1/*
2 * $Id: logibm.c,v 1.1.1.1 2007/08/03 18:52:33 Exp $
3 *
4 *  Copyright (c) 1999-2001 Vojtech Pavlik
5 *
6 *  Based on the work of:
7 *	James Banks		Matthew Dillon
8 *	David Giller		Nathan Laredo
9 *	Linus Torvalds		Johan Myreen
10 *	Cliff Matthews		Philip Blundell
11 *	Russell King
12 */
13
14/*
15 * Logitech Bus Mouse Driver for Linux
16 */
17
18/*
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 *
33 * Should you need to contact me, the author, you can do so either by
34 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
35 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
36 */
37
38#include <linux/module.h>
39#include <linux/moduleparam.h>
40#include <linux/delay.h>
41#include <linux/ioport.h>
42#include <linux/init.h>
43#include <linux/input.h>
44#include <linux/interrupt.h>
45
46#include <asm/io.h>
47#include <asm/irq.h>
48
49MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
50MODULE_DESCRIPTION("Logitech busmouse driver");
51MODULE_LICENSE("GPL");
52
53#define	LOGIBM_BASE		0x23c
54#define	LOGIBM_EXTENT		4
55
56#define	LOGIBM_DATA_PORT	LOGIBM_BASE + 0
57#define	LOGIBM_SIGNATURE_PORT	LOGIBM_BASE + 1
58#define	LOGIBM_CONTROL_PORT	LOGIBM_BASE + 2
59#define	LOGIBM_CONFIG_PORT	LOGIBM_BASE + 3
60
61#define	LOGIBM_ENABLE_IRQ	0x00
62#define	LOGIBM_DISABLE_IRQ	0x10
63#define	LOGIBM_READ_X_LOW	0x80
64#define	LOGIBM_READ_X_HIGH	0xa0
65#define	LOGIBM_READ_Y_LOW	0xc0
66#define	LOGIBM_READ_Y_HIGH	0xe0
67
68#define LOGIBM_DEFAULT_MODE	0x90
69#define LOGIBM_CONFIG_BYTE	0x91
70#define LOGIBM_SIGNATURE_BYTE	0xa5
71
72#define LOGIBM_IRQ		5
73
74static int logibm_irq = LOGIBM_IRQ;
75module_param_named(irq, logibm_irq, uint, 0);
76MODULE_PARM_DESC(irq, "IRQ number (5=default)");
77
78static struct input_dev *logibm_dev;
79
80static irqreturn_t logibm_interrupt(int irq, void *dev_id)
81{
82	char dx, dy;
83	unsigned char buttons;
84
85	outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
86	dx = (inb(LOGIBM_DATA_PORT) & 0xf);
87	outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
88	dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
89	outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
90	dy = (inb(LOGIBM_DATA_PORT) & 0xf);
91	outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
92	buttons = inb(LOGIBM_DATA_PORT);
93	dy |= (buttons & 0xf) << 4;
94	buttons = ~buttons >> 5;
95
96	input_report_rel(logibm_dev, REL_X, dx);
97	input_report_rel(logibm_dev, REL_Y, dy);
98	input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
99	input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
100	input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
101	input_sync(logibm_dev);
102
103	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
104	return IRQ_HANDLED;
105}
106
107static int logibm_open(struct input_dev *dev)
108{
109	if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
110		printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
111		return -EBUSY;
112	}
113	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
114	return 0;
115}
116
117static void logibm_close(struct input_dev *dev)
118{
119	outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
120	free_irq(logibm_irq, NULL);
121}
122
123static int __init logibm_init(void)
124{
125	int err;
126
127	if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
128		printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
129		return -EBUSY;
130	}
131
132	outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
133	outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
134	udelay(100);
135
136	if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
137		printk(KERN_ERR "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
138		err = -ENODEV;
139		goto err_release_region;
140	}
141
142	outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
143	outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
144
145	logibm_dev = input_allocate_device();
146	if (!logibm_dev) {
147		printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
148		err = -ENOMEM;
149		goto err_release_region;
150	}
151
152	logibm_dev->name = "Logitech bus mouse";
153	logibm_dev->phys = "isa023c/input0";
154	logibm_dev->id.bustype = BUS_ISA;
155	logibm_dev->id.vendor  = 0x0003;
156	logibm_dev->id.product = 0x0001;
157	logibm_dev->id.version = 0x0100;
158
159	logibm_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
160	logibm_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
161	logibm_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
162
163	logibm_dev->open  = logibm_open;
164	logibm_dev->close = logibm_close;
165
166	err = input_register_device(logibm_dev);
167	if (err)
168		goto err_free_dev;
169
170	return 0;
171
172 err_free_dev:
173	input_free_device(logibm_dev);
174 err_release_region:
175	release_region(LOGIBM_BASE, LOGIBM_EXTENT);
176
177	return err;
178}
179
180static void __exit logibm_exit(void)
181{
182	input_unregister_device(logibm_dev);
183	release_region(LOGIBM_BASE, LOGIBM_EXTENT);
184}
185
186module_init(logibm_init);
187module_exit(logibm_exit);
188