1/*
2 * Copyright (C) 2012 Avionic Design GmbH
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, sub license,
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 (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24#include <drm/display/drm_dp.h>
25#include <linux/bitops.h>
26#include <linux/bug.h>
27#include <linux/errno.h>
28#include <linux/export.h>
29#include <linux/hdmi.h>
30#include <linux/string.h>
31#include <linux/device.h>
32
33#define hdmi_log(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
34
35static u8 hdmi_infoframe_checksum(const u8 *ptr, size_t size)
36{
37 u8 csum = 0;
38 size_t i;
39
40 /* compute checksum */
41 for (i = 0; i < size; i++)
42 csum += ptr[i];
43
44 return 256 - csum;
45}
46
47static void hdmi_infoframe_set_checksum(void *buffer, size_t size)
48{
49 u8 *ptr = buffer;
50
51 ptr[3] = hdmi_infoframe_checksum(ptr: buffer, size);
52}
53
54/**
55 * hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
56 * @frame: HDMI AVI infoframe
57 */
58void hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
59{
60 memset(s: frame, c: 0, n: sizeof(*frame));
61
62 frame->type = HDMI_INFOFRAME_TYPE_AVI;
63 frame->version = 2;
64 frame->length = HDMI_AVI_INFOFRAME_SIZE;
65}
66EXPORT_SYMBOL(hdmi_avi_infoframe_init);
67
68static int hdmi_avi_infoframe_check_only(const struct hdmi_avi_infoframe *frame)
69{
70 if (frame->type != HDMI_INFOFRAME_TYPE_AVI ||
71 frame->version != 2 ||
72 frame->length != HDMI_AVI_INFOFRAME_SIZE)
73 return -EINVAL;
74
75 if (frame->picture_aspect > HDMI_PICTURE_ASPECT_16_9)
76 return -EINVAL;
77
78 return 0;
79}
80
81/**
82 * hdmi_avi_infoframe_check() - check a HDMI AVI infoframe
83 * @frame: HDMI AVI infoframe
84 *
85 * Validates that the infoframe is consistent and updates derived fields
86 * (eg. length) based on other fields.
87 *
88 * Returns 0 on success or a negative error code on failure.
89 */
90int hdmi_avi_infoframe_check(struct hdmi_avi_infoframe *frame)
91{
92 return hdmi_avi_infoframe_check_only(frame);
93}
94EXPORT_SYMBOL(hdmi_avi_infoframe_check);
95
96/**
97 * hdmi_avi_infoframe_pack_only() - write HDMI AVI infoframe to binary buffer
98 * @frame: HDMI AVI infoframe
99 * @buffer: destination buffer
100 * @size: size of buffer
101 *
102 * Packs the information contained in the @frame structure into a binary
103 * representation that can be written into the corresponding controller
104 * registers. Also computes the checksum as required by section 5.3.5 of
105 * the HDMI 1.4 specification.
106 *
107 * Returns the number of bytes packed into the binary buffer or a negative
108 * error code on failure.
109 */
110ssize_t hdmi_avi_infoframe_pack_only(const struct hdmi_avi_infoframe *frame,
111 void *buffer, size_t size)
112{
113 u8 *ptr = buffer;
114 size_t length;
115 int ret;
116
117 ret = hdmi_avi_infoframe_check_only(frame);
118 if (ret)
119 return ret;
120
121 length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
122
123 if (size < length)
124 return -ENOSPC;
125
126 memset(s: buffer, c: 0, n: size);
127
128 ptr[0] = frame->type;
129 ptr[1] = frame->version;
130 ptr[2] = frame->length;
131 ptr[3] = 0; /* checksum */
132
133 /* start infoframe payload */
134 ptr += HDMI_INFOFRAME_HEADER_SIZE;
135
136 ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);
137
138 /*
139 * Data byte 1, bit 4 has to be set if we provide the active format
140 * aspect ratio
141 */
142 if (frame->active_aspect & 0xf)
143 ptr[0] |= BIT(4);
144
145 /* Bit 3 and 2 indicate if we transmit horizontal/vertical bar data */
146 if (frame->top_bar || frame->bottom_bar)
147 ptr[0] |= BIT(3);
148
149 if (frame->left_bar || frame->right_bar)
150 ptr[0] |= BIT(2);
151
152 ptr[1] = ((frame->colorimetry & 0x3) << 6) |
153 ((frame->picture_aspect & 0x3) << 4) |
154 (frame->active_aspect & 0xf);
155
156 ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) |
157 ((frame->quantization_range & 0x3) << 2) |
158 (frame->nups & 0x3);
159
160 if (frame->itc)
161 ptr[2] |= BIT(7);
162
163 ptr[3] = frame->video_code & 0x7f;
164
165 ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) |
166 ((frame->content_type & 0x3) << 4) |
167 (frame->pixel_repeat & 0xf);
168
169 ptr[5] = frame->top_bar & 0xff;
170 ptr[6] = (frame->top_bar >> 8) & 0xff;
171 ptr[7] = frame->bottom_bar & 0xff;
172 ptr[8] = (frame->bottom_bar >> 8) & 0xff;
173 ptr[9] = frame->left_bar & 0xff;
174 ptr[10] = (frame->left_bar >> 8) & 0xff;
175 ptr[11] = frame->right_bar & 0xff;
176 ptr[12] = (frame->right_bar >> 8) & 0xff;
177
178 hdmi_infoframe_set_checksum(buffer, size: length);
179
180 return length;
181}
182EXPORT_SYMBOL(hdmi_avi_infoframe_pack_only);
183
184/**
185 * hdmi_avi_infoframe_pack() - check a HDMI AVI infoframe,
186 * and write it to binary buffer
187 * @frame: HDMI AVI infoframe
188 * @buffer: destination buffer
189 * @size: size of buffer
190 *
191 * Validates that the infoframe is consistent and updates derived fields
192 * (eg. length) based on other fields, after which it packs the information
193 * contained in the @frame structure into a binary representation that
194 * can be written into the corresponding controller registers. This function
195 * also computes the checksum as required by section 5.3.5 of the HDMI 1.4
196 * specification.
197 *
198 * Returns the number of bytes packed into the binary buffer or a negative
199 * error code on failure.
200 */
201ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame,
202 void *buffer, size_t size)
203{
204 int ret;
205
206 ret = hdmi_avi_infoframe_check(frame);
207 if (ret)
208 return ret;
209
210 return hdmi_avi_infoframe_pack_only(frame, buffer, size);
211}
212EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
213
214/**
215 * hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
216 * @frame: HDMI SPD infoframe
217 * @vendor: vendor string
218 * @product: product string
219 *
220 * Returns 0 on success or a negative error code on failure.
221 */
222int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
223 const char *vendor, const char *product)
224{
225 size_t len;
226
227 memset(s: frame, c: 0, n: sizeof(*frame));
228
229 frame->type = HDMI_INFOFRAME_TYPE_SPD;
230 frame->version = 1;
231 frame->length = HDMI_SPD_INFOFRAME_SIZE;
232
233 len = strlen(vendor);
234 memcpy(to: frame->vendor, from: vendor, min(len, sizeof(frame->vendor)));
235 len = strlen(product);
236 memcpy(to: frame->product, from: product, min(len, sizeof(frame->product)));
237
238 return 0;
239}
240EXPORT_SYMBOL(hdmi_spd_infoframe_init);
241
242static int hdmi_spd_infoframe_check_only(const struct hdmi_spd_infoframe *frame)
243{
244 if (frame->type != HDMI_INFOFRAME_TYPE_SPD ||
245 frame->version != 1 ||
246 frame->length != HDMI_SPD_INFOFRAME_SIZE)
247 return -EINVAL;
248
249 return 0;
250}
251
252/**
253 * hdmi_spd_infoframe_check() - check a HDMI SPD infoframe
254 * @frame: HDMI SPD infoframe
255 *
256 * Validates that the infoframe is consistent and updates derived fields
257 * (eg. length) based on other fields.
258 *
259 * Returns 0 on success or a negative error code on failure.
260 */
261int hdmi_spd_infoframe_check(struct hdmi_spd_infoframe *frame)
262{
263 return hdmi_spd_infoframe_check_only(frame);
264}
265EXPORT_SYMBOL(hdmi_spd_infoframe_check);
266
267/**
268 * hdmi_spd_infoframe_pack_only() - write HDMI SPD infoframe to binary buffer
269 * @frame: HDMI SPD infoframe
270 * @buffer: destination buffer
271 * @size: size of buffer
272 *
273 * Packs the information contained in the @frame structure into a binary
274 * representation that can be written into the corresponding controller
275 * registers. Also computes the checksum as required by section 5.3.5 of
276 * the HDMI 1.4 specification.
