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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2020-06-15 18:05:41 +0300
committerLinus Walleij <linus.walleij@linaro.org>2020-06-21 00:13:26 +0300
commitb3337eb24831db058231ea87838f316d9eb86253 (patch)
tree371b1e6a3e5aa6622b4790de00ab7086e227d1a6 /include/linux/gpio
parentb3a9e3b9622ae10064826dccb4f7a52bd88c7407 (diff)
downloadlinux-b3337eb24831db058231ea87838f316d9eb86253.tar.xz
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.h16
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,