Thierry Reding | f142d3b | 2012-11-21 15:29:29 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Avionic Design GmbH |
| 3 | * |
Thierry Reding | 96d672e0 | 2013-04-08 12:48:19 +0000 | [diff] [blame] | 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. |
Thierry Reding | f142d3b | 2012-11-21 15:29:29 +0100 | [diff] [blame] | 22 | */ |
| 23 | |
| 24 | #include <linux/bitops.h> |
Damien Lespiau | 72b0989 | 2013-08-06 20:32:14 +0100 | [diff] [blame^] | 25 | #include <linux/bug.h> |
Thierry Reding | f142d3b | 2012-11-21 15:29:29 +0100 | [diff] [blame] | 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; |
Damien Lespiau | 3c6b054 | 2013-08-06 20:32:13 +0100 | [diff] [blame] | 56 | frame->length = HDMI_AVI_INFOFRAME_SIZE; |
Thierry Reding | f142d3b | 2012-11-21 15:29:29 +0100 | [diff] [blame] | 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, length); |
| 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 | if (frame->active_info_valid) |
| 100 | ptr[0] |= BIT(4); |
| 101 | |
| 102 | if (frame->horizontal_bar_valid) |
| 103 | ptr[0] |= BIT(3); |
| 104 | |
| 105 | if (frame->vertical_bar_valid) |
| 106 | ptr[0] |= BIT(2); |
| 107 | |
| 108 | ptr[1] = ((frame->colorimetry & 0x3) << 6) | |
| 109 | ((frame->picture_aspect & 0x3) << 4) | |
| 110 | (frame->active_aspect & 0xf); |
| 111 | |
| 112 | ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) | |
| 113 | ((frame->quantization_range & 0x3) << 2) | |
| 114 | (frame->nups & 0x3); |
| 115 | |
| 116 | if (frame->itc) |
| 117 | ptr[2] |= BIT(7); |
| 118 | |
| 119 | ptr[3] = frame->video_code & 0x7f; |
| 120 | |
| 121 | ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) | |
| 122 | ((frame->content_type & 0x3) << 4) | |
| 123 | (frame->pixel_repeat & 0xf); |
| 124 | |
| 125 | ptr[5] = frame->top_bar & 0xff; |
| 126 | ptr[6] = (frame->top_bar >> 8) & 0xff; |
| 127 | ptr[7] = frame->bottom_bar & 0xff; |
| 128 | ptr[8] = (frame->bottom_bar >> 8) & 0xff; |
| 129 | ptr[9] = frame->left_bar & 0xff; |
| 130 | ptr[10] = (frame->left_bar >> 8) & 0xff; |
| 131 | ptr[11] = frame->right_bar & 0xff; |
| 132 | ptr[12] = (frame->right_bar >> 8) & 0xff; |
| 133 | |
| 134 | hdmi_infoframe_checksum(buffer, length); |
| 135 | |
| 136 | return length; |
| 137 | } |
| 138 | EXPORT_SYMBOL(hdmi_avi_infoframe_pack); |
| 139 | |
| 140 | /** |
| 141 | * hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe |
| 142 | * @frame: HDMI SPD infoframe |
| 143 | * @vendor: vendor string |
| 144 | * @product: product string |
| 145 | * |
| 146 | * Returns 0 on success or a negative error code on failure. |
| 147 | */ |
| 148 | int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame, |
| 149 | const char *vendor, const char *product) |
| 150 | { |
| 151 | memset(frame, 0, sizeof(*frame)); |
| 152 | |
| 153 | frame->type = HDMI_INFOFRAME_TYPE_SPD; |
| 154 | frame->version = 1; |
Damien Lespiau | 3c6b054 | 2013-08-06 20:32:13 +0100 | [diff] [blame] | 155 | frame->length = HDMI_SPD_INFOFRAME_SIZE; |
Thierry Reding | f142d3b | 2012-11-21 15:29:29 +0100 | [diff] [blame] | 156 | |
| 157 | strncpy(frame->vendor, vendor, sizeof(frame->vendor)); |
| 158 | strncpy(frame->product, product, sizeof(frame->product)); |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | EXPORT_SYMBOL(hdmi_spd_infoframe_init); |
| 163 | |
| 164 | /** |
| 165 | * hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer |
| 166 | * @frame: HDMI SPD infoframe |
| 167 | * @buffer: destination buffer |
| 168 | * @size: size of buffer |
| 169 | * |
