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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 Iwai7bb24912013-05-15 08:46:39 +020049/* locked for registering/using */
50static DECLARE_BITMAP(snd_cards_lock, SNDRV_CARDS);
Takashi Iwai6581f4e2006-05-17 17:14:51 +020051struct snd_card *snd_cards[SNDRV_CARDS];
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020052EXPORT_SYMBOL(snd_cards);
53
Takashi Iwai746df942006-05-15 19:49:05 +020054static DEFINE_MUTEX(snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Takashi Iwai304cd072007-10-26 15:10:15 +020056static char *slots[SNDRV_CARDS];
57module_param_array(slots, charp, NULL, 0444);
58MODULE_PARM_DESC(slots, "Module names assigned to the slots.");
59
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020060/* return non-zero if the given index is reserved for the given
Takashi Iwai304cd072007-10-26 15:10:15 +020061 * module via slots option
62 */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020063static int module_slot_match(struct module *module, int idx)
Takashi Iwai304cd072007-10-26 15:10:15 +020064{
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020065 int match = 1;
Takashi Iwai304cd072007-10-26 15:10:15 +020066#ifdef MODULE
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020067 const char *s1, *s2;
68
Takashi Iwai60f6fef2013-10-28 12:54:52 +010069 if (!module || !*module->name || !slots[idx])
Takashi Iwai304cd072007-10-26 15:10:15 +020070 return 0;
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020071
72 s1 = module->name;
73 s2 = slots[idx];
74 if (*s2 == '!') {
75 match = 0; /* negative match */
76 s2++;
77 }
Takashi Iwai304cd072007-10-26 15:10:15 +020078 /* compare module name strings
79 * hyphens are handled as equivalent with underscore
80 */
81 for (;;) {
82 char c1 = *s1++;
83 char c2 = *s2++;
84 if (c1 == '-')
85 c1 = '_';
86 if (c2 == '-')
87 c2 = '_';
88 if (c1 != c2)
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020089 return !match;
Takashi Iwai304cd072007-10-26 15:10:15 +020090 if (!c1)
91 break;
92 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +020093#endif /* MODULE */
94 return match;
Takashi Iwai304cd072007-10-26 15:10:15 +020095}
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
Takashi Iwai512bbd62005-11-17 13:51:18 +010098int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020099EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#endif
101
Takashi Iwaie28563c2005-12-01 10:42:42 +0100102#ifdef CONFIG_PROC_FS
Takashi Iwai512bbd62005-11-17 13:51:18 +0100103static void snd_card_id_read(struct snd_info_entry *entry,
104 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 snd_iprintf(buffer, "%s\n", entry->card->id);
107}
108
Takashi Iwaie28563c2005-12-01 10:42:42 +0100109static inline int init_info_for_card(struct snd_card *card)
110{
111 int err;
112 struct snd_info_entry *entry;
113
114 if ((err = snd_info_card_register(card)) < 0) {
115 snd_printd("unable to create card info\n");
116 return err;
117 }
118 if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
119 snd_printd("unable to create card entry\n");
120 return err;
121 }
Takashi Iwaie28563c2005-12-01 10:42:42 +0100122 entry->c.text.read = snd_card_id_read;
123 if (snd_info_register(entry) < 0) {
124 snd_info_free_entry(entry);
125 entry = NULL;
126 }
127 card->proc_id = entry;
128 return 0;
129}
130#else /* !CONFIG_PROC_FS */
131#define init_info_for_card(card)
132#endif
133
Takashi Iwaideb65962014-01-23 11:02:15 +0100134static int check_empty_slot(struct module *module, int slot)
135{
136 return !slots[slot] || !*slots[slot];
137}
138
139/* return an empty slot number (>= 0) found in the given bitmask @mask.
140 * @mask == -1 == 0xffffffff means: take any free slot up to 32
141 * when no slot is available, return the original @mask as is.
