cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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leds-wrap.c (2787B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * LEDs driver for PCEngines WRAP
      4 *
      5 * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
      6 *
      7 * Based on leds-net48xx.c
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/init.h>
     12#include <linux/platform_device.h>
     13#include <linux/leds.h>
     14#include <linux/err.h>
     15#include <linux/io.h>
     16#include <linux/scx200_gpio.h>
     17#include <linux/module.h>
     18
     19#define DRVNAME "wrap-led"
     20#define WRAP_POWER_LED_GPIO	2
     21#define WRAP_ERROR_LED_GPIO	3
     22#define WRAP_EXTRA_LED_GPIO	18
     23
     24static struct platform_device *pdev;
     25
     26static void wrap_power_led_set(struct led_classdev *led_cdev,
     27		enum led_brightness value)
     28{
     29	if (value)
     30		scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
     31	else
     32		scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
     33}
     34
     35static void wrap_error_led_set(struct led_classdev *led_cdev,
     36		enum led_brightness value)
     37{
     38	if (value)
     39		scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
     40	else
     41		scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
     42}
     43
     44static void wrap_extra_led_set(struct led_classdev *led_cdev,
     45		enum led_brightness value)
     46{
     47	if (value)
     48		scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
     49	else
     50		scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
     51}
     52
     53static struct led_classdev wrap_power_led = {
     54	.name			= "wrap::power",
     55	.brightness_set		= wrap_power_led_set,
     56	.default_trigger	= "default-on",
     57	.flags			= LED_CORE_SUSPENDRESUME,
     58};
     59
     60static struct led_classdev wrap_error_led = {
     61	.name		= "wrap::error",
     62	.brightness_set	= wrap_error_led_set,
     63	.flags			= LED_CORE_SUSPENDRESUME,
     64};
     65
     66static struct led_classdev wrap_extra_led = {
     67	.name           = "wrap::extra",
     68	.brightness_set = wrap_extra_led_set,
     69	.flags			= LED_CORE_SUSPENDRESUME,
     70};
     71
     72static int wrap_led_probe(struct platform_device *pdev)
     73{
     74	int ret;
     75
     76	ret = devm_led_classdev_register(&pdev->dev, &wrap_power_led);
     77	if (ret < 0)
     78		return ret;
     79
     80	ret = devm_led_classdev_register(&pdev->dev, &wrap_error_led);
     81	if (ret < 0)
     82		return ret;
     83
     84	return  devm_led_classdev_register(&pdev->dev, &wrap_extra_led);
     85}
     86
     87static struct platform_driver wrap_led_driver = {
     88	.probe		= wrap_led_probe,
     89	.driver		= {
     90		.name		= DRVNAME,
     91	},
     92};
     93
     94static int __init wrap_led_init(void)
     95{
     96	int ret;
     97
     98	if (!scx200_gpio_present()) {
     99		ret = -ENODEV;
    100		goto out;
    101	}
    102
    103	ret = platform_driver_register(&wrap_led_driver);
    104	if (ret < 0)
    105		goto out;
    106
    107	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
    108	if (IS_ERR(pdev)) {
    109		ret = PTR_ERR(pdev);
    110		platform_driver_unregister(&wrap_led_driver);
    111		goto out;
    112	}
    113
    114out:
    115	return ret;
    116}
    117
    118static void __exit wrap_led_exit(void)
    119{
    120	platform_device_unregister(pdev);
    121	platform_driver_unregister(&wrap_led_driver);
    122}
    123
    124module_init(wrap_led_init);
    125module_exit(wrap_led_exit);
    126
    127MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
    128MODULE_DESCRIPTION("PCEngines WRAP LED driver");
    129MODULE_LICENSE("GPL");
    130