summaryrefslogtreecommitdiffstats
path: root/sound/drivers/portman2x4.c
blob: 2f4514ed47c5ef69eee470c948f31bc16c5abd27 (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
850
851
852
853
854
855
856
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Driver for Midiman Portman2x4 parallel port midi interface
 *
 *   Copyright (c) by Levent Guendogdu <levon@feature-it.com>
 *
 * ChangeLog
 * Jan 24 2007 Matthias Koenig <mkoenig@suse.de>
 *      - cleanup and rewrite
 * Sep 30 2004 Tobias Gehrig <tobias@gehrig.tk>
 *      - source code cleanup
 * Sep 03 2004 Tobias Gehrig <tobias@gehrig.tk>
 *      - fixed compilation problem with alsa 1.0.6a (removed MODULE_CLASSES,
 *        MODULE_PARM_SYNTAX and changed MODULE_DEVICES to
 *        MODULE_SUPPORTED_DEVICE)
 * Mar 24 2004 Tobias Gehrig <tobias@gehrig.tk>
 *      - added 2.6 kernel support
 * Mar 18 2004 Tobias Gehrig <tobias@gehrig.tk>
 *      - added parport_unregister_driver to the startup routine if the driver fails to detect a portman
 *      - added support for all 4 output ports in portman_putmidi
 * Mar 17 2004 Tobias Gehrig <tobias@gehrig.tk>
 *      - added checks for opened input device in interrupt handler
 * Feb 20 2004 Tobias Gehrig <tobias@gehrig.tk>
 *      - ported from alsa 0.5 to 1.0
 */

#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/parport.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include <sound/control.h>

#define CARD_NAME "Portman 2x4"
#define DRIVER_NAME "portman"
#define PLATFORM_DRIVER "snd_portman2x4"

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;

static struct platform_device *platform_devices[SNDRV_CARDS]; 
static int device_count;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");

MODULE_AUTHOR("Levent Guendogdu, Tobias Gehrig, Matthias Koenig");
MODULE_DESCRIPTION("Midiman Portman2x4");
MODULE_LICENSE("GPL");

/*********************************************************************
 * Chip specific
 *********************************************************************/
#define PORTMAN_NUM_INPUT_PORTS 2
#define PORTMAN_NUM_OUTPUT_PORTS 4

struct portman {
	spinlock_t reg_lock;
	struct snd_card *card;
	struct snd_rawmidi *rmidi;
	struct pardevice *pardev;
	int open_count;
	int mode[PORTMAN_NUM_INPUT_PORTS];
	struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS];
};

static int portman_free(struct portman *pm)
{
	kfree(pm);
	return 0;
}

static int portman_create(struct snd_card *card,
			  struct pardevice *pardev,
			  struct portman **rchip)
{
	struct portman *pm;

	*rchip = NULL;

	pm = kzalloc(sizeof(struct portman), GFP_KERNEL);
	if (pm == NULL) 
		return -ENOMEM;

	/* Init chip specific data */
	spin_lock_init(&pm->reg_lock);
	pm->card = card;
	pm->pardev = pardev;

	*rchip = pm;

	return 0;
}

/*********************************************************************
 * HW related constants
 *********************************************************************/

/* Standard PC parallel port status register equates. */
#define	PP_STAT_BSY   	0x80	/* Busy status.  Inverted. */
#define	PP_STAT_ACK   	0x40	/* Acknowledge.  Non-Inverted. */
#define	PP_STAT_POUT  	0x20	/* Paper Out.    Non-Inverted. */
#define	PP_STAT_SEL   	0x10	/* Select.       Non-Inverted. */
#define	PP_STAT_ERR   	0x08	/* Error.        Non-Inverted. */

/* Standard PC parallel port command register equates. */
#define	PP_CMD_IEN  	0x10	/* IRQ Enable.   Non-Inverted. */
#define	PP_CMD_SELI 	0x08	/* Select Input. Inverted. */
#define	PP_CMD_INIT 	0x04	/* Init Printer. Non-Inverted. */
#define	PP_CMD_FEED 	0x02	/* Auto Feed.    Inverted. */
#define	PP_CMD_STB      0x01	/* Strobe.       Inverted. */

/* Parallel Port Command Register as implemented by PCP2x4. */
#define	INT_EN	 	PP_CMD_IEN	/* Interrupt enable. */
#define	STROBE	        PP_CMD_STB	/* Command strobe. */

