drivers/input/joystick/db9.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Copyright (c) 1999-2001 Vojtech Pavlik
  *
  *  Based on the work of:
  *	Andree Borrmann		Mats Sjövall
  */

 /*
  * Atari, Amstrad, Commodore, Amiga, Sega, etc. joystick driver for Linux
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/parport.h>
 #include <linux/input.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>

 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("Atari, Amstrad, Commodore, Amiga, Sega, etc. joystick driver");
 MODULE_LICENSE("GPL");

 struct db9_config {
 	int args[2];
 	unsigned int nargs;
 };

 #define DB9_MAX_PORTS		3
 static struct db9_config db9_cfg[DB9_MAX_PORTS];

 module_param_array_named(dev, db9_cfg[0].args, int, &db9_cfg[0].nargs, 0);
 MODULE_PARM_DESC(dev, "Describes first attached device (<parport#>,<type>)");
 module_param_array_named(dev2, db9_cfg[1].args, int, &db9_cfg[1].nargs, 0);
 MODULE_PARM_DESC(dev2, "Describes second attached device (<parport#>,<type>)");
 module_param_array_named(dev3, db9_cfg[2].args, int, &db9_cfg[2].nargs, 0);
 MODULE_PARM_DESC(dev3, "Describes third attached device (<parport#>,<type>)");

 #define DB9_ARG_PARPORT		0
 #define DB9_ARG_MODE		1

 #define DB9_MULTI_STICK		0x01
 #define DB9_MULTI2_STICK	0x02
 #define DB9_GENESIS_PAD		0x03
 #define DB9_GENESIS5_PAD	0x05
 #define DB9_GENESIS6_PAD	0x06
 #define DB9_SATURN_PAD		0x07
 #define DB9_MULTI_0802		0x08
 #define DB9_MULTI_0802_2	0x09
 #define DB9_CD32_PAD		0x0A
 #define DB9_SATURN_DPP		0x0B
 #define DB9_SATURN_DPP_2	0x0C
 #define DB9_MAX_PAD		0x0D

 #define DB9_UP			0x01
 #define DB9_DOWN		0x02
 #define DB9_LEFT		0x04
 #define DB9_RIGHT		0x08
 #define DB9_FIRE1		0x10
 #define DB9_FIRE2		0x20
 #define DB9_FIRE3		0x40
 #define DB9_FIRE4		0x80

 #define DB9_NORMAL		0x0a
 #define DB9_NOSELECT		0x08

 #define DB9_GENESIS6_DELAY	14
 #define DB9_REFRESH_TIME	HZ/100

 #define DB9_MAX_DEVICES		2

 struct db9_mode_data {
 	const char *name;
 	const short *buttons;
 	int n_buttons;
 	int n_pads;
 	int n_axis;
 	int bidirectional;
 	int reverse;
 };

 struct db9 {
 	struct input_dev *dev[DB9_MAX_DEVICES];
 	struct timer_list timer;
 	struct pardevice *pd;
 	int mode;
 	int used;
 	int parportno;
 	struct mutex mutex;
 	char phys[DB9_MAX_DEVICES][32];
 };

 static struct db9 *db9_base[3];

 static const short db9_multi_btn[] = { BTN_TRIGGER, BTN_THUMB };
 static const short db9_genesis_btn[] = { BTN_START, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_MODE };
 static const short db9_cd32_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START };
 static const short db9_abs[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_RZ, ABS_Z, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y };

 static const struct db9_mode_data db9_modes[] = {
 	{ NULL,					 NULL,		  0,  0,  0,  0,  0 },
 	{ "Multisystem joystick",		 db9_multi_btn,	  1,  1,  2,  1,  1 },
 	{ "Multisystem joystick (2 fire)",	 db9_multi_btn,	  2,  1,  2,  1,  1 },
 	{ "Genesis pad",			 db9_genesis_btn, 4,  1,  2,  1,  1 },
 	{ NULL,					 NULL,		  0,  0,  0,  0,  0 },
 	{ "Genesis 5 pad",			 db9_genesis_btn, 6,  1,  2,  1,  1 },
 	{ "Genesis 6 pad",			 db9_genesis_btn, 8,  1,  2,  1,  1 },
 	{ "Saturn pad",				 db9_cd32_btn,	  9,  6,  7,  0,  1 },
 	{ "Multisystem (0.8.0.2) joystick",	 db9_multi_btn,	  1,  1,  2,  1,  1 },
 	{ "Multisystem (0.8.0.2-dual) joystick", db9_multi_btn,	  1,  2,  2,  1,  1 },
 	{ "Amiga CD-32 pad",			 db9_cd32_btn,	  7,  1,  2,  1,  1 },
 	{ "Saturn dpp",				 db9_cd32_btn,	  9,  6,  7,  0,  0 },
 	{ "Saturn dpp dual",			 db9_cd32_btn,	  9,  12, 7,  0,  0 },
 };

 /*
  * Saturn controllers
  */
 #define DB9_SATURN_DELAY 300
 static const int db9_saturn_byte[] = { 1, 1, 1, 2, 2, 2, 2, 2, 1 };
 static const unsigned char db9_saturn_mask[] = { 0x04, 0x01, 0x02, 0x40, 0x20, 0x10, 0x08, 0x80, 0x08 };

 /*
  * db9_saturn_write_sub() writes 2 bit data.
  */
 static void db9_saturn_write_sub(struct parport *port, int type, unsigned char data, int powered, int pwr_sub)
 {
 	unsigned char c;

 	switch (type) {
 	case 1: /* DPP1 */
 		c = 0x80 | 0x30 | (powered ? 0x08 : 0) | (pwr_sub ? 0x04 : 0) | data;
 		parport_write_data(port, c);
 		break;
 	case 2: /* DPP2 */
 		c = 0x40 | data << 4 | (powered ? 0x08 : 0) | (pwr_sub ? 0x04 : 0) | 0x03;
 		parport_write_data(port, c);
 		break;
 	case 0:	/* DB9 */
 		c = ((((data & 2) ? 2 : 0) | ((data & 1) ? 4 : 0)) ^ 0x02) | !powered;
 		parport_write_control(port, c);
 		break;
 	}
 }

