blob: 6ef06400dfc83884f2feaf6ddd26529498bae8c3 [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>
Paul Gortmakerda155d52011-07-15 12:38:28 -040024#include <linux/module.h>
Paul Gortmaker51990e82012-01-22 11:23:42 -050025#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/file.h>
27#include <linux/slab.h>
28#include <linux/time.h>
29#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/pm.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <sound/core.h>
33#include <sound/control.h>
34#include <sound/info.h>
35
Takashi Iwai82a783f2009-09-07 15:50:18 +020036/* monitor files for graceful shutdown (hotplug) */
37struct snd_monitor_file {
38 struct file *file;
39 const struct file_operations *disconnected_f_op;
40 struct list_head shutdown_list; /* still need to shutdown */
41 struct list_head list; /* link of monitor files */
42};
43
Karsten Wiesea9edfc62006-10-06 16:08:27 +020044static DEFINE_SPINLOCK(shutdown_lock);
45static LIST_HEAD(shutdown_files);
46
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -080047static const struct file_operations snd_shutdown_f_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Takashi Iwai6581f4e2006-05-17 17:14:51 +020049static unsigned int snd_cards_lock; /* locked for registering/using */
50struct snd_card *snd_cards[SNDRV_CARDS];
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020051EXPORT_SYMBOL(snd_cards);
52
Takashi Iwai746df942006-05-15 19:49:05 +020053static DEFINE_MUTEX(snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Takashi Iwai304cd072007-10-26 15:10:15 +020055static char *slots[SNDRV_CARDS];
56module_param_array(slots, charp, NULL, 0444);
57MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
58
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020059/* return non-zero if the given index is reserved for the given
Takashi Iwai304cd072007-10-26 15:10:15 +020060 * module via slots option
61 */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020062static int module_slot_match(struct module *module, int idx)
Takashi Iwai304cd072007-10-26 15:10:15 +020063{
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020064 int match = 1;
Takashi Iwai304cd072007-10-26 15:10:15 +020065#ifdef MODULE
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020066 const char *s1, *s2;
67
Takashi Iwai304cd072007-10-26 15:10:15 +020068 if (!module || !module->name || !slots[idx])
69 return 0;
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020070
71 s1 = module->name;
72 s2 = slots[idx];
73 if (*s2 == '!') {
74 match = 0; /* negative match */
75 s2++;
76 }
Takashi Iwai304cd072007-10-26 15:10:15 +020077 /* compare module name strings
78 * hyphens are handled as equivalent with underscore
79 */
80 for (;;) {
81 char c1 = *s1++;
82 char c2 = *s2++;
83 if (c1 == '-')
84 c1 = '_';
85 if (c2 == '-')
86 c2 = '_';
87 if (c1 != c2)
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020088 return !match;
Takashi Iwai304cd072007-10-26 15:10:15 +020089 if (!c1)
90 break;
91 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020092#endif /* MODULE */
93 return match;
Takashi Iwai304cd072007-10-26 15:10:15 +020094}
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
Takashi Iwai512bbd62005-11-17 13:51:18 +010097int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020098EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#endif
100
Takashi Iwaie28563c2005-12-01 10:42:42 +0100101#ifdef CONFIG_PROC_FS
Takashi Iwai512bbd62005-11-17 13:51:18 +0100102static void snd_card_id_read(struct snd_info_entry *entry,
103 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 snd_iprintf(buffer, "%s\n", entry->card->id);
106}
107
Takashi Iwaie28563c2005-12-01 10:42:42 +0100108static inline int init_info_for_card(struct snd_card *card)
109{
110 int err;
111 struct snd_info_entry *entry;
112
113 if ((err = snd_info_card_register(card)) < 0) {
114 snd_printd("unable to create card info\n");
115 return err;
116 }
117 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
118 snd_printd("unable to create card entry\n");
119 return err;
120 }
Takashi Iwaie28563c2005-12-01 10:42:42 +0100121 entry->c.text.read = snd_card_id_read;
122 if (snd_info_register(entry) < 0) {
123 snd_info_free_entry(entry);
124 entry = NULL;
125 }
126 card->proc_id = entry;
127 return 0;
128}
129#else /* !CONFIG_PROC_FS */
130#define init_info_for_card(card)
131#endif
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133/**
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100134 * snd_card_create - create and initialize a soundcard structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
136 * @xid: card identification (ASCII string)
137 * @module: top level module for locking
138 * @extra_size: allocate this extra size after the main soundcard structure
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100139 * @card_ret: the pointer to store the created card instance
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 *
141 * Creates and initializes a soundcard structure.
