247 lines
8 KiB
C
Executable file
247 lines
8 KiB
C
Executable file
/*
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* v4l2-mc.h - Media Controller V4L2 types and prototypes
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*
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* Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
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* Copyright (C) 2006-2010 Nokia Corporation
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* Copyright (c) 2016 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _V4L2_MC_H
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#define _V4L2_MC_H
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#include <media/media-device.h>
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#include <media/v4l2-dev.h>
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#include <linux/types.h>
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/**
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* enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER
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*
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* @TUNER_PAD_RF_INPUT: Radiofrequency (RF) sink pad, usually linked to a
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* RF connector entity.
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* @TUNER_PAD_OUTPUT: Tuner video output source pad. Contains the video
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* chrominance and luminance or the hole bandwidth
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* of the signal converted to an Intermediate Frequency
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* (IF) or to baseband (on zero-IF tuners).
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* @TUNER_PAD_AUD_OUT: Tuner audio output source pad. Tuners used to decode
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* analog TV signals have an extra pad for audio output.
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* Old tuners use an analog stage with a saw filter for
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* the audio IF frequency. The output of the pad is, in
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* this case, the audio IF, with should be decoded either
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* by the bridge chipset (that's the case of cx2388x
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* chipsets) or may require an external IF sound
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* processor, like msp34xx. On modern silicon tuners,
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* the audio IF decoder is usually incorporated at the
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* tuner. On such case, the output of this pad is an
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* audio sampled data.
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* @TUNER_NUM_PADS: Number of pads of the tuner.
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*/
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enum tuner_pad_index {
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TUNER_PAD_RF_INPUT,
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TUNER_PAD_OUTPUT,
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TUNER_PAD_AUD_OUT,
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TUNER_NUM_PADS
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};
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/**
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* enum if_vid_dec_pad_index - video IF-PLL pad index for
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* MEDIA_ENT_F_IF_VID_DECODER
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*
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* @IF_VID_DEC_PAD_IF_INPUT: video Intermediate Frequency (IF) sink pad
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* @IF_VID_DEC_PAD_OUT: IF-PLL video output source pad. Contains the
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* video chrominance and luminance IF signals.
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* @IF_VID_DEC_PAD_NUM_PADS: Number of pads of the video IF-PLL.
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*/
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enum if_vid_dec_pad_index {
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IF_VID_DEC_PAD_IF_INPUT,
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IF_VID_DEC_PAD_OUT,
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IF_VID_DEC_PAD_NUM_PADS
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};
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/**
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* enum if_aud_dec_pad_index - audio/sound IF-PLL pad index for
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* MEDIA_ENT_F_IF_AUD_DECODER
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*
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* @IF_AUD_DEC_PAD_IF_INPUT: audio Intermediate Frequency (IF) sink pad
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* @IF_AUD_DEC_PAD_OUT: IF-PLL audio output source pad. Contains the
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* audio sampled stream data, usually connected
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* to the bridge bus via an Inter-IC Sound (I2S)
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* bus.
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* @IF_AUD_DEC_PAD_NUM_PADS: Number of pads of the audio IF-PLL.
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*/
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enum if_aud_dec_pad_index {
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IF_AUD_DEC_PAD_IF_INPUT,
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IF_AUD_DEC_PAD_OUT,
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IF_AUD_DEC_PAD_NUM_PADS
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};
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/**
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* enum demod_pad_index - analog TV pad index for MEDIA_ENT_F_ATV_DECODER
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*
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* @DEMOD_PAD_IF_INPUT: IF input sink pad.
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* @DEMOD_PAD_VID_OUT: Video output source pad.
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* @DEMOD_PAD_VBI_OUT: Vertical Blank Interface (VBI) output source pad.
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* @DEMOD_PAD_AUDIO_OUT: Audio output source pad.
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* @DEMOD_NUM_PADS: Maximum number of output pads.
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*/
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enum demod_pad_index {
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DEMOD_PAD_IF_INPUT,
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DEMOD_PAD_VID_OUT,
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DEMOD_PAD_VBI_OUT,
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DEMOD_PAD_AUDIO_OUT,
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DEMOD_NUM_PADS
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};
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/* We don't need to include pci.h or usb.h here */
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struct pci_dev;
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struct usb_device;
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#ifdef CONFIG_MEDIA_CONTROLLER
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/**
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* v4l2_mc_create_media_graph() - create Media Controller links at the graph.
