summaryrefslogtreecommitdiffstats
path: root/drivers/media/video/cpia2/cpia2_usb.c
blob: dc5b07a20f693a50a4af0cdc7a2b93fb5ff3c2f7 (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
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
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
/****************************************************************************
 *
 *  Filename: cpia2_usb.c
 *
 *  Copyright 2001, STMicrolectronics, Inc.
 *      Contact:  steve.miller@st.com
 *
 *  Description:
 *     This is a USB driver for CPia2 based video cameras.
 *     The infrastructure of this driver is based on the cpia usb driver by
 *     Jochen Scharrlach and Johannes Erdfeldt.
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  Stripped of 2.4 stuff ready for main kernel submit by
 *		Alan Cox <alan@lxorguk.ukuu.org.uk>
 ****************************************************************************/

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include "cpia2.h"

static int frame_sizes[] = {
	0,	// USBIF_CMDONLY
	0, 	// USBIF_BULK
	128, 	// USBIF_ISO_1
	384, 	// USBIF_ISO_2
	640, 	// USBIF_ISO_3
	768, 	// USBIF_ISO_4
	896, 	// USBIF_ISO_5
	1023, 	// USBIF_ISO_6
};

#define FRAMES_PER_DESC    10
#define FRAME_SIZE_PER_DESC   frame_sizes[cam->cur_alt]

static void process_frame(struct camera_data *cam);
static void cpia2_usb_complete(struct urb *urb);
static int cpia2_usb_probe(struct usb_interface *intf,
			   const struct usb_device_id *id);
static void cpia2_usb_disconnect(struct usb_interface *intf);

static void free_sbufs(struct camera_data *cam);
static void add_APPn(struct camera_data *cam);
static void add_COM(struct camera_data *cam);
static int submit_urbs(struct camera_data *cam);
static int set_alternate(struct camera_data *cam, unsigned int alt);
static int configure_transfer_mode(struct camera_data *cam, unsigned int alt);

static struct usb_device_id cpia2_id_table[] = {
	{USB_DEVICE(0x0553, 0x0100)},
	{USB_DEVICE(0x0553, 0x0140)},
	{USB_DEVICE(0x0553, 0x0151)},  /* STV0676 */
	{}			/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, cpia2_id_table);

static struct usb_driver cpia2_driver = {
	.name		= "cpia2",
	.probe		= cpia2_usb_probe,
	.disconnect	= cpia2_usb_disconnect,
	.id_table	= cpia2_id_table
};


/******************************************************************************
 *
 *  process_frame
 *
 *****************************************************************************/
static void process_frame(struct camera_data *cam)
{
	static int frame_count;

	unsigned char *inbuff = cam->workbuff->data;

	DBG("Processing frame #%d, current:%d\n",
	    cam->workbuff->num, cam->curbuff->num);

	if(cam->workbuff->length > cam->workbuff->max_length)
		cam->workbuff->max_length = cam->workbuff->length;

	if ((inbuff[0] == 0xFF) && (inbuff[1] == 0xD8)) {
		frame_count++;
	} else {
		cam->workbuff->status = FRAME_ERROR;
		DBG("Start of frame not found\n");
		return;
	}

	/***
	 * Now the output buffer should have a JPEG image in it.
	 ***/
	if(!cam->first_image_seen) {
		/* Always skip the first image after streaming
		 * starts. It is almost certainly corrupt. */
		cam->first_image_seen = 1;
		cam->workbuff->status = FRAME_EMPTY;
		return;
	}
	if (cam->workbuff->length > 3) {
		if(cam->mmapped &&
		   cam->workbuff->length < cam->workbuff->max_length) {
			/* No junk in the buffers */
			memset(cam->workbuff->data+cam->workbuff->length,
			       0, cam->workbuff->max_length-
				  cam->workbuff->length);
		}
		cam->workbuff->max_length = cam->workbuff->length;
		cam->workbuff->status = FRAME_READY;

