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path: root/drivers/leds/led-class.c
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Diffstat (limited to 'drivers/leds/led-class.c')
-rw-r--r--drivers/leds/led-class.c39
1 files changed, 37 insertions, 2 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 768d33a79881..fc57d9c2e6ad 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -212,6 +212,31 @@ static const struct dev_pm_ops leds_class_dev_pm_ops = {
.resume = led_resume,
};
+static int match_name(struct device *dev, const void *data)
+{
+ if (!dev_name(dev))
+ return 0;
+ return !strcmp(dev_name(dev), (char *)data);
+}
+
+static int led_classdev_next_name(const char *init_name, char *name,
+ size_t len)
+{
+ unsigned int i = 0;
+ int ret = 0;
+
+ strlcpy(name, init_name, len);
+
+ while (class_find_device(leds_class, NULL, name, match_name) &&
+ (ret < len))
+ ret = snprintf(name, len, "%s_%u", init_name, ++i);
+
+ if (ret >= len)
+ return -ENOMEM;
+
+ return i;
+}
+
/**
* led_classdev_register - register a new object of led_classdev class.
* @parent: The device to register.
@@ -219,12 +244,22 @@ static const struct dev_pm_ops leds_class_dev_pm_ops = {
*/
int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
{
+ char name[64];
+ int ret;
+
+ ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
+ if (ret < 0)
+ return ret;
+
led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
- led_cdev, led_cdev->groups,
- "%s", led_cdev->name);
+ led_cdev, led_cdev->groups, name);
if (IS_ERR(led_cdev->dev))
return PTR_ERR(led_cdev->dev);
+ if (ret)
+ dev_info(parent, "Led %s renamed to %s due to name collision",
+ led_cdev->name, dev_name(led_cdev->dev));
+
#ifdef CONFIG_LEDS_TRIGGERS
init_rwsem(&led_cdev->trigger_lock);
#endif