// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * S5P/EXYNOS4 SoC series camera host interface media device driver
 *
 * Copyright (C) 2011 - 2013 Samsung Electronics Co., Ltd.
 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
 */

#include <linux/bug.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/media-device.h>
#include <media/drv-intf/exynos-fimc.h>

#include "media-dev.h"
#include "fimc-core.h"
#include "fimc-is.h"
#include "fimc-lite.h"
#include "mipi-csis.h"

/* Set up image sensor subdev -> FIMC capture node notifications. */
static void __setup_sensor_notification(struct fimc_md *fmd,
                                        struct v4l2_subdev *sensor,
                                        struct v4l2_subdev *fimc_sd)
{
        struct fimc_source_info *src_inf;
        struct fimc_sensor_info *md_si;
        unsigned long flags;

        src_inf = v4l2_get_subdev_hostdata(sensor);
        if (!src_inf || WARN_ON(fmd == NULL))
                return;

        md_si = source_to_sensor_info(src_inf);
        spin_lock_irqsave(&fmd->slock, flags);
        md_si->host = v4l2_get_subdevdata(fimc_sd);
        spin_unlock_irqrestore(&fmd->slock, flags);
}

/**
 * fimc_pipeline_prepare - update pipeline information with subdevice pointers
 * @p: fimc pipeline
 * @me: media entity terminating the pipeline
 *
 * Caller holds the graph mutex.
 */
static void fimc_pipeline_prepare(struct fimc_pipeline *p,
                                        struct media_entity *me)
{
        struct fimc_md *fmd = entity_to_fimc_mdev(me);
        struct v4l2_subdev *sd;
        struct v4l2_subdev *sensor = NULL;
        int i;

        for (i = 0; i < IDX_MAX; i++)
                p->subdevs[i] = NULL;

        while (1) {
                struct media_pad *pad = NULL;

                /* Find remote source pad */
                for (i = 0; i < me->num_pads; i++) {
                        struct media_pad *spad = &me->pads[i];
                        if (!(spad->flags & MEDIA_PAD_FL_SINK))
                                continue;
                        pad = media_entity_remote_pad(spad);
                        if (pad)
                                break;
                }

                if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
                        break;
                sd = media_entity_to_v4l2_subdev(pad->entity);

                switch (sd->grp_id) {
                case GRP_ID_SENSOR:
                        sensor = sd;
                        /* fall through */
                case GRP_ID_FIMC_IS_SENSOR:
                        p->subdevs[IDX_SENSOR] = sd;
                        break;
                case GRP_ID_CSIS:
                        p->subdevs[IDX_CSIS] = sd;
                        break;
                case GRP_ID_FLITE:
                        p->subdevs[IDX_FLITE] = sd;
                        break;
                case GRP_ID_FIMC:
                        p->subdevs[IDX_FIMC] = sd;
                        break;
                case GRP_ID_FIMC_IS:
                        p->subdevs[IDX_IS_ISP] = sd;
                        break;
                default:
                        break;
                }
                me = &sd->entity;
                if (me->num_pads == 1)
                        break;
        }

        if (sensor && p->subdevs[IDX_FIMC])
                __setup_sensor_notification(fmd, sensor, p->subdevs[IDX_FIMC]);
}

/**
 * __subdev_set_power - change power state of a single subdev
 * @sd: subdevice to change power state for
 * @on: 1 to enable power or 0 to disable
 *
 * Return result of s_power subdev operation or -ENXIO if sd argument
 * is NULL. Return 0 if the subdevice does not implement s_power.
 */
static int __subdev_set_power(struct v4l2_subdev *sd, int on)
{
        int *use_count;
        int ret;

        if (sd == NULL)
                return -ENXIO;

        use_count = &sd->entity.use_count;
        if (on && (*use_count)++ > 0)
                return 0;
        else if (!on && (*use_count == 0 || --(*use_count) > 0))
                return 0;
        ret = v4l2_subdev_call(sd, core, s_power, on);

        return ret != -ENOIOCTLCMD ? ret : 0;
}

/**
 * fimc_pipeline_s_power - change power state of all pipeline subdevs
 * @p: fimc device terminating the pipeline
 * @on: true to power on, false to power off
 *
 * Needs to be called with the graph mutex held.
 */
static int fimc_pipeline_s_power(struct fimc_pipeline *p, bool on)
{
        static const u8 seq[2][IDX_MAX - 1] = {
                { IDX_IS_ISP, IDX_SENSOR, IDX_CSIS, IDX_FLITE },
                { IDX_CSIS, IDX_FLITE, IDX_SENSOR, IDX_IS_ISP },
        };
        int i, ret = 0;

        if (p->subdevs[IDX_SENSOR] == NULL)
                return -ENXIO;

        for (i = 0; i < IDX_MAX - 1; i++) {
                unsigned int idx = seq[on][i];

                ret = __subdev_set_power(p->subdevs[idx], on);


                if (ret < 0 && ret != -ENXIO)
                        goto error;
        }
        return 0;
error:
        for (; i >= 0; i--) {
                unsigned int idx = seq[on][i];
                __subdev_set_power(p->subdevs[idx], !on);
        }
        return ret;
}

/**
 * __fimc_pipeline_enable - enable power of all pipeline subdevs
 *                          and the sensor clock
 * @ep: video pipeline structure
 * @fmd: fimc media device
 *
 * Called with the graph mutex held.
 */
static int __fimc_pipeline_enable(struct exynos_media_pipeline *ep,
                                  struct fimc_md *fmd)
{
        struct fimc_pipeline *p = to_fimc_pipeline(ep);
        int ret;

