// 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_PMstatic 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);