1 /*
2 * Microsoft busmouse driver based on Logitech driver (see busmouse.c)
3 *
4 * Microsoft BusMouse support by Teemu Rantanen (tvr@cs.hut.fi) (02AUG92)
5 *
6 * Microsoft Bus Mouse support modified by Derrick Cole (cole@concert.net)
7 * 8/28/92
8 *
9 * Microsoft Bus Mouse support folded into 0.97pl4 code
10 * by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92)
11 * Changes: Logitech and Microsoft support in the same kernel.
12 * Defined new constants in busmouse.h for MS mice.
13 * Added int mse_busmouse_type to distinguish busmouse types
14 * Added a couple of new functions to handle differences in using
15 * MS vs. Logitech (where the int variable wasn't appropriate).
16 *
17 * Modified by Peter Cervasio (address above) (26SEP92)
18 * Changes: Included code to (properly?) detect when a Microsoft mouse is
19 * really attached to the machine. Don't know what this does to
20 * Logitech bus mice, but all it does is read ports.
21 *
22 * Modified by Christoph Niemann (niemann@rubdv15.etdv.ruhr-uni-bochum.de)
23 * Changes: Better interrupt-handler (like in busmouse.c).
24 * Some changes to reduce code-size.
25 * Changed detection code to use inb_p() instead of doing empty
26 * loops to delay i/o.
27 *
28 * Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>
29 *
30 * Converted to use new generic busmouse code. 5 Apr 1998
31 * Russell King <rmk@arm.uk.linux.org>
32 *
33 * version 0.3b
34 */
35
36 #include <linux/module.h>
37
38 #include <linux/kernel.h>
39 #include <linux/ioport.h>
40 #include <linux/sched.h>
41 #include <linux/logibusmouse.h>
42 #include <linux/signal.h>
43 #include <linux/errno.h>
44 #include <linux/miscdevice.h>
45 #include <linux/random.h>
46 #include <linux/poll.h>
47 #include <linux/init.h>
48
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51 #include <asm/system.h>
52 #include <asm/irq.h>
53
54 #include "busmouse.h"
55
56 static int msedev;
57 static int mouse_irq = MOUSE_IRQ;
58
59 MODULE_PARM(mouse_irq, "i");
60
61 #ifndef MODULE
62
63 static int __init msmouse_setup(char *str)
64 {
65 int ints[4];
66
67 str = get_options(str, ARRAY_SIZE(ints), ints);
68
69 if (ints[0] > 0)
70 mouse_irq=ints[1];
71
72 return 1;
73 }
74
75 __setup("msmouse=",msmouse_setup);
76
77 #endif /* !MODULE */
78
79 static void ms_mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)
80 {
81 char dx, dy;
82 unsigned char buttons;
83
84 outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
85 outb((inb(MS_MSE_DATA_PORT) | 0x20), MS_MSE_DATA_PORT);
86
87 outb(MS_MSE_READ_X, MS_MSE_CONTROL_PORT);
88 dx = inb(MS_MSE_DATA_PORT);
89
90 outb(MS_MSE_READ_Y, MS_MSE_CONTROL_PORT);
91 dy = inb(MS_MSE_DATA_PORT);
92
93 outb(MS_MSE_READ_BUTTONS, MS_MSE_CONTROL_PORT);
94 buttons = ~(inb(MS_MSE_DATA_PORT)) & 0x07;
95
96 outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);
97 outb((inb(MS_MSE_DATA_PORT) & 0xdf), MS_MSE_DATA_PORT);
98
99 /* why did the original have:
100 * if (dx != 0 || dy != 0 || buttons != mouse.buttons ||
101 * ((~buttons) & 0x07))
102 * ^^^^^^^^^^^^^^^^^^^ this?
103 */
104 busmouse_add_movementbuttons(msedev, dx, -dy, buttons);
105 }
106
107 static int release_mouse(struct inode * inode, struct file * file)
108 {
109 MS_MSE_INT_OFF();
110 free_irq(mouse_irq, NULL);
111 return 0;
112 }
113
114 static int open_mouse(struct inode * inode, struct file * file)
115 {
116 if (request_irq(mouse_irq, ms_mouse_interrupt, 0, "MS Busmouse", NULL))
117 return -EBUSY;
118
119 outb(MS_MSE_START, MS_MSE_CONTROL_PORT);
120 MS_MSE_INT_ON();
121 return 0;
122 }
123
124 static struct busmouse msbusmouse = {
125 MICROSOFT_BUSMOUSE, "msbusmouse", THIS_MODULE, open_mouse, release_mouse, 0
126 };
127
128 static int __init ms_bus_mouse_init(void)
129 {
130 int present = 0;
131 int mse_byte, i;
132
133 if (check_region(MS_MSE_CONTROL_PORT, 0x04))
134 return -ENODEV;
135
136 if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
137
138 mse_byte = inb_p(MS_MSE_SIGNATURE_PORT);
139
140 for (i = 0; i < 4; i++) {
141 if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {
142 if (inb_p(MS_MSE_SIGNATURE_PORT) == mse_byte)
143 present = 1;
144 else
145 present = 0;
146 } else
147 present = 0;
148 }
149 }
150 if (present == 0)
151 return -EIO;
152 MS_MSE_INT_OFF();
153 request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse");
154 msedev = register_busmouse(&msbusmouse);
155 if (msedev < 0)
156 printk(KERN_WARNING "Unable to register msbusmouse driver.\n");
157 else
158 printk(KERN_INFO "Microsoft BusMouse detected and installed.\n");
159 return msedev < 0 ? msedev : 0;
160 }
161
162 static void __exit ms_bus_mouse_exit(void)
163 {
164 unregister_busmouse(msedev);
165 release_region(MS_MSE_CONTROL_PORT, 0x04);
166 }
167
168 module_init(ms_bus_mouse_init)
169 module_exit(ms_bus_mouse_exit)
170
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