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 <linux/module.h>
  23 #include <linux/io.h>
  24 #include <mach/hardware.h>
  25
  26 #define FSG_LED_WLAN_BIT        0
  27 #define FSG_LED_WAN_BIT         1
  28 #define FSG_LED_SATA_BIT        2
  29 #define FSG_LED_USB_BIT         4
  30 #define FSG_LED_RING_BIT        5
  31 #define FSG_LED_SYNC_BIT        7
  32
  33 static short __iomem *latch_address;
  34 static unsigned short latch_value;
  35
  36
  37 static void fsg_led_wlan_set(struct led_classdev *led_cdev,
  38                              enum led_brightness value)
  39 {
  40         if (value) {
  41                 latch_value &= ~(1 << FSG_LED_WLAN_BIT);
  42                 *latch_address = latch_value;
  43         } else {
  44                 latch_value |=  (1 << FSG_LED_WLAN_BIT);
  45                 *latch_address = latch_value;
  46         }
  47 }
  48
  49 static void fsg_led_wan_set(struct led_classdev *led_cdev,
  50                             enum led_brightness value)
  51 {
  52         if (value) {
  53                 latch_value &= ~(1 << FSG_LED_WAN_BIT);
  54                 *latch_address = latch_value;
  55         } else {
  56                 latch_value |=  (1 << FSG_LED_WAN_BIT);
  57                 *latch_address = latch_value;
  58         }
  59 }
  60
  61 static void fsg_led_sata_set(struct led_classdev *led_cdev,
  62                              enum led_brightness value)
  63 {
  64         if (value) {
  65                 latch_value &= ~(1 << FSG_LED_SATA_BIT);
  66                 *latch_address = latch_value;
  67         } else {
  68                 latch_value |=  (1 << FSG_LED_SATA_BIT);
  69                 *latch_address = latch_value;
  70         }
  71 }
  72
  73 static void fsg_led_usb_set(struct led_classdev *led_cdev,
  74                             enum led_brightness value)
  75 {
  76         if (value) {
  77                 latch_value &= ~(1 << FSG_LED_USB_BIT);
  78                 *latch_address = latch_value;
  79         } else {
  80                 latch_value |=  (1 << FSG_LED_USB_BIT);
  81                 *latch_address = latch_value;
  82         }
  83 }
  84
  85 static void fsg_led_sync_set(struct led_classdev *led_cdev,
  86                              enum led_brightness value)
  87 {
  88         if (value) {
  89                 latch_value &= ~(1 << FSG_LED_SYNC_BIT);
  90                 *latch_address = latch_value;
  91         } else {
  92                 latch_value |=  (1 << FSG_LED_SYNC_BIT);
  93                 *latch_address = latch_value;
  94         }
  95 }
  96
  97 static void fsg_led_ring_set(struct led_classdev *led_cdev,
  98                              enum led_brightness value)
  99 {
 100         if (value) {
 101                 latch_value &= ~(1 << FSG_LED_RING_BIT);
 102                 *latch_address = latch_value;
 103         } else {
 104                 latch_value |=  (1 << FSG_LED_RING_BIT);
 105                 *latch_address = latch_value;
 106         }
 107 }
 108
 109
 110 static struct led_classdev fsg_wlan_led = {
 111         .name                   = "fsg:blue:wlan",
 112         .brightness_set         = fsg_led_wlan_set,
 113         .flags                  = LED_CORE_SUSPENDRESUME,
 114 };
 115
 116 static struct led_classdev fsg_wan_led = {
 117         .name                   = "fsg:blue:wan",
 118         .brightness_set         = fsg_led_wan_set,
 119         .flags                  = LED_CORE_SUSPENDRESUME,
 120 };
 121
 122 static struct led_classdev fsg_sata_led = {
 123         .name                   = "fsg:blue:sata",
 124         .brightness_set         = fsg_led_sata_set,
 125         .flags                  = LED_CORE_SUSPENDRESUME,
 126 };
 127
 128 static struct led_classdev fsg_usb_led = {
 129         .name                   = "fsg:blue:usb",
 130         .brightness_set         = fsg_led_usb_set,
 131         .flags                  = LED_CORE_SUSPENDRESUME,
 132 };
 133
 134 static struct led_classdev fsg_sync_led = {
 135         .name                   = "fsg:blue:sync",
 136         .brightness_set         = fsg_led_sync_set,
 137         .flags                  = LED_CORE_SUSPENDRESUME,
 138 };
 139
 140 static struct led_classdev fsg_ring_led = {
 141         .name                   = "fsg:blue:ring",
 142         .brightness_set         = fsg_led_ring_set,
 143         .flags                  = LED_CORE_SUSPENDRESUME,
 144 };
 145
 146
 147 static int fsg_led_probe(struct platform_device *pdev)
 148 {
 149         int ret;
 150
 151         /* Map the LED chip select address space */
 152         latch_address = (unsigned short *) devm_ioremap(&pdev->dev,
 153                                                 IXP4XX_EXP_BUS_BASE(2), 512);
 154         if (!latch_address)
 155                 return -ENOMEM;
 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
 198         return ret;
 199 }
 200
 201 static int fsg_led_remove(struct platform_device *pdev)
 202 {
 203         led_classdev_unregister(&fsg_wlan_led);
 204         led_classdev_unregister(&fsg_wan_led);
 205         led_classdev_unregister(&fsg_sata_led);
 206         led_classdev_unregister(&fsg_usb_led);
 207         led_classdev_unregister(&fsg_sync_led);
 208         led_classdev_unregister(&fsg_ring_led);
 209
 210         return 0;
 211 }
 212
 213
 214 static struct platform_driver fsg_led_driver = {
 215         .probe          = fsg_led_probe,
 216         .remove         = fsg_led_remove,
 217         .driver         = {
 218                 .name           = "fsg-led",
 219         },
 220 };
 221
 222 module_platform_driver(fsg_led_driver);
 223
 224 MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
 225 MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
 226 MODULE_LICENSE("GPL");