/* * $Id: sermouse.c,v 1.17 2002/03/13 10:03:43 vojtech Exp $ * *  Copyright (c) 1999-2001 Vojtech Pavlik *//* *  Serial mouse 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/delay.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/interrupt.h>#include <linux/input.h>#include <linux/serio.h>#include <linux/init.h>#define DRIVER_DESC	"Serial mouse driver"MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL");static const char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",					"Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",					"Logitech MZ++ Mouse"};struct sermouse {	struct input_dev *dev;	signed char buf[8];	unsigned char count;	unsigned char type;	unsigned long last;	char phys[32];};/* * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and * applies some prediction to the data, resulting in 96 updates per * second, which is as good as a PS/2 or USB mouse. */static void sermouse_process_msc(struct sermouse *sermouse, signed char data){	struct input_dev *dev = sermouse->dev;	signed char *buf = sermouse->buf;	switch (sermouse->count) {		case 0:			if ((data & 0xf8) != 0x80) return;			input_report_key(dev, BTN_LEFT,   !(data & 4));			input_report_key(dev, BTN_RIGHT,  !(data & 1));			input_report_key(dev, BTN_MIDDLE, !(data & 2));			break;		case 1:		case 3:			input_report_rel(dev, REL_X, data / 2);			input_report_rel(dev, REL_Y, -buf[1]);			buf[0] = data - data / 2;			break;		case 2:		case 4:			input_report_rel(dev, REL_X, buf[0]);			input_report_rel(dev, REL_Y, buf[1] - data);			buf[1] = data / 2;			break;	}	input_sync(dev);	if (++sermouse->count == 5)		sermouse->count = 0;}/* * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and * generates events. With prediction it gets 80 updates/sec, assuming * standard 3-byte packets and 1200 bps. */static void sermouse_process_ms(struct sermouse *sermouse, signed char data){	struct input_dev *dev = sermouse->dev;	signed char *buf = sermouse->buf;	if (data & 0x40) sermouse->count = 0;	switch (sermouse->count) {		case 0:			buf[1] = data;			input_report_key(dev, BTN_LEFT,   (data >> 5) & 1);			input_report_key(dev, BTN_RIGHT,  (data >> 4) & 1);			break;		case 1:			buf[2] = data;			data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));			input_report_rel(dev, REL_X, data / 2);			input_report_rel(dev, REL_Y, buf[4]);			buf[3] = data - data / 2;			break;		case 2:			/* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */			if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))				input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));			buf[0] = buf[1];			data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));			input_report_rel(dev, REL_X, buf[3]);			input_report_rel(dev, REL_Y, data - buf[4]);			buf[4] = data / 2;			break;		case 3:			switch (sermouse->type) {				case SERIO_MS:					 sermouse->type = SERIO_MP;				case SERIO_MP:					if ((data >> 2) & 3) break;	/* M++ Wireless Extension packet. */					input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);					input_report_key(dev, BTN_SIDE,   (data >> 4) & 1);					break;				case SERIO_MZP:				case SERIO_MZPP:					input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);				case SERIO_MZ:					input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);					input_report_rel(dev, REL_WHEEL,  (data & 8) - (data & 7));					break;			}			break;		case 4:		case 6:	/* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */			buf[1] = (data >> 2) & 0x0f;			break;		case 5:		case 7: /* Ignore anything besides MZ++ */			if (sermouse->type != SERIO_MZPP) break;			switch (buf[1]) {				case 1: /* Extra mouse info */					input_report_key(dev, BTN_SIDE, (data >> 4) & 1);					input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);					input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));					break;				default: /* We don't decode anything else yet. */					printk(KERN_WARNING						"sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);					break;			}			break;	}	input_sync(dev);	sermouse->count++;}/* * sermouse_interrupt() handles incoming characters, either gathering them into * packets or passing them to the command routine as command output. */static irqreturn_t sermouse_interrupt(struct serio *serio,		unsigned char data, unsigned int flags){	struct sermouse *sermouse = serio_get_drvdata(serio);	if (time_after(jiffies, sermouse->last + HZ/10)) sermouse->count = 0;	sermouse->last = jiffies;	if (sermouse->type > SERIO_SUN)		sermouse_process_ms(sermouse, data);	else		sermouse_process_msc(sermouse, data);	return IRQ_HANDLED;}/* * sermouse_disconnect() cleans up after we don't want talk * to the mouse anymore. */static void sermouse_disconnect(struct serio *serio){	struct sermouse *sermouse = serio_get_drvdata(serio);	serio_close(serio);	serio_set_drvdata(serio, NULL);	input_unregister_device(sermouse->dev);	kfree(sermouse);}/* * sermouse_connect() is a callback form the serio module when * an unhandled serio port is found. */static int sermouse_connect(struct serio *serio, struct serio_driver *drv){	struct sermouse *sermouse;	struct input_dev *input_dev;	unsigned char c = serio->id.extra;	int err = -ENOMEM;	sermouse = kzalloc(sizeof(struct sermouse), GFP_KERNEL);	input_dev = input_allocate_device();	if (!sermouse || !input_dev)		goto fail;	sermouse->dev = input_dev;	snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);	sermouse->type = serio->id.proto;	input_dev->name = sermouse_protocols[sermouse->type];	input_dev->phys = sermouse->phys;	input_dev->id.bustype = BUS_RS232;	input_dev->id.vendor  = sermouse->type;	input_dev->id.product = c;	input_dev->id.version = 0x0100;	input_dev->cdev.dev = &serio->dev;	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REL);	input_dev->keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT);	input_dev->relbit[0] = BIT(REL_X) | BIT(REL_Y);	input_dev->private = sermouse;	if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);	if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);	if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);	if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);	if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);	serio_set_drvdata(serio, sermouse);	err = serio_open(serio, drv);	if (err)		goto fail;	input_register_device(sermouse->dev);	return 0; fail:	serio_set_drvdata(serio, NULL);	input_free_device(input_dev);	kfree(sermouse);	return err;}static struct serio_device_id sermouse_serio_ids[] = {	{		.type	= SERIO_RS232,		.proto	= SERIO_MSC,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{		.type	= SERIO_RS232,		.proto	= SERIO_SUN,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{		.type	= SERIO_RS232,		.proto	= SERIO_MS,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{		.type	= SERIO_RS232,		.proto	= SERIO_MP,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{		.type	= SERIO_RS232,		.proto	= SERIO_MZ,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{		.type	= SERIO_RS232,		.proto	= SERIO_MZP,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{		.type	= SERIO_RS232,		.proto	= SERIO_MZPP,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{ 0 }};MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);static struct serio_driver sermouse_drv = {	.driver		= {		.name	= "sermouse",	},	.description	= DRIVER_DESC,	.id_table	= sermouse_serio_ids,	.interrupt	= sermouse_interrupt,	.connect	= sermouse_connect,	.disconnect	= sermouse_disconnect,};static int __init sermouse_init(void){	serio_register_driver(&sermouse_drv);	return 0;}static void __exit sermouse_exit(void){	serio_unregister_driver(&sermouse_drv);}module_init(sermouse_init);module_exit(sermouse_exit);