142 */
143static int get_slot_from_bitmask(int mask, int (*check)(struct module *, int),
144 struct module *module)
145{
146 int slot;
147
148 for (slot = 0; slot < SNDRV_CARDS; slot++) {
149 if (slot < 32 && !(mask & (1U << slot)))
150 continue;
151 if (!test_bit(slot, snd_cards_lock)) {
152 if (check(module, slot))
153 return slot; /* found */
154 }
155 }
156 return mask; /* unchanged */
157}
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159/**
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100160 * snd_card_create - create and initialize a soundcard structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
162 * @xid: card identification (ASCII string)
163 * @module: top level module for locking
164 * @extra_size: allocate this extra size after the main soundcard structure
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100165 * @card_ret: the pointer to store the created card instance
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 *
167 * Creates and initializes a soundcard structure.
168 *
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100169 * The function allocates snd_card instance via kzalloc with the given
170 * space for the driver to use freely. The allocated struct is stored
171 * in the given card_ret pointer.
172 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100173 * Return: Zero if successful or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100175int snd_card_create(int idx, const char *xid,
176 struct module *module, int extra_size,
177 struct snd_card **card_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100179 struct snd_card *card;
Takashi Iwaideb65962014-01-23 11:02:15 +0100180 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100182 if (snd_BUG_ON(!card_ret))
183 return -EINVAL;
184 *card_ret = NULL;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 if (extra_size < 0)
187 extra_size = 0;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200188 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100189 if (!card)
190 return -ENOMEM;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200191 if (xid)
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200192 strlcpy(card->id, xid, sizeof(card->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 err = 0;
Takashi Iwai746df942006-05-15 19:49:05 +0200194 mutex_lock(&snd_card_mutex);
Takashi Iwaideb65962014-01-23 11:02:15 +0100195 if (idx < 0) /* first check the matching module-name slot */
196 idx = get_slot_from_bitmask(idx, module_slot_match, module);
197 if (idx < 0) /* if not matched, assign an empty slot */
198 idx = get_slot_from_bitmask(idx, check_empty_slot, module);
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200199 if (idx < 0)
200 err = -ENODEV;
201 else if (idx < snd_ecards_limit) {
Takashi Iwai7bb24912013-05-15 08:46:39 +0200202 if (test_bit(idx, snd_cards_lock))
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200203 err = -EBUSY; /* invalid */
204 } else if (idx >= SNDRV_CARDS)
205 err = -ENODEV;
206 if (err < 0) {
Takashi Iwai746df942006-05-15 19:49:05 +0200207 mutex_unlock(&snd_card_mutex);
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100208 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
209 idx, snd_ecards_limit - 1, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 goto __error;
211 }
Takashi Iwai7bb24912013-05-15 08:46:39 +0200212 set_bit(idx, snd_cards_lock); /* lock it */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200213 if (idx >= snd_ecards_limit)
214 snd_ecards_limit = idx + 1; /* increase the limit */
Takashi Iwai746df942006-05-15 19:49:05 +0200215 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 card->number = idx;
217 card->module = module;
218 INIT_LIST_HEAD(&card->devices);
219 init_rwsem(&card->controls_rwsem);
220 rwlock_init(&card->ctl_files_rwlock);
221 INIT_LIST_HEAD(&card->controls);
222 INIT_LIST_HEAD(&card->ctl_files);
223 spin_lock_init(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100224 INIT_LIST_HEAD(&card->files_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 init_waitqueue_head(&card->shutdown_sleep);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200226 atomic_set(&card->refcount, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227#ifdef CONFIG_PM
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100228 mutex_init(&card->power_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 init_waitqueue_head(&card->power_sleep);
230#endif
231 /* the control interface cannot be accessed from the user space until */
