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