/**
* sta32x_set_bias_level - DAPM callback
* @codec: the codec device
* @level: DAPM power level
*
* This is called by ALSA to put the codec into low power mode
* or to wake it up. If the codec is powered off completely
* all registers must be restored after power on.
*/
static int sta32x_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
int ret;
struct sta32x_priv *sta32x = snd_soc_codec_get_drvdata(codec);
dev_dbg(codec->dev, "level = %d\n", level);
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
/* Full power on */
regmap_update_bits(sta32x->regmap, STA32X_CONFF,
STA32X_CONFF_PWDN | STA32X_CONFF_EAPD,
STA32X_CONFF_PWDN | STA32X_CONFF_EAPD);
break;
case SND_SOC_BIAS_STANDBY:
if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
ret = regulator_bulk_enable(ARRAY_SIZE(sta32x->supplies),
sta32x->supplies);
if (ret != 0) {
dev_err(codec->dev,
"Failed to enable supplies: %d\n", ret);
return ret;
}
sta32x_startup_sequence(sta32x);
sta32x_cache_sync(codec);
sta32x_watchdog_start(sta32x);
}
/* Power down */
regmap_update_bits(sta32x->regmap, STA32X_CONFF,
STA32X_CONFF_PWDN | STA32X_CONFF_EAPD,
0);
break;
case SND_SOC_BIAS_OFF:
/* The chip runs through the power down sequence for us. */
regmap_update_bits(sta32x->regmap, STA32X_CONFF,
STA32X_CONFF_PWDN | STA32X_CONFF_EAPD, 0);
msleep(300);
sta32x_watchdog_stop(sta32x);
if (sta32x->gpiod_nreset)
gpiod_set_value(sta32x->gpiod_nreset, 0);
regulator_bulk_disable(ARRAY_SIZE(sta32x->supplies),
sta32x->supplies);
break;
}
codec->dapm.bias_level = level;
return 0;
}
/* work around ESD issue where sta32x resets and loses all configuration */
static void sta32x_watchdog(struct work_struct *work)
{
struct sta32x_priv *sta32x = container_of(work, struct sta32x_priv,
watchdog_work.work);
struct snd_soc_codec *codec = sta32x->codec;
unsigned int confa, confa_cached;
/* check if sta32x has reset itself */
confa_cached = snd_soc_read(codec, STA32X_CONFA);
codec->cache_bypass = 1;
confa = snd_soc_read(codec, STA32X_CONFA);
codec->cache_bypass = 0;
if (confa != confa_cached) {
codec->cache_sync = 1;
sta32x_cache_sync(codec);
}
if (!sta32x->shutdown)
schedule_delayed_work(&sta32x->watchdog_work,
round_jiffies_relative(HZ));
}
/* work around ESD issue where sta32x resets and loses all configuration */
static void sta32x_watchdog(struct work_struct *work)
{
struct sta32x_priv *sta32x = container_of(work, struct sta32x_priv,
watchdog_work.work);
struct snd_soc_codec *codec = sta32x->codec;
unsigned int confa, confa_cached;
/* check if sta32x has reset itself */
confa_cached = snd_soc_read(codec, STA32X_CONFA);
regcache_cache_bypass(sta32x->regmap, true);
confa = snd_soc_read(codec, STA32X_CONFA);
regcache_cache_bypass(sta32x->regmap, false);
if (confa != confa_cached) {
regcache_mark_dirty(sta32x->regmap);
sta32x_cache_sync(codec);
}
if (!sta32x->shutdown)
queue_delayed_work(system_power_efficient_wq,
&sta32x->watchdog_work,
round_jiffies_relative(HZ));
}