![Takashi Iwai](/assets/img/avatar_default.png)
Control Midlevel,ALSA Core,HWDEP Midlevel,PCM Midlevel,RawMidi Midlevel Timer Midlevel,ALSA<-OSS emulation Replace kcalloc(1,..) with kzalloc(). Signed-off-by: Takashi Iwai <tiwai@suse.de>
905 lines
24 KiB
C
905 lines
24 KiB
C
/*
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* Initialization routines
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/file.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/ctype.h>
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#include <linux/pci.h>
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#include <linux/pm.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/info.h>
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struct snd_shutdown_f_ops {
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struct file_operations f_ops;
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struct snd_shutdown_f_ops *next;
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};
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unsigned int snd_cards_lock = 0; /* locked for registering/using */
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snd_card_t *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL};
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DEFINE_RWLOCK(snd_card_rwlock);
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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int (*snd_mixer_oss_notify_callback)(snd_card_t *card, int free_flag);
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#endif
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static void snd_card_id_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
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{
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snd_iprintf(buffer, "%s\n", entry->card->id);
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}
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static void snd_card_free_thread(void * __card);
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/**
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* snd_card_new - create and initialize a soundcard structure
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* @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
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* @xid: card identification (ASCII string)
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* @module: top level module for locking
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* @extra_size: allocate this extra size after the main soundcard structure
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*
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* Creates and initializes a soundcard structure.
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*
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* Returns kmallocated snd_card_t structure. Creates the ALSA control interface
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* (which is blocked until snd_card_register function is called).
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*/
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snd_card_t *snd_card_new(int idx, const char *xid,
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struct module *module, int extra_size)
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{
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snd_card_t *card;
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int err;
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if (extra_size < 0)
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extra_size = 0;
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card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
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if (card == NULL)
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return NULL;
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if (xid) {
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if (!snd_info_check_reserved_words(xid))
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goto __error;
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strlcpy(card->id, xid, sizeof(card->id));
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}
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err = 0;
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write_lock(&snd_card_rwlock);
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if (idx < 0) {
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int idx2;
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for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
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if (~snd_cards_lock & idx & 1<<idx2) {
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idx = idx2;
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if (idx >= snd_ecards_limit)
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snd_ecards_limit = idx + 1;
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break;
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}
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} else if (idx < snd_ecards_limit) {
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if (snd_cards_lock & (1 << idx))
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err = -ENODEV; /* invalid */
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} else if (idx < SNDRV_CARDS)
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snd_ecards_limit = idx + 1; /* increase the limit */
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else
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err = -ENODEV;
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if (idx < 0 || err < 0) {
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write_unlock(&snd_card_rwlock);
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snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1);
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goto __error;
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}
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snd_cards_lock |= 1 << idx; /* lock it */
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write_unlock(&snd_card_rwlock);
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card->number = idx;
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card->module = module;
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INIT_LIST_HEAD(&card->devices);
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init_rwsem(&card->controls_rwsem);
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rwlock_init(&card->ctl_files_rwlock);
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INIT_LIST_HEAD(&card->controls);
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INIT_LIST_HEAD(&card->ctl_files);
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spin_lock_init(&card->files_lock);
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init_waitqueue_head(&card->shutdown_sleep);
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INIT_WORK(&card->free_workq, snd_card_free_thread, card);
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#ifdef CONFIG_PM
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init_MUTEX(&card->power_lock);
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init_waitqueue_head(&card->power_sleep);
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#endif
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/* the control interface cannot be accessed from the user space until */
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/* snd_cards_bitmask and snd_cards are set with snd_card_register */
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if ((err = snd_ctl_create(card)) < 0) {
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snd_printd("unable to register control minors\n");
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goto __error;
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}
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if ((err = snd_info_card_create(card)) < 0) {
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snd_printd("unable to create card info\n");
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goto __error_ctl;
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}
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if (extra_size > 0)
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card->private_data = (char *)card + sizeof(snd_card_t);
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return card;
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__error_ctl:
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snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
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__error:
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kfree(card);
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return NULL;
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}
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static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
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{
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return POLLERR | POLLNVAL;
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}
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/**
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* snd_card_disconnect - disconnect all APIs from the file-operations (user space)
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* @card: soundcard structure
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*
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* Disconnects all APIs from the file-operations (user space).
