1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include "hdcp.h"
27 
28 static inline enum mod_hdcp_status validate_bksv(struct mod_hdcp *hdcp)
29 {
30 	uint64_t n = 0;
31 	uint8_t count = 0;
32 	u8 bksv[sizeof(n)] = { };
33 
34 	memcpy(bksv, hdcp->auth.msg.hdcp1.bksv, sizeof(hdcp->auth.msg.hdcp1.bksv));
35 	n = *(uint64_t *)bksv;
36 
37 	while (n) {
38 		count++;
39 		n &= (n - 1);
40 	}
41 	return (count == 20) ? MOD_HDCP_STATUS_SUCCESS :
42 			MOD_HDCP_STATUS_HDCP1_INVALID_BKSV;
43 }
44 
45 static inline enum mod_hdcp_status check_ksv_ready(struct mod_hdcp *hdcp)
46 {
47 	if (is_dp_hdcp(hdcp))
48 		return (hdcp->auth.msg.hdcp1.bstatus & DP_BSTATUS_READY) ?
49 				MOD_HDCP_STATUS_SUCCESS :
50 				MOD_HDCP_STATUS_HDCP1_KSV_LIST_NOT_READY;
51 	return (hdcp->auth.msg.hdcp1.bcaps & DRM_HDCP_DDC_BCAPS_KSV_FIFO_READY) ?
52 			MOD_HDCP_STATUS_SUCCESS :
53 			MOD_HDCP_STATUS_HDCP1_KSV_LIST_NOT_READY;
54 }
55 
56 static inline enum mod_hdcp_status check_hdcp_capable_dp(struct mod_hdcp *hdcp)
57 {
58 	return (hdcp->auth.msg.hdcp1.bcaps & DP_BCAPS_HDCP_CAPABLE) ?
59 			MOD_HDCP_STATUS_SUCCESS :
60 			MOD_HDCP_STATUS_HDCP1_NOT_CAPABLE;
61 }
62 
63 static inline enum mod_hdcp_status check_r0p_available_dp(struct mod_hdcp *hdcp)
64 {
65 	enum mod_hdcp_status status;
66 	if (is_dp_hdcp(hdcp)) {
67 		status = (hdcp->auth.msg.hdcp1.bstatus &
68 				DP_BSTATUS_R0_PRIME_READY) ?
69 			MOD_HDCP_STATUS_SUCCESS :
70 			MOD_HDCP_STATUS_HDCP1_R0_PRIME_PENDING;
71 	} else {
72 		status = MOD_HDCP_STATUS_INVALID_OPERATION;
73 	}
74 	return status;
75 }
76 
77 static inline enum mod_hdcp_status check_link_integrity_dp(
78 		struct mod_hdcp *hdcp)
79 {
80 	return (hdcp->auth.msg.hdcp1.bstatus &
81 			DP_BSTATUS_LINK_FAILURE) ?
82 			MOD_HDCP_STATUS_HDCP1_LINK_INTEGRITY_FAILURE :
83 			MOD_HDCP_STATUS_SUCCESS;
84 }
85 
86 static inline enum mod_hdcp_status check_no_reauthentication_request_dp(
87 		struct mod_hdcp *hdcp)
88 {
89 	return (hdcp->auth.msg.hdcp1.bstatus & DP_BSTATUS_REAUTH_REQ) ?
90 			MOD_HDCP_STATUS_HDCP1_REAUTH_REQUEST_ISSUED :
91 			MOD_HDCP_STATUS_SUCCESS;
92 }
93 
94 static inline enum mod_hdcp_status check_no_max_cascade(struct mod_hdcp *hdcp)
95 {
96 	enum mod_hdcp_status status;
97 
98 	if (is_dp_hdcp(hdcp))
99 		status = DRM_HDCP_MAX_CASCADE_EXCEEDED(hdcp->auth.msg.hdcp1.binfo_dp >> 8)
100 				 ? MOD_HDCP_STATUS_HDCP1_MAX_CASCADE_EXCEEDED_FAILURE
101 				 : MOD_HDCP_STATUS_SUCCESS;
102 	else
103 		status = DRM_HDCP_MAX_CASCADE_EXCEEDED(hdcp->auth.msg.hdcp1.bstatus >> 8)
104 				 ? MOD_HDCP_STATUS_HDCP1_MAX_CASCADE_EXCEEDED_FAILURE
105 				 : MOD_HDCP_STATUS_SUCCESS;
106 	return status;
107 }
108 
109 static inline enum mod_hdcp_status check_no_max_devs(struct mod_hdcp *hdcp)
110 {
111 	enum mod_hdcp_status status;
112 
113 	if (is_dp_hdcp(hdcp))
114 		status = DRM_HDCP_MAX_DEVICE_EXCEEDED(hdcp->auth.msg.hdcp1.binfo_dp) ?
