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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/ptrace.h>
22#include <linux/interrupt.h>
23#include <linux/init.h>
24#include <linux/input.h>
25
26#include <asm/hardware.h>
27#include <asm/irq.h>
28#include <asm/io.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;
Dmitry Torokhov2e5b6362005-09-15 02:01:44 -050036static struct input_dev *rpcmouse_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
David Howells7d12e782006-10-05 14:55:46 +010038static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
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(0xe0310000) ^ 0x70);
46
47 dx = x - rpcmouse_lastx;
Dmitry Torokhov968ac842005-05-29 02:28:29 -050048 dy = y - rpcmouse_lasty;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50 rpcmouse_lastx = x;
51 rpcmouse_lasty = y;
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 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
Dmitry Torokhov2e5b6362005-09-15 02:01:44 -050065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static int __init rpcmouse_init(void)
67{
Dmitry Torokhov72155612006-11-05 22:40:19 -050068 int err;
69
70 rpcmouse_dev = input_allocate_device();
71 if (!rpcmouse_dev)
Dmitry Torokhov2e5b6362005-09-15 02:01:44 -050072 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
Jiri Slaby7b19ada2007-10-18 23:40:32 -070081 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
87 rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
88
Thomas Gleixnerdace1452006-07-01 19:29:38 -070089 if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
Dmitry Torokhov72155612006-11-05 22:40:19 -050091 err = -EBUSY;
92 goto err_free_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 }
94
Dmitry Torokhov72155612006-11-05 22:40:19 -050095 err = input_register_device(rpcmouse_dev);
96 if (err)
97 goto err_free_irq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 return 0;
Dmitry Torokhov72155612006-11-05 22:40:19 -0500100
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
109static void __exit rpcmouse_exit(void)
110{
Dmitry Torokhov2e5b6362005-09-15 02:01:44 -0500111 free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
112 input_unregister_device(rpcmouse_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
115module_init(rpcmouse_init);
116module_exit(rpcmouse_exit);