 /*
  * gc_saturn_read_sub() reads 4 bit data.
  */
 static unsigned char db9_saturn_read_sub(struct parport *port, int type)
 {
 	unsigned char data;

 	if (type) {
 		/* DPP */
 		data = parport_read_status(port) ^ 0x80;
 		return (data & 0x80 ? 1 : 0) | (data & 0x40 ? 2 : 0)
 		     | (data & 0x20 ? 4 : 0) | (data & 0x10 ? 8 : 0);
 	} else {
 		/* DB9 */
 		data = parport_read_data(port) & 0x0f;
 		return (data & 0x8 ? 1 : 0) | (data & 0x4 ? 2 : 0)
 		     | (data & 0x2 ? 4 : 0) | (data & 0x1 ? 8 : 0);
 	}
 }

 /*
  * db9_saturn_read_analog() sends clock and reads 8 bit data.
  */
 static unsigned char db9_saturn_read_analog(struct parport *port, int type, int powered)
 {
 	unsigned char data;

 	db9_saturn_write_sub(port, type, 0, powered, 0);
 	udelay(DB9_SATURN_DELAY);
 	data = db9_saturn_read_sub(port, type) << 4;
 	db9_saturn_write_sub(port, type, 2, powered, 0);
 	udelay(DB9_SATURN_DELAY);
 	data |= db9_saturn_read_sub(port, type);
 	return data;
 }

 /*
  * db9_saturn_read_packet() reads whole saturn packet at connector
  * and returns device identifier code.
  */
 static unsigned char db9_saturn_read_packet(struct parport *port, unsigned char *data, int type, int powered)
 {
 	int i, j;
 	unsigned char tmp;

 	db9_saturn_write_sub(port, type, 3, powered, 0);
 	data[0] = db9_saturn_read_sub(port, type);
 	switch (data[0] & 0x0f) {
 	case 0xf:
 		/* 1111  no pad */
 		return data[0] = 0xff;
 	case 0x4: case 0x4 | 0x8:
 		/* ?100 : digital controller */
 		db9_saturn_write_sub(port, type, 0, powered, 1);
 		data[2] = db9_saturn_read_sub(port, type) << 4;
 		db9_saturn_write_sub(port, type, 2, powered, 1);
 		data[1] = db9_saturn_read_sub(port, type) << 4;
 		db9_saturn_write_sub(port, type, 1, powered, 1);
 		data[1] |= db9_saturn_read_sub(port, type);
 		db9_saturn_write_sub(port, type, 3, powered, 1);
 		/* data[2] |= db9_saturn_read_sub(port, type); */
 		data[2] |= data[0];
 		return data[0] = 0x02;
 	case 0x1:
 		/* 0001 : analog controller or multitap */
 		db9_saturn_write_sub(port, type, 2, powered, 0);
 		udelay(DB9_SATURN_DELAY);
 		data[0] = db9_saturn_read_analog(port, type, powered);
 		if (data[0] != 0x41) {
 			/* read analog controller */
 			for (i = 0; i < (data[0] & 0x0f); i++)
 				data[i + 1] = db9_saturn_read_analog(port, type, powered);
 			db9_saturn_write_sub(port, type, 3, powered, 0);
 			return data[0];
 		} else {
 			/* read multitap */
 			if (db9_saturn_read_analog(port, type, powered) != 0x60)
 				return data[0] = 0xff;
 			for (i = 0; i < 60; i += 10) {
 				data[i] = db9_saturn_read_analog(port, type, powered);
 				if (data[i] != 0xff)
 					/* read each pad */
 					for (j = 0; j < (data[i] & 0x0f); j++)
 						data[i + j + 1] = db9_saturn_read_analog(port, type, powered);
 			}
 			db9_saturn_write_sub(port, type, 3, powered, 0);
 			return 0x41;
 		}
 	case 0x0:
 		/* 0000 : mouse */
 		db9_saturn_write_sub(port, type, 2, powered, 0);
 		udelay(DB9_SATURN_DELAY);
 		tmp = db9_saturn_read_analog(port, type, powered);
 		if (tmp == 0xff) {
 			for (i = 0; i < 3; i++)
 				data[i + 1] = db9_saturn_read_analog(port, type, powered);
 			db9_saturn_write_sub(port, type, 3, powered, 0);
 			return data[0] = 0xe3;
 		}
 		fallthrough;
 	default:
 		return data[0];
 	}
 }

 /*
  * db9_saturn_report() analyzes packet and reports.
  */
 static int db9_saturn_report(unsigned char id, unsigned char data[60], struct input_dev *devs[], int n, int max_pads)
 {
 	struct input_dev *dev;
 	int tmp, i, j;

 	tmp = (id == 0x41) ? 60 : 10;
 	for (j = 0; j < tmp && n < max_pads; j += 10, n++) {
 		dev = devs[n];
 		switch (data[j]) {
 		case 0x16: /* multi controller (analog 4 axis) */
 			input_report_abs(dev, db9_abs[5], data[j + 6]);
 			fallthrough;
 		case 0x15: /* mission stick (analog 3 axis) */
 			input_report_abs(dev, db9_abs[3], data[j + 4]);
 			input_report_abs(dev, db9_abs[4], data[j + 5]);
 			fallthrough;
 		case 0x13: /* racing controller (analog 1 axis) */
 			input_report_abs(dev, db9_abs[2], data[j + 3]);
 			fallthrough;
 		case 0x34: /* saturn keyboard (udlr ZXC ASD QE Esc) */
 		case 0x02: /* digital pad (digital 2 axis + buttons) */
 			input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
 			input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
 			for (i = 0; i < 9; i++)
 				input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
 			break;
 		case 0x19: /* mission stick x2 (analog 6 axis + buttons) */
 			input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
 			input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
 			for (i = 0; i < 9; i++)
 				input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
 			input_report_abs(dev, db9_abs[2], data[j + 3]);
 			input_report_abs(dev, db9_abs[3], data[j + 4]);
 			input_report_abs(dev, db9_abs[4], data[j + 5]);
 			/*
 			input_report_abs(dev, db9_abs[8], (data[j + 6] & 128 ? 0 : 1) - (data[j + 6] & 64 ? 0 : 1));
 			input_report_abs(dev, db9_abs[9], (data[j + 6] & 32 ? 0 : 1) - (data[j + 6] & 16 ? 0 : 1));
 			*/
 			input_report_abs(dev, db9_abs[6], data[j + 7]);
 			input_report_abs(dev, db9_abs[7], data[j + 8]);
 			input_report_abs(dev, db9_abs[5], data[j + 9]);
 			break;
 		case 0xd3: /* sankyo ff (analog 1 axis + stop btn) */
 			input_report_key(dev, BTN_A, data[j + 3] & 0x80);
 			input_report_abs(dev, db9_abs[2], data[j + 3] & 0x7f);
 			break;
 		case 0xe3: /* shuttle mouse (analog 2 axis + buttons. signed value) */
 			input_report_key(dev, BTN_START, data[j + 1] & 0x08);
 			input_report_key(dev, BTN_A, data[j + 1] & 0x04);
 			input_report_key(dev, BTN_C, data[j + 1] & 0x02);
 			input_report_key(dev, BTN_B, data[j + 1] & 0x01);
 			input_report_abs(dev, db9_abs[2], data[j + 2] ^ 0x80);
 			input_report_abs(dev, db9_abs[3], (0xff-(data[j + 3] ^ 0x80))+1); /* */
 			break;
 		case 0xff:
 		default: /* no pad */
 			input_report_abs(dev, db9_abs[0], 0);
 			input_report_abs(dev, db9_abs[1], 0);
 			for (i = 0; i < 9; i++)
 				input_report_key(dev, db9_cd32_btn[i], 0);
 			break;
 		}
 	}
 	return n;
 }

