xref: /openbmc/linux/drivers/input/joystick/gamecon.c (revision ddc141e5)
1 /*
2  * NES, SNES, N64, MultiSystem, PSX gamepad driver for Linux
3  *
4  *  Copyright (c) 1999-2004	Vojtech Pavlik <vojtech@suse.cz>
5  *  Copyright (c) 2004		Peter Nelson <rufus-kernel@hackish.org>
6  *
7  *  Based on the work of:
8  *	Andree Borrmann		John Dahlstrom
9  *	David Kuder		Nathan Hand
10  *	Raphael Assenat
11  */
12 
13 /*
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, write to the Free Software
26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27  *
28  * Should you need to contact me, the author, you can do so either by
29  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
30  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
31  */
32 
33 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
34 
35 #include <linux/kernel.h>
36 #include <linux/delay.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/parport.h>
40 #include <linux/input.h>
41 #include <linux/mutex.h>
42 #include <linux/slab.h>
43 
44 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
45 MODULE_DESCRIPTION("NES, SNES, N64, MultiSystem, PSX gamepad driver");
46 MODULE_LICENSE("GPL");
47 
48 #define GC_MAX_PORTS		3
49 #define GC_MAX_DEVICES		5
50 
51 struct gc_config {
52 	int args[GC_MAX_DEVICES + 1];
53 	unsigned int nargs;
54 };
55 
56 static struct gc_config gc_cfg[GC_MAX_PORTS];
57 
58 module_param_array_named(map, gc_cfg[0].args, int, &gc_cfg[0].nargs, 0);
59 MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<pad1>,<pad2>,..<pad5>)");
60 module_param_array_named(map2, gc_cfg[1].args, int, &gc_cfg[1].nargs, 0);
61 MODULE_PARM_DESC(map2, "Describes second set of devices");
62 module_param_array_named(map3, gc_cfg[2].args, int, &gc_cfg[2].nargs, 0);
63 MODULE_PARM_DESC(map3, "Describes third set of devices");
64 
65 /* see also gs_psx_delay parameter in PSX support section */
66 
67 enum gc_type {
68 	GC_NONE = 0,
69 	GC_SNES,
70 	GC_NES,
71 	GC_NES4,
72 	GC_MULTI,
73 	GC_MULTI2,
74 	GC_N64,
75 	GC_PSX,
76 	GC_DDR,
77 	GC_SNESMOUSE,
78 	GC_MAX
79 };
80 
81 #define GC_REFRESH_TIME	HZ/100
82 
83 struct gc_pad {
84 	struct input_dev *dev;
85 	enum gc_type type;
86 	char phys[32];
87 };
88 
89 struct gc {
90 	struct pardevice *pd;
91 	struct gc_pad pads[GC_MAX_DEVICES];
92 	struct timer_list timer;
93 	int pad_count[GC_MAX];
94 	int used;
95 	int parportno;
96 	struct mutex mutex;
97 };
98 
99 struct gc_subdev {
100 	unsigned int idx;
101 };
102 
103 static struct gc *gc_base[3];
104 
105 static const int gc_status_bit[] = { 0x40, 0x80, 0x20, 0x10, 0x08 };
106 
107 static const char *gc_names[] = {
108 	NULL, "SNES pad", "NES pad", "NES FourPort", "Multisystem joystick",
109 	"Multisystem 2-button joystick", "N64 controller", "PSX controller",
110 	"PSX DDR controller", "SNES mouse"
111 };
112 
113 /*
114  * N64 support.
115  */
116 
117 static const unsigned char gc_n64_bytes[] = { 0, 1, 13, 15, 14, 12, 10, 11, 2, 3 };
118 static const short gc_n64_btn[] = {
119 	BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z,
120 	BTN_TL, BTN_TR, BTN_TRIGGER, BTN_START
121 };
122 
123 #define GC_N64_LENGTH		32		/* N64 bit length, not including stop bit */
124 #define GC_N64_STOP_LENGTH	5		/* Length of encoded stop bit */
125 #define GC_N64_CMD_00		0x11111111UL
126 #define GC_N64_CMD_01		0xd1111111UL
127 #define GC_N64_CMD_03		0xdd111111UL
128 #define GC_N64_CMD_1b		0xdd1dd111UL
129 #define GC_N64_CMD_c0		0x111111ddUL
130 #define GC_N64_CMD_80		0x1111111dUL
131 #define GC_N64_STOP_BIT		0x1d		/* Encoded stop bit */
132 #define GC_N64_REQUEST_DATA	GC_N64_CMD_01	/* the request data command */
133 #define GC_N64_DELAY		133		/* delay between transmit request, and response ready (us) */
134 #define GC_N64_DWS		3		/* delay between write segments (required for sound playback because of ISA DMA) */
135 						/* GC_N64_DWS > 24 is known to fail */
136 #define GC_N64_POWER_W		0xe2		/* power during write (transmit request) */
137 #define GC_N64_POWER_R		0xfd		/* power during read */
138 #define GC_N64_OUT		0x1d		/* output bits to the 4 pads */
139 						/* Reading the main axes of any N64 pad is known to fail if the corresponding bit */
140 						/* in GC_N64_OUT is pulled low on the output port (by any routine) for more */
141 						/* than 123 us */
142 #define GC_N64_CLOCK		0x02		/* clock bits for read */
143 
144 /*
145  * Used for rumble code.
