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 static short __iomem *latch_address;
  26 static unsigned short latch_value;
  27
  28
  29 static void fsg_led_wlan_set(struct led_classdev *led_cdev,
  30                              enum led_brightness value)
  31 {
  32         if (value) {
  33                 latch_value &= ~(1 << FSG_LED_WLAN_BIT);
  34                 *latch_address = latch_value;
  35         } else {
  36                 latch_value |=  (1 << FSG_LED_WLAN_BIT);
  37                 *latch_address = latch_value;
  38         }
  39 }
  40
  41 static void fsg_led_wan_set(struct led_classdev *led_cdev,
  42                             enum led_brightness value)
  43 {
  44         if (value) {
  45                 latch_value &= ~(1 << FSG_LED_WAN_BIT);
  46                 *latch_address = latch_value;
  47         } else {
  48                 latch_value |=  (1 << FSG_LED_WAN_BIT);
  49                 *latch_address = latch_value;
  50         }
  51 }
  52
  53 static void fsg_led_sata_set(struct led_classdev *led_cdev,
  54                              enum led_brightness value)
  55 {
  56         if (value) {
  57                 latch_value &= ~(1 << FSG_LED_SATA_BIT);
  58                 *latch_address = latch_value;
  59         } else {
  60                 latch_value |=  (1 << FSG_LED_SATA_BIT);
  61                 *latch_address = latch_value;
  62         }
  63 }
  64
  65 static void fsg_led_usb_set(struct led_classdev *led_cdev,
  66                             enum led_brightness value)
  67 {
  68         if (value) {
  69                 latch_value &= ~(1 << FSG_LED_USB_BIT);
  70                 *latch_address = latch_value;
  71         } else {
  72                 latch_value |=  (1 << FSG_LED_USB_BIT);
  73                 *latch_address = latch_value;
  74         }
  75 }
  76
  77 static void fsg_led_sync_set(struct led_classdev *led_cdev,
  78                              enum led_brightness value)
  79 {
  80         if (value) {
  81                 latch_value &= ~(1 << FSG_LED_SYNC_BIT);
  82                 *latch_address = latch_value;
  83         } else {
  84                 latch_value |=  (1 << FSG_LED_SYNC_BIT);
  85                 *latch_address = latch_value;
  86         }
  87 }
  88
  89 static void fsg_led_ring_set(struct led_classdev *led_cdev,
  90                              enum led_brightness value)
  91 {
  92         if (value) {
  93                 latch_value &= ~(1 << FSG_LED_RING_BIT);
  94                 *latch_address = latch_value;
  95         } else {
  96                 latch_value |=  (1 << FSG_LED_RING_BIT);
  97                 *latch_address = latch_value;
  98         }
  99 }
 100
 101
 102 static struct led_classdev fsg_wlan_led = {
 103         .name                   = "fsg:blue:wlan",
 104         .brightness_set         = fsg_led_wlan_set,
 105         .flags                  = LED_CORE_SUSPENDRESUME,
 106 };
 107
 108 static struct led_classdev fsg_wan_led = {
 109         .name                   = "fsg:blue:wan",
 110         .brightness_set         = fsg_led_wan_set,
 111         .flags                  = LED_CORE_SUSPENDRESUME,
 112 };
 113
 114 static struct led_classdev fsg_sata_led = {
 115         .name                   = "fsg:blue:sata",
 116         .brightness_set         = fsg_led_sata_set,
 117         .flags                  = LED_CORE_SUSPENDRESUME,
 118 };
 119
 120 static struct led_classdev fsg_usb_led = {
 121         .name                   = "fsg:blue:usb",
 122         .brightness_set         = fsg_led_usb_set,
 123         .flags                  = LED_CORE_SUSPENDRESUME,
 124 };
 125
 126 static struct led_classdev fsg_sync_led = {
 127         .name                   = "fsg:blue:sync",
 128         .brightness_set         = fsg_led_sync_set,
 129         .flags                  = LED_CORE_SUSPENDRESUME,
 130 };
 131
 132 static struct led_classdev fsg_ring_led = {
 133         .name                   = "fsg:blue:ring",
 134         .brightness_set         = fsg_led_ring_set,
 135         .flags                  = LED_CORE_SUSPENDRESUME,
 136 };
 137
 138
 139 static int fsg_led_probe(struct platform_device *pdev)
 140 {
 141         int ret;
 142
 143         /* Map the LED chip select address space */
 144         latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
 145         if (!latch_address) {
 146                 ret = -ENOMEM;
 147                 goto failremap;
 148         }
 149
 150         latch_value = 0xffff;
 151         *latch_address = latch_value;
 152
 153         ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
 154         if (ret < 0)
 155                 goto failwlan;
 156
 157         ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
 158         if (ret < 0)
 159                 goto failwan;
 160
 161         ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
 162         if (ret < 0)
 163                 goto failsata;
 164
 165         ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
 166         if (ret < 0)
 167                 goto failusb;
 168
 169         ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
 170         if (ret < 0)
 171                 goto failsync;
 172
 173         ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
 174         if (ret < 0)
 175                 goto failring;
 176
 177         return ret;
 178
 179  failring:
 180         led_classdev_unregister(&fsg_sync_led);
 181  failsync:
 182         led_classdev_unregister(&fsg_usb_led);
 183  failusb:
 184         led_classdev_unregister(&fsg_sata_led);
 185  failsata:
 186         led_classdev_unregister(&fsg_wan_led);
 187  failwan:
 188         led_classdev_unregister(&fsg_wlan_led);
 189  failwlan:
 190         iounmap(latch_address);
 191  failremap:
 192
 193         return ret;
 194 }
 195
 196 static int fsg_led_remove(struct platform_device *pdev)
 197 {
 198         led_classdev_unregister(&fsg_wlan_led);
 199         led_classdev_unregister(&fsg_wan_led);
 200         led_classdev_unregister(&fsg_sata_led);
 201         led_classdev_unregister(&fsg_usb_led);
 202         led_classdev_unregister(&fsg_sync_led);
 203         led_classdev_unregister(&fsg_ring_led);
 204
 205         iounmap(latch_address);
 206
 207         return 0;
 208 }
 209
 210
 211 static struct platform_driver fsg_led_driver = {
 212         .probe          = fsg_led_probe,
 213         .remove         = fsg_led_remove,
 214         .driver         = {
 215                 .name           = "fsg-led",
 216         },
 217 };
 218
 219
 220 static int __init fsg_led_init(void)
 221 {
 222         return platform_driver_register(&fsg_led_driver);
 223 }
 224
 225 static void __exit fsg_led_exit(void)
 226 {
 227         platform_driver_unregister(&fsg_led_driver);
 228 }
 229
 230
 231 module_init(fsg_led_init);
 232 module_exit(fsg_led_exit);
 233
 234 MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
 235 MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
 236 MODULE_LICENSE("GPL");