2 * ICS MK712 touchscreen controller driver
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>
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.
16 * This driver supports the ICS MicroClock MK712 TouchScreen controller,
17 * found in Gateway AOL Connected Touchpad computers.
19 * Documentation for ICS MK712 can be found at:
20 * http://www.icst.com/pdf/mk712.pdf
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
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>
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");
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");
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");
61 /* eight 8-bit registers */
62 #define MK712_STATUS 0
65 #define MK712_CONTROL 6
69 #define MK712_STATUS_TOUCH 0x10
70 #define MK712_CONVERSION_COMPLETE 0x80
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
80 static struct input_dev mk712_dev;
81 static DEFINE_SPINLOCK(mk712_lock);
83 static irqreturn_t mk712_interrupt(int irq, void *dev_id, struct pt_regs *regs)
86 static int debounce = 1;
87 static unsigned short last_x;
88 static unsigned short last_y;
90 spin_lock(&mk712_lock);
91 input_regs(&mk712_dev, regs);
93 status = inb(mk712_io + MK712_STATUS);
95 if (~status & MK712_CONVERSION_COMPLETE) {
100 if (~status & MK712_STATUS_TOUCH)
103 input_report_key(&mk712_dev, BTN_TOUCH, 0);
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);
119 last_x = inw(mk712_io + MK712_X) & 0x0fff;
120 last_y = inw(mk712_io + MK712_Y) & 0x0fff;
121 input_sync(&mk712_dev);
122 spin_unlock(&mk712_lock);
126 static int mk712_open(struct input_dev *dev)
130 spin_lock_irqsave(&mk712_lock, flags);
132 outb(0, mk712_io + MK712_CONTROL); /* Reset */
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);
139 outb(10, mk712_io + MK712_RATE); /* 187 points per second */
141 spin_unlock_irqrestore(&mk712_lock, flags);
146 static void mk712_close(struct input_dev *dev)
150 spin_lock_irqsave(&mk712_lock, flags);
152 outb(0, mk712_io + MK712_CONTROL);
154 spin_unlock_irqrestore(&mk712_lock, flags);
157 static struct input_dev mk712_dev = {
158 .evbit = { BIT(EV_KEY) | BIT(EV_ABS) },
159 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
160 .absbit = { BIT(ABS_X) | BIT(ABS_Y) },
162 .close = mk712_close,
163 .name = "ICS MicroClock MK712 TouchScreen",
164 .phys = "isa0260/input0",
165 .absmin = { [ABS_X] = 0, [ABS_Y] = 0 },
166 .absmax = { [ABS_X] = 0xfff, [ABS_Y] = 0xfff },
167 .absfuzz = { [ABS_X] = 88, [ABS_Y] = 88 },
176 int __init mk712_init(void)
179 if(!request_region(mk712_io, 8, "mk712"))
181 printk(KERN_WARNING "mk712: unable to get IO region\n");
185 outb(0, mk712_io + MK712_CONTROL);
187 if ((inw(mk712_io + MK712_X) & 0xf000) || /* Sanity check */
188 (inw(mk712_io + MK712_Y) & 0xf000) ||
189 (inw(mk712_io + MK712_STATUS) & 0xf333)) {
190 printk(KERN_WARNING "mk712: device not present\n");
191 release_region(mk712_io, 8);
195 if(request_irq(mk712_irq, mk712_interrupt, 0, "mk712", &mk712_dev))
197 printk(KERN_WARNING "mk712: unable to get IRQ\n");
198 release_region(mk712_io, 8);
202 input_register_device(&mk712_dev);
204 printk(KERN_INFO "input: ICS MicroClock MK712 TouchScreen at %#x irq %d\n", mk712_io, mk712_irq);
209 static void __exit mk712_exit(void)
211 input_unregister_device(&mk712_dev);
212 free_irq(mk712_irq, &mk712_dev);
213 release_region(mk712_io, 8);
216 module_init(mk712_init);
217 module_exit(mk712_exit);