summaryrefslogtreecommitdiffstats
path: root/drivers/misc/mei/hdcp/mei_hdcp.c
blob: b07000202d4a1ad093b67523422078cce34a142f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright © 2019 Intel Corporation
 *
 * Mei_hdcp.c: HDCP client driver for mei bus
 *
 * Author:
 * Ramalingam C <ramalingam.c@intel.com>
 */

/**
 * DOC: MEI_HDCP Client Driver
 *
 * This is a client driver to the mei_bus to make the HDCP2.2 services of
 * ME FW available for the interested consumers like I915.
 *
 * This module will act as a translation layer between HDCP protocol
 * implementor(I915) and ME FW by translating HDCP2.2 authentication
 * messages to ME FW command payloads and vice versa.
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/mei_cl_bus.h>
#include <linux/component.h>
#include <drm/drm_connector.h>
#include <drm/i915_component.h>
#include <drm/i915_mei_hdcp_interface.h>

#include "mei_hdcp.h"

static inline u8 mei_get_ddi_index(enum port port)
{
	switch (port) {
	case PORT_A:
		return MEI_DDI_A;
	case PORT_B ... PORT_F:
		return (u8)port;
	default:
		return MEI_DDI_INVALID_PORT;
	}
}

/**
 * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @ake_data: AKE_Init msg output.
 *
 * Return:  0 on Success, <0 on Failure.
 */
static int
mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_data *data,
			  struct hdcp2_ake_init *ake_data)
{
	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
	struct wired_cmd_initiate_hdcp2_session_out
						session_init_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !ake_data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	session_init_in.header.api_version = HDCP_API_VERSION;
	session_init_in.header.command_id = WIRED_INITIATE_HDCP2_SESSION;
	session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
	session_init_in.header.buffer_len =
				WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;

	session_init_in.port.integrated_port_type = data->port_type;
	session_init_in.port.physical_port = mei_get_ddi_index(data->port);
	session_init_in.protocol = data->protocol;

	byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
			      sizeof(session_init_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
			      sizeof(session_init_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
			WIRED_INITIATE_HDCP2_SESSION,
			session_init_out.header.status);
		return -EIO;
	}

	ake_data->msg_id = HDCP_2_2_AKE_INIT;
	ake_data->tx_caps = session_init_out.tx_caps;
	memcpy(ake_data->r_tx, session_init_out.r_tx, HDCP_2_2_RTX_LEN);

	return 0;
}

/**
 * mei_hdcp_verify_receiver_cert_prepare_km() - Verify the Receiver Certificate
 * AKE_Send_Cert and prepare AKE_Stored_Km/AKE_No_Stored_Km
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @rx_cert: AKE_Send_Cert for verification
 * @km_stored: Pairing status flag output
 * @ek_pub_km: AKE_Stored_Km/AKE_No_Stored_Km output msg
 * @msg_sz : size of AKE_XXXXX_Km output msg
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_verify_receiver_cert_prepare_km(struct device *dev,
					 struct hdcp_port_data *data,
					 struct hdcp2_ake_send_cert *rx_cert,
					 bool *km_stored,
					 struct hdcp2_ake_no_stored_km
								*ek_pub_km,
					 size_t *msg_sz)
{
	struct wired_cmd_verify_receiver_cert_in verify_rxcert_in = { { 0 } };
	struct wired_cmd_verify_receiver_cert_out verify_rxcert_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !rx_cert || !km_stored || !ek_pub_km || !msg_sz)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	verify_rxcert_in.header.api_version = HDCP_API_VERSION;
	verify_rxcert_in.header.command_id = WIRED_VERIFY_RECEIVER_CERT;
	verify_rxcert_in.header.status = ME_HDCP_STATUS_SUCCESS;
	verify_rxcert_in.header.buffer_len =
				WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN;

	verify_rxcert_in.port.integrated_port_type = data->port_type;
	verify_rxcert_in.port.physical_port = mei_get_ddi_index(data->port);

