gpio: acpi: Add managed variant of acpi_dev_add_driver_gpios()

Introduce device managed variant of acpi_dev_add_driver_gpios() and its
counterpart acpi_dev_remove_driver_gpios().

The functions in most cases are used in driver's ->probe() and
->remove() callbacks, that's why it's useful to have managed variant of
them.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-acpi.c

@@ -362,6 +362,37 @@ int acpi_dev_add_driver_gpios(struct acpi_device *adev,
 }
 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
 
+static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
+{
+	acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
+}
+
+int devm_acpi_dev_add_driver_gpios(struct device *dev,
+				   const struct acpi_gpio_mapping *gpios)
+{
+	void *res;
+	int ret;
+
+	res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
+	if (!res)
+		return -ENOMEM;
+
+	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
+	if (ret) {
+		devres_free(res);
+		return ret;
+	}
+	devres_add(dev, res);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
+
+void devm_acpi_dev_remove_driver_gpios(struct device *dev)
+{
+	WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
+}
+EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
+
 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
 				      const char *name, int index,
 				      struct acpi_reference_args *args)

include/linux/acpi.h

@@ -952,6 +952,10 @@ static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
 		adev->driver_gpios = NULL;
 }
 
+int devm_acpi_dev_add_driver_gpios(struct device *dev,
+				   const struct acpi_gpio_mapping *gpios);
+void devm_acpi_dev_remove_driver_gpios(struct device *dev);
+
 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index);
 #else
 static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
@@ -961,6 +965,13 @@ static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
 }
 static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev) {}
 
+static inline int devm_acpi_dev_add_driver_gpios(struct device *dev,
+			      const struct acpi_gpio_mapping *gpios)
+{
+	return -ENXIO;
+}
+static inline void devm_acpi_dev_remove_driver_gpios(struct device *dev) {}
+
 static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 {
 	return -ENXIO;