MLK-11479-06 ASoC: fsl: Add WM8962 jack detecting support

cherry-pick below patch from v3.14.y:
ENGR00277715-3 ASoC: fsl: Add WM8962 jack detecting support

There're two GPIOs connected to the headphone jack and microphone jack,
thus add the states detection.

Reviewed-by: Wang Shengjiu <b02247@freescale.com>
Signed-off-by: Nicolin Chen <b42378@freescale.com>

Documentation/devicetree/bindings/sound/imx-audio-wm8962.txt

@@ -31,6 +31,12 @@ Required properties:
 Note: The AUDMUX port numbering should start at 1, which is consistent with
 hardware manual.
 
+Optional properties:
+- hp-det-gpios : The gpio pin to detect plug in/out event that happens to
+  Headphone jack.
+- mic-det-gpios: The gpio pin to detect plug in/out event that happens to
+  Microphone jack.
+
 Example:
 
 sound {
@@ -50,4 +56,6 @@ sound {
 		"DMICDAT", "DMIC";
 	mux-int-port = <2>;
 	mux-ext-port = <3>;
+	hp-det-gpios = <&gpio7 8 1>;
+	mic-det-gpios = <&gpio1 9 1>;
 };

Documentation/devicetree/bindings/sound/wm8962.txt

@@ -13,6 +13,14 @@ Optional properties:
     of R51 (Class D Control 2) gets set, indicating that the speaker is
     in mono mode.
 
+  - amic-mono: This is a boolean property. If present, indicating that the
+    analog micphone is hardware mono input, the driver would enable monomix
+    for it.
+
+  - dmic-mono: This is a boolean property. If present, indicating that the
+    digital micphone is hardware mono input, the driver would enable monomix
+    for it.
+
   - mic-cfg : Default register value for R48 (Additional Control 4).
     If absent, the default should be the register default.
 

sound/soc/fsl/imx-wm8962.c

@@ -16,9 +16,12 @@
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/i2c.h>
+#include <linux/of_gpio.h>
 #include <linux/slab.h>
+#include <linux/gpio.h>
 #include <linux/clk.h>
 #include <sound/soc.h>
+#include <sound/jack.h>
 #include <sound/pcm_params.h>
 #include <sound/soc-dapm.h>
 #include <linux/pinctrl/consumer.h>
@@ -37,12 +40,130 @@ struct imx_wm8962_data {
 };
 
 struct imx_priv {
+	int hp_gpio;
+	int hp_active_low;
+	int mic_gpio;
+	int mic_active_low;
+	bool amic_mono;
+	bool dmic_mono;
+	struct snd_soc_codec *codec;
 	struct platform_device *pdev;
 	struct snd_pcm_substream *first_stream;
 	struct snd_pcm_substream *second_stream;
 };
 static struct imx_priv card_priv;
 
