1 /*
2 * Amiga Mouse Driver for Linux 68k by Michael Rausch
3 * based upon:
4 *
5 * Logitech Bus Mouse Driver for Linux
6 * by James Banks
7 *
8 * Mods by Matthew Dillon
9 * calls verify_area()
10 * tracks better when X is busy or paging
11 *
12 * Heavily modified by David Giller
13 * changed from queue- to counter- driven
14 * hacked out a (probably incorrect) mouse_poll
15 *
16 * Modified again by Nathan Laredo to interface with
17 * 0.96c-pl1 IRQ handling changes (13JUL92)
18 * didn't bother touching poll code.
19 *
20 * Modified the poll() code blindly to conform to the VFS
21 * requirements. 92.07.14 - Linus. Somebody should test it out.
22 *
23 * Modified by Johan Myreen to make room for other mice (9AUG92)
24 * removed assignment chr_fops[10] = &mouse_fops; see mouse.c
25 * renamed mouse_fops => bus_mouse_fops, made bus_mouse_fops public.
26 * renamed this file mouse.c => busmouse.c
27 *
28 * Modified for use in the 1.3 kernels by Jes Sorensen.
29 *
30 * Moved the isr-allocation to the mouse_{open,close} calls, as there
31 * is no reason to service the mouse in the vertical blank isr if
32 * the mouse is not in use. Jes Sorensen
33 *
34 * Converted to use new generic busmouse code. 5 Apr 1998
35 * Russell King <rmk@arm.uk.linux.org>
36 */
37
38 #include <linux/module.h>
39
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched.h>
43 #include <linux/mm.h>
44 #include <linux/signal.h>
45 #include <linux/errno.h>
46 #include <linux/miscdevice.h>
47 #include <linux/random.h>
48 #include <linux/poll.h>
49 #include <linux/init.h>
50 #include <linux/ioport.h>
51 #include <linux/logibusmouse.h>
52
53 #include <asm/setup.h>
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
56 #include <asm/irq.h>
57 #include <asm/amigahw.h>
58 #include <asm/amigaints.h>
59
60 #include "busmouse.h"
61
62 #if AMIGA_OLD_INT
63 #define AMI_MSE_INT_ON() mouseint_allowed = 1
64 #define AMI_MSE_INT_OFF() mouseint_allowed = 0
65 static int mouseint_allowed;
66 #endif
67
68 static int msedev;
69
70 static void mouse_interrupt(int irq, void *dummy, struct pt_regs *fp)
71 {
72 static int lastx=0, lasty=0;
73 int dx, dy;
74 int nx, ny;
75 unsigned char buttons;
76
77 unsigned short joy0dat, potgor;
78
79 #if AMIGA_OLD_INT
80 if(!mouseint_allowed)
81 return;
82 AMI_MSE_INT_OFF();
83 #endif
84
85 /*
86 * This routine assumes, just like Kickstart, that the mouse
87 * has not moved more than 127 ticks since last VBL.
88 */
89
90 joy0dat = custom.joy0dat;
91
92 nx = joy0dat & 0xff;
93 ny = joy0dat >> 8;
94
95 dx = nx - lastx;
96 if (dx < - 127)
97 dx = (256 + nx) - lastx;
98
99 if (dx > 127)
100 dx = (nx - 256) - lastx;
101
102 dy = ny - lasty;
103 if (dy < - 127)
104 dy = (256 + ny) - lasty;
105
106 if (dy > 127)
107 dy = (ny - 256) - lasty;
108
109 lastx = nx;
110 lasty = ny;
111
112 #if 0
113 dx = -lastdx;
114 dx += (lastdx = joy0dat & 0xff);
115 if (dx < -127)
116 dx = -255-dx; /* underrun */
117 else
118 if (dx > 127)
119 dx = 255-dx; /* overflow */
120
121 dy = -lastdy;
122 dy += (lastdy = joy0dat >> 8);
123 if (dy < -127)
124 dy = -255-dy;
125 else
126 if (dy > 127)
127 dy = 255-dy;
128 #endif
129
130
131 potgor = custom.potgor;
132 buttons = (ciaa.pra & 0x40 ? 4 : 0) | /* left button; note that the bits are low-active, as are the expected results -> double negation */
133 #if 1
134 (potgor & 0x0100 ? 2 : 0) | /* middle button; emulation goes here */
135 #endif
136 (potgor & 0x0400 ? 1 : 0); /* right button */
137
138
139 busmouse_add_movementbuttons(msedev, dx, -dy, buttons);
140 #if AMIGA_OLD_INT
141 AMI_MSE_INT_ON();
142 #endif
143 }
144
145 /*
146 * close access to the mouse
147 */
148
149 static int release_mouse(struct inode * inode, struct file * file)
150 {
151 free_irq(IRQ_AMIGA_VERTB, mouse_interrupt);
152 #if AMIGA_OLD_INT
153 AMI_MSE_INT_OFF();
154 #endif
155 return 0;
156 }
157
158 /*
159 * open access to the mouse, currently only one open is
160 * allowed.
161 */
162
163 static int open_mouse(struct inode * inode, struct file * file)
164 {
165 /*
166 * use VBL to poll mouse deltas
167 */
168
169 if(request_irq(IRQ_AMIGA_VERTB, mouse_interrupt, 0,
170 "Amiga mouse", mouse_interrupt)) {
171 printk(KERN_INFO "Installing Amiga mouse failed.\n");
172 return -EIO;
173 }
174
175 #if AMIGA_OLD_INT
176 AMI_MSE_INT_ON();
177 #endif
178 return 0;
179 }
180
181 static struct busmouse amigamouse = {
182 AMIGAMOUSE_MINOR, "amigamouse", THIS_MODULE, open_mouse, release_mouse, 7
183 };
184
185 static int __init amiga_mouse_init(void)
186 {
187 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))
188 return -ENODEV;
189 if (!request_mem_region(CUSTOM_PHYSADDR+10, 2, "amigamouse [Denise]"))
190 return -EBUSY;
191
192 custom.joytest = 0; /* reset counters */
193 #if AMIGA_OLD_INT
194 AMI_MSE_INT_OFF();
195 #endif
196 msedev = register_busmouse(&amigamouse);
197 if (msedev < 0)
198 printk(KERN_WARNING "Unable to install Amiga mouse driver.\n");
199 else
200 printk(KERN_INFO "Amiga mouse installed.\n");
201 return msedev < 0 ? msedev : 0;
202 }
203
204 static void __exit amiga_mouse_exit(void)
205 {
206 unregister_busmouse(msedev);
207 release_mem_region(CUSTOM_PHYSADDR+10, 2);
208 }
209
210 module_init(amiga_mouse_init);
211 module_exit(amiga_mouse_exit);
212
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