diff options
| -rw-r--r-- | drivers/gpio/gpiolib.c | 21 | ||||
| -rw-r--r-- | include/linux/gpio/driver.h | 1 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index d5bdf9cebb29..0a41f6ee8d33 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -20,6 +20,7 @@ #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/spinlock.h> +#include <linux/string.h> #include <linux/gpio.h> #include <linux/gpio/driver.h> @@ -1081,6 +1082,26 @@ struct gpio_device *gpio_device_find(void *data, } EXPORT_SYMBOL_GPL(gpio_device_find); +static int gpio_chip_match_by_label(struct gpio_chip *gc, void *label) +{ + return gc->label && !strcmp(gc->label, label); +} + +/** + * gpio_device_find_by_label() - wrapper around gpio_device_find() finding the + * GPIO device by its backing chip's label + * @label: Label to lookup + * + * Returns: + * Reference to the GPIO device or NULL. Reference must be released with + * gpio_device_put(). + */ +struct gpio_device *gpio_device_find_by_label(const char *label) +{ + return gpio_device_find((void *)label, gpio_chip_match_by_label); +} +EXPORT_SYMBOL_GPL(gpio_device_find_by_label); + static int gpiochip_match_name(struct gpio_chip *gc, void *data) { const char *name = data; diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 6ad1f1a8ef2e..24996cba6465 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -610,6 +610,7 @@ struct gpio_chip *gpiochip_find(void *data, struct gpio_device *gpio_device_find(void *data, int (*match)(struct gpio_chip *gc, void *data)); +struct gpio_device *gpio_device_find_by_label(const char *label); struct gpio_device *gpio_device_get(struct gpio_device *gdev); void gpio_device_put(struct gpio_device *gdev); |