Re: [PATCH v2 1/2] media: vimc: Collapse component structure into a single monolithic driver

Helen Koike
2019-08-16T20:35:24Z

Hi Shuah,

Thanks for the patch, just some small comments below.

On 8/15/19 4:42 PM, Shuah Khan wrote:
> vimc uses Component API to split the driver into functional components.
> The real hardware resembles a monolith structure than component and
> component structure added a level of complexity making it hard to
> maintain without adding any real benefit.
>
> The sensor is one vimc component that would makes sense to be a separate
> module to closely align with the real hardware. It would be easier to
> collapse vimc into single monolithic driver first and then split the
> sensor off as a separate module.
>
> Collapse it into a single monolithic driver removing the Component API.
> This patch removes the component API and makes minimal changes to the
> code base preserving the functional division of the code structure.
> Preserving the functional structure allows us to split the sensor off
> as a separate module in the future.
>
> Major design elements in this change are:
> - Use existing struct vimc_ent_config and struct vimc_pipeline_config
> to drive the initialization of the functional components.
> - Make vimc_device and vimc_ent_config global by moving them to
> vimc-common.h
> - Add two new hooks add and rm to initialize and register, unregister
> and free subdevs.
> - All component API is now gone and bind and unbind hooks are modified
> to do "add" and "rm" with minimal changes to just add and rm subdevs.
> - vimc-core's bind and unbind are now register and unregister.
> - vimc-core invokes "add" hooks from its vimc_register_devices().
> The "add" hooks remain the same and register subdevs. They don't
> create platform devices of their own and use vimc's pdev.dev as
> their reference device. The "add" hooks save their vimc_ent_device(s)
> in the corresponding vimc_ent_config.
> - vimc-core invokes "rm" hooks from its unregister to unregister subdevs
> and cleanup.
> - vimc-core invokes "add" and "rm" hooks with pointer to struct vimc_device
> and the corresponding struct vimc_ent_config pointer.
>
> The following configure and stream test works on all devices.
>
> media-ctl -d platform:vimc -V '"Sensor A":0[fmt:SBGGR8_1X8/640x480]'
> media-ctl -d platform:vimc -V '"Debayer A":0[fmt:SBGGR8_1X8/640x480]'
> media-ctl -d platform:vimc -V '"Sensor B":0[fmt:SBGGR8_1X8/640x480]'
> media-ctl -d platform:vimc -V '"Debayer B":0[fmt:SBGGR8_1X8/640x480]'
>
> v4l2-ctl -z platform:vimc -d "RGB/YUV Capture" -v width=1920,height=1440
> v4l2-ctl -z platform:vimc -d "Raw Capture 0" -v pixelformat=BA81
> v4l2-ctl -z platform:vimc -d "Raw Capture 1" -v pixelformat=BA81
>
> v4l2-ctl --stream-mmap --stream-count=100 -d /dev/video1
> v4l2-ctl --stream-mmap --stream-count=100 -d /dev/video2
> v4l2-ctl --stream-mmap --stream-count=100 -d /dev/video3
>
> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
> ---
> drivers/media/platform/vimc/Makefile | 7 +-
> drivers/media/platform/vimc/vimc-capture.c | 75 ++-------
> drivers/media/platform/vimc/vimc-common.h | 54 ++++++
> drivers/media/platform/vimc/vimc-core.c | 182 +++++++--------------
> drivers/media/platform/vimc/vimc-debayer.c | 68 ++------
> drivers/media/platform/vimc/vimc-scaler.c | 68 ++------
> drivers/media/platform/vimc/vimc-sensor.c | 69 ++------
> 7 files changed, 157 insertions(+), 366 deletions(-)
>
> diff --git a/drivers/media/platform/vimc/Makefile b/drivers/media/platform/vimc/Makefile
> index 96d06f030c31..a53b2b532e9f 100644
> --- a/drivers/media/platform/vimc/Makefile
> +++ b/drivers/media/platform/vimc/Makefile
> @@ -1,5 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> -vimc-y := vimc-core.o vimc-common.o vimc-streamer.o
> +vimc-y := vimc-core.o vimc-common.o vimc-streamer.o vimc-capture.o \
> + vimc-debayer.o vimc-scaler.o vimc-sensor.o
> +
> +obj-$(CONFIG_VIDEO_VIMC) += vimc.o
>
> -obj-$(CONFIG_VIDEO_VIMC) += vimc.o vimc-capture.o vimc-debayer.o \
> - vimc-scaler.o vimc-sensor.o
> diff --git a/drivers/media/platform/vimc/vimc-capture.c b/drivers/media/platform/vimc/vimc-capture.c
> index 664855708fdf..0b5cd38fbeb9 100644
> --- a/drivers/media/platform/vimc/vimc-capture.c
> +++ b/drivers/media/platform/vimc/vimc-capture.c
> @@ -5,10 +5,6 @@
> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
> */
>
> -#include <linux/component.h>
> -#include <linux/module.h>
> -#include <linux/mod_devicetable.h>
> -#include <linux/platform_device.h>
> #include <media/v4l2-ioctl.h>
> #include <media/videobuf2-core.h>
> #include <media/videobuf2-vmalloc.h>
> @@ -16,8 +12,6 @@
> #include "vimc-common.h"
> #include "vimc-streamer.h"
>
> -#define VIMC_CAP_DRV_NAME "vimc-capture"
> -
> static const u32 vimc_cap_supported_pixfmt[] = {
> V4L2_PIX_FMT_BGR24,
> V4L2_PIX_FMT_RGB24,
> @@ -367,11 +361,11 @@ static void vimc_cap_release(struct video_device *vdev)
> kfree(vcap);
> }
>
> -static void vimc_cap_comp_unbind(struct device *comp, struct device *master,
> - void *master_data)
> +void vimc_cap_rm(struct vimc_device *vimc, struct vimc_ent_config *vent)

