Some devices use a headset mic bias supply (sometimes referred to as "ear mic bias") to enable/disable the headset mic.

Add a REGULATOR_SUPPLY widget for this supply which gets the headset- mic-bias supply and is routed to the Headset Mic switch similar to how it's done for the other mic bias regulators.

Signed-off-by: Artur Weber aweber.kernel@gmail.com --- Changes in v4: - Completely changed to adapt to SND_SOC_DAPM_REGULATOR_SUPPLY switch Changes in v2: - Added this commit --- sound/soc/samsung/midas_wm1811.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/sound/soc/samsung/midas_wm1811.c b/sound/soc/samsung/midas_wm1811.c index 20b274734487..96cec8e9de98 100644 --- a/sound/soc/samsung/midas_wm1811.c +++ b/sound/soc/samsung/midas_wm1811.c @@ -237,6 +237,7 @@ static const struct snd_soc_dapm_widget midas_dapm_widgets[] = {

SND_SOC_DAPM_HP("Headphone", NULL), SND_SOC_DAPM_MIC("Headset Mic", NULL), + SND_SOC_DAPM_REGULATOR_SUPPLY("headset-mic-bias", 0, 0), SND_SOC_DAPM_MIC("Main Mic", NULL), SND_SOC_DAPM_REGULATOR_SUPPLY("mic-bias", 0, 0), SND_SOC_DAPM_MIC("Sub Mic", NULL), @@ -248,6 +249,7 @@ static const struct snd_soc_dapm_route midas_dapm_routes[] = { /* Bind microphones with their respective regulator supplies */ {"Main Mic", NULL, "mic-bias"}, {"Sub Mic", NULL, "submic-bias"}, + {"Headset Mic", NULL, "headset-mic-bias"}, };

static int midas_set_bias_level(struct snd_soc_card *card,

Some Samsung devices that use the midas_wm1811 driver use a GPIO-based method for detecting whether the headset jack is plugged in, as well as detecting which headset buttons are pressed. There are two GPIOs: a "headset detect" GPIO responsible for detecting jack insertion, and a "headset key" GPIO which triggers when a button on the headset is pressed. The plug type and the button pressed are determined based on information from an ADC channel. The headset mic is enabled by a headset mic bias regulator.

Add support for the GPIO-based headset jack detection mechanism, and make it configurable from the device tree.

This implementation borrows somewhat from the aries_wm8994.c driver, though there are a few changes to make the code cleaner, and to add support for DT-based configuration.

Notably, a dependency on IIO is introduced, to accommodate the ADC reading requirement.

Signed-off-by: Artur Weber aweber.kernel@gmail.com --- Changes in v4: - Adapted to regulators being changed to use SND_SOC_DAPM_REGULATOR_SUPPLY Changes in v2: - Added separate headset mic bias regulator - Added samsung preset to threshold properties - Replaced dev_err+return with return dev_err_probe where needed --- sound/soc/samsung/Kconfig | 2 +- sound/soc/samsung/midas_wm1811.c | 272 +++++++++++++++++++++++++++++++++++++-- 2 files changed, 263 insertions(+), 11 deletions(-)

diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig index 93c2b1b08d0a..4b1ea7b2c796 100644 --- a/sound/soc/samsung/Kconfig +++ b/sound/soc/samsung/Kconfig @@ -140,7 +140,7 @@ config SND_SOC_SAMSUNG_ARIES_WM8994

config SND_SOC_SAMSUNG_MIDAS_WM1811 tristate "SoC I2S Audio support for Midas boards" - depends on SND_SOC_SAMSUNG + depends on SND_SOC_SAMSUNG && IIO select SND_SAMSUNG_I2S select SND_SOC_WM8994 help diff --git a/sound/soc/samsung/midas_wm1811.c b/sound/soc/samsung/midas_wm1811.c index 96cec8e9de98..88fa9e5bc093 100644 --- a/sound/soc/samsung/midas_wm1811.c +++ b/sound/soc/samsung/midas_wm1811.c @@ -7,7 +7,9 @@

#include <linux/clk.h> #include <linux/gpio/consumer.h> +#include <linux/iio/consumer.h> #include <linux/mfd/wm8994/registers.h> +#include <linux/input-event-codes.h> #include <linux/module.h> #include <linux/of.h> #include <sound/jack.h> @@ -28,6 +30,9 @@ struct midas_priv { struct gpio_desc *gpio_fm_sel; struct gpio_desc *gpio_lineout_sel; + struct gpio_desc *gpio_headset_detect; + struct gpio_desc *gpio_headset_key; + struct iio_channel *adc_headset_detect; unsigned int fll1_rate;

struct snd_soc_jack headset_jack; @@ -44,6 +49,117 @@ static struct snd_soc_jack_pin headset_jack_pins[] = { }, };

