// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* vimc-core.c Virtual Media Controller Driver
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*
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* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
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*/
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#include <linux/font.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <media/media-device.h>
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#include <media/tpg/v4l2-tpg.h>
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#include <media/v4l2-device.h>
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#include "vimc-common.h"
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#define VIMC_MDEV_MODEL_NAME "VIMC MDEV"
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#define VIMC_ENT_LINK(src, srcpad, sink, sinkpad, link_flags) { \
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.src_ent = src, \
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.src_pad = srcpad, \
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.sink_ent = sink, \
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.sink_pad = sinkpad, \
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.flags = link_flags, \
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}
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/* Structure which describes links between entities */
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struct vimc_ent_link {
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unsigned int src_ent;
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u16 src_pad;
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unsigned int sink_ent;
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u16 sink_pad;
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u32 flags;
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};
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/* Structure which describes the whole topology */
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struct vimc_pipeline_config {
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const struct vimc_ent_config *ents;
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size_t num_ents;
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const struct vimc_ent_link *links;
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size_t num_links;
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};
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/* --------------------------------------------------------------------------
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* Topology Configuration
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*/
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static struct vimc_ent_config ent_config[] = {
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{
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.name = "Sensor A",
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.type = &vimc_sen_type
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},
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{
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.name = "Sensor B",
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.type = &vimc_sen_type
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},
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{
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.name = "Debayer A",
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.type = &vimc_deb_type
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},
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{
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.name = "Debayer B",
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.type = &vimc_deb_type
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},
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{
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.name = "Raw Capture 0",
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.type = &vimc_cap_type
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},
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{
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.name = "Raw Capture 1",
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.type = &vimc_cap_type
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},
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{
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/* TODO: change this to vimc-input when it is implemented */
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.name = "RGB/YUV Input",
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.type = &vimc_sen_type
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},
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{
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.name = "Scaler",
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.type = &vimc_sca_type
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},
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{
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.name = "RGB/YUV Capture",
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.type = &vimc_cap_type
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},
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};
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static const struct vimc_ent_link ent_links[] = {
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/* Link: Sensor A (Pad 0)->(Pad 0) Debayer A */
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VIMC_ENT_LINK(0, 0, 2, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
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/* Link: Sensor A (Pad 0)->(Pad 0) Raw Capture 0 */
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VIMC_ENT_LINK(0, 0, 4, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
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/* Link: Sensor B (Pad 0)->(Pad 0) Debayer B */
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VIMC_ENT_LINK(1, 0, 3, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
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/* Link: Sensor B (Pad 0)->(Pad 0) Raw Capture 1 */
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VIMC_ENT_LINK(1, 0, 5, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
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/* Link: Debayer A (Pad 1)->(Pad 0) Scaler */
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VIMC_ENT_LINK(2, 1, 7, 0, MEDIA_LNK_FL_ENABLED),
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/* Link: Debayer B (Pad 1)->(Pad 0) Scaler */
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VIMC_ENT_LINK(3, 1, 7, 0, 0),
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/* Link: RGB/YUV Input (Pad 0)->(Pad 0) Scaler */
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VIMC_ENT_LINK(6, 0, 7, 0, 0),
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/* Link: Scaler (Pad 1)->(Pad 0) RGB/YUV Capture */
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VIMC_ENT_LINK(7, 1, 8, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
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};
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static struct vimc_pipeline_config pipe_cfg = {
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.ents = ent_config,
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.num_ents = ARRAY_SIZE(ent_config),
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.links = ent_links,
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.num_links = ARRAY_SIZE(ent_links)
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};
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/* -------------------------------------------------------------------------- */
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static void vimc_rm_links(struct vimc_device *vimc)
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{
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unsigned int i;
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for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
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media_entity_remove_links(vimc->ent_devs[i]->ent);
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}
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static int vimc_create_links(struct vimc_device *vimc)
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{
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unsigned int i;
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int ret;
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/* Initialize the links between entities */
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for (i = 0; i < vimc->pipe_cfg->num_links; i++) {
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const struct vimc_ent_link *link = &vimc->pipe_cfg->links[i];
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struct vimc_ent_device *ved_src =
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vimc->ent_devs[link->src_ent];
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struct vimc_ent_device *ved_sink =
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vimc->ent_devs[link->sink_ent];
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ret = media_create_pad_link(ved_src->ent, link->src_pad,
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ved_sink->ent, link->sink_pad,
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link->flags);
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if (ret)
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goto err_rm_links;
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}
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return 0;
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err_rm_links:
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vimc_rm_links(vimc);
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return ret;
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}
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static void vimc_release_subdevs(struct vimc_device *vimc)
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{
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unsigned int i;
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for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
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if (vimc->ent_devs[i])
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vimc->pipe_cfg->ents[i].type->release(vimc->ent_devs[i]);
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}
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static void vimc_unregister_subdevs(struct vimc_device *vimc)
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{
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unsigned int i;
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for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
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if (vimc->ent_devs[i] && vimc->pipe_cfg->ents[i].type->unregister)
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vimc->pipe_cfg->ents[i].type->unregister(vimc->ent_devs[i]);
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}
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static int vimc_add_subdevs(struct vimc_device *vimc)
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{
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unsigned int i;
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for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
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dev_dbg(vimc->mdev.dev, "new entity for %s\n",
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vimc->pipe_cfg->ents[i].name);
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vimc->ent_devs[i] = vimc->pipe_cfg->ents[i].type->add(vimc,
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vimc->pipe_cfg->ents[i].name);
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if (IS_ERR(vimc->ent_devs[i])) {
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int err = PTR_ERR(vimc->ent_devs[i]);
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dev_err(vimc->mdev.dev, "adding entity %s failed (%d)\n",
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vimc->pipe_cfg->ents[i].name, err);
