2 * Initialization routines
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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.
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.
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
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/file.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/ctype.h>
29 #include <linux/pci.h>
32 #include <sound/core.h>
33 #include <sound/control.h>
34 #include <sound/info.h>
36 static DEFINE_SPINLOCK(shutdown_lock
);
37 static LIST_HEAD(shutdown_files
);
39 static struct file_operations snd_shutdown_f_ops
;
41 static unsigned int snd_cards_lock
; /* locked for registering/using */
42 struct snd_card
*snd_cards
[SNDRV_CARDS
];
43 EXPORT_SYMBOL(snd_cards
);
45 static DEFINE_MUTEX(snd_card_mutex
);
47 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
48 int (*snd_mixer_oss_notify_callback
)(struct snd_card
*card
, int free_flag
);
49 EXPORT_SYMBOL(snd_mixer_oss_notify_callback
);
53 static void snd_card_id_read(struct snd_info_entry
*entry
,
54 struct snd_info_buffer
*buffer
)
56 snd_iprintf(buffer
, "%s\n", entry
->card
->id
);
59 static inline int init_info_for_card(struct snd_card
*card
)
62 struct snd_info_entry
*entry
;
64 if ((err
= snd_info_card_register(card
)) < 0) {
65 snd_printd("unable to create card info\n");
68 if ((entry
= snd_info_create_card_entry(card
, "id", card
->proc_root
)) == NULL
) {
69 snd_printd("unable to create card entry\n");
72 entry
->c
.text
.read
= snd_card_id_read
;
73 if (snd_info_register(entry
) < 0) {
74 snd_info_free_entry(entry
);
77 card
->proc_id
= entry
;
80 #else /* !CONFIG_PROC_FS */
81 #define init_info_for_card(card)
85 * snd_card_new - create and initialize a soundcard structure
86 * @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
87 * @xid: card identification (ASCII string)
88 * @module: top level module for locking
89 * @extra_size: allocate this extra size after the main soundcard structure
91 * Creates and initializes a soundcard structure.
93 * Returns kmallocated snd_card structure. Creates the ALSA control interface
94 * (which is blocked until snd_card_register function is called).
96 struct snd_card
*snd_card_new(int idx
, const char *xid
,
97 struct module
*module
, int extra_size
)
99 struct snd_card
*card
;
104 card
= kzalloc(sizeof(*card
) + extra_size
, GFP_KERNEL
);
108 if (!snd_info_check_reserved_words(xid
))
110 strlcpy(card
->id
, xid
, sizeof(card
->id
));
113 mutex_lock(&snd_card_mutex
);
116 for (idx2
= 0; idx2
< SNDRV_CARDS
; idx2
++)
117 if (~snd_cards_lock
& idx
& 1<<idx2
) {
119 if (idx
>= snd_ecards_limit
)
120 snd_ecards_limit
= idx
+ 1;
123 } else if (idx
< snd_ecards_limit
) {
124 if (snd_cards_lock
& (1 << idx
))
125 err
= -ENODEV
; /* invalid */
126 } else if (idx
< SNDRV_CARDS
)
127 snd_ecards_limit
= idx
+ 1; /* increase the limit */
130 if (idx
< 0 || err
< 0) {
131 mutex_unlock(&snd_card_mutex
);
132 snd_printk(KERN_ERR
"cannot find the slot for index %d (range 0-%i)\n", idx
, snd_ecards_limit
- 1);
135 snd_cards_lock
|= 1 << idx
; /* lock it */
136 mutex_unlock(&snd_card_mutex
);
138 card
->module
= module
;
139 INIT_LIST_HEAD(&card
->devices
);
140 init_rwsem(&card
->controls_rwsem
);
141 rwlock_init(&card
->ctl_files_rwlock
);
142 INIT_LIST_HEAD(&card
->controls
);
143 INIT_LIST_HEAD(&card
->ctl_files
);
144 spin_lock_init(&card
->files_lock
);
145 init_waitqueue_head(&card
->shutdown_sleep
);
147 mutex_init(&card
->power_lock
);
148 init_waitqueue_head(&card
->power_sleep
);
150 /* the control interface cannot be accessed from the user space until */
151 /* snd_cards_bitmask and snd_cards are set with snd_card_register */
152 if ((err
= snd_ctl_create(card
)) < 0) {
153 snd_printd("unable to register control minors\n");
156 if ((err
= snd_info_card_create(card
)) < 0) {
157 snd_printd("unable to create card info\n");
161 card
->private_data
= (char *)card
+ sizeof(struct snd_card
);
165 snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
