blob: 6b9087115da24806e8aba244127ac8ec3a4e93f8 [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 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 Iwai304cd072007-10-26 15:10:15 +020069 if (!module || !module->name || !slots[idx])
70 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134/**
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100135 * snd_card_create - create and initialize a soundcard structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
137 * @xid: card identification (ASCII string)
138 * @module: top level module for locking
139 * @extra_size: allocate this extra size after the main soundcard structure
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100140 * @card_ret: the pointer to store the created card instance
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 *
142 * Creates and initializes a soundcard structure.
143 *
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100144 * The function allocates snd_card instance via kzalloc with the given
145 * space for the driver to use freely. The allocated struct is stored
146 * in the given card_ret pointer.
147 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100148 * Return: Zero if successful or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100150int snd_card_create(int idx, const char *xid,
151 struct module *module, int extra_size,
152 struct snd_card **card_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100154 struct snd_card *card;
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200155 int err, idx2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100157 if (snd_BUG_ON(!card_ret))
158 return -EINVAL;
159 *card_ret = NULL;
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (extra_size < 0)
162 extra_size = 0;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200163 card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100164 if (!card)
165 return -ENOMEM;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200166 if (xid)
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200167 strlcpy(card->id, xid, sizeof(card->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 err = 0;
Takashi Iwai746df942006-05-15 19:49:05 +0200169 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (idx < 0) {
Takashi Iwai7bb24912013-05-15 08:46:39 +0200171 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) {
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100172 /* idx == -1 == 0xffff means: take any free slot */
Takashi Iwai7bb24912013-05-15 08:46:39 +0200173 if (idx2 < sizeof(int) && !(idx & (1U << idx2)))
174 continue;
175 if (!test_bit(idx2, snd_cards_lock)) {
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200176 if (module_slot_match(module, idx2)) {
177 idx = idx2;
178 break;
179 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
Takashi Iwai7bb24912013-05-15 08:46:39 +0200181 }
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100182 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200183 if (idx < 0) {
Takashi Iwai7bb24912013-05-15 08:46:39 +0200184 for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) {
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200185 /* idx == -1 == 0xffff means: take any free slot */
Takashi Iwai7bb24912013-05-15 08:46:39 +0200186 if (idx2 < sizeof(int) && !(idx & (1U << idx2)))
187 continue;
188 if (!test_bit(idx2, snd_cards_lock)) {
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200189 if (!slots[idx2] || !*slots[idx2]) {
190 idx = idx2;
191 break;
192 }
193 }
Takashi Iwai7bb24912013-05-15 08:46:39 +0200194 }
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200195 }
196 if (idx < 0)
197 err = -ENODEV;
198 else if (idx < snd_ecards_limit) {
Takashi Iwai7bb24912013-05-15 08:46:39 +0200199 if (test_bit(idx, snd_cards_lock))
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200200 err = -EBUSY; /* invalid */
201 } else if (idx >= SNDRV_CARDS)
202 err = -ENODEV;
203 if (err < 0) {
Takashi Iwai746df942006-05-15 19:49:05 +0200204 mutex_unlock(&snd_card_mutex);
Oliver Neukum5c33dd72007-01-16 17:49:21 +0100205 snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
206 idx, snd_ecards_limit - 1, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 goto __error;
208 }
Takashi Iwai7bb24912013-05-15 08:46:39 +0200209 set_bit(idx, snd_cards_lock); /* lock it */
Takashi Iwaia93bbaa2008-05-27 17:59:24 +0200210 if (idx >= snd_ecards_limit)
211 snd_ecards_limit = idx + 1; /* increase the limit */
Takashi Iwai746df942006-05-15 19:49:05 +0200212 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 card->number = idx;
214 card->module = module;
215 INIT_LIST_HEAD(&card->devices);
216 init_rwsem(&card->controls_rwsem);
217 rwlock_init(&card->ctl_files_rwlock);
218 INIT_LIST_HEAD(&card->controls);
219 INIT_LIST_HEAD(&card->ctl_files);