		if(!cam->mmapped && cam->num_frames > 2) {
			/* During normal reading, the most recent
			 * frame will be read.  If the current frame
			 * hasn't started reading yet, it will never
			 * be read, so mark it empty.  If the buffer is
			 * mmapped, or we have few buffers, we need to
			 * wait for the user to free the buffer.
			 *
			 * NOTE: This is not entirely foolproof with 3
			 * buffers, but it would take an EXTREMELY
			 * overloaded system to cause problems (possible
			 * image data corruption).  Basically, it would
			 * need to take more time to execute cpia2_read
			 * than it would for the camera to send
			 * cam->num_frames-2 frames before problems
			 * could occur.
			 */
			cam->curbuff->status = FRAME_EMPTY;
		}
		cam->curbuff = cam->workbuff;
		cam->workbuff = cam->workbuff->next;
		DBG("Changed buffers, work:%d, current:%d\n",
		    cam->workbuff->num, cam->curbuff->num);
		return;
	} else {
		DBG("Not enough data for an image.\n");
	}

	cam->workbuff->status = FRAME_ERROR;
	return;
}

/******************************************************************************
 *
 *  add_APPn
 *
 *  Adds a user specified APPn record
 *****************************************************************************/
static void add_APPn(struct camera_data *cam)
{
	if(cam->APP_len > 0) {
		cam->workbuff->data[cam->workbuff->length++] = 0xFF;
		cam->workbuff->data[cam->workbuff->length++] = 0xE0+cam->APPn;
		cam->workbuff->data[cam->workbuff->length++] = 0;
		cam->workbuff->data[cam->workbuff->length++] = cam->APP_len+2;
		memcpy(cam->workbuff->data+cam->workbuff->length,
		       cam->APP_data, cam->APP_len);
		cam->workbuff->length += cam->APP_len;
	}
}

/******************************************************************************
 *
 *  add_COM
 *
 *  Adds a user specified COM record
 *****************************************************************************/
static void add_COM(struct camera_data *cam)
{
	if(cam->COM_len > 0) {
		cam->workbuff->data[cam->workbuff->length++] = 0xFF;
		cam->workbuff->data[cam->workbuff->length++] = 0xFE;
		cam->workbuff->data[cam->workbuff->length++] = 0;
		cam->workbuff->data[cam->workbuff->length++] = cam->COM_len+2;
		memcpy(cam->workbuff->data+cam->workbuff->length,
		       cam->COM_data, cam->COM_len);
		cam->workbuff->length += cam->COM_len;
	}
}

/******************************************************************************
 *
 *  cpia2_usb_complete
 *
 *  callback when incoming packet is received
 *****************************************************************************/
static void cpia2_usb_complete(struct urb *urb)
{
	int i;
	unsigned char *cdata;
	static int frame_ready = false;
	struct camera_data *cam = (struct camera_data *) urb->context;

	if (urb->status!=0) {
		if (!(urb->status == -ENOENT ||
		      urb->status == -ECONNRESET ||
		      urb->status == -ESHUTDOWN))
		{
			DBG("urb->status = %d!\n", urb->status);
		}
		DBG("Stopping streaming\n");
		return;
	}

	if (!cam->streaming || !cam->present || cam->open_count == 0) {
		LOG("Will now stop the streaming: streaming = %d, "
		    "present=%d, open_count=%d\n",
		    cam->streaming, cam->present, cam->open_count);
		return;
	}

	/***
	 * Packet collater
	 ***/
	//DBG("Collating %d packets\n", urb->number_of_packets);
	for (i = 0; i < urb->number_of_packets; i++) {
		u16 checksum, iso_checksum;
		int j;
		int n = urb->iso_frame_desc[i].actual_length;
		int st = urb->iso_frame_desc[i].status;

		if(cam->workbuff->status == FRAME_READY) {
			struct framebuf *ptr;
			/* Try to find an available buffer */
			DBG("workbuff full, searching\n");
			for (ptr = cam->workbuff->next;
			     ptr != cam->workbuff;
			     ptr = ptr->next)
			{
				if (ptr->status == FRAME_EMPTY) {
					ptr->status = FRAME_READING;
					ptr->length = 0;
					break;
				}
			}
			if (ptr == cam->workbuff)
				break; /* No READING or EMPTY buffers left */

			cam->workbuff = ptr;
		}

		if (cam->workbuff->status == FRAME_EMPTY ||
		    cam->workbuff->status == FRAME_ERROR) {
			cam->workbuff->status = FRAME_READING;
			cam->workbuff->length = 0;
		}

