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 #include <linux/module.h>
  20
  21 #include <asm/geode.h>
  22
  23 static const struct gpio_led net5501_leds[] = {
  24         {
  25                 .name = "error",
  26                 .gpio = 6,
  27                 .default_trigger = "default-on",
  28         },
  29 };
  30
  31 static struct gpio_led_platform_data net5501_leds_data = {
  32         .num_leds = ARRAY_SIZE(net5501_leds),
  33         .leds = net5501_leds,
  34 };
  35
  36 static struct platform_device net5501_leds_dev = {
  37         .name = "leds-gpio",
  38         .id = -1,
  39         .dev.platform_data = &net5501_leds_data,
  40 };
  41
  42 static void __init init_net5501(void)
  43 {
  44         platform_device_register(&net5501_leds_dev);
  45 }
  46
  47 struct soekris_board {
  48         u16     offset;
  49         char    *sig;
  50         u8      len;
  51         void    (*init)(void);
  52 };
  53
  54 static struct soekris_board __initdata boards[] = {
  55         { 0xb7b, "net5501", 7, init_net5501 },  /* net5501 v1.33/1.33c */
  56         { 0xb1f, "net5501", 7, init_net5501 },  /* net5501 v1.32i */
  57 };
  58
  59 static int __init soekris_init(void)
  60 {
  61         int i;
  62         unsigned char *rombase, *bios;
  63
  64         if (!is_geode())
  65                 return 0;
  66
  67         rombase = ioremap(0xffff0000, 0xffff);
  68         if (!rombase) {
  69                 printk(KERN_INFO "Soekris net5501 LED driver failed to get rombase");
  70                 return 0;
  71         }
  72
  73         bios = rombase + 0x20;  /* null terminated */
  74
  75         if (strncmp(bios, "comBIOS", 7))
  76                 goto unmap;
  77
  78         for (i = 0; i < ARRAY_SIZE(boards); i++) {
  79                 unsigned char *model = rombase + boards[i].offset;
  80
  81                 if (strncmp(model, boards[i].sig, boards[i].len) == 0) {
  82                         printk(KERN_INFO "Soekris %s: %s\n", model, bios);
  83
  84                         if (boards[i].init)
  85                                 boards[i].init();
  86                         break;
  87                 }
  88         }
  89
  90 unmap:
  91         iounmap(rombase);
  92         return 0;
  93 }
  94
  95 arch_initcall(soekris_init);
  96
  97 MODULE_LICENSE("GPL");