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>

diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c
index 6dc9a5d..22d2f6b 100644 (file)
--- 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;
 }