277 *
278 * Returns the number of bytes packed into the binary buffer or a negative
279 * error code on failure.
280 */
281ssize_t hdmi_spd_infoframe_pack_only(const struct hdmi_spd_infoframe *frame,
282 void *buffer, size_t size)
283{
284 u8 *ptr = buffer;
285 size_t length;
286 int ret;
287
288 ret = hdmi_spd_infoframe_check_only(frame);
289 if (ret)
290 return ret;
291
292 length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
293
294 if (size < length)
295 return -ENOSPC;
296
297 memset(s: buffer, c: 0, n: size);
298
299 ptr[0] = frame->type;
300 ptr[1] = frame->version;
301 ptr[2] = frame->length;
302 ptr[3] = 0; /* checksum */
303
304 /* start infoframe payload */
305 ptr += HDMI_INFOFRAME_HEADER_SIZE;
306
307 memcpy(to: ptr, from: frame->vendor, len: sizeof(frame->vendor));
308 memcpy(to: ptr + 8, from: frame->product, len: sizeof(frame->product));
309
310 ptr[24] = frame->sdi;
311
312 hdmi_infoframe_set_checksum(buffer, size: length);
313
314 return length;
315}
316EXPORT_SYMBOL(hdmi_spd_infoframe_pack_only);
317
318/**
319 * hdmi_spd_infoframe_pack() - check a HDMI SPD infoframe,
320 * and write it to binary buffer
321 * @frame: HDMI SPD infoframe
322 * @buffer: destination buffer
323 * @size: size of buffer
324 *
325 * Validates that the infoframe is consistent and updates derived fields
326 * (eg. length) based on other fields, after which it packs the information
327 * contained in the @frame structure into a binary representation that
328 * can be written into the corresponding controller registers. This function
329 * also computes the checksum as required by section 5.3.5 of the HDMI 1.4
330 * specification.
331 *
332 * Returns the number of bytes packed into the binary buffer or a negative
333 * error code on failure.
334 */
335ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame,
336 void *buffer, size_t size)
337{
338 int ret;
339
340 ret = hdmi_spd_infoframe_check(frame);
341 if (ret)
342 return ret;
343
344 return hdmi_spd_infoframe_pack_only(frame, buffer, size);
345}
346EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
347
348/**
349 * hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
350 * @frame: HDMI audio infoframe
351 *
352 * Returns 0 on success or a negative error code on failure.
353 */
354int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
355{
356 memset(s: frame, c: 0, n: sizeof(*frame));
357
358 frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
359 frame->version = 1;
360 frame->length = HDMI_AUDIO_INFOFRAME_SIZE;
361
362 return 0;
363}
364EXPORT_SYMBOL(hdmi_audio_infoframe_init);
365
366static int hdmi_audio_infoframe_check_only(const struct hdmi_audio_infoframe *frame)
367{
368 if (frame->type != HDMI_INFOFRAME_TYPE_AUDIO ||
369 frame->version != 1 ||
370 frame->length != HDMI_AUDIO_INFOFRAME_SIZE)
371 return -EINVAL;
372
373 return 0;
374}
375
376/**
377 * hdmi_audio_infoframe_check() - check a HDMI audio infoframe
378 * @frame: HDMI audio infoframe
379 *
380 * Validates that the infoframe is consistent and updates derived fields
381 * (eg. length) based on other fields.
382 *
383 * Returns 0 on success or a negative error code on failure.
384 */
385int hdmi_audio_infoframe_check(const struct hdmi_audio_infoframe *frame)
386{
387 return hdmi_audio_infoframe_check_only(frame);
388}
389EXPORT_SYMBOL(hdmi_audio_infoframe_check);
390
391static void
392hdmi_audio_infoframe_pack_payload(const struct hdmi_audio_infoframe *frame,
393 u8 *buffer)
394{
395 u8 channels;
396
397 if (frame->channels >= 2)
398 channels = frame->channels - 1;
399 else
400 channels = 0;
401
402 buffer[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
403 buffer[1] = ((frame->sample_frequency & 0x7) << 2) |
404 (frame->sample_size & 0x3);
405 buffer[2] = frame->coding_type_ext & 0x1f;
406 buffer[3] = frame->channel_allocation;
407 buffer[4] = (frame->level_shift_value & 0xf) << 3;
408
409 if (frame->downmix_inhibit)
410 buffer[4] |= BIT(7);
411}
412
413/**
414 * hdmi_audio_infoframe_pack_only() - write HDMI audio infoframe to binary buffer
415 * @frame: HDMI audio infoframe
416 * @buffer: destination buffer
417 * @size: size of buffer
418 *
419 * Packs the information contained in the @frame structure into a binary
420 * representation that can be written into the corresponding controller
421 * registers. Also computes the checksum as required by section 5.3.5 of
422 * the HDMI 1.4 specification.
423 *
424 * Returns the number of bytes packed into the binary buffer or a negative
425 * error code on failure.
426 */
427ssize_t hdmi_audio_infoframe_pack_only(const struct hdmi_audio_infoframe *frame,
428 void *buffer, size_t size)
429{
430 u8 *ptr = buffer;
431 size_t length;
432 int ret;
433
434 ret = hdmi_audio_infoframe_check_only(frame);
435 if (ret)
436 return ret;
437
438 length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
439
440 if (size < length)
441 return -ENOSPC;
442
443 memset(s: buffer, c: 0, n: size);
444
445 ptr[0] = frame->type;
446 ptr[1] = frame->version;
447 ptr[2] = frame->length;
448 ptr[3] = 0; /* checksum */
449
450 hdmi_audio_infoframe_pack_payload(frame,
451 buffer: ptr + HDMI_INFOFRAME_HEADER_SIZE);
452
453 hdmi_infoframe_set_checksum(buffer, size: length);
454
455 return length;
456}
457EXPORT_SYMBOL(hdmi_audio_infoframe_pack_only);
458
459/**
460 * hdmi_audio_infoframe_pack() - check a HDMI Audio infoframe,
461 * and write it to binary buffer
462 * @frame: HDMI Audio infoframe
463 * @buffer: destination buffer
464 * @size: size of buffer
465 *
466 * Validates that the infoframe is consistent and updates derived fields
467 * (eg. length) based on other fields, after which it packs the information
468 * contained in the @frame structure into a binary representation that
469 * can be written into the corresponding controller registers. This function
470 * also computes the checksum as required by section 5.3.5 of the HDMI 1.4
471 * specification.
472 *
473 * Returns the number of bytes packed into the binary buffer or a negative
474 * error code on failure.
475 */
476ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
477 void *buffer, size_t size)
478{
479 int ret;
480
481 ret = hdmi_audio_infoframe_check(frame);
482 if (ret)
483 return ret;
484
485 return hdmi_audio_infoframe_pack_only(frame, buffer, size);
486}
487EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
488
489/**
490 * hdmi_audio_infoframe_pack_for_dp - Pack a HDMI Audio infoframe for DisplayPort
491 *
492 * @frame: HDMI Audio infoframe
493 * @sdp: Secondary data packet for DisplayPort.
494 * @dp_version: DisplayPort version to be encoded in the header
495 *
496 * Packs a HDMI Audio Infoframe to be sent over DisplayPort. This function
497 * fills the secondary data packet to be used for DisplayPort.
498 *
499 * Return: Number of total written bytes or a negative errno on failure.
500 */
501ssize_t
502hdmi_audio_infoframe_pack_for_dp(const struct hdmi_audio_infoframe *frame,
503 struct dp_sdp *sdp, u8 dp_version)
504{
505 int ret;
506
507 ret = hdmi_audio_infoframe_check(frame);
508 if (ret)
509 return ret;
510
511 memset(s: sdp->db, c: 0, n: sizeof(sdp->db));
512
513 /* Secondary-data packet header */
514 sdp->sdp_header.HB0 = 0;
515 sdp->sdp_header.HB1 = frame->type;
516 sdp->sdp_header.HB2 = DP_SDP_AUDIO_INFOFRAME_HB2;
517 sdp->sdp_header.HB3 = (dp_version & 0x3f) << 2;
518
519 hdmi_audio_infoframe_pack_payload(frame, buffer: sdp->db);
520
521 /* Return size = frame length + four HB for sdp_header */
522 return frame->length + 4;
523}
524EXPORT_SYMBOL(hdmi_audio_infoframe_pack_for_dp);
525
526/**
527 * hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe
528 * @frame: HDMI vendor infoframe
529 *
530 * Returns 0 on success or a negative error code on failure.
