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>
---
Changes in v3:
- Kept `acpi_dev_gpio_irq_get_by` unchanged to avoid having to touch
unrelated drivers.
- Converted wake_capable parameter to bool.
Changes in v2:
- Fixed call site in mlxbf_gige_probe
drivers/gpio/gpiolib-acpi.c | 17 ++++++++++++++---
drivers/gpio/gpiolib-acpi.h | 2 ++
include/linux/acpi.h | 22 ++++++++++++++++++----
3 files changed, 34 insertions(+), 7 deletions(-)
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 9be1376f9a627f..c703f095993a2c 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -741,6 +741,8 @@ 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 ==
+ ACPI_WAKE_CAPABLE;
/*
* Polarity and triggering are only specified for GpioInt
@@ -987,10 +989,12 @@ struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
}
/**
- * acpi_dev_gpio_irq_get_by() - Find GpioInt and translate it to Linux IRQ number
+ * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ
+ * number
* @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 true 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 +1006,13 @@ 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 the GpioInt resource 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_wake_get_by(struct acpi_device *adev, const char *name,
+ int index, bool *wake_capable)
{
int idx, i;
unsigned int irq_flags;
@@ -1061,13 +1069,16 @@ 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;
}
}
return -ENOENT;
}
-EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get_by);
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
static acpi_status
acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
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..d3121cef6cc3bc 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_wake_get_by(struct acpi_device *adev, const char *name,
+ int index, bool *wake_capable);
#else
static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
struct acpi_resource_gpio **agpio)
@@ -1214,16 +1215,29 @@ 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)
+static inline int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev,
+ const char *name, int index,
+ bool *wake_capable)
{
return -ENXIO;
}
#endif
+static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
+ const char *name, int index)
+{
+ return acpi_dev_gpio_irq_wake_get_by(adev, name, index, NULL);
+}
+
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_wake_get_by(adev, NULL, index, NULL);
+}
+
+static inline int acpi_dev_gpio_irq_wake_get(struct acpi_device *adev,
+ int index, bool *wake_capable)
+{
+ return acpi_dev_gpio_irq_wake_get_by(adev, NULL, index, wake_capable);
}
/* Device properties */
--
2.37.3.968.ga6b4b080e4-goog
