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4104 | Serge | 1 | /* |
2 | * Copyright (C) 2012 Avionic Design GmbH |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sub license, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the |
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12 | * next paragraph) shall be included in all copies or substantial portions |
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13 | * of the Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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21 | * DEALINGS IN THE SOFTWARE. |
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22 | */ |
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23 | |||
24 | #include |
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25 | #include |
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26 | #include |
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27 | #include |
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28 | #include |
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29 | #include |
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30 | |||
31 | static void hdmi_infoframe_checksum(void *buffer, size_t size) |
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32 | { |
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33 | u8 *ptr = buffer; |
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34 | u8 csum = 0; |
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35 | size_t i; |
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36 | |||
37 | /* compute checksum */ |
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38 | for (i = 0; i < size; i++) |
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39 | csum += ptr[i]; |
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40 | |||
41 | ptr[3] = 256 - csum; |
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42 | } |
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43 | |||
44 | /** |
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45 | * hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe |
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46 | * @frame: HDMI AVI infoframe |
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47 | * |
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48 | * Returns 0 on success or a negative error code on failure. |
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49 | */ |
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50 | int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame) |
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51 | { |
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52 | memset(frame, 0, sizeof(*frame)); |
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53 | |||
54 | frame->type = HDMI_INFOFRAME_TYPE_AVI; |
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55 | frame->version = 2; |
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56 | frame->length = HDMI_AVI_INFOFRAME_SIZE; |
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57 | |||
58 | return 0; |
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59 | } |
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60 | EXPORT_SYMBOL(hdmi_avi_infoframe_init); |
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61 | |||
62 | /** |
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63 | * hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer |
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64 | * @frame: HDMI AVI infoframe |
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65 | * @buffer: destination buffer |
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66 | * @size: size of buffer |
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67 | * |
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68 | * Packs the information contained in the @frame structure into a binary |
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69 | * representation that can be written into the corresponding controller |
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70 | * registers. Also computes the checksum as required by section 5.3.5 of |
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71 | * the HDMI 1.4 specification. |
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72 | * |
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73 | * Returns the number of bytes packed into the binary buffer or a negative |
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74 | * error code on failure. |
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75 | */ |
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76 | ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer, |
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77 | size_t size) |
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78 | { |
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79 | u8 *ptr = buffer; |
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80 | size_t length; |
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81 | |||
82 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
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83 | |||
84 | if (size < length) |
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85 | return -ENOSPC; |
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86 | |||
87 | memset(buffer, 0, size); |
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88 | |||
89 | ptr[0] = frame->type; |
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90 | ptr[1] = frame->version; |
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91 | ptr[2] = frame->length; |
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92 | ptr[3] = 0; /* checksum */ |
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93 | |||
94 | /* start infoframe payload */ |
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95 | ptr += HDMI_INFOFRAME_HEADER_SIZE; |
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96 | |||
97 | ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3); |
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98 | |||
99 | /* |
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100 | * Data byte 1, bit 4 has to be set if we provide the active format |
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101 | * aspect ratio |
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102 | */ |
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103 | if (frame->active_aspect & 0xf) |
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104 | ptr[0] |= BIT(4); |
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105 | |||
106 | /* Bit 3 and 2 indicate if we transmit horizontal/vertical bar data */ |
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107 | if (frame->top_bar || frame->bottom_bar) |
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108 | ptr[0] |= BIT(3); |
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109 | |||
110 | if (frame->left_bar || frame->right_bar) |
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111 | ptr[0] |= BIT(2); |
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112 | |||
113 | ptr[1] = ((frame->colorimetry & 0x3) << 6) | |
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114 | ((frame->picture_aspect & 0x3) << 4) | |
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115 | (frame->active_aspect & 0xf); |
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116 | |||
117 | ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) | |
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118 | ((frame->quantization_range & 0x3) << 2) | |
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119 | (frame->nups & 0x3); |
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120 | |||
121 | if (frame->itc) |
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122 | ptr[2] |= BIT(7); |
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123 | |||
124 | ptr[3] = frame->video_code & 0x7f; |
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125 | |||