		//DBG("   Packet %d length = %d, status = %d\n", i, n, st);
		cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;

		if (st) {
			LOG("cpia2 data error: [%d] len=%d, status = %d\n",
			    i, n, st);
			if(!ALLOW_CORRUPT)
				cam->workbuff->status = FRAME_ERROR;
			continue;
		}

		if(n<=2)
			continue;

		checksum = 0;
		for(j=0; j<n-2; ++j)
			checksum += cdata[j];
		iso_checksum = cdata[j] + cdata[j+1]*256;
		if(checksum != iso_checksum) {
			LOG("checksum mismatch: [%d] len=%d, calculated = %x, checksum = %x\n",
			    i, n, (int)checksum, (int)iso_checksum);
			if(!ALLOW_CORRUPT) {
				cam->workbuff->status = FRAME_ERROR;
				continue;
			}
		}
		n -= 2;

		if(cam->workbuff->status != FRAME_READING) {
			if((0xFF == cdata[0] && 0xD8 == cdata[1]) ||
			   (0xD8 == cdata[0] && 0xFF == cdata[1] &&
			    0 != cdata[2])) {
				/* frame is skipped, but increment total
				 * frame count anyway */
				cam->frame_count++;
			}
			DBG("workbuff not reading, status=%d\n",
			    cam->workbuff->status);
			continue;
		}

		if (cam->frame_size < cam->workbuff->length + n) {
			ERR("buffer overflow! length: %d, n: %d\n",
			    cam->workbuff->length, n);
			cam->workbuff->status = FRAME_ERROR;
			if(cam->workbuff->length > cam->workbuff->max_length)
				cam->workbuff->max_length =
					cam->workbuff->length;
			continue;
		}

		if (cam->workbuff->length == 0) {
			int data_offset;
			if ((0xD8 == cdata[0]) && (0xFF == cdata[1])) {
				data_offset = 1;
			} else if((0xFF == cdata[0]) && (0xD8 == cdata[1])
				  && (0xFF == cdata[2])) {
				data_offset = 2;
			} else {
				DBG("Ignoring packet, not beginning!\n");
				continue;
			}
			DBG("Start of frame pattern found\n");
			do_gettimeofday(&cam->workbuff->timestamp);
			cam->workbuff->seq = cam->frame_count++;
			cam->workbuff->data[0] = 0xFF;
			cam->workbuff->data[1] = 0xD8;
			cam->workbuff->length = 2;
			add_APPn(cam);
			add_COM(cam);
			memcpy(cam->workbuff->data+cam->workbuff->length,
			       cdata+data_offset, n-data_offset);
			cam->workbuff->length += n-data_offset;
		} else if (cam->workbuff->length > 0) {
			memcpy(cam->workbuff->data + cam->workbuff->length,
			       cdata, n);
			cam->workbuff->length += n;
		}

		if ((cam->workbuff->length >= 3) &&
		    (cam->workbuff->data[cam->workbuff->length - 3] == 0xFF) &&
		    (cam->workbuff->data[cam->workbuff->length - 2] == 0xD9) &&
		    (cam->workbuff->data[cam->workbuff->length - 1] == 0xFF)) {
			frame_ready = true;
			cam->workbuff->data[cam->workbuff->length - 1] = 0;
			cam->workbuff->length -= 1;
		} else if ((cam->workbuff->length >= 2) &&
		   (cam->workbuff->data[cam->workbuff->length - 2] == 0xFF) &&
		   (cam->workbuff->data[cam->workbuff->length - 1] == 0xD9)) {
			frame_ready = true;
		}

		if (frame_ready) {
			DBG("Workbuff image size = %d\n",cam->workbuff->length);
			process_frame(cam);

			frame_ready = false;

			if (waitqueue_active(&cam->wq_stream))
				wake_up_interruptible(&cam->wq_stream);
		}
	}

	if(cam->streaming) {
		/* resubmit */
		urb->dev = cam->dev;
		if ((i = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
			ERR("%s: usb_submit_urb ret %d!\n", __func__, i);
	}
}

