video: Add generic HDMI infoframe helpers
Add generic helpers to pack HDMI infoframes into binary buffers. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Thierry Reding
Родитель
595887eb90
Коммит
f142d3bd55
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@ -52,6 +52,9 @@ config OF_VIDEOMODE
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help
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helper to get videomodes from the devicetree
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config HDMI
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bool
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menuconfig FB
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tristate "Support for frame buffer devices"
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---help---
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@ -5,6 +5,7 @@
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# Each configuration option enables a list of files.
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obj-$(CONFIG_VGASTATE) += vgastate.o
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obj-$(CONFIG_HDMI) += hdmi.o
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obj-y += fb_notify.o
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obj-$(CONFIG_FB) += fb.o
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fb-y := fbmem.o fbmon.o fbcmap.o fbsysfs.o \
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@ -0,0 +1,308 @@
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/*
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* Copyright (C) 2012 Avionic Design GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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@ -0,0 +1,231 @@
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/*
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* Copyright (C) 2012 Avionic Design GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __LINUX_HDMI_H_
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#define __LINUX_HDMI_H_
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#include <linux/types.h>
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enum hdmi_infoframe_type {
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HDMI_INFOFRAME_TYPE_VENDOR = 0x81,
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HDMI_INFOFRAME_TYPE_AVI = 0x82,
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HDMI_INFOFRAME_TYPE_SPD = 0x83,
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HDMI_INFOFRAME_TYPE_AUDIO = 0x84,
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};
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#define HDMI_INFOFRAME_HEADER_SIZE 4
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#define HDMI_AVI_INFOFRAME_SIZE 13
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#define HDMI_SPD_INFOFRAME_SIZE 25
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#define HDMI_AUDIO_INFOFRAME_SIZE 10
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enum hdmi_colorspace {
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HDMI_COLORSPACE_RGB,
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HDMI_COLORSPACE_YUV422,
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HDMI_COLORSPACE_YUV444,
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};
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enum hdmi_scan_mode {
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HDMI_SCAN_MODE_NONE,
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HDMI_SCAN_MODE_OVERSCAN,
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HDMI_SCAN_MODE_UNDERSCAN,
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};
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enum hdmi_colorimetry {
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HDMI_COLORIMETRY_NONE,
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HDMI_COLORIMETRY_ITU_601,
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HDMI_COLORIMETRY_ITU_709,
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HDMI_COLORIMETRY_EXTENDED,
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};
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enum hdmi_picture_aspect {
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HDMI_PICTURE_ASPECT_NONE,
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HDMI_PICTURE_ASPECT_4_3,
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HDMI_PICTURE_ASPECT_16_9,
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};
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enum hdmi_active_aspect {
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HDMI_ACTIVE_ASPECT_16_9_TOP = 2,
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HDMI_ACTIVE_ASPECT_14_9_TOP = 3,
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HDMI_ACTIVE_ASPECT_16_9_CENTER = 4,
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HDMI_ACTIVE_ASPECT_PICTURE = 8,
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HDMI_ACTIVE_ASPECT_4_3 = 9,
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HDMI_ACTIVE_ASPECT_16_9 = 10,
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HDMI_ACTIVE_ASPECT_14_9 = 11,
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HDMI_ACTIVE_ASPECT_4_3_SP_14_9 = 13,
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HDMI_ACTIVE_ASPECT_16_9_SP_14_9 = 14,
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HDMI_ACTIVE_ASPECT_16_9_SP_4_3 = 15,
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};
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enum hdmi_extended_colorimetry {
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HDMI_EXTENDED_COLORIMETRY_XV_YCC_601,
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HDMI_EXTENDED_COLORIMETRY_XV_YCC_709,
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HDMI_EXTENDED_COLORIMETRY_S_YCC_601,
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HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601,
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HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB,
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};
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enum hdmi_quantization_range {
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HDMI_QUANTIZATION_RANGE_DEFAULT,
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HDMI_QUANTIZATION_RANGE_LIMITED,
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HDMI_QUANTIZATION_RANGE_FULL,
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};
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/* non-uniform picture scaling */
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enum hdmi_nups {
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HDMI_NUPS_UNKNOWN,
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HDMI_NUPS_HORIZONTAL,
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HDMI_NUPS_VERTICAL,
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HDMI_NUPS_BOTH,
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};
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enum hdmi_ycc_quantization_range {
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HDMI_YCC_QUANTIZATION_RANGE_LIMITED,