142 *
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100143 * The function allocates snd_card instance via kzalloc with the given
144 * space for the driver to use freely. The allocated struct is stored
145 * in the given card_ret pointer.
146 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100147 * Return: Zero if successful or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100149int snd_card_create(int idx, const char *xid,
150 struct module *module, int extra_size,
151 struct snd_card **card_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100153 struct snd_card *card;
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200154 int err, idx2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100156 if (snd_BUG_ON(!card_ret))
157 return -EINVAL;
158 *card_ret = NULL;
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (extra_size < 0)
161 extra_size = 0;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200162 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100163 if (!card)
164 return -ENOMEM;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200165 if (xid)
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200166 strlcpy(card->id, xid, sizeof(card->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 err = 0;
Takashi Iwai746df942006-05-15 19:49:05 +0200168 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (idx < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100171 /* idx == -1 == 0xffff means: take any free slot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (~snd_cards_lock & idx & 1<<idx2) {
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200173 if (module_slot_match(module, idx2)) {
174 idx = idx2;
175 break;
176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100178 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200179 if (idx < 0) {
180 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
181 /* idx == -1 == 0xffff means: take any free slot */
182 if (~snd_cards_lock & idx & 1<<idx2) {
183 if (!slots[idx2] || !*slots[idx2]) {
184 idx = idx2;
185 break;
186 }
187 }
188 }
189 if (idx < 0)
190 err = -ENODEV;
191 else if (idx < snd_ecards_limit) {
192 if (snd_cards_lock & (1 << idx))
193 err = -EBUSY; /* invalid */
194 } else if (idx >= SNDRV_CARDS)
195 err = -ENODEV;
196 if (err < 0) {
Takashi Iwai746df942006-05-15 19:49:05 +0200197 mutex_unlock(&snd_card_mutex);
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100198 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
199 idx, snd_ecards_limit - 1, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 goto __error;
201 }
202 snd_cards_lock |= 1 << idx; /* lock it */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200203 if (idx >= snd_ecards_limit)
204 snd_ecards_limit = idx + 1; /* increase the limit */
Takashi Iwai746df942006-05-15 19:49:05 +0200205 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 card->number = idx;
207 card->module = module;
208 INIT_LIST_HEAD(&card->devices);
209 init_rwsem(&card->controls_rwsem);
210 rwlock_init(&card->ctl_files_rwlock);
211 INIT_LIST_HEAD(&card->controls);
212 INIT_LIST_HEAD(&card->ctl_files);
213 spin_lock_init(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100214 INIT_LIST_HEAD(&card->files_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 init_waitqueue_head(&card->shutdown_sleep);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200216 atomic_set(&card->refcount, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217#ifdef CONFIG_PM
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100218 mutex_init(&card->power_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 init_waitqueue_head(&card->power_sleep);
220#endif
221 /* the control interface cannot be accessed from the user space until */
222 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100223 err = snd_ctl_create(card);
224 if (err < 0) {
225 snd_printk(KERN_ERR "unable to register control minors\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 goto __error;
227 }
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100228 err = snd_info_card_create(card);
229 if (err < 0) {
230 snd_printk(KERN_ERR "unable to create card info\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 goto __error_ctl;
232 }
233 if (extra_size > 0)
Takashi Iwai512bbd62005-11-17 13:51:18 +0100234 card->private_data = (char *)card + sizeof(struct snd_card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100235 *card_ret = card;
236 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238 __error_ctl:
239 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
240 __error:
241 kfree(card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100242 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100244EXPORT_SYMBOL(snd_card_create);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200245
Takashi Iwai746df942006-05-15 19:49:05 +0200246/* return non-zero if a card is already locked */