/******************************************************************************
 *
 * configure_transfer_mode
 *
 *****************************************************************************/
static int configure_transfer_mode(struct camera_data *cam, unsigned int alt)
{
	static unsigned char iso_regs[8][4] = {
		{0x00, 0x00, 0x00, 0x00},
		{0x00, 0x00, 0x00, 0x00},
		{0xB9, 0x00, 0x00, 0x7E},
		{0xB9, 0x00, 0x01, 0x7E},
		{0xB9, 0x00, 0x02, 0x7E},
		{0xB9, 0x00, 0x02, 0xFE},
		{0xB9, 0x00, 0x03, 0x7E},
		{0xB9, 0x00, 0x03, 0xFD}
	};
	struct cpia2_command cmd;
	unsigned char reg;

	if(!cam->present)
		return -ENODEV;

	/***
	 * Write the isoc registers according to the alternate selected
	 ***/
	cmd.direction = TRANSFER_WRITE;
	cmd.buffer.block_data[0] = iso_regs[alt][0];
	cmd.buffer.block_data[1] = iso_regs[alt][1];
	cmd.buffer.block_data[2] = iso_regs[alt][2];
	cmd.buffer.block_data[3] = iso_regs[alt][3];
	cmd.req_mode = CAMERAACCESS_TYPE_BLOCK | CAMERAACCESS_VC;
	cmd.start = CPIA2_VC_USB_ISOLIM;
	cmd.reg_count = 4;
	cpia2_send_command(cam, &cmd);

	/***
	 * Enable relevant streams before starting polling.
	 * First read USB Stream Config Register.
	 ***/
	cmd.direction = TRANSFER_READ;
	cmd.req_mode = CAMERAACCESS_TYPE_BLOCK | CAMERAACCESS_VC;
	cmd.start = CPIA2_VC_USB_STRM;
	cmd.reg_count = 1;
	cpia2_send_command(cam, &cmd);
	reg = cmd.buffer.block_data[0];

	/* Clear iso, bulk, and int */
	reg &= ~(CPIA2_VC_USB_STRM_BLK_ENABLE |
		 CPIA2_VC_USB_STRM_ISO_ENABLE |
		 CPIA2_VC_USB_STRM_INT_ENABLE);

	if (alt == USBIF_BULK) {
		DBG("Enabling bulk xfer\n");
		reg |= CPIA2_VC_USB_STRM_BLK_ENABLE;	/* Enable Bulk */
		cam->xfer_mode = XFER_BULK;
	} else if (alt >= USBIF_ISO_1) {
		DBG("Enabling ISOC xfer\n");
		reg |= CPIA2_VC_USB_STRM_ISO_ENABLE;
		cam->xfer_mode = XFER_ISOC;
	}

	cmd.buffer.block_data[0] = reg;
	cmd.direction = TRANSFER_WRITE;
	cmd.start = CPIA2_VC_USB_STRM;
	cmd.reg_count = 1;
	cmd.req_mode = CAMERAACCESS_TYPE_BLOCK | CAMERAACCESS_VC;
	cpia2_send_command(cam, &cmd);

	return 0;
}

/******************************************************************************
 *
 * cpia2_usb_change_streaming_alternate
 *
 *****************************************************************************/
int cpia2_usb_change_streaming_alternate(struct camera_data *cam,
					 unsigned int alt)
{
	int ret = 0;

	if(alt < USBIF_ISO_1 || alt > USBIF_ISO_6)
		return -EINVAL;

	if(alt == cam->params.camera_state.stream_mode)
		return 0;

	cpia2_usb_stream_pause(cam);

	configure_transfer_mode(cam, alt);

	cam->params.camera_state.stream_mode = alt;