+/* + * min_mv/max_mv values in this struct are set up based on DT values. + */ +static struct snd_soc_jack_zone headset_jack_zones[] = { + { .jack_type = SND_JACK_HEADPHONE, }, + { .jack_type = SND_JACK_HEADSET, }, + { .jack_type = SND_JACK_HEADPHONE, }, +}; + +/* + * This is used for manual detection in headset_key_check, we reuse the + * structure since it's convenient. + * + * min_mv/max_mv values in this struct are set up based on DT values. + */ +static struct snd_soc_jack_zone headset_key_zones[] = { + { .jack_type = SND_JACK_BTN_0, }, /* Media */ + { .jack_type = SND_JACK_BTN_1, }, /* Volume Up */ + { .jack_type = SND_JACK_BTN_2, }, /* Volume Down */ +}; + +static int headset_jack_check(void *data) +{ + struct snd_soc_component *codec = data; + struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(codec); + struct midas_priv *priv = snd_soc_card_get_drvdata(codec->card); + int adc, ret; + int jack_type = 0; + + if (!gpiod_get_value_cansleep(priv->gpio_headset_detect)) + return 0; + + /* Enable headset mic bias regulator so that the ADC reading works */ + ret = snd_soc_dapm_force_enable_pin(dapm, "headset-mic-bias"); + if (ret < 0) { + pr_err("%s: Failed to enable headset mic bias regulator (%d), assuming headphones\n", + __func__, ret); + return SND_JACK_HEADPHONE; + } + snd_soc_dapm_sync(dapm); + + /* Sleep for a small amount of time to get the value to stabilize */ + msleep(20); + + ret = iio_read_channel_processed(priv->adc_headset_detect, &adc); + if (ret) { + pr_err("%s: Failed to read ADC (%d), assuming headphones\n", + __func__, ret); + jack_type = SND_JACK_HEADPHONE; + goto out; + } + pr_debug("%s: ADC value is %d\n", __func__, adc); + + jack_type = snd_soc_jack_get_type(&priv->headset_jack, adc); + +out: + ret = snd_soc_dapm_disable_pin(dapm, "headset-mic-bias"); + if (ret < 0) + pr_err("%s: Failed to disable headset mic bias regulator (%d)\n", + __func__, ret); + snd_soc_dapm_sync(dapm); + + return jack_type; +} + +static int headset_key_check(void *data) +{ + struct snd_soc_component *codec = data; + struct midas_priv *priv = snd_soc_card_get_drvdata(codec->card); + int adc, i, ret; + + if (!gpiod_get_value_cansleep(priv->gpio_headset_key)) + return 0; + + /* Filter out keypresses when 4 pole jack not detected */ + if (!(priv->headset_jack.status & SND_JACK_MICROPHONE)) + return 0; + + ret = iio_read_channel_processed(priv->adc_headset_detect, &adc); + if (ret) { + pr_err("%s: Failed to read ADC (%d), can't detect key type\n", + __func__, ret); + return 0; + } + pr_debug("%s: ADC value is %d\n", __func__, adc); + + for (i = 0; i < ARRAY_SIZE(headset_key_zones); i++) { + if (adc >= headset_key_zones[i].min_mv && + adc <= headset_key_zones[i].max_mv) { + return headset_key_zones[i].jack_type; + } + } + + return 0; +} + +static struct snd_soc_jack_gpio headset_gpio[] = { + { + .name = "Headset Jack", + .report = SND_JACK_HEADSET, + .debounce_time = 150, + .jack_status_check = headset_jack_check, + }, + { + .name = "Headset Key", + .report = SND_JACK_BTN_0 | SND_JACK_BTN_1 | SND_JACK_BTN_2, + .debounce_time = 30, + .jack_status_check = headset_key_check, + }, +}; + static int midas_start_fll1(struct snd_soc_pcm_runtime *rtd, unsigned int rate) { struct snd_soc_card *card = rtd->card; @@ -291,18 +407,67 @@ static int midas_late_probe(struct snd_soc_card *card) return ret; }

