[PATCH 3/8] gpiolib: acpi: Add wake_capable parameter to acpi_dev_gpio_irq_get_by

[Raul E Rangel]

The ACPI spec defines the SharedAndWake and ExclusiveAndWake share type
keywords. This is an indication that the GPIO IRQ can also be used as a
wake source. This change exposes the wake_capable bit so drivers can
correctly enable wake functionality instead of making an assumption.

Signed-off-by: Raul E Rangel <rrangel@xxxxxxxxxxxx>
---

 drivers/gpio/gpio-pca953x.c |  3 ++-
 drivers/gpio/gpiolib-acpi.c | 11 ++++++++++-
 drivers/gpio/gpiolib-acpi.h |  2 ++
 include/linux/acpi.h        | 14 +++++++++++---
 4 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index ecd7d169470b06..df02c3eb34a294 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -130,7 +130,8 @@ static int pca953x_acpi_get_irq(struct device *dev)
 	if (ret)
 		dev_warn(dev, "can't add GPIO ACPI mapping\n");
 
-	ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0);
+	ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(dev), "irq-gpios", 0,
+				       NULL);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 9be1376f9a627f..5cda2fcf7f43df 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -741,6 +741,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 		lookup->info.pin_config = agpio->pin_config;
 		lookup->info.debounce = agpio->debounce_timeout;
 		lookup->info.gpioint = gpioint;
+		lookup->info.wake_capable = agpio->wake_capable;
 
 		/*
 		 * Polarity and triggering are only specified for GpioInt
@@ -991,6 +992,7 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
  * @adev: pointer to a ACPI device to get IRQ from
  * @name: optional name of GpioInt resource
  * @index: index of GpioInt resource (starting from %0)
+ * @wake_capable: Set to 1 if the IRQ is wake capable
  *
  * If the device has one or more GpioInt resources, this function can be
  * used to translate from the GPIO offset in the resource to the Linux IRQ
@@ -1002,9 +1004,13 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
  * The function takes optional @name parameter. If the resource has a property
  * name, then only those will be taken into account.
  *
+ * The GPIO is considered wake capable if GpioInt specifies SharedAndWake or
+ * ExclusiveAndWake.
+ *
  * Return: Linux IRQ number (> %0) on success, negative errno on failure.
  */
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index)
+int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name,
+			     int index, int *wake_capable)
 {
 	int idx, i;
 	unsigned int irq_flags;
@@ -1061,6 +1067,9 @@ int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
 				dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
 			}
 
+			if (wake_capable)
+				*wake_capable = info.wake_capable;
+
 			return irq;
 		}
 
diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h
index e476558d947136..1ac6816839dbce 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
+ * @wake_capable: wake capability as provided by ACPI
  * @debounce: debounce timeout as provided by ACPI
  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
  */
@@ -28,6 +29,7 @@ struct acpi_gpio_info {
 	int pin_config;
 	int polarity;
 	int triggering;
+	bool wake_capable;
 	unsigned int debounce;
 	unsigned int quirks;
 };
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6f64b2f3dc5479..7ee946758c5bcc 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1202,7 +1202,8 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 				struct acpi_resource_gpio **agpio);
 bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
 			       struct acpi_resource_gpio **agpio);
-int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
+int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name,
+			     int index, int *wake_capable);
 #else
 static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 					      struct acpi_resource_gpio **agpio)
@@ -1215,7 +1216,8 @@ static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
 	return false;
 }
 static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
-					   const char *name, int index)
+					   const char *name, int index,
+					   int *wake_capable)
 {
 	return -ENXIO;
 }
@@ -1223,7 +1225,13 @@ static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
 
 static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 {
-	return acpi_dev_gpio_irq_get_by(adev, NULL, index);
+	return acpi_dev_gpio_irq_get_by(adev, NULL, index, NULL);
+}
+
+static inline int acpi_dev_gpio_irq_get_wake(struct acpi_device *adev,
+					     int index, int *wake_capable)
+{
+	return acpi_dev_gpio_irq_get_by(adev, NULL, index, wake_capable);
 }
 
 /* Device properties */
-- 
2.37.2.672.g94769d06f0-goog