Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
/*
 *  Copyright (c) 1996-2001 Vojtech Pavlik
 */

/*
 * Analog joystick and gamepad 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/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
#include <linux/jiffies.h>
#include <asm/timex.h>

#define DRIVER_DESC	"Analog joystick and gamepad driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Option parsing.
 */

#define ANALOG_PORTS		16

static char *js[ANALOG_PORTS];
static unsigned int js_nargs;
static int analog_options[ANALOG_PORTS];
module_param_array_named(map, js, charp, &js_nargs, 0);
MODULE_PARM_DESC(map, "Describes analog joysticks type/capabilities");

/*
 * Times, feature definitions.
 */

#define ANALOG_RUDDER		0x00004
#define ANALOG_THROTTLE		0x00008
#define ANALOG_AXES_STD		0x0000f
#define ANALOG_BTNS_STD		0x000f0

#define ANALOG_BTNS_CHF		0x00100
#define ANALOG_HAT1_CHF		0x00200
#define ANALOG_HAT2_CHF		0x00400
#define ANALOG_HAT_FCS		0x00800
#define ANALOG_HATS_ALL		0x00e00
#define ANALOG_BTN_TL		0x01000
#define ANALOG_BTN_TR		0x02000
#define ANALOG_BTN_TL2		0x04000
#define ANALOG_BTN_TR2		0x08000
#define ANALOG_BTNS_TLR		0x03000
#define ANALOG_BTNS_TLR2	0x0c000
#define ANALOG_BTNS_GAMEPAD	0x0f000

#define ANALOG_HBTN_CHF		0x10000
#define ANALOG_ANY_CHF		0x10700
#define ANALOG_SAITEK		0x20000
#define ANALOG_EXTENSIONS	0x7ff00
#define ANALOG_GAMEPAD		0x80000

#define ANALOG_MAX_TIME		3	/* 3 ms */
#define ANALOG_LOOP_TIME	2000	/* 2 * loop */
#define ANALOG_SAITEK_DELAY	200	/* 200 us */
#define ANALOG_SAITEK_TIME	2000	/* 2000 us */
#define ANALOG_AXIS_TIME	2	/* 2 * refresh */
#define ANALOG_INIT_RETRIES	8	/* 8 times */
#define ANALOG_FUZZ_BITS	2	/* 2 bit more */
#define ANALOG_FUZZ_MAGIC	36	/* 36 u*ms/loop */

#define ANALOG_MAX_NAME_LENGTH  128
#define ANALOG_MAX_PHYS_LENGTH	32

static short analog_axes[] = { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE };
static short analog_hats[] = { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };
static short analog_pads[] = { BTN_Y, BTN_Z, BTN_TL, BTN_TR };
static short analog_exts[] = { ANALOG_HAT1_CHF, ANALOG_HAT2_CHF, ANALOG_HAT_FCS };
static short analog_pad_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_TL2, BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_BASE };
static short analog_joy_btn[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2,
				  BTN_BASE3, BTN_BASE4, BTN_BASE5, BTN_BASE6 };

static unsigned char analog_chf[] = { 0xf, 0x0, 0x1, 0x9, 0x2, 0x4, 0xc, 0x8, 0x3, 0x5, 0xb, 0x7, 0xd, 0xe, 0xa, 0x6 };

struct analog {
	struct input_dev *dev;
	int mask;
	short *buttons;
	char name[ANALOG_MAX_NAME_LENGTH];
	char phys[ANALOG_MAX_PHYS_LENGTH];
};

struct analog_port {
	struct gameport *gameport;
	struct analog analog[2];
	unsigned char mask;
	char saitek;
	char cooked;
	int bads;
	int reads;
	int speed;
	int loop;
	int fuzz;
	int axes[4];
	int buttons;
	int initial[4];
	int axtime;
};

