aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/hackrf/hackrf.c
blob: e05bfec90f4608b0d8ebce199351dfe89db11994 (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
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
/*
 * HackRF driver
 *
 * Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
 *
 *    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.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-vmalloc.h>

/* HackRF USB API commands (from HackRF Library) */
enum {
	CMD_SET_TRANSCEIVER_MODE           = 0x01,
	CMD_SAMPLE_RATE_SET                = 0x06,
	CMD_BASEBAND_FILTER_BANDWIDTH_SET  = 0x07,
	CMD_BOARD_ID_READ                  = 0x0e,
	CMD_VERSION_STRING_READ            = 0x0f,
	CMD_SET_FREQ                       = 0x10,
	CMD_AMP_ENABLE                     = 0x11,
	CMD_SET_LNA_GAIN                   = 0x13,
	CMD_SET_VGA_GAIN                   = 0x14,
	CMD_SET_TXVGA_GAIN                 = 0x15,
};

/*
 *       bEndpointAddress     0x81  EP 1 IN
 *         Transfer Type            Bulk
 *       wMaxPacketSize     0x0200  1x 512 bytes
 */
#define MAX_BULK_BUFS            (6)
#define BULK_BUFFER_SIZE         (128 * 512)

static const struct v4l2_frequency_band bands_adc_dac[] = {
	{
		.tuner = 0,
		.type = V4L2_TUNER_SDR,
		.index = 0,
		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =   200000,
		.rangehigh  = 24000000,
	},
};

static const struct v4l2_frequency_band bands_rx_tx[] = {
	{
		.tuner = 1,
		.type = V4L2_TUNER_RF,
		.index = 0,
		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =          1,
		.rangehigh  = 4294967294LL, /* max u32, hw goes over 7GHz */
	},
};

/* stream formats */
struct hackrf_format {
	u32	pixelformat;
	u32	buffersize;
};

/* format descriptions for capture and preview */
static struct hackrf_format formats[] = {
	{
		.pixelformat	= V4L2_SDR_FMT_CS8,
		.buffersize	= BULK_BUFFER_SIZE,
	},
};

static const unsigned int NUM_FORMATS = ARRAY_SIZE(formats);

/* intermediate buffers with raw data from the USB device */
struct hackrf_buffer {
	struct vb2_v4l2_buffer vb;
	struct list_head list;
};

struct hackrf_dev {
#define USB_STATE_URB_BUF                1 /* XXX: set manually */
#define RX_ON                            4
#define TX_ON                            5
#define RX_ADC_FREQUENCY                11
#define TX_DAC_FREQUENCY                12
#define RX_BANDWIDTH                    13
#define TX_BANDWIDTH                    14
#define RX_RF_FREQUENCY                 15
#define TX_RF_FREQUENCY                 16
#define RX_RF_GAIN                      17
#define TX_RF_GAIN                      18
#define RX_IF_GAIN                      19
#define RX_LNA_GAIN                     20
#define TX_LNA_GAIN                     21
	unsigned long flags;

	struct usb_interface *intf;
	struct device *dev;
	struct usb_device *udev;
	struct video_device rx_vdev;
	struct video_device tx_vdev;
	struct v4l2_device v4l2_dev;

	/* videobuf2 queue and queued buffers list */
	struct vb2_queue rx_vb2_queue;
	struct vb2_queue tx_vb2_queue;
	struct list_head rx_buffer_list;
	struct list_head tx_buffer_list;
	spinlock_t buffer_list_lock; /* Protects buffer_list */
	unsigned sequence;	     /* Buffer sequence counter */
	unsigned int vb_full;        /* vb is full and packets dropped */
	unsigned int vb_empty;       /* vb is empty and packets dropped */

	/* Note if taking both locks v4l2_lock must always be locked first! */
	struct mutex v4l2_lock;      /* Protects everything else */
	struct mutex vb_queue_lock;  /* Protects vb_queue */

	struct urb     *urb_list[MAX_BULK_BUFS];
	int            buf_num;
	unsigned long  buf_size;
	u8             *buf_list[MAX_BULK_BUFS];
	dma_addr_t     dma_addr[MAX_BULK_BUFS];
	int            urbs_initialized;
	int            urbs_submitted;

	/* USB control message buffer */
	#define BUF_SIZE 24
	u8 buf[BUF_SIZE];

	/* Current configuration */
	unsigned int f_adc;
	unsigned int f_dac;
	unsigned int f_rx;
	unsigned int f_tx;
	u32 pixelformat;
	u32 buffersize;

	/* Controls */
	struct v4l2_ctrl_handler rx_ctrl_handler;
	struct v4l2_ctrl *rx_bandwidth_auto;
	struct v4l2_ctrl *rx_bandwidth;
	struct v4l2_ctrl *rx_rf_gain;
	struct v4l2_ctrl *rx_lna_gain;
	struct v4l2_ctrl *rx_if_gain;
	struct v4l2_ctrl_handler tx_ctrl_handler;
	struct v4l2_ctrl *tx_bandwidth_auto;
	struct v4l2_ctrl *tx_bandwidth;
	struct v4l2_ctrl *tx_rf_gain;
	struct v4l2_ctrl *tx_lna_gain;

	/* Sample rate calc */
	unsigned long jiffies_next;
	unsigned int sample;
	unsigned int sample_measured;
};

#define hackrf_dbg_usb_control_msg(_dev, _r, _t, _v, _i, _b, _l) { \
	char *_direction; \
	if (_t & USB_DIR_IN) \
		_direction = "<<<"; \
	else \
		_direction = ">>>"; \
	dev_dbg(_dev, "%02x %02x %02x %02x %02x %02x %02x %02x %s %*ph\n", \
			_t, _r, _v & 0xff, _v >> 8, _i & 0xff, \
			_i >> 8, _l & 0xff, _l >> 8, _direction, _l, _b); \
}

/* execute firmware command */
static int hackrf_ctrl_msg(struct hackrf_dev *dev, u8 request, u16 value,
		u16 index, u8 *data, u16 size)
{
	int ret;
	unsigned int pipe;
	u8 requesttype;

	switch (request) {
	case CMD_SET_TRANSCEIVER_MODE:
	case CMD_SET_FREQ:
	case CMD_AMP_ENABLE:
	case CMD_SAMPLE_RATE_SET:
	case CMD_BASEBAND_FILTER_BANDWIDTH_SET:
		pipe = usb_sndctrlpipe(dev->udev, 0);
		requesttype = (USB_TYPE_VENDOR | USB_DIR_OUT);
		break;
	case CMD_BOARD_ID_READ:
	case CMD_VERSION_STRING_READ:
	case CMD_SET_LNA_GAIN:
	case CMD_SET_VGA_GAIN:
	case CMD_SET_TXVGA_GAIN:
		pipe = usb_rcvctrlpipe(dev->udev, 0);
		requesttype = (USB_TYPE_VENDOR | USB_DIR_IN);
		break;
	default:
		dev_err(dev->dev, "Unknown command %02x\n", request);
		ret = -EINVAL;
		goto err;
	}

	/* write request */
	if (!(requesttype & USB_DIR_IN))
		memcpy(dev->buf, data, size);

	ret = usb_control_msg(dev->udev, pipe, request, requesttype, value,
			index, dev->buf, size, 1000);
	hackrf_dbg_usb_control_msg(dev->dev, request, requesttype, value,
			index, dev->buf, size);
	if (ret < 0) {
		dev_err(dev->dev, "usb_control_msg() failed %d request %02x\n",
				ret, request);
		goto err;
	}

