1/*
2 *  Copyright (c) 2000-2001 Vojtech Pavlik
3 *
4 *  Based on the work of:
5 *	Alan Cox	Robin O'Leary
6 */
7
8/*
9 * IBM PC110 touchpad driver for Linux
10 */
11
12/*
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 * Should you need to contact me, the author, you can do so either by
28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
30 */
31
32#include <linux/module.h>
33#include <linux/kernel.h>
34#include <linux/errno.h>
35#include <linux/ioport.h>
36#include <linux/input.h>
37#include <linux/init.h>
38#include <linux/interrupt.h>
39#include <linux/pci.h>
40#include <linux/delay.h>
41
42#include <asm/io.h>
43#include <asm/irq.h>
44
45MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
46MODULE_DESCRIPTION("IBM PC110 touchpad driver");
47MODULE_LICENSE("GPL");
48
49#define PC110PAD_OFF	0x30
50#define PC110PAD_ON	0x38
51
52static int pc110pad_irq = 10;
53static int pc110pad_io = 0x15e0;
54
55static struct input_dev *pc110pad_dev;
56static int pc110pad_data[3];
57static int pc110pad_count;
58
59static irqreturn_t pc110pad_interrupt(int irq, void *ptr)
60{
61	int value     = inb_p(pc110pad_io);
62	int handshake = inb_p(pc110pad_io + 2);
63
64	outb(handshake |  1, pc110pad_io + 2);
65	udelay(2);
66	outb(handshake & ~1, pc110pad_io + 2);
67	udelay(2);
68	inb_p(0x64);
69
70	pc110pad_data[pc110pad_count++] = value;
71
72	if (pc110pad_count < 3)
73		return IRQ_HANDLED;
74
75	input_report_key(pc110pad_dev, BTN_TOUCH,
76		pc110pad_data[0] & 0x01);
77	input_report_abs(pc110pad_dev, ABS_X,
78		pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));
79	input_report_abs(pc110pad_dev, ABS_Y,
80		pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));
81	input_sync(pc110pad_dev);
82
83	pc110pad_count = 0;
84	return IRQ_HANDLED;
85}
86
87static void pc110pad_close(struct input_dev *dev)
88{
89	outb(PC110PAD_OFF, pc110pad_io + 2);
90}
91
92static int pc110pad_open(struct input_dev *dev)
93{
94	pc110pad_interrupt(0, NULL);
95	pc110pad_interrupt(0, NULL);
96	pc110pad_interrupt(0, NULL);
97	outb(PC110PAD_ON, pc110pad_io + 2);
98	pc110pad_count = 0;
99
100	return 0;
101}
102
103/*
104 * We try to avoid enabling the hardware if it's not
105 * there, but we don't know how to test. But we do know
106 * that the PC110 is not a PCI system. So if we find any
107 * PCI devices in the machine, we don't have a PC110.
108 */
109static int __init pc110pad_init(void)
110{
111	int err;
112
113	if (!no_pci_devices())
114		return -ENODEV;
115
116	if (!request_region(pc110pad_io, 4, "pc110pad")) {
117		printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",
118				pc110pad_io, pc110pad_io + 4);
119		return -EBUSY;
120	}
121
122	outb(PC110PAD_OFF, pc110pad_io + 2);
123
124	if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL)) {
125		printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
126		err = -EBUSY;
127		goto err_release_region;
128	}
129
130	pc110pad_dev = input_allocate_device();
131	if (!pc110pad_dev) {
132		printk(KERN_ERR "pc110pad: Not enough memory.\n");
133		err = -ENOMEM;
134		goto err_free_irq;
135	}
136
137	pc110pad_dev->name = "IBM PC110 TouchPad";
138	pc110pad_dev->phys = "isa15e0/input0";
139	pc110pad_dev->id.bustype = BUS_ISA;
140	pc110pad_dev->id.vendor = 0x0003;
141	pc110pad_dev->id.product = 0x0001;
142	pc110pad_dev->id.version = 0x0100;
143
144	pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
145	pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
146	pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
147
148	input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
149	input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
150
151	pc110pad_dev->open = pc110pad_open;
152	pc110pad_dev->close = pc110pad_close;
153
154	err = input_register_device(pc110pad_dev);
155	if (err)
156		goto err_free_dev;
157
158	return 0;
159
160 err_free_dev:
161	input_free_device(pc110pad_dev);
162 err_free_irq:
163	free_irq(pc110pad_irq, NULL);
164 err_release_region:
165	release_region(pc110pad_io, 4);
166
167	return err;
168}
169
170static void __exit pc110pad_exit(void)
171{
172	outb(PC110PAD_OFF, pc110pad_io + 2);
173	free_irq(pc110pad_irq, NULL);
174	input_unregister_device(pc110pad_dev);
175	release_region(pc110pad_io, 4);
176}
177
178module_init(pc110pad_init);
179module_exit(pc110pad_exit);
180