126 | ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) | |
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127 | ((frame->content_type & 0x3) << 4) | |
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128 | (frame->pixel_repeat & 0xf); |
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129 | |||
130 | ptr[5] = frame->top_bar & 0xff; |
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131 | ptr[6] = (frame->top_bar >> 8) & 0xff; |
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132 | ptr[7] = frame->bottom_bar & 0xff; |
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133 | ptr[8] = (frame->bottom_bar >> 8) & 0xff; |
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134 | ptr[9] = frame->left_bar & 0xff; |
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135 | ptr[10] = (frame->left_bar >> 8) & 0xff; |
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136 | ptr[11] = frame->right_bar & 0xff; |
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137 | ptr[12] = (frame->right_bar >> 8) & 0xff; |
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138 | |||
139 | hdmi_infoframe_checksum(buffer, length); |
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140 | |||
141 | return length; |
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142 | } |
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143 | EXPORT_SYMBOL(hdmi_avi_infoframe_pack); |
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144 | |||
145 | /** |
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146 | * hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe |
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147 | * @frame: HDMI SPD infoframe |
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148 | * @vendor: vendor string |
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149 | * @product: product string |
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150 | * |
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151 | * Returns 0 on success or a negative error code on failure. |
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152 | */ |
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153 | int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame, |
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154 | const char *vendor, const char *product) |
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155 | { |
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156 | memset(frame, 0, sizeof(*frame)); |
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157 | |||
158 | frame->type = HDMI_INFOFRAME_TYPE_SPD; |
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159 | frame->version = 1; |
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160 | frame->length = HDMI_SPD_INFOFRAME_SIZE; |
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161 | |||
162 | strncpy(frame->vendor, vendor, sizeof(frame->vendor)); |
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163 | strncpy(frame->product, product, sizeof(frame->product)); |
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164 | |||
165 | return 0; |
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166 | } |
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167 | EXPORT_SYMBOL(hdmi_spd_infoframe_init); |
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168 | |||
169 | /** |
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170 | * hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer |
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171 | * @frame: HDMI SPD infoframe |
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172 | * @buffer: destination buffer |
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173 | * @size: size of buffer |
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174 | * |
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175 | * Packs the information contained in the @frame structure into a binary |
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176 | * representation that can be written into the corresponding controller |
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177 | * registers. Also computes the checksum as required by section 5.3.5 of |
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178 | * the HDMI 1.4 specification. |
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179 | * |
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180 | * Returns the number of bytes packed into the binary buffer or a negative |
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181 | * error code on failure. |
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182 | */ |
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183 | ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer, |
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184 | size_t size) |
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185 | { |
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186 | u8 *ptr = buffer; |
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187 | size_t length; |
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188 | |||
189 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
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190 | |||
191 | if (size < length) |
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192 | return -ENOSPC; |
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193 | |||
194 | memset(buffer, 0, size); |
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195 | |||
196 | ptr[0] = frame->type; |
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197 | ptr[1] = frame->version; |
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198 | ptr[2] = frame->length; |
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199 | ptr[3] = 0; /* checksum */ |
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200 | |||
201 | /* start infoframe payload */ |
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202 | ptr += HDMI_INFOFRAME_HEADER_SIZE; |
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203 | |||
204 | memcpy(ptr, frame->vendor, sizeof(frame->vendor)); |
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205 | memcpy(ptr + 8, frame->product, sizeof(frame->product)); |
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206 | |||
207 | ptr[24] = frame->sdi; |
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208 | |||
209 | hdmi_infoframe_checksum(buffer, length); |
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210 | |||
211 | return length; |
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212 | } |
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213 | EXPORT_SYMBOL(hdmi_spd_infoframe_pack); |
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214 | |||
215 | /** |
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216 | * hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe |
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217 | * @frame: HDMI audio infoframe |
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218 | * |
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219 | * Returns 0 on success or a negative error code on failure. |
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220 | */ |
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221 | int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame) |
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222 | { |
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223 | memset(frame, 0, sizeof(*frame)); |
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224 | |||
225 | frame->type = HDMI_INFOFRAME_TYPE_AUDIO; |
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226 | frame->version = 1; |
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227 | frame->length = HDMI_AUDIO_INFOFRAME_SIZE; |
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228 | |||
229 | return 0; |
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230 | } |
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231 | EXPORT_SYMBOL(hdmi_audio_infoframe_init); |