531 */
532int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
533{
534 memset(s: frame, c: 0, n: sizeof(*frame));
535
536 frame->type = HDMI_INFOFRAME_TYPE_VENDOR;
537 frame->version = 1;
538
539 frame->oui = HDMI_IEEE_OUI;
540
541 /*
542 * 0 is a valid value for s3d_struct, so we use a special "not set"
543 * value
544 */
545 frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
546 frame->length = HDMI_VENDOR_INFOFRAME_SIZE;
547
548 return 0;
549}
550EXPORT_SYMBOL(hdmi_vendor_infoframe_init);
551
552static int hdmi_vendor_infoframe_length(const struct hdmi_vendor_infoframe *frame)
553{
554 /* for side by side (half) we also need to provide 3D_Ext_Data */
555 if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
556 return 6;
557 else if (frame->vic != 0 || frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
558 return 5;
559 else
560 return 4;
561}
562
563static int hdmi_vendor_infoframe_check_only(const struct hdmi_vendor_infoframe *frame)
564{
565 if (frame->type != HDMI_INFOFRAME_TYPE_VENDOR ||
566 frame->version != 1 ||
567 frame->oui != HDMI_IEEE_OUI)
568 return -EINVAL;
569
570 /* only one of those can be supplied */
571 if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
572 return -EINVAL;
573
574 if (frame->length != hdmi_vendor_infoframe_length(frame))
575 return -EINVAL;
576
577 return 0;
578}
579
580/**
581 * hdmi_vendor_infoframe_check() - check a HDMI vendor infoframe
582 * @frame: HDMI infoframe
583 *
584 * Validates that the infoframe is consistent and updates derived fields
585 * (eg. length) based on other fields.
586 *
587 * Returns 0 on success or a negative error code on failure.
588 */
589int hdmi_vendor_infoframe_check(struct hdmi_vendor_infoframe *frame)
590{
591 frame->length = hdmi_vendor_infoframe_length(frame);
592
593 return hdmi_vendor_infoframe_check_only(frame);
594}
595EXPORT_SYMBOL(hdmi_vendor_infoframe_check);
596
597/**
598 * hdmi_vendor_infoframe_pack_only() - write a HDMI vendor infoframe to binary buffer
599 * @frame: HDMI infoframe
600 * @buffer: destination buffer
601 * @size: size of buffer
602 *
603 * Packs the information contained in the @frame structure into a binary
604 * representation that can be written into the corresponding controller
605 * registers. Also computes the checksum as required by section 5.3.5 of
606 * the HDMI 1.4 specification.
607 *
608 * Returns the number of bytes packed into the binary buffer or a negative
609 * error code on failure.
610 */
611ssize_t hdmi_vendor_infoframe_pack_only(const struct hdmi_vendor_infoframe *frame,
612 void *buffer, size_t size)
613{
614 u8 *ptr = buffer;
615 size_t length;
616 int ret;
617
618 ret = hdmi_vendor_infoframe_check_only(frame);
619 if (ret)
620 return ret;
621
622 length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
623
624 if (size < length)
625 return -ENOSPC;
626
627 memset(s: buffer, c: 0, n: size);
628
629 ptr[0] = frame->type;
630 ptr[1] = frame->version;
631 ptr[2] = frame->length;
632 ptr[3] = 0; /* checksum */
633
634 /* HDMI OUI */
635 ptr[4] = 0x03;
636 ptr[5] = 0x0c;
637 ptr[6] = 0x00;
638
639 if (frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
640 ptr[7] = 0x2 << 5; /* video format */
641 ptr[8] = (frame->s3d_struct & 0xf) << 4;
642 if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
643 ptr[9] = (frame->s3d_ext_data & 0xf) << 4;
644 } else if (frame->vic) {
645 ptr[7] = 0x1 << 5; /* video format */
646 ptr[8] = frame->vic;
647 } else {
648 ptr[7] = 0x0 << 5; /* video format */
649 }
650
651 hdmi_infoframe_set_checksum(buffer, size: length);
652
653 return length;
654}
655EXPORT_SYMBOL(hdmi_vendor_infoframe_pack_only);
656
657/**
658 * hdmi_vendor_infoframe_pack() - check a HDMI Vendor infoframe,
659 * and write it to binary buffer
660 * @frame: HDMI Vendor infoframe
661 * @buffer: destination buffer
662 * @size: size of buffer
663 *
664 * Validates that the infoframe is consistent and updates derived fields
665 * (eg. length) based on other fields, after which it packs the information
666 * contained in the @frame structure into a binary representation that
667 * can be written into the corresponding controller registers. This function
668 * also computes the checksum as required by section 5.3.5 of the HDMI 1.4
669 * specification.
670 *
671 * Returns the number of bytes packed into the binary buffer or a negative
672 * error code on failure.
673 */
674ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
675 void *buffer, size_t size)
676{
677 int ret;
678
679 ret = hdmi_vendor_infoframe_check(frame);
680 if (ret)
681 return ret;
682
683 return hdmi_vendor_infoframe_pack_only(frame, buffer, size);
684}
685EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
686
687static int
688hdmi_vendor_any_infoframe_check_only(const union hdmi_vendor_any_infoframe *frame)
689{
690 if (frame->any.type != HDMI_INFOFRAME_TYPE_VENDOR ||
691 frame->any.version != 1)
692 return -EINVAL;
693
694 return 0;
695}
696
697/**
698 * hdmi_drm_infoframe_init() - initialize an HDMI Dynaminc Range and
699 * mastering infoframe
700 * @frame: HDMI DRM infoframe
701 *
702 * Returns 0 on success or a negative error code on failure.
703 */
704int hdmi_drm_infoframe_init(struct hdmi_drm_infoframe *frame)
705{
706 memset(s: frame, c: 0, n: sizeof(*frame));
707
708 frame->type = HDMI_INFOFRAME_TYPE_DRM;
709 frame->version = 1;
710 frame->length = HDMI_DRM_INFOFRAME_SIZE;
711
712 return 0;
713}
714EXPORT_SYMBOL(hdmi_drm_infoframe_init);
715
716static int hdmi_drm_infoframe_check_only(const struct hdmi_drm_infoframe *frame)
717{
718 if (frame->type != HDMI_INFOFRAME_TYPE_DRM ||
719 frame->version != 1)
720 return -EINVAL;
721
722 if (frame->length != HDMI_DRM_INFOFRAME_SIZE)
723 return -EINVAL;
724
725 return 0;
726}
727
728/**
729 * hdmi_drm_infoframe_check() - check a HDMI DRM infoframe
730 * @frame: HDMI DRM infoframe
731 *
732 * Validates that the infoframe is consistent.
733 * Returns 0 on success or a negative error code on failure.
734 */
735int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame)
736{
737 return hdmi_drm_infoframe_check_only(frame);
738}
739EXPORT_SYMBOL(hdmi_drm_infoframe_check);
740
741/**
742 * hdmi_drm_infoframe_pack_only() - write HDMI DRM infoframe to binary buffer
743 * @frame: HDMI DRM infoframe
744 * @buffer: destination buffer
745 * @size: size of buffer
746 *
747 * Packs the information contained in the @frame structure into a binary
748 * representation that can be written into the corresponding controller
749 * registers. Also computes the checksum as required by section 5.3.5 of
750 * the HDMI 1.4 specification.
751 *
752 * Returns the number of bytes packed into the binary buffer or a negative
753 * error code on failure.
754 */
755ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame,
756 void *buffer, size_t size)
757{
758 u8 *ptr = buffer;
759 size_t length;
760 int i;
761
762 length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
763
764 if (size < length)
765 return -ENOSPC;
766
767 memset(s: buffer, c: 0, n: size);
768
769 ptr[0] = frame->type;
770 ptr[1] = frame->version;
771 ptr[2] = frame->length;
772 ptr[3] = 0; /* checksum */
773
774 /* start infoframe payload */
775 ptr += HDMI_INFOFRAME_HEADER_SIZE;
776
777 *ptr++ = frame->eotf;
778 *ptr++ = frame->metadata_type;
779
780 for (i = 0; i < 3; i++) {
781 *ptr++ = frame->display_primaries[i].x;
782 *ptr++ = frame->display_primaries[i].x >> 8;
783 *ptr++ = frame->display_primaries[i].y;
784 *ptr++ = frame->display_primaries[i].y >> 8;
785 }
786
787 *ptr++ = frame->white_point.x;
788 *ptr++ = frame->white_point.x >> 8;
789
790 *ptr++ = frame->white_point.y;
791 *ptr++ = frame->white_point.y >> 8;
792
793 *ptr++ = frame->max_display_mastering_luminance;
794 *ptr++ = frame->max_display_mastering_luminance >> 8;
795
796 *ptr++ = frame->min_display_mastering_luminance;
797 *ptr++ = frame->min_display_mastering_luminance >> 8;
798
799 *ptr++ = frame->max_cll;
800 *ptr++ = frame->max_cll >> 8;
801
802 *ptr++ = frame->max_fall;
803 *ptr++ = frame->max_fall >> 8;
804
805 hdmi_infoframe_set_checksum(buffer, size: length);
806
807 return length;
808}
809EXPORT_SYMBOL(hdmi_drm_infoframe_pack_only);
810
811/**
812 * hdmi_drm_infoframe_pack() - check a HDMI DRM infoframe,
813 * and write it to binary buffer
814 * @frame: HDMI DRM infoframe
815 * @buffer: destination buffer
816 * @size: size of buffer
817 *
818 * Validates that the infoframe is consistent and updates derived fields
819 * (eg. length) based on other fields, after which it packs the information
820 * contained in the @frame structure into a binary representation that
821 * can be written into the corresponding controller registers. This function
822 * also computes the checksum as required by section 5.3.5 of the HDMI 1.4
823 * specification.
