ALSA: usbaudio: implement USB autosuspend

Devices are autosuspended if no pcm nor midi channel is open
Mixer devices may be opened. This way they are active when
in use to play or record sound, but can be suspended while
users have a mixer application running.

[Small clean-ups using static inline by tiwai]

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

6 files changed, 118 insertions, 22 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 7fa53d91e73b..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");
@@ -330,6 +331,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
         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));
@@ -451,6 +453,7 @@ static void *snd_usb_audio_probe(struct usb_device *dev,
                                 goto __error;
                         }
                         chip = usb_chip[i];
+                        chip->probing = 1;
                         break;
                 }
         }
@@ -466,6 +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) {
@@ -505,6 +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;
 
@@ -581,6 +586,23 @@ 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);
@@ -591,18 +613,26 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
         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);
-                }
-
-                list_for_each_entry(mixer, &chip->mixer_list, list) {
-                        snd_usb_mixer_inactivate(mixer);
-                }
+        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;
 }
 
@@ -610,6 +640,7 @@ 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;
@@ -619,12 +650,18 @@ static int usb_audio_resume(struct usb_interface *intf)
          * ALSA leaves material resumption to user space
          * we just notify and restart the mixers
          */
-        list_for_each_entry(mixer, &chip->mixer_list, list)
-                snd_usb_mixer_activate(mixer);
+        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
@@ -652,6 +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)
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index db2dc5ffe6dd..b4b39c0b6c9e 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -54,6 +54,7 @@
 #include <sound/asequencer.h>
 #include "usbaudio.h"
 #include "midi.h"
+#include "power.h"
 #include "helper.h"
 
 /*
@@ -1044,6 +1045,7 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
         struct snd_usb_midi* umidi = substream->rmidi->private_data;
         struct usbmidi_out_port* port = NULL;
         int i, j;
+        int err;
 
         for (i = 0; i < MIDI_MAX_ENDPOINTS; ++i)
                 if (umidi->endpoints[i].out)
@@ -1056,6 +1058,9 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
                 snd_BUG();
                 return -ENXIO;
         }
+        err = usb_autopm_get_interface(umidi->iface);
+        if (err < 0)
+                return -EIO;
         substream->runtime->private_data = port;
         port->state = STATE_UNKNOWN;
         substream_open(substream, 1);
@@ -1064,7 +1069,10 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
 
 static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
 {
+        struct snd_usb_midi* umidi = substream->rmidi->private_data;
+
         substream_open(substream, 0);
+        usb_autopm_put_interface(umidi->iface);
         return 0;
 }
 
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 09e59345bb6d..5e4775716607 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -61,6 +61,7 @@
 #include "mixer.h"
 #include "helper.h"
 #include "mixer_quirks.h"
+#include "power.h"
 
 #define MAX_ID_ELEMS    256
 
@@ -295,16 +296,22 @@ static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int v
         unsigned char buf[2];
         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
         int timeout = 10;
+        int err;
 
+        err = snd_usb_autoresume(cval->mixer->chip);
+        if (err < 0)
+                return -EIO;
         while (timeout-- > 0) {
                 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
                                     validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
                                     buf, val_len, 100) >= val_len) {
                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
+                        snd_usb_autosuspend(cval->mixer->chip);
                         return 0;
                 }
         }
+        snd_usb_autosuspend(cval->mixer->chip);
         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
                     request, validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), cval->val_type);
         return -EINVAL;
@@ -328,12 +335,18 @@ static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int v
 
         memset(buf, 0, sizeof(buf));
 
+        ret = snd_usb_autoresume(chip) ? -EIO : 0;
+        if (ret)
+                goto error;
+
         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
                               validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
                               buf, size, 1000);
+        snd_usb_autosuspend(chip);
 
         if (ret < 0) {
+error:
                 snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
                            request, validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), cval->val_type);
                 return ret;
@@ -413,7 +426,7 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 {
         struct snd_usb_audio *chip = cval->mixer->chip;
         unsigned char buf[2];
-        int val_len, timeout = 10;
+        int val_len, err, timeout = 10;
 