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*
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* Returns zero, otherwise a negative error code.
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*
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* Note: The current implementation replaces all active file->f_op with special
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* dummy file operations (they do nothing except release).
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*/
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int snd_card_disconnect(snd_card_t * card)
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{
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struct snd_monitor_file *mfile;
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struct file *file;
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struct snd_shutdown_f_ops *s_f_ops;
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struct file_operations *f_ops, *old_f_ops;
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int err;
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spin_lock(&card->files_lock);
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if (card->shutdown) {
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spin_unlock(&card->files_lock);
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return 0;
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}
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card->shutdown = 1;
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spin_unlock(&card->files_lock);
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/* phase 1: disable fops (user space) operations for ALSA API */
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write_lock(&snd_card_rwlock);
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snd_cards[card->number] = NULL;
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write_unlock(&snd_card_rwlock);
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/* phase 2: replace file->f_op with special dummy operations */
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spin_lock(&card->files_lock);
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mfile = card->files;
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while (mfile) {
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file = mfile->file;
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/* it's critical part, use endless loop */
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/* we have no room to fail */
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s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC);
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if (s_f_ops == NULL)
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panic("Atomic allocation failed for snd_shutdown_f_ops!");
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f_ops = &s_f_ops->f_ops;
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memset(f_ops, 0, sizeof(*f_ops));
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f_ops->owner = file->f_op->owner;
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f_ops->release = file->f_op->release;
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f_ops->poll = snd_disconnect_poll;
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s_f_ops->next = card->s_f_ops;
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card->s_f_ops = s_f_ops;
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f_ops = fops_get(f_ops);
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old_f_ops = file->f_op;
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file->f_op = f_ops; /* must be atomic */
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fops_put(old_f_ops);
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mfile = mfile->next;
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}
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spin_unlock(&card->files_lock);
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/* phase 3: notify all connected devices about disconnection */
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/* at this point, they cannot respond to any calls except release() */
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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if (snd_mixer_oss_notify_callback)
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snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
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#endif
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/* notify all devices that we are disconnected */
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err = snd_device_disconnect_all(card);
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if (err < 0)
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snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
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return 0;
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}
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#ifdef CONFIG_SND_GENERIC_DRIVER
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static void snd_generic_device_unregister(snd_card_t *card);
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#else
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#define snd_generic_device_unregister(x) /*NOP*/
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#endif
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/**
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* snd_card_free - frees given soundcard structure
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* @card: soundcard structure
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*
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* This function releases the soundcard structure and the all assigned
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* devices automatically. That is, you don't have to release the devices
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* by yourself.
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*
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* Returns zero. Frees all associated devices and frees the control
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* interface associated to given soundcard.
