592 lines
15 KiB
C
592 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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/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, pad_sink, pad_source;
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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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dev_warn(mdev->dev, "Didn't find any I/O entity\n");
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return -EINVAL;
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}
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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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dev_warn(mdev->dev, "Didn't find a MEDIA_ENT_F_IO_V4L\n");
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return -EINVAL;
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}
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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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dev_warn(mdev->dev, "Failed to create a sensor link\n");
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return ret;
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}
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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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dev_warn(mdev->dev, "Decoder not found\n");
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return -EINVAL;
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}
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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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pad_source = media_get_pad_index(tuner, false,
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PAD_SIGNAL_ANALOG);
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pad_sink = media_get_pad_index(if_vid, true,
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PAD_SIGNAL_ANALOG);
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if (pad_source < 0 || pad_sink < 0) {
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dev_warn(mdev->dev, "Couldn't get tuner and/or PLL pad(s): (%d, %d)\n",
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pad_source, pad_sink);
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return -EINVAL;
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}
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ret = media_create_pad_link(tuner, pad_source,
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if_vid, pad_sink,
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MEDIA_LNK_FL_ENABLED);
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if (ret) {
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dev_warn(mdev->dev, "Couldn't create tuner->PLL link)\n");
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return ret;
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}
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pad_source = media_get_pad_index(if_vid, false,
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PAD_SIGNAL_ANALOG);
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pad_sink = media_get_pad_index(decoder, true,
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PAD_SIGNAL_ANALOG);
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if (pad_source < 0 || pad_sink < 0) {
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dev_warn(mdev->dev, "get decoder and/or PLL pad(s): (%d, %d)\n",
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pad_source, pad_sink);
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return -EINVAL;
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}
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ret = media_create_pad_link(if_vid, pad_source,
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decoder, pad_sink,
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MEDIA_LNK_FL_ENABLED);
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if (ret) {
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dev_warn(mdev->dev, "couldn't link PLL to decoder\n");
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return ret;
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}
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} else {
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pad_source = media_get_pad_index(tuner, false,
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PAD_SIGNAL_ANALOG);
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pad_sink = media_get_pad_index(decoder, true,
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PAD_SIGNAL_ANALOG);
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if (pad_source < 0 || pad_sink < 0) {
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dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s): (%d, %d)\n",
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pad_source, pad_sink);
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return -EINVAL;
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}
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ret = media_create_pad_link(tuner, pad_source,
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decoder, pad_sink,
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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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pad_source = media_get_pad_index(tuner, false,
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PAD_SIGNAL_AUDIO);
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pad_sink = media_get_pad_index(if_aud, true,
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PAD_SIGNAL_AUDIO);
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if (pad_source < 0 || pad_sink < 0) {
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dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s) for audio: (%d, %d)\n",
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pad_source, pad_sink);
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return -EINVAL;
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}
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ret = media_create_pad_link(tuner, pad_source,
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if_aud, pad_sink,
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MEDIA_LNK_FL_ENABLED);
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if (ret) {
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dev_warn(mdev->dev, "couldn't link tuner->audio PLL\n");
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return ret;
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}
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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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pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
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if (pad_source < 0) {
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dev_warn(mdev->dev, "couldn't get decoder output pad for V4L I/O\n");
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return -EINVAL;
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}
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ret = media_create_pad_link(decoder, pad_source,
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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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dev_warn(mdev->dev, "couldn't link decoder output to V4L I/O\n");
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return ret;
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}
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}
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if (io_swradio) {
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pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
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if (pad_source < 0) {
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dev_warn(mdev->dev, "couldn't get decoder output pad for SDR\n");
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return -EINVAL;
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}
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ret = media_create_pad_link(decoder, pad_source,
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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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dev_warn(mdev->dev, "couldn't link decoder output to SDR\n");
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return ret;
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}
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}
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if (io_vbi) {
