96d672e0e5
In order to make it easier to port the code to other operating systems (like the BSDs), relicense the HDMI helpers under the more permissive MIT license. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Dave Airlie <airlied@redhat.com>
323 lines
8.6 KiB
C
323 lines
8.6 KiB
C
/*
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* Copyright (C) 2012 Avionic Design GmbH
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/hdmi.h>
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#include <linux/string.h>
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static void hdmi_infoframe_checksum(void *buffer, size_t size)
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{
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u8 *ptr = buffer;
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u8 csum = 0;
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size_t i;
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/* compute checksum */
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for (i = 0; i < size; i++)
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csum += ptr[i];
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ptr[3] = 256 - csum;
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}
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/**
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* hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
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* @frame: HDMI AVI infoframe
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*
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* Returns 0 on success or a negative error code on failure.
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*/
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int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
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{
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memset(frame, 0, sizeof(*frame));
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frame->type = HDMI_INFOFRAME_TYPE_AVI;
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frame->version = 2;
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frame->length = 13;
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return 0;
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}
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EXPORT_SYMBOL(hdmi_avi_infoframe_init);
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/**
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* hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer
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* @frame: HDMI AVI infoframe
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* @buffer: destination buffer
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* @size: size of buffer
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*
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* Packs the information contained in the @frame structure into a binary
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* representation that can be written into the corresponding controller
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* registers. Also computes the checksum as required by section 5.3.5 of
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* the HDMI 1.4 specification.
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*
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* Returns the number of bytes packed into the binary buffer or a negative
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* error code on failure.
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*/
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ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,
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size_t size)
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{
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u8 *ptr = buffer;
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size_t length;
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length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
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if (size < length)
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return -ENOSPC;
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memset(buffer, 0, length);
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ptr[0] = frame->type;
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ptr[1] = frame->version;
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ptr[2] = frame->length;
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ptr[3] = 0; /* checksum */
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/* start infoframe payload */
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ptr += HDMI_INFOFRAME_HEADER_SIZE;
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ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);
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if (frame->active_info_valid)
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ptr[0] |= BIT(4);
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if (frame->horizontal_bar_valid)
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ptr[0] |= BIT(3);
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if (frame->vertical_bar_valid)
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ptr[0] |= BIT(2);
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ptr[1] = ((frame->colorimetry & 0x3) << 6) |
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((frame->picture_aspect & 0x3) << 4) |
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(frame->active_aspect & 0xf);
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ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) |
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((frame->quantization_range & 0x3) << 2) |
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(frame->nups & 0x3);
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if (frame->itc)
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ptr[2] |= BIT(7);
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ptr[3] = frame->video_code & 0x7f;
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ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) |
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((frame->content_type & 0x3) << 4) |
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(frame->pixel_repeat & 0xf);
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ptr[5] = frame->top_bar & 0xff;
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ptr[6] = (frame->top_bar >> 8) & 0xff;
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ptr[7] = frame->bottom_bar & 0xff;
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ptr[8] = (frame->bottom_bar >> 8) & 0xff;
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ptr[9] = frame->left_bar & 0xff;
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ptr[10] = (frame->left_bar >> 8) & 0xff;
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ptr[11] = frame->right_bar & 0xff;
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ptr[12] = (frame->right_bar >> 8) & 0xff;
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hdmi_infoframe_checksum(buffer, length);
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return length;
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}
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EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
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/**
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* hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
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* @frame: HDMI SPD infoframe
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* @vendor: vendor string
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* @product: product string
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*
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* Returns 0 on success or a negative error code on failure.
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*/
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int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
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const char *vendor, const char *product)
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{
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memset(frame, 0, sizeof(*frame));
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frame->type = HDMI_INFOFRAME_TYPE_SPD;
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frame->version = 1;
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frame->length = 25;
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strncpy(frame->vendor, vendor, sizeof(frame->vendor));
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strncpy(frame->product, product, sizeof(frame->product));
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return 0;
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}
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EXPORT_SYMBOL(hdmi_spd_infoframe_init);
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/**
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* hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer
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* @frame: HDMI SPD infoframe
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* @buffer: destination buffer
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* @size: size of buffer
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*
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* Packs the information contained in the @frame structure into a binary
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* representation that can be written into the corresponding controller
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* registers. Also computes the checksum as required by section 5.3.5 of
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* the HDMI 1.4 specification.
