path: root/drivers/media/usb/uvc/uvcvideo.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _USB_VIDEO_H_
#define _USB_VIDEO_H_

#ifndef __KERNEL__
#error "The uvcvideo.h header is deprecated, use linux/uvcvideo.h instead."
#endif /* __KERNEL__ */

#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/usb.h>
#include <linux/usb/video.h>
#include <linux/uvcvideo.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <media/media-device.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fh.h>
#include <media/videobuf2-v4l2.h>

/* --------------------------------------------------------------------------
 * UVC constants
 */

#define UVC_TERM_INPUT			0x0000
#define UVC_TERM_OUTPUT			0x8000
#define UVC_TERM_DIRECTION(term)	((term)->type & 0x8000)

#define UVC_ENTITY_TYPE(entity)		((entity)->type & 0x7fff)
#define UVC_ENTITY_IS_UNIT(entity)	(((entity)->type & 0xff00) == 0)
#define UVC_ENTITY_IS_TERM(entity)	(((entity)->type & 0xff00) != 0)
#define UVC_ENTITY_IS_ITERM(entity) \
	(UVC_ENTITY_IS_TERM(entity) && \
	((entity)->type & 0x8000) == UVC_TERM_INPUT)
#define UVC_ENTITY_IS_OTERM(entity) \
	(UVC_ENTITY_IS_TERM(entity) && \
	((entity)->type & 0x8000) == UVC_TERM_OUTPUT)

#define UVC_EXT_GPIO_UNIT		0x7ffe
#define UVC_EXT_GPIO_UNIT_ID		0x100

/* ------------------------------------------------------------------------
 * Driver specific constants.
 */

#define DRIVER_VERSION		"1.1.1"

/* Number of isochronous URBs. */
#define UVC_URBS		5
/* Maximum number of packets per URB. */
#define UVC_MAX_PACKETS		32

#define UVC_CTRL_CONTROL_TIMEOUT	5000
#define UVC_CTRL_STREAMING_TIMEOUT	5000

/* Maximum allowed number of control mappings per device */
#define UVC_MAX_CONTROL_MAPPINGS	1024
#define UVC_MAX_CONTROL_MENU_ENTRIES	32

/* Devices quirks */
#define UVC_QUIRK_STATUS_INTERVAL	0x00000001
#define UVC_QUIRK_PROBE_MINMAX		0x00000002
#define UVC_QUIRK_PROBE_EXTRAFIELDS	0x00000004
#define UVC_QUIRK_BUILTIN_ISIGHT	0x00000008
#define UVC_QUIRK_STREAM_NO_FID		0x00000010
#define UVC_QUIRK_IGNORE_SELECTOR_UNIT	0x00000020
#define UVC_QUIRK_FIX_BANDWIDTH		0x00000080
#define UVC_QUIRK_PROBE_DEF		0x00000100
#define UVC_QUIRK_RESTRICT_FRAME_RATE	0x00000200
#define UVC_QUIRK_RESTORE_CTRLS_ON_INIT	0x00000400
#define UVC_QUIRK_FORCE_Y8		0x00000800
#define UVC_QUIRK_FORCE_BPP		0x00001000
#define UVC_QUIRK_WAKE_AUTOSUSPEND	0x00002000
#define UVC_QUIRK_NO_RESET_RESUME	0x00004000
#define UVC_QUIRK_DISABLE_AUTOSUSPEND	0x00008000
#define UVC_QUIRK_INVALID_DEVICE_SOF	0x00010000

/* Format flags */
#define UVC_FMT_FLAG_COMPRESSED		0x00000001
#define UVC_FMT_FLAG_STREAM		0x00000002

/* ------------------------------------------------------------------------
 * Structures.
 */

struct gpio_desc;
struct sg_table;
struct uvc_control;
struct uvc_device;
struct uvc_video_chain;

/*
 * TODO: Put the most frequently accessed fields at the beginning of
 * structures to maximize cache efficiency.
 */
struct uvc_control_info {
	struct list_head mappings;

	u8 entity[16];
	u8 index;	/* Bit index in bmControls */
	u8 selector;

	u16 size;
	u32 flags;
};

struct uvc_control_mapping {
	struct list_head list;
	struct list_head ev_subs;

	u32 id;
	char *name;
	u8 entity[16];
	u8 selector;

	u8 size;
	u8 offset;
	enum v4l2_ctrl_type v4l2_type;
	u32 data_type;

	const u32 *menu_mapping;
	const char (*menu_names)[UVC_MENU_NAME_LEN];
	unsigned long menu_mask;

	u32 master_id;
	s32 master_manual;
	u32 slave_ids[2];

	const struct uvc_control_mapping *(*filter_mapping)
				(struct uvc_video_chain *chain,
				struct uvc_control *ctrl);
	s32 (*get)(struct uvc_control_mapping *mapping, u8 query,
		   const u8 *data);
	void (*set)(struct uvc_control_mapping *mapping, s32 value,
		    u8 *data);
};

struct uvc_control {
	struct uvc_entity *entity;
	struct uvc_control_info info;

	u8 index;	/* Used to match the uvc_control entry with a uvc_control_info. */
	u8 dirty:1,
	   loaded:1,
	   modified:1,
	   cached:1,
	   initialized:1;

	u8 *uvc_data;

	struct uvc_fh *handle;	/* File handle that last changed the control. */
};