+static struct snd_soc_jack imx_hp_jack;
+static struct snd_soc_jack_pin imx_hp_jack_pins[] = {
+	{
+		.pin = "Headphone Jack",
+		.mask = SND_JACK_HEADPHONE,
+	},
+};
+static struct snd_soc_jack_gpio imx_hp_jack_gpio = {
+	.name = "headphone detect",
+	.report = SND_JACK_HEADPHONE,
+	.debounce_time = 250,
+	.invert = 0,
+};
+
+static struct snd_soc_jack imx_mic_jack;
+static struct snd_soc_jack_pin imx_mic_jack_pins[] = {
+	{
+		.pin = "AMIC",
+		.mask = SND_JACK_MICROPHONE,
+	},
+};
+static struct snd_soc_jack_gpio imx_mic_jack_gpio = {
+	.name = "microphone detect",
+	.report = SND_JACK_MICROPHONE,
+	.debounce_time = 250,
+	.invert = 0,
+};
+
+static int hpjack_status_check(void *data)
+{
+	struct imx_priv *priv = &card_priv;
+	struct platform_device *pdev = priv->pdev;
+	char *envp[3], *buf;
+	int hp_status, ret;
+
+	if (!gpio_is_valid(priv->hp_gpio))
+		return 0;
+
+	hp_status = gpio_get_value(priv->hp_gpio) ? 1 : 0;
+
+	buf = kmalloc(32, GFP_ATOMIC);
+	if (!buf) {
+		dev_err(&pdev->dev, "%s kmalloc failed\n", __func__);
+		return -ENOMEM;
+	}
+
+	if (hp_status != priv->hp_active_low) {
+		snprintf(buf, 32, "STATE=%d", 2);
+		snd_soc_dapm_disable_pin(snd_soc_codec_get_dapm(priv->codec), "Ext Spk");
+		ret = imx_hp_jack_gpio.report;
+	} else {
+		snprintf(buf, 32, "STATE=%d", 0);
+		snd_soc_dapm_enable_pin(snd_soc_codec_get_dapm(priv->codec), "Ext Spk");
+		ret = 0;
+	}
+
+	envp[0] = "NAME=headphone";
+	envp[1] = buf;
+	envp[2] = NULL;
+	kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
+	kfree(buf);
+
+	return ret;
+}
+
+static int micjack_status_check(void *data)
+{
+	struct imx_priv *priv = &card_priv;
+	struct platform_device *pdev = priv->pdev;
+	char *envp[3], *buf;
+	int mic_status, ret;
+
+	if (!gpio_is_valid(priv->mic_gpio))
+		return 0;
+
+	mic_status = gpio_get_value(priv->mic_gpio) ? 1 : 0;
+
+	if ((mic_status != priv->mic_active_low && priv->amic_mono)
+		|| (mic_status == priv->mic_active_low && priv->dmic_mono))
+		snd_soc_update_bits(priv->codec, WM8962_THREED1,
+				WM8962_ADC_MONOMIX_MASK, WM8962_ADC_MONOMIX);
+	else
+		snd_soc_update_bits(priv->codec, WM8962_THREED1,
+				WM8962_ADC_MONOMIX_MASK, 0);
+
+	buf = kmalloc(32, GFP_ATOMIC);
+	if (!buf) {
+		dev_err(&pdev->dev, "%s kmalloc failed\n", __func__);
+		return -ENOMEM;
+	}
+
+	if (mic_status != priv->mic_active_low) {
+		snprintf(buf, 32, "STATE=%d", 2);
+		snd_soc_dapm_disable_pin(snd_soc_codec_get_dapm(priv->codec), "DMIC");
+		ret = imx_mic_jack_gpio.report;
+	} else {
+		snprintf(buf, 32, "STATE=%d", 0);
+		snd_soc_dapm_enable_pin(snd_soc_codec_get_dapm(priv->codec), "DMIC");
+		ret = 0;
+	}
+
+	envp[0] = "NAME=microphone";
+	envp[1] = buf;
+	envp[2] = NULL;
+	kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
+	kfree(buf);
+
+	return ret;
+}
+
+
 static const struct snd_soc_dapm_widget imx_wm8962_dapm_widgets[] = {
 	SND_SOC_DAPM_HP("Headphone Jack", NULL),
 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
@@ -110,8 +231,6 @@ static int imx_hifi_hw_free(struct snd_pcm_substream *substream)
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct imx_priv *priv = &card_priv;
-	struct snd_soc_card *card = platform_get_drvdata(priv->pdev);
-	struct imx_wm8962_data *data = snd_soc_card_get_drvdata(card);
 	struct device *dev = &priv->pdev->dev;
 	int ret;
 
@@ -159,6 +278,92 @@ static struct snd_soc_ops imx_hifi_ops = {
 	.hw_free = imx_hifi_hw_free,
 };
 
