Bootlin logo

Elixir Cross Referencer

  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
/*
 * 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 "st5481.h"

static int st5481_isoc_flatten(struct urb *urb);

/* ======================================================================
 * control pipe
 */

/*
 * Send the next endpoint 0 request stored in the FIFO.
 * Called either by the completion or by usb_ctrl_msg.
 */
static void usb_next_ctrl_msg(struct urb *urb,
			      struct st5481_adapter *adapter)
{
	struct st5481_ctrl *ctrl = &adapter->ctrl;
	int r_index;

	if (test_and_set_bit(0, &ctrl->busy)) {
		return;
	}

	if ((r_index = fifo_remove(&ctrl->msg_fifo.f)) < 0) {
		test_and_clear_bit(0, &ctrl->busy);
		return;
	}
	urb->setup_packet =
		(unsigned char *)&ctrl->msg_fifo.data[r_index];

	DBG(1, "request=0x%02x,value=0x%04x,index=%x",
	    ((struct ctrl_msg *)urb->setup_packet)->dr.bRequest,
	    ((struct ctrl_msg *)urb->setup_packet)->dr.wValue,
	    ((struct ctrl_msg *)urb->setup_packet)->dr.wIndex);

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

	SUBMIT_URB(urb, GFP_ATOMIC);
}

/*
 * Asynchronous endpoint 0 request (async version of usb_control_msg).
 * The request will be queued up in a FIFO if the endpoint is busy.
 */
static void usb_ctrl_msg(struct st5481_adapter *adapter,
			 u8 request, u8 requesttype, u16 value, u16 index,
			 ctrl_complete_t complete, void *context)
{
	struct st5481_ctrl *ctrl = &adapter->ctrl;
	int w_index;
	struct ctrl_msg *ctrl_msg;

	if ((w_index = fifo_add(&ctrl->msg_fifo.f)) < 0) {
		WARNING("control msg FIFO full");
		return;
	}
	ctrl_msg = &ctrl->msg_fifo.data[w_index];

	ctrl_msg->dr.bRequestType = requesttype;
	ctrl_msg->dr.bRequest = request;
	ctrl_msg->dr.wValue = cpu_to_le16p(&value);
	ctrl_msg->dr.wIndex = cpu_to_le16p(&index);
	ctrl_msg->dr.wLength = 0;
	ctrl_msg->complete = complete;
	ctrl_msg->context = context;

	usb_next_ctrl_msg(ctrl->urb, adapter);
}

/*
 * Asynchronous endpoint 0 device request.
 */
void st5481_usb_device_ctrl_msg(struct st5481_adapter *adapter,
				u8 request, u16 value,
				ctrl_complete_t complete, void *context)
{
	usb_ctrl_msg(adapter, request,
		     USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		     value, 0, complete, context);
}

/*
 * Asynchronous pipe reset (async version of usb_clear_halt).
 */
void st5481_usb_pipe_reset(struct st5481_adapter *adapter,
			   u_char pipe,
			   ctrl_complete_t complete, void *context)
{
	DBG(1, "pipe=%02x", pipe);

	usb_ctrl_msg(adapter,
		     USB_REQ_CLEAR_FEATURE, USB_DIR_OUT | USB_RECIP_ENDPOINT,
		     0, pipe, complete, context);
}


/*
  Physical level functions
*/

void st5481_ph_command(struct st5481_adapter *adapter, unsigned int command)
{
	DBG(8, "command=%s", ST5481_CMD_string(command));

	st5481_usb_device_ctrl_msg(adapter, TXCI, command, NULL, NULL);
}

/*
 * The request on endpoint 0 has completed.
 * Call the user provided completion routine and try
 * to send the next request.
 */
static void usb_ctrl_complete(struct urb *urb)
{
	struct st5481_adapter *adapter = urb->context;
	struct st5481_ctrl *ctrl = &adapter->ctrl;
	struct ctrl_msg *ctrl_msg;

