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gpiolib: make gpio_device_get() and gpio_device_put() public 

[ Upstream commit 36aa129f221c9070afd8dff03154ab49702a5b1b ]

In order to start migrating away from accessing struct gpio_chip by
users other than their owners, let's first make the reference management
functions for the opaque struct gpio_device public in the driver.h
header.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Stable-dep-of: 48e1b4d369cf ("gpiolib: remove the GPIO device from the list when it's unregistered")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bartosz Golaszewski 2023-09-27 16:29:21 +02:00 committed by Greg Kroah-Hartman
parent 9b0cc30d26
commit 799233ad1e
3 changed files with 27 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/gpio/gpiolib.c
View File

@ -1058,6 +1058,30 @@ static struct gpio_chip *find_chip_by_name(const char *name)
return gpiochip_find((void *)name, gpiochip_match_name);
}
/**
* gpio_device_get() - Increase the reference count of this GPIO device
* @gdev: GPIO device to increase the refcount for
*
* Returns:
* Pointer to @gdev.
*/
struct gpio_device *gpio_device_get(struct gpio_device *gdev)
{
return to_gpio_device(get_device(&gdev->dev));
}
EXPORT_SYMBOL_GPL(gpio_device_get);
/**
* gpio_device_put() - Decrease the reference count of this GPIO device and
* possibly free all resources associated with it.
* @gdev: GPIO device to decrease the reference count for
*/
void gpio_device_put(struct gpio_device *gdev)
{
put_device(&gdev->dev);
}
EXPORT_SYMBOL_GPL(gpio_device_put);
#ifdef CONFIG_GPIOLIB_IRQCHIP
/*

10
drivers/gpio/gpiolib.h
View File

@ -86,16 +86,6 @@ static inline struct gpio_device *to_gpio_device(struct device *dev)
return container_of(dev, struct gpio_device, dev);
}
static inline struct gpio_device *gpio_device_get(struct gpio_device *gdev)
{
return to_gpio_device(get_device(&gdev->dev));
}
static inline void gpio_device_put(struct gpio_device *gdev)
{
put_device(&gdev->dev);
}
/* gpio suffixes used for ACPI and device tree lookup */
static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };

3
include/linux/gpio/driver.h
View File

@ -607,6 +607,9 @@ extern int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip
extern struct gpio_chip *gpiochip_find(void *data,
int (*match)(struct gpio_chip *gc, void *data));
struct gpio_device *gpio_device_get(struct gpio_device *gdev);
void gpio_device_put(struct gpio_device *gdev);
bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset);
int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);