summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-prodikeys.c
blob: 21544ebff85545b5349e88b512d9e82f69484e9b (plain) (blame)
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
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  HID driver for the Prodikeys PC-MIDI Keyboard
 *  providing midi & extra multimedia keys functionality
 *
 *  Copyright (c) 2009 Don Prince <dhprince.devel@yahoo.co.uk>
 *
 *  Controls for Octave Shift Up/Down, Channel, and
 *  Sustain Duration available via sysfs.
 */

/*
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/device.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/mutex.h>
#include <linux/hid.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include "hid-ids.h"


#define pk_debug(format, arg...) \
	pr_debug("hid-prodikeys: " format "\n" , ## arg)
#define pk_error(format, arg...) \
	pr_err("hid-prodikeys: " format "\n" , ## arg)

struct pcmidi_snd;

struct pk_device {
	unsigned long		quirks;

	struct hid_device	*hdev;
	struct pcmidi_snd	*pm; /* pcmidi device context */
};

struct pcmidi_sustain {
	unsigned long		in_use;
	struct pcmidi_snd	*pm;
	struct timer_list	timer;
	unsigned char		status;
	unsigned char		note;
	unsigned char		velocity;
};

#define PCMIDI_SUSTAINED_MAX	32
struct pcmidi_snd {
	struct pk_device		*pk;
	unsigned short			ifnum;
	struct hid_report		*pcmidi_report6;
	struct input_dev		*input_ep82;
	unsigned short			midi_mode;
	unsigned short			midi_sustain_mode;
	unsigned short			midi_sustain;
	unsigned short			midi_channel;
	short				midi_octave;
	struct pcmidi_sustain		sustained_notes[PCMIDI_SUSTAINED_MAX];
	unsigned short			fn_state;
	unsigned short			last_key[24];
	spinlock_t			rawmidi_in_lock;
	struct snd_card			*card;
	struct snd_rawmidi		*rwmidi;
	struct snd_rawmidi_substream	*in_substream;
	struct snd_rawmidi_substream	*out_substream;
	unsigned long			in_triggered;
	unsigned long			out_active;
};

#define PK_QUIRK_NOGET	0x00010000
#define PCMIDI_MIDDLE_C 60
#define PCMIDI_CHANNEL_MIN 0
#define PCMIDI_CHANNEL_MAX 15
#define PCMIDI_OCTAVE_MIN (-2)
#define PCMIDI_OCTAVE_MAX 2
#define PCMIDI_SUSTAIN_MIN 0
#define PCMIDI_SUSTAIN_MAX 5000

static const char shortname[] = "PC-MIDI";
static const char longname[] = "Prodikeys PC-MIDI Keyboard";

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
module_param_array(id, charp, NULL, 0444);
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the PC-MIDI virtual audio driver");
MODULE_PARM_DESC(id, "ID string for the PC-MIDI virtual audio driver");
MODULE_PARM_DESC(enable, "Enable for the PC-MIDI virtual audio driver");


/* Output routine for the sysfs channel file */
static ssize_t show_channel(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct hid_device *hdev = to_hid_device(dev);
	struct pk_device *pk = hid_get_drvdata(hdev);

	dbg_hid("pcmidi sysfs read channel=%u\n", pk->pm->midi_channel);

	return sprintf(buf, "%u (min:%u, max:%u)\n", pk->pm->midi_channel,
		PCMIDI_CHANNEL_MIN, PCMIDI_CHANNEL_MAX);
}

/* Input routine for the sysfs channel file */
static ssize_t store_channel(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct hid_device *hdev = to_hid_device(dev);
	struct pk_device *pk = hid_get_drvdata(hdev);

	unsigned channel = 0;

	if (sscanf(buf, "%u", &channel) > 0 && channel <= PCMIDI_CHANNEL_MAX) {
		dbg_hid("pcmidi sysfs write channel=%u\n", channel);
		pk->pm->midi_channel = channel;
		return strlen(buf);
	}
	return -EINVAL;
}

static DEVICE_ATTR(channel, S_IRUGO | S_IWUSR | S_IWGRP , show_channel,
		store_channel);

static struct device_attribute *sysfs_device_attr_channel = {
		&dev_attr_channel,
		};

