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authorAndy Owen <andy-alsa@ultra-premium.com>2010-10-23 22:12:29 +1100
committerTakashi Iwai <tiwai@suse.de>2010-10-23 16:58:30 +0200
commit51630142ed7da31618c0aca8f2767824834e18a8 (patch)
treebdb2e8d9af7c5c6c1f71cbead5aca9b56a88b458
parent23156e8faed5df60364976bffea0711a4f38d88a (diff)
downloadlinux-2.6.38-lt-ux500-51630142ed7da31618c0aca8f2767824834e18a8.tar.gz
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>
-rw-r--r--sound/pci/ca0106/ca0106_main.c39
1 files changed, 27 insertions, 12 deletions
diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c
index 6dc9a5d01af..22d2f6b6a05 100644
--- a/sound/pci/ca0106/ca0106_main.c
+++ b/sound/pci/ca0106/ca0106_main.c
@@ -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;
}