232 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100233 err = snd_ctl_create(card);
234 if (err < 0) {
235 snd_printk(KERN_ERR "unable to register control minors\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 goto __error;
237 }
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100238 err = snd_info_card_create(card);
239 if (err < 0) {
240 snd_printk(KERN_ERR "unable to create card info\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 goto __error_ctl;
242 }
243 if (extra_size > 0)
Takashi Iwai512bbd62005-11-17 13:51:18 +0100244 card->private_data = (char *)card + sizeof(struct snd_card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100245 *card_ret = card;
246 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 __error_ctl:
249 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
250 __error:
251 kfree(card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100252 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100254EXPORT_SYMBOL(snd_card_create);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200255
Takashi Iwai746df942006-05-15 19:49:05 +0200256/* return non-zero if a card is already locked */
257int snd_card_locked(int card)
258{
259 int locked;
260
261 mutex_lock(&snd_card_mutex);
Takashi Iwai7bb24912013-05-15 08:46:39 +0200262 locked = test_bit(card, snd_cards_lock);
Takashi Iwai746df942006-05-15 19:49:05 +0200263 mutex_unlock(&snd_card_mutex);
264 return locked;
265}
266
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100267static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
268{
269 return -ENODEV;
270}
271
272static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
273 size_t count, loff_t *offset)
274{
275 return -ENODEV;
276}
277
278static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
279 size_t count, loff_t *offset)
280{
281 return -ENODEV;
282}
283
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200284static int snd_disconnect_release(struct inode *inode, struct file *file)
285{
286 struct snd_monitor_file *df = NULL, *_df;
287
288 spin_lock(&shutdown_lock);
289 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
290 if (_df->file == file) {
291 df = _df;
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100292 list_del_init(&df->shutdown_list);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200293 break;
294 }
295 }
296 spin_unlock(&shutdown_lock);
297
Al Viro233e70f2008-10-31 23:28:30 +0000298 if (likely(df)) {
299 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
300 df->disconnected_f_op->fasync(-1, file, 0);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200301 return df->disconnected_f_op->release(inode, file);
Al Viro233e70f2008-10-31 23:28:30 +0000302 }
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200303
Harvey Harrison9bf8e7d2008-03-03 15:32:18 -0800304 panic("%s(%p, %p) failed!", __func__, inode, file);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200305}
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
308{
309 return POLLERR | POLLNVAL;
310}
311
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100312static long snd_disconnect_ioctl(struct file *file,
313 unsigned int cmd, unsigned long arg)
314{
315 return -ENODEV;
316}
317
318static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
319{
320 return -ENODEV;
321}
322
323static int snd_disconnect_fasync(int fd, struct file *file, int on)
324{
325 return -ENODEV;
326}
327
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800328static const struct file_operations snd_shutdown_f_ops =
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200329{
330 .owner = THIS_MODULE,
331 .llseek = snd_disconnect_llseek,
332 .read = snd_disconnect_read,
333 .write = snd_disconnect_write,
334 .release = snd_disconnect_release,
335 .poll = snd_disconnect_poll,
336 .unlocked_ioctl = snd_disconnect_ioctl,
337#ifdef CONFIG_COMPAT
338 .compat_ioctl = snd_disconnect_ioctl,
339#endif
340 .mmap = snd_disconnect_mmap,
341 .fasync = snd_disconnect_fasync
342};
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344/**
345 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
346 * @card: soundcard structure
347 *
348 * Disconnects all APIs from the file-operations (user space).
349 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100350 * Return: Zero, otherwise a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 *
352 * Note: The current implementation replaces all active file->f_op with special
353 * dummy file operations (they do nothing except release).