);
171 EXPORT_SYMBOL(snd_card_new
);
173 /* return non-zero if a card is already locked */
174 int snd_card_locked(int card
)
178 mutex_lock(&snd_card_mutex
);
179 locked
= snd_cards_lock
& (1 << card
);
180 mutex_unlock(&snd_card_mutex
);
184 static loff_t
snd_disconnect_llseek(struct file
*file
, loff_t offset
, int orig
)
189 static ssize_t
snd_disconnect_read(struct file
*file
, char __user
*buf
,
190 size_t count
, loff_t
*offset
)
195 static ssize_t
snd_disconnect_write(struct file
*file
, const char __user
*buf
,
196 size_t count
, loff_t
*offset
)
201 static int snd_disconnect_release(struct inode
*inode
, struct file
*file
)
203 struct snd_monitor_file
*df
= NULL
, *_df
;
205 spin_lock(&shutdown_lock
);
206 list_for_each_entry(_df
, &shutdown_files
, shutdown_list
) {
207 if (_df
->file
== file
) {
212 spin_unlock(&shutdown_lock
);
215 return df
->disconnected_f_op
->release(inode
, file
);
217 panic("%s(%p, %p) failed!", __FUNCTION__
, inode
, file
);
220 static unsigned int snd_disconnect_poll(struct file
* file
, poll_table
* wait
)
222 return POLLERR
| POLLNVAL
;
225 static long snd_disconnect_ioctl(struct file
*file
,
226 unsigned int cmd
, unsigned long arg
)
231 static int snd_disconnect_mmap(struct file
*file
, struct vm_area_struct
*vma
)
236 static int snd_disconnect_fasync(int fd
, struct file
*file
, int on
)
241 static struct file_operations snd_shutdown_f_ops
=
243 .owner
= THIS_MODULE
,
244 .llseek
= snd_disconnect_llseek
,
245 .read
= snd_disconnect_read
,
246 .write
= snd_disconnect_write
,
247 .release
= snd_disconnect_release
,
248 .poll
= snd_disconnect_poll
,
249 .unlocked_ioctl
= snd_disconnect_ioctl
,
251 .compat_ioctl
= snd_disconnect_ioctl
,
253 .mmap
= snd_disconnect_mmap
,
254 .fasync
= snd_disconnect_fasync
258 * snd_card_disconnect - disconnect all APIs from the file-operations (user space)
259 * @card: soundcard structure
261 * Disconnects all APIs from the file-operations (user space).
263 * Returns zero, otherwise a negative error code.
265 * Note: The current implementation replaces all active file->f_op with special
266 * dummy file operations (they do nothing except release).
268 int snd_card_disconnect(struct snd_card
*card
)
270 struct snd_monitor_file
*mfile
;
274 spin_lock(&card
->files_lock
);
275 if (card
->shutdown
) {
276 spin_unlock(&card
->files_lock
);
280 spin_unlock(&card
->files_lock
);
282 /* phase 1: disable fops (user space) operations for ALSA API */
283 mutex_lock(&snd_card_mutex
);
284 snd_cards
[card
->number
] = NULL
;
285 mutex_unlock(&snd_card_mutex
);
287 /* phase 2: replace file->f_op with special dummy operations */
289 spin_lock(&card
->files_lock
);
294 /* it's critical part, use endless loop */
295 /* we have no room to fail */
296 mfile
->disconnected_f_op
= mfile
->file
->f_op
;
298 spin_lock(&shutdown_lock
);
299 list_add(&mfile
->shutdown_list
, &shutdown_files
);
300 spin_unlock(&shutdown_lock
);
302 fops_get(&snd_shutdown_f_ops
);
303 mfile
->file
->f_op
= &snd_shutdown_f_ops
;
307 spin_unlock(&card
->files_lock
);
309 /* phase 3: notify all connected devices about disconnection */
310 /* at this point, they cannot respond to any calls except release() */
312 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
313 if (snd_mixer_oss_notify_callback
)
314 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_DISCONNECT
);
317 /* notify all devices that we are disconnected */
318 err
= snd_device_disconnect_all(card
);
320 snd_printk(KERN_ERR
"not all devices for card %i can be disconnected\n", card
->number
);
322 snd_info_card_disconnect(card
);
326 EXPORT_SYMBOL(snd_card_disconnect
);
329 * snd_card_free - frees given soundcard structure
330 * @card: soundcard structure
332 * This function releases the soundcard structure and the all assigned
333 * devices automatically. That is, you don't have to release the devices
336 * Returns zero. Frees all associated devices and frees the control
337 * interface associated to given soundcard.