	if (unlikely(urb->status < 0)) {
		switch (urb->status) {
		case -ENOENT:
		case -ESHUTDOWN:
		case -ECONNRESET:
			DBG(1, "urb killed status %d", urb->status);
			return; // Give up
		default:
			WARNING("urb status %d", urb->status);
			break;
		}
	}

	ctrl_msg = (struct ctrl_msg *)urb->setup_packet;

	if (ctrl_msg->dr.bRequest == USB_REQ_CLEAR_FEATURE) {
		/* Special case handling for pipe reset */
		le16_to_cpus(&ctrl_msg->dr.wIndex);
		usb_reset_endpoint(adapter->usb_dev, ctrl_msg->dr.wIndex);
	}

	if (ctrl_msg->complete)
		ctrl_msg->complete(ctrl_msg->context);

	clear_bit(0, &ctrl->busy);

	// Try to send next control message
	usb_next_ctrl_msg(urb, adapter);
	return;
}

/* ======================================================================
 * interrupt pipe
 */

/*
 * The interrupt endpoint will be called when any
 * of the 6 registers changes state (depending on masks).
 * Decode the register values and schedule a private event.
 * Called at interrupt.
 */
static void usb_int_complete(struct urb *urb)
{
	u8 *data = urb->transfer_buffer;
	u8 irqbyte;
	struct st5481_adapter *adapter = urb->context;
	int j;
	int status;

	switch (urb->status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		DBG(2, "urb shutting down with status: %d", urb->status);
		return;
	default:
		WARNING("nonzero urb status received: %d", urb->status);
		goto exit;
	}


	DBG_PACKET(2, data, INT_PKT_SIZE);

	if (urb->actual_length == 0) {
		goto exit;
	}

	irqbyte = data[MPINT];
	if (irqbyte & DEN_INT)
		FsmEvent(&adapter->d_out.fsm, EV_DOUT_DEN, NULL);

	if (irqbyte & DCOLL_INT)
		FsmEvent(&adapter->d_out.fsm, EV_DOUT_COLL, NULL);

	irqbyte = data[FFINT_D];
	if (irqbyte & OUT_UNDERRUN)
		FsmEvent(&adapter->d_out.fsm, EV_DOUT_UNDERRUN, NULL);

	if (irqbyte & OUT_DOWN)
		;//		printk("OUT_DOWN\n");

	irqbyte = data[MPINT];
	if (irqbyte & RXCI_INT)
		FsmEvent(&adapter->l1m, data[CCIST] & 0x0f, NULL);

	for (j = 0; j < 2; j++)
		adapter->bcs[j].b_out.flow_event |= data[FFINT_B1 + j];

	urb->actual_length = 0;

exit:
	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status)
		WARNING("usb_submit_urb failed with result %d", status);
}

/* ======================================================================
 * initialization
 */

int st5481_setup_usb(struct st5481_adapter *adapter)
{
	struct usb_device *dev = adapter->usb_dev;
	struct st5481_ctrl *ctrl = &adapter->ctrl;
	struct st5481_intr *intr = &adapter->intr;
	struct usb_interface *intf;
	struct usb_host_interface *altsetting = NULL;
	struct usb_host_endpoint *endpoint;
	int status;
	struct urb *urb;
	u8 *buf;

	DBG(2, "");

	if ((status = usb_reset_configuration(dev)) < 0) {
		WARNING("reset_configuration failed,status=%d", status);
		return status;
	}

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

	// Check if the config is sane
	if (altsetting->desc.bNumEndpoints != 7) {
		WARNING("expecting 7 got %d endpoints!", altsetting->desc.bNumEndpoints);
		return -EINVAL;
	}

	// The descriptor is wrong for some early samples of the ST5481 chip
	altsetting->endpoint[3].desc.wMaxPacketSize = __constant_cpu_to_le16(32);
	altsetting->endpoint[4].desc.wMaxPacketSize = __constant_cpu_to_le16(32);