 static int db9_saturn(int mode, struct parport *port, struct input_dev *devs[])
 {
 	unsigned char id, data[60];
 	int type, n, max_pads;
 	int tmp, i;

 	switch (mode) {
 	case DB9_SATURN_PAD:
 		type = 0;
 		n = 1;
 		break;
 	case DB9_SATURN_DPP:
 		type = 1;
 		n = 1;
 		break;
 	case DB9_SATURN_DPP_2:
 		type = 1;
 		n = 2;
 		break;
 	default:
 		return -1;
 	}
 	max_pads = min(db9_modes[mode].n_pads, DB9_MAX_DEVICES);
 	for (tmp = 0, i = 0; i < n; i++) {
 		id = db9_saturn_read_packet(port, data, type + i, 1);
 		tmp = db9_saturn_report(id, data, devs, tmp, max_pads);
 	}
 	return 0;
 }

 static void db9_timer(struct timer_list *t)
 {
 	struct db9 *db9 = from_timer(db9, t, timer);
 	struct parport *port = db9->pd->port;
 	struct input_dev *dev = db9->dev[0];
 	struct input_dev *dev2 = db9->dev[1];
 	int data, i;

 	switch (db9->mode) {
 		case DB9_MULTI_0802_2:

 			data = parport_read_data(port) >> 3;

 			input_report_abs(dev2, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev2, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev2, BTN_TRIGGER, ~data & DB9_FIRE1);
 			fallthrough;

 		case DB9_MULTI_0802:

 			data = parport_read_status(port) >> 3;

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev, BTN_TRIGGER, data & DB9_FIRE1);
 			break;

 		case DB9_MULTI_STICK:

 			data = parport_read_data(port);

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
 			break;

 		case DB9_MULTI2_STICK:

 			data = parport_read_data(port);

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_THUMB,   ~data & DB9_FIRE2);
 			break;

 		case DB9_GENESIS_PAD:

 			parport_write_control(port, DB9_NOSELECT);
 			data = parport_read_data(port);

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

 			parport_write_control(port, DB9_NORMAL);
 			data = parport_read_data(port);

 			input_report_key(dev, BTN_A,     ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_START, ~data & DB9_FIRE2);
 			break;

 		case DB9_GENESIS5_PAD:

 			parport_write_control(port, DB9_NOSELECT);
 			data = parport_read_data(port);

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

 			parport_write_control(port, DB9_NORMAL);
 			data = parport_read_data(port);

 			input_report_key(dev, BTN_A,     ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_X,     ~data & DB9_FIRE2);
 			input_report_key(dev, BTN_Y,     ~data & DB9_LEFT);
 			input_report_key(dev, BTN_START, ~data & DB9_RIGHT);
 			break;

 		case DB9_GENESIS6_PAD:

 			parport_write_control(port, DB9_NOSELECT); /* 1 */
 			udelay(DB9_GENESIS6_DELAY);
 			data = parport_read_data(port);

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
 			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

 			parport_write_control(port, DB9_NORMAL);
 			udelay(DB9_GENESIS6_DELAY);
 			data = parport_read_data(port);

 			input_report_key(dev, BTN_A, ~data & DB9_FIRE1);
 			input_report_key(dev, BTN_START, ~data & DB9_FIRE2);

 			parport_write_control(port, DB9_NOSELECT); /* 2 */
 			udelay(DB9_GENESIS6_DELAY);
 			parport_write_control(port, DB9_NORMAL);
 			udelay(DB9_GENESIS6_DELAY);
 			parport_write_control(port, DB9_NOSELECT); /* 3 */
 			udelay(DB9_GENESIS6_DELAY);
 			data=parport_read_data(port);

 			input_report_key(dev, BTN_X,    ~data & DB9_LEFT);
 			input_report_key(dev, BTN_Y,    ~data & DB9_DOWN);
 			input_report_key(dev, BTN_Z,    ~data & DB9_UP);
 			input_report_key(dev, BTN_MODE, ~data & DB9_RIGHT);

 			parport_write_control(port, DB9_NORMAL);
 			udelay(DB9_GENESIS6_DELAY);
 			parport_write_control(port, DB9_NOSELECT); /* 4 */
 			udelay(DB9_GENESIS6_DELAY);
 			parport_write_control(port, DB9_NORMAL);
 			break;

 		case DB9_SATURN_PAD:
 		case DB9_SATURN_DPP:
 		case DB9_SATURN_DPP_2:

 			db9_saturn(db9->mode, port, db9->dev);
 			break;

 		case DB9_CD32_PAD:

 			data = parport_read_data(port);

