devm_led_trigger_register() was added in Linux commit 9534cc31d "leds:
core: add managed version of led_trigger_register"
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/leds.h | 6 ++++++
backport/compat/backport-4.5.c | 29 +++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/backport/backport-include/linux/leds.h b/backport/backport-include/linux/leds.h
index 53b3066..fb4d7b3 100644
--- a/backport/backport-include/linux/leds.h
+++ b/backport/backport-include/linux/leds.h
@@ -56,6 +56,12 @@ extern int led_set_brightness_sync(struct led_classdev *led_cdev,
enum led_brightness value);
#endif /* < 4.5 && >= 3.19 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
+#define devm_led_trigger_register LINUX_BACKPORT(devm_led_trigger_register)
+extern int devm_led_trigger_register(struct device *dev,
+ struct led_trigger *trigger);
+#endif /* < 4.5 */
+
#include <backport/leds-disabled.h>
#endif /* __BACKPORT_LINUX_LEDS_H */
diff --git a/backport/compat/backport-4.5.c b/backport/compat/backport-4.5.c
index 16306e1..bbf4f3b 100644
--- a/backport/compat/backport-4.5.c
+++ b/backport/compat/backport-4.5.c
@@ -13,6 +13,7 @@
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/fs.h>
+#include <linux/leds.h>
#include <linux/phy.h>
#include <linux/printk.h>
#include <linux/slab.h>
@@ -122,3 +123,31 @@ void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
}
}
EXPORT_SYMBOL_GPL(phy_attached_print);
+
+static void devm_led_trigger_release(struct device *dev, void *res)
+{
+ led_trigger_unregister(*(struct led_trigger **)res);
+}
+
+int devm_led_trigger_register(struct device *dev,
+ struct led_trigger *trig)
+{
+ struct led_trigger **dr;
+ int rc;
+
+ dr = devres_alloc(devm_led_trigger_release, sizeof(*dr),
+ GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ *dr = trig;
+
+ rc = led_trigger_register(trig);
+ if (rc)
+ devres_free(dr);
+ else
+ devres_add(dev, dr);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(devm_led_trigger_register);
--
2.8.1
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