824 *
825 * Returns the number of bytes packed into the binary buffer or a negative
826 * error code on failure.
827 */
828ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe *frame,
829 void *buffer, size_t size)
830{
831 int ret;
832
833 ret = hdmi_drm_infoframe_check(frame);
834 if (ret)
835 return ret;
836
837 return hdmi_drm_infoframe_pack_only(frame, buffer, size);
838}
839EXPORT_SYMBOL(hdmi_drm_infoframe_pack);
840
841/*
842 * hdmi_vendor_any_infoframe_check() - check a vendor infoframe
843 */
844static int
845hdmi_vendor_any_infoframe_check(union hdmi_vendor_any_infoframe *frame)
846{
847 int ret;
848
849 ret = hdmi_vendor_any_infoframe_check_only(frame);
850 if (ret)
851 return ret;
852
853 /* we only know about HDMI vendor infoframes */
854 if (frame->any.oui != HDMI_IEEE_OUI)
855 return -EINVAL;
856
857 return hdmi_vendor_infoframe_check(&frame->hdmi);
858}
859
860/*
861 * hdmi_vendor_any_infoframe_pack_only() - write a vendor infoframe to binary buffer
862 */
863static ssize_t
864hdmi_vendor_any_infoframe_pack_only(const union hdmi_vendor_any_infoframe *frame,
865 void *buffer, size_t size)
866{
867 int ret;
868
869 ret = hdmi_vendor_any_infoframe_check_only(frame);
870 if (ret)
871 return ret;
872
873 /* we only know about HDMI vendor infoframes */
874 if (frame->any.oui != HDMI_IEEE_OUI)
875 return -EINVAL;
876
877 return hdmi_vendor_infoframe_pack_only(&frame->hdmi, buffer, size);
878}
879
880/*
881 * hdmi_vendor_any_infoframe_pack() - check a vendor infoframe,
882 * and write it to binary buffer
883 */
884static ssize_t
885hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,
886 void *buffer, size_t size)
887{
888 int ret;
889
890 ret = hdmi_vendor_any_infoframe_check(frame);
891 if (ret)
892 return ret;
893
894 return hdmi_vendor_any_infoframe_pack_only(frame, buffer, size);
895}
896
897/**
898 * hdmi_infoframe_pack_only() - write a HDMI infoframe to binary buffer
899 * @frame: HDMI infoframe
900 * @buffer: destination buffer
901 * @size: size of buffer
902 *
903 * Packs the information contained in the @frame structure into a binary
904 * representation that can be written into the corresponding controller
905 * registers. Also computes the checksum as required by section 5.3.5 of
906 * the HDMI 1.4 specification.
907 *
908 * Returns the number of bytes packed into the binary buffer or a negative
909 * error code on failure.
910 */
911ssize_t
912hdmi_infoframe_pack_only(const union hdmi_infoframe *frame, void *buffer, size_t size)
913{
914 ssize_t length;
915
916 switch (frame->any.type) {
917 case HDMI_INFOFRAME_TYPE_AVI:
918 length = hdmi_avi_infoframe_pack_only(&frame->avi,
919 buffer, size);
920 break;
921 case HDMI_INFOFRAME_TYPE_DRM:
922 length = hdmi_drm_infoframe_pack_only(&frame->drm,
923 buffer, size);
924 break;
925 case HDMI_INFOFRAME_TYPE_SPD:
926 length = hdmi_spd_infoframe_pack_only(&frame->spd,
927 buffer, size);
928 break;
929 case HDMI_INFOFRAME_TYPE_AUDIO:
930 length = hdmi_audio_infoframe_pack_only(&frame->audio,
931 buffer, size);
932 break;
933 case HDMI_INFOFRAME_TYPE_VENDOR:
934 length = hdmi_vendor_any_infoframe_pack_only(frame: &frame->vendor,
935 buffer, size);
936 break;
937 default:
938 WARN(1, "Bad infoframe type %d\n", frame->any.type);
939 length = -EINVAL;
940 }
941
942 return length;
943}
944EXPORT_SYMBOL(hdmi_infoframe_pack_only);
945
946/**
947 * hdmi_infoframe_pack() - check a HDMI infoframe,
948 * and write it to binary buffer
949 * @frame: HDMI infoframe
950 * @buffer: destination buffer
951 * @size: size of buffer
952 *
953 * Validates that the infoframe is consistent and updates derived fields
954 * (eg. length) based on other fields, after which it packs the information
955 * contained in the @frame structure into a binary representation that
956 * can be written into the corresponding controller registers. This function
957 * also computes the checksum as required by section 5.3.5 of the HDMI 1.4
958 * specification.
959 *
960 * Returns the number of bytes packed into the binary buffer or a negative
961 * error code on failure.
962 */
963ssize_t
964hdmi_infoframe_pack(union hdmi_infoframe *frame,
965 void *buffer, size_t size)
966{
967 ssize_t length;
968
969 switch (frame->any.type) {
970 case HDMI_INFOFRAME_TYPE_AVI:
971 length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
972 break;
973 case HDMI_INFOFRAME_TYPE_DRM:
974 length = hdmi_drm_infoframe_pack(&frame->drm, buffer, size);
975 break;
976 case HDMI_INFOFRAME_TYPE_SPD:
977 length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
978 break;
979 case HDMI_INFOFRAME_TYPE_AUDIO:
980 length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
981 break;
982 case HDMI_INFOFRAME_TYPE_VENDOR:
983 length = hdmi_vendor_any_infoframe_pack(frame: &frame->vendor,
984 buffer, size);
985 break;
986 default:
987 WARN(1, "Bad infoframe type %d\n", frame->any.type);
988 length = -EINVAL;
989 }
990
991 return length;
992}
993EXPORT_SYMBOL(hdmi_infoframe_pack);
994
995static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type)
996{
997 if (type < 0x80 || type > 0x9f)
998 return "Invalid";
999 switch (type) {
1000 case HDMI_INFOFRAME_TYPE_VENDOR:
1001 return "Vendor";
1002 case HDMI_INFOFRAME_TYPE_AVI:
1003 return "Auxiliary Video Information (AVI)";
1004 case HDMI_INFOFRAME_TYPE_SPD:
1005 return "Source Product Description (SPD)";
1006 case HDMI_INFOFRAME_TYPE_AUDIO:
1007 return "Audio";
1008 case HDMI_INFOFRAME_TYPE_DRM:
1009 return "Dynamic Range and Mastering";
1010 }
1011 return "Reserved";
1012}
1013
1014static void hdmi_infoframe_log_header(const char *level,
1015 struct device *dev,
1016 const struct hdmi_any_infoframe *frame)
1017{
1018 hdmi_log("HDMI infoframe: %s, version %u, length %u\n",
1019 hdmi_infoframe_type_get_name(frame->type),
1020 frame->version, frame->length);
1021}
1022
1023static const char *hdmi_colorspace_get_name(enum hdmi_colorspace colorspace)
1024{
1025 switch (colorspace) {
1026 case HDMI_COLORSPACE_RGB:
1027 return "RGB";
1028 case HDMI_COLORSPACE_YUV422:
1029 return "YCbCr 4:2:2";
1030 case HDMI_COLORSPACE_YUV444:
1031 return "YCbCr 4:4:4";
1032 case HDMI_COLORSPACE_YUV420:
1033 return "YCbCr 4:2:0";
1034 case HDMI_COLORSPACE_RESERVED4:
1035 return "Reserved (4)";
1036 case HDMI_COLORSPACE_RESERVED5:
1037 return "Reserved (5)";
1038 case HDMI_COLORSPACE_RESERVED6:
1039 return "Reserved (6)";
1040 case HDMI_COLORSPACE_IDO_DEFINED:
1041 return "IDO Defined";
1042 }
1043 return "Invalid";
1044}
1045
