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ALSA: hda - Add power on/off counter

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Added the power on/off counter and expose via sysfs files.
The sysfs files, power_on_acct and power_off_acct, are created under
each codec hwdep sysfs directory (e.g. /sys/class/sound/hwC0D0).
The files show the msec length of the codec power-on and power-off,
respectively.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2009-11-11 09:34:25 +01:00
parent 8f217a226c
commit a2f6309e83
4 changed files with 67 additions and 0 deletions
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4
sound/pci/hda/hda_codec.h
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@@ -812,6 +812,9 @@ struct hda_codec {
unsigned int power_transition :1; /* power-state in transition */
int power_count; /* current (global) power refcount */
struct delayed_work power_work; /* delayed task for powerdown */
unsigned long power_on_acct;
unsigned long power_off_acct;
unsigned long power_jiffies;
#endif
/* codec-specific additional proc output */
@@ -936,6 +939,7 @@ const char *snd_hda_get_jack_location(u32 cfg);
void snd_hda_power_up(struct hda_codec *codec);
void snd_hda_power_down(struct hda_codec *codec);
#define snd_hda_codec_needs_resume(codec) codec->power_count
void snd_hda_update_power_acct(struct hda_codec *codec);
#else
static inline void snd_hda_power_up(struct hda_codec *codec) {}
static inline void snd_hda_power_down(struct hda_codec *codec) {}