This is just a detail (is up to you), but I would rename vent to something what
would reflect the "config" part of vimc_ent_config, maybe vec to contrast with ved?
Or vent_c ?
As I said is it just a detail to help not to confuse it with the vimc_ent_device.
Feel free to take this suggestion or not.

This comment also applies to other usages of vimc_add_subdevs below.

> {
> - struct vimc_ent_device *ved = dev_get_drvdata(comp);
> - struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
> + struct vimc_ent_device *ved = vent->ved;
> + struct vimc_cap_device *vcap = container_of(ved,
> + struct vimc_cap_device,
> ved);
>
> vb2_queue_release(&vcap->queue);
> @@ -418,11 +412,9 @@ static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
> return NULL;
> }
>
> -static int vimc_cap_comp_bind(struct device *comp, struct device *master,
> - void *master_data)
> +int vimc_cap_add(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct v4l2_device *v4l2_dev = master_data;
> - struct vimc_platform_data *pdata = comp->platform_data;
> + struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
> struct vimc_cap_device *vcap;
> struct video_device *vdev;
> struct vb2_queue *q;
> @@ -442,7 +434,7 @@ static int vimc_cap_comp_bind(struct device *comp, struct device *master,
> }
>
> /* Initialize the media entity */
> - vcap->vdev.entity.name = pdata->entity_name;
> + vcap->vdev.entity.name = vent->name;
> vcap->vdev.entity.function = MEDIA_ENT_F_IO_V4L;
> ret = media_entity_pads_init(&vcap->vdev.entity,
> 1, vcap->ved.pads);
> @@ -466,8 +458,8 @@ static int vimc_cap_comp_bind(struct device *comp, struct device *master,
>
> ret = vb2_queue_init(q);
> if (ret) {
> - dev_err(comp, "%s: vb2 queue init failed (err=%d)\n",
> - pdata->entity_name, ret);
> + dev_err(&vimc->pdev.dev, "%s: vb2 queue init failed (err=%d)\n",
> + vent->name, ret);
> goto err_clean_m_ent;
> }
>
> @@ -484,8 +476,7 @@ static int vimc_cap_comp_bind(struct device *comp, struct device *master,
> vcap->ved.ent = &vcap->vdev.entity;
> vcap->ved.process_frame = vimc_cap_process_frame;
> vcap->ved.vdev_get_format = vimc_cap_get_format;
> - dev_set_drvdata(comp, &vcap->ved);
> - vcap->dev = comp;
> + vcap->dev = &vimc->pdev.dev;
>
> /* Initialize the video_device struct */
> vdev = &vcap->vdev;
> @@ -498,17 +489,18 @@ static int vimc_cap_comp_bind(struct device *comp, struct device *master,
> vdev->queue = q;
> vdev->v4l2_dev = v4l2_dev;
> vdev->vfl_dir = VFL_DIR_RX;
> - strscpy(vdev->name, pdata->entity_name, sizeof(vdev->name));
> + strscpy(vdev->name, vent->name, sizeof(vdev->name));
> video_set_drvdata(vdev, &vcap->ved);
>
> /* Register the video_device with the v4l2 and the media framework */
> ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> if (ret) {
> - dev_err(comp, "%s: video register failed (err=%d)\n",
> + dev_err(&vimc->pdev.dev, "%s: video register failed (err=%d)\n",
> vcap->vdev.name, ret);
> goto err_release_queue;
> }
>
> + vent->ved = &vcap->ved;
> return 0;
>
> err_release_queue:
> @@ -522,44 +514,3 @@ static int vimc_cap_comp_bind(struct device *comp, struct device *master,
>
> return ret;
> }
> -
> -static const struct component_ops vimc_cap_comp_ops = {
> - .bind = vimc_cap_comp_bind,
> - .unbind = vimc_cap_comp_unbind,
> -};
> -
> -static int vimc_cap_probe(struct platform_device *pdev)
> -{
> - return component_add(&pdev->dev, &vimc_cap_comp_ops);
> -}
> -
> -static int vimc_cap_remove(struct platform_device *pdev)
> -{
> - component_del(&pdev->dev, &vimc_cap_comp_ops);
> -
> - return 0;
> -}
> -
> -static const struct platform_device_id vimc_cap_driver_ids[] = {
> - {
> - .name = VIMC_CAP_DRV_NAME,
> - },
> - { }
> -};
> -
> -static struct platform_driver vimc_cap_pdrv = {
> - .probe = vimc_cap_probe,
> - .remove = vimc_cap_remove,
> - .id_table = vimc_cap_driver_ids,
> - .driver = {
> - .name = VIMC_CAP_DRV_NAME,
> - },
> -};
> -
> -module_platform_driver(vimc_cap_pdrv);
> -
> -MODULE_DEVICE_TABLE(platform, vimc_cap_driver_ids);
> -
> -MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Capture");
> -MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
> -MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/vimc/vimc-common.h b/drivers/media/platform/vimc/vimc-common.h
> index 7b4d988b208b..cfc9143686b0 100644
> --- a/drivers/media/platform/vimc/vimc-common.h
> +++ b/drivers/media/platform/vimc/vimc-common.h
> @@ -9,6 +9,7 @@
> #define _VIMC_COMMON_H_
>
> #include <linux/slab.h>
> +#include <linux/platform_device.h>
> #include <media/media-device.h>
> #include <media/v4l2-device.h>
>
> @@ -69,6 +70,28 @@ struct vimc_platform_data {
> char entity_name[32];
> };
>
> +/**
> + * struct vimc_device - main device for vimc driver
> + *
> + * @pdev pointer to the platform device
> + * @pipe_cfg pointer to the vimc pipeline configuration structure
> + * @mdev the associated media_device parent
> + * @v4l2_dev Internal v4l2 parent device
> + */
> +struct vimc_device {
> + /* The platform device */

