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ALSA: hda - Add power on/off counter 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
sound/pci/hda/hda_codec.c
View File

@ -515,6 +515,7 @@ static int snd_hda_bus_dev_register(struct snd_device *device)
struct hda_codec *codec;
list_for_each_entry(codec, &bus->codec_list, list) {
snd_hda_hwdep_add_sysfs(codec);
snd_hda_hwdep_add_power_sysfs(codec);
}
return 0;
}
@ -2452,9 +2453,11 @@ static void hda_call_codec_suspend(struct hda_codec *codec)
codec->afg ? codec->afg : codec->mfg,
AC_PWRST_D3);
#ifdef CONFIG_SND_HDA_POWER_SAVE
snd_hda_update_power_acct(codec);
cancel_delayed_work(&codec->power_work);
codec->power_on = 0;
codec->power_transition = 0;
codec->power_jiffies = jiffies;
#endif
}
@ -3191,6 +3194,17 @@ static void hda_keep_power_on(struct hda_codec *codec)
{
codec->power_count++;
codec->power_on = 1;
codec->power_jiffies = jiffies;
}
void snd_hda_update_power_acct(struct hda_codec *codec)
{
unsigned long delta = jiffies - codec->power_jiffies;
if (codec->power_on)
codec->power_on_acct += delta;
else
codec->power_off_acct += delta;
codec->power_jiffies += delta;
}
void snd_hda_power_up(struct hda_codec *codec)
@ -3201,7 +3215,9 @@ void snd_hda_power_up(struct hda_codec *codec)
if (codec->power_on || codec->power_transition)
return;
snd_hda_update_power_acct(codec);
codec->power_on = 1;
codec->power_jiffies = jiffies;
if (bus->ops.pm_notify)
bus->ops.pm_notify(bus);
hda_call_codec_resume(codec);

4
sound/pci/hda/hda_codec.h
View File

@ -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) {}

38
sound/pci/hda/hda_hwdep.c
View File

@ -154,6 +154,44 @@ int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
return 0;
}
#ifdef CONFIG_SND_HDA_POWER_SAVE
static ssize_t power_on_acct_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct snd_hwdep *hwdep = dev_get_drvdata(dev);
struct hda_codec *codec = hwdep->private_data;
snd_hda_update_power_acct(codec);
return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
}
static ssize_t power_off_acct_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct snd_hwdep *hwdep = dev_get_drvdata(dev);
struct hda_codec *codec = hwdep->private_data;
snd_hda_update_power_acct(codec);
return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
}
static struct device_attribute power_attrs[] = {
__ATTR_RO(power_on_acct),
__ATTR_RO(power_off_acct),
};
int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)
{
struct snd_hwdep *hwdep = codec->hwdep;
int i;
for (i = 0; i < ARRAY_SIZE(power_attrs); i++)
snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
hwdep->device, &power_attrs[i]);
return 0;
}
#endif /* CONFIG_SND_HDA_POWER_SAVE */
#ifdef CONFIG_SND_HDA_RECONFIG
/*

9
sound/pci/hda/hda_local.h
View File

@ -437,6 +437,15 @@ int snd_hda_create_hwdep(struct hda_codec *codec);
static inline int snd_hda_create_hwdep(struct hda_codec *codec) { return 0; }
#endif
#ifdef CONFIG_SND_HDA_POWER_SAVE
int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec);
#else
static inline int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)
{
return 0;
}
#endif
#ifdef CONFIG_SND_HDA_RECONFIG
int snd_hda_hwdep_add_sysfs(struct hda_codec *codec);
#else