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pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
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if (pad_source < 0) {
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dev_warn(mdev->dev, "couldn't get decoder output pad for VBI\n");
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return -EINVAL;
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}
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ret = media_create_pad_link(decoder, pad_source,
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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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dev_warn(mdev->dev, "couldn't link decoder output to VBI\n");
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return ret;
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}
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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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pad_sink = media_get_pad_index(tuner, true,
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PAD_SIGNAL_ANALOG);
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if (pad_sink < 0) {
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dev_warn(mdev->dev, "couldn't get tuner analog pad sink\n");
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return -EINVAL;
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}
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ret = media_create_pad_link(entity, 0, tuner,
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pad_sink,
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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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pad_sink = media_get_pad_index(decoder, true,
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PAD_SIGNAL_ANALOG);
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if (pad_sink < 0) {
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dev_warn(mdev->dev, "couldn't get decoder analog pad sink\n");
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return -EINVAL;
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}
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ret = media_create_pad_link(entity, 0, decoder,
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pad_sink,
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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 = 0, err;
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if (!mdev)
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return 0;
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mutex_lock(&mdev->graph_mutex);
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if (!mdev->enable_source)
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goto end;
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err = mdev->enable_source(&vdev->entity, &vdev->pipe);
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if (err)
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ret = -EBUSY;
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end:
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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(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) {
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mutex_lock(&mdev->graph_mutex);
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if (mdev->disable_source)
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mdev->disable_source(&vdev->entity);
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mutex_unlock(&mdev->graph_mutex);
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}
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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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int v4l2_create_fwnode_links_to_pad(struct v4l2_subdev *src_sd,
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struct media_pad *sink, u32 flags)
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{
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struct fwnode_handle *endpoint;
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struct v4l2_subdev *sink_sd;
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if (!(sink->flags & MEDIA_PAD_FL_SINK) ||
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!is_media_entity_v4l2_subdev(sink->entity))
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return -EINVAL;
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sink_sd = media_entity_to_v4l2_subdev(sink->entity);
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fwnode_graph_for_each_endpoint(dev_fwnode(src_sd->dev), endpoint) {
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struct fwnode_handle *remote_ep;
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int src_idx, sink_idx, ret;
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struct media_pad *src;
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src_idx = media_entity_get_fwnode_pad(&src_sd->entity,
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endpoint,
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MEDIA_PAD_FL_SOURCE);
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if (src_idx < 0)
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continue;
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remote_ep = fwnode_graph_get_remote_endpoint(endpoint);
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if (!remote_ep)
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continue;
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/*
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* ask the sink to verify it owns the remote endpoint,
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* and translate to a sink pad.
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*/
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sink_idx = media_entity_get_fwnode_pad(&sink_sd->entity,
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remote_ep,
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MEDIA_PAD_FL_SINK);
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fwnode_handle_put(remote_ep);
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if (sink_idx < 0 || sink_idx != sink->index)
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continue;
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/*
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* the source endpoint corresponds to one of its source pads,
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* the source endpoint connects to an endpoint at the sink
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* entity, and the sink endpoint corresponds to the sink
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* pad requested, so we have found an endpoint connection
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* that works, create the media link for it.
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*/
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src = &src_sd->entity.pads[src_idx];
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/* skip if link already exists */
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if (media_entity_find_link(src, sink))
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continue;
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|
||
|
|
dev_dbg(sink_sd->dev, "creating link %s:%d -> %s:%d\n",
|
||
|
|
src_sd->entity.name, src_idx,
|
||
|
|
sink_sd->entity.name, sink_idx);
|
||
|
|
|
||
|
|
ret = media_create_pad_link(&src_sd->entity, src_idx,
|
||
|
|
&sink_sd->entity, sink_idx, flags);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(sink_sd->dev,
|
||
|
|
"link %s:%d -> %s:%d failed with %d\n",
|
||
|
|
src_sd->entity.name, src_idx,
|
||
|
|
sink_sd->entity.name, sink_idx, ret);
|
||
|
|
|
||
|
|
fwnode_handle_put(endpoint);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links_to_pad);
|
||
|
|
|
||
|
|
int v4l2_create_fwnode_links(struct v4l2_subdev *src_sd,
|
||
|
|
struct v4l2_subdev *sink_sd)
|
||
|
|
{
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for (i = 0; i < sink_sd->entity.num_pads; i++) {
|
||
|
|
struct media_pad *pad = &sink_sd->entity.pads[i];
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (!(pad->flags & MEDIA_PAD_FL_SINK))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
ret = v4l2_create_fwnode_links_to_pad(src_sd, pad, 0);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_create_fwnode_links);
|
||
|
|
|
||
|
|
/* -----------------------------------------------------------------------------
|
||
|
|
* Pipeline power management
|
||
|
|
*
|
||
|
|
* Entities must be powered up when part of a pipeline that contains at least
|
||
|
|
* one open video device node.