1046static const char *hdmi_scan_mode_get_name(enum hdmi_scan_mode scan_mode)
1047{
1048 switch (scan_mode) {
1049 case HDMI_SCAN_MODE_NONE:
1050 return "No Data";
1051 case HDMI_SCAN_MODE_OVERSCAN:
1052 return "Overscan";
1053 case HDMI_SCAN_MODE_UNDERSCAN:
1054 return "Underscan";
1055 case HDMI_SCAN_MODE_RESERVED:
1056 return "Reserved";
1057 }
1058 return "Invalid";
1059}
1060
1061static const char *hdmi_colorimetry_get_name(enum hdmi_colorimetry colorimetry)
1062{
1063 switch (colorimetry) {
1064 case HDMI_COLORIMETRY_NONE:
1065 return "No Data";
1066 case HDMI_COLORIMETRY_ITU_601:
1067 return "ITU601";
1068 case HDMI_COLORIMETRY_ITU_709:
1069 return "ITU709";
1070 case HDMI_COLORIMETRY_EXTENDED:
1071 return "Extended";
1072 }
1073 return "Invalid";
1074}
1075
1076static const char *
1077hdmi_picture_aspect_get_name(enum hdmi_picture_aspect picture_aspect)
1078{
1079 switch (picture_aspect) {
1080 case HDMI_PICTURE_ASPECT_NONE:
1081 return "No Data";
1082 case HDMI_PICTURE_ASPECT_4_3:
1083 return "4:3";
1084 case HDMI_PICTURE_ASPECT_16_9:
1085 return "16:9";
1086 case HDMI_PICTURE_ASPECT_64_27:
1087 return "64:27";
1088 case HDMI_PICTURE_ASPECT_256_135:
1089 return "256:135";
1090 case HDMI_PICTURE_ASPECT_RESERVED:
1091 return "Reserved";
1092 }
1093 return "Invalid";
1094}
1095
1096static const char *
1097hdmi_active_aspect_get_name(enum hdmi_active_aspect active_aspect)
1098{
1099 if (active_aspect < 0 || active_aspect > 0xf)
1100 return "Invalid";
1101
1102 switch (active_aspect) {
1103 case HDMI_ACTIVE_ASPECT_16_9_TOP:
1104 return "16:9 Top";
1105 case HDMI_ACTIVE_ASPECT_14_9_TOP:
1106 return "14:9 Top";
1107 case HDMI_ACTIVE_ASPECT_16_9_CENTER:
1108 return "16:9 Center";
1109 case HDMI_ACTIVE_ASPECT_PICTURE:
1110 return "Same as Picture";
1111 case HDMI_ACTIVE_ASPECT_4_3:
1112 return "4:3";
1113 case HDMI_ACTIVE_ASPECT_16_9:
1114 return "16:9";
1115 case HDMI_ACTIVE_ASPECT_14_9:
1116 return "14:9";
1117 case HDMI_ACTIVE_ASPECT_4_3_SP_14_9:
1118 return "4:3 SP 14:9";
1119 case HDMI_ACTIVE_ASPECT_16_9_SP_14_9:
1120 return "16:9 SP 14:9";
1121 case HDMI_ACTIVE_ASPECT_16_9_SP_4_3:
1122 return "16:9 SP 4:3";
1123 }
1124 return "Reserved";
1125}
1126
1127static const char *
1128hdmi_extended_colorimetry_get_name(enum hdmi_extended_colorimetry ext_col)
1129{
1130 switch (ext_col) {
1131 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
1132 return "xvYCC 601";
1133 case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
1134 return "xvYCC 709";
1135 case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
1136 return "sYCC 601";
1137 case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
1138 return "opYCC 601";
1139 case HDMI_EXTENDED_COLORIMETRY_OPRGB:
1140 return "opRGB";
1141 case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
1142 return "BT.2020 Constant Luminance";
1143 case HDMI_EXTENDED_COLORIMETRY_BT2020:
1144 return "BT.2020";
1145 case HDMI_EXTENDED_COLORIMETRY_RESERVED:
1146 return "Reserved";
1147 }
1148 return "Invalid";
1149}
1150
1151static const char *
1152hdmi_quantization_range_get_name(enum hdmi_quantization_range qrange)
1153{
1154 switch (qrange) {
1155 case HDMI_QUANTIZATION_RANGE_DEFAULT:
1156 return "Default";
1157 case HDMI_QUANTIZATION_RANGE_LIMITED:
1158 return "Limited";
1159 case HDMI_QUANTIZATION_RANGE_FULL:
1160 return "Full";
1161 case HDMI_QUANTIZATION_RANGE_RESERVED:
1162 return "Reserved";
1163 }
1164 return "Invalid";
1165}
1166
1167static const char *hdmi_nups_get_name(enum hdmi_nups nups)
1168{
1169 switch (nups) {
1170 case HDMI_NUPS_UNKNOWN:
1171 return "Unknown Non-uniform Scaling";
1172 case HDMI_NUPS_HORIZONTAL:
1173 return "Horizontally Scaled";
1174 case HDMI_NUPS_VERTICAL:
1175 return "Vertically Scaled";
1176 case HDMI_NUPS_BOTH:
1177 return "Horizontally and Vertically Scaled";
1178 }
1179 return "Invalid";
1180}
1181
1182static const char *
1183hdmi_ycc_quantization_range_get_name(enum hdmi_ycc_quantization_range qrange)
1184{
1185 switch (qrange) {
1186 case HDMI_YCC_QUANTIZATION_RANGE_LIMITED:
1187 return "Limited";
1188 case HDMI_YCC_QUANTIZATION_RANGE_FULL:
1189 return "Full";
1190 }
1191 return "Invalid";
1192}
1193
1194static const char *
1195hdmi_content_type_get_name(enum hdmi_content_type content_type)
1196{
1197 switch (content_type) {
1198 case HDMI_CONTENT_TYPE_GRAPHICS:
1199 return "Graphics";
1200 case HDMI_CONTENT_TYPE_PHOTO:
1201 return "Photo";
1202 case HDMI_CONTENT_TYPE_CINEMA:
1203 return "Cinema";
1204 case HDMI_CONTENT_TYPE_GAME:
1205 return "Game";
1206 }
1207 return "Invalid";
1208}
1209
1210static void hdmi_avi_infoframe_log(const char *level,
1211 struct device *dev,
1212 const struct hdmi_avi_infoframe *frame)
1213{
1214 hdmi_infoframe_log_header(level, dev,
1215 frame: (const struct hdmi_any_infoframe *)frame);
1216
1217 hdmi_log(" colorspace: %s\n",
1218 hdmi_colorspace_get_name(frame->colorspace));
1219 hdmi_log(" scan mode: %s\n",
1220 hdmi_scan_mode_get_name(frame->scan_mode));
1221 hdmi_log(" colorimetry: %s\n",
1222 hdmi_colorimetry_get_name(frame->colorimetry));
1223 hdmi_log(" picture aspect: %s\n",
1224 hdmi_picture_aspect_get_name(frame->picture_aspect));
1225 hdmi_log(" active aspect: %s\n",
1226 hdmi_active_aspect_get_name(frame->active_aspect));
1227 hdmi_log(" itc: %s\n", frame->itc ? "IT Content" : "No Data");
1228 hdmi_log(" extended colorimetry: %s\n",
1229 hdmi_extended_colorimetry_get_name(frame->extended_colorimetry));
1230 hdmi_log(" quantization range: %s\n",
1231 hdmi_quantization_range_get_name(frame->quantization_range));
1232 hdmi_log(" nups: %s\n", hdmi_nups_get_name(frame->nups));
1233 hdmi_log(" video code: %u\n", frame->video_code);
1234 hdmi_log(" ycc quantization range: %s\n",
1235 hdmi_ycc_quantization_range_get_name(frame->ycc_quantization_range));
1236 hdmi_log(" hdmi content type: %s\n",
1237 hdmi_content_type_get_name(frame->content_type));
1238 hdmi_log(" pixel repeat: %u\n", frame->pixel_repeat);
1239 hdmi_log(" bar top %u, bottom %u, left %u, right %u\n",
1240 frame->top_bar, frame->bottom_bar,
1241 frame->left_bar, frame->right_bar);
1242}
1243
1244static const char *hdmi_spd_sdi_get_name(enum hdmi_spd_sdi sdi)
1245{
1246 if (sdi < 0 || sdi > 0xff)
1247 return "Invalid";
1248 switch (sdi) {
1249 case HDMI_SPD_SDI_UNKNOWN:
1250 return "Unknown";
1251 case HDMI_SPD_SDI_DSTB:
1252 return "Digital STB";
1253 case HDMI_SPD_SDI_DVDP:
1254 return "DVD Player";
1255 case HDMI_SPD_SDI_DVHS:
1256 return "D-VHS";
1257 case HDMI_SPD_SDI_HDDVR:
1258 return "HDD Videorecorder";