	/* Reset the camera to prevent image quality degradation */
	cpia2_reset_camera(cam);

	cpia2_usb_stream_resume(cam);

	return ret;
}

/******************************************************************************
 *
 * set_alternate
 *
 *****************************************************************************/
static int set_alternate(struct camera_data *cam, unsigned int alt)
{
	int ret = 0;

	if(alt == cam->cur_alt)
		return 0;

	if (cam->cur_alt != USBIF_CMDONLY) {
		DBG("Changing from alt %d to %d\n", cam->cur_alt, USBIF_CMDONLY);
		ret = usb_set_interface(cam->dev, cam->iface, USBIF_CMDONLY);
		if (ret != 0)
			return ret;
	}
	if (alt != USBIF_CMDONLY) {
		DBG("Changing from alt %d to %d\n", USBIF_CMDONLY, alt);
		ret = usb_set_interface(cam->dev, cam->iface, alt);
		if (ret != 0)
			return ret;
	}

	cam->old_alt = cam->cur_alt;
	cam->cur_alt = alt;

	return ret;
}

/******************************************************************************
 *
 * free_sbufs
 *
 * Free all cam->sbuf[]. All non-NULL .data and .urb members that are non-NULL
 * are assumed to be allocated. Non-NULL .urb members are also assumed to be
 * submitted (and must therefore be killed before they are freed).
 *****************************************************************************/
static void free_sbufs(struct camera_data *cam)
{
	int i;

	for (i = 0; i < NUM_SBUF; i++) {
		if(cam->sbuf[i].urb) {
			usb_kill_urb(cam->sbuf[i].urb);
			usb_free_urb(cam->sbuf[i].urb);
			cam->sbuf[i].urb = NULL;
		}
		if(cam->sbuf[i].data) {
			kfree(cam->sbuf[i].data);
			cam->sbuf[i].data = NULL;
		}
	}
}

/*******
* Convenience functions
*******/
/****************************************************************************
 *
 *  write_packet
 *
 ***************************************************************************/
static int write_packet(struct usb_device *udev,
			u8 request, u8 * registers, u16 start, size_t size)
{
	if (!registers || size <= 0)
		return -EINVAL;

	return usb_control_msg(udev,
			       usb_sndctrlpipe(udev, 0),
			       request,
			       USB_TYPE_VENDOR | USB_RECIP_DEVICE,
			       start,	/* value */
			       0,	/* index */
			       registers,	/* buffer */
			       size,
			       HZ);
}

/****************************************************************************
 *
 *  read_packet
 *
 ***************************************************************************/
static int read_packet(struct usb_device *udev,
		       u8 request, u8 * registers, u16 start, size_t size)
{
	if (!registers || size <= 0)
		return -EINVAL;

	return usb_control_msg(udev,
			       usb_rcvctrlpipe(udev, 0),
			       request,
			       USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_DEVICE,
			       start,	/* value */
			       0,	/* index */
			       registers,	/* buffer */
			       size,
			       HZ);
}

/******************************************************************************
 *
 *  cpia2_usb_transfer_cmd
 *
 *****************************************************************************/
int cpia2_usb_transfer_cmd(struct camera_data *cam,
			   void *registers,
			   u8 request, u8 start, u8 count, u8 direction)
{
	int err = 0;
	struct usb_device *udev = cam->dev;

	if (!udev) {
		ERR("%s: Internal driver error: udev is NULL\n", __func__);
		return -EINVAL;
	}

	if (!registers) {
		ERR("%s: Internal driver error: register array is NULL\n", __func__);
		return -EINVAL;
	}

	if (direction == TRANSFER_READ) {
		err = read_packet(udev, request, (u8 *)registers, start, count);
		if (err > 0)
			err = 0;
	} else if (direction == TRANSFER_WRITE) {
		err =write_packet(udev, request, (u8 *)registers, start, count);
		if (err < 0) {
			LOG("Control message failed, err val = %d\n", err);
			LOG("Message: request = 0x%0X, start = 0x%0X\n",
			    request, start);
			LOG("Message: count = %d, register[0] = 0x%0X\n",
			    count, ((unsigned char *) registers)[0]);
		} else
			err=0;
	} else {
		LOG("Unexpected first byte of direction: %d\n",
		       direction);
		return -EINVAL;
	}

	if(err != 0)
		LOG("Unexpected error: %d\n", err);
	return err;
}


/******************************************************************************
 *
 *  submit_urbs
 *
 *****************************************************************************/
static int submit_urbs(struct camera_data *cam)
{
	struct urb *urb;
	int fx, err, i, j;

	for(i=0; i<NUM_SBUF; ++i) {
		if (cam->sbuf[i].data)
			continue;
		cam->sbuf[i].data =
		    kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
		if (!cam->sbuf[i].data) {
			while (--i >= 0) {
				kfree(cam->sbuf[i].data);
				cam->sbuf[i].data = NULL;
			}
			return -ENOMEM;
		}
	}

