video: Add generic HDMI infoframe helpers (f142d3bd) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/video/Kconfig

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		@@ -52,6 +52,9 @@ config OF_VIDEOMODE
		help
		helper to get videomodes from the devicetree

		config HDMI
		bool

		menuconfig FB
		tristate "Support for frame buffer devices"
		---help---

drivers/video/Makefile

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Original line number	Diff line number	Diff line
		@@ -5,6 +5,7 @@
		# Each configuration option enables a list of files.

		obj-$(CONFIG_VGASTATE) += vgastate.o
		obj-$(CONFIG_HDMI) += hdmi.o
		obj-y += fb_notify.o
		obj-$(CONFIG_FB) += fb.o
		fb-y := fbmem.o fbmon.o fbcmap.o fbsysfs.o \

drivers/video/hdmi.c

0 → 100644

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		/*
		* Copyright (C) 2012 Avionic Design GmbH
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/bitops.h>
		#include <linux/errno.h>
		#include <linux/export.h>
		#include <linux/hdmi.h>
		#include <linux/string.h>

		static void hdmi_infoframe_checksum(void *buffer, size_t size)
		{
		u8 *ptr = buffer;
		u8 csum = 0;
		size_t i;

		/* compute checksum */
		for (i = 0; i < size; i++)
		csum += ptr[i];

		ptr[3] = 256 - csum;
		}

		/**
		* hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
		* @frame: HDMI AVI infoframe
		*
		* Returns 0 on success or a negative error code on failure.
		*/
		int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
		{
		memset(frame, 0, sizeof(*frame));

		frame->type = HDMI_INFOFRAME_TYPE_AVI;
		frame->version = 2;
		frame->length = 13;

		return 0;
		}
		EXPORT_SYMBOL(hdmi_avi_infoframe_init);

		/**
		* hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer
		* @frame: HDMI AVI infoframe
		* @buffer: destination buffer
		* @size: size of buffer
		*
		* Packs the information contained in the @frame structure into a binary
		* representation that can be written into the corresponding controller
		* registers. Also computes the checksum as required by section 5.3.5 of
		* the HDMI 1.4 specification.
		*
		* Returns the number of bytes packed into the binary buffer or a negative
		* error code on failure.
		*/
		ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe frame, void buffer,
		size_t size)
		{
		u8 *ptr = buffer;
		size_t length;

		length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

		if (size < length)
		return -ENOSPC;

		memset(buffer, 0, length);

		ptr[0] = frame->type;
		ptr[1] = frame->version;
		ptr[2] = frame->length;
		ptr[3] = 0; /* checksum */

		/* start infoframe payload */
		ptr += HDMI_INFOFRAME_HEADER_SIZE;

		ptr[0] = ((frame->colorspace & 0x3) << 5) \| (frame->scan_mode & 0x3);

		if (frame->active_info_valid)
		ptr[0] \|= BIT(4);

		if (frame->horizontal_bar_valid)
		ptr[0] \|= BIT(3);

		if (frame->vertical_bar_valid)
		ptr[0] \|= BIT(2);

		ptr[1] = ((frame->colorimetry & 0x3) << 6) \|
		((frame->picture_aspect & 0x3) << 4) \|
		(frame->active_aspect & 0xf);

		ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) \|
		((frame->quantization_range & 0x3) << 2) \|
		(frame->nups & 0x3);

		if (frame->itc)
		ptr[2] \|= BIT(7);

		ptr[3] = frame->video_code & 0x7f;

		ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) \|
		((frame->content_type & 0x3) << 4) \|
		(frame->pixel_repeat & 0xf);

		ptr[5] = frame->top_bar & 0xff;
		ptr[6] = (frame->top_bar >> 8) & 0xff;
		ptr[7] = frame->bottom_bar & 0xff;
		ptr[8] = (frame->bottom_bar >> 8) & 0xff;
		ptr[9] = frame->left_bar & 0xff;
		ptr[10] = (frame->left_bar >> 8) & 0xff;
		ptr[11] = frame->right_bar & 0xff;
		ptr[12] = (frame->right_bar >> 8) & 0xff;

		hdmi_infoframe_checksum(buffer, length);

		return length;
		}
		EXPORT_SYMBOL(hdmi_avi_infoframe_pack);

		/**
		* hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
		* @frame: HDMI SPD infoframe
		* @vendor: vendor string
		* @product: product string
		*
		* Returns 0 on success or a negative error code on failure.
		*/
		int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
		const char vendor, const char product)
		{
		memset(frame, 0, sizeof(*frame));

		frame->type = HDMI_INFOFRAME_TYPE_SPD;
		frame->version = 1;
		frame->length = 25;

		strncpy(frame->vendor, vendor, sizeof(frame->vendor));
		strncpy(frame->product, product, sizeof(frame->product));

		return 0;
		}
		EXPORT_SYMBOL(hdmi_spd_infoframe_init);

