ALSA: cs5535audio: turn off PCM properly if closing the audio device

As per <http://dev.laptop.org/ticket/1420>, we need to properly turn off
the PCM if we're closing the device in order to save power.  This also
causes the MIC led to turn off properly.

Signed-off-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 15 insertions, 1 deletions

diff --git a/sound/pci/cs5535audio/cs5535audio.c b/sound/pci/cs5535audio/cs5535audio.c
index 1d8b16052535..6c886edd06db 100644
--- a/sound/pci/cs5535audio/cs5535audio.c
+++ b/sound/pci/cs5535audio/cs5535audio.c
@@ -159,7 +159,8 @@ static int __devinit snd_cs5535audio_mixer(struct cs5535audio *cs5535au)
                 return err;
 
         memset(&ac97, 0, sizeof(ac97));
-        ac97.scaps = AC97_SCAP_AUDIO|AC97_SCAP_SKIP_MODEM;
+        ac97.scaps = AC97_SCAP_AUDIO | AC97_SCAP_SKIP_MODEM
+                        | AC97_SCAP_POWER_SAVE;
         ac97.private_data = cs5535au;
         ac97.pci = cs5535au->pci;
 
diff --git a/sound/pci/cs5535audio/cs5535audio.h b/sound/pci/cs5535audio/cs5535audio.h
index 66bae7664193..57e9c65e6854 100644
--- a/sound/pci/cs5535audio/cs5535audio.h
+++ b/sound/pci/cs5535audio/cs5535audio.h
@@ -78,6 +78,7 @@ struct cs5535audio_dma {
         unsigned int buf_addr, buf_bytes;
         unsigned int period_bytes, periods;
         u32 saved_prd;
+        int pcm_open_flag;
 };
 
 struct cs5535audio {
diff --git a/sound/pci/cs5535audio/cs5535audio_pcm.c b/sound/pci/cs5535audio/cs5535audio_pcm.c
index cdcda87116c3..6aa0c19390d7 100644
--- a/sound/pci/cs5535audio/cs5535audio_pcm.c
+++ b/sound/pci/cs5535audio/cs5535audio_pcm.c
@@ -260,6 +260,9 @@ static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
         err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
                                             params_periods(hw_params),
                                             params_period_bytes(hw_params));
+        if (!err)
+                dma->pcm_open_flag = 1;
+
         return err;
 }
 
@@ -268,6 +271,15 @@ static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
         struct cs5535audio_dma *dma = substream->runtime->private_data;
 
+        if (dma->pcm_open_flag) {
+                if (substream == cs5535au->playback_substream)
+                        snd_ac97_update_power(cs5535au->ac97,
+                                        AC97_PCM_FRONT_DAC_RATE, 0);
+                else
+                        snd_ac97_update_power(cs5535au->ac97,
+                                        AC97_PCM_LR_ADC_RATE, 0);
+                dma->pcm_open_flag = 0;
+        }
         cs5535audio_clear_dma_packets(cs5535au, dma, substream);
         return snd_pcm_lib_free_pages(substream);
 }