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  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 <linux/bitops.h>
  25. #include <linux/bug.h>
  26. #include <linux/errno.h>
  27. #include <linux/export.h>
  28. #include <linux/hdmi.h>
  29. #include <linux/string.h>
  30.  
  31. static void hdmi_infoframe_checksum(void *buffer, size_t size)
  32. {
  33.         u8 *ptr = buffer;
  34.         u8 csum = 0;
  35.         size_t i;
  36.  
  37.         /* compute checksum */
  38.         for (i = 0; i < size; i++)
  39.                 csum += ptr[i];
  40.  
  41.         ptr[3] = 256 - csum;
  42. }
  43.  
  44. /**
  45.  * hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
  46.  * @frame: HDMI AVI infoframe
  47.  *
  48.  * Returns 0 on success or a negative error code on failure.
  49.  */
  50. int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
  51. {
  52.         memset(frame, 0, sizeof(*frame));
  53.  
  54.         frame->type = HDMI_INFOFRAME_TYPE_AVI;
  55.         frame->version = 2;
  56.         frame->length = HDMI_AVI_INFOFRAME_SIZE;
  57.  
  58.         return 0;
  59. }
  60. EXPORT_SYMBOL(hdmi_avi_infoframe_init);
  61.  
  62. /**
  63.  * hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer
  64.  * @frame: HDMI AVI infoframe
  65.  * @buffer: destination buffer
  66.  * @size: size of buffer
  67.  *
  68.  * Packs the information contained in the @frame structure into a binary
  69.  * representation that can be written into the corresponding controller
  70.  * registers. Also computes the checksum as required by section 5.3.5 of
  71.  * the HDMI 1.4 specification.
  72.  *
  73.  * Returns the number of bytes packed into the binary buffer or a negative
  74.  * error code on failure.
  75.  */
  76. ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,
  77.                                 size_t size)
  78. {
  79.         u8 *ptr = buffer;
  80.         size_t length;
  81.  
  82.         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
  83.  
  84.         if (size < length)
  85.                 return -ENOSPC;
  86.  
  87.         memset(buffer, 0, size);
  88.  
  89.         ptr[0] = frame->type;
  90.         ptr[1] = frame->version;
  91.         ptr[2] = frame->length;
  92.         ptr[3] = 0; /* checksum */
  93.  
  94.         /* start infoframe payload */
  95.         ptr += HDMI_INFOFRAME_HEADER_SIZE;
  96.  
  97.         ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);
  98.  
  99.         /*
  100.          * Data byte 1, bit 4 has to be set if we provide the active format
  101.          * aspect ratio
  102.          */
  103.         if (frame->active_aspect & 0xf)
  104.                 ptr[0] |= BIT(4);
  105.  
  106.         /* Bit 3 and 2 indicate if we transmit horizontal/vertical bar data */
  107.         if (frame->top_bar || frame->bottom_bar)
  108.                 ptr[0] |= BIT(3);
  109.  
  110.         if (frame->left_bar || frame->right_bar)
  111.                 ptr[0] |= BIT(2);
  112.  
  113.         ptr[1] = ((frame->colorimetry & 0x3) << 6) |
  114.                  ((frame->picture_aspect & 0x3) << 4) |
  115.                  (frame->active_aspect & 0xf);
  116.  
  117.         ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) |
  118.                  ((frame->quantization_range & 0x3) << 2) |
  119.                  (frame->nups & 0x3);
  120.  
  121.         if (frame->itc)
  122.                 ptr[2] |= BIT(7);
  123.  
  124.         ptr[3] = frame->video_code & 0x7f;
  125.  
  126.         ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) |
  127.                  ((frame->content_type & 0x3) << 4) |
  128.                  (frame->pixel_repeat & 0xf);
  129.  
  130.         ptr[5] = frame->top_bar & 0xff;
  131.         ptr[6] = (frame->top_bar >> 8) & 0xff;
  132.         ptr[7] = frame->bottom_bar & 0xff;
  133.         ptr[8] = (frame->bottom_bar >> 8) & 0xff;
  134.         ptr[9] = frame->left_bar & 0xff;
  135.         ptr[10] = (frame->left_bar >> 8) & 0xff;
  136.         ptr[11] = frame->right_bar & 0xff;
  137.         ptr[12] = (frame->right_bar >> 8) & 0xff;
  138.  
  139.         hdmi_infoframe_checksum(buffer, length);
  140.  
  141.         return length;
  142. }
  143. EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
  144.  
  145. /**
  146.  * hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
  147.  * @frame: HDMI SPD infoframe
  148.  * @vendor: vendor string
  149.  * @product: product string
  150.  *
  151.  * Returns 0 on success or a negative error code on failure.
  152.  */
  153. int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
  154.                             const char *vendor, const char *product)
  155. {
  156.         memset(frame, 0, sizeof(*frame));
  157.  
