/* * $Id: pc110pad.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $ * *  Copyright (c) 2000-2001 Vojtech Pavlik * *  Based on the work of: *	Alan Cox	Robin O'Leary *//* * IBM PC110 touchpad driver for Linux *//* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Should you need to contact me, the author, you can do so either by * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic */#include <linux/module.h>#include <linux/kernel.h>#include <linux/errno.h>#include <linux/ioport.h>#include <linux/input.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/pci.h>#include <asm/io.h>#include <asm/irq.h>MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");MODULE_DESCRIPTION("IBM PC110 touchpad driver");MODULE_LICENSE("GPL");#define PC110PAD_OFF	0x30#define PC110PAD_ON	0x38static int pc110pad_irq = 10;static int pc110pad_io = 0x15e0;static struct input_dev pc110pad_dev;static int pc110pad_data[3];static int pc110pad_count;static char *pc110pad_name = "IBM PC110 TouchPad";static char *pc110pad_phys = "isa15e0/input0";static irqreturn_t pc110pad_interrupt(int irq, void *ptr, struct pt_regs *regs){	int value     = inb_p(pc110pad_io);	int handshake = inb_p(pc110pad_io + 2);	outb_p(handshake |  1, pc110pad_io + 2);	outb_p(handshake & ~1, pc110pad_io + 2);	inb_p(0x64);	pc110pad_data[pc110pad_count++] = value;	if (pc110pad_count < 3)		return IRQ_HANDLED;	input_regs(&pc110pad_dev, regs);	input_report_key(&pc110pad_dev, BTN_TOUCH,		pc110pad_data[0] & 0x01);	input_report_abs(&pc110pad_dev, ABS_X,		pc110pad_data[1] | ((pc110pad_data[0] << 3) & 0x80) | ((pc110pad_data[0] << 1) & 0x100));	input_report_abs(&pc110pad_dev, ABS_Y,		pc110pad_data[2] | ((pc110pad_data[0] << 4) & 0x80));	input_sync(&pc110pad_dev);	pc110pad_count = 0;	return IRQ_HANDLED;}static void pc110pad_close(struct input_dev *dev){	outb(PC110PAD_OFF, pc110pad_io + 2);}static int pc110pad_open(struct input_dev *dev){	pc110pad_interrupt(0,NULL,NULL);	pc110pad_interrupt(0,NULL,NULL);	pc110pad_interrupt(0,NULL,NULL);	outb(PC110PAD_ON, pc110pad_io + 2);	pc110pad_count = 0;	return 0;}/* * We try to avoid enabling the hardware if it's not * there, but we don't know how to test. But we do know * that the PC110 is not a PCI system. So if we find any * PCI devices in the machine, we don't have a PC110. */static int __init pc110pad_init(void){	struct pci_dev *dev;	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);	if (dev) {		pci_dev_put(dev);		return -ENOENT;	}	if (!request_region(pc110pad_io, 4, "pc110pad")) {		printk(KERN_ERR "pc110pad: I/O area %#x-%#x in use.\n",				pc110pad_io, pc110pad_io + 4);		return -EBUSY;	}	outb(PC110PAD_OFF, pc110pad_io + 2);	if (request_irq(pc110pad_irq, pc110pad_interrupt, 0, "pc110pad", NULL))	{		release_region(pc110pad_io, 4);		printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);		return -EBUSY;	}        pc110pad_dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);        pc110pad_dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);        pc110pad_dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);	pc110pad_dev.absmax[ABS_X] = 0x1ff;	pc110pad_dev.absmax[ABS_Y] = 0x0ff;	pc110pad_dev.open = pc110pad_open;        pc110pad_dev.close = pc110pad_close;	pc110pad_dev.name = pc110pad_name;	pc110pad_dev.phys = pc110pad_phys;	pc110pad_dev.id.bustype = BUS_ISA;	pc110pad_dev.id.vendor = 0x0003;	pc110pad_dev.id.product = 0x0001;	pc110pad_dev.id.version = 0x0100;	input_register_device(&pc110pad_dev);	printk(KERN_INFO "input: %s at %#x irq %d\n",		pc110pad_name, pc110pad_io, pc110pad_irq);	return 0;}static void __exit pc110pad_exit(void){	input_unregister_device(&pc110pad_dev);	outb(PC110PAD_OFF, pc110pad_io + 2);	free_irq(pc110pad_irq, NULL);	release_region(pc110pad_io, 4);}module_init(pc110pad_init);module_exit(pc110pad_exit);