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*/
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int snd_card_free(snd_card_t * card)
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{
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struct snd_shutdown_f_ops *s_f_ops;
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if (card == NULL)
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return -EINVAL;
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write_lock(&snd_card_rwlock);
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snd_cards[card->number] = NULL;
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write_unlock(&snd_card_rwlock);
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#ifdef CONFIG_PM
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wake_up(&card->power_sleep);
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#endif
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/* wait, until all devices are ready for the free operation */
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wait_event(card->shutdown_sleep, card->files == NULL);
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
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if (snd_mixer_oss_notify_callback)
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snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
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#endif
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if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
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snd_printk(KERN_ERR "unable to free all devices (pre)\n");
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/* Fatal, but this situation should never occur */
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}
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if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
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snd_printk(KERN_ERR "unable to free all devices (normal)\n");
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/* Fatal, but this situation should never occur */
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}
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if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
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snd_printk(KERN_ERR "unable to free all devices (post)\n");
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/* Fatal, but this situation should never occur */
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}
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if (card->private_free)
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card->private_free(card);
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if (card->proc_id)
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snd_info_unregister(card->proc_id);
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if (snd_info_card_free(card) < 0) {
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snd_printk(KERN_WARNING "unable to free card info\n");
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/* Not fatal error */
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}
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snd_generic_device_unregister(card);
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while (card->s_f_ops) {
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s_f_ops = card->s_f_ops;
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card->s_f_ops = s_f_ops->next;
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kfree(s_f_ops);
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}
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write_lock(&snd_card_rwlock);
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snd_cards_lock &= ~(1 << card->number);
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write_unlock(&snd_card_rwlock);
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kfree(card);
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return 0;
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}
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static void snd_card_free_thread(void * __card)
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{
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snd_card_t *card = __card;
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struct module * module = card->module;
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if (!try_module_get(module)) {
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snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number);
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module = NULL;
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}
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snd_card_free(card);
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module_put(module);
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}
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/**
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* snd_card_free_in_thread - call snd_card_free() in thread
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* @card: soundcard structure
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*
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* This function schedules the call of snd_card_free() function in a
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* work queue. When all devices are released (non-busy), the work
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* is woken up and calls snd_card_free().
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*
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* When a card can be disconnected at any time by hotplug service,
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* this function should be used in disconnect (or detach) callback
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* instead of calling snd_card_free() directly.
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*
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* Returns - zero otherwise a negative error code if the start of thread failed.
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*/
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int snd_card_free_in_thread(snd_card_t * card)
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{
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if (card->files == NULL) {
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snd_card_free(card);
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return 0;
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}
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if (schedule_work(&card->free_workq))
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return 0;
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snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number);
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/* try to free the structure immediately */
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snd_card_free(card);
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return -EFAULT;
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}
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static void choose_default_id(snd_card_t * card)
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{
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int i, len, idx_flag = 0, loops = 8;
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char *id, *spos;
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id = spos = card->shortname;
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while (*id != '\0') {
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if (*id == ' ')
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spos = id + 1;
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id++;
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}
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id = card->id;
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while (*spos != '\0' && !isalnum(*spos))
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spos++;
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if (isdigit(*spos))
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*id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D';
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while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) {
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if (isalnum(*spos))
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*id++ = *spos;
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spos++;
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}
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*id = '\0';
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id = card->id;
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if (*id == '\0')
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strcpy(id, "default");
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while (1) {
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if (loops-- == 0) {
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snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id);
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strcpy(card->id, card->proc_root->name);
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return;
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}
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if (!snd_info_check_reserved_words(id))
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goto __change;
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for (i = 0; i < snd_ecards_limit; i++) {
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if (snd_cards[i] && !strcmp(snd_cards[i]->id, id))
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goto __change;
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}
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break;
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__change:
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len = strlen(id);
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if (idx_flag)
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id[len-1]++;
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else if ((size_t)len <= sizeof(card->id) - 3) {
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strcat(id, "_1");
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idx_flag++;
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} else {
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spos = id + len - 2;
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if ((size_t)len <= sizeof(card->id) - 2)
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spos++;
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*spos++ = '_';
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*spos++ = '1';
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*spos++ = '\0';
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idx_flag++;
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}
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}
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}
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|
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/**
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* snd_card_register - register the soundcard
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* @card: soundcard structure
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*
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* This function registers all the devices assigned to the soundcard.
|
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* Until calling this, the ALSA control interface is blocked from the
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* external accesses. Thus, you should call this function at the end
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* of the initialization of the card.
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*
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* Returns zero otherwise a negative error code if the registrain failed.