| 170 | * Packs the information contained in the @frame structure into a binary |
| 171 | * representation that can be written into the corresponding controller |
| 172 | * registers. Also computes the checksum as required by section 5.3.5 of |
| 173 | * the HDMI 1.4 specification. |
| 174 | * |
| 175 | * Returns the number of bytes packed into the binary buffer or a negative |
| 176 | * error code on failure. |
| 177 | */ |
| 178 | ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer, |
| 179 | size_t size) |
| 180 | { |
| 181 | u8 *ptr = buffer; |
| 182 | size_t length; |
| 183 | |
| 184 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
| 185 | |
| 186 | if (size < length) |
| 187 | return -ENOSPC; |
| 188 | |
| 189 | memset(buffer, 0, length); |
| 190 | |
| 191 | ptr[0] = frame->type; |
| 192 | ptr[1] = frame->version; |
| 193 | ptr[2] = frame->length; |
| 194 | ptr[3] = 0; /* checksum */ |
| 195 | |
| 196 | /* start infoframe payload */ |
| 197 | ptr += HDMI_INFOFRAME_HEADER_SIZE; |
| 198 | |
| 199 | memcpy(ptr, frame->vendor, sizeof(frame->vendor)); |
| 200 | memcpy(ptr + 8, frame->product, sizeof(frame->product)); |
| 201 | |
| 202 | ptr[24] = frame->sdi; |
| 203 | |
| 204 | hdmi_infoframe_checksum(buffer, length); |
| 205 | |
| 206 | return length; |
| 207 | } |
| 208 | EXPORT_SYMBOL(hdmi_spd_infoframe_pack); |
| 209 | |
| 210 | /** |
| 211 | * hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe |
| 212 | * @frame: HDMI audio infoframe |
| 213 | * |
| 214 | * Returns 0 on success or a negative error code on failure. |
| 215 | */ |
| 216 | int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame) |
| 217 | { |
| 218 | memset(frame, 0, sizeof(*frame)); |
| 219 | |
| 220 | frame->type = HDMI_INFOFRAME_TYPE_AUDIO; |
| 221 | frame->version = 1; |
Damien Lespiau | 3c6b054 | 2013-08-06 20:32:13 +0100 | [diff] [blame] | 222 | frame->length = HDMI_AUDIO_INFOFRAME_SIZE; |
Thierry Reding | f142d3b | 2012-11-21 15:29:29 +0100 | [diff] [blame] | 223 | |
| 224 | return 0; |
| 225 | } |
| 226 | EXPORT_SYMBOL(hdmi_audio_infoframe_init); |
| 227 | |
| 228 | /** |
| 229 | * hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer |
| 230 | * @frame: HDMI audio infoframe |
| 231 | * @buffer: destination buffer |
| 232 | * @size: size of buffer |
| 233 | * |
| 234 | * Packs the information contained in the @frame structure into a binary |
| 235 | * representation that can be written into the corresponding controller |
| 236 | * registers. Also computes the checksum as required by section 5.3.5 of |
| 237 | * the HDMI 1.4 specification. |
| 238 | * |
| 239 | * Returns the number of bytes packed into the binary buffer or a negative |
| 240 | * error code on failure. |
| 241 | */ |
| 242 | ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame, |
| 243 | void *buffer, size_t size) |
| 244 | { |
| 245 | unsigned char channels; |
| 246 | u8 *ptr = buffer; |
| 247 | size_t length; |
| 248 | |
| 249 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
| 250 | |
| 251 | if (size < length) |
| 252 | return -ENOSPC; |
| 253 | |
| 254 | memset(buffer, 0, length); |
| 255 | |
| 256 | if (frame->channels >= 2) |
| 257 | channels = frame->channels - 1; |
| 258 | else |
| 259 | channels = 0; |
| 260 | |
| 261 | ptr[0] = frame->type; |
| 262 | ptr[1] = frame->version; |
| 263 | ptr[2] = frame->length; |
| 264 | ptr[3] = 0; /* checksum */ |
| 265 | |
| 266 | /* start infoframe payload */ |
| 267 | ptr += HDMI_INFOFRAME_HEADER_SIZE; |
| 268 | |
| 269 | ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7); |
