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>

1 files changed, 16 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 2b787b013e93..444d9039c1ac 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -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);