From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
By far the most common way of looking up GPIO devices is using their
label. Provide a helpers for that to avoid every user implementing their
own matching function.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
---
drivers/gpio/gpiolib.c | 21 +++++++++++++++++++++
include/linux/gpio/driver.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9e083ecb8df0..74b837671d30 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>
@@ -1074,6 +1075,26 @@ 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 5c5029cec226..92f7143bad3e 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -609,6 +609,7 @@ 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);
--
2.39.2
