drivers/leds/leds-fsg.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LED Driver for the Freecom FSG-3
   4  *
   5  * Copyright (c) 2008 Rod Whitby <rod@whitby.id.au>
   6  *
   7  * Author: Rod Whitby <rod@whitby.id.au>
   8  *
   9  * Based on leds-spitz.c
  10  * Copyright 2005-2006 Openedhand Ltd.
  11  * Author: Richard Purdie <rpurdie@openedhand.com>
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/leds.h>
  17 #include <linux/module.h>
  18 #include <linux/io.h>
  19 #include <mach/hardware.h>
  20
  21 #define FSG_LED_WLAN_BIT        0
  22 #define FSG_LED_WAN_BIT         1
  23 #define FSG_LED_SATA_BIT        2
  24 #define FSG_LED_USB_BIT         4
  25 #define FSG_LED_RING_BIT        5
  26 #define FSG_LED_SYNC_BIT        7
  27
  28 static short __iomem *latch_address;
  29 static unsigned short latch_value;
  30
  31
  32 static void fsg_led_wlan_set(struct led_classdev *led_cdev,
  33                              enum led_brightness value)
  34 {
  35         if (value) {
  36                 latch_value &= ~(1 << FSG_LED_WLAN_BIT);
  37                 *latch_address = latch_value;
  38         } else {
  39                 latch_value |=  (1 << FSG_LED_WLAN_BIT);
  40                 *latch_address = latch_value;
  41         }
  42 }
  43
  44 static void fsg_led_wan_set(struct led_classdev *led_cdev,
  45                             enum led_brightness value)
  46 {
  47         if (value) {
  48                 latch_value &= ~(1 << FSG_LED_WAN_BIT);
  49                 *latch_address = latch_value;
  50         } else {
  51                 latch_value |=  (1 << FSG_LED_WAN_BIT);
  52                 *latch_address = latch_value;
  53         }
  54 }
  55
  56 static void fsg_led_sata_set(struct led_classdev *led_cdev,
  57                              enum led_brightness value)
  58 {
  59         if (value) {
  60                 latch_value &= ~(1 << FSG_LED_SATA_BIT);
  61                 *latch_address = latch_value;
  62         } else {
  63                 latch_value |=  (1 << FSG_LED_SATA_BIT);
  64                 *latch_address = latch_value;
  65         }
  66 }
  67
  68 static void fsg_led_usb_set(struct led_classdev *led_cdev,
  69                             enum led_brightness value)
  70 {
  71         if (value) {
  72                 latch_value &= ~(1 << FSG_LED_USB_BIT);
  73                 *latch_address = latch_value;
  74         } else {
  75                 latch_value |=  (1 << FSG_LED_USB_BIT);
  76                 *latch_address = latch_value;
  77         }
  78 }
  79
  80 static void fsg_led_sync_set(struct led_classdev *led_cdev,
  81                              enum led_brightness value)
  82 {
  83         if (value) {
  84                 latch_value &= ~(1 << FSG_LED_SYNC_BIT);
  85                 *latch_address = latch_value;
  86         } else {
  87                 latch_value |=  (1 << FSG_LED_SYNC_BIT);
  88                 *latch_address = latch_value;
  89         }
  90 }
  91
  92 static void fsg_led_ring_set(struct led_classdev *led_cdev,
  93                              enum led_brightness value)
  94 {
  95         if (value) {
  96                 latch_value &= ~(1 << FSG_LED_RING_BIT);
  97                 *latch_address = latch_value;
  98         } else {
  99                 latch_value |=  (1 << FSG_LED_RING_BIT);
 100                 *latch_address = latch_value;
 101         }
 102 }
 103
 104
 105 static struct led_classdev fsg_wlan_led = {
 106         .name                   = "fsg:blue:wlan",
 107         .brightness_set         = fsg_led_wlan_set,
 108         .flags                  = LED_CORE_SUSPENDRESUME,
 109 };
 110
 111 static struct led_classdev fsg_wan_led = {
 112         .name                   = "fsg:blue:wan",
 113         .brightness_set         = fsg_led_wan_set,
 114         .flags                  = LED_CORE_SUSPENDRESUME,
 115 };
 116
 117 static struct led_classdev fsg_sata_led = {
 118         .name                   = "fsg:blue:sata",
 119         .brightness_set         = fsg_led_sata_set,
 120         .flags                  = LED_CORE_SUSPENDRESUME,
 121 };
 122
 123 static struct led_classdev fsg_usb_led = {
 124         .name                   = "fsg:blue:usb",
 125         .brightness_set         = fsg_led_usb_set,
 126         .flags                  = LED_CORE_SUSPENDRESUME,
 127 };
 128
 129 static struct led_classdev fsg_sync_led = {
 130         .name                   = "fsg:blue:sync",
 131         .brightness_set         = fsg_led_sync_set,
 132         .flags                  = LED_CORE_SUSPENDRESUME,
 133 };
 134
 135 static struct led_classdev fsg_ring_led = {
 136         .name                   = "fsg:blue:ring",
 137         .brightness_set         = fsg_led_ring_set,
 138         .flags                  = LED_CORE_SUSPENDRESUME,
 139 };
 140
 141
 142 static int fsg_led_probe(struct platform_device *pdev)
 143 {
 144         int ret;
 145
 146         /* Map the LED chip select address space */
 147         latch_address = (unsigned short *) devm_ioremap(&pdev->dev,
 148                                                 IXP4XX_EXP_BUS_BASE(2), 512);
 149         if (!latch_address)
 150                 return -ENOMEM;
 151
 152         latch_value = 0xffff;
 153         *latch_address = latch_value;
 154
 155         ret = devm_led_classdev_register(&pdev->dev, &fsg_wlan_led);
 156         if (ret < 0)
 157                 return ret;
 158
 159         ret = devm_led_classdev_register(&pdev->dev, &fsg_wan_led);
 160         if (ret < 0)
 161                 return ret;
 162
 163         ret = devm_led_classdev_register(&pdev->dev, &fsg_sata_led);
 164         if (ret < 0)
 165                 return ret;
 166
 167         ret = devm_led_classdev_register(&pdev->dev, &fsg_usb_led);
 168         if (ret < 0)
 169                 return ret;
 170
 171         ret = devm_led_classdev_register(&pdev->dev, &fsg_sync_led);
 172         if (ret < 0)
 173                 return ret;
 174
 175         ret = devm_led_classdev_register(&pdev->dev, &fsg_ring_led);
 176         if (ret < 0)
 177                 return ret;
 178
 179         return ret;
 180 }
 181
 182 static struct platform_driver fsg_led_driver = {
 183         .probe          = fsg_led_probe,
 184         .driver         = {
 185                 .name           = "fsg-led",
 186         },
 187 };
 188
 189 module_platform_driver(fsg_led_driver);
 190
 191 MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
 192 MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
 193 MODULE_LICENSE("GPL");