	// Use alternative setting 3 on interface 0 to have 2B+D
	if ((status = usb_set_interface(dev, 0, 3)) < 0) {
		WARNING("usb_set_interface failed,status=%d", status);
		return status;
	}

	// Allocate URB for control endpoint
	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		return -ENOMEM;
	}
	ctrl->urb = urb;

	// Fill the control URB
	usb_fill_control_urb(urb, dev,
			     usb_sndctrlpipe(dev, 0),
			     NULL, NULL, 0, usb_ctrl_complete, adapter);


	fifo_init(&ctrl->msg_fifo.f, ARRAY_SIZE(ctrl->msg_fifo.data));

	// Allocate URBs and buffers for interrupt endpoint
	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		goto err1;
	}
	intr->urb = urb;

	buf = kmalloc(INT_PKT_SIZE, GFP_KERNEL);
	if (!buf) {
		goto err2;
	}

	endpoint = &altsetting->endpoint[EP_INT-1];

	// Fill the interrupt URB
	usb_fill_int_urb(urb, dev,
			 usb_rcvintpipe(dev, endpoint->desc.bEndpointAddress),
			 buf, INT_PKT_SIZE,
			 usb_int_complete, adapter,
			 endpoint->desc.bInterval);

	return 0;
err2:
	usb_free_urb(intr->urb);
	intr->urb = NULL;
err1:
	usb_free_urb(ctrl->urb);
	ctrl->urb = NULL;

	return -ENOMEM;
}

/*
 * Release buffers and URBs for the interrupt and control
 * endpoint.
 */
void st5481_release_usb(struct st5481_adapter *adapter)
{
	struct st5481_intr *intr = &adapter->intr;
	struct st5481_ctrl *ctrl = &adapter->ctrl;

	DBG(1, "");

	// Stop and free Control and Interrupt URBs
	usb_kill_urb(ctrl->urb);
	kfree(ctrl->urb->transfer_buffer);
	usb_free_urb(ctrl->urb);
	ctrl->urb = NULL;

	usb_kill_urb(intr->urb);
	kfree(intr->urb->transfer_buffer);
	usb_free_urb(intr->urb);
	intr->urb = NULL;
}

/*
 *  Initialize the adapter.
 */
void st5481_start(struct st5481_adapter *adapter)
{
	static const u8 init_cmd_table[] = {
		SET_DEFAULT, 0,
		STT, 0,
		SDA_MIN, 0x0d,
		SDA_MAX, 0x29,
		SDELAY_VALUE, 0x14,
		GPIO_DIR, 0x01,
		GPIO_OUT, RED_LED,
//		FFCTRL_OUT_D,4,
//		FFCTRH_OUT_D,12,
		FFCTRL_OUT_B1, 6,
		FFCTRH_OUT_B1, 20,
		FFCTRL_OUT_B2, 6,
		FFCTRH_OUT_B2, 20,
		MPMSK, RXCI_INT + DEN_INT + DCOLL_INT,
		0
	};
	struct st5481_intr *intr = &adapter->intr;
	int i = 0;
	u8 request, value;

	DBG(8, "");

	adapter->leds = RED_LED;

	// Start receiving on the interrupt endpoint
	SUBMIT_URB(intr->urb, GFP_KERNEL);

	while ((request = init_cmd_table[i++])) {
		value = init_cmd_table[i++];
		st5481_usb_device_ctrl_msg(adapter, request, value, NULL, NULL);
	}
	st5481_ph_command(adapter, ST5481_CMD_PUP);
}

