From: Arnaud Ferraris arnaud.ferraris@collabora.com
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@collabora.com [Samuel: split binding and implementation patches] Signed-off-by: Samuel Holland samuel@sholland.org ---
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");