	/* read request */
	if (requesttype & USB_DIR_IN)
		memcpy(data, dev->buf, size);

	return 0;
err:
	return ret;
}

static int hackrf_set_params(struct hackrf_dev *dev)
{
	struct usb_interface *intf = dev->intf;
	int ret, i;
	u8 buf[8], u8tmp;
	unsigned int uitmp, uitmp1, uitmp2;
	const bool rx = test_bit(RX_ON, &dev->flags);
	const bool tx = test_bit(TX_ON, &dev->flags);
	static const struct {
		u32 freq;
	} bandwidth_lut[] = {
		{ 1750000}, /*  1.75 MHz */
		{ 2500000}, /*  2.5  MHz */
		{ 3500000}, /*  3.5  MHz */
		{ 5000000}, /*  5    MHz */
		{ 5500000}, /*  5.5  MHz */
		{ 6000000}, /*  6    MHz */
		{ 7000000}, /*  7    MHz */
		{ 8000000}, /*  8    MHz */
		{ 9000000}, /*  9    MHz */
		{10000000}, /* 10    MHz */
		{12000000}, /* 12    MHz */
		{14000000}, /* 14    MHz */
		{15000000}, /* 15    MHz */
		{20000000}, /* 20    MHz */
		{24000000}, /* 24    MHz */
		{28000000}, /* 28    MHz */
	};

	if (!rx && !tx) {
		dev_dbg(&intf->dev, "device is sleeping\n");
		return 0;
	}

	/* ADC / DAC frequency */
	if (rx && test_and_clear_bit(RX_ADC_FREQUENCY, &dev->flags)) {
		dev_dbg(&intf->dev, "RX ADC frequency=%u Hz\n", dev->f_adc);
		uitmp1 = dev->f_adc;
		uitmp2 = 1;
		set_bit(TX_DAC_FREQUENCY, &dev->flags);
	} else if (tx && test_and_clear_bit(TX_DAC_FREQUENCY, &dev->flags)) {
		dev_dbg(&intf->dev, "TX DAC frequency=%u Hz\n", dev->f_dac);
		uitmp1 = dev->f_dac;
		uitmp2 = 1;
		set_bit(RX_ADC_FREQUENCY, &dev->flags);
	} else {
		uitmp1 = uitmp2 = 0;
	}
	if (uitmp1 || uitmp2) {
		buf[0] = (uitmp1 >>  0) & 0xff;
		buf[1] = (uitmp1 >>  8) & 0xff;
		buf[2] = (uitmp1 >> 16) & 0xff;
		buf[3] = (uitmp1 >> 24) & 0xff;
		buf[4] = (uitmp2 >>  0) & 0xff;
		buf[5] = (uitmp2 >>  8) & 0xff;
		buf[6] = (uitmp2 >> 16) & 0xff;
		buf[7] = (uitmp2 >> 24) & 0xff;
		ret = hackrf_ctrl_msg(dev, CMD_SAMPLE_RATE_SET, 0, 0, buf, 8);
		if (ret)
			goto err;
	}

	/* bandwidth */
	if (rx && test_and_clear_bit(RX_BANDWIDTH, &dev->flags)) {
		if (dev->rx_bandwidth_auto->val == true)
			uitmp = dev->f_adc;
		else
			uitmp = dev->rx_bandwidth->val;

		for (i = 0; i < ARRAY_SIZE(bandwidth_lut); i++) {
			if (uitmp <= bandwidth_lut[i].freq) {
				uitmp = bandwidth_lut[i].freq;
				break;
			}
		}
		dev->rx_bandwidth->val = uitmp;
		dev->rx_bandwidth->cur.val = uitmp;
		dev_dbg(&intf->dev, "RX bandwidth selected=%u\n", uitmp);
		set_bit(TX_BANDWIDTH, &dev->flags);
	} else if (tx && test_and_clear_bit(TX_BANDWIDTH, &dev->flags)) {
		if (dev->tx_bandwidth_auto->val == true)
			uitmp = dev->f_dac;
		else
			uitmp = dev->tx_bandwidth->val;

		for (i = 0; i < ARRAY_SIZE(bandwidth_lut); i++) {
			if (uitmp <= bandwidth_lut[i].freq) {
				uitmp = bandwidth_lut[i].freq;
				break;
			}
		}
		dev->tx_bandwidth->val = uitmp;
		dev->tx_bandwidth->cur.val = uitmp;
		dev_dbg(&intf->dev, "TX bandwidth selected=%u\n", uitmp);
		set_bit(RX_BANDWIDTH, &dev->flags);
	} else {
		uitmp = 0;
	}
	if (uitmp) {
		uitmp1 = uitmp2 = 0;
		uitmp1 |= ((uitmp >>  0) & 0xff) << 0;
		uitmp1 |= ((uitmp >>  8) & 0xff) << 8;
		uitmp2 |= ((uitmp >> 16) & 0xff) << 0;
		uitmp2 |= ((uitmp >> 24) & 0xff) << 8;
		ret = hackrf_ctrl_msg(dev, CMD_BASEBAND_FILTER_BANDWIDTH_SET,
				      uitmp1, uitmp2, NULL, 0);
		if (ret)
			goto err;
	}

	/* RX / TX RF frequency */
	if (rx && test_and_clear_bit(RX_RF_FREQUENCY, &dev->flags)) {
		dev_dbg(&intf->dev, "RX RF frequency=%u Hz\n", dev->f_rx);
		uitmp1 = dev->f_rx / 1000000;
		uitmp2 = dev->f_rx % 1000000;
		set_bit(TX_RF_FREQUENCY, &dev->flags);
	} else if (tx && test_and_clear_bit(TX_RF_FREQUENCY, &dev->flags)) {
		dev_dbg(&intf->dev, "TX RF frequency=%u Hz\n", dev->f_tx);
		uitmp1 = dev->f_tx / 1000000;
		uitmp2 = dev->f_tx % 1000000;
		set_bit(RX_RF_FREQUENCY, &dev->flags);
	} else {
		uitmp1 = uitmp2 = 0;
	}
	if (uitmp1 || uitmp2) {
		buf[0] = (uitmp1 >>  0) & 0xff;
		buf[1] = (uitmp1 >>  8) & 0xff;
		buf[2] = (uitmp1 >> 16) & 0xff;
		buf[3] = (uitmp1 >> 24) & 0xff;
		buf[4] = (uitmp2 >>  0) & 0xff;
		buf[5] = (uitmp2 >>  8) & 0xff;
		buf[6] = (uitmp2 >> 16) & 0xff;
		buf[7] = (uitmp2 >> 24) & 0xff;
		ret = hackrf_ctrl_msg(dev, CMD_SET_FREQ, 0, 0, buf, 8);
		if (ret)
			goto err;
	}

	/* RX RF gain */
	if (rx && test_and_clear_bit(RX_RF_GAIN, &dev->flags)) {
		dev_dbg(&intf->dev, "RX RF gain val=%d->%d\n",
			dev->rx_rf_gain->cur.val, dev->rx_rf_gain->val);

		u8tmp = (dev->rx_rf_gain->val) ? 1 : 0;
		ret = hackrf_ctrl_msg(dev, CMD_AMP_ENABLE, u8tmp, 0, NULL, 0);
		if (ret)
			goto err;
		set_bit(TX_RF_GAIN, &dev->flags);
	}