115 				MOD_HDCP_STATUS_HDCP1_MAX_DEVS_EXCEEDED_FAILURE :
116 				MOD_HDCP_STATUS_SUCCESS;
117 	else
118 		status = DRM_HDCP_MAX_DEVICE_EXCEEDED(hdcp->auth.msg.hdcp1.bstatus) ?
119 				MOD_HDCP_STATUS_HDCP1_MAX_DEVS_EXCEEDED_FAILURE :
120 				MOD_HDCP_STATUS_SUCCESS;
121 	return status;
122 }
123 
124 static inline uint8_t get_device_count(struct mod_hdcp *hdcp)
125 {
126 	return is_dp_hdcp(hdcp) ?
127 			DRM_HDCP_NUM_DOWNSTREAM(hdcp->auth.msg.hdcp1.binfo_dp) :
128 			DRM_HDCP_NUM_DOWNSTREAM(hdcp->auth.msg.hdcp1.bstatus);
129 }
130 
131 static inline enum mod_hdcp_status check_device_count(struct mod_hdcp *hdcp)
132 {
133 	/* Avoid device count == 0 to do authentication */
134 	if (0 == get_device_count(hdcp)) {
135 		return MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE;
136 	}
137 
138 	/* Some MST display may choose to report the internal panel as an HDCP RX.
139 	 * To update this condition with 1(because the immediate repeater's internal
140 	 * panel is possibly not included in DEVICE_COUNT) + get_device_count(hdcp).
141 	 * Device count must be greater than or equal to tracked hdcp displays.
142 	 */
143 	return ((1 + get_device_count(hdcp)) < get_active_display_count(hdcp)) ?
144 			MOD_HDCP_STATUS_HDCP1_DEVICE_COUNT_MISMATCH_FAILURE :
145 			MOD_HDCP_STATUS_SUCCESS;
146 }
147 
148 static enum mod_hdcp_status wait_for_active_rx(struct mod_hdcp *hdcp,
149 		struct mod_hdcp_event_context *event_ctx,
150 		struct mod_hdcp_transition_input_hdcp1 *input)
151 {
152 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
153 
154 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
155 		event_ctx->unexpected_event = 1;
156 		goto out;
157 	}
158 
159 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_bksv,
160 			&input->bksv_read, &status,
161 			hdcp, "bksv_read"))
162 		goto out;
163 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
164 			&input->bcaps_read, &status,
165 			hdcp, "bcaps_read"))
166 		goto out;
167 out:
168 	return status;
169 }
170 
171 static enum mod_hdcp_status exchange_ksvs(struct mod_hdcp *hdcp,
172 		struct mod_hdcp_event_context *event_ctx,
173 		struct mod_hdcp_transition_input_hdcp1 *input)
174 {
175 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
176 
177 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
178 		event_ctx->unexpected_event = 1;
179 		goto out;
180 	}
181 
182 	if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_create_session,
183 			&input->create_session, &status,
184 			hdcp, "create_session"))
185 		goto out;
186 	if (!mod_hdcp_execute_and_set(mod_hdcp_write_an,
187 			&input->an_write, &status,
188 			hdcp, "an_write"))
189 		goto out;
190 	if (!mod_hdcp_execute_and_set(mod_hdcp_write_aksv,
191 			&input->aksv_write, &status,
192 			hdcp, "aksv_write"))
193 		goto out;
194 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_bksv,
195 			&input->bksv_read, &status,
196 			hdcp, "bksv_read"))
197 		goto out;
198 	if (!mod_hdcp_execute_and_set(validate_bksv,
199 			&input->bksv_validation, &status,
200 			hdcp, "bksv_validation"))
201 		goto out;
202 	if (hdcp->auth.msg.hdcp1.ainfo) {
203 		if (!mod_hdcp_execute_and_set(mod_hdcp_write_ainfo,
204 				&input->ainfo_write, &status,
205 				hdcp, "ainfo_write"))
206 			goto out;
207 	}
208 out:
209 	return status;
210 }
211 
212 static enum mod_hdcp_status computations_validate_rx_test_for_repeater(
213 		struct mod_hdcp *hdcp,
214 		struct mod_hdcp_event_context *event_ctx,
215 		struct mod_hdcp_transition_input_hdcp1 *input)
216 {
