drivers/leds/trigger/ledtrig-oneshot.c

Source file repositories/reference/linux-study-clean/drivers/leds/trigger/ledtrig-oneshot.c

File Facts

System
Linux kernel
Corpus path
drivers/leds/trigger/ledtrig-oneshot.c
Extension
.c
Size
4842 bytes
Lines
201
Domain
Driver Families
Bucket
drivers/leds
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct oneshot_trig_data {
	unsigned int invert;
};

static ssize_t led_shot(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = led_trigger_get_led(dev);
	struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);

	led_blink_set_oneshot(led_cdev,
			&led_cdev->blink_delay_on, &led_cdev->blink_delay_off,
			oneshot_data->invert);

	/* content is ignored */
	return size;
}
static ssize_t led_invert_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);

	return sprintf(buf, "%u\n", oneshot_data->invert);
}

static ssize_t led_invert_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = led_trigger_get_led(dev);
	struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
	unsigned long state;
	int ret;

	ret = kstrtoul(buf, 0, &state);
	if (ret)
		return ret;

	oneshot_data->invert = !!state;

	if (oneshot_data->invert)
		led_set_brightness_nosleep(led_cdev, LED_FULL);
	else
		led_set_brightness_nosleep(led_cdev, LED_OFF);

	return size;
}

static ssize_t led_delay_on_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = led_trigger_get_led(dev);

	return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
}

static ssize_t led_delay_on_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = led_trigger_get_led(dev);
	unsigned long state;
	int ret;

	ret = kstrtoul(buf, 0, &state);
	if (ret)
		return ret;

	led_cdev->blink_delay_on = state;

	return size;
}

static ssize_t led_delay_off_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = led_trigger_get_led(dev);

	return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
}

static ssize_t led_delay_off_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t size)
{
	struct led_classdev *led_cdev = led_trigger_get_led(dev);
	unsigned long state;
	int ret;

	ret = kstrtoul(buf, 0, &state);
	if (ret)
		return ret;

Annotation

Implementation Notes