/* The parallel port command register field (b1..b3) selects the 
 * various "registers" within the PC/P 2x4.  These are the internal
 * address of these "registers" that must be written to the parallel
 * port command register.
 */
#define	RXDATA0		(0 << 1)	/* PCP RxData channel 0. */
#define	RXDATA1		(1 << 1)	/* PCP RxData channel 1. */
#define	GEN_CTL		(2 << 1)	/* PCP General Control Register. */
#define	SYNC_CTL 	(3 << 1)	/* PCP Sync Control Register. */
#define	TXDATA0		(4 << 1)	/* PCP TxData channel 0. */
#define	TXDATA1		(5 << 1)	/* PCP TxData channel 1. */
#define	TXDATA2		(6 << 1)	/* PCP TxData channel 2. */
#define	TXDATA3		(7 << 1)	/* PCP TxData channel 3. */

/* Parallel Port Status Register as implemented by PCP2x4. */
#define	ESTB		PP_STAT_POUT	/* Echoed strobe. */
#define	INT_REQ         PP_STAT_ACK	/* Input data int request. */
#define	BUSY            PP_STAT_ERR	/* Interface Busy. */

/* Parallel Port Status Register BUSY and SELECT lines are multiplexed
 * between several functions.  Depending on which 2x4 "register" is
 * currently selected (b1..b3), the BUSY and SELECT lines are
 * assigned as follows:
 *
 *   SELECT LINE:                                                    A3 A2 A1
 *                                                                   --------
 */
#define	RXAVAIL		PP_STAT_SEL	/* Rx Available, channel 0.   0 0 0 */
//  RXAVAIL1    PP_STAT_SEL             /* Rx Available, channel 1.   0 0 1 */
#define	SYNC_STAT	PP_STAT_SEL	/* Reserved - Sync Status.    0 1 0 */
//                                      /* Reserved.                  0 1 1 */
#define	TXEMPTY		PP_STAT_SEL	/* Tx Empty, channel 0.       1 0 0 */
//      TXEMPTY1        PP_STAT_SEL     /* Tx Empty, channel 1.       1 0 1 */
//  TXEMPTY2    PP_STAT_SEL             /* Tx Empty, channel 2.       1 1 0 */
//  TXEMPTY3    PP_STAT_SEL             /* Tx Empty, channel 3.       1 1 1 */

/*   BUSY LINE:                                                      A3 A2 A1
 *                                                                   --------
 */
#define	RXDATA		PP_STAT_BSY	/* Rx Input Data, channel 0.  0 0 0 */
//      RXDATA1         PP_STAT_BSY     /* Rx Input Data, channel 1.  0 0 1 */
#define	SYNC_DATA       PP_STAT_BSY	/* Reserved - Sync Data.      0 1 0 */
					/* Reserved.                  0 1 1 */
#define	DATA_ECHO       PP_STAT_BSY	/* Parallel Port Data Echo.   1 0 0 */
#define	A0_ECHO         PP_STAT_BSY	/* Address 0 Echo.            1 0 1 */
#define	A1_ECHO         PP_STAT_BSY	/* Address 1 Echo.            1 1 0 */
#define	A2_ECHO         PP_STAT_BSY	/* Address 2 Echo.            1 1 1 */

#define PORTMAN2X4_MODE_INPUT_TRIGGERED	 0x01

/*********************************************************************
 * Hardware specific functions
 *********************************************************************/
static inline void portman_write_command(struct portman *pm, u8 value)
{
	parport_write_control(pm->pardev->port, value);
}

static inline u8 portman_read_command(struct portman *pm)
{
	return parport_read_control(pm->pardev->port);
}

static inline u8 portman_read_status(struct portman *pm)
{
	return parport_read_status(pm->pardev->port);
}

static inline u8 portman_read_data(struct portman *pm)
{
	return parport_read_data(pm->pardev->port);
}

static inline void portman_write_data(struct portman *pm, u8 value)
{
	parport_write_data(pm->pardev->port, value);
}

static void portman_write_midi(struct portman *pm, 
			       int port, u8 mididata)
{
	int command = ((port + 4) << 1);

