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authorJean-Jacques Hiblot <jjhiblot@ti.com>2019-10-03 10:28:10 +0200
committerPavel <pavel@ucw.cz>2020-01-06 00:20:18 +0100
commite389240ad99292d52a4f8ff30f16830dc9c63779 (patch)
tree27cde4e5692f1f24562265e108b96568150643bd /drivers/leds
parentleds: Add of_led_get() and led_put() (diff)
downloadlinux-dev-e389240ad99292d52a4f8ff30f16830dc9c63779.tar.xz
linux-dev-e389240ad99292d52a4f8ff30f16830dc9c63779.zip
leds: Add managed API to get a LED from a device driver
If the LED is acquired by a consumer device with devm_led_get(), it is automatically released when the device is detached. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/led-class.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 03ce74a2e6a9..0868f841d656 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -258,6 +258,55 @@ void led_put(struct led_classdev *led_cdev)
}
EXPORT_SYMBOL_GPL(led_put);
+static void devm_led_release(struct device *dev, void *res)
+{
+ struct led_classdev **p = res;
+
+ led_put(*p);
+}
+
+/**
+ * devm_of_led_get - Resource-managed request of a LED device
+ * @dev: LED consumer
+ * @index: index of the LED to obtain in the consumer
+ *
+ * The device node of the device is parse to find the request LED device.
+ * The LED device returned from this function is automatically released
+ * on driver detach.
+ *
+ * @return a pointer to a LED device or ERR_PTR(errno) on failure.
+ */
+struct led_classdev *__must_check devm_of_led_get(struct device *dev,
+ int index)
+{
+ struct led_classdev *led;
+ struct led_classdev **dr;
+
+ if (!dev)
+ return ERR_PTR(-EINVAL);
+
+ /* Not using device tree? */
+ if (!IS_ENABLED(CONFIG_OF) || !dev->of_node)
+ return ERR_PTR(-ENOTSUPP);
+
+ led = of_led_get(dev->of_node, index);
+ if (IS_ERR(led))
+ return led;
+
+ dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *),
+ GFP_KERNEL);
+ if (!dr) {
+ led_put(led);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ *dr = led;
+ devres_add(dev, dr);
+
+ return led;
+}
+EXPORT_SYMBOL_GPL(devm_of_led_get);
+
static int led_classdev_next_name(const char *init_name, char *name,
size_t len)
{