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[media] v4l2-mc: add a generic function to create the media graph
The em28xx_v4l2_create_media_graph() is almost generic enough to be at the core, as an ancillary function. Make it even more generic, by getting rid of em28xx-specific code, relying only at the media_device, in order to discover all entities found on PC-customer's hardware and add it at the V4L2 core. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
85e91f80cf
commit
54d0dbac12
@ -16,6 +16,7 @@ endif
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ifeq ($(CONFIG_TRACEPOINTS),y)
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videodev-objs += vb2-trace.o v4l2-trace.o
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endif
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videodev-$(CONFIG_MEDIA_CONTROLLER) += v4l2-mc.o
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obj-$(CONFIG_VIDEO_V4L2) += videodev.o
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obj-$(CONFIG_VIDEO_V4L2) += v4l2-common.o
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186
drivers/media/v4l2-core/v4l2-mc.c
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186
drivers/media/v4l2-core/v4l2-mc.c
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@ -0,0 +1,186 @@
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/*
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* Media Controller ancillary functions
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*
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* (c) 2016 Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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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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#include <linux/module.h>
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#include <media/media-entity.h>
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#include <media/v4l2-mc.h>
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int v4l2_mc_create_media_graph(struct media_device *mdev)
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{
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struct media_entity *entity;
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struct media_entity *if_vid = NULL, *if_aud = NULL, *sensor = NULL;
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struct media_entity *tuner = NULL, *decoder = NULL;
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struct media_entity *io_v4l = NULL, *io_vbi = NULL, *io_swradio = NULL;
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bool is_webcam = false;
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u32 flags;
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int ret;
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if (!mdev)
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return 0;
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media_device_for_each_entity(entity, mdev) {
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switch (entity->function) {
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case MEDIA_ENT_F_IF_VID_DECODER:
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if_vid = entity;
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break;
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case MEDIA_ENT_F_IF_AUD_DECODER:
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if_aud = entity;
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break;
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case MEDIA_ENT_F_TUNER:
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tuner = entity;
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break;
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case MEDIA_ENT_F_ATV_DECODER:
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decoder = entity;
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break;
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case MEDIA_ENT_F_IO_V4L:
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io_v4l = entity;
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break;
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case MEDIA_ENT_F_IO_VBI:
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io_vbi = entity;
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break;
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case MEDIA_ENT_F_IO_SWRADIO:
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io_swradio = entity;
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break;
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case MEDIA_ENT_F_CAM_SENSOR:
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sensor = entity;
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is_webcam = true;
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break;
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}
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}
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/* It should have at least one I/O entity */
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if (!io_v4l && !io_vbi && !io_swradio)
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return -EINVAL;
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/*
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* Here, 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 not enough
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* for mc-centric hardware, it is enough for v4l2 interface centric
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* PC-consumer's hardware.
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*/
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if (is_webcam) {
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if (!io_v4l)
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return -EINVAL;
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media_device_for_each_entity(entity, mdev) {
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if (entity->function != MEDIA_ENT_F_CAM_SENSOR)
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continue;
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ret = media_create_pad_link(entity, 0,
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io_v4l, 0,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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}
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if (!decoder)
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return 0;
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}
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/* The device isn't a webcam. So, it should have a decoder */
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if (!decoder)
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return -EINVAL;
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/* Link the tuner and IF video output pads */
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if (tuner) {
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if (if_vid) {
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ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT,
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if_vid,
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IF_VID_DEC_PAD_IF_INPUT,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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ret = media_create_pad_link(if_vid, IF_VID_DEC_PAD_OUT,
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decoder, DEMOD_PAD_IF_INPUT,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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} else {
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ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT,
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decoder, DEMOD_PAD_IF_INPUT,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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}
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if (if_aud) {
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ret = media_create_pad_link(tuner, TUNER_PAD_AUD_OUT,
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if_aud,
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IF_AUD_DEC_PAD_IF_INPUT,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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} else {
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if_aud = tuner;
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}
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}
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/* Create demod to V4L, VBI and SDR radio links */
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if (io_v4l) {
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ret = media_create_pad_link(decoder, DEMOD_PAD_VID_OUT,
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io_v4l, 0,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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}
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if (io_swradio) {
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ret = media_create_pad_link(decoder, DEMOD_PAD_VID_OUT,
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io_swradio, 0,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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}
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if (io_vbi) {
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ret = media_create_pad_link(decoder, DEMOD_PAD_VBI_OUT,
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io_vbi, 0,
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MEDIA_LNK_FL_ENABLED);
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if (ret)
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return ret;
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}
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/* Create links for the media connectors */
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flags = MEDIA_LNK_FL_ENABLED;
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media_device_for_each_entity(entity, mdev) {
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switch (entity->function) {
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case MEDIA_ENT_F_CONN_RF:
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if (!tuner)
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continue;
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ret = media_create_pad_link(entity, 0, tuner,
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TUNER_PAD_RF_INPUT,
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flags);
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break;
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case MEDIA_ENT_F_CONN_SVIDEO:
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case MEDIA_ENT_F_CONN_COMPOSITE:
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case MEDIA_ENT_F_CONN_TEST:
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ret = media_create_pad_link(entity, 0, decoder,
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DEMOD_PAD_IF_INPUT,
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flags);
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break;
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default:
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continue;
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}
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if (ret)
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return ret;
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flags = 0;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph);
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@ -14,6 +14,8 @@
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* GNU General Public License for more details.
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*/
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#include <media/media-device.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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@ -89,3 +91,26 @@ enum demod_pad_index {
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DEMOD_PAD_VBI_OUT,
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DEMOD_NUM_PADS
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};
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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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* NOTE: 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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#ifdef CONFIG_MEDIA_CONTROLLER
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int v4l2_mc_create_media_graph(struct media_device *mdev);
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#else
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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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#endif
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