103f613f0SLubomir Rintel // SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-or-later
203f613f0SLubomir Rintel /*
303f613f0SLubomir Rintel * Dell Wyse 3020 a.k.a. "Ariel" Embedded Controller LED Driver
403f613f0SLubomir Rintel *
503f613f0SLubomir Rintel * Copyright (C) 2020 Lubomir Rintel
603f613f0SLubomir Rintel */
703f613f0SLubomir Rintel
803f613f0SLubomir Rintel #include <linux/module.h>
903f613f0SLubomir Rintel #include <linux/leds.h>
10*3192f141SRob Herring #include <linux/platform_device.h>
1103f613f0SLubomir Rintel #include <linux/regmap.h>
1203f613f0SLubomir Rintel
1303f613f0SLubomir Rintel enum ec_index {
1403f613f0SLubomir Rintel EC_BLUE_LED = 0x01,
1503f613f0SLubomir Rintel EC_AMBER_LED = 0x02,
1603f613f0SLubomir Rintel EC_GREEN_LED = 0x03,
1703f613f0SLubomir Rintel };
1803f613f0SLubomir Rintel
1903f613f0SLubomir Rintel enum {
2003f613f0SLubomir Rintel EC_LED_OFF = 0x00,
2103f613f0SLubomir Rintel EC_LED_STILL = 0x01,
2203f613f0SLubomir Rintel EC_LED_FADE = 0x02,
2303f613f0SLubomir Rintel EC_LED_BLINK = 0x03,
2403f613f0SLubomir Rintel };
2503f613f0SLubomir Rintel
2603f613f0SLubomir Rintel struct ariel_led {
2703f613f0SLubomir Rintel struct regmap *ec_ram;
2803f613f0SLubomir Rintel enum ec_index ec_index;
2903f613f0SLubomir Rintel struct led_classdev led_cdev;
3003f613f0SLubomir Rintel };
3103f613f0SLubomir Rintel
3203f613f0SLubomir Rintel #define led_cdev_to_ariel_led(c) container_of(c, struct ariel_led, led_cdev)
3303f613f0SLubomir Rintel
ariel_led_get(struct led_classdev * led_cdev)3403f613f0SLubomir Rintel static enum led_brightness ariel_led_get(struct led_classdev *led_cdev)
3503f613f0SLubomir Rintel {
3603f613f0SLubomir Rintel struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
3703f613f0SLubomir Rintel unsigned int led_status = 0;
3803f613f0SLubomir Rintel
3903f613f0SLubomir Rintel if (regmap_read(led->ec_ram, led->ec_index, &led_status))
4003f613f0SLubomir Rintel return LED_OFF;
4103f613f0SLubomir Rintel
4203f613f0SLubomir Rintel if (led_status == EC_LED_STILL)
4303f613f0SLubomir Rintel return LED_FULL;
4403f613f0SLubomir Rintel else
4503f613f0SLubomir Rintel return LED_OFF;
4603f613f0SLubomir Rintel }
4703f613f0SLubomir Rintel
ariel_led_set(struct led_classdev * led_cdev,enum led_brightness brightness)4803f613f0SLubomir Rintel static void ariel_led_set(struct led_classdev *led_cdev,
4903f613f0SLubomir Rintel enum led_brightness brightness)
5003f613f0SLubomir Rintel {
5103f613f0SLubomir Rintel struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
5203f613f0SLubomir Rintel
5303f613f0SLubomir Rintel if (brightness == LED_OFF)
5403f613f0SLubomir Rintel regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF);
5503f613f0SLubomir Rintel else
5603f613f0SLubomir Rintel regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL);
5703f613f0SLubomir Rintel }
5803f613f0SLubomir Rintel
ariel_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)5903f613f0SLubomir Rintel static int ariel_blink_set(struct led_classdev *led_cdev,
6003f613f0SLubomir Rintel unsigned long *delay_on, unsigned long *delay_off)
6103f613f0SLubomir Rintel {
6203f613f0SLubomir Rintel struct ariel_led *led = led_cdev_to_ariel_led(led_cdev);
6303f613f0SLubomir Rintel
6403f613f0SLubomir Rintel if (*delay_on == 0 && *delay_off == 0)
6503f613f0SLubomir Rintel return -EINVAL;
6603f613f0SLubomir Rintel
6703f613f0SLubomir Rintel if (*delay_on == 0) {
