linux-imx

/*

 * 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;