summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-wiimote.c
blob: de9aadf9218d206f8b68499b1c0900a6d4fd5fc7 (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
/*
 * HID driver for Nintendo Wiimote 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/device.h>
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include "hid-ids.h"

#define WIIMOTE_VERSION "0.1"
#define WIIMOTE_NAME "Nintendo Wii Remote"
#define WIIMOTE_BUFSIZE 32

struct wiimote_buf {
	__u8 data[HID_MAX_BUFFER_SIZE];
	size_t size;
};

struct wiimote_state {
	spinlock_t lock;
	__u8 flags;
	__u8 accel_split[2];
};

struct wiimote_data {
	struct hid_device *hdev;
	struct input_dev *input;
	struct led_classdev *leds[4];
	struct input_dev *accel;

	spinlock_t qlock;
	__u8 head;
	__u8 tail;
	struct wiimote_buf outq[WIIMOTE_BUFSIZE];
	struct work_struct worker;

	struct wiimote_state state;
};

#define WIIPROTO_FLAG_LED1		0x01
#define WIIPROTO_FLAG_LED2		0x02
#define WIIPROTO_FLAG_LED3		0x04
#define WIIPROTO_FLAG_LED4		0x08
#define WIIPROTO_FLAG_RUMBLE		0x10
#define WIIPROTO_FLAG_ACCEL		0x20
#define WIIPROTO_FLAGS_LEDS (WIIPROTO_FLAG_LED1 | WIIPROTO_FLAG_LED2 | \
					WIIPROTO_FLAG_LED3 | WIIPROTO_FLAG_LED4)

/* return flag for led \num */
#define WIIPROTO_FLAG_LED(num) (WIIPROTO_FLAG_LED1 << (num - 1))

enum wiiproto_reqs {
	WIIPROTO_REQ_NULL = 0x0,
	WIIPROTO_REQ_RUMBLE = 0x10,
	WIIPROTO_REQ_LED = 0x11,
	WIIPROTO_REQ_DRM = 0x12,
	WIIPROTO_REQ_STATUS = 0x20,
	WIIPROTO_REQ_RETURN = 0x22,
	WIIPROTO_REQ_DRM_K = 0x30,
	WIIPROTO_REQ_DRM_KA = 0x31,
	WIIPROTO_REQ_DRM_KAI = 0x33,
	WIIPROTO_REQ_DRM_KAE = 0x35,
	WIIPROTO_REQ_DRM_KAIE = 0x37,
	WIIPROTO_REQ_DRM_SKAI1 = 0x3e,
	WIIPROTO_REQ_DRM_SKAI2 = 0x3f,
};

enum wiiproto_keys {
	WIIPROTO_KEY_LEFT,
	WIIPROTO_KEY_RIGHT,
	WIIPROTO_KEY_UP,
	WIIPROTO_KEY_DOWN,
	WIIPROTO_KEY_PLUS,
	WIIPROTO_KEY_MINUS,
	WIIPROTO_KEY_ONE,
	WIIPROTO_KEY_TWO,
	WIIPROTO_KEY_A,
	WIIPROTO_KEY_B,
	WIIPROTO_KEY_HOME,
	WIIPROTO_KEY_COUNT
};

static __u16 wiiproto_keymap[] = {
	KEY_LEFT,	/* WIIPROTO_KEY_LEFT */
	KEY_RIGHT,	/* WIIPROTO_KEY_RIGHT */
	KEY_UP,		/* WIIPROTO_KEY_UP */
	KEY_DOWN,	/* WIIPROTO_KEY_DOWN */
	KEY_NEXT,	/* WIIPROTO_KEY_PLUS */
	KEY_PREVIOUS,	/* WIIPROTO_KEY_MINUS */
	BTN_1,		/* WIIPROTO_KEY_ONE */
	BTN_2,		/* WIIPROTO_KEY_TWO */
	BTN_A,		/* WIIPROTO_KEY_A */
	BTN_B,		/* WIIPROTO_KEY_B */
	BTN_MODE,	/* WIIPROTO_KEY_HOME */
};

static ssize_t wiimote_hid_send(struct hid_device *hdev, __u8 *buffer,
								size_t count)
{
	__u8 *buf;
	ssize_t ret;

	if (!hdev->hid_output_raw_report)
		return -ENODEV;

	buf = kmemdup(buffer, count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ret = hdev->hid_output_raw_report(hdev, buf, count, HID_OUTPUT_REPORT);