	/* We double buffer the Isoc lists, and also know the polling
	 * interval is every frame (1 == (1 << (bInterval -1))).
	 */
	for(i=0; i<NUM_SBUF; ++i) {
		if(cam->sbuf[i].urb) {
			continue;
		}
		urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
		if (!urb) {
			ERR("%s: usb_alloc_urb error!\n", __func__);
			for (j = 0; j < i; j++)
				usb_free_urb(cam->sbuf[j].urb);
			return -ENOMEM;
		}

		cam->sbuf[i].urb = urb;
		urb->dev = cam->dev;
		urb->context = cam;
		urb->pipe = usb_rcvisocpipe(cam->dev, 1 /*ISOC endpoint*/);
		urb->transfer_flags = URB_ISO_ASAP;
		urb->transfer_buffer = cam->sbuf[i].data;
		urb->complete = cpia2_usb_complete;
		urb->number_of_packets = FRAMES_PER_DESC;
		urb->interval = 1;
		urb->transfer_buffer_length =
			FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;

		for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
			urb->iso_frame_desc[fx].offset =
				FRAME_SIZE_PER_DESC * fx;
			urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
		}
	}


	/* Queue the ISO urbs, and resubmit in the completion handler */
	for(i=0; i<NUM_SBUF; ++i) {
		err = usb_submit_urb(cam->sbuf[i].urb, GFP_KERNEL);
		if (err) {
			ERR("usb_submit_urb[%d]() = %d\n", i, err);
			return err;
		}
	}

	return 0;
}

/******************************************************************************
 *
 *  cpia2_usb_stream_start
 *
 *****************************************************************************/
int cpia2_usb_stream_start(struct camera_data *cam, unsigned int alternate)
{
	int ret;
	int old_alt;

	if(cam->streaming)
		return 0;

	if (cam->flush) {
		int i;
		DBG("Flushing buffers\n");
		for(i=0; i<cam->num_frames; ++i) {
			cam->buffers[i].status = FRAME_EMPTY;
			cam->buffers[i].length = 0;
		}
		cam->curbuff = &cam->buffers[0];
		cam->workbuff = cam->curbuff->next;
		cam->flush = false;
	}

	old_alt = cam->params.camera_state.stream_mode;
	cam->params.camera_state.stream_mode = 0;
	ret = cpia2_usb_change_streaming_alternate(cam, alternate);
	if (ret < 0) {
		int ret2;
		ERR("cpia2_usb_change_streaming_alternate() = %d!\n", ret);
		cam->params.camera_state.stream_mode = old_alt;
		ret2 = set_alternate(cam, USBIF_CMDONLY);
		if (ret2 < 0) {
			ERR("cpia2_usb_change_streaming_alternate(%d) =%d has already "
			    "failed. Then tried to call "
			    "set_alternate(USBIF_CMDONLY) = %d.\n",
			    alternate, ret, ret2);
		}
	} else {
		cam->frame_count = 0;
		cam->streaming = 1;
		ret = cpia2_usb_stream_resume(cam);
	}
	return ret;
}

/******************************************************************************
 *
 *  cpia2_usb_stream_pause
 *
 *****************************************************************************/
int cpia2_usb_stream_pause(struct camera_data *cam)
{
	int ret = 0;
	if(cam->streaming) {
		ret = set_alternate(cam, USBIF_CMDONLY);
		free_sbufs(cam);
	}
	return ret;
}

/******************************************************************************
 *
 *  cpia2_usb_stream_resume
 *
 *****************************************************************************/
int cpia2_usb_stream_resume(struct camera_data *cam)
{
	int ret = 0;
	if(cam->streaming) {
		cam->first_image_seen = 0;
		ret = set_alternate(cam, cam->params.camera_state.stream_mode);
		if(ret == 0) {
			ret = submit_urbs(cam);
		}
	}
	return ret;
}

