diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-06-15 18:05:41 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-06-20 23:13:26 +0200 |
| commit | b3337eb24831db058231ea87838f316d9eb86253 (patch) | |
| tree | 371b1e6a3e5aa6622b4790de00ab7086e227d1a6 /include/linux/gpio | |
| parent | b3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff) | |
gpiolib: Introduce for_each_requested_gpio_in_range() macro
Introduce for_each_requested_gpio_in_range() macro which helps
to iterate over requested GPIO in a range. There are already
potential users of it, which are going to be converted
by the following patches.
For most of them for_each_requested_gpio() shortcut has been added.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200615150545.87964-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/gpio')
| -rw-r--r-- | include/linux/gpio/driver.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index c4f272af7af5..11cdcb195635 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, |