/*
 * Time macros.
 */

#ifdef __i386__

#include <asm/i8253.h>

#define GET_TIME(x)	do { if (cpu_has_tsc) rdtscl(x); else x = get_time_pit(); } while (0)
#define DELTA(x,y)	(cpu_has_tsc ? ((y) - (x)) : ((x) - (y) + ((x) < (y) ? CLOCK_TICK_RATE / HZ : 0)))
#define TIME_NAME	(cpu_has_tsc?"TSC":"PIT")
static unsigned int get_time_pit(void)
{
        unsigned long flags;
        unsigned int count;

        spin_lock_irqsave(&i8253_lock, flags);
        outb_p(0x00, 0x43);
        count = inb_p(0x40);
        count |= inb_p(0x40) << 8;
        spin_unlock_irqrestore(&i8253_lock, flags);

        return count;
}
#elif defined(__x86_64__)
#define GET_TIME(x)	rdtscl(x)
#define DELTA(x,y)	((y)-(x))
#define TIME_NAME	"TSC"
#elif defined(__alpha__)
#define GET_TIME(x)	do { x = get_cycles(); } while (0)
#define DELTA(x,y)	((y)-(x))
#define TIME_NAME	"PCC"
#elif defined(CONFIG_MN10300)
#define GET_TIME(x)	do { x = get_cycles(); } while (0)
#define DELTA(x, y)	((x) - (y))
#define TIME_NAME	"TSC"
#else
#define FAKE_TIME
static unsigned long analog_faketime = 0;
#define GET_TIME(x)     do { x = analog_faketime++; } while(0)
#define DELTA(x,y)	((y)-(x))
#define TIME_NAME	"Unreliable"
#warning Precise timer not defined for this architecture.
#endif

/*
 * analog_decode() decodes analog joystick data and reports input events.
 */

static void analog_decode(struct analog *analog, int *axes, int *initial, int buttons)
{
	struct input_dev *dev = analog->dev;
	int i, j;

	if (analog->mask & ANALOG_HAT_FCS)
		for (i = 0; i < 4; i++)
			if (axes[3] < ((initial[3] * ((i << 1) + 1)) >> 3)) {
				buttons |= 1 << (i + 14);
				break;
			}

	for (i = j = 0; i < 6; i++)
		if (analog->mask & (0x10 << i))
			input_report_key(dev, analog->buttons[j++], (buttons >> i) & 1);

	if (analog->mask & ANALOG_HBTN_CHF)
		for (i = 0; i < 4; i++)
			input_report_key(dev, analog->buttons[j++], (buttons >> (i + 10)) & 1);

	if (analog->mask & ANALOG_BTN_TL)
		input_report_key(dev, analog_pads[0], axes[2] < (initial[2] >> 1));
	if (analog->mask & ANALOG_BTN_TR)
		input_report_key(dev, analog_pads[1], axes[3] < (initial[3] >> 1));
	if (analog->mask & ANALOG_BTN_TL2)
		input_report_key(dev, analog_pads[2], axes[2] > (initial[2] + (initial[2] >> 1)));
	if (analog->mask & ANALOG_BTN_TR2)
		input_report_key(dev, analog_pads[3], axes[3] > (initial[3] + (initial[3] >> 1)));

	for (i = j = 0; i < 4; i++)
		if (analog->mask & (1 << i))
			input_report_abs(dev, analog_axes[j++], axes[i]);

	for (i = j = 0; i < 3; i++)
		if (analog->mask & analog_exts[i]) {
			input_report_abs(dev, analog_hats[j++],
				((buttons >> ((i << 2) + 7)) & 1) - ((buttons >> ((i << 2) + 9)) & 1));
			input_report_abs(dev, analog_hats[j++],
				((buttons >> ((i << 2) + 8)) & 1) - ((buttons >> ((i << 2) + 6)) & 1));
		}

	input_sync(dev);
}

/*
 * analog_cooked_read() reads analog joystick data.
 */

static int analog_cooked_read(struct analog_port *port)
{
	struct gameport *gameport = port->gameport;
	unsigned int time[4], start, loop, now, loopout, timeout;
	unsigned char data[4], this, last;
	unsigned long flags;
	int i, j;

	loopout = (ANALOG_LOOP_TIME * port->loop) / 1000;
	timeout = ANALOG_MAX_TIME * port->speed;

	local_irq_save(flags);
	gameport_trigger(gameport);
	GET_TIME(now);
	local_irq_restore(flags);

	start = now;
	this = port->mask;
	i = 0;

	do {
		loop = now;
		last = this;

		local_irq_disable();
		this = gameport_read(gameport) & port->mask;
		GET_TIME(now);
		local_irq_restore(flags);

		if ((last ^ this) && (DELTA(loop, now) < loopout)) {
			data[i] = last ^ this;
			time[i] = now;
			i++;
		}

