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author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2018-07-02 22:05:34 +0200 |
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committer | Jacek Anaszewski <jacek.anaszewski@gmail.com> | 2018-07-05 23:21:15 +0200 |
commit | 9bfd7d9e5d63532da2d2d55a6bec5bb377761d37 (patch) | |
tree | 66892eab980c9fdede6592cda7a10bfd2b9cd3a7 /drivers/leds | |
parent | leds: backlight trigger: simplifications from core changes (diff) | |
download | linux-9bfd7d9e5d63532da2d2d55a6bec5bb377761d37.tar.xz linux-9bfd7d9e5d63532da2d2d55a6bec5bb377761d37.zip |
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.c | 87 |
1 files changed, 25 insertions, 62 deletions
diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c index f5358c40d03f..ed0db8ed825f 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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