path: root/drivers/video/hdmi.c

/*
 * Copyright (C) 2012 Avionic Design GmbH
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

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

#define hdmi_log(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)

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

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

	return 256 - csum;
}

static void hdmi_infoframe_set_checksum(void *buffer, size_t size)
{
	u8 *ptr = buffer;

	ptr[3] = hdmi_infoframe_checksum(buffer, size);
}

/**
 * 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 = HDMI_AVI_INFOFRAME_SIZE;

	return 0;
}
EXPORT_SYMBOL(hdmi_avi_infoframe_init);

static int hdmi_avi_infoframe_check_only(const struct hdmi_avi_infoframe *frame)
{
	if (frame->type != HDMI_INFOFRAME_TYPE_AVI ||
	    frame->version != 2 ||
	    frame->length != HDMI_AVI_INFOFRAME_SIZE)
		return -EINVAL;

	if (frame->picture_aspect > HDMI_PICTURE_ASPECT_16_9)
		return -EINVAL;

	return 0;
}

/**
 * hdmi_avi_infoframe_check() - check a HDMI AVI infoframe
 * @frame: HDMI AVI infoframe
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields.
 *
 * Returns 0 on success or a negative error code on failure.
 */
int hdmi_avi_infoframe_check(struct hdmi_avi_infoframe *frame)
{
	return hdmi_avi_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_avi_infoframe_check);

/**
 * hdmi_avi_infoframe_pack_only() - 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_only(const struct hdmi_avi_infoframe *frame,
				     void *buffer, size_t size)
{
	u8 *ptr = buffer;
	size_t length;
	int ret;

	ret = hdmi_avi_infoframe_check_only(frame);
	if (ret)
		return ret;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)
		return -ENOSPC;

	memset(buffer, 0, size);

	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);

	/*
	 * Data byte 1, bit 4 has to be set if we provide the active format
	 * aspect ratio
	 */
	if (frame->active_aspect & 0xf)
		ptr[0] |= BIT(4);

	/* Bit 3 and 2 indicate if we transmit horizontal/vertical bar data */
	if (frame->top_bar || frame->bottom_bar)
		ptr[0] |= BIT(3);

	if (frame->left_bar || frame->right_bar)
		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_set_checksum(buffer, length);

	return length;
}
EXPORT_SYMBOL(hdmi_avi_infoframe_pack_only);

/**
 * hdmi_avi_infoframe_pack() - check a HDMI AVI infoframe,
 *                             and write it to binary buffer
 * @frame: HDMI AVI infoframe
 * @buffer: destination buffer
 * @size: size of buffer
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields, after which it packs the information
 * contained in the @frame structure into a binary representation that
 * can be written into the corresponding controller registers. This function
 * 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)
{
	int ret;

	ret = hdmi_avi_infoframe_check(frame);
	if (ret)
		return ret;

	return hdmi_avi_infoframe_pack_only(frame, buffer, size);
}
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 = HDMI_SPD_INFOFRAME_SIZE;

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

	return 0;
}
EXPORT_SYMBOL(hdmi_spd_infoframe_init);

static int hdmi_spd_infoframe_check_only(const struct hdmi_spd_infoframe *frame)
{
	if (frame->type != HDMI_INFOFRAME_TYPE_SPD ||
	    frame->version != 1 ||
	    frame->length != HDMI_SPD_INFOFRAME_SIZE)
		return -EINVAL;

	return 0;
}

/**
 * hdmi_spd_infoframe_check() - check a HDMI SPD infoframe
 * @frame: HDMI SPD infoframe
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields.
 *
 * Returns 0 on success or a negative error code on failure.
 */
int hdmi_spd_infoframe_check(struct hdmi_spd_infoframe *frame)
{
	return hdmi_spd_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_spd_infoframe_check);

/**
 * hdmi_spd_infoframe_pack_only() - 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_only(const struct hdmi_spd_infoframe *frame,
				     void *buffer, size_t size)
{
	u8 *ptr = buffer;
	size_t length;
	int ret;

	ret = hdmi_spd_infoframe_check_only(frame);
	if (ret)
		return ret;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)
		return -ENOSPC;

	memset(buffer, 0, size);

	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_set_checksum(buffer, length);

	return length;
}
EXPORT_SYMBOL(hdmi_spd_infoframe_pack_only);

/**
 * hdmi_spd_infoframe_pack() - check a HDMI SPD infoframe,
 *                             and write it to binary buffer
 * @frame: HDMI SPD infoframe
 * @buffer: destination buffer
 * @size: size of buffer
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields, after which it packs the information
 * contained in the @frame structure into a binary representation that
 * can be written into the corresponding controller registers. This function
 * 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)
{
	int ret;

	ret = hdmi_spd_infoframe_check(frame);
	if (ret)
		return ret;

	return hdmi_spd_infoframe_pack_only(frame, buffer, size);
}
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 = HDMI_AUDIO_INFOFRAME_SIZE;

	return 0;
}
EXPORT_SYMBOL(hdmi_audio_infoframe_init);

static int hdmi_audio_infoframe_check_only(const struct hdmi_audio_infoframe *frame)
{
	if (frame->type != HDMI_INFOFRAME_TYPE_AUDIO ||
	    frame->version != 1 ||
	    frame->length != HDMI_AUDIO_INFOFRAME_SIZE)
		return -EINVAL;

	return 0;
}

/**
 * hdmi_audio_infoframe_check() - check a HDMI audio infoframe
 * @frame: HDMI audio infoframe
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields.
 *
 * Returns 0 on success or a negative error code on failure.
 */
int hdmi_audio_infoframe_check(struct hdmi_audio_infoframe *frame)
{
	return hdmi_audio_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_audio_infoframe_check);