/*
 * Reset the adapter to default values.
 */
void st5481_stop(struct st5481_adapter *adapter)
{
	DBG(8, "");

	st5481_usb_device_ctrl_msg(adapter, SET_DEFAULT, 0, NULL, NULL);
}

/* ======================================================================
 * isochronous USB  helpers
 */

static void
fill_isoc_urb(struct urb *urb, struct usb_device *dev,
	      unsigned int pipe, void *buf, int num_packets,
	      int packet_size, usb_complete_t complete,
	      void *context)
{
	int k;

	urb->dev = dev;
	urb->pipe = pipe;
	urb->interval = 1;
	urb->transfer_buffer = buf;
	urb->number_of_packets = num_packets;
	urb->transfer_buffer_length = num_packets * packet_size;
	urb->actual_length = 0;
	urb->complete = complete;
	urb->context = context;
	urb->transfer_flags = URB_ISO_ASAP;
	for (k = 0; k < num_packets; k++) {
		urb->iso_frame_desc[k].offset = packet_size * k;
		urb->iso_frame_desc[k].length = packet_size;
		urb->iso_frame_desc[k].actual_length = 0;
	}
}

int
st5481_setup_isocpipes(struct urb *urb[2], struct usb_device *dev,
		       unsigned int pipe, int num_packets,
		       int packet_size, int buf_size,
		       usb_complete_t complete, void *context)
{
	int j, retval;
	unsigned char *buf;

	for (j = 0; j < 2; j++) {
		retval = -ENOMEM;
		urb[j] = usb_alloc_urb(num_packets, GFP_KERNEL);
		if (!urb[j])
			goto err;

		// Allocate memory for 2000bytes/sec (16Kb/s)
		buf = kmalloc(buf_size, GFP_KERNEL);
		if (!buf)
			goto err;

		// Fill the isochronous URB
		fill_isoc_urb(urb[j], dev, pipe, buf,
			      num_packets, packet_size, complete,
			      context);
	}
	return 0;

err:
	for (j = 0; j < 2; j++) {
		if (urb[j]) {
			kfree(urb[j]->transfer_buffer);
			urb[j]->transfer_buffer = NULL;
			usb_free_urb(urb[j]);
			urb[j] = NULL;
		}
	}
	return retval;
}

void st5481_release_isocpipes(struct urb *urb[2])
{
	int j;

	for (j = 0; j < 2; j++) {
		usb_kill_urb(urb[j]);
		kfree(urb[j]->transfer_buffer);
		usb_free_urb(urb[j]);
		urb[j] = NULL;
	}
}

/*
 * Decode frames received on the B/D channel.
 * Note that this function will be called continuously
 * with 64Kbit/s / 16Kbit/s of data and hence it will be
 * called 50 times per second with 20 ISOC descriptors.
 * Called at interrupt.
 */
static void usb_in_complete(struct urb *urb)
{
	struct st5481_in *in = urb->context;
	unsigned char *ptr;
	struct sk_buff *skb;
	int len, count, status;

	if (unlikely(urb->status < 0)) {
		switch (urb->status) {
		case -ENOENT:
		case -ESHUTDOWN:
		case -ECONNRESET:
			DBG(1, "urb killed status %d", urb->status);
			return; // Give up
		default:
			WARNING("urb status %d", urb->status);
			break;
		}
	}

	DBG_ISO_PACKET(0x80, urb);

	len = st5481_isoc_flatten(urb);
	ptr = urb->transfer_buffer;
	while (len > 0) {
		if (in->mode == L1_MODE_TRANS) {
			memcpy(in->rcvbuf, ptr, len);
			status = len;
			len = 0;
		} else {
			status = isdnhdlc_decode(&in->hdlc_state, ptr, len, &count,
						 in->rcvbuf, in->bufsize);
			ptr += count;
			len -= count;
		}

		if (status > 0) {
			// Good frame received
			DBG(4, "count=%d", status);
			DBG_PACKET(0x400, in->rcvbuf, status);
			if (!(skb = dev_alloc_skb(status))) {
				WARNING("receive out of memory\n");
				break;
			}
			memcpy(skb_put(skb, status), in->rcvbuf, status);
			in->hisax_if->l1l2(in->hisax_if, PH_DATA | INDICATION, skb);
		} else if (status == -HDLC_CRC_ERROR) {
			INFO("CRC error");
		} else if (status == -HDLC_FRAMING_ERROR) {
			INFO("framing error");
		} else if (status == -HDLC_LENGTH_ERROR) {
			INFO("length error");
		}
	}

