diff options
| -rw-r--r-- | drivers/gpio/gpiolib.c | 29 | ||||
| -rw-r--r-- | include/linux/gpio/driver.h | 1 |
2 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 95d2a7b2ea3e..0147c900afea 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2387,6 +2387,35 @@ const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset) EXPORT_SYMBOL_GPL(gpiochip_is_requested); /** + * gpiochip_dup_line_label - Get a copy of the consumer label. + * @gc: GPIO chip controlling this line. + * @offset: Hardware offset of the line. + * + * Returns: + * Pointer to a copy of the consumer label if the line is requested or NULL + * if it's not. If a valid pointer was returned, it must be freed using + * kfree(). In case of a memory allocation error, the function returns %ENOMEM. + * + * Must not be called from atomic context. + */ +char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset) +{ + const char *label; + char *copy; + + label = gpiochip_is_requested(gc, offset); + if (!label) + return NULL; + + copy = kstrdup(label, GFP_KERNEL); + if (!copy) + return ERR_PTR(-ENOMEM); + + return copy; +} +EXPORT_SYMBOL_GPL(gpiochip_dup_line_label); + +/** * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor * @gc: GPIO chip * @hwnum: hardware number of the GPIO for which to request the descriptor diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 0aed62f0c633..5ac6dc30c547 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -532,6 +532,7 @@ struct gpio_chip { }; const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset); +char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset); /** * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range |