock_init(&card->ctl_files_rwlock);
209 INIT_LIST_HEAD(&card->controls);
210 INIT_LIST_HEAD(&card->ctl_files);
211 spin_lock_init(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100212 INIT_LIST_HEAD(&card->files_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 init_waitqueue_head(&card->shutdown_sleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214#ifdef CONFIG_PM
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100215 mutex_init(&card->power_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 init_waitqueue_head(&card->power_sleep);
217#endif
218 /* the control interface cannot be accessed from the user space until */
219 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100220 err = snd_ctl_create(card);
221 if (err < 0) {
222 snd_printk(KERN_ERR "unable to register control minors\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 goto __error;
224 }
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100225 err = snd_info_card_create(card);
226 if (err < 0) {
227 snd_printk(KERN_ERR "unable to create card info\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 goto __error_ctl;
229 }
230 if (extra_size > 0)
Takashi Iwai512bbd62005-11-17 13:51:18 +0100231 card->private_data = (char *)card + sizeof(struct snd_card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100232 *card_ret = card;
233 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 __error_ctl:
236 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
237 __error:
238 kfree(card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100239 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100241EXPORT_SYMBOL(snd_card_create);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200242
Takashi Iwai746df9482006-05-15 19:49:05 +0200243/* return non-zero if a card is already locked */
244int snd_card_locked(int card)
245{
246 int locked;
247
248 mutex_lock(&snd_card_mutex);
249 locked = snd_cards_lock & (1 << card);
250 mutex_unlock(&snd_card_mutex);
251 return locked;
252}
253
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100254static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
255{
256 return -ENODEV;
257}
258
259static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
260 size_t count, loff_t *offset)
261{
262 return -ENODEV;
263}
264
265static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
266 size_t count, loff_t *offset)
267{
268 return -ENODEV;
269}
270
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200271static int snd_disconnect_release(struct inode *inode, struct file *file)
272{
273 struct snd_monitor_file *df = NULL, *_df;
274
275 spin_lock(&shutdown_lock);
276 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
277 if (_df->file == file) {
278 df = _df;
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100279 list_del_init(&df->shutdown_list);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200280 break;
281 }
282 }
283 spin_unlock(&shutdown_lock);
284
Al Viro233e70f2008-10-31 23:28:30 +0000285 if (likely(df)) {
286 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
287 df->disconnected_f_op->fasync(-1, file, 0);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200288 return df->disconnected_f_op->release(inode, file);
Al Viro233e70f2008-10-31 23:28:30 +0000289 }
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200290
Harvey Harrison9bf8e7d2008-03-03 15:32:18 -0800291 panic("%s(%p, %p) failed!", __func__, inode, file);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200292}
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
295{
296 return POLLERR | POLLNVAL;
297}
298
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100299static long snd_disconnect_ioctl(struct file *file,
300 unsigned int cmd, unsigned long arg)
301{
302 return -ENODEV;
303}
304
305static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
306{
307 return -ENODEV;
308}
309
310static int snd_disconnect_fasync(int fd, struct file *file, int on)
311{
312 return -ENODEV;
313}
314
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800315static const struct file_operations snd_shutdown_f_ops =
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200316{
317 .owner = THIS_MODULE,
318 .llseek = snd_disconnect_llseek,
319 .read = snd_disconnect_read,
320 .write = snd_disconnect_write,
321 .release = snd_disconnect_release,
322 .poll = snd_disconnect_poll,
323 .unlocked_ioctl = snd_disconnect_ioctl,
324#ifdef CONFIG_COMPAT
325 .compat_ioctl = snd_disconnect_ioctl,
326#endif
327 .mmap = snd_disconnect_mmap,
328 .fasync = snd_disconnect_fasync
329};
330
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331/**
332 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
333 * @card: soundcard structure
334 *
335 * Disconnects all APIs from the file-operations (user space).
336 *
337 * Returns zero, otherwise a negative error code.
338 *
339 * Note: The current implementation replaces all active file->f_op with special
340 * dummy file operations (they do nothing except release).
