summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-wiimote-ext.c
blob: 0472191d4a7272dff8ea9709aef2e7814dd6be2a (plain)
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
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
/*
 * HID driver for Nintendo Wiimote extension devices
 * Copyright (c) 2011 David Herrmann
 */

/*
 * 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.
 */

#include <linux/atomic.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include "hid-wiimote.h"

struct wiimote_ext {
	struct wiimote_data *wdata;
	struct work_struct worker;
	struct input_dev *input;
	struct input_dev *mp_input;

	atomic_t opened;
	atomic_t mp_opened;
	bool plugged;
	bool mp_plugged;
	bool motionp;
	__u8 ext_type;
	__u16 calib[4][3];
};

enum wiiext_type {
	WIIEXT_NONE,		/* placeholder */
	WIIEXT_CLASSIC,		/* Nintendo classic controller */
	WIIEXT_NUNCHUCK,	/* Nintendo nunchuck controller */
	WIIEXT_BALANCE_BOARD,	/* Nintendo balance board controller */
};

enum wiiext_keys {
	WIIEXT_KEY_C,
	WIIEXT_KEY_Z,
	WIIEXT_KEY_A,
	WIIEXT_KEY_B,
	WIIEXT_KEY_X,
	WIIEXT_KEY_Y,
	WIIEXT_KEY_ZL,
	WIIEXT_KEY_ZR,
	WIIEXT_KEY_PLUS,
	WIIEXT_KEY_MINUS,
	WIIEXT_KEY_HOME,
	WIIEXT_KEY_LEFT,
	WIIEXT_KEY_RIGHT,
	WIIEXT_KEY_UP,
	WIIEXT_KEY_DOWN,
	WIIEXT_KEY_LT,
	WIIEXT_KEY_RT,
	WIIEXT_KEY_COUNT
};

static __u16 wiiext_keymap[] = {
	BTN_C,		/* WIIEXT_KEY_C */
	BTN_Z,		/* WIIEXT_KEY_Z */
	BTN_A,		/* WIIEXT_KEY_A */
	BTN_B,		/* WIIEXT_KEY_B */
	BTN_X,		/* WIIEXT_KEY_X */
	BTN_Y,		/* WIIEXT_KEY_Y */
	BTN_TL2,	/* WIIEXT_KEY_ZL */
	BTN_TR2,	/* WIIEXT_KEY_ZR */
	KEY_NEXT,	/* WIIEXT_KEY_PLUS */
	KEY_PREVIOUS,	/* WIIEXT_KEY_MINUS */
	BTN_MODE,	/* WIIEXT_KEY_HOME */
	KEY_LEFT,	/* WIIEXT_KEY_LEFT */
	KEY_RIGHT,	/* WIIEXT_KEY_RIGHT */
	KEY_UP,		/* WIIEXT_KEY_UP */
	KEY_DOWN,	/* WIIEXT_KEY_DOWN */
	BTN_TL,		/* WIIEXT_KEY_LT */
	BTN_TR,		/* WIIEXT_KEY_RT */
};

/* disable all extensions */
static void ext_disable(struct wiimote_ext *ext)
{
	unsigned long flags;
	__u8 wmem = 0x55;

	if (!wiimote_cmd_acquire(ext->wdata)) {
		wiimote_cmd_write(ext->wdata, 0xa400f0, &wmem, sizeof(wmem));
		wiimote_cmd_release(ext->wdata);
	}

	spin_lock_irqsave(&ext->wdata->state.lock, flags);
	ext->motionp = false;
	ext->ext_type = WIIEXT_NONE;
	wiiproto_req_drm(ext->wdata, WIIPROTO_REQ_NULL);
	spin_unlock_irqrestore(&ext->wdata->state.lock, flags);
}

static bool motionp_read(struct wiimote_ext *ext)
{
	__u8 rmem[2], wmem;
	ssize_t ret;
	bool avail = false;

	if (!atomic_read(&ext->mp_opened))
		return false;

	if (wiimote_cmd_acquire(ext->wdata))
		return false;

	/* initialize motion plus */
	wmem = 0x55;
	ret = wiimote_cmd_write(ext->wdata, 0xa600f0, &wmem, sizeof(wmem));
	if (ret)
		goto error;