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*
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* @mdev: pointer to the &media_device struct.
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*
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* Add links between the entities commonly found on PC customer's hardware at
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* the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
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* analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
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*
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* .. note::
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*
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* Webcams are modelled on a very simple way: the sensor is
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* connected directly to the I/O entity. All dirty details, like
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* scaler and crop HW are hidden. While such mapping is enough for v4l2
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* interface centric PC-consumer's hardware, V4L2 subdev centric camera
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* hardware should not use this routine, as it will not build the right graph.
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*/
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int v4l2_mc_create_media_graph(struct media_device *mdev);
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/**
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* v4l_enable_media_source() - Hold media source for exclusive use
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* if free
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*
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* @vdev: pointer to struct video_device
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*
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* This interface calls enable_source handler to determine if
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* media source is free for use. The enable_source handler is
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* responsible for checking is the media source is free and
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* start a pipeline between the media source and the media
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* entity associated with the video device. This interface
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* should be called from v4l2-core and dvb-core interfaces
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* that change the source configuration.
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*
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* Return: returns zero on success or a negative error code.
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*/
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int v4l_enable_media_source(struct video_device *vdev);
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/**
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* v4l_disable_media_source() - Release media source
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*
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* @vdev: pointer to struct video_device
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*
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* This interface calls disable_source handler to release
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* the media source. The disable_source handler stops the
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* active media pipeline between the media source and the
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* media entity associated with the video device.
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*
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* Return: returns zero on success or a negative error code.
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*/
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void v4l_disable_media_source(struct video_device *vdev);
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/*
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* v4l_vb2q_enable_media_tuner - Hold media source for exclusive use
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* if free.
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* @q - pointer to struct vb2_queue
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*
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* Wrapper for v4l_enable_media_source(). This function should
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* be called from v4l2-core to enable the media source with
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* pointer to struct vb2_queue as the input argument. Some
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* v4l2-core interfaces don't have access to video device and
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* this interface finds the struct video_device for the q and
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* calls v4l_enable_media_source().
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*/
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int v4l_vb2q_enable_media_source(struct vb2_queue *q);
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/**
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* v4l2_pipeline_pm_use - Update the use count of an entity
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* @entity: The entity
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* @use: Use (1) or stop using (0) the entity
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*
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* Update the use count of all entities in the pipeline and power entities on or
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* off accordingly.
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*
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* This function is intended to be called in video node open (use ==
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* 1) and release (use == 0). It uses struct media_entity.use_count to
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* track the power status. The use of this function should be paired
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* with v4l2_pipeline_link_notify().
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*
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* Return 0 on success or a negative error code on failure. Powering entities
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* off is assumed to never fail. No failure can occur when the use parameter is
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* set to 0.
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*/
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int v4l2_pipeline_pm_use(struct media_entity *entity, int use);
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/**
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* v4l2_pipeline_link_notify - Link management notification callback
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* @link: The link
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* @flags: New link flags that will be applied
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* @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
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*
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* React to link management on powered pipelines by updating the use count of
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* all entities in the source and sink sides of the link. Entities are powered
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* on or off accordingly. The use of this function should be paired
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* with v4l2_pipeline_pm_use().
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*
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* Return 0 on success or a negative error code on failure. Powering entities
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* off is assumed to never fail. This function will not fail for disconnection
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* events.
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*/
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int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
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unsigned int notification);
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#else /* CONFIG_MEDIA_CONTROLLER */
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static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
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{
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return 0;
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}
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static inline int v4l_enable_media_source(struct video_device *vdev)
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{
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return 0;
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}
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static inline void v4l_disable_media_source(struct video_device *vdev)
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{
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}
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static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
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{
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return 0;
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}
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static inline int v4l2_pipeline_pm_use(struct media_entity *entity, int use)
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{
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return 0;
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}
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static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
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unsigned int notification)
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{
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return 0;
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}
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#endif /* CONFIG_MEDIA_CONTROLLER */
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#endif /* _V4L2_MC_H */
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