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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2018-07-02 20:05:34 (GMT)
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2018-07-05 21:21:15 (GMT)
commit9bfd7d9e5d63532da2d2d55a6bec5bb377761d37 (patch)
tree66892eab980c9fdede6592cda7a10bfd2b9cd3a7 /drivers/leds
parente4786ba0db7b1163403c29c429f5ef61906a84c0 (diff)
leds: gpio trigger: simplifications from core changes
The trigger core learned error handling for the activate callback and to handle device attributes. Also make use of the module_led_trigger() helper to simplify trigger registration. 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-gpio.c87
1 files changed, 25 insertions, 62 deletions
diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index f5358c4..ed0db8e 100644
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -28,7 +28,7 @@ struct gpio_trig_data {
static irqreturn_t gpio_trig_irq(int irq, void *_led)
{
struct led_classdev *led = _led;
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct gpio_trig_data *gpio_data = led_get_trigger_data(led);
int tmp;
tmp = gpio_get_value_cansleep(gpio_data->gpio);
@@ -51,8 +51,7 @@ static irqreturn_t gpio_trig_irq(int irq, void *_led)
static ssize_t gpio_trig_brightness_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n", gpio_data->desired_brightness);
}
@@ -60,8 +59,7 @@ static ssize_t gpio_trig_brightness_show(struct device *dev,
static ssize_t gpio_trig_brightness_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
unsigned desired_brightness;
int ret;
@@ -81,8 +79,7 @@ static DEVICE_ATTR(desired_brightness, 0644, gpio_trig_brightness_show,
static ssize_t gpio_trig_inverted_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n", gpio_data->inverted);
}
@@ -90,8 +87,8 @@ static ssize_t gpio_trig_inverted_show(struct device *dev,
static ssize_t gpio_trig_inverted_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct led_classdev *led = led_trigger_get_led(dev);
+ struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
unsigned long inverted;
int ret;
@@ -115,8 +112,7 @@ static DEVICE_ATTR(inverted, 0644, gpio_trig_inverted_show,
static ssize_t gpio_trig_gpio_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n", gpio_data->gpio);
}
@@ -124,8 +120,8 @@ static ssize_t gpio_trig_gpio_show(struct device *dev,
static ssize_t gpio_trig_gpio_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct led_classdev *led = led_trigger_get_led(dev);
+ struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
unsigned gpio;
int ret;
@@ -162,77 +158,44 @@ static ssize_t gpio_trig_gpio_store(struct device *dev,
}
static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);
+static struct attribute *gpio_trig_attrs[] = {
+ &dev_attr_desired_brightness.attr,
+ &dev_attr_inverted.attr,
+ &dev_attr_gpio.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(gpio_trig);
+
static int gpio_trig_activate(struct led_classdev *led)
{
struct gpio_trig_data *gpio_data;
- int ret;
gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
if (!gpio_data)
- return 0;
-
- ret = device_create_file(led->dev, &dev_attr_gpio);
- if (ret)
- goto err_gpio;
-
- ret = device_create_file(led->dev, &dev_attr_inverted);
- if (ret)
- goto err_inverted;
-
- ret = device_create_file(led->dev, &dev_attr_desired_brightness);
- if (ret)
- goto err_brightness;
+ return -ENOMEM;
gpio_data->led = led;
- led->trigger_data = gpio_data;
- led->activated = true;
-
- return 0;
-
-err_brightness:
- device_remove_file(led->dev, &dev_attr_inverted);
-
-err_inverted:
- device_remove_file(led->dev, &dev_attr_gpio);
-
-err_gpio:
- kfree(gpio_data);
+ led_set_trigger_data(led, gpio_data);
return 0;
}
static void gpio_trig_deactivate(struct led_classdev *led)
{
- struct gpio_trig_data *gpio_data = led->trigger_data;
+ struct gpio_trig_data *gpio_data = led_get_trigger_data(led);
- if (led->activated) {
- device_remove_file(led->dev, &dev_attr_gpio);
- device_remove_file(led->dev, &dev_attr_inverted);
- device_remove_file(led->dev, &dev_attr_desired_brightness);
- if (gpio_data->gpio != 0)
- free_irq(gpio_to_irq(gpio_data->gpio), led);
- kfree(gpio_data);
- led->activated = false;
- }
+ if (gpio_data->gpio != 0)
+ free_irq(gpio_to_irq(gpio_data->gpio), led);
+ kfree(gpio_data);
}
static struct led_trigger gpio_led_trigger = {
.name = "gpio",
.activate = gpio_trig_activate,
.deactivate = gpio_trig_deactivate,
+ .groups = gpio_trig_groups,
};
-
-static int __init gpio_trig_init(void)
-{
- return led_trigger_register(&gpio_led_trigger);
-}
-module_init(gpio_trig_init);
-
-static void __exit gpio_trig_exit(void)
-{
- led_trigger_unregister(&gpio_led_trigger);
-}
-module_exit(gpio_trig_exit);
+module_led_trigger(gpio_led_trigger);
MODULE_AUTHOR("Felipe Balbi <me@felipebalbi.com>");
MODULE_DESCRIPTION("GPIO LED trigger");

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