From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
The trigger core learned error handling for the activate callback and
to handle device attributes. This allows to simplify the driver
considerably. Note that .deactivate is only called when .new_activate
succeeded, so the check for .activated can go away in .deactivate.
Also make use of module_led_trigger() and the accessor function to get
and set trigger_data.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
drivers/leds/trigger/ledtrig-heartbeat.c | 45 +++++++++++-------------
1 file changed, 21 insertions(+), 24 deletions(-)
diff --git a/drivers/leds/trigger/ledtrig-heartbeat.c b/drivers/leds/trigger/ledtrig-heartbeat.c
index 0831535259b2..3e284114e212 100644
--- a/drivers/leds/trigger/ledtrig-heartbeat.c
+++ b/drivers/leds/trigger/ledtrig-heartbeat.c
@@ -96,8 +96,8 @@ static void led_heartbeat_function(struct timer_list *t)
static ssize_t led_invert_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
+ struct heartbeat_trig_data *heartbeat_data =
+ led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n", heartbeat_data->invert);
}
@@ -105,8 +105,8 @@ static ssize_t led_invert_show(struct device *dev,
static ssize_t led_invert_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
+ struct heartbeat_trig_data *heartbeat_data =
+ led_trigger_get_drvdata(dev);
unsigned long state;
int ret;
@@ -121,22 +121,22 @@ static ssize_t led_invert_store(struct device *dev,
static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
+static struct attribute *heartbeat_trig_attrs[] = {
+ &dev_attr_invert.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(heartbeat_trig);
+
static int heartbeat_trig_activate(struct led_classdev *led_cdev)
{
struct heartbeat_trig_data *heartbeat_data;
- int rc;
heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL);
if (!heartbeat_data)
- return 0;
+ return -ENOMEM;
- led_cdev->trigger_data = heartbeat_data;
+ led_set_trigger_data(led_cdev, heartbeat_data);
heartbeat_data->led_cdev = led_cdev;
- rc = device_create_file(led_cdev->dev, &dev_attr_invert);
- if (rc) {
- kfree(led_cdev->trigger_data);
- return 0;
- }
timer_setup(&heartbeat_data->timer, led_heartbeat_function, 0);
heartbeat_data->phase = 0;
@@ -144,28 +144,25 @@ static int heartbeat_trig_activate(struct led_classdev *led_cdev)
led_cdev->blink_brightness = led_cdev->max_brightness;
led_heartbeat_function(&heartbeat_data->timer);
set_bit(LED_BLINK_SW, &led_cdev->work_flags);
- led_cdev->activated = true;
return 0;
}
static void heartbeat_trig_deactivate(struct led_classdev *led_cdev)
{
- struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
-
- if (led_cdev->activated) {
- del_timer_sync(&heartbeat_data->timer);
- device_remove_file(led_cdev->dev, &dev_attr_invert);
- kfree(heartbeat_data);
- clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
- led_cdev->activated = false;
- }
+ struct heartbeat_trig_data *heartbeat_data =
+ led_get_trigger_data(led_cdev);
+
+ del_timer_sync(&heartbeat_data->timer);
+ kfree(heartbeat_data);
+ clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
}
static struct led_trigger heartbeat_led_trigger = {
- .name = "heartbeat",
- .activate = heartbeat_trig_activate,
+ .name = "heartbeat",
+ .new_activate = heartbeat_trig_activate,
.deactivate = heartbeat_trig_deactivate,
+ .groups = heartbeat_trig_groups,
};
static int heartbeat_reboot_notifier(struct notifier_block *nb,
--
2.17.1