247int snd_card_locked(int card)
248{
249 int locked;
250
251 mutex_lock(&snd_card_mutex);
252 locked = snd_cards_lock & (1 << card);
253 mutex_unlock(&snd_card_mutex);
254 return locked;
255}
256
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100257static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
258{
259 return -ENODEV;
260}
261
262static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
263 size_t count, loff_t *offset)
264{
265 return -ENODEV;
266}
267
268static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
269 size_t count, loff_t *offset)
270{
271 return -ENODEV;
272}
273
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200274static int snd_disconnect_release(struct inode *inode, struct file *file)
275{
276 struct snd_monitor_file *df = NULL, *_df;
277
278 spin_lock(&shutdown_lock);
279 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
280 if (_df->file == file) {
281 df = _df;
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100282 list_del_init(&df->shutdown_list);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200283 break;
284 }
285 }
286 spin_unlock(&shutdown_lock);
287
Al Viro233e70f2008-10-31 23:28:30 +0000288 if (likely(df)) {
289 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
290 df->disconnected_f_op->fasync(-1, file, 0);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200291 return df->disconnected_f_op->release(inode, file);
Al Viro233e70f2008-10-31 23:28:30 +0000292 }
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200293
Harvey Harrison9bf8e7d2008-03-03 15:32:18 -0800294 panic("%s(%p, %p) failed!", __func__, inode, file);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200295}
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
298{
299 return POLLERR | POLLNVAL;
300}
301
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100302static long snd_disconnect_ioctl(struct file *file,
303 unsigned int cmd, unsigned long arg)
304{
305 return -ENODEV;
306}
307
308static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
309{
310 return -ENODEV;
311}
312
313static int snd_disconnect_fasync(int fd, struct file *file, int on)
314{
315 return -ENODEV;
316}
317
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800318static const struct file_operations snd_shutdown_f_ops =
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200319{
320 .owner = THIS_MODULE,
321 .llseek = snd_disconnect_llseek,
322 .read = snd_disconnect_read,
323 .write = snd_disconnect_write,
324 .release = snd_disconnect_release,
325 .poll = snd_disconnect_poll,
326 .unlocked_ioctl = snd_disconnect_ioctl,
327#ifdef CONFIG_COMPAT
328 .compat_ioctl = snd_disconnect_ioctl,
329#endif
330 .mmap = snd_disconnect_mmap,
331 .fasync = snd_disconnect_fasync
332};
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334/**
335 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
336 * @card: soundcard structure
337 *
338 * Disconnects all APIs from the file-operations (user space).
339 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100340 * Return: Zero, otherwise a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 *
342 * Note: The current implementation replaces all active file->f_op with special
343 * dummy file operations (they do nothing except release).
344 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100345int snd_card_disconnect(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
347 struct snd_monitor_file *mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 int err;
349
Takashi Iwaif18638d2008-04-17 12:52:02 +0200350 if (!card)
351 return -EINVAL;
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 spin_lock(&card->files_lock);
354 if (card->shutdown) {
355 spin_unlock(&card->files_lock);
356 return 0;
357 }
358 card->shutdown = 1;
359 spin_unlock(&card->files_lock);
360
361 /* phase 1: disable fops (user space) operations for ALSA API */
Takashi Iwai746df942006-05-15 19:49:05 +0200362 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 snd_cards[card->number] = NULL;
Takashi Iwaif18638d2008-04-17 12:52:02 +0200364 snd_cards_lock &= ~(1 << card->number);
Takashi Iwai746df942006-05-15 19:49:05 +0200365 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 /* phase 2: replace file->f_op with special dummy operations */
368
369 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100370 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 /* 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 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100418 * Return: Zero. Frees all associated devices and frees the control
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 * 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 Iwaia0830db2012-10-16 13:05:59 +0200450/**
451 * snd_card_unref - release the reference counter
452 * @card: the card instance
453 *
454 * Decrements the reference counter. When it reaches to zero, wake up
455 * the sleeper and call the destructor if needed.
