aboutsummaryrefslogtreecommitdiff
path: root/drivers/isdn/hisax/st5481_d.c
blob: 071b1d31999f75c27c03740861c7cb0ea008cf14 (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
/*
 * Driver for ST5481 USB ISDN modem
 *
 * Author       Frode Isaksen
 * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
 *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/init.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include "st5481.h"

static void ph_connect(struct st5481_adapter *adapter);
static void ph_disconnect(struct st5481_adapter *adapter);

static struct Fsm l1fsm;

static char *strL1State[] =
{
	"ST_L1_F3",
	"ST_L1_F4",
	"ST_L1_F6",
	"ST_L1_F7",
	"ST_L1_F8",
};

static char *strL1Event[] =
{
	"EV_IND_DP",  
	"EV_IND_1",   
	"EV_IND_2",   
	"EV_IND_3",   
	"EV_IND_RSY", 
	"EV_IND_5",   
	"EV_IND_6",   
	"EV_IND_7",   
	"EV_IND_AP",  
	"EV_IND_9",   
	"EV_IND_10",  
	"EV_IND_11",  
	"EV_IND_AI8",
	"EV_IND_AI10",
	"EV_IND_AIL",
	"EV_IND_DI",  
	"EV_PH_ACTIVATE_REQ",
	"EV_PH_DEACTIVATE_REQ",
	"EV_TIMER3",
};

static inline void D_L1L2(struct st5481_adapter *adapter, int pr, void *arg)
{
	struct hisax_if *ifc = (struct hisax_if *) &adapter->hisax_d_if;

	ifc->l1l2(ifc, pr, arg);
}

static void
l1_go_f3(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	if (fi->state == ST_L1_F7)
		ph_disconnect(adapter);
	
	FsmChangeState(fi, ST_L1_F3);
	D_L1L2(adapter, PH_DEACTIVATE | INDICATION, NULL);
}

static void
l1_go_f6(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	if (fi->state == ST_L1_F7)
		ph_disconnect(adapter);

	FsmChangeState(fi, ST_L1_F6);
}

static void
l1_go_f7(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	FsmDelTimer(&adapter->timer, 0);
	ph_connect(adapter);
	FsmChangeState(fi, ST_L1_F7);
	D_L1L2(adapter, PH_ACTIVATE | INDICATION, NULL);
}

static void
l1_go_f8(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	if (fi->state == ST_L1_F7)
		ph_disconnect(adapter);

	FsmChangeState(fi, ST_L1_F8);
}

static void
l1_timer3(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	st5481_ph_command(adapter, ST5481_CMD_DR);
	FsmChangeState(fi, ST_L1_F3);
	D_L1L2(adapter, PH_DEACTIVATE | INDICATION, NULL);
}

static void
l1_ignore(struct FsmInst *fi, int event, void *arg)
{
}

static void
l1_activate(struct FsmInst *fi, int event, void *arg)
{
	struct st5481_adapter *adapter = fi->userdata;

	st5481_ph_command(adapter, ST5481_CMD_DR);
	st5481_ph_command(adapter, ST5481_CMD_PUP);
	FsmRestartTimer(&adapter->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
	st5481_ph_command(adapter, ST5481_CMD_AR8);
	FsmChangeState(fi, ST_L1_F4);
}

static struct FsmNode L1FnList[] __initdata =
{
	{ST_L1_F3, EV_IND_DP,            l1_ignore},
	{ST_L1_F3, EV_IND_AP,            l1_go_f6},
	{ST_L1_F3, EV_IND_AI8,           l1_go_f7},
	{ST_L1_F3, EV_IND_AI10,          l1_go_f7},
	{ST_L1_F3, EV_PH_ACTIVATE_REQ,   l1_activate},

	{ST_L1_F4, EV_TIMER3,            l1_timer3},
	{ST_L1_F4, EV_IND_DP,            l1_go_f3},
	{ST_L1_F4, EV_IND_AP,            l1_go_f6},
	{ST_L1_F4, EV_IND_AI8,           l1_go_f7},
	{ST_L1_F4, EV_IND_AI10,          l1_go_f7},