/* Output routine for the sysfs sustain file */
static ssize_t show_sustain(struct device *dev,
 struct device_attribute *attr, char *buf)
{
	struct hid_device *hdev = to_hid_device(dev);
	struct pk_device *pk = hid_get_drvdata(hdev);

	dbg_hid("pcmidi sysfs read sustain=%u\n", pk->pm->midi_sustain);

	return sprintf(buf, "%u (off:%u, max:%u (ms))\n", pk->pm->midi_sustain,
		PCMIDI_SUSTAIN_MIN, PCMIDI_SUSTAIN_MAX);
}

/* Input routine for the sysfs sustain file */
static ssize_t store_sustain(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct hid_device *hdev = to_hid_device(dev);
	struct pk_device *pk = hid_get_drvdata(hdev);

	unsigned sustain = 0;

	if (sscanf(buf, "%u", &sustain) > 0 && sustain <= PCMIDI_SUSTAIN_MAX) {
		dbg_hid("pcmidi sysfs write sustain=%u\n", sustain);
		pk->pm->midi_sustain = sustain;
		pk->pm->midi_sustain_mode =
			(0 == sustain || !pk->pm->midi_mode) ? 0 : 1;
		return strlen(buf);
	}
	return -EINVAL;
}

static DEVICE_ATTR(sustain, S_IRUGO | S_IWUSR | S_IWGRP, show_sustain,
		store_sustain);

static struct device_attribute *sysfs_device_attr_sustain = {
		&dev_attr_sustain,
		};

/* Output routine for the sysfs octave file */
static ssize_t show_octave(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	struct hid_device *hdev = to_hid_device(dev);
	struct pk_device *pk = hid_get_drvdata(hdev);

	dbg_hid("pcmidi sysfs read octave=%d\n", pk->pm->midi_octave);

	return sprintf(buf, "%d (min:%d, max:%d)\n", pk->pm->midi_octave,
		PCMIDI_OCTAVE_MIN, PCMIDI_OCTAVE_MAX);
}

/* Input routine for the sysfs octave file */
static ssize_t store_octave(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	struct hid_device *hdev = to_hid_device(dev);
	struct pk_device *pk = hid_get_drvdata(hdev);

	int octave = 0;

	if (sscanf(buf, "%d", &octave) > 0 &&
		octave >= PCMIDI_OCTAVE_MIN && octave <= PCMIDI_OCTAVE_MAX) {
		dbg_hid("pcmidi sysfs write octave=%d\n", octave);
		pk->pm->midi_octave = octave;
		return strlen(buf);
	}
	return -EINVAL;
}

static DEVICE_ATTR(octave, S_IRUGO | S_IWUSR | S_IWGRP, show_octave,
		store_octave);

static struct device_attribute *sysfs_device_attr_octave = {
		&dev_attr_octave,
		};


static void pcmidi_send_note(struct pcmidi_snd *pm,
	unsigned char status, unsigned char note, unsigned char velocity)
{
	unsigned long flags;
	unsigned char buffer[3];

	buffer[0] = status;
	buffer[1] = note;
	buffer[2] = velocity;

	spin_lock_irqsave(&pm->rawmidi_in_lock, flags);

	if (!pm->in_substream)
		goto drop_note;
	if (!test_bit(pm->in_substream->number, &pm->in_triggered))
		goto drop_note;

	snd_rawmidi_receive(pm->in_substream, buffer, 3);

drop_note:
	spin_unlock_irqrestore(&pm->rawmidi_in_lock, flags);

	return;
}

static void pcmidi_sustained_note_release(struct timer_list *t)
{
	struct pcmidi_sustain *pms = from_timer(pms, t, timer);

	pcmidi_send_note(pms->pm, pms->status, pms->note, pms->velocity);
	pms->in_use = 0;
}

static void init_sustain_timers(struct pcmidi_snd *pm)
{
	struct pcmidi_sustain *pms;
	unsigned i;

	for (i = 0; i < PCMIDI_SUSTAINED_MAX; i++) {
		pms = &pm->sustained_notes[i];
		pms->in_use = 0;
		pms->pm = pm;
		timer_setup(&pms->timer, pcmidi_sustained_note_release, 0);
	}
}

static void stop_sustain_timers(struct pcmidi_snd *pm)
{
	struct pcmidi_sustain *pms;
	unsigned i;

	for (i = 0; i < PCMIDI_SUSTAINED_MAX; i++) {
		pms = &pm->sustained_notes[i];
		pms->in_use = 1;
		del_timer_sync(&pms->timer);
	}
}

static int pcmidi_get_output_report(struct pcmidi_snd *pm)
{
	struct hid_device *hdev = pm->pk->hdev;
	struct hid_report *report;

