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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2018-07-02 20:05:33 (GMT)
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2018-07-05 21:21:14 (GMT)
commite4786ba0db7b1163403c29c429f5ef61906a84c0 (patch)
tree7e81e79d6e12810e87754fa1d29a426bf4f5c375 /drivers/leds
parent13d698cbd99ce90f1d6b4fb0ff11ab90eb55f55e (diff)
leds: backlight trigger: simplifications from core changes
Use the new module_led_trigger() helper. Also use attribute support from the trigger core. Drop error message on allocation failure as kzalloc() already screams loudly when failing. Use wrappers to get and set trigger data. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/trigger/ledtrig-backlight.c62
1 files changed, 19 insertions, 43 deletions
diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c
index 8451296..c2b57be 100644
--- a/drivers/leds/trigger/ledtrig-backlight.c
+++ b/drivers/leds/trigger/ledtrig-backlight.c
@@ -64,8 +64,7 @@ static int fb_notifier_callback(struct notifier_block *p,
static ssize_t bl_trig_invert_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct bl_trig_notifier *n = led->trigger_data;
+ struct bl_trig_notifier *n = led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n", n->invert);
}
@@ -73,8 +72,8 @@ static ssize_t bl_trig_invert_show(struct device *dev,
static ssize_t bl_trig_invert_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t num)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct bl_trig_notifier *n = led->trigger_data;
+ struct led_classdev *led = led_trigger_get_led(dev);
+ struct bl_trig_notifier *n = led_trigger_get_drvdata(dev);
unsigned long invert;
int ret;
@@ -97,6 +96,12 @@ static ssize_t bl_trig_invert_store(struct device *dev,
}
static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store);
+static struct attribute *bl_trig_attrs[] = {
+ &dev_attr_inverted.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(bl_trig);
+
static int bl_trig_activate(struct led_classdev *led)
{
int ret;
@@ -104,15 +109,9 @@ static int bl_trig_activate(struct led_classdev *led)
struct bl_trig_notifier *n;
n = kzalloc(sizeof(struct bl_trig_notifier), GFP_KERNEL);
- led->trigger_data = n;
- if (!n) {
- dev_err(led->dev, "unable to allocate backlight trigger\n");
- return 0;
- }
-
- ret = device_create_file(led->dev, &dev_attr_inverted);
- if (ret)
- goto err_invert;
+ if (!n)
+ return -ENOMEM;
+ led_set_trigger_data(led, n);
n->led = led;
n->brightness = led->brightness;
@@ -122,48 +121,25 @@ static int bl_trig_activate(struct led_classdev *led)
ret = fb_register_client(&n->notifier);
if (ret)
dev_err(led->dev, "unable to register backlight trigger\n");
- led->activated = true;
-
- return 0;
-
-err_invert:
- led->trigger_data = NULL;
- kfree(n);
return 0;
}
static void bl_trig_deactivate(struct led_classdev *led)
{
- struct bl_trig_notifier *n =
- (struct bl_trig_notifier *) led->trigger_data;
-
- if (led->activated) {
- device_remove_file(led->dev, &dev_attr_inverted);
- fb_unregister_client(&n->notifier);
- kfree(n);
- led->activated = false;
- }
+ struct bl_trig_notifier *n = led_get_trigger_data(led);
+
+ fb_unregister_client(&n->notifier);
+ kfree(n);
}
static struct led_trigger bl_led_trigger = {
.name = "backlight",
.activate = bl_trig_activate,
- .deactivate = bl_trig_deactivate
+ .deactivate = bl_trig_deactivate,
+ .groups = bl_trig_groups,
};
-
-static int __init bl_trig_init(void)
-{
- return led_trigger_register(&bl_led_trigger);
-}
-
-static void __exit bl_trig_exit(void)
-{
- led_trigger_unregister(&bl_led_trigger);
-}
-
-module_init(bl_trig_init);
-module_exit(bl_trig_exit);
+module_led_trigger(bl_led_trigger);
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("Backlight emulation LED trigger");

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