220 spin_lock_init(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100221 INIT_LIST_HEAD(&card->files_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 init_waitqueue_head(&card->shutdown_sleep);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200223 atomic_set(&card->refcount, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224#ifdef CONFIG_PM
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100225 mutex_init(&card->power_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 init_waitqueue_head(&card->power_sleep);
227#endif
228 /* the control interface cannot be accessed from the user space until */
229 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100230 err = snd_ctl_create(card);
231 if (err < 0) {
232 snd_printk(KERN_ERR "unable to register control minors\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 goto __error;
234 }
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100235 err = snd_info_card_create(card);
236 if (err < 0) {
237 snd_printk(KERN_ERR "unable to create card info\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 goto __error_ctl;
239 }
240 if (extra_size > 0)
Takashi Iwai512bbd62005-11-17 13:51:18 +0100241 card->private_data = (char *)card + sizeof(struct snd_card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100242 *card_ret = card;
243 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 __error_ctl:
246 snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
247 __error:
248 kfree(card);
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100249 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
Takashi Iwai53fb1e62008-12-28 16:32:08 +0100251EXPORT_SYMBOL(snd_card_create);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200252
Takashi Iwai746df942006-05-15 19:49:05 +0200253/* return non-zero if a card is already locked */
254int snd_card_locked(int card)
255{
256 int locked;
257
258 mutex_lock(&snd_card_mutex);
Takashi Iwai7bb24912013-05-15 08:46:39 +0200259 locked = test_bit(card, snd_cards_lock);
Takashi Iwai746df942006-05-15 19:49:05 +0200260 mutex_unlock(&snd_card_mutex);
261 return locked;
262}
263
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100264static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
265{
266 return -ENODEV;
267}
268
269static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
270 size_t count, loff_t *offset)
271{
272 return -ENODEV;
273}
274
275static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
276 size_t count, loff_t *offset)
277{
278 return -ENODEV;
279}
280
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200281static int snd_disconnect_release(struct inode *inode, struct file *file)
282{
283 struct snd_monitor_file *df = NULL, *_df;
284
285 spin_lock(&shutdown_lock);
286 list_for_each_entry(_df, &shutdown_files, shutdown_list) {
287 if (_df->file == file) {
288 df = _df;
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100289 list_del_init(&df->shutdown_list);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200290 break;
291 }
292 }
293 spin_unlock(&shutdown_lock);
294
Al Viro233e70f2008-10-31 23:28:30 +0000295 if (likely(df)) {
296 if ((file->f_flags & FASYNC) && df->disconnected_f_op->fasync)
297 df->disconnected_f_op->fasync(-1, file, 0);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200298 return df->disconnected_f_op->release(inode, file);
Al Viro233e70f2008-10-31 23:28:30 +0000299 }
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200300
Harvey Harrison9bf8e7d2008-03-03 15:32:18 -0800301 panic("%s(%p, %p) failed!", __func__, inode, file);
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200302}
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
305{
306 return POLLERR | POLLNVAL;
307}
308
Clemens Ladischb3b0abe2006-03-03 14:08:43 +0100309static long snd_disconnect_ioctl(struct file *file,
310 unsigned int cmd, unsigned long arg)
311{
312 return -ENODEV;
313}
314
315static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
316{
317 return -ENODEV;
318}
319
320static int snd_disconnect_fasync(int fd, struct file *file, int on)
321{
322 return -ENODEV;
323}
324
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800325static const struct file_operations snd_shutdown_f_ops =
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200326{
327 .owner = THIS_MODULE,
328 .llseek = snd_disconnect_llseek,
329 .read = snd_disconnect_read,
330 .write = snd_disconnect_write,
331 .release = snd_disconnect_release,
332 .poll = snd_disconnect_poll,
333 .unlocked_ioctl = snd_disconnect_ioctl,
334#ifdef CONFIG_COMPAT
335 .compat_ioctl = snd_disconnect_ioctl,
336#endif
337 .mmap = snd_disconnect_mmap,
338 .fasync = snd_disconnect_fasync
339};
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341/**
342 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
343 * @card: soundcard structure
344 *
345 * Disconnects all APIs from the file-operations (user space).