	list_for_each_entry(report,
		&hdev->report_enum[HID_OUTPUT_REPORT].report_list, list) {
		if (!(6 == report->id))
			continue;

		if (report->maxfield < 1) {
			hid_err(hdev, "output report is empty\n");
			break;
		}
		if (report->field[0]->report_count != 2) {
			hid_err(hdev, "field count too low\n");
			break;
		}
		pm->pcmidi_report6 = report;
		return 0;
	}
	/* should never get here */
	return -ENODEV;
}

static void pcmidi_submit_output_report(struct pcmidi_snd *pm, int state)
{
	struct hid_device *hdev = pm->pk->hdev;
	struct hid_report *report = pm->pcmidi_report6;
	report->field[0]->value[0] = 0x01;
	report->field[0]->value[1] = state;

	hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
}

static int pcmidi_handle_report1(struct pcmidi_snd *pm, u8 *data)
{
	u32 bit_mask;

	bit_mask = data[1];
	bit_mask = (bit_mask << 8) | data[2];
	bit_mask = (bit_mask << 8) | data[3];

	dbg_hid("pcmidi mode: %d\n", pm->midi_mode);

	/*KEY_MAIL or octave down*/
	if (pm->midi_mode && bit_mask == 0x004000) {
		/* octave down */
		pm->midi_octave--;
		if (pm->midi_octave < -2)
			pm->midi_octave = -2;
		dbg_hid("pcmidi mode: %d octave: %d\n",
			pm->midi_mode, pm->midi_octave);
		return 1;
	}
	/*KEY_WWW or sustain*/
	else if (pm->midi_mode && bit_mask == 0x000004) {
		/* sustain on/off*/
		pm->midi_sustain_mode ^= 0x1;
		return 1;
	}

	return 0; /* continue key processing */
}

static int pcmidi_handle_report3(struct pcmidi_snd *pm, u8 *data, int size)
{
	struct pcmidi_sustain *pms;
	unsigned i, j;
	unsigned char status, note, velocity;

	unsigned num_notes = (size-1)/2;
	for (j = 0; j < num_notes; j++)	{
		note = data[j*2+1];
		velocity = data[j*2+2];

		if (note < 0x81) { /* note on */
			status = 128 + 16 + pm->midi_channel; /* 1001nnnn */
			note = note - 0x54 + PCMIDI_MIDDLE_C +
				(pm->midi_octave * 12);
			if (0 == velocity)
				velocity = 1; /* force note on */
		} else { /* note off */
			status = 128 + pm->midi_channel; /* 1000nnnn */
			note = note - 0x94 + PCMIDI_MIDDLE_C +
				(pm->midi_octave*12);

			if (pm->midi_sustain_mode) {
				for (i = 0; i < PCMIDI_SUSTAINED_MAX; i++) {
					pms = &pm->sustained_notes[i];
					if (!pms->in_use) {
						pms->status = status;
						pms->note = note;
						pms->velocity = velocity;
						pms->in_use = 1;

						mod_timer(&pms->timer,
							jiffies +
					msecs_to_jiffies(pm->midi_sustain));
						return 1;
					}
				}
			}
		}
		pcmidi_send_note(pm, status, note, velocity);
	}

	return 1;
}

static int pcmidi_handle_report4(struct pcmidi_snd *pm, u8 *data)
{
	unsigned	key;
	u32		bit_mask;
	u32		bit_index;

	bit_mask = data[1];
	bit_mask = (bit_mask << 8) | data[2];
	bit_mask = (bit_mask << 8) | data[3];

	/* break keys */
	for (bit_index = 0; bit_index < 24; bit_index++) {
		if (!((0x01 << bit_index) & bit_mask)) {
			input_event(pm->input_ep82, EV_KEY,
				pm->last_key[bit_index], 0);
			pm->last_key[bit_index] = 0;
		}
	}

