File: /usr/src/linux/drivers/char/atixlmouse.c
1 /*
2 * ATI XL Bus Mouse Driver for Linux
3 * by Bob Harris (rth@sparta.com)
4 *
5 * Uses VFS interface for linux 0.98 (01OCT92)
6 *
7 * Modified by Chris Colohan (colohan@eecg.toronto.edu)
8 * Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
9 *
10 * Converted to use new generic busmouse code. 5 Apr 1998
11 * Russell King <rmk@arm.uk.linux.org>
12 *
13 * version 0.3a
14 */
15
16 #include <linux/module.h>
17
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/signal.h>
21 #include <linux/errno.h>
22 #include <linux/miscdevice.h>
23 #include <linux/random.h>
24 #include <linux/poll.h>
25 #include <linux/init.h>
26 #include <linux/ioport.h>
27
28 #include <asm/io.h>
29 #include <asm/uaccess.h>
30 #include <asm/system.h>
31 #include <asm/irq.h>
32
33 #include "busmouse.h"
34
35 #define ATIXL_MOUSE_IRQ 5 /* H/W interrupt # set up on ATIXL board */
36 #define ATIXL_BUSMOUSE 3 /* Minor device # (mknod c 10 3 /dev/bm) */
37
38 /* ATI XL Inport Busmouse Definitions */
39
40 #define ATIXL_MSE_DATA_PORT 0x23d
41 #define ATIXL_MSE_SIGNATURE_PORT 0x23e
42 #define ATIXL_MSE_CONTROL_PORT 0x23c
43
44 #define ATIXL_MSE_READ_BUTTONS 0x00
45 #define ATIXL_MSE_READ_X 0x01
46 #define ATIXL_MSE_READ_Y 0x02
47
48 /* Some nice ATI XL macros */
49
50 /* Select IR7, HOLD UPDATES (INT ENABLED), save X,Y */
51 #define ATIXL_MSE_DISABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
52 outb( (0x20 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
53
54 /* Select IR7, Enable updates (INT ENABLED) */
55 #define ATIXL_MSE_ENABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
56 outb( (0xdf & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
57
58 /* Select IR7 - Mode Register, NO INTERRUPTS */
59 #define ATIXL_MSE_INT_OFF() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
60 outb( (0xe7 & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
61
62 /* Select IR7 - Mode Register, DATA INTERRUPTS ENABLED */
63 #define ATIXL_MSE_INT_ON() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \
64 outb( (0x08 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }
65
66 /* Same general mouse structure */
67
68 static int msedev;
69
70 static void mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)
71 {
72 char dx, dy, buttons;
73
74 ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */
75 outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */
76 dx = inb( ATIXL_MSE_DATA_PORT);
77 outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */
78 dy = inb( ATIXL_MSE_DATA_PORT);
79 outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */
80 buttons = inb( ATIXL_MSE_DATA_PORT);
81 busmouse_add_movementbuttons(msedev, dx, -dy, buttons);
82 ATIXL_MSE_ENABLE_UPDATE();
83 }
84
85 static int release_mouse(struct inode * inode, struct file * file)
86 {
87 ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */
88 free_irq(ATIXL_MOUSE_IRQ, NULL);
89 return 0;
90 }
91
92 static int open_mouse(struct inode * inode, struct file * file)
93 {
94 if (request_irq(ATIXL_MOUSE_IRQ, mouse_interrupt, 0, "ATIXL mouse", NULL))
95 return -EBUSY;
96 ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */
97 return 0;
98 }
99
100 static struct busmouse atixlmouse = {
101 ATIXL_BUSMOUSE, "atixl", THIS_MODULE, open_mouse, release_mouse, 0
102 };
103
104 static int __init atixl_busmouse_init(void)
105 {
106 unsigned char a,b,c;
107
108 /*
109 * We must request the resource and claim it atomically
110 * nowdays. We can throw it away on error. Otherwise we
111 * may race another module load of the same I/O
112 */
113
114 if (!request_region(ATIXL_MSE_DATA_PORT, 3, "atixlmouse"))
115 return -EIO;
116
117 a = inb( ATIXL_MSE_SIGNATURE_PORT ); /* Get signature */
118 b = inb( ATIXL_MSE_SIGNATURE_PORT );
119 c = inb( ATIXL_MSE_SIGNATURE_PORT );
120 if (( a != b ) && ( a == c ))
121 printk(KERN_INFO "\nATI Inport ");
122 else
123 {
124 release_region(ATIXL_MSE_DATA_PORT,3);
125 return -EIO;
126 }
127 outb(0x80, ATIXL_MSE_CONTROL_PORT); /* Reset the Inport device */
128 outb(0x07, ATIXL_MSE_CONTROL_PORT); /* Select Internal Register 7 */
129 outb(0x0a, ATIXL_MSE_DATA_PORT); /* Data Interrupts 8+, 1=30hz, 2=50hz, 3=100hz, 4=200hz rate */
130
131 msedev = register_busmouse(&atixlmouse);
132 if (msedev < 0)
133 {
134 printk("Bus mouse initialisation error.\n");
135 release_region(ATIXL_MSE_DATA_PORT,3); /* Was missing */
136 }
137 else
138 printk("Bus mouse detected and installed.\n");
139 return msedev < 0 ? msedev : 0;
140 }
141
142 static void __exit atixl_cleanup (void)
143 {
144 release_region(ATIXL_MSE_DATA_PORT, 3);
145 unregister_busmouse(msedev);
146 }
147
148 module_init(atixl_busmouse_init);
149 module_exit(atixl_cleanup);
150
151 MODULE_LICENSE("GPL");
152