	verify_rxcert_in.cert_rx = rx_cert->cert_rx;
	memcpy(verify_rxcert_in.r_rx, &rx_cert->r_rx, HDCP_2_2_RRX_LEN);
	memcpy(verify_rxcert_in.rx_caps, rx_cert->rx_caps, HDCP_2_2_RXCAPS_LEN);

	byte = mei_cldev_send(cldev, (u8 *)&verify_rxcert_in,
			      sizeof(verify_rxcert_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed: %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&verify_rxcert_out,
			      sizeof(verify_rxcert_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed: %zd\n", byte);
		return byte;
	}

	if (verify_rxcert_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
			WIRED_VERIFY_RECEIVER_CERT,
			verify_rxcert_out.header.status);
		return -EIO;
	}

	*km_stored = !!verify_rxcert_out.km_stored;
	if (verify_rxcert_out.km_stored) {
		ek_pub_km->msg_id = HDCP_2_2_AKE_STORED_KM;
		*msg_sz = sizeof(struct hdcp2_ake_stored_km);
	} else {
		ek_pub_km->msg_id = HDCP_2_2_AKE_NO_STORED_KM;
		*msg_sz = sizeof(struct hdcp2_ake_no_stored_km);
	}

	memcpy(ek_pub_km->e_kpub_km, &verify_rxcert_out.ekm_buff,
	       sizeof(verify_rxcert_out.ekm_buff));

	return 0;
}

/**
 * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
		       struct hdcp2_ake_send_hprime *rx_hprime)
{
	struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
	struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !rx_hprime)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	send_hprime_in.header.api_version = HDCP_API_VERSION;
	send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
	send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
	send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;

	send_hprime_in.port.integrated_port_type = data->port_type;
	send_hprime_in.port.physical_port = mei_get_ddi_index(data->port);

	memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
	       HDCP_2_2_H_PRIME_LEN);

	byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
			      sizeof(send_hprime_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
			      sizeof(send_hprime_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
			WIRED_AKE_SEND_HPRIME, send_hprime_out.header.status);
		return -EIO;
	}

	return 0;
}

/**
 * mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
			    struct hdcp2_ake_send_pairing_info *pairing_info)
{
	struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
	struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !pairing_info)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	pairing_info_in.header.api_version = HDCP_API_VERSION;
	pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
	pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
	pairing_info_in.header.buffer_len =
					WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;

	pairing_info_in.port.integrated_port_type = data->port_type;
	pairing_info_in.port.physical_port = mei_get_ddi_index(data->port);

	memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
	       HDCP_2_2_E_KH_KM_LEN);

	byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
			      sizeof(pairing_info_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
			      sizeof(pairing_info_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
			WIRED_AKE_SEND_PAIRING_INFO,
			pairing_info_out.header.status);
		return -EIO;
	}

	return 0;
}

/**
 * mei_hdcp_initiate_locality_check() - Prepare LC_Init
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @lc_init_data: LC_Init msg output
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_initiate_locality_check(struct device *dev,
				 struct hdcp_port_data *data,
				 struct hdcp2_lc_init *lc_init_data)
{
	struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
	struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !lc_init_data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	lc_init_in.header.api_version = HDCP_API_VERSION;
	lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
	lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
	lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;

	lc_init_in.port.integrated_port_type = data->port_type;
	lc_init_in.port.physical_port = mei_get_ddi_index(data->port);

	byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
			WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
		return -EIO;
	}

	lc_init_data->msg_id = HDCP_2_2_LC_INIT;
	memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);

	return 0;
}

/**
 * mei_hdcp_verify_lprime() - Verify lprime.
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @rx_lprime: LC_Send_L_prime msg for ME FW verification
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
		       struct hdcp2_lc_send_lprime *rx_lprime)
{
	struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
	struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !rx_lprime)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	verify_lprime_in.header.api_version = HDCP_API_VERSION;
	verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
	verify_lprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
	verify_lprime_in.header.buffer_len =
					WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;