354 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100355int snd_card_disconnect(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
357 struct snd_monitor_file *mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 int err;
359
Takashi Iwaif18638d2008-04-17 12:52:02 +0200360 if (!card)
361 return -EINVAL;
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 spin_lock(&card->files_lock);
364 if (card->shutdown) {
365 spin_unlock(&card->files_lock);
366 return 0;
367 }
368 card->shutdown = 1;
369 spin_unlock(&card->files_lock);
370
371 /* phase 1: disable fops (user space) operations for ALSA API */
Takashi Iwai746df942006-05-15 19:49:05 +0200372 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 snd_cards[card->number] = NULL;
Takashi Iwai7bb24912013-05-15 08:46:39 +0200374 clear_bit(card->number, snd_cards_lock);
Takashi Iwai746df942006-05-15 19:49:05 +0200375 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
377 /* phase 2: replace file->f_op with special dummy operations */
378
379 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100380 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 /* it's critical part, use endless loop */
382 /* we have no room to fail */
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200383 mfile->disconnected_f_op = mfile->file->f_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200385 spin_lock(&shutdown_lock);
386 list_add(&mfile->shutdown_list, &shutdown_files);
387 spin_unlock(&shutdown_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200389 mfile->file->f_op = &snd_shutdown_f_ops;
Miguel Botonbc9abce2008-01-13 12:03:53 +0100390 fops_get(mfile->file->f_op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
392 spin_unlock(&card->files_lock);
393
394 /* phase 3: notify all connected devices about disconnection */
395 /* at this point, they cannot respond to any calls except release() */
396
397#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
398 if (snd_mixer_oss_notify_callback)
399 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
400#endif
401
402 /* notify all devices that we are disconnected */
403 err = snd_device_disconnect_all(card);
404 if (err < 0)
405 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
406
Takashi Iwai746d4a02006-06-23 14:37:59 +0200407 snd_info_card_disconnect(card);
Takashi Iwai73d38b12008-04-17 12:50:47 +0200408 if (card->card_dev) {
409 device_unregister(card->card_dev);
410 card->card_dev = NULL;
411 }
Takashi Iwaif18638d2008-04-17 12:52:02 +0200412#ifdef CONFIG_PM
413 wake_up(&card->power_sleep);
414#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 return 0;
416}
417
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200418EXPORT_SYMBOL(snd_card_disconnect);
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420/**
421 * snd_card_free - frees given soundcard structure
422 * @card: soundcard structure
423 *
424 * This function releases the soundcard structure and the all assigned
425 * devices automatically. That is, you don't have to release the devices
426 * by yourself.
427 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100428 * Return: Zero. Frees all associated devices and frees the control
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 * interface associated to given soundcard.
430 */
Takashi Iwaic4614822006-06-23 14:38:23 +0200431static int snd_card_do_free(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
434 if (snd_mixer_oss_notify_callback)
435 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
436#endif
437 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
438 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
439 /* Fatal, but this situation should never occur */
440 }
441 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
442 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
443 /* Fatal, but this situation should never occur */
444 }
445 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
446 snd_printk(KERN_ERR "unable to free all devices (post)\n");
447 /* Fatal, but this situation should never occur */
448 }
449 if (card->private_free)
450 card->private_free(card);
Takashi Iwai746d4a02006-06-23 14:37:59 +0200451 snd_info_free_entry(card->proc_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (snd_info_card_free(card) < 0) {
453 snd_printk(KERN_WARNING "unable to free card info\n");
454 /* Not fatal error */
455 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200456 kfree(card);
457 return 0;
458}
459
Takashi Iwaia0830db2012-10-16 13:05:59 +0200460/**
461 * snd_card_unref - release the reference counter
462 * @card: the card instance
463 *
464 * Decrements the reference counter. When it reaches to zero, wake up
465 * the sleeper and call the destructor if needed.