146  */
147 
148 /* Send encoded command */
149 static void gc_n64_send_command(struct gc *gc, unsigned long cmd,
150 				unsigned char target)
151 {
152 	struct parport *port = gc->pd->port;
153 	int i;
154 
155 	for (i = 0; i < GC_N64_LENGTH; i++) {
156 		unsigned char data = (cmd >> i) & 1 ? target : 0;
157 		parport_write_data(port, GC_N64_POWER_W | data);
158 		udelay(GC_N64_DWS);
159 	}
160 }
161 
162 /* Send stop bit */
163 static void gc_n64_send_stop_bit(struct gc *gc, unsigned char target)
164 {
165 	struct parport *port = gc->pd->port;
166 	int i;
167 
168 	for (i = 0; i < GC_N64_STOP_LENGTH; i++) {
169 		unsigned char data = (GC_N64_STOP_BIT >> i) & 1 ? target : 0;
170 		parport_write_data(port, GC_N64_POWER_W | data);
171 		udelay(GC_N64_DWS);
172 	}
173 }
174 
175 /*
176  * gc_n64_read_packet() reads an N64 packet.
177  * Each pad uses one bit per byte. So all pads connected to this port
178  * are read in parallel.
179  */
180 
181 static void gc_n64_read_packet(struct gc *gc, unsigned char *data)
182 {
183 	int i;
184 	unsigned long flags;
185 
186 /*
187  * Request the pad to transmit data
188  */
189 
190 	local_irq_save(flags);
191 	gc_n64_send_command(gc, GC_N64_REQUEST_DATA, GC_N64_OUT);
192 	gc_n64_send_stop_bit(gc, GC_N64_OUT);
193 	local_irq_restore(flags);
194 
195 /*
196  * Wait for the pad response to be loaded into the 33-bit register
197  * of the adapter.
198  */
199 
200 	udelay(GC_N64_DELAY);
201 
202 /*
203  * Grab data (ignoring the last bit, which is a stop bit)
204  */
205 
206 	for (i = 0; i < GC_N64_LENGTH; i++) {
207 		parport_write_data(gc->pd->port, GC_N64_POWER_R);
208 		udelay(2);
209 		data[i] = parport_read_status(gc->pd->port);
210 		parport_write_data(gc->pd->port, GC_N64_POWER_R | GC_N64_CLOCK);
211 	 }
212 
213 /*
214  * We must wait 200 ms here for the controller to reinitialize before
215  * the next read request. No worries as long as gc_read is polled less
216  * frequently than this.
217  */
218 
219 }
220 
221 static void gc_n64_process_packet(struct gc *gc)
222 {
223 	unsigned char data[GC_N64_LENGTH];
224 	struct input_dev *dev;
225 	int i, j, s;
226 	signed char x, y;
227 
228 	gc_n64_read_packet(gc, data);
229 
230 	for (i = 0; i < GC_MAX_DEVICES; i++) {
231 
232 		if (gc->pads[i].type != GC_N64)
233 			continue;
234 
235 		dev = gc->pads[i].dev;
236 		s = gc_status_bit[i];
237 
238 		if (s & ~(data[8] | data[9])) {
239 
240 			x = y = 0;
241 
242 			for (j = 0; j < 8; j++) {
243 				if (data[23 - j] & s)
244 					x |= 1 << j;
245 				if (data[31 - j] & s)
246 					y |= 1 << j;
247 			}
248 
249 			input_report_abs(dev, ABS_X,  x);
250 			input_report_abs(dev, ABS_Y, -y);
251 
252 			input_report_abs(dev, ABS_HAT0X,
253 					 !(s & data[6]) - !(s & data[7]));
254 			input_report_abs(dev, ABS_HAT0Y,
255 					 !(s & data[4]) - !(s & data[5]));
256 
257 			for (j = 0; j < 10; j++)
258 				input_report_key(dev, gc_n64_btn[j],
259 						 s & data[gc_n64_bytes[j]]);
260 
261 			input_sync(dev);
262 		}
263 	}
264 }
265 
266 static int gc_n64_play_effect(struct input_dev *dev, void *data,
267 			      struct ff_effect *effect)
268 {
269 	int i;
270 	unsigned long flags;
271 	struct gc *gc = input_get_drvdata(dev);
272 	struct gc_subdev *sdev = data;
273 	unsigned char target = 1 << sdev->idx; /* select desired pin */
274 
275 	if (effect->type == FF_RUMBLE) {
276 		struct ff_rumble_effect *rumble = &effect->u.rumble;
277 		unsigned int cmd =
278 			rumble->strong_magnitude || rumble->weak_magnitude ?