| 270 | ptr[1] = ((frame->sample_frequency & 0x7) << 2) | |
| 271 | (frame->sample_size & 0x3); |
| 272 | ptr[2] = frame->coding_type_ext & 0x1f; |
| 273 | ptr[3] = frame->channel_allocation; |
| 274 | ptr[4] = (frame->level_shift_value & 0xf) << 3; |
| 275 | |
| 276 | if (frame->downmix_inhibit) |
| 277 | ptr[4] |= BIT(7); |
| 278 | |
| 279 | hdmi_infoframe_checksum(buffer, length); |
| 280 | |
| 281 | return length; |
| 282 | } |
| 283 | EXPORT_SYMBOL(hdmi_audio_infoframe_pack); |
| 284 | |
| 285 | /** |
| 286 | * hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary |
| 287 | * buffer |
| 288 | * @frame: HDMI vendor infoframe |
| 289 | * @buffer: destination buffer |
| 290 | * @size: size of buffer |
| 291 | * |
| 292 | * Packs the information contained in the @frame structure into a binary |
| 293 | * representation that can be written into the corresponding controller |
| 294 | * registers. Also computes the checksum as required by section 5.3.5 of |
| 295 | * the HDMI 1.4 specification. |
| 296 | * |
| 297 | * Returns the number of bytes packed into the binary buffer or a negative |
| 298 | * error code on failure. |
| 299 | */ |
| 300 | ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame, |
| 301 | void *buffer, size_t size) |
| 302 | { |
| 303 | u8 *ptr = buffer; |
| 304 | size_t length; |
| 305 | |
| 306 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
| 307 | |
| 308 | if (size < length) |
| 309 | return -ENOSPC; |
| 310 | |
| 311 | memset(buffer, 0, length); |
| 312 | |
| 313 | ptr[0] = frame->type; |
| 314 | ptr[1] = frame->version; |
| 315 | ptr[2] = frame->length; |
| 316 | ptr[3] = 0; /* checksum */ |
| 317 | |
| 318 | memcpy(&ptr[HDMI_INFOFRAME_HEADER_SIZE], frame->data, frame->length); |
| 319 | |
| 320 | hdmi_infoframe_checksum(buffer, length); |
| 321 | |
| 322 | return length; |
| 323 | } |
| 324 | EXPORT_SYMBOL(hdmi_vendor_infoframe_pack); |
Damien Lespiau | 72b0989 | 2013-08-06 20:32:14 +0100 | [diff] [blame^] | 325 | |
| 326 | /** |
| 327 | * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer |
| 328 | * @frame: HDMI infoframe |
| 329 | * @buffer: destination buffer |
| 330 | * @size: size of buffer |
| 331 | * |
| 332 | * Packs the information contained in the @frame structure into a binary |
| 333 | * representation that can be written into the corresponding controller |
| 334 | * registers. Also computes the checksum as required by section 5.3.5 of |
| 335 | * the HDMI 1.4 specification. |
| 336 | * |
| 337 | * Returns the number of bytes packed into the binary buffer or a negative |
| 338 | * error code on failure. |
| 339 | */ |
| 340 | ssize_t |
| 341 | hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size) |
| 342 | { |
| 343 | ssize_t length; |
| 344 | |
| 345 | switch (frame->any.type) { |
| 346 | case HDMI_INFOFRAME_TYPE_AVI: |
| 347 | length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size); |
| 348 | break; |
| 349 | case HDMI_INFOFRAME_TYPE_SPD: |
| 350 | length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size); |
| 351 | break; |
| 352 | case HDMI_INFOFRAME_TYPE_AUDIO: |
| 353 | length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size); |
| 354 | break; |
| 355 | case HDMI_INFOFRAME_TYPE_VENDOR: |
| 356 | length = hdmi_vendor_infoframe_pack(&frame->vendor, |
| 357 | buffer, size); |
| 358 | break; |
| 359 | default: |
| 360 | WARN(1, "Bad infoframe type %d\n", frame->any.type); |
| 361 | length = -EINVAL; |
| 362 | } |
| 363 | |
| 364 | return length; |
| 365 | } |
| 366 | EXPORT_SYMBOL(hdmi_infoframe_pack); |