|
||
|
|
*
|
||
|
|
* To achieve this use the entity use_count field to track the number of users.
|
||
|
|
* For entities corresponding to video device nodes the use_count field stores
|
||
|
|
* the users count of the node. For entities corresponding to subdevs the
|
||
|
|
* use_count field stores the total number of users of all video device nodes
|
||
|
|
* in the pipeline.
|
||
|
|
*
|
||
|
|
* The v4l2_pipeline_pm_{get, put}() functions must be called in the open() and
|
||
|
|
* close() handlers of video device nodes. It increments or decrements the use
|
||
|
|
* count of all subdev entities in the pipeline.
|
||
|
|
*
|
||
|
|
* To react to link management on powered pipelines, the link setup notification
|
||
|
|
* callback updates the use count of all entities in the source and sink sides
|
||
|
|
* of the link.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* pipeline_pm_use_count - Count the number of users of a pipeline
|
||
|
|
* @entity: The entity
|
||
|
|
*
|
||
|
|
* Return the total number of users of all video device nodes in the pipeline.
|
||
|
|
*/
|
||
|
|
static int pipeline_pm_use_count(struct media_entity *entity,
|
||
|
|
struct media_graph *graph)
|
||
|
|
{
|
||
|
|
int use = 0;
|
||
|
|
|
||
|
|
media_graph_walk_start(graph, entity);
|
||
|
|
|
||
|
|
while ((entity = media_graph_walk_next(graph))) {
|
||
|
|
if (is_media_entity_v4l2_video_device(entity))
|
||
|
|
use += entity->use_count;
|
||
|
|
}
|
||
|
|
|
||
|
|
return use;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* pipeline_pm_power_one - Apply power change to an entity
|
||
|
|
* @entity: The entity
|
||
|
|
* @change: Use count change
|
||
|
|
*
|
||
|
|
* Change the entity use count by @change. If the entity is a subdev update its
|
||
|
|
* power state by calling the core::s_power operation when the use count goes
|
||
|
|
* from 0 to != 0 or from != 0 to 0.
|
||
|
|
*
|
||
|
|
* Return 0 on success or a negative error code on failure.
|
||
|
|
*/
|
||
|
|
static int pipeline_pm_power_one(struct media_entity *entity, int change)
|
||
|
|
{
|
||
|
|
struct v4l2_subdev *subdev;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
subdev = is_media_entity_v4l2_subdev(entity)
|
||
|
|
? media_entity_to_v4l2_subdev(entity) : NULL;
|
||
|
|
|
||
|
|
if (entity->use_count == 0 && change > 0 && subdev != NULL) {
|
||
|
|
ret = v4l2_subdev_call(subdev, core, s_power, 1);
|
||
|
|
if (ret < 0 && ret != -ENOIOCTLCMD)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
entity->use_count += change;
|
||
|
|
WARN_ON(entity->use_count < 0);
|
||
|
|
|
||
|
|
if (entity->use_count == 0 && change < 0 && subdev != NULL)
|
||
|
|
v4l2_subdev_call(subdev, core, s_power, 0);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* pipeline_pm_power - Apply power change to all entities in a pipeline
|
||
|
|
* @entity: The entity
|
||
|
|
* @change: Use count change
|
||
|
|
*
|
||
|
|
* Walk the pipeline to update the use count and the power state of all non-node
|
||
|
|
* entities.