456 */
457void snd_card_unref(struct snd_card *card)
458{
459 if (atomic_dec_and_test(&card->refcount)) {
460 wake_up(&card->shutdown_sleep);
461 if (card->free_on_last_close)
462 snd_card_do_free(card);
463 }
464}
465EXPORT_SYMBOL(snd_card_unref);
466
Takashi Iwaic4614822006-06-23 14:38:23 +0200467int snd_card_free_when_closed(struct snd_card *card)
468{
Takashi Iwaia0830db2012-10-16 13:05:59 +0200469 int ret;
470
471 atomic_inc(&card->refcount);
472 ret = snd_card_disconnect(card);
473 if (ret) {
474 atomic_dec(&card->refcount);
Takashi Iwaic4614822006-06-23 14:38:23 +0200475 return ret;
Takashi Iwaia0830db2012-10-16 13:05:59 +0200476 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200477
Takashi Iwaia0830db2012-10-16 13:05:59 +0200478 card->free_on_last_close = 1;
479 if (atomic_dec_and_test(&card->refcount))
Takashi Iwaic4614822006-06-23 14:38:23 +0200480 snd_card_do_free(card);
481 return 0;
482}
483
484EXPORT_SYMBOL(snd_card_free_when_closed);
485
486int snd_card_free(struct snd_card *card)
487{
Takashi Iwaif18638d2008-04-17 12:52:02 +0200488 int ret = snd_card_disconnect(card);
Takashi Iwaic4614822006-06-23 14:38:23 +0200489 if (ret)
490 return ret;
491
492 /* wait, until all devices are ready for the free operation */
Takashi Iwaia0830db2012-10-16 13:05:59 +0200493 wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
Takashi Iwaic4614822006-06-23 14:38:23 +0200494 snd_card_do_free(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 return 0;
496}
497
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200498EXPORT_SYMBOL(snd_card_free);
499
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100500/* retrieve the last word of shortname or longname */
501static const char *retrieve_id_from_card_name(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100503 const char *spos = name;
504
505 while (*name) {
506 if (isspace(*name) && isalnum(name[1]))
507 spos = name + 1;
508 name++;
509 }
510 return spos;
511}
512
513/* return true if the given id string doesn't conflict any other card ids */
514static bool card_id_ok(struct snd_card *card, const char *id)
515{
516 int i;
517 if (!snd_info_check_reserved_words(id))
518 return false;
519 for (i = 0; i < snd_ecards_limit; i++) {
520 if (snd_cards[i] && snd_cards[i] != card &&
521 !strcmp(snd_cards[i]->id, id))
522 return false;
523 }
524 return true;
525}
526
527/* copy to card->id only with valid letters from nid */
528static void copy_valid_id_string(struct snd_card *card, const char *src,
529 const char *nid)
530{
531 char *id = card->id;
532
533 while (*nid && !isalnum(*nid))
534 nid++;
535 if (isdigit(*nid))
536 *id++ = isalpha(*src) ? *src : 'D';
537 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
538 if (isalnum(*nid))
539 *id++ = *nid;
540 nid++;
541 }
542 *id = 0;
543}
544
545/* Set card->id from the given string
546 * If the string conflicts with other ids, add a suffix to make it unique.
547 */
548static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
549 const char *nid)
550{
551 int len, loops;
552 bool with_suffix;
553 bool is_default = false;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200554 char *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100556 copy_valid_id_string(card, src, nid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 id = card->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100559 again:
560 /* use "Default" for obviously invalid strings
561 * ("card" conflicts with proc directories)
562 */
563 if (!*id || !strncmp(id, "card", 4)) {
Takashi Iwaid8e4f9a2011-04-04 12:43:23 +0200564 strcpy(id, "Default");
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100565 is_default = true;
566 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100568 with_suffix = false;
569 for (loops = 0; loops < SNDRV_CARDS; loops++) {
570 if (card_id_ok(card, id))
571 return; /* OK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 len = strlen(id);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100574 if (!with_suffix) {
575 /* add the "_X" suffix */
576 char *spos = id + len;
577 if (len > sizeof(card->id) - 3)
578 spos = id + sizeof(card->id) - 3;
579 strcpy(spos, "_1");
580 with_suffix = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 } else {
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100582 /* modify the existing suffix */
583 if (id[len - 1] != '9')
584 id[len - 1]++;
585 else
586 id[len - 1] = 'A';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 }
588 }
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100589 /* fallback to the default id */
590 if (!is_default) {
591 *id = 0;
592 goto again;
593 }
594 /* last resort... */
595 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
596 if (card->proc_root->name)
597 strcpy(card->id, card->proc_root->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
Mark Brown872c7822009-06-03 20:43:29 +0100600/**
601 * snd_card_set_id - set card identification name
602 * @card: soundcard structure
603 * @nid: new identification string
604 *
605 * This function sets the card identification and checks for name
606 * collisions.