/**
 * hdmi_audio_infoframe_pack_only() - 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_only(const struct hdmi_audio_infoframe *frame,
				       void *buffer, size_t size)
{
	unsigned char channels;
	u8 *ptr = buffer;
	size_t length;
	int ret;

	ret = hdmi_audio_infoframe_check_only(frame);
	if (ret)
		return ret;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)
		return -ENOSPC;

	memset(buffer, 0, size);

	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_set_checksum(buffer, length);

	return length;
}
EXPORT_SYMBOL(hdmi_audio_infoframe_pack_only);

/**
 * hdmi_audio_infoframe_pack() - check a HDMI Audio infoframe,
 *                               and write it to binary buffer
 * @frame: HDMI Audio infoframe
 * @buffer: destination buffer
 * @size: size of buffer
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields, after which it packs the information
 * contained in the @frame structure into a binary representation that
 * can be written into the corresponding controller registers. This function
 * 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)
{
	int ret;

	ret = hdmi_audio_infoframe_check(frame);
	if (ret)
		return ret;

	return hdmi_audio_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_audio_infoframe_pack);

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

	frame->type = HDMI_INFOFRAME_TYPE_VENDOR;
	frame->version = 1;

	frame->oui = HDMI_IEEE_OUI;

	/*
	 * 0 is a valid value for s3d_struct, so we use a special "not set"
	 * value
	 */
	frame->s3d_struct = HDMI_3D_STRUCTURE_INVALID;
	frame->length = 4;

	return 0;
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_init);

static int hdmi_vendor_infoframe_length(const struct hdmi_vendor_infoframe *frame)
{
	/* for side by side (half) we also need to provide 3D_Ext_Data */
	if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
		return 6;
	else if (frame->vic != 0 || frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
		return 5;
	else
		return 4;
}

static int hdmi_vendor_infoframe_check_only(const struct hdmi_vendor_infoframe *frame)
{
	if (frame->type != HDMI_INFOFRAME_TYPE_VENDOR ||
	    frame->version != 1 ||
	    frame->oui != HDMI_IEEE_OUI)
		return -EINVAL;

	/* only one of those can be supplied */
	if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)
		return -EINVAL;

	if (frame->length != hdmi_vendor_infoframe_length(frame))
		return -EINVAL;

	return 0;
}

/**
 * hdmi_vendor_infoframe_check() - check a HDMI vendor infoframe
 * @frame: HDMI infoframe
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields.
 *
 * Returns 0 on success or a negative error code on failure.
 */
int hdmi_vendor_infoframe_check(struct hdmi_vendor_infoframe *frame)
{
	frame->length = hdmi_vendor_infoframe_length(frame);

	return hdmi_vendor_infoframe_check_only(frame);
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_check);

/**
 * hdmi_vendor_infoframe_pack_only() - write a HDMI vendor infoframe to binary buffer
 * @frame: HDMI 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_only(const struct hdmi_vendor_infoframe *frame,
					void *buffer, size_t size)
{
	u8 *ptr = buffer;
	size_t length;
	int ret;

	ret = hdmi_vendor_infoframe_check_only(frame);
	if (ret)
		return ret;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)
		return -ENOSPC;

	memset(buffer, 0, size);

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

	/* HDMI OUI */
	ptr[4] = 0x03;
	ptr[5] = 0x0c;
	ptr[6] = 0x00;

	if (frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
		ptr[7] = 0x2 << 5;	/* video format */
		ptr[8] = (frame->s3d_struct & 0xf) << 4;
		if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
			ptr[9] = (frame->s3d_ext_data & 0xf) << 4;
	} else if (frame->vic) {
		ptr[7] = 0x1 << 5;	/* video format */
		ptr[8] = frame->vic;
	} else {
		ptr[7] = 0x0 << 5;	/* video format */
	}

	hdmi_infoframe_set_checksum(buffer, length);

	return length;
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_pack_only);

/**
 * hdmi_vendor_infoframe_pack() - check a HDMI Vendor infoframe,
 *                                and write it to binary buffer
 * @frame: HDMI Vendor infoframe
 * @buffer: destination buffer
 * @size: size of buffer
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields, after which it packs the information
 * contained in the @frame structure into a binary representation that
 * can be written into the corresponding controller registers. This function
 * 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)
{
	int ret;

	ret = hdmi_vendor_infoframe_check(frame);
	if (ret)
		return ret;

	return hdmi_vendor_infoframe_pack_only(frame, buffer, size);
}
EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);

static int
hdmi_vendor_any_infoframe_check_only(const union hdmi_vendor_any_infoframe *frame)
{
	if (frame->any.type != HDMI_INFOFRAME_TYPE_VENDOR ||
	    frame->any.version != 1)
		return -EINVAL;

	return 0;
}

/*
 * hdmi_vendor_any_infoframe_check() - check a vendor infoframe
 */
static int
hdmi_vendor_any_infoframe_check(union hdmi_vendor_any_infoframe *frame)
{
	int ret;

	ret = hdmi_vendor_any_infoframe_check_only(frame);
	if (ret)
		return ret;

