/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* V4L2 sub-device support header.
*
* Copyright (C) 2008 Hans Verkuil <hverkuil@kernel.org>
*/
#ifndef _V4L2_SUBDEV_H
#define _V4L2_SUBDEV_H
#include <linux/types.h>
#include <linux/v4l2-subdev.h>
#include <media/media-entity.h>
#include <media/v4l2-async.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-mediabus.h>
/* generic v4l2_device notify callback notification values */
#define V4L2_SUBDEV_IR_RX_NOTIFY _IOW('v', 0, u32)
#define V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ 0x00000001
#define V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED 0x00000002
#define V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN 0x00000004
#define V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN 0x00000008
#define V4L2_SUBDEV_IR_TX_NOTIFY _IOW('v', 1, u32)
#define V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ 0x00000001
#define V4L2_DEVICE_NOTIFY_EVENT _IOW('v', 2, struct v4l2_event)
struct v4l2_device;
struct v4l2_ctrl_handler;
struct v4l2_event;
struct v4l2_event_subscription;
struct v4l2_fh;
struct v4l2_subdev;
struct v4l2_subdev_fh;
struct v4l2_subdev_stream_config;
struct tuner_setup;
struct v4l2_mbus_frame_desc;
struct led_classdev;
/**
* struct v4l2_decode_vbi_line - used to decode_vbi_line
*
* @is_second_field: Set to 0 for the first (odd) field;
* set to 1 for the second (even) field.
* @p: Pointer to the sliced VBI data from the decoder. On exit, points to
* the start of the payload.
* @line: Line number of the sliced VBI data (1-23)
* @type: VBI service type (V4L2_SLICED_*). 0 if no service found
*/
struct v4l2_decode_vbi_line {
u32 is_second_field;
u8 *p;
u32 line;
u32 type;
};
/*
* Sub-devices are devices that are connected somehow to the main bridge
* device. These devices are usually audio/video muxers/encoders/decoders or
* sensors and webcam controllers.
*
* Usually these devices are controlled through an i2c bus, but other buses
* may also be used.
*
* The v4l2_subdev struct provides a way of accessing these devices in a
* generic manner. Most operations that these sub-devices support fall in
* a few categories: core ops, audio ops, video ops and tuner ops.
*
* More categories can be added if needed, although this should remain a
* limited set (no more than approx. 8 categories).
*
* Each category has its own set of ops that subdev drivers can implement.
*
* A subdev driver can leave the pointer to the category ops NULL if
* it does not implement them (e.g. an audio subdev will generally not
* implement the video category ops). The exception is the core category:
* this must always be present.
*
* These ops are all used internally so it is no problem to change, remove
* or add ops or move ops from one to another category. Currently these
* ops are based on the original ioctls, but since ops are not limited to
* one argument there is room for improvement here once all i2c subdev
* drivers are converted to use these ops.
*/
/*
* Core ops: it is highly recommended to implement at least these ops:
*
* log_status
* g_register
* s_register
*
* This provides basic debugging support.
*
* The ioctl ops is meant for generic ioctl-like commands. Depending on
* the use-case it might be better to use subdev-specific ops (currently
* not yet implemented) since ops provide proper type-checking.
*/
/**
* enum v4l2_subdev_io_pin_bits - Subdevice external IO pin configuration
* bits
*
* @V4L2_SUBDEV_IO_PIN_DISABLE: disables a pin config. ENABLE assumed.
* @V4L2_SUBDEV_IO_PIN_OUTPUT: set it if pin is an output.
* @V4L2_SUBDEV_IO_PIN_INPUT: set it if pin is an input.
* @V4L2_SUBDEV_IO_PIN_SET_VALUE: to set the output value via
* &struct v4l2_subdev_io_pin_config->value.
* @V4L2_SUBDEV_IO_PIN_ACTIVE_LOW: pin active is bit 0.
* Otherwise, ACTIVE HIGH is assumed.
*/
enum v4l2_subdev_io_pin_bits {
V4L2_SUBDEV_IO_PIN_DISABLE = 0,
V4L2_SUBDEV_IO_PIN_OUTPUT = 1,
V4L2_SUBDEV_IO_PIN_INPUT = 2,
V4L2_SUBDEV_IO_PIN_SET_VALUE = 3,
V4L2_SUBDEV_IO_PIN_ACTIVE_LOW = 4,
};
/**
* struct v4l2_subdev_io_pin_config - Subdevice external IO pin configuration
*
* @flags: bitmask with flags for this pin's config, whose bits are defined by
* &enum v4l2_subdev_io_pin_bits.
* @pin: Chip external IO pin to configure
* @function: Internal signal pad/function to route to IO pin
* @value: Initial value for pin - e.g. GPIO output value
* @strength: Pin drive strength
*/
struct v4l2_subdev_io_pin_config {
u32 flags;
u8 pin;
u8 function;
u8 value;
u8 strength;
};
/**
* struct v4l2_subdev_core_ops - Define core ops callbacks for subdevs
*
* @log_status: callback for VIDIOC_LOG_STATUS() ioctl handler code.
*
* @s_io_pin_config: configure one or more chip I/O pins for chips that
* multiplex different internal signal pads out to IO pins. This function
* takes a pointer to an array of 'n' pin configuration entries, one for
* each pin being configured. This function could be called at times
* other than just subdevice initialization.
*
* @init: initialize the sensor registers to some sort of reasonable default
* values. Do not use for new drivers and should be removed in existing
* drivers.
*
* @load_fw: load firmware.
*
* @reset: generic reset command. The argument selects which subsystems to
* reset. Passing 0 will always reset the whole chip. Do not use for new
* drivers without discussing this first on the linux-media mailinglist.
* There should be no reason normally to reset a device.
*
* @s_gpio: set GPIO pins. Very simple right now, might need to be extended with
* a direction argument if needed.
*
* @command: called by in-kernel drivers in order to call functions internal
* to subdev drivers driver that have a separate callback.
*
* @ioctl: called at the end of ioctl() syscall handler at the V4L2 core.
* used to provide support for private ioctls used on the driver.
*
* @compat_ioctl32: called when a 32 bits application uses a 64 bits Kernel,
* in order to fix data passed from/to userspace.
*
* @g_register: callback for VIDIOC_DBG_G_REGISTER() ioctl handler code.
*
* @s_register: callback for VIDIOC_DBG_S_REGISTER() ioctl handler code.
*
* @s_power: puts subdevice in power saving mode (on == 0) or normal operation
* mode (on == 1). DEPRECATED. See
* Documentation/driver-api/media/camera-sensor.rst . pre_streamon and
* post_streamoff callbacks can be used for e.g. setting the bus to LP-11
* mode before s_stream is called.
*
* @interrupt_service_routine: Called by the bridge chip's interrupt service
* handler, when an interrupt status has be raised due to this subdev,
* so that this subdev can handle the details. It may schedule work to be
* performed later. It must not sleep. **Called from an IRQ context**.
*
* @subscribe_event: used by the drivers to request the control framework that
* for it to be warned when the value of a control changes.
*
* @unsubscribe_event: remove event subscription from the control framework.
*/
struct v4l2_subdev_core_ops {
int (*log_status)(struct v4l2_subdev *sd);
int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
struct v4l2_subdev_io_pin_config *pincfg);
int (*init)(struct v4l2_subdev *sd, u32 val);
int (*load_fw)(struct v4l2_subdev *sd);
int (*reset)(struct v4l2_subdev *sd, u32 val);
int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
long (*command)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg);
#ifdef CONFIG_COMPAT
long (*compat_ioctl32)(struct v4l2_subdev *sd, unsigned int cmd,
unsigned long arg);
#endif
#ifdef CONFIG_VIDEO_ADV_DEBUG
int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg);
int (*s_register)(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg);
#endif
int (*s_power)(struct v4l2_subdev *sd, int on);
int (*interrupt_service_routine)(struct v4l2_subdev *sd,
u32 status, bool *handled);
int (*subscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
int (*unsubscribe_event)(struct v4l2_subdev *sd, struct v4l2_fh *fh,
struct v4l2_event_subscription *sub);
};
/**
* struct v4l2_subdev_tuner_ops - Callbacks used when v4l device was opened
* in radio mode.
*
* @standby: puts the tuner in standby mode. It will be woken up
* automatically the next time it is used.
*
* @s_radio: callback that switches the tuner to radio mode.
* drivers should explicitly call it when a tuner ops should
* operate on radio mode, before being able to handle it.
* Used on devices that have both AM/FM radio receiver and TV.
*
* @s_frequency: callback for VIDIOC_S_FREQUENCY() ioctl handler code.
*
* @g_frequency: callback for VIDIOC_G_FREQUENCY() ioctl handler code.
* freq->type must be filled in. Normally done by video_ioctl2()
* or the bridge driver.
*
* @enum_freq_bands: callback for VIDIOC_ENUM_FREQ_BANDS() ioctl handler code.
*
* @g_tuner: callback for VIDIOC_G_TUNER() ioctl handler code.
*
* @s_tuner: callback for VIDIOC_S_TUNER() ioctl handler code. @vt->type must be
* filled in. Normally done by video_ioctl2 or the
* bridge driver.
