xref: /openbmc/linux/drivers/input/mouse/logibm.c (revision 22246614)
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/delay.h>
40 #include <linux/ioport.h>
41 #include <linux/init.h>
42 #include <linux/input.h>
43 #include <linux/interrupt.h>
44 
45 #include <asm/io.h>
46 #include <asm/irq.h>
47 
48 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
49 MODULE_DESCRIPTION("Logitech busmouse driver");
50 MODULE_LICENSE("GPL");
51 
52 #define	LOGIBM_BASE		0x23c
53 #define	LOGIBM_EXTENT		4
54 
55 #define	LOGIBM_DATA_PORT	LOGIBM_BASE + 0
56 #define	LOGIBM_SIGNATURE_PORT	LOGIBM_BASE + 1
57 #define	LOGIBM_CONTROL_PORT	LOGIBM_BASE + 2
58 #define	LOGIBM_CONFIG_PORT	LOGIBM_BASE + 3
59 
60 #define	LOGIBM_ENABLE_IRQ	0x00
61 #define	LOGIBM_DISABLE_IRQ	0x10
62 #define	LOGIBM_READ_X_LOW	0x80
63 #define	LOGIBM_READ_X_HIGH	0xa0
64 #define	LOGIBM_READ_Y_LOW	0xc0
65 #define	LOGIBM_READ_Y_HIGH	0xe0
66 
67 #define LOGIBM_DEFAULT_MODE	0x90
68 #define LOGIBM_CONFIG_BYTE	0x91
69 #define LOGIBM_SIGNATURE_BYTE	0xa5
70 
71 #define LOGIBM_IRQ		5
72 
73 static int logibm_irq = LOGIBM_IRQ;
74 module_param_named(irq, logibm_irq, uint, 0);
75 MODULE_PARM_DESC(irq, "IRQ number (5=default)");
76 
77 static struct input_dev *logibm_dev;
78 
79 static irqreturn_t logibm_interrupt(int irq, void *dev_id)
80 {
81 	char dx, dy;
82 	unsigned char buttons;
83 
84 	outb(LOGIBM_READ_X_LOW, LOGIBM_CONTROL_PORT);
85 	dx = (inb(LOGIBM_DATA_PORT) & 0xf);
86 	outb(LOGIBM_READ_X_HIGH, LOGIBM_CONTROL_PORT);
87 	dx |= (inb(LOGIBM_DATA_PORT) & 0xf) << 4;
88 	outb(LOGIBM_READ_Y_LOW, LOGIBM_CONTROL_PORT);
89 	dy = (inb(LOGIBM_DATA_PORT) & 0xf);
90 	outb(LOGIBM_READ_Y_HIGH, LOGIBM_CONTROL_PORT);
91 	buttons = inb(LOGIBM_DATA_PORT);
92 	dy |= (buttons & 0xf) << 4;
93 	buttons = ~buttons >> 5;
94 
95 	input_report_rel(logibm_dev, REL_X, dx);
96 	input_report_rel(logibm_dev, REL_Y, dy);
97 	input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
98 	input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
99 	input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
100 	input_sync(logibm_dev);
101 
102 	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
103 	return IRQ_HANDLED;
104 }
105 
106 static int logibm_open(struct input_dev *dev)
107 {
108 	if (request_irq(logibm_irq, logibm_interrupt, 0, "logibm", NULL)) {
109 		printk(KERN_ERR "logibm.c: Can't allocate irq %d\n", logibm_irq);
110 		return -EBUSY;
111 	}
112 	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
113 	return 0;
114 }
115 
116 static void logibm_close(struct input_dev *dev)
117 {
118 	outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
119 	free_irq(logibm_irq, NULL);
120 }
121 
122 static int __init logibm_init(void)
123 {
124 	int err;
125 
126 	if (!request_region(LOGIBM_BASE, LOGIBM_EXTENT, "logibm")) {
127 		printk(KERN_ERR "logibm.c: Can't allocate ports at %#x\n", LOGIBM_BASE);
128 		return -EBUSY;
129 	}
130 
131 	outb(LOGIBM_CONFIG_BYTE, LOGIBM_CONFIG_PORT);
132 	outb(LOGIBM_SIGNATURE_BYTE, LOGIBM_SIGNATURE_PORT);
133 	udelay(100);
134 
135 	if (inb(LOGIBM_SIGNATURE_PORT) != LOGIBM_SIGNATURE_BYTE) {
136 		printk(KERN_INFO "logibm.c: Didn't find Logitech busmouse at %#x\n", LOGIBM_BASE);
137 		err = -ENODEV;
138 		goto err_release_region;
139 	}
140 
141 	outb(LOGIBM_DEFAULT_MODE, LOGIBM_CONFIG_PORT);
142 	outb(LOGIBM_DISABLE_IRQ, LOGIBM_CONTROL_PORT);
143 
144 	logibm_dev = input_allocate_device();
145 	if (!logibm_dev) {
146 		printk(KERN_ERR "logibm.c: Not enough memory for input device\n");
147 		err = -ENOMEM;
148 		goto err_release_region;
149 	}
150 
151 	logibm_dev->name = "Logitech bus mouse";
152 	logibm_dev->phys = "isa023c/input0";
153 	logibm_dev->id.bustype = BUS_ISA;
154 	logibm_dev->id.vendor  = 0x0003;
155 	logibm_dev->id.product = 0x0001;
156 	logibm_dev->id.version = 0x0100;
157 
158 	logibm_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
159 	logibm_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
160 		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
161 	logibm_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
162 
163 	logibm_dev->open  = logibm_open;
164 	logibm_dev->close = logibm_close;
165 
166 	err = input_register_device(logibm_dev);
167 	if (err)
168 		goto err_free_dev;
169 
170 	return 0;
171 
172  err_free_dev:
173 	input_free_device(logibm_dev);
174  err_release_region:
175 	release_region(LOGIBM_BASE, LOGIBM_EXTENT);
176 
177 	return err;
178 }
179 
180 static void __exit logibm_exit(void)
181 {
182 	input_unregister_device(logibm_dev);
183 	release_region(LOGIBM_BASE, LOGIBM_EXTENT);
184 }
185 
186 module_init(logibm_init);
187 module_exit(logibm_exit);
188