	/* we only know about HDMI vendor infoframes */
	if (frame->any.oui != HDMI_IEEE_OUI)
		return -EINVAL;

	return hdmi_vendor_infoframe_check(&frame->hdmi);
}

/*
 * hdmi_vendor_any_infoframe_pack_only() - write a vendor infoframe to binary buffer
 */
static ssize_t
hdmi_vendor_any_infoframe_pack_only(const union hdmi_vendor_any_infoframe *frame,
				    void *buffer, size_t size)
{
	int ret;

	ret = hdmi_vendor_any_infoframe_check_only(frame);
	if (ret)
		return ret;

	/* we only know about HDMI vendor infoframes */
	if (frame->any.oui != HDMI_IEEE_OUI)
		return -EINVAL;

	return hdmi_vendor_infoframe_pack_only(&frame->hdmi, buffer, size);
}

/*
 * hdmi_vendor_any_infoframe_pack() - check a vendor infoframe,
 *                                    and write it to binary buffer
 */
static ssize_t
hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,
			       void *buffer, size_t size)
{
	int ret;

	ret = hdmi_vendor_any_infoframe_check(frame);
	if (ret)
		return ret;

	return hdmi_vendor_any_infoframe_pack_only(frame, buffer, size);
}

/**
 * hdmi_infoframe_check() - check a HDMI infoframe
 * @frame: HDMI infoframe
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields.
 *
 * Returns 0 on success or a negative error code on failure.
 */
int
hdmi_infoframe_check(union hdmi_infoframe *frame)
{
	switch (frame->any.type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		return hdmi_avi_infoframe_check(&frame->avi);
	case HDMI_INFOFRAME_TYPE_SPD:
		return hdmi_spd_infoframe_check(&frame->spd);
	case HDMI_INFOFRAME_TYPE_AUDIO:
		return hdmi_audio_infoframe_check(&frame->audio);
	case HDMI_INFOFRAME_TYPE_VENDOR:
		return hdmi_vendor_any_infoframe_check(&frame->vendor);
	default:
		WARN(1, "Bad infoframe type %d\n", frame->any.type);
		return -EINVAL;
	}
}
EXPORT_SYMBOL(hdmi_infoframe_check);

/**
 * hdmi_infoframe_pack_only() - write a HDMI infoframe to binary buffer
 * @frame: HDMI 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_infoframe_pack_only(const union hdmi_infoframe *frame, void *buffer, size_t size)
{
	ssize_t length;

	switch (frame->any.type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		length = hdmi_avi_infoframe_pack_only(&frame->avi,
						      buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_SPD:
		length = hdmi_spd_infoframe_pack_only(&frame->spd,
						      buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_AUDIO:
		length = hdmi_audio_infoframe_pack_only(&frame->audio,
							buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		length = hdmi_vendor_any_infoframe_pack_only(&frame->vendor,
							     buffer, size);
		break;
	default:
		WARN(1, "Bad infoframe type %d\n", frame->any.type);
		length = -EINVAL;
	}

	return length;
}
EXPORT_SYMBOL(hdmi_infoframe_pack_only);

/**
 * hdmi_infoframe_pack() - check a HDMI infoframe,
 *                         and write it to binary buffer
 * @frame: HDMI infoframe
 * @buffer: destination buffer
 * @size: size of buffer
 *
 * Validates that the infoframe is consistent and updates derived fields
 * (eg. length) based on other fields, after which it packs the information
 * contained in the @frame structure into a binary representation that
 * can be written into the corresponding controller registers. This function
 * 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_infoframe_pack(union hdmi_infoframe *frame,
		    void *buffer, size_t size)
{
	ssize_t length;

	switch (frame->any.type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		length = hdmi_avi_infoframe_pack(&frame->avi, buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_SPD:
		length = hdmi_spd_infoframe_pack(&frame->spd, buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_AUDIO:
		length = hdmi_audio_infoframe_pack(&frame->audio, buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		length = hdmi_vendor_any_infoframe_pack(&frame->vendor,
							buffer, size);
		break;
	default:
		WARN(1, "Bad infoframe type %d\n", frame->any.type);
		length = -EINVAL;
	}

	return length;
}
EXPORT_SYMBOL(hdmi_infoframe_pack);

static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type)
{
	if (type < 0x80 || type > 0x9f)
		return "Invalid";
	switch (type) {
	case HDMI_INFOFRAME_TYPE_VENDOR:
		return "Vendor";
	case HDMI_INFOFRAME_TYPE_AVI:
		return "Auxiliary Video Information (AVI)";
	case HDMI_INFOFRAME_TYPE_SPD:
		return "Source Product Description (SPD)";
	case HDMI_INFOFRAME_TYPE_AUDIO:
		return "Audio";
	}
	return "Reserved";
}

static void hdmi_infoframe_log_header(const char *level,
				      struct device *dev,
				      const struct hdmi_any_infoframe *frame)
{
	hdmi_log("HDMI infoframe: %s, version %u, length %u\n",
		hdmi_infoframe_type_get_name(frame->type),
		frame->version, frame->length);
}

static const char *hdmi_colorspace_get_name(enum hdmi_colorspace colorspace)
{
	switch (colorspace) {
	case HDMI_COLORSPACE_RGB:
		return "RGB";
	case HDMI_COLORSPACE_YUV422:
		return "YCbCr 4:2:2";
	case HDMI_COLORSPACE_YUV444:
		return "YCbCr 4:4:4";
	case HDMI_COLORSPACE_YUV420:
		return "YCbCr 4:2:0";
	case HDMI_COLORSPACE_RESERVED4:
		return "Reserved (4)";
	case HDMI_COLORSPACE_RESERVED5:
		return "Reserved (5)";
	case HDMI_COLORSPACE_RESERVED6:
		return "Reserved (6)";
	case HDMI_COLORSPACE_IDO_DEFINED:
		return "IDO Defined";
	}
	return "Invalid";
}

