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 | |
27 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>" ); |
28 | MODULE_DESCRIPTION("Logitech busmouse driver" ); |
29 | MODULE_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 | |
52 | static int logibm_irq = LOGIBM_IRQ; |
53 | module_param_hw_named(irq, logibm_irq, uint, irq, 0); |
54 | MODULE_PARM_DESC(irq, "IRQ number (5=default)" ); |
55 | |
56 | static struct input_dev *logibm_dev; |
57 | |
58 | static 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 | |
85 | static 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 | |
95 | static void logibm_close(struct input_dev *dev) |
96 | { |
97 | outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT); |
98 | free_irq(logibm_irq, NULL); |
99 | } |
100 | |
101 | static 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(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 | |
159 | static void __exit logibm_exit(void) |
160 | { |
161 | input_unregister_device(logibm_dev); |
162 | release_region(LOGIBM_BASE, LOGIBM_EXTENT); |
163 | } |
164 | |
165 | module_init(logibm_init); |
166 | module_exit(logibm_exit); |
167 | |