 			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
 			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));

 			parport_write_control(port, 0x0a);

 			for (i = 0; i < 7; i++) {
 				data = parport_read_data(port);
 				parport_write_control(port, 0x02);
 				parport_write_control(port, 0x0a);
 				input_report_key(dev, db9_cd32_btn[i], ~data & DB9_FIRE2);
 			}

 			parport_write_control(port, 0x00);
 			break;
 		}

 	input_sync(dev);

 	mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
 }

 static int db9_open(struct input_dev *dev)
 {
 	struct db9 *db9 = input_get_drvdata(dev);
 	struct parport *port = db9->pd->port;

 	scoped_guard(mutex_intr, &db9->mutex) {
 		if (!db9->used++) {
 			parport_claim(db9->pd);
 			parport_write_data(port, 0xff);
 			if (db9_modes[db9->mode].reverse) {
 				parport_data_reverse(port);
 				parport_write_control(port, DB9_NORMAL);
 			}
 			mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
 		}

 		return 0;
 	}

 	return -EINTR;
 }

 static void db9_close(struct input_dev *dev)
 {
 	struct db9 *db9 = input_get_drvdata(dev);
 	struct parport *port = db9->pd->port;

 	guard(mutex)(&db9->mutex);

 	if (!--db9->used) {
 		del_timer_sync(&db9->timer);
 		parport_write_control(port, 0x00);
 		parport_data_forward(port);
 		parport_release(db9->pd);
 	}
 }

 static void db9_attach(struct parport *pp)
 {
 	struct db9 *db9;
 	const struct db9_mode_data *db9_mode;
 	struct pardevice *pd;
 	struct input_dev *input_dev;
 	int i, j, port_idx;
 	int mode;
 	struct pardev_cb db9_parport_cb;

 	for (port_idx = 0; port_idx < DB9_MAX_PORTS; port_idx++) {
 		if (db9_cfg[port_idx].nargs == 0 ||
 		    db9_cfg[port_idx].args[DB9_ARG_PARPORT] < 0)
 			continue;

 		if (db9_cfg[port_idx].args[DB9_ARG_PARPORT] == pp->number)
 			break;
 	}

 	if (port_idx == DB9_MAX_PORTS) {
 		pr_debug("Not using parport%d.\n", pp->number);
 		return;
 	}

 	mode = db9_cfg[port_idx].args[DB9_ARG_MODE];

 	if (mode < 1 || mode >= DB9_MAX_PAD || !db9_modes[mode].n_buttons) {
 		printk(KERN_ERR "db9.c: Bad device type %d\n", mode);
 		return;
 	}

 	db9_mode = &db9_modes[mode];

 	if (db9_mode->bidirectional && !(pp->modes & PARPORT_MODE_TRISTATE)) {
 		printk(KERN_ERR "db9.c: specified parport is not bidirectional\n");
 		return;
 	}

 	memset(&db9_parport_cb, 0, sizeof(db9_parport_cb));
 	db9_parport_cb.flags = PARPORT_FLAG_EXCL;

 	pd = parport_register_dev_model(pp, "db9", &db9_parport_cb, port_idx);
 	if (!pd) {
 		printk(KERN_ERR "db9.c: parport busy already - lp.o loaded?\n");
 		return;
 	}

 	db9 = kzalloc(sizeof(*db9), GFP_KERNEL);
 	if (!db9)
 		goto err_unreg_pardev;

 	mutex_init(&db9->mutex);
 	db9->pd = pd;
 	db9->mode = mode;
 	db9->parportno = pp->number;
 	timer_setup(&db9->timer, db9_timer, 0);

 	for (i = 0; i < (min(db9_mode->n_pads, DB9_MAX_DEVICES)); i++) {

 		db9->dev[i] = input_dev = input_allocate_device();
 		if (!input_dev) {
 			printk(KERN_ERR "db9.c: Not enough memory for input device\n");
 			goto err_unreg_devs;
 		}

 		snprintf(db9->phys[i], sizeof(db9->phys[i]),
 			 "%s/input%d", db9->pd->port->name, i);

 		input_dev->name = db9_mode->name;
 		input_dev->phys = db9->phys[i];
 		input_dev->id.bustype = BUS_PARPORT;
 		input_dev->id.vendor = 0x0002;
 		input_dev->id.product = mode;
 		input_dev->id.version = 0x0100;

 		input_set_drvdata(input_dev, db9);

 		input_dev->open = db9_open;
 		input_dev->close = db9_close;

 		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 		for (j = 0; j < db9_mode->n_buttons; j++)
 			set_bit(db9_mode->buttons[j], input_dev->keybit);
 		for (j = 0; j < db9_mode->n_axis; j++) {
 			if (j < 2)
 				input_set_abs_params(input_dev, db9_abs[j], -1, 1, 0, 0);
 			else
 				input_set_abs_params(input_dev, db9_abs[j], 1, 255, 0, 0);
 		}

 		if (input_register_device(input_dev))
 			goto err_free_dev;
 	}

 	db9_base[port_idx] = db9;
 	return;

  err_free_dev:
 	input_free_device(db9->dev[i]);
  err_unreg_devs:
 	while (--i >= 0)
 		input_unregister_device(db9->dev[i]);
 	kfree(db9);
  err_unreg_pardev:
 	parport_unregister_device(pd);
 }

 static void db9_detach(struct parport *port)
 {
 	int i;
 	struct db9 *db9;

 	for (i = 0; i < DB9_MAX_PORTS; i++) {
 		if (db9_base[i] && db9_base[i]->parportno == port->number)
 			break;
 	}

 	if (i == DB9_MAX_PORTS)
 		return;

 	db9 = db9_base[i];
 	db9_base[i] = NULL;

 	for (i = 0; i < min(db9_modes[db9->mode].n_pads, DB9_MAX_DEVICES); i++)
 		input_unregister_device(db9->dev[i]);
 	parport_unregister_device(db9->pd);
 	kfree(db9);
 }

 static struct parport_driver db9_parport_driver = {
 	.name = "db9",
 	.match_port = db9_attach,
 	.detach = db9_detach,
 };

 static int __init db9_init(void)
 {
 	int i;
 	int have_dev = 0;

 	for (i = 0; i < DB9_MAX_PORTS; i++) {
 		if (db9_cfg[i].nargs == 0 || db9_cfg[i].args[DB9_ARG_PARPORT] < 0)
 			continue;

 		if (db9_cfg[i].nargs < 2) {
 			printk(KERN_ERR "db9.c: Device type must be specified.\n");
 			return -EINVAL;
 		}

 		have_dev = 1;
 	}

 	if (!have_dev)
 		return -ENODEV;

 	return parport_register_driver(&db9_parport_driver);
 }

 static void __exit db9_exit(void)
 {
 	parport_unregister_driver(&db9_parport_driver);
 }

 module_init(db9_init);
 module_exit(db9_exit);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (c) 1999-2001 Vojtech Pavlik
	*
	* Based on the work of:
	* Andree Borrmann Mats Sjövall
	*/

