/*
* $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 0x38
static 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 int pc110pad_used;
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)
{
if (!--pc110pad_used)
outb(PC110PAD_OFF, pc110pad_io + 2);
}
static int pc110pad_open(struct input_dev *dev)
{
if (pc110pad_used++)
return 0;
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);