607 */
608void snd_card_set_id(struct snd_card *card, const char *nid)
609{
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200610 /* check if user specified own card->id */
611 if (card->id[0] != '\0')
612 return;
613 mutex_lock(&snd_card_mutex);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100614 snd_card_set_id_no_lock(card, nid, nid);
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200615 mutex_unlock(&snd_card_mutex);
Mark Brown872c7822009-06-03 20:43:29 +0100616}
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200617EXPORT_SYMBOL(snd_card_set_id);
618
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100619static ssize_t
620card_id_show_attr(struct device *dev,
621 struct device_attribute *attr, char *buf)
622{
623 struct snd_card *card = dev_get_drvdata(dev);
624 return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
625}
626
627static ssize_t
628card_id_store_attr(struct device *dev, struct device_attribute *attr,
629 const char *buf, size_t count)
630{
631 struct snd_card *card = dev_get_drvdata(dev);
632 char buf1[sizeof(card->id)];
633 size_t copy = count > sizeof(card->id) - 1 ?
634 sizeof(card->id) - 1 : count;
635 size_t idx;
636 int c;
637
638 for (idx = 0; idx < copy; idx++) {
639 c = buf[idx];
640 if (!isalnum(c) && c != '_' && c != '-')
641 return -EINVAL;
642 }
643 memcpy(buf1, buf, copy);
644 buf1[copy] = '\0';
645 mutex_lock(&snd_card_mutex);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100646 if (!card_id_ok(NULL, buf1)) {
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100647 mutex_unlock(&snd_card_mutex);
648 return -EEXIST;
649 }
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100650 strcpy(card->id, buf1);
Jaroslav Kyselac2eb9c42008-11-12 16:31:37 +0100651 snd_info_card_id_change(card);
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100652 mutex_unlock(&snd_card_mutex);
653
654 return count;
655}
656
657static struct device_attribute card_id_attrs =
658 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
659
660static ssize_t
661card_number_show_attr(struct device *dev,
662 struct device_attribute *attr, char *buf)
663{
664 struct snd_card *card = dev_get_drvdata(dev);
665 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
666}
667
668static struct device_attribute card_number_attrs =
669 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671/**
672 * snd_card_register - register the soundcard
673 * @card: soundcard structure
674 *
675 * This function registers all the devices assigned to the soundcard.
676 * Until calling this, the ALSA control interface is blocked from the
677 * external accesses. Thus, you should call this function at the end
678 * of the initialization of the card.
679 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100680 * Return: Zero otherwise a negative error code if the registration failed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100682int snd_card_register(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683{
684 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200686 if (snd_BUG_ON(!card))
687 return -EINVAL;
Kay Sievers39aba962010-09-04 22:33:14 -0700688
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100689 if (!card->card_dev) {
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700690 card->card_dev = device_create(sound_class, card->dev,
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100691 MKDEV(0, 0), card,
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700692 "card%i", card->number);
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100693 if (IS_ERR(card->card_dev))
694 card->card_dev = NULL;
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700695 }
Kay Sievers39aba962010-09-04 22:33:14 -0700696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 if ((err = snd_device_register_all(card)) < 0)
698 return err;
Takashi Iwai746df942006-05-15 19:49:05 +0200699 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if (snd_cards[card->number]) {
701 /* already registered */
Takashi Iwai746df942006-05-15 19:49:05 +0200702 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 return 0;
704 }
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100705 if (*card->id) {
706 /* make a unique id name from the given string */
707 char tmpid[sizeof(card->id)];
708 memcpy(tmpid, card->id, sizeof(card->id));
709 snd_card_set_id_no_lock(card, tmpid, tmpid);
710 } else {
711 /* create an id from either shortname or longname */
712 const char *src;
713 src = *card->shortname ? card->shortname : card->longname;
714 snd_card_set_id_no_lock(card, src,
715 retrieve_id_from_card_name(src));
716 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 snd_cards[card->number] = card;
Takashi Iwai746df942006-05-15 19:49:05 +0200718 mutex_unlock(&snd_card_mutex);
Takashi Iwaie28563c2005-12-01 10:42:42 +0100719 init_info_for_card(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
