LXR linux/drivers/input/mouse/rpcmouse.c

   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(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