1 files changed, 59 insertions, 9 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 800f7cb4f251..40722f8711ad 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -65,6 +65,7 @@
 #include "pcm.h"
 #include "urb.h"
 #include "format.h"
+#include "power.h"
 
 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
 MODULE_DESCRIPTION("USB Audio");
@@ -323,12 +324,14 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
 		return -ENOMEM;
 	}
 
+	mutex_init(&chip->shutdown_mutex);
 	chip->index = idx;
 	chip->dev = dev;
 	chip->card = card;
 	chip->setup = device_setup[idx];
 	chip->nrpacks = nrpacks;
 	chip->async_unlink = async_unlink;
+	chip->probing = 1;
 
 	chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
 			      le16_to_cpu(dev->descriptor.idProduct));
@@ -450,6 +453,7 @@ static void *snd_usb_audio_probe(struct usb_device *dev,
 				goto __error;
 			}
 			chip = usb_chip[i];
+			chip->probing = 1;
 			break;
 		}
 	}
@@ -465,6 +469,7 @@ static void *snd_usb_audio_probe(struct usb_device *dev,
 					goto __error;
 				}
 				snd_card_set_dev(chip->card, &intf->dev);
+				chip->pm_intf = intf;
 				break;
 			}
 		if (!chip) {
@@ -504,6 +509,7 @@ static void *snd_usb_audio_probe(struct usb_device *dev,
 
 	usb_chip[chip->index] = chip;
 	chip->num_interfaces++;
+	chip->probing = 0;
 	mutex_unlock(&register_mutex);
 	return chip;
 
@@ -531,6 +537,7 @@ static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
 	chip = ptr;
 	card = chip->card;
 	mutex_lock(&register_mutex);
+	mutex_lock(&chip->shutdown_mutex);
 	chip->shutdown = 1;
 	chip->num_interfaces--;
 	if (chip->num_interfaces <= 0) {
@@ -548,9 +555,11 @@ static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
 			snd_usb_mixer_disconnect(p);
 		}
 		usb_chip[chip->index] = NULL;
+		mutex_unlock(&chip->shutdown_mutex);
 		mutex_unlock(&register_mutex);
 		snd_card_free_when_closed(card);
 	} else {
+		mutex_unlock(&chip->shutdown_mutex);
 		mutex_unlock(&register_mutex);
 	}
 }
@@ -577,29 +586,61 @@ static void usb_audio_disconnect(struct usb_interface *intf)
 }
 
 #ifdef CONFIG_PM
+
+int snd_usb_autoresume(struct snd_usb_audio *chip)
+{
+	int err = -ENODEV;
+
+	if (!chip->shutdown && !chip->probing)
+		err = usb_autopm_get_interface(chip->pm_intf);
+
+	return err;
+}
+
+void snd_usb_autosuspend(struct snd_usb_audio *chip)
+{
+	if (!chip->shutdown && !chip->probing)
+		usb_autopm_put_interface(chip->pm_intf);
+}
+
 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct snd_usb_audio *chip = usb_get_intfdata(intf);
 	struct list_head *p;
 	struct snd_usb_stream *as;
+	struct usb_mixer_interface *mixer;
 
 	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);
-		}
+	if (!(message.event & PM_EVENT_AUTO)) {
+		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);
+			}
+ 		}
+	} else {
+		/*
+		 * otherwise we keep the rest of the system in the dark
+		 * to keep this transparent
+		 */
+		if (!chip->num_suspended_intf++)
+			chip->autosuspended = 1;
 	}
 
+	list_for_each_entry(mixer, &chip->mixer_list, list)
+		snd_usb_mixer_inactivate(mixer);
+
 	return 0;
 }
 
 static int usb_audio_resume(struct usb_interface *intf)
 {
 	struct snd_usb_audio *chip = usb_get_intfdata(intf);
+	struct usb_mixer_interface *mixer;
+	int err = 0;
 
 	if (chip == (void *)-1L)
 		return 0;
@@ -607,12 +648,20 @@ static int usb_audio_resume(struct usb_interface *intf)
 		return 0;
 	/*
 	 * ALSA leaves material resumption to user space
-	 * we just notify
+	 * we just notify and restart the mixers
 	 */
+	list_for_each_entry(mixer, &chip->mixer_list, list) {
+		err = snd_usb_mixer_activate(mixer);
+		if (err < 0)
+			goto err_out;
+	}
 
-	snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
+	if (!chip->autosuspended)
+		snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
+	chip->autosuspended = 0;
 
-	return 0;
+err_out:
+	return err;
 }
 #else
 #define usb_audio_suspend	NULL
@@ -640,6 +689,7 @@ static struct usb_driver usb_audio_driver = {
 	.suspend =	usb_audio_suspend,
 	.resume =	usb_audio_resume,
 	.id_table =	usb_audio_ids,
+	.supports_autosuspend = 1,
 };
 
 static int __init snd_usb_audio_init(void)