	} while (this && (i < 4) && (DELTA(start, now) < timeout));

	this <<= 4;

	for (--i; i >= 0; i--) {
		this |= data[i];
		for (j = 0; j < 4; j++)
			if (data[i] & (1 << j))
				port->axes[j] = (DELTA(start, time[i]) << ANALOG_FUZZ_BITS) / port->loop;
	}

	return -(this != port->mask);
}

static int analog_button_read(struct analog_port *port, char saitek, char chf)
{
	unsigned char u;
	int t = 1, i = 0;
	int strobe = gameport_time(port->gameport, ANALOG_SAITEK_TIME);

	u = gameport_read(port->gameport);

	if (!chf) {
		port->buttons = (~u >> 4) & 0xf;
		return 0;
	}

	port->buttons = 0;

	while ((~u & 0xf0) && (i < 16) && t) {
		port->buttons |= 1 << analog_chf[(~u >> 4) & 0xf];
		if (!saitek) return 0;
		udelay(ANALOG_SAITEK_DELAY);
		t = strobe;
		gameport_trigger(port->gameport);
		while (((u = gameport_read(port->gameport)) & port->mask) && t) t--;
		i++;
	}

	return -(!t || (i == 16));
}

/*
 * analog_poll() repeatedly polls the Analog joysticks.
 */

static void analog_poll(struct gameport *gameport)
{
	struct analog_port *port = gameport_get_drvdata(gameport);
	int i;

	char saitek = !!(port->analog[0].mask & ANALOG_SAITEK);
	char chf = !!(port->analog[0].mask & ANALOG_ANY_CHF);

	if (port->cooked) {
		port->bads -= gameport_cooked_read(port->gameport, port->axes, &port->buttons);
		if (chf)
			port->buttons = port->buttons ? (1 << analog_chf[port->buttons]) : 0;
		port->reads++;
	} else {
		if (!port->axtime--) {
			port->bads -= analog_cooked_read(port);
			port->bads -= analog_button_read(port, saitek, chf);
			port->reads++;
			port->axtime = ANALOG_AXIS_TIME - 1;
		} else {
			if (!saitek)
				analog_button_read(port, saitek, chf);
		}
	}

	for (i = 0; i < 2; i++)
		if (port->analog[i].mask)
			analog_decode(port->analog + i, port->axes, port->initial, port->buttons);
}

/*
 * analog_open() is a callback from the input open routine.
 */

static int analog_open(struct input_dev *dev)
{
	struct analog_port *port = input_get_drvdata(dev);

	gameport_start_polling(port->gameport);
	return 0;
}

/*
 * analog_close() is a callback from the input close routine.
 */

static void analog_close(struct input_dev *dev)
{
	struct analog_port *port = input_get_drvdata(dev);

	gameport_stop_polling(port->gameport);
}

/*
 * analog_calibrate_timer() calibrates the timer and computes loop
 * and timeout values for a joystick port.
 */

static void analog_calibrate_timer(struct analog_port *port)
{
	struct gameport *gameport = port->gameport;
	unsigned int i, t, tx, t1, t2, t3;
	unsigned long flags;

	local_irq_save(flags);
	GET_TIME(t1);
#ifdef FAKE_TIME
	analog_faketime += 830;
#endif
	mdelay(1);
	GET_TIME(t2);
	GET_TIME(t3);
	local_irq_restore(flags);

	port->speed = DELTA(t1, t2) - DELTA(t2, t3);

	tx = ~0;

	for (i = 0; i < 50; i++) {
		local_irq_save(flags);
		GET_TIME(t1);
		for (t = 0; t < 50; t++) { gameport_read(gameport); GET_TIME(t2); }
		GET_TIME(t3);
		local_irq_restore(flags);
		udelay(i);
		t = DELTA(t1, t2) - DELTA(t2, t3);
		if (t < tx) tx = t;
	}

