hid-prodikeys.c 20.6 KB
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
/*
 *  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.
 *
 */

/*
 * 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.
 */

#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 = container_of(dev, struct 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 = container_of(dev, struct 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 = container_of(dev, struct 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 = container_of(dev, struct 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 = container_of(dev, struct 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 = container_of(dev, struct 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(unsigned long data)
{
	struct pcmidi_sustain *pms = (struct pcmidi_sustain *)data;

	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;
		setup_timer(&pms->timer, pcmidi_sustained_note_release,
			(unsigned long)pms);
	}
}

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++) {
		key = pm->last_key[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 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_create(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);

	snd_card_set_dev(card, &pm->pk->hdev->dev);

	/* 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");