I think we can drop this comments in the struct as we have them in the top.

> + struct platform_device pdev;
> +
> + /* The pipeline configuration */
> + const struct vimc_pipeline_config *pipe_cfg;
> +
> + /* The Associated media_device parent */
> + struct media_device mdev;
> +
> + /* Internal v4l2 parent device */
> + struct v4l2_device v4l2_dev;
> +};
> +
> /**
> * struct vimc_ent_device - core struct that represents a node in the topology
> *
> @@ -97,6 +120,37 @@ struct vimc_ent_device {
> struct v4l2_pix_format *fmt);
> };
>
> +/**
> + * struct vimc_ent_config Structure which describes individual
> + * configuration for each entity
> + *
> + * @name entity name
> + * @ved pointer to vimc_ent_device (a node in the topology)
> + * @add subdev add hook - initializes and registers subdev
> + * called from vimc-core
> + * @rm subdev rm hook - unregisters and frees subdev
> + * called from vimc-core
> + */
> +struct vimc_ent_config {
> + const char *name;
> + struct vimc_ent_device *ved;
> + int (*add)(struct vimc_device *vimc, struct vimc_ent_config *vent);
> + void (*rm)(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +};
> +
> +/* prototypes for vimc_ent_config add and rm hooks */
> +int vimc_cap_add(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +void vimc_cap_rm(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +
> +int vimc_deb_add(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +void vimc_deb_rm(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +
> +int vimc_sca_add(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +void vimc_sca_rm(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +
> +int vimc_sen_add(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +void vimc_sen_rm(struct vimc_device *vimc, struct vimc_ent_config *vent);
> +
> /**
> * vimc_mbus_code_supported - helper to check supported mbus codes
> *
> diff --git a/drivers/media/platform/vimc/vimc-core.c b/drivers/media/platform/vimc/vimc-core.c
> index 571c55aa0e16..334f60468d06 100644
> --- a/drivers/media/platform/vimc/vimc-core.c
> +++ b/drivers/media/platform/vimc/vimc-core.c
> @@ -5,7 +5,6 @@
> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
> */
>
> -#include <linux/component.h>
> #include <linux/init.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> @@ -24,29 +23,6 @@
> .flags = link_flags, \
> }
>
> -struct vimc_device {
> - /* The platform device */
> - struct platform_device pdev;
> -
> - /* The pipeline configuration */
> - const struct vimc_pipeline_config *pipe_cfg;
> -
> - /* The Associated media_device parent */
> - struct media_device mdev;
> -
> - /* Internal v4l2 parent device*/
> - struct v4l2_device v4l2_dev;
> -
> - /* Subdevices */
> - struct platform_device **subdevs;
> -};
> -
> -/* Structure which describes individual configuration for each entity */
> -struct vimc_ent_config {
> - const char *name;
> - const char *drv;
> -};
> -
> /* Structure which describes links between entities */
> struct vimc_ent_link {
> unsigned int src_ent;
> @@ -58,7 +34,7 @@ struct vimc_ent_link {
>
> /* Structure which describes the whole topology */
> struct vimc_pipeline_config {
> - const struct vimc_ent_config *ents;
> + struct vimc_ent_config *ents;