279 			GC_N64_CMD_01 : GC_N64_CMD_00;
280 
281 		local_irq_save(flags);
282 
283 		/* Init Rumble - 0x03, 0x80, 0x01, (34)0x80 */
284 		gc_n64_send_command(gc, GC_N64_CMD_03, target);
285 		gc_n64_send_command(gc, GC_N64_CMD_80, target);
286 		gc_n64_send_command(gc, GC_N64_CMD_01, target);
287 		for (i = 0; i < 32; i++)
288 			gc_n64_send_command(gc, GC_N64_CMD_80, target);
289 		gc_n64_send_stop_bit(gc, target);
290 
291 		udelay(GC_N64_DELAY);
292 
293 		/* Now start or stop it - 0x03, 0xc0, 0zx1b, (32)0x01/0x00 */
294 		gc_n64_send_command(gc, GC_N64_CMD_03, target);
295 		gc_n64_send_command(gc, GC_N64_CMD_c0, target);
296 		gc_n64_send_command(gc, GC_N64_CMD_1b, target);
297 		for (i = 0; i < 32; i++)
298 			gc_n64_send_command(gc, cmd, target);
299 		gc_n64_send_stop_bit(gc, target);
300 
301 		local_irq_restore(flags);
302 
303 	}
304 
305 	return 0;
306 }
307 
308 static int gc_n64_init_ff(struct input_dev *dev, int i)
309 {
310 	struct gc_subdev *sdev;
311 	int err;
312 
313 	sdev = kmalloc(sizeof(*sdev), GFP_KERNEL);
314 	if (!sdev)
315 		return -ENOMEM;
316 
317 	sdev->idx = i;
318 
319 	input_set_capability(dev, EV_FF, FF_RUMBLE);
320 
321 	err = input_ff_create_memless(dev, sdev, gc_n64_play_effect);
322 	if (err) {
323 		kfree(sdev);
324 		return err;
325 	}
326 
327 	return 0;
328 }
329 
330 /*
331  * NES/SNES support.
332  */
333 
334 #define GC_NES_DELAY		6	/* Delay between bits - 6us */
335 #define GC_NES_LENGTH		8	/* The NES pads use 8 bits of data */
336 #define GC_SNES_LENGTH		12	/* The SNES true length is 16, but the
337 					   last 4 bits are unused */
338 #define GC_SNESMOUSE_LENGTH	32	/* The SNES mouse uses 32 bits, the first
339 					   16 bits are equivalent to a gamepad */
340 
341 #define GC_NES_POWER	0xfc
342 #define GC_NES_CLOCK	0x01
343 #define GC_NES_LATCH	0x02
344 
345 static const unsigned char gc_nes_bytes[] = { 0, 1, 2, 3 };
346 static const unsigned char gc_snes_bytes[] = { 8, 0, 2, 3, 9, 1, 10, 11 };
347 static const short gc_snes_btn[] = {
348 	BTN_A, BTN_B, BTN_SELECT, BTN_START, BTN_X, BTN_Y, BTN_TL, BTN_TR
349 };
350 
351 /*
352  * gc_nes_read_packet() reads a NES/SNES packet.
353  * Each pad uses one bit per byte. So all pads connected to
354  * this port are read in parallel.
355  */
356 
357 static void gc_nes_read_packet(struct gc *gc, int length, unsigned char *data)
358 {
359 	int i;
360 
361 	parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK | GC_NES_LATCH);
362 	udelay(GC_NES_DELAY * 2);
363 	parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
364 
365 	for (i = 0; i < length; i++) {
366 		udelay(GC_NES_DELAY);
367 		parport_write_data(gc->pd->port, GC_NES_POWER);
368 		data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
369 		udelay(GC_NES_DELAY);
370 		parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
371 	}
372 }
373 
374 static void gc_nes_process_packet(struct gc *gc)
375 {
376 	unsigned char data[GC_SNESMOUSE_LENGTH];
377 	struct gc_pad *pad;
378 	struct input_dev *dev;
379 	int i, j, s, len;
380 	char x_rel, y_rel;
381 
382 	len = gc->pad_count[GC_SNESMOUSE] ? GC_SNESMOUSE_LENGTH :
383 			(gc->pad_count[GC_SNES] ? GC_SNES_LENGTH : GC_NES_LENGTH);
384 
385 	gc_nes_read_packet(gc, len, data);
386 
387 	for (i = 0; i < GC_MAX_DEVICES; i++) {
388 
389 		pad = &gc->pads[i];
390 		dev = pad->dev;
391 		s = gc_status_bit[i];
392 
393 		switch (pad->type) {
394 
395 		case GC_NES:
396 
397 			input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
398 			input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));
399 
400 			for (j = 0; j < 4; j++)
401 				input_report_key(dev, gc_snes_btn[j],
402 						 s & data[gc_nes_bytes[j]]);
403 			input_sync(dev);
404 			break;
405 
406 		case GC_SNES:
407 
408 			input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
409 			input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));
410 
411 			for (j = 0; j < 8; j++)
412 				input_report_key(dev, gc_snes_btn[j],
413 						 s & data[gc_snes_bytes[j]]);
414 			input_sync(dev);
415 			break;
416 
417 		case GC_SNESMOUSE:
418 			/*
419 			 * The 4 unused bits from SNES controllers appear
420 			 * to be ID bits so use them to make sure we are
421 			 * dealing with a mouse.