	{ST_L1_F6, EV_TIMER3,            l1_timer3},
	{ST_L1_F6, EV_IND_DP,            l1_go_f3},
	{ST_L1_F6, EV_IND_AP,            l1_ignore},
	{ST_L1_F6, EV_IND_AI8,           l1_go_f7},
	{ST_L1_F6, EV_IND_AI10,          l1_go_f7},
	{ST_L1_F7, EV_IND_RSY,           l1_go_f8},

	{ST_L1_F7, EV_IND_DP,            l1_go_f3},
	{ST_L1_F7, EV_IND_AP,            l1_go_f6},
	{ST_L1_F7, EV_IND_AI8,           l1_ignore},
	{ST_L1_F7, EV_IND_AI10,          l1_ignore},
	{ST_L1_F7, EV_IND_RSY,           l1_go_f8},

	{ST_L1_F8, EV_TIMER3,            l1_timer3},
	{ST_L1_F8, EV_IND_DP,            l1_go_f3},
	{ST_L1_F8, EV_IND_AP,            l1_go_f6},
	{ST_L1_F8, EV_IND_AI8,           l1_go_f8},
	{ST_L1_F8, EV_IND_AI10,          l1_go_f8},
	{ST_L1_F8, EV_IND_RSY,           l1_ignore},
};

static void l1m_debug(struct FsmInst *fi, char *fmt, ...)
{
	va_list args;
	char buf[256];
	
	va_start(args, fmt);
	vsprintf(buf, fmt, args);
	DBG(8, "%s", buf);
	va_end(args);
}

/* ======================================================================
 * D-Channel out
 */

/*
  D OUT state machine:
  ====================

  Transmit short frame (< 16 bytes of encoded data):

  L1 FRAME    D_OUT_STATE           USB                  D CHANNEL
  --------    -----------           ---                  ---------
 
              FIXME

 -> [xx..xx]  SHORT_INIT            -> [7Exx..xxC1C27EFF]
              SHORT_WAIT_DEN        <> OUT_D_COUNTER=16 
                                                 
              END_OF_SHORT          <- DEN_EVENT         -> 7Exx
                                                          xxxx 
                                                          xxxx
							  xxxx 
							  xxxx
							  xxxx
							  C1C1 
							  7EFF 
              WAIT_FOR_RESET_IDLE   <- D_UNDERRUN        <- (8ms)                        
              IDLE                  <> Reset pipe

              

  Transmit long frame (>= 16 bytes of encoded data):

  L1 FRAME    D_OUT_STATE           USB                  D CHANNEL
  --------    -----------           ---                  ---------

 -> [xx...xx] IDLE
              WAIT_FOR_STOP         <> OUT_D_COUNTER=0
              WAIT_FOR_RESET        <> Reset pipe
	      STOP
	      INIT_LONG_FRAME       -> [7Exx..xx]
              WAIT_DEN              <> OUT_D_COUNTER=16 
              OUT_NORMAL            <- DEN_EVENT       -> 7Exx
              END_OF_FRAME_BUSY     -> [xxxx]             xxxx 
              END_OF_FRAME_NOT_BUSY -> [xxxx]             xxxx
				    -> [xxxx]		  xxxx 
				    -> [C1C2]		  xxxx
				    -> [7EFF]		  xxxx
							  xxxx 
							  xxxx 
                                                          ....
							  xxxx
							  C1C2
							  7EFF
	                 	    <- D_UNDERRUN      <- (> 8ms)                        
              WAIT_FOR_STOP         <> OUT_D_COUNTER=0
              WAIT_FOR_RESET        <> Reset pipe
	      STOP