	/* read motion plus ID */
	ret = wiimote_cmd_read(ext->wdata, 0xa600fe, rmem, 2);
	if (ret == 2 || rmem[1] == 0x5)
		avail = true;

error:
	wiimote_cmd_release(ext->wdata);
	return avail;
}

static __u8 ext_read(struct wiimote_ext *ext)
{
	ssize_t ret;
	__u8 buf[24], i, j, offs = 0;
	__u8 rmem[2], wmem;
	__u8 type = WIIEXT_NONE;

	if (!ext->plugged || !atomic_read(&ext->opened))
		return WIIEXT_NONE;

	if (wiimote_cmd_acquire(ext->wdata))
		return WIIEXT_NONE;

	/* initialize extension */
	wmem = 0x55;
	ret = wiimote_cmd_write(ext->wdata, 0xa400f0, &wmem, sizeof(wmem));
	if (!ret) {
		/* disable encryption */
		wmem = 0x0;
		wiimote_cmd_write(ext->wdata, 0xa400fb, &wmem, sizeof(wmem));
	}

	/* read extension ID */
	ret = wiimote_cmd_read(ext->wdata, 0xa400fe, rmem, 2);
	if (ret == 2) {
		if (rmem[0] == 0 && rmem[1] == 0)
			type = WIIEXT_NUNCHUCK;
		else if (rmem[0] == 0x01 && rmem[1] == 0x01)
			type = WIIEXT_CLASSIC;
		else if (rmem[0] == 0x04 && rmem[1] == 0x02)
			type = WIIEXT_BALANCE_BOARD;
	}

	/* get balance board calibration data */
	if (type == WIIEXT_BALANCE_BOARD) {
		ret = wiimote_cmd_read(ext->wdata, 0xa40024, buf, 12);
		ret += wiimote_cmd_read(ext->wdata, 0xa40024 + 12,
					buf + 12, 12);

		if (ret != 24) {
			type = WIIEXT_NONE;
		} else {
			for (i = 0; i < 3; i++) {
				for (j = 0; j < 4; j++) {
					ext->calib[j][i] = buf[offs];
					ext->calib[j][i] <<= 8;
					ext->calib[j][i] |= buf[offs + 1];
					offs += 2;
				}
			}
		}
	}

	wiimote_cmd_release(ext->wdata);

	return type;
}

static void ext_enable(struct wiimote_ext *ext, bool motionp, __u8 ext_type)
{
	unsigned long flags;
	__u8 wmem;
	int ret;

	if (motionp) {
		if (wiimote_cmd_acquire(ext->wdata))
			return;

		if (ext_type == WIIEXT_CLASSIC)
			wmem = 0x07;
		else if (ext_type == WIIEXT_NUNCHUCK)
			wmem = 0x05;
		else
			wmem = 0x04;

		ret = wiimote_cmd_write(ext->wdata, 0xa600fe, &wmem, sizeof(wmem));
		wiimote_cmd_release(ext->wdata);
		if (ret)
			return;
	}

	spin_lock_irqsave(&ext->wdata->state.lock, flags);
	ext->motionp = motionp;
	ext->ext_type = ext_type;
	wiiproto_req_drm(ext->wdata, WIIPROTO_REQ_NULL);
	spin_unlock_irqrestore(&ext->wdata->state.lock, flags);
}

static void wiiext_worker(struct work_struct *work)
{
	struct wiimote_ext *ext = container_of(work, struct wiimote_ext,
									worker);
	bool motionp;
	__u8 ext_type;

	ext_disable(ext);
	motionp = motionp_read(ext);
	ext_type = ext_read(ext);
	ext_enable(ext, motionp, ext_type);
}

/* schedule work only once, otherwise mark for reschedule */
static void wiiext_schedule(struct wiimote_ext *ext)
{
	schedule_work(&ext->worker);
}

/*
 * Reacts on extension port events
 * Whenever the driver gets an event from the wiimote that an extension has been
 * plugged or unplugged, this funtion shall be called. It checks what extensions
 * are connected and initializes and activates them.
 * This can be called in atomic context. The initialization is done in a
 * separate worker thread. The state.lock spinlock must be held by the caller.
 */
void wiiext_event(struct wiimote_data *wdata, bool plugged)
{
	if (!wdata->ext)
		return;

	if (wdata->ext->plugged == plugged)
		return;

	wdata->ext->plugged = plugged;

	if (!plugged)
		wdata->ext->mp_plugged = false;

