xref: /openbmc/linux/drivers/input/mouse/logibm.c (revision 2d09ac95)
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 
logibm_interrupt(int irq,void * dev_id)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(logibm_dev, REL_X, dx);
75 	input_report_rel(logibm_dev, REL_Y, dy);
76 	input_report_key(logibm_dev, BTN_RIGHT,  buttons & 1);
77 	input_report_key(logibm_dev, BTN_MIDDLE, buttons & 2);
78 	input_report_key(logibm_dev, BTN_LEFT,   buttons & 4);
79 	input_sync(logibm_dev);
80 
81 	outb(LOGIBM_ENABLE_IRQ, LOGIBM_CONTROL_PORT);
82 	return IRQ_HANDLED;
83 }
84 
logibm_open(struct input_dev * dev)85 static int logibm_open(struct input_dev *dev)
86 {
87 	if (request_irq(logibm_irq, logibm_interrupt, 0, "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 
logibm_close(struct input_dev * dev)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 
logibm_init(void)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(logibm_dev);
153  err_release_region:
154 	release_region(LOGIBM_BASE, LOGIBM_EXTENT);
155 
156 	return err;
157 }
158 
logibm_exit(void)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