// SPDX-License-Identifier: GPL-2.0-or-later/* *  Copyright (c) 1999-2001 Vojtech Pavlik */ /* * Logitech WingMan Warrior joystick driver for Linux */ #include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/input.h>#include <linux/serio.h> #define DRIVER_DESC	"Logitech WingMan Warrior joystick driver" MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");MODULE_DESCRIPTION(DRIVER_DESC);MODULE_LICENSE("GPL"); /* * Constants. */ #define WARRIOR_MAX_LENGTH	16static char warrior_lengths[] = { 0, 4, 12, 3, 4, 4, 0, 0 }; /* * Per-Warrior data. */ struct warrior {	struct input_dev *dev;	int idx, len;	unsigned char data[WARRIOR_MAX_LENGTH];	char phys[32];}; /* * warrior_process_packet() decodes packets the driver receives from the * Warrior. It updates the data accordingly. */ static void warrior_process_packet(struct warrior *warrior){	struct input_dev *dev = warrior->dev;	unsigned char *data = warrior->data; 	if (!warrior->idx) return; 	switch ((data[0] >> 4) & 7) {		case 1:					/* Button data */			input_report_key(dev, BTN_TRIGGER,  data[3]       & 1);			input_report_key(dev, BTN_THUMB,   (data[3] >> 1) & 1);			input_report_key(dev, BTN_TOP,     (data[3] >> 2) & 1);			input_report_key(dev, BTN_TOP2,    (data[3] >> 3) & 1);			break;		case 3:					/* XY-axis info->data */			input_report_abs(dev, ABS_X, ((data[0] & 8) << 5) - (data[2] | ((data[0] & 4) << 5)));			input_report_abs(dev, ABS_Y, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));			break;		case 5:					/* Throttle, spinner, hat info->data */			input_report_abs(dev, ABS_THROTTLE, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));			input_report_abs(dev, ABS_HAT0X, (data[3] & 2 ? 1 : 0) - (data[3] & 1 ? 1 : 0));			input_report_abs(dev, ABS_HAT0Y, (data[3] & 8 ? 1 : 0) - (data[3] & 4 ? 1 : 0));			input_report_rel(dev, REL_DIAL,  (data[2] | ((data[0] & 4) << 5)) - ((data[0] & 8) << 5));			break;	}	input_sync(dev);} /* * warrior_interrupt() is called by the low level driver when characters * are ready for us. We then buffer them for further processing, or call the * packet processing routine. */ static irqreturn_t warrior_interrupt(struct serio *serio,		unsigned char data, unsigned int flags){	struct warrior *warrior = serio_get_drvdata(serio); 	if (data & 0x80) {		if (warrior->idx) warrior_process_packet(warrior);		warrior->idx = 0;		warrior->len = warrior_lengths[(data >> 4) & 7];	} 	if (warrior->idx < warrior->len)		warrior->data[warrior->idx++] = data; 	if (warrior->idx == warrior->len) {		if (warrior->idx) warrior_process_packet(warrior);		warrior->idx = 0;		warrior->len = 0;	}	return IRQ_HANDLED;} /* * warrior_disconnect() is the opposite of warrior_connect() */ static void warrior_disconnect(struct serio *serio){	struct warrior *warrior = serio_get_drvdata(serio); 	serio_close(serio);	serio_set_drvdata(serio, NULL);	input_unregister_device(warrior->dev);	kfree(warrior);} /* * warrior_connect() is the routine that is called when someone adds a * new serio device. It looks for the Warrior, and if found, registers * it as an input device. */ static int warrior_connect(struct serio *serio, struct serio_driver *drv){	struct warrior *warrior;	struct input_dev *input_dev;	int err = -ENOMEM; 	warrior = kzalloc_obj(*warrior);	input_dev = input_allocate_device();	if (!warrior || !input_dev)		goto fail1; 	warrior->dev = input_dev;	snprintf(warrior->phys, sizeof(warrior->phys), "%s/input0", serio->phys); 	input_dev->name = "Logitech WingMan Warrior";	input_dev->phys = warrior->phys;	input_dev->id.bustype = BUS_RS232;	input_dev->id.vendor = SERIO_WARRIOR;	input_dev->id.product = 0x0001;	input_dev->id.version = 0x0100;	input_dev->dev.parent = &serio->dev; 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL) |		BIT_MASK(EV_ABS);	input_dev->keybit[BIT_WORD(BTN_TRIGGER)] = BIT_MASK(BTN_TRIGGER) |		BIT_MASK(BTN_THUMB) | BIT_MASK(BTN_TOP) | BIT_MASK(BTN_TOP2);	input_dev->relbit[0] = BIT_MASK(REL_DIAL);	input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 8);	input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 8);	input_set_abs_params(input_dev, ABS_THROTTLE, -112, 112, 0, 0);	input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);	input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0); 	serio_set_drvdata(serio, warrior); 	err = serio_open(serio, drv);	if (err)		goto fail2; 	err = input_register_device(warrior->dev);	if (err)		goto fail3; 	return 0;  fail3:	serio_close(serio); fail2:	serio_set_drvdata(serio, NULL); fail1:	input_free_device(input_dev);	kfree(warrior);	return err;} /* * The serio driver structure. */ static const struct serio_device_id warrior_serio_ids[] = {	{		.type	= SERIO_RS232,		.proto	= SERIO_WARRIOR,		.id	= SERIO_ANY,		.extra	= SERIO_ANY,	},	{ 0 }}; MODULE_DEVICE_TABLE(serio, warrior_serio_ids); static struct serio_driver warrior_drv = {	.driver		= {		.name	= "warrior",	},	.description	= DRIVER_DESC,	.id_table	= warrior_serio_ids,	.interrupt	= warrior_interrupt,	.connect	= warrior_connect,	.disconnect	= warrior_disconnect,}; module_serio_driver(warrior_drv);