	/*
	 * We need to call wiiext_schedule(wdata->ext) here, however, the
	 * extension initialization logic is not fully understood and so
	 * automatic initialization is not supported, yet.
	 */
}

/*
 * Returns true if the current DRM mode should contain extension data and false
 * if there is no interest in extension data.
 * All supported extensions send 6 byte extension data so any DRM that contains
 * extension bytes is fine.
 * The caller must hold the state.lock spinlock.
 */
bool wiiext_active(struct wiimote_data *wdata)
{
	if (!wdata->ext)
		return false;

	return wdata->ext->motionp || wdata->ext->ext_type;
}

static void handler_motionp(struct wiimote_ext *ext, const __u8 *payload)
{
	__s32 x, y, z;
	bool plugged;

	/*        |   8    7    6    5    4    3 |  2  |  1  |
	 *   -----+------------------------------+-----+-----+
	 *    1   |               Yaw Speed <7:0>            |
	 *    2   |              Roll Speed <7:0>            |
	 *    3   |             Pitch Speed <7:0>            |
	 *   -----+------------------------------+-----+-----+
	 *    4   |       Yaw Speed <13:8>       | Yaw |Pitch|
	 *   -----+------------------------------+-----+-----+
	 *    5   |      Roll Speed <13:8>       |Roll | Ext |
	 *   -----+------------------------------+-----+-----+
	 *    6   |     Pitch Speed <13:8>       |  1  |  0  |
	 *   -----+------------------------------+-----+-----+
	 * The single bits Yaw, Roll, Pitch in the lower right corner specify
	 * whether the wiimote is rotating fast (0) or slow (1). Speed for slow
	 * roation is 440 deg/s and for fast rotation 2000 deg/s. To get a
	 * linear scale we multiply by 2000/440 = ~4.5454 which is 18 for fast
	 * and 9 for slow.
	 * If the wiimote is not rotating the sensor reports 2^13 = 8192.
	 * Ext specifies whether an extension is connected to the motionp.
	 */

	x = payload[0];
	y = payload[1];
	z = payload[2];

	x |= (((__u16)payload[3]) << 6) & 0xff00;
	y |= (((__u16)payload[4]) << 6) & 0xff00;
	z |= (((__u16)payload[5]) << 6) & 0xff00;

	x -= 8192;
	y -= 8192;
	z -= 8192;

	if (!(payload[3] & 0x02))
		x *= 18;
	else
		x *= 9;
	if (!(payload[4] & 0x02))
		y *= 18;
	else
		y *= 9;
	if (!(payload[3] & 0x01))
		z *= 18;
	else
		z *= 9;

	input_report_abs(ext->mp_input, ABS_RX, x);
	input_report_abs(ext->mp_input, ABS_RY, y);
	input_report_abs(ext->mp_input, ABS_RZ, z);
	input_sync(ext->mp_input);

	plugged = payload[5] & 0x01;
	if (plugged != ext->mp_plugged)
		ext->mp_plugged = plugged;
}

static void handler_nunchuck(struct wiimote_ext *ext, const __u8 *payload)
{
	__s16 x, y, z, bx, by;

	/*   Byte |   8    7 |  6    5 |  4    3 |  2 |  1  |
	 *   -----+----------+---------+---------+----+-----+
	 *    1   |              Button X <7:0>             |
	 *    2   |              Button Y <7:0>             |
	 *   -----+----------+---------+---------+----+-----+
	 *    3   |               Speed X <9:2>             |
	 *    4   |               Speed Y <9:2>             |
	 *    5   |               Speed Z <9:2>             |
	 *   -----+----------+---------+---------+----+-----+
	 *    6   | Z <1:0>  | Y <1:0> | X <1:0> | BC | BZ  |
	 *   -----+----------+---------+---------+----+-----+
	 * Button X/Y is the analog stick. Speed X, Y and Z are the
	 * accelerometer data in the same format as the wiimote's accelerometer.
	 * The 6th byte contains the LSBs of the accelerometer data.
	 * BC and BZ are the C and Z buttons: 0 means pressed
	 *
	 * If reported interleaved with motionp, then the layout changes. The
	 * 5th and 6th byte changes to:
	 *   -----+-----------------------------------+-----+
	 *    5   |            Speed Z <9:3>          | EXT |
	 *   -----+--------+-----+-----+----+----+----+-----+
	 *    6   |Z <2:1> |Y <1>|X <1>| BC | BZ | 0  |  0  |
	 *   -----+--------+-----+-----+----+----+----+-----+
	 * All three accelerometer values lose their LSB. The other data is
	 * still available but slightly moved.
	 *
	 * Center data for button values is 128. Center value for accelerometer
	 * values it 512 / 0x200
	 */