*
* @g_modulator: callback for VIDIOC_G_MODULATOR() ioctl handler code.
*
* @s_modulator: callback for VIDIOC_S_MODULATOR() ioctl handler code.
*
* @s_type_addr: sets tuner type and its I2C addr.
*
* @s_config: sets tda9887 specific stuff, like port1, port2 and qss
*
* .. note::
*
* On devices that have both AM/FM and TV, it is up to the driver
* to explicitly call s_radio when the tuner should be switched to
* radio mode, before handling other &struct v4l2_subdev_tuner_ops
* that would require it. An example of such usage is::
*
* static void s_frequency(void *priv, const struct v4l2_frequency *f)
* {
* ...
* if (f.type == V4L2_TUNER_RADIO)
* v4l2_device_call_all(v4l2_dev, 0, tuner, s_radio);
* ...
* v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency);
* }
*/
struct v4l2_subdev_tuner_ops {
int (*standby)(struct v4l2_subdev *sd);
int (*s_radio)(struct v4l2_subdev *sd);
int (*s_frequency)(struct v4l2_subdev *sd, const struct v4l2_frequency *freq);
int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
int (*enum_freq_bands)(struct v4l2_subdev *sd, struct v4l2_frequency_band *band);
int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
int (*s_tuner)(struct v4l2_subdev *sd, const struct v4l2_tuner *vt);
int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm);
int (*s_modulator)(struct v4l2_subdev *sd, const struct v4l2_modulator *vm);
int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
};
/**
* struct v4l2_subdev_audio_ops - Callbacks used for audio-related settings
*
* @s_clock_freq: set the frequency (in Hz) of the audio clock output.
* Used to slave an audio processor to the video decoder, ensuring that
* audio and video remain synchronized. Usual values for the frequency
* are 48000, 44100 or 32000 Hz. If the frequency is not supported, then
* -EINVAL is returned.
*
* @s_i2s_clock_freq: sets I2S speed in bps. This is used to provide a standard
* way to select I2S clock used by driving digital audio streams at some
* board designs. Usual values for the frequency are 1024000 and 2048000.
* If the frequency is not supported, then %-EINVAL is returned.
*
* @s_routing: used to define the input and/or output pins of an audio chip,
* and any additional configuration data.
* Never attempt to use user-level input IDs (e.g. Composite, S-Video,
* Tuner) at this level. An i2c device shouldn't know about whether an
* input pin is connected to a Composite connector, become on another
* board or platform it might be connected to something else entirely.
* The calling driver is responsible for mapping a user-level input to
* the right pins on the i2c device.
*
* @s_stream: used to notify the audio code that stream will start or has
* stopped.
*/
struct v4l2_subdev_audio_ops {
int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
int (*s_stream)(struct v4l2_subdev *sd, int enable);
};
/**
* struct v4l2_mbus_frame_desc_entry_csi2
*
* @vc: CSI-2 virtual channel
* @dt: CSI-2 data type ID
*/
struct v4l2_mbus_frame_desc_entry_csi2 {
u8 vc;
u8 dt;
};
/**
* enum v4l2_mbus_frame_desc_flags - media bus frame description flags
*
* @V4L2_MBUS_FRAME_DESC_FL_LEN_MAX:
* Indicates that &struct v4l2_mbus_frame_desc_entry->length field
* specifies maximum data length.
* @V4L2_MBUS_FRAME_DESC_FL_BLOB:
* Indicates that the format does not have line offsets, i.e.
* the receiver should use 1D DMA.
*/
enum v4l2_mbus_frame_desc_flags {
V4L2_MBUS_FRAME_DESC_FL_LEN_MAX = BIT(0),
V4L2_MBUS_FRAME_DESC_FL_BLOB = BIT(1),
};
/**
* struct v4l2_mbus_frame_desc_entry - media bus frame description structure
*
* @flags: bitmask flags, as defined by &enum v4l2_mbus_frame_desc_flags.
* @stream: stream in routing configuration
* @pixelcode: media bus pixel code, valid if @flags
* %FRAME_DESC_FL_BLOB is not set.
* @length: number of octets per frame, valid if @flags
* %V4L2_MBUS_FRAME_DESC_FL_LEN_MAX is set.
* @bus: Bus-specific frame descriptor parameters
* @bus.csi2: CSI-2-specific bus configuration
*/
struct v4l2_mbus_frame_desc_entry {
enum v4l2_mbus_frame_desc_flags flags;
u32 stream;
u32 pixelcode;
u32 length;
union {
struct v4l2_mbus_frame_desc_entry_csi2 csi2;
} bus;
};
/*
* If this number is too small, it should be dropped altogether and the
* API switched to a dynamic number of frame descriptor entries.
*/
#define V4L2_FRAME_DESC_ENTRY_MAX 8
/**
* enum v4l2_mbus_frame_desc_type - media bus frame description type
*
* @V4L2_MBUS_FRAME_DESC_TYPE_UNDEFINED:
* Undefined frame desc type. Drivers should not use this, it is
* for backwards compatibility.
* @V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL:
* Parallel media bus.
* @V4L2_MBUS_FRAME_DESC_TYPE_CSI2:
* CSI-2 media bus. Frame desc parameters must be set in
* &struct v4l2_mbus_frame_desc_entry->csi2.
*/
enum v4l2_mbus_frame_desc_type {
V4L2_MBUS_FRAME_DESC_TYPE_UNDEFINED = 0,
V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL,
V4L2_MBUS_FRAME_DESC_TYPE_CSI2,
};
/**
* struct v4l2_mbus_frame_desc - media bus data frame description
* @type: type of the bus (enum v4l2_mbus_frame_desc_type)
* @entry: frame descriptors array
* @num_entries: number of entries in @entry array
*/
struct v4l2_mbus_frame_desc {
enum v4l2_mbus_frame_desc_type type;
struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
unsigned short num_entries;
};
/**
* enum v4l2_subdev_pre_streamon_flags - Flags for pre_streamon subdev core op
*
* @V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP: Set the transmitter to either LP-11
* or LP-111 mode before call to s_stream().
*/
enum v4l2_subdev_pre_streamon_flags {
V4L2_SUBDEV_PRE_STREAMON_FL_MANUAL_LP = BIT(0),
};
/**
* struct v4l2_subdev_video_ops - Callbacks used when v4l device was opened
* in video mode.
*
* @s_routing: see s_routing in audio_ops, except this version is for video
* devices.
*
* @s_crystal_freq: sets the frequency of the crystal used to generate the
* clocks in Hz. An extra flags field allows device specific configuration
* regarding clock frequency dividers, etc. If not used, then set flags
* to 0. If the frequency is not supported, then -EINVAL is returned.
*
* @g_std: callback for VIDIOC_G_STD() ioctl handler code.
*
* @s_std: callback for VIDIOC_S_STD() ioctl handler code.
*
* @s_std_output: set v4l2_std_id for video OUTPUT devices. This is ignored by
* video input devices.
*
* @g_std_output: get current standard for video OUTPUT devices. This is ignored
* by video input devices.
*
* @querystd: callback for VIDIOC_QUERYSTD() ioctl handler code.
*
* @g_tvnorms: get &v4l2_std_id with all standards supported by the video
* CAPTURE device. This is ignored by video output devices.
*
* @g_tvnorms_output: get v4l2_std_id with all standards supported by the video
* OUTPUT device. This is ignored by video capture devices.
*
* @g_input_status: get input status. Same as the status field in the
* &struct v4l2_input
*
* @s_stream: start (enabled == 1) or stop (enabled == 0) streaming on the
* sub-device. Failure on stop will remove any resources acquired in
* streaming start, while the error code is still returned by the driver.
* The caller shall track the subdev state, and shall not start or stop an
* already started or stopped subdev. Also see call_s_stream wrapper in
* v4l2-subdev.c.
*
* This callback is DEPRECATED. New drivers should instead implement
* &v4l2_subdev_pad_ops.enable_streams and
* &v4l2_subdev_pad_ops.disable_streams operations, and use
* v4l2_subdev_s_stream_helper for the &v4l2_subdev_video_ops.s_stream
* operation to support legacy users.
*
* Drivers should also not call the .s_stream() subdev operation directly,
* but use the v4l2_subdev_enable_streams() and
* v4l2_subdev_disable_streams() helpers.
*
* @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
* can adjust @size to a lower value and must not write more data to the
* buffer starting at @data than the original value of @size.
*
* @pre_streamon: May be called before streaming is actually started, to help
* initialising the bus. Current usage is to set a CSI-2 transmitter to
* LP-11 or LP-111 mode before streaming. See &enum
* v4l2_subdev_pre_streamon_flags.
*
* pre_streamon shall return error if it cannot perform the operation as
* indicated by the flags argument. In particular, -EACCES indicates lack
* of support for the operation. The caller shall call post_streamoff for
* each successful call of pre_streamon.
*
* @post_streamoff: Called after streaming is stopped, but if and only if
* pre_streamon was called earlier.
