/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2019, Raspberry Pi (Trading) Limited * * cam_helper.hpp - helper class providing camera information */ #pragma once #include #include "camera_mode.h" #include "md_parser.hpp" #include "libcamera/internal/v4l2_videodevice.h" namespace RPi { // The CamHelper class provides a number of facilities that anyone trying // trying to drive a camera will need to know, but which are not provided by // by the standard driver framework. Specifically, it provides: // // A "CameraMode" structure to describe extra information about the chosen // mode of the driver. For example, how it is cropped from the full sensor // area, how it is scaled, whether pixels are averaged compared to the full // resolution. // // The ability to convert between number of lines of exposure and actual // exposure time, and to convert between the sensor's gain codes and actual // gains. // // A method to return the number of frames of delay between updating exposure // and analogue gain and the changes taking effect. For many sensors these // take the values 2 and 1 respectively, but sensors that are different will // need to over-ride the default method provided. // // A method to query if the sensor outputs embedded data that can be parsed. // // A parser to parse the metadata buffers provided by some sensors (for // example, the imx219 does; the ov5647 doesn't). This allows us to know for // sure the exposure and gain of the frame we're looking at. CamHelper // provides methods for converting analogue gains to and from the sensor's // native gain codes. // // Finally, a set of methods that determine how to handle the vagaries of // different camera modules on start-up or when switching modes. Some // modules may produce one or more frames that are not yet correctly exposed, // or where the metadata may be suspect. We have the following methods: // HideFramesStartup(): Tell the pipeline handler not to return this many // frames at start-up. This can also be used to hide initial frames // while the AGC and other algorithms are sorting themselves out. // HideFramesModeSwitch(): Tell the pipeline handler not to return this // many frames after a mode switch (other than start-up). Some sensors // may produce innvalid frames after a mode switch; others may not. // MistrustFramesStartup(): At start-up a sensor may return frames for // which we should not run any control algorithms (for example, metadata // may be invalid). // MistrustFramesModeSwitch(): The number of frames, after a mode switch // (other than start-up), for which control algorithms should not run // (for example, metadata may be unreliable). // Bitfield to represent the default orientation of the camera. typedef int CamTransform; static constexpr CamTransform CamTransform_IDENTITY = 0; static constexpr CamTransform CamTransform_HFLIP = 1; static constexpr CamTransform CamTransform_VFLIP = 2; class CamHelper { public: static CamHelper *Create(std::string const &cam_name); CamHelper(MdParser *parser); virtual ~CamHelper(); void SetCameraMode(const CameraMode &mode); MdParser &Parser() const { return *parser_; } uint32_t ExposureLines(double exposure_us) const; double Exposure(uint32_t exposure_lines) const; // in us virtual uint32_t GainCode(double gain) const = 0; virtual double Gain(uint32_t gain_code) const = 0; virtual void GetDelays(int &exposure_delay, int &gain_delay) const; virtual bool SensorEmbeddedDataPresent() const; virtual unsigned int HideFramesStartup() const; virtual unsigned int HideFramesModeSwitch() const; virtual unsigned int MistrustFramesStartup() const; virtual unsigned int MistrustFramesModeSwitch() const; virtual CamTransform GetOrientation() const; protected: MdParser *parser_; CameraMode mode_; bool initialized_; }; // This is for registering camera helpers with the system, so that the // CamHelper::Create function picks them up automatically. typedef CamHelper *(*CamHelperCreateFunc)(); struct RegisterCamHelper { RegisterCamHelper(char const *cam_name, CamHelperCreateFunc create_func); }; } // namespace RPi
path: root/include/linux/dma-heap.h
blob: 96b90cf0f8f728bfdd80f80ac30b88a28bd94904 (plain) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * DMABUF Heaps Userspace API
 *
 * Copyright (C) 2011 Google, Inc.
 * Copyright (C) 2019 Linaro Ltd.
 */
#ifndef _LINUX_DMABUF_POOL_H
#define _LINUX_DMABUF_POOL_H

#include <linux/ioctl.h>
#include <linux/types.h>

/**
 * DOC: DMABUF Heaps Userspace API
 */

/* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
#define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)

/* Currently no heap flags */
#define DMA_HEAP_VALID_HEAP_FLAGS (0)

/**
 * struct dma_heap_allocation_data - metadata passed from userspace for
 *                                      allocations
 * @len:		size of the allocation
 * @fd:			will be populated with a fd which provides the
 *			handle to the allocated dma-buf
 * @fd_flags:		file descriptor flags used when allocating
 * @heap_flags:		flags passed to heap
 *
 * Provided by userspace as an argument to the ioctl
 */
struct dma_heap_allocation_data {
	__u64 len;
	__u32 fd;
	__u32 fd_flags;
	__u64 heap_flags;
};

#define DMA_HEAP_IOC_MAGIC		'H'

/**
 * DOC: DMA_HEAP_IOCTL_ALLOC - allocate memory from pool
 *
 * Takes a dma_heap_allocation_data struct and returns it with the fd field
 * populated with the dmabuf handle of the allocation.
 */
#define DMA_HEAP_IOCTL_ALLOC	_IOWR(DMA_HEAP_IOC_MAGIC, 0x0,\
				      struct dma_heap_allocation_data)

#endif /* _LINUX_DMABUF_POOL_H */
generated by cgit v1.2.1 (git 2.18.0) at 2025-04-27 19:41:53 +0000