include/media/v4l2-mc.h

   1 /*
   2  * v4l2-mc.h - Media Controller V4L2 types and prototypes
   3  *
   4  * Copyright (C) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
   5  * Copyright (C) 2006-2010 Nokia Corporation
   6  * Copyright (c) 2016 Intel Corporation.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #ifndef _V4L2_MC_H
  20 #define _V4L2_MC_H
  21
  22 #include <media/media-device.h>
  23 #include <media/v4l2-dev.h>
  24 #include <linux/types.h>
  25
  26 /**
  27  * enum tuner_pad_index - tuner pad index for MEDIA_ENT_F_TUNER
  28  *
  29  * @TUNER_PAD_RF_INPUT: Radiofrequency (RF) sink pad, usually linked to a
  30  *                      RF connector entity.
  31  * @TUNER_PAD_OUTPUT:   Tuner video output source pad. Contains the video
  32  *                      chrominance and luminance or the hole bandwidth
  33  *                      of the signal converted to an Intermediate Frequency
  34  *                      (IF) or to baseband (on zero-IF tuners).
  35  * @TUNER_PAD_AUD_OUT:  Tuner audio output source pad. Tuners used to decode
  36  *                      analog TV signals have an extra pad for audio output.
  37  *                      Old tuners use an analog stage with a saw filter for
  38  *                      the audio IF frequency. The output of the pad is, in
  39  *                      this case, the audio IF, with should be decoded either
  40  *                      by the bridge chipset (that's the case of cx2388x
  41  *                      chipsets) or may require an external IF sound
  42  *                      processor, like msp34xx. On modern silicon tuners,
  43  *                      the audio IF decoder is usually incorporated at the
  44  *                      tuner. On such case, the output of this pad is an
  45  *                      audio sampled data.
  46  * @TUNER_NUM_PADS:     Number of pads of the tuner.
  47  */
  48 enum tuner_pad_index {
  49         TUNER_PAD_RF_INPUT,
  50         TUNER_PAD_OUTPUT,
  51         TUNER_PAD_AUD_OUT,
  52         TUNER_NUM_PADS
  53 };
  54
  55 /**
  56  * enum if_vid_dec_index - video IF-PLL pad index for
  57  *                         MEDIA_ENT_F_IF_VID_DECODER
  58  *
  59  * @IF_VID_DEC_PAD_IF_INPUT:    video Intermediate Frequency (IF) sink pad
  60  * @IF_VID_DEC_PAD_OUT:         IF-PLL video output source pad. Contains the
  61  *                              video chrominance and luminance IF signals.
  62  * @IF_VID_DEC_PAD_NUM_PADS:    Number of pads of the video IF-PLL.
  63  */
  64 enum if_vid_dec_pad_index {
  65         IF_VID_DEC_PAD_IF_INPUT,
  66         IF_VID_DEC_PAD_OUT,
  67         IF_VID_DEC_PAD_NUM_PADS
  68 };
  69
  70 /**
  71  * enum if_aud_dec_index - audio/sound IF-PLL pad index for
  72  *                         MEDIA_ENT_F_IF_AUD_DECODER
  73  *
  74  * @IF_AUD_DEC_PAD_IF_INPUT:    audio Intermediate Frequency (IF) sink pad
  75  * @IF_AUD_DEC_PAD_OUT:         IF-PLL audio output source pad. Contains the
  76  *                              audio sampled stream data, usually connected
  77  *                              to the bridge bus via an Inter-IC Sound (I2S)
  78  *                              bus.
  79  * @IF_AUD_DEC_PAD_NUM_PADS:    Number of pads of the audio IF-PLL.
  80  */
  81 enum if_aud_dec_pad_index {
  82         IF_AUD_DEC_PAD_IF_INPUT,
  83         IF_AUD_DEC_PAD_OUT,
  84         IF_AUD_DEC_PAD_NUM_PADS
  85 };
  86
  87 /**
  88  * enum demod_pad_index - analog TV pad index for MEDIA_ENT_F_ATV_DECODER
  89  *
  90  * @DEMOD_PAD_IF_INPUT: IF input sink pad.
  91  * @DEMOD_PAD_VID_OUT:  Video output source pad.
  92  * @DEMOD_PAD_VBI_OUT:  Vertical Blank Interface (VBI) output source pad.
  93  * @DEMOD_PAD_AUDIO_OUT: Audio output source pad.
  94  * @DEMOD_NUM_PADS:     Maximum number of output pads.
  95  */
  96 enum demod_pad_index {
  97         DEMOD_PAD_IF_INPUT,
  98         DEMOD_PAD_VID_OUT,
  99         DEMOD_PAD_VBI_OUT,
 100         DEMOD_PAD_AUDIO_OUT,
 101         DEMOD_NUM_PADS
 102 };
 103
 104 /* We don't need to include pci.h or usb.h here */
 105 struct pci_dev;
 106 struct usb_device;
 107
 108 #ifdef CONFIG_MEDIA_CONTROLLER
 109 /**
 110  * v4l2_mc_create_media_graph() - create Media Controller links at the graph.
