diff options
Diffstat (limited to 'include/linux/gpio/driver.h')
| -rw-r--r-- | include/linux/gpio/driver.h | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index c4f272af7af5..d1cef5c2715c 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -474,6 +474,22 @@ struct gpio_chip { extern const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset); +/** + * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range + * @chip: the chip to query + * @i: loop variable + * @base: first GPIO in the range + * @size: amount of GPIOs to check starting from @base + * @label: label of current GPIO + */ +#define for_each_requested_gpio_in_range(chip, i, base, size, label) \ + for (i = 0; i < size; i++) \ + if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else + +/* Iterates over all requested GPIO of the given @chip */ +#define for_each_requested_gpio(chip, i, label) \ + for_each_requested_gpio_in_range(chip, i, 0, chip->ngpio, label) + /* add/remove chips */ extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, struct lock_class_key *lock_key, @@ -481,25 +497,25 @@ extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, /** * gpiochip_add_data() - register a gpio_chip - * @chip: the chip to register, with chip->base initialized + * @gc: the chip to register, with gc->base initialized * @data: driver-private data associated with this chip * * Context: potentially before irqs will work * * When gpiochip_add_data() is called very early during boot, so that GPIOs - * can be freely used, the chip->parent device must be registered before + * can be freely used, the gc->parent device must be registered before * the gpio framework's arch_initcall(). Otherwise sysfs initialization * for GPIOs will fail rudely. * * gpiochip_add_data() must only be called after gpiolib initialization, * ie after core_initcall(). * - * If chip->base is negative, this requests dynamic assignment of + * If gc->base is negative, this requests dynamic assignment of * a range of valid GPIOs. * * Returns: * A negative errno if the chip can't be registered, such as because the - * chip->base is invalid or already associated with a different chip. + * gc->base is invalid or already associated with a different chip. * Otherwise it returns zero as a success code. */ #ifdef CONFIG_LOCKDEP @@ -509,8 +525,16 @@ extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, gpiochip_add_data_with_key(gc, data, &lock_key, \ &request_key); \ }) +#define devm_gpiochip_add_data(dev, gc, data) ({ \ + static struct lock_class_key lock_key; \ + static struct lock_class_key request_key; \ + devm_gpiochip_add_data_with_key(dev, gc, data, &lock_key, \ + &request_key); \ + }) #else #define gpiochip_add_data(gc, data) gpiochip_add_data_with_key(gc, data, NULL, NULL) +#define devm_gpiochip_add_data(dev, gc, data) \ + devm_gpiochip_add_data_with_key(dev, gc, data, NULL, NULL) #endif /* CONFIG_LOCKDEP */ static inline int gpiochip_add(struct gpio_chip *gc) @@ -518,8 +542,9 @@ static inline int gpiochip_add(struct gpio_chip *gc) return gpiochip_add_data(gc, NULL); } extern void gpiochip_remove(struct gpio_chip *gc); -extern int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *gc, - void *data); +extern int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data, + struct lock_class_key *lock_key, + struct lock_class_key *request_key); extern struct gpio_chip *gpiochip_find(void *data, int (*match)(struct gpio_chip *gc, void *data)); |