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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2000-2001 Vojtech Pavlik
*
* Based on the work of:
* Alan Cox Robin O'Leary
*/
/*
* IBM PC110 touchpad driver for Linux
*/
/*
*/
#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 <linux/delay.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 irqreturn_t pc110pad_interrupt(int irq, void *ptr)
{
int value = inb_p(pc110pad_io);
int handshake = inb_p(pc110pad_io + 2);
outb(handshake | 1, pc110pad_io + 2);
udelay(2);
outb(handshake & ~1, pc110pad_io + 2);
udelay(2);
inb_p(0x64);
pc110pad_data[pc110pad_count++] = value;
if (pc110pad_count < 3)
return IRQ_HANDLED;
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);
pc110pad_interrupt(0, NULL);
pc110pad_interrupt(0, 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)
{
int err;
if (!no_pci_devices())
return -ENODEV;
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)) {
printk(KERN_ERR "pc110pad: Unable to get irq %d.\n", pc110pad_irq);
err = -EBUSY;
goto err_release_region;
}
pc110pad_dev = input_allocate_device();
if (!pc110pad_dev) {
printk(KERN_ERR "pc110pad: Not enough memory.\n");
err = -ENOMEM;
goto err_free_irq;
}
pc110pad_dev->name = "IBM PC110 TouchPad";
pc110pad_dev->phys = "isa15e0/input0";
pc110pad_dev->id.bustype = BUS_ISA;
pc110pad_dev->id.vendor = 0x0003;
pc110pad_dev->id.product = 0x0001;
pc110pad_dev->id.version = 0x0100;
pc110pad_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
pc110pad_dev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y);
pc110pad_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_abs_set_max(pc110pad_dev, ABS_X, 0x1ff);
input_abs_set_max(pc110pad_dev, ABS_Y, 0x0ff);
pc110pad_dev->open = pc110pad_open;
pc110pad_dev->close = pc110pad_close;
err = input_register_device(pc110pad_dev);
if (err)
goto err_free_dev;
return 0;
err_free_dev:
input_free_device(pc110pad_dev);
err_free_irq:
free_irq(pc110pad_irq, NULL);
err_release_region:
release_region(pc110pad_io, 4);
return err;
}
static void __exit pc110pad_exit(void)
{
outb(PC110PAD_OFF, pc110pad_io + 2);
free_irq(pc110pad_irq, NULL);
input_unregister_device(pc110pad_dev);
release_region(pc110pad_io, 4);
}
module_init(pc110pad_init);
module_exit(pc110pad_exit);
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