217 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
218 
219 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
220 		event_ctx->unexpected_event = 1;
221 		goto out;
222 	}
223 
224 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_r0p,
225 			&input->r0p_read, &status,
226 			hdcp, "r0p_read"))
227 		goto out;
228 	if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_validate_rx,
229 			&input->rx_validation, &status,
230 			hdcp, "rx_validation"))
231 		goto out;
232 	if (hdcp->connection.is_repeater) {
233 		if (!hdcp->connection.link.adjust.hdcp1.postpone_encryption)
234 			if (!mod_hdcp_execute_and_set(
235 					mod_hdcp_hdcp1_enable_encryption,
236 					&input->encryption, &status,
237 					hdcp, "encryption"))
238 				goto out;
239 	} else {
240 		if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_enable_encryption,
241 				&input->encryption, &status,
242 				hdcp, "encryption"))
243 			goto out;
244 		if (is_dp_mst_hdcp(hdcp))
245 			if (!mod_hdcp_execute_and_set(
246 					mod_hdcp_hdcp1_enable_dp_stream_encryption,
247 					&input->stream_encryption_dp, &status,
248 					hdcp, "stream_encryption_dp"))
249 				goto out;
250 	}
251 out:
252 	return status;
253 }
254 
255 static enum mod_hdcp_status authenticated(struct mod_hdcp *hdcp,
256 		struct mod_hdcp_event_context *event_ctx,
257 		struct mod_hdcp_transition_input_hdcp1 *input)
258 {
259 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
260 
261 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
262 		event_ctx->unexpected_event = 1;
263 		goto out;
264 	}
265 
266 	mod_hdcp_execute_and_set(mod_hdcp_hdcp1_link_maintenance,
267 			&input->link_maintenance, &status,
268 			hdcp, "link_maintenance");
269 out:
270 	return status;
271 }
272 
273 static enum mod_hdcp_status wait_for_ready(struct mod_hdcp *hdcp,
274 		struct mod_hdcp_event_context *event_ctx,
275 		struct mod_hdcp_transition_input_hdcp1 *input)
276 {
277 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
278 
279 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK &&
280 			event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
281 			event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
282 		event_ctx->unexpected_event = 1;
283 		goto out;
284 	}
285 
286 	if (is_dp_hdcp(hdcp)) {
287 		if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
288 				&input->bstatus_read, &status,
289 				hdcp, "bstatus_read"))
290 			goto out;
291 		if (!mod_hdcp_execute_and_set(check_link_integrity_dp,
292 				&input->link_integrity_check, &status,
293 				hdcp, "link_integrity_check"))
294 			goto out;
295 		if (!mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
296 				&input->reauth_request_check, &status,
297 				hdcp, "reauth_request_check"))
298 			goto out;
299 	} else {
300 		if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
301 				&input->bcaps_read, &status,
302 				hdcp, "bcaps_read"))
303 			goto out;
304 	}
305 	if (!mod_hdcp_execute_and_set(check_ksv_ready,
306 			&input->ready_check, &status,
307 			hdcp, "ready_check"))
308 		goto out;
309 out:
310 	return status;
311 }
312 
313 static enum mod_hdcp_status read_ksv_list(struct mod_hdcp *hdcp,
314 		struct mod_hdcp_event_context *event_ctx,
315 		struct mod_hdcp_transition_input_hdcp1 *input)
316 {
317 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
318 	uint8_t device_count;
319 
320 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
321 		event_ctx->unexpected_event = 1;
322 		goto out;
323 	}
324 
325 	if (is_dp_hdcp(hdcp)) {
