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ALSA: ca0106: Create a nice spot for mapping channels to dacs. 

This is to allow a future patch to have card specific mappings between
dacs, which is required since the Sound Blaster 5.1vx seems to have a
different mapping to what was previously used.

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 22:12:31 +11:00 committed by Takashi Iwai
parent 9bfd94132d
commit 861391d3a0
1 changed files with 29 additions and 11 deletions
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40
sound/pci/ca0106/ca0106_main.c
View File

@ -493,16 +493,18 @@ static void snd_ca0106_pcm_free_substream(struct snd_pcm_runtime *runtime)
}
static const int spi_dacd_reg[] = {
[PCM_FRONT_CHANNEL] = SPI_DACD4_REG,
[PCM_REAR_CHANNEL] = SPI_DACD0_REG,
[PCM_CENTER_LFE_CHANNEL]= SPI_DACD2_REG,
[PCM_UNKNOWN_CHANNEL] = SPI_DACD1_REG,
SPI_DACD0_REG,
SPI_DACD1_REG,
SPI_DACD2_REG,
0,
SPI_DACD4_REG,
};
static const int spi_dacd_bit[] = {
[PCM_FRONT_CHANNEL] = SPI_DACD4_BIT,
[PCM_REAR_CHANNEL] = SPI_DACD0_BIT,
[PCM_CENTER_LFE_CHANNEL]= SPI_DACD2_BIT,
[PCM_UNKNOWN_CHANNEL] = SPI_DACD1_BIT,
SPI_DACD0_BIT,
SPI_DACD1_BIT,
SPI_DACD2_BIT,
0,
SPI_DACD4_BIT,
};
static void restore_spdif_bits(struct snd_ca0106 *chip, int idx)
@ -514,18 +516,34 @@ static void restore_spdif_bits(struct snd_ca0106 *chip, int idx)
}
}
static int snd_ca0106_channel_dac(struct snd_ca0106_details *details,
int channel_id)
{
switch (channel_id) {
case PCM_FRONT_CHANNEL: return 4;
case PCM_REAR_CHANNEL: return 0;
case PCM_CENTER_LFE_CHANNEL: return 2;
case PCM_UNKNOWN_CHANNEL: return 1;
}
snd_printk(KERN_DEBUG "ca0106: unknown channel_id %d\n", channel_id);
return 0;
}
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];
const int dac = snd_ca0106_channel_dac(chip->details,
channel_id);
const int reg = spi_dacd_reg[dac];
const int bit = spi_dacd_bit[dac];
if (power)
/* Power up */
chip->spi_dac_reg[reg] &= ~spi_dacd_bit[channel_id];
chip->spi_dac_reg[reg] &= ~bit;
else
/* Power down */
chip->spi_dac_reg[reg] |= spi_dacd_bit[channel_id];
chip->spi_dac_reg[reg] |= bit;
return snd_ca0106_spi_write(chip, chip->spi_dac_reg[reg]);
}
return 0;