	// Prepare URB for next transfer
	urb->dev = in->adapter->usb_dev;
	urb->actual_length = 0;

	SUBMIT_URB(urb, GFP_ATOMIC);
}

int st5481_setup_in(struct st5481_in *in)
{
	struct usb_device *dev = in->adapter->usb_dev;
	int retval;

	DBG(4, "");

	in->rcvbuf = kmalloc(in->bufsize, GFP_KERNEL);
	retval = -ENOMEM;
	if (!in->rcvbuf)
		goto err;

	retval = st5481_setup_isocpipes(in->urb, dev,
					usb_rcvisocpipe(dev, in->ep),
					in->num_packets,  in->packet_size,
					in->num_packets * in->packet_size,
					usb_in_complete, in);
	if (retval)
		goto err_free;
	return 0;

err_free:
	kfree(in->rcvbuf);
err:
	return retval;
}

void st5481_release_in(struct st5481_in *in)
{
	DBG(2, "");

	st5481_release_isocpipes(in->urb);
}

/*
 * Make the transfer_buffer contiguous by
 * copying from the iso descriptors if necessary.
 */
static int st5481_isoc_flatten(struct urb *urb)
{
	struct usb_iso_packet_descriptor *pipd, *pend;
	unsigned char *src, *dst;
	unsigned int len;

	if (urb->status < 0) {
		return urb->status;
	}
	for (pipd = &urb->iso_frame_desc[0],
		     pend = &urb->iso_frame_desc[urb->number_of_packets],
		     dst = urb->transfer_buffer;
	     pipd < pend;
	     pipd++) {

		if (pipd->status < 0) {
			return (pipd->status);
		}

		len = pipd->actual_length;
		pipd->actual_length = 0;
		src = urb->transfer_buffer + pipd->offset;

		if (src != dst) {
			// Need to copy since isoc buffers not full
			while (len--) {
				*dst++ = *src++;
			}
		} else {
			// No need to copy, just update destination buffer
			dst += len;
		}
	}
	// Return size of flattened buffer
	return (dst - (unsigned char *)urb->transfer_buffer);
}

static void st5481_start_rcv(void *context)
{
	struct st5481_in *in = context;
	struct st5481_adapter *adapter = in->adapter;

	DBG(4, "");

	in->urb[0]->dev = adapter->usb_dev;
	SUBMIT_URB(in->urb[0], GFP_KERNEL);

	in->urb[1]->dev = adapter->usb_dev;
	SUBMIT_URB(in->urb[1], GFP_KERNEL);
}

void st5481_in_mode(struct st5481_in *in, int mode)
{
	if (in->mode == mode)
		return;

	in->mode = mode;

	usb_unlink_urb(in->urb[0]);
	usb_unlink_urb(in->urb[1]);

	if (in->mode != L1_MODE_NULL) {
		if (in->mode != L1_MODE_TRANS) {
			u32 features = HDLC_BITREVERSE;

			if (in->mode == L1_MODE_HDLC_56K)
				features |= HDLC_56KBIT;
			isdnhdlc_rcv_init(&in->hdlc_state, features);
		}
		st5481_usb_pipe_reset(in->adapter, in->ep, NULL, NULL);
		st5481_usb_device_ctrl_msg(in->adapter, in->counter,
					   in->packet_size,
					   NULL, NULL);
		st5481_start_rcv(in);
	} else {
		st5481_usb_device_ctrl_msg(in->adapter, in->counter,
					   0, NULL, NULL);
	}
}