	kfree(buf);
	return ret;
}

static void wiimote_worker(struct work_struct *work)
{
	struct wiimote_data *wdata = container_of(work, struct wiimote_data,
									worker);
	unsigned long flags;

	spin_lock_irqsave(&wdata->qlock, flags);

	while (wdata->head != wdata->tail) {
		spin_unlock_irqrestore(&wdata->qlock, flags);
		wiimote_hid_send(wdata->hdev, wdata->outq[wdata->tail].data,
						wdata->outq[wdata->tail].size);
		spin_lock_irqsave(&wdata->qlock, flags);

		wdata->tail = (wdata->tail + 1) % WIIMOTE_BUFSIZE;
	}

	spin_unlock_irqrestore(&wdata->qlock, flags);
}

static void wiimote_queue(struct wiimote_data *wdata, const __u8 *buffer,
								size_t count)
{
	unsigned long flags;
	__u8 newhead;

	if (count > HID_MAX_BUFFER_SIZE) {
		hid_warn(wdata->hdev, "Sending too large output report\n");
		return;
	}

	/*
	 * Copy new request into our output queue and check whether the
	 * queue is full. If it is full, discard this request.
	 * If it is empty we need to start a new worker that will
	 * send out the buffer to the hid device.
	 * If the queue is not empty, then there must be a worker
	 * that is currently sending out our buffer and this worker
	 * will reschedule itself until the queue is empty.
	 */

	spin_lock_irqsave(&wdata->qlock, flags);

	memcpy(wdata->outq[wdata->head].data, buffer, count);
	wdata->outq[wdata->head].size = count;
	newhead = (wdata->head + 1) % WIIMOTE_BUFSIZE;

	if (wdata->head == wdata->tail) {
		wdata->head = newhead;
		schedule_work(&wdata->worker);
	} else if (newhead != wdata->tail) {
		wdata->head = newhead;
	} else {
		hid_warn(wdata->hdev, "Output queue is full");
	}

	spin_unlock_irqrestore(&wdata->qlock, flags);
}

/*
 * This sets the rumble bit on the given output report if rumble is
 * currently enabled.
 * \cmd1 must point to the second byte in the output report => &cmd[1]
 * This must be called on nearly every output report before passing it
 * into the output queue!
 */
static inline void wiiproto_keep_rumble(struct wiimote_data *wdata, __u8 *cmd1)
{
	if (wdata->state.flags & WIIPROTO_FLAG_RUMBLE)
		*cmd1 |= 0x01;
}

static void wiiproto_req_rumble(struct wiimote_data *wdata, __u8 rumble)
{
	__u8 cmd[2];

	rumble = !!rumble;
	if (rumble == !!(wdata->state.flags & WIIPROTO_FLAG_RUMBLE))
		return;

	if (rumble)
		wdata->state.flags |= WIIPROTO_FLAG_RUMBLE;
	else
		wdata->state.flags &= ~WIIPROTO_FLAG_RUMBLE;

	cmd[0] = WIIPROTO_REQ_RUMBLE;
	cmd[1] = 0;

	wiiproto_keep_rumble(wdata, &cmd[1]);
	wiimote_queue(wdata, cmd, sizeof(cmd));
}

static void wiiproto_req_leds(struct wiimote_data *wdata, int leds)
{
	__u8 cmd[2];

	leds &= WIIPROTO_FLAGS_LEDS;
	if ((wdata->state.flags & WIIPROTO_FLAGS_LEDS) == leds)
		return;
	wdata->state.flags = (wdata->state.flags & ~WIIPROTO_FLAGS_LEDS) | leds;

	cmd[0] = WIIPROTO_REQ_LED;
	cmd[1] = 0;

	if (leds & WIIPROTO_FLAG_LED1)
		cmd[1] |= 0x10;
	if (leds & WIIPROTO_FLAG_LED2)
		cmd[1] |= 0x20;
	if (leds & WIIPROTO_FLAG_LED3)
		cmd[1] |= 0x40;
	if (leds & WIIPROTO_FLAG_LED4)
		cmd[1] |= 0x80;

	wiiproto_keep_rumble(wdata, &cmd[1]);
	wiimote_queue(wdata, cmd, sizeof(cmd));
}

/*
 * Check what peripherals of the wiimote are currently
 * active and select a proper DRM that supports all of
 * the requested data inputs.
 */
static __u8 select_drm(struct wiimote_data *wdata)
{
	if (wdata->state.flags & WIIPROTO_FLAG_ACCEL)
		return WIIPROTO_REQ_DRM_KA;
	else
		return WIIPROTO_REQ_DRM_K;
}