	/* make keys */
	for (bit_index = 0; bit_index < 24; bit_index++) {
		key = 0;
		switch ((0x01 << bit_index) & bit_mask) {
		case 0x000010: /* Fn lock*/
			pm->fn_state ^= 0x000010;
			if (pm->fn_state)
				pcmidi_submit_output_report(pm, 0xc5);
			else
				pcmidi_submit_output_report(pm, 0xc6);
			continue;
		case 0x020000: /* midi launcher..send a key (qwerty) or not? */
			pcmidi_submit_output_report(pm, 0xc1);
			pm->midi_mode ^= 0x01;

			dbg_hid("pcmidi mode: %d\n", pm->midi_mode);
			continue;
		case 0x100000: /* KEY_MESSENGER or octave up */
			dbg_hid("pcmidi mode: %d\n", pm->midi_mode);
			if (pm->midi_mode) {
				pm->midi_octave++;
				if (pm->midi_octave > 2)
					pm->midi_octave = 2;
				dbg_hid("pcmidi mode: %d octave: %d\n",
					pm->midi_mode, pm->midi_octave);
				continue;
			} else
				key = KEY_MESSENGER;
			break;
		case 0x400000:
			key = KEY_CALENDAR;
			break;
		case 0x080000:
			key = KEY_ADDRESSBOOK;
			break;
		case 0x040000:
			key = KEY_DOCUMENTS;
			break;
		case 0x800000:
			key = KEY_WORDPROCESSOR;
			break;
		case 0x200000:
			key = KEY_SPREADSHEET;
			break;
		case 0x010000:
			key = KEY_COFFEE;
			break;
		case 0x000100:
			key = KEY_HELP;
			break;
		case 0x000200:
			key = KEY_SEND;
			break;
		case 0x000400:
			key = KEY_REPLY;
			break;
		case 0x000800:
			key = KEY_FORWARDMAIL;
			break;
		case 0x001000:
			key = KEY_NEW;
			break;
		case 0x002000:
			key = KEY_OPEN;
			break;
		case 0x004000:
			key = KEY_CLOSE;
			break;
		case 0x008000:
			key = KEY_SAVE;
			break;
		case 0x000001:
			key = KEY_UNDO;
			break;
		case 0x000002:
			key = KEY_REDO;
			break;
		case 0x000004:
			key = KEY_SPELLCHECK;
			break;
		case 0x000008:
			key = KEY_PRINT;
			break;
		}
		if (key) {
			input_event(pm->input_ep82, EV_KEY, key, 1);
			pm->last_key[bit_index] = key;
		}
	}

	return 1;
}

static int pcmidi_handle_report(
	struct pcmidi_snd *pm, unsigned report_id, u8 *data, int size)
{
	int ret = 0;

	switch (report_id) {
	case 0x01: /* midi keys (qwerty)*/
		ret = pcmidi_handle_report1(pm, data);
		break;
	case 0x03: /* midi keyboard (musical)*/
		ret = pcmidi_handle_report3(pm, data, size);
		break;
	case 0x04: /* multimedia/midi keys (qwerty)*/
		ret = pcmidi_handle_report4(pm, data);
		break;
	}
	return ret;
}

static void pcmidi_setup_extra_keys(
	struct pcmidi_snd *pm, struct input_dev *input)
{
	/* reassigned functionality for N/A keys
		MY PICTURES =>	KEY_WORDPROCESSOR
		MY MUSIC=>	KEY_SPREADSHEET
	*/
	unsigned int keys[] = {
		KEY_FN,
		KEY_MESSENGER, KEY_CALENDAR,
		KEY_ADDRESSBOOK, KEY_DOCUMENTS,
		KEY_WORDPROCESSOR,
		KEY_SPREADSHEET,
		KEY_COFFEE,
		KEY_HELP, KEY_SEND,
		KEY_REPLY, KEY_FORWARDMAIL,
		KEY_NEW, KEY_OPEN,
		KEY_CLOSE, KEY_SAVE,
		KEY_UNDO, KEY_REDO,
		KEY_SPELLCHECK,	KEY_PRINT,
		0
	};

	unsigned int *pkeys = &keys[0];
	unsigned short i;

	if (pm->ifnum != 1)  /* only set up ONCE for interace 1 */
		return;

	pm->input_ep82 = input;

	for (i = 0; i < 24; i++)
		pm->last_key[i] = 0;

	while (*pkeys != 0) {
		set_bit(*pkeys, pm->input_ep82->keybit);
		++pkeys;
	}
}

static int pcmidi_set_operational(struct pcmidi_snd *pm)
{
	if (pm->ifnum != 1)
		return 0; /* only set up ONCE for interace 1 */

	pcmidi_get_output_report(pm);
	pcmidi_submit_output_report(pm, 0xc1);
	return 0;
}

static int pcmidi_snd_free(struct snd_device *dev)
{
	return 0;
}

static int pcmidi_in_open(struct snd_rawmidi_substream *substream)
{
	struct pcmidi_snd *pm = substream->rmidi->private_data;

