Hi,
this patch implements suspend/resume support for USB audio devices.
It works with the microphone in my camera.
Signed-off-by: Oliver Neukum <[EMAIL PROTECTED]>
Regards
Oliver
----
--- a/sound/usb/usbaudio.h 2007-08-31 12:27:57.000000000 +0200
+++ b/sound/usb/usbaudio.h 2007-08-31 12:29:55.000000000 +0200
@@ -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;
--- a/sound/usb/usbaudio.c 2007-08-31 12:21:21.000000000 +0200
+++ b/sound/usb/usbaudio.c 2007-08-31 15:32:09.000000000 +0200
@@ -2078,6 +2078,8 @@ int snd_usb_ctl_msg(struct usb_device *d
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"
@@ -2093,6 +2095,8 @@ static struct usb_driver usb_audio_drive
.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,
};
@@ -3664,6 +3668,43 @@ static void usb_audio_disconnect(struct
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)
{
-
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