[linux-2.6-block.git] / drivers / input / touchscreen / mk712.c

/*
 * 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, 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);
}

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 fail;
	}

	if (!(mk712_dev = input_allocate_device())) {
		printk(KERN_ERR "mk712: not enough memory\n");
		err = -ENOMEM;
		goto fail;
	}

	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(EV_KEY) | BIT(EV_ABS);
	mk712_dev->keybit[LONG(BTN_TOUCH)] = BIT(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 fail;
	}

	input_register_device(mk712_dev);
	return 0;

 fail:	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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ICS MK712 touchscreen controller driver
	3	*
	4	* Copyright (c) 1999-2002 Transmeta Corporation
	5	* Copyright (c) 2005 Rick Koch <n1gp@hotmail.com>
	6	* Copyright (c) 2005 Vojtech Pavlik <vojtech@suse.cz>
	7	*/
	8
	9	/*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License version 2 as published by
	12	* the Free Software Foundation.
	13	*/
	14
	15	/*
	16	* This driver supports the ICS MicroClock MK712 TouchScreen controller,
	17	* found in Gateway AOL Connected Touchpad computers.
	18	*
	19	* Documentation for ICS MK712 can be found at:
de1b963a	20	* http://www.icst.com/pdf/mk712.pdf
1da177e4 LT	21	*/
	22
	23	/*
	24	* 1999-12-18: original version, Daniel Quinlan
	25	* 1999-12-19: added anti-jitter code, report pen-up events, fixed mk712_poll
	26	* to use queue_empty, Nathan Laredo
	27	* 1999-12-20: improved random point rejection, Nathan Laredo
	28	* 2000-01-05: checked in new anti-jitter code, changed mouse protocol, fixed
	29	* queue code, added module options, other fixes, Daniel Quinlan
	30	* 2002-03-15: Clean up for kernel merge <alan@redhat.com>
	31	* Fixed multi open race, fixed memory checks, fixed resource
	32	* allocation, fixed close/powerdown bug, switched to new init
	33	* 2005-01-18: Ported to 2.6 from 2.4.28, Rick Koch
	34	* 2005-02-05: Rewritten for the input layer, Vojtech Pavlik
	35	*
	36	*/
	37
	38	#include <linux/module.h>
	39	#include <linux/moduleparam.h>
	40	#include <linux/kernel.h>
	41	#include <linux/init.h>
	42	#include <linux/errno.h>
	43	#include <linux/delay.h>
	44	#include <linux/ioport.h>
	45	#include <linux/interrupt.h>
	46	#include <linux/input.h>
	47	#include <asm/io.h>
	48
	49	MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
	50	MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
	51	MODULE_LICENSE("GPL");
	52
	53	static unsigned int mk712_io = 0x260; /* Also 0x200, 0x208, 0x300 */
	54	module_param_named(io, mk712_io, uint, 0);
	55	MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
	56
	57	static unsigned int mk712_irq = 10; /* Also 12, 14, 15 */
	58	module_param_named(irq, mk712_irq, uint, 0);
	59	MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
	60
	61	/* eight 8-bit registers */
	62	#define MK712_STATUS 0
	63	#define MK712_X 2
	64	#define MK712_Y 4
	65	#define MK712_CONTROL 6
	66	#define MK712_RATE 7
	67
	68	/* status */
	69	#define MK712_STATUS_TOUCH 0x10
	70	#define MK712_CONVERSION_COMPLETE 0x80
	71
	72	/* control */
	73	#define MK712_ENABLE_INT 0x01
	74	#define MK712_INT_ON_CONVERSION_COMPLETE 0x02
	75	#define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS 0x04
	76	#define MK712_ENABLE_PERIODIC_CONVERSIONS 0x10
	77	#define MK712_READ_ONE_POINT 0x20
	78	#define MK712_POWERUP 0x40
	79
eca1ed19	80	static struct input_dev *mk712_dev;
1da177e4 LT	81	static DEFINE_SPINLOCK(mk712_lock);
	82
	83	static irqreturn_t mk712_interrupt(int irq, void dev_id, struct pt_regs regs)
	84	{
	85	unsigned char status;
	86	static int debounce = 1;
	87	static unsigned short last_x;
	88	static unsigned short last_y;
	89
	90	spin_lock(&mk712_lock);
