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linux/include/media/v4l2-subdev.h
Kieran Bingham 47f910f0e0 [media] v4l: subdev: tolerate null in media_entity_to_v4l2_subdev 
Return NULL, if a null entity is parsed for it's v4l2_subdev

Currently, the callers of media_entity_to_v4l2_subdev() need to
make sure that the subdev is non-NULL, for example, when it is
obtained from media_entity_remote_pad().

As this is a recurring pattern, add the check at the macro in order
to avoid additional checks at the callers.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-06-08 16:55:25 -03:00

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/*
* V4L2 sub-device support header.
*
* Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#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 tuner_setup;
struct v4l2_mbus_frame_desc;
/**
* 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 busses
* 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.
*/
/* Subdevice external IO pin configuration */
#define V4L2_SUBDEV_IO_PIN_DISABLE (1 << 0) /* ENABLE assumed */
#define V4L2_SUBDEV_IO_PIN_OUTPUT (1 << 1)
#define V4L2_SUBDEV_IO_PIN_INPUT (1 << 2)
#define V4L2_SUBDEV_IO_PIN_SET_VALUE (1 << 3) /* Set output value */
#define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW (1 << 4) /* ACTIVE HIGH assumed */
/**
* struct v4l2_subdev_io_pin_config - Subdevice external IO pin configuration
*
* @flags: bitmask with flags for this pin's config:
* %V4L2_SUBDEV_IO_PIN_DISABLE - disables a pin config,
* %V4L2_SUBDEV_IO_PIN_OUTPUT - if pin is an output,
* %V4L2_SUBDEV_IO_PIN_INPUT - if pin is an input,
* %V4L2_SUBDEV_IO_PIN_SET_VALUE - to set the output value via @value
* and %V4L2_SUBDEV_IO_PIN_ACTIVE_LOW - if active is 0.
* @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.
*
* @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_G_REGISTER ioctl handler code.
*
* @s_register: callback for %VIDIOC_G_REGISTER ioctl handler code.
*
* @s_power: puts subdevice in power saving mode (on == 0) or normal operation
* mode (on == 1).
*
* @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 (*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.
*
* @s_radio: callback for %VIDIOC_S_RADIO ioctl handler code.
*
* @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
*/
struct v4l2_subdev_tuner_ops {
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);
};
/* Indicates the @length field specifies maximum data length. */
#define V4L2_MBUS_FRAME_DESC_FL_LEN_MAX (1U << 0)
/*
* Indicates that the format does not have line offsets, i.e. the
* receiver should use 1D DMA.
*/
#define V4L2_MBUS_FRAME_DESC_FL_BLOB (1U << 1)
/**
* struct v4l2_mbus_frame_desc_entry - media bus frame description structure
*
* @flags: bitmask flags: %V4L2_MBUS_FRAME_DESC_FL_LEN_MAX and
* %V4L2_MBUS_FRAME_DESC_FL_BLOB.
* @pixelcode: media bus pixel code, valid if FRAME_DESC_FL_BLOB is not set
* @length: number of octets per frame, valid if V4L2_MBUS_FRAME_DESC_FL_BLOB
* is set
*/
struct v4l2_mbus_frame_desc_entry {
u16 flags;
u32 pixelcode;
u32 length;
};
#define V4L2_FRAME_DESC_ENTRY_MAX 4
/**
* struct v4l2_mbus_frame_desc - media bus data frame description
* @entry: frame descriptors array
* @num_entries: number of entries in @entry array
*/
struct v4l2_mbus_frame_desc {
struct v4l2_mbus_frame_desc_entry entry[V4L2_FRAME_DESC_ENTRY_MAX];
unsigned short num_entries;
};
/**
* 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: used to notify the driver that a video stream will start or has
* stopped.
*
* @g_pixelaspect: callback to return the pixelaspect ratio.
*
* @g_parm: callback for %VIDIOC_G_PARM ioctl handler code.
*
* @s_parm: callback for %VIDIOC_S_PARM ioctl handler code.
*
* @g_frame_interval: callback for %VIDIOC_G_FRAMEINTERVAL ioctl handler code.
*
* @s_frame_interval: callback for %VIDIOC_S_FRAMEINTERVAL 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.
*
* @g_mbus_config: get supported mediabus configurations
*
* @s_mbus_config: set a certain mediabus configuration. This operation is added
* for compatibility with soc-camera drivers and should not be used by new
* software.
*
* @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.
*/
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 (*g_pixelaspect)(struct v4l2_subdev *sd, struct v4l2_fract *aspect);
int (*g_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
int (*s_parm)(struct v4l2_subdev *sd, struct v4l2_streamparm *param);
int (*g_frame_interval)(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *interval);
int (*s_frame_interval)(struct v4l2_subdev *sd,
struct v4l2_subdev_frame_interval *interval);
int (*s_dv_timings)(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings);
int (*g_dv_timings)(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings);
int (*query_dv_timings)(struct v4l2_subdev *sd,
struct v4l2_dv_timings *timings);
int (*g_mbus_config)(struct v4l2_subdev *sd,
struct v4l2_mbus_config *cfg);
int (*s_mbus_config)(struct v4l2_subdev *sd,
const struct v4l2_mbus_config *cfg);
int (*s_rx_buffer)(struct v4l2_subdev *sd, void *buf,
unsigned int *size);