        port->loop = tx / 50;
}

/*
 * analog_name() constructs a name for an analog joystick.
 */

static void analog_name(struct analog *analog)
{
	snprintf(analog->name, sizeof(analog->name), "Analog %d-axis %d-button",
		 hweight8(analog->mask & ANALOG_AXES_STD),
		 hweight8(analog->mask & ANALOG_BTNS_STD) + !!(analog->mask & ANALOG_BTNS_CHF) * 2 +
		 hweight16(analog->mask & ANALOG_BTNS_GAMEPAD) + !!(analog->mask & ANALOG_HBTN_CHF) * 4);

	if (analog->mask & ANALOG_HATS_ALL)
		snprintf(analog->name, sizeof(analog->name), "%s %d-hat",
			 analog->name, hweight16(analog->mask & ANALOG_HATS_ALL));

	if (analog->mask & ANALOG_HAT_FCS)
		strlcat(analog->name, " FCS", sizeof(analog->name));
	if (analog->mask & ANALOG_ANY_CHF)
		strlcat(analog->name, (analog->mask & ANALOG_SAITEK) ? " Saitek" : " CHF",
			sizeof(analog->name));

	strlcat(analog->name, (analog->mask & ANALOG_GAMEPAD) ? " gamepad": " joystick",
		sizeof(analog->name));
}

/*
 * analog_init_device()
 */

static int analog_init_device(struct analog_port *port, struct analog *analog, int index)
{
	struct input_dev *input_dev;
	int i, j, t, v, w, x, y, z;
	int error;

	analog_name(analog);
	snprintf(analog->phys, sizeof(analog->phys),
		 "%s/input%d", port->gameport->phys, index);
	analog->buttons = (analog->mask & ANALOG_GAMEPAD) ? analog_pad_btn : analog_joy_btn;

	analog->dev = input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

	input_dev->name = analog->name;
	input_dev->phys = analog->phys;
	input_dev->id.bustype = BUS_GAMEPORT;
	input_dev->id.vendor = GAMEPORT_ID_VENDOR_ANALOG;
	input_dev->id.product = analog->mask >> 4;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &port->gameport->dev;

	input_set_drvdata(input_dev, port);

	input_dev->open = analog_open;
	input_dev->close = analog_close;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	for (i = j = 0; i < 4; i++)
		if (analog->mask & (1 << i)) {

			t = analog_axes[j];
			x = port->axes[i];
			y = (port->axes[0] + port->axes[1]) >> 1;
			z = y - port->axes[i];
			z = z > 0 ? z : -z;
			v = (x >> 3);
			w = (x >> 3);

			if ((i == 2 || i == 3) && (j == 2 || j == 3) && (z > (y >> 3)))
				x = y;

			if (analog->mask & ANALOG_SAITEK) {
				if (i == 2) x = port->axes[i];
				v = x - (x >> 2);
				w = (x >> 4);
			}

			input_set_abs_params(input_dev, t, v, (x << 1) - v, port->fuzz, w);
			j++;
		}

	for (i = j = 0; i < 3; i++)
		if (analog->mask & analog_exts[i])
			for (x = 0; x < 2; x++) {
				t = analog_hats[j++];
				input_set_abs_params(input_dev, t, -1, 1, 0, 0);
			}

	for (i = j = 0; i < 4; i++)
		if (analog->mask & (0x10 << i))
			set_bit(analog->buttons[j++], input_dev->keybit);

	if (analog->mask & ANALOG_BTNS_CHF)
		for (i = 0; i < 2; i++)
			set_bit(analog->buttons[j++], input_dev->keybit);

	if (analog->mask & ANALOG_HBTN_CHF)
		for (i = 0; i < 4; i++)
			set_bit(analog->buttons[j++], input_dev->keybit);

	for (i = 0; i < 4; i++)
		if (analog->mask & (ANALOG_BTN_TL << i))
			set_bit(analog_pads[i], input_dev->keybit);

	analog_decode(analog, port->axes, port->initial, port->buttons);

	error = input_register_device(analog->dev);
	if (error) {
		input_free_device(analog->dev);
		return error;
	}

	return 0;
}

/*
 * analog_init_devices() sets up device-specific values and registers the input devices.
 */

static int analog_init_masks(struct analog_port *port)
{
	int i;
	struct analog *analog = port->analog;
	int max[4];

	if (!port->mask)
		return -1;