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232 | |||
233 | /** |
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234 | * hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer |
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235 | * @frame: HDMI audio infoframe |
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236 | * @buffer: destination buffer |
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237 | * @size: size of buffer |
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238 | * |
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239 | * Packs the information contained in the @frame structure into a binary |
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240 | * representation that can be written into the corresponding controller |
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241 | * registers. Also computes the checksum as required by section 5.3.5 of |
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242 | * the HDMI 1.4 specification. |
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243 | * |
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244 | * Returns the number of bytes packed into the binary buffer or a negative |
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245 | * error code on failure. |
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246 | */ |
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247 | ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame, |
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248 | void *buffer, size_t size) |
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249 | { |
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250 | unsigned char channels; |
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251 | u8 *ptr = buffer; |
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252 | size_t length; |
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253 | |||
254 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
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255 | |||
256 | if (size < length) |
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257 | return -ENOSPC; |
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258 | |||
259 | memset(buffer, 0, size); |
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260 | |||
261 | if (frame->channels >= 2) |
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262 | channels = frame->channels - 1; |
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263 | else |
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264 | channels = 0; |
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265 | |||
266 | ptr[0] = frame->type; |
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267 | ptr[1] = frame->version; |
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268 | ptr[2] = frame->length; |
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269 | ptr[3] = 0; /* checksum */ |
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270 | |||
271 | /* start infoframe payload */ |
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272 | ptr += HDMI_INFOFRAME_HEADER_SIZE; |
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273 | |||
274 | ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7); |
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275 | ptr[1] = ((frame->sample_frequency & 0x7) << 2) | |
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276 | (frame->sample_size & 0x3); |
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277 | ptr[2] = frame->coding_type_ext & 0x1f; |
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278 | ptr[3] = frame->channel_allocation; |
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279 | ptr[4] = (frame->level_shift_value & 0xf) << 3; |
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280 | |||
281 | if (frame->downmix_inhibit) |
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282 | ptr[4] |= BIT(7); |
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283 | |||
284 | hdmi_infoframe_checksum(buffer, length); |
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285 | |||
286 | return length; |
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287 | } |
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288 | EXPORT_SYMBOL(hdmi_audio_infoframe_pack); |
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289 | |||
290 | /** |
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291 | * hdmi_vendor_infoframe_init() - initialize an HDMI vendor infoframe |
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292 | * @frame: HDMI vendor infoframe |
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293 | * |
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294 | * Returns 0 on success or a negative error code on failure. |
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295 | */ |
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296 | int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame) |
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297 | { |
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298 | memset(frame, 0, sizeof(*frame)); |
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299 | |||
300 | frame->type = HDMI_INFOFRAME_TYPE_VENDOR; |
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301 | frame->version = 1; |
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302 | |||
303 | frame->oui = HDMI_IEEE_OUI; |
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304 | |||
305 | /* |
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306 | * 0 is a valid value for s3d_struct, so we use a special "not set" |
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307 | * value |
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308 | */ |
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309 | frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID; |
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310 | |||
311 | return 0; |
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312 | } |
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313 | EXPORT_SYMBOL(hdmi_vendor_infoframe_init); |
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314 | |||
315 | /** |
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316 | * hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary buffer |
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317 | * @frame: HDMI infoframe |
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318 | * @buffer: destination buffer |
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319 | * @size: size of buffer |
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320 | * |
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321 | * Packs the information contained in the @frame structure into a binary |
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322 | * representation that can be written into the corresponding controller |
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323 | * registers. Also computes the checksum as required by section 5.3.5 of |
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324 | * the HDMI 1.4 specification. |
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325 | * |
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326 | * Returns the number of bytes packed into the binary buffer or a negative |
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327 | * error code on failure. |
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328 | */ |
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329 | ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame, |
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330 | void *buffer, size_t size) |
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331 | { |
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332 | u8 *ptr = buffer; |
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333 | size_t length; |
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334 | |||