*/
struct v4l2_subdev_video_ops {
int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags);
int (*g_std)(struct v4l2_subdev *sd, v4l2_std_id *norm);
int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
int (*s_stream)(struct v4l2_subdev *sd, int enable);
int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
unsigned int *size);
int (*pre_streamon)(struct v4l2_subdev *sd, u32 flags);
int (*post_streamoff)(struct v4l2_subdev *sd);
};
/**
* struct v4l2_subdev_vbi_ops - Callbacks used when v4l device was opened
* in video mode via the vbi device node.
*
* @decode_vbi_line: video decoders that support sliced VBI need to implement
* this ioctl. Field p of the &struct v4l2_decode_vbi_line is set to the
* start of the VBI data that was generated by the decoder. The driver
* then parses the sliced VBI data and sets the other fields in the
* struct accordingly. The pointer p is updated to point to the start of
* the payload which can be copied verbatim into the data field of the
* &struct v4l2_sliced_vbi_data. If no valid VBI data was found, then the
* type field is set to 0 on return.
*
* @s_vbi_data: used to generate VBI signals on a video signal.
* &struct v4l2_sliced_vbi_data is filled with the data packets that
* should be output. Note that if you set the line field to 0, then that
* VBI signal is disabled. If no valid VBI data was found, then the type
* field is set to 0 on return.
*
* @g_vbi_data: used to obtain the sliced VBI packet from a readback register.
* Not all video decoders support this. If no data is available because
* the readback register contains invalid or erroneous data %-EIO is
* returned. Note that you must fill in the 'id' member and the 'field'
* member (to determine whether CC data from the first or second field
* should be obtained).
*
* @g_sliced_vbi_cap: callback for VIDIOC_G_SLICED_VBI_CAP() ioctl handler
* code.
*
* @s_raw_fmt: setup the video encoder/decoder for raw VBI.
*
* @g_sliced_fmt: retrieve the current sliced VBI settings.
*
* @s_sliced_fmt: setup the sliced VBI settings.
*/
struct v4l2_subdev_vbi_ops {
int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
int (*g_sliced_vbi_cap)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_cap *cap);
int (*s_raw_fmt)(struct v4l2_subdev *sd, struct v4l2_vbi_format *fmt);
int (*g_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
int (*s_sliced_fmt)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt);
};
/**
* struct v4l2_subdev_sensor_ops - v4l2-subdev sensor operations
* @g_skip_top_lines: number of lines at the top of the image to be skipped.
* This is needed for some sensors, which always corrupt
* several top lines of the output image, or which send their
* metadata in them.
* @g_skip_frames: number of frames to skip at stream start. This is needed for
* buggy sensors that generate faulty frames when they are
* turned on.
*/
struct v4l2_subdev_sensor_ops {
int (*g_skip_top_lines)(struct v4l2_subdev *sd, u32 *lines);
int (*g_skip_frames)(struct v4l2_subdev *sd, u32 *frames);
};
/**
* enum v4l2_subdev_ir_mode- describes the type of IR supported
*
* @V4L2_SUBDEV_IR_MODE_PULSE_WIDTH: IR uses struct ir_raw_event records
*/
enum v4l2_subdev_ir_mode {
V4L2_SUBDEV_IR_MODE_PULSE_WIDTH,
};
/**
* struct v4l2_subdev_ir_parameters - Parameters for IR TX or TX
*
* @bytes_per_data_element: bytes per data element of data in read or
* write call.
* @mode: IR mode as defined by &enum v4l2_subdev_ir_mode.
* @enable: device is active if true
* @interrupt_enable: IR interrupts are enabled if true
* @shutdown: if true: set hardware to low/no power, false: normal mode
*
* @modulation: if true, it uses carrier, if false: baseband
* @max_pulse_width: maximum pulse width in ns, valid only for baseband signal
* @carrier_freq: carrier frequency in Hz, valid only for modulated signal
* @duty_cycle: duty cycle percentage, valid only for modulated signal
* @invert_level: invert signal level
*
* @invert_carrier_sense: Send 0/space as a carrier burst. used only in TX.
*
* @noise_filter_min_width: min time of a valid pulse, in ns. Used only for RX.
* @carrier_range_lower: Lower carrier range, in Hz, valid only for modulated
* signal. Used only for RX.
* @carrier_range_upper: Upper carrier range, in Hz, valid only for modulated
* signal. Used only for RX.
* @resolution: The receive resolution, in ns . Used only for RX.
*/
struct v4l2_subdev_ir_parameters {
unsigned int bytes_per_data_element;
enum v4l2_subdev_ir_mode mode;
bool enable;
bool interrupt_enable;
bool shutdown;
bool modulation;
u32 max_pulse_width;
unsigned int carrier_freq;
unsigned int duty_cycle;
bool invert_level;
/* Tx only */
bool invert_carrier_sense;
/* Rx only */
u32 noise_filter_min_width;
unsigned int carrier_range_lower;
unsigned int carrier_range_upper;
u32 resolution;
};
/**
* struct v4l2_subdev_ir_ops - operations for IR subdevices
*
* @rx_read: Reads received codes or pulse width data.
* The semantics are similar to a non-blocking read() call.
* @rx_g_parameters: Get the current operating parameters and state of
* the IR receiver.
* @rx_s_parameters: Set the current operating parameters and state of
* the IR receiver. It is recommended to call
* [rt]x_g_parameters first to fill out the current state, and only change
* the fields that need to be changed. Upon return, the actual device
* operating parameters and state will be returned. Note that hardware
* limitations may prevent the actual settings from matching the requested
* settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
* was requested. An exception is when the shutdown parameter is true.
* The last used operational parameters will be returned, but the actual
* state of the hardware be different to minimize power consumption and
* processing when shutdown is true.
*
* @tx_write: Writes codes or pulse width data for transmission.
* The semantics are similar to a non-blocking write() call.
* @tx_g_parameters: Get the current operating parameters and state of
* the IR transmitter.
* @tx_s_parameters: Set the current operating parameters and state of
* the IR transmitter. It is recommended to call
* [rt]x_g_parameters first to fill out the current state, and only change
* the fields that need to be changed. Upon return, the actual device
* operating parameters and state will be returned. Note that hardware
* limitations may prevent the actual settings from matching the requested
* settings - e.g. an actual carrier setting of 35,904 Hz when 36,000 Hz
* was requested. An exception is when the shutdown parameter is true.
* The last used operational parameters will be returned, but the actual
* state of the hardware be different to minimize power consumption and
* processing when shutdown is true.
*/
struct v4l2_subdev_ir_ops {
/* Receiver */
int (*rx_read)(struct v4l2_subdev *sd, u8 *buf, size_t count,
ssize_t *num);
int (*rx_g_parameters)(struct v4l2_subdev *sd,
struct v4l2_subdev_ir_parameters *params);
int (*rx_s_parameters)(struct v4l2_subdev *sd,
struct v4l2_subdev_ir_parameters *params);
/* Transmitter */
int (*tx_write)(struct v4l2_subdev *sd, u8 *buf, size_t count,
ssize_t *num);
int (*tx_g_parameters)(struct v4l2_subdev *sd,
struct v4l2_subdev_ir_parameters *params);
int (*tx_s_parameters)(struct v4l2_subdev *sd,
struct v4l2_subdev_ir_parameters *params);
};
/**
* struct v4l2_subdev_pad_config - Used for storing subdev pad information.
*
* @format: &struct v4l2_mbus_framefmt
* @crop: &struct v4l2_rect to be used for crop
* @compose: &struct v4l2_rect to be used for compose
* @interval: frame interval
*/
struct v4l2_subdev_pad_config {
struct v4l2_mbus_framefmt format;
struct v4l2_rect crop;
struct v4l2_rect compose;
struct v4l2_fract interval;
};
/**
* struct v4l2_subdev_stream_configs - A collection of stream configs.
*
* @num_configs: number of entries in @config.
* @configs: an array of &struct v4l2_subdev_stream_configs.
*/
struct v4l2_subdev_stream_configs {
u32 num_configs;
struct v4l2_subdev_stream_config *configs;
};
/**
* struct v4l2_subdev_krouting - subdev routing table
*
* @len_routes: length of routes array, in routes
* @num_routes: number of routes
* @routes: &struct v4l2_subdev_route
*
* This structure contains the routing table for a subdev.
*/
struct v4l2_subdev_krouting {
unsigned int len_routes;
unsigned int num_routes;
struct v4l2_subdev_route *routes;
};
/**
* struct v4l2_subdev_state - Used for storing subdev state information.
*
* @_lock: default for 'lock'
* @lock: mutex for the state. May be replaced by the user.
* @sd: the sub-device which the state is related to
* @pads: &struct v4l2_subdev_pad_config array
* @routing: routing table for the subdev
* @stream_configs: stream configurations (only for V4L2_SUBDEV_FL_STREAMS)
*
* This structure only needs to be passed to the pad op if the 'which' field
* of the main argument is set to %V4L2_SUBDEV_FORMAT_TRY. For
* %V4L2_SUBDEV_FORMAT_ACTIVE it is safe to pass %NULL.