	/* Get entering data byte and port number in BL and BH respectively.
	 * Set up Tx Channel address field for use with PP Cmd Register.
	 * Store address field in BH register.
	 * Inputs:      AH = Output port number (0..3).
	 *              AL = Data byte.
	 *    command = TXDATA0 | INT_EN;
	 * Align port num with address field (b1...b3),
	 * set address for TXDatax, Strobe=0
	 */
	command |= INT_EN;

	/* Disable interrupts so that the process is not interrupted, then 
	 * write the address associated with the current Tx channel to the 
	 * PP Command Reg.  Do not set the Strobe signal yet.
	 */

	do {
		portman_write_command(pm, command);

		/* While the address lines settle, write parallel output data to 
		 * PP Data Reg.  This has no effect until Strobe signal is asserted.
		 */

		portman_write_data(pm, mididata);
		
		/* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
		 * Status Register), then go write data.  Else go back and wait.
		 */
	} while ((portman_read_status(pm) & TXEMPTY) != TXEMPTY);

	/* TxEmpty is set.  Maintain PC/P destination address and assert
	 * Strobe through the PP Command Reg.  This will Strobe data into
	 * the PC/P transmitter and set the PC/P BUSY signal.
	 */

	portman_write_command(pm, command | STROBE);

	/* Wait for strobe line to settle and echo back through hardware.
	 * Once it has echoed back, assume that the address and data lines
	 * have settled!
	 */

	while ((portman_read_status(pm) & ESTB) == 0)
		cpu_relax();

	/* Release strobe and immediately re-allow interrupts. */
	portman_write_command(pm, command);

	while ((portman_read_status(pm) & ESTB) == ESTB)
		cpu_relax();

	/* PC/P BUSY is now set.  We must wait until BUSY resets itself.
	 * We'll reenable ints while we're waiting.
	 */

	while ((portman_read_status(pm) & BUSY) == BUSY)
		cpu_relax();

	/* Data sent. */
}


/*
 *  Read MIDI byte from port
 *  Attempt to read input byte from specified hardware input port (0..).
 *  Return -1 if no data
 */
static int portman_read_midi(struct portman *pm, int port)
{
	unsigned char midi_data = 0;
	unsigned char cmdout;	/* Saved address+IE bit. */

	/* Make sure clocking edge is down before starting... */
	portman_write_data(pm, 0);	/* Make sure edge is down. */

	/* Set destination address to PCP. */
	cmdout = (port << 1) | INT_EN;	/* Address + IE + No Strobe. */
	portman_write_command(pm, cmdout);

	while ((portman_read_status(pm) & ESTB) == ESTB)
		cpu_relax();	/* Wait for strobe echo. */

	/* After the address lines settle, check multiplexed RxAvail signal.
	 * If data is available, read it.
	 */
	if ((portman_read_status(pm) & RXAVAIL) == 0)
		return -1;	/* No data. */

	/* Set the Strobe signal to enable the Rx clocking circuitry. */
	portman_write_command(pm, cmdout | STROBE);	/* Write address+IE+Strobe. */

	while ((portman_read_status(pm) & ESTB) == 0)
		cpu_relax(); /* Wait for strobe echo. */

	/* The first data bit (msb) is already sitting on the input line. */
	midi_data = (portman_read_status(pm) & 128);
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 6. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 1) & 64;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 5. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 2) & 32;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 4. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 3) & 16;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 3. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 4) & 8;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 2. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 5) & 4;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 1. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 6) & 2;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */

	/* Data bit 0. */
	portman_write_data(pm, 0);	/* Cause falling edge while data settles. */
	midi_data |= (portman_read_status(pm) >> 7) & 1;
	portman_write_data(pm, 1);	/* Cause rising edge, which shifts data. */
	portman_write_data(pm, 0);	/* Return data clock low. */


	/* De-assert Strobe and return data. */
	portman_write_command(pm, cmdout);	/* Output saved address+IE. */

	/* Wait for strobe echo. */
	while ((portman_read_status(pm) & ESTB) == ESTB)
		cpu_relax();

	return (midi_data & 255);	/* Shift back and return value. */
}

/*
 *  Checks if any input data on the given channel is available
 *  Checks RxAvail 
 */
static int portman_data_avail(struct portman *pm, int channel)
{
	int command = INT_EN;
	switch (channel) {
	case 0:
		command |= RXDATA0;
		break;
	case 1:
		command |= RXDATA1;
		break;
	}
	/* Write hardware (assumme STROBE=0) */
	portman_write_command(pm, command);
	/* Check multiplexed RxAvail signal */
	if ((portman_read_status(pm) & RXAVAIL) == RXAVAIL)
		return 1;	/* Data available */