- ret = snd_soc_card_jack_new_pins(card, "Headset", - SND_JACK_HEADSET | SND_JACK_MECHANICAL | - SND_JACK_BTN_0 | SND_JACK_BTN_1 | SND_JACK_BTN_2 | - SND_JACK_BTN_3 | SND_JACK_BTN_4 | SND_JACK_BTN_5, - &priv->headset_jack, - headset_jack_pins, - ARRAY_SIZE(headset_jack_pins)); - if (ret) + if (!priv->gpio_headset_detect) { + ret = snd_soc_card_jack_new_pins(card, "Headset", + SND_JACK_HEADSET | SND_JACK_MECHANICAL | + SND_JACK_BTN_0 | SND_JACK_BTN_1 | + SND_JACK_BTN_2 | SND_JACK_BTN_3 | + SND_JACK_BTN_4 | SND_JACK_BTN_5, + &priv->headset_jack, + headset_jack_pins, + ARRAY_SIZE(headset_jack_pins)); + if (ret) + return ret; + + wm8958_mic_detect(aif1_dai->component, &priv->headset_jack, + NULL, NULL, NULL, NULL); + } else { + /* Some devices (n8000, t310) use a GPIO to detect the jack. */ + ret = snd_soc_card_jack_new_pins(card, "Headset", + SND_JACK_HEADSET | SND_JACK_BTN_0 | + SND_JACK_BTN_1 | SND_JACK_BTN_2, + &priv->headset_jack, + headset_jack_pins, + ARRAY_SIZE(headset_jack_pins)); + if (ret) { + dev_err(card->dev, + "Failed to set up headset pins: %d\n", ret); + return ret; + } + + ret = snd_soc_jack_add_zones(&priv->headset_jack, + ARRAY_SIZE(headset_jack_zones), + headset_jack_zones); + if (ret) { + dev_err(card->dev, + "Failed to set up headset zones: %d\n", ret); + return ret; + } + + headset_gpio[0].data = aif1_dai->component; + headset_gpio[0].desc = priv->gpio_headset_detect; + + headset_gpio[1].data = aif1_dai->component; + headset_gpio[1].desc = priv->gpio_headset_key; + + snd_jack_set_key(priv->headset_jack.jack, + SND_JACK_BTN_0, KEY_MEDIA); + snd_jack_set_key(priv->headset_jack.jack, + SND_JACK_BTN_1, KEY_VOLUMEUP); + snd_jack_set_key(priv->headset_jack.jack, + SND_JACK_BTN_2, KEY_VOLUMEDOWN); + + ret = snd_soc_jack_add_gpios(&priv->headset_jack, + ARRAY_SIZE(headset_gpio), + headset_gpio); + if (ret) + dev_err(card->dev, + "Failed to set up headset jack GPIOs: %d\n", + ret); + return ret; + }

- wm8958_mic_detect(aif1_dai->component, &priv->headset_jack, - NULL, NULL, NULL, NULL); return 0; }

@@ -411,6 +576,9 @@ static int midas_probe(struct platform_device *pdev) struct snd_soc_card *card = &midas_card; struct device *dev = &pdev->dev; static struct snd_soc_dai_link *dai_link; + enum iio_chan_type channel_type; + u32 fourpole_threshold[2]; + u32 button_threshold[3]; struct midas_priv *priv; int ret, i;

@@ -434,6 +602,90 @@ static int midas_probe(struct platform_device *pdev) return PTR_ERR(priv->gpio_lineout_sel); }

+ priv->gpio_headset_detect = devm_gpiod_get_optional(dev, + "headset-detect", GPIOD_IN); + if (IS_ERR(priv->gpio_headset_detect)) + return dev_err_probe(dev, PTR_ERR(priv->gpio_headset_detect), + "Failed to get headset jack detect GPIO\n"); + + if (priv->gpio_headset_detect) { + priv->adc_headset_detect = devm_iio_channel_get(dev, + "headset-detect"); + if (IS_ERR(priv->adc_headset_detect)) + return dev_err_probe(dev, + PTR_ERR(priv->adc_headset_detect), + "Failed to get ADC channel\n"); + + ret = iio_get_channel_type(priv->adc_headset_detect, + &channel_type); + if (ret) { + dev_err(dev, "Failed to get ADC channel type\n"); + return ret; + } + + if (channel_type != IIO_VOLTAGE) { + dev_err(dev, "ADC channel is not voltage\n"); + return ret; + } + + priv->gpio_headset_key = devm_gpiod_get(dev, "headset-key", + GPIOD_IN); + if (IS_ERR(priv->gpio_headset_key)) + return dev_err_probe(dev, + PTR_ERR(priv->gpio_headset_key), + "Failed to get headset key GPIO\n"); + + ret = of_property_read_u32_array(dev->of_node, + "samsung,headset-4pole-threshold-microvolt", + fourpole_threshold, + ARRAY_SIZE(fourpole_threshold)); + if (ret) { + dev_err(dev, "Failed to get 4-pole jack detection threshold\n"); + return ret; + } + + if (fourpole_threshold[0] > fourpole_threshold[1]) { + dev_err(dev, "Invalid 4-pole jack detection threshold value\n"); + return -EINVAL; + } + + headset_jack_zones[0].max_mv = (fourpole_threshold[0]); + headset_jack_zones[1].min_mv = (fourpole_threshold[0] + 1); + + headset_jack_zones[1].max_mv = (fourpole_threshold[1]); + headset_jack_zones[2].min_mv = (fourpole_threshold[1] + 1); + + ret = of_property_read_u32_array(dev->of_node, + "samsung,headset-button-threshold-microvolt", + button_threshold, + ARRAY_SIZE(button_threshold)); + if (ret) { + dev_err(dev, "Failed to get headset button detection threshold\n"); + return ret; + } + + if (button_threshold[0] > button_threshold[1] || + button_threshold[1] > button_threshold[2]) { + dev_err(dev, "Invalid headset button detection threshold value\n"); + return -EINVAL; + } + + for (i = 0; i < 3; i++) { + if (i != 0 && button_threshold[i] <= 0) { + dev_err(dev, "Invalid headset button detection threshold value\n"); + return -EINVAL; + } + + headset_key_zones[i].min_mv = button_threshold[i]; + + if (i == 2) + headset_key_zones[i].max_mv = UINT_MAX; + else + headset_key_zones[i].max_mv = \ + (button_threshold[i+1] - 1); + } + } + ret = snd_soc_of_parse_card_name(card, "model"); if (ret < 0) { dev_err(dev, "Card name is not specified\n");