1259 case HDMI_SPD_SDI_DVC:
1260 return "DVC";
1261 case HDMI_SPD_SDI_DSC:
1262 return "DSC";
1263 case HDMI_SPD_SDI_VCD:
1264 return "Video CD";
1265 case HDMI_SPD_SDI_GAME:
1266 return "Game";
1267 case HDMI_SPD_SDI_PC:
1268 return "PC General";
1269 case HDMI_SPD_SDI_BD:
1270 return "Blu-Ray Disc (BD)";
1271 case HDMI_SPD_SDI_SACD:
1272 return "Super Audio CD";
1273 case HDMI_SPD_SDI_HDDVD:
1274 return "HD DVD";
1275 case HDMI_SPD_SDI_PMP:
1276 return "PMP";
1277 }
1278 return "Reserved";
1279}
1280
1281static void hdmi_spd_infoframe_log(const char *level,
1282 struct device *dev,
1283 const struct hdmi_spd_infoframe *frame)
1284{
1285 hdmi_infoframe_log_header(level, dev,
1286 frame: (const struct hdmi_any_infoframe *)frame);
1287
1288 hdmi_log(" vendor: %.8s\n", frame->vendor);
1289 hdmi_log(" product: %.16s\n", frame->product);
1290 hdmi_log(" source device information: %s (0x%x)\n",
1291 hdmi_spd_sdi_get_name(frame->sdi), frame->sdi);
1292}
1293
1294static const char *
1295hdmi_audio_coding_type_get_name(enum hdmi_audio_coding_type coding_type)
1296{
1297 switch (coding_type) {
1298 case HDMI_AUDIO_CODING_TYPE_STREAM:
1299 return "Refer to Stream Header";
1300 case HDMI_AUDIO_CODING_TYPE_PCM:
1301 return "PCM";
1302 case HDMI_AUDIO_CODING_TYPE_AC3:
1303 return "AC-3";
1304 case HDMI_AUDIO_CODING_TYPE_MPEG1:
1305 return "MPEG1";
1306 case HDMI_AUDIO_CODING_TYPE_MP3:
1307 return "MP3";
1308 case HDMI_AUDIO_CODING_TYPE_MPEG2:
1309 return "MPEG2";
1310 case HDMI_AUDIO_CODING_TYPE_AAC_LC:
1311 return "AAC";
1312 case HDMI_AUDIO_CODING_TYPE_DTS:
1313 return "DTS";
1314 case HDMI_AUDIO_CODING_TYPE_ATRAC:
1315 return "ATRAC";
1316 case HDMI_AUDIO_CODING_TYPE_DSD:
1317 return "One Bit Audio";
1318 case HDMI_AUDIO_CODING_TYPE_EAC3:
1319 return "Dolby Digital +";
1320 case HDMI_AUDIO_CODING_TYPE_DTS_HD:
1321 return "DTS-HD";
1322 case HDMI_AUDIO_CODING_TYPE_MLP:
1323 return "MAT (MLP)";
1324 case HDMI_AUDIO_CODING_TYPE_DST:
1325 return "DST";
1326 case HDMI_AUDIO_CODING_TYPE_WMA_PRO:
1327 return "WMA PRO";
1328 case HDMI_AUDIO_CODING_TYPE_CXT:
1329 return "Refer to CXT";
1330 }
1331 return "Invalid";
1332}
1333
1334static const char *
1335hdmi_audio_sample_size_get_name(enum hdmi_audio_sample_size sample_size)
1336{
1337 switch (sample_size) {
1338 case HDMI_AUDIO_SAMPLE_SIZE_STREAM:
1339 return "Refer to Stream Header";
1340 case HDMI_AUDIO_SAMPLE_SIZE_16:
1341 return "16 bit";
1342 case HDMI_AUDIO_SAMPLE_SIZE_20:
1343 return "20 bit";
1344 case HDMI_AUDIO_SAMPLE_SIZE_24:
1345 return "24 bit";
1346 }
1347 return "Invalid";
1348}
1349
1350static const char *
1351hdmi_audio_sample_frequency_get_name(enum hdmi_audio_sample_frequency freq)
1352{
1353 switch (freq) {
1354 case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM:
1355 return "Refer to Stream Header";
1356 case HDMI_AUDIO_SAMPLE_FREQUENCY_32000:
1357 return "32 kHz";
1358 case HDMI_AUDIO_SAMPLE_FREQUENCY_44100:
1359 return "44.1 kHz (CD)";
1360 case HDMI_AUDIO_SAMPLE_FREQUENCY_48000:
1361 return "48 kHz";
1362 case HDMI_AUDIO_SAMPLE_FREQUENCY_88200:
1363 return "88.2 kHz";
1364 case HDMI_AUDIO_SAMPLE_FREQUENCY_96000:
1365 return "96 kHz";
1366 case HDMI_AUDIO_SAMPLE_FREQUENCY_176400:
1367 return "176.4 kHz";
1368 case HDMI_AUDIO_SAMPLE_FREQUENCY_192000:
1369 return "192 kHz";
1370 }
1371 return "Invalid";
1372}
1373
1374static const char *
1375hdmi_audio_coding_type_ext_get_name(enum hdmi_audio_coding_type_ext ctx)
1376{
1377 if (ctx < 0 || ctx > 0x1f)
1378 return "Invalid";
1379
1380 switch (ctx) {
1381 case HDMI_AUDIO_CODING_TYPE_EXT_CT:
1382 return "Refer to CT";
1383 case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC:
1384 return "HE AAC";
1385 case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2:
1386 return "HE AAC v2";
1387 case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND:
1388 return "MPEG SURROUND";
1389 case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC:
1390 return "MPEG-4 HE AAC";
1391 case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_V2:
1392 return "MPEG-4 HE AAC v2";
1393 case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC:
1394 return "MPEG-4 AAC LC";
1395 case HDMI_AUDIO_CODING_TYPE_EXT_DRA:
1396 return "DRA";
1397 case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_SURROUND:
1398 return "MPEG-4 HE AAC + MPEG Surround";
1399 case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC_SURROUND:
1400 return "MPEG-4 AAC LC + MPEG Surround";
1401 }
1402 return "Reserved";
1403}
1404
1405static void hdmi_audio_infoframe_log(const char *level,
1406 struct device *dev,
1407 const struct hdmi_audio_infoframe *frame)
1408{
1409 hdmi_infoframe_log_header(level, dev,
1410 frame: (const struct hdmi_any_infoframe *)frame);
1411
1412 if (frame->channels)
1413 hdmi_log(" channels: %u\n", frame->channels - 1);
1414 else
1415 hdmi_log(" channels: Refer to stream header\n");
1416 hdmi_log(" coding type: %s\n",
1417 hdmi_audio_coding_type_get_name(frame->coding_type));
1418 hdmi_log(" sample size: %s\n",
1419 hdmi_audio_sample_size_get_name(frame->sample_size));
1420 hdmi_log(" sample frequency: %s\n",
1421 hdmi_audio_sample_frequency_get_name(frame->sample_frequency));
1422 hdmi_log(" coding type ext: %s\n",
1423 hdmi_audio_coding_type_ext_get_name(frame->coding_type_ext));
1424 hdmi_log(" channel allocation: 0x%x\n",
1425 frame->channel_allocation);
1426 hdmi_log(" level shift value: %u dB\n",
1427 frame->level_shift_value);
1428 hdmi_log(" downmix inhibit: %s\n",
1429 frame->downmix_inhibit ? "Yes" : "No");
1430}
1431
1432static void hdmi_drm_infoframe_log(const char *level,
1433 struct device *dev,
1434 const struct hdmi_drm_infoframe *frame)
1435{
1436 int i;
1437
1438 hdmi_infoframe_log_header(level, dev,
1439 frame: (struct hdmi_any_infoframe *)frame);
1440 hdmi_log("length: %d\n", frame->length);
1441 hdmi_log("metadata type: %d\n", frame->metadata_type);
1442 hdmi_log("eotf: %d\n", frame->eotf);
1443 for (i = 0; i < 3; i++) {
1444 hdmi_log("x[%d]: %d\n", i, frame->display_primaries[i].x);
1445 hdmi_log("y[%d]: %d\n", i, frame->display_primaries[i].y);
1446 }
1447
1448 hdmi_log("white point x: %d\n", frame->white_point.x);
1449 hdmi_log("white point y: %d\n", frame->white_point.y);
1450
1451 hdmi_log("max_display_mastering_luminance: %d\n",
1452 frame->max_display_mastering_luminance);
1453 hdmi_log("min_display_mastering_luminance: %d\n",
1454 frame->min_display_mastering_luminance);
1455
1456 hdmi_log("max_cll: %d\n", frame->max_cll);
