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gpiolib: acpi: Add acpi_gpio_get_io_resource()

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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>
This commit is contained in:
Daniel Scally 2021-06-03 23:40:05 +01:00 committed by Andy Shevchenko
parent 43582f29b1
commit 043d7f09bf
2 changed files with 30 additions and 0 deletions
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23
drivers/gpio/gpiolib-acpi.c
View file

@ -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)
{

7
include/linux/acpi.h
View file

@ -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)
{