> size_t num_ents;
> const struct vimc_ent_link *links;
> size_t num_links;
> @@ -68,43 +44,52 @@ struct vimc_pipeline_config {
> * Topology Configuration
> */
>
> -static const struct vimc_ent_config ent_config[] = {
> +static struct vimc_ent_config ent_config[] = {
> {
> .name = "Sensor A",
> - .drv = "vimc-sensor",
> + .add = vimc_sen_add,
> + .rm = vimc_sen_rm,
> },
> {
> .name = "Sensor B",
> - .drv = "vimc-sensor",
> + .add = vimc_sen_add,
> + .rm = vimc_sen_rm,
> },
> {
> .name = "Debayer A",
> - .drv = "vimc-debayer",
> + .add = vimc_deb_add,
> + .rm = vimc_deb_rm,
> },
> {
> .name = "Debayer B",
> - .drv = "vimc-debayer",
> + .add = vimc_deb_add,
> + .rm = vimc_deb_rm,
> },
> {
> .name = "Raw Capture 0",
> - .drv = "vimc-capture",
> + .add = vimc_cap_add,
> + .rm = vimc_cap_rm,
> },
> {
> .name = "Raw Capture 1",
> - .drv = "vimc-capture",
> + .add = vimc_cap_add,
> + .rm = vimc_cap_rm,
> },
> {
> - .name = "RGB/YUV Input",
> /* TODO: change this to vimc-input when it is implemented */
> - .drv = "vimc-sensor",
> + .name = "RGB/YUV Input",
> + .add = vimc_sen_add,
> + .rm = vimc_sen_rm,
> },
> {
> .name = "Scaler",
> - .drv = "vimc-scaler",
> + .add = vimc_sca_add,
> + .rm = vimc_sca_rm,
> },
> {
> .name = "RGB/YUV Capture",
> - .drv = "vimc-capture",
> + .add = vimc_cap_add,
> + .rm = vimc_cap_rm,
> },
> };
>
> @@ -127,7 +112,7 @@ static const struct vimc_ent_link ent_links[] = {
> VIMC_ENT_LINK(7, 1, 8, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
> };
>
> -static const struct vimc_pipeline_config pipe_cfg = {
> +static struct vimc_pipeline_config pipe_cfg = {
> .ents = ent_config,
> .num_ents = ARRAY_SIZE(ent_config),
> .links = ent_links,
> @@ -144,14 +129,11 @@ static int vimc_create_links(struct vimc_device *vimc)
> /* Initialize the links between entities */
> for (i = 0; i < vimc->pipe_cfg->num_links; i++) {
> const struct vimc_ent_link *link = &vimc->pipe_cfg->links[i];
> - /*
> - * TODO: Check another way of retrieving ved struct without
> - * relying on platform_get_drvdata
> - */
> +
> struct vimc_ent_device *ved_src =
> - platform_get_drvdata(vimc->subdevs[link->src_ent]);
> + vimc->pipe_cfg->ents[link->src_ent].ved;
> struct vimc_ent_device *ved_sink =
> - platform_get_drvdata(vimc->subdevs[link->sink_ent]);
> + vimc->pipe_cfg->ents[link->sink_ent].ved;
>
> ret = media_create_pad_link(ved_src->ent, link->src_pad,
> ved_sink->ent, link->sink_pad,
> @@ -163,13 +145,28 @@ static int vimc_create_links(struct vimc_device *vimc)
> return 0;
> }
>
> -static int vimc_comp_bind(struct device *master)
> +static int vimc_add_subdevs(struct vimc_device *vimc)
> {
> - struct vimc_device *vimc = container_of(to_platform_device(master),
> - struct vimc_device, pdev);
> + unsigned int i;
> int ret;
>
> - dev_dbg(master, "bind");
> + for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
> + dev_dbg(&vimc->pdev.dev, "new entity for %s\n",
> + vimc->pipe_cfg->ents[i].name);
> + ret = vimc->pipe_cfg->ents[i].add(vimc,
> + &vimc->pipe_cfg->ents[i]);
> + if (ret) {
> + dev_err(&vimc->pdev.dev, "add new entity for %s\n",
> + vimc->pipe_cfg->ents[i].name);
> + return ret;
> + }

If this fails, I think we should remove the subdevs that were added.

