net5501.c

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/*
 * System Specific setup for Soekris net5501
 * At the moment this means setup of GPIO control of LEDs and buttons
 * on net5501 boards.
 *
 *
 * Copyright (C) 2008-2009 Tower Technologies
 * Written by Alessandro Zummo <[email protected]>
 *
 * Copyright (C) 2008 Constantin Baranov <[email protected]>
 * Copyright (C) 2011 Ed Wildgoose <[email protected]>
 *                and Philip Prindeville <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/input.h>
#include <linux/gpio_keys.h>

#include <asm/geode.h>

#define BIOS_REGION_BASE        0xffff0000
#define BIOS_REGION_SIZE        0x00010000

static struct gpio_keys_button net5501_gpio_buttons[] = {
    {
        .code = KEY_RESTART,
        .gpio = 24,
        .active_low = 1,
        .desc = "Reset button",
        .type = EV_KEY,
        .wakeup = 0,
        .debounce_interval = 100,
        .can_disable = 0,
    }
};
static struct gpio_keys_platform_data net5501_buttons_data = {
    .buttons = net5501_gpio_buttons,
    .nbuttons = ARRAY_SIZE(net5501_gpio_buttons),
    .poll_interval = 20,
};

static struct platform_device net5501_buttons_dev = {
    .name = "gpio-keys-polled",
    .id = 1,
    .dev = {
        .platform_data = &net5501_buttons_data,
    }
};

static struct gpio_led net5501_leds[] = {
    {
        .name = "net5501:1",
        .gpio = 6,
        .default_trigger = "default-on",
        .active_low = 0,
    },
};

static struct gpio_led_platform_data net5501_leds_data = {
    .num_leds = ARRAY_SIZE(net5501_leds),
    .leds = net5501_leds,
};

static struct platform_device net5501_leds_dev = {
    .name = "leds-gpio",
    .id = -1,
    .dev.platform_data = &net5501_leds_data,
};

static struct __initdata platform_device *net5501_devs[] = {
    &net5501_buttons_dev,
    &net5501_leds_dev,
};

static void __init register_net5501(void)
{
    /* Setup LED control through leds-gpio driver */
    platform_add_devices(net5501_devs, ARRAY_SIZE(net5501_devs));
}

struct net5501_board {
    u16 offset;
    u16 len;
    char    *sig;
};

static struct net5501_board __initdata boards[] = {
    { 0xb7b, 7, "net5501" },    /* net5501 v1.33/1.33c */
    { 0xb1f, 7, "net5501" },    /* net5501 v1.32i */
};

static bool __init net5501_present(void)
{
    int i;
    unsigned char *rombase, *bios;
    bool found = false;

    rombase = ioremap(BIOS_REGION_BASE, BIOS_REGION_SIZE - 1);
    if (!rombase) {
        printk(KERN_ERR "%s: failed to get rombase\n", KBUILD_MODNAME);
        return found;
    }

    bios = rombase + 0x20;  /* null terminated */

    if (memcmp(bios, "comBIOS", 7))
        goto unmap;

    for (i = 0; i < ARRAY_SIZE(boards); i++) {
        unsigned char *model = rombase + boards[i].offset;

        if (!memcmp(model, boards[i].sig, boards[i].len)) {
            printk(KERN_INFO "%s: system is recognized as \"%s\"\n",
                   KBUILD_MODNAME, model);

            found = true;
            break;
        }
    }

unmap:
    iounmap(rombase);
    return found;
}

static int __init net5501_init(void)
{
    if (!is_geode())
        return 0;

    if (!net5501_present())
        return 0;

    register_net5501();

    return 0;
}

module_init(net5501_init);

MODULE_AUTHOR("Philip Prindeville <[email protected]>");
MODULE_DESCRIPTION("Soekris net5501 System Setup");
MODULE_LICENSE("GPL");