  158.         frame->type = HDMI_INFOFRAME_TYPE_SPD;
  159.         frame->version = 1;
  160.         frame->length = HDMI_SPD_INFOFRAME_SIZE;
  161.  
  162.         strncpy(frame->vendor, vendor, sizeof(frame->vendor));
  163.         strncpy(frame->product, product, sizeof(frame->product));
  164.  
  165.         return 0;
  166. }
  167. EXPORT_SYMBOL(hdmi_spd_infoframe_init);
  168.  
  169. /**
  170.  * hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer
  171.  * @frame: HDMI SPD infoframe
  172.  * @buffer: destination buffer
  173.  * @size: size of buffer
  174.  *
  175.  * Packs the information contained in the @frame structure into a binary
  176.  * representation that can be written into the corresponding controller
  177.  * registers. Also computes the checksum as required by section 5.3.5 of
  178.  * the HDMI 1.4 specification.
  179.  *
  180.  * Returns the number of bytes packed into the binary buffer or a negative
  181.  * error code on failure.
  182.  */
  183. ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
  184.                                 size_t size)
  185. {
  186.         u8 *ptr = buffer;
  187.         size_t length;
  188.  
  189.         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
  190.  
  191.         if (size < length)
  192.                 return -ENOSPC;
  193.  
  194.         memset(buffer, 0, size);
  195.  
  196.         ptr[0] = frame->type;
  197.         ptr[1] = frame->version;
  198.         ptr[2] = frame->length;
  199.         ptr[3] = 0; /* checksum */
  200.  
  201.         /* start infoframe payload */
  202.         ptr += HDMI_INFOFRAME_HEADER_SIZE;
  203.  
  204.         memcpy(ptr, frame->vendor, sizeof(frame->vendor));
  205.         memcpy(ptr + 8, frame->product, sizeof(frame->product));
  206.  
  207.         ptr[24] = frame->sdi;
  208.  
  209.         hdmi_infoframe_checksum(buffer, length);
  210.  
  211.         return length;
  212. }
  213. EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
  214.  
  215. /**
  216.  * hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
  217.  * @frame: HDMI audio infoframe
  218.  *
  219.  * Returns 0 on success or a negative error code on failure.
  220.  */
  221. int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
  222. {
  223.         memset(frame, 0, sizeof(*frame));
  224.  
  225.         frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
  226.         frame->version = 1;
  227.         frame->length = HDMI_AUDIO_INFOFRAME_SIZE;
  228.  
  229.         return 0;
  230. }
  231. EXPORT_SYMBOL(hdmi_audio_infoframe_init);
  232.  
  233. /**
  234.  * hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer
  235.  * @frame: HDMI audio infoframe
  236.  * @buffer: destination buffer
  237.  * @size: size of buffer
  238.  *
  239.  * Packs the information contained in the @frame structure into a binary
  240.  * representation that can be written into the corresponding controller
  241.  * registers. Also computes the checksum as required by section 5.3.5 of
  242.  * the HDMI 1.4 specification.
  243.  *
  244.  * Returns the number of bytes packed into the binary buffer or a negative
  245.  * error code on failure.
  246.  */
  247. ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
  248.                                   void *buffer, size_t size)
  249. {
  250.         unsigned char channels;
  251.         u8 *ptr = buffer;
  252.         size_t length;
  253.  
  254.         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
  255.  
  256.         if (size < length)
  257.                 return -ENOSPC;
  258.  
  259.         memset(buffer, 0, size);
  260.  
  261.         if (frame->channels >= 2)
  262.                 channels = frame->channels - 1;
  263.         else
  264.                 channels = 0;
  265.  
  266.         ptr[0] = frame->type;
  267.         ptr[1] = frame->version;
  268.         ptr[2] = frame->length;
  269.         ptr[3] = 0; /* checksum */
  270.  
  271.         /* start infoframe payload */
  272.         ptr += HDMI_INFOFRAME_HEADER_SIZE;
  273.  
  274.         ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
  275.         ptr[1] = ((frame->sample_frequency & 0x7) << 2) |
  276.                  (frame->sample_size & 0x3);
  277.         ptr[2] = frame->coding_type_ext & 0x1f;
  278.         ptr[3] = frame->channel_allocation;
  279.         ptr[4] = (frame->level_shift_value & 0xf) << 3;
  280.  
  281.         if (frame->downmix_inhibit)
  282.                 ptr[4] |= BIT(7);
  283.  
  284.         hdmi_infoframe_checksum(buffer, length);
  285.  
  286.         return length;
  287. }
  288. EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
  289.  
  290. /**
  291.  * hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe
  292.  * @frame: HDMI vendor infoframe
  293.  *
  294.  * Returns 0 on success or a negative error code on failure.
  295.  */
  296. int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame)
  297. {
  298.         memset(frame, 0, sizeof(*frame));
  299.  