static void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm)
{
	__u8 cmd[3];

	if (drm == WIIPROTO_REQ_NULL)
		drm = select_drm(wdata);

	cmd[0] = WIIPROTO_REQ_DRM;
	cmd[1] = 0;
	cmd[2] = drm;

	wiiproto_keep_rumble(wdata, &cmd[1]);
	wiimote_queue(wdata, cmd, sizeof(cmd));
}

static void wiiproto_req_accel(struct wiimote_data *wdata, __u8 accel)
{
	accel = !!accel;
	if (accel == !!(wdata->state.flags & WIIPROTO_FLAG_ACCEL))
		return;

	if (accel)
		wdata->state.flags |= WIIPROTO_FLAG_ACCEL;
	else
		wdata->state.flags &= ~WIIPROTO_FLAG_ACCEL;

	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
}

static enum led_brightness wiimote_leds_get(struct led_classdev *led_dev)
{
	struct wiimote_data *wdata;
	struct device *dev = led_dev->dev->parent;
	int i;
	unsigned long flags;
	bool value = false;

	wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));

	for (i = 0; i < 4; ++i) {
		if (wdata->leds[i] == led_dev) {
			spin_lock_irqsave(&wdata->state.lock, flags);
			value = wdata->state.flags & WIIPROTO_FLAG_LED(i + 1);
			spin_unlock_irqrestore(&wdata->state.lock, flags);
			break;
		}
	}

	return value ? LED_FULL : LED_OFF;
}

static void wiimote_leds_set(struct led_classdev *led_dev,
						enum led_brightness value)
{
	struct wiimote_data *wdata;
	struct device *dev = led_dev->dev->parent;
	int i;
	unsigned long flags;
	__u8 state, flag;

	wdata = hid_get_drvdata(container_of(dev, struct hid_device, dev));

	for (i = 0; i < 4; ++i) {
		if (wdata->leds[i] == led_dev) {
			flag = WIIPROTO_FLAG_LED(i + 1);
			spin_lock_irqsave(&wdata->state.lock, flags);
			state = wdata->state.flags;
			if (value == LED_OFF)
				wiiproto_req_leds(wdata, state & ~flag);
			else
				wiiproto_req_leds(wdata, state | flag);
			spin_unlock_irqrestore(&wdata->state.lock, flags);
			break;
		}
	}
}

static int wiimote_ff_play(struct input_dev *dev, void *data,
							struct ff_effect *eff)
{
	struct wiimote_data *wdata = input_get_drvdata(dev);
	__u8 value;
	unsigned long flags;

	/*
	 * The wiimote supports only a single rumble motor so if any magnitude
	 * is set to non-zero then we start the rumble motor. If both are set to
	 * zero, we stop the rumble motor.
	 */

	if (eff->u.rumble.strong_magnitude || eff->u.rumble.weak_magnitude)
		value = 1;
	else
		value = 0;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wiiproto_req_rumble(wdata, value);
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	return 0;
}

static int wiimote_input_open(struct input_dev *dev)
{
	struct wiimote_data *wdata = input_get_drvdata(dev);

	return hid_hw_open(wdata->hdev);
}

static void wiimote_input_close(struct input_dev *dev)
{
	struct wiimote_data *wdata = input_get_drvdata(dev);

	hid_hw_close(wdata->hdev);
}

static int wiimote_accel_open(struct input_dev *dev)
{
	struct wiimote_data *wdata = input_get_drvdata(dev);
	int ret;
	unsigned long flags;

