1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Atari mouse driver for Linux/m68k
4  *
5  *  Copyright (c) 2005 Michael Schmitz
6  *
7  *  Based on:
8  *  Amiga mouse driver for Linux/m68k
9  *
10  *  Copyright (c) 2000-2002 Vojtech Pavlik
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 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/input.h>
41 #include <linux/interrupt.h>
42 
43 #include <asm/irq.h>
44 #include <asm/setup.h>
45 #include <linux/uaccess.h>
46 #include <asm/atarihw.h>
47 #include <asm/atarikb.h>
48 #include <asm/atariints.h>
49 
50 MODULE_AUTHOR("Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>");
51 MODULE_DESCRIPTION("Atari mouse driver");
52 MODULE_LICENSE("GPL");
53 
54 static int mouse_threshold[2] = {2, 2};
55 module_param_array(mouse_threshold, int, NULL, 0);
56 
57 #ifdef FIXED_ATARI_JOYSTICK
58 extern int atari_mouse_buttons;
59 #endif
60 
61 static struct input_dev *atamouse_dev;
62 
atamouse_interrupt(char * buf)63 static void atamouse_interrupt(char *buf)
64 {
65 	int buttons, dx, dy;
66 
67 	buttons = (buf[0] & 1) | ((buf[0] & 2) << 1);
68 #ifdef FIXED_ATARI_JOYSTICK
69 	buttons |= atari_mouse_buttons & 2;
70 	atari_mouse_buttons = buttons;
71 #endif
72 
73 	/* only relative events get here */
74 	dx = buf[1];
75 	dy = buf[2];
76 
77 	input_report_rel(atamouse_dev, REL_X, dx);
78 	input_report_rel(atamouse_dev, REL_Y, dy);
79 
80 	input_report_key(atamouse_dev, BTN_LEFT,   buttons & 0x4);
81 	input_report_key(atamouse_dev, BTN_MIDDLE, buttons & 0x2);
82 	input_report_key(atamouse_dev, BTN_RIGHT,  buttons & 0x1);
83 
84 	input_sync(atamouse_dev);
85 
86 	return;
87 }
88 
atamouse_open(struct input_dev * dev)89 static int atamouse_open(struct input_dev *dev)
90 {
91 #ifdef FIXED_ATARI_JOYSTICK
92 	atari_mouse_buttons = 0;
93 #endif
94 	ikbd_mouse_y0_top();
95 	ikbd_mouse_thresh(mouse_threshold[0], mouse_threshold[1]);
96 	ikbd_mouse_rel_pos();
97 	atari_input_mouse_interrupt_hook = atamouse_interrupt;
98 
99 	return 0;
100 }
101 
atamouse_close(struct input_dev * dev)102 static void atamouse_close(struct input_dev *dev)
103 {
104 	ikbd_mouse_disable();
105 	atari_input_mouse_interrupt_hook = NULL;
106 }
107 
atamouse_init(void)108 static int __init atamouse_init(void)
109 {
110 	int error;
111 
112 	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(ST_MFP))
113 		return -ENODEV;
114 
115 	error = atari_keyb_init();
116 	if (error)
117 		return error;
118 
119 	atamouse_dev = input_allocate_device();
120 	if (!atamouse_dev)
121 		return -ENOMEM;
122 
123 	atamouse_dev->name = "Atari mouse";
124 	atamouse_dev->phys = "atamouse/input0";
125 	atamouse_dev->id.bustype = BUS_HOST;
126 	atamouse_dev->id.vendor = 0x0001;
127 	atamouse_dev->id.product = 0x0002;
128 	atamouse_dev->id.version = 0x0100;
129 
130 	atamouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
131 	atamouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
132 	atamouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
133 		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
134 
135 	atamouse_dev->open = atamouse_open;
136 	atamouse_dev->close = atamouse_close;
137 
138 	error = input_register_device(atamouse_dev);
139 	if (error) {
140 		input_free_device(atamouse_dev);
141 		return error;
142 	}
143 
144 	return 0;
145 }
146 
atamouse_exit(void)147 static void __exit atamouse_exit(void)
148 {
149 	input_unregister_device(atamouse_dev);
150 }
151 
152 module_init(atamouse_init);
153 module_exit(atamouse_exit);
154