/******************************************************************************
 *
 *  cpia2_usb_stream_stop
 *
 *****************************************************************************/
int cpia2_usb_stream_stop(struct camera_data *cam)
{
	int ret;
	ret = cpia2_usb_stream_pause(cam);
	cam->streaming = 0;
	configure_transfer_mode(cam, 0);
	return ret;
}

/******************************************************************************
 *
 *  cpia2_usb_probe
 *
 *  Probe and initialize.
 *****************************************************************************/
static int cpia2_usb_probe(struct usb_interface *intf,
			   const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_interface_descriptor *interface;
	struct camera_data *cam;
	int ret;

	/* A multi-config CPiA2 camera? */
	if (udev->descriptor.bNumConfigurations != 1)
		return -ENODEV;
	interface = &intf->cur_altsetting->desc;

	/* If we get to this point, we found a CPiA2 camera */
	LOG("CPiA2 USB camera found\n");

	if((cam = cpia2_init_camera_struct()) == NULL)
		return -ENOMEM;

	cam->dev = udev;
	cam->iface = interface->bInterfaceNumber;

	ret = set_alternate(cam, USBIF_CMDONLY);
	if (ret < 0) {
		ERR("%s: usb_set_interface error (ret = %d)\n", __func__, ret);
		kfree(cam);
		return ret;
	}

	if ((ret = cpia2_register_camera(cam)) < 0) {
		ERR("%s: Failed to register cpia2 camera (ret = %d)\n", __func__, ret);
		kfree(cam);
		return ret;
	}


	if((ret = cpia2_init_camera(cam)) < 0) {
		ERR("%s: failed to initialize cpia2 camera (ret = %d)\n", __func__, ret);
		cpia2_unregister_camera(cam);
		kfree(cam);
		return ret;
	}
	LOG("  CPiA Version: %d.%02d (%d.%d)\n",
	       cam->params.version.firmware_revision_hi,
	       cam->params.version.firmware_revision_lo,
	       cam->params.version.asic_id,
	       cam->params.version.asic_rev);
	LOG("  CPiA PnP-ID: %04x:%04x:%04x\n",
	       cam->params.pnp_id.vendor,
	       cam->params.pnp_id.product,
	       cam->params.pnp_id.device_revision);
	LOG("  SensorID: %d.(version %d)\n",
	       cam->params.version.sensor_flags,
	       cam->params.version.sensor_rev);

	usb_set_intfdata(intf, cam);

	return 0;
}

/******************************************************************************
 *
 *  cpia2_disconnect
 *
 *****************************************************************************/
static void cpia2_usb_disconnect(struct usb_interface *intf)
{
	struct camera_data *cam = usb_get_intfdata(intf);
	usb_set_intfdata(intf, NULL);
	cam->present = 0;

	DBG("Stopping stream\n");
	cpia2_usb_stream_stop(cam);

	DBG("Unregistering camera\n");
	cpia2_unregister_camera(cam);

	if(cam->buffers) {
		DBG("Wakeup waiting processes\n");
		cam->curbuff->status = FRAME_READY;
		cam->curbuff->length = 0;
		if (waitqueue_active(&cam->wq_stream))
			wake_up_interruptible(&cam->wq_stream);
	}

	DBG("Releasing interface\n");
	usb_driver_release_interface(&cpia2_driver, intf);

	if (cam->open_count == 0) {
		DBG("Freeing camera structure\n");
		kfree(cam);
	}

	LOG("CPiA2 camera disconnected.\n");
}


/******************************************************************************
 *
 *  usb_cpia2_init
 *
 *****************************************************************************/
int cpia2_usb_init(void)
{
	return usb_register(&cpia2_driver);
}

/******************************************************************************
 *
 *  usb_cpia_cleanup
 *
 *****************************************************************************/
void cpia2_usb_cleanup(void)
{
	schedule_timeout(2 * HZ);
	usb_deregister(&cpia2_driver);
}
OpenPOWER on IntegriCloud