linux/drivers/input/mouse/rpcmouse.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Acorn RiscPC mouse driver for Linux/ARM
   4 *
   5 *  Copyright (c) 2000-2002 Vojtech Pavlik
   6 *  Copyright (C) 1996-2002 Russell King
   7 */
   8
   9/*
  10 *
  11 * This handles the Acorn RiscPCs mouse.  We basically have a couple of
  12 * hardware registers that track the sensor count for the X-Y movement and
  13 * another register holding the button state.  On every VSYNC interrupt we read
  14 * the complete state and then work out if something has changed.
  15 */
  16
  17#include <linux/module.h>
  18#include <linux/ptrace.h>
  19#include <linux/interrupt.h>
  20#include <linux/init.h>
  21#include <linux/input.h>
  22#include <linux/io.h>
  23
  24#include <mach/hardware.h>
  25#include <asm/irq.h>
  26#include <asm/hardware/iomd.h>
  27
  28MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  29MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
  30MODULE_LICENSE("GPL");
  31
  32static short rpcmouse_lastx, rpcmouse_lasty;
  33static struct input_dev *rpcmouse_dev;
  34
  35static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
  36{
  37        struct input_dev *dev = dev_id;
  38        short x, y, dx, dy, b;
  39
  40        x = (short) iomd_readl(IOMD_MOUSEX);
  41        y = (short) iomd_readl(IOMD_MOUSEY);
  42        b = (short) (__raw_readl(IOMEM(0xe0310000)) ^ 0x70);
  43
  44        dx = x - rpcmouse_lastx;
  45        dy = y - rpcmouse_lasty;
  46
  47        rpcmouse_lastx = x;
  48        rpcmouse_lasty = y;
  49
  50        input_report_rel(dev, REL_X, dx);
  51        input_report_rel(dev, REL_Y, -dy);
  52
  53        input_report_key(dev, BTN_LEFT,   b & 0x40);
  54        input_report_key(dev, BTN_MIDDLE, b & 0x20);
  55        input_report_key(dev, BTN_RIGHT,  b & 0x10);
  56
  57        input_sync(dev);
  58
  59        return IRQ_HANDLED;
  60}
  61
  62
  63static int __init rpcmouse_init(void)
  64{
  65        int err;
  66
  67        rpcmouse_dev = input_allocate_device();
  68        if (!rpcmouse_dev)
  69                return -ENOMEM;
  70
  71        rpcmouse_dev->name = "Acorn RiscPC Mouse";
  72        rpcmouse_dev->phys = "rpcmouse/input0";
  73        rpcmouse_dev->id.bustype = BUS_HOST;
  74        rpcmouse_dev->id.vendor  = 0x0005;
  75        rpcmouse_dev->id.product = 0x0001;
  76        rpcmouse_dev->id.version = 0x0100;
  77
  78        rpcmouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
  79        rpcmouse_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
  80                BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
  81        rpcmouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
  82
  83        rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
  84        rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
  85
  86        if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, IRQF_SHARED, "rpcmouse", rpcmouse_dev)) {
  87                printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
  88                err = -EBUSY;
  89                goto err_free_dev;
  90        }
  91
  92        err = input_register_device(rpcmouse_dev);
  93        if (err)
  94                goto err_free_irq;
  95
  96        return 0;
  97
  98 err_free_irq:
  99        free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
 100 err_free_dev:
 101        input_free_device(rpcmouse_dev);
 102
 103        return err;
 104}
 105
 106static void __exit rpcmouse_exit(void)
 107{
 108        free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
 109        input_unregister_device(rpcmouse_dev);
 110}
 111
 112module_init(rpcmouse_init);
 113module_exit(rpcmouse_exit);
 114