346 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100347 * Return: Zero, otherwise a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 *
349 * Note: The current implementation replaces all active file->f_op with special
350 * dummy file operations (they do nothing except release).
351 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100352int snd_card_disconnect(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
354 struct snd_monitor_file *mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 int err;
356
Takashi Iwaif18638d2008-04-17 12:52:02 +0200357 if (!card)
358 return -EINVAL;
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 spin_lock(&card->files_lock);
361 if (card->shutdown) {
362 spin_unlock(&card->files_lock);
363 return 0;
364 }
365 card->shutdown = 1;
366 spin_unlock(&card->files_lock);
367
368 /* phase 1: disable fops (user space) operations for ALSA API */
Takashi Iwai746df942006-05-15 19:49:05 +0200369 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 snd_cards[card->number] = NULL;
Takashi Iwai7bb24912013-05-15 08:46:39 +0200371 clear_bit(card->number, snd_cards_lock);
Takashi Iwai746df942006-05-15 19:49:05 +0200372 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374 /* phase 2: replace file->f_op with special dummy operations */
375
376 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100377 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 /* it's critical part, use endless loop */
379 /* we have no room to fail */
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200380 mfile->disconnected_f_op = mfile->file->f_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200382 spin_lock(&shutdown_lock);
383 list_add(&mfile->shutdown_list, &shutdown_files);
384 spin_unlock(&shutdown_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200386 mfile->file->f_op = &snd_shutdown_f_ops;
Miguel Botonbc9abce2008-01-13 12:03:53 +0100387 fops_get(mfile->file->f_op);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389 spin_unlock(&card->files_lock);
390
391 /* phase 3: notify all connected devices about disconnection */
392 /* at this point, they cannot respond to any calls except release() */
393
394#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
395 if (snd_mixer_oss_notify_callback)
396 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
397#endif
398
399 /* notify all devices that we are disconnected */
400 err = snd_device_disconnect_all(card);
401 if (err < 0)
402 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
403
Takashi Iwai746d4a02006-06-23 14:37:59 +0200404 snd_info_card_disconnect(card);
Takashi Iwai73d38b12008-04-17 12:50:47 +0200405 if (card->card_dev) {
406 device_unregister(card->card_dev);
407 card->card_dev = NULL;
408 }
Takashi Iwaif18638d2008-04-17 12:52:02 +0200409#ifdef CONFIG_PM
410 wake_up(&card->power_sleep);
411#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return 0;
413}
414
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200415EXPORT_SYMBOL(snd_card_disconnect);
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417/**
418 * snd_card_free - frees given soundcard structure
419 * @card: soundcard structure
420 *
421 * This function releases the soundcard structure and the all assigned
422 * devices automatically. That is, you don't have to release the devices
423 * by yourself.
424 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100425 * Return: Zero. Frees all associated devices and frees the control
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 * interface associated to given soundcard.
427 */
Takashi Iwaic4614822006-06-23 14:38:23 +0200428static int snd_card_do_free(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
431 if (snd_mixer_oss_notify_callback)
432 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
433#endif
434 if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
435 snd_printk(KERN_ERR "unable to free all devices (pre)\n");
436 /* Fatal, but this situation should never occur */
437 }
438 if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
439 snd_printk(KERN_ERR "unable to free all devices (normal)\n");
440 /* Fatal, but this situation should never occur */
441 }
442 if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
443 snd_printk(KERN_ERR "unable to free all devices (post)\n");
444 /* Fatal, but this situation should never occur */
445 }
446 if (card->private_free)
447 card->private_free(card);
Takashi Iwai746d4a02006-06-23 14:37:59 +0200448 snd_info_free_entry(card->proc_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (snd_info_card_free(card) < 0) {
450 snd_printk(KERN_WARNING "unable to free card info\n");
451 /* Not fatal error */
452 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200453 kfree(card);
454 return 0;
455}
456
Takashi Iwaia0830db2012-10-16 13:05:59 +0200457/**
458 * snd_card_unref - release the reference counter
459 * @card: the card instance
460 *
461 * Decrements the reference counter. When it reaches to zero, wake up
462 * the sleeper and call the destructor if needed.
