drivers/leds/leds-cobalt-raq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  LEDs driver for the Cobalt Raq series.
   4  *
   5  *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
   6  */
   7 #include <linux/init.h>
   8 #include <linux/io.h>
   9 #include <linux/ioport.h>
  10 #include <linux/leds.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/types.h>
  14 #include <linux/export.h>
  15
  16 #define LED_WEB         0x04
  17 #define LED_POWER_OFF   0x08
  18
  19 static void __iomem *led_port;
  20 static u8 led_value;
  21 static DEFINE_SPINLOCK(led_value_lock);
  22
  23 static void raq_web_led_set(struct led_classdev *led_cdev,
  24                             enum led_brightness brightness)
  25 {
  26         unsigned long flags;
  27
  28         spin_lock_irqsave(&led_value_lock, flags);
  29
  30         if (brightness)
  31                 led_value |= LED_WEB;
  32         else
  33                 led_value &= ~LED_WEB;
  34         writeb(led_value, led_port);
  35
  36         spin_unlock_irqrestore(&led_value_lock, flags);
  37 }
  38
  39 static struct led_classdev raq_web_led = {
  40         .name           = "raq::web",
  41         .brightness_set = raq_web_led_set,
  42 };
  43
  44 static void raq_power_off_led_set(struct led_classdev *led_cdev,
  45                                   enum led_brightness brightness)
  46 {
  47         unsigned long flags;
  48
  49         spin_lock_irqsave(&led_value_lock, flags);
  50
  51         if (brightness)
  52                 led_value |= LED_POWER_OFF;
  53         else
  54                 led_value &= ~LED_POWER_OFF;
  55         writeb(led_value, led_port);
  56
  57         spin_unlock_irqrestore(&led_value_lock, flags);
  58 }
  59
  60 static struct led_classdev raq_power_off_led = {
  61         .name                   = "raq::power-off",
  62         .brightness_set         = raq_power_off_led_set,
  63         .default_trigger        = "power-off",
  64 };
  65
  66 static int cobalt_raq_led_probe(struct platform_device *pdev)
  67 {
  68         struct resource *res;
  69         int retval;
  70
  71         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  72         if (!res)
  73                 return -EBUSY;
  74
  75         led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
  76         if (!led_port)
  77                 return -ENOMEM;
  78
  79         retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
  80         if (retval)
  81                 goto err_null;
  82
  83         retval = led_classdev_register(&pdev->dev, &raq_web_led);
  84         if (retval)
  85                 goto err_unregister;
  86
  87         return 0;
  88
  89 err_unregister:
  90         led_classdev_unregister(&raq_power_off_led);
  91
  92 err_null:
  93         led_port = NULL;
  94
  95         return retval;
  96 }
  97
  98 static struct platform_driver cobalt_raq_led_driver = {
  99         .probe  = cobalt_raq_led_probe,
 100         .driver = {
 101                 .name   = "cobalt-raq-leds",
 102         },
 103 };
 104
 105 builtin_platform_driver(cobalt_raq_led_driver);