release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/leds/leds-fsg.c

   1 /*
   2  * LED Driver for the Freecom FSG-3
   3  *
   4  * Copyright (c) 2008 Rod Whitby <rod@whitby.id.au>
   5  *
   6  * Author: Rod Whitby <rod@whitby.id.au>
   7  *
   8  * Based on leds-spitz.c
   9  * Copyright 2005-2006 Openedhand Ltd.
  10  * Author: Richard Purdie <rpurdie@openedhand.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/leds.h>
  22 #include <mach/hardware.h>
  23 #include <asm/io.h>
  24
  25 #define FSG_LED_WLAN_BIT        0
  26 #define FSG_LED_WAN_BIT         1
  27 #define FSG_LED_SATA_BIT        2
  28 #define FSG_LED_USB_BIT         4
  29 #define FSG_LED_RING_BIT        5
  30 #define FSG_LED_SYNC_BIT        7
  31
  32 static short __iomem *latch_address;
  33 static unsigned short latch_value;
  34
  35
  36 static void fsg_led_wlan_set(struct led_classdev *led_cdev,
  37                              enum led_brightness value)
  38 {
  39         if (value) {
  40                 latch_value &= ~(1 << FSG_LED_WLAN_BIT);
  41                 *latch_address = latch_value;
  42         } else {
  43                 latch_value |=  (1 << FSG_LED_WLAN_BIT);
  44                 *latch_address = latch_value;
  45         }
  46 }
  47
  48 static void fsg_led_wan_set(struct led_classdev *led_cdev,
  49                             enum led_brightness value)
  50 {
  51         if (value) {
  52                 latch_value &= ~(1 << FSG_LED_WAN_BIT);
  53                 *latch_address = latch_value;
  54         } else {
  55                 latch_value |=  (1 << FSG_LED_WAN_BIT);
  56                 *latch_address = latch_value;
  57         }
  58 }
  59
  60 static void fsg_led_sata_set(struct led_classdev *led_cdev,
  61                              enum led_brightness value)
  62 {
  63         if (value) {
  64                 latch_value &= ~(1 << FSG_LED_SATA_BIT);
  65                 *latch_address = latch_value;
  66         } else {
  67                 latch_value |=  (1 << FSG_LED_SATA_BIT);
  68                 *latch_address = latch_value;
  69         }
  70 }
  71
  72 static void fsg_led_usb_set(struct led_classdev *led_cdev,
  73                             enum led_brightness value)
  74 {
  75         if (value) {
  76                 latch_value &= ~(1 << FSG_LED_USB_BIT);
  77                 *latch_address = latch_value;
  78         } else {
  79                 latch_value |=  (1 << FSG_LED_USB_BIT);
  80                 *latch_address = latch_value;
  81         }
  82 }
  83
  84 static void fsg_led_sync_set(struct led_classdev *led_cdev,
  85                              enum led_brightness value)
  86 {
  87         if (value) {
  88                 latch_value &= ~(1 << FSG_LED_SYNC_BIT);
  89                 *latch_address = latch_value;
  90         } else {
  91                 latch_value |=  (1 << FSG_LED_SYNC_BIT);
  92                 *latch_address = latch_value;
  93         }
  94 }
  95
  96 static void fsg_led_ring_set(struct led_classdev *led_cdev,
  97                              enum led_brightness value)
  98 {
  99         if (value) {
 100                 latch_value &= ~(1 << FSG_LED_RING_BIT);
 101                 *latch_address = latch_value;
 102         } else {
 103                 latch_value |=  (1 << FSG_LED_RING_BIT);
 104                 *latch_address = latch_value;
 105         }
 106 }
 107
 108
 109 static struct led_classdev fsg_wlan_led = {
 110         .name                   = "fsg:blue:wlan",
 111         .brightness_set         = fsg_led_wlan_set,
 112         .flags                  = LED_CORE_SUSPENDRESUME,
 113 };
 114
 115 static struct led_classdev fsg_wan_led = {
 116         .name                   = "fsg:blue:wan",
 117         .brightness_set         = fsg_led_wan_set,
 118         .flags                  = LED_CORE_SUSPENDRESUME,
