diff options
Diffstat (limited to 'sound/usb/usbaudio.c')
| -rw-r--r-- | sound/usb/usbaudio.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index 967b823eace..c52461d4a04 100644 --- a/sound/usb/usbaudio.c +++ b/sound/usb/usbaudio.c @@ -2077,6 +2077,8 @@ int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request, static int usb_audio_probe(struct usb_interface *intf, const struct usb_device_id *id); static void usb_audio_disconnect(struct usb_interface *intf); +static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message); +static int usb_audio_resume(struct usb_interface *intf); static struct usb_device_id usb_audio_ids [] = { #include "usbquirks.h" @@ -2092,6 +2094,8 @@ static struct usb_driver usb_audio_driver = { .name = "snd-usb-audio", .probe = usb_audio_probe, .disconnect = usb_audio_disconnect, + .suspend = usb_audio_suspend, + .resume = usb_audio_resume, .id_table = usb_audio_ids, }; @@ -3654,6 +3658,43 @@ static void usb_audio_disconnect(struct usb_interface *intf) dev_get_drvdata(&intf->dev)); } +static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message) +{ + struct snd_usb_audio *chip = dev_get_drvdata(&intf->dev); + struct list_head *p; + struct snd_usb_stream *as; + + if (chip == (void *)-1L) + return 0; + + snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot); + if (!chip->num_suspended_intf++) { + list_for_each(p, &chip->pcm_list) { + as = list_entry(p, struct snd_usb_stream, list); + snd_pcm_suspend_all(as->pcm); + } + } + + return 0; +} + +static int usb_audio_resume(struct usb_interface *intf) +{ + struct snd_usb_audio *chip = dev_get_drvdata(&intf->dev); + + if (chip == (void *)-1L) + return 0; + if (--chip->num_suspended_intf) + return 0; + /* + * ALSA leaves material resumption to user space + * we just notify + */ + + snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0); + + return 0; +} static int __init snd_usb_audio_init(void) { |