463 */
464void snd_card_unref(struct snd_card *card)
465{
466 if (atomic_dec_and_test(&card->refcount)) {
467 wake_up(&card->shutdown_sleep);
468 if (card->free_on_last_close)
469 snd_card_do_free(card);
470 }
471}
472EXPORT_SYMBOL(snd_card_unref);
473
Takashi Iwaic4614822006-06-23 14:38:23 +0200474int snd_card_free_when_closed(struct snd_card *card)
475{
Takashi Iwaia0830db2012-10-16 13:05:59 +0200476 int ret;
477
478 atomic_inc(&card->refcount);
479 ret = snd_card_disconnect(card);
480 if (ret) {
481 atomic_dec(&card->refcount);
Takashi Iwaic4614822006-06-23 14:38:23 +0200482 return ret;
Takashi Iwaia0830db2012-10-16 13:05:59 +0200483 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200484
Takashi Iwaia0830db2012-10-16 13:05:59 +0200485 card->free_on_last_close = 1;
486 if (atomic_dec_and_test(&card->refcount))
Takashi Iwaic4614822006-06-23 14:38:23 +0200487 snd_card_do_free(card);
488 return 0;
489}
490
491EXPORT_SYMBOL(snd_card_free_when_closed);
492
493int snd_card_free(struct snd_card *card)
494{
Takashi Iwaif18638d2008-04-17 12:52:02 +0200495 int ret = snd_card_disconnect(card);
Takashi Iwaic4614822006-06-23 14:38:23 +0200496 if (ret)
497 return ret;
498
499 /* wait, until all devices are ready for the free operation */
Takashi Iwaia0830db2012-10-16 13:05:59 +0200500 wait_event(card->shutdown_sleep, !atomic_read(&card->refcount));
Takashi Iwaic4614822006-06-23 14:38:23 +0200501 snd_card_do_free(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 return 0;
503}
504
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200505EXPORT_SYMBOL(snd_card_free);
506
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100507/* retrieve the last word of shortname or longname */
508static const char *retrieve_id_from_card_name(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100510 const char *spos = name;
511
512 while (*name) {
513 if (isspace(*name) && isalnum(name[1]))
514 spos = name + 1;
515 name++;
516 }
517 return spos;
518}
519
520/* return true if the given id string doesn't conflict any other card ids */
521static bool card_id_ok(struct snd_card *card, const char *id)
522{
523 int i;
524 if (!snd_info_check_reserved_words(id))
525 return false;
526 for (i = 0; i < snd_ecards_limit; i++) {
527 if (snd_cards[i] && snd_cards[i] != card &&
528 !strcmp(snd_cards[i]->id, id))
529 return false;
530 }
531 return true;
532}
533
534/* copy to card->id only with valid letters from nid */
535static void copy_valid_id_string(struct snd_card *card, const char *src,
536 const char *nid)
537{
538 char *id = card->id;
539
540 while (*nid && !isalnum(*nid))
541 nid++;
542 if (isdigit(*nid))
543 *id++ = isalpha(*src) ? *src : 'D';
544 while (*nid && (size_t)(id - card->id) < sizeof(card->id) - 1) {
545 if (isalnum(*nid))
546 *id++ = *nid;
547 nid++;
548 }
549 *id = 0;
550}
551
552/* Set card->id from the given string
553 * If the string conflicts with other ids, add a suffix to make it unique.
