summaryrefslogtreecommitdiff
path: root/drivers/input/touchscreen/mk712.c
blob: 4844d250a5ebc78ca09de77248d39156b08e0616 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/*
 * 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);