+static int imx_wm8962_gpio_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_card *card = rtd->card;
+	struct snd_soc_codec *codec = rtd->codec;
+	struct imx_priv *priv = &card_priv;
+
+	priv->codec = codec;
+
+	if (gpio_is_valid(priv->hp_gpio)) {
+		imx_hp_jack_gpio.gpio = priv->hp_gpio;
+		imx_hp_jack_gpio.jack_status_check = hpjack_status_check;
+	
+		snd_soc_card_jack_new(card, "Headphone Jack",
+				SND_JACK_HEADPHONE, &imx_hp_jack,
+				imx_hp_jack_pins, ARRAY_SIZE(imx_hp_jack_pins));
+
+		snd_soc_jack_add_gpios(&imx_hp_jack, 1, &imx_hp_jack_gpio);
+	}
+
+	if (gpio_is_valid(priv->mic_gpio)) {
+		imx_mic_jack_gpio.gpio = priv->mic_gpio;
+		imx_mic_jack_gpio.jack_status_check = micjack_status_check;
+
+		snd_soc_card_jack_new(card, "AMIC",
+				SND_JACK_MICROPHONE, &imx_mic_jack,
+				imx_mic_jack_pins, ARRAY_SIZE(imx_mic_jack_pins)); 
+
+		snd_soc_jack_add_gpios(&imx_mic_jack, 1, &imx_mic_jack_gpio);
+	} else if (priv->amic_mono || priv->dmic_mono) {
+		/*
+		 * Permanent set monomix bit if only one microphone
+		 * is present on the board while it needs monomix.
+		 */
+		snd_soc_update_bits(priv->codec, WM8962_THREED1,
+				WM8962_ADC_MONOMIX_MASK, WM8962_ADC_MONOMIX);
+	}
+
+	return 0;
+}
+
+static ssize_t headphone_show(struct device_driver *dev, char *buf)
+{
+	struct imx_priv *priv = &card_priv;
+	int hp_status;
+
+	if (!gpio_is_valid(priv->hp_gpio)) {
+		strcpy(buf, "no detect gpio connected\n");
+		return strlen(buf);
+	}
+
+	/* Check if headphone is plugged in */
+	hp_status = gpio_get_value(priv->hp_gpio) ? 1 : 0;
+
+	if (hp_status != priv->hp_active_low)
+		strcpy(buf, "headphone\n");
+	else
+		strcpy(buf, "speaker\n");
+
+	return strlen(buf);
+}
+
+static DRIVER_ATTR_RO(headphone);
+
+static ssize_t microphone_show(struct device_driver *dev, char *buf)
+{
+	struct imx_priv *priv = &card_priv;
+	int mic_status;
+
+	if (!gpio_is_valid(priv->mic_gpio)) {
+		strcpy(buf, "no detect gpio connected\n");
+		return strlen(buf);
+	}
+
+	/* Check if analog microphone is plugged in */
+	mic_status = gpio_get_value(priv->mic_gpio) ? 1 : 0;
+
+	if (mic_status != priv->mic_active_low)
+		strcpy(buf, "amic\n");
+	else
+		strcpy(buf, "dmic\n");
+
+	return strlen(buf);
+}
+
+static DRIVER_ATTR_RO(microphone);
+
 static int imx_wm8962_late_probe(struct snd_soc_card *card)
 {
 	struct snd_soc_pcm_runtime *rtd;
@@ -268,6 +473,14 @@ static int imx_wm8962_probe(struct platform_device *pdev)
 	data->clk_frequency = clk_get_rate(codec_clk);
 	clk_put(codec_clk);
 
+	priv->amic_mono = of_property_read_bool(codec_np, "amic-mono");
+	priv->dmic_mono = of_property_read_bool(codec_np, "dmic-mono");
+
+	priv->hp_gpio = of_get_named_gpio_flags(np, "hp-det-gpios", 0,
+				(enum of_gpio_flags *)&priv->hp_active_low);
+	priv->mic_gpio = of_get_named_gpio_flags(np, "mic-det-gpios", 0,
+				(enum of_gpio_flags *)&priv->mic_active_low);
+
 	data->dai.name = "HiFi";
 	data->dai.stream_name = "HiFi";
 	data->dai.codec_dai_name = "wm8962";
@@ -275,6 +488,7 @@ static int imx_wm8962_probe(struct platform_device *pdev)
 	data->dai.cpu_dai_name = dev_name(&ssi_pdev->dev);
 	data->dai.platform_of_node = ssi_np;
 	data->dai.ops = &imx_hifi_ops;
+	data->dai.init = &imx_wm8962_gpio_init;
 	data->dai.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
 			    SND_SOC_DAIFMT_CBM_CFM;
 
@@ -302,6 +516,27 @@ static int imx_wm8962_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
+	if (gpio_is_valid(priv->hp_gpio)) {
+		ret = driver_create_file(pdev->dev.driver, &driver_attr_headphone);
+		if (ret) {
+			dev_err(&pdev->dev, "create hp attr failed (%d)\n", ret);
+			goto fail_hp;
+		}
+	}
+
+	if (gpio_is_valid(priv->mic_gpio)) {
+		ret = driver_create_file(pdev->dev.driver, &driver_attr_microphone);
+		if (ret) {
+			dev_err(&pdev->dev, "create mic attr failed (%d)\n", ret);
+			goto fail_mic;
+		}
+	}
+
+	goto fail;
+
+fail_mic:
+	driver_remove_file(pdev->dev.driver, &driver_attr_headphone);
+fail_hp:
 fail:
 	of_node_put(ssi_np);
 	of_node_put(codec_np);
@@ -309,6 +544,14 @@ fail:
 	return ret;
 }
 
+static int imx_wm8962_remove(struct platform_device *pdev)
+{
+	driver_remove_file(pdev->dev.driver, &driver_attr_microphone);
+	driver_remove_file(pdev->dev.driver, &driver_attr_headphone);
+
+	return 0;
+}
+
 static const struct of_device_id imx_wm8962_dt_ids[] = {
 	{ .compatible = "fsl,imx-audio-wm8962", },
 	{ /* sentinel */ }
@@ -322,6 +565,7 @@ static struct platform_driver imx_wm8962_driver = {
 		.of_match_table = imx_wm8962_dt_ids,
 	},
 	.probe = imx_wm8962_probe,
+	.remove = imx_wm8962_remove,
 };
 module_platform_driver(imx_wm8962_driver);