drivers/leds/trigger/ledtrig-timer.c

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

File Facts

System
Linux kernel
Corpus path
drivers/leds/trigger/ledtrig-timer.c
Extension
.c
Size
3218 bytes
Lines
136
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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LED Kernel Timer Trigger
 *
 * Copyright 2005-2006 Openedhand Ltd.
 *
 * Author: Richard Purdie <rpurdie@openedhand.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/leds.h>

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;
	ssize_t ret;

	ret = kstrtoul(buf, 10, &state);
	if (ret)
		return ret;

	led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
	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;
	ssize_t ret;

	ret = kstrtoul(buf, 10, &state);
	if (ret)
		return ret;

	led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
	led_cdev->blink_delay_off = state;

	return size;
}

static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);

static struct attribute *timer_trig_attrs[] = {
	&dev_attr_delay_on.attr,
	&dev_attr_delay_off.attr,
	NULL
};
ATTRIBUTE_GROUPS(timer_trig);

static void pattern_init(struct led_classdev *led_cdev)
{
	u32 *pattern;
	unsigned int size = 0;

	pattern = led_get_default_pattern(led_cdev, &size);
	if (!pattern)
		return;

	if (size != 2) {
		dev_warn(led_cdev->dev,
			 "Expected 2 but got %u values for delays pattern\n",
			 size);

Annotation

Implementation Notes