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/*
 *  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/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");
MODULE_LICENSE("GPL");
 
static short rpcmouse_lastx, rpcmouse_lasty;
static struct input_dev *rpcmouse_dev;
 
static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
{
	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_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);
 
	input_sync(dev);
 
	return IRQ_HANDLED;
}
 
 
static int __init rpcmouse_init(void)
{
	int err;
 
	rpcmouse_dev = input_allocate_device();
	if (!rpcmouse_dev)
		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_MASK(EV_KEY) | BIT_MASK(EV_REL);
	rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
		BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
	rpcmouse_dev->relbit[0]	= BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 
	rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
	rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
 
	if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
		printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
		err = -EBUSY;
		goto err_free_dev;
	}
 
	err = input_register_device(rpcmouse_dev);
	if (err)
		goto err_free_irq;
 
	return 0;
 
 err_free_irq:
	free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
 err_free_dev:
	input_free_device(rpcmouse_dev);
 
	return err;
}
 
static void __exit rpcmouse_exit(void)
{
	free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
	input_unregister_device(rpcmouse_dev);
}
 
module_init(rpcmouse_init);
module_exit(rpcmouse_exit);