*/
struct v4l2_subdev_state {
/* lock for the struct v4l2_subdev_state fields */
struct mutex _lock;
struct mutex *lock;
struct v4l2_subdev *sd;
struct v4l2_subdev_pad_config *pads;
struct v4l2_subdev_krouting routing;
struct v4l2_subdev_stream_configs stream_configs;
};
/**
* struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
*
* @enum_mbus_code: callback for VIDIOC_SUBDEV_ENUM_MBUS_CODE() ioctl handler
* code.
* @enum_frame_size: callback for VIDIOC_SUBDEV_ENUM_FRAME_SIZE() ioctl handler
* code.
*
* @enum_frame_interval: callback for VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL() ioctl
* handler code.
*
* @get_fmt: callback for VIDIOC_SUBDEV_G_FMT() ioctl handler code.
*
* @set_fmt: callback for VIDIOC_SUBDEV_S_FMT() ioctl handler code.
*
* @get_selection: callback for VIDIOC_SUBDEV_G_SELECTION() ioctl handler code.
*
* @set_selection: callback for VIDIOC_SUBDEV_S_SELECTION() ioctl handler code.
*
* @get_frame_interval: callback for VIDIOC_SUBDEV_G_FRAME_INTERVAL()
* ioctl handler code.
*
* @set_frame_interval: callback for VIDIOC_SUBDEV_S_FRAME_INTERVAL()
* ioctl handler code.
*
* @get_edid: callback for VIDIOC_SUBDEV_G_EDID() ioctl handler code.
*
* @set_edid: callback for VIDIOC_SUBDEV_S_EDID() ioctl handler code.
*
* @s_dv_timings: Set custom dv timings in the sub device. This is used
* when sub device is capable of setting detailed timing information
* in the hardware to generate/detect the video signal.
*
* @g_dv_timings: Get custom dv timings in the sub device.
*
* @query_dv_timings: callback for VIDIOC_QUERY_DV_TIMINGS() ioctl handler code.
*
* @dv_timings_cap: callback for VIDIOC_SUBDEV_DV_TIMINGS_CAP() ioctl handler
* code.
*
* @enum_dv_timings: callback for VIDIOC_SUBDEV_ENUM_DV_TIMINGS() ioctl handler
* code.
*
* @link_validate: used by the media controller code to check if the links
* that belongs to a pipeline can be used for stream.
*
* @get_frame_desc: get the current low level media bus frame parameters.
*
* @set_frame_desc: set the low level media bus frame parameters, @fd array
* may be adjusted by the subdev driver to device capabilities.
*
* @get_mbus_config: get the media bus configuration of a remote sub-device.
* The media bus configuration is usually retrieved from the
* firmware interface at sub-device probe time, immediately
* applied to the hardware and eventually adjusted by the
* driver. Remote sub-devices (usually video receivers) shall
* use this operation to query the transmitting end bus
* configuration in order to adjust their own one accordingly.
* Callers should make sure they get the most up-to-date as
* possible configuration from the remote end, likely calling
* this operation as close as possible to stream on time. The
* operation shall fail if the pad index it has been called on
* is not valid or in case of unrecoverable failures. The
* config argument has been memset to 0 just before calling
* the op.
*
* @set_routing: Enable or disable data connection routes described in the
* subdevice routing table. Subdevs that implement this operation
* must set the V4L2_SUBDEV_FL_STREAMS flag.
*
* @enable_streams: Enable the streams defined in streams_mask on the given
* source pad. Subdevs that implement this operation must use the active
* state management provided by the subdev core (enabled through a call to
* v4l2_subdev_init_finalize() at initialization time). Do not call
* directly, use v4l2_subdev_enable_streams() instead.
*
* Drivers that support only a single stream without setting the
* V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask
* argument.
*
* @disable_streams: Disable the streams defined in streams_mask on the given
* source pad. Subdevs that implement this operation must use the active
* state management provided by the subdev core (enabled through a call to
* v4l2_subdev_init_finalize() at initialization time). Do not call
* directly, use v4l2_subdev_disable_streams() instead.
*
* Drivers that support only a single stream without setting the
* V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask
* argument.
*/
struct v4l2_subdev_pad_ops {
int (*enum_mbus_code)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_mbus_code_enum *code);
int (*enum_frame_size)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_size_enum *fse);
int (*enum_frame_interval)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval_enum *fie);
int (*get_fmt)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format);
int (*set_fmt)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format);
int (*get_selection)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_selection *sel);
int (*set_selection)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_selection *sel);
int (*get_frame_interval)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *interval);
int (*set_frame_interval)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *interval);
int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
int (*s_dv_timings)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_dv_timings *timings);
int (*g_dv_timings)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_dv_timings *timings);
int (*query_dv_timings)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_dv_timings *timings);
int (*dv_timings_cap)(struct v4l2_subdev *sd,
struct v4l2_dv_timings_cap *cap);
int (*enum_dv_timings)(struct v4l2_subdev *sd,
struct v4l2_enum_dv_timings *timings);
#ifdef CONFIG_MEDIA_CONTROLLER
int (*link_validate)(struct v4l2_subdev *sd, struct media_link *link,
struct v4l2_subdev_format *source_fmt,
struct v4l2_subdev_format *sink_fmt);
#endif /* CONFIG_MEDIA_CONTROLLER */
int (*get_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd);
int (*set_frame_desc)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd);
int (*get_mbus_config)(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_config *config);
int (*set_routing)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
enum v4l2_subdev_format_whence which,
struct v4l2_subdev_krouting *route);
int (*enable_streams)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state, u32 pad,
u64 streams_mask);
int (*disable_streams)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state, u32 pad,
u64 streams_mask);
};
/**
* struct v4l2_subdev_ops - Subdev operations
*
* @core: pointer to &struct v4l2_subdev_core_ops. Can be %NULL
* @tuner: pointer to &struct v4l2_subdev_tuner_ops. Can be %NULL
* @audio: pointer to &struct v4l2_subdev_audio_ops. Can be %NULL
* @video: pointer to &struct v4l2_subdev_video_ops. Can be %NULL
* @vbi: pointer to &struct v4l2_subdev_vbi_ops. Can be %NULL
* @ir: pointer to &struct v4l2_subdev_ir_ops. Can be %NULL
* @sensor: pointer to &struct v4l2_subdev_sensor_ops. Can be %NULL
* @pad: pointer to &struct v4l2_subdev_pad_ops. Can be %NULL
*/
struct v4l2_subdev_ops {
const struct v4l2_subdev_core_ops *core;
const struct v4l2_subdev_tuner_ops *tuner;
const struct v4l2_subdev_audio_ops *audio;
const struct v4l2_subdev_video_ops *video;
const struct v4l2_subdev_vbi_ops *vbi;
const struct v4l2_subdev_ir_ops *ir;
const struct v4l2_subdev_sensor_ops *sensor;
const struct v4l2_subdev_pad_ops *pad;
};
/**
* struct v4l2_subdev_internal_ops - V4L2 subdev internal ops
*
* @init_state: initialize the subdev state to default values
*
* @registered: called when this subdev is registered. When called the v4l2_dev
* field is set to the correct v4l2_device.
*
* @unregistered: called when this subdev is unregistered. When called the
* v4l2_dev field is still set to the correct v4l2_device.
*
* @open: called when the subdev device node is opened by an application.
*
* @close: called when the subdev device node is closed. Please note that
* it is possible for @close to be called after @unregistered!
*
* @release: called when the last user of the subdev device is gone. This
* happens after the @unregistered callback and when the last open
* filehandle to the v4l-subdevX device node was closed. If no device
* node was created for this sub-device, then the @release callback
* is called right after the @unregistered callback.
* The @release callback is typically used to free the memory containing
* the v4l2_subdev structure. It is almost certainly required for any
* sub-device that sets the V4L2_SUBDEV_FL_HAS_DEVNODE flag.
*
* .. note::
* Never call this from drivers, only the v4l2 framework can call
* these ops.
*/
struct v4l2_subdev_internal_ops {
int (*init_state)(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state);
int (*registered)(struct v4l2_subdev *sd);
void (*unregistered)(struct v4l2_subdev *sd);
int (*open)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
int (*close)(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh);
void (*release)(struct v4l2_subdev *sd);
};
/* Set this flag if this subdev is a i2c device. */
#define V4L2_SUBDEV_FL_IS_I2C (1U << 0)
/* Set this flag if this subdev is a spi device. */
#define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
/* Set this flag if this subdev needs a device node. */
#define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2)
/*
* Set this flag if this subdev generates events.
* Note controls can send events, thus drivers exposing controls
* should set this flag.
*/
#define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
/*
* Set this flag if this subdev supports multiplexed streams. This means
* that the driver supports routing and handles the stream parameter in its
* v4l2_subdev_pad_ops handlers. More specifically, this means:
*
* - Centrally managed subdev active state is enabled
* - Legacy pad config is _not_ supported (state->pads is NULL)
* - Routing ioctls are available
* - Multiple streams per pad are supported
*/
#define V4L2_SUBDEV_FL_STREAMS (1U << 4)
struct regulator_bulk_data;
/**
* struct v4l2_subdev_platform_data - regulators config struct
*
* @regulators: Optional regulators used to power on/off the subdevice
* @num_regulators: Number of regululators
* @host_priv: Per-subdevice data, specific for a certain video host device
*/
struct v4l2_subdev_platform_data {
struct regulator_bulk_data *regulators;
int num_regulators;
void *host_priv;
};
/**
* struct v4l2_subdev - describes a V4L2 sub-device
*
* @entity: pointer to &struct media_entity
* @list: List of sub-devices
* @owner: The owner is the same as the driver's &struct device owner.
