Commit 03f613f0 authored by Lubomir Rintel's avatar Lubomir Rintel Committed by Pavel Machek
Browse files

leds: ariel: Add driver for status LEDs on Dell Wyse 3020 



This adds support for controlling the LEDs attached to the Embedded
Controller on a Dell Wyse 3020 "Ariel" board.

Signed-off-by: default avatarLubomir Rintel <lkundrak@v3.sk>
Signed-off-by: default avatarPavel Machek <pavel@ucw.cz>
parent 44c606b0

drivers/leds/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -83,6 +83,17 @@ config LEDS_APU 
	  To compile this driver as a module, choose M here: the

	  module will be called leds-apu.



config LEDS_ARIEL

	tristate "Dell Wyse 3020 status LED support"

	depends on LEDS_CLASS

	depends on (MACH_MMP3_DT && MFD_ENE_KB3930) || COMPILE_TEST

	help

	  This driver adds support for controlling the front panel status

	  LEDs on Dell Wyse 3020 (Ariel) board via the KB3930 Embedded

	  Controller.



	  Say Y to if your machine is a Dell Wyse 3020 thin client.



config LEDS_AS3645A

	tristate "AS3645A and LM3555 LED flash controllers support"

	depends on I2C && LEDS_CLASS_FLASH

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o 
obj-$(CONFIG_LEDS_ADP5520)		+= leds-adp5520.o

obj-$(CONFIG_LEDS_AN30259A)		+= leds-an30259a.o

obj-$(CONFIG_LEDS_APU)			+= leds-apu.o

obj-$(CONFIG_LEDS_ARIEL)		+= leds-ariel.o

obj-$(CONFIG_LEDS_AS3645A)		+= leds-as3645a.o

obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o

obj-$(CONFIG_LEDS_BCM6328)		+= leds-bcm6328.o

drivers/leds/leds-ariel.c

0 → 100644
+133 −0
Original line number Diff line number Diff line 
// 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");