	/* TX RF gain */
	if (tx && test_and_clear_bit(TX_RF_GAIN, &dev->flags)) {
		dev_dbg(&intf->dev, "TX RF gain val=%d->%d\n",
			dev->tx_rf_gain->cur.val, dev->tx_rf_gain->val);

		u8tmp = (dev->tx_rf_gain->val) ? 1 : 0;
		ret = hackrf_ctrl_msg(dev, CMD_AMP_ENABLE, u8tmp, 0, NULL, 0);
		if (ret)
			goto err;
		set_bit(RX_RF_GAIN, &dev->flags);
	}

	/* RX LNA gain */
	if (rx && test_and_clear_bit(RX_LNA_GAIN, &dev->flags)) {
		dev_dbg(dev->dev, "RX LNA gain val=%d->%d\n",
			dev->rx_lna_gain->cur.val, dev->rx_lna_gain->val);

		ret = hackrf_ctrl_msg(dev, CMD_SET_LNA_GAIN, 0,
				      dev->rx_lna_gain->val, &u8tmp, 1);
		if (ret)
			goto err;
	}

	/* RX IF gain */
	if (rx && test_and_clear_bit(RX_IF_GAIN, &dev->flags)) {
		dev_dbg(&intf->dev, "IF gain val=%d->%d\n",
			dev->rx_if_gain->cur.val, dev->rx_if_gain->val);

		ret = hackrf_ctrl_msg(dev, CMD_SET_VGA_GAIN, 0,
				      dev->rx_if_gain->val, &u8tmp, 1);
		if (ret)
			goto err;
	}

	/* TX LNA gain */
	if (tx && test_and_clear_bit(TX_LNA_GAIN, &dev->flags)) {
		dev_dbg(&intf->dev, "TX LNA gain val=%d->%d\n",
			dev->tx_lna_gain->cur.val, dev->tx_lna_gain->val);

		ret = hackrf_ctrl_msg(dev, CMD_SET_TXVGA_GAIN, 0,
				      dev->tx_lna_gain->val, &u8tmp, 1);
		if (ret)
			goto err;
	}

	return 0;
err:
	dev_dbg(&intf->dev, "failed=%d\n", ret);
	return ret;
}

/* Private functions */
static struct hackrf_buffer *hackrf_get_next_buffer(struct hackrf_dev *dev,
						    struct list_head *buffer_list)
{
	unsigned long flags;
	struct hackrf_buffer *buffer = NULL;

	spin_lock_irqsave(&dev->buffer_list_lock, flags);
	if (list_empty(buffer_list))
		goto leave;

	buffer = list_entry(buffer_list->next, struct hackrf_buffer, list);
	list_del(&buffer->list);
leave:
	spin_unlock_irqrestore(&dev->buffer_list_lock, flags);
	return buffer;
}

static void hackrf_copy_stream(struct hackrf_dev *dev, void *dst, void *src,
			       unsigned int src_len)
{
	memcpy(dst, src, src_len);

	/* calculate sample rate and output it in 10 seconds intervals */
	if (unlikely(time_is_before_jiffies(dev->jiffies_next))) {
		#define MSECS 10000UL
		unsigned int msecs = jiffies_to_msecs(jiffies -
				dev->jiffies_next + msecs_to_jiffies(MSECS));
		unsigned int samples = dev->sample - dev->sample_measured;

		dev->jiffies_next = jiffies + msecs_to_jiffies(MSECS);
		dev->sample_measured = dev->sample;
		dev_dbg(dev->dev, "slen=%u samples=%u msecs=%u sample rate=%lu\n",
				src_len, samples, msecs,
				samples * 1000UL / msecs);
	}

	/* total number of samples */
	dev->sample += src_len / 2;
}

/*
 * This gets called for the bulk stream pipe. This is done in interrupt
 * time, so it has to be fast, not crash, and not stall. Neat.
 */
static void hackrf_urb_complete_in(struct urb *urb)
{
	struct hackrf_dev *dev = urb->context;
	struct usb_interface *intf = dev->intf;
	struct hackrf_buffer *buffer;
	unsigned int len;

	dev_dbg_ratelimited(&intf->dev, "status=%d length=%u/%u\n", urb->status,
			    urb->actual_length, urb->transfer_buffer_length);

	switch (urb->status) {
	case 0:             /* success */
	case -ETIMEDOUT:    /* NAK */
		break;
	case -ECONNRESET:   /* kill */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:            /* error */
		dev_err_ratelimited(&intf->dev, "URB failed %d\n", urb->status);
		goto exit_usb_submit_urb;
	}

	/* get buffer to write */
	buffer = hackrf_get_next_buffer(dev, &dev->rx_buffer_list);
	if (unlikely(buffer == NULL)) {
		dev->vb_full++;
		dev_notice_ratelimited(&intf->dev,
				       "buffer is full - %u packets dropped\n",
				       dev->vb_full);
		goto exit_usb_submit_urb;
	}

	len = min_t(unsigned long, vb2_plane_size(&buffer->vb.vb2_buf, 0),
		    urb->actual_length);
	hackrf_copy_stream(dev, vb2_plane_vaddr(&buffer->vb.vb2_buf, 0),
		    urb->transfer_buffer, len);
	vb2_set_plane_payload(&buffer->vb.vb2_buf, 0, len);
	buffer->vb.sequence = dev->sequence++;
	v4l2_get_timestamp(&buffer->vb.timestamp);
	vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_DONE);
exit_usb_submit_urb:
	usb_submit_urb(urb, GFP_ATOMIC);
}

static void hackrf_urb_complete_out(struct urb *urb)
{
	struct hackrf_dev *dev = urb->context;
	struct usb_interface *intf = dev->intf;
	struct hackrf_buffer *buffer;
	unsigned int len;

	dev_dbg_ratelimited(&intf->dev, "status=%d length=%u/%u\n", urb->status,
			    urb->actual_length, urb->transfer_buffer_length);

	switch (urb->status) {
	case 0:             /* success */
	case -ETIMEDOUT:    /* NAK */
		break;
	case -ECONNRESET:   /* kill */
	case -ENOENT:
	case -ESHUTDOWN:
		return;
	default:            /* error */
		dev_err_ratelimited(&intf->dev, "URB failed %d\n", urb->status);
	}

