// 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);
                goto out;
        }

        led_cdev->blink_delay_on = pattern[0];
        led_cdev->blink_delay_off = pattern[1];
        /* led_blink_set() called by caller */

out:
        kfree(pattern);
}

static int timer_trig_activate(struct led_classdev *led_cdev)
{
        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;
        }

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

        return 0;
}

static void timer_trig_deactivate(struct led_classdev *led_cdev)
{
        /* Stop blinking */
        led_set_brightness(led_cdev, LED_OFF);
}

static struct led_trigger timer_led_trigger = {
        .name     = "timer",
        .activate = timer_trig_activate,
        .deactivate = timer_trig_deactivate,
        .groups = timer_trig_groups,
};
module_led_trigger(timer_led_trigger);

MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
MODULE_DESCRIPTION("Timer LED trigger");
MODULE_LICENSE("GPL v2");