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gpio: acpi: Split out acpi_gpio_get_irq_resource() helper

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The helper does retrieve pointer to struct acpi_resource_gpio from
struct acpi_resource if it represents GpioInt() resource.

It will be used by PNP code later on.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2017-05-23 20:03:24 +03:00 committed by Linus Walleij
parent a31f5c3a68
commit 25e3ef894e
2 changed files with 25 additions and 5 deletions
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23
drivers/gpio/gpiolib-acpi.c
View File

@ -165,6 +165,23 @@ static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
/* The address of this function is used as a key. */
}
bool acpi_gpio_get_irq_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_INT)
return false;
*agpio = gpio;
return true;
}
EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
void *context)
{
@ -178,11 +195,7 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
unsigned long irqflags;
int ret, pin, irq;
if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
return AE_OK;
agpio = &ares->data.gpio;
if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
if (!acpi_gpio_get_irq_resource(ares, &agpio))
return AE_OK;
handle = ACPI_HANDLE(chip->parent);

7
include/linux/acpi.h
View File

@ -964,6 +964,8 @@ int devm_acpi_dev_add_driver_gpios(struct device *dev,
const struct acpi_gpio_mapping *gpios);
void devm_acpi_dev_remove_driver_gpios(struct device *dev);
bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
struct acpi_resource_gpio **agpio);
int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index);
#else
static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
@ -980,6 +982,11 @@ static inline int devm_acpi_dev_add_driver_gpios(struct device *dev,
}
static inline void devm_acpi_dev_remove_driver_gpios(struct device *dev) {}
static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
struct acpi_resource_gpio **agpio)
{
return false;
}
static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
{
return -ENXIO;