 119 };
 120
 121 static struct led_classdev fsg_sata_led = {
 122         .name                   = "fsg:blue:sata",
 123         .brightness_set         = fsg_led_sata_set,
 124         .flags                  = LED_CORE_SUSPENDRESUME,
 125 };
 126
 127 static struct led_classdev fsg_usb_led = {
 128         .name                   = "fsg:blue:usb",
 129         .brightness_set         = fsg_led_usb_set,
 130         .flags                  = LED_CORE_SUSPENDRESUME,
 131 };
 132
 133 static struct led_classdev fsg_sync_led = {
 134         .name                   = "fsg:blue:sync",
 135         .brightness_set         = fsg_led_sync_set,
 136         .flags                  = LED_CORE_SUSPENDRESUME,
 137 };
 138
 139 static struct led_classdev fsg_ring_led = {
 140         .name                   = "fsg:blue:ring",
 141         .brightness_set         = fsg_led_ring_set,
 142         .flags                  = LED_CORE_SUSPENDRESUME,
 143 };
 144
 145
 146 static int fsg_led_probe(struct platform_device *pdev)
 147 {
 148         int ret;
 149
 150         /* Map the LED chip select address space */
 151         latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
 152         if (!latch_address) {
 153                 ret = -ENOMEM;
 154                 goto failremap;
 155         }
 156
 157         latch_value = 0xffff;
 158         *latch_address = latch_value;
 159
 160         ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
 161         if (ret < 0)
 162                 goto failwlan;
 163
 164         ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
 165         if (ret < 0)
 166                 goto failwan;
 167
 168         ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
 169         if (ret < 0)
 170                 goto failsata;
 171
 172         ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
 173         if (ret < 0)
 174                 goto failusb;
 175
 176         ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
 177         if (ret < 0)
 178                 goto failsync;
 179
 180         ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
 181         if (ret < 0)
 182                 goto failring;
 183
 184         return ret;
 185
 186  failring:
 187         led_classdev_unregister(&fsg_sync_led);
 188  failsync:
 189         led_classdev_unregister(&fsg_usb_led);
 190  failusb:
 191         led_classdev_unregister(&fsg_sata_led);
 192  failsata:
 193         led_classdev_unregister(&fsg_wan_led);
 194  failwan:
 195         led_classdev_unregister(&fsg_wlan_led);
 196  failwlan:
 197         iounmap(latch_address);
 198  failremap:
 199
 200         return ret;
 201 }
 202
 203 static int fsg_led_remove(struct platform_device *pdev)
 204 {
 205         led_classdev_unregister(&fsg_wlan_led);
 206         led_classdev_unregister(&fsg_wan_led);
 207         led_classdev_unregister(&fsg_sata_led);
 208         led_classdev_unregister(&fsg_usb_led);
 209         led_classdev_unregister(&fsg_sync_led);
 210         led_classdev_unregister(&fsg_ring_led);
 211
 212         iounmap(latch_address);
 213
 214         return 0;
 215 }
 216
 217
 218 static struct platform_driver fsg_led_driver = {
 219         .probe          = fsg_led_probe,
 220         .remove         = fsg_led_remove,
 221         .driver         = {
 222                 .name           = "fsg-led",
 223         },
 224 };
 225
 226
 227 static int __init fsg_led_init(void)
 228 {
 229         return platform_driver_register(&fsg_led_driver);
 230 }
 231
 232 static void __exit fsg_led_exit(void)
 233 {
 234         platform_driver_unregister(&fsg_led_driver);
 235 }
 236
 237
 238 module_init(fsg_led_init);
 239 module_exit(fsg_led_exit);
 240
 241 MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
 242 MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
 243 MODULE_LICENSE("GPL");