> + }
> + return 0;
> +}
> +
> +static int vimc_register_devices(struct vimc_device *vimc)
> +{
> + int ret;
>
> /* Register the v4l2 struct */
> ret = v4l2_device_register(vimc->mdev.dev, &vimc->v4l2_dev);
> @@ -179,22 +176,20 @@ static int vimc_comp_bind(struct device *master)
> return ret;
> }
>
> - /* Bind subdevices */
> - ret = component_bind_all(master, &vimc->v4l2_dev);
> - if (ret)
> - goto err_v4l2_unregister;
> + /* Invoke entity config hooks to initialize and register subdevs */
> + vimc_add_subdevs(vimc);

The return value should be checked here as well.

>
> /* Initialize links */
> ret = vimc_create_links(vimc);
> if (ret)
> - goto err_comp_unbind_all;
> + goto err_v4l2_unregister;
>
> /* Register the media device */
> ret = media_device_register(&vimc->mdev);
> if (ret) {
> dev_err(vimc->mdev.dev,
> "media device register failed (err=%d)\n", ret);
> - goto err_comp_unbind_all;
> + goto err_v4l2_unregister;
> }
>
> /* Expose all subdev's nodes*/
> @@ -211,98 +206,36 @@ static int vimc_comp_bind(struct device *master)
> err_mdev_unregister:
> media_device_unregister(&vimc->mdev);
> media_device_cleanup(&vimc->mdev);
> -err_comp_unbind_all:
> - component_unbind_all(master, NULL);
> err_v4l2_unregister:
> v4l2_device_unregister(&vimc->v4l2_dev);
>
> return ret;
> }
>
> -static void vimc_comp_unbind(struct device *master)
> +static void vimc_unregister(struct vimc_device *vimc)
> {
> - struct vimc_device *vimc = container_of(to_platform_device(master),
> - struct vimc_device, pdev);
> -
> - dev_dbg(master, "unbind");
> -
> media_device_unregister(&vimc->mdev);
> media_device_cleanup(&vimc->mdev);
> - component_unbind_all(master, NULL);
> v4l2_device_unregister(&vimc->v4l2_dev);
> }
>
> -static int vimc_comp_compare(struct device *comp, void *data)
> -{
> - return comp == data;
> -}
> -
> -static struct component_match *vimc_add_subdevs(struct vimc_device *vimc)
> -{
> - struct component_match *match = NULL;
> - struct vimc_platform_data pdata;
> - int i;
> -
> - for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
> - dev_dbg(&vimc->pdev.dev, "new pdev for %s\n",
> - vimc->pipe_cfg->ents[i].drv);
> -
> - strscpy(pdata.entity_name, vimc->pipe_cfg->ents[i].name,
> - sizeof(pdata.entity_name));
> -
> - vimc->subdevs[i] = platform_device_register_data(&vimc->pdev.dev,
> - vimc->pipe_cfg->ents[i].drv,
> - PLATFORM_DEVID_AUTO,
> - &pdata,
> - sizeof(pdata));
> - if (IS_ERR(vimc->subdevs[i])) {
> - match = ERR_CAST(vimc->subdevs[i]);
> - while (--i >= 0)
> - platform_device_unregister(vimc->subdevs[i]);
> -
> - return match;
> - }
> -
> - component_match_add(&vimc->pdev.dev, &match, vimc_comp_compare,
> - &vimc->subdevs[i]->dev);
> - }
> -
> - return match;
> -}
> -
> static void vimc_rm_subdevs(struct vimc_device *vimc)
> {
> unsigned int i;
>
> for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
> - platform_device_unregister(vimc->subdevs[i]);
> + vimc->pipe_cfg->ents[i].rm(vimc, &vimc->pipe_cfg->ents[i]);
> }
>
> -static const struct component_master_ops vimc_comp_ops = {
> - .bind = vimc_comp_bind,
> - .unbind = vimc_comp_unbind,
> -};
> -
> static int vimc_probe(struct platform_device *pdev)
> {
> struct vimc_device *vimc = container_of(pdev, struct vimc_device, pdev);
> - struct component_match *match = NULL;
> - int ret;
> + int ret = 0;

no need to init to zero

>
> dev_dbg(&pdev->dev, "probe");
>
> memset(&vimc->mdev, 0, sizeof(vimc->mdev));
>
> - /* Create platform_device for each entity in the topology*/
> - vimc->subdevs = devm_kcalloc(&vimc->pdev.dev, vimc->pipe_cfg->num_ents,
> - sizeof(*vimc->subdevs), GFP_KERNEL);
> - if (!vimc->subdevs)
> - return -ENOMEM;
> -
> - match = vimc_add_subdevs(vimc);
> - if (IS_ERR(match))
> - return PTR_ERR(match);
> -
> /* Link the media device within the v4l2_device */
> vimc->v4l2_dev.mdev = &vimc->mdev;
>
> @@ -314,16 +247,11 @@ static int vimc_probe(struct platform_device *pdev)
> vimc->mdev.dev = &pdev->dev;
> media_device_init(&vimc->mdev);
>
> - /* Add self to the component system */
> - ret = component_master_add_with_match(&pdev->dev, &vimc_comp_ops,
> - match);
> - if (ret) {
> + ret = vimc_register_devices(vimc);
> + if (ret)
> media_device_cleanup(&vimc->mdev);
> - vimc_rm_subdevs(vimc);
> - return ret;
> - }
>
> - return 0;
> + return ret;

I would leave the return 0 make it clear this is the success case.