};
/**
* 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_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
* the IR receiver.
* @rx_s_parameters: Set the current operating parameters and state of the
* 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
* the IR transmitter.
* @tx_s_parameters: Set the current operating parameters and state of the
* 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.
*
* @try_fmt: &struct v4l2_mbus_framefmt
* @try_crop: &struct v4l2_rect to be used for crop
* @try_compose: &struct v4l2_rect to be used for compose
*
* 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_pad_config {
struct v4l2_mbus_framefmt try_fmt;
struct v4l2_rect try_crop;
struct v4l2_rect try_compose;
};
/**
* struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations
*
* @init_cfg: initialize the pad config to default values
* @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_edid: callback for %VIDIOC_SUBDEV_G_EDID ioctl handler code.
*
* @set_edid: callback for %VIDIOC_SUBDEV_S_EDID 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.
*/
struct v4l2_subdev_pad_ops {
int (*init_cfg)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg);
int (*enum_mbus_code)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code);
int (*enum_frame_size)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_size_enum *fse);
int (*enum_frame_interval)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_frame_interval_enum *fie);
int (*get_fmt)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format);
int (*set_fmt)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format);
int (*get_selection)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_selection *sel);
int (*set_selection)(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_selection *sel);
int (*get_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
int (*set_edid)(struct v4l2_subdev *sd, struct v4l2_edid *edid);
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);
};
/**
* 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
*
* @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.
*
* .. note::
* Never call this from drivers, only the v4l2 framework can call
* these ops.
*/
struct v4l2_subdev_internal_ops {
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);
};
#define V4L2_SUBDEV_NAME_SIZE 32
/* 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. */
#define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
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
* ownner. 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.
* @asd: Pointer to respective &struct v4l2_async_subdev.
* @notifier: Pointer to the managing notifier.
* @pdata: common part of subdevice platform data
*
* 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[V4L2_SUBDEV_NAME_SIZE];
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 v4l2_async_subdev *asd;
struct v4l2_async_notifier *notifier;
struct v4l2_subdev_platform_data *pdata;
};
#define media_entity_to_v4l2_subdev(ent) \
({ \
typeof(ent) __me_sd_ent = (ent); \
\
__me_sd_ent ? \
container_of(__me_sd_ent, struct v4l2_subdev, entity) : \
NULL; \
})
#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
* @pad: pointer to v4l2_subdev_pad_config
*/
struct v4l2_subdev_fh {
struct v4l2_fh vfh;
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
struct v4l2_subdev_pad_config *pad;
#endif
};
#define to_v4l2_subdev_fh(fh) \
container_of(fh, struct v4l2_subdev_fh, vfh)
#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
#define __V4L2_SUBDEV_MK_GET_TRY(rtype, fun_name, field_name) \
static inline struct rtype * \
fun_name(struct v4l2_subdev *sd, \
struct v4l2_subdev_pad_config *cfg, \
unsigned int pad) \
{ \
BUG_ON(pad >= sd->entity.num_pads); \
return &cfg[pad].field_name; \
}
__V4L2_SUBDEV_MK_GET_TRY(v4l2_mbus_framefmt, v4l2_subdev_get_try_format, try_fmt)
__V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_crop, try_crop)
__V4L2_SUBDEV_MK_GET_TRY(v4l2_rect, v4l2_subdev_get_try_compose, try_compose)
#endif
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_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.
*/
int v4l2_subdev_link_validate(struct media_link *link);
/**
* v4l2_subdev_alloc_pad_config - Allocates memory for pad config
*
* @sd: pointer to struct v4l2_subdev
*/
struct
v4l2_subdev_pad_config *v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd);
/**
* v4l2_subdev_free_pad_config - Frees memory allocated by
* v4l2_subdev_alloc_pad_config().
*
* @cfg: pointer to &struct v4l2_subdev_pad_config
*/
void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg);
#endif /* CONFIG_MEDIA_CONTROLLER */
/**
* 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);
/*
* Call an ops of a v4l2_subdev, doing the right checks against
* NULL pointers.
*
* Example: err = v4l2_subdev_call(sd, video, s_std, norm);
*/
#define v4l2_subdev_call(sd, o, f, args...) \
(!(sd) ? -ENODEV : (((sd)->ops->o && (sd)->ops->o->f) ? \
(sd)->ops->o->f((sd), ##args) : -ENOIOCTLCMD))
#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);
#endif
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