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

	spin_lock_irqsave(&wdata->state.lock, flags);
	wiiproto_req_accel(wdata, true);
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	return 0;
}

static void wiimote_accel_close(struct input_dev *dev)
{
	struct wiimote_data *wdata = input_get_drvdata(dev);
	unsigned long flags;

	spin_lock_irqsave(&wdata->state.lock, flags);
	wiiproto_req_accel(wdata, false);
	spin_unlock_irqrestore(&wdata->state.lock, flags);

	hid_hw_close(wdata->hdev);
}

static void handler_keys(struct wiimote_data *wdata, const __u8 *payload)
{
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_LEFT],
							!!(payload[0] & 0x01));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_RIGHT],
							!!(payload[0] & 0x02));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_DOWN],
							!!(payload[0] & 0x04));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_UP],
							!!(payload[0] & 0x08));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_PLUS],
							!!(payload[0] & 0x10));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_TWO],
							!!(payload[1] & 0x01));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_ONE],
							!!(payload[1] & 0x02));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_B],
							!!(payload[1] & 0x04));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_A],
							!!(payload[1] & 0x08));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_MINUS],
							!!(payload[1] & 0x10));
	input_report_key(wdata->input, wiiproto_keymap[WIIPROTO_KEY_HOME],
							!!(payload[1] & 0x80));
	input_sync(wdata->input);
}

static void handler_accel(struct wiimote_data *wdata, const __u8 *payload)
{
	__u16 x, y, z;

	if (!(wdata->state.flags & WIIPROTO_FLAG_ACCEL))
		return;

	/*
	 * payload is: BB BB XX YY ZZ
	 * Accelerometer data is encoded into 3 10bit values. XX, YY and ZZ
	 * contain the upper 8 bits of each value. The lower 2 bits are
	 * contained in the buttons data BB BB.
	 * Bits 6 and 7 of the first buttons byte BB is the lower 2 bits of the
	 * X accel value. Bit 5 of the second buttons byte is the 2nd bit of Y
	 * accel value and bit 6 is the second bit of the Z value.
	 * The first bit of Y and Z values is not available and always set to 0.
	 * 0x200 is returned on no movement.
	 */

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

	x |= (payload[0] >> 5) & 0x3;
	y |= (payload[1] >> 4) & 0x2;
	z |= (payload[1] >> 5) & 0x2;

	input_report_abs(wdata->accel, ABS_RX, x - 0x200);
	input_report_abs(wdata->accel, ABS_RY, y - 0x200);
	input_report_abs(wdata->accel, ABS_RZ, z - 0x200);
	input_sync(wdata->accel);
}


static void handler_status(struct wiimote_data *wdata, const __u8 *payload)
{
	handler_keys(wdata, payload);

	/* on status reports the drm is reset so we need to resend the drm */
	wiiproto_req_drm(wdata, WIIPROTO_REQ_NULL);
}

static void handler_return(struct wiimote_data *wdata, const __u8 *payload)
{
	__u8 err = payload[3];
	__u8 cmd = payload[2];

	handler_keys(wdata, payload);

	if (err)
		hid_warn(wdata->hdev, "Remote error %hhu on req %hhu\n", err,
									cmd);
}

static void handler_drm_KA(struct wiimote_data *wdata, const __u8 *payload)
{
	handler_keys(wdata, payload);
	handler_accel(wdata, payload);
}

static void handler_drm_KAI(struct wiimote_data *wdata, const __u8 *payload)
{
	handler_keys(wdata, payload);
	handler_accel(wdata, payload);
}

static void handler_drm_KAE(struct wiimote_data *wdata, const __u8 *payload)
{
	handler_keys(wdata, payload);
	handler_accel(wdata, payload);
}

static void handler_drm_KAIE(struct wiimote_data *wdata, const __u8 *payload)
{
	handler_keys(wdata, payload);
	handler_accel(wdata, payload);
}

static void handler_drm_SKAI1(struct wiimote_data *wdata, const __u8 *payload)
{
	handler_keys(wdata, payload);

	wdata->state.accel_split[0] = payload[2];
	wdata->state.accel_split[1] = (payload[0] >> 1) & (0x10 | 0x20);
	wdata->state.accel_split[1] |= (payload[1] << 1) & (0x40 | 0x80);
}

static void handler_drm_SKAI2(struct wiimote_data *wdata, const __u8 *payload)
{
	__u8 buf[5];

	handler_keys(wdata, payload);

	wdata->state.accel_split[1] |= (payload[0] >> 5) & (0x01 | 0x02);
	wdata->state.accel_split[1] |= (payload[1] >> 3) & (0x04 | 0x08);

	buf[0] = 0;
	buf[1] = 0;
	buf[2] = wdata->state.accel_split[0];
	buf[3] = payload[2];
	buf[4] = wdata->state.accel_split[1];
	handler_accel(wdata, buf);
}

struct wiiproto_handler {
	__u8 id;
	size_t size;
	void (*func)(struct wiimote_data *wdata, const __u8 *payload);
};

