fimc-capture.c

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/*
 * Samsung S5P/EXYNOS4 SoC series camera interface (camera capture) driver
 *
 * Copyright (C) 2010 - 2012 Samsung Electronics Co., Ltd.
 * Sylwester Nawrocki <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/pm_runtime.h>
#include <linux/list.h>
#include <linux/slab.h>

#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mem2mem.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>

#include "fimc-mdevice.h"
#include "fimc-core.h"
#include "fimc-reg.h"

static int fimc_capture_hw_init(struct fimc_dev *fimc)
{
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct fimc_pipeline *p = &fimc->pipeline;
    struct fimc_sensor_info *sensor;
    unsigned long flags;
    int ret = 0;

    if (p->subdevs[IDX_SENSOR] == NULL || ctx == NULL)
        return -ENXIO;
    if (ctx->s_frame.fmt == NULL)
        return -EINVAL;

    sensor = v4l2_get_subdev_hostdata(p->subdevs[IDX_SENSOR]);

    spin_lock_irqsave(&fimc->slock, flags);
    fimc_prepare_dma_offset(ctx, &ctx->d_frame);
    fimc_set_yuv_order(ctx);

    fimc_hw_set_camera_polarity(fimc, &sensor->pdata);
    fimc_hw_set_camera_type(fimc, &sensor->pdata);
    fimc_hw_set_camera_source(fimc, &sensor->pdata);
    fimc_hw_set_camera_offset(fimc, &ctx->s_frame);

    ret = fimc_set_scaler_info(ctx);
    if (!ret) {
        fimc_hw_set_input_path(ctx);
        fimc_hw_set_prescaler(ctx);
        fimc_hw_set_mainscaler(ctx);
        fimc_hw_set_target_format(ctx);
        fimc_hw_set_rotation(ctx);
        fimc_hw_set_effect(ctx);
        fimc_hw_set_output_path(ctx);
        fimc_hw_set_out_dma(ctx);
        if (fimc->variant->has_alpha)
            fimc_hw_set_rgb_alpha(ctx);
        clear_bit(ST_CAPT_APPLY_CFG, &fimc->state);
    }
    spin_unlock_irqrestore(&fimc->slock, flags);
    return ret;
}

/*
 * Reinitialize the driver so it is ready to start the streaming again.
 * Set fimc->state to indicate stream off and the hardware shut down state.
 * If not suspending (@suspend is false), return any buffers to videobuf2.
 * Otherwise put any owned buffers onto the pending buffers queue, so they
 * can be re-spun when the device is being resumed. Also perform FIMC
 * software reset and disable streaming on the whole pipeline if required.
 */
static int fimc_capture_state_cleanup(struct fimc_dev *fimc, bool suspend)
{
    struct fimc_vid_cap *cap = &fimc->vid_cap;
    struct fimc_vid_buffer *buf;
    unsigned long flags;
    bool streaming;

    spin_lock_irqsave(&fimc->slock, flags);
    streaming = fimc->state & (1 << ST_CAPT_ISP_STREAM);

    fimc->state &= ~(1 << ST_CAPT_RUN | 1 << ST_CAPT_SHUT |
             1 << ST_CAPT_STREAM | 1 << ST_CAPT_ISP_STREAM);
    if (suspend)
        fimc->state |= (1 << ST_CAPT_SUSPENDED);
    else
        fimc->state &= ~(1 << ST_CAPT_PEND | 1 << ST_CAPT_SUSPENDED);