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*/
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int snd_card_register(snd_card_t * card)
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{
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int err;
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snd_info_entry_t *entry;
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|
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snd_runtime_check(card != NULL, return -EINVAL);
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if ((err = snd_device_register_all(card)) < 0)
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return err;
|
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write_lock(&snd_card_rwlock);
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if (snd_cards[card->number]) {
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/* already registered */
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write_unlock(&snd_card_rwlock);
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return 0;
|
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}
|
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if (card->id[0] == '\0')
|
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choose_default_id(card);
|
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snd_cards[card->number] = card;
|
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write_unlock(&snd_card_rwlock);
|
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if ((err = snd_info_card_register(card)) < 0) {
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snd_printd("unable to create card info\n");
|
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goto __skip_info;
|
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}
|
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if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
|
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snd_printd("unable to create card entry\n");
|
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goto __skip_info;
|
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}
|
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entry->c.text.read_size = PAGE_SIZE;
|
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entry->c.text.read = snd_card_id_read;
|
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if (snd_info_register(entry) < 0) {
|
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snd_info_free_entry(entry);
|
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entry = NULL;
|
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}
|
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card->proc_id = entry;
|
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__skip_info:
|
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#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
|
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if (snd_mixer_oss_notify_callback)
|
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snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
|
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#endif
|
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return 0;
|
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}
|
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|
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static snd_info_entry_t *snd_card_info_entry = NULL;
|
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|
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static void snd_card_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
|
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{
|
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int idx, count;
|
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snd_card_t *card;
|
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|
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for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
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read_lock(&snd_card_rwlock);
|
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if ((card = snd_cards[idx]) != NULL) {
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count++;
|
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snd_iprintf(buffer, "%i [%-15s]: %s - %s\n",
|
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idx,
|
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card->id,
|
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card->driver,
|
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card->shortname);
|
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snd_iprintf(buffer, " %s\n",
|
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card->longname);
|
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}
|
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read_unlock(&snd_card_rwlock);
|
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}
|
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if (!count)
|
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snd_iprintf(buffer, "--- no soundcards ---\n");
|
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}
|
|
|
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#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
|
|
|
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void snd_card_info_read_oss(snd_info_buffer_t * buffer)
|
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{
|
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int idx, count;
|
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snd_card_t *card;
|
|
|
|
for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
|
|
read_lock(&snd_card_rwlock);
|
|
if ((card = snd_cards[idx]) != NULL) {
|
|
count++;
|
|
snd_iprintf(buffer, "%s\n", card->longname);
|
|
}
|
|
read_unlock(&snd_card_rwlock);
|
|
}
|
|
if (!count) {
|
|
snd_iprintf(buffer, "--- no soundcards ---\n");
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef MODULE
|
|
static snd_info_entry_t *snd_card_module_info_entry;
|
|
static void snd_card_module_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
|
|
{
|
|
int idx;
|
|
snd_card_t *card;
|
|
|
|
for (idx = 0; idx < SNDRV_CARDS; idx++) {
|
|
read_lock(&snd_card_rwlock);
|
|
if ((card = snd_cards[idx]) != NULL)
|
|
snd_iprintf(buffer, "%i %s\n", idx, card->module->name);
|
|
read_unlock(&snd_card_rwlock);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int __init snd_card_info_init(void)
|
|
{
|
|
snd_info_entry_t *entry;
|
|
|
|
entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
|
|
snd_runtime_check(entry != NULL, return -ENOMEM);
|
|
entry->c.text.read_size = PAGE_SIZE;
|
|
entry->c.text.read = snd_card_info_read;
|
|
if (snd_info_register(entry) < 0) {
|
|
snd_info_free_entry(entry);
|
|
return -ENOMEM;
|
|
}
|
|
snd_card_info_entry = entry;
|
|
|
|
#ifdef MODULE
|
|
entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
|
|
if (entry) {
|
|
entry->c.text.read_size = PAGE_SIZE;
|
|
entry->c.text.read = snd_card_module_info_read;
|
|
if (snd_info_register(entry) < 0)
|
|
snd_info_free_entry(entry);
|
|
else
|
|
snd_card_module_info_entry = entry;
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __exit snd_card_info_done(void)
|
|
{
|
|
if (snd_card_info_entry)
|
|
snd_info_unregister(snd_card_info_entry);
|
|
#ifdef MODULE
|
|
if (snd_card_module_info_entry)
|
|
snd_info_unregister(snd_card_module_info_entry);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_component_add - add a component string
|
|
* @card: soundcard structure
|
|
* @component: the component id string
|
|
*
|
|
* This function adds the component id string to the supported list.