eca1ed19	91	input_regs(mk712_dev, regs);
1da177e4 LT	92
	93	status = inb(mk712_io + MK712_STATUS);
	94
	95	if (~status & MK712_CONVERSION_COMPLETE) {
	96	debounce = 1;
	97	goto end;
	98	}
	99
	100	if (~status & MK712_STATUS_TOUCH)
	101	{
	102	debounce = 1;
eca1ed19	103	input_report_key(mk712_dev, BTN_TOUCH, 0);
1da177e4 LT	104	goto end;
	105	}
	106
	107	if (debounce)
	108	{
	109	debounce = 0;
	110	goto end;
	111	}
	112
eca1ed19 DT	113	input_report_key(mk712_dev, BTN_TOUCH, 1);
	114	input_report_abs(mk712_dev, ABS_X, last_x);
	115	input_report_abs(mk712_dev, ABS_Y, last_y);
1da177e4 LT	116
	117	end:
	118
	119	last_x = inw(mk712_io + MK712_X) & 0x0fff;
	120	last_y = inw(mk712_io + MK712_Y) & 0x0fff;
eca1ed19	121	input_sync(mk712_dev);
1da177e4 LT	122	spin_unlock(&mk712_lock);
	123	return IRQ_HANDLED;
	124	}
	125
	126	static int mk712_open(struct input_dev *dev)
	127	{
	128	unsigned long flags;
	129
	130	spin_lock_irqsave(&mk712_lock, flags);
	131
af246041	132	outb(0, mk712_io + MK712_CONTROL); /* Reset */
1da177e4	133
af246041 DT	134	outb(MK712_ENABLE_INT \| MK712_INT_ON_CONVERSION_COMPLETE \|
	135	MK712_INT_ON_CHANGE_IN_TOUCH_STATUS \|
	136	MK712_ENABLE_PERIODIC_CONVERSIONS \|
	137	MK712_POWERUP, mk712_io + MK712_CONTROL);
1da177e4	138
af246041	139	outb(10, mk712_io + MK712_RATE); /* 187 points per second */
1da177e4 LT	140
	141	spin_unlock_irqrestore(&mk712_lock, flags);
	142
	143	return 0;
	144	}
	145
	146	static void mk712_close(struct input_dev *dev)
	147	{
	148	unsigned long flags;
	149
	150	spin_lock_irqsave(&mk712_lock, flags);
	151
af246041	152	outb(0, mk712_io + MK712_CONTROL);
1da177e4 LT	153
	154	spin_unlock_irqrestore(&mk712_lock, flags);
	155	}
	156
1da177e4 LT	157	int __init mk712_init(void)
1da177e4 LT	158	{
eca1ed19	159	int err;
1da177e4	160
eca1ed19	161	if (!request_region(mk712_io, 8, "mk712")) {
1da177e4 LT	162	printk(KERN_WARNING "mk712: unable to get IO region\n");
	163	return -ENODEV;
	164	}
	165
	166	outb(0, mk712_io + MK712_CONTROL);
	167
	168	if ((inw(mk712_io + MK712_X) & 0xf000) \|\| /* Sanity check */
	169	(inw(mk712_io + MK712_Y) & 0xf000) \|\|
	170	(inw(mk712_io + MK712_STATUS) & 0xf333)) {
	171	printk(KERN_WARNING "mk712: device not present\n");
eca1ed19 DT	172	err = -ENODEV;
eca1ed19 DT	173	goto fail;
1da177e4 LT	174	}
1da177e4 LT	175
eca1ed19 DT	176	if (!(mk712_dev = input_allocate_device())) {
	177	printk(KERN_ERR "mk712: not enough memory\n");
	178	err = -ENOMEM;
	179	goto fail;
1da177e4 LT	180	}
1da177e4 LT	181
eca1ed19 DT	182	mk712_dev->name = "ICS MicroClock MK712 TouchScreen";
	183	mk712_dev->phys = "isa0260/input0";
	184	mk712_dev->id.bustype = BUS_ISA;
	185	mk712_dev->id.vendor = 0x0005;
	186	mk712_dev->id.product = 0x0001;
	187	mk712_dev->id.version = 0x0100;
	188
	189	mk712_dev->open = mk712_open;
	190	mk712_dev->close = mk712_close;
1da177e4	191
eca1ed19 DT	192	mk712_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS);
	193	mk712_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
	194	input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);
	195	input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);
1da177e4	196
eca1ed19 DT	197	if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) {
	198	printk(KERN_WARNING "mk712: unable to get IRQ\n");
	199	err = -EBUSY;
	200	goto fail;
	201	}
	202
	203	input_register_device(mk712_dev);
1da177e4	204	return 0;
eca1ed19 DT	205
	206	fail: input_free_device(mk712_dev);
	207	release_region(mk712_io, 8);
	208	return err;
1da177e4 LT	209	}
	210
	211	static void __exit mk712_exit(void)
	212	{
eca1ed19 DT	213	input_unregister_device(mk712_dev);
eca1ed19 DT	214	free_irq(mk712_irq, mk712_dev);
1da177e4 LT	215	release_region(mk712_io, 8);
	216	}
	217
	218	module_init(mk712_init);
	219	module_exit(mk712_exit);