  300.         frame->type = HDMI_INFOFRAME_TYPE_VENDOR;
  301.         frame->version = 1;
  302.  
  303.         frame->oui = HDMI_IEEE_OUI;
  304.  
  305.         /*
  306.          * 0 is a valid value for s3d_struct, so we use a special "not set"
  307.          * value
  308.          */
  309.         frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
  310.  
  311.         return 0;
  312. }
  313. EXPORT_SYMBOL(hdmi_vendor_infoframe_init);
  314.  
  315. /**
  316.  * hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary buffer
  317.  * @frame: HDMI infoframe
  318.  * @buffer: destination buffer
  319.  * @size: size of buffer
  320.  *
  321.  * Packs the information contained in the @frame structure into a binary
  322.  * representation that can be written into the corresponding controller
  323.  * registers. Also computes the checksum as required by section 5.3.5 of
  324.  * the HDMI 1.4 specification.
  325.  *
  326.  * Returns the number of bytes packed into the binary buffer or a negative
  327.  * error code on failure.
  328.  */
  329. ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
  330.                                  void *buffer, size_t size)
  331. {
  332.         u8 *ptr = buffer;
  333.         size_t length;
  334.  
  335.         /* empty info frame */
  336.         if (frame->vic == 0 && frame->s3d_struct == HDMI_3D_STRUCTURE_INVALID)
  337.                 return -EINVAL;
  338.  
  339.         /* only one of those can be supplied */
  340.         if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
  341.                 return -EINVAL;
  342.  
  343.         /* for side by side (half) we also need to provide 3D_Ext_Data */
  344.         if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
  345.                 frame->length = 6;
  346.         else
  347.                 frame->length = 5;
  348.  
  349.         length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
  350.  
  351.         if (size < length)
  352.                 return -ENOSPC;
  353.  
  354.         memset(buffer, 0, size);
  355.  
  356.         ptr[0] = frame->type;
  357.         ptr[1] = frame->version;
  358.         ptr[2] = frame->length;
  359.         ptr[3] = 0; /* checksum */
  360.  
  361.         /* HDMI OUI */
  362.         ptr[4] = 0x03;
  363.         ptr[5] = 0x0c;
  364.         ptr[6] = 0x00;
  365.  
  366.         if (frame->vic) {
  367.                 ptr[7] = 0x1 << 5;      /* video format */
  368.                 ptr[8] = frame->vic;
  369.         } else {
  370.                 ptr[7] = 0x2 << 5;      /* video format */
  371.                 ptr[8] = (frame->s3d_struct & 0xf) << 4;
  372.                 if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
  373.                         ptr[9] = (frame->s3d_ext_data & 0xf) << 4;
  374.         }
  375.  
  376.         hdmi_infoframe_checksum(buffer, length);
  377.  
  378.         return length;
  379. }
  380. EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
  381.  
  382. /*
  383.  * hdmi_vendor_any_infoframe_pack() - write a vendor infoframe to binary buffer
  384.  */
  385. static ssize_t
  386. hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,
  387.                            void *buffer, size_t size)
  388. {
  389.         /* we only know about HDMI vendor infoframes */
  390.         if (frame->any.oui != HDMI_IEEE_OUI)
  391.                 return -EINVAL;
  392.  
  393.         return hdmi_vendor_infoframe_pack(&frame->hdmi, buffer, size);
  394. }
  395.  
  396. /**
  397.  * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer
  398.  * @frame: HDMI infoframe
  399.  * @buffer: destination buffer
  400.  * @size: size of buffer
  401.  *
  402.  * Packs the information contained in the @frame structure into a binary
  403.  * representation that can be written into the corresponding controller
  404.  * registers. Also computes the checksum as required by section 5.3.5 of
  405.  * the HDMI 1.4 specification.
  406.  *
  407.  * Returns the number of bytes packed into the binary buffer or a negative
  408.  * error code on failure.
  409.  */
  410. ssize_t
  411. hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size)
  412. {
  413.         ssize_t length;
  414.  
  415.         switch (frame->any.type) {
  416.         case HDMI_INFOFRAME_TYPE_AVI:
  417.                 length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
  418.                 break;
  419.         case HDMI_INFOFRAME_TYPE_SPD:
  420.                 length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
  421.                 break;
  422.         case HDMI_INFOFRAME_TYPE_AUDIO:
  423.                 length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
  424.                 break;
  425.         case HDMI_INFOFRAME_TYPE_VENDOR:
  426.                 length = hdmi_vendor_any_infoframe_pack(&frame->vendor,
  427.                                                         buffer, size);
  428.                 break;
  429.         default:
  430.                 WARN(1, "Bad infoframe type %d\n", frame->any.type);
  431.                 length = -EINVAL;
  432.         }
  433.  
  434.         return length;
  435. }
  436. EXPORT_SYMBOL(hdmi_infoframe_pack);
  437.