|
|
* The component can be referred from the alsa-lib.
|
|
*
|
|
* Returns zero otherwise a negative error code.
|
|
*/
|
|
|
|
int snd_component_add(snd_card_t *card, const char *component)
|
|
{
|
|
char *ptr;
|
|
int len = strlen(component);
|
|
|
|
ptr = strstr(card->components, component);
|
|
if (ptr != NULL) {
|
|
if (ptr[len] == '\0' || ptr[len] == ' ') /* already there */
|
|
return 1;
|
|
}
|
|
if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
|
|
snd_BUG();
|
|
return -ENOMEM;
|
|
}
|
|
if (card->components[0] != '\0')
|
|
strcat(card->components, " ");
|
|
strcat(card->components, component);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_card_file_add - add the file to the file list of the card
|
|
* @card: soundcard structure
|
|
* @file: file pointer
|
|
*
|
|
* This function adds the file to the file linked-list of the card.
|
|
* This linked-list is used to keep tracking the connection state,
|
|
* and to avoid the release of busy resources by hotplug.
|
|
*
|
|
* Returns zero or a negative error code.
|
|
*/
|
|
int snd_card_file_add(snd_card_t *card, struct file *file)
|
|
{
|
|
struct snd_monitor_file *mfile;
|
|
|
|
mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
|
|
if (mfile == NULL)
|
|
return -ENOMEM;
|
|
mfile->file = file;
|
|
mfile->next = NULL;
|
|
spin_lock(&card->files_lock);
|
|
if (card->shutdown) {
|
|
spin_unlock(&card->files_lock);
|
|
kfree(mfile);
|
|
return -ENODEV;
|
|
}
|
|
mfile->next = card->files;
|
|
card->files = mfile;
|
|
spin_unlock(&card->files_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_card_file_remove - remove the file from the file list
|
|
* @card: soundcard structure
|
|
* @file: file pointer
|
|
*
|
|
* This function removes the file formerly added to the card via
|
|
* snd_card_file_add() function.
|
|
* If all files are removed and the release of the card is
|
|
* scheduled, it will wake up the the thread to call snd_card_free()
|
|
* (see snd_card_free_in_thread() function).
|
|
*
|
|
* Returns zero or a negative error code.
|
|
*/
|
|
int snd_card_file_remove(snd_card_t *card, struct file *file)
|
|
{
|
|
struct snd_monitor_file *mfile, *pfile = NULL;
|
|
|
|
spin_lock(&card->files_lock);
|
|
mfile = card->files;
|
|
while (mfile) {
|
|
if (mfile->file == file) {
|
|
if (pfile)
|
|
pfile->next = mfile->next;
|
|
else
|
|
card->files = mfile->next;
|
|
break;
|
|
}
|
|
pfile = mfile;
|
|
mfile = mfile->next;
|
|
}
|
|
spin_unlock(&card->files_lock);
|
|
if (card->files == NULL)
|
|
wake_up(&card->shutdown_sleep);
|
|
if (!mfile) {
|
|
snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
|
|
return -ENOENT;
|
|
}
|
|
kfree(mfile);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SND_GENERIC_DRIVER
|
|
/*
|
|
* generic device without a proper bus using platform_device
|
|
* (e.g. ISA)
|
|
*/
|
|
struct snd_generic_device {
|
|
struct platform_device pdev;
|
|
snd_card_t *card;
|
|
};
|
|
|
|
#define get_snd_generic_card(dev) container_of(to_platform_device(dev), struct snd_generic_device, pdev)->card
|
|
|
|
#define SND_GENERIC_NAME "snd_generic"
|
|
|
|
#ifdef CONFIG_PM
|
|
static int snd_generic_suspend(struct device *dev, pm_message_t state, u32 level);
|
|
static int snd_generic_resume(struct device *dev, u32 level);
|
|
#endif
|
|
|
|
/* initialized in sound.c */
|
|
struct device_driver snd_generic_driver = {