466 */
467void snd_card_unref(struct snd_card *card)
468{
469 if (atomic_dec_and_test(&card->refcount)) {
470 wake_up(&card->shutdown_sleep);
471 if (card->free_on_last_close)
472 snd_card_do_free(card);
473 }
474}
475EXPORT_SYMBOL(snd_card_unref);
476
Takashi Iwaic4614822006-06-23 14:38:23 +0200477int snd_card_free_when_closed(struct snd_card *card)
478{
Takashi Iwaia0830db2012-10-16 13:05:59 +0200479 int ret;
480
481 atomic_inc(&card->refcount);
482 ret = snd_card_disconnect(card);
483 if (ret) {
484 atomic_dec(&card->refcount);
Takashi Iwaic4614822006-06-23 14:38:23 +0200485 return ret;
Takashi Iwaia0830db2012-10-16 13:05:59 +0200486 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200487
Takashi Iwaia0830db2012-10-16 13:05:59 +0200488 card->free_on_last_close = 1;
489 if (atomic_dec_and_test(&card->refcount))
Takashi Iwaic4614822006-06-23 14:38:23 +0200490 snd_card_do_free(card);
491 return 0;
492}
493
494EXPORT_SYMBOL(snd_card_free_when_closed);
495
496int snd_card_free(struct snd_card *card)
497{
Takashi Iwaif18638d2008-04-17 12:52:02 +0200498 int ret = snd_card_disconnect(card);
Takashi Iwaic4614822006-06-23 14:38:23 +0200499 if (ret)
500 return ret;
501
502 /* wait, until all devices are ready for the free operation */
Takashi Iwaia0830db2012-10-16 13:05:59 +0200503 wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
Takashi Iwaic4614822006-06-23 14:38:23 +0200504 snd_card_do_free(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 return 0;
506}
507
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200508EXPORT_SYMBOL(snd_card_free);
509
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100510/* retrieve the last word of shortname or longname */
511static const char *retrieve_id_from_card_name(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512{
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100513 const char *spos = name;
514
515 while (*name) {
516 if (isspace(*name) && isalnum(name[1]))
517 spos = name + 1;
518 name++;
519 }
520 return spos;
521}
522
523/* return true if the given id string doesn't conflict any other card ids */
524static bool card_id_ok(struct snd_card *card, const char *id)
525{
526 int i;
527 if (!snd_info_check_reserved_words(id))
528 return false;
529 for (i = 0; i < snd_ecards_limit; i++) {
530 if (snd_cards[i] && snd_cards[i] != card &&
531 !strcmp(snd_cards[i]->id, id))
532 return false;
533 }
534 return true;
535}
536
537/* copy to card->id only with valid letters from nid */
538static void copy_valid_id_string(struct snd_card *card, const char *src,
539 const char *nid)
540{
541 char *id = card->id;
542
543 while (*nid && !isalnum(*nid))
544 nid++;
545 if (isdigit(*nid))
546 *id++ = isalpha(*src) ? *src : 'D';
547 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
548 if (isalnum(*nid))
549 *id++ = *nid;
550 nid++;
551 }
552 *id = 0;
553}
554
555/* Set card->id from the given string
556 * If the string conflicts with other ids, add a suffix to make it unique.
557 */
558static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
559 const char *nid)
560{
561 int len, loops;
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100562 bool is_default = false;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200563 char *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100565 copy_valid_id_string(card, src, nid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 id = card->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100568 again:
569 /* use "Default" for obviously invalid strings
570 * ("card" conflicts with proc directories)
571 */
572 if (!*id || !strncmp(id, "card", 4)) {
Takashi Iwaid8e4f9a2011-04-04 12:43:23 +0200573 strcpy(id, "Default");
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100574 is_default = true;
575 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Takashi Iwai8edbb192013-05-24 16:30:39 +0200577 len = strlen(id);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100578 for (loops = 0; loops < SNDRV_CARDS; loops++) {
Takashi Iwai8edbb192013-05-24 16:30:39 +0200579 char *spos;
580 char sfxstr[5]; /* "_012" */
581 int sfxlen;
582
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100583 if (card_id_ok(card, id))
584 return; /* OK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Takashi Iwai8edbb192013-05-24 16:30:39 +0200586 /* Add _XYZ suffix */
587 sprintf(sfxstr, "_%X", loops + 1);
588 sfxlen = strlen(sfxstr);
589 if (len + sfxlen >= sizeof(card->id))
590 spos = id + sizeof(card->id) - sfxlen - 1;
591 else
592 spos = id + len;
593 strcpy(spos, sfxstr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 }
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100595 /* fallback to the default id */
596 if (!is_default) {
597 *id = 0;
598 goto again;
599 }
600 /* last resort... */
601 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
602 if (card->proc_root->name)
Takashi Iwai97f44f52013-10-29 15:20:06 +0100603 strlcpy(card->id, card->proc_root->name, sizeof(card->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604}
605
Mark Brown872c7822009-06-03 20:43:29 +0100606/**
607 * snd_card_set_id - set card identification name
608 * @card: soundcard structure
609 * @nid: new identification string
610 *
611 * This function sets the card identification and checks for name
612 * collisions.