	bx = payload[0];
	by = payload[1];
	bx -= 128;
	by -= 128;

	x = payload[2] << 2;
	y = payload[3] << 2;
	z = payload[4] << 2;

	if (ext->motionp) {
		x |= (payload[5] >> 3) & 0x02;
		y |= (payload[5] >> 4) & 0x02;
		z &= ~0x4;
		z |= (payload[5] >> 5) & 0x06;
	} else {
		x |= (payload[5] >> 2) & 0x03;
		y |= (payload[5] >> 4) & 0x03;
		z |= (payload[5] >> 6) & 0x03;
	}

	x -= 0x200;
	y -= 0x200;
	z -= 0x200;

	input_report_abs(ext->input, ABS_HAT0X, bx);
	input_report_abs(ext->input, ABS_HAT0Y, by);

	input_report_abs(ext->input, ABS_RX, x);
	input_report_abs(ext->input, ABS_RY, y);
	input_report_abs(ext->input, ABS_RZ, z);

	if (ext->motionp) {
		input_report_key(ext->input,
			wiiext_keymap[WIIEXT_KEY_Z], !(payload[5] & 0x04));
		input_report_key(ext->input,
			wiiext_keymap[WIIEXT_KEY_C], !(payload[5] & 0x08));
	} else {
		input_report_key(ext->input,
			wiiext_keymap[WIIEXT_KEY_Z], !(payload[5] & 0x01));
		input_report_key(ext->input,
			wiiext_keymap[WIIEXT_KEY_C], !(payload[5] & 0x02));
	}

	input_sync(ext->input);
}

static void handler_classic(struct wiimote_ext *ext, const __u8 *payload)
{
	__s8 rx, ry, lx, ly, lt, rt;

	/*   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 *    1   | RX <5:4>  |              LX <5:0>             |
	 *    2   | RX <3:2>  |              LY <5:0>             |
	 *   -----+-----+-----+-----+-----------------------------+
	 *    3   |RX<1>| LT <5:4>  |         RY <5:1>            |
	 *   -----+-----+-----------+-----------------------------+
	 *    4   |     LT <3:1>    |         RT <5:1>            |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 *    5   | BDR | BDD | BLT | B-  | BH  | B+  | BRT |  1  |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 *    6   | BZL | BB  | BY  | BA  | BX  | BZR | BDL | BDU |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 * All buttons are 0 if pressed
	 * RX and RY are right analog stick
	 * LX and LY are left analog stick
	 * LT is left trigger, RT is right trigger
	 * BLT is 0 if left trigger is fully pressed
	 * BRT is 0 if right trigger is fully pressed
	 * BDR, BDD, BDL, BDU form the D-Pad with right, down, left, up buttons
	 * BZL is left Z button and BZR is right Z button
	 * B-, BH, B+ are +, HOME and - buttons
	 * BB, BY, BA, BX are A, B, X, Y buttons
	 * LSB of RX, RY, LT, and RT are not transmitted and always 0.
	 *
	 * With motionp enabled it changes slightly to this:
	 *   Byte |  8  |  7  |  6  |  5  |  4  |  3  |  2  |  1  |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 *    1   | RX <4:3>  |          LX <5:1>           | BDU |
	 *    2   | RX <2:1>  |          LY <5:1>           | BDL |
	 *   -----+-----+-----+-----+-----------------------+-----+
	 *    3   |RX<0>| LT <4:3>  |         RY <4:0>            |
	 *   -----+-----+-----------+-----------------------------+
	 *    4   |     LT <2:0>    |         RT <4:0>            |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 *    5   | BDR | BDD | BLT | B-  | BH  | B+  | BRT | EXT |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 *    6   | BZL | BB  | BY  | BA  | BX  | BZR |  0  |  0  |
	 *   -----+-----+-----+-----+-----+-----+-----+-----+-----+
	 * Only the LSBs of LX and LY are lost. BDU and BDL are moved, the rest
	 * is the same as before.
	 */

	if (ext->motionp) {
		lx = payload[0] & 0x3e;
		ly = payload[0] & 0x3e;
	} else {
		lx = payload[0] & 0x3f;
		ly = payload[0] & 0x3f;
	}

