drivers/input/mouse/rpcmouse.c

   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
  28 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  29 MODULE_DESCRIPTION("Acorn RiscPC mouse driver");
  30 MODULE_LICENSE("GPL");
  31
  32 static short rpcmouse_lastx, rpcmouse_lasty;
  33 static struct input_dev *rpcmouse_dev;
  34
  35 static 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
  63 static 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
 106 static void __exit rpcmouse_exit(void)
 107 {
 108         free_irq(IRQ_VSYNCPULSE, rpcmouse_dev);
 109         input_unregister_device(rpcmouse_dev);
 110 }
 111
 112 module_init(rpcmouse_init);
 113 module_exit(rpcmouse_exit);