*/          

static struct Fsm dout_fsm;

static char *strDoutState[] =
{
	"ST_DOUT_NONE",

	"ST_DOUT_SHORT_INIT",
	"ST_DOUT_SHORT_WAIT_DEN",

	"ST_DOUT_LONG_INIT",
	"ST_DOUT_LONG_WAIT_DEN",
	"ST_DOUT_NORMAL",

	"ST_DOUT_WAIT_FOR_UNDERRUN",
        "ST_DOUT_WAIT_FOR_NOT_BUSY",
	"ST_DOUT_WAIT_FOR_STOP",
	"ST_DOUT_WAIT_FOR_RESET",
};

static char *strDoutEvent[] =
{
	"EV_DOUT_START_XMIT",
	"EV_DOUT_COMPLETE",
	"EV_DOUT_DEN",
	"EV_DOUT_RESETED",
	"EV_DOUT_STOPPED",
	"EV_DOUT_COLL",
	"EV_DOUT_UNDERRUN",
};

static void dout_debug(struct FsmInst *fi, char *fmt, ...)
{
	va_list args;
	char buf[256];
	
	va_start(args, fmt);
	vsprintf(buf, fmt, args);
	DBG(0x2, "%s", buf);
	va_end(args);
}

static void dout_stop_event(void *context)
{
	struct st5481_adapter *adapter = context;

	FsmEvent(&adapter->d_out.fsm, EV_DOUT_STOPPED, NULL);
}

/*
 * Start the transfer of a D channel frame.
 */
static void usb_d_out(struct st5481_adapter *adapter, int buf_nr)
{
	struct st5481_d_out *d_out = &adapter->d_out;
	struct urb *urb;
	unsigned int num_packets, packet_offset;
	int len, buf_size, bytes_sent;
	struct sk_buff *skb;
	struct usb_iso_packet_descriptor *desc;

	if (d_out->fsm.state != ST_DOUT_NORMAL)
		return;

	if (test_and_set_bit(buf_nr, &d_out->busy)) {
		DBG(2, "ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
		return;
	}
	urb = d_out->urb[buf_nr];

	skb = d_out->tx_skb;

	buf_size = NUM_ISO_PACKETS_D * SIZE_ISO_PACKETS_D_OUT;
	
	if (skb) {
		len = isdnhdlc_encode(&d_out->hdlc_state,
				      skb->data, skb->len, &bytes_sent,
				      urb->transfer_buffer, buf_size);
		skb_pull(skb,bytes_sent);
	} else {
		// Send flags or idle
		len = isdnhdlc_encode(&d_out->hdlc_state,
				      NULL, 0, &bytes_sent,
				      urb->transfer_buffer, buf_size);
	}
	
	if (len < buf_size) {
		FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_UNDERRUN);
	}
	if (skb && !skb->len) {
		d_out->tx_skb = NULL;
		D_L1L2(adapter, PH_DATA | CONFIRM, NULL);
		dev_kfree_skb_any(skb);
	}

	// Prepare the URB
	urb->transfer_buffer_length = len;
	num_packets = 0;
	packet_offset = 0;
	while (packet_offset < len) {
		desc = &urb->iso_frame_desc[num_packets];
		desc->offset = packet_offset;
		desc->length = SIZE_ISO_PACKETS_D_OUT;
		if (len - packet_offset < desc->length)
			desc->length = len - packet_offset;
		num_packets++;
		packet_offset += desc->length;
	}
	urb->number_of_packets = num_packets;

	// Prepare the URB
	urb->dev = adapter->usb_dev;
	// Need to transmit the next buffer 2ms after the DEN_EVENT
	urb->transfer_flags = 0;
	urb->start_frame = usb_get_current_frame_number(adapter->usb_dev)+2;

	DBG_ISO_PACKET(0x20,urb);

	if (usb_submit_urb(urb, GFP_KERNEL) < 0) {
		// There is another URB queued up
		urb->transfer_flags = URB_ISO_ASAP;
		SUBMIT_URB(urb, GFP_KERNEL);
	}	
}

static void fifo_reseted(void *context)
{
	struct st5481_adapter *adapter = context;

	FsmEvent(&adapter->d_out.fsm, EV_DOUT_RESETED, NULL);
}

static void usb_d_out_complete(struct urb *urb, struct pt_regs *regs)
{
	struct st5481_adapter *adapter = urb->context;
	struct st5481_d_out *d_out = &adapter->d_out;
	int buf_nr;
	
