target/linux/generic-2.6/files-2.6.31/drivers/leds/leds-alix.c

   1 /*
   2  * LEDs driver for PCEngines ALIX 2/3 series
   3  *
   4  * Copyright (C) 2007 Petr Liebman
   5  *
   6  * Based on leds-wrap.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/leds.h>
  17 #include <linux/err.h>
  18 #include <asm/io.h>
  19
  20 #define DRVNAME "alix-led"
  21
  22 #define ALIX_LED1_PORT          (0x6100)
  23 #define ALIX_LED1_ON            (1<<22)
  24 #define ALIX_LED1_OFF           (1<<6)
  25
  26 #define ALIX_LED2_PORT          (0x6180)
  27 #define ALIX_LED2_ON            (1<<25)
  28 #define ALIX_LED2_OFF           (1<<9)
  29
  30 #define ALIX_LED3_PORT          (0x6180)
  31 #define ALIX_LED3_ON            (1<<27)
  32 #define ALIX_LED3_OFF           (1<<11)
  33
  34
  35 static struct platform_device *pdev;
  36
  37 static void alix_led_set_1(struct led_classdev *led_cdev,
  38                 enum led_brightness value)
  39 {
  40         if (value)
  41                 outl(ALIX_LED1_ON, ALIX_LED1_PORT);
  42         else
  43                 outl(ALIX_LED1_OFF, ALIX_LED1_PORT);
  44 }
  45
  46 static void alix_led_set_2(struct led_classdev *led_cdev,
  47                 enum led_brightness value)
  48 {
  49         if (value)
  50                 outl(ALIX_LED2_ON, ALIX_LED2_PORT);
  51         else
  52                 outl(ALIX_LED2_OFF, ALIX_LED2_PORT);
  53 }
  54
  55 static void alix_led_set_3(struct led_classdev *led_cdev,
  56                 enum led_brightness value)
  57 {
  58         if (value)
  59                 outl(ALIX_LED3_ON, ALIX_LED3_PORT);
  60         else
  61                 outl(ALIX_LED3_OFF, ALIX_LED3_PORT);
  62 }
  63
  64 static struct led_classdev alix_led_1 = {
  65         .name           = "alix:1",
  66         .brightness_set = alix_led_set_1,
  67 };
  68
  69 static struct led_classdev alix_led_2 = {
  70         .name           = "alix:2",
  71         .brightness_set = alix_led_set_2,
  72 };
  73
  74 static struct led_classdev alix_led_3 = {
  75         .name           = "alix:3",
  76         .brightness_set = alix_led_set_3,
  77 };
  78
  79
  80 #ifdef CONFIG_PM
  81 static int alix_led_suspend(struct platform_device *dev,
  82                 pm_message_t state)
  83 {
  84         led_classdev_suspend(&alix_led_1);
  85         led_classdev_suspend(&alix_led_2);
  86         led_classdev_suspend(&alix_led_3);
  87         return 0;
  88 }
  89
  90 static int alix_led_resume(struct platform_device *dev)
  91 {
  92         led_classdev_resume(&alix_led_1);
  93         led_classdev_resume(&alix_led_2);
  94         led_classdev_resume(&alix_led_3);
  95         return 0;
  96 }
  97 #else
  98 #define alix_led_suspend NULL
  99 #define alix_led_resume NULL
 100 #endif
 101
 102 static int alix_led_probe(struct platform_device *pdev)
 103 {
 104         int ret;
 105
 106         ret = led_classdev_register(&pdev->dev, &alix_led_1);
 107         if (ret >= 0)
 108         {
 109                 ret = led_classdev_register(&pdev->dev, &alix_led_2);
 110                 if (ret >= 0)
 111                 {
 112                         ret = led_classdev_register(&pdev->dev, &alix_led_3);
 113                         if (ret < 0)
 114                                 led_classdev_unregister(&alix_led_2);
 115                 }
 116                 if (ret < 0)
 117                         led_classdev_unregister(&alix_led_1);
 118         }
 119         return ret;
 120 }
 121
 122 static int alix_led_remove(struct platform_device *pdev)
 123 {
 124         led_classdev_unregister(&alix_led_1);
 125         led_classdev_unregister(&alix_led_2);
 126         led_classdev_unregister(&alix_led_3);
 127         return 0;
 128 }
 129
 130 static struct platform_driver alix_led_driver = {
 131         .probe          = alix_led_probe,
 132         .remove         = alix_led_remove,
 133         .suspend        = alix_led_suspend,
 134         .resume         = alix_led_resume,
 135         .driver         = {
 136                 .name           = DRVNAME,
 137                 .owner          = THIS_MODULE,
 138         },
 139 };
 140
 141 static int __init alix_led_init(void)
 142 {
 143         int ret;
 144
 145         ret = platform_driver_register(&alix_led_driver);
 146         if (ret < 0)
 147                 goto out;
 148
 149         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
 150         if (IS_ERR(pdev)) {
 151                 ret = PTR_ERR(pdev);
 152                 platform_driver_unregister(&alix_led_driver);
 153                 goto out;
 154         }
 155
 156 out:
 157         return ret;
 158 }
 159
 160 static void __exit alix_led_exit(void)
 161 {
 162         platform_device_unregister(pdev);
 163         platform_driver_unregister(&alix_led_driver);
 164 }
 165
 166 module_init(alix_led_init);
 167 module_exit(alix_led_exit);
 168
 169 MODULE_AUTHOR("Petr Liebman");
 170 MODULE_DESCRIPTION("PCEngines ALIX LED driver");
 171 MODULE_LICENSE("GPL");
 172