339 static int snd_card_do_free(struct snd_card
*card
)
341 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
342 if (snd_mixer_oss_notify_callback
)
343 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_FREE
);
345 if (snd_device_free_all(card
, SNDRV_DEV_CMD_PRE
) < 0) {
346 snd_printk(KERN_ERR
"unable to free all devices (pre)\n");
347 /* Fatal, but this situation should never occur */
349 if (snd_device_free_all(card
, SNDRV_DEV_CMD_NORMAL
) < 0) {
350 snd_printk(KERN_ERR
"unable to free all devices (normal)\n");
351 /* Fatal, but this situation should never occur */
353 if (snd_device_free_all(card
, SNDRV_DEV_CMD_POST
) < 0) {
354 snd_printk(KERN_ERR
"unable to free all devices (post)\n");
355 /* Fatal, but this situation should never occur */
357 if (card
->private_free
)
358 card
->private_free(card
);
359 snd_info_free_entry(card
->proc_id
);
360 if (snd_info_card_free(card
) < 0) {
361 snd_printk(KERN_WARNING
"unable to free card info\n");
362 /* Not fatal error */
368 static int snd_card_free_prepare(struct snd_card
*card
)
372 (void) snd_card_disconnect(card
);
373 mutex_lock(&snd_card_mutex
);
374 snd_cards
[card
->number
] = NULL
;
375 snd_cards_lock
&= ~(1 << card
->number
);
376 mutex_unlock(&snd_card_mutex
);
378 wake_up(&card
->power_sleep
);
383 int snd_card_free_when_closed(struct snd_card
*card
)
386 int ret
= snd_card_free_prepare(card
);
390 spin_lock(&card
->files_lock
);
391 if (card
->files
== NULL
)
394 card
->free_on_last_close
= 1;
395 spin_unlock(&card
->files_lock
);
398 snd_card_do_free(card
);
402 EXPORT_SYMBOL(snd_card_free_when_closed
);
404 int snd_card_free(struct snd_card
*card
)
406 int ret
= snd_card_free_prepare(card
);
410 /* wait, until all devices are ready for the free operation */
411 wait_event(card
->shutdown_sleep
, card
->files
== NULL
);
412 snd_card_do_free(card
);
416 EXPORT_SYMBOL(snd_card_free
);
418 static void choose_default_id(struct snd_card
*card
)
420 int i
, len
, idx_flag
= 0, loops
= SNDRV_CARDS
;
423 id
= spos
= card
->shortname
;
424 while (*id
!= '\0') {
430 while (*spos
!= '\0' && !isalnum(*spos
))
433 *id
++ = isalpha(card
->shortname
[0]) ? card
->shortname
[0] : 'D';
434 while (*spos
!= '\0' && (size_t)(id
- card
->id
) < sizeof(card
->id
) - 1) {
444 strcpy(id
, "default");
448 snd_printk(KERN_ERR
"unable to choose default card id (%s)\n", id
);
449 strcpy(card
->id
, card
->proc_root
->name
);
452 if (!snd_info_check_reserved_words(id
))
454 for (i
= 0; i
< snd_ecards_limit
; i
++) {
455 if (snd_cards
[i
] && !strcmp(snd_cards
[i
]->id
, id
))
463 if (id
[len
-1] != '9')
467 } else if ((size_t)len
<= sizeof(card
->id
) - 3) {
472 if ((size_t)len
<= sizeof(card
->id
) - 2)
483 * snd_card_register - register the soundcard
484 * @card: soundcard structure
486 * This function registers all the devices assigned to the soundcard.
