-/**
- * 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, pm_message_t 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, 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)
-{
- 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
-