422 			 * gamepad is connected. This is important since
423 			 * my SNES gamepad sends 1's for bits 16-31, which
424 			 * cause the mouse pointer to quickly move to the
425 			 * upper left corner of the screen.
426 			 */
427 			if (!(s & data[12]) && !(s & data[13]) &&
428 			    !(s & data[14]) && (s & data[15])) {
429 				input_report_key(dev, BTN_LEFT, s & data[9]);
430 				input_report_key(dev, BTN_RIGHT, s & data[8]);
431 
432 				x_rel = y_rel = 0;
433 				for (j = 0; j < 7; j++) {
434 					x_rel <<= 1;
435 					if (data[25 + j] & s)
436 						x_rel |= 1;
437 
438 					y_rel <<= 1;
439 					if (data[17 + j] & s)
440 						y_rel |= 1;
441 				}
442 
443 				if (x_rel) {
444 					if (data[24] & s)
445 						x_rel = -x_rel;
446 					input_report_rel(dev, REL_X, x_rel);
447 				}
448 
449 				if (y_rel) {
450 					if (data[16] & s)
451 						y_rel = -y_rel;
452 					input_report_rel(dev, REL_Y, y_rel);
453 				}
454 
455 				input_sync(dev);
456 			}
457 			break;
458 
459 		default:
460 			break;
461 		}
462 	}
463 }
464 
465 /*
466  * Multisystem joystick support
467  */
468 
469 #define GC_MULTI_LENGTH		5	/* Multi system joystick packet length is 5 */
470 #define GC_MULTI2_LENGTH	6	/* One more bit for one more button */
471 
472 /*
473  * gc_multi_read_packet() reads a Multisystem joystick packet.
474  */
475 
476 static void gc_multi_read_packet(struct gc *gc, int length, unsigned char *data)
477 {
478 	int i;
479 
480 	for (i = 0; i < length; i++) {
481 		parport_write_data(gc->pd->port, ~(1 << i));
482 		data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
483 	}
484 }
485 
486 static void gc_multi_process_packet(struct gc *gc)
487 {
488 	unsigned char data[GC_MULTI2_LENGTH];
489 	int data_len = gc->pad_count[GC_MULTI2] ? GC_MULTI2_LENGTH : GC_MULTI_LENGTH;
490 	struct gc_pad *pad;
491 	struct input_dev *dev;
492 	int i, s;
493 
494 	gc_multi_read_packet(gc, data_len, data);
495 
496 	for (i = 0; i < GC_MAX_DEVICES; i++) {
497 		pad = &gc->pads[i];
498 		dev = pad->dev;
499 		s = gc_status_bit[i];
500 
501 		switch (pad->type) {
502 		case GC_MULTI2:
503 			input_report_key(dev, BTN_THUMB, s & data[5]);
504 			/* fall through */
505 
506 		case GC_MULTI:
507 			input_report_abs(dev, ABS_X,
508 					 !(s & data[2]) - !(s & data[3]));
509 			input_report_abs(dev, ABS_Y,
510 					 !(s & data[0]) - !(s & data[1]));
511 			input_report_key(dev, BTN_TRIGGER, s & data[4]);
512 			input_sync(dev);
513 			break;
514 
515 		default:
516 			break;
517 		}
518 	}
519 }
520 
521 /*
522  * PSX support
523  *
524  * See documentation at:
525  *	http://www.geocities.co.jp/Playtown/2004/psx/ps_eng.txt
526  *	http://www.gamesx.com/controldata/psxcont/psxcont.htm
527  *
528  */
529 
530 #define GC_PSX_DELAY	25		/* 25 usec */
531 #define GC_PSX_LENGTH	8		/* talk to the controller in bits */
532 #define GC_PSX_BYTES	6		/* the maximum number of bytes to read off the controller */
533 
534 #define GC_PSX_MOUSE	1		/* Mouse */
535 #define GC_PSX_NEGCON	2		/* NegCon */
536 #define GC_PSX_NORMAL	4		/* Digital / Analog or Rumble in Digital mode  */