static const char *hdmi_scan_mode_get_name(enum hdmi_scan_mode scan_mode)
{
	switch (scan_mode) {
	case HDMI_SCAN_MODE_NONE:
		return "No Data";
	case HDMI_SCAN_MODE_OVERSCAN:
		return "Overscan";
	case HDMI_SCAN_MODE_UNDERSCAN:
		return "Underscan";
	case HDMI_SCAN_MODE_RESERVED:
		return "Reserved";
	}
	return "Invalid";
}

static const char *hdmi_colorimetry_get_name(enum hdmi_colorimetry colorimetry)
{
	switch (colorimetry) {
	case HDMI_COLORIMETRY_NONE:
		return "No Data";
	case HDMI_COLORIMETRY_ITU_601:
		return "ITU601";
	case HDMI_COLORIMETRY_ITU_709:
		return "ITU709";
	case HDMI_COLORIMETRY_EXTENDED:
		return "Extended";
	}
	return "Invalid";
}

static const char *
hdmi_picture_aspect_get_name(enum hdmi_picture_aspect picture_aspect)
{
	switch (picture_aspect) {
	case HDMI_PICTURE_ASPECT_NONE:
		return "No Data";
	case HDMI_PICTURE_ASPECT_4_3:
		return "4:3";
	case HDMI_PICTURE_ASPECT_16_9:
		return "16:9";
	case HDMI_PICTURE_ASPECT_64_27:
		return "64:27";
	case HDMI_PICTURE_ASPECT_256_135:
		return "256:135";
	case HDMI_PICTURE_ASPECT_RESERVED:
		return "Reserved";
	}
	return "Invalid";
}

static const char *
hdmi_active_aspect_get_name(enum hdmi_active_aspect active_aspect)
{
	if (active_aspect < 0 || active_aspect > 0xf)
		return "Invalid";

	switch (active_aspect) {
	case HDMI_ACTIVE_ASPECT_16_9_TOP:
		return "16:9 Top";
	case HDMI_ACTIVE_ASPECT_14_9_TOP:
		return "14:9 Top";
	case HDMI_ACTIVE_ASPECT_16_9_CENTER:
		return "16:9 Center";
	case HDMI_ACTIVE_ASPECT_PICTURE:
		return "Same as Picture";
	case HDMI_ACTIVE_ASPECT_4_3:
		return "4:3";
	case HDMI_ACTIVE_ASPECT_16_9:
		return "16:9";
	case HDMI_ACTIVE_ASPECT_14_9:
		return "14:9";
	case HDMI_ACTIVE_ASPECT_4_3_SP_14_9:
		return "4:3 SP 14:9";
	case HDMI_ACTIVE_ASPECT_16_9_SP_14_9:
		return "16:9 SP 14:9";
	case HDMI_ACTIVE_ASPECT_16_9_SP_4_3:
		return "16:9 SP 4:3";
	}
	return "Reserved";
}

static const char *
hdmi_extended_colorimetry_get_name(enum hdmi_extended_colorimetry ext_col)
{
	switch (ext_col) {
	case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
		return "xvYCC 601";
	case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
		return "xvYCC 709";
	case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
		return "sYCC 601";
	case HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601:
		return "Adobe YCC 601";
	case HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB:
		return "Adobe RGB";
	case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
		return "BT.2020 Constant Luminance";
	case HDMI_EXTENDED_COLORIMETRY_BT2020:
		return "BT.2020";
	case HDMI_EXTENDED_COLORIMETRY_RESERVED:
		return "Reserved";
	}
	return "Invalid";
}

static const char *
hdmi_quantization_range_get_name(enum hdmi_quantization_range qrange)
{
	switch (qrange) {
	case HDMI_QUANTIZATION_RANGE_DEFAULT:
		return "Default";
	case HDMI_QUANTIZATION_RANGE_LIMITED:
		return "Limited";
	case HDMI_QUANTIZATION_RANGE_FULL:
		return "Full";
	case HDMI_QUANTIZATION_RANGE_RESERVED:
		return "Reserved";
	}
	return "Invalid";
}

static const char *hdmi_nups_get_name(enum hdmi_nups nups)
{
	switch (nups) {
	case HDMI_NUPS_UNKNOWN:
		return "Unknown Non-uniform Scaling";
	case HDMI_NUPS_HORIZONTAL:
		return "Horizontally Scaled";
	case HDMI_NUPS_VERTICAL:
		return "Vertically Scaled";
	case HDMI_NUPS_BOTH:
		return "Horizontally and Vertically Scaled";
	}
	return "Invalid";
}

static const char *
hdmi_ycc_quantization_range_get_name(enum hdmi_ycc_quantization_range qrange)
{
	switch (qrange) {
	case HDMI_YCC_QUANTIZATION_RANGE_LIMITED:
		return "Limited";
	case HDMI_YCC_QUANTIZATION_RANGE_FULL:
		return "Full";
	}
	return "Invalid";
}

static const char *
hdmi_content_type_get_name(enum hdmi_content_type content_type)
{
	switch (content_type) {
	case HDMI_CONTENT_TYPE_GRAPHICS:
		return "Graphics";
	case HDMI_CONTENT_TYPE_PHOTO:
		return "Photo";
	case HDMI_CONTENT_TYPE_CINEMA:
		return "Cinema";
	case HDMI_CONTENT_TYPE_GAME:
		return "Game";
	}
	return "Invalid";
}