|
|
.name = SND_GENERIC_NAME,
|
|
.bus = &platform_bus_type,
|
|
#ifdef CONFIG_PM
|
|
.suspend = snd_generic_suspend,
|
|
.resume = snd_generic_resume,
|
|
#endif
|
|
};
|
|
|
|
void snd_generic_device_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static int snd_generic_device_register(snd_card_t *card)
|
|
{
|
|
struct snd_generic_device *dev;
|
|
int err;
|
|
|
|
if (card->generic_dev)
|
|
return 0; /* already registered */
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (! dev) {
|
|
snd_printk(KERN_ERR "can't allocate generic_device\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev->pdev.name = SND_GENERIC_NAME;
|
|
dev->pdev.id = card->number;
|
|
dev->pdev.dev.release = snd_generic_device_release;
|
|
dev->card = card;
|
|
if ((err = platform_device_register(&dev->pdev)) < 0) {
|
|
kfree(dev);
|
|
return err;
|
|
}
|
|
card->generic_dev = dev;
|
|
return 0;
|
|
}
|
|
|
|
static void snd_generic_device_unregister(snd_card_t *card)
|
|
{
|
|
struct snd_generic_device *dev = card->generic_dev;
|
|
if (dev) {
|
|
platform_device_unregister(&dev->pdev);
|
|
kfree(dev);
|
|
card->generic_dev = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* snd_card_set_generic_dev - assign the generic device to the card
|
|
* @card: soundcard structure
|
|
*
|
|
* Assigns a generic device to the card. This function is provided as the
|
|
* last resort, for devices without any proper bus. Thus this won't override
|
|
* the device already assigned to the card.
|
|
*
|
|
* Returns zero if successful, or a negative error code.
|
|
*/
|
|
int snd_card_set_generic_dev(snd_card_t *card)
|
|
{
|
|
int err;
|
|
if ((err = snd_generic_device_register(card)) < 0)
|
|
return err;
|
|
if (! card->dev)
|
|
snd_card_set_dev(card, &card->generic_dev->pdev.dev);
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_SND_GENERIC_DRIVER */
|
|
|
|
#ifdef CONFIG_PM
|
|
/**
|
|
* snd_power_wait - wait until the power-state is changed.
|
|
* @card: soundcard structure
|
|
* @power_state: expected power state
|
|
* @file: file structure for the O_NONBLOCK check (optional)
|
|
*
|
|
* Waits until the power-state is changed.
|
|
*
|
|
* Note: the power lock must be active before call.
|
|
*/
|
|
int snd_power_wait(snd_card_t *card, unsigned int power_state, struct file *file)
|
|
{
|
|
wait_queue_t wait;
|
|
int result = 0;
|
|
|
|
/* fastpath */
|
|
if (snd_power_get_state(card) == power_state)
|
|
return 0;
|
|
init_waitqueue_entry(&wait, current);
|
|
add_wait_queue(&card->power_sleep, &wait);
|
|
while (1) {
|
|
if (card->shutdown) {
|
|
result = -ENODEV;
|
|
break;
|
|
}
|
|
if (snd_power_get_state(card) == power_state)
|
|
break;
|
|
#if 0 /* block all devices */
|
|
if (file && (file->f_flags & O_NONBLOCK)) {
|
|
result = -EAGAIN;
|
|
break;
|
|
}
|
|
#endif
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
snd_power_unlock(card);
|
|
schedule_timeout(30 * HZ);
|
|
snd_power_lock(card);
|
|
}
|
|
remove_wait_queue(&card->power_sleep, &wait);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* snd_card_set_pm_callback - set the PCI power-management callbacks
|
|
* @card: soundcard structure
|
|
* @suspend: suspend callback function
|
|
* @resume: resume callback function
|
|
* @private_data: private data to pass to the callback functions
|
|
*
|
|
* Sets the power-management callback functions of the card.