341 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100342int snd_card_disconnect(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 struct snd_monitor_file *mfile;
345 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 int err;
347
Takashi Iwaif18638d2008-04-17 12:52:02 +0200348 if (!card)
349 return -EINVAL;
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 spin_lock(&card->files_lock);
352 if (card->shutdown) {
353 spin_unlock(&card->files_lock);
354 return 0;
355 }
356 card->shutdown = 1;
357 spin_unlock(&card->files_lock);
358
359 /* phase 1: disable fops (user space) operations for ALSA API */
Takashi Iwai746df9482006-05-15 19:49:05 +0200360 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 snd_cards[card->number] = NULL;
Takashi Iwaif18638d2008-04-17 12:52:02 +0200362 snd_cards_lock &= ~(1 << card->number);
Takashi Iwai746df9482006-05-15 19:49:05 +0200363 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
365 /* phase 2: replace file->f_op with special dummy operations */
366
367 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100368 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 file = mfile->file;
370
371 /* it's critical part, use endless loop */
372 /* we have no room to fail */
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200373 mfile->disconnected_f_op = mfile->file->f_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200375 spin_lock(&shutdown_lock);
376 list_add(&mfile->shutdown_list, &shutdown_files);
377 spin_unlock(&shutdown_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200379 mfile->file->f_op = &snd_shutdown_f_ops;
Miguel Botonbc9abce2008-01-13 12:03:53 +0100380 fops_get(mfile->file->f_op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382 spin_unlock(&card->files_lock);
383
384 /* phase 3: notify all connected devices about disconnection */
385 /* at this point, they cannot respond to any calls except release() */
386
387#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
388 if (snd_mixer_oss_notify_callback)
389 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
390#endif
391
392 /* notify all devices that we are disconnected */
393 err = snd_device_disconnect_all(card);
394 if (err < 0)
395 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
396
Takashi Iwai746d4a02006-06-23 14:37:59 +0200397 snd_info_card_disconnect(card);
Takashi Iwai73d38b12008-04-17 12:50:47 +0200398 if (card->card_dev) {
399 device_unregister(card->card_dev);
400 card->card_dev = NULL;
401 }
Takashi Iwaif18638d2008-04-17 12:52:02 +0200402#ifdef CONFIG_PM
403 wake_up(&card->power_sleep);
404#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 return 0;
406}
407
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200408EXPORT_SYMBOL(snd_card_disconnect);
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/**
411 * snd_card_free - frees given soundcard structure
412 * @card: soundcard structure
413 *
414 * This function releases the soundcard structure and the all assigned
415 * devices automatically. That is, you don't have to release the devices
416 * by yourself.
417 *
418 * Returns zero. Frees all associated devices and frees the control
419 * interface associated to given soundcard.
420 */
Takashi Iwaic4614822006-06-23 14:38:23 +0200421static int snd_card_do_free(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
424 if (snd_mixer_oss_notify_callback)
425 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
426#endif
427 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
428 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
429 /* Fatal, but this situation should never occur */
430 }
431 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
432 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
433 /* Fatal, but this situation should never occur */
434 }
435 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
436 snd_printk(KERN_ERR "unable to free all devices (post)\n");
437 /* Fatal, but this situation should never occur */
438 }
439 if (card->private_free)
440 card->private_free(card);
Takashi Iwai746d4a02006-06-23 14:37:59 +0200441 snd_info_free_entry(card->proc_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 if (snd_info_card_free(card) < 0) {
443 snd_printk(KERN_WARNING "unable to free card info\n");
444 /* Not fatal error */
445 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200446 kfree(card);
447 return 0;
448}
449
Takashi Iwaic4614822006-06-23 14:38:23 +0200450int snd_card_free_when_closed(struct snd_card *card)
451{
452 int free_now = 0;
Takashi Iwaif18638d2008-04-17 12:52:02 +0200453 int ret = snd_card_disconnect(card);
