drivers/leds/leds-ams-delta.c

   1 /*
   2  * LEDs driver for Amstrad Delta (E3)
   3  *
   4  * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/config.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/leds.h>
  16 #include <asm/arch/board-ams-delta.h>
  17
  18 /*
  19  * Our context
  20  */
  21 struct ams_delta_led {
  22         struct led_classdev     cdev;
  23         u8                      bitmask;
  24 };
  25
  26 static void ams_delta_led_set(struct led_classdev *led_cdev,
  27                 enum led_brightness value)
  28 {
  29         struct ams_delta_led *led_dev =
  30                 container_of(led_cdev, struct ams_delta_led, cdev);
  31
  32         if (value)
  33                 ams_delta_latch1_write(led_dev->bitmask, led_dev->bitmask);
  34         else
  35                 ams_delta_latch1_write(led_dev->bitmask, 0);
  36 }
  37
  38 static struct ams_delta_led ams_delta_leds[] = {
  39         {
  40                 .cdev           = {
  41                         .name           = "ams-delta:camera",
  42                         .brightness_set = ams_delta_led_set,
  43                 },
  44                 .bitmask        = AMS_DELTA_LATCH1_LED_CAMERA,
  45         },
  46         {
  47                 .cdev           = {
  48                         .name           = "ams-delta:advert",
  49                         .brightness_set = ams_delta_led_set,
  50                 },
  51                 .bitmask        = AMS_DELTA_LATCH1_LED_ADVERT,
  52         },
  53         {
  54                 .cdev           = {
  55                         .name           = "ams-delta:email",
  56                         .brightness_set = ams_delta_led_set,
  57                 },
  58                 .bitmask        = AMS_DELTA_LATCH1_LED_EMAIL,
  59         },
  60         {
  61                 .cdev           = {
  62                         .name           = "ams-delta:handsfree",
  63                         .brightness_set = ams_delta_led_set,
  64                 },
  65                 .bitmask        = AMS_DELTA_LATCH1_LED_HANDSFREE,
  66         },
  67         {
  68                 .cdev           = {
  69                         .name           = "ams-delta:voicemail",
  70                         .brightness_set = ams_delta_led_set,
  71                 },
  72                 .bitmask        = AMS_DELTA_LATCH1_LED_VOICEMAIL,
  73         },
  74         {
  75                 .cdev           = {
  76                         .name           = "ams-delta:voice",
  77                         .brightness_set = ams_delta_led_set,
  78                 },
  79                 .bitmask        = AMS_DELTA_LATCH1_LED_VOICE,
  80         },
  81 };
  82
  83 #ifdef CONFIG_PM
  84 static int ams_delta_led_suspend(struct platform_device *dev,
  85                 pm_message_t state)
  86 {
  87         int i;
  88
  89         for (i = 0; i < ARRAY_SIZE(ams_delta_leds); i++)
  90                 led_classdev_suspend(&ams_delta_leds[i].cdev);
  91
  92         return 0;
  93 }
  94
  95 static int ams_delta_led_resume(struct platform_device *dev)
  96 {
  97         int i;
  98
  99         for (i = 0; i < ARRAY_SIZE(ams_delta_leds); i++)
 100                 led_classdev_resume(&ams_delta_leds[i].cdev);
 101
 102         return 0;
 103 }
 104 #else
 105 #define ams_delta_led_suspend NULL
 106 #define ams_delta_led_resume NULL
 107 #endif
 108
 109 static int ams_delta_led_probe(struct platform_device *pdev)
 110 {
 111         int i;
 112         int ret;
 113
 114         for (i = ret = 0; ret >= 0 && i < ARRAY_SIZE(ams_delta_leds); i++) {
 115                 ret = led_classdev_register(&pdev->dev,
 116                                 &ams_delta_leds[i].cdev);
 117         }
 118
 119         if (ret < 0 && i > 1) {
 120                 for (i = i - 2; i >= 0; i--)
 121                         led_classdev_unregister(&ams_delta_leds[i].cdev);
 122         }
 123
 124         return ret;
 125 }
 126
 127 static int ams_delta_led_remove(struct platform_device *pdev)
 128 {
 129         int i;
 130
 131         for (i = ARRAY_SIZE(ams_delta_leds) - 1; i >= 0; i--)
 132                 led_classdev_unregister(&ams_delta_leds[i].cdev);
 133
 134         return 0;
 135 }
 136
 137 static struct platform_driver ams_delta_led_driver = {
 138         .probe          = ams_delta_led_probe,
 139         .remove         = ams_delta_led_remove,
 140         .suspend        = ams_delta_led_suspend,
 141         .resume         = ams_delta_led_resume,
 142         .driver         = {
 143                 .name = "ams-delta-led",
 144         },
 145 };
 146
 147 static int __init ams_delta_led_init(void)
 148 {
 149         return platform_driver_register(&ams_delta_led_driver);
 150 }
 151
 152 static void __exit ams_delta_led_exit(void)
 153 {
 154         return platform_driver_unregister(&ams_delta_led_driver);
 155 }
 156
 157 module_init(ams_delta_led_init);
 158 module_exit(ams_delta_led_exit);
 159
 160 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
 161 MODULE_DESCRIPTION("Amstrad Delta LED driver");
 162 MODULE_LICENSE("GPL");