/**
 * hdmi_avi_infoframe_log() - log info of HDMI AVI infoframe
 * @level: logging level
 * @dev: device
 * @frame: HDMI AVI infoframe
 */
static void hdmi_avi_infoframe_log(const char *level,
				   struct device *dev,
				   const struct hdmi_avi_infoframe *frame)
{
	hdmi_infoframe_log_header(level, dev,
				  (const struct hdmi_any_infoframe *)frame);

	hdmi_log("    colorspace: %s\n",
			hdmi_colorspace_get_name(frame->colorspace));
	hdmi_log("    scan mode: %s\n",
			hdmi_scan_mode_get_name(frame->scan_mode));
	hdmi_log("    colorimetry: %s\n",
			hdmi_colorimetry_get_name(frame->colorimetry));
	hdmi_log("    picture aspect: %s\n",
			hdmi_picture_aspect_get_name(frame->picture_aspect));
	hdmi_log("    active aspect: %s\n",
			hdmi_active_aspect_get_name(frame->active_aspect));
	hdmi_log("    itc: %s\n", frame->itc ? "IT Content" : "No Data");
	hdmi_log("    extended colorimetry: %s\n",
			hdmi_extended_colorimetry_get_name(frame->extended_colorimetry));
	hdmi_log("    quantization range: %s\n",
			hdmi_quantization_range_get_name(frame->quantization_range));
	hdmi_log("    nups: %s\n", hdmi_nups_get_name(frame->nups));
	hdmi_log("    video code: %u\n", frame->video_code);
	hdmi_log("    ycc quantization range: %s\n",
			hdmi_ycc_quantization_range_get_name(frame->ycc_quantization_range));
	hdmi_log("    hdmi content type: %s\n",
			hdmi_content_type_get_name(frame->content_type));
	hdmi_log("    pixel repeat: %u\n", frame->pixel_repeat);
	hdmi_log("    bar top %u, bottom %u, left %u, right %u\n",
			frame->top_bar, frame->bottom_bar,
			frame->left_bar, frame->right_bar);
}

static const char *hdmi_spd_sdi_get_name(enum hdmi_spd_sdi sdi)
{
	if (sdi < 0 || sdi > 0xff)
		return "Invalid";
	switch (sdi) {
	case HDMI_SPD_SDI_UNKNOWN:
		return "Unknown";
	case HDMI_SPD_SDI_DSTB:
		return "Digital STB";
	case HDMI_SPD_SDI_DVDP:
		return "DVD Player";
	case HDMI_SPD_SDI_DVHS:
		return "D-VHS";
	case HDMI_SPD_SDI_HDDVR:
		return "HDD Videorecorder";
	case HDMI_SPD_SDI_DVC:
		return "DVC";
	case HDMI_SPD_SDI_DSC:
		return "DSC";
	case HDMI_SPD_SDI_VCD:
		return "Video CD";
	case HDMI_SPD_SDI_GAME:
		return "Game";
	case HDMI_SPD_SDI_PC:
		return "PC General";
	case HDMI_SPD_SDI_BD:
		return "Blu-Ray Disc (BD)";
	case HDMI_SPD_SDI_SACD:
		return "Super Audio CD";
	case HDMI_SPD_SDI_HDDVD:
		return "HD DVD";
	case HDMI_SPD_SDI_PMP:
		return "PMP";
	}
	return "Reserved";
}

/**
 * hdmi_spd_infoframe_log() - log info of HDMI SPD infoframe
 * @level: logging level
 * @dev: device
 * @frame: HDMI SPD infoframe
 */
static void hdmi_spd_infoframe_log(const char *level,
				   struct device *dev,
				   const struct hdmi_spd_infoframe *frame)
{
	u8 buf[17];

	hdmi_infoframe_log_header(level, dev,
				  (const struct hdmi_any_infoframe *)frame);

	memset(buf, 0, sizeof(buf));

	strncpy(buf, frame->vendor, 8);
	hdmi_log("    vendor: %s\n", buf);
	strncpy(buf, frame->product, 16);
	hdmi_log("    product: %s\n", buf);
	hdmi_log("    source device information: %s (0x%x)\n",
		hdmi_spd_sdi_get_name(frame->sdi), frame->sdi);
}

static const char *
hdmi_audio_coding_type_get_name(enum hdmi_audio_coding_type coding_type)
{
	switch (coding_type) {
	case HDMI_AUDIO_CODING_TYPE_STREAM:
		return "Refer to Stream Header";
	case HDMI_AUDIO_CODING_TYPE_PCM:
		return "PCM";
	case HDMI_AUDIO_CODING_TYPE_AC3:
		return "AC-3";
	case HDMI_AUDIO_CODING_TYPE_MPEG1:
		return "MPEG1";
	case HDMI_AUDIO_CODING_TYPE_MP3:
		return "MP3";
	case HDMI_AUDIO_CODING_TYPE_MPEG2:
		return "MPEG2";
	case HDMI_AUDIO_CODING_TYPE_AAC_LC:
		return "AAC";
	case HDMI_AUDIO_CODING_TYPE_DTS:
		return "DTS";
	case HDMI_AUDIO_CODING_TYPE_ATRAC:
		return "ATRAC";
	case HDMI_AUDIO_CODING_TYPE_DSD:
		return "One Bit Audio";
	case HDMI_AUDIO_CODING_TYPE_EAC3:
		return "Dolby Digital +";
	case HDMI_AUDIO_CODING_TYPE_DTS_HD:
		return "DTS-HD";
	case HDMI_AUDIO_CODING_TYPE_MLP:
		return "MAT (MLP)";
	case HDMI_AUDIO_CODING_TYPE_DST:
		return "DST";
	case HDMI_AUDIO_CODING_TYPE_WMA_PRO:
		return "WMA PRO";
	case HDMI_AUDIO_CODING_TYPE_CXT:
		return "Refer to CXT";
	}
	return "Invalid";
}

