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03f613f057
This adds support for controlling the LEDs attached to the Embedded Controller on a Dell Wyse 3020 "Ariel" board. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Pavel Machek <pavel@ucw.cz>
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-or-later
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/*
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* Dell Wyse 3020 a.k.a. "Ariel" Embedded Controller LED Driver
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*
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* Copyright (C) 2020 Lubomir Rintel
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*/
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#include <linux/module.h>
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#include <linux/leds.h>
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#include <linux/regmap.h>
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#include <linux/of_platform.h>
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enum ec_index {
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EC_BLUE_LED = 0x01,
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EC_AMBER_LED = 0x02,
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EC_GREEN_LED = 0x03,
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};
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enum {
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EC_LED_OFF = 0x00,
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EC_LED_STILL = 0x01,
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EC_LED_FADE = 0x02,
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EC_LED_BLINK = 0x03,
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};
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struct ariel_led {
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struct regmap *ec_ram;
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enum ec_index ec_index;
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struct led_classdev led_cdev;
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};
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#define led_cdev_to_ariel_led(c) container_of(c, struct ariel_led, led_cdev)
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static enum led_brightness ariel_led_get(struct led_classdev *led_cdev)
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{
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struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
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unsigned int led_status = 0;
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if (regmap_read(led->ec_ram, led->ec_index, &led_status))
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return LED_OFF;
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if (led_status == EC_LED_STILL)
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return LED_FULL;
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else
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return LED_OFF;
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}
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static void ariel_led_set(struct led_classdev *led_cdev,
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enum led_brightness brightness)
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{
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struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
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if (brightness == LED_OFF)
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regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF);
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else
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regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL);
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}
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static int ariel_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
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if (*delay_on == 0 && *delay_off == 0)
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return -EINVAL;
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if (*delay_on == 0) {
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regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF);
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} else if (*delay_off == 0) {
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regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL);
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} else {
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*delay_on = 500;
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*delay_off = 500;
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regmap_write(led->ec_ram, led->ec_index, EC_LED_BLINK);
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}
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return 0;
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}
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#define NLEDS 3
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static int ariel_led_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ariel_led *leds;
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struct regmap *ec_ram;
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int ret;
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int i;
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ec_ram = dev_get_regmap(dev->parent, "ec_ram");
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if (!ec_ram)
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return -ENODEV;
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leds = devm_kcalloc(dev, NLEDS, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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leds[0].ec_index = EC_BLUE_LED;
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leds[0].led_cdev.name = "blue:power",
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leds[0].led_cdev.default_trigger = "default-on";
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leds[1].ec_index = EC_AMBER_LED;
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leds[1].led_cdev.name = "amber:status",
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leds[2].ec_index = EC_GREEN_LED;
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leds[2].led_cdev.name = "green:status",
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leds[2].led_cdev.default_trigger = "default-on";
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for (i = 0; i < NLEDS; i++) {
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leds[i].ec_ram = ec_ram;
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leds[i].led_cdev.brightness_get = ariel_led_get;
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leds[i].led_cdev.brightness_set = ariel_led_set;
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leds[i].led_cdev.blink_set = ariel_blink_set;
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ret = devm_led_classdev_register(dev, &leds[i].led_cdev);
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if (ret)
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return ret;
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}
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return 0;
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}
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static struct platform_driver ariel_led_driver = {
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.probe = ariel_led_probe,
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.driver = {
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.name = "dell-wyse-ariel-led",
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},
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};
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module_platform_driver(ariel_led_driver);
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MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
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MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver");
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MODULE_LICENSE("Dual BSD/GPL");
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