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From:   Fletcher Woodruff <fletcherw@chromium.org>
To:     linux-kernel@vger.kernel.org
Cc:     Ben Zhang <benzh@chromium.org>, Jaroslav Kysela <perex@perex.cz>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Oder Chiou <oder_chiou@realtek.com>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        Fletcher Woodruff <fletcherw@chromium.org>
Subject: [PATCH v3 1/3] ASoC: rt5677: allow multiple interrupt sources
Date:   Mon, 15 Apr 2019 13:45:57 -0600
Message-Id: <20190415194557.9182-2-fletcherw@chromium.org>
In-Reply-To: <20190415194557.9182-1-fletcherw@chromium.org>
References: <20190405204257.87095-4-fletcherw@chromium.org>
 <20190415194557.9182-1-fletcherw@chromium.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Ben Zhang <benzh@chromium.org>

This patch allows headphone plug detect and mic present
detect to be enabled at the same time. This patch implements
an irq_chip with irq_domain directly instead of using
regmap-irq, so that interrupt source line polarities can
be flipped to support irq sharing.

This patch does not add polarity flipping support within regmap-irq
because there is extra work that must be done within the irq handler
to support hotword detection. On the Chromebook Pixel, the firmware will
disconnect GPIO1 from the jack detection irq when a hotword is detected
and trigger the interrupt handler. Inside the handler, we will need to
detect this, report the hotword event, and re-connect GPIO1 to the jack
detection irq.

Signed-off-by: Ben Zhang <benzh@chromium.org>
Signed-off-by: Fletcher Woodruff <fletcherw@chromium.org>
---
 sound/soc/codecs/rt5677.c | 257 ++++++++++++++++++++++++++++----------
 sound/soc/codecs/rt5677.h |  14 ++-
 2 files changed, 204 insertions(+), 67 deletions(-)

diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 9b7a1833d3316c..ef50314ac61eb5 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -23,6 +23,10 @@
 #include <linux/firmware.h>
 #include <linux/of_device.h>
 #include <linux/property.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/workqueue.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -4620,7 +4624,6 @@ static void rt5677_gpio_config(struct rt5677_priv *rt5677, unsigned offset,
 static int rt5677_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	struct rt5677_priv *rt5677 = gpiochip_get_data(chip);
-	struct regmap_irq_chip_data *data = rt5677->irq_data;
 	int irq;
 
 	if ((rt5677->pdata.jd1_gpio == 1 && offset == RT5677_GPIO1) ||
@@ -4646,7 +4649,7 @@ static int rt5677_to_irq(struct gpio_chip *chip, unsigned offset)
 		return -ENXIO;
 	}
 
-	return regmap_irq_get_virq(data, irq);
+	return irq_create_mapping(rt5677->domain, irq);
 }
 
 static const struct gpio_chip rt5677_template_chip = {
@@ -4716,37 +4719,13 @@ static int rt5677_probe(struct snd_soc_component *component)
 
 	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_OFF);
 
-	regmap_write(rt5677->regmap, RT5677_DIG_MISC, 0x0020);
+	regmap_update_bits(rt5677->regmap, RT5677_DIG_MISC,
+			~RT5677_IRQ_DEBOUNCE_SEL_MASK, 0x0020);
 	regmap_write(rt5677->regmap, RT5677_PWR_DSP2, 0x0c00);
 
 	for (i = 0; i < RT5677_GPIO_NUM; i++)
 		rt5677_gpio_config(rt5677, i, rt5677->pdata.gpio_config[i]);
 
-	if (rt5677->irq_data) {
-		regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1, 0x8000,
-			0x8000);
-		regmap_update_bits(rt5677->regmap, RT5677_DIG_MISC, 0x0018,
-			0x0008);
-
-		if (rt5677->pdata.jd1_gpio)
-			regmap_update_bits(rt5677->regmap, RT5677_JD_CTRL1,
-				RT5677_SEL_GPIO_JD1_MASK,
-				rt5677->pdata.jd1_gpio <<
-				RT5677_SEL_GPIO_JD1_SFT);
-
-		if (rt5677->pdata.jd2_gpio)
-			regmap_update_bits(rt5677->regmap, RT5677_JD_CTRL1,
-				RT5677_SEL_GPIO_JD2_MASK,
-				rt5677->pdata.jd2_gpio <<
-				RT5677_SEL_GPIO_JD2_SFT);
-
-		if (rt5677->pdata.jd3_gpio)
-			regmap_update_bits(rt5677->regmap, RT5677_JD_CTRL1,
-				RT5677_SEL_GPIO_JD3_MASK,
-				rt5677->pdata.jd3_gpio <<
-				RT5677_SEL_GPIO_JD3_SFT);
-	}
-
 	mutex_init(&rt5677->dsp_cmd_lock);
 	mutex_init(&rt5677->dsp_pri_lock);
 