    /* Release unused buffers */
    while (!suspend && !list_empty(&cap->pending_buf_q)) {
        buf = fimc_pending_queue_pop(cap);
        vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
    }
    /* If suspending put unused buffers onto pending queue */
    while (!list_empty(&cap->active_buf_q)) {
        buf = fimc_active_queue_pop(cap);
        if (suspend)
            fimc_pending_queue_add(cap, buf);
        else
            vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
    }

    fimc_hw_reset(fimc);
    cap->buf_index = 0;

    spin_unlock_irqrestore(&fimc->slock, flags);

    if (streaming)
        return fimc_pipeline_call(fimc, set_stream,
                      &fimc->pipeline, 0);
    else
        return 0;
}

static int fimc_stop_capture(struct fimc_dev *fimc, bool suspend)
{
    unsigned long flags;

    if (!fimc_capture_active(fimc))
        return 0;

    spin_lock_irqsave(&fimc->slock, flags);
    set_bit(ST_CAPT_SHUT, &fimc->state);
    fimc_deactivate_capture(fimc);
    spin_unlock_irqrestore(&fimc->slock, flags);

    wait_event_timeout(fimc->irq_queue,
               !test_bit(ST_CAPT_SHUT, &fimc->state),
               (2*HZ/10)); /* 200 ms */

    return fimc_capture_state_cleanup(fimc, suspend);
}

static int fimc_capture_config_update(struct fimc_ctx *ctx)
{
    struct fimc_dev *fimc = ctx->fimc_dev;
    int ret;

    fimc_hw_set_camera_offset(fimc, &ctx->s_frame);

    ret = fimc_set_scaler_info(ctx);
    if (ret)
        return ret;

    fimc_hw_set_prescaler(ctx);
    fimc_hw_set_mainscaler(ctx);
    fimc_hw_set_target_format(ctx);
    fimc_hw_set_rotation(ctx);
    fimc_hw_set_effect(ctx);
    fimc_prepare_dma_offset(ctx, &ctx->d_frame);
    fimc_hw_set_out_dma(ctx);
    if (fimc->variant->has_alpha)
        fimc_hw_set_rgb_alpha(ctx);

    clear_bit(ST_CAPT_APPLY_CFG, &fimc->state);
    return ret;
}

void fimc_capture_irq_handler(struct fimc_dev *fimc, int deq_buf)
{
    struct v4l2_subdev *csis = fimc->pipeline.subdevs[IDX_CSIS];
    struct fimc_vid_cap *cap = &fimc->vid_cap;
    struct fimc_frame *f = &cap->ctx->d_frame;
    struct fimc_vid_buffer *v_buf;
    struct timeval *tv;
    struct timespec ts;

    if (test_and_clear_bit(ST_CAPT_SHUT, &fimc->state)) {
        wake_up(&fimc->irq_queue);
        goto done;
    }

    if (!list_empty(&cap->active_buf_q) &&
        test_bit(ST_CAPT_RUN, &fimc->state) && deq_buf) {
        ktime_get_real_ts(&ts);

        v_buf = fimc_active_queue_pop(cap);

        tv = &v_buf->vb.v4l2_buf.timestamp;
        tv->tv_sec = ts.tv_sec;
        tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
        v_buf->vb.v4l2_buf.sequence = cap->frame_count++;

        vb2_buffer_done(&v_buf->vb, VB2_BUF_STATE_DONE);
    }

    if (!list_empty(&cap->pending_buf_q)) {

        v_buf = fimc_pending_queue_pop(cap);
        fimc_hw_set_output_addr(fimc, &v_buf->paddr, cap->buf_index);
        v_buf->index = cap->buf_index;

        /* Move the buffer to the capture active queue */
        fimc_active_queue_add(cap, v_buf);

        dbg("next frame: %d, done frame: %d",
            fimc_hw_get_frame_index(fimc), v_buf->index);

        if (++cap->buf_index >= FIMC_MAX_OUT_BUFS)
            cap->buf_index = 0;
    }
    /*
     * Set up a buffer at MIPI-CSIS if current image format
     * requires the frame embedded data capture.
     */
    if (f->fmt->mdataplanes && !list_empty(&cap->active_buf_q)) {
        unsigned int plane = ffs(f->fmt->mdataplanes) - 1;
        unsigned int size = f->payload[plane];
        s32 index = fimc_hw_get_frame_index(fimc);
        void *vaddr;