	rx = (payload[0] >> 3) & 0x14;
	rx |= (payload[1] >> 5) & 0x06;
	rx |= (payload[2] >> 7) & 0x01;
	ry = payload[2] & 0x1f;

	rt = payload[3] & 0x1f;
	lt = (payload[2] >> 2) & 0x18;
	lt |= (payload[3] >> 5) & 0x07;

	rx <<= 1;
	ry <<= 1;
	rt <<= 1;
	lt <<= 1;

	input_report_abs(ext->input, ABS_HAT1X, lx - 0x20);
	input_report_abs(ext->input, ABS_HAT1Y, ly - 0x20);
	input_report_abs(ext->input, ABS_HAT2X, rx - 0x20);
	input_report_abs(ext->input, ABS_HAT2Y, ry - 0x20);
	input_report_abs(ext->input, ABS_HAT3X, rt - 0x20);
	input_report_abs(ext->input, ABS_HAT3Y, lt - 0x20);

	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_RIGHT],
							!!(payload[4] & 0x80));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_DOWN],
							!!(payload[4] & 0x40));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_LT],
							!!(payload[4] & 0x20));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_MINUS],
							!!(payload[4] & 0x10));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_HOME],
							!!(payload[4] & 0x08));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_PLUS],
							!!(payload[4] & 0x04));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_RT],
							!!(payload[4] & 0x02));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_ZL],
							!!(payload[5] & 0x80));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_B],
							!!(payload[5] & 0x40));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_Y],
							!!(payload[5] & 0x20));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_A],
							!!(payload[5] & 0x10));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_X],
							!!(payload[5] & 0x08));
	input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_ZR],
							!!(payload[5] & 0x04));

	if (ext->motionp) {
		input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_UP],
							!!(payload[0] & 0x01));
		input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_LEFT],
							!!(payload[1] & 0x01));
	} else {
		input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_UP],
							!!(payload[5] & 0x01));
		input_report_key(ext->input, wiiext_keymap[WIIEXT_KEY_LEFT],
							!!(payload[5] & 0x02));
	}

	input_sync(ext->input);
}

static void handler_balance_board(struct wiimote_ext *ext, const __u8 *payload)
{
	__s32 val[4], tmp;
	unsigned int i;

	/*   Byte |  8  7  6  5  4  3  2  1  |
	 *   -----+--------------------------+
	 *    1   |    Top Right <15:8>      |
	 *    2   |    Top Right  <7:0>      |
	 *   -----+--------------------------+
	 *    3   | Bottom Right <15:8>      |
	 *    4   | Bottom Right  <7:0>      |
	 *   -----+--------------------------+
	 *    5   |     Top Left <15:8>      |
	 *    6   |     Top Left  <7:0>      |
	 *   -----+--------------------------+
	 *    7   |  Bottom Left <15:8>      |
	 *    8   |  Bottom Left  <7:0>      |
	 *   -----+--------------------------+
	 *
	 * These values represent the weight-measurements of the Wii-balance
	 * board with 16bit precision.
	 *
	 * The balance-board is never reported interleaved with motionp.
	 */

	val[0] = payload[0];
	val[0] <<= 8;
	val[0] |= payload[1];

	val[1] = payload[2];
	val[1] <<= 8;
	val[1] |= payload[3];

	val[2] = payload[4];
	val[2] <<= 8;
	val[2] |= payload[5];

	val[3] = payload[6];
	val[3] <<= 8;
	val[3] |= payload[7];

	/* apply calibration data */
	for (i = 0; i < 4; i++) {
		if (val[i] < ext->calib[i][1]) {
			tmp = val[i] - ext->calib[i][0];
			tmp *= 1700;
			tmp /= ext->calib[i][1] - ext->calib[i][0];
		} else {
			tmp = val[i] - ext->calib[i][1];
			tmp *= 1700;
			tmp /= ext->calib[i][2] - ext->calib[i][1];
			tmp += 1700;
		}
		val[i] = tmp;
	}

	input_report_abs(ext->input, ABS_HAT0X, val[0]);
	input_report_abs(ext->input, ABS_HAT0Y, val[1]);
	input_report_abs(ext->input, ABS_HAT1X, val[2]);
	input_report_abs(ext->input, ABS_HAT1Y, val[3]);

