[PATCH v5 4/6] gpiolib: acpi: Add acpi_gpio_get_io_resource()

Daniel Scally
2021-06-03T22:40:40Z

Add a function to verify that a given acpi_resource represents an IO
type GPIO resource, and return it if so.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes since v4:
- None

drivers/gpio/gpiolib-acpi.c | 23 +++++++++++++++++++++++
include/linux/acpi.h | 7 +++++++
2 files changed, 30 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 684ddb35d83b..9887bb684575 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -196,6 +196,29 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
}
EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);

+/**
+ * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
+ * I/O resource or return False if not.
+ * @ares: Pointer to the ACPI resource to fetch
+ * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
+ */
+bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+ struct acpi_resource_gpio **agpio)
+{
+ struct acpi_resource_gpio *gpio;
+
+ if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+ return false;
+
+ gpio = &ares->data.gpio;
+ if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
+ return false;
+
+ *agpio = gpio;
+ return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
+
static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
struct acpi_gpio_event *event)
{
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 170b9bebdb2b..e8ba7063c000 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1098,6 +1098,8 @@ void __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, const c
#if defined(CONFIG_ACPI) && defined(CONFIG_GPIOLIB)
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);
#else
static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
@@ -1105,6 +1107,11 @@ static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
{
return false;
}
+static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+ struct acpi_resource_gpio **agpio)
+{
+ return false;
+}
static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
const char *name, int index)
{
--
2.25.1