summaryrefslogtreecommitdiff
path: root/drivers/input/mouse/logibm.c
blob: 0aab63dbc30a324f1a14b18073f25cf45bfd2c64 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  Based on the work of:
 *	James Banks		Matthew Dillon
 *	David Giller		Nathan Laredo
 *	Linus Torvalds		Johan Myreen
 *	Cliff Matthews		Philip Blundell
 *	Russell King
 */

/*
 * Logitech Bus Mouse Driver for Linux
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>

#include <asm/io.h>
#include <asm/irq.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Logitech busmouse driver");
MODULE_LICENSE("GPL");

#define	LOGIBM_BASE		0x23c
#define	LOGIBM_EXTENT		4

#define	LOGIBM_DATA_PORT	LOGIBM_BASE + 0
#define	LOGIBM_SIGNATURE_PORT	LOGIBM_BASE + 1
#define	LOGIBM_CONTROL_PORT	LOGIBM_BASE + 2
#define	LOGIBM_CONFIG_PORT	LOGIBM_BASE + 3

#define	LOGIBM_ENABLE_IRQ	0x00
#define	LOGIBM_DISABLE_IRQ	0x10
#define	LOGIBM_READ_X_LOW	0x80
#define	LOGIBM_READ_X_HIGH	0xa0
#define	LOGIBM_READ_Y_LOW	0xc0
#define	LOGIBM_READ_Y_HIGH	0xe0

#define LOGIBM_DEFAULT_MODE	0x90
#define LOGIBM_CONFIG_BYTE	0x91
#define LOGIBM_SIGNATURE_BYTE	0xa5

#define LOGIBM_IRQ		5

static int logibm_irq = LOGIBM_IRQ;
module_param_hw_named(irq, logibm_irq, uint, irq, 0);
MODULE_PARM_DESC(irq, "IRQ number (5=default)");

static struct input_dev *logibm_dev;

static irqreturn_t logibm_interrupt(int irq, void *dev_id)
{
	char dx, dy;
	unsigned char buttons;

	outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
	dx = (inb(LOGIBM_DATA_PORT) & 0xf);
	outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
	dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
	outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
	dy = (inb(LOGIBM_DATA_PORT) & 0xf);
	outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
	buttons = inb(LOGIBM_DATA_PORT);
	dy |= (buttons & 0xf) << 4;
	buttons = ~buttons >> 5;

	input_report_rel(logibm_dev, REL_X, dx);
	input_report_rel(logibm_dev, REL_Y, dy);
	input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
	input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
	input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
	input_sync(logibm_dev);

	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
	return IRQ_HANDLED;
}

static int logibm_open(struct input_dev *dev)
{
	if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
		printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
		return -EBUSY;
	}
	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
	return 0;
}

static void logibm_close(struct input_dev *dev)
{
	outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
	free_irq(logibm_irq, NULL);
}

static int __init logibm_init(void)
{
	int err;

	if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
		printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
		return -EBUSY;
	}

	outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
	outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
	udelay(100);

	if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
		printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
		err = -ENODEV;
		goto err_release_region;
	}

	outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
	outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);

	logibm_dev = input_allocate_device();
	if (!logibm_dev) {
		printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
		err = -ENOMEM;
		goto err_release_region;
	}

	logibm_dev->name = "Logitech bus mouse";
	logibm_dev->phys = "isa023c/input0";
	logibm_dev->id.bustype = BUS_ISA;
	logibm_dev->id.vendor  = 0x0003;
	logibm_dev->id.product = 0x0001;
	logibm_dev->id.version = 0x0100;

	logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
	logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);

	logibm_dev->open  = logibm_open;
	logibm_dev->close = logibm_close;

	err = input_register_device(logibm_dev);
	if (err)
		goto err_free_dev;

	return 0;

 err_free_dev:
	input_free_device(logibm_dev);
 err_release_region:
	release_region(LOGIBM_BASE, LOGIBM_EXTENT);

	return err;
}

static void __exit logibm_exit(void)
{
	input_unregister_device(logibm_dev);
	release_region(LOGIBM_BASE, LOGIBM_EXTENT);
}

module_init(logibm_init);
module_exit(logibm_exit);