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*
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* Returns the number of bytes packed into the binary buffer or a negative
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* error code on failure.
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*/
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ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
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size_t size)
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{
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u8 *ptr = buffer;
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size_t length;
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length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
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if (size < length)
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return -ENOSPC;
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memset(buffer, 0, length);
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ptr[0] = frame->type;
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ptr[1] = frame->version;
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ptr[2] = frame->length;
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ptr[3] = 0; /* checksum */
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/* start infoframe payload */
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ptr += HDMI_INFOFRAME_HEADER_SIZE;
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memcpy(ptr, frame->vendor, sizeof(frame->vendor));
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memcpy(ptr + 8, frame->product, sizeof(frame->product));
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ptr[24] = frame->sdi;
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hdmi_infoframe_checksum(buffer, length);
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return length;
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}
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EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
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/**
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* hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
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* @frame: HDMI audio infoframe
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*
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* Returns 0 on success or a negative error code on failure.
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*/
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int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
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{
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memset(frame, 0, sizeof(*frame));
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frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
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frame->version = 1;
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frame->length = 10;
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return 0;
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}
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EXPORT_SYMBOL(hdmi_audio_infoframe_init);
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/**
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* hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer
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* @frame: HDMI audio infoframe
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* @buffer: destination buffer
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* @size: size of buffer
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*
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* Packs the information contained in the @frame structure into a binary
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* representation that can be written into the corresponding controller
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* registers. Also computes the checksum as required by section 5.3.5 of
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* the HDMI 1.4 specification.
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*
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* Returns the number of bytes packed into the binary buffer or a negative
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* error code on failure.
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*/
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ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
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void *buffer, size_t size)
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{
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unsigned char channels;
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u8 *ptr = buffer;
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size_t length;
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length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
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if (size < length)
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return -ENOSPC;
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memset(buffer, 0, length);
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if (frame->channels >= 2)
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channels = frame->channels - 1;
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else
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channels = 0;
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ptr[0] = frame->type;
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ptr[1] = frame->version;
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ptr[2] = frame->length;
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ptr[3] = 0; /* checksum */
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/* start infoframe payload */
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ptr += HDMI_INFOFRAME_HEADER_SIZE;
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ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
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ptr[1] = ((frame->sample_frequency & 0x7) << 2) |
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(frame->sample_size & 0x3);
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ptr[2] = frame->coding_type_ext & 0x1f;
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ptr[3] = frame->channel_allocation;
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ptr[4] = (frame->level_shift_value & 0xf) << 3;
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if (frame->downmix_inhibit)
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ptr[4] |= BIT(7);
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hdmi_infoframe_checksum(buffer, length);
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return length;
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}
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EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
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/**
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* hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary
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* buffer
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* @frame: HDMI vendor infoframe
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* @buffer: destination buffer
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* @size: size of buffer
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*
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* Packs the information contained in the @frame structure into a binary
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* representation that can be written into the corresponding controller
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* registers. Also computes the checksum as required by section 5.3.5 of
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* the HDMI 1.4 specification.
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*
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* Returns the number of bytes packed into the binary buffer or a negative
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* error code on failure.
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*/
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ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
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void *buffer, size_t size)
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{
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u8 *ptr = buffer;
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size_t length;
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length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
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if (size < length)
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return -ENOSPC;
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memset(buffer, 0, length);
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ptr[0] = frame->type;
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ptr[1] = frame->version;
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ptr[2] = frame->length;
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ptr[3] = 0; /* checksum */
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memcpy(&ptr[HDMI_INFOFRAME_HEADER_SIZE], frame->data, frame->length);
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hdmi_infoframe_checksum(buffer, length);
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return length;
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}
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EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
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