326 		if (!mod_hdcp_execute_and_set(mod_hdcp_read_binfo,
327 				&input->binfo_read_dp, &status,
328 				hdcp, "binfo_read_dp"))
329 			goto out;
330 	} else {
331 		if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
332 				&input->bstatus_read, &status,
333 				hdcp, "bstatus_read"))
334 			goto out;
335 	}
336 	if (!mod_hdcp_execute_and_set(check_no_max_cascade,
337 			&input->max_cascade_check, &status,
338 			hdcp, "max_cascade_check"))
339 		goto out;
340 	if (!mod_hdcp_execute_and_set(check_no_max_devs,
341 			&input->max_devs_check, &status,
342 			hdcp, "max_devs_check"))
343 		goto out;
344 	if (!mod_hdcp_execute_and_set(check_device_count,
345 			&input->device_count_check, &status,
346 			hdcp, "device_count_check"))
347 		goto out;
348 	device_count = get_device_count(hdcp);
349 	hdcp->auth.msg.hdcp1.ksvlist_size = device_count*5;
350 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_ksvlist,
351 			&input->ksvlist_read, &status,
352 			hdcp, "ksvlist_read"))
353 		goto out;
354 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_vp,
355 			&input->vp_read, &status,
356 			hdcp, "vp_read"))
357 		goto out;
358 	if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_validate_ksvlist_vp,
359 			&input->ksvlist_vp_validation, &status,
360 			hdcp, "ksvlist_vp_validation"))
361 		goto out;
362 	if (input->encryption != PASS)
363 		if (!mod_hdcp_execute_and_set(mod_hdcp_hdcp1_enable_encryption,
364 				&input->encryption, &status,
365 				hdcp, "encryption"))
366 			goto out;
367 	if (is_dp_mst_hdcp(hdcp))
368 		if (!mod_hdcp_execute_and_set(
369 				mod_hdcp_hdcp1_enable_dp_stream_encryption,
370 				&input->stream_encryption_dp, &status,
371 				hdcp, "stream_encryption_dp"))
372 			goto out;
373 out:
374 	return status;
375 }
376 
377 static enum mod_hdcp_status determine_rx_hdcp_capable_dp(struct mod_hdcp *hdcp,
378 		struct mod_hdcp_event_context *event_ctx,
379 		struct mod_hdcp_transition_input_hdcp1 *input)
380 {
381 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
382 
383 	if (event_ctx->event != MOD_HDCP_EVENT_CALLBACK) {
384 		event_ctx->unexpected_event = 1;
385 		goto out;
386 	}
387 
388 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_bcaps,
389 			&input->bcaps_read, &status,
390 			hdcp, "bcaps_read"))
391 		goto out;
392 	if (!mod_hdcp_execute_and_set(check_hdcp_capable_dp,
393 			&input->hdcp_capable_dp, &status,
394 			hdcp, "hdcp_capable_dp"))
395 		goto out;
396 out:
397 	return status;
398 }
399 
400 static enum mod_hdcp_status wait_for_r0_prime_dp(struct mod_hdcp *hdcp,
401 		struct mod_hdcp_event_context *event_ctx,
402 		struct mod_hdcp_transition_input_hdcp1 *input)
403 {
404 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
405 
406 	if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ &&
407 			event_ctx->event != MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
408 		event_ctx->unexpected_event = 1;
409 		goto out;
410 	}
411 
412 	if (!mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
413 			&input->bstatus_read, &status,
414 			hdcp, "bstatus_read"))
415 		goto out;
416 	if (!mod_hdcp_execute_and_set(check_r0p_available_dp,
417 			&input->r0p_available_dp, &status,
418 			hdcp, "r0p_available_dp"))
419 		goto out;
420 out:
421 	return status;
422 }
423 
424 static enum mod_hdcp_status authenticated_dp(struct mod_hdcp *hdcp,
425 		struct mod_hdcp_event_context *event_ctx,
426 		struct mod_hdcp_transition_input_hdcp1 *input)
427 {
428 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
