1 /*
2 * $Id: logibm.c,v 1.11 2001/09/25 10:12:07 vojtech Exp $
3 *
4 * Copyright (c) 1999-2001 Vojtech Pavlik
5 *
6 * Based on the work of:
7 * James Banks Matthew Dillon
8 * David Giller Nathan Laredo
9 * Linus Torvalds Johan Myreen
10 * Cliff Matthews Philip Blundell
11 * Russell King
12 */
13
14 /*
15 * Logitech Bus Mouse Driver for Linux
16 */
17
18 /*
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 *
33 * Should you need to contact me, the author, you can do so either by
34 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
35 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
36 */
37
38 #include <linux/module.h>
39 #include <linux/moduleparam.h>
40 #include <linux/delay.h>
41 #include <linux/ioport.h>
42 #include <linux/init.h>
43 #include <linux/input.h>
44 #include <linux/interrupt.h>
45
46 #include <asm/io.h>
47 #include <asm/irq.h>
48
49 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
50 MODULE_DESCRIPTION("Logitech busmouse driver");
51 MODULE_LICENSE("GPL");
52
53 #define LOGIBM_BASE 0x23c
54 #define LOGIBM_EXTENT 4
55
56 #define LOGIBM_DATA_PORT LOGIBM_BASE + 0
57 #define LOGIBM_SIGNATURE_PORT LOGIBM_BASE + 1
58 #define LOGIBM_CONTROL_PORT LOGIBM_BASE + 2
59 #define LOGIBM_CONFIG_PORT LOGIBM_BASE + 3
60
61 #define LOGIBM_ENABLE_IRQ 0x00
62 #define LOGIBM_DISABLE_IRQ 0x10
63 #define LOGIBM_READ_X_LOW 0x80
64 #define LOGIBM_READ_X_HIGH 0xa0
65 #define LOGIBM_READ_Y_LOW 0xc0
66 #define LOGIBM_READ_Y_HIGH 0xe0
67
68 #define LOGIBM_DEFAULT_MODE 0x90
69 #define LOGIBM_CONFIG_BYTE 0x91
70 #define LOGIBM_SIGNATURE_BYTE 0xa5
71
72 #define LOGIBM_IRQ 5
73
74 static int logibm_irq = LOGIBM_IRQ;
75 module_param_named(irq, logibm_irq, uint, 0);
76 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
77
78 __obsolete_setup("logibm_irq=");
79
80 static int logibm_used = 0;
81
82 static irqreturn_t logibm_interrupt(int irq, void *dev_id, struct pt_regs *regs);
83
84 static int logibm_open(struct input_dev *dev)
85 {
86 if (logibm_used++)
87 return 0;
88 if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
89 logibm_used--;
90 printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
91 return -EBUSY;
92 }
93 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
94 return 0;
95 }
96
97 static void logibm_close(struct input_dev *dev)
98 {
99 if (--logibm_used)
100 return;
101 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
102 free_irq(logibm_irq, NULL);
103 }
104
105 static struct input_dev logibm_dev = {
106 .evbit = { BIT(EV_KEY) | BIT(EV_REL) },
107 .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT) },
108 .relbit = { BIT(REL_X) | BIT(REL_Y) },
109 .open = logibm_open,
110 .close = logibm_close,
111 .name = "Logitech bus mouse",
112 .phys = "isa023c/input0",
113 .id = {
114 .bustype = BUS_ISA,
115 .vendor = 0x0003,
116 .product = 0x0001,
117 .version = 0x0100,
118 },
119 };
120
121 static irqreturn_t logibm_interrupt(int irq, void *dev_id, struct pt_regs *regs)
122 {
123 char dx, dy;
124 unsigned char buttons;
125
126 outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
127 dx = (inb(LOGIBM_DATA_PORT) & 0xf);
128 outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
129 dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
130 outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
131 dy = (inb(LOGIBM_DATA_PORT) & 0xf);
132 outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
133 buttons = inb(LOGIBM_DATA_PORT);
134 dy |= (buttons & 0xf) << 4;
135 buttons = ~buttons >> 5;
136
137 input_regs(&logibm_dev, regs);
138 input_report_rel(&logibm_dev, REL_X, dx);
139 input_report_rel(&logibm_dev, REL_Y, dy);
140 input_report_key(&logibm_dev, BTN_RIGHT, buttons & 1);
141 input_report_key(&logibm_dev, BTN_MIDDLE, buttons & 2);
142 input_report_key(&logibm_dev, BTN_LEFT, buttons & 4);
143 input_sync(&logibm_dev);
144
145 outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
146 return IRQ_HANDLED;
147 }
148
149 static int __init logibm_init(void)
150 {
151 if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
152 printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
153 return -EBUSY;
154 }
155
156 outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
157 outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
158 udelay(100);
159
160 if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
161 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
162 printk(KERN_ERR "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
163 return -ENODEV;
164 }
165
166 outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
167 outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
168
169 input_register_device(&logibm_dev);
170
171 printk(KERN_INFO "input: Logitech bus mouse at %#x irq %d\n", LOGIBM_BASE, logibm_irq);
172
173 return 0;
174 }
175
176 static void __exit logibm_exit(void)
177 {
178 input_unregister_device(&logibm_dev);
179 release_region(LOGIBM_BASE, LOGIBM_EXTENT);
180 }
181
182 module_init(logibm_init);
183 module_exit(logibm_exit);
184
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