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/sched.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/init.h>
  25 #include <linux/input.h>
  26
  27 #include <asm/hardware.h>
  28 #include <asm/irq.h>
  29 #include <asm/io.h>
  30 #include <asm/hardware/iomd.h>
  31
  32 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  33 MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
  34 MODULE_LICENSE("GPL");
  35
  36 static short rpcmouse_lastx, rpcmouse_lasty;
  37 static struct input_dev *rpcmouse_dev;
  38
  39 static irqreturn_t rpcmouse_irq(int irq, void *dev_id)
  40 {
  41         struct input_dev *dev = dev_id;
  42         short x, y, dx, dy, b;
  43
  44         x = (short) iomd_readl(IOMD_MOUSEX);
  45         y = (short) iomd_readl(IOMD_MOUSEY);
  46         b = (short) (__raw_readl(0xe0310000) ^ 0x70);
  47
  48         dx = x - rpcmouse_lastx;
  49         dy = y - rpcmouse_lasty;
  50
  51         rpcmouse_lastx = x;
  52         rpcmouse_lasty = y;
  53
  54         input_report_rel(dev, REL_X, dx);
  55         input_report_rel(dev, REL_Y, -dy);
  56
  57         input_report_key(dev, BTN_LEFT,   b & 0x40);
  58         input_report_key(dev, BTN_MIDDLE, b & 0x20);
  59         input_report_key(dev, BTN_RIGHT,  b & 0x10);
  60
  61         input_sync(dev);
  62
  63         return IRQ_HANDLED;
  64 }
  65
  66
  67 static int __init rpcmouse_init(void)
  68 {
  69         if (!(rpcmouse_dev = input_allocate_device()))
  70                 return -ENOMEM;
  71
  72         rpcmouse_dev->name = "Acorn RiscPC Mouse";
  73         rpcmouse_dev->phys = "rpcmouse/input0";
  74         rpcmouse_dev->id.bustype = BUS_HOST;
  75         rpcmouse_dev->id.vendor  = 0x0005;
  76         rpcmouse_dev->id.product = 0x0001;
  77         rpcmouse_dev->id.version = 0x0100;
  78
  79         rpcmouse_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
  80         rpcmouse_dev->keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
  81         rpcmouse_dev->relbit[0] = BIT(REL_X) | BIT(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                 input_free_device(rpcmouse_dev);
  89                 return -EBUSY;
  90         }
  91
  92         input_register_device(rpcmouse_dev);
  93
  94         return 0;
  95 }
  96
  97 static void __exit rpcmouse_exit(void)
  98 {
  99         free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
 100         input_unregister_device(rpcmouse_dev);
 101 }
 102
 103 module_init(rpcmouse_init);
 104 module_exit(rpcmouse_exit);