	if ((port->mask & 3) != 3 && port->mask != 0xc) {
		printk(KERN_WARNING "analog.c: Unknown joystick device found  "
			"(data=%#x, %s), probably not analog joystick.\n",
			port->mask, port->gameport->phys);
		return -1;
	}


	i = analog_options[0]; /* FIXME !!! - need to specify options for different ports */

	analog[0].mask = i & 0xfffff;

	analog[0].mask &= ~(ANALOG_AXES_STD | ANALOG_HAT_FCS | ANALOG_BTNS_GAMEPAD)
			| port->mask | ((port->mask << 8) & ANALOG_HAT_FCS)
			| ((port->mask << 10) & ANALOG_BTNS_TLR) | ((port->mask << 12) & ANALOG_BTNS_TLR2);

	analog[0].mask &= ~(ANALOG_HAT2_CHF)
			| ((analog[0].mask & ANALOG_HBTN_CHF) ? 0 : ANALOG_HAT2_CHF);

	analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_BTN_TR | ANALOG_BTN_TR2)
			| ((~analog[0].mask & ANALOG_HAT_FCS) >> 8)
			| ((~analog[0].mask & ANALOG_HAT_FCS) << 2)
			| ((~analog[0].mask & ANALOG_HAT_FCS) << 4);

	analog[0].mask &= ~(ANALOG_THROTTLE | ANALOG_RUDDER)
			| (((~analog[0].mask & ANALOG_BTNS_TLR ) >> 10)
			&  ((~analog[0].mask & ANALOG_BTNS_TLR2) >> 12));

	analog[1].mask = ((i >> 20) & 0xff) | ((i >> 12) & 0xf0000);

	analog[1].mask &= (analog[0].mask & ANALOG_EXTENSIONS) ? ANALOG_GAMEPAD
			: (((ANALOG_BTNS_STD | port->mask) & ~analog[0].mask) | ANALOG_GAMEPAD);

	if (port->cooked) {

		for (i = 0; i < 4; i++) max[i] = port->axes[i] << 1;

		if ((analog[0].mask & 0x7) == 0x7) max[2] = (max[0] + max[1]) >> 1;
		if ((analog[0].mask & 0xb) == 0xb) max[3] = (max[0] + max[1]) >> 1;
		if ((analog[0].mask & ANALOG_BTN_TL) && !(analog[0].mask & ANALOG_BTN_TL2)) max[2] >>= 1;
		if ((analog[0].mask & ANALOG_BTN_TR) && !(analog[0].mask & ANALOG_BTN_TR2)) max[3] >>= 1;
		if ((analog[0].mask & ANALOG_HAT_FCS)) max[3] >>= 1;

		gameport_calibrate(port->gameport, port->axes, max);
	}

	for (i = 0; i < 4; i++)
		port->initial[i] = port->axes[i];

	return -!(analog[0].mask || analog[1].mask);
}

static int analog_init_port(struct gameport *gameport, struct gameport_driver *drv, struct analog_port *port)
{
	int i, t, u, v;

	port->gameport = gameport;

	gameport_set_drvdata(gameport, port);

	if (!gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {

		analog_calibrate_timer(port);

		gameport_trigger(gameport);
		t = gameport_read(gameport);
		msleep(ANALOG_MAX_TIME);
		port->mask = (gameport_read(gameport) ^ t) & t & 0xf;
		port->fuzz = (port->speed * ANALOG_FUZZ_MAGIC) / port->loop / 1000 + ANALOG_FUZZ_BITS;

		for (i = 0; i < ANALOG_INIT_RETRIES; i++) {
			if (!analog_cooked_read(port))
				break;
			msleep(ANALOG_MAX_TIME);
		}

		u = v = 0;

		msleep(ANALOG_MAX_TIME);
		t = gameport_time(gameport, ANALOG_MAX_TIME * 1000);
		gameport_trigger(gameport);
		while ((gameport_read(port->gameport) & port->mask) && (u < t))
			u++;
		udelay(ANALOG_SAITEK_DELAY);
		t = gameport_time(gameport, ANALOG_SAITEK_TIME);
		gameport_trigger(gameport);
		while ((gameport_read(port->gameport) & port->mask) && (v < t))
			v++;

