1 /*
2  *  Atari mouse driver for Linux/m68k
3  *
4  *  Copyright (c) 2005 Michael Schmitz
5  *
6  *  Based on:
7  *  Amiga mouse driver for Linux/m68k
8  *
9  *  Copyright (c) 2000-2002 Vojtech Pavlik
10  *
11  */
12 /*
13  * The low level init and interrupt stuff is handled in arch/mm68k/atari/atakeyb.c
14  * (the keyboard ACIA also handles the mouse and joystick data, and the keyboard
15  * interrupt is shared with the MIDI ACIA so MIDI data also get handled there).
16  * This driver only deals with handing key events off to the input layer.
17  *
18  * Largely based on the old:
19  *
20  * Atari Mouse Driver for Linux
21  * by Robert de Vries (robert@and.nl) 19Jul93
22  *
23  * 16 Nov 1994 Andreas Schwab
24  * Compatibility with busmouse
25  * Support for three button mouse (shamelessly stolen from MiNT)
26  * third button wired to one of the joystick directions on joystick 1
27  *
28  * 1996/02/11 Andreas Schwab
29  * Module support
30  * Allow multiple open's
31  *
32  * Converted to use new generic busmouse code.  5 Apr 1998
33  *   Russell King <rmk@arm.uk.linux.org>
34  */
35 
36 
37 /*
38  * This program is free software; you can redistribute it and/or modify it
39  * under the terms of the GNU General Public License version 2 as published by
40  * the Free Software Foundation
41  */
42 
43 #include <linux/module.h>
44 #include <linux/init.h>
45 #include <linux/input.h>
46 #include <linux/interrupt.h>
47 
48 #include <asm/irq.h>
49 #include <asm/setup.h>
50 #include <asm/uaccess.h>
51 #include <asm/atarihw.h>
52 #include <asm/atarikb.h>
53 #include <asm/atariints.h>
54 
55 MODULE_AUTHOR("Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>");
56 MODULE_DESCRIPTION("Atari mouse driver");
57 MODULE_LICENSE("GPL");
58 
59 static int mouse_threshold[2] = {2, 2};
60 module_param_array(mouse_threshold, int, NULL, 0);
61 
62 #ifdef FIXED_ATARI_JOYSTICK
63 extern int atari_mouse_buttons;
64 #endif
65 
66 static struct input_dev *atamouse_dev;
67 
atamouse_interrupt(char * buf)68 static void atamouse_interrupt(char *buf)
69 {
70 	int buttons, dx, dy;
71 
72 	buttons = (buf[0] & 1) | ((buf[0] & 2) << 1);
73 #ifdef FIXED_ATARI_JOYSTICK
74 	buttons |= atari_mouse_buttons & 2;
75 	atari_mouse_buttons = buttons;
76 #endif
77 
78 	/* only relative events get here */
79 	dx = buf[1];
80 	dy = buf[2];
81 
82 	input_report_rel(atamouse_dev, REL_X, dx);
83 	input_report_rel(atamouse_dev, REL_Y, dy);
84 
85 	input_report_key(atamouse_dev, BTN_LEFT,   buttons & 0x4);
86 	input_report_key(atamouse_dev, BTN_MIDDLE, buttons & 0x2);
87 	input_report_key(atamouse_dev, BTN_RIGHT,  buttons & 0x1);
88 
89 	input_sync(atamouse_dev);
90 
91 	return;
92 }
93 
atamouse_open(struct input_dev * dev)94 static int atamouse_open(struct input_dev *dev)
95 {
96 #ifdef FIXED_ATARI_JOYSTICK
97 	atari_mouse_buttons = 0;
98 #endif
99 	ikbd_mouse_y0_top();
100 	ikbd_mouse_thresh(mouse_threshold[0], mouse_threshold[1]);
101 	ikbd_mouse_rel_pos();
102 	atari_input_mouse_interrupt_hook = atamouse_interrupt;
103 
104 	return 0;
105 }
106 
atamouse_close(struct input_dev * dev)107 static void atamouse_close(struct input_dev *dev)
108 {
109 	ikbd_mouse_disable();
110 	atari_input_mouse_interrupt_hook = NULL;
111 }
112 
atamouse_init(void)113 static int __init atamouse_init(void)
114 {
115 	int error;
116 
117 	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ST_MFP))
118 		return -ENODEV;
119 
120 	error = atari_keyb_init();
121 	if (error)
122 		return error;
123 
124 	atamouse_dev = input_allocate_device();
125 	if (!atamouse_dev)
126 		return -ENOMEM;
127 
128 	atamouse_dev->name = "Atari mouse";
129 	atamouse_dev->phys = "atamouse/input0";
130 	atamouse_dev->id.bustype = BUS_HOST;
131 	atamouse_dev->id.vendor = 0x0001;
132 	atamouse_dev->id.product = 0x0002;
133 	atamouse_dev->id.version = 0x0100;
134 
135 	atamouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
136 	atamouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
137 	atamouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
138 		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
139 
140 	atamouse_dev->open = atamouse_open;
141 	atamouse_dev->close = atamouse_close;
142 
143 	error = input_register_device(atamouse_dev);
144 	if (error) {
145 		input_free_device(atamouse_dev);
146 		return error;
147 	}
148 
149 	return 0;
150 }
151 
atamouse_exit(void)152 static void __exit atamouse_exit(void)
153 {
154 	input_unregister_device(atamouse_dev);
155 }
156 
157 module_init(atamouse_init);
158 module_exit(atamouse_exit);
159