404 lines
10 KiB
C
404 lines
10 KiB
C
/*
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* Media Controller ancillary functions
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*
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* Copyright (c) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
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* Copyright (C) 2016 Shuah Khan <shuahkh@osg.samsung.com>
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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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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/usb.h>
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#include <media/media-device.h>
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#include <media/media-entity.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-mc.h>
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#include <media/v4l2-subdev.h>
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#include <media/media-device.h>
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#include <media/v4l2-mc.h>
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#include <media/videobuf2-core.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;
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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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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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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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int v4l_enable_media_source(struct video_device *vdev)
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{
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struct media_device *mdev = vdev->entity.graph_obj.mdev;
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int ret;
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if (!mdev || !mdev->enable_source)
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return 0;
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ret = mdev->enable_source(&vdev->entity, &vdev->pipe);
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if (ret)
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return -EBUSY;
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l_enable_media_source);
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void v4l_disable_media_source(struct video_device *vdev)
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{
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struct media_device *mdev = vdev->entity.graph_obj.mdev;
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if (mdev && mdev->disable_source)
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mdev->disable_source(&vdev->entity);
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}
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EXPORT_SYMBOL_GPL(v4l_disable_media_source);
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int v4l_vb2q_enable_media_source(struct vb2_queue *q)
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{
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struct v4l2_fh *fh = q->owner;
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if (fh && fh->vdev)
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return v4l_enable_media_source(fh->vdev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source);
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/* -----------------------------------------------------------------------------
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* Pipeline power management
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*
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* Entities must be powered up when part of a pipeline that contains at least
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* one open video device node.
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*
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* To achieve this use the entity use_count field to track the number of users.
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* For entities corresponding to video device nodes the use_count field stores
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* the users count of the node. For entities corresponding to subdevs the
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* use_count field stores the total number of users of all video device nodes
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* in the pipeline.
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*
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* The v4l2_pipeline_pm_use() function must be called in the open() and
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* close() handlers of video device nodes. It increments or decrements the use
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* count of all subdev entities in the pipeline.
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*
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* To react to link management on powered pipelines, the link setup notification
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* callback updates the use count of all entities in the source and sink sides
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* of the link.
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*/
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/*
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* pipeline_pm_use_count - Count the number of users of a pipeline
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* @entity: The entity
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*
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* Return the total number of users of all video device nodes in the pipeline.
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*/
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static int pipeline_pm_use_count(struct media_entity *entity,
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struct media_entity_graph *graph)
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{
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int use = 0;
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media_entity_graph_walk_start(graph, entity);
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while ((entity = media_entity_graph_walk_next(graph))) {
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if (is_media_entity_v4l2_video_device(entity))
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use += entity->use_count;
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}
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return use;
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}
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/*
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* pipeline_pm_power_one - Apply power change to an entity
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* @entity: The entity
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* @change: Use count change
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*
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* Change the entity use count by @change. If the entity is a subdev update its
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* power state by calling the core::s_power operation when the use count goes
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* from 0 to != 0 or from != 0 to 0.
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*
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* Return 0 on success or a negative error code on failure.
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*/
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static int pipeline_pm_power_one(struct media_entity *entity, int change)
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{
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struct v4l2_subdev *subdev;
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int ret;
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subdev = is_media_entity_v4l2_subdev(entity)
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? media_entity_to_v4l2_subdev(entity) : NULL;
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if (entity->use_count == 0 && change > 0 && subdev != NULL) {
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ret = v4l2_subdev_call(subdev, core, s_power, 1);
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if (ret < 0 && ret != -ENOIOCTLCMD)
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return ret;
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}
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entity->use_count += change;
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WARN_ON(entity->use_count < 0);
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if (entity->use_count == 0 && change < 0 && subdev != NULL)
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v4l2_subdev_call(subdev, core, s_power, 0);
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return 0;
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}
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/*
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* pipeline_pm_power - Apply power change to all entities in a pipeline
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* @entity: The entity
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* @change: Use count change
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*
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* Walk the pipeline to update the use count and the power state of all non-node
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* entities.
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*
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* Return 0 on success or a negative error code on failure.
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*/
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static int pipeline_pm_power(struct media_entity *entity, int change,
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struct media_entity_graph *graph)
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{
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struct media_entity *first = entity;
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int ret = 0;
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if (!change)
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return 0;
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media_entity_graph_walk_start(graph, entity);
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while (!ret && (entity = media_entity_graph_walk_next(graph)))
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if (is_media_entity_v4l2_subdev(entity))
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ret = pipeline_pm_power_one(entity, change);
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if (!ret)
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return ret;
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media_entity_graph_walk_start(graph, first);
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while ((first = media_entity_graph_walk_next(graph))
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&& first != entity)
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if (is_media_entity_v4l2_subdev(first))
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pipeline_pm_power_one(first, -change);
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return ret;
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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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struct media_device *mdev = entity->graph_obj.mdev;
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int change = use ? 1 : -1;
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int ret;
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mutex_lock(&mdev->graph_mutex);
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/* Apply use count to node. */
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entity->use_count += change;
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WARN_ON(entity->use_count < 0);
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/* Apply power change to connected non-nodes. */
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ret = pipeline_pm_power(entity, change, &mdev->pm_count_walk);
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if (ret < 0)
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entity->use_count -= change;
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mutex_unlock(&mdev->graph_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_use);
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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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{
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struct media_entity_graph *graph = &link->graph_obj.mdev->pm_count_walk;
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struct media_entity *source = link->source->entity;
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struct media_entity *sink = link->sink->entity;
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int source_use;
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int sink_use;
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int ret = 0;
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source_use = pipeline_pm_use_count(source, graph);
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sink_use = pipeline_pm_use_count(sink, graph);
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if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
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!(flags & MEDIA_LNK_FL_ENABLED)) {
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/* Powering off entities is assumed to never fail. */
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pipeline_pm_power(source, -sink_use, graph);
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pipeline_pm_power(sink, -source_use, graph);
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return 0;
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}
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if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
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(flags & MEDIA_LNK_FL_ENABLED)) {
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ret = pipeline_pm_power(source, sink_use, graph);
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if (ret < 0)
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return ret;
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ret = pipeline_pm_power(sink, source_use, graph);
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if (ret < 0)
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pipeline_pm_power(source, -sink_use, graph);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify);
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