blob: 09b6ffdb7582b1f143d7172a166d45cfb843022b [file] [log] [blame]
* Acorn RiscPC mouse driver for Linux/ARM
* Copyright (c) 2000-2002 Vojtech Pavlik
* Copyright (C) 1996-2002 Russell King
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
* This handles the Acorn RiscPCs mouse. We basically have a couple of
* hardware registers that track the sensor count for the X-Y movement and
* another register holding the button state. On every VSYNC interrupt we read
* the complete state and then work out if something has changed.
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/input.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/hardware/iomd.h>
MODULE_AUTHOR("Vojtech Pavlik, Russell King");
MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
static short rpcmouse_lastx, rpcmouse_lasty;
static struct input_dev *rpcmouse_dev;
static irqreturn_t rpcmouse_irq(int irq, void *dev_id, struct pt_regs *regs)
struct input_dev *dev = dev_id;
short x, y, dx, dy, b;
x = (short) iomd_readl(IOMD_MOUSEX);
y = (short) iomd_readl(IOMD_MOUSEY);
b = (short) (__raw_readl(0xe0310000) ^ 0x70);
dx = x - rpcmouse_lastx;
dy = y - rpcmouse_lasty;
rpcmouse_lastx = x;
rpcmouse_lasty = y;
input_regs(dev, regs);
input_report_rel(dev, REL_X, dx);
input_report_rel(dev, REL_Y, -dy);
input_report_key(dev, BTN_LEFT, b & 0x40);
input_report_key(dev, BTN_MIDDLE, b & 0x20);
input_report_key(dev, BTN_RIGHT, b & 0x10);
static int __init rpcmouse_init(void)
if (!(rpcmouse_dev = input_allocate_device()))
return -ENOMEM;
rpcmouse_dev->name = "Acorn RiscPC Mouse";
rpcmouse_dev->phys = "rpcmouse/input0";
rpcmouse_dev->id.bustype = BUS_HOST;
rpcmouse_dev->id.vendor = 0x0005;
rpcmouse_dev->id.product = 0x0001;
rpcmouse_dev->id.version = 0x0100;
rpcmouse_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
rpcmouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
rpcmouse_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);
rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, SA_SHIRQ, "rpcmouse", rpcmouse_dev)) {
printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
return -EBUSY;
return 0;
static void __exit rpcmouse_exit(void)
free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);