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
  26 #include <asm/hardware.h>
  27 #include <asm/irq.h>
  28 #include <asm/io.h>
  29 #include <asm/hardware/iomd.h>
  30
  31 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  32 MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
  33 MODULE_LICENSE("GPL");
  34
  35 static short rpcmouse_lastx, rpcmouse_lasty;
  36 static struct input_dev *rpcmouse_dev;
  37
  38 static 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
  66 static 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
 109 static void __exit rpcmouse_exit(void)
 110 {
 111         free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
 112         input_unregister_device(rpcmouse_dev);
 113 }
 114
 115 module_init(rpcmouse_init);
 116 module_exit(rpcmouse_exit);