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/*

 * 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 

#include 

#include 

#include 

#include 

#include 

#include 

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

static u8 hdmi_infoframe_checksum(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);

/**

 * hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer

 * @frame: HDMI AVI infoframe

 * @buffer: destination buffer

 * @size: size of buffer

 *

 * Packs the information contained in the @frame structure into a binary

 * representation that can be written into the corresponding controller

 * registers. Also computes the checksum as required by section 5.3.5 of

 * the HDMI 1.4 specification.

 *

 * Returns the number of bytes packed into the binary buffer or a negative

 * error code on failure.

 */

ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,

				size_t size)

{

	u8 *ptr = buffer;

	size_t length;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)

		return -ENOSPC;

	memset(buffer, 0, 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);

/**

 * 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);

/**

 * hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer

 * @frame: HDMI SPD infoframe

 * @buffer: destination buffer

 * @size: size of buffer

 *

 * Packs the information contained in the @frame structure into a binary

 * representation that can be written into the corresponding controller

 * registers. Also computes the checksum as required by section 5.3.5 of

 * the HDMI 1.4 specification.

 *

 * Returns the number of bytes packed into the binary buffer or a negative

 * error code on failure.

 */

ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,

				size_t size)

{

	u8 *ptr = buffer;

	size_t length;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)

		return -ENOSPC;

	memset(buffer, 0, 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);

/**

 * 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);

/**

 * hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer

 * @frame: HDMI audio infoframe

 * @buffer: destination buffer

 * @size: size of buffer

 *

 * Packs the information contained in the @frame structure into a binary

 * representation that can be written into the corresponding controller

 * registers. Also computes the checksum as required by section 5.3.5 of

 * the HDMI 1.4 specification.

 *

 * Returns the number of bytes packed into the binary buffer or a negative

 * error code on failure.

 */

ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,

				  void *buffer, size_t size)

{

	unsigned char channels;

	u8 *ptr = buffer;

	size_t length;

	length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;

	if (size < length)

		return -ENOSPC;

	memset(buffer, 0, 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);

/**

 * 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;

	return 0;

}

EXPORT_SYMBOL(hdmi_vendor_infoframe_init);

/**

 * hdmi_vendor_infoframe_pack() - 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(struct hdmi_vendor_infoframe *frame,

				 void *buffer, size_t size)

{

	u8 *ptr = buffer;

	size_t length;

	/* empty info frame */

	if (frame->vic == 0 && frame->s3d_struct == HDMI_3D_STRUCTURE_INVALID)

		return -EINVAL;

	/* only one of those can be supplied */

	if (frame->vic != 0 && frame->s3d_struct != HDMI_3D_STRUCTURE_INVALID)

		return -EINVAL;

	/* for side by side (half) we also need to provide 3D_Ext_Data */

	if (frame->s3d_struct >= HDMI_3D_STRUCTURE_SIDE_BY_SIDE_HALF)

		frame->length = 6;

	else

		frame->length = 5;

	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->vic) {

		ptr[7] = 0x1 << 5;	/* video format */

		ptr[8] = frame->vic;

	} else {

		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;

	}

	hdmi_infoframe_set_checksum(buffer, length);

	return length;

}

EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);

/*

 * hdmi_vendor_any_infoframe_pack() - write a vendor infoframe to binary buffer

 */

static ssize_t

hdmi_vendor_any_infoframe_pack(union hdmi_vendor_any_infoframe *frame,

			   void *buffer, size_t size)

{

	/* we only know about HDMI vendor infoframes */

	if (frame->any.oui != HDMI_IEEE_OUI)

		return -EINVAL;

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

}

/**

 * hdmi_infoframe_pack() - 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(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);