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Subject[PATCH v7 3/4] ASoC: rt5677: clear interrupts by polarity flip
Date
From: Ben Zhang <benzh@chromium.org>

The rt5677 jack detection function has a requirement that the polarity
of an interrupt be flipped after it fires in order to clear the
interrupt.

This patch implements an irq_chip with irq_domain directly instead of
using regmap-irq, so that interrupt source line polarities can be
flipped in the irq handler.

The reason that this patch does not add this feature within regmap-irq
is that future patches will add hotword detection support to this irq
handler. Those patches will require adding additional logic that would
not make sense to have in regmap-irq.

Signed-off-by: Ben Zhang <benzh@chromium.org>
Signed-off-by: Fletcher Woodruff <fletcherw@chromium.org>
---
sound/soc/codecs/rt5677.c | 170 ++++++++++++++++++++++++++++++--------
sound/soc/codecs/rt5677.h | 7 +-
2 files changed, 143 insertions(+), 34 deletions(-)

diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 87a92ba0d040b7..87466ee222ee59 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 = {
@@ -5042,30 +5045,130 @@ static void rt5677_read_device_properties(struct rt5677_priv *rt5677,
rt5677->pdata.jd3_gpio = val;
}

-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_DRV_NAME,
- .irqs = rt5677_irqs,
- .num_irqs = ARRAY_SIZE(rt5677_irqs),
+static irqreturn_t rt5677_irq(int unused, void *data)
+{
+ struct rt5677_priv *rt5677 = data;
+ int ret = 0, i, reg_irq, virq;
+ bool irq_fired = false;
+
+ mutex_lock(&rt5677->irq_lock);
+ /* Read interrupt status */
+ ret = regmap_read(rt5677->regmap, RT5677_IRQ_CTRL1, &reg_irq);
+ if (ret) {
+ pr_err("rt5677: failed reading IRQ status: %d\n", ret);
+ goto exit;
+ }
+
+ for (i = 0; i < RT5677_IRQ_NUM; i++) {
+ if (reg_irq & rt5677_irq_descs[i].status_mask) {
+ irq_fired = true;
+ virq = irq_find_mapping(rt5677->domain, i);
+ if (virq)
+ handle_nested_irq(virq);
+
+ /* Clear the interrupt by flipping the polarity of the
+ * interrupt source line that fired
+ */
+ reg_irq ^= rt5677_irq_descs[i].polarity_mask;
+ }
+ }
+
+ if (!irq_fired)
+ goto exit;
+
+ ret = regmap_write(rt5677->regmap, RT5677_IRQ_CTRL1, reg_irq);
+ if (ret) {
+ pr_err("rt5677: failed updating IRQ status: %d\n", ret);
+ goto exit;
+ }
+exit:
+ mutex_unlock(&rt5677->irq_lock);
+ if (irq_fired)
+ return IRQ_HANDLED;
+ else
+ return IRQ_NONE;
+}

- .num_regs = 1,
- .status_base = RT5677_IRQ_CTRL1,
- .mask_base = RT5677_IRQ_CTRL1,
- .mask_invert = 1,
+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);
+
+ // Set the enable/disable bits for the jack detect IRQs.
+ 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 const struct irq_domain_ops rt5677_domain_ops = {
+ .map = rt5677_irq_map,
+ .xlate = irq_domain_xlate_twocell,
};

static int rt5677_init_irq(struct i2c_client *i2c)
@@ -5084,6 +5187,8 @@ static int rt5677_init_irq(struct i2c_client *i2c)
return -EINVAL;
}

+ mutex_init(&rt5677->irq_lock);
+
/*
* Select RC as the debounce clock so that GPIO works even when
* MCLK is gated which happens when there is no audio stream
@@ -5092,7 +5197,6 @@ static int rt5677_init_irq(struct i2c_client *i2c)
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);

@@ -5115,26 +5219,25 @@ static int rt5677_init_irq(struct i2c_client *i2c)
regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1,
RT5677_GPIO1_PIN_MASK, RT5677_GPIO1_PIN_IRQ);

- ret = regmap_add_irq_chip(rt5677->regmap, i2c->irq,
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
- &rt5677_irq_chip, &rt5677->irq_data);
+ /* 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 -ENOMEM;
+ }

- if (ret != 0) {
- dev_err(&i2c->dev, "Failed to register IRQ chip: %d\n", ret);
+ ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, rt5677_irq,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ "rt5677", rt5677);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to request IRQ: %d\n", ret);
return ret;
}

return 0;
}

-static void rt5677_free_irq(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);
-}
-
static int rt5677_i2c_probe(struct i2c_client *i2c)
{
struct rt5677_priv *rt5677;
@@ -5259,7 +5362,9 @@ static int rt5677_i2c_probe(struct i2c_client *i2c)
RT5677_MICBIAS1_CTRL_VDD_3_3V);

rt5677_init_gpio(i2c);
- rt5677_init_irq(i2c);
+ ret = rt5677_init_irq(i2c);
+ if (ret)
+ dev_err(&i2c->dev, "Failed to initialize irq: %d\n", ret);

return devm_snd_soc_register_component(&i2c->dev,
&soc_component_dev_rt5677,
@@ -5268,7 +5373,6 @@ static int rt5677_i2c_probe(struct i2c_client *i2c)

static int rt5677_i2c_remove(struct i2c_client *i2c)
{
- rt5677_free_irq(i2c);
rt5677_free_gpio(i2c);

return 0;
diff --git a/sound/soc/codecs/rt5677.h b/sound/soc/codecs/rt5677.h
index c26edd387e340b..d0ac26e562eb5f 100644
--- a/sound/soc/codecs/rt5677.h
+++ b/sound/soc/codecs/rt5677.h
@@ -1749,6 +1749,7 @@ enum {
RT5677_IRQ_JD1,
RT5677_IRQ_JD2,
RT5677_IRQ_JD3,
+ RT5677_IRQ_NUM,
};

enum rt5677_type {
@@ -1847,9 +1848,13 @@ 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;
};

int rt5677_sel_asrc_clk_src(struct snd_soc_component *component,
--
2.22.0.410.gd8fdbe21b5-goog
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