        list_for_each_entry(v_buf, &cap->active_buf_q, list) {
            if (v_buf->index != index)
                continue;
            vaddr = vb2_plane_vaddr(&v_buf->vb, plane);
            v4l2_subdev_call(csis, video, s_rx_buffer,
                     vaddr, &size);
            break;
        }
    }

    if (cap->active_buf_cnt == 0) {
        if (deq_buf)
            clear_bit(ST_CAPT_RUN, &fimc->state);

        if (++cap->buf_index >= FIMC_MAX_OUT_BUFS)
            cap->buf_index = 0;
    } else {
        set_bit(ST_CAPT_RUN, &fimc->state);
    }

    if (test_bit(ST_CAPT_APPLY_CFG, &fimc->state))
        fimc_capture_config_update(cap->ctx);
done:
    if (cap->active_buf_cnt == 1) {
        fimc_deactivate_capture(fimc);
        clear_bit(ST_CAPT_STREAM, &fimc->state);
    }

    dbg("frame: %d, active_buf_cnt: %d",
        fimc_hw_get_frame_index(fimc), cap->active_buf_cnt);
}


static int start_streaming(struct vb2_queue *q, unsigned int count)
{
    struct fimc_ctx *ctx = q->drv_priv;
    struct fimc_dev *fimc = ctx->fimc_dev;
    struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
    int min_bufs;
    int ret;

    vid_cap->frame_count = 0;

    ret = fimc_capture_hw_init(fimc);
    if (ret) {
        fimc_capture_state_cleanup(fimc, false);
        return ret;
    }

    set_bit(ST_CAPT_PEND, &fimc->state);

    min_bufs = fimc->vid_cap.reqbufs_count > 1 ? 2 : 1;

    if (vid_cap->active_buf_cnt >= min_bufs &&
        !test_and_set_bit(ST_CAPT_STREAM, &fimc->state)) {
        fimc_activate_capture(ctx);

        if (!test_and_set_bit(ST_CAPT_ISP_STREAM, &fimc->state))
            fimc_pipeline_call(fimc, set_stream,
                       &fimc->pipeline, 1);
    }

    return 0;
}

static int stop_streaming(struct vb2_queue *q)
{
    struct fimc_ctx *ctx = q->drv_priv;
    struct fimc_dev *fimc = ctx->fimc_dev;

    if (!fimc_capture_active(fimc))
        return -EINVAL;

    return fimc_stop_capture(fimc, false);
}

int fimc_capture_suspend(struct fimc_dev *fimc)
{
    bool suspend = fimc_capture_busy(fimc);

    int ret = fimc_stop_capture(fimc, suspend);
    if (ret)
        return ret;
    return fimc_pipeline_call(fimc, close, &fimc->pipeline);
}

static void buffer_queue(struct vb2_buffer *vb);

int fimc_capture_resume(struct fimc_dev *fimc)
{
    struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
    struct fimc_vid_buffer *buf;
    int i;

    if (!test_and_clear_bit(ST_CAPT_SUSPENDED, &fimc->state))
        return 0;

    INIT_LIST_HEAD(&fimc->vid_cap.active_buf_q);
    vid_cap->buf_index = 0;
    fimc_pipeline_call(fimc, open, &fimc->pipeline,
               &vid_cap->vfd.entity, false);
    fimc_capture_hw_init(fimc);

    clear_bit(ST_CAPT_SUSPENDED, &fimc->state);

    for (i = 0; i < vid_cap->reqbufs_count; i++) {
        if (list_empty(&vid_cap->pending_buf_q))
            break;
        buf = fimc_pending_queue_pop(vid_cap);
        buffer_queue(&buf->vb);
    }
    return 0;