429 
430 	if (event_ctx->event != MOD_HDCP_EVENT_CPIRQ) {
431 		event_ctx->unexpected_event = 1;
432 		goto out;
433 	}
434 
435 	if (status == MOD_HDCP_STATUS_SUCCESS)
436 		mod_hdcp_execute_and_set(mod_hdcp_read_bstatus,
437 				&input->bstatus_read, &status,
438 				hdcp, "bstatus_read");
439 	if (status == MOD_HDCP_STATUS_SUCCESS)
440 		mod_hdcp_execute_and_set(check_link_integrity_dp,
441 				&input->link_integrity_check, &status,
442 				hdcp, "link_integrity_check");
443 	if (status == MOD_HDCP_STATUS_SUCCESS)
444 		mod_hdcp_execute_and_set(check_no_reauthentication_request_dp,
445 				&input->reauth_request_check, &status,
446 				hdcp, "reauth_request_check");
447 out:
448 	return status;
449 }
450 
451 uint8_t mod_hdcp_execute_and_set(
452 		mod_hdcp_action func, uint8_t *flag,
453 		enum mod_hdcp_status *status, struct mod_hdcp *hdcp, char *str)
454 {
455 	*status = func(hdcp);
456 	if (*status == MOD_HDCP_STATUS_SUCCESS && *flag != PASS) {
457 		HDCP_INPUT_PASS_TRACE(hdcp, str);
458 		*flag = PASS;
459 	} else if (*status != MOD_HDCP_STATUS_SUCCESS && *flag != FAIL) {
460 		HDCP_INPUT_FAIL_TRACE(hdcp, str);
461 		*flag = FAIL;
462 	}
463 	return (*status == MOD_HDCP_STATUS_SUCCESS);
464 }
465 
466 enum mod_hdcp_status mod_hdcp_hdcp1_execution(struct mod_hdcp *hdcp,
467 		struct mod_hdcp_event_context *event_ctx,
468 		struct mod_hdcp_transition_input_hdcp1 *input)
469 {
470 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
471 
472 	switch (current_state(hdcp)) {
473 	case H1_A0_WAIT_FOR_ACTIVE_RX:
474 		status = wait_for_active_rx(hdcp, event_ctx, input);
475 		break;
476 	case H1_A1_EXCHANGE_KSVS:
477 		status = exchange_ksvs(hdcp, event_ctx, input);
478 		break;
479 	case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER:
480 		status = computations_validate_rx_test_for_repeater(hdcp,
481 				event_ctx, input);
482 		break;
483 	case H1_A45_AUTHENTICATED:
484 		status = authenticated(hdcp, event_ctx, input);
485 		break;
486 	case H1_A8_WAIT_FOR_READY:
487 		status = wait_for_ready(hdcp, event_ctx, input);
488 		break;
489 	case H1_A9_READ_KSV_LIST:
490 		status = read_ksv_list(hdcp, event_ctx, input);
491 		break;
492 	default:
493 		status = MOD_HDCP_STATUS_INVALID_STATE;
494 		break;
495 	}
496 
497 	return status;
498 }
499 
500 extern enum mod_hdcp_status mod_hdcp_hdcp1_dp_execution(struct mod_hdcp *hdcp,
501 		struct mod_hdcp_event_context *event_ctx,
502 		struct mod_hdcp_transition_input_hdcp1 *input)
503 {
504 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
505 
506 	switch (current_state(hdcp)) {
507 	case D1_A0_DETERMINE_RX_HDCP_CAPABLE:
508 		status = determine_rx_hdcp_capable_dp(hdcp, event_ctx, input);
509 		break;
510 	case D1_A1_EXCHANGE_KSVS:
511 		status = exchange_ksvs(hdcp, event_ctx, input);
512 		break;
513 	case D1_A23_WAIT_FOR_R0_PRIME:
514 		status = wait_for_r0_prime_dp(hdcp, event_ctx, input);
515 		break;
516 	case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER:
517 		status = computations_validate_rx_test_for_repeater(
518 				hdcp, event_ctx, input);
519 		break;
520 	case D1_A4_AUTHENTICATED:
521 		status = authenticated_dp(hdcp, event_ctx, input);
522 		break;
523 	case D1_A6_WAIT_FOR_READY:
524 		status = wait_for_ready(hdcp, event_ctx, input);
525 		break;
526 	case D1_A7_READ_KSV_LIST:
527 		status = read_ksv_list(hdcp, event_ctx, input);
528 		break;
529 	default:
530 		status = MOD_HDCP_STATUS_INVALID_STATE;
531 		break;
532 	}
533 
534 	return status;
535 }
536