613 */
614void snd_card_set_id(struct snd_card *card, const char *nid)
615{
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200616 /* check if user specified own card->id */
617 if (card->id[0] != '\0')
618 return;
619 mutex_lock(&snd_card_mutex);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100620 snd_card_set_id_no_lock(card, nid, nid);
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200621 mutex_unlock(&snd_card_mutex);
Mark Brown872c7822009-06-03 20:43:29 +0100622}
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200623EXPORT_SYMBOL(snd_card_set_id);
624
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100625static ssize_t
626card_id_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, "%s\n", card ? card->id : "(null)");
631}
632
633static ssize_t
634card_id_store_attr(struct device *dev, struct device_attribute *attr,
635 const char *buf, size_t count)
636{
637 struct snd_card *card = dev_get_drvdata(dev);
638 char buf1[sizeof(card->id)];
639 size_t copy = count > sizeof(card->id) - 1 ?
640 sizeof(card->id) - 1 : count;
641 size_t idx;
642 int c;
643
644 for (idx = 0; idx < copy; idx++) {
645 c = buf[idx];
646 if (!isalnum(c) && c != '_' && c != '-')
647 return -EINVAL;
648 }
649 memcpy(buf1, buf, copy);
650 buf1[copy] = '\0';
651 mutex_lock(&snd_card_mutex);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100652 if (!card_id_ok(NULL, buf1)) {
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100653 mutex_unlock(&snd_card_mutex);
654 return -EEXIST;
655 }
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100656 strcpy(card->id, buf1);
Jaroslav Kyselac2eb9c42008-11-12 16:31:37 +0100657 snd_info_card_id_change(card);
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100658 mutex_unlock(&snd_card_mutex);
659
660 return count;
661}
662
663static struct device_attribute card_id_attrs =
664 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
665
666static ssize_t
667card_number_show_attr(struct device *dev,
668 struct device_attribute *attr, char *buf)
669{
670 struct snd_card *card = dev_get_drvdata(dev);
671 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
672}
673
674static struct device_attribute card_number_attrs =
675 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677/**
678 * snd_card_register - register the soundcard
679 * @card: soundcard structure
680 *
681 * This function registers all the devices assigned to the soundcard.
682 * Until calling this, the ALSA control interface is blocked from the
683 * external accesses. Thus, you should call this function at the end
684 * of the initialization of the card.
685 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100686 * Return: Zero otherwise a negative error code if the registration failed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100688int snd_card_register(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689{
690 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200692 if (snd_BUG_ON(!card))
693 return -EINVAL;
Kay Sievers39aba962010-09-04 22:33:14 -0700694
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100695 if (!card->card_dev) {
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700696 card->card_dev = device_create(sound_class, card->dev,
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100697 MKDEV(0, 0), card,
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700698 "card%i", card->number);
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100699 if (IS_ERR(card->card_dev))
700 card->card_dev = NULL;
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700701 }
Kay Sievers39aba962010-09-04 22:33:14 -0700702
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 if ((err = snd_device_register_all(card)) < 0)
704 return err;
Takashi Iwai746df942006-05-15 19:49:05 +0200705 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 if (snd_cards[card->number]) {
707 /* already registered */
Takashi Iwai746df942006-05-15 19:49:05 +0200708 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 return 0;
710 }
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100711 if (*card->id) {
712 /* make a unique id name from the given string */
713 char tmpid[sizeof(card->id)];
714 memcpy(tmpid, card->id, sizeof(card->id));
715 snd_card_set_id_no_lock(card, tmpid, tmpid);
716 } else {
717 /* create an id from either shortname or longname */
718 const char *src;
719 src = *card->shortname ? card->shortname : card->longname;
720 snd_card_set_id_no_lock(card, src,
721 retrieve_id_from_card_name(src));
722 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 snd_cards[card->number] = card;
Takashi Iwai746df942006-05-15 19:49:05 +0200724 mutex_unlock(&snd_card_mutex);
Takashi Iwaie28563c2005-12-01 10:42:42 +0100725 init_info_for_card(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
727 if (snd_mixer_oss_notify_callback)
728 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