}

static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *pfmt,
               unsigned int *num_buffers, unsigned int *num_planes,
               unsigned int sizes[], void *allocators[])
{
    const struct v4l2_pix_format_mplane *pixm = NULL;
    struct fimc_ctx *ctx = vq->drv_priv;
    struct fimc_frame *frame = &ctx->d_frame;
    struct fimc_fmt *fmt = frame->fmt;
    unsigned long wh;
    int i;

    if (pfmt) {
        pixm = &pfmt->fmt.pix_mp;
        fmt = fimc_find_format(&pixm->pixelformat, NULL,
                       FMT_FLAGS_CAM | FMT_FLAGS_M2M, -1);
        wh = pixm->width * pixm->height;
    } else {
        wh = frame->f_width * frame->f_height;
    }

    if (fmt == NULL)
        return -EINVAL;

    *num_planes = fmt->memplanes;

    for (i = 0; i < fmt->memplanes; i++) {
        unsigned int size = (wh * fmt->depth[i]) / 8;
        if (pixm)
            sizes[i] = max(size, pixm->plane_fmt[i].sizeimage);
        else if (fimc_fmt_is_user_defined(fmt->color))
            sizes[i] = frame->payload[i];
        else
            sizes[i] = max_t(u32, size, frame->payload[i]);

        allocators[i] = ctx->fimc_dev->alloc_ctx;
    }

    return 0;
}

static int buffer_prepare(struct vb2_buffer *vb)
{
    struct vb2_queue *vq = vb->vb2_queue;
    struct fimc_ctx *ctx = vq->drv_priv;
    int i;

    if (ctx->d_frame.fmt == NULL)
        return -EINVAL;

    for (i = 0; i < ctx->d_frame.fmt->memplanes; i++) {
        unsigned long size = ctx->d_frame.payload[i];

        if (vb2_plane_size(vb, i) < size) {
            v4l2_err(&ctx->fimc_dev->vid_cap.vfd,
                 "User buffer too small (%ld < %ld)\n",
                 vb2_plane_size(vb, i), size);
            return -EINVAL;
        }
        vb2_set_plane_payload(vb, i, size);
    }

    return 0;
}

static void buffer_queue(struct vb2_buffer *vb)
{
    struct fimc_vid_buffer *buf
        = container_of(vb, struct fimc_vid_buffer, vb);
    struct fimc_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
    struct fimc_dev *fimc = ctx->fimc_dev;
    struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
    unsigned long flags;
    int min_bufs;

    spin_lock_irqsave(&fimc->slock, flags);
    fimc_prepare_addr(ctx, &buf->vb, &ctx->d_frame, &buf->paddr);

    if (!test_bit(ST_CAPT_SUSPENDED, &fimc->state) &&
        !test_bit(ST_CAPT_STREAM, &fimc->state) &&
        vid_cap->active_buf_cnt < FIMC_MAX_OUT_BUFS) {
        /* Setup the buffer directly for processing. */
        int buf_id = (vid_cap->reqbufs_count == 1) ? -1 :
                vid_cap->buf_index;

        fimc_hw_set_output_addr(fimc, &buf->paddr, buf_id);
        buf->index = vid_cap->buf_index;
        fimc_active_queue_add(vid_cap, buf);

        if (++vid_cap->buf_index >= FIMC_MAX_OUT_BUFS)
            vid_cap->buf_index = 0;
    } else {
        fimc_pending_queue_add(vid_cap, buf);
    }

    min_bufs = vid_cap->reqbufs_count > 1 ? 2 : 1;


    if (vb2_is_streaming(&vid_cap->vbq) &&
        vid_cap->active_buf_cnt >= min_bufs &&
        !test_and_set_bit(ST_CAPT_STREAM, &fimc->state)) {
        fimc_activate_capture(ctx);
        spin_unlock_irqrestore(&fimc->slock, flags);

        if (!test_and_set_bit(ST_CAPT_ISP_STREAM, &fimc->state))
            fimc_pipeline_call(fimc, set_stream,
                       &fimc->pipeline, 1);
        return;
    }
    spin_unlock_irqrestore(&fimc->slock, flags);
}

static void fimc_lock(struct vb2_queue *vq)
{
    struct fimc_ctx *ctx = vb2_get_drv_priv(vq);
    mutex_lock(&ctx->fimc_dev->lock);
}

