/* * $Id: gunze.c,v 1.12 2001/09/25 10:12:07 vojtech Exp $ * *  Copyright (c) 2000-2001 Vojtech Pavlik *//* * Gunze AHL-51S touchscreen driver for Linux *//* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Should you need to contact me, the author, you can do so either by * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic */#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	"Gunze AHL-51S touchscreen driver"MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL");/* * Definitions & global arrays. */#define	GUNZE_MAX_LENGTH	10static char *gunze_name = "Gunze AHL-51S TouchScreen";/* * Per-touchscreen data. */struct gunze {	struct input_dev dev;	struct serio *serio;	int idx;	unsigned char data[GUNZE_MAX_LENGTH];	char phys[32];};static void gunze_process_packet(struct gunze* gunze, struct pt_regs *regs){	struct input_dev *dev = &gunze->dev;	if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||		(gunze->data[0] != 'T' && gunze->data[0] != 'R')) {		printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);		return;	}	input_regs(dev, regs);	input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));	input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));	input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');	input_sync(dev);}static irqreturn_t gunze_interrupt(struct serio *serio,		unsigned char data, unsigned int flags, struct pt_regs *regs){	struct gunze* gunze = serio_get_drvdata(serio);	if (data == '\r') {		gunze_process_packet(gunze, regs);		gunze->idx = 0;	} else {		if (gunze->idx < GUNZE_MAX_LENGTH)			gunze->data[gunze->idx++] = data;	}	return IRQ_HANDLED;}/* * gunze_disconnect() is the opposite of gunze_connect() */static void gunze_disconnect(struct serio *serio){	struct gunze* gunze = serio_get_drvdata(serio);	input_unregister_device(&gunze->dev);	serio_close(serio);	serio_set_drvdata(serio, NULL);	kfree(gunze);}/* * gunze_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 gunze_connect(struct serio *serio, struct serio_driver *drv){	struct gunze *gunze;	int err;	if (!(gunze = kmalloc(sizeof(struct gunze), GFP_KERNEL)))		return -ENOMEM;	memset(gunze, 0, sizeof(struct gunze));	init_input_dev(&gunze->dev);	gunze->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);	gunze->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);	input_set_abs_params(&gunze->dev, ABS_X, 24, 1000, 0, 0);	input_set_abs_params(&gunze->dev, ABS_Y, 24, 1000, 0, 0);	gunze->serio = serio;	sprintf(gunze->phys, "%s/input0", serio->phys);	gunze->dev.private = gunze;	gunze->dev.name = gunze_name;	gunze->dev.phys = gunze->phys;	gunze->dev.id.bustype = BUS_RS232;	gunze->dev.id.vendor = SERIO_GUNZE;	gunze->dev.id.product = 0x0051;	gunze->dev.id.version = 0x0100;	serio_set_drvdata(serio, gunze);	err = serio_open(serio, drv);	if (err) {		serio_set_drvdata(serio, NULL);		kfree(gunze);		return err;	}	input_register_device(&gunze->dev);	printk(KERN_INFO "input: %s on %s\n", gunze_name, serio->phys);	return 0;}/* * The serio driver structure. */static struct serio_device_id gunze_serio_ids[] = {	{		.type	= SERIO_RS232,		.proto	= SERIO_GUNZE,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{ 0 }};MODULE_DEVICE_TABLE(serio, gunze_serio_ids);static struct serio_driver gunze_drv = {	.driver		= {		.name	= "gunze",	},	.description	= DRIVER_DESC,	.id_table	= gunze_serio_ids,	.interrupt	= gunze_interrupt,	.connect	= gunze_connect,	.disconnect	= gunze_disconnect,};/* * The functions for inserting/removing us as a module. */static int __init gunze_init(void){	serio_register_driver(&gunze_drv);	return 0;}static void __exit gunze_exit(void){	serio_unregister_driver(&gunze_drv);}module_init(gunze_init);module_exit(gunze_exit);