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@xxxxx> --- The associated MFD driver is here: https://lore.kernel.org/lkml/20200309203818.31266-5-lkundrak@xxxxx/ drivers/leds/Kconfig | 11 +++ drivers/leds/Makefile | 1 + drivers/leds/leds-ariel.c | 144 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 156 insertions(+) create mode 100644 drivers/leds/leds-ariel.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index d82f1dea37111..66424ee54cc01 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -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 diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d7e1107753fb1..bf3b22038d113 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o obj-$(CONFIG_LEDS_APU) += leds-apu.o +obj-$(CONFIG_LEDS_ARIEL) += leds-ariel.o obj-$(CONFIG_LEDS_AS3645A) += leds-as3645a.o obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o obj-$(CONFIG_LEDS_BCM6328) += leds-bcm6328.o diff --git a/drivers/leds/leds-ariel.c b/drivers/leds/leds-ariel.c new file mode 100644 index 0000000000000..d2c11761f0301 --- /dev/null +++ b/drivers/leds/leds-ariel.c @@ -0,0 +1,144 @@ +// 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; +} + +static int ariel_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ariel_led *leds; + struct regmap *ec_ram; + int ret; + + leds = devm_kcalloc(dev, 3, sizeof(*leds), GFP_KERNEL); + if (!leds) + return -ENOMEM; + + ec_ram = dev_get_regmap(dev->parent, "ec_ram"); + if (!ec_ram) + return -ENODEV; + + leds[0].ec_ram = ec_ram; + leds[0].ec_index = EC_BLUE_LED; + leds[0].led_cdev.name = "ariel:blue:power", + leds[0].led_cdev.brightness_get = ariel_led_get; + leds[0].led_cdev.brightness_set = ariel_led_set; + leds[0].led_cdev.blink_set = ariel_blink_set; + leds[0].led_cdev.default_trigger = "default-on"; + + ret = devm_led_classdev_register(dev, &leds[0].led_cdev); + if (ret) + return ret; + + leds[1].ec_ram = ec_ram; + leds[1].ec_index = EC_AMBER_LED; + leds[1].led_cdev.name = "ariel:amber:status", + leds[1].led_cdev.brightness_get = ariel_led_get; + leds[1].led_cdev.brightness_set = ariel_led_set; + leds[1].led_cdev.blink_set = ariel_blink_set; + + ret = devm_led_classdev_register(dev, &leds[1].led_cdev); + if (ret) + return ret; + + leds[2].ec_ram = ec_ram; + leds[2].ec_index = EC_GREEN_LED; + leds[2].led_cdev.name = "ariel:green:status", + leds[2].led_cdev.brightness_get = ariel_led_get; + leds[2].led_cdev.brightness_set = ariel_led_set; + leds[2].led_cdev.blink_set = ariel_blink_set; + leds[2].led_cdev.default_trigger = "default-on"; + + ret = devm_led_classdev_register(dev, &leds[2].led_cdev); + if (ret) + return ret; + + dev_info(dev, "Dell Wyse 3020 LEDs\n"); + 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@xxxxx>"); +MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver"); +MODULE_LICENSE("Dual BSD/GPL"); -- 2.25.1
