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/*
* linux/drivers/char/mouse_rpc.c
*
* Copyright (C) 1996-1998 Russell King
*
* This handles the Acorn RiscPCs mouse. We basically have a couple
* of hardware registers that track the sensor count for the X-Y movement
* and another register holding the button state. On every VSYNC interrupt
* we read the complete state and then work out if something has changed.
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/iomd.h>
#include "../../char/busmouse.h"
static short old_x, old_y, old_b;
static int mousedev;
void
mouse_rpc_irq(int irq, void *dev_id, struct pt_regs *regs)
{
short x, y, dx, dy;
int buttons;
x = (short)inl(IOMD_MOUSEX);
y = (short)inl(IOMD_MOUSEY);
buttons = (inl (0x800C4000) >> 4) & 7;
dx = x - old_x;
old_x = x;
dy = y - old_y;
old_y = y;
if (dx || dy || buttons != old_b) {
busmouse_add_movementbuttons(mousedev, dx, dy, buttons);
old_b = buttons;
}
}
static struct busmouse rpcmouse = {
6, "arcmouse", NULL, NULL, 7
};
static int __init mouse_rpc_init(void)
{
mousedev = register_busmouse(&rpcmouse);
if (mousedev < 0)
printk("rpcmouse: could not register mouse driver\n");
else {
old_x = (short)inl(IOMD_MOUSEX);
old_y = (short)inl(IOMD_MOUSEY);
old_b = (inl (0x800C4000) >> 4) & 7;
if (request_irq(IRQ_VSYNCPULSE, mouse_rpc_irq, SA_SHIRQ, "mouse", &mousedev)) {
printk("rpcmouse: unable to allocate VSYNC interrupt\n");
unregister_busmouse(mousedev);
mousedev = -1;
}
}
return mousedev >= 0 ? 0 : -ENODEV;
}
static void __exit mouse_rpc_exit(void)
{
if (mousedev >= 0) {
unregister_busmouse(mousedev);
free_irq(IRQ_VSYNCPULSE, &mousedev);
}
}
module_init(mouse_rpc_init);
module_exit(mouse_rpc_exit);
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