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// SPDX-License-Identifier: GPL-2.0
/*
* Activity/power trigger
*
* Copyright (C) 2020 Raspberry Pi (Trading) Ltd.
*
* Based on Atsushi Nemoto's ledtrig-heartbeat.c, although there may be
* nothing left of the original now.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/leds.h>
#include "../leds.h"
enum {
TRIG_ACT,
TRIG_PWR,
TRIG_COUNT
};
struct actpwr_trig_src {
const char *name;
int interval;
bool invert;
};
struct actpwr_vled {
struct led_classdev cdev;
struct actpwr_trig_data *parent;
enum led_brightness value;
unsigned int interval;
bool invert;
};
struct actpwr_trig_data {
struct led_trigger trig;
struct actpwr_vled virt_leds[TRIG_COUNT];
struct actpwr_vled *active;
struct timer_list timer;
int next_active;
};
static int actpwr_trig_activate(struct led_classdev *led_cdev);
static void actpwr_trig_deactivate(struct led_classdev *led_cdev);
static const struct actpwr_trig_src actpwr_trig_sources[TRIG_COUNT] = {
[TRIG_ACT] = { "mmc0", 500, true },
[TRIG_PWR] = { "default-on", 500, false },
};
static struct actpwr_trig_data actpwr_data = {
{
.name = "actpwr",
.activate = actpwr_trig_activate,
.deactivate = actpwr_trig_deactivate,
}
};
static void actpwr_brightness_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct actpwr_vled *vled = container_of(led_cdev, struct actpwr_vled,
cdev);
struct actpwr_trig_data *trig = vled->parent;
if (vled->invert)
value = !value;
vled->value = value;
if (vled == trig->active)
led_trigger_event(&trig->trig, value);
}
static int actpwr_brightness_set_blocking(struct led_classdev *led_cdev,
enum led_brightness value)
{
actpwr_brightness_set(led_cdev, value);
return 0;
}
static enum led_brightness actpwr_brightness_get(struct led_classdev *led_cdev)
{
struct actpwr_vled *vled = container_of(led_cdev, struct actpwr_vled,
cdev);
return vled->value;
}
static void actpwr_trig_cycle(struct timer_list *t)
{
struct actpwr_trig_data *trig = &actpwr_data;
struct actpwr_vled *active;
active = &trig->virt_leds[trig->next_active];
trig->active = active;
trig->next_active = (trig->next_active + 1) % TRIG_COUNT;
led_trigger_event(&trig->trig, active->value);
mod_timer(&trig->timer, jiffies + msecs_to_jiffies(active->interval));
}
static int actpwr_trig_activate(struct led_classdev *led_cdev)
{
struct actpwr_trig_data *trig = &actpwr_data;
/* Start the timer if this is the first LED */
if (!trig->active)
actpwr_trig_cycle(&trig->timer);
else
led_set_brightness_nosleep(led_cdev, trig->active->value);
return 0;
}
static void actpwr_trig_deactivate(struct led_classdev *led_cdev)
{
struct actpwr_trig_data *trig = &actpwr_data;
if (list_empty(&trig->trig.led_cdevs)) {
timer_delete_sync(&trig->timer);
trig->active = NULL;
}
}
static int __init actpwr_trig_init(void)
{
struct actpwr_trig_data *trig = &actpwr_data;
int ret = 0;
int i;
timer_setup(&trig->timer, actpwr_trig_cycle, 0);
/* Register one "LED" for each source trigger */
for (i = 0; i < TRIG_COUNT; i++)
{
struct actpwr_vled *vled = &trig->virt_leds[i];
struct led_classdev *cdev = &vled->cdev;
const struct actpwr_trig_src *src = &actpwr_trig_sources[i];
vled->parent = trig;
vled->interval = src->interval;
vled->invert = src->invert;
cdev->name = src->name;
cdev->brightness_set = actpwr_brightness_set;
cdev->brightness_set_blocking = actpwr_brightness_set_blocking;
cdev->brightness_get = actpwr_brightness_get;
cdev->default_trigger = src->name;
ret = led_classdev_register(NULL, cdev);
if (ret)
goto error_classdev;
}
ret = led_trigger_register(&trig->trig);
if (ret)
goto error_classdev;
return 0;
error_classdev:
while (i > 0)
{
i--;
led_classdev_unregister(&trig->virt_leds[i].cdev);
}
return ret;
}
static void __exit actpwr_trig_exit(void)
{
int i;
led_trigger_unregister(&actpwr_data.trig);
for (i = 0; i < TRIG_COUNT; i++)
{
led_classdev_unregister(&actpwr_data.virt_leds[i].cdev);
}
}
module_init(actpwr_trig_init);
module_exit(actpwr_trig_exit);
MODULE_AUTHOR("Phil Elwell <phil@raspberrypi.com>");
MODULE_DESCRIPTION("ACT/PWR LED trigger");
MODULE_LICENSE("GPL v2");
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