	/*
	* Atari, Amstrad, Commodore, Amiga, Sega, etc. joystick driver for Linux
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/parport.h>
	#include <linux/input.h>
	#include <linux/mutex.h>
	#include <linux/slab.h>

	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	MODULE_DESCRIPTION("Atari, Amstrad, Commodore, Amiga, Sega, etc. joystick driver");
	MODULE_LICENSE("GPL");

	struct db9_config {
	int args[2];
	unsigned int nargs;
	};

	#define DB9_MAX_PORTS 3
	static struct db9_config db9_cfg[DB9_MAX_PORTS];

	module_param_array_named(dev, db9_cfg[0].args, int, &db9_cfg[0].nargs, 0);
	MODULE_PARM_DESC(dev, "Describes first attached device (<parport#>,<type>)");
	module_param_array_named(dev2, db9_cfg[1].args, int, &db9_cfg[1].nargs, 0);
	MODULE_PARM_DESC(dev2, "Describes second attached device (<parport#>,<type>)");
	module_param_array_named(dev3, db9_cfg[2].args, int, &db9_cfg[2].nargs, 0);
	MODULE_PARM_DESC(dev3, "Describes third attached device (<parport#>,<type>)");

	#define DB9_ARG_PARPORT 0
	#define DB9_ARG_MODE 1

	#define DB9_MULTI_STICK 0x01
	#define DB9_MULTI2_STICK 0x02
	#define DB9_GENESIS_PAD 0x03
	#define DB9_GENESIS5_PAD 0x05
	#define DB9_GENESIS6_PAD 0x06
	#define DB9_SATURN_PAD 0x07
	#define DB9_MULTI_0802 0x08
	#define DB9_MULTI_0802_2 0x09
	#define DB9_CD32_PAD 0x0A
	#define DB9_SATURN_DPP 0x0B
	#define DB9_SATURN_DPP_2 0x0C
	#define DB9_MAX_PAD 0x0D

	#define DB9_UP 0x01
	#define DB9_DOWN 0x02
	#define DB9_LEFT 0x04
	#define DB9_RIGHT 0x08
	#define DB9_FIRE1 0x10
	#define DB9_FIRE2 0x20
	#define DB9_FIRE3 0x40
	#define DB9_FIRE4 0x80

	#define DB9_NORMAL 0x0a
	#define DB9_NOSELECT 0x08

	#define DB9_GENESIS6_DELAY 14
	#define DB9_REFRESH_TIME HZ/100

	#define DB9_MAX_DEVICES 2

	struct db9_mode_data {
	const char *name;
	const short *buttons;
	int n_buttons;
	int n_pads;
	int n_axis;
	int bidirectional;
	int reverse;
	};

	struct db9 {
	struct input_dev *dev[DB9_MAX_DEVICES];
	struct timer_list timer;
	struct pardevice *pd;
	int mode;
	int used;
	int parportno;
	struct mutex mutex;
	char phys[DB9_MAX_DEVICES][32];
	};

	static struct db9 *db9_base[3];

	static const short db9_multi_btn[] = { BTN_TRIGGER, BTN_THUMB };
	static const short db9_genesis_btn[] = { BTN_START, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_MODE };
	static const short db9_cd32_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START };
	static const short db9_abs[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_RZ, ABS_Z, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y };

	static const struct db9_mode_data db9_modes[] = {
	{ NULL, NULL, 0, 0, 0, 0, 0 },
	{ "Multisystem joystick", db9_multi_btn, 1, 1, 2, 1, 1 },
	{ "Multisystem joystick (2 fire)", db9_multi_btn, 2, 1, 2, 1, 1 },
	{ "Genesis pad", db9_genesis_btn, 4, 1, 2, 1, 1 },
	{ NULL, NULL, 0, 0, 0, 0, 0 },
	{ "Genesis 5 pad", db9_genesis_btn, 6, 1, 2, 1, 1 },
	{ "Genesis 6 pad", db9_genesis_btn, 8, 1, 2, 1, 1 },
	{ "Saturn pad", db9_cd32_btn, 9, 6, 7, 0, 1 },
	{ "Multisystem (0.8.0.2) joystick", db9_multi_btn, 1, 1, 2, 1, 1 },
	{ "Multisystem (0.8.0.2-dual) joystick", db9_multi_btn, 1, 2, 2, 1, 1 },
	{ "Amiga CD-32 pad", db9_cd32_btn, 7, 1, 2, 1, 1 },
	{ "Saturn dpp", db9_cd32_btn, 9, 6, 7, 0, 0 },
	{ "Saturn dpp dual", db9_cd32_btn, 9, 12, 7, 0, 0 },
	};

	/*
	* Saturn controllers
	*/
	#define DB9_SATURN_DELAY 300
	static const int db9_saturn_byte[] = { 1, 1, 1, 2, 2, 2, 2, 2, 1 };
	static const unsigned char db9_saturn_mask[] = { 0x04, 0x01, 0x02, 0x40, 0x20, 0x10, 0x08, 0x80, 0x08 };

	/*
	* db9_saturn_write_sub() writes 2 bit data.
	*/
	static void db9_saturn_write_sub(struct parport *port, int type, unsigned char data, int powered, int pwr_sub)
	{
	unsigned char c;

	switch (type) {
	case 1: /* DPP1 */
	c = 0x80 \| 0x30 \| (powered ? 0x08 : 0) \| (pwr_sub ? 0x04 : 0) \| data;
	parport_write_data(port, c);
	break;
	case 2: /* DPP2 */
	c = 0x40 \| data << 4 \| (powered ? 0x08 : 0) \| (pwr_sub ? 0x04 : 0) \| 0x03;
	parport_write_data(port, c);
	break;
	case 0: /* DB9 */
	c = ((((data & 2) ? 2 : 0) \| ((data & 1) ? 4 : 0)) ^ 0x02) \| !powered;
	parport_write_control(port, c);
	break;
	}
	}