	/* get buffer to read */
	buffer = hackrf_get_next_buffer(dev, &dev->tx_buffer_list);
	if (unlikely(buffer == NULL)) {
		dev->vb_empty++;
		dev_notice_ratelimited(&intf->dev,
				       "buffer is empty - %u packets dropped\n",
				       dev->vb_empty);
		urb->actual_length = 0;
		goto exit_usb_submit_urb;
	}

	len = min_t(unsigned long, urb->transfer_buffer_length,
		    vb2_get_plane_payload(&buffer->vb.vb2_buf, 0));
	hackrf_copy_stream(dev, urb->transfer_buffer,
			   vb2_plane_vaddr(&buffer->vb.vb2_buf, 0), len);
	urb->actual_length = len;
	buffer->vb.sequence = dev->sequence++;
	v4l2_get_timestamp(&buffer->vb.timestamp);
	vb2_buffer_done(&buffer->vb.vb2_buf, VB2_BUF_STATE_DONE);
exit_usb_submit_urb:
	usb_submit_urb(urb, GFP_ATOMIC);
}

static int hackrf_kill_urbs(struct hackrf_dev *dev)
{
	int i;

	for (i = dev->urbs_submitted - 1; i >= 0; i--) {
		dev_dbg(dev->dev, "kill urb=%d\n", i);
		/* stop the URB */
		usb_kill_urb(dev->urb_list[i]);
	}
	dev->urbs_submitted = 0;

	return 0;
}

static int hackrf_submit_urbs(struct hackrf_dev *dev)
{
	int i, ret;

	for (i = 0; i < dev->urbs_initialized; i++) {
		dev_dbg(dev->dev, "submit urb=%d\n", i);
		ret = usb_submit_urb(dev->urb_list[i], GFP_ATOMIC);
		if (ret) {
			dev_err(dev->dev, "Could not submit URB no. %d - get them all back\n",
					i);
			hackrf_kill_urbs(dev);
			return ret;
		}
		dev->urbs_submitted++;
	}

	return 0;
}

static int hackrf_free_stream_bufs(struct hackrf_dev *dev)
{
	if (dev->flags & USB_STATE_URB_BUF) {
		while (dev->buf_num) {
			dev->buf_num--;
			dev_dbg(dev->dev, "free buf=%d\n", dev->buf_num);
			usb_free_coherent(dev->udev, dev->buf_size,
					  dev->buf_list[dev->buf_num],
					  dev->dma_addr[dev->buf_num]);
		}
	}
	dev->flags &= ~USB_STATE_URB_BUF;

	return 0;
}

static int hackrf_alloc_stream_bufs(struct hackrf_dev *dev)
{
	dev->buf_num = 0;
	dev->buf_size = BULK_BUFFER_SIZE;

	dev_dbg(dev->dev, "all in all I will use %u bytes for streaming\n",
			MAX_BULK_BUFS * BULK_BUFFER_SIZE);

	for (dev->buf_num = 0; dev->buf_num < MAX_BULK_BUFS; dev->buf_num++) {
		dev->buf_list[dev->buf_num] = usb_alloc_coherent(dev->udev,
				BULK_BUFFER_SIZE, GFP_ATOMIC,
				&dev->dma_addr[dev->buf_num]);
		if (!dev->buf_list[dev->buf_num]) {
			dev_dbg(dev->dev, "alloc buf=%d failed\n",
					dev->buf_num);
			hackrf_free_stream_bufs(dev);
			return -ENOMEM;
		}

		dev_dbg(dev->dev, "alloc buf=%d %p (dma %llu)\n", dev->buf_num,
				dev->buf_list[dev->buf_num],
				(long long)dev->dma_addr[dev->buf_num]);
		dev->flags |= USB_STATE_URB_BUF;
	}

	return 0;
}

static int hackrf_free_urbs(struct hackrf_dev *dev)
{
	int i;

	hackrf_kill_urbs(dev);

	for (i = dev->urbs_initialized - 1; i >= 0; i--) {
		if (dev->urb_list[i]) {
			dev_dbg(dev->dev, "free urb=%d\n", i);
			/* free the URBs */
			usb_free_urb(dev->urb_list[i]);
		}
	}
	dev->urbs_initialized = 0;

	return 0;
}

static int hackrf_alloc_urbs(struct hackrf_dev *dev, bool rcv)
{
	int i, j;
	unsigned int pipe;
	usb_complete_t complete;

	if (rcv) {
		pipe = usb_rcvbulkpipe(dev->udev, 0x81);
		complete = &hackrf_urb_complete_in;
	} else {
		pipe = usb_sndbulkpipe(dev->udev, 0x02);
		complete = &hackrf_urb_complete_out;
	}

	/* allocate the URBs */
	for (i = 0; i < MAX_BULK_BUFS; i++) {
		dev_dbg(dev->dev, "alloc urb=%d\n", i);
		dev->urb_list[i] = usb_alloc_urb(0, GFP_ATOMIC);
		if (!dev->urb_list[i]) {
			dev_dbg(dev->dev, "failed\n");
			for (j = 0; j < i; j++)
				usb_free_urb(dev->urb_list[j]);
			return -ENOMEM;
		}
		usb_fill_bulk_urb(dev->urb_list[i],
				dev->udev,
				pipe,
				dev->buf_list[i],
				BULK_BUFFER_SIZE,
				complete, dev);

		dev->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
		dev->urb_list[i]->transfer_dma = dev->dma_addr[i];
		dev->urbs_initialized++;
	}

	return 0;
}

/* The user yanked out the cable... */
static void hackrf_disconnect(struct usb_interface *intf)
{
	struct v4l2_device *v = usb_get_intfdata(intf);
	struct hackrf_dev *dev = container_of(v, struct hackrf_dev, v4l2_dev);

	dev_dbg(dev->dev, "\n");

	mutex_lock(&dev->vb_queue_lock);
	mutex_lock(&dev->v4l2_lock);
	/* No need to keep the urbs around after disconnection */
	dev->udev = NULL;
	v4l2_device_disconnect(&dev->v4l2_dev);
	video_unregister_device(&dev->tx_vdev);
	video_unregister_device(&dev->rx_vdev);
	mutex_unlock(&dev->v4l2_lock);
	mutex_unlock(&dev->vb_queue_lock);

	v4l2_device_put(&dev->v4l2_dev);
}

/* Videobuf2 operations */
static void hackrf_return_all_buffers(struct vb2_queue *vq,
				      enum vb2_buffer_state state)
{
	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
	struct usb_interface *intf = dev->intf;
	struct hackrf_buffer *buffer, *node;
	struct list_head *buffer_list;
	unsigned long flags;

	dev_dbg(&intf->dev, "\n");

	if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE)
		buffer_list = &dev->rx_buffer_list;
	else
		buffer_list = &dev->tx_buffer_list;

	spin_lock_irqsave(&dev->buffer_list_lock, flags);
	list_for_each_entry_safe(buffer, node, buffer_list, list) {
		dev_dbg(&intf->dev, "list_for_each_entry_safe\n");
		vb2_buffer_done(&buffer->vb.vb2_buf, state);
		list_del(&buffer->list);
	}
	spin_unlock_irqrestore(&dev->buffer_list_lock, flags);
}

static int hackrf_queue_setup(struct vb2_queue *vq,
		const void *parg, unsigned int *nbuffers,
		unsigned int *nplanes, unsigned int sizes[], void *alloc_ctxs[])
{
	struct hackrf_dev *dev = vb2_get_drv_priv(vq);

	dev_dbg(dev->dev, "nbuffers=%d\n", *nbuffers);

	/* Need at least 8 buffers */
	if (vq->num_buffers + *nbuffers < 8)
		*nbuffers = 8 - vq->num_buffers;
	*nplanes = 1;
	sizes[0] = PAGE_ALIGN(dev->buffersize);

	dev_dbg(dev->dev, "nbuffers=%d sizes[0]=%d\n", *nbuffers, sizes[0]);
	return 0;
}

static void hackrf_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vb2_queue *vq = vb->vb2_queue;
	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
	struct hackrf_buffer *buffer = container_of(vbuf, struct hackrf_buffer, vb);
	struct list_head *buffer_list;
	unsigned long flags;

	dev_dbg_ratelimited(&dev->intf->dev, "\n");

	if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE)
		buffer_list = &dev->rx_buffer_list;
	else
		buffer_list = &dev->tx_buffer_list;

	spin_lock_irqsave(&dev->buffer_list_lock, flags);
	list_add_tail(&buffer->list, buffer_list);
	spin_unlock_irqrestore(&dev->buffer_list_lock, flags);
}

static int hackrf_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
	struct usb_interface *intf = dev->intf;
	int ret;
	unsigned int mode;

	dev_dbg(&intf->dev, "count=%i\n", count);

	mutex_lock(&dev->v4l2_lock);

