134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-or-later
|
|
/*
|
|
* Dell Wyse 3020 a.k.a. "Ariel" Embedded Controller LED Driver
|
|
*
|
|
* Copyright (C) 2020 Lubomir Rintel
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
enum ec_index {
|
|
EC_BLUE_LED = 0x01,
|
|
EC_AMBER_LED = 0x02,
|
|
EC_GREEN_LED = 0x03,
|
|
};
|
|
|
|
enum {
|
|
EC_LED_OFF = 0x00,
|
|
EC_LED_STILL = 0x01,
|
|
EC_LED_FADE = 0x02,
|
|
EC_LED_BLINK = 0x03,
|
|
};
|
|
|
|
struct ariel_led {
|
|
struct regmap *ec_ram;
|
|
enum ec_index ec_index;
|
|
struct led_classdev led_cdev;
|
|
};
|
|
|
|
#define led_cdev_to_ariel_led(c) container_of(c, struct ariel_led, led_cdev)
|
|
|
|
static enum led_brightness ariel_led_get(struct led_classdev *led_cdev)
|
|
{
|
|
struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
|
|
unsigned int led_status = 0;
|
|
|
|
if (regmap_read(led->ec_ram, led->ec_index, &led_status))
|
|
return LED_OFF;
|
|
|
|
if (led_status == EC_LED_STILL)
|
|
return LED_FULL;
|
|
else
|
|
return LED_OFF;
|
|
}
|
|
|
|
static void ariel_led_set(struct led_classdev *led_cdev,
|
|
enum led_brightness brightness)
|
|
{
|
|
struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
|
|
|
|
if (brightness == LED_OFF)
|
|
regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF);
|
|
else
|
|
regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL);
|
|
}
|
|
|
|
static int ariel_blink_set(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on, unsigned long *delay_off)
|
|
{
|
|
struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
|
|
|
|
if (*delay_on == 0 && *delay_off == 0)
|
|
return -EINVAL;
|
|
|
|
if (*delay_on == 0) {
|
|
regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF);
|
|
} else if (*delay_off == 0) {
|
|
regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL);
|
|
} else {
|
|
*delay_on = 500;
|
|
*delay_off = 500;
|
|
regmap_write(led->ec_ram, led->ec_index, EC_LED_BLINK);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define NLEDS 3
|
|
|
|
static int ariel_led_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct ariel_led *leds;
|
|
struct regmap *ec_ram;
|
|
int ret;
|
|
int i;
|
|
|
|
ec_ram = dev_get_regmap(dev->parent, "ec_ram");
|
|
if (!ec_ram)
|
|
return -ENODEV;
|
|
|
|
leds = devm_kcalloc(dev, NLEDS, sizeof(*leds), GFP_KERNEL);
|
|
if (!leds)
|
|
return -ENOMEM;
|
|
|
|
leds[0].ec_index = EC_BLUE_LED;
|
|
leds[0].led_cdev.name = "blue:power";
|
|
leds[0].led_cdev.default_trigger = "default-on";
|
|
|
|
leds[1].ec_index = EC_AMBER_LED;
|
|
leds[1].led_cdev.name = "amber:status";
|
|
|
|
leds[2].ec_index = EC_GREEN_LED;
|
|
leds[2].led_cdev.name = "green:status";
|
|
leds[2].led_cdev.default_trigger = "default-on";
|
|
|
|
for (i = 0; i < NLEDS; i++) {
|
|
leds[i].ec_ram = ec_ram;
|
|
leds[i].led_cdev.brightness_get = ariel_led_get;
|
|
leds[i].led_cdev.brightness_set = ariel_led_set;
|
|
leds[i].led_cdev.blink_set = ariel_blink_set;
|
|
|
|
ret = devm_led_classdev_register(dev, &leds[i].led_cdev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ariel_led_driver = {
|
|
.probe = ariel_led_probe,
|
|
.driver = {
|
|
.name = "dell-wyse-ariel-led",
|
|
},
|
|
};
|
|
module_platform_driver(ariel_led_driver);
|
|
|
|
MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
|
|
MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|