	/*
	* gc_saturn_read_sub() reads 4 bit data.
	*/
	static unsigned char db9_saturn_read_sub(struct parport *port, int type)
	{
	unsigned char data;

	if (type) {
	/* DPP */
	data = parport_read_status(port) ^ 0x80;
	return (data & 0x80 ? 1 : 0) \| (data & 0x40 ? 2 : 0)
	\| (data & 0x20 ? 4 : 0) \| (data & 0x10 ? 8 : 0);
	} else {
	/* DB9 */
	data = parport_read_data(port) & 0x0f;
	return (data & 0x8 ? 1 : 0) \| (data & 0x4 ? 2 : 0)
	\| (data & 0x2 ? 4 : 0) \| (data & 0x1 ? 8 : 0);
	}
	}

	/*
	* db9_saturn_read_analog() sends clock and reads 8 bit data.
	*/
	static unsigned char db9_saturn_read_analog(struct parport *port, int type, int powered)
	{
	unsigned char data;

	db9_saturn_write_sub(port, type, 0, powered, 0);
	udelay(DB9_SATURN_DELAY);
	data = db9_saturn_read_sub(port, type) << 4;
	db9_saturn_write_sub(port, type, 2, powered, 0);
	udelay(DB9_SATURN_DELAY);
	data \|= db9_saturn_read_sub(port, type);
	return data;
	}

	/*
	* db9_saturn_read_packet() reads whole saturn packet at connector
	* and returns device identifier code.
	*/
	static unsigned char db9_saturn_read_packet(struct parport port, unsigned char data, int type, int powered)
	{
	int i, j;
	unsigned char tmp;

	db9_saturn_write_sub(port, type, 3, powered, 0);
	data[0] = db9_saturn_read_sub(port, type);
	switch (data[0] & 0x0f) {
	case 0xf:
	/* 1111 no pad */
	return data[0] = 0xff;
	case 0x4: case 0x4 \| 0x8:
	/* ?100 : digital controller */
	db9_saturn_write_sub(port, type, 0, powered, 1);
	data[2] = db9_saturn_read_sub(port, type) << 4;
	db9_saturn_write_sub(port, type, 2, powered, 1);
	data[1] = db9_saturn_read_sub(port, type) << 4;
	db9_saturn_write_sub(port, type, 1, powered, 1);
	data[1] \|= db9_saturn_read_sub(port, type);
	db9_saturn_write_sub(port, type, 3, powered, 1);
	/* data[2] \|= db9_saturn_read_sub(port, type); */
	data[2] \|= data[0];
	return data[0] = 0x02;
	case 0x1:
	/* 0001 : analog controller or multitap */
	db9_saturn_write_sub(port, type, 2, powered, 0);
	udelay(DB9_SATURN_DELAY);
	data[0] = db9_saturn_read_analog(port, type, powered);
	if (data[0] != 0x41) {
	/* read analog controller */
	for (i = 0; i < (data[0] & 0x0f); i++)
	data[i + 1] = db9_saturn_read_analog(port, type, powered);
	db9_saturn_write_sub(port, type, 3, powered, 0);
	return data[0];
	} else {
	/* read multitap */
	if (db9_saturn_read_analog(port, type, powered) != 0x60)
	return data[0] = 0xff;
	for (i = 0; i < 60; i += 10) {
	data[i] = db9_saturn_read_analog(port, type, powered);
	if (data[i] != 0xff)
	/* read each pad */
	for (j = 0; j < (data[i] & 0x0f); j++)
	data[i + j + 1] = db9_saturn_read_analog(port, type, powered);
	}
	db9_saturn_write_sub(port, type, 3, powered, 0);
	return 0x41;
	}
	case 0x0:
	/* 0000 : mouse */
	db9_saturn_write_sub(port, type, 2, powered, 0);
	udelay(DB9_SATURN_DELAY);
	tmp = db9_saturn_read_analog(port, type, powered);
	if (tmp == 0xff) {
	for (i = 0; i < 3; i++)
	data[i + 1] = db9_saturn_read_analog(port, type, powered);
	db9_saturn_write_sub(port, type, 3, powered, 0);
	return data[0] = 0xe3;
	}
	fallthrough;
	default:
	return data[0];
	}
	}

	/*
	* db9_saturn_report() analyzes packet and reports.
	*/
	static int db9_saturn_report(unsigned char id, unsigned char data[60], struct input_dev *devs[], int n, int max_pads)
	{
	struct input_dev *dev;
	int tmp, i, j;

	tmp = (id == 0x41) ? 60 : 10;
	for (j = 0; j < tmp && n < max_pads; j += 10, n++) {
	dev = devs[n];
	switch (data[j]) {
	case 0x16: /* multi controller (analog 4 axis) */
	input_report_abs(dev, db9_abs[5], data[j + 6]);
	fallthrough;
	case 0x15: /* mission stick (analog 3 axis) */
	input_report_abs(dev, db9_abs[3], data[j + 4]);
	input_report_abs(dev, db9_abs[4], data[j + 5]);
	fallthrough;
	case 0x13: /* racing controller (analog 1 axis) */
	input_report_abs(dev, db9_abs[2], data[j + 3]);
	fallthrough;
	case 0x34: /* saturn keyboard (udlr ZXC ASD QE Esc) */
	case 0x02: /* digital pad (digital 2 axis + buttons) */
	input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
	input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
	for (i = 0; i < 9; i++)
	input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
	break;
	case 0x19: /* mission stick x2 (analog 6 axis + buttons) */
	input_report_abs(dev, db9_abs[0], !(data[j + 1] & 128) - !(data[j + 1] & 64));
	input_report_abs(dev, db9_abs[1], !(data[j + 1] & 32) - !(data[j + 1] & 16));
	for (i = 0; i < 9; i++)
	input_report_key(dev, db9_cd32_btn[i], ~data[j + db9_saturn_byte[i]] & db9_saturn_mask[i]);
	input_report_abs(dev, db9_abs[2], data[j + 3]);
	input_report_abs(dev, db9_abs[3], data[j + 4]);
	input_report_abs(dev, db9_abs[4], data[j + 5]);
	/*
	input_report_abs(dev, db9_abs[8], (data[j + 6] & 128 ? 0 : 1) - (data[j + 6] & 64 ? 0 : 1));
	input_report_abs(dev, db9_abs[9], (data[j + 6] & 32 ? 0 : 1) - (data[j + 6] & 16 ? 0 : 1));
	*/
	input_report_abs(dev, db9_abs[6], data[j + 7]);
	input_report_abs(dev, db9_abs[7], data[j + 8]);
	input_report_abs(dev, db9_abs[5], data[j + 9]);
	break;
	case 0xd3: /* sankyo ff (analog 1 axis + stop btn) */
	input_report_key(dev, BTN_A, data[j + 3] & 0x80);
	input_report_abs(dev, db9_abs[2], data[j + 3] & 0x7f);
	break;
	case 0xe3: /* shuttle mouse (analog 2 axis + buttons. signed value) */
	input_report_key(dev, BTN_START, data[j + 1] & 0x08);
	input_report_key(dev, BTN_A, data[j + 1] & 0x04);
	input_report_key(dev, BTN_C, data[j + 1] & 0x02);
	input_report_key(dev, BTN_B, data[j + 1] & 0x01);
	input_report_abs(dev, db9_abs[2], data[j + 2] ^ 0x80);
	input_report_abs(dev, db9_abs[3], (0xff-(data[j + 3] ^ 0x80))+1); /* */
	break;
	case 0xff:
	default: /* no pad */
	input_report_abs(dev, db9_abs[0], 0);
	input_report_abs(dev, db9_abs[1], 0);
	for (i = 0; i < 9; i++)
	input_report_key(dev, db9_cd32_btn[i], 0);
	break;
	}
	}
	return n;
	}