Set up headset mic bias regulator and add the necessary properties to the samsung,midas-audio node to allow for headset jack detection.

Signed-off-by: Artur Weber aweber.kernel@gmail.com --- Changes in v2: - Added headset mic bias regulator - Added samsung prefix to threshold properties - Dropped wm1811 config changes --- arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)

diff --git a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi index e5254e32aa8f..8dc81112172c 100644 --- a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi +++ b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi @@ -294,11 +294,30 @@ submic_bias_reg: voltage-regulator-5 { regulator-max-microvolt = <2800000>; };

+ earmic_bias_reg: voltage-regulator-6 { + compatible = "regulator-fixed"; + regulator-name = "EAR_MICBIAS_LDO_2.8V"; + regulator-min-microvolt = <2800000>; + regulator-max-microvolt = <2800000>; + gpio = <&gpm0 0 GPIO_ACTIVE_HIGH>; + enable-active-high; + }; + sound: sound { compatible = "samsung,midas-audio"; model = "TAB3"; mic-bias-supply = <&mic_bias_reg>; submic-bias-supply = <&submic_bias_reg>; + headset-mic-bias-supply = <&earmic_bias_reg>; + + lineout-sel-gpios = <&gpj1 2 GPIO_ACTIVE_HIGH>; + + headset-detect-gpios = <&gpx0 4 GPIO_ACTIVE_LOW>; + headset-key-gpios = <&gpx3 6 GPIO_ACTIVE_LOW>; + samsung,headset-4pole-threshold-microvolt = <710 2000>; + samsung,headset-button-threshold-microvolt = <0 130 260>; + io-channel-names = "headset-detect"; + io-channels = <&adc 0>;

audio-routing = "HP", "HPOUT1L", "HP", "HPOUT1R", @@ -345,6 +364,11 @@ wlan_pwrseq: sdhci3-pwrseq { }; };

+&adc { + vdd-supply = <&ldo3_reg>; + status = "okay"; +}; + &bus_acp { devfreq = <&bus_dmc>; status = "okay";

This was initially copied from the Midas DTSI, but there is no proof that the same interrupt is also used on the Tab 3. The pin listed as the interrupt here is GPIO_HDMI_CEC on the Midas, but for the Tab 3 it is the headset button GPIO - GPIO_EAR_SEND_END.

Drop the interrupt, since there is no proof that it is used.

Signed-off-by: Artur Weber aweber.kernel@gmail.com --- Changes in v3: - Split out from "[PATCH v2 7/7] ARM: dts: samsung: exynos4212-tab3: Fix up wm1811 codec config" --- arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi | 2 -- 1 file changed, 2 deletions(-)

diff --git a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi index 47e9a230f2e8..20e5e7ba6b92 100644 --- a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi +++ b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi @@ -534,8 +534,6 @@ wm1811: audio-codec@1a { clock-names = "MCLK1", "MCLK2"; interrupt-controller; #interrupt-cells = <2>; - interrupt-parent = <&gpx3>; - interrupts = <6 IRQ_TYPE_LEVEL_HIGH>;

gpio-controller; #gpio-cells = <2>;