        /* Enable PXLASYNC clock if this pipeline includes FIMC-IS */
        if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP]) {
                ret = clk_prepare_enable(fmd->wbclk[CLK_IDX_WB_B]);
                if (ret < 0)
                        return ret;
        }

        ret = fimc_pipeline_s_power(p, 1);
        if (!ret)
                return 0;

        if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
                clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);

        return ret;
}

/**
 * __fimc_pipeline_open - update the pipeline information, enable power
 *                        of all pipeline subdevs and the sensor clock
 * @ep: fimc device terminating the pipeline
 * @me: media entity to start graph walk with
 * @prepare: true to walk the current pipeline and acquire all subdevs
 *
 * Called with the graph mutex held.
 */
static int __fimc_pipeline_open(struct exynos_media_pipeline *ep,
                                struct media_entity *me, bool prepare)
{
        struct fimc_md *fmd = entity_to_fimc_mdev(me);
        struct fimc_pipeline *p = to_fimc_pipeline(ep);
        struct v4l2_subdev *sd;

        if (WARN_ON(p == NULL || me == NULL))
                return -EINVAL;

        if (prepare)
                fimc_pipeline_prepare(p, me);

        sd = p->subdevs[IDX_SENSOR];
        if (sd == NULL) {
                pr_warn("%s(): No sensor subdev\n", __func__);
                /*
                 * Pipeline open cannot fail so as to make it possible
                 * for the user space to configure the pipeline.
                 */
                return 0;
        }

        return __fimc_pipeline_enable(ep, fmd);
}

/**
 * __fimc_pipeline_close - disable the sensor clock and pipeline power
 * @ep: fimc device terminating the pipeline
 *
 * Disable power of all subdevs and turn the external sensor clock off.
 */
static int __fimc_pipeline_close(struct exynos_media_pipeline *ep)
{
        struct fimc_pipeline *p = to_fimc_pipeline(ep);
        struct v4l2_subdev *sd = p ? p->subdevs[IDX_SENSOR] : NULL;
        struct fimc_md *fmd;
        int ret;

        if (sd == NULL) {
                pr_warn("%s(): No sensor subdev\n", __func__);
                return 0;
        }

        ret = fimc_pipeline_s_power(p, 0);

        fmd = entity_to_fimc_mdev(&sd->entity);

        /* Disable PXLASYNC clock if this pipeline includes FIMC-IS */
        if (!IS_ERR(fmd->wbclk[CLK_IDX_WB_B]) && p->subdevs[IDX_IS_ISP])
                clk_disable_unprepare(fmd->wbclk[CLK_IDX_WB_B]);

        return ret == -ENXIO ? 0 : ret;
}

/**
 * __fimc_pipeline_s_stream - call s_stream() on pipeline subdevs
 * @ep: video pipeline structure
 * @on: passed as the s_stream() callback argument
 */
static int __fimc_pipeline_s_stream(struct exynos_media_pipeline *ep, bool on)
{
        static const u8 seq[2][IDX_MAX] = {
                { IDX_FIMC, IDX_SENSOR, IDX_IS_ISP, IDX_CSIS, IDX_FLITE },
                { IDX_CSIS, IDX_FLITE, IDX_FIMC, IDX_SENSOR, IDX_IS_ISP },
        };
        struct fimc_pipeline *p = to_fimc_pipeline(ep);
        struct fimc_md *fmd = entity_to_fimc_mdev(&p->subdevs[IDX_CSIS]->entity);
        enum fimc_subdev_index sd_id;
        int i, ret = 0;

        if (p->subdevs[IDX_SENSOR] == NULL) {
                if (!fmd->user_subdev_api) {
                        /*
                         * Sensor must be already discovered if we
                         * aren't in the user_subdev_api mode
                         */
                        return -ENODEV;
                }

                /* Get pipeline sink entity */
                if (p->subdevs[IDX_FIMC])
                        sd_id = IDX_FIMC;
                else if (p->subdevs[IDX_IS_ISP])
                        sd_id = IDX_IS_ISP;
                else if (p->subdevs[IDX_FLITE])
                        sd_id = IDX_FLITE;
                else
                        return -ENODEV;

                /*
                 * Sensor could have been linked between open and STREAMON -
                 * check if this is the case.
                 */
                fimc_pipeline_prepare(p, &p->subdevs[sd_id]->entity);

                if (p->subdevs[IDX_SENSOR] == NULL)
                        return -ENODEV;

                ret = __fimc_pipeline_enable(ep, fmd);
                if (ret < 0)
                        return ret;

        }

        for (i = 0; i < IDX_MAX; i++) {
                unsigned int idx = seq[on][i];

                ret = v4l2_subdev_call(p->subdevs[idx], video, s_stream, on);

                if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
                        goto error;
        }

        return 0;
error:
        fimc_pipeline_s_power(p, !on);
        for (; i >= 0; i--) {
                unsigned int idx = seq[on][i];
                v4l2_subdev_call(p->subdevs[idx], video, s_stream, !on);
        }
        return ret;
}

/* Media pipeline operations for the FIMC/FIMC-LITE video device driver */
static const struct exynos_media_pipeline_ops fimc_pipeline_ops = {
        .open           = __fimc_pipeline_open,
        .close          = __fimc_pipeline_close,
        .set_stream     = __fimc_pipeline_s_stream,
};

static struct exynos_media_pipeline *fimc_md_pipeline_create(
                                                struct fimc_md *fmd)
{
        struct fimc_pipeline *p;

        p = kzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
                return NULL;

        list_add_tail(&p->list, &fmd->pipelines);

        p->ep.ops = &fimc_pipeline_ops;
        return &p->ep;
}

static void fimc_md_pipelines_free(struct fimc_md *fmd)
{
        while (!list_empty(&fmd->pipelines)) {
                struct fimc_pipeline *p;

                p = list_entry(fmd->pipelines.next, typeof(*p), list);
                list_del(&p->list);
                kfree(p);
        }
}

/* Parse port node and register as a sub-device any sensor specified there. */
static int fimc_md_parse_port_node(struct fimc_md *fmd,
                                   struct device_node *port,
                                   unsigned int index)
{
        struct fimc_source_info *pd = &fmd->sensor[index].pdata;
        struct device_node *rem, *ep, *np;
        struct v4l2_fwnode_endpoint endpoint = { .bus_type = 0 };
        int ret;

        /* Assume here a port node can have only one endpoint node. */
        ep = of_get_next_child(port, NULL);
        if (!ep)
                return 0;

        ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &endpoint);
        if (ret) {
                of_node_put(ep);
                return ret;
        }

        if (WARN_ON(endpoint.base.port == 0) || index >= FIMC_MAX_SENSORS) {
                of_node_put(ep);
                return -EINVAL;
        }

        pd->mux_id = (endpoint.base.port - 1) & 0x1;

        rem = of_graph_get_remote_port_parent(ep);
        of_node_put(ep);
        if (rem == NULL) {
                v4l2_info(&fmd->v4l2_dev, "Remote device at %pOF not found\n",
                                                        ep);
                return 0;
        }

        if (fimc_input_is_parallel(endpoint.base.port)) {
                if (endpoint.bus_type == V4L2_MBUS_PARALLEL)
                        pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_601;
                else
                        pd->sensor_bus_type = FIMC_BUS_TYPE_ITU_656;
                pd->flags = endpoint.bus.parallel.flags;
        } else if (fimc_input_is_mipi_csi(endpoint.base.port)) {
                /*
                 * MIPI CSI-2: only input mux selection and
                 * the sensor's clock frequency is needed.
                 */
                pd->sensor_bus_type = FIMC_BUS_TYPE_MIPI_CSI2;
        } else {
                v4l2_err(&fmd->v4l2_dev, "Wrong port id (%u) at node %pOF\n",
                         endpoint.base.port, rem);
        }
        /*
         * For FIMC-IS handled sensors, that are placed under i2c-isp device
         * node, FIMC is connected to the FIMC-IS through its ISP Writeback
         * input. Sensors are attached to the FIMC-LITE hostdata interface
         * directly or through MIPI-CSIS, depending on the external media bus
         * used. This needs to be handled in a more reliable way, not by just
         * checking parent's node name.
         */
        np = of_get_parent(rem);

        if (of_node_name_eq(np, "i2c-isp"))
                pd->fimc_bus_type = FIMC_BUS_TYPE_ISP_WRITEBACK;
        else
                pd->fimc_bus_type = pd->sensor_bus_type;
        of_node_put(np);

        if (WARN_ON(index >= ARRAY_SIZE(fmd->sensor))) {
                of_node_put(rem);
                return -EINVAL;
        }

        fmd->sensor[index].asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
        fmd->sensor[index].asd.match.fwnode = of_fwnode_handle(rem);

        ret = v4l2_async_notifier_add_subdev(&fmd->subdev_notifier,
                                             &fmd->sensor[index].asd);
        if (ret) {
                of_node_put(rem);
                return ret;
        }

        fmd->num_sensors++;

        return 0;
}

/* Register all SoC external sub-devices */
static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
{
        struct device_node *parent = fmd->pdev->dev.of_node;
        struct device_node *ports = NULL;
        struct device_node *node;
        int index = 0;
        int ret;

        /*
         * Runtime resume one of the FIMC entities to make sure
         * the sclk_cam clocks are not globally disabled.
         */
        if (!fmd->pmf)
                return -ENXIO;

        ret = pm_runtime_get_sync(fmd->pmf);
        if (ret < 0)
                return ret;

        fmd->num_sensors = 0;

        /* Attach sensors linked to MIPI CSI-2 receivers */
        for_each_available_child_of_node(parent, node) {
                struct device_node *port;

                if (!of_node_name_eq(node, "csis"))
                        continue;
                /* The csis node can have only port subnode. */
                port = of_get_next_child(node, NULL);
                if (!port)
                        continue;

                ret = fimc_md_parse_port_node(fmd, port, index);
                of_node_put(port);
                if (ret < 0) {
                        of_node_put(node);
                        goto cleanup;
                }
                index++;
        }

        /* Attach sensors listed in the parallel-ports node */
        ports = of_get_child_by_name(parent, "parallel-ports");
        if (!ports)
                goto rpm_put;

        for_each_child_of_node(ports, node) {
                ret = fimc_md_parse_port_node(fmd, node, index);
                if (ret < 0) {
                        of_node_put(node);
                        goto cleanup;
                }
                index++;
        }
        of_node_put(ports);

rpm_put:
        pm_runtime_put(fmd->pmf);
        return 0;

cleanup:
        of_node_put(ports);
        v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
        pm_runtime_put(fmd->pmf);
        return ret;
}

static int __of_get_csis_id(struct device_node *np)
{
        u32 reg = 0;

        np = of_get_child_by_name(np, "port");
        if (!np)
                return -EINVAL;
        of_property_read_u32(np, "reg", &reg);
        of_node_put(np);
        return reg - FIMC_INPUT_MIPI_CSI2_0;
}

/*
 * MIPI-CSIS, FIMC and FIMC-LITE platform devices registration.
 */
static int register_fimc_lite_entity(struct fimc_md *fmd,
                                     struct fimc_lite *fimc_lite)
{
        struct v4l2_subdev *sd;
        struct exynos_media_pipeline *ep;
        int ret;

        if (WARN_ON(fimc_lite->index >= FIMC_LITE_MAX_DEVS ||
                    fmd->fimc_lite[fimc_lite->index]))
                return -EBUSY;

        sd = &fimc_lite->subdev;
        sd->grp_id = GRP_ID_FLITE;

        ep = fimc_md_pipeline_create(fmd);
        if (!ep)
                return -ENOMEM;

        v4l2_set_subdev_hostdata(sd, ep);

        ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
        if (!ret)
                fmd->fimc_lite[fimc_lite->index] = fimc_lite;
        else
                v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.LITE%d\n",
                         fimc_lite->index);
        return ret;
}

static int register_fimc_entity(struct fimc_md *fmd, struct fimc_dev *fimc)
{
        struct v4l2_subdev *sd;
        struct exynos_media_pipeline *ep;
        int ret;

        if (WARN_ON(fimc->id >= FIMC_MAX_DEVS || fmd->fimc[fimc->id]))
                return -EBUSY;

        sd = &fimc->vid_cap.subdev;
        sd->grp_id = GRP_ID_FIMC;

        ep = fimc_md_pipeline_create(fmd);
        if (!ep)
                return -ENOMEM;

        v4l2_set_subdev_hostdata(sd, ep);

        ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
        if (!ret) {
                if (!fmd->pmf && fimc->pdev)
                        fmd->pmf = &fimc->pdev->dev;
                fmd->fimc[fimc->id] = fimc;
                fimc->vid_cap.user_subdev_api = fmd->user_subdev_api;
        } else {
                v4l2_err(&fmd->v4l2_dev, "Failed to register FIMC.%d (%d)\n",
                         fimc->id, ret);
        }
        return ret;
}

static int register_csis_entity(struct fimc_md *fmd,
                                struct platform_device *pdev,
                                struct v4l2_subdev *sd)
{
        struct device_node *node = pdev->dev.of_node;
        int id, ret;

        id = node ? __of_get_csis_id(node) : max(0, pdev->id);

        if (WARN_ON(id < 0 || id >= CSIS_MAX_ENTITIES))
                return -ENOENT;

        if (WARN_ON(fmd->csis[id].sd))
                return -EBUSY;

        sd->grp_id = GRP_ID_CSIS;
        ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
        if (!ret)
                fmd->csis[id].sd = sd;
        else
                v4l2_err(&fmd->v4l2_dev,
                         "Failed to register MIPI-CSIS.%d (%d)\n", id, ret);
        return ret;
}

static int register_fimc_is_entity(struct fimc_md *fmd, struct fimc_is *is)
{
        struct v4l2_subdev *sd = &is->isp.subdev;
        struct exynos_media_pipeline *ep;
        int ret;

        /* Allocate pipeline object for the ISP capture video node. */
        ep = fimc_md_pipeline_create(fmd);
        if (!ep)
                return -ENOMEM;

        v4l2_set_subdev_hostdata(sd, ep);

        ret = v4l2_device_register_subdev(&fmd->v4l2_dev, sd);
        if (ret) {
                v4l2_err(&fmd->v4l2_dev,
                         "Failed to register FIMC-ISP (%d)\n", ret);
                return ret;
        }

        fmd->fimc_is = is;
        return 0;
}

static int fimc_md_register_platform_entity(struct fimc_md *fmd,
                                            struct platform_device *pdev,
                                            int plat_entity)
{
        struct device *dev = &pdev->dev;
        int ret = -EPROBE_DEFER;
        void *drvdata;

        /* Lock to ensure dev->driver won't change. */
        device_lock(dev);

        if (!dev->driver || !try_module_get(dev->driver->owner))
                goto dev_unlock;

        drvdata = dev_get_drvdata(dev);
        /* Some subdev didn't probe successfully id drvdata is NULL */
        if (drvdata) {
                switch (plat_entity) {
                case IDX_FIMC:
                        ret = register_fimc_entity(fmd, drvdata);
                        break;
                case IDX_FLITE:
                        ret = register_fimc_lite_entity(fmd, drvdata);
                        break;
                case IDX_CSIS:
                        ret = register_csis_entity(fmd, pdev, drvdata);
                        break;
                case IDX_IS_ISP:
                        ret = register_fimc_is_entity(fmd, drvdata);
                        break;
                default:
                        ret = -ENODEV;
                }
        }

        module_put(dev->driver->owner);
dev_unlock:
        device_unlock(dev);
        if (ret == -EPROBE_DEFER)
                dev_info(&fmd->pdev->dev, "deferring %s device registration\n",
                        dev_name(dev));
        else if (ret < 0)
                dev_err(&fmd->pdev->dev, "%s device registration failed (%d)\n",
                        dev_name(dev), ret);
        return ret;
}

/* Register FIMC, FIMC-LITE and CSIS media entities */
static int fimc_md_register_platform_entities(struct fimc_md *fmd,
                                              struct device_node *parent)
{
        struct device_node *node;
        int ret = 0;

        for_each_available_child_of_node(parent, node) {
                struct platform_device *pdev;
                int plat_entity = -1;

                pdev = of_find_device_by_node(node);
                if (!pdev)
                        continue;

                /* If driver of any entity isn't ready try all again later. */
                if (of_node_name_eq(node, CSIS_OF_NODE_NAME))
                        plat_entity = IDX_CSIS;
                else if (of_node_name_eq(node, FIMC_IS_OF_NODE_NAME))
                        plat_entity = IDX_IS_ISP;
                else if (of_node_name_eq(node, FIMC_LITE_OF_NODE_NAME))
                        plat_entity = IDX_FLITE;
                else if (of_node_name_eq(node, FIMC_OF_NODE_NAME) &&
                         !of_property_read_bool(node, "samsung,lcd-wb"))
                        plat_entity = IDX_FIMC;

                if (plat_entity >= 0)
                        ret = fimc_md_register_platform_entity(fmd, pdev,
                                                        plat_entity);
                put_device(&pdev->dev);
                if (ret < 0) {
                        of_node_put(node);
                        break;
                }
        }

        return ret;
}

static void fimc_md_unregister_entities(struct fimc_md *fmd)
{
        int i;

        for (i = 0; i < FIMC_MAX_DEVS; i++) {
                struct fimc_dev *dev = fmd->fimc[i];
                if (dev == NULL)
                        continue;
                v4l2_device_unregister_subdev(&dev->vid_cap.subdev);
                dev->vid_cap.ve.pipe = NULL;
                fmd->fimc[i] = NULL;
        }
        for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
                struct fimc_lite *dev = fmd->fimc_lite[i];
                if (dev == NULL)
                        continue;
                v4l2_device_unregister_subdev(&dev->subdev);
                dev->ve.pipe = NULL;
                fmd->fimc_lite[i] = NULL;
        }
        for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
                if (fmd->csis[i].sd == NULL)
                        continue;
                v4l2_device_unregister_subdev(fmd->csis[i].sd);
                fmd->csis[i].sd = NULL;
        }

        if (fmd->fimc_is)
                v4l2_device_unregister_subdev(&fmd->fimc_is->isp.subdev);

        v4l2_info(&fmd->v4l2_dev, "Unregistered all entities\n");
}

/**
 * __fimc_md_create_fimc_links - create links to all FIMC entities
 * @fmd: fimc media device
 * @source: the source entity to create links to all fimc entities from
 * @sensor: sensor subdev linked to FIMC[fimc_id] entity, may be null
 * @pad: the source entity pad index
 * @link_mask: bitmask of the fimc devices for which link should be enabled
 */
static int __fimc_md_create_fimc_sink_links(struct fimc_md *fmd,
                                            struct media_entity *source,
                                            struct v4l2_subdev *sensor,
                                            int pad, int link_mask)
{
        struct fimc_source_info *si = NULL;
        struct media_entity *sink;
        unsigned int flags = 0;
        int i, ret = 0;

        if (sensor) {
                si = v4l2_get_subdev_hostdata(sensor);
                /* Skip direct FIMC links in the logical FIMC-IS sensor path */
                if (si && si->fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
                        ret = 1;
        }

        for (i = 0; !ret && i < FIMC_MAX_DEVS; i++) {
                if (!fmd->fimc[i])
                        continue;
                /*
                 * Some FIMC variants are not fitted with camera capture
                 * interface. Skip creating a link from sensor for those.
                 */
                if (!fmd->fimc[i]->variant->has_cam_if)
                        continue;

                flags = ((1 << i) & link_mask) ? MEDIA_LNK_FL_ENABLED : 0;

                sink = &fmd->fimc[i]->vid_cap.subdev.entity;
                ret = media_create_pad_link(source, pad, sink,
                                              FIMC_SD_PAD_SINK_CAM, flags);
                if (ret)
                        return ret;

