/*
 * 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_OPYCC_601:
                return "opYCC 601";
        case HDMI_EXTENDED_COLORIMETRY_OPRGB:
                return "opRGB";
        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);