Orange Pi5 kernel

// 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");