                /* Notify FIMC capture subdev entity */
                ret = media_entity_call(sink, link_setup, &sink->pads[0],
                                        &source->pads[pad], flags);
                if (ret)
                        break;

                v4l2_info(&fmd->v4l2_dev, "created link [%s] %c> [%s]\n",
                          source->name, flags ? '=' : '-', sink->name);
        }

        for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
                if (!fmd->fimc_lite[i])
                        continue;

                sink = &fmd->fimc_lite[i]->subdev.entity;
                ret = media_create_pad_link(source, pad, sink,
                                               FLITE_SD_PAD_SINK, 0);
                if (ret)
                        return ret;

                /* Notify FIMC-LITE subdev entity */
                ret = media_entity_call(sink, link_setup, &sink->pads[0],
                                        &source->pads[pad], 0);
                if (ret)
                        break;

                v4l2_info(&fmd->v4l2_dev, "created link [%s] -> [%s]\n",
                          source->name, sink->name);
        }
        return 0;
}

/* Create links from FIMC-LITE source pads to other entities */
static int __fimc_md_create_flite_source_links(struct fimc_md *fmd)
{
        struct media_entity *source, *sink;
        int i, ret = 0;

        for (i = 0; i < FIMC_LITE_MAX_DEVS; i++) {
                struct fimc_lite *fimc = fmd->fimc_lite[i];

                if (fimc == NULL)
                        continue;

                source = &fimc->subdev.entity;
                sink = &fimc->ve.vdev.entity;
                /* FIMC-LITE's subdev and video node */
                ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_DMA,
                                               sink, 0, 0);
                if (ret)
                        break;
                /* Link from FIMC-LITE to IS-ISP subdev */
                sink = &fmd->fimc_is->isp.subdev.entity;
                ret = media_create_pad_link(source, FLITE_SD_PAD_SOURCE_ISP,
                                               sink, 0, 0);
                if (ret)
                        break;
        }

        return ret;
}

/* Create FIMC-IS links */
static int __fimc_md_create_fimc_is_links(struct fimc_md *fmd)
{
        struct fimc_isp *isp = &fmd->fimc_is->isp;
        struct media_entity *source, *sink;
        int i, ret;

        source = &isp->subdev.entity;

        for (i = 0; i < FIMC_MAX_DEVS; i++) {
                if (fmd->fimc[i] == NULL)
                        continue;

                /* Link from FIMC-IS-ISP subdev to FIMC */
                sink = &fmd->fimc[i]->vid_cap.subdev.entity;
                ret = media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_FIFO,
                                               sink, FIMC_SD_PAD_SINK_FIFO, 0);
                if (ret)
                        return ret;
        }

        /* Link from FIMC-IS-ISP subdev to fimc-is-isp.capture video node */
        sink = &isp->video_capture.ve.vdev.entity;

        /* Skip this link if the fimc-is-isp video node driver isn't built-in */
        if (sink->num_pads == 0)
                return 0;

        return media_create_pad_link(source, FIMC_ISP_SD_PAD_SRC_DMA,
                                        sink, 0, 0);
}

/**
 * fimc_md_create_links - create default links between registered entities
 * @fmd: fimc media device
 *
 * Parallel interface sensor entities are connected directly to FIMC capture
 * entities. The sensors using MIPI CSIS bus are connected through immutable
 * link with CSI receiver entity specified by mux_id. Any registered CSIS
 * entity has a link to each registered FIMC capture entity. Enabled links
 * are created by default between each subsequent registered sensor and
 * subsequent FIMC capture entity. The number of default active links is
 * determined by the number of available sensors or FIMC entities,
 * whichever is less.
 */
static int fimc_md_create_links(struct fimc_md *fmd)
{
        struct v4l2_subdev *csi_sensors[CSIS_MAX_ENTITIES] = { NULL };
        struct v4l2_subdev *sensor, *csis;
        struct fimc_source_info *pdata;
        struct media_entity *source, *sink;
        int i, pad, fimc_id = 0, ret = 0;
        u32 flags, link_mask = 0;

        for (i = 0; i < fmd->num_sensors; i++) {
                if (fmd->sensor[i].subdev == NULL)
                        continue;

                sensor = fmd->sensor[i].subdev;
                pdata = v4l2_get_subdev_hostdata(sensor);
                if (!pdata)
                        continue;

                source = NULL;

                switch (pdata->sensor_bus_type) {
                case FIMC_BUS_TYPE_MIPI_CSI2:
                        if (WARN(pdata->mux_id >= CSIS_MAX_ENTITIES,
                                "Wrong CSI channel id: %d\n", pdata->mux_id))
                                return -EINVAL;

                        csis = fmd->csis[pdata->mux_id].sd;
                        if (WARN(csis == NULL,
                                 "MIPI-CSI interface specified but s5p-csis module is not loaded!\n"))
                                return -EINVAL;

                        pad = sensor->entity.num_pads - 1;
                        ret = media_create_pad_link(&sensor->entity, pad,
                                              &csis->entity, CSIS_PAD_SINK,
                                              MEDIA_LNK_FL_IMMUTABLE |
                                              MEDIA_LNK_FL_ENABLED);
                        if (ret)
                                return ret;

                        v4l2_info(&fmd->v4l2_dev, "created link [%s] => [%s]\n",
                                  sensor->entity.name, csis->entity.name);

