From: Arnaud Ferraris <arnaud.ferraris@xxxxxxxxxxxxx>
In order to properly bias headset microphones, there should be a pull-up
resistor between pins HBIAS and MIC2P. This can be an external resistor,
but the codec also provides an internal 2.2K resistor which is enabled
by a register.
This patch enables or disables the internal bias resistor based on a
device tree property.
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@xxxxxxxxxxxxx>
[Samuel: split binding and implementation patches]
Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
---
sound/soc/sunxi/sun50i-codec-analog.c | 29 +++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/sound/soc/sunxi/sun50i-codec-analog.c b/sound/soc/sunxi/sun50i-codec-analog.c
index a41e25ad0aaf..699a5a318875 100644
--- a/sound/soc/sunxi/sun50i-codec-analog.c
+++ b/sound/soc/sunxi/sun50i-codec-analog.c
@@ -117,8 +117,13 @@
#define SUN50I_ADDA_HS_MBIAS_CTRL_MMICBIASEN 7
#define SUN50I_ADDA_JACK_MIC_CTRL 0x1d
+#define SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN 6
#define SUN50I_ADDA_JACK_MIC_CTRL_HMICBIASEN 5
+struct sun50i_codec_analog {
+ bool internal_bias_resistor;
+};
+
/* mixer controls */
static const struct snd_kcontrol_new sun50i_a64_codec_mixer_controls[] = {
SOC_DAPM_DOUBLE_R("Mic1 Playback Switch",
@@ -471,6 +476,18 @@ static const struct snd_soc_dapm_route sun50i_a64_codec_routes[] = {
{ "EARPIECE", NULL, "Earpiece Amp" },
};
+static int sun50i_a64_codec_probe(struct snd_soc_component *component)
+{
+ struct sun50i_codec_analog *codec = snd_soc_component_get_drvdata(component);
+
+ regmap_update_bits(component->regmap, SUN50I_ADDA_JACK_MIC_CTRL,
+ BIT(SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN),
+ codec->internal_bias_resistor <<
+ SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN);
+
+ return 0;
+}
+
static int sun50i_a64_codec_suspend(struct snd_soc_component *component)
{
return regmap_update_bits(component->regmap, SUN50I_ADDA_HP_CTRL,
@@ -491,6 +508,7 @@ static const struct snd_soc_component_driver sun50i_codec_analog_cmpnt_drv = {
.num_dapm_widgets = ARRAY_SIZE(sun50i_a64_codec_widgets),
.dapm_routes = sun50i_a64_codec_routes,
.num_dapm_routes = ARRAY_SIZE(sun50i_a64_codec_routes),
+ .probe = sun50i_a64_codec_probe,
.suspend = sun50i_a64_codec_suspend,
.resume = sun50i_a64_codec_resume,
};
@@ -505,9 +523,20 @@ MODULE_DEVICE_TABLE(of, sun50i_codec_analog_of_match);
static int sun50i_codec_analog_probe(struct platform_device *pdev)
{
+ struct sun50i_codec_analog *codec;
struct regmap *regmap;
void __iomem *base;
+ codec = devm_kzalloc(&pdev->dev, sizeof(*codec), GFP_KERNEL);
+ if (!codec)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, codec);
+
+ codec->internal_bias_resistor =
+ device_property_read_bool(&pdev->dev,
+ "allwinner,internal-bias-resistor");
+
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base)) {
dev_err(&pdev->dev, "Failed to map the registers\n");
--
2.35.1
