diff options
Diffstat (limited to 'sound/core/init.c')
| -rw-r--r-- | sound/core/init.c | 887 |
1 files changed, 887 insertions, 0 deletions
diff --git a/sound/core/init.c b/sound/core/init.c new file mode 100644 index 00000000000..3f1fa8eabb7 --- /dev/null +++ b/sound/core/init.c @@ -0,0 +1,887 @@ +/* + * Initialization routines + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <sound/driver.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/file.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/ctype.h> +#include <linux/pci.h> +#include <linux/pm.h> +#include <sound/core.h> +#include <sound/control.h> +#include <sound/info.h> + +struct snd_shutdown_f_ops { + struct file_operations f_ops; + struct snd_shutdown_f_ops *next; +}; + +unsigned int snd_cards_lock = 0; /* locked for registering/using */ +snd_card_t *snd_cards[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = NULL}; +DEFINE_RWLOCK(snd_card_rwlock); + +#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) +int (*snd_mixer_oss_notify_callback)(snd_card_t *card, int free_flag); +#endif + +static void snd_card_id_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) +{ + snd_iprintf(buffer, "%s\n", entry->card->id); +} + +static void snd_card_free_thread(void * __card); + +/** + * snd_card_new - create and initialize a soundcard structure + * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] + * @xid: card identification (ASCII string) + * @module: top level module for locking + * @extra_size: allocate this extra size after the main soundcard structure + * + * Creates and initializes a soundcard structure. + * + * Returns kmallocated snd_card_t structure. Creates the ALSA control interface + * (which is blocked until snd_card_register function is called). + */ +snd_card_t *snd_card_new(int idx, const char *xid, + struct module *module, int extra_size) +{ + snd_card_t *card; + int err; + + if (extra_size < 0) + extra_size = 0; + card = kcalloc(1, sizeof(*card) + extra_size, GFP_KERNEL); + if (card == NULL) + return NULL; + if (xid) { + if (!snd_info_check_reserved_words(xid)) + goto __error; + strlcpy(card->id, xid, sizeof(card->id)); + } + err = 0; + write_lock(&snd_card_rwlock); + if (idx < 0) { + int idx2; + for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) + if (~snd_cards_lock & idx & 1<<idx2) { + idx = idx2; + if (idx >= snd_ecards_limit) + snd_ecards_limit = idx + 1; + break; + } + } else if (idx < snd_ecards_limit) { + if (snd_cards_lock & (1 << idx)) + err = -ENODEV; /* invalid */ + } else if (idx < SNDRV_CARDS) + snd_ecards_limit = idx + 1; /* increase the limit */ + else + err = -ENODEV; + if (idx < 0 || err < 0) { + write_unlock(&snd_card_rwlock); + snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i)\n", idx, snd_ecards_limit - 1); + goto __error; + } + snd_cards_lock |= 1 << idx; /* lock it */ + write_unlock(&snd_card_rwlock); + card->number = idx; + card->module = module; + INIT_LIST_HEAD(&card->devices); + init_rwsem(&card->controls_rwsem); + rwlock_init(&card->ctl_files_rwlock); + INIT_LIST_HEAD(&card->controls); + INIT_LIST_HEAD(&card->ctl_files); + spin_lock_init(&card->files_lock); + init_waitqueue_head(&card->shutdown_sleep); + INIT_WORK(&card->free_workq, snd_card_free_thread, card); +#ifdef CONFIG_PM + init_MUTEX(&card->power_lock); + init_waitqueue_head(&card->power_sleep); +#endif + /* the control interface cannot be accessed from the user space until */ + /* snd_cards_bitmask and snd_cards are set with snd_card_register */ + if ((err = snd_ctl_create(card)) < 0) { + snd_printd("unable to register control minors\n"); + goto __error; + } + if ((err = snd_info_card_create(card)) < 0) { + snd_printd("unable to create card info\n"); + goto __error_ctl; + } + if (extra_size > 0) + card->private_data = (char *)card + sizeof(snd_card_t); + return card; + + __error_ctl: + snd_device_free_all(card, SNDRV_DEV_CMD_PRE); + __error: + kfree(card); + return NULL; +} + +static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait) +{ + return POLLERR | POLLNVAL; +} + +/** + * snd_card_disconnect - disconnect all APIs from the file-operations (user space) + * @card: soundcard structure + * + * Disconnects all APIs from the file-operations (user space). + * + * Returns zero, otherwise a negative error code. + * + * Note: The current implementation replaces all active file->f_op with special + * dummy file operations (they do nothing except release). + */ +int snd_card_disconnect(snd_card_t * card) +{ + struct snd_monitor_file *mfile; + struct file *file; + struct snd_shutdown_f_ops *s_f_ops; + struct file_operations *f_ops, *old_f_ops; + int err; + + spin_lock(&card->files_lock); + if (card->shutdown) { + spin_unlock(&card->files_lock); + return 0; + } + card->shutdown = 1; + spin_unlock(&card->files_lock); + + /* phase 1: disable fops (user space) operations for ALSA API */ + write_lock(&snd_card_rwlock); + snd_cards[card->number] = NULL; + write_unlock(&snd_card_rwlock); + + /* phase 2: replace file->f_op with special dummy operations */ + + spin_lock(&card->files_lock); + mfile = card->files; + while (mfile) { + file = mfile->file; + + /* it's critical part, use endless loop */ + /* we have no room to fail */ + s_f_ops = kmalloc(sizeof(struct snd_shutdown_f_ops), GFP_ATOMIC); + if (s_f_ops == NULL) + panic("Atomic allocation failed for snd_shutdown_f_ops!"); + + f_ops = &s_f_ops->f_ops; + + memset(f_ops, 0, sizeof(*f_ops)); + f_ops->owner = file->f_op->owner; + f_ops->release = file->f_op->release; + f_ops->poll = snd_disconnect_poll; + + s_f_ops->next = card->s_f_ops; + card->s_f_ops = s_f_ops; + + f_ops = fops_get(f_ops); + + old_f_ops = file->f_op; + file->f_op = f_ops; /* must be atomic */ + fops_put(old_f_ops); + + mfile = mfile->next; + } + spin_unlock(&card->files_lock); + + /* phase 3: notify all connected devices about disconnection */ + /* at this point, they cannot respond to any calls except release() */ + +#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) + if (snd_mixer_oss_notify_callback) + snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT); +#endif + + /* notify all devices that we are disconnected */ + err = snd_device_disconnect_all(card); + if (err < 0) + snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number); + + return 0; +} + +#if defined(CONFIG_PM) && defined(CONFIG_SND_GENERIC_PM) +static void snd_generic_device_unregister(struct snd_generic_device *dev); +#endif + +/** + * snd_card_free - frees given soundcard structure + * @card: soundcard structure + * + * This function releases the soundcard structure and the all assigned + * devices automatically. That is, you don't have to release the devices + * by yourself. + * + * Returns zero. Frees all associated devices and frees the control + * interface associated to given soundcard. + */ +int snd_card_free(snd_card_t * card) +{ + struct snd_shutdown_f_ops *s_f_ops; + + if (card == NULL) + return -EINVAL; + write_lock(&snd_card_rwlock); + snd_cards[card->number] = NULL; + write_unlock(&snd_card_rwlock); + +#ifdef CONFIG_PM + wake_up(&card->power_sleep); +#ifdef CONFIG_SND_GENERIC_PM + if (card->pm_dev) { + snd_generic_device_unregister(card->pm_dev); + card->pm_dev = NULL; + } +#endif +#endif + + /* wait, until all devices are ready for the free operation */ + wait_event(card->shutdown_sleep, card->files == NULL); + +#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) + if (snd_mixer_oss_notify_callback) + snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE); +#endif + if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) { + snd_printk(KERN_ERR "unable to free all devices (pre)\n"); + /* Fatal, but this situation should never occur */ + } + if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) { + snd_printk(KERN_ERR "unable to free all devices (normal)\n"); + /* Fatal, but this situation should never occur */ + } + if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) { + snd_printk(KERN_ERR "unable to free all devices (post)\n"); + /* Fatal, but this situation should never occur */ + } + if (card->private_free) + card->private_free(card); + if (card->proc_id) + snd_info_unregister(card->proc_id); + if (snd_info_card_free(card) < 0) { + snd_printk(KERN_WARNING "unable to free card info\n"); + /* Not fatal error */ + } + while (card->s_f_ops) { + s_f_ops = card->s_f_ops; + card->s_f_ops = s_f_ops->next; + kfree(s_f_ops); + } + write_lock(&snd_card_rwlock); + snd_cards_lock &= ~(1 << card->number); + write_unlock(&snd_card_rwlock); + kfree(card); + return 0; +} + +static void snd_card_free_thread(void * __card) +{ + snd_card_t *card = __card; + struct module * module = card->module; + + if (!try_module_get(module)) { + snd_printk(KERN_ERR "unable to lock toplevel module for card %i in free thread\n", card->number); + module = NULL; + } + + snd_card_free(card); + + module_put(module); +} + +/** + * snd_card_free_in_thread - call snd_card_free() in thread + * @card: soundcard structure + * + * This function schedules the call of snd_card_free() function in a + * work queue. When all devices are released (non-busy), the work + * is woken up and calls snd_card_free(). + * + * When a card can be disconnected at any time by hotplug service, + * this function should be used in disconnect (or detach) callback + * instead of calling snd_card_free() directly. + * + * Returns - zero otherwise a negative error code if the start of thread failed. + */ +int snd_card_free_in_thread(snd_card_t * card) +{ + if (card->files == NULL) { + snd_card_free(card); + return 0; + } + + if (schedule_work(&card->free_workq)) + return 0; + + snd_printk(KERN_ERR "schedule_work() failed in snd_card_free_in_thread for card %i\n", card->number); + /* try to free the structure immediately */ + snd_card_free(card); + return -EFAULT; +} + +static void choose_default_id(snd_card_t * card) +{ + int i, len, idx_flag = 0, loops = 8; + char *id, *spos; + + id = spos = card->shortname; + while (*id != '\0') { + if (*id == ' ') + spos = id + 1; + id++; + } + id = card->id; + while (*spos != '\0' && !isalnum(*spos)) + spos++; + if (isdigit(*spos)) + *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D'; + while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) { + if (isalnum(*spos)) + *id++ = *spos; + spos++; + } + *id = '\0'; + + id = card->id; + + if (*id == '\0') + strcpy(id, "default"); + + while (1) { + if (loops-- == 0) { + snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id); + strcpy(card->id, card->proc_root->name); + return; + } + if (!snd_info_check_reserved_words(id)) + goto __change; + for (i = 0; i < snd_ecards_limit; i++) { + if (snd_cards[i] && !strcmp(snd_cards[i]->id, id)) + goto __change; + } + break; + + __change: + len = strlen(id); + if (idx_flag) + id[len-1]++; + else if ((size_t)len <= sizeof(card->id) - 3) { + strcat(id, "_1"); + idx_flag++; + } else { + spos = id + len - 2; + if ((size_t)len <= sizeof(card->id) - 2) + spos++; + *spos++ = '_'; + *spos++ = '1'; + *spos++ = '\0'; + idx_flag++; + } + } +} + +/** + * snd_card_register - register the soundcard + * @card: soundcard structure + * + * This function registers all the devices assigned to the soundcard. + * Until calling this, the ALSA control interface is blocked from the + * external accesses. Thus, you should call this function at the end + * of the initialization of the card. + * + * Returns zero otherwise a negative error code if the registrain failed. + */ +int snd_card_register(snd_card_t * card) +{ + int err; + snd_info_entry_t *entry; + + snd_runtime_check(card != NULL, return -EINVAL); + if ((err = snd_device_register_all(card)) < 0) + return err; + write_lock(&snd_card_rwlock); + if (snd_cards[card->number]) { + /* already registered */ + write_unlock(&snd_card_rwlock); + return 0; + } + if (card->id[0] == '\0') + choose_default_id(card); + snd_cards[card->number] = card; + write_unlock(&snd_card_rwlock); + if ((err = snd_info_card_register(card)) < 0) { + snd_printd("unable to create card info\n"); + goto __skip_info; + } + if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) { + snd_printd("unable to create card entry\n"); + goto __skip_info; + } + entry->c.text.read_size = PAGE_SIZE; + entry->c.text.read = snd_card_id_read; + if (snd_info_register(entry) < 0) { + snd_info_free_entry(entry); + entry = NULL; + } + card->proc_id = entry; + __skip_info: +#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) + if (snd_mixer_oss_notify_callback) + snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER); +#endif + return 0; +} + +static snd_info_entry_t *snd_card_info_entry = NULL; + +static void snd_card_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) +{ + int idx, count; + 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, "%i [%-15s]: %s - %s\n", + idx, + card->id, + card->driver, + card->shortname); + snd_iprintf(buffer, " %s\n", + card->longname); + } + read_unlock(&snd_card_rwlock); + } + if (!count) + snd_iprintf(buffer, "--- no soundcards ---\n"); +} + +#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS) + +void snd_card_info_read_oss(snd_info_buffer_t * buffer) +{ + int idx, count; + 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_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_PM +/* + * use platform_device for generic power-management without a proper bus + * (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_pm" + +static int snd_generic_suspend(struct device *dev, u32 state, u32 level); +static int snd_generic_resume(struct device *dev, u32 level); + +static struct device_driver snd_generic_driver = { + .name = SND_GENERIC_NAME, + .bus = &platform_bus_type, + .suspend = snd_generic_suspend, + .resume = snd_generic_resume, +}; + +static int generic_driver_registered; + +static void generic_driver_unregister(void) +{ + if (generic_driver_registered) { + generic_driver_registered--; + if (! generic_driver_registered) + driver_unregister(&snd_generic_driver); + } +} + +static struct snd_generic_device *snd_generic_device_register(snd_card_t *card) +{ + struct snd_generic_device *dev; + + if (! generic_driver_registered) { + if (driver_register(&snd_generic_driver) < 0) + return NULL; + } + generic_driver_registered++; + + dev = kcalloc(1, sizeof(*dev), GFP_KERNEL); + if (! dev) { + generic_driver_unregister(); + return NULL; + } + + dev->pdev.name = SND_GENERIC_NAME; + dev->pdev.id = card->number; + dev->card = card; + if (platform_device_register(&dev->pdev) < 0) { + kfree(dev); + generic_driver_unregister(); + return NULL; + } + return dev; +} + +static void snd_generic_device_unregister(struct snd_generic_device *dev) +{ + platform_device_unregister(&dev->pdev); + kfree(dev); + generic_driver_unregister(); +} + +/* suspend/resume callbacks for snd_generic platform device */ +static int snd_generic_suspend(struct device *dev, u32 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) +{ + card->pm_dev = snd_generic_device_register(card); + if (! card->pm_dev) + return -ENOMEM; + snd_card_set_pm_callback(card, suspend, resume, private_data); + return 0; +} +#endif /* CONFIG_SND_GENERIC_PM */ + +#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 */ |