                        source = NULL;
                        csi_sensors[pdata->mux_id] = sensor;
                        break;

                case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
                        source = &sensor->entity;
                        pad = 0;
                        break;

                default:
                        v4l2_err(&fmd->v4l2_dev, "Wrong bus_type: %x\n",
                                 pdata->sensor_bus_type);
                        return -EINVAL;
                }
                if (source == NULL)
                        continue;

                link_mask = 1 << fimc_id++;
                ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
                                                       pad, link_mask);
        }

        for (i = 0; i < CSIS_MAX_ENTITIES; i++) {
                if (fmd->csis[i].sd == NULL)
                        continue;

                source = &fmd->csis[i].sd->entity;
                pad = CSIS_PAD_SOURCE;

                sensor = csi_sensors[i];

                link_mask = 1 << fimc_id++;
                ret = __fimc_md_create_fimc_sink_links(fmd, source, sensor,
                                                       pad, link_mask);
        }

        /* Create immutable links between each FIMC's subdev and video node */
        flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED;
        for (i = 0; i < FIMC_MAX_DEVS; i++) {
                if (!fmd->fimc[i])
                        continue;

                source = &fmd->fimc[i]->vid_cap.subdev.entity;
                sink = &fmd->fimc[i]->vid_cap.ve.vdev.entity;

                ret = media_create_pad_link(source, FIMC_SD_PAD_SOURCE,
                                              sink, 0, flags);
                if (ret)
                        break;
        }

        ret = __fimc_md_create_flite_source_links(fmd);
        if (ret < 0)
                return ret;

        if (fmd->use_isp)
                ret = __fimc_md_create_fimc_is_links(fmd);

        return ret;
}

/*
 * The peripheral sensor and CAM_BLK (PIXELASYNCMx) clocks management.
 */
static void fimc_md_put_clocks(struct fimc_md *fmd)
{
        int i = FIMC_MAX_CAMCLKS;

        while (--i >= 0) {
                if (IS_ERR(fmd->camclk[i].clock))
                        continue;
                clk_put(fmd->camclk[i].clock);
                fmd->camclk[i].clock = ERR_PTR(-EINVAL);
        }

        /* Writeback (PIXELASYNCMx) clocks */
        for (i = 0; i < FIMC_MAX_WBCLKS; i++) {
                if (IS_ERR(fmd->wbclk[i]))
                        continue;
                clk_put(fmd->wbclk[i]);
                fmd->wbclk[i] = ERR_PTR(-EINVAL);
        }
}

static int fimc_md_get_clocks(struct fimc_md *fmd)
{
        struct device *dev = &fmd->pdev->dev;
        char clk_name[32];
        struct clk *clock;
        int i, ret = 0;

        for (i = 0; i < FIMC_MAX_CAMCLKS; i++)
                fmd->camclk[i].clock = ERR_PTR(-EINVAL);

        for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
                snprintf(clk_name, sizeof(clk_name), "sclk_cam%u", i);
                clock = clk_get(dev, clk_name);

                if (IS_ERR(clock)) {
                        dev_err(dev, "Failed to get clock: %s\n", clk_name);
                        ret = PTR_ERR(clock);
                        break;
                }
                fmd->camclk[i].clock = clock;
        }
        if (ret)
                fimc_md_put_clocks(fmd);

        if (!fmd->use_isp)
                return 0;
        /*
         * For now get only PIXELASYNCM1 clock (Writeback B/ISP),
         * leave PIXELASYNCM0 out for the LCD Writeback driver.
         */
        fmd->wbclk[CLK_IDX_WB_A] = ERR_PTR(-EINVAL);

        for (i = CLK_IDX_WB_B; i < FIMC_MAX_WBCLKS; i++) {
                snprintf(clk_name, sizeof(clk_name), "pxl_async%u", i);
                clock = clk_get(dev, clk_name);
                if (IS_ERR(clock)) {
                        v4l2_err(&fmd->v4l2_dev, "Failed to get clock: %s\n",
                                  clk_name);
                        ret = PTR_ERR(clock);
                        break;
                }
                fmd->wbclk[i] = clock;
        }
        if (ret)
                fimc_md_put_clocks(fmd);

        return ret;
}

static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
{
        struct exynos_video_entity *ve;
        struct fimc_pipeline *p;
        struct video_device *vdev;
        int ret;

        vdev = media_entity_to_video_device(entity);
        if (vdev->entity.use_count == 0)
                return 0;

        ve = vdev_to_exynos_video_entity(vdev);
        p = to_fimc_pipeline(ve->pipe);
        /*
         * Nothing to do if we are disabling the pipeline, some link
         * has been disconnected and p->subdevs array is cleared now.
         */
        if (!enable && p->subdevs[IDX_SENSOR] == NULL)
                return 0;

        if (enable)
                ret = __fimc_pipeline_open(ve->pipe, entity, true);
        else
                ret = __fimc_pipeline_close(ve->pipe);

        if (ret == 0 && !enable)
                memset(p->subdevs, 0, sizeof(p->subdevs));

        return ret;
}

/* Locking: called with entity->graph_obj.mdev->graph_mutex mutex held. */
static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable,
                                      struct media_graph *graph)
{
        struct media_entity *entity_err = entity;
        int ret;

        /*
         * Walk current graph and call the pipeline open/close routine for each
         * opened video node that belongs to the graph of entities connected
         * through active links. This is needed as we cannot power on/off the
         * subdevs in random order.
         */
        media_graph_walk_start(graph, entity);

        while ((entity = media_graph_walk_next(graph))) {
                if (!is_media_entity_v4l2_video_device(entity))
                        continue;

                ret  = __fimc_md_modify_pipeline(entity, enable);

                if (ret < 0)
                        goto err;
        }

        return 0;

err:
        media_graph_walk_start(graph, entity_err);

        while ((entity_err = media_graph_walk_next(graph))) {
                if (!is_media_entity_v4l2_video_device(entity_err))
                        continue;

                __fimc_md_modify_pipeline(entity_err, !enable);

                if (entity_err == entity)
                        break;
        }

        return ret;
}

static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
                                unsigned int notification)
{
        struct media_graph *graph =
                &container_of(link->graph_obj.mdev, struct fimc_md,
                              media_dev)->link_setup_graph;
        struct media_entity *sink = link->sink->entity;
        int ret = 0;

