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// SPDX-License-Identifier: GPL-2.0-only
/*
* One-shot LED Trigger
*
* Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
*
* Based on ledtrig-timer.c by 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>
#include "../leds.h"
#define DEFAULT_DELAY 100
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;
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 DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
static DEVICE_ATTR(shot, 0200, NULL, led_shot);
static struct attribute *oneshot_trig_attrs[] = {
&dev_attr_delay_on.attr,
&dev_attr_delay_off.attr,
&dev_attr_invert.attr,
&dev_attr_shot.attr,
NULL
};
ATTRIBUTE_GROUPS(oneshot_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)
goto out_default;
if (size != 2) {
dev_warn(led_cdev->dev,
"Expected 2 but got %u values for delays pattern\n",
size);
goto out_default;
}
led_cdev->blink_delay_on = pattern[0];
led_cdev->blink_delay_off = pattern[1];
kfree(pattern);
return;
out_default:
kfree(pattern);
led_cdev->blink_delay_on = DEFAULT_DELAY;
led_cdev->blink_delay_off = DEFAULT_DELAY;
}
static int oneshot_trig_activate(struct led_classdev *led_cdev)
{
struct oneshot_trig_data *oneshot_data;
oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
if (!oneshot_data)
return -ENOMEM;
led_set_trigger_data(led_cdev, oneshot_data);
if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
pattern_init(led_cdev);
/*
* Mark as initialized even on pattern_init() error because
* any consecutive call to it would produce the same error.
*/
led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
}
return 0;
}
static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
{
struct oneshot_trig_data *oneshot_data = led_get_trigger_data(led_cdev);
kfree(oneshot_data);
/* Stop blinking */
led_set_brightness(led_cdev, LED_OFF);
}
static struct led_trigger oneshot_led_trigger = {
.name = "oneshot",
.activate = oneshot_trig_activate,
.deactivate = oneshot_trig_deactivate,
.groups = oneshot_trig_groups,
};
module_led_trigger(oneshot_led_trigger);
MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>");
MODULE_DESCRIPTION("One-shot LED trigger");
MODULE_LICENSE("GPL v2");
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