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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>
This commit is contained in:
Jaya Kumar 2008-11-05 17:30:08 -05:00 committed by Takashi Iwai
parent 0bed7b292d
commit b035ce0f26
3 changed files with 15 additions and 1 deletions
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3
sound/pci/cs5535audio/cs5535audio.c
View File

@ -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;

1
sound/pci/cs5535audio/cs5535audio.h
View File

@ -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 {

12
sound/pci/cs5535audio/cs5535audio_pcm.c
View File

@ -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);
}