|
|
* These callbacks are called from ALSA's common PCI suspend/resume
|
|
* handler and from the control API.
|
|
*/
|
|
int snd_card_set_pm_callback(snd_card_t *card,
|
|
int (*suspend)(snd_card_t *, pm_message_t),
|
|
int (*resume)(snd_card_t *),
|
|
void *private_data)
|
|
{
|
|
card->pm_suspend = suspend;
|
|
card->pm_resume = resume;
|
|
card->pm_private_data = private_data;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SND_GENERIC_DRIVER
|
|
/* suspend/resume callbacks for snd_generic platform device */
|
|
static int snd_generic_suspend(struct device *dev, pm_message_t state, u32 level)
|
|
{
|
|
snd_card_t *card;
|
|
|
|
if (level != SUSPEND_DISABLE)
|
|
return 0;
|
|
|
|
card = get_snd_generic_card(dev);
|
|
if (card->power_state == SNDRV_CTL_POWER_D3hot)
|
|
return 0;
|
|
card->pm_suspend(card, PMSG_SUSPEND);
|
|
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_generic_resume(struct device *dev, u32 level)
|
|
{
|
|
snd_card_t *card;
|
|
|
|
if (level != RESUME_ENABLE)
|
|
return 0;
|
|
|
|
card = get_snd_generic_card(dev);
|
|
if (card->power_state == SNDRV_CTL_POWER_D0)
|
|
return 0;
|
|
card->pm_resume(card);
|
|
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_card_set_generic_pm_callback - set the generic power-management callbacks
|
|
* @card: soundcard structure
|
|
* @suspend: suspend callback function
|
|
* @resume: resume callback function
|
|
* @private_data: private data to pass to the callback functions
|
|
*
|
|
* Registers the power-management and sets the lowlevel callbacks for
|
|
* the given card. These callbacks are called from the ALSA's common
|
|
* PM handler and from the control API.
|
|
*/
|
|
int snd_card_set_generic_pm_callback(snd_card_t *card,
|
|
int (*suspend)(snd_card_t *, pm_message_t),
|
|
int (*resume)(snd_card_t *),
|
|
void *private_data)
|
|
{
|
|
int err;
|
|
if ((err = snd_generic_device_register(card)) < 0)
|
|
return err;
|
|
return snd_card_set_pm_callback(card, suspend, resume, private_data);
|
|
}
|
|
#endif /* CONFIG_SND_GENERIC_DRIVER */
|
|
|
|
#ifdef CONFIG_PCI
|
|
int snd_card_pci_suspend(struct pci_dev *dev, pm_message_t state)
|
|
{
|
|
snd_card_t *card = pci_get_drvdata(dev);
|
|
int err;
|
|
if (! card || ! card->pm_suspend)
|
|
return 0;
|
|
if (card->power_state == SNDRV_CTL_POWER_D3hot)
|
|
return 0;
|
|
err = card->pm_suspend(card, PMSG_SUSPEND);
|
|
pci_save_state(dev);
|
|
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
|
|
return err;
|
|
}
|
|
|
|
int snd_card_pci_resume(struct pci_dev *dev)
|
|
{
|
|
snd_card_t *card = pci_get_drvdata(dev);
|
|
if (! card || ! card->pm_resume)
|
|
return 0;
|
|
if (card->power_state == SNDRV_CTL_POWER_D0)
|
|
return 0;
|
|
/* restore the PCI config space */
|
|
pci_restore_state(dev);
|
|
card->pm_resume(card);
|
|
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_PM */
|