Thanks
Helen

> }
>
> static int vimc_remove(struct platform_device *pdev)
> @@ -332,8 +260,8 @@ static int vimc_remove(struct platform_device *pdev)
>
> dev_dbg(&pdev->dev, "remove");
>
> - component_master_del(&pdev->dev, &vimc_comp_ops);
> vimc_rm_subdevs(vimc);
> + vimc_unregister(vimc);
>
> return 0;
> }
> diff --git a/drivers/media/platform/vimc/vimc-debayer.c b/drivers/media/platform/vimc/vimc-debayer.c
> index 00598fbf3cba..3b4e73c10a03 100644
> --- a/drivers/media/platform/vimc/vimc-debayer.c
> +++ b/drivers/media/platform/vimc/vimc-debayer.c
> @@ -5,19 +5,14 @@
> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
> */
>
> -#include <linux/component.h>
> #include <linux/module.h>
> -#include <linux/mod_devicetable.h>
> -#include <linux/platform_device.h>
> #include <linux/vmalloc.h>
> #include <linux/v4l2-mediabus.h>
> #include <media/v4l2-subdev.h>
>
> #include "vimc-common.h"
>
> -#define VIMC_DEB_DRV_NAME "vimc-debayer"
> -/* This module only supports transforming a bayer format
> - * to V4L2_PIX_FMT_RGB24
> +/* Supports transforming a bayer format to V4L2_PIX_FMT_RGB24
> */
> #define VIMC_DEB_SRC_PIXFMT V4L2_PIX_FMT_RGB24
> #define VIMC_DEB_SRC_MBUS_FMT_DEFAULT MEDIA_BUS_FMT_RGB888_1X24
> @@ -513,21 +508,19 @@ static const struct v4l2_subdev_internal_ops vimc_deb_int_ops = {
> .release = vimc_deb_release,
> };
>
> -static void vimc_deb_comp_unbind(struct device *comp, struct device *master,
> - void *master_data)
> +void vimc_deb_rm(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct vimc_ent_device *ved = dev_get_drvdata(comp);
> - struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,
> + struct vimc_ent_device *ved = vent->ved;
> + struct vimc_deb_device *vdeb = container_of(ved,
> + struct vimc_deb_device,
> ved);
>
> vimc_ent_sd_unregister(ved, &vdeb->sd);
> }
>
> -static int vimc_deb_comp_bind(struct device *comp, struct device *master,
> - void *master_data)
> +int vimc_deb_add(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct v4l2_device *v4l2_dev = master_data;
> - struct vimc_platform_data *pdata = comp->platform_data;
> + struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
> struct vimc_deb_device *vdeb;
> int ret;
>
> @@ -538,7 +531,7 @@ static int vimc_deb_comp_bind(struct device *comp, struct device *master,
>
> /* Initialize ved and sd */
> ret = vimc_ent_sd_register(&vdeb->ved, &vdeb->sd, v4l2_dev,
> - pdata->entity_name,
> + vent->name,
> MEDIA_ENT_F_PROC_VIDEO_PIXEL_ENC_CONV, 2,
> (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
> MEDIA_PAD_FL_SOURCE},
> @@ -549,8 +542,7 @@ static int vimc_deb_comp_bind(struct device *comp, struct device *master,
> }
>
> vdeb->ved.process_frame = vimc_deb_process_frame;
> - dev_set_drvdata(comp, &vdeb->ved);
> - vdeb->dev = comp;
> + vdeb->dev = &vimc->pdev.dev;
>
> /* Initialize the frame format */
> vdeb->sink_fmt = sink_fmt_default;
> @@ -563,46 +555,6 @@ static int vimc_deb_comp_bind(struct device *comp, struct device *master,
> */
> vdeb->set_rgb_src = vimc_deb_set_rgb_pix_rgb24;
>
> + vent->ved = &vdeb->ved;
> return 0;
> }
> -
> -static const struct component_ops vimc_deb_comp_ops = {
> - .bind = vimc_deb_comp_bind,
> - .unbind = vimc_deb_comp_unbind,
> -};
> -
> -static int vimc_deb_probe(struct platform_device *pdev)
> -{
> - return component_add(&pdev->dev, &vimc_deb_comp_ops);
> -}
> -
> -static int vimc_deb_remove(struct platform_device *pdev)
> -{
> - component_del(&pdev->dev, &vimc_deb_comp_ops);
> -
> - return 0;
> -}
> -
> -static const struct platform_device_id vimc_deb_driver_ids[] = {
> - {
> - .name = VIMC_DEB_DRV_NAME,
> - },
> - { }
> -};
> -
> -static struct platform_driver vimc_deb_pdrv = {
> - .probe = vimc_deb_probe,
> - .remove = vimc_deb_remove,
> - .id_table = vimc_deb_driver_ids,
> - .driver = {