		if (v < (u >> 1)) { /* FIXME - more than one port */
			analog_options[0] |= /* FIXME - more than one port */
				ANALOG_SAITEK | ANALOG_BTNS_CHF | ANALOG_HBTN_CHF | ANALOG_HAT1_CHF;
			return 0;
		}

		gameport_close(gameport);
	}

	if (!gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {

		for (i = 0; i < ANALOG_INIT_RETRIES; i++)
			if (!gameport_cooked_read(gameport, port->axes, &port->buttons))
				break;
		for (i = 0; i < 4; i++)
			if (port->axes[i] != -1)
				port->mask |= 1 << i;

		port->fuzz = gameport->fuzz;
		port->cooked = 1;
		return 0;
	}

	return gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
}

static int analog_connect(struct gameport *gameport, struct gameport_driver *drv)
{
	struct analog_port *port;
	int i;
	int err;

	if (!(port = kzalloc(sizeof(struct analog_port), GFP_KERNEL)))
		return - ENOMEM;

	err = analog_init_port(gameport, drv, port);
	if (err)
		goto fail1;

	err = analog_init_masks(port);
	if (err)
		goto fail2;

	gameport_set_poll_handler(gameport, analog_poll);
	gameport_set_poll_interval(gameport, 10);

	for (i = 0; i < 2; i++)
		if (port->analog[i].mask) {
			err = analog_init_device(port, port->analog + i, i);
			if (err)
				goto fail3;
		}

	return 0;

 fail3: while (--i >= 0)
		if (port->analog[i].mask)
			input_unregister_device(port->analog[i].dev);
 fail2:	gameport_close(gameport);
 fail1:	gameport_set_drvdata(gameport, NULL);
	kfree(port);
	return err;
}

static void analog_disconnect(struct gameport *gameport)
{
	struct analog_port *port = gameport_get_drvdata(gameport);
	int i;

	for (i = 0; i < 2; i++)
		if (port->analog[i].mask)
			input_unregister_device(port->analog[i].dev);
	gameport_close(gameport);
	gameport_set_drvdata(gameport, NULL);
	printk(KERN_INFO "analog.c: %d out of %d reads (%d%%) on %s failed\n",
		port->bads, port->reads, port->reads ? (port->bads * 100 / port->reads) : 0,
		port->gameport->phys);
	kfree(port);
}

struct analog_types {
	char *name;
	int value;
};

static struct analog_types analog_types[] = {
	{ "none",	0x00000000 },
	{ "auto",	0x000000ff },
	{ "2btn",	0x0000003f },
	{ "y-joy",	0x0cc00033 },
	{ "y-pad",	0x8cc80033 },
	{ "fcs",	0x000008f7 },
	{ "chf",	0x000002ff },
	{ "fullchf",	0x000007ff },
	{ "gamepad",	0x000830f3 },
	{ "gamepad8",	0x0008f0f3 },
	{ NULL, 0 }
};

static void analog_parse_options(void)
{
	int i, j;
	char *end;

	for (i = 0; i < js_nargs; i++) {

		for (j = 0; analog_types[j].name; j++)
			if (!strcmp(analog_types[j].name, js[i])) {
				analog_options[i] = analog_types[j].value;
				break;
			}
		if (analog_types[j].name) continue;

		analog_options[i] = simple_strtoul(js[i], &end, 0);
		if (end != js[i]) continue;

		analog_options[i] = 0xff;
		if (!strlen(js[i])) continue;

		printk(KERN_WARNING "analog.c: Bad config for port %d - \"%s\"\n", i, js[i]);
	}

	for (; i < ANALOG_PORTS; i++)
		analog_options[i] = 0xff;
}

/*
 * The gameport device structure.
 */

static struct gameport_driver analog_drv = {
	.driver		= {
		.name	= "analog",
	},
	.description	= DRIVER_DESC,
	.connect	= analog_connect,
	.disconnect	= analog_disconnect,
};

static int __init analog_init(void)
{
	analog_parse_options();
	gameport_register_driver(&analog_drv);

	return 0;
}

static void __exit analog_exit(void)
{
	gameport_unregister_driver(&analog_drv);
}

module_init(analog_init);
module_exit(analog_exit);