1457 hdmi_log("max_fall: %d\n", frame->max_fall);
1458}
1459
1460static const char *
1461hdmi_3d_structure_get_name(enum hdmi_3d_structure s3d_struct)
1462{
1463 if (s3d_struct < 0 || s3d_struct > 0xf)
1464 return "Invalid";
1465
1466 switch (s3d_struct) {
1467 case HDMI_3D_STRUCTURE_FRAME_PACKING:
1468 return "Frame Packing";
1469 case HDMI_3D_STRUCTURE_FIELD_ALTERNATIVE:
1470 return "Field Alternative";
1471 case HDMI_3D_STRUCTURE_LINE_ALTERNATIVE:
1472 return "Line Alternative";
1473 case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_FULL:
1474 return "Side-by-side (Full)";
1475 case HDMI_3D_STRUCTURE_L_DEPTH:
1476 return "L + Depth";
1477 case HDMI_3D_STRUCTURE_L_DEPTH_GFX_GFX_DEPTH:
1478 return "L + Depth + Graphics + Graphics-depth";
1479 case HDMI_3D_STRUCTURE_TOP_AND_BOTTOM:
1480 return "Top-and-Bottom";
1481 case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF:
1482 return "Side-by-side (Half)";
1483 default:
1484 break;
1485 }
1486 return "Reserved";
1487}
1488
1489static void
1490hdmi_vendor_any_infoframe_log(const char *level,
1491 struct device *dev,
1492 const union hdmi_vendor_any_infoframe *frame)
1493{
1494 const struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
1495
1496 hdmi_infoframe_log_header(level, dev,
1497 frame: (const struct hdmi_any_infoframe *)frame);
1498
1499 if (frame->any.oui != HDMI_IEEE_OUI) {
1500 hdmi_log(" not a HDMI vendor infoframe\n");
1501 return;
1502 }
1503 if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) {
1504 hdmi_log(" empty frame\n");
1505 return;
1506 }
1507
1508 if (hvf->vic)
1509 hdmi_log(" HDMI VIC: %u\n", hvf->vic);
1510 if (hvf->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
1511 hdmi_log(" 3D structure: %s\n",
1512 hdmi_3d_structure_get_name(hvf->s3d_struct));
1513 if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
1514 hdmi_log(" 3D extension data: %d\n",
1515 hvf->s3d_ext_data);
1516 }
1517}
1518
1519/**
1520 * hdmi_infoframe_log() - log info of HDMI infoframe
1521 * @level: logging level
1522 * @dev: device
1523 * @frame: HDMI infoframe
1524 */
1525void hdmi_infoframe_log(const char *level,
1526 struct device *dev,
1527 const union hdmi_infoframe *frame)
1528{
1529 switch (frame->any.type) {
1530 case HDMI_INFOFRAME_TYPE_AVI:
1531 hdmi_avi_infoframe_log(level, dev, frame: &frame->avi);
1532 break;
1533 case HDMI_INFOFRAME_TYPE_SPD:
1534 hdmi_spd_infoframe_log(level, dev, frame: &frame->spd);
1535 break;
1536 case HDMI_INFOFRAME_TYPE_AUDIO:
1537 hdmi_audio_infoframe_log(level, dev, frame: &frame->audio);
1538 break;
1539 case HDMI_INFOFRAME_TYPE_VENDOR:
1540 hdmi_vendor_any_infoframe_log(level, dev, frame: &frame->vendor);
1541 break;
1542 case HDMI_INFOFRAME_TYPE_DRM:
1543 hdmi_drm_infoframe_log(level, dev, frame: &frame->drm);
1544 break;
1545 }
1546}
1547EXPORT_SYMBOL(hdmi_infoframe_log);
1548
1549/**
1550 * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe
1551 * @frame: HDMI AVI infoframe
1552 * @buffer: source buffer
1553 * @size: size of buffer
1554 *
1555 * Unpacks the information contained in binary @buffer into a structured
1556 * @frame of the HDMI Auxiliary Video (AVI) information frame.
1557 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1558 * specification.
1559 *
1560 * Returns 0 on success or a negative error code on failure.
1561 */
1562static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
1563 const void *buffer, size_t size)
1564{
1565 const u8 *ptr = buffer;
1566
1567 if (size < HDMI_INFOFRAME_SIZE(AVI))
1568 return -EINVAL;
1569
1570 if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI ||
1571 ptr[1] != 2 ||
1572 ptr[2] != HDMI_AVI_INFOFRAME_SIZE)
1573 return -EINVAL;
1574
1575 if (hdmi_infoframe_checksum(ptr: buffer, HDMI_INFOFRAME_SIZE(AVI)) != 0)
1576 return -EINVAL;
1577
1578 hdmi_avi_infoframe_init(frame);
1579
1580 ptr += HDMI_INFOFRAME_HEADER_SIZE;
1581
1582 frame->colorspace = (ptr[0] >> 5) & 0x3;
1583 if (ptr[0] & 0x10)
1584 frame->active_aspect = ptr[1] & 0xf;
1585 if (ptr[0] & 0x8) {
1586 frame->top_bar = (ptr[6] << 8) | ptr[5];
1587 frame->bottom_bar = (ptr[8] << 8) | ptr[7];
1588 }
1589 if (ptr[0] & 0x4) {
1590 frame->left_bar = (ptr[10] << 8) | ptr[9];
1591 frame->right_bar = (ptr[12] << 8) | ptr[11];
1592 }
1593 frame->scan_mode = ptr[0] & 0x3;
1594
1595 frame->colorimetry = (ptr[1] >> 6) & 0x3;
1596 frame->picture_aspect = (ptr[1] >> 4) & 0x3;
1597 frame->active_aspect = ptr[1] & 0xf;
1598
1599 frame->itc = ptr[2] & 0x80 ? true : false;
1600 frame->extended_colorimetry = (ptr[2] >> 4) & 0x7;
1601 frame->quantization_range = (ptr[2] >> 2) & 0x3;
1602 frame->nups = ptr[2] & 0x3;
1603
1604 frame->video_code = ptr[3] & 0x7f;
1605 frame->ycc_quantization_range = (ptr[4] >> 6) & 0x3;
1606 frame->content_type = (ptr[4] >> 4) & 0x3;
1607
1608 frame->pixel_repeat = ptr[4] & 0xf;
1609
1610 return 0;
1611}
1612
1613/**
1614 * hdmi_spd_infoframe_unpack() - unpack binary buffer to a HDMI SPD infoframe
1615 * @frame: HDMI SPD infoframe
1616 * @buffer: source buffer
1617 * @size: size of buffer
1618 *
1619 * Unpacks the information contained in binary @buffer into a structured
1620 * @frame of the HDMI Source Product Description (SPD) information frame.
1621 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1622 * specification.
1623 *
1624 * Returns 0 on success or a negative error code on failure.
1625 */
1626static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
1627 const void *buffer, size_t size)
1628{
1629 const u8 *ptr = buffer;
1630 int ret;
1631
1632 if (size < HDMI_INFOFRAME_SIZE(SPD))
1633 return -EINVAL;
1634
1635 if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD ||
1636 ptr[1] != 1 ||
1637 ptr[2] != HDMI_SPD_INFOFRAME_SIZE) {
1638 return -EINVAL;
1639 }
1640
1641 if (hdmi_infoframe_checksum(ptr: buffer, HDMI_INFOFRAME_SIZE(SPD)) != 0)
1642 return -EINVAL;
1643
1644 ptr += HDMI_INFOFRAME_HEADER_SIZE;
1645
1646 ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8);
1647 if (ret)
1648 return ret;
1649
1650 frame->sdi = ptr[24];
1651
1652 return 0;
1653}
1654
1655/**
1656 * hdmi_audio_infoframe_unpack() - unpack binary buffer to a HDMI AUDIO infoframe
1657 * @frame: HDMI Audio infoframe
1658 * @buffer: source buffer
1659 * @size: size of buffer
1660 *
1661 * Unpacks the information contained in binary @buffer into a structured
1662 * @frame of the HDMI Audio information frame.
1663 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1664 * specification.
1665 *
1666 * Returns 0 on success or a negative error code on failure.