> - .name = VIMC_DEB_DRV_NAME,
> - },
> -};
> -
> -module_platform_driver(vimc_deb_pdrv);
> -
> -MODULE_DEVICE_TABLE(platform, vimc_deb_driver_ids);
> -
> -MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Debayer");
> -MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
> -MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
> index c7123a45c55b..cb5eb42de69d 100644
> --- a/drivers/media/platform/vimc/vimc-scaler.c
> +++ b/drivers/media/platform/vimc/vimc-scaler.c
> @@ -5,18 +5,13 @@
> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
> */
>
> -#include <linux/component.h>
> #include <linux/module.h>
> -#include <linux/mod_devicetable.h>
> -#include <linux/platform_device.h>
> #include <linux/vmalloc.h>
> #include <linux/v4l2-mediabus.h>
> #include <media/v4l2-subdev.h>
>
> #include "vimc-common.h"
>
> -#define VIMC_SCA_DRV_NAME "vimc-scaler"
> -
> static unsigned int sca_mult = 3;
> module_param(sca_mult, uint, 0000);
> MODULE_PARM_DESC(sca_mult, " the image size multiplier");
> @@ -344,22 +339,21 @@ static const struct v4l2_subdev_internal_ops vimc_sca_int_ops = {
> .release = vimc_sca_release,
> };
>
> -static void vimc_sca_comp_unbind(struct device *comp, struct device *master,
> - void *master_data)
> +void vimc_sca_rm(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct vimc_ent_device *ved = dev_get_drvdata(comp);
> - struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
> + struct vimc_ent_device *ved = vent->ved;
> + struct vimc_sca_device *vsca = container_of(ved,
> + struct vimc_sca_device,
> ved);
>
> +
> vimc_ent_sd_unregister(ved, &vsca->sd);
> }
>
>
> -static int vimc_sca_comp_bind(struct device *comp, struct device *master,
> - void *master_data)
> +int vimc_sca_add(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct v4l2_device *v4l2_dev = master_data;
> - struct vimc_platform_data *pdata = comp->platform_data;
> + struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
> struct vimc_sca_device *vsca;
> int ret;
>
> @@ -370,7 +364,7 @@ static int vimc_sca_comp_bind(struct device *comp, struct device *master,
>
> /* Initialize ved and sd */
> ret = vimc_ent_sd_register(&vsca->ved, &vsca->sd, v4l2_dev,
> - pdata->entity_name,
> + vent->name,
> MEDIA_ENT_F_PROC_VIDEO_SCALER, 2,
> (const unsigned long[2]) {MEDIA_PAD_FL_SINK,
> MEDIA_PAD_FL_SOURCE},
> @@ -381,52 +375,12 @@ static int vimc_sca_comp_bind(struct device *comp, struct device *master,
> }
>
> vsca->ved.process_frame = vimc_sca_process_frame;
> - dev_set_drvdata(comp, &vsca->ved);
> - vsca->dev = comp;
> + vsca->dev = &vimc->pdev.dev;
> +
> + vent->ved = &vsca->ved;
>
> /* Initialize the frame format */
> vsca->sink_fmt = sink_fmt_default;
>
> return 0;
> }
> -
> -static const struct component_ops vimc_sca_comp_ops = {
> - .bind = vimc_sca_comp_bind,
> - .unbind = vimc_sca_comp_unbind,
> -};
> -
> -static int vimc_sca_probe(struct platform_device *pdev)
> -{
> - return component_add(&pdev->dev, &vimc_sca_comp_ops);
> -}
> -
> -static int vimc_sca_remove(struct platform_device *pdev)
> -{
> - component_del(&pdev->dev, &vimc_sca_comp_ops);
> -
> - return 0;
> -}
> -
> -static const struct platform_device_id vimc_sca_driver_ids[] = {
> - {
> - .name = VIMC_SCA_DRV_NAME,
> - },
> - { }
> -};
> -
> -static struct platform_driver vimc_sca_pdrv = {
> - .probe = vimc_sca_probe,
> - .remove = vimc_sca_remove,
> - .id_table = vimc_sca_driver_ids,
> - .driver = {
> - .name = VIMC_SCA_DRV_NAME,
> - },
> -};
> -
> -module_platform_driver(vimc_sca_pdrv);
> -
> -MODULE_DEVICE_TABLE(platform, vimc_sca_driver_ids);
> -
> -MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Scaler");
> -MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
> -MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/vimc/vimc-sensor.c b/drivers/media/platform/vimc/vimc-sensor.c