	input_sync(ext->input);
}

/* call this with state.lock spinlock held */
void wiiext_handle(struct wiimote_data *wdata, const __u8 *payload)
{
	struct wiimote_ext *ext = wdata->ext;

	if (!ext)
		return;

	if (ext->motionp && (payload[5] & 0x02)) {
		handler_motionp(ext, payload);
	} else if (ext->ext_type == WIIEXT_NUNCHUCK) {
		handler_nunchuck(ext, payload);
	} else if (ext->ext_type == WIIEXT_CLASSIC) {
		handler_classic(ext, payload);
	} else if (ext->ext_type == WIIEXT_BALANCE_BOARD) {
		handler_balance_board(ext, payload);
	}
}

static ssize_t wiiext_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
	struct wiimote_data *wdata = dev_to_wii(dev);
	__u8 type = WIIEXT_NONE;
	bool motionp = false;
	unsigned long flags;

	spin_lock_irqsave(&wdata->state.lock, flags);
	if (wdata->ext) {
		motionp = wdata->ext->motionp;
		type = wdata->ext->ext_type;
	}
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	if (type == WIIEXT_NUNCHUCK) {
		if (motionp)
			return sprintf(buf, "motionp+nunchuck\n");
		else
			return sprintf(buf, "nunchuck\n");
	} else if (type == WIIEXT_CLASSIC) {
		if (motionp)
			return sprintf(buf, "motionp+classic\n");
		else
			return sprintf(buf, "classic\n");
	} else if (type == WIIEXT_BALANCE_BOARD) {
		if (motionp)
			return sprintf(buf, "motionp+balanceboard\n");
		else
			return sprintf(buf, "balanceboard\n");
	} else {
		if (motionp)
			return sprintf(buf, "motionp\n");
		else
			return sprintf(buf, "none\n");
	}
}

static DEVICE_ATTR(extension, S_IRUGO, wiiext_show, NULL);

static int wiiext_input_open(struct input_dev *dev)
{
	struct wiimote_ext *ext = input_get_drvdata(dev);
	int ret;

	ret = hid_hw_open(ext->wdata->hdev);
	if (ret)
		return ret;

	atomic_inc(&ext->opened);
	wiiext_schedule(ext);

	return 0;
}

static void wiiext_input_close(struct input_dev *dev)
{
	struct wiimote_ext *ext = input_get_drvdata(dev);

	atomic_dec(&ext->opened);
	wiiext_schedule(ext);
	hid_hw_close(ext->wdata->hdev);
}

static int wiiext_mp_open(struct input_dev *dev)
{
	struct wiimote_ext *ext = input_get_drvdata(dev);
	int ret;

	ret = hid_hw_open(ext->wdata->hdev);
	if (ret)
		return ret;

	atomic_inc(&ext->mp_opened);
	wiiext_schedule(ext);

	return 0;
}

static void wiiext_mp_close(struct input_dev *dev)
{
	struct wiimote_ext *ext = input_get_drvdata(dev);

	atomic_dec(&ext->mp_opened);
	wiiext_schedule(ext);
	hid_hw_close(ext->wdata->hdev);
}

/* Initializes the extension driver of a wiimote */
int wiiext_init(struct wiimote_data *wdata)
{
	struct wiimote_ext *ext;
	unsigned long flags;
	int ret, i;

	ext = kzalloc(sizeof(*ext), GFP_KERNEL);
	if (!ext)
		return -ENOMEM;

	ext->wdata = wdata;
	INIT_WORK(&ext->worker, wiiext_worker);

	ext->input = input_allocate_device();
	if (!ext->input) {
		ret = -ENOMEM;
		goto err_input;
	}

	input_set_drvdata(ext->input, ext);
	ext->input->open = wiiext_input_open;
	ext->input->close = wiiext_input_close;
	ext->input->dev.parent = &wdata->hdev->dev;
	ext->input->id.bustype = wdata->hdev->bus;
	ext->input->id.vendor = wdata->hdev->vendor;
	ext->input->id.product = wdata->hdev->product;
	ext->input->id.version = wdata->hdev->version;
	ext->input->name = WIIMOTE_NAME " Extension";

	set_bit(EV_KEY, ext->input->evbit);
	for (i = 0; i < WIIEXT_KEY_COUNT; ++i)
		set_bit(wiiext_keymap[i], ext->input->keybit);