	verify_lprime_in.port.integrated_port_type = data->port_type;
	verify_lprime_in.port.physical_port = mei_get_ddi_index(data->port);

	memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
	       HDCP_2_2_L_PRIME_LEN);

	byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
			      sizeof(verify_lprime_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
			      sizeof(verify_lprime_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (verify_lprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
			WIRED_VALIDATE_LOCALITY,
			verify_lprime_out.header.status);
		return -EIO;
	}

	return 0;
}

/**
 * mei_hdcp_get_session_key() - Prepare SKE_Send_Eks.
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @ske_data: SKE_Send_Eks msg output from ME FW.
 *
 * Return: 0 on Success, <0 on Failure
 */
static int mei_hdcp_get_session_key(struct device *dev,
				    struct hdcp_port_data *data,
				    struct hdcp2_ske_send_eks *ske_data)
{
	struct wired_cmd_get_session_key_in get_skey_in = { { 0 } };
	struct wired_cmd_get_session_key_out get_skey_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data || !ske_data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	get_skey_in.header.api_version = HDCP_API_VERSION;
	get_skey_in.header.command_id = WIRED_GET_SESSION_KEY;
	get_skey_in.header.status = ME_HDCP_STATUS_SUCCESS;
	get_skey_in.header.buffer_len = WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN;

	get_skey_in.port.integrated_port_type = data->port_type;
	get_skey_in.port.physical_port = mei_get_ddi_index(data->port);

	byte = mei_cldev_send(cldev, (u8 *)&get_skey_in, sizeof(get_skey_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&get_skey_out, sizeof(get_skey_out));

	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (get_skey_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
			WIRED_GET_SESSION_KEY, get_skey_out.header.status);
		return -EIO;
	}

	ske_data->msg_id = HDCP_2_2_SKE_SEND_EKS;
	memcpy(ske_data->e_dkey_ks, get_skey_out.e_dkey_ks,
	       HDCP_2_2_E_DKEY_KS_LEN);
	memcpy(ske_data->riv, get_skey_out.r_iv, HDCP_2_2_RIV_LEN);

	return 0;
}

/**
 * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream topology
 * and prepare rep_ack.
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @rep_topology: Receiver ID List to be validated
 * @rep_send_ack : repeater ack from ME FW.
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
					 struct hdcp_port_data *data,
					 struct hdcp2_rep_send_receiverid_list
							*rep_topology,
					 struct hdcp2_rep_send_ack
							*rep_send_ack)
{
	struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
	struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !rep_topology || !rep_send_ack || !data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	verify_repeater_in.header.api_version = HDCP_API_VERSION;
	verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
	verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
	verify_repeater_in.header.buffer_len =
					WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;

	verify_repeater_in.port.integrated_port_type = data->port_type;
	verify_repeater_in.port.physical_port = mei_get_ddi_index(data->port);

	memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
	       HDCP_2_2_RXINFO_LEN);
	memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
	       HDCP_2_2_SEQ_NUM_LEN);
	memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
	       HDCP_2_2_V_PRIME_HALF_LEN);
	memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
	       HDCP_2_2_RECEIVER_IDS_MAX_LEN);

	byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
			      sizeof(verify_repeater_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
			      sizeof(verify_repeater_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
			WIRED_VERIFY_REPEATER,
			verify_repeater_out.header.status);
		return -EIO;
	}

	memcpy(rep_send_ack->v, verify_repeater_out.v,
	       HDCP_2_2_V_PRIME_HALF_LEN);
	rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;

	return 0;
}

/**
 * mei_hdcp_verify_mprime() - Verify mprime.
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
 *
 * Return: 0 on Success, <0 on Failure
 */
static int mei_hdcp_verify_mprime(struct device *dev,
				  struct hdcp_port_data *data,
				  struct hdcp2_rep_stream_ready *stream_ready)
{
	struct wired_cmd_repeater_auth_stream_req_in
					verify_mprime_in = { { 0 } };
	struct wired_cmd_repeater_auth_stream_req_out
					verify_mprime_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !stream_ready || !data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	verify_mprime_in.header.api_version = HDCP_API_VERSION;
	verify_mprime_in.header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
	verify_mprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
	verify_mprime_in.header.buffer_len =
			WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN;

