tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
32#include <linux/module.h>
33#include <linux/delay.h>
34#include <linux/ioport.h>
35#include <linux/init.h>
36#include <linux/input.h>
37#include <linux/interrupt.h>
38
39#include <asm/io.h>
40#include <asm/irq.h>
41
42MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
43MODULE_DESCRIPTION("Logitech busmouse driver");
44MODULE_LICENSE("GPL");
45
46#define LOGIBM_BASE 0x23c
47#define LOGIBM_EXTENT 4
48
49#define LOGIBM_DATA_PORT LOGIBM_BASE + 0
50#define LOGIBM_SIGNATURE_PORT LOGIBM_BASE + 1
51#define LOGIBM_CONTROL_PORT LOGIBM_BASE + 2
52#define LOGIBM_CONFIG_PORT LOGIBM_BASE + 3
53
54#define LOGIBM_ENABLE_IRQ 0x00
55#define LOGIBM_DISABLE_IRQ 0x10
56#define LOGIBM_READ_X_LOW 0x80
57#define LOGIBM_READ_X_HIGH 0xa0
58#define LOGIBM_READ_Y_LOW 0xc0
59#define LOGIBM_READ_Y_HIGH 0xe0
60
61#define LOGIBM_DEFAULT_MODE 0x90
62#define LOGIBM_CONFIG_BYTE 0x91
63#define LOGIBM_SIGNATURE_BYTE 0xa5
64
65#define LOGIBM_IRQ 5
66
67static int logibm_irq = LOGIBM_IRQ;
68module_param_hw_named(irq, logibm_irq, uint, irq, 0);
69MODULE_PARM_DESC(irq, "IRQ number (5=default)");
70
71static struct input_dev *logibm_dev;
72
73static irqreturn_t logibm_interrupt(int irq, void *dev_id)
74{
75 char dx, dy;
76 unsigned char buttons;
77
78 outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
79 dx = (inb(LOGIBM_DATA_PORT) & 0xf);
80 outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
81 dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
82 outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
83 dy = (inb(LOGIBM_DATA_PORT) & 0xf);
84 outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
85 buttons = inb(LOGIBM_DATA_PORT);
86 dy |= (buttons & 0xf) << 4;
87 buttons = ~buttons >> 5;
88
89 input_report_rel(logibm_dev, REL_X, dx);
90 input_report_rel(logibm_dev, REL_Y, dy);
91 input_report_key(logibm_dev, BTN_RIGHT, buttons & 1);
92 input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
93 input_report_key(logibm_dev, BTN_LEFT, buttons & 4);
94 input_sync(logibm_dev);
95
96 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
97 return IRQ_HANDLED;
98}
99
100static int logibm_open(struct input_dev *dev)
101{
102 if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
103 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
104 return -EBUSY;
105 }
106 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
107 return 0;
108}
109
110static void logibm_close(struct input_dev *dev)
111{
112 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
113 free_irq(logibm_irq, NULL);
114}
115
116static int __init logibm_init(void)
117{
118 int err;
119
120 if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
121 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
122 return -EBUSY;
123 }
124
125 outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
126 outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
127 udelay(100);
128
129 if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
130 printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
131 err = -ENODEV;
132 goto err_release_region;
133 }
134
135 outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
136 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
137
138 logibm_dev = input_allocate_device();
139 if (!logibm_dev) {
140 printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
141 err = -ENOMEM;
142 goto err_release_region;
143 }
144
145 logibm_dev->name = "Logitech bus mouse";
146 logibm_dev->phys = "isa023c/input0";
147 logibm_dev->id.bustype = BUS_ISA;
148 logibm_dev->id.vendor = 0x0003;
149 logibm_dev->id.product = 0x0001;
150 logibm_dev->id.version = 0x0100;
151
152 logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
153 logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
154 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
155 logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
156
157 logibm_dev->open = logibm_open;
158 logibm_dev->close = logibm_close;
159
160 err = input_register_device(logibm_dev);
161 if (err)
162 goto err_free_dev;
163
164 return 0;
165
166 err_free_dev:
167 input_free_device(logibm_dev);
168 err_release_region:
169 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
170
171 return err;
172}
173
174static void __exit logibm_exit(void)
175{
176 input_unregister_device(logibm_dev);
177 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
178}
179
180module_init(logibm_init);
181module_exit(logibm_exit);