1667 */
1668static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
1669 const void *buffer, size_t size)
1670{
1671 const u8 *ptr = buffer;
1672 int ret;
1673
1674 if (size < HDMI_INFOFRAME_SIZE(AUDIO))
1675 return -EINVAL;
1676
1677 if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO ||
1678 ptr[1] != 1 ||
1679 ptr[2] != HDMI_AUDIO_INFOFRAME_SIZE) {
1680 return -EINVAL;
1681 }
1682
1683 if (hdmi_infoframe_checksum(ptr: buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0)
1684 return -EINVAL;
1685
1686 ret = hdmi_audio_infoframe_init(frame);
1687 if (ret)
1688 return ret;
1689
1690 ptr += HDMI_INFOFRAME_HEADER_SIZE;
1691
1692 frame->channels = ptr[0] & 0x7;
1693 frame->coding_type = (ptr[0] >> 4) & 0xf;
1694 frame->sample_size = ptr[1] & 0x3;
1695 frame->sample_frequency = (ptr[1] >> 2) & 0x7;
1696 frame->coding_type_ext = ptr[2] & 0x1f;
1697 frame->channel_allocation = ptr[3];
1698 frame->level_shift_value = (ptr[4] >> 3) & 0xf;
1699 frame->downmix_inhibit = ptr[4] & 0x80 ? true : false;
1700
1701 return 0;
1702}
1703
1704/**
1705 * hdmi_vendor_any_infoframe_unpack() - unpack binary buffer to a HDMI
1706 * vendor infoframe
1707 * @frame: HDMI Vendor infoframe
1708 * @buffer: source buffer
1709 * @size: size of buffer
1710 *
1711 * Unpacks the information contained in binary @buffer into a structured
1712 * @frame of the HDMI Vendor information frame.
1713 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1714 * specification.
1715 *
1716 * Returns 0 on success or a negative error code on failure.
1717 */
1718static int
1719hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
1720 const void *buffer, size_t size)
1721{
1722 const u8 *ptr = buffer;
1723 size_t length;
1724 int ret;
1725 u8 hdmi_video_format;
1726 struct hdmi_vendor_infoframe *hvf = &frame->hdmi;
1727
1728 if (size < HDMI_INFOFRAME_HEADER_SIZE)
1729 return -EINVAL;
1730
1731 if (ptr[0] != HDMI_INFOFRAME_TYPE_VENDOR ||
1732 ptr[1] != 1 ||
1733 (ptr[2] != 4 && ptr[2] != 5 && ptr[2] != 6))
1734 return -EINVAL;
1735
1736 length = ptr[2];
1737
1738 if (size < HDMI_INFOFRAME_HEADER_SIZE + length)
1739 return -EINVAL;
1740
1741 if (hdmi_infoframe_checksum(ptr: buffer,
1742 HDMI_INFOFRAME_HEADER_SIZE + length) != 0)
1743 return -EINVAL;
1744
1745 ptr += HDMI_INFOFRAME_HEADER_SIZE;
1746
1747 /* HDMI OUI */
1748 if ((ptr[0] != 0x03) ||
1749 (ptr[1] != 0x0c) ||
1750 (ptr[2] != 0x00))
1751 return -EINVAL;
1752
1753 hdmi_video_format = ptr[3] >> 5;
1754
1755 if (hdmi_video_format > 0x2)
1756 return -EINVAL;
1757
1758 ret = hdmi_vendor_infoframe_init(hvf);
1759 if (ret)
1760 return ret;
1761
1762 hvf->length = length;
1763
1764 if (hdmi_video_format == 0x2) {
1765 if (length != 5 && length != 6)
1766 return -EINVAL;
1767 hvf->s3d_struct = ptr[4] >> 4;
1768 if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) {
1769 if (length != 6)
1770 return -EINVAL;
1771 hvf->s3d_ext_data = ptr[5] >> 4;
1772 }
1773 } else if (hdmi_video_format == 0x1) {
1774 if (length != 5)
1775 return -EINVAL;
1776 hvf->vic = ptr[4];
1777 } else {
1778 if (length != 4)
1779 return -EINVAL;
1780 }
1781
1782 return 0;
1783}
1784
1785/**
1786 * hdmi_drm_infoframe_unpack_only() - unpack binary buffer of CTA-861-G DRM
1787 * infoframe DataBytes to a HDMI DRM
1788 * infoframe
1789 * @frame: HDMI DRM infoframe
1790 * @buffer: source buffer
1791 * @size: size of buffer
1792 *
1793 * Unpacks CTA-861-G DRM infoframe DataBytes contained in the binary @buffer
1794 * into a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
1795 * infoframe.
1796 *
1797 * Returns 0 on success or a negative error code on failure.
1798 */
1799int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame,
1800 const void *buffer, size_t size)
1801{
1802 const u8 *ptr = buffer;
1803 const u8 *temp;
1804 u8 x_lsb, x_msb;
1805 u8 y_lsb, y_msb;
1806 int ret;
1807 int i;
1808
1809 if (size < HDMI_DRM_INFOFRAME_SIZE)
1810 return -EINVAL;
1811
1812 ret = hdmi_drm_infoframe_init(frame);
1813 if (ret)
1814 return ret;
1815
1816 frame->eotf = ptr[0] & 0x7;
1817 frame->metadata_type = ptr[1] & 0x7;
1818
1819 temp = ptr + 2;
1820 for (i = 0; i < 3; i++) {
1821 x_lsb = *temp++;
1822 x_msb = *temp++;
1823 frame->display_primaries[i].x = (x_msb << 8) | x_lsb;
1824 y_lsb = *temp++;
1825 y_msb = *temp++;
1826 frame->display_primaries[i].y = (y_msb << 8) | y_lsb;
1827 }
1828
1829 frame->white_point.x = (ptr[15] << 8) | ptr[14];
1830 frame->white_point.y = (ptr[17] << 8) | ptr[16];
1831
1832 frame->max_display_mastering_luminance = (ptr[19] << 8) | ptr[18];
1833 frame->min_display_mastering_luminance = (ptr[21] << 8) | ptr[20];
1834 frame->max_cll = (ptr[23] << 8) | ptr[22];
1835 frame->max_fall = (ptr[25] << 8) | ptr[24];
1836
1837 return 0;
1838}
1839EXPORT_SYMBOL(hdmi_drm_infoframe_unpack_only);
1840
1841/**
1842 * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe
1843 * @frame: HDMI DRM infoframe
1844 * @buffer: source buffer
1845 * @size: size of buffer
1846 *
1847 * Unpacks the CTA-861-G DRM infoframe contained in the binary @buffer into
1848 * a structured @frame of the HDMI Dynamic Range and Mastering (DRM)
1849 * infoframe. It also verifies the checksum as required by section 5.3.5 of
1850 * the HDMI 1.4 specification.
1851 *
1852 * Returns 0 on success or a negative error code on failure.
1853 */
1854static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame,
1855 const void *buffer, size_t size)
1856{
1857 const u8 *ptr = buffer;
1858 int ret;
1859
1860 if (size < HDMI_INFOFRAME_SIZE(DRM))
1861 return -EINVAL;
1862
1863 if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM ||
1864 ptr[1] != 1 ||
1865 ptr[2] != HDMI_DRM_INFOFRAME_SIZE)
1866 return -EINVAL;
1867
1868 if (hdmi_infoframe_checksum(ptr: buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0)
1869 return -EINVAL;
1870
1871 ret = hdmi_drm_infoframe_unpack_only(frame, ptr + HDMI_INFOFRAME_HEADER_SIZE,
1872 size - HDMI_INFOFRAME_HEADER_SIZE);
1873 return ret;
1874}
1875
1876/**
1877 * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
1878 * @frame: HDMI infoframe
1879 * @buffer: source buffer
1880 * @size: size of buffer
1881 *
1882 * Unpacks the information contained in binary buffer @buffer into a structured
1883 * @frame of a HDMI infoframe.
1884 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
1885 * specification.
1886 *
1887 * Returns 0 on success or a negative error code on failure.
1888 */
1889int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
1890 const void *buffer, size_t size)
1891{
1892 int ret;
1893 const u8 *ptr = buffer;
1894
1895 if (size < HDMI_INFOFRAME_HEADER_SIZE)
1896 return -EINVAL;
1897
1898 switch (ptr[0]) {
1899 case HDMI_INFOFRAME_TYPE_AVI:
1900 ret = hdmi_avi_infoframe_unpack(frame: &frame->avi, buffer, size);
1901 break;
1902 case HDMI_INFOFRAME_TYPE_DRM:
1903 ret = hdmi_drm_infoframe_unpack(frame: &frame->drm, buffer, size);
1904 break;
1905 case HDMI_INFOFRAME_TYPE_SPD:
1906 ret = hdmi_spd_infoframe_unpack(frame: &frame->spd, buffer, size);
1907 break;
1908 case HDMI_INFOFRAME_TYPE_AUDIO:
1909 ret = hdmi_audio_infoframe_unpack(frame: &frame->audio, buffer, size);
1910 break;
1911 case HDMI_INFOFRAME_TYPE_VENDOR:
1912 ret = hdmi_vendor_any_infoframe_unpack(frame: &frame->vendor, buffer, size);
1913 break;
1914 default:
1915 ret = -EINVAL;
1916 break;
1917 }
1918
1919 return ret;
1920}
1921EXPORT_SYMBOL(hdmi_infoframe_unpack);
1922