* @owner_v4l2_dev: true if the &sd->owner matches the owner of @v4l2_dev->dev
* owner. Initialized by v4l2_device_register_subdev().
* @flags: subdev flags. Can be:
* %V4L2_SUBDEV_FL_IS_I2C - Set this flag if this subdev is a i2c device;
* %V4L2_SUBDEV_FL_IS_SPI - Set this flag if this subdev is a spi device;
* %V4L2_SUBDEV_FL_HAS_DEVNODE - Set this flag if this subdev needs a
* device node;
* %V4L2_SUBDEV_FL_HAS_EVENTS - Set this flag if this subdev generates
* events.
*
* @v4l2_dev: pointer to struct &v4l2_device
* @ops: pointer to struct &v4l2_subdev_ops
* @internal_ops: pointer to struct &v4l2_subdev_internal_ops.
* Never call these internal ops from within a driver!
* @ctrl_handler: The control handler of this subdev. May be NULL.
* @name: Name of the sub-device. Please notice that the name must be unique.
* @grp_id: can be used to group similar subdevs. Value is driver-specific
* @dev_priv: pointer to private data
* @host_priv: pointer to private data used by the device where the subdev
* is attached.
* @devnode: subdev device node
* @dev: pointer to the physical device, if any
* @fwnode: The fwnode_handle of the subdev, usually the same as
* either dev->of_node->fwnode or dev->fwnode (whichever is non-NULL).
* @async_list: Links this subdev to a global subdev_list or
* @notifier->done_list list.
* @async_subdev_endpoint_list: List entry in async_subdev_endpoint_entry of
* &struct v4l2_async_subdev_endpoint.
* @subdev_notifier: A sub-device notifier implicitly registered for the sub-
* device using v4l2_async_register_subdev_sensor().
* @asc_list: Async connection list, of &struct
* v4l2_async_connection.subdev_entry.
* @pdata: common part of subdevice platform data
* @state_lock: A pointer to a lock used for all the subdev's states, set by the
* driver. This is optional. If NULL, each state instance will get
* a lock of its own.
* @privacy_led: Optional pointer to a LED classdev for the privacy LED for sensors.
* @active_state: Active state for the subdev (NULL for subdevs tracking the
* state internally). Initialized by calling
* v4l2_subdev_init_finalize().
* @enabled_pads: Bitmask of enabled pads used by v4l2_subdev_enable_streams()
* and v4l2_subdev_disable_streams() helper functions for
* fallback cases.
* @s_stream_enabled: Tracks whether streaming has been enabled with s_stream.
* This is only for call_s_stream() internal use.
*
* Each instance of a subdev driver should create this struct, either
* stand-alone or embedded in a larger struct.
*
* This structure should be initialized by v4l2_subdev_init() or one of
* its variants: v4l2_spi_subdev_init(), v4l2_i2c_subdev_init().
*/
struct v4l2_subdev {
#if defined(CONFIG_MEDIA_CONTROLLER)
struct media_entity entity;
#endif
struct list_head list;
struct module *owner;
bool owner_v4l2_dev;
u32 flags;
struct v4l2_device *v4l2_dev;
const struct v4l2_subdev_ops *ops;
const struct v4l2_subdev_internal_ops *internal_ops;
struct v4l2_ctrl_handler *ctrl_handler;
char name[52];
u32 grp_id;
void *dev_priv;
void *host_priv;
struct video_device *devnode;
struct device *dev;
struct fwnode_handle *fwnode;
struct list_head async_list;
struct list_head async_subdev_endpoint_list;
struct v4l2_async_notifier *subdev_notifier;
struct list_head asc_list;
struct v4l2_subdev_platform_data *pdata;
struct mutex *state_lock;
/*
* The fields below are private, and should only be accessed via
* appropriate functions.
*/
struct led_classdev *privacy_led;
/*
* TODO: active_state should most likely be changed from a pointer to an
* embedded field. For the time being it's kept as a pointer to more
* easily catch uses of active_state in the cases where the driver
* doesn't support it.
*/
struct v4l2_subdev_state *active_state;
u64 enabled_pads;
bool s_stream_enabled;
};
/**
* media_entity_to_v4l2_subdev - Returns a &struct v4l2_subdev from
* the &struct media_entity embedded in it.
*
* @ent: pointer to &struct media_entity.
*/
#define media_entity_to_v4l2_subdev(ent) \
({ \
typeof(ent) __me_sd_ent = (ent); \
\
__me_sd_ent ? \
container_of_const(__me_sd_ent, struct v4l2_subdev, entity) : \
NULL; \
})
/**
* vdev_to_v4l2_subdev - Returns a &struct v4l2_subdev from
* the &struct video_device embedded on it.
*
* @vdev: pointer to &struct video_device
*/
#define vdev_to_v4l2_subdev(vdev) \
((struct v4l2_subdev *)video_get_drvdata(vdev))
/**
* struct v4l2_subdev_fh - Used for storing subdev information per file handle
*
* @vfh: pointer to &struct v4l2_fh
* @state: pointer to &struct v4l2_subdev_state
* @owner: module pointer to the owner of this file handle
* @client_caps: bitmask of ``V4L2_SUBDEV_CLIENT_CAP_*``
*/
struct v4l2_subdev_fh {
struct v4l2_fh vfh;
struct module *owner;
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
struct v4l2_subdev_state *state;
u64 client_caps;
#endif
};
/**
* to_v4l2_subdev_fh - Returns a &struct v4l2_subdev_fh from
* the &struct v4l2_fh embedded on it.
*
* @fh: pointer to &struct v4l2_fh
*/
#define to_v4l2_subdev_fh(fh) \
container_of(fh, struct v4l2_subdev_fh, vfh)
extern const struct v4l2_file_operations v4l2_subdev_fops;
/**
* v4l2_set_subdevdata - Sets V4L2 dev private device data
*
* @sd: pointer to &struct v4l2_subdev
* @p: pointer to the private device data to be stored.
*/
static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
{
sd->dev_priv = p;
}
/**
* v4l2_get_subdevdata - Gets V4L2 dev private device data
*
* @sd: pointer to &struct v4l2_subdev
*
* Returns the pointer to the private device data to be stored.
*/
static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
{
return sd->dev_priv;
}
/**
* v4l2_set_subdev_hostdata - Sets V4L2 dev private host data
*
* @sd: pointer to &struct v4l2_subdev
* @p: pointer to the private data to be stored.
*/
static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
{
sd->host_priv = p;
}
/**
* v4l2_get_subdev_hostdata - Gets V4L2 dev private data
*
* @sd: pointer to &struct v4l2_subdev
*
* Returns the pointer to the private host data to be stored.
*/
static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
{
return sd->host_priv;
}
#ifdef CONFIG_MEDIA_CONTROLLER
/**
* v4l2_subdev_get_fwnode_pad_1_to_1 - Get pad number from a subdev fwnode
* endpoint, assuming 1:1 port:pad
*
* @entity: Pointer to the subdev entity
* @endpoint: Pointer to a parsed fwnode endpoint
*
* This function can be used as the .get_fwnode_pad operation for
* subdevices that map port numbers and pad indexes 1:1. If the endpoint
* is owned by the subdevice, the function returns the endpoint port
* number.
*
* Returns the endpoint port number on success or a negative error code.
*/
int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
struct fwnode_endpoint *endpoint);
/**
* v4l2_subdev_link_validate_default - validates a media link
*
* @sd: pointer to &struct v4l2_subdev
* @link: pointer to &struct media_link
* @source_fmt: pointer to &struct v4l2_subdev_format
* @sink_fmt: pointer to &struct v4l2_subdev_format
*
* This function ensures that width, height and the media bus pixel
* code are equal on both source and sink of the link.
*/
int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
struct media_link *link,
struct v4l2_subdev_format *source_fmt,
struct v4l2_subdev_format *sink_fmt);
/**
* v4l2_subdev_link_validate - validates a media link
*
* @link: pointer to &struct media_link
*
* This function calls the subdev's link_validate ops to validate
* if a media link is valid for streaming. It also internally
* calls v4l2_subdev_link_validate_default() to ensure that
* width, height and the media bus pixel code are equal on both
* source and sink of the link.
*
* The function can be used as a drop-in &media_entity_ops.link_validate
* implementation for v4l2_subdev instances. It supports all links between
* subdevs, as well as links between subdevs and video devices, provided that
* the video devices also implement their &media_entity_ops.link_validate
* operation.
*/
int v4l2_subdev_link_validate(struct media_link *link);
/**
* v4l2_subdev_has_pad_interdep - MC has_pad_interdep implementation for subdevs
*
* @entity: pointer to &struct media_entity
* @pad0: pad number for the first pad
* @pad1: pad number for the second pad
*
* This function is an implementation of the
* media_entity_operations.has_pad_interdep operation for subdevs that
* implement the multiplexed streams API (as indicated by the
* V4L2_SUBDEV_FL_STREAMS subdev flag).