554 */
555static void snd_card_set_id_no_lock(struct snd_card *card, const char *src,
556 const char *nid)
557{
558 int len, loops;
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100559 bool is_default = false;
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200560 char *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100562 copy_valid_id_string(card, src, nid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 id = card->id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100565 again:
566 /* use "Default" for obviously invalid strings
567 * ("card" conflicts with proc directories)
568 */
569 if (!*id || !strncmp(id, "card", 4)) {
Takashi Iwaid8e4f9a2011-04-04 12:43:23 +0200570 strcpy(id, "Default");
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100571 is_default = true;
572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Takashi Iwai8edbb192013-05-24 16:30:39 +0200574 len = strlen(id);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100575 for (loops = 0; loops < SNDRV_CARDS; loops++) {
Takashi Iwai8edbb192013-05-24 16:30:39 +0200576 char *spos;
577 char sfxstr[5]; /* "_012" */
578 int sfxlen;
579
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100580 if (card_id_ok(card, id))
581 return; /* OK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Takashi Iwai8edbb192013-05-24 16:30:39 +0200583 /* Add _XYZ suffix */
584 sprintf(sfxstr, "_%X", loops + 1);
585 sfxlen = strlen(sfxstr);
586 if (len + sfxlen >= sizeof(card->id))
587 spos = id + sizeof(card->id) - sfxlen - 1;
588 else
589 spos = id + len;
590 strcpy(spos, sfxstr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 }
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100592 /* fallback to the default id */
593 if (!is_default) {
594 *id = 0;
595 goto again;
596 }
597 /* last resort... */
598 snd_printk(KERN_ERR "unable to set card id (%s)\n", id);
599 if (card->proc_root->name)
600 strcpy(card->id, card->proc_root->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
Mark Brown872c7822009-06-03 20:43:29 +0100603/**
604 * snd_card_set_id - set card identification name
605 * @card: soundcard structure
606 * @nid: new identification string
607 *
608 * This function sets the card identification and checks for name
609 * collisions.
610 */
611void snd_card_set_id(struct snd_card *card, const char *nid)
612{
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200613 /* check if user specified own card->id */
614 if (card->id[0] != '\0')
615 return;
616 mutex_lock(&snd_card_mutex);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100617 snd_card_set_id_no_lock(card, nid, nid);
Jaroslav Kysela5fdc18d2009-06-04 00:12:18 +0200618 mutex_unlock(&snd_card_mutex);
Mark Brown872c7822009-06-03 20:43:29 +0100619}
Jaroslav Kysela10a8ebb2009-06-02 12:02:38 +0200620EXPORT_SYMBOL(snd_card_set_id);
621
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100622static ssize_t
623card_id_show_attr(struct device *dev,
624 struct device_attribute *attr, char *buf)
625{
626 struct snd_card *card = dev_get_drvdata(dev);
627 return snprintf(buf, PAGE_SIZE, "%s\n", card ? card->id : "(null)");
628}
629
630static ssize_t
631card_id_store_attr(struct device *dev, struct device_attribute *attr,
632 const char *buf, size_t count)
633{
634 struct snd_card *card = dev_get_drvdata(dev);
635 char buf1[sizeof(card->id)];
636 size_t copy = count > sizeof(card->id) - 1 ?
