LXR linux/arch/x86/platform/geode/net5501.c

   1/*
   2 * System Specific setup for Soekris net5501
   3 * At the moment this means setup of GPIO control of LEDs and buttons
   4 * on net5501 boards.
   5 *
   6 *
   7 * Copyright (C) 2008-2009 Tower Technologies
   8 * Written by Alessandro Zummo <a.zummo@towertech.it>
   9 *
  10 * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
  11 * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
  12 *                and Philip Prindeville <philipp@redfish-solutions.com>
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License version 2
  16 * as published by the Free Software Foundation.
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/init.h>
  21#include <linux/io.h>
  22#include <linux/string.h>
  23#include <linux/module.h>
  24#include <linux/leds.h>
  25#include <linux/platform_device.h>
  26#include <linux/gpio.h>
  27#include <linux/input.h>
  28#include <linux/gpio_keys.h>
  29
  30#include <asm/geode.h>
  31
  32#define BIOS_REGION_BASE                0xffff0000
  33#define BIOS_REGION_SIZE                0x00010000
  34
  35static struct gpio_keys_button net5501_gpio_buttons[] = {
  36        {
  37                .code = KEY_RESTART,
  38                .gpio = 24,
  39                .active_low = 1,
  40                .desc = "Reset button",
  41                .type = EV_KEY,
  42                .wakeup = 0,
  43                .debounce_interval = 100,
  44                .can_disable = 0,
  45        }
  46};
  47static struct gpio_keys_platform_data net5501_buttons_data = {
  48        .buttons = net5501_gpio_buttons,
  49        .nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
  50        .poll_interval = 20,
  51};
  52
  53static struct platform_device net5501_buttons_dev = {
  54        .name = "gpio-keys-polled",
  55        .id = 1,
  56        .dev = {
  57                .platform_data = &net5501_buttons_data,
  58        }
  59};
  60
  61static struct gpio_led net5501_leds[] = {
  62        {
  63                .name = "net5501:1",
  64                .gpio = 6,
  65                .default_trigger = "default-on",
  66                .active_low = 0,
  67        },
  68};
  69
  70static struct gpio_led_platform_data net5501_leds_data = {
  71        .num_leds = ARRAY_SIZE(net5501_leds),
  72        .leds = net5501_leds,
  73};
  74
  75static struct platform_device net5501_leds_dev = {
  76        .name = "leds-gpio",
  77        .id = -1,
  78        .dev.platform_data = &net5501_leds_data,
  79};
  80
  81static struct __initdata platform_device *net5501_devs[] = {
  82        &net5501_buttons_dev,
  83        &net5501_leds_dev,
  84};
  85
  86static void __init register_net5501(void)
  87{
  88        /* Setup LED control through leds-gpio driver */
  89        platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
  90}
  91
  92struct net5501_board {
  93        u16     offset;
  94        u16     len;
  95        char    *sig;
  96};
  97
  98static struct net5501_board __initdata boards[] = {
  99        { 0xb7b, 7, "net5501" },        /* net5501 v1.33/1.33c */
 100        { 0xb1f, 7, "net5501" },        /* net5501 v1.32i */
 101};
 102
 103static bool __init net5501_present(void)
 104{
 105        int i;
 106        unsigned char *rombase, *bios;
 107        bool found = false;
 108
 109        rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
 110        if (!rombase) {
 111                printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
 112                return found;
 113        }
 114
 115        bios = rombase + 0x20;  /* null terminated */
 116
 117        if (memcmp(bios, "comBIOS", 7))
 118                goto unmap;
 119
 120        for (i = 0; i < ARRAY_SIZE(boards); i++) {
 121                unsigned char *model = rombase + boards[i].offset;
 122
 123                if (!memcmp(model, boards[i].sig, boards[i].len)) {
 124                        printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
 125                               KBUILD_MODNAME, model);
 126
 127                        found = true;
 128                        break;
 129                }
 130        }
 131
 132unmap:
 133        iounmap(rombase);
 134        return found;
 135}
 136
 137static int __init net5501_init(void)
 138{
 139        if (!is_geode())
 140                return 0;
 141
 142        if (!net5501_present())
 143                return 0;
 144
 145        register_net5501();
 146
 147        return 0;
 148}
 149
 150module_init(net5501_init);
 151
 152MODULE_AUTHOR("Philip Prindeville <philipp@redfish-solutions.com>");
 153MODULE_DESCRIPTION("Soekris net5501 System Setup");
 154MODULE_LICENSE("GPL");
 155