        /* Before link disconnection */
        if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
                ret = media_graph_walk_init(graph,
                                                   link->graph_obj.mdev);
                if (ret)
                        return ret;
                if (!(flags & MEDIA_LNK_FL_ENABLED))
                        ret = __fimc_md_modify_pipelines(sink, false, graph);
#if 0
                else
                        /* TODO: Link state change validation */
#endif
        /* After link activation */
        } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH) {
                if (link->flags & MEDIA_LNK_FL_ENABLED)
                        ret = __fimc_md_modify_pipelines(sink, true, graph);
                media_graph_walk_cleanup(graph);
        }

        return ret ? -EPIPE : 0;
}

static const struct media_device_ops fimc_md_ops = {
        .link_notify = fimc_md_link_notify,
};

static ssize_t fimc_md_sysfs_show(struct device *dev,
                                  struct device_attribute *attr, char *buf)
{
        struct fimc_md *fmd = dev_get_drvdata(dev);

        if (fmd->user_subdev_api)
                return strscpy(buf, "Sub-device API (sub-dev)\n", PAGE_SIZE);

        return strscpy(buf, "V4L2 video node only API (vid-dev)\n", PAGE_SIZE);
}

static ssize_t fimc_md_sysfs_store(struct device *dev,
                                   struct device_attribute *attr,
                                   const char *buf, size_t count)
{
        struct fimc_md *fmd = dev_get_drvdata(dev);
        bool subdev_api;
        int i;

        if (!strcmp(buf, "vid-dev\n"))
                subdev_api = false;
        else if (!strcmp(buf, "sub-dev\n"))
                subdev_api = true;
        else
                return count;

        fmd->user_subdev_api = subdev_api;
        for (i = 0; i < FIMC_MAX_DEVS; i++)
                if (fmd->fimc[i])
                        fmd->fimc[i]->vid_cap.user_subdev_api = subdev_api;
        return count;
}
/*
 * This device attribute is to select video pipeline configuration method.
 * There are following valid values:
 *  vid-dev - for V4L2 video node API only, subdevice will be configured
 *  by the host driver.
 *  sub-dev - for media controller API, subdevs must be configured in user
 *  space before starting streaming.
 */
static DEVICE_ATTR(subdev_conf_mode, S_IWUSR | S_IRUGO,
                   fimc_md_sysfs_show, fimc_md_sysfs_store);

static int fimc_md_get_pinctrl(struct fimc_md *fmd)
{
        struct device *dev = &fmd->pdev->dev;
        struct fimc_pinctrl *pctl = &fmd->pinctl;

        pctl->pinctrl = devm_pinctrl_get(dev);
        if (IS_ERR(pctl->pinctrl))
                return PTR_ERR(pctl->pinctrl);

        pctl->state_default = pinctrl_lookup_state(pctl->pinctrl,
                                        PINCTRL_STATE_DEFAULT);
        if (IS_ERR(pctl->state_default))
                return PTR_ERR(pctl->state_default);

        pctl->state_idle = pinctrl_lookup_state(pctl->pinctrl,
                                        PINCTRL_STATE_IDLE);
        if (IS_ERR(pctl->state_idle))
                return PTR_ERR(pctl->state_idle);

        return 0;
}

static int cam_clk_prepare(struct clk_hw *hw)
{
        struct cam_clk *camclk = to_cam_clk(hw);
        int ret;

        if (camclk->fmd->pmf == NULL)
                return -ENODEV;

        ret = pm_runtime_get_sync(camclk->fmd->pmf);
        return ret < 0 ? ret : 0;
}

static void cam_clk_unprepare(struct clk_hw *hw)
{
        struct cam_clk *camclk = to_cam_clk(hw);

        if (camclk->fmd->pmf == NULL)
                return;

        pm_runtime_put_sync(camclk->fmd->pmf);
}

static const struct clk_ops cam_clk_ops = {
        .prepare = cam_clk_prepare,
        .unprepare = cam_clk_unprepare,
};

static void fimc_md_unregister_clk_provider(struct fimc_md *fmd)
{
        struct cam_clk_provider *cp = &fmd->clk_provider;
        unsigned int i;

        if (cp->of_node)
                of_clk_del_provider(cp->of_node);

        for (i = 0; i < cp->num_clocks; i++)
                clk_unregister(cp->clks[i]);
}

static int fimc_md_register_clk_provider(struct fimc_md *fmd)
{
        struct cam_clk_provider *cp = &fmd->clk_provider;
        struct device *dev = &fmd->pdev->dev;
        int i, ret;

        for (i = 0; i < FIMC_MAX_CAMCLKS; i++) {
                struct cam_clk *camclk = &cp->camclk[i];
                struct clk_init_data init;
                const char *p_name;

                ret = of_property_read_string_index(dev->of_node,
                                        "clock-output-names", i, &init.name);
                if (ret < 0)
                        break;

                p_name = __clk_get_name(fmd->camclk[i].clock);

                /* It's safe since clk_register() will duplicate the string. */
                init.parent_names = &p_name;
                init.num_parents = 1;
                init.ops = &cam_clk_ops;
                init.flags = CLK_SET_RATE_PARENT;
                camclk->hw.init = &init;
                camclk->fmd = fmd;

                cp->clks[i] = clk_register(NULL, &camclk->hw);
                if (IS_ERR(cp->clks[i])) {
                        dev_err(dev, "failed to register clock: %s (%ld)\n",
                                        init.name, PTR_ERR(cp->clks[i]));
                        ret = PTR_ERR(cp->clks[i]);
                        goto err;
                }
                cp->num_clocks++;
        }

        if (cp->num_clocks == 0) {
                dev_warn(dev, "clk provider not registered\n");
                return 0;
        }

        cp->clk_data.clks = cp->clks;
        cp->clk_data.clk_num = cp->num_clocks;
        cp->of_node = dev->of_node;
        ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
                                  &cp->clk_data);
        if (ret == 0)
                return 0;
err:
        fimc_md_unregister_clk_provider(fmd);
        return ret;
}

static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
                                 struct v4l2_subdev *subdev,
                                 struct v4l2_async_subdev *asd)
{
        struct fimc_md *fmd = notifier_to_fimc_md(notifier);
        struct fimc_sensor_info *si = NULL;
        int i;