*
* It considers two pads interdependent if there is an active route between pad0
* and pad1.
*/
bool v4l2_subdev_has_pad_interdep(struct media_entity *entity,
unsigned int pad0, unsigned int pad1);
/**
* __v4l2_subdev_state_alloc - allocate v4l2_subdev_state
*
* @sd: pointer to &struct v4l2_subdev for which the state is being allocated.
* @lock_name: name of the state lock
* @key: lock_class_key for the lock
*
* Must call __v4l2_subdev_state_free() when state is no longer needed.
*
* Not to be called directly by the drivers.
*/
struct v4l2_subdev_state *__v4l2_subdev_state_alloc(struct v4l2_subdev *sd,
const char *lock_name,
struct lock_class_key *key);
/**
* __v4l2_subdev_state_free - free a v4l2_subdev_state
*
* @state: v4l2_subdev_state to be freed.
*
* Not to be called directly by the drivers.
*/
void __v4l2_subdev_state_free(struct v4l2_subdev_state *state);
/**
* v4l2_subdev_init_finalize() - Finalizes the initialization of the subdevice
* @sd: The subdev
*
* This function finalizes the initialization of the subdev, including
* allocation of the active state for the subdev.
*
* This function must be called by the subdev drivers that use the centralized
* active state, after the subdev struct has been initialized and
* media_entity_pads_init() has been called, but before registering the
* subdev.
*
* The user must call v4l2_subdev_cleanup() when the subdev is being removed.
*/
#define v4l2_subdev_init_finalize(sd) \
({ \
static struct lock_class_key __key; \
const char *name = KBUILD_BASENAME \
":" __stringify(__LINE__) ":sd->active_state->lock"; \
__v4l2_subdev_init_finalize(sd, name, &__key); \
})
int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
struct lock_class_key *key);
/**
* v4l2_subdev_cleanup() - Releases the resources allocated by the subdevice
* @sd: The subdevice
*
* Clean up a V4L2 async sub-device. Must be called for a sub-device as part of
* its release if resources have been associated with it using
* v4l2_async_subdev_endpoint_add() or v4l2_subdev_init_finalize().
*/
void v4l2_subdev_cleanup(struct v4l2_subdev *sd);
/*
* A macro to generate the macro or function name for sub-devices state access
* wrapper macros below.
*/
#define __v4l2_subdev_state_gen_call(NAME, _1, ARG, ...) \
__v4l2_subdev_state_get_ ## NAME ## ARG
/*
* A macro to constify the return value of the state accessors when the state
* parameter is const.
*/
#define __v4l2_subdev_state_constify_ret(state, value) \
_Generic(state, \
const struct v4l2_subdev_state *: (const typeof(*(value)) *)(value), \
struct v4l2_subdev_state *: (value) \
)
/**
* v4l2_subdev_state_get_format() - Get pointer to a stream format
* @state: subdevice state
* @pad: pad id
* @...: stream id (optional argument)
*
* This returns a pointer to &struct v4l2_mbus_framefmt for the given pad +
* stream in the subdev state.
*
* For stream-unaware drivers the format for the corresponding pad is returned.
* If the pad does not exist, NULL is returned.
*/
/*
* Wrap v4l2_subdev_state_get_format(), allowing the function to be called with
* two or three arguments. The purpose of the __v4l2_subdev_state_gen_call()
* macro is to come up with the name of the function or macro to call, using
* the last two arguments (_stream and _pad). The selected function or macro is
* then called using the arguments specified by the caller. The
* __v4l2_subdev_state_constify_ret() macro constifies the returned pointer
* when the state is const, allowing the state accessors to guarantee
* const-correctness in all cases.
*
* A similar arrangement is used for v4l2_subdev_state_crop(),
* v4l2_subdev_state_compose() and v4l2_subdev_state_get_interval() below.
*/
#define v4l2_subdev_state_get_format(state, pad, ...) \
__v4l2_subdev_state_constify_ret(state, \
__v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad) \
((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
#define __v4l2_subdev_state_get_format_pad(state, pad) \
__v4l2_subdev_state_get_format(state, pad, 0)
struct v4l2_mbus_framefmt *
__v4l2_subdev_state_get_format(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream);
/**
* v4l2_subdev_state_get_crop() - Get pointer to a stream crop rectangle
* @state: subdevice state
* @pad: pad id
* @...: stream id (optional argument)
*
* This returns a pointer to crop rectangle for the given pad + stream in the
* subdev state.
*
* For stream-unaware drivers the crop rectangle for the corresponding pad is
* returned. If the pad does not exist, NULL is returned.
*/
#define v4l2_subdev_state_get_crop(state, pad, ...) \
__v4l2_subdev_state_constify_ret(state, \
__v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad) \
((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
#define __v4l2_subdev_state_get_crop_pad(state, pad) \
__v4l2_subdev_state_get_crop(state, pad, 0)
struct v4l2_rect *
__v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
u32 stream);
/**
* v4l2_subdev_state_get_compose() - Get pointer to a stream compose rectangle
* @state: subdevice state
* @pad: pad id
* @...: stream id (optional argument)
*
* This returns a pointer to compose rectangle for the given pad + stream in the
* subdev state.
*
* For stream-unaware drivers the compose rectangle for the corresponding pad is
* returned. If the pad does not exist, NULL is returned.
*/
#define v4l2_subdev_state_get_compose(state, pad, ...) \
__v4l2_subdev_state_constify_ret(state, \
__v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad) \
((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
#define __v4l2_subdev_state_get_compose_pad(state, pad) \
__v4l2_subdev_state_get_compose(state, pad, 0)
struct v4l2_rect *
__v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream);
/**
* v4l2_subdev_state_get_interval() - Get pointer to a stream frame interval
* @state: subdevice state
* @pad: pad id
* @...: stream id (optional argument)
*
* This returns a pointer to the frame interval for the given pad + stream in
* the subdev state.
*
* For stream-unaware drivers the frame interval for the corresponding pad is
* returned. If the pad does not exist, NULL is returned.
*/
#define v4l2_subdev_state_get_interval(state, pad, ...) \
__v4l2_subdev_state_constify_ret(state, \
__v4l2_subdev_state_gen_call(interval, ##__VA_ARGS__, , _pad) \
((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
#define __v4l2_subdev_state_get_interval_pad(state, pad) \
__v4l2_subdev_state_get_interval(state, pad, 0)
struct v4l2_fract *
__v4l2_subdev_state_get_interval(struct v4l2_subdev_state *state,
unsigned int pad, u32 stream);
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
/**
* v4l2_subdev_get_fmt() - Fill format based on state
* @sd: subdevice
* @state: subdevice state
* @format: pointer to &struct v4l2_subdev_format
*
* Fill @format->format field based on the information in the @format struct.
*
* This function can be used by the subdev drivers which support active state to
* implement v4l2_subdev_pad_ops.get_fmt if the subdev driver does not need to
* do anything special in their get_fmt op.
*
* Returns 0 on success, error value otherwise.
*/
int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format);
/**
* v4l2_subdev_get_frame_interval() - Fill frame interval based on state
* @sd: subdevice
* @state: subdevice state
* @fi: pointer to &struct v4l2_subdev_frame_interval
*
* Fill @fi->interval field based on the information in the @fi struct.
*
* This function can be used by the subdev drivers which support active state to
* implement v4l2_subdev_pad_ops.get_frame_interval if the subdev driver does
* not need to do anything special in their get_frame_interval op.
*
* Returns 0 on success, error value otherwise.
*/
int v4l2_subdev_get_frame_interval(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
struct v4l2_subdev_frame_interval *fi);
/**
* v4l2_subdev_set_routing() - Set given routing to subdev state
* @sd: The subdevice
* @state: The subdevice state
* @routing: Routing that will be copied to subdev state
*
* This will release old routing table (if any) from the state, allocate
* enough space for the given routing, and copy the routing.
*
* This can be used from the subdev driver's set_routing op, after validating
* the routing.
*/
int v4l2_subdev_set_routing(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
const struct v4l2_subdev_krouting *routing);
struct v4l2_subdev_route *
__v4l2_subdev_next_active_route(const struct v4l2_subdev_krouting *routing,
struct v4l2_subdev_route *route);
/**
* for_each_active_route - iterate on all active routes of a routing table
* @routing: The routing table
* @route: The route iterator
*/
#define for_each_active_route(routing, route) \
for ((route) = NULL; \
((route) = __v4l2_subdev_next_active_route((routing), (route)));)
/**
* v4l2_subdev_set_routing_with_fmt() - Set given routing and format to subdev
* state
* @sd: The subdevice
* @state: The subdevice state
* @routing: Routing that will be copied to subdev state
* @fmt: Format used to initialize all the streams
*
* This is the same as v4l2_subdev_set_routing, but additionally initializes
* all the streams using the given format.