	/* Allow only RX or TX, not both same time */
	if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE) {
		if (test_bit(TX_ON, &dev->flags)) {
			ret = -EBUSY;
			goto err_hackrf_return_all_buffers;
		}

		mode = 1;
		set_bit(RX_ON, &dev->flags);
	} else {
		if (test_bit(RX_ON, &dev->flags)) {
			ret = -EBUSY;
			goto err_hackrf_return_all_buffers;
		}

		mode = 2;
		set_bit(TX_ON, &dev->flags);
	}

	dev->sequence = 0;

	ret = hackrf_alloc_stream_bufs(dev);
	if (ret)
		goto err;

	ret = hackrf_alloc_urbs(dev, (mode == 1));
	if (ret)
		goto err;

	ret = hackrf_submit_urbs(dev);
	if (ret)
		goto err;

	ret = hackrf_set_params(dev);
	if (ret)
		goto err;

	/* start hardware streaming */
	ret = hackrf_ctrl_msg(dev, CMD_SET_TRANSCEIVER_MODE, mode, 0, NULL, 0);
	if (ret)
		goto err;

	mutex_unlock(&dev->v4l2_lock);

	return 0;
err:
	hackrf_kill_urbs(dev);
	hackrf_free_urbs(dev);
	hackrf_free_stream_bufs(dev);
	clear_bit(RX_ON, &dev->flags);
	clear_bit(TX_ON, &dev->flags);
err_hackrf_return_all_buffers:
	hackrf_return_all_buffers(vq, VB2_BUF_STATE_QUEUED);
	mutex_unlock(&dev->v4l2_lock);
	dev_dbg(&intf->dev, "failed=%d\n", ret);
	return ret;
}

static void hackrf_stop_streaming(struct vb2_queue *vq)
{
	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
	struct usb_interface *intf = dev->intf;

	dev_dbg(&intf->dev, "\n");

	mutex_lock(&dev->v4l2_lock);

	/* stop hardware streaming */
	hackrf_ctrl_msg(dev, CMD_SET_TRANSCEIVER_MODE, 0, 0, NULL, 0);

	hackrf_kill_urbs(dev);
	hackrf_free_urbs(dev);
	hackrf_free_stream_bufs(dev);

	hackrf_return_all_buffers(vq, VB2_BUF_STATE_ERROR);

	if (vq->type == V4L2_BUF_TYPE_SDR_CAPTURE)
		clear_bit(RX_ON, &dev->flags);
	else
		clear_bit(TX_ON, &dev->flags);

	mutex_unlock(&dev->v4l2_lock);
}

static struct vb2_ops hackrf_vb2_ops = {
	.queue_setup            = hackrf_queue_setup,
	.buf_queue              = hackrf_buf_queue,
	.start_streaming        = hackrf_start_streaming,
	.stop_streaming         = hackrf_stop_streaming,
	.wait_prepare           = vb2_ops_wait_prepare,
	.wait_finish            = vb2_ops_wait_finish,
};

static int hackrf_querycap(struct file *file, void *fh,
		struct v4l2_capability *cap)
{
	struct hackrf_dev *dev = video_drvdata(file);
	struct usb_interface *intf = dev->intf;
	struct video_device *vdev = video_devdata(file);

	dev_dbg(&intf->dev, "\n");

	if (vdev->vfl_dir == VFL_DIR_RX)
		cap->device_caps = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
				   V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;

	else
		cap->device_caps = V4L2_CAP_SDR_OUTPUT | V4L2_CAP_MODULATOR |
				   V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;

	cap->capabilities = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
			    V4L2_CAP_SDR_OUTPUT | V4L2_CAP_MODULATOR |
			    V4L2_CAP_STREAMING | V4L2_CAP_READWRITE |
			    V4L2_CAP_DEVICE_CAPS;
	strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
	strlcpy(cap->card, dev->rx_vdev.name, sizeof(cap->card));
	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));

	return 0;
}

static int hackrf_s_fmt_sdr(struct file *file, void *priv,
			    struct v4l2_format *f)
{
	struct hackrf_dev *dev = video_drvdata(file);
	struct video_device *vdev = video_devdata(file);
	struct vb2_queue *q;
	int i;

	dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
			(char *)&f->fmt.sdr.pixelformat);

	if (vdev->vfl_dir == VFL_DIR_RX)
		q = &dev->rx_vb2_queue;
	else
		q = &dev->tx_vb2_queue;

	if (vb2_is_busy(q))
		return -EBUSY;

	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	for (i = 0; i < NUM_FORMATS; i++) {
		if (f->fmt.sdr.pixelformat == formats[i].pixelformat) {
			dev->pixelformat = formats[i].pixelformat;
			dev->buffersize = formats[i].buffersize;
			f->fmt.sdr.buffersize = formats[i].buffersize;
			return 0;
		}
	}

	dev->pixelformat = formats[0].pixelformat;
	dev->buffersize = formats[0].buffersize;
	f->fmt.sdr.pixelformat = formats[0].pixelformat;
	f->fmt.sdr.buffersize = formats[0].buffersize;

	return 0;
}

static int hackrf_g_fmt_sdr(struct file *file, void *priv,
			    struct v4l2_format *f)
{
	struct hackrf_dev *dev = video_drvdata(file);

	dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
			(char *)&dev->pixelformat);

	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	f->fmt.sdr.pixelformat = dev->pixelformat;
	f->fmt.sdr.buffersize = dev->buffersize;

	return 0;
}

static int hackrf_try_fmt_sdr(struct file *file, void *priv,
			      struct v4l2_format *f)
{
	struct hackrf_dev *dev = video_drvdata(file);
	int i;

	dev_dbg(dev->dev, "pixelformat fourcc %4.4s\n",
			(char *)&f->fmt.sdr.pixelformat);

	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	for (i = 0; i < NUM_FORMATS; i++) {
		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
			f->fmt.sdr.buffersize = formats[i].buffersize;
			return 0;
		}
	}

	f->fmt.sdr.pixelformat = formats[0].pixelformat;
	f->fmt.sdr.buffersize = formats[0].buffersize;

	return 0;
}

static int hackrf_enum_fmt_sdr(struct file *file, void *priv,
			       struct v4l2_fmtdesc *f)
{
	struct hackrf_dev *dev = video_drvdata(file);

	dev_dbg(dev->dev, "index=%d\n", f->index);

	if (f->index >= NUM_FORMATS)
		return -EINVAL;

	f->pixelformat = formats[f->index].pixelformat;

	return 0;
}

static int hackrf_s_tuner(struct file *file, void *priv,
		const struct v4l2_tuner *v)
{
	struct hackrf_dev *dev = video_drvdata(file);
	int ret;

	dev_dbg(dev->dev, "index=%d\n", v->index);

	if (v->index == 0)
		ret = 0;
	else if (v->index == 1)
		ret = 0;
	else
		ret = -EINVAL;