6803f613f0SLubomir Rintel regmap_write(led->ec_ram, led->ec_index, EC_LED_OFF);
6903f613f0SLubomir Rintel } else if (*delay_off == 0) {
7003f613f0SLubomir Rintel regmap_write(led->ec_ram, led->ec_index, EC_LED_STILL);
7103f613f0SLubomir Rintel } else {
7203f613f0SLubomir Rintel *delay_on = 500;
7303f613f0SLubomir Rintel *delay_off = 500;
7403f613f0SLubomir Rintel regmap_write(led->ec_ram, led->ec_index, EC_LED_BLINK);
7503f613f0SLubomir Rintel }
7603f613f0SLubomir Rintel
7703f613f0SLubomir Rintel return 0;
7803f613f0SLubomir Rintel }
7903f613f0SLubomir Rintel
8003f613f0SLubomir Rintel #define NLEDS 3
8103f613f0SLubomir Rintel
ariel_led_probe(struct platform_device * pdev)8203f613f0SLubomir Rintel static int ariel_led_probe(struct platform_device *pdev)
8303f613f0SLubomir Rintel {
8403f613f0SLubomir Rintel struct device *dev = &pdev->dev;
8503f613f0SLubomir Rintel struct ariel_led *leds;
8603f613f0SLubomir Rintel struct regmap *ec_ram;
8703f613f0SLubomir Rintel int ret;
8803f613f0SLubomir Rintel int i;
8903f613f0SLubomir Rintel
9003f613f0SLubomir Rintel ec_ram = dev_get_regmap(dev->parent, "ec_ram");
9103f613f0SLubomir Rintel if (!ec_ram)
9203f613f0SLubomir Rintel return -ENODEV;
9303f613f0SLubomir Rintel
9403f613f0SLubomir Rintel leds = devm_kcalloc(dev, NLEDS, sizeof(*leds), GFP_KERNEL);
9503f613f0SLubomir Rintel if (!leds)
9603f613f0SLubomir Rintel return -ENOMEM;
9703f613f0SLubomir Rintel
9803f613f0SLubomir Rintel leds[0].ec_index = EC_BLUE_LED;
9947854d2dSZheng Yongjun leds[0].led_cdev.name = "blue:power";
10003f613f0SLubomir Rintel leds[0].led_cdev.default_trigger = "default-on";
10103f613f0SLubomir Rintel
10203f613f0SLubomir Rintel leds[1].ec_index = EC_AMBER_LED;
10347854d2dSZheng Yongjun leds[1].led_cdev.name = "amber:status";
10403f613f0SLubomir Rintel
10503f613f0SLubomir Rintel leds[2].ec_index = EC_GREEN_LED;
10647854d2dSZheng Yongjun leds[2].led_cdev.name = "green:status";
10703f613f0SLubomir Rintel leds[2].led_cdev.default_trigger = "default-on";
10803f613f0SLubomir Rintel
10903f613f0SLubomir Rintel for (i = 0; i < NLEDS; i++) {
11003f613f0SLubomir Rintel leds[i].ec_ram = ec_ram;
11103f613f0SLubomir Rintel leds[i].led_cdev.brightness_get = ariel_led_get;
11203f613f0SLubomir Rintel leds[i].led_cdev.brightness_set = ariel_led_set;
11303f613f0SLubomir Rintel leds[i].led_cdev.blink_set = ariel_blink_set;
11403f613f0SLubomir Rintel
11503f613f0SLubomir Rintel ret = devm_led_classdev_register(dev, &leds[i].led_cdev);
11603f613f0SLubomir Rintel if (ret)
11703f613f0SLubomir Rintel return ret;
11803f613f0SLubomir Rintel }
11903f613f0SLubomir Rintel
12003f613f0SLubomir Rintel return 0;
12103f613f0SLubomir Rintel }
12203f613f0SLubomir Rintel
12303f613f0SLubomir Rintel static struct platform_driver ariel_led_driver = {
12403f613f0SLubomir Rintel .probe = ariel_led_probe,
12503f613f0SLubomir Rintel .driver = {
12603f613f0SLubomir Rintel .name = "dell-wyse-ariel-led",
12703f613f0SLubomir Rintel },
12803f613f0SLubomir Rintel };
12903f613f0SLubomir Rintel module_platform_driver(ariel_led_driver);
13003f613f0SLubomir Rintel
13103f613f0SLubomir Rintel MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
13203f613f0SLubomir Rintel MODULE_DESCRIPTION("Dell Wyse 3020 Status LEDs Driver");
13303f613f0SLubomir Rintel MODULE_LICENSE("Dual BSD/GPL");
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