	verify_mprime_in.port.integrated_port_type = data->port_type;
	verify_mprime_in.port.physical_port = mei_get_ddi_index(data->port);

	memcpy(verify_mprime_in.m_prime, stream_ready->m_prime,
	       HDCP_2_2_MPRIME_LEN);
	drm_hdcp2_u32_to_seq_num(verify_mprime_in.seq_num_m, data->seq_num_m);
	memcpy(verify_mprime_in.streams, data->streams,
	       (data->k * sizeof(struct hdcp2_streamid_type)));

	verify_mprime_in.k = cpu_to_be16(data->k);

	byte = mei_cldev_send(cldev, (u8 *)&verify_mprime_in,
			      sizeof(verify_mprime_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
			      sizeof(verify_mprime_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
			WIRED_REPEATER_AUTH_STREAM_REQ,
			verify_mprime_out.header.status);
		return -EIO;
	}

	return 0;
}

/**
 * mei_hdcp_enable_authentication() - Mark a port as authenticated
 * through ME FW
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 *
 * Return: 0 on Success, <0 on Failure
 */
static int mei_hdcp_enable_authentication(struct device *dev,
					  struct hdcp_port_data *data)
{
	struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
	struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	enable_auth_in.header.api_version = HDCP_API_VERSION;
	enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
	enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
	enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;

	enable_auth_in.port.integrated_port_type = data->port_type;
	enable_auth_in.port.physical_port = mei_get_ddi_index(data->port);
	enable_auth_in.stream_type = data->streams[0].stream_type;

	byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
			      sizeof(enable_auth_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
			      sizeof(enable_auth_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
			WIRED_ENABLE_AUTH, enable_auth_out.header.status);
		return -EIO;
	}

	return 0;
}

/**
 * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per port.
 * This also disables the authenticated state of the port.
 * @dev: device corresponding to the mei_cl_device
 * @data: Intel HW specific hdcp data
 *
 * Return: 0 on Success, <0 on Failure
 */
static int
mei_hdcp_close_session(struct device *dev, struct hdcp_port_data *data)
{
	struct wired_cmd_close_session_in session_close_in = { { 0 } };
	struct wired_cmd_close_session_out session_close_out = { { 0 } };
	struct mei_cl_device *cldev;
	ssize_t byte;

	if (!dev || !data)
		return -EINVAL;

	cldev = to_mei_cl_device(dev);

	session_close_in.header.api_version = HDCP_API_VERSION;
	session_close_in.header.command_id = WIRED_CLOSE_SESSION;
	session_close_in.header.status = ME_HDCP_STATUS_SUCCESS;
	session_close_in.header.buffer_len =
				WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;

	session_close_in.port.integrated_port_type = data->port_type;
	session_close_in.port.physical_port = mei_get_ddi_index(data->port);

	byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
			      sizeof(session_close_in));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
		return byte;
	}

	byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
			      sizeof(session_close_out));
	if (byte < 0) {
		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
		return byte;
	}

	if (session_close_out.header.status != ME_HDCP_STATUS_SUCCESS) {
		dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
			session_close_out.header.status);
		return -EIO;
	}

	return 0;
}

static const struct i915_hdcp_component_ops mei_hdcp_ops = {
	.owner = THIS_MODULE,
	.initiate_hdcp2_session = mei_hdcp_initiate_session,
	.verify_receiver_cert_prepare_km =
				mei_hdcp_verify_receiver_cert_prepare_km,
	.verify_hprime = mei_hdcp_verify_hprime,
	.store_pairing_info = mei_hdcp_store_pairing_info,
	.initiate_locality_check = mei_hdcp_initiate_locality_check,
	.verify_lprime = mei_hdcp_verify_lprime,
	.get_session_key = mei_hdcp_get_session_key,
	.repeater_check_flow_prepare_ack =
				mei_hdcp_repeater_check_flow_prepare_ack,
	.verify_mprime = mei_hdcp_verify_mprime,
	.enable_hdcp_authentication = mei_hdcp_enable_authentication,
	.close_hdcp_session = mei_hdcp_close_session,
};