	dbg_hid("pcmidi in open\n");
	pm->in_substream = substream;
	return 0;
}

static int pcmidi_in_close(struct snd_rawmidi_substream *substream)
{
	dbg_hid("pcmidi in close\n");
	return 0;
}

static void pcmidi_in_trigger(struct snd_rawmidi_substream *substream, int up)
{
	struct pcmidi_snd *pm = substream->rmidi->private_data;

	dbg_hid("pcmidi in trigger %d\n", up);

	pm->in_triggered = up;
}

static const struct snd_rawmidi_ops pcmidi_in_ops = {
	.open = pcmidi_in_open,
	.close = pcmidi_in_close,
	.trigger = pcmidi_in_trigger
};

static int pcmidi_snd_initialise(struct pcmidi_snd *pm)
{
	static int dev;
	struct snd_card *card;
	struct snd_rawmidi *rwmidi;
	int err;

	static struct snd_device_ops ops = {
		.dev_free = pcmidi_snd_free,
	};

	if (pm->ifnum != 1)
		return 0; /* only set up midi device ONCE for interace 1 */

	if (dev >= SNDRV_CARDS)
		return -ENODEV;

	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	/* Setup sound card */

	err = snd_card_new(&pm->pk->hdev->dev, index[dev], id[dev],
			   THIS_MODULE, 0, &card);
	if (err < 0) {
		pk_error("failed to create pc-midi sound card\n");
		err = -ENOMEM;
		goto fail;
	}
	pm->card = card;

	/* Setup sound device */
	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, pm, &ops);
	if (err < 0) {
		pk_error("failed to create pc-midi sound device: error %d\n",
			err);
		goto fail;
	}

	strncpy(card->driver, shortname, sizeof(card->driver));
	strncpy(card->shortname, shortname, sizeof(card->shortname));
	strncpy(card->longname, longname, sizeof(card->longname));

	/* Set up rawmidi */
	err = snd_rawmidi_new(card, card->shortname, 0,
			      0, 1, &rwmidi);
	if (err < 0) {
		pk_error("failed to create pc-midi rawmidi device: error %d\n",
			err);
		goto fail;
	}
	pm->rwmidi = rwmidi;
	strncpy(rwmidi->name, card->shortname, sizeof(rwmidi->name));
	rwmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT;
	rwmidi->private_data = pm;

	snd_rawmidi_set_ops(rwmidi, SNDRV_RAWMIDI_STREAM_INPUT,
		&pcmidi_in_ops);

	/* create sysfs variables */
	err = device_create_file(&pm->pk->hdev->dev,
				 sysfs_device_attr_channel);
	if (err < 0) {
		pk_error("failed to create sysfs attribute channel: error %d\n",
			err);
		goto fail;
	}

	err = device_create_file(&pm->pk->hdev->dev,
				sysfs_device_attr_sustain);
	if (err < 0) {
		pk_error("failed to create sysfs attribute sustain: error %d\n",
			err);
		goto fail_attr_sustain;
	}

	err = device_create_file(&pm->pk->hdev->dev,
			 sysfs_device_attr_octave);
	if (err < 0) {
		pk_error("failed to create sysfs attribute octave: error %d\n",
			err);
		goto fail_attr_octave;
	}

	spin_lock_init(&pm->rawmidi_in_lock);

	init_sustain_timers(pm);
	pcmidi_set_operational(pm);

	/* register it */
	err = snd_card_register(card);
	if (err < 0) {
		pk_error("failed to register pc-midi sound card: error %d\n",
			 err);
		goto fail_register;
	}

	dbg_hid("pcmidi_snd_initialise finished ok\n");
	return 0;

fail_register:
	stop_sustain_timers(pm);
	device_remove_file(&pm->pk->hdev->dev, sysfs_device_attr_octave);
fail_attr_octave:
	device_remove_file(&pm->pk->hdev->dev, sysfs_device_attr_sustain);
fail_attr_sustain:
	device_remove_file(&pm->pk->hdev->dev, sysfs_device_attr_channel);
fail:
	if (pm->card) {
		snd_card_free(pm->card);
		pm->card = NULL;
	}
	return err;
}

static int pcmidi_snd_terminate(struct pcmidi_snd *pm)
{
	if (pm->card) {
		stop_sustain_timers(pm);

