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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.
*
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