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>
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3 changed files with 15 additions and 1 deletions
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@ -159,7 +159,8 @@ static int __devinit snd_cs5535audio_mixer(struct cs5535audio *cs5535au)
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return err;
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memset(&ac97, 0, sizeof(ac97));
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ac97.scaps = AC97_SCAP_AUDIO|AC97_SCAP_SKIP_MODEM;
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ac97.scaps = AC97_SCAP_AUDIO | AC97_SCAP_SKIP_MODEM
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| AC97_SCAP_POWER_SAVE;
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ac97.private_data = cs5535au;
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ac97.pci = cs5535au->pci;
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@ -78,6 +78,7 @@ struct cs5535audio_dma {
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unsigned int buf_addr, buf_bytes;
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unsigned int period_bytes, periods;
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u32 saved_prd;
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int pcm_open_flag;
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};
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struct cs5535audio {
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@ -260,6 +260,9 @@ static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
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err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
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params_periods(hw_params),
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params_period_bytes(hw_params));
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if (!err)
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dma->pcm_open_flag = 1;
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return err;
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}
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@ -268,6 +271,15 @@ static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
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struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
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struct cs5535audio_dma *dma = substream->runtime->private_data;
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if (dma->pcm_open_flag) {
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if (substream == cs5535au->playback_substream)
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snd_ac97_update_power(cs5535au->ac97,
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AC97_PCM_FRONT_DAC_RATE, 0);
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else
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snd_ac97_update_power(cs5535au->ac97,
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AC97_PCM_LR_ADC_RATE, 0);
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dma->pcm_open_flag = 0;
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}
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cs5535audio_clear_dma_packets(cs5535au, dma, substream);
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return snd_pcm_lib_free_pages(substream);
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}
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