Takashi Iwaic4614822006-06-23 14:38:23 +0200454 if (ret)
455 return ret;
456
457 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100458 if (list_empty(&card->files_list))
Takashi Iwaic4614822006-06-23 14:38:23 +0200459 free_now = 1;
460 else
461 card->free_on_last_close = 1;
462 spin_unlock(&card->files_lock);
463
464 if (free_now)
465 snd_card_do_free(card);
466 return 0;
467}
468
469EXPORT_SYMBOL(snd_card_free_when_closed);
470
471int snd_card_free(struct snd_card *card)
472{
Takashi Iwaif18638d2008-04-17 12:52:02 +0200473 int ret = snd_card_disconnect(card);
Takashi Iwaic4614822006-06-23 14:38:23 +0200474 if (ret)
475 return ret;
476
477 /* wait, until all devices are ready for the free operation */
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100478 wait_event(card->shutdown_sleep, list_empty(&card->files_list));
Takashi Iwaic4614822006-06-23 14:38:23 +0200479 snd_card_do_free(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 return 0;
481}
482
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200483EXPORT_SYMBOL(snd_card_free);
484
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200485static void snd_card_set_id_no_lock(struct snd_card *card, const char *nid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486{
Clemens Ladischd0015442005-11-20 14:09:05 +0100487 int i, len, idx_flag = 0, loops = SNDRV_CARDS;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200488 const char *spos, *src;
489 char *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200491 if (nid == NULL) {
492 id = card->shortname;
493 spos = src = id;
494 while (*id != '\0') {
495 if (*id == ' ')
496 spos = id + 1;
497 id++;
498 }
499 } else {
500 spos = src = nid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
502 id = card->id;
503 while (*spos != '\0' && !isalnum(*spos))
504 spos++;
505 if (isdigit(*spos))
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200506 *id++ = isalpha(src[0]) ? src[0] : 'D';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) {
508 if (isalnum(*spos))
509 *id++ = *spos;
510 spos++;
511 }
512 *id = '\0';
513
514 id = card->id;
515
516 if (*id == '\0')
517 strcpy(id, "default");
518
519 while (1) {
520 if (loops-- == 0) {
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200521 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 strcpy(card->id, card->proc_root->name);
523 return;
524 }
525 if (!snd_info_check_reserved_words(id))
526 goto __change;
527 for (i = 0; i < snd_ecards_limit; i++) {
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200528 if (snd_cards[i] && !strcmp(snd_cards[i]->id, id))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 goto __change;
530 }
531 break;
532
533 __change:
534 len = strlen(id);
Clemens Ladischd0015442005-11-20 14:09:05 +0100535 if (idx_flag) {
536 if (id[len-1] != '9')
537 id[len-1]++;
538 else
539 id[len-1] = 'A';
540 } else if ((size_t)len <= sizeof(card->id) - 3) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 strcat(id, "_1");
542 idx_flag++;
543 } else {
544 spos = id + len - 2;
545 if ((size_t)len <= sizeof(card->id) - 2)
546 spos++;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200547 *(char *)spos++ = '_';
548 *(char *)spos++ = '1';
549 *(char *)spos++ = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 idx_flag++;
551 }
552 }
553}
554
Mark Brown872c7822009-06-03 20:43:29 +0100555/**
556 * snd_card_set_id - set card identification name
557 * @card: soundcard structure
558 * @nid: new identification string
559 *
560 * This function sets the card identification and checks for name
561 * collisions.
562 */
563void snd_card_set_id(struct snd_card *card, const char *nid)
564{
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200565 /* check if user specified own card->id */
566 if (card->id[0] != '\0')
567 return;
568 mutex_lock(&snd_card_mutex);
569 snd_card_set_id_no_lock(card, nid);
570 mutex_unlock(&snd_card_mutex);
Mark Brown872c7822009-06-03 20:43:29 +0100571}
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200572EXPORT_SYMBOL(snd_card_set_id);
573
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100574static ssize_t
575card_id_show_attr(struct device *dev,
576 struct device_attribute *attr, char *buf)
577{
578 struct snd_card *card = dev_get_drvdata(dev);
579 return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
580}
581
582static ssize_t
583card_id_store_attr(struct device *dev, struct device_attribute *attr,
584 const char *buf, size_t count)
585{
586 struct snd_card *card = dev_get_drvdata(dev);
587 char buf1[sizeof(card->id)];
588 size_t copy = count > sizeof(card->id) - 1 ?