	static int db9_saturn(int mode, struct parport port, struct input_dev devs[])
	{
	unsigned char id, data[60];
	int type, n, max_pads;
	int tmp, i;

	switch (mode) {
	case DB9_SATURN_PAD:
	type = 0;
	n = 1;
	break;
	case DB9_SATURN_DPP:
	type = 1;
	n = 1;
	break;
	case DB9_SATURN_DPP_2:
	type = 1;
	n = 2;
	break;
	default:
	return -1;
	}
	max_pads = min(db9_modes[mode].n_pads, DB9_MAX_DEVICES);
	for (tmp = 0, i = 0; i < n; i++) {
	id = db9_saturn_read_packet(port, data, type + i, 1);
	tmp = db9_saturn_report(id, data, devs, tmp, max_pads);
	}
	return 0;
	}

	static void db9_timer(struct timer_list *t)
	{
	struct db9 *db9 = from_timer(db9, t, timer);
	struct parport *port = db9->pd->port;
	struct input_dev *dev = db9->dev[0];
	struct input_dev *dev2 = db9->dev[1];
	int data, i;

	switch (db9->mode) {
	case DB9_MULTI_0802_2:

	data = parport_read_data(port) >> 3;

	input_report_abs(dev2, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev2, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev2, BTN_TRIGGER, ~data & DB9_FIRE1);
	fallthrough;

	case DB9_MULTI_0802:

	data = parport_read_status(port) >> 3;

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev, BTN_TRIGGER, data & DB9_FIRE1);
	break;

	case DB9_MULTI_STICK:

	data = parport_read_data(port);

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
	break;

	case DB9_MULTI2_STICK:

	data = parport_read_data(port);

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_THUMB, ~data & DB9_FIRE2);
	break;

	case DB9_GENESIS_PAD:

	parport_write_control(port, DB9_NOSELECT);
	data = parport_read_data(port);

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

	parport_write_control(port, DB9_NORMAL);
	data = parport_read_data(port);

	input_report_key(dev, BTN_A, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_START, ~data & DB9_FIRE2);
	break;

	case DB9_GENESIS5_PAD:

	parport_write_control(port, DB9_NOSELECT);
	data = parport_read_data(port);

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

	parport_write_control(port, DB9_NORMAL);
	data = parport_read_data(port);

	input_report_key(dev, BTN_A, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_X, ~data & DB9_FIRE2);
	input_report_key(dev, BTN_Y, ~data & DB9_LEFT);
	input_report_key(dev, BTN_START, ~data & DB9_RIGHT);
	break;

	case DB9_GENESIS6_PAD:

	parport_write_control(port, DB9_NOSELECT); /* 1 */
	udelay(DB9_GENESIS6_DELAY);
	data = parport_read_data(port);

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));
	input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

	parport_write_control(port, DB9_NORMAL);
	udelay(DB9_GENESIS6_DELAY);
	data = parport_read_data(port);

	input_report_key(dev, BTN_A, ~data & DB9_FIRE1);
	input_report_key(dev, BTN_START, ~data & DB9_FIRE2);

	parport_write_control(port, DB9_NOSELECT); /* 2 */
	udelay(DB9_GENESIS6_DELAY);
	parport_write_control(port, DB9_NORMAL);
	udelay(DB9_GENESIS6_DELAY);
	parport_write_control(port, DB9_NOSELECT); /* 3 */
	udelay(DB9_GENESIS6_DELAY);
	data=parport_read_data(port);

	input_report_key(dev, BTN_X, ~data & DB9_LEFT);
	input_report_key(dev, BTN_Y, ~data & DB9_DOWN);
	input_report_key(dev, BTN_Z, ~data & DB9_UP);
	input_report_key(dev, BTN_MODE, ~data & DB9_RIGHT);

	parport_write_control(port, DB9_NORMAL);
	udelay(DB9_GENESIS6_DELAY);
	parport_write_control(port, DB9_NOSELECT); /* 4 */
	udelay(DB9_GENESIS6_DELAY);
	parport_write_control(port, DB9_NORMAL);
	break;

	case DB9_SATURN_PAD:
	case DB9_SATURN_DPP:
	case DB9_SATURN_DPP_2:

	db9_saturn(db9->mode, port, db9->dev);
	break;

	case DB9_CD32_PAD:

	data = parport_read_data(port);

	input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
	input_report_abs(dev, ABS_Y, (data & DB9_DOWN ? 0 : 1) - (data & DB9_UP ? 0 : 1));

	parport_write_control(port, 0x0a);

	for (i = 0; i < 7; i++) {
	data = parport_read_data(port);
	parport_write_control(port, 0x02);
	parport_write_control(port, 0x0a);
	input_report_key(dev, db9_cd32_btn[i], ~data & DB9_FIRE2);
	}

