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/*

 * ICS MK712 touchscreen controller driver

 *

 * Copyright (c) 1999-2002 Transmeta Corporation

 * Copyright (c) 2005 Rick Koch <n1gp@hotmail.com>

 * Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>

 */

/*

 * 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.

 */

/*

 * This driver supports the ICS MicroClock MK712 TouchScreen controller,

 * found in Gateway AOL Connected Touchpad computers.

 *

 * Documentation for ICS MK712 can be found at:

 *      http://www.icst.com/pdf/mk712.pdf

 */

/*

 * 1999-12-18: original version, Daniel Quinlan

 * 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll

 *             to use queue_empty, Nathan Laredo

 * 1999-12-20: improved random point rejection, Nathan Laredo

 * 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed

 *             queue code, added module options, other fixes, Daniel Quinlan

 * 2002-03-15: Clean up for kernel merge <alan@redhat.com>

 *             Fixed multi open race, fixed memory checks, fixed resource

 *             allocation, fixed close/powerdown bug, switched to new init

 * 2005-01-18: Ported to 2.6 from 2.4.28, Rick Koch

 * 2005-02-05: Rewritten for the input layer, Vojtech Pavlik

 *

 */

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/errno.h>

#include <linux/delay.h>

#include <linux/ioport.h>

#include <linux/interrupt.h>

#include <linux/input.h>

#include <asm/io.h>

MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");

MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");

MODULE_LICENSE("GPL");

static unsigned int mk712_io = 0x260;   /* Also 0x200, 0x208, 0x300 */

module_param_named(io, mk712_io, uint, 0);

MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");

static unsigned int mk712_irq = 10;     /* Also 12, 14, 15 */

module_param_named(irq, mk712_irq, uint, 0);

MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");

/* eight 8-bit registers */

#define MK712_STATUS            0

#define MK712_X                 2

#define MK712_Y                 4

#define MK712_CONTROL           6

#define MK712_RATE              7

/* status */

#define MK712_STATUS_TOUCH                      0x10

#define MK712_CONVERSION_COMPLETE               0x80

/* control */

#define MK712_ENABLE_INT                        0x01

#define MK712_INT_ON_CONVERSION_COMPLETE        0x02

#define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS     0x04

#define MK712_ENABLE_PERIODIC_CONVERSIONS       0x10

#define MK712_READ_ONE_POINT                    0x20

#define MK712_POWERUP                           0x40

static struct input_dev *mk712_dev;

static DEFINE_SPINLOCK(mk712_lock);

static irqreturn_t mk712_interrupt(int irq, void *dev_id)

{

        unsigned char status;

        static int debounce = 1;

        static unsigned short last_x;

        static unsigned short last_y;

        spin_lock(&mk712_lock);

        status = inb(mk712_io + MK712_STATUS);

        if (~status & MK712_CONVERSION_COMPLETE) {

                debounce = 1;

                goto end;

        }

        if (~status & MK712_STATUS_TOUCH) {

                debounce = 1;

                input_report_key(mk712_dev, BTN_TOUCH, 0);

                goto end;

        }

        if (debounce) {

                debounce = 0;

                goto end;

        }

        input_report_key(mk712_dev, BTN_TOUCH, 1);

        input_report_abs(mk712_dev, ABS_X, last_x);

        input_report_abs(mk712_dev, ABS_Y, last_y);

 end:

        last_x = inw(mk712_io + MK712_X) & 0x0fff;

        last_y = inw(mk712_io + MK712_Y) & 0x0fff;

        input_sync(mk712_dev);

        spin_unlock(&mk712_lock);

        return IRQ_HANDLED;

}

static int mk712_open(struct input_dev *dev)

{

        unsigned long flags;

        spin_lock_irqsave(&mk712_lock, flags);

        outb(0, mk712_io + MK712_CONTROL); /* Reset */

        outb(MK712_ENABLE_INT | MK712_INT_ON_CONVERSION_COMPLETE |

                MK712_INT_ON_CHANGE_IN_TOUCH_STATUS |

                MK712_ENABLE_PERIODIC_CONVERSIONS |

                MK712_POWERUP, mk712_io + MK712_CONTROL);

        outb(10, mk712_io + MK712_RATE); /* 187 points per second */

        spin_unlock_irqrestore(&mk712_lock, flags);

        return 0;

}

static void mk712_close(struct input_dev *dev)

{

        unsigned long flags;

        spin_lock_irqsave(&mk712_lock, flags);

        outb(0, mk712_io + MK712_CONTROL);

        spin_unlock_irqrestore(&mk712_lock, flags);

}

static int __init mk712_init(void)

{

        int err;

        if (!request_region(mk712_io, 8, "mk712")) {

                printk(KERN_WARNING "mk712: unable to get IO region\n");

                return -ENODEV;

        }

        outb(0, mk712_io + MK712_CONTROL);

        if ((inw(mk712_io + MK712_X) & 0xf000) ||       /* Sanity check */

            (inw(mk712_io + MK712_Y) & 0xf000) ||

            (inw(mk712_io + MK712_STATUS) & 0xf333)) {

                printk(KERN_WARNING "mk712: device not present\n");

                err = -ENODEV;

                goto fail1;

        }

        mk712_dev = input_allocate_device();

        if (!mk712_dev) {

                printk(KERN_ERR "mk712: not enough memory\n");

                err = -ENOMEM;

                goto fail1;

        }

        mk712_dev->name = "ICS MicroClock MK712 TouchScreen";

        mk712_dev->phys = "isa0260/input0";

        mk712_dev->id.bustype = BUS_ISA;

        mk712_dev->id.vendor  = 0x0005;

        mk712_dev->id.product = 0x0001;

        mk712_dev->id.version = 0x0100;

        mk712_dev->open    = mk712_open;

        mk712_dev->close   = mk712_close;

        mk712_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

        mk712_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

        input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);

        input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);

        if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) {

                printk(KERN_WARNING "mk712: unable to get IRQ\n");

                err = -EBUSY;

                goto fail1;

        }

        err = input_register_device(mk712_dev);

        if (err)

                goto fail2;

        return 0;

 fail2: free_irq(mk712_irq, mk712_dev);

 fail1: input_free_device(mk712_dev);

        release_region(mk712_io, 8);

        return err;

}

static void __exit mk712_exit(void)

{

        input_unregister_device(mk712_dev);

        free_irq(mk712_irq, mk712_dev);

        release_region(mk712_io, 8);

}

module_init(mk712_init);

module_exit(mk712_exit);