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vimc->ent_devs[i] = NULL;
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vimc_unregister_subdevs(vimc);
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vimc_release_subdevs(vimc);
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return err;
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}
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}
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return 0;
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}
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static void vimc_v4l2_dev_release(struct v4l2_device *v4l2_dev)
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{
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struct vimc_device *vimc =
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container_of(v4l2_dev, struct vimc_device, v4l2_dev);
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vimc_release_subdevs(vimc);
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media_device_cleanup(&vimc->mdev);
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kfree(vimc->ent_devs);
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kfree(vimc);
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}
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static int vimc_register_devices(struct vimc_device *vimc)
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{
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int ret;
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/* Register the v4l2 struct */
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ret = v4l2_device_register(vimc->mdev.dev, &vimc->v4l2_dev);
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if (ret) {
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dev_err(vimc->mdev.dev,
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"v4l2 device register failed (err=%d)\n", ret);
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return ret;
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}
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/* allocate ent_devs */
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vimc->ent_devs = kcalloc(vimc->pipe_cfg->num_ents,
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sizeof(*vimc->ent_devs), GFP_KERNEL);
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if (!vimc->ent_devs) {
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ret = -ENOMEM;
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goto err_v4l2_unregister;
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}
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/* Invoke entity config hooks to initialize and register subdevs */
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ret = vimc_add_subdevs(vimc);
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if (ret)
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goto err_free_ent_devs;
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/* Initialize links */
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ret = vimc_create_links(vimc);
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if (ret)
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goto err_rm_subdevs;
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/* Register the media device */
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ret = media_device_register(&vimc->mdev);
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if (ret) {
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dev_err(vimc->mdev.dev,
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"media device register failed (err=%d)\n", ret);
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goto err_rm_subdevs;
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}
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/* Expose all subdev's nodes*/
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ret = v4l2_device_register_subdev_nodes(&vimc->v4l2_dev);
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if (ret) {
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dev_err(vimc->mdev.dev,
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"vimc subdev nodes registration failed (err=%d)\n",
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ret);
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goto err_mdev_unregister;
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}
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return 0;
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err_mdev_unregister:
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media_device_unregister(&vimc->mdev);
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err_rm_subdevs:
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vimc_unregister_subdevs(vimc);
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vimc_release_subdevs(vimc);
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err_free_ent_devs:
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kfree(vimc->ent_devs);
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err_v4l2_unregister:
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v4l2_device_unregister(&vimc->v4l2_dev);
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return ret;
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}
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static int vimc_probe(struct platform_device *pdev)
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{
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const struct font_desc *font = find_font("VGA8x16");
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struct vimc_device *vimc;
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int ret;
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dev_dbg(&pdev->dev, "probe");
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if (!font) {
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dev_err(&pdev->dev, "could not find font\n");
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return -ENODEV;
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}
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tpg_set_font(font->data);
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vimc = kzalloc(sizeof(*vimc), GFP_KERNEL);
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if (!vimc)
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return -ENOMEM;
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vimc->pipe_cfg = &pipe_cfg;
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/* Link the media device within the v4l2_device */
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vimc->v4l2_dev.mdev = &vimc->mdev;
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/* Initialize media device */
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strscpy(vimc->mdev.model, VIMC_MDEV_MODEL_NAME,
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sizeof(vimc->mdev.model));
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snprintf(vimc->mdev.bus_info, sizeof(vimc->mdev.bus_info),
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"platform:%s", VIMC_PDEV_NAME);
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vimc->mdev.dev = &pdev->dev;
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media_device_init(&vimc->mdev);
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ret = vimc_register_devices(vimc);
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if (ret) {
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media_device_cleanup(&vimc->mdev);
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kfree(vimc);
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return ret;
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}
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/*
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* the release cb is set only after successful registration.
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* if the registration fails, we release directly from probe
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*/
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vimc->v4l2_dev.release = vimc_v4l2_dev_release;
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platform_set_drvdata(pdev, vimc);
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return 0;
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}
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static int vimc_remove(struct platform_device *pdev)
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{
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struct vimc_device *vimc = platform_get_drvdata(pdev);
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dev_dbg(&pdev->dev, "remove");
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vimc_unregister_subdevs(vimc);
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media_device_unregister(&vimc->mdev);
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v4l2_device_unregister(&vimc->v4l2_dev);
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v4l2_device_put(&vimc->v4l2_dev);
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return 0;
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}
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static void vimc_dev_release(struct device *dev)
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{
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}
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static struct platform_device vimc_pdev = {
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.name = VIMC_PDEV_NAME,
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.dev.release = vimc_dev_release,
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};
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static struct platform_driver vimc_pdrv = {
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.probe = vimc_probe,
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.remove = vimc_remove,
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.driver = {
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.name = VIMC_PDEV_NAME,
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},
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};
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static int __init vimc_init(void)
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{
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int ret;
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ret = platform_device_register(&vimc_pdev);
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if (ret) {
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dev_err(&vimc_pdev.dev,
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"platform device registration failed (err=%d)\n", ret);
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return ret;
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}
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ret = platform_driver_register(&vimc_pdrv);
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if (ret) {
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dev_err(&vimc_pdev.dev,
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"platform driver registration failed (err=%d)\n", ret);
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platform_driver_unregister(&vimc_pdrv);
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return ret;
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}
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return 0;
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}
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static void __exit vimc_exit(void)
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{
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platform_driver_unregister(&vimc_pdrv);
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platform_device_unregister(&vimc_pdev);
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}
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module_init(vimc_init);
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module_exit(vimc_exit);
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MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC)");
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MODULE_AUTHOR("Helen Fornazier <helen.fornazier@gmail.com>");
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MODULE_LICENSE("GPL");
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