// SPDX-License-Identifier: GPL-2.0-only#include <linux/input.h>#include <linux/module.h>#include <linux/init.h>#include <linux/interrupt.h>#include <asm/io.h>#include <asm/delay.h>#include <asm/adc.h>#include <mach/hp6xx.h> #define MODNAME "hp680_ts_input" #define HP680_TS_ABS_X_MIN	40#define HP680_TS_ABS_X_MAX	950#define HP680_TS_ABS_Y_MIN	80#define HP680_TS_ABS_Y_MAX	910 #define	PHDR	0xa400012e#define SCPDR	0xa4000136 static void do_softint(struct work_struct *work); static struct input_dev *hp680_ts_dev;static DECLARE_DELAYED_WORK(work, do_softint); static void do_softint(struct work_struct *work){	int absx = 0, absy = 0;	u8 scpdr;	int touched = 0; 	if (__raw_readb(PHDR) & PHDR_TS_PEN_DOWN) {		scpdr = __raw_readb(SCPDR);		scpdr |= SCPDR_TS_SCAN_ENABLE;		scpdr &= ~SCPDR_TS_SCAN_Y;		__raw_writeb(scpdr, SCPDR);		udelay(30); 		absy = adc_single(ADC_CHANNEL_TS_Y); 		scpdr = __raw_readb(SCPDR);		scpdr |= SCPDR_TS_SCAN_Y;		scpdr &= ~SCPDR_TS_SCAN_X;		__raw_writeb(scpdr, SCPDR);		udelay(30); 		absx = adc_single(ADC_CHANNEL_TS_X); 		scpdr = __raw_readb(SCPDR);		scpdr |= SCPDR_TS_SCAN_X;		scpdr &= ~SCPDR_TS_SCAN_ENABLE;		__raw_writeb(scpdr, SCPDR);		udelay(100);		touched = __raw_readb(PHDR) & PHDR_TS_PEN_DOWN;	} 	if (touched) {		input_report_key(hp680_ts_dev, BTN_TOUCH, 1);		input_report_abs(hp680_ts_dev, ABS_X, absx);		input_report_abs(hp680_ts_dev, ABS_Y, absy);	} else {		input_report_key(hp680_ts_dev, BTN_TOUCH, 0);	} 	input_sync(hp680_ts_dev);	enable_irq(HP680_TS_IRQ);} static irqreturn_t hp680_ts_interrupt(int irq, void *dev){	disable_irq_nosync(irq);	schedule_delayed_work(&work, HZ / 20); 	return IRQ_HANDLED;} static int __init hp680_ts_init(void){	int err; 	hp680_ts_dev = input_allocate_device();	if (!hp680_ts_dev)		return -ENOMEM; 	hp680_ts_dev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);	hp680_ts_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 	input_set_abs_params(hp680_ts_dev, ABS_X,		HP680_TS_ABS_X_MIN, HP680_TS_ABS_X_MAX, 0, 0);	input_set_abs_params(hp680_ts_dev, ABS_Y,		HP680_TS_ABS_Y_MIN, HP680_TS_ABS_Y_MAX, 0, 0); 	hp680_ts_dev->name = "HP Jornada touchscreen";	hp680_ts_dev->phys = "hp680_ts/input0"; 	if (request_irq(HP680_TS_IRQ, hp680_ts_interrupt,			0, MODNAME, NULL) < 0) {		printk(KERN_ERR "hp680_touchscreen.c: Can't allocate irq %d\n",		       HP680_TS_IRQ);		err = -EBUSY;		goto fail1;	} 	err = input_register_device(hp680_ts_dev);	if (err)		goto fail2; 	return 0;  fail2:	free_irq(HP680_TS_IRQ, NULL);	cancel_delayed_work_sync(&work); fail1:	input_free_device(hp680_ts_dev);	return err;} static void __exit hp680_ts_exit(void){	free_irq(HP680_TS_IRQ, NULL);	cancel_delayed_work_sync(&work);	input_unregister_device(hp680_ts_dev);} module_init(hp680_ts_init);module_exit(hp680_ts_exit); MODULE_AUTHOR("Andriy Skulysh, askulysh@image.kiev.ua");MODULE_DESCRIPTION("HP Jornada 680 touchscreen driver");MODULE_LICENSE("GPL");