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// SPDX-License-Identifier: GPL-2.0-only
/*
* HTC Shift touchscreen driver
*
* Copyright (C) 2008 Pau Oliva Fora <pof@eslack.org>
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/isa.h>
#include <linux/ioport.h>
#include <linux/dmi.h>
MODULE_AUTHOR("Pau Oliva Fora <pau@eslack.org>");
MODULE_DESCRIPTION("HTC Shift touchscreen driver");
MODULE_LICENSE("GPL");
#define HTCPEN_PORT_IRQ_CLEAR 0x068
#define HTCPEN_PORT_INIT 0x06c
#define HTCPEN_PORT_INDEX 0x0250
#define HTCPEN_PORT_DATA 0x0251
#define HTCPEN_IRQ 3
#define DEVICE_ENABLE 0xa2
#define DEVICE_DISABLE 0xa3
#define X_INDEX 3
#define Y_INDEX 5
#define TOUCH_INDEX 0xb
#define LSB_XY_INDEX 0xc
#define X_AXIS_MAX 2040
#define Y_AXIS_MAX 2040
static bool invert_x;
module_param(invert_x, bool, 0644);
MODULE_PARM_DESC(invert_x, "If set, X axis is inverted");
static bool invert_y;
module_param(invert_y, bool, 0644);
MODULE_PARM_DESC(invert_y, "If set, Y axis is inverted");
static irqreturn_t htcpen_interrupt(int irq, void *handle)
{
struct input_dev *htcpen_dev = handle;
unsigned short x, y, xy;
/* 0 = press; 1 = release */
outb_p(TOUCH_INDEX, HTCPEN_PORT_INDEX);
if (inb_p(HTCPEN_PORT_DATA)) {
input_report_key(htcpen_dev, BTN_TOUCH, 0);
} else {
outb_p(X_INDEX, HTCPEN_PORT_INDEX);
x = inb_p(HTCPEN_PORT_DATA);
outb_p(Y_INDEX, HTCPEN_PORT_INDEX);
y = inb_p(HTCPEN_PORT_DATA);
outb_p(LSB_XY_INDEX, HTCPEN_PORT_INDEX);
xy = inb_p(HTCPEN_PORT_DATA);
/* get high resolution value of X and Y using LSB */
x = X_AXIS_MAX - ((x * 8) + ((xy >> 4) & 0xf));
y = (y * 8) + (xy & 0xf);
if (invert_x)
x = X_AXIS_MAX - x;
if (invert_y)
y = Y_AXIS_MAX - y;
if (x != X_AXIS_MAX && x != 0) {
input_report_key(htcpen_dev, BTN_TOUCH, 1);
input_report_abs(htcpen_dev, ABS_X, x);
input_report_abs(htcpen_dev, ABS_Y, y);
}
}
input_sync(htcpen_dev);
inb_p(HTCPEN_PORT_IRQ_CLEAR);
return IRQ_HANDLED;
}
static int htcpen_open(struct input_dev *dev)
{
outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
return 0;
}
static void htcpen_close(struct input_dev *dev)
{
outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
synchronize_irq(HTCPEN_IRQ);
}
static int htcpen_isa_probe(struct device *dev, unsigned int id)
{
struct input_dev *htcpen_dev;
int err = -EBUSY;
if (!request_region(HTCPEN_PORT_IRQ_CLEAR, 1, "htcpen")) {
printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
HTCPEN_PORT_IRQ_CLEAR);
goto request_region1_failed;
}
if (!request_region(HTCPEN_PORT_INIT, 1, "htcpen")) {
printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
HTCPEN_PORT_INIT);
goto request_region2_failed;
}
if (!request_region(HTCPEN_PORT_INDEX, 2, "htcpen")) {
printk(KERN_ERR "htcpen: unable to get IO region 0x%x\n",
HTCPEN_PORT_INDEX);
goto request_region3_failed;
}
htcpen_dev = input_allocate_device();
if (!htcpen_dev) {
printk(KERN_ERR "htcpen: can't allocate device\n");
err = -ENOMEM;
goto input_alloc_failed;
}
htcpen_dev->name = "HTC Shift EC TouchScreen";
htcpen_dev->id.bustype = BUS_ISA;
htcpen_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
htcpen_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(htcpen_dev, ABS_X, 0, X_AXIS_MAX, 0, 0);
input_set_abs_params(htcpen_dev, ABS_Y, 0, Y_AXIS_MAX, 0, 0);
htcpen_dev->open = htcpen_open;
htcpen_dev->close = htcpen_close;
err = request_irq(HTCPEN_IRQ, htcpen_interrupt, 0, "htcpen",
htcpen_dev);
if (err) {
printk(KERN_ERR "htcpen: irq busy\n");
goto request_irq_failed;
}
inb_p(HTCPEN_PORT_IRQ_CLEAR);
err = input_register_device(htcpen_dev);
if (err)
goto input_register_failed;
dev_set_drvdata(dev, htcpen_dev);
return 0;
input_register_failed:
free_irq(HTCPEN_IRQ, htcpen_dev);
request_irq_failed:
input_free_device(htcpen_dev);
input_alloc_failed:
release_region(HTCPEN_PORT_INDEX, 2);
request_region3_failed:
release_region(HTCPEN_PORT_INIT, 1);
request_region2_failed:
release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
request_region1_failed:
return err;
}
static void htcpen_isa_remove(struct device *dev, unsigned int id)
{
struct input_dev *htcpen_dev = dev_get_drvdata(dev);
input_unregister_device(htcpen_dev);
free_irq(HTCPEN_IRQ, htcpen_dev);
release_region(HTCPEN_PORT_INDEX, 2);
release_region(HTCPEN_PORT_INIT, 1);
release_region(HTCPEN_PORT_IRQ_CLEAR, 1);
}
#ifdef CONFIG_PM
static int htcpen_isa_suspend(struct device *dev, unsigned int n,
pm_message_t state)
{
outb_p(DEVICE_DISABLE, HTCPEN_PORT_INIT);
return 0;
}
static int htcpen_isa_resume(struct device *dev, unsigned int n)
{
outb_p(DEVICE_ENABLE, HTCPEN_PORT_INIT);
return 0;
}
#endif
static struct isa_driver htcpen_isa_driver = {
.probe = htcpen_isa_probe,
.remove = htcpen_isa_remove,
#ifdef CONFIG_PM
.suspend = htcpen_isa_suspend,
.resume = htcpen_isa_resume,
#endif
.driver = {
.owner = THIS_MODULE,
.name = "htcpen",
}
};
static const struct dmi_system_id htcshift_dmi_table[] __initconst = {
{
.ident = "Shift",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "High Tech Computer Corp"),
DMI_MATCH(DMI_PRODUCT_NAME, "Shift"),
},
},
{ }
};
MODULE_DEVICE_TABLE(dmi, htcshift_dmi_table);
static int __init htcpen_isa_init(void)
{
if (!dmi_check_system(htcshift_dmi_table))
return -ENODEV;
return isa_register_driver(&htcpen_isa_driver, 1);
}
static void __exit htcpen_isa_exit(void)
{
isa_unregister_driver(&htcpen_isa_driver);
}
module_init(htcpen_isa_init);
module_exit(htcpen_isa_exit);
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