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Linux/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/platform_device.h>
 20 #include <linux/leds.h>
 21 #include <linux/module.h>
 22 #include <linux/io.h>
 23 #include <mach/hardware.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 *) devm_ioremap(&pdev->dev,
152                                                 IXP4XX_EXP_BUS_BASE(2), 512);
153         if (!latch_address)
154                 return -ENOMEM;
155 
156         latch_value = 0xffff;
157         *latch_address = latch_value;
158 
159         ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
160         if (ret < 0)
161                 goto failwlan;
162 
163         ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
164         if (ret < 0)
165                 goto failwan;
166 
167         ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
168         if (ret < 0)
169                 goto failsata;
170 
171         ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
172         if (ret < 0)
173                 goto failusb;
174 
175         ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
176         if (ret < 0)
177                 goto failsync;
178 
179         ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
180         if (ret < 0)
181                 goto failring;
182 
183         return ret;
184 
185  failring:
186         led_classdev_unregister(&fsg_sync_led);
187  failsync:
188         led_classdev_unregister(&fsg_usb_led);
189  failusb:
190         led_classdev_unregister(&fsg_sata_led);
191  failsata:
192         led_classdev_unregister(&fsg_wan_led);
193  failwan:
194         led_classdev_unregister(&fsg_wlan_led);
195  failwlan:
196 
197         return ret;
198 }
199 
200 static int fsg_led_remove(struct platform_device *pdev)
201 {
202         led_classdev_unregister(&fsg_wlan_led);
203         led_classdev_unregister(&fsg_wan_led);
204         led_classdev_unregister(&fsg_sata_led);
205         led_classdev_unregister(&fsg_usb_led);
206         led_classdev_unregister(&fsg_sync_led);
207         led_classdev_unregister(&fsg_ring_led);
208 
209         return 0;
210 }
211 
212 
213 static struct platform_driver fsg_led_driver = {
214         .probe          = fsg_led_probe,
215         .remove         = fsg_led_remove,
216         .driver         = {
217                 .name           = "fsg-led",
218         },
219 };
220 
221 module_platform_driver(fsg_led_driver);
222 
223 MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
224 MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
225 MODULE_LICENSE("GPL");
226 

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