geos.c

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/*
 * System Specific setup for Traverse Technologies GEOS.
 * At the moment this means setup of GPIO control of LEDs.
 *
 * Copyright (C) 2008 Constantin Baranov <[email protected]>
 * Copyright (C) 2011 Ed Wildgoose <[email protected]>
 *                and Philip Prindeville <[email protected]>
 *
 * TODO: There are large similarities with leds-net5501.c
 * by Alessandro Zummo <[email protected]>
 * In the future leds-net5501.c should be migrated over to platform
 *
 * 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 <linux/dmi.h>

#include <asm/geode.h>

static struct gpio_keys_button geos_gpio_buttons[] = {
    {
        .code = KEY_RESTART,
        .gpio = 3,
        .active_low = 1,
        .desc = "Reset button",
        .type = EV_KEY,
        .wakeup = 0,
        .debounce_interval = 100,
        .can_disable = 0,
    }
};
static struct gpio_keys_platform_data geos_buttons_data = {
    .buttons = geos_gpio_buttons,
    .nbuttons = ARRAY_SIZE(geos_gpio_buttons),
    .poll_interval = 20,
};

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

static struct gpio_led geos_leds[] = {
    {
        .name = "geos:1",
        .gpio = 6,
        .default_trigger = "default-on",
        .active_low = 1,
    },
    {
        .name = "geos:2",
        .gpio = 25,
        .default_trigger = "default-off",
        .active_low = 1,
    },
    {
        .name = "geos:3",
        .gpio = 27,
        .default_trigger = "default-off",
        .active_low = 1,
    },
};

static struct gpio_led_platform_data geos_leds_data = {
    .num_leds = ARRAY_SIZE(geos_leds),
    .leds = geos_leds,
};

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

static struct __initdata platform_device *geos_devs[] = {
    &geos_buttons_dev,
    &geos_leds_dev,
};

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

static int __init geos_init(void)
{
    const char *vendor, *product;

    if (!is_geode())
        return 0;

    vendor = dmi_get_system_info(DMI_SYS_VENDOR);
    if (!vendor || strcmp(vendor, "Traverse Technologies"))
        return 0;

    product = dmi_get_system_info(DMI_PRODUCT_NAME);
    if (!product || strcmp(product, "Geos"))
        return 0;

    printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
           KBUILD_MODNAME, vendor, product);

    register_geos();

    return 0;
}

module_init(geos_init);

MODULE_AUTHOR("Philip Prindeville <[email protected]>");
MODULE_DESCRIPTION("Traverse Technologies Geos System Setup");
MODULE_LICENSE("GPL");