	DBG(2, "");

	buf_nr = get_buf_nr(d_out->urb, urb);
	test_and_clear_bit(buf_nr, &d_out->busy);

	if (unlikely(urb->status < 0)) {
		if (urb->status != -ENOENT && urb->status != -ESHUTDOWN) {
			WARN("urb status %d",urb->status);
			if (d_out->busy == 0) {
				st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, fifo_reseted, adapter);
			}
			return;
		} else {
			DBG(1,"urb killed"); 
			return; // Give up
		}
	}

	FsmEvent(&adapter->d_out.fsm, EV_DOUT_COMPLETE, (void *) buf_nr);
}

/* ====================================================================== */

static void dout_start_xmit(struct FsmInst *fsm, int event, void *arg)
{
	// FIXME unify?
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;
	struct urb *urb;
	int len, bytes_sent;
	struct sk_buff *skb;
	int buf_nr = 0;

	skb = d_out->tx_skb;

	DBG(2,"len=%d",skb->len);

	isdnhdlc_out_init(&d_out->hdlc_state, 1, 0);

	if (test_and_set_bit(buf_nr, &d_out->busy)) {
		WARN("ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
		return;
	}
	urb = d_out->urb[buf_nr];

	DBG_SKB(0x10, skb);
	len = isdnhdlc_encode(&d_out->hdlc_state,
			      skb->data, skb->len, &bytes_sent,
			      urb->transfer_buffer, 16);
	skb_pull(skb, bytes_sent);

	if(len < 16)
		FsmChangeState(&d_out->fsm, ST_DOUT_SHORT_INIT);
	else
		FsmChangeState(&d_out->fsm, ST_DOUT_LONG_INIT);

	if (skb->len == 0) {
		d_out->tx_skb = NULL;
		D_L1L2(adapter, PH_DATA | CONFIRM, NULL);
		dev_kfree_skb_any(skb);
	}

// Prepare the URB
	urb->transfer_buffer_length = len;

	urb->iso_frame_desc[0].offset = 0;
	urb->iso_frame_desc[0].length = len;
	urb->number_of_packets = 1;

	// Prepare the URB
	urb->dev = adapter->usb_dev;
	urb->transfer_flags = URB_ISO_ASAP;

	DBG_ISO_PACKET(0x20,urb);
	SUBMIT_URB(urb, GFP_KERNEL);
}

static void dout_short_fifo(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_SHORT_WAIT_DEN);
	st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 16, NULL, NULL);
}

static void dout_end_short_frame(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_UNDERRUN);
}

static void dout_long_enable_fifo(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;
    
	st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 16, NULL, NULL);
	FsmChangeState(&d_out->fsm, ST_DOUT_LONG_WAIT_DEN);
}

static void dout_long_den(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_NORMAL);
	usb_d_out(adapter, 0);
	usb_d_out(adapter, 1);
}

static void dout_reset(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_RESET);
	st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, fifo_reseted, adapter);
}

static void dout_stop(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_STOP);
	st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 0, dout_stop_event, adapter);
}

static void dout_underrun(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	if (test_bit(0, &d_out->busy) || test_bit(1, &d_out->busy)) {
		FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_NOT_BUSY);
	}  else {
		dout_stop(fsm, event, arg);
	}
}

static void dout_check_busy(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	if (!test_bit(0, &d_out->busy) && !test_bit(1, &d_out->busy))
		dout_stop(fsm, event, arg);
}

static void dout_reseted(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	struct st5481_d_out *d_out = &adapter->d_out;

	FsmChangeState(&d_out->fsm, ST_DOUT_NONE);
	// FIXME locking
	if (d_out->tx_skb)
		FsmEvent(&d_out->fsm, EV_DOUT_START_XMIT, NULL);
}

static void dout_complete(struct FsmInst *fsm, int event, void *arg)
{
	struct st5481_adapter *adapter = fsm->userdata;
	int buf_nr = (int) arg;

	usb_d_out(adapter, buf_nr);
}

static void dout_ignore(struct FsmInst *fsm, int event, void *arg)
{
}

static struct FsmNode DoutFnList[] __initdata =
{
	{ST_DOUT_NONE,                   EV_DOUT_START_XMIT,   dout_start_xmit},