		device_remove_file(&pm->pk->hdev->dev,
			sysfs_device_attr_channel);
		device_remove_file(&pm->pk->hdev->dev,
			sysfs_device_attr_sustain);
		device_remove_file(&pm->pk->hdev->dev,
			sysfs_device_attr_octave);

		snd_card_disconnect(pm->card);
		snd_card_free_when_closed(pm->card);
	}

	return 0;
}

/*
 * PC-MIDI report descriptor for report id is wrong.
 */
static __u8 *pk_report_fixup(struct hid_device *hdev, __u8 *rdesc,
		unsigned int *rsize)
{
	if (*rsize == 178 &&
	      rdesc[111] == 0x06 && rdesc[112] == 0x00 &&
	      rdesc[113] == 0xff) {
		hid_info(hdev,
			 "fixing up pc-midi keyboard report descriptor\n");

		rdesc[144] = 0x18; /* report 4: was 0x10 report count */
	}
	return rdesc;
}

static int pk_input_mapping(struct hid_device *hdev, struct hid_input *hi,
		struct hid_field *field, struct hid_usage *usage,
		unsigned long **bit, int *max)
{
	struct pk_device *pk = hid_get_drvdata(hdev);
	struct pcmidi_snd *pm;

	pm = pk->pm;

	if (HID_UP_MSVENDOR == (usage->hid & HID_USAGE_PAGE) &&
		1 == pm->ifnum) {
		pcmidi_setup_extra_keys(pm, hi->input);
		return 0;
	}

	return 0;
}


static int pk_raw_event(struct hid_device *hdev, struct hid_report *report,
	u8 *data, int size)
{
	struct pk_device *pk = hid_get_drvdata(hdev);
	int ret = 0;

	if (1 == pk->pm->ifnum) {
		if (report->id == data[0])
			switch (report->id) {
			case 0x01: /* midi keys (qwerty)*/
			case 0x03: /* midi keyboard (musical)*/
			case 0x04: /* extra/midi keys (qwerty)*/
				ret = pcmidi_handle_report(pk->pm,
						report->id, data, size);
				break;
			}
	}

	return ret;
}

static int pk_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
	int ret;
	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
	unsigned short ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
	unsigned long quirks = id->driver_data;
	struct pk_device *pk;
	struct pcmidi_snd *pm = NULL;

	pk = kzalloc(sizeof(*pk), GFP_KERNEL);
	if (pk == NULL) {
		hid_err(hdev, "can't alloc descriptor\n");
		return -ENOMEM;
	}

	pk->hdev = hdev;

	pm = kzalloc(sizeof(*pm), GFP_KERNEL);
	if (pm == NULL) {
		hid_err(hdev, "can't alloc descriptor\n");
		ret = -ENOMEM;
		goto err_free_pk;
	}

	pm->pk = pk;
	pk->pm = pm;
	pm->ifnum = ifnum;

	hid_set_drvdata(hdev, pk);

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

	if (quirks & PK_QUIRK_NOGET) { /* hid_parse cleared all the quirks */
		hdev->quirks |= HID_QUIRK_NOGET;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		goto err_free;
	}

	ret = pcmidi_snd_initialise(pm);
	if (ret < 0)
		goto err_stop;

	return 0;
err_stop:
	hid_hw_stop(hdev);
err_free:
	kfree(pm);
err_free_pk:
	kfree(pk);

	return ret;
}

static void pk_remove(struct hid_device *hdev)
{
	struct pk_device *pk = hid_get_drvdata(hdev);
	struct pcmidi_snd *pm;

	pm = pk->pm;
	if (pm) {
		pcmidi_snd_terminate(pm);
		kfree(pm);
	}

	hid_hw_stop(hdev);

	kfree(pk);
}

static const struct hid_device_id pk_devices[] = {
	{HID_USB_DEVICE(USB_VENDOR_ID_CREATIVELABS,
		USB_DEVICE_ID_PRODIKEYS_PCMIDI),
	    .driver_data = PK_QUIRK_NOGET},
	{ }
};
MODULE_DEVICE_TABLE(hid, pk_devices);

static struct hid_driver pk_driver = {
	.name = "prodikeys",
	.id_table = pk_devices,
	.report_fixup = pk_report_fixup,
	.input_mapping = pk_input_mapping,
	.raw_event = pk_raw_event,
	.probe = pk_probe,
	.remove = pk_remove,
};
module_hid_driver(pk_driver);

MODULE_LICENSE("GPL");