537 #define GC_PSX_ANALOG	5		/* Analog in Analog mode / Rumble in Green mode */
538 #define GC_PSX_RUMBLE	7		/* Rumble in Red mode */
539 
540 #define GC_PSX_CLOCK	0x04		/* Pin 4 */
541 #define GC_PSX_COMMAND	0x01		/* Pin 2 */
542 #define GC_PSX_POWER	0xf8		/* Pins 5-9 */
543 #define GC_PSX_SELECT	0x02		/* Pin 3 */
544 
545 #define GC_PSX_ID(x)	((x) >> 4)	/* High nibble is device type */
546 #define GC_PSX_LEN(x)	(((x) & 0xf) << 1)	/* Low nibble is length in bytes/2 */
547 
548 static int gc_psx_delay = GC_PSX_DELAY;
549 module_param_named(psx_delay, gc_psx_delay, uint, 0);
550 MODULE_PARM_DESC(psx_delay, "Delay when accessing Sony PSX controller (usecs)");
551 
552 static const short gc_psx_abs[] = {
553 	ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_HAT0X, ABS_HAT0Y
554 };
555 static const short gc_psx_btn[] = {
556 	BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_A, BTN_B, BTN_X, BTN_Y,
557 	BTN_START, BTN_SELECT, BTN_THUMBL, BTN_THUMBR
558 };
559 static const short gc_psx_ddr_btn[] = { BTN_0, BTN_1, BTN_2, BTN_3 };
560 
561 /*
562  * gc_psx_command() writes 8bit command and reads 8bit data from
563  * the psx pad.
564  */
565 
566 static void gc_psx_command(struct gc *gc, int b, unsigned char *data)
567 {
568 	struct parport *port = gc->pd->port;
569 	int i, j, cmd, read;
570 
571 	memset(data, 0, GC_MAX_DEVICES);
572 
573 	for (i = 0; i < GC_PSX_LENGTH; i++, b >>= 1) {
574 		cmd = (b & 1) ? GC_PSX_COMMAND : 0;
575 		parport_write_data(port, cmd | GC_PSX_POWER);
576 		udelay(gc_psx_delay);
577 
578 		read = parport_read_status(port) ^ 0x80;
579 
580 		for (j = 0; j < GC_MAX_DEVICES; j++) {
581 			struct gc_pad *pad = &gc->pads[j];
582 
583 			if (pad->type == GC_PSX || pad->type == GC_DDR)
584 				data[j] |= (read & gc_status_bit[j]) ? (1 << i) : 0;
585 		}
586 
587 		parport_write_data(gc->pd->port, cmd | GC_PSX_CLOCK | GC_PSX_POWER);
588 		udelay(gc_psx_delay);
589 	}
590 }
591 
592 /*
593  * gc_psx_read_packet() reads a whole psx packet and returns
594  * device identifier code.
595  */
596 
597 static void gc_psx_read_packet(struct gc *gc,
598 			       unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES],
599 			       unsigned char id[GC_MAX_DEVICES])
600 {
601 	int i, j, max_len = 0;
602 	unsigned long flags;
603 	unsigned char data2[GC_MAX_DEVICES];
604 
605 	/* Select pad */
606 	parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
607 	udelay(gc_psx_delay);
608 	/* Deselect, begin command */
609 	parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER);
610 	udelay(gc_psx_delay);
611 
612 	local_irq_save(flags);
613 
614 	gc_psx_command(gc, 0x01, data2);	/* Access pad */
615 	gc_psx_command(gc, 0x42, id);		/* Get device ids */
616 	gc_psx_command(gc, 0, data2);		/* Dump status */
617 
618 	/* Find the longest pad */
619 	for (i = 0; i < GC_MAX_DEVICES; i++) {
620 		struct gc_pad *pad = &gc->pads[i];
621 
622 		if ((pad->type == GC_PSX || pad->type == GC_DDR) &&
623 		    GC_PSX_LEN(id[i]) > max_len &&
624 		    GC_PSX_LEN(id[i]) <= GC_PSX_BYTES) {
625 			max_len = GC_PSX_LEN(id[i]);
626 		}
627 	}
628 
629 	/* Read in all the data */
630 	for (i = 0; i < max_len; i++) {
