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[ALSA] snd-bt87x: Power down audio ADC when not in use 

Sets a bit to power down the Bt87x's internal audio ADC when the ALSA device
isn't open, or when it is in 'digital mode' using an external ADC.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Trent Piepho 2007-09-07 13:18:50 +02:00 committed by Jaroslav Kysela
parent 57bd68b8b1
commit 950fb626dc
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sound/pci/bt87x.c
View File

@ -377,7 +377,7 @@ static struct snd_pcm_hardware snd_bt87x_analog_hw = {
static int snd_bt87x_set_digital_hw(struct snd_bt87x *chip, struct snd_pcm_runtime *runtime)
{
chip->reg_control |= CTL_DA_IOM_DA;
chip->reg_control |= CTL_DA_IOM_DA | CTL_A_PWRDN;
runtime->hw = snd_bt87x_digital_hw;
runtime->hw.rates = snd_pcm_rate_to_rate_bit(chip->board.dig_rate);
runtime->hw.rate_min = chip->board.dig_rate;
@ -398,7 +398,7 @@ static int snd_bt87x_set_analog_hw(struct snd_bt87x *chip, struct snd_pcm_runtim
.rats = &analog_clock
};
chip->reg_control &= ~CTL_DA_IOM_DA;
chip->reg_control &= ~(CTL_DA_IOM_DA | CTL_A_PWRDN);
runtime->hw = snd_bt87x_analog_hw;
return snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
&constraint_rates);
@ -437,6 +437,11 @@ static int snd_bt87x_close(struct snd_pcm_substream *substream)
{
struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
spin_lock_irq(&chip->reg_lock);
chip->reg_control |= CTL_A_PWRDN;
snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
spin_unlock_irq(&chip->reg_lock);
chip->substream = NULL;
clear_bit(0, &chip->opened);
smp_mb__after_clear_bit();
@ -751,7 +756,8 @@ static int __devinit snd_bt87x_create(struct snd_card *card,
goto fail;
}
chip->reg_control = CTL_DA_ES2 | CTL_PKTP_16 | (15 << CTL_DA_SDR_SHIFT);
chip->reg_control = CTL_A_PWRDN | CTL_DA_ES2 |
CTL_PKTP_16 | (15 << CTL_DA_SDR_SHIFT);
chip->interrupt_mask = MY_INTERRUPTS;
snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
snd_bt87x_writel(chip, REG_INT_MASK, 0);