335 | /* empty info frame */ |
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336 | if (frame->vic == 0 && frame->s3d_struct == HDMI_3D_STRUCTURE_INVALID) |
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337 | return -EINVAL; |
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338 | |||
339 | /* only one of those can be supplied */ |
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340 | if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID) |
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341 | return -EINVAL; |
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342 | |||
343 | /* for side by side (half) we also need to provide 3D_Ext_Data */ |
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344 | if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) |
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345 | frame->length = 6; |
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346 | else |
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347 | frame->length = 5; |
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348 | |||
349 | length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; |
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350 | |||
351 | if (size < length) |
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352 | return -ENOSPC; |
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353 | |||
354 | memset(buffer, 0, size); |
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355 | |||
356 | ptr[0] = frame->type; |
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357 | ptr[1] = frame->version; |
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358 | ptr[2] = frame->length; |
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359 | ptr[3] = 0; /* checksum */ |
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360 | |||
361 | /* HDMI OUI */ |
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362 | ptr[4] = 0x03; |
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363 | ptr[5] = 0x0c; |
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364 | ptr[6] = 0x00; |
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365 | |||
366 | if (frame->vic) { |
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367 | ptr[7] = 0x1 << 5; /* video format */ |
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368 | ptr[8] = frame->vic; |
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369 | } else { |
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370 | ptr[7] = 0x2 << 5; /* video format */ |
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371 | ptr[8] = (frame->s3d_struct & 0xf) << 4; |
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372 | if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) |
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373 | ptr[9] = (frame->s3d_ext_data & 0xf) << 4; |
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374 | } |
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375 | |||
376 | hdmi_infoframe_checksum(buffer, length); |
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377 | |||
378 | return length; |
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379 | } |
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380 | EXPORT_SYMBOL(hdmi_vendor_infoframe_pack); |
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381 | |||
382 | /* |
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383 | * hdmi_vendor_any_infoframe_pack() - write a vendor infoframe to binary buffer |
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384 | */ |
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385 | static ssize_t |
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386 | hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame, |
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387 | void *buffer, size_t size) |
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388 | { |
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389 | /* we only know about HDMI vendor infoframes */ |
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390 | if (frame->any.oui != HDMI_IEEE_OUI) |
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391 | return -EINVAL; |
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392 | |||
393 | return hdmi_vendor_infoframe_pack(&frame->hdmi, buffer, size); |
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394 | } |
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395 | |||
396 | /** |
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397 | * hdmi_infoframe_pack() - write a HDMI infoframe to binary buffer |
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398 | * @frame: HDMI infoframe |
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399 | * @buffer: destination buffer |
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400 | * @size: size of buffer |
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401 | * |
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402 | * Packs the information contained in the @frame structure into a binary |
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403 | * representation that can be written into the corresponding controller |
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404 | * registers. Also computes the checksum as required by section 5.3.5 of |
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405 | * the HDMI 1.4 specification. |
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406 | * |
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407 | * Returns the number of bytes packed into the binary buffer or a negative |
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408 | * error code on failure. |
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409 | */ |
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410 | ssize_t |
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411 | hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size) |
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412 | { |
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413 | ssize_t length; |
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414 | |||
415 | switch (frame->any.type) { |
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416 | case HDMI_INFOFRAME_TYPE_AVI: |
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417 | length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size); |
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418 | break; |
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419 | case HDMI_INFOFRAME_TYPE_SPD: |
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420 | length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size); |
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421 | break; |
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422 | case HDMI_INFOFRAME_TYPE_AUDIO: |
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423 | length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size); |
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424 | break; |
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425 | case HDMI_INFOFRAME_TYPE_VENDOR: |
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426 | length = hdmi_vendor_any_infoframe_pack(&frame->vendor, |
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427 | buffer, size); |
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428 | break; |
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429 | default: |
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430 | WARN(1, "Bad infoframe type %d\n", frame->any.type); |
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431 | length = -EINVAL; |
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432 | } |
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433 | |||
434 | return length; |
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435 | } |
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436 | EXPORT_SYMBOL(hdmi_infoframe_pack);><>><>><>><>>><>><>><>>>><>><>><>><>><>><>><>>> |