[PATCH 06/21] gpiolib: provide gpiod_to_device()

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

struct gpio_desc is opaque so provide a way for users to retrieve the
underlying GPIO device.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/gpio/gpiolib.c      | 14 ++++++++++++++
 include/linux/gpio/driver.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4a9af6bfc6d4..9637a79a9a60 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -219,6 +219,20 @@ struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(gpiod_to_chip);
 
+/**
+ * gpiod_to_device() - Return the GPIO device owning this descriptor
+ * @desc: GPIO descriptor
+ *
+ * Returns:
+ * Pointer to the opaque struct gpio_device object. This function does not
+ * increase the reference count of gpio_device.
+ */
+struct gpio_device *gpiod_to_device(struct gpio_desc *desc)
+{
+	return gpio_device_get(desc->gdev);
+}
+EXPORT_SYMBOL_GPL(gpiod_to_device);
+
 /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
 static int gpiochip_find_base(int ngpio)
 {
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index b2572b26c8e3..e3747e730ed1 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -778,6 +778,7 @@ int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
 void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
 
 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
+struct gpio_device *gpiod_to_device(struct gpio_desc *desc);
 
 #else /* CONFIG_GPIOLIB */
 
-- 
2.39.2