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Subject[PATCH 2/4] ALSA: cs5535audio: turn off PCM properly if closing the audio device
From: Jaya Kumar <jayakumar.lkml@gmail.com>

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>
---
sound/pci/cs5535audio/cs5535audio.c | 3 ++-
sound/pci/cs5535audio/cs5535audio.h | 1 +
sound/pci/cs5535audio/cs5535audio_pcm.c | 12 ++++++++++++
3 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/sound/pci/cs5535audio/cs5535audio.c b/sound/pci/cs5535audio/cs5535audio.c
index 1d8b160..6c886ed 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 66bae76..57e9c65 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 cdcda87..6aa0c19 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);
}
--
1.5.6.5


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