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>
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 09e5934..5e47757 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 @@
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 @@
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 @@
{
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 @@
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;