1/*
2 *  Acorn RiscPC mouse driver for Linux/ARM
3 *
4 *  Copyright (c) 2000-2002 Vojtech Pavlik
5 *  Copyright (C) 1996-2002 Russell King
6 *
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
13 *
14 * This handles the Acorn RiscPCs mouse.  We basically have a couple of
15 * hardware registers that track the sensor count for the X-Y movement and
16 * another register holding the button state.  On every VSYNC interrupt we read
17 * the complete state and then work out if something has changed.
18 */
19
20#include <linux/module.h>
21#include <linux/ptrace.h>
22#include <linux/interrupt.h>
23#include <linux/init.h>
24#include <linux/input.h>
25#include <linux/io.h>
26
27#include <mach/hardware.h>
28#include <asm/irq.h>
29#include <asm/hardware/iomd.h>
30
31MODULE_AUTHOR("Vojtech Pavlik, Russell King");
32MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
33MODULE_LICENSE("GPL");
34
35static short rpcmouse_lastx, rpcmouse_lasty;
36static struct input_dev *rpcmouse_dev;
37
38static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
39{
40	struct input_dev *dev = dev_id;
41	short x, y, dx, dy, b;
42
43	x = (short) iomd_readl(IOMD_MOUSEX);
44	y = (short) iomd_readl(IOMD_MOUSEY);
45	b = (short) (__raw_readl(IOMEM(0xe0310000)) ^ 0x70);
46
47	dx = x - rpcmouse_lastx;
48	dy = y - rpcmouse_lasty;
49
50	rpcmouse_lastx = x;
51	rpcmouse_lasty = y;
52
53	input_report_rel(dev, REL_X, dx);
54	input_report_rel(dev, REL_Y, -dy);
55
56	input_report_key(dev, BTN_LEFT,   b & 0x40);
57	input_report_key(dev, BTN_MIDDLE, b & 0x20);
58	input_report_key(dev, BTN_RIGHT,  b & 0x10);
59
60	input_sync(dev);
61
62	return IRQ_HANDLED;
63}
64
65
66static int __init rpcmouse_init(void)
67{
68	int err;
69
70	rpcmouse_dev = input_allocate_device();
71	if (!rpcmouse_dev)
72		return -ENOMEM;
73
74	rpcmouse_dev->name = "Acorn RiscPC Mouse";
75	rpcmouse_dev->phys = "rpcmouse/input0";
76	rpcmouse_dev->id.bustype = BUS_HOST;
77	rpcmouse_dev->id.vendor  = 0x0005;
78	rpcmouse_dev->id.product = 0x0001;
79	rpcmouse_dev->id.version = 0x0100;
80
81	rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
82	rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
83		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
84	rpcmouse_dev->relbit[0]	= BIT_MASK(REL_X) | BIT_MASK(REL_Y);
85
86	rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
87	rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
88
89	if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
90		printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
91		err = -EBUSY;
92		goto err_free_dev;
93	}
94
95	err = input_register_device(rpcmouse_dev);
96	if (err)
97		goto err_free_irq;
98
99	return 0;
100
101 err_free_irq:
102	free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
103 err_free_dev:
104	input_free_device(rpcmouse_dev);
105
106	return err;
107}
108
109static void __exit rpcmouse_exit(void)
110{
111	free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
112	input_unregister_device(rpcmouse_dev);
113}
114
115module_init(rpcmouse_init);
116module_exit(rpcmouse_exit);
117