target/linux/au1000-2.6/files/drivers/leds/leds-mtx1.c

   1 /*
   2  * LED driver for MTX-1 boards
   3  *
   4  * Copyright 2007 Florian Fainelli <florian@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/leds.h>
  16 #include <linux/err.h>
  17 #include <asm/mach-au1x00/au1000.h>
  18
  19 static struct platform_device *pdev;
  20
  21 static void mtx1_green_led_set(struct led_classdev *led_cdev, enum led_brightness brightness)
  22 {
  23         /* The power LED cannot be controlled the same way as for the Status LED */
  24         if (brightness) {
  25                 au_writel( 0x18000800, GPIO2_OUTPUT );
  26         } else {
  27                 au_writel( 0x18000000, GPIO2_OUTPUT);
  28         }
  29 }
  30
  31 static void mtx1_red_led_set(struct led_classdev *led_cdev, enum led_brightness brightness)
  32 {
  33         /* We store GPIO address (originally address - 200) in the "flags" field*/
  34         unsigned long pinmask = 1 << led_cdev->flags;
  35         if (brightness) {
  36                 au_writel((pinmask << 16) | pinmask, GPIO2_OUTPUT);
  37         } else {
  38                 au_writel((pinmask << 16) | 0, GPIO2_OUTPUT);
  39         }
  40 }
  41
  42 static struct led_classdev mtx1_green_led = {
  43         .name = "mtx1:green",
  44         .brightness_set = mtx1_green_led_set,
  45 };
  46
  47 static struct led_classdev mtx1_red_led = {
  48         .name = "mtx1:red",
  49         .flags = 12,
  50         .brightness_set = mtx1_red_led_set,
  51         .default_trigger = "ide-disk",
  52 };
  53
  54 static int mtx1_leds_probe(struct platform_device *pdev)
  55 {
  56         int ret;
  57
  58         ret = led_classdev_register(&pdev->dev, &mtx1_green_led);
  59         if (ret < 0)
  60                 goto out;
  61
  62         ret = led_classdev_register(&pdev->dev, &mtx1_red_led);
  63         if (ret < 0)
  64                 led_classdev_unregister(&mtx1_green_led);
  65
  66 out:
  67         return ret;
  68 }
  69
  70 static int mtx1_leds_remove(struct platform_device *pdev)
  71 {
  72         led_classdev_unregister(&mtx1_green_led);
  73         led_classdev_unregister(&mtx1_red_led);
  74         return 0;
  75 }
  76
  77 static struct platform_driver mtx1_leds_driver = {
  78         .probe = mtx1_leds_probe,
  79         .remove = mtx1_leds_remove,
  80         .driver = {
  81                 .name = "mtx1-leds",
  82         }
  83 };
  84
  85 static int __init mtx1_leds_init(void)
  86 {
  87         int ret;
  88
  89         ret = platform_driver_register(&mtx1_leds_driver);
  90         if (ret < 0)
  91                 goto out;
  92
  93         pdev = platform_device_register_simple("mtx1-leds", -1, NULL, 0);
  94         if (IS_ERR(pdev)) {
  95                 ret = PTR_ERR(pdev);
  96                 platform_driver_unregister(&mtx1_leds_driver);
  97                 goto out;
  98         }
  99
 100 out:
 101         return ret;
 102
 103 }
 104
 105 static void __exit mtx1_leds_exit(void)
 106 {
 107         platform_device_unregister(pdev);
 108         platform_driver_unregister(&mtx1_leds_driver);
 109 }
 110
 111 module_init(mtx1_leds_init);
 112 module_exit(mtx1_leds_exit);
 113
 114 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 115 MODULE_DESCRIPTION("MTX-1 LED driver");
 116 MODULE_LICENSE("GPL");