		/**
		* hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer
		* @frame: HDMI SPD infoframe
		* @buffer: destination buffer
		* @size: size of buffer
		*
		* Packs the information contained in the @frame structure into a binary
		* representation that can be written into the corresponding controller
		* registers. Also computes the checksum as required by section 5.3.5 of
		* the HDMI 1.4 specification.
		*
		* Returns the number of bytes packed into the binary buffer or a negative
		* error code on failure.
		*/
		ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe frame, void buffer,
		size_t size)
		{
		u8 *ptr = buffer;
		size_t length;

		length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

		if (size < length)
		return -ENOSPC;

		memset(buffer, 0, length);

		ptr[0] = frame->type;
		ptr[1] = frame->version;
		ptr[2] = frame->length;
		ptr[3] = 0; /* checksum */

		/* start infoframe payload */
		ptr += HDMI_INFOFRAME_HEADER_SIZE;

		memcpy(ptr, frame->vendor, sizeof(frame->vendor));
		memcpy(ptr + 8, frame->product, sizeof(frame->product));

		ptr[24] = frame->sdi;

		hdmi_infoframe_checksum(buffer, length);

		return length;
		}
		EXPORT_SYMBOL(hdmi_spd_infoframe_pack);

		/**
		* hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
		* @frame: HDMI audio infoframe
		*
		* Returns 0 on success or a negative error code on failure.
		*/
		int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
		{
		memset(frame, 0, sizeof(*frame));

		frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
		frame->version = 1;
		frame->length = 10;

		return 0;
		}
		EXPORT_SYMBOL(hdmi_audio_infoframe_init);

		/**
		* hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer
		* @frame: HDMI audio infoframe
		* @buffer: destination buffer
		* @size: size of buffer
		*
		* Packs the information contained in the @frame structure into a binary
		* representation that can be written into the corresponding controller
		* registers. Also computes the checksum as required by section 5.3.5 of
		* the HDMI 1.4 specification.
		*
		* Returns the number of bytes packed into the binary buffer or a negative
		* error code on failure.
		*/
		ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
		void *buffer, size_t size)
		{
		unsigned char channels;
		u8 *ptr = buffer;
		size_t length;

		length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

		if (size < length)
		return -ENOSPC;

		memset(buffer, 0, length);

		if (frame->channels >= 2)
		channels = frame->channels - 1;
		else
		channels = 0;

		ptr[0] = frame->type;
		ptr[1] = frame->version;
		ptr[2] = frame->length;
		ptr[3] = 0; /* checksum */

		/* start infoframe payload */
		ptr += HDMI_INFOFRAME_HEADER_SIZE;

		ptr[0] = ((frame->coding_type & 0xf) << 4) \| (channels & 0x7);
		ptr[1] = ((frame->sample_frequency & 0x7) << 2) \|
		(frame->sample_size & 0x3);
		ptr[2] = frame->coding_type_ext & 0x1f;
		ptr[3] = frame->channel_allocation;
		ptr[4] = (frame->level_shift_value & 0xf) << 3;

		if (frame->downmix_inhibit)
		ptr[4] \|= BIT(7);

		hdmi_infoframe_checksum(buffer, length);

		return length;
		}
		EXPORT_SYMBOL(hdmi_audio_infoframe_pack);

		/**
		* hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary
		* buffer
		* @frame: HDMI vendor infoframe
		* @buffer: destination buffer
		* @size: size of buffer
		*
		* Packs the information contained in the @frame structure into a binary
		* representation that can be written into the corresponding controller
		* registers. Also computes the checksum as required by section 5.3.5 of
		* the HDMI 1.4 specification.
		*
		* Returns the number of bytes packed into the binary buffer or a negative
		* error code on failure.
		*/
		ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
		void *buffer, size_t size)
		{
		u8 *ptr = buffer;
		size_t length;

		length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

		if (size < length)
		return -ENOSPC;

		memset(buffer, 0, length);

		ptr[0] = frame->type;
		ptr[1] = frame->version;
		ptr[2] = frame->length;
		ptr[3] = 0; /* checksum */

		memcpy(&ptr[HDMI_INFOFRAME_HEADER_SIZE], frame->data, frame->length);

		hdmi_infoframe_checksum(buffer, length);

		return length;
		}
		EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);

include/linux/hdmi.h

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		/*
		* Copyright (C) 2012 Avionic Design GmbH
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#ifndef __LINUX_HDMI_H_
		#define __LINUX_HDMI_H_

		#include <linux/types.h>

		enum hdmi_infoframe_type {
		HDMI_INFOFRAME_TYPE_VENDOR = 0x81,
		HDMI_INFOFRAME_TYPE_AVI = 0x82,
		HDMI_INFOFRAME_TYPE_SPD = 0x83,
		HDMI_INFOFRAME_TYPE_AUDIO = 0x84,
		};

