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:
20 * http://www.icst.com/pdf/mk712.pdf
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/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
79 static struct input_dev *mk712_dev;
80 static DEFINE_SPINLOCK(mk712_lock);
81
82 static irqreturn_t mk712_interrupt(int irq, void *dev_id)
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);
90
91 status = inb(mk712_io + MK712_STATUS);
92
93 if (~status & MK712_CONVERSION_COMPLETE) {
94 debounce = 1;
95 goto end;
96 }
97
98 if (~status & MK712_STATUS_TOUCH) {
99 debounce = 1;
100 input_report_key(mk712_dev, BTN_TOUCH, 0);
101 goto end;
102 }
103
104 if (debounce) {
105 debounce = 0;
106 goto end;
107 }
108
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);
112
113 end:
114 last_x = inw(mk712_io + MK712_X) & 0x0fff;
115 last_y = inw(mk712_io + MK712_Y) & 0x0fff;
116 input_sync(mk712_dev);
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
127 outb(0, mk712_io + MK712_CONTROL); /* Reset */
128
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);
133
134 outb(10, mk712_io + MK712_RATE); /* 187 points per second */
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
147 outb(0, mk712_io + MK712_CONTROL);
148
149 spin_unlock_irqrestore(&mk712_lock, flags);
150 }
151
152 static int __init mk712_init(void)
153 {
154 int err;
155
156 if (!request_region(mk712_io, 8, "mk712")) {
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");
167 err = -ENODEV;
168 goto fail1;
169 }
170
171 mk712_dev = input_allocate_device();
172 if (!mk712_dev) {
173 printk(KERN_ERR "mk712: not enough memory\n");
174 err = -ENOMEM;
175 goto fail1;
176 }
177
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;
187
188 mk712_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
189 mk712_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
190 input_set_abs_params(mk712_dev, ABS_X, 0, 0xfff, 88, 0);
191 input_set_abs_params(mk712_dev, ABS_Y, 0, 0xfff, 88, 0);
192
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;
196 goto fail1;
197 }
198
199 err = input_register_device(mk712_dev);
200 if (err)
201 goto fail2;
202
203 return 0;
204
205 fail2: free_irq(mk712_irq, mk712_dev);
206 fail1: input_free_device(mk712_dev);
207 release_region(mk712_io, 8);
208 return err;
209 }
210
211 static void __exit mk712_exit(void)
212 {
213 input_unregister_device(mk712_dev);
214 free_irq(mk712_irq, mk712_dev);
215 release_region(mk712_io, 8);
216 }
217
218 module_init(mk712_init);
219 module_exit(mk712_exit);
220
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