static struct wiiproto_handler handlers[] = {
	{ .id = WIIPROTO_REQ_STATUS, .size = 6, .func = handler_status },
	{ .id = WIIPROTO_REQ_RETURN, .size = 4, .func = handler_return },
	{ .id = WIIPROTO_REQ_DRM_K, .size = 2, .func = handler_keys },
	{ .id = WIIPROTO_REQ_DRM_KA, .size = 5, .func = handler_drm_KA },
	{ .id = WIIPROTO_REQ_DRM_KAI, .size = 17, .func = handler_drm_KAI },
	{ .id = WIIPROTO_REQ_DRM_KAE, .size = 21, .func = handler_drm_KAE },
	{ .id = WIIPROTO_REQ_DRM_KAIE, .size = 21, .func = handler_drm_KAIE },
	{ .id = WIIPROTO_REQ_DRM_SKAI1, .size = 21, .func = handler_drm_SKAI1 },
	{ .id = WIIPROTO_REQ_DRM_SKAI2, .size = 21, .func = handler_drm_SKAI2 },
	{ .id = 0 }
};

static int wiimote_hid_event(struct hid_device *hdev, struct hid_report *report,
							u8 *raw_data, int size)
{
	struct wiimote_data *wdata = hid_get_drvdata(hdev);
	struct wiiproto_handler *h;
	int i;
	unsigned long flags;

	if (size < 1)
		return -EINVAL;

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

	for (i = 0; handlers[i].id; ++i) {
		h = &handlers[i];
		if (h->id == raw_data[0] && h->size < size)
			h->func(wdata, &raw_data[1]);
	}

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

	return 0;
}

static void wiimote_leds_destroy(struct wiimote_data *wdata)
{
	int i;
	struct led_classdev *led;

	for (i = 0; i < 4; ++i) {
		if (wdata->leds[i]) {
			led = wdata->leds[i];
			wdata->leds[i] = NULL;
			led_classdev_unregister(led);
			kfree(led);
		}
	}
}

static int wiimote_leds_create(struct wiimote_data *wdata)
{
	int i, ret;
	struct device *dev = &wdata->hdev->dev;
	size_t namesz = strlen(dev_name(dev)) + 9;
	struct led_classdev *led;
	char *name;

	for (i = 0; i < 4; ++i) {
		led = kzalloc(sizeof(struct led_classdev) + namesz, GFP_KERNEL);
		if (!led) {
			ret = -ENOMEM;
			goto err;
		}
		name = (void*)&led[1];
		snprintf(name, namesz, "%s:blue:p%d", dev_name(dev), i);
		led->name = name;
		led->brightness = 0;
		led->max_brightness = 1;
		led->brightness_get = wiimote_leds_get;
		led->brightness_set = wiimote_leds_set;

		ret = led_classdev_register(dev, led);
		if (ret) {
			kfree(led);
			goto err;
		}
		wdata->leds[i] = led;
	}

	return 0;

err:
	wiimote_leds_destroy(wdata);
	return ret;
}

static struct wiimote_data *wiimote_create(struct hid_device *hdev)
{
	struct wiimote_data *wdata;
	int i;

	wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
	if (!wdata)
		return NULL;

	wdata->input = input_allocate_device();
	if (!wdata->input)
		goto err;

	wdata->hdev = hdev;
	hid_set_drvdata(hdev, wdata);

	input_set_drvdata(wdata->input, wdata);
	wdata->input->open = wiimote_input_open;
	wdata->input->close = wiimote_input_close;
	wdata->input->dev.parent = &wdata->hdev->dev;
	wdata->input->id.bustype = wdata->hdev->bus;
	wdata->input->id.vendor = wdata->hdev->vendor;
	wdata->input->id.product = wdata->hdev->product;
	wdata->input->id.version = wdata->hdev->version;
	wdata->input->name = WIIMOTE_NAME;

	set_bit(EV_KEY, wdata->input->evbit);
	for (i = 0; i < WIIPROTO_KEY_COUNT; ++i)
		set_bit(wiiproto_keymap[i], wdata->input->keybit);

	set_bit(FF_RUMBLE, wdata->input->ffbit);
	if (input_ff_create_memless(wdata->input, NULL, wiimote_ff_play))
		goto err_input;

	wdata->accel = input_allocate_device();
	if (!wdata->accel)
		goto err_input;

