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ALSA: ca0106: Pull out dac powering routine into separate function. 

This is ground work for a future commit where cards (such as the Sound
Blaster 5.1vx) have different mappings between dacs and channels.

Signed-off-by: Andy Owen <andy-alsa@ultra-premium.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andy Owen 2010-10-23 22:12:29 +11:00 committed by Takashi Iwai
parent 23156e8fae
commit 51630142ed
1 changed files with 27 additions and 12 deletions
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39
sound/pci/ca0106/ca0106_main.c
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@ -514,6 +514,23 @@ static void restore_spdif_bits(struct snd_ca0106 *chip, int idx)
}
}
static int snd_ca0106_pcm_power_dac(struct snd_ca0106 *chip, int channel_id,
int power)
{
if (chip->details->spi_dac) {
const int reg = spi_dacd_reg[channel_id];
if (power)
/* Power up */
chip->spi_dac_reg[reg] &= ~spi_dacd_bit[channel_id];
else
/* Power down */
chip->spi_dac_reg[reg] |= spi_dacd_bit[channel_id];
return snd_ca0106_spi_write(chip, chip->spi_dac_reg[reg]);
}
return 0;
}
/* open_playback callback */
static int snd_ca0106_pcm_open_playback_channel(struct snd_pcm_substream *substream,
int channel_id)
@ -553,12 +570,9 @@ static int snd_ca0106_pcm_open_playback_channel(struct snd_pcm_substream *substr
return err;
snd_pcm_set_sync(substream);
if (chip->details->spi_dac && channel_id != PCM_FRONT_CHANNEL) {
const int reg = spi_dacd_reg[channel_id];
/* Power up dac */
chip->spi_dac_reg[reg] &= ~spi_dacd_bit[channel_id];
err = snd_ca0106_spi_write(chip, chip->spi_dac_reg[reg]);
/* Front channel dac should already be on */
if (channel_id != PCM_FRONT_CHANNEL) {
err = snd_ca0106_pcm_power_dac(chip, channel_id, 1);
if (err < 0)
return err;
}
@ -578,13 +592,14 @@ static int snd_ca0106_pcm_close_playback(struct snd_pcm_substream *substream)
restore_spdif_bits(chip, epcm->channel_id);
if (chip->details->spi_dac && epcm->channel_id != PCM_FRONT_CHANNEL) {
const int reg = spi_dacd_reg[epcm->channel_id];
/* Power down DAC */
chip->spi_dac_reg[reg] |= spi_dacd_bit[epcm->channel_id];
snd_ca0106_spi_write(chip, chip->spi_dac_reg[reg]);
/* Front channel dac should stay on */
if (epcm->channel_id != PCM_FRONT_CHANNEL) {
int err;
err = snd_ca0106_pcm_power_dac(chip, epcm->channel_id, 0);
if (err < 0)
return err;
}
/* FIXME: maybe zero others */
return 0;
}