*/
int v4l2_subdev_set_routing_with_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
const struct v4l2_subdev_krouting *routing,
const struct v4l2_mbus_framefmt *fmt);
/**
* v4l2_subdev_routing_find_opposite_end() - Find the opposite stream
* @routing: routing used to find the opposite side
* @pad: pad id
* @stream: stream id
* @other_pad: pointer used to return the opposite pad
* @other_stream: pointer used to return the opposite stream
*
* This function uses the routing table to find the pad + stream which is
* opposite the given pad + stream.
*
* @other_pad and/or @other_stream can be NULL if the caller does not need the
* value.
*
* Returns 0 on success, or -EINVAL if no matching route is found.
*/
int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,
u32 pad, u32 stream, u32 *other_pad,
u32 *other_stream);
/**
* v4l2_subdev_state_get_opposite_stream_format() - Get pointer to opposite
* stream format
* @state: subdevice state
* @pad: pad id
* @stream: stream id
*
* This returns a pointer to &struct v4l2_mbus_framefmt for the pad + stream
* that is opposite the given pad + stream in the subdev state.
*
* If the state does not contain the given pad + stream, NULL is returned.
*/
struct v4l2_mbus_framefmt *
v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
u32 pad, u32 stream);
/**
* v4l2_subdev_state_xlate_streams() - Translate streams from one pad to another
*
* @state: Subdevice state
* @pad0: The first pad
* @pad1: The second pad
* @streams: Streams bitmask on the first pad
*
* Streams on sink pads of a subdev are routed to source pads as expressed in
* the subdev state routing table. Stream numbers don't necessarily match on
* the sink and source side of a route. This function translates stream numbers
* on @pad0, expressed as a bitmask in @streams, to the corresponding streams
* on @pad1 using the routing table from the @state. It returns the stream mask
* on @pad1, and updates @streams with the streams that have been found in the
* routing table.
*
* @pad0 and @pad1 must be a sink and a source, in any order.
*
* Return: The bitmask of streams of @pad1 that are routed to @streams on @pad0.
*/
u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,
u32 pad0, u32 pad1, u64 *streams);
/**
* enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
*
* @V4L2_SUBDEV_ROUTING_NO_1_TO_N:
* an input stream shall not be routed to multiple output streams (stream
* duplication)
* @V4L2_SUBDEV_ROUTING_NO_N_TO_1:
* multiple input streams shall not be routed to the same output stream
* (stream merging)
* @V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX:
* all streams from a sink pad must be routed to a single source pad
* @V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX:
* all streams on a source pad must originate from a single sink pad
* @V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING:
* source pads shall not contain multiplexed streams
* @V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING:
* sink pads shall not contain multiplexed streams
* @V4L2_SUBDEV_ROUTING_ONLY_1_TO_1:
* only non-overlapping 1-to-1 stream routing is allowed (a combination of
* @V4L2_SUBDEV_ROUTING_NO_1_TO_N and @V4L2_SUBDEV_ROUTING_NO_N_TO_1)
* @V4L2_SUBDEV_ROUTING_NO_STREAM_MIX:
* all streams from a sink pad must be routed to a single source pad, and
* that source pad shall not get routes from any other sink pad
* (a combination of @V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX and
* @V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX)
* @V4L2_SUBDEV_ROUTING_NO_MULTIPLEXING:
* no multiplexed streams allowed on either source or sink sides.
*/
enum v4l2_subdev_routing_restriction {
V4L2_SUBDEV_ROUTING_NO_1_TO_N = BIT(0),
V4L2_SUBDEV_ROUTING_NO_N_TO_1 = BIT(1),
V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX = BIT(2),
V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX = BIT(3),
V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING = BIT(4),
V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING = BIT(5),
V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 =
V4L2_SUBDEV_ROUTING_NO_1_TO_N |
V4L2_SUBDEV_ROUTING_NO_N_TO_1,
V4L2_SUBDEV_ROUTING_NO_STREAM_MIX =
V4L2_SUBDEV_ROUTING_NO_SINK_STREAM_MIX |
V4L2_SUBDEV_ROUTING_NO_SOURCE_STREAM_MIX,
V4L2_SUBDEV_ROUTING_NO_MULTIPLEXING =
V4L2_SUBDEV_ROUTING_NO_SINK_MULTIPLEXING |
V4L2_SUBDEV_ROUTING_NO_SOURCE_MULTIPLEXING,
};
/**
* v4l2_subdev_routing_validate() - Verify that routes comply with driver
* constraints
* @sd: The subdevice
* @routing: Routing to verify
* @disallow: Restrictions on routes
*
* This verifies that the given routing complies with the @disallow constraints.
*
* Returns 0 on success, error value otherwise.
*/
int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
const struct v4l2_subdev_krouting *routing,
enum v4l2_subdev_routing_restriction disallow);
/**
* v4l2_subdev_enable_streams() - Enable streams on a pad
* @sd: The subdevice
* @pad: The pad
* @streams_mask: Bitmask of streams to enable
*
* This function enables streams on a source @pad of a subdevice. The pad is
* identified by its index, while the streams are identified by the
* @streams_mask bitmask. This allows enabling multiple streams on a pad at
* once.
*
* Enabling a stream that is already enabled isn't allowed. If @streams_mask
* contains an already enabled stream, this function returns -EALREADY without
* performing any operation.
*
* Per-stream enable is only available for subdevs that implement the
* .enable_streams() and .disable_streams() operations. For other subdevs, this
* function implements a best-effort compatibility by calling the .s_stream()
* operation, limited to subdevs that have a single source pad.
*
* Drivers that are not stream-aware shall set @streams_mask to BIT_ULL(0).
*
* Return:
* * 0: Success
* * -EALREADY: One of the streams in streams_mask is already enabled
* * -EINVAL: The pad index is invalid, or doesn't correspond to a source pad
* * -EOPNOTSUPP: Falling back to the legacy .s_stream() operation is
* impossible because the subdev has multiple source pads
*/
int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask);
/**
* v4l2_subdev_disable_streams() - Disable streams on a pad
* @sd: The subdevice
* @pad: The pad
* @streams_mask: Bitmask of streams to disable
*
* This function disables streams on a source @pad of a subdevice. The pad is
* identified by its index, while the streams are identified by the
* @streams_mask bitmask. This allows disabling multiple streams on a pad at
* once.
*
* Disabling a streams that is not enabled isn't allowed. If @streams_mask
* contains a disabled stream, this function returns -EALREADY without
* performing any operation.
*
* Per-stream disable is only available for subdevs that implement the
* .enable_streams() and .disable_streams() operations. For other subdevs, this
* function implements a best-effort compatibility by calling the .s_stream()
* operation, limited to subdevs that have a single source pad.
*
* Drivers that are not stream-aware shall set @streams_mask to BIT_ULL(0).
*
* Return:
* * 0: Success
* * -EALREADY: One of the streams in streams_mask is not enabled
* * -EINVAL: The pad index is invalid, or doesn't correspond to a source pad
* * -EOPNOTSUPP: Falling back to the legacy .s_stream() operation is
* impossible because the subdev has multiple source pads
*/
int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask);
/**
* v4l2_subdev_s_stream_helper() - Helper to implement the subdev s_stream
* operation using enable_streams and disable_streams
* @sd: The subdevice
* @enable: Enable or disable streaming
*
* Subdevice drivers that implement the streams-aware
* &v4l2_subdev_pad_ops.enable_streams and &v4l2_subdev_pad_ops.disable_streams
* operations can use this helper to implement the legacy
* &v4l2_subdev_video_ops.s_stream operation.
*
* This helper can only be used by subdevs that have a single source pad.
*
* Return: 0 on success, or a negative error code otherwise.
*/
int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable);
/**
* __v4l2_subdev_get_frame_desc_passthrough - Helper to implement the
* subdev get_frame_desc operation in simple passthrough cases
* @sd: The subdevice
* @state: The locked subdevice active state
* @pad: The source pad index
* @fd: The mbus frame desc
*
* This helper implements the get_frame_desc operation for subdevices that pass
* streams through without modification.
*
* The helper iterates over the subdevice's sink pads, calls get_frame_desc on
* the remote subdevice connected to each sink pad, and collects the frame desc
* entries for streams that are routed to the given source pad according to the
* subdevice's routing table. Each entry is copied as-is from the upstream
* source, with the exception of the 'stream' field which is remapped to the
* source stream ID from the routing table.
*
* The frame desc type is taken from the first upstream source. If multiple
* sink pads are involved and the upstream sources report different frame desc
* types, -EPIPE is returned.
*
* The caller must hold the subdevice's active state lock. This variant is
* intended for drivers that need to perform additional work around the
* passthrough frame descriptor collection. Drivers that do not need any
* customization should use v4l2_subdev_get_frame_desc_passthrough() instead.
*
* Return: 0 on success, or a negative error code otherwise.
*/
int __v4l2_subdev_get_frame_desc_passthrough(struct v4l2_subdev *sd,
struct v4l2_subdev_state *state,
unsigned int pad,
struct v4l2_mbus_frame_desc *fd);
/**
* v4l2_subdev_get_frame_desc_passthrough() - Helper to implement the subdev
* get_frame_desc operation in simple passthrough cases
* @sd: The subdevice
* @pad: The source pad index
* @fd: The mbus frame desc
*
* This function locks the subdevice's active state, calls
* __v4l2_subdev_get_frame_desc_passthrough(), and unlocks the state.