	parport_write_control(port, 0x00);
	break;
	}

	input_sync(dev);

	mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
	}

	static int db9_open(struct input_dev *dev)
	{
	struct db9 *db9 = input_get_drvdata(dev);
	struct parport *port = db9->pd->port;

	scoped_guard(mutex_intr, &db9->mutex) {
	if (!db9->used++) {
	parport_claim(db9->pd);
	parport_write_data(port, 0xff);
	if (db9_modes[db9->mode].reverse) {
	parport_data_reverse(port);
	parport_write_control(port, DB9_NORMAL);
	}
	mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
	}

	return 0;
	}

	return -EINTR;
	}

	static void db9_close(struct input_dev *dev)
	{
	struct db9 *db9 = input_get_drvdata(dev);
	struct parport *port = db9->pd->port;

	guard(mutex)(&db9->mutex);

	if (!--db9->used) {
	del_timer_sync(&db9->timer);
	parport_write_control(port, 0x00);
	parport_data_forward(port);
	parport_release(db9->pd);
	}
	}

	static void db9_attach(struct parport *pp)
	{
	struct db9 *db9;
	const struct db9_mode_data *db9_mode;
	struct pardevice *pd;
	struct input_dev *input_dev;
	int i, j, port_idx;
	int mode;
	struct pardev_cb db9_parport_cb;

	for (port_idx = 0; port_idx < DB9_MAX_PORTS; port_idx++) {
	if (db9_cfg[port_idx].nargs == 0 \|\|
	db9_cfg[port_idx].args[DB9_ARG_PARPORT] < 0)
	continue;

	if (db9_cfg[port_idx].args[DB9_ARG_PARPORT] == pp->number)
	break;
	}

	if (port_idx == DB9_MAX_PORTS) {
	pr_debug("Not using parport%d.\n", pp->number);
	return;
	}

	mode = db9_cfg[port_idx].args[DB9_ARG_MODE];

	if (mode < 1 \|\| mode >= DB9_MAX_PAD \|\| !db9_modes[mode].n_buttons) {
	printk(KERN_ERR "db9.c: Bad device type %d\n", mode);
	return;
	}

	db9_mode = &db9_modes[mode];

	if (db9_mode->bidirectional && !(pp->modes & PARPORT_MODE_TRISTATE)) {
	printk(KERN_ERR "db9.c: specified parport is not bidirectional\n");
	return;
	}

	memset(&db9_parport_cb, 0, sizeof(db9_parport_cb));
	db9_parport_cb.flags = PARPORT_FLAG_EXCL;

	pd = parport_register_dev_model(pp, "db9", &db9_parport_cb, port_idx);
	if (!pd) {
	printk(KERN_ERR "db9.c: parport busy already - lp.o loaded?\n");
	return;
	}

	db9 = kzalloc(sizeof(*db9), GFP_KERNEL);
	if (!db9)
	goto err_unreg_pardev;

	mutex_init(&db9->mutex);
	db9->pd = pd;
	db9->mode = mode;
	db9->parportno = pp->number;
	timer_setup(&db9->timer, db9_timer, 0);

	for (i = 0; i < (min(db9_mode->n_pads, DB9_MAX_DEVICES)); i++) {

	db9->dev[i] = input_dev = input_allocate_device();
	if (!input_dev) {
	printk(KERN_ERR "db9.c: Not enough memory for input device\n");
	goto err_unreg_devs;
	}

	snprintf(db9->phys[i], sizeof(db9->phys[i]),
	"%s/input%d", db9->pd->port->name, i);

	input_dev->name = db9_mode->name;
	input_dev->phys = db9->phys[i];
	input_dev->id.bustype = BUS_PARPORT;
	input_dev->id.vendor = 0x0002;
	input_dev->id.product = mode;
	input_dev->id.version = 0x0100;

	input_set_drvdata(input_dev, db9);

	input_dev->open = db9_open;
	input_dev->close = db9_close;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
	for (j = 0; j < db9_mode->n_buttons; j++)
	set_bit(db9_mode->buttons[j], input_dev->keybit);
	for (j = 0; j < db9_mode->n_axis; j++) {
	if (j < 2)
	input_set_abs_params(input_dev, db9_abs[j], -1, 1, 0, 0);
	else
	input_set_abs_params(input_dev, db9_abs[j], 1, 255, 0, 0);
	}

	if (input_register_device(input_dev))
	goto err_free_dev;
	}

	db9_base[port_idx] = db9;
	return;

	err_free_dev:
	input_free_device(db9->dev[i]);
	err_unreg_devs:
	while (--i >= 0)
	input_unregister_device(db9->dev[i]);
	kfree(db9);
	err_unreg_pardev:
	parport_unregister_device(pd);
	}

	static void db9_detach(struct parport *port)
	{
	int i;
	struct db9 *db9;

	for (i = 0; i < DB9_MAX_PORTS; i++) {
	if (db9_base[i] && db9_base[i]->parportno == port->number)
	break;
	}

	if (i == DB9_MAX_PORTS)
	return;

	db9 = db9_base[i];
	db9_base[i] = NULL;

	for (i = 0; i < min(db9_modes[db9->mode].n_pads, DB9_MAX_DEVICES); i++)
	input_unregister_device(db9->dev[i]);
	parport_unregister_device(db9->pd);
	kfree(db9);
	}

	static struct parport_driver db9_parport_driver = {
	.name = "db9",
	.match_port = db9_attach,
	.detach = db9_detach,
	};

	static int __init db9_init(void)
	{
	int i;
	int have_dev = 0;

	for (i = 0; i < DB9_MAX_PORTS; i++) {
	if (db9_cfg[i].nargs == 0 \|\| db9_cfg[i].args[DB9_ARG_PARPORT] < 0)
	continue;

	if (db9_cfg[i].nargs < 2) {
	printk(KERN_ERR "db9.c: Device type must be specified.\n");
	return -EINVAL;
	}

	have_dev = 1;
	}

	if (!have_dev)
	return -ENODEV;

	return parport_register_driver(&db9_parport_driver);
	}

	static void __exit db9_exit(void)
	{
	parport_unregister_driver(&db9_parport_driver);
	}

	module_init(db9_init);
	module_exit(db9_exit);