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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 int mk712_used = 0;
static 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);
if (!mk712_used++) {
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);
if (!--mk712_used)
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);
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