631 		gc_psx_command(gc, 0, data2);
632 		for (j = 0; j < GC_MAX_DEVICES; j++)
633 			data[j][i] = data2[j];
634 	}
635 
636 	local_irq_restore(flags);
637 
638 	parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);
639 
640 	/* Set id's to the real value */
641 	for (i = 0; i < GC_MAX_DEVICES; i++)
642 		id[i] = GC_PSX_ID(id[i]);
643 }
644 
645 static void gc_psx_report_one(struct gc_pad *pad, unsigned char psx_type,
646 			      unsigned char *data)
647 {
648 	struct input_dev *dev = pad->dev;
649 	int i;
650 
651 	switch (psx_type) {
652 
653 	case GC_PSX_RUMBLE:
654 
655 		input_report_key(dev, BTN_THUMBL, ~data[0] & 0x04);
656 		input_report_key(dev, BTN_THUMBR, ~data[0] & 0x02);
657 		/* fall through */
658 
659 	case GC_PSX_NEGCON:
660 	case GC_PSX_ANALOG:
661 
662 		if (pad->type == GC_DDR) {
663 			for (i = 0; i < 4; i++)
664 				input_report_key(dev, gc_psx_ddr_btn[i],
665 						 ~data[0] & (0x10 << i));
666 		} else {
667 			for (i = 0; i < 4; i++)
668 				input_report_abs(dev, gc_psx_abs[i + 2],
669 						 data[i + 2]);
670 
671 			input_report_abs(dev, ABS_X,
672 				!!(data[0] & 0x80) * 128 + !(data[0] & 0x20) * 127);
673 			input_report_abs(dev, ABS_Y,
674 				!!(data[0] & 0x10) * 128 + !(data[0] & 0x40) * 127);
675 		}
676 
677 		for (i = 0; i < 8; i++)
678 			input_report_key(dev, gc_psx_btn[i], ~data[1] & (1 << i));
679 
680 		input_report_key(dev, BTN_START,  ~data[0] & 0x08);
681 		input_report_key(dev, BTN_SELECT, ~data[0] & 0x01);
682 
683 		input_sync(dev);
684 
685 		break;
686 
687 	case GC_PSX_NORMAL:
688 
689 		if (pad->type == GC_DDR) {
690 			for (i = 0; i < 4; i++)
691 				input_report_key(dev, gc_psx_ddr_btn[i],
692 						 ~data[0] & (0x10 << i));
693 		} else {
694 			input_report_abs(dev, ABS_X,
695 				!!(data[0] & 0x80) * 128 + !(data[0] & 0x20) * 127);
696 			input_report_abs(dev, ABS_Y,
697 				!!(data[0] & 0x10) * 128 + !(data[0] & 0x40) * 127);
698 
699 			/*
700 			 * For some reason if the extra axes are left unset
701 			 * they drift.
702 			 * for (i = 0; i < 4; i++)
703 				input_report_abs(dev, gc_psx_abs[i + 2], 128);
704 			 * This needs to be debugged properly,
705 			 * maybe fuzz processing needs to be done
706 			 * in input_sync()
707 			 *				 --vojtech
708 			 */
709 		}
710 
711 		for (i = 0; i < 8; i++)
712 			input_report_key(dev, gc_psx_btn[i], ~data[1] & (1 << i));
713 
714 		input_report_key(dev, BTN_START,  ~data[0] & 0x08);
715 		input_report_key(dev, BTN_SELECT, ~data[0] & 0x01);
716 
717 		input_sync(dev);
718 
719 		break;
720 
721 	default: /* not a pad, ignore */
722 		break;
723 	}
724 }
725 
726 static void gc_psx_process_packet(struct gc *gc)
727 {
728 	unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES];
729 	unsigned char id[GC_MAX_DEVICES];
730 	struct gc_pad *pad;
731 	int i;
732 
733 	gc_psx_read_packet(gc, data, id);
734 
735 	for (i = 0; i < GC_MAX_DEVICES; i++) {
736 		pad = &gc->pads[i];
737 		if (pad->type == GC_PSX || pad->type == GC_DDR)
738 			gc_psx_report_one(pad, id[i], data[i]);
739 	}
740 }
741 
742 /*
743  * gc_timer() initiates reads of console pads data.