589 sizeof(card->id) - 1 : count;
590 size_t idx;
591 int c;
592
593 for (idx = 0; idx < copy; idx++) {
594 c = buf[idx];
595 if (!isalnum(c) && c != '_' && c != '-')
596 return -EINVAL;
597 }
598 memcpy(buf1, buf, copy);
599 buf1[copy] = '\0';
600 mutex_lock(&snd_card_mutex);
601 if (!snd_info_check_reserved_words(buf1)) {
602 __exist:
603 mutex_unlock(&snd_card_mutex);
604 return -EEXIST;
605 }
606 for (idx = 0; idx < snd_ecards_limit; idx++) {
Peter Ujfalusi4437ecd2010-09-16 10:26:54 +0300607 if (snd_cards[idx] && !strcmp(snd_cards[idx]->id, buf1)) {
608 if (card == snd_cards[idx])
609 goto __ok;
610 else
611 goto __exist;
612 }
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100613 }
614 strcpy(card->id, buf1);
Jaroslav Kyselac2eb9c42008-11-12 16:31:37 +0100615 snd_info_card_id_change(card);
Peter Ujfalusi4437ecd2010-09-16 10:26:54 +0300616__ok:
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100617 mutex_unlock(&snd_card_mutex);
618
619 return count;
620}
621
622static struct device_attribute card_id_attrs =
623 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
624
625static ssize_t
626card_number_show_attr(struct device *dev,
627 struct device_attribute *attr, char *buf)
628{
629 struct snd_card *card = dev_get_drvdata(dev);
630 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
631}
632
633static struct device_attribute card_number_attrs =
634 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636/**
637 * snd_card_register - register the soundcard
638 * @card: soundcard structure
639 *
640 * This function registers all the devices assigned to the soundcard.
641 * Until calling this, the ALSA control interface is blocked from the
642 * external accesses. Thus, you should call this function at the end
643 * of the initialization of the card.
644 *
Uwe Kleine-Königb5950762010-11-01 15:38:34 -0400645 * Returns zero otherwise a negative error code if the registration failed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100647int snd_card_register(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
649 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200651 if (snd_BUG_ON(!card))
652 return -EINVAL;
Kay Sievers39aba962010-09-04 22:33:14 -0700653
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100654 if (!card->card_dev) {
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700655 card->card_dev = device_create(sound_class, card->dev,
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100656 MKDEV(0, 0), card,
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700657 "card%i", card->number);
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100658 if (IS_ERR(card->card_dev))
659 card->card_dev = NULL;
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700660 }
Kay Sievers39aba962010-09-04 22:33:14 -0700661
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 if ((err = snd_device_register_all(card)) < 0)
663 return err;
Takashi Iwai746df9482006-05-15 19:49:05 +0200664 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (snd_cards[card->number]) {
666 /* already registered */
Takashi Iwai746df9482006-05-15 19:49:05 +0200667 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 return 0;
669 }
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200670 snd_card_set_id_no_lock(card, card->id[0] == '\0' ? NULL : card->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 snd_cards[card->number] = card;
Takashi Iwai746df9482006-05-15 19:49:05 +0200672 mutex_unlock(&snd_card_mutex);
Takashi Iwaie28563c2005-12-01 10:42:42 +0100673 init_info_for_card(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
675 if (snd_mixer_oss_notify_callback)
676 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
677#endif
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100678 if (card->card_dev) {
Hannes Eder2af75292008-11-18 12:25:06 -0500679 err = device_create_file(card->card_dev, &card_id_attrs);
680 if (err < 0)
681 return err;
682 err = device_create_file(card->card_dev, &card_number_attrs);
683 if (err < 0)
684 return err;
Jaroslav Kysela9fb6198e2008-11-11 16:51:02 +0100685 }
Kay Sievers39aba962010-09-04 22:33:14 -0700686
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 return 0;
688}
689
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200690EXPORT_SYMBOL(snd_card_register);
691
Takashi Iwaie28563c2005-12-01 10:42:42 +0100692#ifdef CONFIG_PROC_FS