	/* No Data available */
	return 0;
}


/*
 *  Flushes any input
 */
static void portman_flush_input(struct portman *pm, unsigned char port)
{
	/* Local variable for counting things */
	unsigned int i = 0;
	unsigned char command = 0;

	switch (port) {
	case 0:
		command = RXDATA0;
		break;
	case 1:
		command = RXDATA1;
		break;
	default:
		snd_printk(KERN_WARNING
			   "portman_flush_input() Won't flush port %i\n",
			   port);
		return;
	}

	/* Set address for specified channel in port and allow to settle. */
	portman_write_command(pm, command);

	/* Assert the Strobe and wait for echo back. */
	portman_write_command(pm, command | STROBE);

	/* Wait for ESTB */
	while ((portman_read_status(pm) & ESTB) == 0)
		cpu_relax();

	/* Output clock cycles to the Rx circuitry. */
	portman_write_data(pm, 0);

	/* Flush 250 bits... */
	for (i = 0; i < 250; i++) {
		portman_write_data(pm, 1);
		portman_write_data(pm, 0);
	}

	/* Deassert the Strobe signal of the port and wait for it to settle. */
	portman_write_command(pm, command | INT_EN);

	/* Wait for settling */
	while ((portman_read_status(pm) & ESTB) == ESTB)
		cpu_relax();
}

static int portman_probe(struct parport *p)
{
	/* Initialize the parallel port data register.  Will set Rx clocks
	 * low in case we happen to be addressing the Rx ports at this time.
	 */
	/* 1 */
	parport_write_data(p, 0);

	/* Initialize the parallel port command register, thus initializing
	 * hardware handshake lines to midi box:
	 *
	 *                                  Strobe = 0
	 *                                  Interrupt Enable = 0            
	 */
	/* 2 */
	parport_write_control(p, 0);

	/* Check if Portman PC/P 2x4 is out there. */
	/* 3 */
	parport_write_control(p, RXDATA0);	/* Write Strobe=0 to command reg. */

	/* Check for ESTB to be clear */
	/* 4 */
	if ((parport_read_status(p) & ESTB) == ESTB)
		return 1;	/* CODE 1 - Strobe Failure. */

	/* Set for RXDATA0 where no damage will be done. */
	/* 5 */
	parport_write_control(p, RXDATA0 | STROBE);	/* Write Strobe=1 to command reg. */

	/* 6 */
	if ((parport_read_status(p) & ESTB) != ESTB)
		return 1;	/* CODE 1 - Strobe Failure. */

	/* 7 */
	parport_write_control(p, 0);	/* Reset Strobe=0. */

	/* Check if Tx circuitry is functioning properly.  If initialized 
	 * unit TxEmpty is false, send out char and see if it goes true.
	 */
	/* 8 */
	parport_write_control(p, TXDATA0);	/* Tx channel 0, strobe off. */

	/* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
	 * Status Register), then go write data.  Else go back and wait.
	 */
	/* 9 */
	if ((parport_read_status(p) & TXEMPTY) == 0)
		return 2;

	/* Return OK status. */
	return 0;
}

static int portman_device_init(struct portman *pm)
{
	portman_flush_input(pm, 0);
	portman_flush_input(pm, 1);

	return 0;
}

/*********************************************************************
 * Rawmidi
 *********************************************************************/
static int snd_portman_midi_open(struct snd_rawmidi_substream *substream)
{
	return 0;
}

static int snd_portman_midi_close(struct snd_rawmidi_substream *substream)
{
	return 0;
}

static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream,
					   int up)
{
	struct portman *pm = substream->rmidi->private_data;
	unsigned long flags;

	spin_lock_irqsave(&pm->reg_lock, flags);
	if (up)
		pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED;
	else
		pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED;
	spin_unlock_irqrestore(&pm->reg_lock, flags);
}

static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream,
					    int up)
{
	struct portman *pm = substream->rmidi->private_data;
	unsigned long flags;
	unsigned char byte;