/*
 * The term 'entity' refers to both UVC units and UVC terminals.
 *
 * The type field is either the terminal type (wTerminalType in the terminal
 * descriptor), or the unit type (bDescriptorSubtype in the unit descriptor).
 * As the bDescriptorSubtype field is one byte long, the type value will
 * always have a null MSB for units. All terminal types defined by the UVC
 * specification have a non-null MSB, so it is safe to use the MSB to
 * differentiate between units and terminals as long as the descriptor parsing
 * code makes sure terminal types have a non-null MSB.
 *
 * For terminals, the type's most significant bit stores the terminal
 * direction (either UVC_TERM_INPUT or UVC_TERM_OUTPUT). The type field should
 * always be accessed with the UVC_ENTITY_* macros and never directly.
 */

#define UVC_ENTITY_FLAG_DEFAULT		(1 << 0)

struct uvc_entity {
	struct list_head list;		/* Entity as part of a UVC device. */
	struct list_head chain;		/* Entity as part of a video device chain. */
	unsigned int flags;

	/*
	 * Entities exposed by the UVC device use IDs 0-255, extra entities
	 * implemented by the driver (such as the GPIO entity) use IDs 256 and
	 * up.
	 */
	u16 id;
	u16 type;
	char name[64];
	u8 guid[16];

	/* Media controller-related fields. */
	struct video_device *vdev;
	struct v4l2_subdev subdev;
	unsigned int num_pads;
	unsigned int num_links;
	struct media_pad *pads;

	union {
		struct {
			u16 wObjectiveFocalLengthMin;
			u16 wObjectiveFocalLengthMax;
			u16 wOcularFocalLength;
			u8  bControlSize;
			u8  *bmControls;
		} camera;

		struct {
			u8  bControlSize;
			u8  *bmControls;
			u8  bTransportModeSize;
			u8  *bmTransportModes;
		} media;

		struct {
		} output;

		struct {
			u16 wMaxMultiplier;
			u8  bControlSize;
			u8  *bmControls;
			u8  bmVideoStandards;
		} processing;

		struct {
		} selector;

		struct {
			u8  bNumControls;
			u8  bControlSize;
			u8  *bmControls;
			u8  *bmControlsType;
		} extension;

		struct {
			u8  bControlSize;
			u8  *bmControls;
			struct gpio_desc *gpio_privacy;
			int irq;
		} gpio;
	};

	u8 bNrInPins;
	u8 *baSourceID;

	int (*get_info)(struct uvc_device *dev, struct uvc_entity *entity,
			u8 cs, u8 *caps);
	int (*get_cur)(struct uvc_device *dev, struct uvc_entity *entity,
		       u8 cs, void *data, u16 size);

	unsigned int ncontrols;
	struct uvc_control *controls;
};

struct uvc_frame {
	u8  bFrameIndex;
	u8  bmCapabilities;
	u16 wWidth;
	u16 wHeight;
	u32 dwMinBitRate;
	u32 dwMaxBitRate;
	u32 dwMaxVideoFrameBufferSize;
	u8  bFrameIntervalType;
	u32 dwDefaultFrameInterval;
	const u32 *dwFrameInterval;
};

struct uvc_format {
	u8 type;
	u8 index;
	u8 bpp;
	enum v4l2_colorspace colorspace;
	enum v4l2_xfer_func xfer_func;
	enum v4l2_ycbcr_encoding ycbcr_enc;
	u32 fcc;
	u32 flags;

	unsigned int nframes;
	const struct uvc_frame *frames;
};

struct uvc_streaming_header {
	u8 bNumFormats;
	u8 bEndpointAddress;
	u8 bTerminalLink;
	u8 bControlSize;
	u8 *bmaControls;
	/* The following fields are used by input headers only. */
	u8 bmInfo;
	u8 bStillCaptureMethod;
	u8 bTriggerSupport;
	u8 bTriggerUsage;
};

enum uvc_buffer_state {
	UVC_BUF_STATE_IDLE	= 0,
	UVC_BUF_STATE_QUEUED	= 1,
	UVC_BUF_STATE_ACTIVE	= 2,
	UVC_BUF_STATE_READY	= 3,
	UVC_BUF_STATE_DONE	= 4,
	UVC_BUF_STATE_ERROR	= 5,
};

struct uvc_buffer {
	struct vb2_v4l2_buffer buf;
	struct list_head queue;

	enum uvc_buffer_state state;
	unsigned int error;

	void *mem;
	unsigned int length;
	unsigned int bytesused;

	u32 pts;

	/* Asynchronous buffer handling. */
	struct kref ref;
};

#define UVC_QUEUE_DISCONNECTED		(1 << 0)
#define UVC_QUEUE_DROP_CORRUPTED	(1 << 1)

struct uvc_video_queue {
	struct vb2_queue queue;
	struct mutex mutex;			/* Protects queue */

	unsigned int flags;
	unsigned int buf_used;

	spinlock_t irqlock;			/* Protects irqqueue */
	struct list_head irqqueue;
};

struct uvc_video_chain {
	struct uvc_device *dev;
	struct list_head list;

	struct list_head entities;		/* All entities */
	struct uvc_entity *processing;		/* Processing unit */
	struct uvc_entity *selector;		/* Selector unit */

	struct mutex ctrl_mutex;		/* Protects ctrl.info */

	struct v4l2_prio_state prio;		/* V4L2 priority state */
	u32 caps;				/* V4L2 chain-wide caps */
	u8 ctrl_class_bitmap;			/* Bitmap of valid classes */
};

struct uvc_stats_frame {
	unsigned int size;		/* Number of bytes captured */
	unsigned int first_data;	/* Index of the first non-empty packet */

	unsigned int nb_packets;	/* Number of packets */
	unsigned int nb_empty;		/* Number of empty packets */
	unsigned int nb_invalid;	/* Number of packets with an invalid header */
	unsigned int nb_errors;		/* Number of packets with the error bit set */

	unsigned int nb_pts;		/* Number of packets with a PTS timestamp */
	unsigned int nb_pts_diffs;	/* Number of PTS di