		#define HDMI_INFOFRAME_HEADER_SIZE 4
		#define HDMI_AVI_INFOFRAME_SIZE 13
		#define HDMI_SPD_INFOFRAME_SIZE 25
		#define HDMI_AUDIO_INFOFRAME_SIZE 10

		enum hdmi_colorspace {
		HDMI_COLORSPACE_RGB,
		HDMI_COLORSPACE_YUV422,
		HDMI_COLORSPACE_YUV444,
		};

		enum hdmi_scan_mode {
		HDMI_SCAN_MODE_NONE,
		HDMI_SCAN_MODE_OVERSCAN,
		HDMI_SCAN_MODE_UNDERSCAN,
		};

		enum hdmi_colorimetry {
		HDMI_COLORIMETRY_NONE,
		HDMI_COLORIMETRY_ITU_601,
		HDMI_COLORIMETRY_ITU_709,
		HDMI_COLORIMETRY_EXTENDED,
		};

		enum hdmi_picture_aspect {
		HDMI_PICTURE_ASPECT_NONE,
		HDMI_PICTURE_ASPECT_4_3,
		HDMI_PICTURE_ASPECT_16_9,
		};

		enum hdmi_active_aspect {
		HDMI_ACTIVE_ASPECT_16_9_TOP = 2,
		HDMI_ACTIVE_ASPECT_14_9_TOP = 3,
		HDMI_ACTIVE_ASPECT_16_9_CENTER = 4,
		HDMI_ACTIVE_ASPECT_PICTURE = 8,
		HDMI_ACTIVE_ASPECT_4_3 = 9,
		HDMI_ACTIVE_ASPECT_16_9 = 10,
		HDMI_ACTIVE_ASPECT_14_9 = 11,
		HDMI_ACTIVE_ASPECT_4_3_SP_14_9 = 13,
		HDMI_ACTIVE_ASPECT_16_9_SP_14_9 = 14,
		HDMI_ACTIVE_ASPECT_16_9_SP_4_3 = 15,
		};

		enum hdmi_extended_colorimetry {
		HDMI_EXTENDED_COLORIMETRY_XV_YCC_601,
		HDMI_EXTENDED_COLORIMETRY_XV_YCC_709,
		HDMI_EXTENDED_COLORIMETRY_S_YCC_601,
		HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601,
		HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB,
		};

		enum hdmi_quantization_range {
		HDMI_QUANTIZATION_RANGE_DEFAULT,
		HDMI_QUANTIZATION_RANGE_LIMITED,
		HDMI_QUANTIZATION_RANGE_FULL,
		};

		/* non-uniform picture scaling */
		enum hdmi_nups {
		HDMI_NUPS_UNKNOWN,
		HDMI_NUPS_HORIZONTAL,
		HDMI_NUPS_VERTICAL,
		HDMI_NUPS_BOTH,
		};

		enum hdmi_ycc_quantization_range {
		HDMI_YCC_QUANTIZATION_RANGE_LIMITED,
		HDMI_YCC_QUANTIZATION_RANGE_FULL,
		};

		enum hdmi_content_type {
		HDMI_CONTENT_TYPE_NONE,
		HDMI_CONTENT_TYPE_PHOTO,
		HDMI_CONTENT_TYPE_CINEMA,
		HDMI_CONTENT_TYPE_GAME,
		};

		struct hdmi_avi_infoframe {
		enum hdmi_infoframe_type type;
		unsigned char version;
		unsigned char length;
		enum hdmi_colorspace colorspace;
		bool active_info_valid;
		bool horizontal_bar_valid;
		bool vertical_bar_valid;
		enum hdmi_scan_mode scan_mode;
		enum hdmi_colorimetry colorimetry;
		enum hdmi_picture_aspect picture_aspect;
		enum hdmi_active_aspect active_aspect;
		bool itc;
		enum hdmi_extended_colorimetry extended_colorimetry;
		enum hdmi_quantization_range quantization_range;
		enum hdmi_nups nups;
		unsigned char video_code;
		enum hdmi_ycc_quantization_range ycc_quantization_range;
		enum hdmi_content_type content_type;
		unsigned char pixel_repeat;
		unsigned short top_bar;
		unsigned short bottom_bar;
		unsigned short left_bar;
		unsigned short right_bar;
		};

		int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame);
		ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe frame, void buffer,
		size_t size);

		enum hdmi_spd_sdi {
		HDMI_SPD_SDI_UNKNOWN,
		HDMI_SPD_SDI_DSTB,
		HDMI_SPD_SDI_DVDP,
		HDMI_SPD_SDI_DVHS,
		HDMI_SPD_SDI_HDDVR,
		HDMI_SPD_SDI_DVC,
		HDMI_SPD_SDI_DSC,
		HDMI_SPD_SDI_VCD,
		HDMI_SPD_SDI_GAME,
		HDMI_SPD_SDI_PC,
		HDMI_SPD_SDI_BD,
		HDMI_SPD_SDI_SACD,
		HDMI_SPD_SDI_HDDVD,
		HDMI_SPD_SDI_PMP,
		};

		struct hdmi_spd_infoframe {
		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 */