[PATCH v4 3/9] gpiolib: acpi: Take into account debounce settings

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

We didn't take into account the debounce settings supplied by ACPI.
This change is targeting the mentioned gap.

Reported-by: Coiby Xu <coiby.xu@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/gpio/gpiolib-acpi.c | 18 ++++++++++++++++++
 drivers/gpio/gpiolib-acpi.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index c127b410a7a2..b4a0decfeac2 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -299,6 +299,10 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
 		return AE_OK;
 	}
 
+	ret = gpiod_set_debounce(desc, agpio->debounce_timeout);
+	if (ret)
+		goto fail_free_desc;
+
 	ret = gpiochip_lock_as_irq(chip, pin);
 	if (ret) {
 		dev_err(chip->parent,
@@ -664,6 +668,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 		lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
 					      agpio->pin_table[pin_index]);
 		lookup->info.pin_config = agpio->pin_config;
+		lookup->info.debounce = agpio->debounce_timeout;
 		lookup->info.gpioint = gpioint;
 
 		/*
@@ -961,6 +966,10 @@ int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 			if (ret < 0)
 				return ret;
 
+			ret = gpiod_set_debounce(desc, info.debounce);
+			if (ret)
+				return ret;
+
 			irq_flags = acpi_dev_get_irq_type(info.triggering,
 							  info.polarity);
 
@@ -1048,6 +1057,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
 		if (!found) {
 			enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
 			const char *label = "ACPI:OpRegion";
+			int ret;
 
 			desc = gpiochip_request_own_desc(chip, pin, label,
 							 GPIO_ACTIVE_HIGH,
@@ -1058,6 +1068,14 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
 				goto out;
 			}
 
+			ret = gpiod_set_debounce(desc, agpio->debounce_timeout);
+			if (ret) {
+				status = AE_ERROR;
+				gpiochip_free_own_desc(desc);
+				mutex_unlock(&achip->conn_lock);
+				goto out;
+			}
+
 			conn = kzalloc(sizeof(*conn), GFP_KERNEL);
 			if (!conn) {
 				status = AE_NO_MEMORY;
diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h
index 1c6d65cf0629..e2edb632b2cc 100644
--- a/drivers/gpio/gpiolib-acpi.h
+++ b/drivers/gpio/gpiolib-acpi.h
@@ -18,6 +18,7 @@ struct acpi_device;
  * @pin_config: pin bias as provided by ACPI
  * @polarity: interrupt polarity as provided by ACPI
  * @triggering: triggering type as provided by ACPI
+ * @debounce: debounce timeout as provided by ACPI
  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
  */
 struct acpi_gpio_info {
@@ -27,6 +28,7 @@ struct acpi_gpio_info {
 	int pin_config;
 	int polarity;
 	int triggering;
+	unsigned int debounce;
 	unsigned int quirks;
 };
 
-- 
2.28.0