637 sizeof(card->id) - 1 : count;
638 size_t idx;
639 int c;
640
641 for (idx = 0; idx < copy; idx++) {
642 c = buf[idx];
643 if (!isalnum(c) && c != '_' && c != '-')
644 return -EINVAL;
645 }
646 memcpy(buf1, buf, copy);
647 buf1[copy] = '\0';
648 mutex_lock(&snd_card_mutex);
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100649 if (!card_id_ok(NULL, buf1)) {
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100650 mutex_unlock(&snd_card_mutex);
651 return -EEXIST;
652 }
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100653 strcpy(card->id, buf1);
Jaroslav Kyselac2eb9c42008-11-12 16:31:37 +0100654 snd_info_card_id_change(card);
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100655 mutex_unlock(&snd_card_mutex);
656
657 return count;
658}
659
660static struct device_attribute card_id_attrs =
661 __ATTR(id, S_IRUGO | S_IWUSR, card_id_show_attr, card_id_store_attr);
662
663static ssize_t
664card_number_show_attr(struct device *dev,
665 struct device_attribute *attr, char *buf)
666{
667 struct snd_card *card = dev_get_drvdata(dev);
668 return snprintf(buf, PAGE_SIZE, "%i\n", card ? card->number : -1);
669}
670
671static struct device_attribute card_number_attrs =
672 __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674/**
675 * snd_card_register - register the soundcard
676 * @card: soundcard structure
677 *
678 * This function registers all the devices assigned to the soundcard.
679 * Until calling this, the ALSA control interface is blocked from the
680 * external accesses. Thus, you should call this function at the end
681 * of the initialization of the card.
682 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100683 * Return: Zero otherwise a negative error code if the registration failed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100685int snd_card_register(struct snd_card *card)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686{
687 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200689 if (snd_BUG_ON(!card))
690 return -EINVAL;
Kay Sievers39aba962010-09-04 22:33:14 -0700691
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100692 if (!card->card_dev) {
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700693 card->card_dev = device_create(sound_class, card->dev,
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100694 MKDEV(0, 0), card,
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700695 "card%i", card->number);
Takashi Iwai7d2aae12007-01-26 12:40:31 +0100696 if (IS_ERR(card->card_dev))
697 card->card_dev = NULL;
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700698 }
Kay Sievers39aba962010-09-04 22:33:14 -0700699
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 if ((err = snd_device_register_all(card)) < 0)
701 return err;
Takashi Iwai746df942006-05-15 19:49:05 +0200702 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 if (snd_cards[card->number]) {
704 /* already registered */
Takashi Iwai746df942006-05-15 19:49:05 +0200705 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 return 0;
707 }
Takashi Iwaie7df2a32012-03-09 17:41:53 +0100708 if (*card->id) {
709 /* make a unique id name from the given string */
710 char tmpid[sizeof(card->id)];
711 memcpy(tmpid, card->id, sizeof(card->id));
712 snd_card_set_id_no_lock(card, tmpid, tmpid);
713 } else {
714 /* create an id from either shortname or longname */
715 const char *src;
716 src = *card->shortname ? card->shortname : card->longname;
717 snd_card_set_id_no_lock(card, src,
718 retrieve_id_from_card_name(src));
719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 snd_cards[card->number] = card;
Takashi Iwai746df942006-05-15 19:49:05 +0200721 mutex_unlock(&snd_card_mutex);
Takashi Iwaie28563c2005-12-01 10:42:42 +0100722 init_info_for_card(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
724 if (snd_mixer_oss_notify_callback)
725 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
726#endif
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100727 if (card->card_dev) {
Hannes Eder2af75292008-11-18 12:25:06 -0500728 err = device_create_file(card->card_dev, &card_id_attrs);
729 if (err < 0)
730 return err;
731 err = device_create_file(card->card_dev, &card_number_attrs);
732 if (err < 0)
733 return err;
Jaroslav Kysela9fb61982008-11-11 16:51:02 +0100734 }
Kay Sievers39aba962010-09-04 22:33:14 -0700735
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 return 0;
737}
738
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200739EXPORT_SYMBOL(snd_card_register);
740
Takashi Iwaie28563c2005-12-01 10:42:42 +0100741#ifdef CONFIG_PROC_FS
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200742static struct snd_info_entry *snd_card_info_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Takashi Iwaia381a7a2005-11-17 15:55:49 +0100744static void snd_card_info_read(struct snd_info_entry *entry,
745 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746{