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200693static struct snd_info_entry *snd_card_info_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694
Takashi Iwaia381a7a2005-11-17 15:55:49 +0100695static void snd_card_info_read(struct snd_info_entry *entry,
696 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
698 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100699 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df9482006-05-15 19:49:05 +0200702 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 if ((card = snd_cards[idx]) != NULL) {
704 count++;
Clemens Ladischd0015442005-11-20 14:09:05 +0100705 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 idx,
707 card->id,
708 card->driver,
709 card->shortname);
Clemens Ladischd0015442005-11-20 14:09:05 +0100710 snd_iprintf(buffer, " %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 card->longname);
712 }
Takashi Iwai746df9482006-05-15 19:49:05 +0200713 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 }
715 if (!count)
716 snd_iprintf(buffer, "--- no soundcards ---\n");
717}
718
Takashi Iwaie28563c2005-12-01 10:42:42 +0100719#ifdef CONFIG_SND_OSSEMUL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
Takashi Iwai512bbd62005-11-17 13:51:18 +0100721void snd_card_info_read_oss(struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722{
723 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100724 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df9482006-05-15 19:49:05 +0200727 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 if ((card = snd_cards[idx]) != NULL) {
729 count++;
730 snd_iprintf(buffer, "%s\n", card->longname);
731 }
Takashi Iwai746df9482006-05-15 19:49:05 +0200732 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 }
734 if (!count) {
735 snd_iprintf(buffer, "--- no soundcards ---\n");
736 }
737}
738
739#endif
740
741#ifdef MODULE
Takashi Iwai512bbd62005-11-17 13:51:18 +0100742static struct snd_info_entry *snd_card_module_info_entry;
743static void snd_card_module_info_read(struct snd_info_entry *entry,
744 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745{
746 int idx;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100747 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748
749 for (idx = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df9482006-05-15 19:49:05 +0200750 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 if ((card = snd_cards[idx]) != NULL)
Clemens Ladischd0015442005-11-20 14:09:05 +0100752 snd_iprintf(buffer, "%2i %s\n",
753 idx, card->module->name);
Takashi Iwai746df9482006-05-15 19:49:05 +0200754 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 }
756}
757#endif
758
759int __init snd_card_info_init(void)
760{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100761 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
763 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200764 if (! entry)
765 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 entry->c.text.read = snd_card_info_read;
767 if (snd_info_register(entry) < 0) {
768 snd_info_free_entry(entry);
769 return -ENOMEM;
770 }
771 snd_card_info_entry = entry;
772
773#ifdef MODULE
774 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
775 if (entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 entry->c.text.read = snd_card_module_info_read;
777 if (snd_info_register(entry) < 0)
778 snd_info_free_entry(entry);
779 else
780 snd_card_module_info_entry = entry;
781 }
782#endif
783
784 return 0;
785}
786
787int __exit snd_card_info_done(void)
788{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200789 snd_info_free_entry(snd_card_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790#ifdef MODULE
Takashi Iwai746d4a02006-06-23 14:37:59 +0200791 snd_info_free_entry(snd_card_module_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792#endif
793 return 0;
794}
795
Takashi Iwaie28563c2005-12-01 10:42:42 +0100796#endif /* CONFIG_PROC_FS */
797
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798/**
799 * snd_component_add - add a component string
800 * @card: soundcard structure
801 * @component: the component id string
802 *
803 * This function adds the component id string to the supported list.
804 * The component can be referred from the alsa-lib.
805 *
806 * Returns zero otherwise a negative error code.