> index 51359472eef2..70b195b817a4 100644
> --- a/drivers/media/platform/vimc/vimc-sensor.c
> +++ b/drivers/media/platform/vimc/vimc-sensor.c
> @@ -5,10 +5,6 @@
> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
> */
>
> -#include <linux/component.h>
> -#include <linux/module.h>
> -#include <linux/mod_devicetable.h>
> -#include <linux/platform_device.h>
> #include <linux/v4l2-mediabus.h>
> #include <linux/vmalloc.h>
> #include <media/v4l2-ctrls.h>
> @@ -18,8 +14,6 @@
>
> #include "vimc-common.h"
>
> -#define VIMC_SEN_DRV_NAME "vimc-sensor"
> -
> struct vimc_sen_device {
> struct vimc_ent_device ved;
> struct v4l2_subdev sd;
> @@ -279,12 +273,12 @@ static const struct v4l2_subdev_internal_ops vimc_sen_int_ops = {
> .release = vimc_sen_release,
> };
>
> -static void vimc_sen_comp_unbind(struct device *comp, struct device *master,
> - void *master_data)
> +void vimc_sen_rm(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct vimc_ent_device *ved = dev_get_drvdata(comp);
> - struct vimc_sen_device *vsen =
> - container_of(ved, struct vimc_sen_device, ved);
> + struct vimc_ent_device *ved = vent->ved;
> + struct vimc_sen_device *vsen = container_of(ved,
> + struct vimc_sen_device,
> + ved);
>
> vimc_ent_sd_unregister(ved, &vsen->sd);
> }
> @@ -306,11 +300,9 @@ static const struct v4l2_ctrl_config vimc_sen_ctrl_test_pattern = {
> .qmenu = tpg_pattern_strings,
> };
>
> -static int vimc_sen_comp_bind(struct device *comp, struct device *master,
> - void *master_data)
> +int vimc_sen_add(struct vimc_device *vimc, struct vimc_ent_config *vent)
> {
> - struct v4l2_device *v4l2_dev = master_data;
> - struct vimc_platform_data *pdata = comp->platform_data;
> + struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
> struct vimc_sen_device *vsen;
> int ret;
>
> @@ -343,7 +335,7 @@ static int vimc_sen_comp_bind(struct device *comp, struct device *master,
>
> /* Initialize ved and sd */
> ret = vimc_ent_sd_register(&vsen->ved, &vsen->sd, v4l2_dev,
> - pdata->entity_name,
> + vent->name,
> MEDIA_ENT_F_CAM_SENSOR, 1,
> (const unsigned long[1]) {MEDIA_PAD_FL_SOURCE},
> &vimc_sen_int_ops, &vimc_sen_ops);
> @@ -351,8 +343,7 @@ static int vimc_sen_comp_bind(struct device *comp, struct device *master,
> goto err_free_hdl;
>
> vsen->ved.process_frame = vimc_sen_process_frame;
> - dev_set_drvdata(comp, &vsen->ved);
> - vsen->dev = comp;
> + vsen->dev = &vimc->pdev.dev;
>
> /* Initialize the frame format */
> vsen->mbus_format = fmt_default;
> @@ -364,6 +355,7 @@ static int vimc_sen_comp_bind(struct device *comp, struct device *master,
> if (ret)
> goto err_unregister_ent_sd;
>
> + vent->ved = &vsen->ved;
> return 0;
>
> err_unregister_ent_sd:
> @@ -375,44 +367,3 @@ static int vimc_sen_comp_bind(struct device *comp, struct device *master,
>
> return ret;
> }
> -
> -static const struct component_ops vimc_sen_comp_ops = {
> - .bind = vimc_sen_comp_bind,
> - .unbind = vimc_sen_comp_unbind,
> -};
> -
> -static int vimc_sen_probe(struct platform_device *pdev)
> -{
> - return component_add(&pdev->dev, &vimc_sen_comp_ops);
> -}
> -
> -static int vimc_sen_remove(struct platform_device *pdev)
> -{
> - component_del(&pdev->dev, &vimc_sen_comp_ops);
> -
> - return 0;
> -}
> -
> -static const struct platform_device_id vimc_sen_driver_ids[] = {
> - {
> - .name = VIMC_SEN_DRV_NAME,
> - },
> - { }
> -};
> -
> -static struct platform_driver vimc_sen_pdrv = {
> - .probe = vimc_sen_probe,
> - .remove = vimc_sen_remove,
> - .id_table = vimc_sen_driver_ids,
> - .driver = {
> - .name = VIMC_SEN_DRV_NAME,
> - },
> -};
> -
> -module_platform_driver(vimc_sen_pdrv);
> -
> -MODULE_DEVICE_TABLE(platform, vimc_sen_driver_ids);
> -
> -MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Sensor");
> -MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
> -MODULE_LICENSE("GPL");
>