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/*
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******************************************************************************
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*
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* isp_v4l2_helper.h
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*
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* Hawkview ISP - isp_v4l2_helper.h module
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*
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* Copyright (c) 2016 by Allwinnertech Co., Ltd. http://www.allwinnertech.com
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*
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* Version Author Date Description
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*
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* 3.0 Yang Feng 2016/03/17 VIDEO INPUT
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*
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*****************************************************************************
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*/
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#ifndef _ISP_V4L2_HELPER_H_
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#define _ISP_V4L2_HELPER_H_
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#include <linux/v4l2-subdev.h>
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struct media_entity;
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/*
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* v4l2_subdev_open - Open a sub-device
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* @entity: Sub-device media entity
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*
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* Open the V4L2 subdev device node associated with @entity. The file descriptor
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* is stored in the media_entity structure.
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*
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* Return 0 on success, or a negative error code on failure.
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*/
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int v4l2_subdev_open(struct media_entity *entity);
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/*
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* v4l2_subdev_close - Close a sub-device
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* @entity: Sub-device media entity
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*
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* Close the V4L2 subdev device node associated with the @entity and opened by
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* a previous call to v4l2_subdev_open() (either explicit or implicit).
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*/
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void v4l2_subdev_close(struct media_entity *entity);
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/*
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* v4l2_get_control - Read the value of a control
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* @entity: device media entity
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* @id: Control ID
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* @value: Control value to be filled
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*
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* Retrieve the current value of control @id and store it in @value.
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*
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* Return 0 on success or a negative error code on failure.
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*/
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int v4l2_get_control(struct media_entity *entity, unsigned int id,
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int32_t *value);
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/*
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* v4l2_set_control - Write the value of a control
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* @entity: device media entity
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* @id: Control ID
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* @value: Control value
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*
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* Set control @id to @value. The device is allowed to modify the requested
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* value, in which case @value is updated to the modified value.
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*
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* Return 0 on success or a negative error code on failure.
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*/
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int v4l2_set_control(struct media_entity *entity, unsigned int id,
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int32_t *value);
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/*
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* v4l2_get_controls - Read the value of multiple controls
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* @entity: device media entity
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* @count: Number of controls
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* @ctrls: Controls to be read
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*
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* Retrieve the current value of controls identified by @ctrls.
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*
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* Return 0 on success or a negative error code on failure.
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*/
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int v4l2_get_controls(struct media_entity *entity, unsigned int count,
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struct v4l2_ext_control *ctrls);
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/*
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* v4l2_set_controls - Write the value of multiple controls
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* @entity: device media entity
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* @count: Number of controls
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* @ctrls: Controls to be written
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*
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* Set controls identified by @ctrls. The device is allowed to modify the
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* requested values, in which case @ctrls is updated to the modified value.
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*
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* Return 0 on success or a negative error code on failure.
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*/
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int v4l2_set_controls(struct media_entity *entity, unsigned int count,
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struct v4l2_ext_control *ctrls);
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#endif /*_ISP_V4L2_HELPER_H_*/
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