static const char *
hdmi_audio_sample_size_get_name(enum hdmi_audio_sample_size sample_size)
{
	switch (sample_size) {
	case HDMI_AUDIO_SAMPLE_SIZE_STREAM:
		return "Refer to Stream Header";
	case HDMI_AUDIO_SAMPLE_SIZE_16:
		return "16 bit";
	case HDMI_AUDIO_SAMPLE_SIZE_20:
		return "20 bit";
	case HDMI_AUDIO_SAMPLE_SIZE_24:
		return "24 bit";
	}
	return "Invalid";
}

static const char *
hdmi_audio_sample_frequency_get_name(enum hdmi_audio_sample_frequency freq)
{
	switch (freq) {
	case HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM:
		return "Refer to Stream Header";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_32000:
		return "32 kHz";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_44100:
		return "44.1 kHz (CD)";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_48000:
		return "48 kHz";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_88200:
		return "88.2 kHz";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_96000:
		return "96 kHz";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_176400:
		return "176.4 kHz";
	case HDMI_AUDIO_SAMPLE_FREQUENCY_192000:
		return "192 kHz";
	}
	return "Invalid";
}

static const char *
hdmi_audio_coding_type_ext_get_name(enum hdmi_audio_coding_type_ext ctx)
{
	if (ctx < 0 || ctx > 0x1f)
		return "Invalid";

	switch (ctx) {
	case HDMI_AUDIO_CODING_TYPE_EXT_CT:
		return "Refer to CT";
	case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC:
		return "HE AAC";
	case HDMI_AUDIO_CODING_TYPE_EXT_HE_AAC_V2:
		return "HE AAC v2";
	case HDMI_AUDIO_CODING_TYPE_EXT_MPEG_SURROUND:
		return "MPEG SURROUND";
	case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC:
		return "MPEG-4 HE AAC";
	case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_V2:
		return "MPEG-4 HE AAC v2";
	case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC:
		return "MPEG-4 AAC LC";
	case HDMI_AUDIO_CODING_TYPE_EXT_DRA:
		return "DRA";
	case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_HE_AAC_SURROUND:
		return "MPEG-4 HE AAC + MPEG Surround";
	case HDMI_AUDIO_CODING_TYPE_EXT_MPEG4_AAC_LC_SURROUND:
		return "MPEG-4 AAC LC + MPEG Surround";
	}
	return "Reserved";
}

/**
 * hdmi_audio_infoframe_log() - log info of HDMI AUDIO infoframe
 * @level: logging level
 * @dev: device
 * @frame: HDMI AUDIO infoframe
 */
static void hdmi_audio_infoframe_log(const char *level,
				     struct device *dev,
				     const struct hdmi_audio_infoframe *frame)
{
	hdmi_infoframe_log_header(level, dev,
				  (const struct hdmi_any_infoframe *)frame);

	if (frame->channels)
		hdmi_log("    channels: %u\n", frame->channels - 1);
	else
		hdmi_log("    channels: Refer to stream header\n");
	hdmi_log("    coding type: %s\n",
			hdmi_audio_coding_type_get_name(frame->coding_type));
	hdmi_log("    sample size: %s\n",
			hdmi_audio_sample_size_get_name(frame->sample_size));
	hdmi_log("    sample frequency: %s\n",
			hdmi_audio_sample_frequency_get_name(frame->sample_frequency));
	hdmi_log("    coding type ext: %s\n",
			hdmi_audio_coding_type_ext_get_name(frame->coding_type_ext));
	hdmi_log("    channel allocation: 0x%x\n",
			frame->channel_allocation);
	hdmi_log("    level shift value: %u dB\n",
			frame->level_shift_value);
	hdmi_log("    downmix inhibit: %s\n",
			frame->downmix_inhibit ? "Yes" : "No");
}

static const char *
hdmi_3d_structure_get_name(enum hdmi_3d_structure s3d_struct)
{
	if (s3d_struct < 0 || s3d_struct > 0xf)
		return "Invalid";

	switch (s3d_struct) {
	case HDMI_3D_STRUCTURE_FRAME_PACKING:
		return "Frame Packing";
	case HDMI_3D_STRUCTURE_FIELD_ALTERNATIVE:
		return "Field Alternative";
	case HDMI_3D_STRUCTURE_LINE_ALTERNATIVE:
		return "Line Alternative";
	case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_FULL:
		return "Side-by-side (Full)";
	case HDMI_3D_STRUCTURE_L_DEPTH:
		return "L + Depth";
	case HDMI_3D_STRUCTURE_L_DEPTH_GFX_GFX_DEPTH:
		return "L + Depth + Graphics + Graphics-depth";
	case HDMI_3D_STRUCTURE_TOP_AND_BOTTOM:
		return "Top-and-Bottom";
	case HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF:
		return "Side-by-side (Half)";
	default:
		break;
	}
	return "Reserved";
}

