[ALSA] ca0106: power down SPI DAC channels when not in use
For cards with an SPI DAC (SB Live 24-bit / Audigy SE), power down channels 0-2 when not in use. They are powered up on PCM open and down again on PCM close. Channel 4 (== Front) is not powered down, as it is used for capture feedback. Powering it down would effectively kill line in pass-through. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
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@ -587,7 +587,7 @@
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#define SPI_DACD0_BIT 1
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#define SPI_DACD1_BIT 2
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#define SPI_DACD2_BIT 3
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#define SPI_DACD4_BIT 1
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#define SPI_DACD4_BIT 0 /* datasheet error says it's 1 */
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#define SPI_PWRDNALL_REG 10 /* power down everything */
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#define SPI_PWRDNALL_BIT 4
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@ -1,7 +1,7 @@
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/*
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* Copyright (c) 2004 James Courtier-Dutton <James@superbug.demon.co.uk>
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* Driver CA0106 chips. e.g. Sound Blaster Audigy LS and Live 24bit
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* Version: 0.0.24
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* Version: 0.0.25
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*
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* FEATURES currently supported:
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* Front, Rear and Center/LFE.
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@ -81,6 +81,8 @@
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* Implement support for Line-in capture on SB Live 24bit.
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* 0.0.24
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* Add support for mute control on SB Live 24bit (cards w/ SPI DAC)
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* 0.0.25
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* Powerdown SPI DAC channels when not in use
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*
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* BUGS:
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* Some stability problems when unloading the snd-ca0106 kernel module.
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@ -458,6 +460,19 @@ static void snd_ca0106_pcm_free_substream(struct snd_pcm_runtime *runtime)
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kfree(runtime->private_data);
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}
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static const int spi_dacd_reg[] = {
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[PCM_FRONT_CHANNEL] = SPI_DACD4_REG,
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[PCM_REAR_CHANNEL] = SPI_DACD0_REG,
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[PCM_CENTER_LFE_CHANNEL]= SPI_DACD2_REG,
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[PCM_UNKNOWN_CHANNEL] = SPI_DACD1_REG,
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};
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static const int spi_dacd_bit[] = {
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[PCM_FRONT_CHANNEL] = 1<<SPI_DACD4_BIT,
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[PCM_REAR_CHANNEL] = 1<<SPI_DACD0_BIT,
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[PCM_CENTER_LFE_CHANNEL]= 1<<SPI_DACD2_BIT,
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[PCM_UNKNOWN_CHANNEL] = 1<<SPI_DACD1_BIT,
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};
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/* open_playback callback */
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static int snd_ca0106_pcm_open_playback_channel(struct snd_pcm_substream *substream,
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int channel_id)
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@ -492,6 +507,16 @@ static int snd_ca0106_pcm_open_playback_channel(struct snd_pcm_substream *substr
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return err;
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if ((err = snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64)) < 0)
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return err;
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if (chip->details->spi_dac && channel_id != PCM_FRONT_CHANNEL) {
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const int reg = spi_dacd_reg[channel_id];
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/* Power up dac */
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chip->spi_dac_reg[reg] &= ~spi_dacd_bit[channel_id];
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err = snd_ca0106_spi_write(chip, chip->spi_dac_reg[reg]);
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if (err < 0)
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return err;
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}
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return 0;
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}
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@ -502,6 +527,14 @@ static int snd_ca0106_pcm_close_playback(struct snd_pcm_substream *substream)
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_ca0106_pcm *epcm = runtime->private_data;
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chip->playback_channels[epcm->channel_id].use = 0;
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if (chip->details->spi_dac && epcm->channel_id != PCM_FRONT_CHANNEL) {
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const int reg = spi_dacd_reg[epcm->channel_id];
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/* Power down DAC */
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chip->spi_dac_reg[reg] |= spi_dacd_bit[epcm->channel_id];
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snd_ca0106_spi_write(chip, chip->spi_dac_reg[reg]);
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}
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/* FIXME: maybe zero others */
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return 0;
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}
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@ -1246,7 +1279,7 @@ static unsigned int spi_dac_init[] = {
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0x0530,
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0x0602,
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0x0622,
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0x1400,
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0x140e,
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};
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static unsigned int i2c_adc_init[][2] = {
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