324 lines
8.6 KiB
C
324 lines
8.6 KiB
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/errno.h>
|
|
#include <linux/export.h>
|
|
#include <linux/hdmi.h>
|
|
#include <linux/string.h>
|
|
|
|
static void hdmi_infoframe_checksum(void *buffer, size_t size)
|
|
{
|
|
u8 *ptr = buffer;
|
|
u8 csum = 0;
|
|
size_t i;
|
|
|
|
/* compute checksum */
|
|
for (i = 0; i < size; i++)
|
|
csum += ptr[i];
|
|
|
|
ptr[3] = 256 - csum;
|
|
}
|
|
|
|
/**
|
|
* hdmi_avi_infoframe_init() - initialize an HDMI AVI infoframe
|
|
* @frame: HDMI AVI infoframe
|
|
*
|
|
* Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
int hdmi_avi_infoframe_init(struct hdmi_avi_infoframe *frame)
|
|
{
|
|
memset(frame, 0, sizeof(*frame));
|
|
|
|
frame->type = HDMI_INFOFRAME_TYPE_AVI;
|
|
frame->version = 2;
|
|
frame->length = 13;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_avi_infoframe_init);
|
|
|
|
/**
|
|
* hdmi_avi_infoframe_pack() - write HDMI AVI infoframe to binary buffer
|
|
* @frame: HDMI AVI infoframe
|
|
* @buffer: destination buffer
|
|
* @size: size of buffer
|
|
*
|
|
* Packs the information contained in the @frame structure into a binary
|
|
* representation that can be written into the corresponding controller
|
|
* registers. Also computes the checksum as required by section 5.3.5 of
|
|
* the HDMI 1.4 specification.
|
|
*
|
|
* Returns the number of bytes packed into the binary buffer or a negative
|
|
* error code on failure.
|
|
*/
|
|
ssize_t hdmi_avi_infoframe_pack(struct hdmi_avi_infoframe *frame, void *buffer,
|
|
size_t size)
|
|
{
|
|
u8 *ptr = buffer;
|
|
size_t length;
|
|
|
|
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
|
|
|
|
if (size < length)
|
|
return -ENOSPC;
|
|
|
|
memset(buffer, 0, length);
|
|
|
|
ptr[0] = frame->type;
|
|
ptr[1] = frame->version;
|
|
ptr[2] = frame->length;
|
|
ptr[3] = 0; /* checksum */
|
|
|
|
/* start infoframe payload */
|
|
ptr += HDMI_INFOFRAME_HEADER_SIZE;
|
|
|
|
ptr[0] = ((frame->colorspace & 0x3) << 5) | (frame->scan_mode & 0x3);
|
|
|
|
if (frame->active_info_valid)
|
|
ptr[0] |= BIT(4);
|
|
|
|
if (frame->horizontal_bar_valid)
|
|
ptr[0] |= BIT(3);
|
|
|
|
if (frame->vertical_bar_valid)
|
|
ptr[0] |= BIT(2);
|
|
|
|
ptr[1] = ((frame->colorimetry & 0x3) << 6) |
|
|
((frame->picture_aspect & 0x3) << 4) |
|
|
(frame->active_aspect & 0xf);
|
|
|
|
ptr[2] = ((frame->extended_colorimetry & 0x7) << 4) |
|
|
((frame->quantization_range & 0x3) << 2) |
|
|
(frame->nups & 0x3);
|
|
|
|
if (frame->itc)
|
|
ptr[2] |= BIT(7);
|
|
|
|
ptr[3] = frame->video_code & 0x7f;
|
|
|
|
ptr[4] = ((frame->ycc_quantization_range & 0x3) << 6) |
|
|
((frame->content_type & 0x3) << 4) |
|
|
(frame->pixel_repeat & 0xf);
|
|
|
|
ptr[5] = frame->top_bar & 0xff;
|
|
ptr[6] = (frame->top_bar >> 8) & 0xff;
|
|
ptr[7] = frame->bottom_bar & 0xff;
|
|
ptr[8] = (frame->bottom_bar >> 8) & 0xff;
|
|
ptr[9] = frame->left_bar & 0xff;
|
|
ptr[10] = (frame->left_bar >> 8) & 0xff;
|
|
ptr[11] = frame->right_bar & 0xff;
|
|
ptr[12] = (frame->right_bar >> 8) & 0xff;
|
|
|
|
hdmi_infoframe_checksum(buffer, length);
|
|
|
|
return length;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_avi_infoframe_pack);
|
|
|
|
/**
|
|
* hdmi_spd_infoframe_init() - initialize an HDMI SPD infoframe
|
|
* @frame: HDMI SPD infoframe
|
|
* @vendor: vendor string
|
|
* @product: product string
|
|
*
|
|
* Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
int hdmi_spd_infoframe_init(struct hdmi_spd_infoframe *frame,
|
|
const char *vendor, const char *product)
|
|
{
|
|
memset(frame, 0, sizeof(*frame));
|
|
|
|
frame->type = HDMI_INFOFRAME_TYPE_SPD;
|
|
frame->version = 1;
|
|
frame->length = 25;
|
|
|
|
strncpy(frame->vendor, vendor, sizeof(frame->vendor));
|
|
strncpy(frame->product, product, sizeof(frame->product));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_spd_infoframe_init);
|
|
|
|
/**
|
|
* hdmi_spd_infoframe_pack() - write HDMI SPD infoframe to binary buffer
|
|
* @frame: HDMI SPD infoframe
|
|
* @buffer: destination buffer
|
|
* @size: size of buffer
|
|
*
|
|
* Packs the information contained in the @frame structure into a binary
|
|
* representation that can be written into the corresponding controller
|
|
* registers. Also computes the checksum as required by section 5.3.5 of
|
|
* the HDMI 1.4 specification.