*
* This function can be assigned directly as the .get_frame_desc callback in
* &v4l2_subdev_pad_ops for subdevices that pass streams through without
* modification. Drivers that need to perform additional work should use
* __v4l2_subdev_get_frame_desc_passthrough() in their custom
* .get_frame_desc implementation instead.
*
* Return: 0 on success, or a negative error code otherwise.
*/
int v4l2_subdev_get_frame_desc_passthrough(struct v4l2_subdev *sd,
unsigned int pad,
struct v4l2_mbus_frame_desc *fd);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */
/**
* v4l2_subdev_lock_state() - Locks the subdev state
* @state: The subdevice state
*
* Locks the given subdev state.
*
* The state must be unlocked with v4l2_subdev_unlock_state() after use.
*/
static inline void v4l2_subdev_lock_state(struct v4l2_subdev_state *state)
{
mutex_lock(state->lock);
}
/**
* v4l2_subdev_unlock_state() - Unlocks the subdev state
* @state: The subdevice state
*
* Unlocks the given subdev state.
*/
static inline void v4l2_subdev_unlock_state(struct v4l2_subdev_state *state)
{
mutex_unlock(state->lock);
}
/**
* v4l2_subdev_lock_states - Lock two sub-device states
* @state1: One subdevice state
* @state2: The other subdevice state
*
* Locks the state of two sub-devices.
*
* The states must be unlocked with v4l2_subdev_unlock_states() after use.
*
* This differs from calling v4l2_subdev_lock_state() on both states so that if
* the states share the same lock, the lock is acquired only once (so no
* deadlock occurs). The caller is responsible for ensuring the locks will
* always be acquired in the same order.
*/
static inline void v4l2_subdev_lock_states(struct v4l2_subdev_state *state1,
struct v4l2_subdev_state *state2)
{
mutex_lock(state1->lock);
if (state1->lock != state2->lock)
mutex_lock(state2->lock);
}
/**
* v4l2_subdev_unlock_states() - Unlock two sub-device states
* @state1: One subdevice state
* @state2: The other subdevice state
*
* Unlocks the state of two sub-devices.
*
* This differs from calling v4l2_subdev_unlock_state() on both states so that
* if the states share the same lock, the lock is released only once.
*/
static inline void v4l2_subdev_unlock_states(struct v4l2_subdev_state *state1,
struct v4l2_subdev_state *state2)
{
mutex_unlock(state1->lock);
if (state1->lock != state2->lock)
mutex_unlock(state2->lock);
}
/**
* v4l2_subdev_get_unlocked_active_state() - Checks that the active subdev state
* is unlocked and returns it
* @sd: The subdevice
*
* Returns the active state for the subdevice, or NULL if the subdev does not
* support active state. If the state is not NULL, calls
* lockdep_assert_not_held() to issue a warning if the state is locked.
*
* This function is to be used e.g. when getting the active state for the sole
* purpose of passing it forward, without accessing the state fields.
*/
static inline struct v4l2_subdev_state *
v4l2_subdev_get_unlocked_active_state(struct v4l2_subdev *sd)
{
if (sd->active_state)
lockdep_assert_not_held(sd->active_state->lock);
return sd->active_state;
}
/**
* v4l2_subdev_get_locked_active_state() - Checks that the active subdev state
* is locked and returns it
*
* @sd: The subdevice
*
* Returns the active state for the subdevice, or NULL if the subdev does not
* support active state. If the state is not NULL, calls lockdep_assert_held()
* to issue a warning if the state is not locked.
*
* This function is to be used when the caller knows that the active state is
* already locked.
*/
static inline struct v4l2_subdev_state *
v4l2_subdev_get_locked_active_state(struct v4l2_subdev *sd)
{
if (sd->active_state)
lockdep_assert_held(sd->active_state->lock);
return sd->active_state;
}
/**
* v4l2_subdev_lock_and_get_active_state() - Locks and returns the active subdev
* state for the subdevice
* @sd: The subdevice
*
* Returns the locked active state for the subdevice, or NULL if the subdev
* does not support active state.
*
* The state must be unlocked with v4l2_subdev_unlock_state() after use.
*/
static inline struct v4l2_subdev_state *
v4l2_subdev_lock_and_get_active_state(struct v4l2_subdev *sd)
{
if (sd->active_state)
v4l2_subdev_lock_state(sd->active_state);
return sd->active_state;
}
/**
* v4l2_subdev_init - initializes the sub-device struct
*
* @sd: pointer to the &struct v4l2_subdev to be initialized
* @ops: pointer to &struct v4l2_subdev_ops.
*/
void v4l2_subdev_init(struct v4l2_subdev *sd,
const struct v4l2_subdev_ops *ops);
extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
/**
* v4l2_subdev_call - call an operation of a v4l2_subdev.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of callbacks functions.
* @f: callback function to be called.
* The callback functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args: arguments for @f.
*
* Example: err = v4l2_subdev_call(sd, video, s_std, norm);
*/
#define v4l2_subdev_call(sd, o, f, args...) \
({ \
struct v4l2_subdev *__sd = (sd); \
int __result; \
if (!__sd) \
__result = -ENODEV; \
else if (!(__sd->ops->o && __sd->ops->o->f)) \
__result = -ENOIOCTLCMD; \
else if (v4l2_subdev_call_wrappers.o && \
v4l2_subdev_call_wrappers.o->f) \
__result = v4l2_subdev_call_wrappers.o->f( \
__sd, ##args); \
else \
__result = __sd->ops->o->f(__sd, ##args); \
__result; \
})
/**
* v4l2_subdev_call_state_active - call an operation of a v4l2_subdev which
* takes state as a parameter, passing the
* subdev its active state.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of callbacks functions.
* @f: callback function to be called.
* The callback functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args: arguments for @f.
*
* This is similar to v4l2_subdev_call(), except that this version can only be
* used for ops that take a subdev state as a parameter. The macro will get the
* active state, lock it before calling the op and unlock it after the call.
*/
#define v4l2_subdev_call_state_active(sd, o, f, args...) \
({ \
int __result; \
struct v4l2_subdev_state *state; \
state = v4l2_subdev_get_unlocked_active_state(sd); \
if (state) \
v4l2_subdev_lock_state(state); \
__result = v4l2_subdev_call(sd, o, f, state, ##args); \
if (state) \
v4l2_subdev_unlock_state(state); \
__result; \
})
/**
* v4l2_subdev_call_state_try - call an operation of a v4l2_subdev which
* takes state as a parameter, passing the
* subdev a newly allocated try state.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of callbacks functions.
* @f: callback function to be called.
* The callback functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args: arguments for @f.
*
* This is similar to v4l2_subdev_call_state_active(), except that as this
* version allocates a new state, this is only usable for
* V4L2_SUBDEV_FORMAT_TRY use cases.
*
* Note: only legacy non-MC drivers may need this macro.
*/
#define v4l2_subdev_call_state_try(sd, o, f, args...) \
({ \
int __result; \
static struct lock_class_key __key; \
const char *name = KBUILD_BASENAME \
":" __stringify(__LINE__) ":state->lock"; \
struct v4l2_subdev_state *state = \
__v4l2_subdev_state_alloc(sd, name, &__key); \
if (IS_ERR(state)) { \
__result = PTR_ERR(state); \
} else { \
v4l2_subdev_lock_state(state); \
__result = v4l2_subdev_call(sd, o, f, state, ##args); \
v4l2_subdev_unlock_state(state); \
__v4l2_subdev_state_free(state); \
} \
__result; \
})
/**
* v4l2_subdev_has_op - Checks if a subdev defines a certain operation.
*
* @sd: pointer to the &struct v4l2_subdev
* @o: The group of callback functions in &struct v4l2_subdev_ops
* which @f is a part of.
* @f: callback function to be checked for its existence.
*/
#define v4l2_subdev_has_op(sd, o, f) \
((sd)->ops->o && (sd)->ops->o->f)
/**
* v4l2_subdev_notify_event() - Delivers event notification for subdevice
* @sd: The subdev for which to deliver the event
* @ev: The event to deliver
*
* Will deliver the specified event to all userspace event listeners which are
* subscribed to the v42l subdev event queue as well as to the bridge driver
* using the notify callback. The notification type for the notify callback
* will be %V4L2_DEVICE_NOTIFY_EVENT.
*/
void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
const struct v4l2_event *ev);
/**
* v4l2_subdev_is_streaming() - Returns if the subdevice is streaming
* @sd: The subdevice
*
* v4l2_subdev_is_streaming() tells if the subdevice is currently streaming.
* "Streaming" here means whether .s_stream() or .enable_streams() has been
* successfully called, and the streaming has not yet been disabled.
*
* If the subdevice implements .enable_streams() this function must be called
* while holding the active state lock.
*/
bool v4l2_subdev_is_streaming(struct v4l2_subdev *sd);
#endif /* _V4L2_SUBDEV_H */