721 if (snd_mixer_oss_notify_callback)
722 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
723#endif
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100724 if (card->card_dev) {
Hannes Eder2af75292008-11-18 12:25:06 -0500725 err = device_create_file(card->card_dev, &card_id_attrs);
726 if (err < 0)
727 return err;
728 err = device_create_file(card->card_dev, &card_number_attrs);
729 if (err < 0)
730 return err;
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100731 }
Kay Sievers39aba962010-09-04 22:33:14 -0700732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 return 0;
734}
735
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200736EXPORT_SYMBOL(snd_card_register);
737
Takashi Iwaie28563c2005-12-01 10:42:42 +0100738#ifdef CONFIG_PROC_FS
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200739static struct snd_info_entry *snd_card_info_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Takashi Iwaia381a7a2005-11-17 15:55:49 +0100741static void snd_card_info_read(struct snd_info_entry *entry,
742 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743{
744 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100745 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
747 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200748 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if ((card = snd_cards[idx]) != NULL) {
750 count++;
Clemens Ladischd0015442005-11-20 14:09:05 +0100751 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 idx,
753 card->id,
754 card->driver,
755 card->shortname);
Clemens Ladischd0015442005-11-20 14:09:05 +0100756 snd_iprintf(buffer, " %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 card->longname);
758 }
Takashi Iwai746df942006-05-15 19:49:05 +0200759 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 }
761 if (!count)
762 snd_iprintf(buffer, "--- no soundcards ---\n");
763}
764
Takashi Iwaie28563c2005-12-01 10:42:42 +0100765#ifdef CONFIG_SND_OSSEMUL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Takashi Iwai512bbd62005-11-17 13:51:18 +0100767void snd_card_info_read_oss(struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
769 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100770 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200773 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if ((card = snd_cards[idx]) != NULL) {
775 count++;
776 snd_iprintf(buffer, "%s\n", card->longname);
777 }
Takashi Iwai746df942006-05-15 19:49:05 +0200778 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
780 if (!count) {
781 snd_iprintf(buffer, "--- no soundcards ---\n");
782 }
783}
784
785#endif
786
787#ifdef MODULE
Takashi Iwai512bbd62005-11-17 13:51:18 +0100788static struct snd_info_entry *snd_card_module_info_entry;
789static void snd_card_module_info_read(struct snd_info_entry *entry,
790 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
792 int idx;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100793 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 for (idx = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200796 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if ((card = snd_cards[idx]) != NULL)
Clemens Ladischd0015442005-11-20 14:09:05 +0100798 snd_iprintf(buffer, "%2i %s\n",
799 idx, card->module->name);
Takashi Iwai746df942006-05-15 19:49:05 +0200800 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 }
802}
803#endif
804
805int __init snd_card_info_init(void)
806{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100807 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200810 if (! entry)
811 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 entry->c.text.read = snd_card_info_read;
813 if (snd_info_register(entry) < 0) {
814 snd_info_free_entry(entry);
815 return -ENOMEM;
816 }
817 snd_card_info_entry = entry;
818
819#ifdef MODULE
820 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
821 if (entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 entry->c.text.read = snd_card_module_info_read;
823 if (snd_info_register(entry) < 0)
824 snd_info_free_entry(entry);
825 else
826 snd_card_module_info_entry = entry;
827 }
828#endif
829
830 return 0;
831}
832
833int __exit snd_card_info_done(void)
834{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200835 snd_info_free_entry(snd_card_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836#ifdef MODULE
Takashi Iwai746d4a02006-06-23 14:37:59 +0200837 snd_info_free_entry(snd_card_module_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838#endif
839 return 0;
840}
841
Takashi Iwaie28563c2005-12-01 10:42:42 +0100842#endif /* CONFIG_PROC_FS */
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844/**
845 * snd_component_add - add a component string
846 * @card: soundcard structure
847 * @component: the component id string
848 *
849 * This function adds the component id string to the supported list.
850 * The component can be referred from the alsa-lib.
