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 <asm/arch/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
 103 static struct led_classdev fsg_wlan_led = {
 104         .name                   = "fsg:blue:wlan",
 105         .brightness_set         = fsg_led_wlan_set,
 106 };
 107
 108 static struct led_classdev fsg_wan_led = {
 109         .name                   = "fsg:blue:wan",
 110         .brightness_set         = fsg_led_wan_set,
 111 };
 112
 113 static struct led_classdev fsg_sata_led = {
 114         .name                   = "fsg:blue:sata",
 115         .brightness_set         = fsg_led_sata_set,
 116 };
 117
 118 static struct led_classdev fsg_usb_led = {
 119         .name                   = "fsg:blue:usb",
 120         .brightness_set         = fsg_led_usb_set,
 121 };
 122
 123 static struct led_classdev fsg_sync_led = {
 124         .name                   = "fsg:blue:sync",
 125         .brightness_set         = fsg_led_sync_set,
 126 };
 127
 128 static struct led_classdev fsg_ring_led = {
 129         .name                   = "fsg:blue:ring",
 130         .brightness_set         = fsg_led_ring_set,
 131 };
 132
 133
 134
 135 #ifdef CONFIG_PM
 136 static int fsg_led_suspend(struct platform_device *dev, pm_message_t state)
 137 {
 138         led_classdev_suspend(&fsg_wlan_led);
 139         led_classdev_suspend(&fsg_wan_led);
 140         led_classdev_suspend(&fsg_sata_led);
 141         led_classdev_suspend(&fsg_usb_led);
 142         led_classdev_suspend(&fsg_sync_led);
 143         led_classdev_suspend(&fsg_ring_led);
 144         return 0;
 145 }
 146
 147 static int fsg_led_resume(struct platform_device *dev)
 148 {
 149         led_classdev_resume(&fsg_wlan_led);
 150         led_classdev_resume(&fsg_wan_led);
 151         led_classdev_resume(&fsg_sata_led);
 152         led_classdev_resume(&fsg_usb_led);
 153         led_classdev_resume(&fsg_sync_led);
 154         led_classdev_resume(&fsg_ring_led);
 155         return 0;
 156 }
 157 #endif
 158
 159
 160 static int fsg_led_probe(struct platform_device *pdev)
 161 {
 162         int ret;
 163
 164         ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
 165         if (ret < 0)
 166                 goto failwlan;
 167
 168         ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
 169         if (ret < 0)
 170                 goto failwan;
 171
 172         ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
 173         if (ret < 0)
 174                 goto failsata;
 175
 176         ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
 177         if (ret < 0)
 178                 goto failusb;
 179
 180         ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
 181         if (ret < 0)
 182                 goto failsync;
 183
 184         ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
 185         if (ret < 0)
 186                 goto failring;
 187
 188         /* Map the LED chip select address space */
 189         latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
 190         if (!latch_address) {
 191                 ret = -ENOMEM;
 192                 goto failremap;
 193         }
 194
 195         latch_value = 0xffff;
 196         *latch_address = latch_value;
 197
 198         return ret;
 199
 200  failremap:
 201         led_classdev_unregister(&fsg_ring_led);
 202  failring:
 203         led_classdev_unregister(&fsg_sync_led);
 204  failsync:
 205         led_classdev_unregister(&fsg_usb_led);
 206  failusb:
 207         led_classdev_unregister(&fsg_sata_led);
 208  failsata:
 209         led_classdev_unregister(&fsg_wan_led);
 210  failwan:
 211         led_classdev_unregister(&fsg_wlan_led);
 212  failwlan:
 213
 214         return ret;
 215 }
 216
 217 static int fsg_led_remove(struct platform_device *pdev)
 218 {
 219         iounmap(latch_address);
 220
 221         led_classdev_unregister(&fsg_wlan_led);
 222         led_classdev_unregister(&fsg_wan_led);
 223         led_classdev_unregister(&fsg_sata_led);
 224         led_classdev_unregister(&fsg_usb_led);
 225         led_classdev_unregister(&fsg_sync_led);
 226         led_classdev_unregister(&fsg_ring_led);
 227
 228         return 0;
 229 }
 230
 231
 232 static struct platform_driver fsg_led_driver = {
 233         .probe          = fsg_led_probe,
 234         .remove         = fsg_led_remove,
 235 #ifdef CONFIG_PM
 236         .suspend        = fsg_led_suspend,
 237         .resume         = fsg_led_resume,
 238 #endif
 239         .driver         = {
 240                 .name           = "fsg-led",
 241         },
 242 };
 243
 244
 245 static int __init fsg_led_init(void)
 246 {
 247         return platform_driver_register(&fsg_led_driver);
 248 }
 249
 250 static void __exit fsg_led_exit(void)
 251 {
 252         platform_driver_unregister(&fsg_led_driver);
 253 }
 254
 255
 256 module_init(fsg_led_init);
 257 module_exit(fsg_led_exit);
 258
 259 MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
 260 MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
 261 MODULE_LICENSE("GPL");