	spin_lock_irqsave(&pm->reg_lock, flags);
	if (up) {
		while ((snd_rawmidi_transmit(substream, &byte, 1) == 1))
			portman_write_midi(pm, substream->number, byte);
	}
	spin_unlock_irqrestore(&pm->reg_lock, flags);
}

static const struct snd_rawmidi_ops snd_portman_midi_output = {
	.open =		snd_portman_midi_open,
	.close =	snd_portman_midi_close,
	.trigger =	snd_portman_midi_output_trigger,
};

static const struct snd_rawmidi_ops snd_portman_midi_input = {
	.open =		snd_portman_midi_open,
	.close =	snd_portman_midi_close,
	.trigger =	snd_portman_midi_input_trigger,
};

/* Create and initialize the rawmidi component */
static int snd_portman_rawmidi_create(struct snd_card *card)
{
	struct portman *pm = card->private_data;
	struct snd_rawmidi *rmidi;
	struct snd_rawmidi_substream *substream;
	int err;
	
	err = snd_rawmidi_new(card, CARD_NAME, 0, 
			      PORTMAN_NUM_OUTPUT_PORTS, 
			      PORTMAN_NUM_INPUT_PORTS, 
			      &rmidi);
	if (err < 0) 
		return err;

	rmidi->private_data = pm;
	strcpy(rmidi->name, CARD_NAME);
	rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
		            SNDRV_RAWMIDI_INFO_INPUT |
                            SNDRV_RAWMIDI_INFO_DUPLEX;

	pm->rmidi = rmidi;

	/* register rawmidi ops */
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 
			    &snd_portman_midi_output);
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 
			    &snd_portman_midi_input);

	/* name substreams */
	/* output */
	list_for_each_entry(substream,
			    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
			    list) {
		sprintf(substream->name,
			"Portman2x4 %d", substream->number+1);
	}
	/* input */
	list_for_each_entry(substream,
			    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
			    list) {
		pm->midi_input[substream->number] = substream;
		sprintf(substream->name,
			"Portman2x4 %d", substream->number+1);
	}

	return err;
}

/*********************************************************************
 * parport stuff
 *********************************************************************/
static void snd_portman_interrupt(void *userdata)
{
	unsigned char midivalue = 0;
	struct portman *pm = ((struct snd_card*)userdata)->private_data;

	spin_lock(&pm->reg_lock);

	/* While any input data is waiting */
	while ((portman_read_status(pm) & INT_REQ) == INT_REQ) {
		/* If data available on channel 0, 
		   read it and stuff it into the queue. */
		if (portman_data_avail(pm, 0)) {
			/* Read Midi */
			midivalue = portman_read_midi(pm, 0);
			/* put midi into queue... */
			if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
				snd_rawmidi_receive(pm->midi_input[0],
						    &midivalue, 1);

		}
		/* If data available on channel 1, 
		   read it and stuff it into the queue. */
		if (portman_data_avail(pm, 1)) {
			/* Read Midi */
			midivalue = portman_read_midi(pm, 1);
			/* put midi into queue... */
			if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
				snd_rawmidi_receive(pm->midi_input[1],
						    &midivalue, 1);
		}

	}

	spin_unlock(&pm->reg_lock);
}

static void snd_portman_attach(struct parport *p)
{
	struct platform_device *device;

	device = platform_device_alloc(PLATFORM_DRIVER, device_count);
	if (!device)
		return;

	/* Temporary assignment to forward the parport */
	platform_set_drvdata(device, p);

	if (platform_device_add(device) < 0) {
		platform_device_put(device);
		return;
	}

	/* Since we dont get the return value of probe
	 * We need to check if device probing succeeded or not */
	if (!platform_get_drvdata(device)) {
		platform_device_unregister(device);
		return;
	}

	/* register device in global table */
	platform_devices[device_count] = device;
	device_count++;
}

static void snd_portman_detach(struct parport *p)
{
	/* nothing to do here */
}

static int snd_portman_dev_probe(struct pardevice *pardev)
{
	if (strcmp(pardev->name, DRIVER_NAME))
		return -ENODEV;

	return 0;
}

static struct parport_driver portman_parport_driver = {
	.name		= "portman2x4",
	.probe		= snd_portman_dev_probe,
	.match_port	= snd_portman_attach,
	.detach		= snd_portman_detach,
	.devmodel	= true,
};