747 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100748 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200751 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if ((card = snd_cards[idx]) != NULL) {
753 count++;
Clemens Ladischd0015442005-11-20 14:09:05 +0100754 snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 idx,
756 card->id,
757 card->driver,
758 card->shortname);
Clemens Ladischd0015442005-11-20 14:09:05 +0100759 snd_iprintf(buffer, " %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 card->longname);
761 }
Takashi Iwai746df942006-05-15 19:49:05 +0200762 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 }
764 if (!count)
765 snd_iprintf(buffer, "--- no soundcards ---\n");
766}
767
Takashi Iwaie28563c2005-12-01 10:42:42 +0100768#ifdef CONFIG_SND_OSSEMUL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Takashi Iwai512bbd62005-11-17 13:51:18 +0100770void snd_card_info_read_oss(struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
772 int idx, count;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100773 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
775 for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200776 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 if ((card = snd_cards[idx]) != NULL) {
778 count++;
779 snd_iprintf(buffer, "%s\n", card->longname);
780 }
Takashi Iwai746df942006-05-15 19:49:05 +0200781 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 }
783 if (!count) {
784 snd_iprintf(buffer, "--- no soundcards ---\n");
785 }
786}
787
788#endif
789
790#ifdef MODULE
Takashi Iwai512bbd62005-11-17 13:51:18 +0100791static struct snd_info_entry *snd_card_module_info_entry;
792static void snd_card_module_info_read(struct snd_info_entry *entry,
793 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794{
795 int idx;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100796 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 for (idx = 0; idx < SNDRV_CARDS; idx++) {
Takashi Iwai746df942006-05-15 19:49:05 +0200799 mutex_lock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 if ((card = snd_cards[idx]) != NULL)
Clemens Ladischd0015442005-11-20 14:09:05 +0100801 snd_iprintf(buffer, "%2i %s\n",
802 idx, card->module->name);
Takashi Iwai746df942006-05-15 19:49:05 +0200803 mutex_unlock(&snd_card_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 }
805}
806#endif
807
808int __init snd_card_info_init(void)
809{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100810 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200813 if (! entry)
814 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 entry->c.text.read = snd_card_info_read;
816 if (snd_info_register(entry) < 0) {
817 snd_info_free_entry(entry);
818 return -ENOMEM;
819 }
820 snd_card_info_entry = entry;
821
822#ifdef MODULE
823 entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
824 if (entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 entry->c.text.read = snd_card_module_info_read;
826 if (snd_info_register(entry) < 0)
827 snd_info_free_entry(entry);
828 else
829 snd_card_module_info_entry = entry;
830 }
831#endif
832
833 return 0;
834}
835
836int __exit snd_card_info_done(void)
837{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200838 snd_info_free_entry(snd_card_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839#ifdef MODULE
Takashi Iwai746d4a02006-06-23 14:37:59 +0200840 snd_info_free_entry(snd_card_module_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841#endif
842 return 0;
843}
844
Takashi Iwaie28563c2005-12-01 10:42:42 +0100845#endif /* CONFIG_PROC_FS */
846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847/**
848 * snd_component_add - add a component string
849 * @card: soundcard structure
850 * @component: the component id string
851 *
852 * This function adds the component id string to the supported list.
853 * The component can be referred from the alsa-lib.
854 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100855 * Return: Zero otherwise a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 */
857
Takashi Iwai512bbd62005-11-17 13:51:18 +0100858int snd_component_add(struct snd_card *card, const char *component)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859{
860 char *ptr;
861 int len = strlen(component);
862
863 ptr = strstr(card->components, component);
864 if (ptr != NULL) {
865 if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
866 return 1;
867 }
868 if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
869 snd_BUG();
870 return -ENOMEM;
871 }
872 if (card->components[0] != '\0')
873 strcat(card->components, " ");
874 strcat(card->components, component);
875 return 0;
876}
877
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200878EXPORT_SYMBOL(snd_component_add);
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880/**
881 * snd_card_file_add - add the file to the file list of the card
882 * @card: soundcard structure
883 * @file: file pointer
884 *
885 * This function adds the file to the file linked-list of the card.
