// SPDX-License-Identifier: GPL-2.0-or-later/* ---------------------------------------------------------------------------- * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens * * Copyright (C) 2005 by Stefan Lucke * Copyright (C) 2004 by Daniel Ritz * Copyright (C) by Todd E. Johnson (mtouchusb.c) * * Based upon touchkitusb.c * * Vendor documentation is available at: * http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf  */ #include <linux/kernel.h> #include <linux/input.h>#include <linux/serio.h>#include <linux/libps2.h> #include "psmouse.h"#include "touchkit_ps2.h" #define TOUCHKIT_MAX_XC			0x07ff#define TOUCHKIT_MAX_YC			0x07ff #define TOUCHKIT_CMD			0x0a#define TOUCHKIT_CMD_LENGTH		1 #define TOUCHKIT_CMD_ACTIVE		'A'#define TOUCHKIT_CMD_FIRMWARE_VERSION	'D'#define TOUCHKIT_CMD_CONTROLLER_TYPE	'E' #define TOUCHKIT_SEND_PARMS(s, r, c)	((s) << 12 | (r) << 8 | (c)) #define TOUCHKIT_GET_TOUCHED(packet)	(((packet)[0]) & 0x01)#define TOUCHKIT_GET_X(packet)		(((packet)[1] << 7) | (packet)[2])#define TOUCHKIT_GET_Y(packet)		(((packet)[3] << 7) | (packet)[4]) static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse){	unsigned char *packet = psmouse->packet;	struct input_dev *dev = psmouse->dev; 	if (psmouse->pktcnt != 5)		return PSMOUSE_GOOD_DATA; 	input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));	input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));	input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));	input_sync(dev); 	return PSMOUSE_FULL_PACKET;} int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties){	struct input_dev *dev = psmouse->dev;	unsigned char param[3];	int command; 	param[0] = TOUCHKIT_CMD_LENGTH;	param[1] = TOUCHKIT_CMD_ACTIVE;	command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD); 	if (ps2_command(&psmouse->ps2dev, param, command))		return -ENODEV; 	if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||	    param[2] != TOUCHKIT_CMD_ACTIVE)		return -ENODEV; 	if (set_properties) {		dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);		dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;		dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);		input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);		input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0); 		psmouse->vendor = "eGalax";		psmouse->name = "Touchscreen";		psmouse->protocol_handler = touchkit_ps2_process_byte;		psmouse->pktsize = 5;	} 	return 0;}