From f85bf29c9435baf927e1817e6b43c9429b84f822 Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Fri, 14 Dec 2007 14:42:41 +0100 Subject: [ALSA] usb audio suspend support This patch implements suspend/resume support for USB audio devices. It works with the microphone in my camera. Signed-off-by: Oliver Neukum Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- sound/usb/usbaudio.c | 41 +++++++++++++++++++++++++++++++++++++++++ sound/usb/usbaudio.h | 1 + 2 files changed, 42 insertions(+) (limited to 'sound/usb') diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index 967b823eace0..c52461d4a042 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) { diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h index 2272f45a1867..7cf18c38dc42 100644 --- a/sound/usb/usbaudio.h +++ b/sound/usb/usbaudio.h @@ -126,6 +126,7 @@ struct snd_usb_audio { u32 usb_id; int shutdown; int num_interfaces; + int num_suspended_intf; struct list_head pcm_list; /* list of pcm streams */ int pcm_devs; -- cgit v1.2.3