@@ -5063,65 +5042,211 @@ static void rt5677_read_device_properties(struct rt5677_priv *rt5677,
 			&rt5677->pdata.jd3_gpio);
 }
 
-static struct regmap_irq rt5677_irqs[] = {
+struct rt5677_irq_desc {
+	unsigned int enable_mask;
+	unsigned int status_mask;
+	unsigned int polarity_mask;
+};
+
+static const struct rt5677_irq_desc rt5677_irq_descs[] = {
 	[RT5677_IRQ_JD1] = {
-		.reg_offset = 0,
-		.mask = RT5677_EN_IRQ_GPIO_JD1,
+		.enable_mask = RT5677_EN_IRQ_GPIO_JD1,
+		.status_mask = RT5677_STA_GPIO_JD1,
+		.polarity_mask = RT5677_INV_GPIO_JD1,
 	},
 	[RT5677_IRQ_JD2] = {
-		.reg_offset = 0,
-		.mask = RT5677_EN_IRQ_GPIO_JD2,
+		.enable_mask = RT5677_EN_IRQ_GPIO_JD2,
+		.status_mask = RT5677_STA_GPIO_JD2,
+		.polarity_mask = RT5677_INV_GPIO_JD2,
 	},
 	[RT5677_IRQ_JD3] = {
-		.reg_offset = 0,
-		.mask = RT5677_EN_IRQ_GPIO_JD3,
+		.enable_mask = RT5677_EN_IRQ_GPIO_JD3,
+		.status_mask = RT5677_STA_GPIO_JD3,
+		.polarity_mask = RT5677_INV_GPIO_JD3,
 	},
 };
 
-static struct regmap_irq_chip rt5677_irq_chip = {
-	.name = "rt5677",
-	.irqs = rt5677_irqs,
-	.num_irqs = ARRAY_SIZE(rt5677_irqs),
-
-	.num_regs = 1,
-	.status_base = RT5677_IRQ_CTRL1,
-	.mask_base = RT5677_IRQ_CTRL1,
-	.mask_invert = 1,
-};
-
-static int rt5677_init_irq(struct i2c_client *i2c)
+static irqreturn_t rt5677_irq(int unused, void *data)
 {
-	int ret;
+	struct i2c_client *i2c = data;
 	struct rt5677_priv *rt5677 = i2c_get_clientdata(i2c);
+	int ret = 0, i, reg_irq, virq;
+	bool irq_fired;
 
-	if (!rt5677->pdata.jd1_gpio &&
-		!rt5677->pdata.jd2_gpio &&
-		!rt5677->pdata.jd3_gpio)
-		return 0;
-
-	if (!i2c->irq) {
-		dev_err(&i2c->dev, "No interrupt specified\n");
-		return -EINVAL;
+	mutex_lock(&rt5677->irq_lock);
+	/* Read interrupt status */
+	ret = regmap_read(rt5677->regmap, RT5677_IRQ_CTRL1, &reg_irq);
+	if (ret) {
+		dev_err(&i2c->dev,
+			"Failed to read IRQ status: %d\n",
+			ret);
+		goto exit;
+	}
+	/*
+	 * Clear the interrupt by flipping the polarity of the
+	 * interrupt source lines that just fired
+	 */
+	irq_fired = false;
+	for (i = 0; i < RT5677_IRQ_NUM; i++) {
+		if (reg_irq & rt5677_irq_descs[i].status_mask) {
+			reg_irq ^= rt5677_irq_descs[i].polarity_mask;
+			irq_fired = true;
+		}
 	}
+	if (!irq_fired)
+		goto exit;
 
-	ret = regmap_add_irq_chip(rt5677->regmap, i2c->irq,
-		IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
-		&rt5677_irq_chip, &rt5677->irq_data);
+	ret = regmap_write(rt5677->regmap, RT5677_IRQ_CTRL1, reg_irq);
+	if (ret) {
+		dev_err(&i2c->dev,
+			"Failed to update IRQ status: %d\n",
+			ret);
+		goto exit;
+	}
 