851 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100852 * Return: Zero otherwise a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 */
854
Takashi Iwai512bbd62005-11-17 13:51:18 +0100855int snd_component_add(struct snd_card *card, const char *component)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
857 char *ptr;
858 int len = strlen(component);
859
860 ptr = strstr(card->components, component);
861 if (ptr != NULL) {
862 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
863 return 1;
864 }
865 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
866 snd_BUG();
867 return -ENOMEM;
868 }
869 if (card->components[0] != '\0')
870 strcat(card->components, " ");
871 strcat(card->components, component);
872 return 0;
873}
874
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200875EXPORT_SYMBOL(snd_component_add);
876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877/**
878 * snd_card_file_add - add the file to the file list of the card
879 * @card: soundcard structure
880 * @file: file pointer
881 *
882 * This function adds the file to the file linked-list of the card.
883 * This linked-list is used to keep tracking the connection state,
884 * and to avoid the release of busy resources by hotplug.
885 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100886 * Return: zero or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100888int snd_card_file_add(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889{
890 struct snd_monitor_file *mfile;
891
892 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
893 if (mfile == NULL)
894 return -ENOMEM;
895 mfile->file = file;
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200896 mfile->disconnected_f_op = NULL;
Takashi Iwaia45e3d62011-03-24 09:50:15 +0100897 INIT_LIST_HEAD(&mfile->shutdown_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 spin_lock(&card->files_lock);
899 if (card->shutdown) {
900 spin_unlock(&card->files_lock);
901 kfree(mfile);
902 return -ENODEV;
903 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100904 list_add(&mfile->list, &card->files_list);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200905 atomic_inc(&card->refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 spin_unlock(&card->files_lock);
907 return 0;
908}
909
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200910EXPORT_SYMBOL(snd_card_file_add);
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912/**
913 * snd_card_file_remove - remove the file from the file list
914 * @card: soundcard structure
915 * @file: file pointer
916 *
917 * This function removes the file formerly added to the card via
918 * snd_card_file_add() function.
Takashi Iwai2b29b132006-06-23 14:38:26 +0200919 * If all files are removed and snd_card_free_when_closed() was
920 * called beforehand, it processes the pending release of
921 * resources.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100923 * Return: Zero or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100925int snd_card_file_remove(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100927 struct snd_monitor_file *mfile, *found = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100930 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 if (mfile->file == file) {
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100932 list_del(&mfile->list);
Takashi Iwaia45e3d62011-03-24 09:50:15 +0100933 spin_lock(&shutdown_lock);
934 list_del(&mfile->shutdown_list);
935 spin_unlock(&shutdown_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100936 if (mfile->disconnected_f_op)
937 fops_put(mfile->disconnected_f_op);
938 found = mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 break;
940 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200942 spin_unlock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100943 if (!found) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
945 return -ENOENT;
946 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100947 kfree(found);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200948 snd_card_unref(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 return 0;
950}
951
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200952EXPORT_SYMBOL(snd_card_file_remove);
953
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954#ifdef CONFIG_PM
955/**
956 * snd_power_wait - wait until the power-state is changed.
957 * @card: soundcard structure
958 * @power_state: expected power state
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 *
960 * Waits until the power-state is changed.
961 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100962 * Return: Zero if successful, or a negative error code.
963 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 * Note: the power lock must be active before call.
965 */
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200966int snd_power_wait(struct snd_card *card, unsigned int power_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967{
968 wait_queue_t wait;
969 int result = 0;
970
971 /* fastpath */
972 if (snd_power_get_state(card) == power_state)
973 return 0;
974 init_waitqueue_entry(&wait, current);
975 add_wait_queue(&card->power_sleep, &wait);
976 while (1) {
977 if (card->shutdown) {
978 result = -ENODEV;
979 break;
980 }
981 if (snd_power_get_state(card) == power_state)
982 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 set_current_state(TASK_UNINTERRUPTIBLE);
984 snd_power_unlock(card);
985 schedule_timeout(30 * HZ);
986 snd_power_lock(card);
987 }
988 remove_wait_queue(&card->power_sleep, &wait);
989 return result;
990}
991
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200992EXPORT_SYMBOL(snd_power_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993#endif /* CONFIG_PM */