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133 lines
3.0 KiB
133 lines
3.0 KiB
// 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 <[email protected]>"); |
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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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