-	if (ret != 0) {
-		dev_err(&i2c->dev, "Failed to register IRQ chip: %d\n", ret);
-		return ret;
+	/* Process interrupts */
+	for (i = 0; i < RT5677_IRQ_NUM; i++) {
+		if ((reg_irq & rt5677_irq_descs[i].enable_mask) &&
+		    (reg_irq & rt5677_irq_descs[i].status_mask)) {
+			virq = irq_find_mapping(rt5677->domain, i);
+			if (virq)
+				handle_nested_irq(virq);
+		}
 	}
+exit:
+	mutex_unlock(&rt5677->irq_lock);
+	return IRQ_HANDLED;
+}
+
+static void rt5677_irq_work(struct work_struct *work)
+{
+	struct rt5677_priv *rt5677 =
+		container_of(work, struct rt5677_priv, irq_work.work);
+
+	rt5677_irq(0, rt5677);
+}
+
+static void rt5677_irq_bus_lock(struct irq_data *data)
+{
+	struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&rt5677->irq_lock);
+}
+
+static void rt5677_irq_bus_sync_unlock(struct irq_data *data)
+{
+	struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
 
+	regmap_update_bits(rt5677->regmap, RT5677_IRQ_CTRL1,
+			RT5677_EN_IRQ_GPIO_JD1 | RT5677_EN_IRQ_GPIO_JD2 |
+			RT5677_EN_IRQ_GPIO_JD3, rt5677->irq_en);
+	mutex_unlock(&rt5677->irq_lock);
+}
+
+static void rt5677_irq_enable(struct irq_data *data)
+{
+	struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
+
+	rt5677->irq_en |= rt5677_irq_descs[data->hwirq].enable_mask;
+}
+
+static void rt5677_irq_disable(struct irq_data *data)
+{
+	struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data);
+
+	rt5677->irq_en &= ~rt5677_irq_descs[data->hwirq].enable_mask;
+}
+
+static struct irq_chip rt5677_irq_chip = {
+	.name			= "rt5677_irq_chip",
+	.irq_bus_lock		= rt5677_irq_bus_lock,
+	.irq_bus_sync_unlock	= rt5677_irq_bus_sync_unlock,
+	.irq_disable		= rt5677_irq_disable,
+	.irq_enable		= rt5677_irq_enable,
+};
+
+static int rt5677_irq_map(struct irq_domain *h, unsigned int virq,
+			  irq_hw_number_t hw)
+{
+	struct rt5677_priv *rt5677 = h->host_data;
+
+	irq_set_chip_data(virq, rt5677);
+	irq_set_chip(virq, &rt5677_irq_chip);
+	irq_set_nested_thread(virq, 1);
+	irq_set_noprobe(virq);
 	return 0;
 }
 