/**
 * hdmi_vendor_infoframe_log() - log info of HDMI VENDOR infoframe
 * @level: logging level
 * @dev: device
 * @frame: HDMI VENDOR infoframe
 */
static void
hdmi_vendor_any_infoframe_log(const char *level,
			      struct device *dev,
			      const union hdmi_vendor_any_infoframe *frame)
{
	const struct hdmi_vendor_infoframe *hvf = &frame->hdmi;

	hdmi_infoframe_log_header(level, dev,
				  (const struct hdmi_any_infoframe *)frame);

	if (frame->any.oui != HDMI_IEEE_OUI) {
		hdmi_log("    not a HDMI vendor infoframe\n");
		return;
	}
	if (hvf->vic == 0 && hvf->s3d_struct == HDMI_3D_STRUCTURE_INVALID) {
		hdmi_log("    empty frame\n");
		return;
	}

	if (hvf->vic)
		hdmi_log("    HDMI VIC: %u\n", hvf->vic);
	if (hvf->s3d_struct != HDMI_3D_STRUCTURE_INVALID) {
		hdmi_log("    3D structure: %s\n",
				hdmi_3d_structure_get_name(hvf->s3d_struct));
		if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)
			hdmi_log("    3D extension data: %d\n",
					hvf->s3d_ext_data);
	}
}

/**
 * hdmi_infoframe_log() - log info of HDMI infoframe
 * @level: logging level
 * @dev: device
 * @frame: HDMI infoframe
 */
void hdmi_infoframe_log(const char *level,
			struct device *dev,
			const union hdmi_infoframe *frame)
{
	switch (frame->any.type) {
	case HDMI_INFOFRAME_TYPE_AVI:
		hdmi_avi_infoframe_log(level, dev, &frame->avi);
		break;
	case HDMI_INFOFRAME_TYPE_SPD:
		hdmi_spd_infoframe_log(level, dev, &frame->spd);
		break;
	case HDMI_INFOFRAME_TYPE_AUDIO:
		hdmi_audio_infoframe_log(level, dev, &frame->audio);
		break;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		hdmi_vendor_any_infoframe_log(level, dev, &frame->vendor);
		break;
	}
}
EXPORT_SYMBOL(hdmi_infoframe_log);

/**
 * hdmi_avi_infoframe_unpack() - unpack binary buffer to a HDMI AVI infoframe
 * @frame: HDMI AVI infoframe
 * @buffer: source buffer
 * @size: size of buffer
 *
 * Unpacks the information contained in binary @buffer into a structured
 * @frame of the HDMI Auxiliary Video (AVI) information frame.
 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
 * specification.
 *
 * Returns 0 on success or a negative error code on failure.
 */
static int hdmi_avi_infoframe_unpack(struct hdmi_avi_infoframe *frame,
				     const void *buffer, size_t size)
{
	const u8 *ptr = buffer;
	int ret;

	if (size < HDMI_INFOFRAME_SIZE(AVI))
		return -EINVAL;

	if (ptr[0] != HDMI_INFOFRAME_TYPE_AVI ||
	    ptr[1] != 2 ||
	    ptr[2] != HDMI_AVI_INFOFRAME_SIZE)
		return -EINVAL;

	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AVI)) != 0)
		return -EINVAL;

	ret = hdmi_avi_infoframe_init(frame);
	if (ret)
		return ret;

	ptr += HDMI_INFOFRAME_HEADER_SIZE;

	frame->colorspace = (ptr[0] >> 5) & 0x3;
	if (ptr[0] & 0x10)
		frame->active_aspect = ptr[1] & 0xf;
	if (ptr[0] & 0x8) {
		frame->top_bar = (ptr[5] << 8) + ptr[6];
		frame->bottom_bar = (ptr[7] << 8) + ptr[8];
	}
	if (ptr[0] & 0x4) {
		frame->left_bar = (ptr[9] << 8) + ptr[10];
		frame->right_bar = (ptr[11] << 8) + ptr[12];
	}
	frame->scan_mode = ptr[0] & 0x3;

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

	frame->itc = ptr[2] & 0x80 ? true : false;
	frame->extended_colorimetry = (ptr[2] >> 4) & 0x7;
	frame->quantization_range = (ptr[2] >> 2) & 0x3;
	frame->nups = ptr[2] & 0x3;

	frame->video_code = ptr[3] & 0x7f;
	frame->ycc_quantization_range = (ptr[4] >> 6) & 0x3;
	frame->content_type = (ptr[4] >> 4) & 0x3;

	frame->pixel_repeat = ptr[4] & 0xf;

	return 0;
}

/**
 * hdmi_spd_infoframe_unpack() - unpack binary buffer to a HDMI SPD infoframe
 * @frame: HDMI SPD infoframe
 * @buffer: source buffer
 * @size: size of buffer
 *
 * Unpacks the information contained in binary @buffer into a structured
 * @frame of the HDMI Source Product Description (SPD) information frame.
 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
 * specification.
 *
 * Returns 0 on success or a negative error code on failure.
 */
static int hdmi_spd_infoframe_unpack(struct hdmi_spd_infoframe *frame,
				     const void *buffer, size_t size)
{
	const u8 *ptr = buffer;
	int ret;

	if (size < HDMI_INFOFRAME_SIZE(SPD))
		return -EINVAL;

	if (ptr[0] != HDMI_INFOFRAME_TYPE_SPD ||
	    ptr[1] != 1 ||
	    ptr[2] != HDMI_SPD_INFOFRAME_SIZE) {
		return -EINVAL;
	}

