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ASoC: Clean up WM8731 bias level configuration 

The WM8731 bias level configuration function was written slightly
obscurely - streamline the code a little and refresh the comments.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-02-16 19:20:15 +00:00
parent 7b317b692a
commit 22d22ee514
1 changed files with 3 additions and 5 deletions
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8
sound/soc/codecs/wm8731.c
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@ -396,21 +396,19 @@ static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai,
static int wm8731_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
u16 reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
u16 reg;
switch (level) {
case SND_SOC_BIAS_ON:
/* vref/mid, osc on, dac unmute */
wm8731_write(codec, WM8731_PWR, reg);
break;
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
/* everything off except vref/vmid, */
/* Clear PWROFF, gate CLKOUT, everything else as-is */
reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f;
wm8731_write(codec, WM8731_PWR, reg | 0x0040);
break;
case SND_SOC_BIAS_OFF:
/* everything off, dac mute, inactive */
wm8731_write(codec, WM8731_ACTIVE, 0x0);
wm8731_write(codec, WM8731_PWR, 0xffff);
break;