/* * Elo serial touchscreen driver * * Copyright (c) 2004 Vojtech Pavlik */ /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published by * the Free Software Foundation. */ /* * This driver can handle serial Elo touchscreens using either the Elo standard * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol. */ #include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/input.h>#include <linux/serio.h>#include <linux/init.h> #define DRIVER_DESC	"Elo serial touchscreen driver" MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL"); /* * Definitions & global arrays. */ #define	ELO_MAX_LENGTH	10 static char *elo_name = "Elo Serial TouchScreen"; /* * Per-touchscreen data. */ struct elo {	struct input_dev dev;	struct serio *serio;	int id;	int idx;	unsigned char csum;	unsigned char data[ELO_MAX_LENGTH];	char phys[32];}; static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs){	struct input_dev *dev = &elo->dev; 	elo->csum += elo->data[elo->idx] = data; 	switch (elo->idx++) { 		case 0:			if (data != 'U') {				elo->idx = 0;				elo->csum = 0;			}			break; 		case 1:			if (data != 'T') {				elo->idx = 0;				elo->csum = 0;			}			break; 		case 9:			if (elo->csum) {				input_regs(dev, regs);				input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);				input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);				input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);				input_report_key(dev, BTN_TOUCH, elo->data[2] & 3);				input_sync(dev);			}			elo->idx = 0;			elo->csum = 0;			break;	}} static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs){	struct input_dev *dev = &elo->dev; 	elo->data[elo->idx] = data; 	switch (elo->idx++) { 		case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;		case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;		case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break; 		case 3:			if (data & 0xc0) {				elo->idx = 0;				break;			} 			input_regs(dev, regs);			input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));			input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f)); 			if (elo->id == 2) {				input_report_key(dev, BTN_TOUCH, 1);				input_sync(dev);				elo->idx = 0;			} 			break; 		case 4:			if (data) {				input_sync(dev);				elo->idx = 0;			}			break; 		case 5:			if ((data & 0xf0) == 0) {				input_report_abs(dev, ABS_PRESSURE, elo->data[5]);				input_report_key(dev, BTN_TOUCH, elo->data[5]);			}			input_sync(dev);			elo->idx = 0;			break;	}} static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs){	struct input_dev *dev = &elo->dev; 	elo->data[elo->idx] = data; 	switch (elo->idx++) { 		case 0:			if ((data & 0x7f) != 0x01)				elo->idx = 0;			break;		case 2:			input_regs(dev, regs);			input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));			input_report_abs(dev, ABS_X, elo->data[1]);			input_report_abs(dev, ABS_Y, elo->data[2]);			input_sync(dev);			elo->idx = 0;			break;	}} static irqreturn_t elo_interrupt(struct serio *serio,		unsigned char data, unsigned int flags, struct pt_regs *regs){	struct elo* elo = serio_get_drvdata(serio); 	switch(elo->id) {		case 0:			elo_process_data_10(elo, data, regs);			break; 		case 1:		case 2:			elo_process_data_6(elo, data, regs);			break; 		case 3:			elo_process_data_3(elo, data, regs);			break;	} 	return IRQ_HANDLED;} /* * elo_disconnect() is the opposite of elo_connect() */ static void elo_disconnect(struct serio *serio){	struct elo* elo = serio_get_drvdata(serio); 	input_unregister_device(&elo->dev);	serio_close(serio);	serio_set_drvdata(serio, NULL);	kfree(elo);} /* * elo_connect() is the routine that is called when someone adds a * new serio device that supports Gunze protocol and registers it as * an input device. */ static int elo_connect(struct serio *serio, struct serio_driver *drv){	struct elo *elo;	int err; 	if (!(elo = kmalloc(sizeof(struct elo), GFP_KERNEL)))		return -ENOMEM; 	memset(elo, 0, sizeof(struct elo)); 	init_input_dev(&elo->dev);	elo->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);	elo->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); 	elo->id = serio->id.id; 	switch (elo->id) { 		case 0: /* 10-byte protocol */			input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);			input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);			input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 255, 0, 0);			break; 		case 1: /* 6-byte protocol */			input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 15, 0, 0); 		case 2: /* 4-byte protocol */			input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);			input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);			break; 		case 3: /* 3-byte protocol */			input_set_abs_params(&elo->dev, ABS_X, 0, 255, 0, 0);			input_set_abs_params(&elo->dev, ABS_Y, 0, 255, 0, 0);			break;	} 	elo->serio = serio; 	sprintf(elo->phys, "%s/input0", serio->phys); 	elo->dev.private = elo;	elo->dev.name = elo_name;	elo->dev.phys = elo->phys;	elo->dev.id.bustype = BUS_RS232;	elo->dev.id.vendor = SERIO_ELO;	elo->dev.id.product = elo->id;	elo->dev.id.version = 0x0100; 	serio_set_drvdata(serio, elo); 	err = serio_open(serio, drv);	if (err) {		serio_set_drvdata(serio, NULL);		kfree(elo);		return err;	} 	input_register_device(&elo->dev); 	printk(KERN_INFO "input: %s on %s\n", elo_name, serio->phys); 	return 0;} /* * The serio driver structure. */ static struct serio_device_id elo_serio_ids[] = {	{		.type	= SERIO_RS232,		.proto	= SERIO_ELO,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{ 0 }}; MODULE_DEVICE_TABLE(serio, elo_serio_ids); static struct serio_driver elo_drv = {	.driver		= {		.name	= "elo",	},	.description	= DRIVER_DESC,	.id_table	= elo_serio_ids,	.interrupt	= elo_interrupt,	.connect	= elo_connect,	.disconnect	= elo_disconnect,}; /* * The functions for inserting/removing us as a module. */ static int __init elo_init(void){	serio_register_driver(&elo_drv);	return 0;} static void __exit elo_exit(void){	serio_unregister_driver(&elo_drv);} module_init(elo_init);module_exit(elo_exit);