	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(SPD)) != 0)
		return -EINVAL;

	ptr += HDMI_INFOFRAME_HEADER_SIZE;

	ret = hdmi_spd_infoframe_init(frame, ptr, ptr + 8);
	if (ret)
		return ret;

	frame->sdi = ptr[24];

	return 0;
}

/**
 * hdmi_audio_infoframe_unpack() - unpack binary buffer to a HDMI AUDIO infoframe
 * @frame: HDMI Audio infoframe
 * @buffer: source buffer
 * @size: size of buffer
 *
 * Unpacks the information contained in binary @buffer into a structured
 * @frame of the HDMI Audio information frame.
 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
 * specification.
 *
 * Returns 0 on success or a negative error code on failure.
 */
static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame,
				       const void *buffer, size_t size)
{
	const u8 *ptr = buffer;
	int ret;

	if (size < HDMI_INFOFRAME_SIZE(AUDIO))
		return -EINVAL;

	if (ptr[0] != HDMI_INFOFRAME_TYPE_AUDIO ||
	    ptr[1] != 1 ||
	    ptr[2] != HDMI_AUDIO_INFOFRAME_SIZE) {
		return -EINVAL;
	}

	if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(AUDIO)) != 0)
		return -EINVAL;

	ret = hdmi_audio_infoframe_init(frame);
	if (ret)
		return ret;

	ptr += HDMI_INFOFRAME_HEADER_SIZE;

	frame->channels = ptr[0] & 0x7;
	frame->coding_type = (ptr[0] >> 4) & 0xf;
	frame->sample_size = ptr[1] & 0x3;
	frame->sample_frequency = (ptr[1] >> 2) & 0x7;
	frame->coding_type_ext = ptr[2] & 0x1f;
	frame->channel_allocation = ptr[3];
	frame->level_shift_value = (ptr[4] >> 3) & 0xf;
	frame->downmix_inhibit = ptr[4] & 0x80 ? true : false;

	return 0;
}

/**
 * hdmi_vendor_infoframe_unpack() - unpack binary buffer to a HDMI vendor infoframe
 * @frame: HDMI Vendor infoframe
 * @buffer: source buffer
 * @size: size of buffer
 *
 * Unpacks the information contained in binary @buffer into a structured
 * @frame of the HDMI Vendor information frame.
 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
 * specification.
 *
 * Returns 0 on success or a negative error code on failure.
 */
static int
hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame,
				 const void *buffer, size_t size)
{
	const u8 *ptr = buffer;
	size_t length;
	int ret;
	u8 hdmi_video_format;
	struct hdmi_vendor_infoframe *hvf = &frame->hdmi;

	if (size < HDMI_INFOFRAME_HEADER_SIZE)
		return -EINVAL;

	if (ptr[0] != HDMI_INFOFRAME_TYPE_VENDOR ||
	    ptr[1] != 1 ||
	    (ptr[2] != 4 && ptr[2] != 5 && ptr[2] != 6))
		return -EINVAL;

	length = ptr[2];

	if (size < HDMI_INFOFRAME_HEADER_SIZE + length)
		return -EINVAL;

	if (hdmi_infoframe_checksum(buffer,
				    HDMI_INFOFRAME_HEADER_SIZE + length) != 0)
		return -EINVAL;

	ptr += HDMI_INFOFRAME_HEADER_SIZE;

	/* HDMI OUI */
	if ((ptr[0] != 0x03) ||
	    (ptr[1] != 0x0c) ||
	    (ptr[2] != 0x00))
		return -EINVAL;

	hdmi_video_format = ptr[3] >> 5;

	if (hdmi_video_format > 0x2)
		return -EINVAL;

	ret = hdmi_vendor_infoframe_init(hvf);
	if (ret)
		return ret;

	hvf->length = length;

	if (hdmi_video_format == 0x2) {
		if (length != 5 && length != 6)
			return -EINVAL;
		hvf->s3d_struct = ptr[4] >> 4;
		if (hvf->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF) {
			if (length != 6)
				return -EINVAL;
			hvf->s3d_ext_data = ptr[5] >> 4;
		}
	} else if (hdmi_video_format == 0x1) {
		if (length != 5)
			return -EINVAL;
		hvf->vic = ptr[4];
	} else {
		if (length != 4)
			return -EINVAL;
	}

	return 0;
}

/**
 * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe
 * @frame: HDMI infoframe
 * @buffer: source buffer
 * @size: size of buffer
 *
 * Unpacks the information contained in binary buffer @buffer into a structured
 * @frame of a HDMI infoframe.
 * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4
 * specification.
 *
 * Returns 0 on success or a negative error code on failure.
 */
int hdmi_infoframe_unpack(union hdmi_infoframe *frame,
			  const void *buffer, size_t size)
{
	int ret;
	const u8 *ptr = buffer;

	if (size < HDMI_INFOFRAME_HEADER_SIZE)
		return -EINVAL;

	switch (ptr[0]) {
	case HDMI_INFOFRAME_TYPE_AVI:
		ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_SPD:
		ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_AUDIO:
		ret = hdmi_audio_infoframe_unpack(&frame->audio, buffer, size);
		break;
	case HDMI_INFOFRAME_TYPE_VENDOR:
		ret = hdmi_vendor_any_infoframe_unpack(&frame->vendor, buffer, size);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}
EXPORT_SYMBOL(hdmi_infoframe_unpack);