-static void rt5677_free_irq(struct i2c_client *i2c)
+
+static const struct irq_domain_ops rt5677_domain_ops = {
+	.map	= rt5677_irq_map,
+	.xlate	= irq_domain_xlate_twocell,
+};
+
+static void rt5677_init_irq(struct i2c_client *i2c)
+{
+	struct rt5677_priv *rt5677 = i2c_get_clientdata(i2c);
+	int ret;
+	unsigned int jd_mask = 0, jd_val = 0;
+
+	/* No irq has been assigned to the codec */
+	if (!i2c->irq)
+		return;
+
+	mutex_init(&rt5677->irq_lock);
+	INIT_DELAYED_WORK(&rt5677->irq_work, rt5677_irq_work);
+
+	/*
+	 * Select RC as the debounce clock so that GPIO works even when
+	 * MCLK is gated which happens when there is no audio stream
+	 * (SND_SOC_BIAS_OFF).
+	 */
+	regmap_update_bits(rt5677->regmap, RT5677_DIG_MISC,
+			RT5677_IRQ_DEBOUNCE_SEL_MASK,
+			RT5677_IRQ_DEBOUNCE_SEL_RC);
+	/* Enable auto power on RC when GPIO states are changed */
+	regmap_update_bits(rt5677->regmap, RT5677_GEN_CTRL1, 0xff, 0xff);
+
+	/* Select and enable jack detection sources per platform data */
+	if (rt5677->pdata.jd1_gpio) {
+		jd_mask	|= RT5677_SEL_GPIO_JD1_MASK;
+		jd_val	|= rt5677->pdata.jd1_gpio << RT5677_SEL_GPIO_JD1_SFT;
+	}
+	if (rt5677->pdata.jd2_gpio) {
+		jd_mask	|= RT5677_SEL_GPIO_JD2_MASK;
+		jd_val	|= rt5677->pdata.jd2_gpio << RT5677_SEL_GPIO_JD2_SFT;
+	}
+	if (rt5677->pdata.jd3_gpio) {
+		jd_mask	|= RT5677_SEL_GPIO_JD3_MASK;
+		jd_val	|= rt5677->pdata.jd3_gpio << RT5677_SEL_GPIO_JD3_SFT;
+	}
+	regmap_update_bits(rt5677->regmap, RT5677_JD_CTRL1, jd_mask, jd_val);
+
+	/* Set GPIO1 pin to be IRQ output */
+	regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1,
+			RT5677_GPIO1_PIN_MASK, RT5677_GPIO1_PIN_IRQ);
+
+	/* Ready to listen for interrupts */
+	rt5677->domain = irq_domain_add_linear(i2c->dev.of_node,
+			RT5677_IRQ_NUM, &rt5677_domain_ops, rt5677);
+	if (!rt5677->domain) {
+		dev_err(&i2c->dev, "Failed to create IRQ domain\n");
+		return;
+	}
+	ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, rt5677_irq,
+			IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+			"rt5677", i2c);
+	if (ret) {
+		dev_err(&i2c->dev, "Failed to request IRQ: %d\n", ret);
+		return;
+	}
+}
+
+static void rt5677_irq_exit(struct i2c_client *i2c)
 {
 	struct rt5677_priv *rt5677 = i2c_get_clientdata(i2c);
 
-	if (rt5677->irq_data)
-		regmap_del_irq_chip(i2c->irq, rt5677->irq_data);
+	cancel_delayed_work_sync(&rt5677->irq_work);
 }
 
 static int rt5677_i2c_probe(struct i2c_client *i2c)
@@ -5259,7 +5384,7 @@ static int rt5677_i2c_probe(struct i2c_client *i2c)
 
 static int rt5677_i2c_remove(struct i2c_client *i2c)
 {
-	rt5677_free_irq(i2c);
+	rt5677_irq_exit(i2c);
 	rt5677_free_gpio(i2c);
 
 	return 0;
diff --git a/sound/soc/codecs/rt5677.h b/sound/soc/codecs/rt5677.h
index 183d92b030459f..9c73bea8635508 100644
--- a/sound/soc/codecs/rt5677.h
+++ b/sound/soc/codecs/rt5677.h
@@ -1636,6 +1636,12 @@
 #define RT5677_GPIO6_P_NOR			(0x0 << 0)
 #define RT5677_GPIO6_P_INV			(0x1 << 0)
 
+/* General Control (0xfa) */
+#define RT5677_IRQ_DEBOUNCE_SEL_MASK		(0x3 << 3)
+#define RT5677_IRQ_DEBOUNCE_SEL_MCLK		(0x0 << 3)
+#define RT5677_IRQ_DEBOUNCE_SEL_RC		(0x1 << 3)
+#define RT5677_IRQ_DEBOUNCE_SEL_SLIM		(0x2 << 3)
+
 /* Virtual DSP Mixer Control (0xf7 0xf8 0xf9) */
 #define RT5677_DSP_IB_01_H			(0x1 << 15)
 #define RT5677_DSP_IB_01_H_SFT			15
@@ -1713,6 +1719,7 @@ enum {
 	RT5677_IRQ_JD1,
 	RT5677_IRQ_JD2,
 	RT5677_IRQ_JD3,
+	RT5677_IRQ_NUM,
 };
 
 enum rt5677_type {
@@ -1811,9 +1818,14 @@ struct rt5677_priv {
 	struct gpio_chip gpio_chip;
 #endif
 	bool dsp_vad_en;
-	struct regmap_irq_chip_data *irq_data;
 	bool is_dsp_mode;
 	bool is_vref_slow;
+
+	/* Interrupt handling */
+	struct irq_domain *domain;
+	struct mutex irq_lock;
+	unsigned int irq_en;
+	struct delayed_work irq_work;
 };
 
 int rt5677_sel_asrc_clk_src(struct snd_soc_component *component,
-- 
2.21.0.392.gf8f6787159e-goog