|
|
*
|
|
* Returns the number of bytes packed into the binary buffer or a negative
|
|
* error code on failure.
|
|
*/
|
|
ssize_t hdmi_spd_infoframe_pack(struct hdmi_spd_infoframe *frame, void *buffer,
|
|
size_t size)
|
|
{
|
|
u8 *ptr = buffer;
|
|
size_t length;
|
|
|
|
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
|
|
|
|
if (size < length)
|
|
return -ENOSPC;
|
|
|
|
memset(buffer, 0, length);
|
|
|
|
ptr[0] = frame->type;
|
|
ptr[1] = frame->version;
|
|
ptr[2] = frame->length;
|
|
ptr[3] = 0; /* checksum */
|
|
|
|
/* start infoframe payload */
|
|
ptr += HDMI_INFOFRAME_HEADER_SIZE;
|
|
|
|
memcpy(ptr, frame->vendor, sizeof(frame->vendor));
|
|
memcpy(ptr + 8, frame->product, sizeof(frame->product));
|
|
|
|
ptr[24] = frame->sdi;
|
|
|
|
hdmi_infoframe_checksum(buffer, length);
|
|
|
|
return length;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_spd_infoframe_pack);
|
|
|
|
/**
|
|
* hdmi_audio_infoframe_init() - initialize an HDMI audio infoframe
|
|
* @frame: HDMI audio infoframe
|
|
*
|
|
* Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
int hdmi_audio_infoframe_init(struct hdmi_audio_infoframe *frame)
|
|
{
|
|
memset(frame, 0, sizeof(*frame));
|
|
|
|
frame->type = HDMI_INFOFRAME_TYPE_AUDIO;
|
|
frame->version = 1;
|
|
frame->length = 10;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_audio_infoframe_init);
|
|
|
|
/**
|
|
* hdmi_audio_infoframe_pack() - write HDMI audio infoframe to binary buffer
|
|
* @frame: HDMI audio infoframe
|
|
* @buffer: destination buffer
|
|
* @size: size of buffer
|
|
*
|
|
* Packs the information contained in the @frame structure into a binary
|
|
* representation that can be written into the corresponding controller
|
|
* registers. Also computes the checksum as required by section 5.3.5 of
|
|
* the HDMI 1.4 specification.
|
|
*
|
|
* Returns the number of bytes packed into the binary buffer or a negative
|
|
* error code on failure.
|
|
*/
|
|
ssize_t hdmi_audio_infoframe_pack(struct hdmi_audio_infoframe *frame,
|
|
void *buffer, size_t size)
|
|
{
|
|
unsigned char channels;
|
|
u8 *ptr = buffer;
|
|
size_t length;
|
|
|
|
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
|
|
|
|
if (size < length)
|
|
return -ENOSPC;
|
|
|
|
memset(buffer, 0, length);
|
|
|
|
if (frame->channels >= 2)
|
|
channels = frame->channels - 1;
|
|
else
|
|
channels = 0;
|
|
|
|
ptr[0] = frame->type;
|
|
ptr[1] = frame->version;
|
|
ptr[2] = frame->length;
|
|
ptr[3] = 0; /* checksum */
|
|
|
|
/* start infoframe payload */
|
|
ptr += HDMI_INFOFRAME_HEADER_SIZE;
|
|
|
|
ptr[0] = ((frame->coding_type & 0xf) << 4) | (channels & 0x7);
|
|
ptr[1] = ((frame->sample_frequency & 0x7) << 2) |
|
|
(frame->sample_size & 0x3);
|
|
ptr[2] = frame->coding_type_ext & 0x1f;
|
|
ptr[3] = frame->channel_allocation;
|
|
ptr[4] = (frame->level_shift_value & 0xf) << 3;
|
|
|
|
if (frame->downmix_inhibit)
|
|
ptr[4] |= BIT(7);
|
|
|
|
hdmi_infoframe_checksum(buffer, length);
|
|
|
|
return length;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_audio_infoframe_pack);
|
|
|
|
/**
|
|
* hdmi_vendor_infoframe_pack() - write a HDMI vendor infoframe to binary
|
|
* buffer
|
|
* @frame: HDMI vendor infoframe
|
|
* @buffer: destination buffer
|
|
* @size: size of buffer
|
|
*
|
|
* Packs the information contained in the @frame structure into a binary
|
|
* representation that can be written into the corresponding controller
|
|
* registers. Also computes the checksum as required by section 5.3.5 of
|
|
* the HDMI 1.4 specification.
|
|
*
|
|
* Returns the number of bytes packed into the binary buffer or a negative
|
|
* error code on failure.
|
|
*/
|
|
ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame,
|
|
void *buffer, size_t size)
|
|
{
|
|
u8 *ptr = buffer;
|
|
size_t length;
|
|
|
|
length = HDMI_INFOFRAME_HEADER_SIZE + frame->length;
|
|
|
|
if (size < length)
|
|
return -ENOSPC;
|
|
|
|
memset(buffer, 0, length);
|
|
|
|
ptr[0] = frame->type;
|
|
ptr[1] = frame->version;
|
|
ptr[2] = frame->length;
|
|
ptr[3] = 0; /* checksum */
|
|
|
|
memcpy(&ptr[HDMI_INFOFRAME_HEADER_SIZE], frame->data, frame->length);
|
|
|
|
hdmi_infoframe_checksum(buffer, length);
|
|
|
|
return length;
|
|
}
|
|
EXPORT_SYMBOL(hdmi_vendor_infoframe_pack);
|