213 lines
7.3 KiB
C
213 lines
7.3 KiB
C
/*
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* V4L2 subdev interface library
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*
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* Copyright (C) 2010-2011 Ideas on board SPRL
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __SUBDEV_H__
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#define __SUBDEV_H__
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#include <linux/v4l2-subdev.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct media_entity;
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/**
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* @brief Open a sub-device.
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* @param entity - sub-device media entity.
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*
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* Open the V4L2 subdev device node associated with @a entity. The file
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* descriptor 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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* @brief Close a sub-device.
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* @param entity - sub-device media entity.
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*
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* Close the V4L2 subdev device node associated with the @a 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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* @brief Retrieve the format on a pad.
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* @param entity - subdev-device media entity.
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* @param format - format to be filled.
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* @param pad - pad number.
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* @param which - identifier of the format to get.
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*
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* Retrieve the current format on the @a entity @a pad and store it in the
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* @a format structure.
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*
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* @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try format stored
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* in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current
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* active format.
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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_get_format(struct media_entity *entity,
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struct v4l2_mbus_framefmt *format, unsigned int pad,
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enum v4l2_subdev_format_whence which);
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/**
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* @brief Set the format on a pad.
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* @param entity - subdev-device media entity.
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* @param format - format.
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* @param pad - pad number.
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* @param which - identifier of the format to set.
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*
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* Set the format on the @a entity @a pad to @a format. The driver is allowed to
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* modify the requested format, in which case @a format is updated with the
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* modifications.
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*
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* @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try format stored in the
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* file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the device with an
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* active format.
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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_set_format(struct media_entity *entity,
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struct v4l2_mbus_framefmt *format, unsigned int pad,
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enum v4l2_subdev_format_whence which);
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/**
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* @brief Retrieve a selection rectangle on a pad.
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* @param entity - subdev-device media entity.
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* @param r - rectangle to be filled.
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* @param pad - pad number.
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* @param target - selection target
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* @param which - identifier of the format to get.
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*
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* Retrieve the @a target selection rectangle on the @a entity @a pad
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* and store it in the @a rect structure.
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*
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* @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try
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* selection rectangle stored in the file handle, or
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* V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current active selection
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* rectangle.
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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_get_selection(struct media_entity *entity,
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struct v4l2_rect *rect, unsigned int pad, unsigned int target,
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enum v4l2_subdev_format_whence which);
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/**
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* @brief Set a selection rectangle on a pad.
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* @param entity - subdev-device media entity.
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* @param rect - crop rectangle.
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* @param pad - pad number.
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* @param target - selection target
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* @param which - identifier of the format to set.
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*
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* Set the @a target selection rectangle on the @a entity @a pad to @a
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* rect. The driver is allowed to modify the requested rectangle, in
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* which case @a rect is updated with the modifications.
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*
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* @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try crop rectangle
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* stored in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the
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* device with an active crop rectangle.
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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_set_selection(struct media_entity *entity,
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struct v4l2_rect *rect, unsigned int pad, unsigned int target,
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enum v4l2_subdev_format_whence which);
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/**
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* @brief Retrieve the frame interval on a sub-device.
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* @param entity - subdev-device media entity.
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* @param interval - frame interval to be filled.
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*
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* Retrieve the current frame interval on subdev @a entity and store it in the
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* @a interval structure.
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*
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* Frame interval retrieving is usually supported only on devices at the
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* beginning of video pipelines, such as sensors.
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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_get_frame_interval(struct media_entity *entity,
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struct v4l2_fract *interval);
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/**
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* @brief Set the frame interval on a sub-device.
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* @param entity - subdev-device media entity.
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* @param interval - frame interval.
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*
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* Set the frame interval on subdev @a entity to @a interval. The driver is
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* allowed to modify the requested frame interval, in which case @a interval is
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* updated with the modifications.
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*
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* Frame interval setting is usually supported only on devices at the beginning
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* of video pipelines, such as sensors.
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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_set_frame_interval(struct media_entity *entity,
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struct v4l2_fract *interval);
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/**
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* @brief Parse a string and apply format, crop and frame interval settings.
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* @param media - media device.
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* @param p - input string
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* @param endp - pointer to string p where parsing ended (return)
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*
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* Parse string @a p and apply format, crop and frame interval settings to a
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* subdev pad specified in @a p. @a endp will be written a pointer where
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* parsing of @a p ended.
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*
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* Format strings are separeted by commas (,).
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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_parse_setup_formats(struct media_device *media, const char *p);
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/**
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* @brief Convert media bus pixel code to string.
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* @param code - input string
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*
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* Convert media bus pixel code @a code to a human-readable string.
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*
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* @return A pointer to a string on success, NULL on failure.
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*/
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const char *v4l2_subdev_pixelcode_to_string(enum v4l2_mbus_pixelcode code);
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/**
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* @brief Parse string to media bus pixel code.
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* @param string - input string
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* @param lenght - length of the string
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*
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* Parse human readable string @a string to an media bus pixel code.
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*
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* @return media bus pixelcode on success, -1 on failure.
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*/
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enum v4l2_mbus_pixelcode v4l2_subdev_string_to_pixelcode(const char *string,
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unsigned int length);
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#ifdef __cplusplus
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}
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#endif
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#endif
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