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