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HDMI_YCC_QUANTIZATION_RANGE_FULL,
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};
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enum hdmi_content_type {
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HDMI_CONTENT_TYPE_NONE,
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HDMI_CONTENT_TYPE_PHOTO,
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HDMI_CONTENT_TYPE_CINEMA,
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HDMI_CONTENT_TYPE_GAME,
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};
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struct hdmi_avi_infoframe {
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enum hdmi_infoframe_type type;
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unsigned char version;
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unsigned char length;
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enum hdmi_colorspace colorspace;
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bool active_info_valid;
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bool horizontal_bar_valid;
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bool vertical_bar_valid;
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enum hdmi_scan_mode scan_mode;
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enum hdmi_colorimetry colorimetry;
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enum hdmi_picture_aspect picture_aspect;
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enum hdmi_active_aspect active_aspect;
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bool itc;
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enum hdmi_extended_colorimetry extended_colorimetry;
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enum hdmi_quantization_range quantization_range;
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enum hdmi_nups nups;
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unsigned char video_code;
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enum hdmi_ycc_quantization_range ycc_quantization_range;
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enum hdmi_content_type content_type;
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unsigned char pixel_repeat;
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unsigned short top_bar;
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unsigned short bottom_bar;
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unsigned short left_bar;
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unsigned short right_bar;
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};
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int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame);
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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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enum hdmi_spd_sdi {
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HDMI_SPD_SDI_UNKNOWN,
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HDMI_SPD_SDI_DSTB,
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HDMI_SPD_SDI_DVDP,
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HDMI_SPD_SDI_DVHS,
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HDMI_SPD_SDI_HDDVR,
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HDMI_SPD_SDI_DVC,
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HDMI_SPD_SDI_DSC,
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HDMI_SPD_SDI_VCD,
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HDMI_SPD_SDI_GAME,
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HDMI_SPD_SDI_PC,
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HDMI_SPD_SDI_BD,
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HDMI_SPD_SDI_SACD,
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HDMI_SPD_SDI_HDDVD,
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HDMI_SPD_SDI_PMP,
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};
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struct hdmi_spd_infoframe {
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enum hdmi_infoframe_type type;
|
||||
unsigned char version;
|
||||
unsigned char length;
|
||||
char vendor[8];
|
||||
char product[16];
|
||||
enum hdmi_spd_sdi sdi;
|
||||
};
|
||||
|
||||
int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
|
||||
const char *vendor, const char *product);
|
||||
ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
|
||||
size_t size);
|
||||
|
||||
enum hdmi_audio_coding_type {
|
||||
HDMI_AUDIO_CODING_TYPE_STREAM,
|
||||
HDMI_AUDIO_CODING_TYPE_PCM,
|
||||
HDMI_AUDIO_CODING_TYPE_AC3,
|
||||
HDMI_AUDIO_CODING_TYPE_MPEG1,
|
||||
HDMI_AUDIO_CODING_TYPE_MP3,
|
||||
HDMI_AUDIO_CODING_TYPE_MPEG2,
|
||||
HDMI_AUDIO_CODING_TYPE_AAC_LC,
|
||||
HDMI_AUDIO_CODING_TYPE_DTS,
|
||||
HDMI_AUDIO_CODING_TYPE_ATRAC,
|
||||
HDMI_AUDIO_CODING_TYPE_DSD,
|
||||
HDMI_AUDIO_CODING_TYPE_EAC3,
|
||||
HDMI_AUDIO_CODING_TYPE_DTS_HD,
|
||||
HDMI_AUDIO_CODING_TYPE_MLP,
|
||||
HDMI_AUDIO_CODING_TYPE_DST,
|
||||
HDMI_AUDIO_CODING_TYPE_WMA_PRO,
|
||||
};
|
||||
|
||||
enum hdmi_audio_sample_size {
|
||||
HDMI_AUDIO_SAMPLE_SIZE_STREAM,
|
||||
HDMI_AUDIO_SAMPLE_SIZE_16,
|
||||
HDMI_AUDIO_SAMPLE_SIZE_20,
|
||||
HDMI_AUDIO_SAMPLE_SIZE_24,
|
||||
};
|
||||
|
||||
enum hdmi_audio_sample_frequency {
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_32000,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_44100,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_48000,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_88200,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_96000,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_176400,
|
||||
HDMI_AUDIO_SAMPLE_FREQUENCY_192000,
|
||||
};
|
||||
|
||||
enum hdmi_audio_coding_type_ext {
|
||||
HDMI_AUDIO_CODING_TYPE_EXT_STREAM,
|
||||
HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC,
|
||||
HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2,
|
||||
HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND,
|
||||
};
|
||||
|
||||
struct hdmi_audio_infoframe {
|
||||
enum hdmi_infoframe_type type;
|
||||
unsigned char version;
|
||||
unsigned char length;
|
||||
unsigned char channels;
|
||||
enum hdmi_audio_coding_type coding_type;
|
||||
enum hdmi_audio_sample_size sample_size;
|
||||
enum hdmi_audio_sample_frequency sample_frequency;
|
||||
enum hdmi_audio_coding_type_ext coding_type_ext;
|
||||
unsigned char channel_allocation;
|
||||
unsigned char level_shift_value;
|
||||
bool downmix_inhibit;
|
||||
|
||||
};
|
||||
|
||||
int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame);
|
||||
ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
|
||||
void *buffer, size_t size);
|
||||
|
||||
struct hdmi_vendor_infoframe {
|
||||
enum hdmi_infoframe_type type;
|
||||
unsigned char version;
|
||||
unsigned char length;
|
||||
u8 data[27];
|
||||
};
|
||||
|
||||
ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
|
||||
void *buffer, size_t size);
|
||||
|
||||
#endif /* _DRM_HDMI_H */
|
||||
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