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
  38 static struct input_dev rpcmouse_dev = {
  39         .evbit  = { BIT(EV_KEY) | BIT(EV_REL) },
  40         .keybit = { [LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT) },
  41         .relbit = { BIT(REL_X) | BIT(REL_Y) },
  42         .name   = "Acorn RiscPC Mouse",
  43         .phys   = "rpcmouse/input0",
  44         .id     = {
  45                 .bustype = BUS_HOST,
  46                 .vendor  = 0x0005,
  47                 .product = 0x0001,
  48                 .version = 0x0100,
  49         },
  50 };
  51
  52 static irqreturn_t rpcmouse_irq(int irq, void *dev_id, struct pt_regs *regs)
  53 {
  54         struct input_dev *dev = dev_id;
  55         short x, y, dx, dy, b;
  56
  57         x = (short) iomd_readl(IOMD_MOUSEX);
  58         y = (short) iomd_readl(IOMD_MOUSEY);
  59         b = (short) (__raw_readl(0xe0310000) ^ 0x70);
  60
  61         dx = x - rpcmouse_lastx;
  62         dy = y - rpcmouse_lasty;
  63
  64         rpcmouse_lastx = x;
  65         rpcmouse_lasty = y;
  66
  67         input_regs(dev, regs);
  68
  69         input_report_rel(dev, REL_X, dx);
  70         input_report_rel(dev, REL_Y, -dy);
  71
  72         input_report_key(dev, BTN_LEFT,   b & 0x40);
  73         input_report_key(dev, BTN_MIDDLE, b & 0x20);
  74         input_report_key(dev, BTN_RIGHT,  b & 0x10);
  75
  76         input_sync(dev);
  77
  78         return IRQ_HANDLED;
  79 }
  80
  81 static int __init rpcmouse_init(void)
  82 {
  83         init_input_dev(&rpcmouse_dev);
  84
  85         rpcmouse_lastx = (short) iomd_readl(IOMD_MOUSEX);
  86         rpcmouse_lasty = (short) iomd_readl(IOMD_MOUSEY);
  87
  88         if (request_irq(IRQ_VSYNCPULSE, rpcmouse_irq, SA_SHIRQ, "rpcmouse", &rpcmouse_dev)) {
  89                 printk(KERN_ERR "rpcmouse: unable to allocate VSYNC interrupt\n");
  90                 return -1;
  91         }
  92
  93         input_register_device(&rpcmouse_dev);
  94
  95         printk(KERN_INFO "input: Acorn RiscPC mouse\n");
  96
  97         return 0;
  98 }
  99
 100 static void __exit rpcmouse_exit(void)
 101 {
 102         input_unregister_device(&rpcmouse_dev);
 103         free_irq(IRQ_VSYNCPULSE, &rpcmouse_dev);
 104 }
 105
 106 module_init(rpcmouse_init);
 107 module_exit(rpcmouse_exit);