487 * Until calling this, the ALSA control interface is blocked from the
488 * external accesses. Thus, you should call this function at the end
489 * of the initialization of the card.
491 * Returns zero otherwise a negative error code if the registrain failed.
493 int snd_card_register(struct snd_card
*card
)
497 snd_assert(card
!= NULL
, return -EINVAL
);
498 if ((err
= snd_device_register_all(card
)) < 0)
500 mutex_lock(&snd_card_mutex
);
501 if (snd_cards
[card
->number
]) {
502 /* already registered */
503 mutex_unlock(&snd_card_mutex
);
506 if (card
->id
[0] == '\0')
507 choose_default_id(card
);
508 snd_cards
[card
->number
] = card
;
509 mutex_unlock(&snd_card_mutex
);
510 init_info_for_card(card
);
511 #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
512 if (snd_mixer_oss_notify_callback
)
513 snd_mixer_oss_notify_callback(card
, SND_MIXER_OSS_NOTIFY_REGISTER
);
518 EXPORT_SYMBOL(snd_card_register
);
520 #ifdef CONFIG_PROC_FS
521 static struct snd_info_entry
*snd_card_info_entry
;
523 static void snd_card_info_read(struct snd_info_entry
*entry
,
524 struct snd_info_buffer
*buffer
)
527 struct snd_card
*card
;
529 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
530 mutex_lock(&snd_card_mutex
);
531 if ((card
= snd_cards
[idx
]) != NULL
) {
533 snd_iprintf(buffer
, "%2i [%-15s]: %s - %s\n",
538 snd_iprintf(buffer
, " %s\n",
541 mutex_unlock(&snd_card_mutex
);
544 snd_iprintf(buffer
, "--- no soundcards ---\n");
547 #ifdef CONFIG_SND_OSSEMUL
549 void snd_card_info_read_oss(struct snd_info_buffer
*buffer
)
552 struct snd_card
*card
;
554 for (idx
= count
= 0; idx
< SNDRV_CARDS
; idx
++) {
555 mutex_lock(&snd_card_mutex
);
556 if ((card
= snd_cards
[idx
]) != NULL
) {
558 snd_iprintf(buffer
, "%s\n", card
->longname
);
560 mutex_unlock(&snd_card_mutex
);
563 snd_iprintf(buffer
, "--- no soundcards ---\n");
570 static struct snd_info_entry
*snd_card_module_info_entry
;
571 static void snd_card_module_info_read(struct snd_info_entry
*entry
,
572 struct snd_info_buffer
*buffer
)
575 struct snd_card
*card
;
577 for (idx
= 0; idx
< SNDRV_CARDS
; idx
++) {
578 mutex_lock(&snd_card_mutex
);
579 if ((card
= snd_cards
[idx
]) != NULL
)
580 snd_iprintf(buffer
, "%2i %s\n",
581 idx
, card
->module
->name
);
582 mutex_unlock(&snd_card_mutex
);
587 int __init
snd_card_info_init(void)
589 struct snd_info_entry
*entry
;
591 entry
= snd_info_create_module_entry(THIS_MODULE
, "cards", NULL
);
594 entry
->c
.text
.read
= snd_card_info_read
;
595 if (snd_info_register(entry
) < 0) {
596 snd_info_free_entry(entry
);
599 snd_card_info_entry
= entry
;
602 entry
= snd_info_create_module_entry(THIS_MODULE
, "modules", NULL
);
604 entry
->c
.text
.read
= snd_card_module_info_read
;
605 if (snd_info_register(entry
) < 0)
606 snd_info_free_entry(entry
);
608 snd_card_module_info_entry
= entry
;
615 int __exit
snd_card_info_done(void)
617 snd_info_free_entry(snd_card_info_entry
);
619 snd_info_free_entry(snd_card_module_info_entry
);
624 #endif /* CONFIG_PROC_FS */
627 * snd_component_add - add a component string
628 * @card: soundcard structure
629 * @component: the component id string
631 * This function adds the component id string to the supported list.