|
||
|
|
*
|
||
|
|
* Return 0 on success or a negative error code on failure.
|
||
|
|
*/
|
||
|
|
static int pipeline_pm_power(struct media_entity *entity, int change,
|
||
|
|
struct media_graph *graph)
|
||
|
|
{
|
||
|
|
struct media_entity *first = entity;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
if (!change)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
media_graph_walk_start(graph, entity);
|
||
|
|
|
||
|
|
while (!ret && (entity = media_graph_walk_next(graph)))
|
||
|
|
if (is_media_entity_v4l2_subdev(entity))
|
||
|
|
ret = pipeline_pm_power_one(entity, change);
|
||
|
|
|
||
|
|
if (!ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
media_graph_walk_start(graph, first);
|
||
|
|
|
||
|
|
while ((first = media_graph_walk_next(graph))
|
||
|
|
&& first != entity)
|
||
|
|
if (is_media_entity_v4l2_subdev(first))
|
||
|
|
pipeline_pm_power_one(first, -change);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int v4l2_pipeline_pm_use(struct media_entity *entity, unsigned int use)
|
||
|
|
{
|
||
|
|
struct media_device *mdev = entity->graph_obj.mdev;
|
||
|
|
int change = use ? 1 : -1;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
mutex_lock(&mdev->graph_mutex);
|
||
|
|
|
||
|
|
/* Apply use count to node. */
|
||
|
|
entity->use_count += change;
|
||
|
|
WARN_ON(entity->use_count < 0);
|
||
|
|
|
||
|
|
/* Apply power change to connected non-nodes. */
|
||
|
|
ret = pipeline_pm_power(entity, change, &mdev->pm_count_walk);
|
||
|
|
if (ret < 0)
|
||
|
|
entity->use_count -= change;
|
||
|
|
|
||
|
|
mutex_unlock(&mdev->graph_mutex);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int v4l2_pipeline_pm_get(struct media_entity *entity)
|
||
|
|
{
|
||
|
|
return v4l2_pipeline_pm_use(entity, 1);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_get);
|
||
|
|
|
||
|
|
void v4l2_pipeline_pm_put(struct media_entity *entity)
|
||
|
|
{
|
||
|
|
/* Powering off entities shouldn't fail. */
|
||
|
|
WARN_ON(v4l2_pipeline_pm_use(entity, 0));
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_put);
|
||
|
|
|
||
|
|
int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
|
||
|
|
unsigned int notification)
|
||
|
|
{
|
||
|
|
struct media_graph *graph = &link->graph_obj.mdev->pm_count_walk;
|
||
|
|
struct media_entity *source = link->source->entity;
|
||
|
|
struct media_entity *sink = link->sink->entity;
|
||
|
|
int source_use;
|
||
|
|
int sink_use;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
source_use = pipeline_pm_use_count(source, graph);
|
||
|
|
sink_use = pipeline_pm_use_count(sink, graph);
|
||
|
|
|
||
|
|
if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
|
||
|
|
!(flags & MEDIA_LNK_FL_ENABLED)) {
|
||
|
|
/* Powering off entities is assumed to never fail. */
|
||
|
|
pipeline_pm_power(source, -sink_use, graph);
|
||
|
|
pipeline_pm_power(sink, -source_use, graph);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
|
||
|
|
(flags & MEDIA_LNK_FL_ENABLED)) {
|
||
|
|
|
||
|
|
ret = pipeline_pm_power(source, sink_use, graph);
|
||
|
|
if (ret < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = pipeline_pm_power(sink, source_use, graph);
|
||
|
|
if (ret < 0)
|
||
|
|
pipeline_pm_power(source, -sink_use, graph);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify);
|