drivers/leds/leds-net5501.c

   1 /*
   2  * Soekris board support code
   3  *
   4  * Copyright (C) 2008-2009 Tower Technologies
   5  * Written by Alessandro Zummo <a.zummo@towertech.it>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/string.h>
  16 #include <linux/leds.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/gpio.h>
  19
  20 #include <asm/geode.h>
  21
  22 static struct gpio_led net5501_leds[] = {
  23         {
  24                 .name = "error",
  25                 .gpio = 6,
  26                 .default_trigger = "default-on",
  27         },
  28 };
  29
  30 static struct gpio_led_platform_data net5501_leds_data = {
  31         .num_leds = ARRAY_SIZE(net5501_leds),
  32         .leds = net5501_leds,
  33 };
  34
  35 static struct platform_device net5501_leds_dev = {
  36         .name = "leds-gpio",
  37         .id = -1,
  38         .dev.platform_data = &net5501_leds_data,
  39 };
  40
  41 static void __init init_net5501(void)
  42 {
  43         platform_device_register(&net5501_leds_dev);
  44 }
  45
  46 struct soekris_board {
  47         u16     offset;
  48         char    *sig;
  49         u8      len;
  50         void    (*init)(void);
  51 };
  52
  53 static struct soekris_board __initdata boards[] = {
  54         { 0xb7b, "net5501", 7, init_net5501 },  /* net5501 v1.33/1.33c */
  55         { 0xb1f, "net5501", 7, init_net5501 },  /* net5501 v1.32i */
  56 };
  57
  58 static int __init soekris_init(void)
  59 {
  60         int i;
  61         unsigned char *rombase, *bios;
  62
  63         if (!is_geode())
  64                 return 0;
  65
  66         rombase = ioremap(0xffff0000, 0xffff);
  67         if (!rombase) {
  68                 printk(KERN_INFO "Soekris net5501 LED driver failed to get rombase");
  69                 return 0;
  70         }
  71
  72         bios = rombase + 0x20;  /* null terminated */
  73
  74         if (strncmp(bios, "comBIOS", 7))
  75                 goto unmap;
  76
  77         for (i = 0; i < ARRAY_SIZE(boards); i++) {
  78                 unsigned char *model = rombase + boards[i].offset;
  79
  80                 if (strncmp(model, boards[i].sig, boards[i].len) == 0) {
  81                         printk(KERN_INFO "Soekris %s: %s\n", model, bios);
  82
  83                         if (boards[i].init)
  84                                 boards[i].init();
  85                         break;
  86                 }
  87         }
  88
  89 unmap:
  90         iounmap(rombase);
  91         return 0;
  92 }
  93
  94 arch_initcall(soekris_init);