LXR linux/drivers/leds/leds-net48xx.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * LEDs driver for Soekris net48xx
   4 *
   5 * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
   6 *
   7 * Based on leds-ams-delta.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/nsc_gpio.h>
  17#include <linux/scx200_gpio.h>
  18#include <linux/module.h>
  19
  20#define DRVNAME "net48xx-led"
  21#define NET48XX_ERROR_LED_GPIO  20
  22
  23static struct platform_device *pdev;
  24
  25static void net48xx_error_led_set(struct led_classdev *led_cdev,
  26                enum led_brightness value)
  27{
  28        scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
  29}
  30
  31static struct led_classdev net48xx_error_led = {
  32        .name           = "net48xx::error",
  33        .brightness_set = net48xx_error_led_set,
  34        .flags          = LED_CORE_SUSPENDRESUME,
  35};
  36
  37static int net48xx_led_probe(struct platform_device *pdev)
  38{
  39        return devm_led_classdev_register(&pdev->dev, &net48xx_error_led);
  40}
  41
  42static struct platform_driver net48xx_led_driver = {
  43        .probe          = net48xx_led_probe,
  44        .driver         = {
  45                .name           = DRVNAME,
  46        },
  47};
  48
  49static int __init net48xx_led_init(void)
  50{
  51        int ret;
  52
  53        /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
  54        if (!scx200_gpio_ops.dev) {
  55                ret = -ENODEV;
  56                goto out;
  57        }
  58
  59        ret = platform_driver_register(&net48xx_led_driver);
  60        if (ret < 0)
  61                goto out;
  62
  63        pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  64        if (IS_ERR(pdev)) {
  65                ret = PTR_ERR(pdev);
  66                platform_driver_unregister(&net48xx_led_driver);
  67                goto out;
  68        }
  69
  70out:
  71        return ret;
  72}
  73
  74static void __exit net48xx_led_exit(void)
  75{
  76        platform_device_unregister(pdev);
  77        platform_driver_unregister(&net48xx_led_driver);
  78}
  79
  80module_init(net48xx_led_init);
  81module_exit(net48xx_led_exit);
  82
  83MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
  84MODULE_DESCRIPTION("Soekris net48xx LED driver");
  85MODULE_LICENSE("GPL");
  86
  87