static void fimc_unlock(struct vb2_queue *vq)
{
    struct fimc_ctx *ctx = vb2_get_drv_priv(vq);
    mutex_unlock(&ctx->fimc_dev->lock);
}

static struct vb2_ops fimc_capture_qops = {
    .queue_setup        = queue_setup,
    .buf_prepare        = buffer_prepare,
    .buf_queue      = buffer_queue,
    .wait_prepare       = fimc_unlock,
    .wait_finish        = fimc_lock,
    .start_streaming    = start_streaming,
    .stop_streaming     = stop_streaming,
};

int fimc_capture_ctrls_create(struct fimc_dev *fimc)
{
    struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
    int ret;

    if (WARN_ON(vid_cap->ctx == NULL))
        return -ENXIO;
    if (vid_cap->ctx->ctrls.ready)
        return 0;

    ret = fimc_ctrls_create(vid_cap->ctx);
    if (ret || vid_cap->user_subdev_api || !vid_cap->ctx->ctrls.ready)
        return ret;

    return v4l2_ctrl_add_handler(&vid_cap->ctx->ctrls.handler,
            fimc->pipeline.subdevs[IDX_SENSOR]->ctrl_handler, NULL);
}

static int fimc_capture_set_default_format(struct fimc_dev *fimc);

static int fimc_capture_open(struct file *file)
{
    struct fimc_dev *fimc = video_drvdata(file);
    int ret = -EBUSY;

    dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);

    if (mutex_lock_interruptible(&fimc->lock))
        return -ERESTARTSYS;

    if (fimc_m2m_active(fimc))
        goto unlock;

    set_bit(ST_CAPT_BUSY, &fimc->state);
    ret = pm_runtime_get_sync(&fimc->pdev->dev);
    if (ret < 0)
        goto unlock;

    ret = v4l2_fh_open(file);
    if (ret) {
        pm_runtime_put(&fimc->pdev->dev);
        goto unlock;
    }

    if (++fimc->vid_cap.refcnt == 1) {
        ret = fimc_pipeline_call(fimc, open, &fimc->pipeline,
                     &fimc->vid_cap.vfd.entity, true);

        if (!ret && !fimc->vid_cap.user_subdev_api)
            ret = fimc_capture_set_default_format(fimc);

        if (!ret)
            ret = fimc_capture_ctrls_create(fimc);

        if (ret < 0) {
            clear_bit(ST_CAPT_BUSY, &fimc->state);
            pm_runtime_put_sync(&fimc->pdev->dev);
            fimc->vid_cap.refcnt--;
            v4l2_fh_release(file);
        }
    }
unlock:
    mutex_unlock(&fimc->lock);
    return ret;
}

static int fimc_capture_close(struct file *file)
{
    struct fimc_dev *fimc = video_drvdata(file);
    int ret;

    dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);

    mutex_lock(&fimc->lock);

    if (--fimc->vid_cap.refcnt == 0) {
        clear_bit(ST_CAPT_BUSY, &fimc->state);
        fimc_stop_capture(fimc, false);
        fimc_pipeline_call(fimc, close, &fimc->pipeline);
        clear_bit(ST_CAPT_SUSPENDED, &fimc->state);
    }

    pm_runtime_put(&fimc->pdev->dev);

    if (fimc->vid_cap.refcnt == 0) {
        vb2_queue_release(&fimc->vid_cap.vbq);
        fimc_ctrls_delete(fimc->vid_cap.ctx);
    }

    ret = v4l2_fh_release(file);

    mutex_unlock(&fimc->lock);
    return ret;
}

static unsigned int fimc_capture_poll(struct file *file,
                      struct poll_table_struct *wait)
{
    struct fimc_dev *fimc = video_drvdata(file);
    int ret;

    if (mutex_lock_interruptible(&fimc->lock))
        return POLL_ERR;

    ret = vb2_poll(&fimc->vid_cap.vbq, file, wait);
    mutex_unlock(&fimc->lock);