	set_bit(EV_ABS, ext->input->evbit);
	set_bit(ABS_HAT0X, ext->input->absbit);
	set_bit(ABS_HAT0Y, ext->input->absbit);
	set_bit(ABS_HAT1X, ext->input->absbit);
	set_bit(ABS_HAT1Y, ext->input->absbit);
	set_bit(ABS_HAT2X, ext->input->absbit);
	set_bit(ABS_HAT2Y, ext->input->absbit);
	set_bit(ABS_HAT3X, ext->input->absbit);
	set_bit(ABS_HAT3Y, ext->input->absbit);
	input_set_abs_params(ext->input, ABS_HAT0X, -120, 120, 2, 4);
	input_set_abs_params(ext->input, ABS_HAT0Y, -120, 120, 2, 4);
	input_set_abs_params(ext->input, ABS_HAT1X, -30, 30, 1, 1);
	input_set_abs_params(ext->input, ABS_HAT1Y, -30, 30, 1, 1);
	input_set_abs_params(ext->input, ABS_HAT2X, -30, 30, 1, 1);
	input_set_abs_params(ext->input, ABS_HAT2Y, -30, 30, 1, 1);
	input_set_abs_params(ext->input, ABS_HAT3X, -30, 30, 1, 1);
	input_set_abs_params(ext->input, ABS_HAT3Y, -30, 30, 1, 1);
	set_bit(ABS_RX, ext->input->absbit);
	set_bit(ABS_RY, ext->input->absbit);
	set_bit(ABS_RZ, ext->input->absbit);
	input_set_abs_params(ext->input, ABS_RX, -500, 500, 2, 4);
	input_set_abs_params(ext->input, ABS_RY, -500, 500, 2, 4);
	input_set_abs_params(ext->input, ABS_RZ, -500, 500, 2, 4);

	ret = input_register_device(ext->input);
	if (ret) {
		input_free_device(ext->input);
		goto err_input;
	}

	ext->mp_input = input_allocate_device();
	if (!ext->mp_input) {
		ret = -ENOMEM;
		goto err_mp;
	}

	input_set_drvdata(ext->mp_input, ext);
	ext->mp_input->open = wiiext_mp_open;
	ext->mp_input->close = wiiext_mp_close;
	ext->mp_input->dev.parent = &wdata->hdev->dev;
	ext->mp_input->id.bustype = wdata->hdev->bus;
	ext->mp_input->id.vendor = wdata->hdev->vendor;
	ext->mp_input->id.product = wdata->hdev->product;
	ext->mp_input->id.version = wdata->hdev->version;
	ext->mp_input->name = WIIMOTE_NAME " Motion+";

	set_bit(EV_ABS, ext->mp_input->evbit);
	set_bit(ABS_RX, ext->mp_input->absbit);
	set_bit(ABS_RY, ext->mp_input->absbit);
	set_bit(ABS_RZ, ext->mp_input->absbit);
	input_set_abs_params(ext->mp_input, ABS_RX, -160000, 160000, 4, 8);
	input_set_abs_params(ext->mp_input, ABS_RY, -160000, 160000, 4, 8);
	input_set_abs_params(ext->mp_input, ABS_RZ, -160000, 160000, 4, 8);

	ret = input_register_device(ext->mp_input);
	if (ret) {
		input_free_device(ext->mp_input);
		goto err_mp;
	}

	ret = device_create_file(&wdata->hdev->dev, &dev_attr_extension);
	if (ret)
		goto err_dev;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wdata->ext = ext;
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	return 0;

err_dev:
	input_unregister_device(ext->mp_input);
err_mp:
	input_unregister_device(ext->input);
err_input:
	kfree(ext);
	return ret;
}

/* Deinitializes the extension driver of a wiimote */
void wiiext_deinit(struct wiimote_data *wdata)
{
	struct wiimote_ext *ext = wdata->ext;
	unsigned long flags;

	if (!ext)
		return;

	/*
	 * We first unset wdata->ext to avoid further input from the wiimote
	 * core. The worker thread does not access this pointer so it is not
	 * affected by this.
	 * We kill the worker after this so it does not get respawned during
	 * deinitialization.
	 */

	spin_lock_irqsave(&wdata->state.lock, flags);
	wdata->ext = NULL;
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	device_remove_file(&wdata->hdev->dev, &dev_attr_extension);
	input_unregister_device(ext->mp_input);
	input_unregister_device(ext->input);

	cancel_work_sync(&ext->worker);
	kfree(ext);
}