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authorDaniel Scally <djrscally@gmail.com>2021-06-03 23:40:05 +0100
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2021-06-04 16:24:19 +0300
commit043d7f09bf614809c10c4acbf0695ef731958300 (patch)
tree8a62dceefab5f54426f90f838c7eb91a04294322
parent43582f29b161d820717bc13f562bca27af12e3cf (diff)
gpiolib: acpi: Add acpi_gpio_get_io_resource()
Add a function to verify that a given ACPI resource represents a GpioIo() type of resource, and return it if so. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Daniel Scally <djrscally@gmail.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
-rw-r--r--drivers/gpio/gpiolib-acpi.c23
-rw-r--r--include/linux/acpi.h7
2 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 75cd0c5a5cc4..cf99a5752fe0 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 c60745f657e9..a74d37a3b618 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1096,6 +1096,8 @@ 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,
@@ -1103,6 +1105,11 @@ 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)
{