	input_set_drvdata(wdata->accel, wdata);
	wdata->accel->open = wiimote_accel_open;
	wdata->accel->close = wiimote_accel_close;
	wdata->accel->dev.parent = &wdata->hdev->dev;
	wdata->accel->id.bustype = wdata->hdev->bus;
	wdata->accel->id.vendor = wdata->hdev->vendor;
	wdata->accel->id.product = wdata->hdev->product;
	wdata->accel->id.version = wdata->hdev->version;
	wdata->accel->name = WIIMOTE_NAME " Accelerometer";

	set_bit(EV_ABS, wdata->accel->evbit);
	set_bit(ABS_RX, wdata->accel->absbit);
	set_bit(ABS_RY, wdata->accel->absbit);
	set_bit(ABS_RZ, wdata->accel->absbit);
	input_set_abs_params(wdata->accel, ABS_RX, -500, 500, 2, 4);
	input_set_abs_params(wdata->accel, ABS_RY, -500, 500, 2, 4);
	input_set_abs_params(wdata->accel, ABS_RZ, -500, 500, 2, 4);

	spin_lock_init(&wdata->qlock);
	INIT_WORK(&wdata->worker, wiimote_worker);

	spin_lock_init(&wdata->state.lock);

	return wdata;

err_input:
	input_free_device(wdata->input);
err:
	kfree(wdata);
	return NULL;
}

static void wiimote_destroy(struct wiimote_data *wdata)
{
	wiimote_leds_destroy(wdata);

	input_unregister_device(wdata->accel);
	input_unregister_device(wdata->input);
	cancel_work_sync(&wdata->worker);
	hid_hw_stop(wdata->hdev);

	kfree(wdata);
}

static int wiimote_hid_probe(struct hid_device *hdev,
				const struct hid_device_id *id)
{
	struct wiimote_data *wdata;
	int ret;

	wdata = wiimote_create(hdev);
	if (!wdata) {
		hid_err(hdev, "Can't alloc device\n");
		return -ENOMEM;
	}

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "HID parse failed\n");
		goto err;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
	if (ret) {
		hid_err(hdev, "HW start failed\n");
		goto err;
	}

	ret = input_register_device(wdata->accel);
	if (ret) {
		hid_err(hdev, "Cannot register input device\n");
		goto err_stop;
	}

	ret = input_register_device(wdata->input);
	if (ret) {
		hid_err(hdev, "Cannot register input device\n");
		goto err_input;
	}

	ret = wiimote_leds_create(wdata);
	if (ret)
		goto err_free;

	hid_info(hdev, "New device registered\n");

	/* by default set led1 after device initialization */
	spin_lock_irq(&wdata->state.lock);
	wiiproto_req_leds(wdata, WIIPROTO_FLAG_LED1);
	spin_unlock_irq(&wdata->state.lock);

	return 0;

err_free:
	wiimote_destroy(wdata);
	return ret;

err_input:
	input_unregister_device(wdata->accel);
	wdata->accel = NULL;
err_stop:
	hid_hw_stop(hdev);
err:
	input_free_device(wdata->accel);
	input_free_device(wdata->input);
	kfree(wdata);
	return ret;
}

static void wiimote_hid_remove(struct hid_device *hdev)
{
	struct wiimote_data *wdata = hid_get_drvdata(hdev);

	hid_info(hdev, "Device removed\n");
	wiimote_destroy(wdata);
}

static const struct hid_device_id wiimote_hid_devices[] = {
	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NINTENDO,
				USB_DEVICE_ID_NINTENDO_WIIMOTE) },
	{ }
};
MODULE_DEVICE_TABLE(hid, wiimote_hid_devices);

static struct hid_driver wiimote_hid_driver = {
	.name = "wiimote",
	.id_table = wiimote_hid_devices,
	.probe = wiimote_hid_probe,
	.remove = wiimote_hid_remove,
	.raw_event = wiimote_hid_event,
};

static int __init wiimote_init(void)
{
	int ret;

	ret = hid_register_driver(&wiimote_hid_driver);
	if (ret)
		pr_err("Can't register wiimote hid driver\n");

	return ret;
}

static void __exit wiimote_exit(void)
{
	hid_unregister_driver(&wiimote_hid_driver);
}

module_init(wiimote_init);
module_exit(wiimote_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
MODULE_DESCRIPTION(WIIMOTE_NAME " Device Driver");
MODULE_VERSION(WIIMOTE_VERSION);
OpenPOWER on IntegriCloud