 111  *
 112  * @mdev:       pointer to the &media_device struct.
 113  *
 114  * Add links between the entities commonly found on PC customer's hardware at
 115  * the V4L2 side: camera sensors, audio and video PLL-IF decoders, tuners,
 116  * analog TV decoder and I/O entities (video, VBI and Software Defined Radio).
 117  *
 118  * .. note::
 119  *
 120  *    Webcams are modelled on a very simple way: the sensor is
 121  *    connected directly to the I/O entity. All dirty details, like
 122  *    scaler and crop HW are hidden. While such mapping is enough for v4l2
 123  *    interface centric PC-consumer's hardware, V4L2 subdev centric camera
 124  *    hardware should not use this routine, as it will not build the right graph.
 125  */
 126 int v4l2_mc_create_media_graph(struct media_device *mdev);
 127
 128 /**
 129  * v4l_enable_media_source() -  Hold media source for exclusive use
 130  *                              if free
 131  *
 132  * @vdev:       pointer to struct video_device
 133  *
 134  * This interface calls enable_source handler to determine if
 135  * media source is free for use. The enable_source handler is
 136  * responsible for checking is the media source is free and
 137  * start a pipeline between the media source and the media
 138  * entity associated with the video device. This interface
 139  * should be called from v4l2-core and dvb-core interfaces
 140  * that change the source configuration.
 141  *
 142  * Return: returns zero on success or a negative error code.
 143  */
 144 int v4l_enable_media_source(struct video_device *vdev);
 145
 146 /**
 147  * v4l_disable_media_source() - Release media source
 148  *
 149  * @vdev:       pointer to struct video_device
 150  *
 151  * This interface calls disable_source handler to release
 152  * the media source. The disable_source handler stops the
 153  * active media pipeline between the media source and the
 154  * media entity associated with the video device.
 155  *
 156  * Return: returns zero on success or a negative error code.
 157  */
 158 void v4l_disable_media_source(struct video_device *vdev);
 159
 160 /*
 161  * v4l_vb2q_enable_media_tuner -  Hold media source for exclusive use
 162  *                                if free.
 163  * @q - pointer to struct vb2_queue
 164  *
 165  * Wrapper for v4l_enable_media_source(). This function should
 166  * be called from v4l2-core to enable the media source with
 167  * pointer to struct vb2_queue as the input argument. Some
 168  * v4l2-core interfaces don't have access to video device and
 169  * this interface finds the struct video_device for the q and
 170  * calls v4l_enable_media_source().
 171  */
 172 int v4l_vb2q_enable_media_source(struct vb2_queue *q);
 173
 174
 175 /**
 176  * v4l2_pipeline_pm_use - Update the use count of an entity
 177  * @entity: The entity
 178  * @use: Use (1) or stop using (0) the entity
 179  *
 180  * Update the use count of all entities in the pipeline and power entities on or
 181  * off accordingly.
 182  *
 183  * This function is intended to be called in video node open (use ==
 184  * 1) and release (use == 0). It uses struct media_entity.use_count to
 185  * track the power status. The use of this function should be paired
 186  * with v4l2_pipeline_link_notify().
 187  *
 188  * Return 0 on success or a negative error code on failure. Powering entities
 189  * off is assumed to never fail. No failure can occur when the use parameter is
 190  * set to 0.
 191  */
 192 int v4l2_pipeline_pm_use(struct media_entity *entity, int use);
 193
 194
 195 /**
 196  * v4l2_pipeline_link_notify - Link management notification callback
 197  * @link: The link
 198  * @flags: New link flags that will be applied
 199  * @notification: The link's state change notification type (MEDIA_DEV_NOTIFY_*)
 200  *
 201  * React to link management on powered pipelines by updating the use count of
 202  * all entities in the source and sink sides of the link. Entities are powered
 203  * on or off accordingly. The use of this function should be paired
 204  * with v4l2_pipeline_pm_use().
 205  *
 206  * Return 0 on success or a negative error code on failure. Powering entities
 207  * off is assumed to never fail. This function will not fail for disconnection
 208  * events.
 209  */
 210 int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
 211                               unsigned int notification);
 212
 213 #else /* CONFIG_MEDIA_CONTROLLER */
 214
 215 static inline int v4l2_mc_create_media_graph(struct media_device *mdev)
 216 {
 217         return 0;
 218 }
 219
 220 static inline int v4l_enable_media_source(struct video_device *vdev)
 221 {
 222         return 0;
 223 }
 224
 225 static inline void v4l_disable_media_source(struct video_device *vdev)
 226 {
 227 }
 228
 229 static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
 230 {
 231         return 0;
 232 }
 233
 234 static inline int v4l2_pipeline_pm_use(struct media_entity *entity, int use)
 235 {
 236         return 0;
 237 }
 238
 239 static inline int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
 240                                             unsigned int notification)
 241 {
 242         return 0;
 243 }
 244
 245 #endif /* CONFIG_MEDIA_CONTROLLER */
 246 #endif /* _V4L2_MC_H */