[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/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);
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>
1da177e4 LT	39	#include <linux/kernel.h>
	40	#include <linux/init.h>
	41	#include <linux/errno.h>
	42	#include <linux/delay.h>
	43	#include <linux/ioport.h>
	44	#include <linux/interrupt.h>
	45	#include <linux/input.h>
	46	#include <asm/io.h>
	47
	48	MODULE_AUTHOR("Daniel Quinlan <quinlan@pathname.com>, Vojtech Pavlik <vojtech@suse.cz>");
	49	MODULE_DESCRIPTION("ICS MicroClock MK712 TouchScreen driver");
	50	MODULE_LICENSE("GPL");
	51
	52	static unsigned int mk712_io = 0x260; /* Also 0x200, 0x208, 0x300 */
	53	module_param_named(io, mk712_io, uint, 0);
	54	MODULE_PARM_DESC(io, "I/O base address of MK712 touchscreen controller");
	55
	56	static unsigned int mk712_irq = 10; /* Also 12, 14, 15 */
	57	module_param_named(irq, mk712_irq, uint, 0);
	58	MODULE_PARM_DESC(irq, "IRQ of MK712 touchscreen controller");
	59
	60	/* eight 8-bit registers */
	61	#define MK712_STATUS 0
	62	#define MK712_X 2
	63	#define MK712_Y 4
	64	#define MK712_CONTROL 6
	65	#define MK712_RATE 7
	66
	67	/* status */
	68	#define MK712_STATUS_TOUCH 0x10
	69	#define MK712_CONVERSION_COMPLETE 0x80
	70
	71	/* control */
	72	#define MK712_ENABLE_INT 0x01
	73	#define MK712_INT_ON_CONVERSION_COMPLETE 0x02
	74	#define MK712_INT_ON_CHANGE_IN_TOUCH_STATUS 0x04
	75	#define MK712_ENABLE_PERIODIC_CONVERSIONS 0x10
	76	#define MK712_READ_ONE_POINT 0x20
	77	#define MK712_POWERUP 0x40
	78
eca1ed19	79	static struct input_dev *mk712_dev;
1da177e4 LT	80	static DEFINE_SPINLOCK(mk712_lock);
1da177e4 LT	81
7d12e780	82	static irqreturn_t mk712_interrupt(int irq, void *dev_id)
1da177e4 LT	83	{
	84	unsigned char status;
	85	static int debounce = 1;
	86	static unsigned short last_x;
	87	static unsigned short last_y;
	88
	89	spin_lock(&mk712_lock);
1da177e4 LT	90
	91	status = inb(mk712_io + MK712_STATUS);
	92
	93	if (~status & MK712_CONVERSION_COMPLETE) {
	94	debounce = 1;
	95	goto end;
	96	}
	97
52c1f570	98	if (~status & MK712_STATUS_TOUCH) {
1da177e4	99	debounce = 1;
eca1ed19	100	input_report_key(mk712_dev, BTN_TOUCH, 0);
1da177e4 LT	101	goto end;
	102	}
	103
52c1f570	104	if (debounce) {
1da177e4 LT	105	debounce = 0;
	106	goto end;
	107	}
	108
eca1ed19 DT	109	input_report_key(mk712_dev, BTN_TOUCH, 1);
	110	input_report_abs(mk712_dev, ABS_X, last_x);
	111	input_report_abs(mk712_dev, ABS_Y, last_y);
1da177e4	112
52c1f570	113	end:
1da177e4 LT	114	last_x = inw(mk712_io + MK712_X) & 0x0fff;
1da177e4 LT	115	last_y = inw(mk712_io + MK712_Y) & 0x0fff;
eca1ed19	116	input_sync(mk712_dev);
1da177e4 LT	117	spin_unlock(&mk712_lock);
	118	return IRQ_HANDLED;
	119	}
	120
	121	static int mk712_open(struct input_dev *dev)
	122	{
	123	unsigned long flags;
	124
	125	spin_lock_irqsave(&mk712_lock, flags);