729#endif
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100730 if (card->card_dev) {
Hannes Eder2af75292008-11-18 12:25:06 -0500731 err = device_create_file(card->card_dev, &card_id_attrs);
732 if (err < 0)
733 return err;
734 err = device_create_file(card->card_dev, &card_number_attrs);
735 if (err < 0)
736 return err;
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100737 }
Kay Sievers39aba962010-09-04 22:33:14 -0700738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 return 0;
740}
741
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200742EXPORT_SYMBOL(snd_card_register);
743
Takashi Iwaie28563c2005-12-01 10:42:42 +0100744#ifdef CONFIG_PROC_FS
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200745static struct snd_info_entry *snd_card_info_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Takashi Iwaia381a7a2005-11-17 15:55:49 +0100747static void snd_card_info_read(struct snd_info_entry *entry,
748 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
750 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100751 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
753 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200754 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 if ((card = snd_cards[idx]) != NULL) {
756 count++;
Clemens Ladischd0015442005-11-20 14:09:05 +0100757 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 idx,
759 card->id,
760 card->driver,
761 card->shortname);
Clemens Ladischd0015442005-11-20 14:09:05 +0100762 snd_iprintf(buffer, " %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 card->longname);
764 }
Takashi Iwai746df942006-05-15 19:49:05 +0200765 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
767 if (!count)
768 snd_iprintf(buffer, "--- no soundcards ---\n");
769}
770
Takashi Iwaie28563c2005-12-01 10:42:42 +0100771#ifdef CONFIG_SND_OSSEMUL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Takashi Iwai512bbd62005-11-17 13:51:18 +0100773void snd_card_info_read_oss(struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
775 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100776 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200779 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 if ((card = snd_cards[idx]) != NULL) {
781 count++;
782 snd_iprintf(buffer, "%s\n", card->longname);
783 }
Takashi Iwai746df942006-05-15 19:49:05 +0200784 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 }
786 if (!count) {
787 snd_iprintf(buffer, "--- no soundcards ---\n");
788 }
789}
790
791#endif
792
793#ifdef MODULE
Takashi Iwai512bbd62005-11-17 13:51:18 +0100794static struct snd_info_entry *snd_card_module_info_entry;
795static void snd_card_module_info_read(struct snd_info_entry *entry,
796 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797{
798 int idx;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100799 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801 for (idx = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200802 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 if ((card = snd_cards[idx]) != NULL)
Clemens Ladischd0015442005-11-20 14:09:05 +0100804 snd_iprintf(buffer, "%2i %s\n",
805 idx, card->module->name);
Takashi Iwai746df942006-05-15 19:49:05 +0200806 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
808}
809#endif
810
811int __init snd_card_info_init(void)
812{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100813 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
815 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200816 if (! entry)
817 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 entry->c.text.read = snd_card_info_read;
819 if (snd_info_register(entry) < 0) {
820 snd_info_free_entry(entry);
821 return -ENOMEM;
822 }
823 snd_card_info_entry = entry;
824
825#ifdef MODULE
826 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
827 if (entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 entry->c.text.read = snd_card_module_info_read;
829 if (snd_info_register(entry) < 0)
830 snd_info_free_entry(entry);
831 else
832 snd_card_module_info_entry = entry;
833 }
834#endif
835
836 return 0;
837}
838
839int __exit snd_card_info_done(void)
840{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200841 snd_info_free_entry(snd_card_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842#ifdef MODULE
Takashi Iwai746d4a02006-06-23 14:37:59 +0200843 snd_info_free_entry(snd_card_module_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844#endif
845 return 0;
846}
847
Takashi Iwaie28563c2005-12-01 10:42:42 +0100848#endif /* CONFIG_PROC_FS */
849
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850/**
851 * snd_component_add - add a component string
852 * @card: soundcard structure
853 * @component: the component id string
854 *
855 * This function adds the component id string to the supported list.
856 * The component can be referred from the alsa-lib.
