4 files changed, 67 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);
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index cbf199a98ab2..b16678cade18 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -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) {}
diff --git a/sound/pci/hda/hda_hwdep.c b/sound/pci/hda/hda_hwdep.c
index cc24e6721d74..d24328661c6a 100644
--- a/sound/pci/hda/hda_hwdep.c
+++ b/sound/pci/hda/hda_hwdep.c
@@ -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
 
 /*
diff --git a/sound/pci/hda/hda_local.h b/sound/pci/hda/hda_local.h
index 461e0c15c77a..015fbac914b3 100644
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -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