        /* Find platform data for this sensor subdev */
        for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
                if (fmd->sensor[i].asd.match.fwnode ==
                    of_fwnode_handle(subdev->dev->of_node))
                        si = &fmd->sensor[i];

        if (si == NULL)
                return -EINVAL;

        v4l2_set_subdev_hostdata(subdev, &si->pdata);

        if (si->pdata.fimc_bus_type == FIMC_BUS_TYPE_ISP_WRITEBACK)
                subdev->grp_id = GRP_ID_FIMC_IS_SENSOR;
        else
                subdev->grp_id = GRP_ID_SENSOR;

        si->subdev = subdev;

        v4l2_info(&fmd->v4l2_dev, "Registered sensor subdevice: %s (%d)\n",
                  subdev->name, fmd->num_sensors);

        fmd->num_sensors++;

        return 0;
}

static int subdev_notifier_complete(struct v4l2_async_notifier *notifier)
{
        struct fimc_md *fmd = notifier_to_fimc_md(notifier);
        int ret;

        mutex_lock(&fmd->media_dev.graph_mutex);

        ret = fimc_md_create_links(fmd);
        if (ret < 0)
                goto unlock;

        ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev);
unlock:
        mutex_unlock(&fmd->media_dev.graph_mutex);
        if (ret < 0)
                return ret;

        return media_device_register(&fmd->media_dev);
}

static const struct v4l2_async_notifier_operations subdev_notifier_ops = {
        .bound = subdev_notifier_bound,
        .complete = subdev_notifier_complete,
};

static int fimc_md_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct v4l2_device *v4l2_dev;
        struct fimc_md *fmd;
        int ret;

        fmd = devm_kzalloc(dev, sizeof(*fmd), GFP_KERNEL);
        if (!fmd)
                return -ENOMEM;

        spin_lock_init(&fmd->slock);
        INIT_LIST_HEAD(&fmd->pipelines);
        fmd->pdev = pdev;

        strscpy(fmd->media_dev.model, "Samsung S5P FIMC",
                sizeof(fmd->media_dev.model));
        fmd->media_dev.ops = &fimc_md_ops;
        fmd->media_dev.dev = dev;

        v4l2_dev = &fmd->v4l2_dev;
        v4l2_dev->mdev = &fmd->media_dev;
        v4l2_dev->notify = fimc_sensor_notify;
        strscpy(v4l2_dev->name, "s5p-fimc-md", sizeof(v4l2_dev->name));

        fmd->use_isp = fimc_md_is_isp_available(dev->of_node);
        fmd->user_subdev_api = true;

        media_device_init(&fmd->media_dev);

        ret = v4l2_device_register(dev, &fmd->v4l2_dev);
        if (ret < 0) {
                v4l2_err(v4l2_dev, "Failed to register v4l2_device: %d\n", ret);
                goto err_md;
        }

        ret = fimc_md_get_clocks(fmd);
        if (ret)
                goto err_v4l2dev;

        ret = fimc_md_get_pinctrl(fmd);
        if (ret < 0) {
                if (ret != EPROBE_DEFER)
                        dev_err(dev, "Failed to get pinctrl: %d\n", ret);
                goto err_clk;
        }

        platform_set_drvdata(pdev, fmd);

        v4l2_async_notifier_init(&fmd->subdev_notifier);

        ret = fimc_md_register_platform_entities(fmd, dev->of_node);
        if (ret)
                goto err_clk;

        ret = fimc_md_register_sensor_entities(fmd);
        if (ret)
                goto err_m_ent;

        ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
        if (ret)
                goto err_cleanup;
        /*
         * FIMC platform devices need to be registered before the sclk_cam
         * clocks provider, as one of these devices needs to be activated
         * to enable the clock.
         */
        ret = fimc_md_register_clk_provider(fmd);
        if (ret < 0) {
                v4l2_err(v4l2_dev, "clock provider registration failed\n");
                goto err_attr;
        }

        if (fmd->num_sensors > 0) {
                fmd->subdev_notifier.ops = &subdev_notifier_ops;
                fmd->num_sensors = 0;

                ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
                                                &fmd->subdev_notifier);
                if (ret)
                        goto err_clk_p;
        }

        return 0;

err_clk_p:
        fimc_md_unregister_clk_provider(fmd);
err_attr:
        device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
err_cleanup:
        v4l2_async_notifier_cleanup(&fmd->subdev_notifier);
err_m_ent:
        fimc_md_unregister_entities(fmd);
err_clk:
        fimc_md_put_clocks(fmd);
err_v4l2dev:
        v4l2_device_unregister(&fmd->v4l2_dev);
err_md:
        media_device_cleanup(&fmd->media_dev);
        return ret;
}

static int fimc_md_remove(struct platform_device *pdev)
{
        struct fimc_md *fmd = platform_get_drvdata(pdev);

        if (!fmd)
                return 0;

        fimc_md_unregister_clk_provider(fmd);
        v4l2_async_notifier_unregister(&fmd->subdev_notifier);
        v4l2_async_notifier_cleanup(&fmd->subdev_notifier);

        v4l2_device_unregister(&fmd->v4l2_dev);
        device_remove_file(&pdev->dev, &dev_attr_subdev_conf_mode);
        fimc_md_unregister_entities(fmd);
        fimc_md_pipelines_free(fmd);
        media_device_unregister(&fmd->media_dev);
        media_device_cleanup(&fmd->media_dev);
        fimc_md_put_clocks(fmd);

        return 0;
}

static const struct platform_device_id fimc_driver_ids[] __always_unused = {
        { .name = "s5p-fimc-md" },
        { },
};
MODULE_DEVICE_TABLE(platform, fimc_driver_ids);

static const struct of_device_id fimc_md_of_match[] = {
        { .compatible = "samsung,fimc" },
        { },
};
MODULE_DEVICE_TABLE(of, fimc_md_of_match);

static struct platform_driver fimc_md_driver = {
        .probe          = fimc_md_probe,
        .remove         = fimc_md_remove,
        .driver = {
                .of_match_table = of_match_ptr(fimc_md_of_match),
                .name           = "s5p-fimc-md",
        }
};

static int __init fimc_md_init(void)
{
        int ret;

        request_module("s5p-csis");
        ret = fimc_register_driver();
        if (ret)
                return ret;

        return platform_driver_register(&fimc_md_driver);
}

static void __exit fimc_md_exit(void)
{
        platform_driver_unregister(&fimc_md_driver);
        fimc_unregister_driver();
}

module_init(fimc_md_init);
module_exit(fimc_md_exit);

MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_DESCRIPTION("S5P FIMC camera host interface/video postprocessor driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("2.0.1");