	{ST_DOUT_SHORT_INIT,             EV_DOUT_COMPLETE,     dout_short_fifo},

	{ST_DOUT_SHORT_WAIT_DEN,         EV_DOUT_DEN,          dout_end_short_frame},
	{ST_DOUT_SHORT_WAIT_DEN,         EV_DOUT_UNDERRUN,     dout_underrun},

	{ST_DOUT_LONG_INIT,              EV_DOUT_COMPLETE,     dout_long_enable_fifo},

	{ST_DOUT_LONG_WAIT_DEN,          EV_DOUT_DEN,          dout_long_den},
	{ST_DOUT_LONG_WAIT_DEN,          EV_DOUT_UNDERRUN,     dout_underrun},

	{ST_DOUT_NORMAL,                 EV_DOUT_UNDERRUN,     dout_underrun},
	{ST_DOUT_NORMAL,                 EV_DOUT_COMPLETE,     dout_complete},

	{ST_DOUT_WAIT_FOR_UNDERRUN,      EV_DOUT_UNDERRUN,     dout_underrun},
	{ST_DOUT_WAIT_FOR_UNDERRUN,      EV_DOUT_COMPLETE,     dout_ignore},

	{ST_DOUT_WAIT_FOR_NOT_BUSY,      EV_DOUT_COMPLETE,     dout_check_busy},

	{ST_DOUT_WAIT_FOR_STOP,          EV_DOUT_STOPPED,      dout_reset},

	{ST_DOUT_WAIT_FOR_RESET,         EV_DOUT_RESETED,      dout_reseted},
};

void st5481_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg)
{
	struct st5481_adapter *adapter = hisax_d_if->priv;
	struct sk_buff *skb = arg;

	switch (pr) {
	case PH_ACTIVATE | REQUEST:
		FsmEvent(&adapter->l1m, EV_PH_ACTIVATE_REQ, NULL);
		break;
	case PH_DEACTIVATE | REQUEST:
		FsmEvent(&adapter->l1m, EV_PH_DEACTIVATE_REQ, NULL);
		break;
	case PH_DATA | REQUEST:
		DBG(2, "PH_DATA REQUEST len %d", skb->len);
		if (adapter->d_out.tx_skb)
			BUG();

		adapter->d_out.tx_skb = skb;
		FsmEvent(&adapter->d_out.fsm, EV_DOUT_START_XMIT, NULL);
		break;
	default:
		WARN("pr %#x\n", pr);
		break;
	}
}

/* ======================================================================
 */

/*
 * Start receiving on the D channel since entered state F7.
 */
static void ph_connect(struct st5481_adapter *adapter)
{
	struct st5481_d_out *d_out = &adapter->d_out;
	struct st5481_in *d_in = &adapter->d_in;

	DBG(8,"");
		
	FsmChangeState(&d_out->fsm, ST_DOUT_NONE);

	//	st5481_usb_device_ctrl_msg(adapter, FFMSK_D, OUT_UNDERRUN, NULL, NULL);
	st5481_usb_device_ctrl_msg(adapter, FFMSK_D, 0xfc, NULL, NULL);
	st5481_in_mode(d_in, L1_MODE_HDLC);

#ifdef LOOPBACK
	// Turn loopback on (data sent on B and D looped back)
	st5481_usb_device_ctrl_msg(cs, LBB, 0x04, NULL, NULL);
#endif

	st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, NULL, NULL);

	// Turn on the green LED to tell that we are in state F7
	adapter->leds |= GREEN_LED;
	st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
}

/*
 * Stop receiving on the D channel since not in state F7.
 */
static void ph_disconnect(struct st5481_adapter *adapter)
{
	DBG(8,"");

	st5481_in_mode(&adapter->d_in, L1_MODE_NULL);