/*********************************************************************
 * platform stuff
 *********************************************************************/
static void snd_portman_card_private_free(struct snd_card *card)
{
	struct portman *pm = card->private_data;
	struct pardevice *pardev = pm->pardev;

	if (pardev) {
		parport_release(pardev);
		parport_unregister_device(pardev);
	}

	portman_free(pm);
}

static int snd_portman_probe(struct platform_device *pdev)
{
	struct pardevice *pardev;
	struct parport *p;
	int dev = pdev->id;
	struct snd_card *card = NULL;
	struct portman *pm = NULL;
	int err;
	struct pardev_cb portman_cb = {
		.preempt = NULL,
		.wakeup = NULL,
		.irq_func = snd_portman_interrupt,	/* ISR */
		.flags = PARPORT_DEV_EXCL,		/* flags */
	};

	p = platform_get_drvdata(pdev);
	platform_set_drvdata(pdev, NULL);

	if (dev >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[dev]) 
		return -ENOENT;

	err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
			   0, &card);
	if (err < 0) {
		snd_printd("Cannot create card\n");
		return err;
	}
	strcpy(card->driver, DRIVER_NAME);
	strcpy(card->shortname, CARD_NAME);
	sprintf(card->longname,  "%s at 0x%lx, irq %i", 
		card->shortname, p->base, p->irq);

	portman_cb.private = card;			   /* private */
	pardev = parport_register_dev_model(p,		   /* port */
					    DRIVER_NAME,   /* name */
					    &portman_cb,   /* callbacks */
					    pdev->id);	   /* device number */
	if (pardev == NULL) {
		snd_printd("Cannot register pardevice\n");
		err = -EIO;
		goto __err;
	}

	/* claim parport */
	if (parport_claim(pardev)) {
		snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
		err = -EIO;
		goto free_pardev;
	}

	if ((err = portman_create(card, pardev, &pm)) < 0) {
		snd_printd("Cannot create main component\n");
		goto release_pardev;
	}
	card->private_data = pm;
	card->private_free = snd_portman_card_private_free;

	err = portman_probe(p);
	if (err) {
		err = -EIO;
		goto __err;
	}
	
	if ((err = snd_portman_rawmidi_create(card)) < 0) {
		snd_printd("Creating Rawmidi component failed\n");
		goto __err;
	}

	/* init device */
	if ((err = portman_device_init(pm)) < 0)
		goto __err;

	platform_set_drvdata(pdev, card);

	/* At this point card will be usable */
	if ((err = snd_card_register(card)) < 0) {
		snd_printd("Cannot register card\n");
		goto __err;
	}

	snd_printk(KERN_INFO "Portman 2x4 on 0x%lx\n", p->base);
	return 0;

release_pardev:
	parport_release(pardev);
free_pardev:
	parport_unregister_device(pardev);
__err:
	snd_card_free(card);
	return err;
}

static int snd_portman_remove(struct platform_device *pdev)
{
	struct snd_card *card = platform_get_drvdata(pdev);

	if (card)
		snd_card_free(card);

	return 0;
}


static struct platform_driver snd_portman_driver = {
	.probe  = snd_portman_probe,
	.remove = snd_portman_remove,
	.driver = {
		.name = PLATFORM_DRIVER,
	}
};

/*********************************************************************
 * module init stuff
 *********************************************************************/
static void snd_portman_unregister_all(void)
{
	int i;

	for (i = 0; i < SNDRV_CARDS; ++i) {
		if (platform_devices[i]) {
			platform_device_unregister(platform_devices[i]);
			platform_devices[i] = NULL;
		}
	}		
	platform_driver_unregister(&snd_portman_driver);
	parport_unregister_driver(&portman_parport_driver);
}

static int __init snd_portman_module_init(void)
{
	int err;

	if ((err = platform_driver_register(&snd_portman_driver)) < 0)
		return err;

	if (parport_register_driver(&portman_parport_driver) != 0) {
		platform_driver_unregister(&snd_portman_driver);
		return -EIO;
	}

	if (device_count == 0) {
		snd_portman_unregister_all();
		return -ENODEV;
	}

	return 0;
}

static void __exit snd_portman_module_exit(void)
{
	snd_portman_unregister_all();
}

module_init(snd_portman_module_init);
module_exit(snd_portman_module_exit);