[PATCH v2 2/5] ASoC: cpcap: Implement .set_bias_level

Ivaylo Dimitrov
2025-01-22T16:41:42Z

With VAUDIO regulator being always on, we have to put it in low-power mode
when codec is not in use to decrease power usage.

Do so by implementing driver .set_bias_level callback.

Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
---
sound/soc/codecs/cpcap.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)

diff --git a/sound/soc/codecs/cpcap.c b/sound/soc/codecs/cpcap.c
index 04304a7ad915..53f549ede6a6 100644
--- a/sound/soc/codecs/cpcap.c
+++ b/sound/soc/codecs/cpcap.c
@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
#include <linux/mfd/motorola-cpcap.h>
#include <sound/core.h>
#include <sound/soc.h>
@@ -260,6 +261,7 @@ struct cpcap_audio {
int codec_clk_id;
int codec_freq;
int codec_format;
+ struct regulator *vaudio;
};

static int cpcap_st_workaround(struct snd_soc_dapm_widget *w,
@@ -1637,6 +1639,11 @@ static int cpcap_soc_probe(struct snd_soc_component *component)
snd_soc_component_set_drvdata(component, cpcap);
cpcap->component = component;

+ cpcap->vaudio = devm_regulator_get(component->dev, "VAUDIO");
+ if (IS_ERR(cpcap->vaudio))
+ return dev_err_probe(component->dev, PTR_ERR(cpcap->vaudio),
+ "Cannot get VAUDIO regulator\n");
+
cpcap->regmap = dev_get_regmap(component->dev->parent, NULL);
if (!cpcap->regmap)
return -ENODEV;
@@ -1649,6 +1656,27 @@ static int cpcap_soc_probe(struct snd_soc_component *component)
return cpcap_audio_reset(component, false);
}

+static int cpcap_set_bias_level(struct snd_soc_component *component,
+ enum snd_soc_bias_level level)
+{
+ struct cpcap_audio *cpcap = snd_soc_component_get_drvdata(component);
+
+ switch (level) {
+ case SND_SOC_BIAS_OFF:
+ break;
+ case SND_SOC_BIAS_PREPARE:
+ regulator_set_mode(cpcap->vaudio, REGULATOR_MODE_NORMAL);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ regulator_set_mode(cpcap->vaudio, REGULATOR_MODE_STANDBY);
+ break;
+ case SND_SOC_BIAS_ON:
+ break;
+ }
+
+ return 0;
+}
+
static const struct snd_soc_component_driver soc_codec_dev_cpcap = {
.probe = cpcap_soc_probe,
.controls = cpcap_snd_controls,
@@ -1657,6 +1685,7 @@ static const struct snd_soc_component_driver soc_codec_dev_cpcap = {
.num_dapm_widgets = ARRAY_SIZE(cpcap_dapm_widgets),
.dapm_routes = intercon,
.num_dapm_routes = ARRAY_SIZE(intercon),
+ .set_bias_level = cpcap_set_bias_level,
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
--
2.30.2