/* * 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				0x40static struct input_dev mk712_dev;static DEFINE_SPINLOCK(mk712_lock);static irqreturn_t mk712_interrupt(int irq, void *dev_id, struct pt_regs *regs){	unsigned char status;	static int debounce = 1;	static unsigned short last_x;	static unsigned short last_y;	spin_lock(&mk712_lock);	input_regs(&mk712_dev, regs);	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 struct input_dev mk712_dev = {	.evbit   = { BIT(EV_KEY) | BIT(EV_ABS) },	.keybit  = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },	.absbit  = { BIT(ABS_X) | BIT(ABS_Y) },	.open    = mk712_open,	.close   = mk712_close,	.name    = "ICS MicroClock MK712 TouchScreen",	.phys    = "isa0260/input0",	.absmin  = { [ABS_X] = 0, [ABS_Y] = 0 },	.absmax  = { [ABS_X] = 0xfff, [ABS_Y] = 0xfff },	.absfuzz = { [ABS_X] = 88, [ABS_Y] = 88 },	.id      = {		.bustype = BUS_ISA,		.vendor  = 0x0005,		.product = 0x0001,		.version = 0x0100,	},};int __init mk712_init(void){	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");		release_region(mk712_io, 8);		return -ENODEV;	}	if(request_irq(mk712_irq, mk712_interrupt, 0, "mk712", &mk712_dev))	{		printk(KERN_WARNING "mk712: unable to get IRQ\n");		release_region(mk712_io, 8);		return -EBUSY;	}	input_register_device(&mk712_dev);	printk(KERN_INFO "input: ICS MicroClock MK712 TouchScreen at %#x irq %d\n", mk712_io, mk712_irq);	return 0;}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);