1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 1999-2001 Vojtech Pavlik
4 *
5 * Based on the work of:
6 * James Banks Matthew Dillon
7 * David Giller Nathan Laredo
8 * Linus Torvalds Johan Myreen
9 * Cliff Matthews Philip Blundell
10 * Russell King
11 */
12
13/*
14 * Logitech Bus Mouse Driver for Linux
15 */
16
17#include <linux/module.h>
18#include <linux/delay.h>
19#include <linux/ioport.h>
20#include <linux/init.h>
21#include <linux/input.h>
22#include <linux/interrupt.h>
23
24#include <asm/io.h>
25#include <asm/irq.h>
26
27MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
28MODULE_DESCRIPTION("Logitech busmouse driver");
29MODULE_LICENSE("GPL");
30
31#define LOGIBM_BASE 0x23c
32#define LOGIBM_EXTENT 4
33
34#define LOGIBM_DATA_PORT LOGIBM_BASE + 0
35#define LOGIBM_SIGNATURE_PORT LOGIBM_BASE + 1
36#define LOGIBM_CONTROL_PORT LOGIBM_BASE + 2
37#define LOGIBM_CONFIG_PORT LOGIBM_BASE + 3
38
39#define LOGIBM_ENABLE_IRQ 0x00
40#define LOGIBM_DISABLE_IRQ 0x10
41#define LOGIBM_READ_X_LOW 0x80
42#define LOGIBM_READ_X_HIGH 0xa0
43#define LOGIBM_READ_Y_LOW 0xc0
44#define LOGIBM_READ_Y_HIGH 0xe0
45
46#define LOGIBM_DEFAULT_MODE 0x90
47#define LOGIBM_CONFIG_BYTE 0x91
48#define LOGIBM_SIGNATURE_BYTE 0xa5
49
50#define LOGIBM_IRQ 5
51
52static int logibm_irq = LOGIBM_IRQ;
53module_param_hw_named(irq, logibm_irq, uint, irq, 0);
54MODULE_PARM_DESC(irq, "IRQ number (5=default)");
55
56static struct input_dev *logibm_dev;
57
58static irqreturn_t logibm_interrupt(int irq, void *dev_id)
59{
60 char dx, dy;
61 unsigned char buttons;
62
63 outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
64 dx = (inb(LOGIBM_DATA_PORT) & 0xf);
65 outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
66 dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
67 outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
68 dy = (inb(LOGIBM_DATA_PORT) & 0xf);
69 outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
70 buttons = inb(LOGIBM_DATA_PORT);
71 dy |= (buttons & 0xf) << 4;
72 buttons = ~buttons >> 5;
73
74 input_report_rel(dev: logibm_dev, REL_X, value: dx);
75 input_report_rel(dev: logibm_dev, REL_Y, value: dy);
76 input_report_key(dev: logibm_dev, BTN_RIGHT, value: buttons & 1);
77 input_report_key(dev: logibm_dev, BTN_MIDDLE, value: buttons & 2);
78 input_report_key(dev: logibm_dev, BTN_LEFT, value: buttons & 4);
79 input_sync(dev: logibm_dev);
80
81 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
82 return IRQ_HANDLED;
83}
84
85static int logibm_open(struct input_dev *dev)
86{
87 if (request_irq(irq: logibm_irq, handler: logibm_interrupt, flags: 0, name: "logibm", NULL)) {
88 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
89 return -EBUSY;
90 }
91 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
92 return 0;
93}
94
95static void logibm_close(struct input_dev *dev)
96{
97 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
98 free_irq(logibm_irq, NULL);
99}
100
101static int __init logibm_init(void)
102{
103 int err;
104
105 if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
106 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
107 return -EBUSY;
108 }
109
110 outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
111 outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
112 udelay(usec: 100);
113
114 if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
115 printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
116 err = -ENODEV;
117 goto err_release_region;
118 }
119
120 outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
121 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
122
123 logibm_dev = input_allocate_device();
124 if (!logibm_dev) {
125 printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
126 err = -ENOMEM;
127 goto err_release_region;
128 }
129
130 logibm_dev->name = "Logitech bus mouse";
131 logibm_dev->phys = "isa023c/input0";
132 logibm_dev->id.bustype = BUS_ISA;
133 logibm_dev->id.vendor = 0x0003;
134 logibm_dev->id.product = 0x0001;
135 logibm_dev->id.version = 0x0100;
136
137 logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
138 logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
139 BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
140 logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
141
142 logibm_dev->open = logibm_open;
143 logibm_dev->close = logibm_close;
144
145 err = input_register_device(logibm_dev);
146 if (err)
147 goto err_free_dev;
148
149 return 0;
150
151 err_free_dev:
152 input_free_device(dev: logibm_dev);
153 err_release_region:
154 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
155
156 return err;
157}
158
159static void __exit logibm_exit(void)
160{
161 input_unregister_device(logibm_dev);
162 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
163}
164
165module_init(logibm_init);
166module_exit(logibm_exit);
167

source code of linux/drivers/input/mouse/logibm.c