886 * This linked-list is used to keep tracking the connection state,
887 * and to avoid the release of busy resources by hotplug.
888 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100889 * Return: zero or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100891int snd_card_file_add(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892{
893 struct snd_monitor_file *mfile;
894
895 mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
896 if (mfile == NULL)
897 return -ENOMEM;
898 mfile->file = file;
Karsten Wiesea9edfc62006-10-06 16:08:27 +0200899 mfile->disconnected_f_op = NULL;
Takashi Iwaia45e3d62011-03-24 09:50:15 +0100900 INIT_LIST_HEAD(&mfile->shutdown_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 spin_lock(&card->files_lock);
902 if (card->shutdown) {
903 spin_unlock(&card->files_lock);
904 kfree(mfile);
905 return -ENODEV;
906 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100907 list_add(&mfile->list, &card->files_list);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200908 atomic_inc(&card->refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 spin_unlock(&card->files_lock);
910 return 0;
911}
912
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200913EXPORT_SYMBOL(snd_card_file_add);
914
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915/**
916 * snd_card_file_remove - remove the file from the file list
917 * @card: soundcard structure
918 * @file: file pointer
919 *
920 * This function removes the file formerly added to the card via
921 * snd_card_file_add() function.
Takashi Iwai2b29b132006-06-23 14:38:26 +0200922 * If all files are removed and snd_card_free_when_closed() was
923 * called beforehand, it processes the pending release of
924 * resources.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100926 * Return: Zero or a negative error code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100928int snd_card_file_remove(struct snd_card *card, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929{
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100930 struct snd_monitor_file *mfile, *found = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
932 spin_lock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100933 list_for_each_entry(mfile, &card->files_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 if (mfile->file == file) {
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100935 list_del(&mfile->list);
Takashi Iwaia45e3d62011-03-24 09:50:15 +0100936 spin_lock(&shutdown_lock);
937 list_del(&mfile->shutdown_list);
938 spin_unlock(&shutdown_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100939 if (mfile->disconnected_f_op)
940 fops_put(mfile->disconnected_f_op);
941 found = mfile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 break;
943 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 }
Takashi Iwaic4614822006-06-23 14:38:23 +0200945 spin_unlock(&card->files_lock);
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100946 if (!found) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
948 return -ENOENT;
949 }
Takashi Iwai118dd6b2009-02-23 16:35:21 +0100950 kfree(found);
Takashi Iwaia0830db2012-10-16 13:05:59 +0200951 snd_card_unref(card);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 return 0;
953}
954
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200955EXPORT_SYMBOL(snd_card_file_remove);
956
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957#ifdef CONFIG_PM
958/**
959 * snd_power_wait - wait until the power-state is changed.
960 * @card: soundcard structure
961 * @power_state: expected power state
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 *
963 * Waits until the power-state is changed.
964 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100965 * Return: Zero if successful, or a negative error code.
966 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 * Note: the power lock must be active before call.
968 */
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200969int snd_power_wait(struct snd_card *card, unsigned int power_state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970{
971 wait_queue_t wait;
972 int result = 0;
973
974 /* fastpath */
975 if (snd_power_get_state(card) == power_state)
976 return 0;
977 init_waitqueue_entry(&wait, current);
978 add_wait_queue(&card->power_sleep, &wait);
979 while (1) {
980 if (card->shutdown) {
981 result = -ENODEV;
982 break;
983 }
984 if (snd_power_get_state(card) == power_state)
985 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 set_current_state(TASK_UNINTERRUPTIBLE);
987 snd_power_unlock(card);
988 schedule_timeout(30 * HZ);
989 snd_power_lock(card);
990 }
991 remove_wait_queue(&card->power_sleep, &wait);
992 return result;
993}
994
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200995EXPORT_SYMBOL(snd_power_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996#endif /* CONFIG_PM */