744  */
745 
746 static void gc_timer(struct timer_list *t)
747 {
748 	struct gc *gc = from_timer(gc, t, timer);
749 
750 /*
751  * N64 pads - must be read first, any read confuses them for 200 us
752  */
753 
754 	if (gc->pad_count[GC_N64])
755 		gc_n64_process_packet(gc);
756 
757 /*
758  * NES and SNES pads or mouse
759  */
760 
761 	if (gc->pad_count[GC_NES] ||
762 	    gc->pad_count[GC_SNES] ||
763 	    gc->pad_count[GC_SNESMOUSE]) {
764 		gc_nes_process_packet(gc);
765 	}
766 
767 /*
768  * Multi and Multi2 joysticks
769  */
770 
771 	if (gc->pad_count[GC_MULTI] || gc->pad_count[GC_MULTI2])
772 		gc_multi_process_packet(gc);
773 
774 /*
775  * PSX controllers
776  */
777 
778 	if (gc->pad_count[GC_PSX] || gc->pad_count[GC_DDR])
779 		gc_psx_process_packet(gc);
780 
781 	mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
782 }
783 
784 static int gc_open(struct input_dev *dev)
785 {
786 	struct gc *gc = input_get_drvdata(dev);
787 	int err;
788 
789 	err = mutex_lock_interruptible(&gc->mutex);
790 	if (err)
791 		return err;
792 
793 	if (!gc->used++) {
794 		parport_claim(gc->pd);
795 		parport_write_control(gc->pd->port, 0x04);
796 		mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
797 	}
798 
799 	mutex_unlock(&gc->mutex);
800 	return 0;
801 }
802 
803 static void gc_close(struct input_dev *dev)
804 {
805 	struct gc *gc = input_get_drvdata(dev);
806 
807 	mutex_lock(&gc->mutex);
808 	if (!--gc->used) {
809 		del_timer_sync(&gc->timer);
810 		parport_write_control(gc->pd->port, 0x00);
811 		parport_release(gc->pd);
812 	}
813 	mutex_unlock(&gc->mutex);
814 }
815 
816 static int gc_setup_pad(struct gc *gc, int idx, int pad_type)
817 {
818 	struct gc_pad *pad = &gc->pads[idx];
819 	struct input_dev *input_dev;
820 	int i;
821 	int err;
822 
823 	if (pad_type < 1 || pad_type >= GC_MAX) {
824 		pr_err("Pad type %d unknown\n", pad_type);
825 		return -EINVAL;
826 	}
827 
828 	pad->dev = input_dev = input_allocate_device();
829 	if (!input_dev) {
830 		pr_err("Not enough memory for input device\n");
831 		return -ENOMEM;
832 	}
833 
834 	pad->type = pad_type;
835 
836 	snprintf(pad->phys, sizeof(pad->phys),
837 		 "%s/input%d", gc->pd->port->name, idx);
838 
839 	input_dev->name = gc_names[pad_type];
840 	input_dev->phys = pad->phys;
841 	input_dev->id.bustype = BUS_PARPORT;
842 	input_dev->id.vendor = 0x0001;
843 	input_dev->id.product = pad_type;
844 	input_dev->id.version = 0x0100;
845 
846 	input_set_drvdata(input_dev, gc);
847 
848 	input_dev->open = gc_open;
849 	input_dev->close = gc_close;
850 
851 	if (pad_type != GC_SNESMOUSE) {
852 		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
853 
854 		for (i = 0; i < 2; i++)
855 			input_set_abs_params(input_dev, ABS_X + i, -1, 1, 0, 0);
856 	} else
857 		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
858 
859 	gc->pad_count[pad_type]++;
860 
861 	switch (pad_type) {
862 
863 	case GC_N64:
864 		for (i = 0; i < 10; i++)
865 			__set_bit(gc_n64_btn[i], input_dev->keybit);
866 
867 		for (i = 0; i < 2; i++) {
868 			input_set_abs_params(input_dev, ABS_X + i, -127, 126, 0, 2);
869 			input_set_abs_params(input_dev, ABS_HAT0X + i, -1, 1, 0, 0);
870 		}
871 
872 		err = gc_n64_init_ff(input_dev, idx);
873 		if (err) {
874 			pr_warn("Failed to initiate rumble for N64 device %d\n",
875 				idx);
876 			goto err_free_dev;
877 		}
878 
879 		break;
880 
881 	case GC_SNESMOUSE:
882 		__set_bit(BTN_LEFT, input_dev->keybit);
883 		__set_bit(BTN_RIGHT, input_dev->keybit);
884 		__set_bit(REL_X, input_dev->relbit);
885 		__set_bit(REL_Y, input_dev->relbit);
886 		break;
887 
888 	case GC_SNES:
889 		for (i = 4; i < 8; i++)
890 			__set_bit(gc_snes_btn[i], input_dev->keybit);
891 		/* fall through */
892 	case GC_NES:
893 		for (i = 0; i < 4; i++)
894 			__set_bit(gc_snes_btn[i], input_dev->keybit);
895 		break;
896 
897 	case GC_MULTI2:
898 		__set_bit(BTN_THUMB, input_dev->keybit);