	return ret;
}

static int hackrf_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
{
	struct hackrf_dev *dev = video_drvdata(file);
	int ret;

	dev_dbg(dev->dev, "index=%d\n", v->index);

	if (v->index == 0) {
		strlcpy(v->name, "HackRF ADC", sizeof(v->name));
		v->type = V4L2_TUNER_SDR;
		v->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
		v->rangelow  = bands_adc_dac[0].rangelow;
		v->rangehigh = bands_adc_dac[0].rangehigh;
		ret = 0;
	} else if (v->index == 1) {
		strlcpy(v->name, "HackRF RF", sizeof(v->name));
		v->type = V4L2_TUNER_RF;
		v->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
		v->rangelow  = bands_rx_tx[0].rangelow;
		v->rangehigh = bands_rx_tx[0].rangehigh;
		ret = 0;
	} else {
		ret = -EINVAL;
	}

	return ret;
}

static int hackrf_s_modulator(struct file *file, void *fh,
			      const struct v4l2_modulator *a)
{
	struct hackrf_dev *dev = video_drvdata(file);

	dev_dbg(dev->dev, "index=%d\n", a->index);

	return a->index > 1 ? -EINVAL : 0;
}

static int hackrf_g_modulator(struct file *file, void *fh,
			      struct v4l2_modulator *a)
{
	struct hackrf_dev *dev = video_drvdata(file);
	int ret;

	dev_dbg(dev->dev, "index=%d\n", a->index);

	if (a->index == 0) {
		strlcpy(a->name, "HackRF DAC", sizeof(a->name));
		a->type = V4L2_TUNER_SDR;
		a->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
		a->rangelow  = bands_adc_dac[0].rangelow;
		a->rangehigh = bands_adc_dac[0].rangehigh;
		ret = 0;
	} else if (a->index == 1) {
		strlcpy(a->name, "HackRF RF", sizeof(a->name));
		a->type = V4L2_TUNER_RF;
		a->capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
		a->rangelow  = bands_rx_tx[0].rangelow;
		a->rangehigh = bands_rx_tx[0].rangehigh;
		ret = 0;
	} else {
		ret = -EINVAL;
	}

	return ret;
}

static int hackrf_s_frequency(struct file *file, void *priv,
		const struct v4l2_frequency *f)
{
	struct hackrf_dev *dev = video_drvdata(file);
	struct usb_interface *intf = dev->intf;
	struct video_device *vdev = video_devdata(file);
	int ret;
	unsigned int uitmp;

	dev_dbg(&intf->dev, "tuner=%d type=%d frequency=%u\n",
			f->tuner, f->type, f->frequency);

	if (f->tuner == 0) {
		uitmp = clamp(f->frequency, bands_adc_dac[0].rangelow,
			      bands_adc_dac[0].rangehigh);
		if (vdev->vfl_dir == VFL_DIR_RX) {
			dev->f_adc = uitmp;
			set_bit(RX_ADC_FREQUENCY, &dev->flags);
		} else {
			dev->f_dac = uitmp;
			set_bit(TX_DAC_FREQUENCY, &dev->flags);
		}
	} else if (f->tuner == 1) {
		uitmp = clamp(f->frequency, bands_rx_tx[0].rangelow,
			      bands_rx_tx[0].rangehigh);
		if (vdev->vfl_dir == VFL_DIR_RX) {
			dev->f_rx = uitmp;
			set_bit(RX_RF_FREQUENCY, &dev->flags);
		} else {
			dev->f_tx = uitmp;
			set_bit(TX_RF_FREQUENCY, &dev->flags);
		}
	} else {
		ret = -EINVAL;
		goto err;
	}

	ret = hackrf_set_params(dev);
	if (ret)
		goto err;

	return 0;
err:
	dev_dbg(&intf->dev, "failed=%d\n", ret);
	return ret;
}

static int hackrf_g_frequency(struct file *file, void *priv,
		struct v4l2_frequency *f)
{
	struct hackrf_dev *dev = video_drvdata(file);
	struct usb_interface *intf = dev->intf;
	struct video_device *vdev = video_devdata(file);
	int ret;

	dev_dbg(dev->dev, "tuner=%d type=%d\n", f->tuner, f->type);

	if (f->tuner == 0) {
		f->type = V4L2_TUNER_SDR;
		if (vdev->vfl_dir == VFL_DIR_RX)
			f->frequency = dev->f_adc;
		else
			f->frequency = dev->f_dac;
	} else if (f->tuner == 1) {
		f->type = V4L2_TUNER_RF;
		if (vdev->vfl_dir == VFL_DIR_RX)
			f->frequency = dev->f_rx;
		else
			f->frequency = dev->f_tx;
	} else {
		ret = -EINVAL;
		goto err;
	}

	return 0;
err:
	dev_dbg(&intf->dev, "failed=%d\n", ret);
	return ret;
}

static int hackrf_enum_freq_bands(struct file *file, void *priv,
		struct v4l2_frequency_band *band)
{
	struct hackrf_dev *dev = video_drvdata(file);
	int ret;

	dev_dbg(dev->dev, "tuner=%d type=%d index=%d\n",
			band->tuner, band->type, band->index);

	if (band->tuner == 0) {
		if (band->index >= ARRAY_SIZE(bands_adc_dac)) {
			ret = -EINVAL;
		} else {
			*band = bands_adc_dac[band->index];
			ret = 0;
		}
	} else if (band->tuner == 1) {
		if (band->index >= ARRAY_SIZE(bands_rx_tx)) {
			ret = -EINVAL;
		} else {
			*band = bands_rx_tx[band->index];
			ret = 0;
		}
	} else {
		ret = -EINVAL;
	}

	return ret;
}

static const struct v4l2_ioctl_ops hackrf_ioctl_ops = {
	.vidioc_querycap          = hackrf_querycap,

	.vidioc_s_fmt_sdr_cap     = hackrf_s_fmt_sdr,
	.vidioc_g_fmt_sdr_cap     = hackrf_g_fmt_sdr,
	.vidioc_enum_fmt_sdr_cap  = hackrf_enum_fmt_sdr,
	.vidioc_try_fmt_sdr_cap   = hackrf_try_fmt_sdr,

	.vidioc_s_fmt_sdr_out     = hackrf_s_fmt_sdr,
	.vidioc_g_fmt_sdr_out     = hackrf_g_fmt_sdr,
	.vidioc_enum_fmt_sdr_out  = hackrf_enum_fmt_sdr,
	.vidioc_try_fmt_sdr_out   = hackrf_try_fmt_sdr,

	.vidioc_reqbufs           = vb2_ioctl_reqbufs,
	.vidioc_create_bufs       = vb2_ioctl_create_bufs,
	.vidioc_prepare_buf       = vb2_ioctl_prepare_buf,
	.vidioc_querybuf          = vb2_ioctl_querybuf,
	.vidioc_qbuf              = vb2_ioctl_qbuf,
	.vidioc_dqbuf             = vb2_ioctl_dqbuf,
	.vidioc_expbuf            = vb2_ioctl_expbuf,

	.vidioc_streamon          = vb2_ioctl_streamon,
	.vidioc_streamoff         = vb2_ioctl_streamoff,

	.vidioc_s_tuner           = hackrf_s_tuner,
	.vidioc_g_tuner           = hackrf_g_tuner,