static int mei_component_master_bind(struct device *dev)
{
	struct mei_cl_device *cldev = to_mei_cl_device(dev);
	struct i915_hdcp_comp_master *comp_master =
						mei_cldev_get_drvdata(cldev);
	int ret;

	dev_dbg(dev, "%s\n", __func__);
	comp_master->ops = &mei_hdcp_ops;
	comp_master->mei_dev = dev;
	ret = component_bind_all(dev, comp_master);
	if (ret < 0)
		return ret;

	return 0;
}

static void mei_component_master_unbind(struct device *dev)
{
	struct mei_cl_device *cldev = to_mei_cl_device(dev);
	struct i915_hdcp_comp_master *comp_master =
						mei_cldev_get_drvdata(cldev);

	dev_dbg(dev, "%s\n", __func__);
	component_unbind_all(dev, comp_master);
}

static const struct component_master_ops mei_component_master_ops = {
	.bind = mei_component_master_bind,
	.unbind = mei_component_master_unbind,
};

static int mei_hdcp_component_match(struct device *dev, int subcomponent,
				    void *data)
{
	return !strcmp(dev->driver->name, "i915") &&
	       subcomponent == I915_COMPONENT_HDCP;
}

static int mei_hdcp_probe(struct mei_cl_device *cldev,
			  const struct mei_cl_device_id *id)
{
	struct i915_hdcp_comp_master *comp_master;
	struct component_match *master_match;
	int ret;

	ret = mei_cldev_enable(cldev);
	if (ret < 0) {
		dev_err(&cldev->dev, "mei_cldev_enable Failed. %d\n", ret);
		goto enable_err_exit;
	}

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

	master_match = NULL;
	component_match_add_typed(&cldev->dev, &master_match,
				  mei_hdcp_component_match, comp_master);
	if (IS_ERR_OR_NULL(master_match)) {
		ret = -ENOMEM;
		goto err_exit;
	}

	mei_cldev_set_drvdata(cldev, comp_master);
	ret = component_master_add_with_match(&cldev->dev,
					      &mei_component_master_ops,
					      master_match);
	if (ret < 0) {
		dev_err(&cldev->dev, "Master comp add failed %d\n", ret);
		goto err_exit;
	}

	return 0;

err_exit:
	mei_cldev_set_drvdata(cldev, NULL);
	kfree(comp_master);
	mei_cldev_disable(cldev);
enable_err_exit:
	return ret;
}

static int mei_hdcp_remove(struct mei_cl_device *cldev)
{
	struct i915_hdcp_comp_master *comp_master =
						mei_cldev_get_drvdata(cldev);

	component_master_del(&cldev->dev, &mei_component_master_ops);
	kfree(comp_master);
	mei_cldev_set_drvdata(cldev, NULL);

	return mei_cldev_disable(cldev);
}

#define MEI_UUID_HDCP GUID_INIT(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
				0x52, 0xD1, 0xC5, 0x4B, 0x62, 0x7F, 0x04)

static struct mei_cl_device_id mei_hdcp_tbl[] = {
	{ .uuid = MEI_UUID_HDCP, .version = MEI_CL_VERSION_ANY },
	{ }
};
MODULE_DEVICE_TABLE(mei, mei_hdcp_tbl);

static struct mei_cl_driver mei_hdcp_driver = {
	.id_table = mei_hdcp_tbl,
	.name = KBUILD_MODNAME,
	.probe = mei_hdcp_probe,
	.remove	= mei_hdcp_remove,
};

module_mei_cl_driver(mei_hdcp_driver);

MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MEI HDCP");