807 */
808
Takashi Iwai512bbd62005-11-17 13:51:18 +0100809int snd_component_add(struct snd_card *card, const char *component)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810{
811 char *ptr;
812 int len = strlen(component);
813
814 ptr = strstr(card->components, component);
815 if (ptr != NULL) {
816 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
817 return 1;
818 }
819 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
820 snd_BUG();
821 return -ENOMEM;
822 }
823 if (card->components[0] != '\0')
824 strcat(card->components, " ");
825 strcat(card->components, component);
826 return 0;
827}
828
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200829EXPORT_SYMBOL(snd_component_add);
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831/**
832 * snd_card_file_add - add the file to the file list of the card
833 * @card: soundcard structure
834 * @file: file pointer
835 *
836 * This function adds the file to the file linked-list of the card.
837 * This linked-list is used to keep tracking the connection state,
838 * and to avoid the release of busy resources by hotplug.
839 *
840 * Returns zero or a negative error code.
841 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100842int snd_card_file_add(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843{
844 struct snd_monitor_file *mfile;
845
846 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
847 if (mfile == NULL)
848 return -ENOMEM;
849 mfile->file = file;
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200850 mfile->disconnected_f_op = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 spin_lock(&card->files_lock);
852 if (card->shutdown) {
853 spin_unlock(&card->files_lock);
854 kfree(mfile);
855 return -ENODEV;
856 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100857 list_add(&mfile->list, &card->files_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 spin_unlock(&card->files_lock);
859 return 0;
860}
861
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200862EXPORT_SYMBOL(snd_card_file_add);
863
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864/**
865 * snd_card_file_remove - remove the file from the file list
866 * @card: soundcard structure
867 * @file: file pointer
868 *
869 * This function removes the file formerly added to the card via
870 * snd_card_file_add() function.
Takashi Iwai2b29b132006-06-23 14:38:26 +0200871 * If all files are removed and snd_card_free_when_closed() was
872 * called beforehand, it processes the pending release of
873 * resources.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 *
875 * Returns zero or a negative error code.
876 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100877int snd_card_file_remove(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878{
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100879 struct snd_monitor_file *mfile, *found = NULL;
Takashi Iwaic4614822006-06-23 14:38:23 +0200880 int last_close = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
882 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100883 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 if (mfile->file == file) {
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100885 list_del(&mfile->list);
886 if (mfile->disconnected_f_op)
887 fops_put(mfile->disconnected_f_op);
888 found = mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 break;
890 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100892 if (list_empty(&card->files_list))
Takashi Iwaic4614822006-06-23 14:38:23 +0200893 last_close = 1;
894 spin_unlock(&card->files_lock);
895 if (last_close) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 wake_up(&card->shutdown_sleep);
Takashi Iwaic4614822006-06-23 14:38:23 +0200897 if (card->free_on_last_close)
898 snd_card_do_free(card);
899 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100900 if (!found) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
902 return -ENOENT;
903 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100904 kfree(found);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 return 0;
906}
907
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200908EXPORT_SYMBOL(snd_card_file_remove);
909
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910#ifdef CONFIG_PM
911/**
912 * snd_power_wait - wait until the power-state is changed.
913 * @card: soundcard structure
914 * @power_state: expected power state
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 *
916 * Waits until the power-state is changed.
917 *
918 * Note: the power lock must be active before call.
919 */
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200920int snd_power_wait(struct snd_card *card, unsigned int power_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921{
922 wait_queue_t wait;
923 int result = 0;
924
925 /* fastpath */
926 if (snd_power_get_state(card) == power_state)
927 return 0;
928 init_waitqueue_entry(&wait, current);
929 add_wait_queue(&card->power_sleep, &wait);
930 while (1) {
931 if (card->shutdown) {
932 result = -ENODEV;
933 break;
934 }
935 if (snd_power_get_state(card) == power_state)
936 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 set_current_state(TASK_UNINTERRUPTIBLE);
938 snd_power_unlock(card);
939 schedule_timeout(30 * HZ);
940 snd_power_lock(card);
941 }
942 remove_wait_queue(&card->power_sleep, &wait);
943 return result;
944}
945
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200946EXPORT_SYMBOL(snd_power_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947#endif /* CONFIG_PM */