	.vidioc_s_modulator       = hackrf_s_modulator,
	.vidioc_g_modulator       = hackrf_g_modulator,

	.vidioc_s_frequency       = hackrf_s_frequency,
	.vidioc_g_frequency       = hackrf_g_frequency,
	.vidioc_enum_freq_bands   = hackrf_enum_freq_bands,

	.vidioc_subscribe_event   = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
	.vidioc_log_status        = v4l2_ctrl_log_status,
};

static const struct v4l2_file_operations hackrf_fops = {
	.owner                    = THIS_MODULE,
	.open                     = v4l2_fh_open,
	.release                  = vb2_fop_release,
	.read                     = vb2_fop_read,
	.write                    = vb2_fop_write,
	.poll                     = vb2_fop_poll,
	.mmap                     = vb2_fop_mmap,
	.unlocked_ioctl           = video_ioctl2,
};

static struct video_device hackrf_template = {
	.name                     = "HackRF One",
	.release                  = video_device_release_empty,
	.fops                     = &hackrf_fops,
	.ioctl_ops                = &hackrf_ioctl_ops,
};

static void hackrf_video_release(struct v4l2_device *v)
{
	struct hackrf_dev *dev = container_of(v, struct hackrf_dev, v4l2_dev);

	dev_dbg(dev->dev, "\n");

	v4l2_ctrl_handler_free(&dev->rx_ctrl_handler);
	v4l2_ctrl_handler_free(&dev->tx_ctrl_handler);
	v4l2_device_unregister(&dev->v4l2_dev);
	kfree(dev);
}

static int hackrf_s_ctrl_rx(struct v4l2_ctrl *ctrl)
{
	struct hackrf_dev *dev = container_of(ctrl->handler,
			struct hackrf_dev, rx_ctrl_handler);
	struct usb_interface *intf = dev->intf;
	int ret;

	switch (ctrl->id) {
	case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
	case V4L2_CID_RF_TUNER_BANDWIDTH:
		set_bit(RX_BANDWIDTH, &dev->flags);
		break;
	case  V4L2_CID_RF_TUNER_RF_GAIN:
		set_bit(RX_RF_GAIN, &dev->flags);
		break;
	case  V4L2_CID_RF_TUNER_LNA_GAIN:
		set_bit(RX_LNA_GAIN, &dev->flags);
		break;
	case  V4L2_CID_RF_TUNER_IF_GAIN:
		set_bit(RX_IF_GAIN, &dev->flags);
		break;
	default:
		dev_dbg(&intf->dev, "unknown ctrl: id=%d name=%s\n",
			ctrl->id, ctrl->name);
		ret = -EINVAL;
		goto err;
	}

	ret = hackrf_set_params(dev);
	if (ret)
		goto err;

	return 0;
err:
	dev_dbg(&intf->dev, "failed=%d\n", ret);
	return ret;
}

static int hackrf_s_ctrl_tx(struct v4l2_ctrl *ctrl)
{
	struct hackrf_dev *dev = container_of(ctrl->handler,
			struct hackrf_dev, tx_ctrl_handler);
	struct usb_interface *intf = dev->intf;
	int ret;

	switch (ctrl->id) {
	case V4L2_CID_RF_TUNER_BANDWIDTH_AUTO:
	case V4L2_CID_RF_TUNER_BANDWIDTH:
		set_bit(TX_BANDWIDTH, &dev->flags);
		break;
	case  V4L2_CID_RF_TUNER_LNA_GAIN:
		set_bit(TX_LNA_GAIN, &dev->flags);
		break;
	case  V4L2_CID_RF_TUNER_RF_GAIN:
		set_bit(TX_RF_GAIN, &dev->flags);
		break;
	default:
		dev_dbg(&intf->dev, "unknown ctrl: id=%d name=%s\n",
			ctrl->id, ctrl->name);
		ret = -EINVAL;
		goto err;
	}

	ret = hackrf_set_params(dev);
	if (ret)
		goto err;

	return 0;
err:
	dev_dbg(&intf->dev, "failed=%d\n", ret);
	return ret;
}

static const struct v4l2_ctrl_ops hackrf_ctrl_ops_rx = {
	.s_ctrl = hackrf_s_ctrl_rx,
};

static const struct v4l2_ctrl_ops hackrf_ctrl_ops_tx = {
	.s_ctrl = hackrf_s_ctrl_tx,
};

static int hackrf_probe(struct usb_interface *intf,
		const struct usb_device_id *id)
{
	struct hackrf_dev *dev;
	int ret;
	u8 u8tmp, buf[BUF_SIZE];

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev) {
		ret = -ENOMEM;
		goto err;
	}

	mutex_init(&dev->v4l2_lock);
	mutex_init(&dev->vb_queue_lock);
	spin_lock_init(&dev->buffer_list_lock);
	INIT_LIST_HEAD(&dev->rx_buffer_list);
	INIT_LIST_HEAD(&dev->tx_buffer_list);
	dev->intf = intf;
	dev->dev = &intf->dev;
	dev->udev = interface_to_usbdev(intf);
	dev->pixelformat = formats[0].pixelformat;
	dev->buffersize = formats[0].buffersize;
	dev->f_adc = bands_adc_dac[0].rangelow;
	dev->f_dac = bands_adc_dac[0].rangelow;
	dev->f_rx = bands_rx_tx[0].rangelow;
	dev->f_tx = bands_rx_tx[0].rangelow;
	set_bit(RX_ADC_FREQUENCY, &dev->flags);
	set_bit(TX_DAC_FREQUENCY, &dev->flags);
	set_bit(RX_RF_FREQUENCY, &dev->flags);
	set_bit(TX_RF_FREQUENCY, &dev->flags);

	/* Detect device */
	ret = hackrf_ctrl_msg(dev, CMD_BOARD_ID_READ, 0, 0, &u8tmp, 1);
	if (ret == 0)
		ret = hackrf_ctrl_msg(dev, CMD_VERSION_STRING_READ, 0, 0,
				buf, BUF_SIZE);
	if (ret) {
		dev_err(dev->dev, "Could not detect board\n");
		goto err_kfree;
	}

	buf[BUF_SIZE - 1] = '\0';
	dev_info(dev->dev, "Board ID: %02x\n", u8tmp);
	dev_info(dev->dev, "Firmware version: %s\n", buf);

	/* Init vb2 queue structure for receiver */
	dev->rx_vb2_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
	dev->rx_vb2_queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF |
				     VB2_READ;
	dev->rx_vb2_queue.ops = &hackrf_vb2_ops;
	dev->rx_vb2_queue.mem_ops = &vb2_vmalloc_memops;
	dev->rx_vb2_queue.drv_priv = dev;
	dev->rx_vb2_queue.buf_struct_size = sizeof(struct hackrf_buffer);
	dev->rx_vb2_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	ret = vb2_queue_init(&dev->rx_vb2_queue);
	if (ret) {
		dev_err(dev->dev, "Could not initialize rx vb2 queue\n");
		goto err_kfree;
	}

	/* Init vb2 queue structure for transmitter */
	dev->tx_vb2_queue.type = V4L2_BUF_TYPE_SDR_OUTPUT;
	dev->tx_vb2_queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF |
				     VB2_WRITE;
	dev->tx_vb2_queue.ops = &hackrf_vb2_ops;
	dev->tx_vb2_queue.mem_ops = &vb2_vmalloc_memops;
	dev->tx_vb2_queue.drv_priv = dev;
	dev->tx_vb2_queue.buf_struct_size = sizeof(struct hackrf_buffer);
	dev->tx_vb2_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	ret = vb2_queue_init(&dev->tx_vb2_queue);
	if (ret) {
		dev_err(dev->dev, "Could not initialize tx vb2 queue\n");
		goto err_kfree;
	}