	// Turn off the green LED to tell that we left state F7
	adapter->leds &= ~GREEN_LED;
	st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
}

static int st5481_setup_d_out(struct st5481_adapter *adapter)
{
	struct usb_device *dev = adapter->usb_dev;
	struct usb_interface *intf;
	struct usb_host_interface *altsetting = NULL;
	struct usb_host_endpoint *endpoint;
	struct st5481_d_out *d_out = &adapter->d_out;

	DBG(2,"");

	intf = usb_ifnum_to_if(dev, 0);
	if (intf)
		altsetting = usb_altnum_to_altsetting(intf, 3);
	if (!altsetting)
		return -ENXIO;

	// Allocate URBs and buffers for the D channel out
	endpoint = &altsetting->endpoint[EP_D_OUT-1];

	DBG(2,"endpoint address=%02x,packet size=%d",
	    endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize));

	return st5481_setup_isocpipes(d_out->urb, dev, 
				      usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress),
				      NUM_ISO_PACKETS_D, SIZE_ISO_PACKETS_D_OUT,
				      NUM_ISO_PACKETS_D * SIZE_ISO_PACKETS_D_OUT,
				      usb_d_out_complete, adapter);
}

static void st5481_release_d_out(struct st5481_adapter *adapter)
{
	struct st5481_d_out *d_out = &adapter->d_out;

	DBG(2,"");

	st5481_release_isocpipes(d_out->urb);
}

int st5481_setup_d(struct st5481_adapter *adapter)
{
	int retval;

	DBG(2,"");

	retval = st5481_setup_d_out(adapter);
	if (retval)
		goto err;
	adapter->d_in.bufsize = MAX_DFRAME_LEN_L1;
	adapter->d_in.num_packets = NUM_ISO_PACKETS_D;
	adapter->d_in.packet_size = SIZE_ISO_PACKETS_D_IN;
	adapter->d_in.ep = EP_D_IN | USB_DIR_IN;
	adapter->d_in.counter = IN_D_COUNTER;
	adapter->d_in.adapter = adapter;
	adapter->d_in.hisax_if = &adapter->hisax_d_if.ifc;
	retval = st5481_setup_in(&adapter->d_in);
	if (retval)
		goto err_d_out;

	adapter->l1m.fsm = &l1fsm;
	adapter->l1m.state = ST_L1_F3;
	adapter->l1m.debug = 1;
	adapter->l1m.userdata = adapter;
	adapter->l1m.printdebug = l1m_debug;
	FsmInitTimer(&adapter->l1m, &adapter->timer);

	adapter->d_out.fsm.fsm = &dout_fsm;
	adapter->d_out.fsm.state = ST_DOUT_NONE;
	adapter->d_out.fsm.debug = 1;
	adapter->d_out.fsm.userdata = adapter;
	adapter->d_out.fsm.printdebug = dout_debug;

	return 0;

 err_d_out:
	st5481_release_d_out(adapter);
 err:
	return retval;
}

void st5481_release_d(struct st5481_adapter *adapter)
{
	DBG(2,"");

	st5481_release_in(&adapter->d_in);
	st5481_release_d_out(adapter);
}

/* ======================================================================
 * init / exit
 */

int __init st5481_d_init(void)
{
	int retval;

	l1fsm.state_count = L1_STATE_COUNT;
	l1fsm.event_count = L1_EVENT_COUNT;
	l1fsm.strEvent = strL1Event;
	l1fsm.strState = strL1State;
	retval = FsmNew(&l1fsm, L1FnList, ARRAY_SIZE(L1FnList));
	if (retval)
		goto err;

	dout_fsm.state_count = DOUT_STATE_COUNT;
	dout_fsm.event_count = DOUT_EVENT_COUNT;
	dout_fsm.strEvent = strDoutEvent;
	dout_fsm.strState = strDoutState;
	retval = FsmNew(&dout_fsm, DoutFnList, ARRAY_SIZE(DoutFnList));
	if (retval)
		goto err_l1;

	return 0;

 err_l1:
	FsmFree(&l1fsm);
 err:
	return retval;
}

// can't be __exit
void st5481_d_exit(void)
{
	FsmFree(&l1fsm);
	FsmFree(&dout_fsm);
}