857 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100858 * Return: Zero otherwise a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 */
860
Takashi Iwai512bbd62005-11-17 13:51:18 +0100861int snd_component_add(struct snd_card *card, const char *component)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862{
863 char *ptr;
864 int len = strlen(component);
865
866 ptr = strstr(card->components, component);
867 if (ptr != NULL) {
868 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
869 return 1;
870 }
871 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
872 snd_BUG();
873 return -ENOMEM;
874 }
875 if (card->components[0] != '\0')
876 strcat(card->components, " ");
877 strcat(card->components, component);
878 return 0;
879}
880
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200881EXPORT_SYMBOL(snd_component_add);
882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883/**
884 * snd_card_file_add - add the file to the file list of the card
885 * @card: soundcard structure
886 * @file: file pointer
887 *
888 * This function adds the file to the file linked-list of the card.
889 * This linked-list is used to keep tracking the connection state,
890 * and to avoid the release of busy resources by hotplug.
891 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100892 * Return: zero or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100894int snd_card_file_add(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895{
896 struct snd_monitor_file *mfile;
897
898 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
899 if (mfile == NULL)
900 return -ENOMEM;
901 mfile->file = file;
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200902 mfile->disconnected_f_op = NULL;
Takashi Iwaia45e3d62011-03-24 09:50:15 +0100903 INIT_LIST_HEAD(&mfile->shutdown_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 spin_lock(&card->files_lock);
905 if (card->shutdown) {
906 spin_unlock(&card->files_lock);
907 kfree(mfile);
908 return -ENODEV;
909 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100910 list_add(&mfile->list, &card->files_list);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200911 atomic_inc(&card->refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 spin_unlock(&card->files_lock);
913 return 0;
914}
915
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200916EXPORT_SYMBOL(snd_card_file_add);
917
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918/**
919 * snd_card_file_remove - remove the file from the file list
920 * @card: soundcard structure
921 * @file: file pointer
922 *
923 * This function removes the file formerly added to the card via
924 * snd_card_file_add() function.
Takashi Iwai2b29b132006-06-23 14:38:26 +0200925 * If all files are removed and snd_card_free_when_closed() was
926 * called beforehand, it processes the pending release of
927 * resources.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100929 * Return: Zero or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100931int snd_card_file_remove(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100933 struct snd_monitor_file *mfile, *found = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934
935 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100936 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 if (mfile->file == file) {
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100938 list_del(&mfile->list);
Takashi Iwaia45e3d62011-03-24 09:50:15 +0100939 spin_lock(&shutdown_lock);
940 list_del(&mfile->shutdown_list);
941 spin_unlock(&shutdown_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100942 if (mfile->disconnected_f_op)
943 fops_put(mfile->disconnected_f_op);
944 found = mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 break;
946 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200948 spin_unlock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100949 if (!found) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
951 return -ENOENT;
952 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100953 kfree(found);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200954 snd_card_unref(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 return 0;
956}
957
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200958EXPORT_SYMBOL(snd_card_file_remove);
959
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960#ifdef CONFIG_PM
961/**
962 * snd_power_wait - wait until the power-state is changed.
963 * @card: soundcard structure
964 * @power_state: expected power state
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 *
966 * Waits until the power-state is changed.
967 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100968 * Return: Zero if successful, or a negative error code.
969 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 * Note: the power lock must be active before call.
971 */
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200972int snd_power_wait(struct snd_card *card, unsigned int power_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
974 wait_queue_t wait;
975 int result = 0;
976
977 /* fastpath */
978 if (snd_power_get_state(card) == power_state)
979 return 0;
980 init_waitqueue_entry(&wait, current);
981 add_wait_queue(&card->power_sleep, &wait);
982 while (1) {
983 if (card->shutdown) {
984 result = -ENODEV;
985 break;
986 }
987 if (snd_power_get_state(card) == power_state)
988 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 set_current_state(TASK_UNINTERRUPTIBLE);
990 snd_power_unlock(card);
991 schedule_timeout(30 * HZ);
992 snd_power_lock(card);
993 }
994 remove_wait_queue(&card->power_sleep, &wait);
995 return result;
996}
997
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200998EXPORT_SYMBOL(snd_power_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999#endif /* CONFIG_PM */