	/* Register controls for receiver */
	v4l2_ctrl_handler_init(&dev->rx_ctrl_handler, 5);
	dev->rx_bandwidth_auto = v4l2_ctrl_new_std(&dev->rx_ctrl_handler,
		&hackrf_ctrl_ops_rx, V4L2_CID_RF_TUNER_BANDWIDTH_AUTO,
		0, 1, 0, 1);
	dev->rx_bandwidth = v4l2_ctrl_new_std(&dev->rx_ctrl_handler,
		&hackrf_ctrl_ops_rx, V4L2_CID_RF_TUNER_BANDWIDTH,
		1750000, 28000000, 50000, 1750000);
	v4l2_ctrl_auto_cluster(2, &dev->rx_bandwidth_auto, 0, false);
	dev->rx_rf_gain = v4l2_ctrl_new_std(&dev->rx_ctrl_handler,
		&hackrf_ctrl_ops_rx, V4L2_CID_RF_TUNER_RF_GAIN, 0, 12, 12, 0);
	dev->rx_lna_gain = v4l2_ctrl_new_std(&dev->rx_ctrl_handler,
		&hackrf_ctrl_ops_rx, V4L2_CID_RF_TUNER_LNA_GAIN, 0, 40, 8, 0);
	dev->rx_if_gain = v4l2_ctrl_new_std(&dev->rx_ctrl_handler,
		&hackrf_ctrl_ops_rx, V4L2_CID_RF_TUNER_IF_GAIN, 0, 62, 2, 0);
	if (dev->rx_ctrl_handler.error) {
		ret = dev->rx_ctrl_handler.error;
		dev_err(dev->dev, "Could not initialize controls\n");
		goto err_v4l2_ctrl_handler_free_rx;
	}
	v4l2_ctrl_handler_setup(&dev->rx_ctrl_handler);

	/* Register controls for transmitter */
	v4l2_ctrl_handler_init(&dev->tx_ctrl_handler, 4);
	dev->tx_bandwidth_auto = v4l2_ctrl_new_std(&dev->tx_ctrl_handler,
		&hackrf_ctrl_ops_tx, V4L2_CID_RF_TUNER_BANDWIDTH_AUTO,
		0, 1, 0, 1);
	dev->tx_bandwidth = v4l2_ctrl_new_std(&dev->tx_ctrl_handler,
		&hackrf_ctrl_ops_tx, V4L2_CID_RF_TUNER_BANDWIDTH,
		1750000, 28000000, 50000, 1750000);
	v4l2_ctrl_auto_cluster(2, &dev->tx_bandwidth_auto, 0, false);
	dev->tx_lna_gain = v4l2_ctrl_new_std(&dev->tx_ctrl_handler,
		&hackrf_ctrl_ops_tx, V4L2_CID_RF_TUNER_LNA_GAIN, 0, 47, 1, 0);
	dev->tx_rf_gain = v4l2_ctrl_new_std(&dev->tx_ctrl_handler,
		&hackrf_ctrl_ops_tx, V4L2_CID_RF_TUNER_RF_GAIN, 0, 15, 15, 0);
	if (dev->tx_ctrl_handler.error) {
		ret = dev->tx_ctrl_handler.error;
		dev_err(dev->dev, "Could not initialize controls\n");
		goto err_v4l2_ctrl_handler_free_tx;
	}
	v4l2_ctrl_handler_setup(&dev->tx_ctrl_handler);

	/* Register the v4l2_device structure */
	dev->v4l2_dev.release = hackrf_video_release;
	ret = v4l2_device_register(&intf->dev, &dev->v4l2_dev);
	if (ret) {
		dev_err(dev->dev, "Failed to register v4l2-device (%d)\n", ret);
		goto err_v4l2_ctrl_handler_free_tx;
	}

	/* Init video_device structure for receiver */
	dev->rx_vdev = hackrf_template;
	dev->rx_vdev.queue = &dev->rx_vb2_queue;
	dev->rx_vdev.queue->lock = &dev->vb_queue_lock;
	dev->rx_vdev.v4l2_dev = &dev->v4l2_dev;
	dev->rx_vdev.ctrl_handler = &dev->rx_ctrl_handler;
	dev->rx_vdev.lock = &dev->v4l2_lock;
	dev->rx_vdev.vfl_dir = VFL_DIR_RX;
	video_set_drvdata(&dev->rx_vdev, dev);
	ret = video_register_device(&dev->rx_vdev, VFL_TYPE_SDR, -1);
	if (ret) {
		dev_err(dev->dev,
			"Failed to register as video device (%d)\n", ret);
		goto err_v4l2_device_unregister;
	}
	dev_info(dev->dev, "Registered as %s\n",
		 video_device_node_name(&dev->rx_vdev));

	/* Init video_device structure for transmitter */
	dev->tx_vdev = hackrf_template;
	dev->tx_vdev.queue = &dev->tx_vb2_queue;
	dev->tx_vdev.queue->lock = &dev->vb_queue_lock;
	dev->tx_vdev.v4l2_dev = &dev->v4l2_dev;
	dev->tx_vdev.ctrl_handler = &dev->tx_ctrl_handler;
	dev->tx_vdev.lock = &dev->v4l2_lock;
	dev->tx_vdev.vfl_dir = VFL_DIR_TX;
	video_set_drvdata(&dev->tx_vdev, dev);
	ret = video_register_device(&dev->tx_vdev, VFL_TYPE_SDR, -1);
	if (ret) {
		dev_err(dev->dev,
			"Failed to register as video device (%d)\n", ret);
		goto err_video_unregister_device_rx;
	}
	dev_info(dev->dev, "Registered as %s\n",
		 video_device_node_name(&dev->tx_vdev));

	dev_notice(dev->dev, "SDR API is still slightly experimental and functionality changes may follow\n");
	return 0;
err_video_unregister_device_rx:
	video_unregister_device(&dev->rx_vdev);
err_v4l2_device_unregister:
	v4l2_device_unregister(&dev->v4l2_dev);
err_v4l2_ctrl_handler_free_tx:
	v4l2_ctrl_handler_free(&dev->tx_ctrl_handler);
err_v4l2_ctrl_handler_free_rx:
	v4l2_ctrl_handler_free(&dev->rx_ctrl_handler);
err_kfree:
	kfree(dev);
err:
	dev_dbg(dev->dev, "failed=%d\n", ret);
	return ret;
}

/* USB device ID list */
static struct usb_device_id hackrf_id_table[] = {
	{ USB_DEVICE(0x1d50, 0x6089) }, /* HackRF One */
	{ }
};
MODULE_DEVICE_TABLE(usb, hackrf_id_table);

/* USB subsystem interface */
static struct usb_driver hackrf_driver = {
	.name                     = KBUILD_MODNAME,
	.probe                    = hackrf_probe,
	.disconnect               = hackrf_disconnect,
	.id_table                 = hackrf_id_table,
};

module_usb_driver(hackrf_driver);

MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("HackRF");
MODULE_LICENSE("GPL");

Privacy Policy