899 		/* fall through */
900 	case GC_MULTI:
901 		__set_bit(BTN_TRIGGER, input_dev->keybit);
902 		break;
903 
904 	case GC_PSX:
905 		for (i = 0; i < 6; i++)
906 			input_set_abs_params(input_dev,
907 					     gc_psx_abs[i], 4, 252, 0, 2);
908 		for (i = 0; i < 12; i++)
909 			__set_bit(gc_psx_btn[i], input_dev->keybit);
910 
911 		break;
912 
913 	case GC_DDR:
914 		for (i = 0; i < 4; i++)
915 			__set_bit(gc_psx_ddr_btn[i], input_dev->keybit);
916 		for (i = 0; i < 12; i++)
917 			__set_bit(gc_psx_btn[i], input_dev->keybit);
918 
919 		break;
920 	}
921 
922 	err = input_register_device(pad->dev);
923 	if (err)
924 		goto err_free_dev;
925 
926 	return 0;
927 
928 err_free_dev:
929 	input_free_device(pad->dev);
930 	pad->dev = NULL;
931 	return err;
932 }
933 
934 static void gc_attach(struct parport *pp)
935 {
936 	struct gc *gc;
937 	struct pardevice *pd;
938 	int i, port_idx;
939 	int count = 0;
940 	int *pads, n_pads;
941 	struct pardev_cb gc_parport_cb;
942 
943 	for (port_idx = 0; port_idx < GC_MAX_PORTS; port_idx++) {
944 		if (gc_cfg[port_idx].nargs == 0 || gc_cfg[port_idx].args[0] < 0)
945 			continue;
946 
947 		if (gc_cfg[port_idx].args[0] == pp->number)
948 			break;
949 	}
950 
951 	if (port_idx == GC_MAX_PORTS) {
952 		pr_debug("Not using parport%d.\n", pp->number);
953 		return;
954 	}
955 	pads = gc_cfg[port_idx].args + 1;
956 	n_pads = gc_cfg[port_idx].nargs - 1;
957 
958 	memset(&gc_parport_cb, 0, sizeof(gc_parport_cb));
959 	gc_parport_cb.flags = PARPORT_FLAG_EXCL;
960 
961 	pd = parport_register_dev_model(pp, "gamecon", &gc_parport_cb,
962 					port_idx);
963 	if (!pd) {
964 		pr_err("parport busy already - lp.o loaded?\n");
965 		return;
966 	}
967 
968 	gc = kzalloc(sizeof(struct gc), GFP_KERNEL);
969 	if (!gc) {
970 		pr_err("Not enough memory\n");
971 		goto err_unreg_pardev;
972 	}
973 
974 	mutex_init(&gc->mutex);
975 	gc->pd = pd;
976 	gc->parportno = pp->number;
977 	timer_setup(&gc->timer, gc_timer, 0);
978 
979 	for (i = 0; i < n_pads && i < GC_MAX_DEVICES; i++) {
980 		if (!pads[i])
981 			continue;
982 
983 		if (gc_setup_pad(gc, i, pads[i]))
984 			goto err_unreg_devs;
985 
986 		count++;
987 	}
988 
989 	if (count == 0) {
990 		pr_err("No valid devices specified\n");
991 		goto err_free_gc;
992 	}
993 
994 	gc_base[port_idx] = gc;
995 	return;
996 
997  err_unreg_devs:
998 	while (--i >= 0)
999 		if (gc->pads[i].dev)
1000 			input_unregister_device(gc->pads[i].dev);
1001  err_free_gc:
1002 	kfree(gc);
1003  err_unreg_pardev:
1004 	parport_unregister_device(pd);
1005 }
1006 
1007 static void gc_detach(struct parport *port)
1008 {
1009 	int i;
1010 	struct gc *gc;
1011 
1012 	for (i = 0; i < GC_MAX_PORTS; i++) {
1013 		if (gc_base[i] && gc_base[i]->parportno == port->number)
1014 			break;
1015 	}
1016 
1017 	if (i == GC_MAX_PORTS)
1018 		return;
1019 
1020 	gc = gc_base[i];
1021 	gc_base[i] = NULL;
1022 
1023 	for (i = 0; i < GC_MAX_DEVICES; i++)
1024 		if (gc->pads[i].dev)
1025 			input_unregister_device(gc->pads[i].dev);
1026 	parport_unregister_device(gc->pd);
1027 	kfree(gc);
1028 }
1029 
1030 static struct parport_driver gc_parport_driver = {
1031 	.name = "gamecon",
1032 	.match_port = gc_attach,
1033 	.detach = gc_detach,
1034 	.devmodel = true,
1035 };
1036 
1037 static int __init gc_init(void)
1038 {
1039 	int i;
1040 	int have_dev = 0;
1041 
1042 	for (i = 0; i < GC_MAX_PORTS; i++) {
1043 		if (gc_cfg[i].nargs == 0 || gc_cfg[i].args[0] < 0)
1044 			continue;
1045 
1046 		if (gc_cfg[i].nargs < 2) {
1047 			pr_err("at least one device must be specified\n");
1048 			return -EINVAL;
1049 		}
1050 
1051 		have_dev = 1;
1052 	}
1053 
1054 	if (!have_dev)
1055 		return -ENODEV;
1056 
1057 	return parport_register_driver(&gc_parport_driver);
1058 }
1059 
1060 static void __exit gc_exit(void)
1061 {
1062 	parport_unregister_driver(&gc_parport_driver);
1063 }
1064 
1065 module_init(gc_init);
1066 module_exit(gc_exit);
1067