	126
af246041	127	outb(0, mk712_io + MK712_CONTROL); /* Reset */
1da177e4	128
af246041 DT	129	outb(MK712_ENABLE_INT \| MK712_INT_ON_CONVERSION_COMPLETE \|
	130	MK712_INT_ON_CHANGE_IN_TOUCH_STATUS \|
	131	MK712_ENABLE_PERIODIC_CONVERSIONS \|
	132	MK712_POWERUP, mk712_io + MK712_CONTROL);
1da177e4	133
af246041	134	outb(10, mk712_io + MK712_RATE); /* 187 points per second */
1da177e4 LT	135
	136	spin_unlock_irqrestore(&mk712_lock, flags);
	137
	138	return 0;
	139	}
	140
	141	static void mk712_close(struct input_dev *dev)
	142	{
	143	unsigned long flags;
	144
	145	spin_lock_irqsave(&mk712_lock, flags);
	146
af246041	147	outb(0, mk712_io + MK712_CONTROL);
1da177e4 LT	148
	149	spin_unlock_irqrestore(&mk712_lock, flags);
	150	}
	151
ffc6b529	152	static int __init mk712_init(void)
1da177e4	153	{
eca1ed19	154	int err;
1da177e4	155
eca1ed19	156	if (!request_region(mk712_io, 8, "mk712")) {
1da177e4 LT	157	printk(KERN_WARNING "mk712: unable to get IO region\n");
	158	return -ENODEV;
	159	}
	160
	161	outb(0, mk712_io + MK712_CONTROL);
	162
	163	if ((inw(mk712_io + MK712_X) & 0xf000) \|\| /* Sanity check */
	164	(inw(mk712_io + MK712_Y) & 0xf000) \|\|
	165	(inw(mk712_io + MK712_STATUS) & 0xf333)) {
	166	printk(KERN_WARNING "mk712: device not present\n");
eca1ed19	167	err = -ENODEV;
52c1f570	168	goto fail1;
1da177e4 LT	169	}
1da177e4 LT	170
52c1f570 DT	171	mk712_dev = input_allocate_device();
52c1f570 DT	172	if (!mk712_dev) {
eca1ed19 DT	173	printk(KERN_ERR "mk712: not enough memory\n");
eca1ed19 DT	174	err = -ENOMEM;
52c1f570	175	goto fail1;
1da177e4 LT	176	}
1da177e4 LT	177
eca1ed19 DT	178	mk712_dev->name = "ICS MicroClock MK712 TouchScreen";
	179	mk712_dev->phys = "isa0260/input0";
	180	mk712_dev->id.bustype = BUS_ISA;
	181	mk712_dev->id.vendor = 0x0005;
	182	mk712_dev->id.product = 0x0001;
	183	mk712_dev->id.version = 0x0100;
	184
	185	mk712_dev->open = mk712_open;
	186	mk712_dev->close = mk712_close;
1da177e4	187
7b19ada2 JS	188	mk712_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
7b19ada2 JS	189	mk712_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
eca1ed19 DT	190	input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);
eca1ed19 DT	191	input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);
1da177e4	192
eca1ed19 DT	193	if (request_irq(mk712_irq, mk712_interrupt, 0, "mk712", mk712_dev)) {
	194	printk(KERN_WARNING "mk712: unable to get IRQ\n");
	195	err = -EBUSY;
52c1f570	196	goto fail1;
eca1ed19 DT	197	}
eca1ed19 DT	198
52c1f570 DT	199	err = input_register_device(mk712_dev);
	200	if (err)
	201	goto fail2;
	202
1da177e4	203	return 0;
eca1ed19	204
52c1f570 DT	205	fail2: free_irq(mk712_irq, mk712_dev);
52c1f570 DT	206	fail1: input_free_device(mk712_dev);
eca1ed19 DT	207	release_region(mk712_io, 8);
eca1ed19 DT	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);