         if (cval->mixer->protocol == UAC_VERSION_1) {
                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
@@ -433,13 +446,19 @@ int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
         value_set = convert_bytes_value(cval, value_set);
         buf[0] = value_set & 0xff;
         buf[1] = (value_set >> 8) & 0xff;
+        err = snd_usb_autoresume(chip);
+        if (err < 0)
+                return -EIO;
         while (timeout-- > 0)
                 if (snd_usb_ctl_msg(chip->dev,
                                     usb_sndctrlpipe(chip->dev, 0), request,
                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
                                     validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
-                                    buf, val_len, 100) >= 0)
+                                    buf, val_len, 100) >= 0) {
+                        snd_usb_autosuspend(chip);
                         return 0;
+                }
+        snd_usb_autosuspend(chip);
         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
                     request, validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), cval->val_type, buf[0], buf[1]);
         return -EINVAL;
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index e3f680526cb5..b8dcbf407bbb 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -32,6 +32,7 @@
 #include "helper.h"
 #include "pcm.h"
 #include "clock.h"
+#include "power.h"
 
 /*
  * return the current pcm pointer.  just based on the hwptr_done value.
@@ -739,6 +740,9 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
                 pt = 125 * (1 << fp->datainterval);
                 ptmin = min(ptmin, pt);
         }
+        err = snd_usb_autoresume(subs->stream->chip);
+        if (err < 0)
+                return err;
 
         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
@@ -756,21 +760,21 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
                                        SNDRV_PCM_HW_PARAM_CHANNELS,
                                        param_period_time_if_needed,
                                        -1)) < 0)
-                return err;
+                goto rep_err;
         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
                                        hw_rule_channels, subs,
                                        SNDRV_PCM_HW_PARAM_FORMAT,
                                        SNDRV_PCM_HW_PARAM_RATE,
                                        param_period_time_if_needed,
                                        -1)) < 0)
-                return err;
+                goto rep_err;
         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
                                        hw_rule_format, subs,
                                        SNDRV_PCM_HW_PARAM_RATE,
                                        SNDRV_PCM_HW_PARAM_CHANNELS,
                                        param_period_time_if_needed,
                                        -1)) < 0)
-                return err;
+                goto rep_err;
         if (param_period_time_if_needed >= 0) {
                 err = snd_pcm_hw_rule_add(runtime, 0,
                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
@@ -780,11 +784,15 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
                                           SNDRV_PCM_HW_PARAM_RATE,
                                           -1);
                 if (err < 0)
-                        return err;
+                        goto rep_err;
         }
         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
-                return err;
+                goto rep_err;
         return 0;
+
+rep_err:
+        snd_usb_autosuspend(subs->stream->chip);
+        return err;
 }
 
 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
@@ -798,6 +806,7 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
         runtime->hw = snd_usb_hardware;
         runtime->private_data = subs;
         subs->pcm_substream = substream;
+        /* runtime PM is also done there */
         return setup_hw_info(runtime, subs);
 }
 
@@ -811,6 +820,7 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
                 subs->interface = -1;
         }
         subs->pcm_substream = NULL;
+        snd_usb_autosuspend(subs->stream->chip);
         return 0;
 }
 
diff --git a/sound/usb/power.h b/sound/usb/power.h
new file mode 100644
index 000000000000..48ee51dcb71e
--- /dev/null
+++ b/sound/usb/power.h
@@ -0,0 +1,17 @@
+#ifndef __USBAUDIO_POWER_H
+#define __USBAUDIO_POWER_H
+
+#ifdef CONFIG_PM
+int snd_usb_autoresume(struct snd_usb_audio *chip);
+void snd_usb_autosuspend(struct snd_usb_audio *chip);
+#else
+static inline int snd_usb_autoresume(struct snd_usb_audio *chip)
+{
+        return 0;
+}
+static inline void snd_usb_autosuspend(struct snd_usb_audio *chip)
+{
+}
+#endif
+
+#endif /* __USBAUDIO_POWER_H */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 6e66fffe87f5..32f2a97f2f14 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -34,10 +34,14 @@ struct snd_usb_audio {
         int index;
         struct usb_device *dev;
         struct snd_card *card;
+        struct usb_interface *pm_intf;
         u32 usb_id;
-        int shutdown;
         struct mutex shutdown_mutex;
+        unsigned int shutdown:1;
+        unsigned int probing:1;
+        unsigned int autosuspended:1;   
         unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
+        
         int num_interfaces;
         int num_suspended_intf;