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// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight emulation LED trigger
*
* Copyright 2008 (C) Rodolfo Giometti <giometti@linux.it>
* Copyright 2008 (C) Eurotech S.p.A. <info@eurotech.it>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fb.h>
#include <linux/leds.h>
#include "../leds.h"
#define BLANK 1
#define UNBLANK 0
struct bl_trig_notifier {
struct led_classdev *led;
int brightness;
int old_status;
struct notifier_block notifier;
unsigned invert;
};
static int fb_notifier_callback(struct notifier_block *p,
unsigned long event, void *data)
{
struct bl_trig_notifier *n = container_of(p,
struct bl_trig_notifier, notifier);
struct led_classdev *led = n->led;
struct fb_event *fb_event = data;
int *blank;
int new_status;
/* If we aren't interested in this event, skip it immediately ... */
if (event != FB_EVENT_BLANK)
return 0;
blank = fb_event->data;
new_status = *blank ? BLANK : UNBLANK;
if (new_status == n->old_status)
return 0;
if ((n->old_status == UNBLANK) ^ n->invert) {
n->brightness = led->brightness;
led_set_brightness_nosleep(led, LED_OFF);
} else {
led_set_brightness_nosleep(led, n->brightness);
}
n->old_status = new_status;
return 0;
}
static ssize_t bl_trig_invert_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bl_trig_notifier *n = led_trigger_get_drvdata(dev);
return sprintf(buf, "%u\n", n->invert);
}
static ssize_t bl_trig_invert_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t num)
{
struct led_classdev *led = led_trigger_get_led(dev);
struct bl_trig_notifier *n = led_trigger_get_drvdata(dev);
unsigned long invert;
int ret;
ret = kstrtoul(buf, 10, &invert);
if (ret < 0)
return ret;
if (invert > 1)
return -EINVAL;
n->invert = invert;
/* After inverting, we need to update the LED. */
if ((n->old_status == BLANK) ^ n->invert)
led_set_brightness_nosleep(led, LED_OFF);
else
led_set_brightness_nosleep(led, n->brightness);
return num;
}
static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store);
static struct attribute *bl_trig_attrs[] = {
&dev_attr_inverted.attr,
NULL,
};
ATTRIBUTE_GROUPS(bl_trig);
static int bl_trig_activate(struct led_classdev *led)
{
int ret;
struct bl_trig_notifier *n;
n = kzalloc(sizeof(struct bl_trig_notifier), GFP_KERNEL);
if (!n)
return -ENOMEM;
led_set_trigger_data(led, n);
n->led = led;
n->brightness = led->brightness;
n->old_status = UNBLANK;
n->notifier.notifier_call = fb_notifier_callback;
ret = fb_register_client(&n->notifier);
if (ret)
dev_err(led->dev, "unable to register backlight trigger\n");
return 0;
}
static void bl_trig_deactivate(struct led_classdev *led)
{
struct bl_trig_notifier *n = led_get_trigger_data(led);
fb_unregister_client(&n->notifier);
kfree(n);
}
static struct led_trigger bl_led_trigger = {
.name = "backlight",
.activate = bl_trig_activate,
.deactivate = bl_trig_deactivate,
.groups = bl_trig_groups,
};
module_led_trigger(bl_led_trigger);
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("Backlight emulation LED trigger");
MODULE_LICENSE("GPL v2");
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