632 * The component can be referred from the alsa-lib.
634 * Returns zero otherwise a negative error code.
637 int snd_component_add(struct snd_card
*card
, const char *component
)
640 int len
= strlen(component
);
642 ptr
= strstr(card
->components
, component
);
644 if (ptr
[len
] == '\0' || ptr
[len
] == ' ') /* already there */
647 if (strlen(card
->components
) + 1 + len
+ 1 > sizeof(card
->components
)) {
651 if (card
->components
[0] != '\0')
652 strcat(card
->components
, " ");
653 strcat(card
->components
, component
);
657 EXPORT_SYMBOL(snd_component_add
);
660 * snd_card_file_add - add the file to the file list of the card
661 * @card: soundcard structure
662 * @file: file pointer
664 * This function adds the file to the file linked-list of the card.
665 * This linked-list is used to keep tracking the connection state,
666 * and to avoid the release of busy resources by hotplug.
668 * Returns zero or a negative error code.
670 int snd_card_file_add(struct snd_card
*card
, struct file
*file
)
672 struct snd_monitor_file
*mfile
;
674 mfile
= kmalloc(sizeof(*mfile
), GFP_KERNEL
);
678 mfile
->disconnected_f_op
= NULL
;
680 spin_lock(&card
->files_lock
);
681 if (card
->shutdown
) {
682 spin_unlock(&card
->files_lock
);
686 mfile
->next
= card
->files
;
688 spin_unlock(&card
->files_lock
);
692 EXPORT_SYMBOL(snd_card_file_add
);
695 * snd_card_file_remove - remove the file from the file list
696 * @card: soundcard structure
697 * @file: file pointer
699 * This function removes the file formerly added to the card via
700 * snd_card_file_add() function.
701 * If all files are removed and snd_card_free_when_closed() was
702 * called beforehand, it processes the pending release of
705 * Returns zero or a negative error code.
707 int snd_card_file_remove(struct snd_card
*card
, struct file
*file
)
709 struct snd_monitor_file
*mfile
, *pfile
= NULL
;
712 spin_lock(&card
->files_lock
);
715 if (mfile
->file
== file
) {
717 pfile
->next
= mfile
->next
;
719 card
->files
= mfile
->next
;
725 if (mfile
&& mfile
->disconnected_f_op
) {
726 fops_put(mfile
->disconnected_f_op
);
727 spin_lock(&shutdown_lock
);
728 list_del(&mfile
->shutdown_list
);
729 spin_unlock(&shutdown_lock
);
731 if (card
->files
== NULL
)
733 spin_unlock(&card
->files_lock
);
735 wake_up(&card
->shutdown_sleep
);
736 if (card
->free_on_last_close
)
737 snd_card_do_free(card
);
740 snd_printk(KERN_ERR
"ALSA card file remove problem (%p)\n", file
);
747 EXPORT_SYMBOL(snd_card_file_remove
);
751 * snd_power_wait - wait until the power-state is changed.
752 * @card: soundcard structure
753 * @power_state: expected power state
755 * Waits until the power-state is changed.
757 * Note: the power lock must be active before call.
759 int snd_power_wait(struct snd_card
*card
, unsigned int power_state
)
765 if (snd_power_get_state(card
) == power_state
)
767 init_waitqueue_entry(&wait
, current
);
768 add_wait_queue(&card
->power_sleep
, &wait
);
770 if (card
->shutdown
) {
774 if (snd_power_get_state(card
) == power_state
)
776 set_current_state(TASK_UNINTERRUPTIBLE
);
777 snd_power_unlock(card
);
778 schedule_timeout(30 * HZ
);
779 snd_power_lock(card
);
781 remove_wait_queue(&card
->power_sleep
, &wait
);
785 EXPORT_SYMBOL(snd_power_wait
);
786 #endif /* CONFIG_PM */