    return ret;
}

static int fimc_capture_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct fimc_dev *fimc = video_drvdata(file);
    int ret;

    if (mutex_lock_interruptible(&fimc->lock))
        return -ERESTARTSYS;

    ret = vb2_mmap(&fimc->vid_cap.vbq, vma);
    mutex_unlock(&fimc->lock);

    return ret;
}

static const struct v4l2_file_operations fimc_capture_fops = {
    .owner      = THIS_MODULE,
    .open       = fimc_capture_open,
    .release    = fimc_capture_close,
    .poll       = fimc_capture_poll,
    .unlocked_ioctl = video_ioctl2,
    .mmap       = fimc_capture_mmap,
};

/*
 * Format and crop negotiation helpers
 */

static struct fimc_fmt *fimc_capture_try_format(struct fimc_ctx *ctx,
                        u32 *width, u32 *height,
                        u32 *code, u32 *fourcc, int pad)
{
    bool rotation = ctx->rotation == 90 || ctx->rotation == 270;
    struct fimc_dev *fimc = ctx->fimc_dev;
    struct fimc_variant *var = fimc->variant;
    struct fimc_pix_limit *pl = var->pix_limit;
    struct fimc_frame *dst = &ctx->d_frame;
    u32 depth, min_w, max_w, min_h, align_h = 3;
    u32 mask = FMT_FLAGS_CAM;
    struct fimc_fmt *ffmt;

    /* Conversion from/to JPEG or User Defined format is not supported */
    if (code && ctx->s_frame.fmt && pad == FIMC_SD_PAD_SOURCE &&
        fimc_fmt_is_user_defined(ctx->s_frame.fmt->color))
        *code = ctx->s_frame.fmt->mbus_code;

    if (fourcc && *fourcc != V4L2_PIX_FMT_JPEG && pad != FIMC_SD_PAD_SINK)
        mask |= FMT_FLAGS_M2M;

    ffmt = fimc_find_format(fourcc, code, mask, 0);
    if (WARN_ON(!ffmt))
        return NULL;
    if (code)
        *code = ffmt->mbus_code;
    if (fourcc)
        *fourcc = ffmt->fourcc;

    if (pad == FIMC_SD_PAD_SINK) {
        max_w = fimc_fmt_is_user_defined(ffmt->color) ?
            pl->scaler_dis_w : pl->scaler_en_w;
        /* Apply the camera input interface pixel constraints */
        v4l_bound_align_image(width, max_t(u32, *width, 32), max_w, 4,
                      height, max_t(u32, *height, 32),
                      FIMC_CAMIF_MAX_HEIGHT,
                      fimc_fmt_is_user_defined(ffmt->color) ?
                      3 : 1,
                      0);
        return ffmt;
    }
    /* Can't scale or crop in transparent (JPEG) transfer mode */
    if (fimc_fmt_is_user_defined(ffmt->color)) {
        *width  = ctx->s_frame.f_width;
        *height = ctx->s_frame.f_height;
        return ffmt;
    }
    /* Apply the scaler and the output DMA constraints */
    max_w = rotation ? pl->out_rot_en_w : pl->out_rot_dis_w;
    if (ctx->state & FIMC_COMPOSE) {
        min_w = dst->offs_h + dst->width;
        min_h = dst->offs_v + dst->height;
    } else {
        min_w = var->min_out_pixsize;
        min_h = var->min_out_pixsize;
    }
    if (var->min_vsize_align == 1 && !rotation)
        align_h = fimc_fmt_is_rgb(ffmt->color) ? 0 : 1;

    depth = fimc_get_format_depth(ffmt);
    v4l_bound_align_image(width, min_w, max_w,
                  ffs(var->min_out_pixsize) - 1,
                  height, min_h, FIMC_CAMIF_MAX_HEIGHT,
                  align_h,
                  64/(ALIGN(depth, 8)));

    dbg("pad%d: code: 0x%x, %dx%d. dst fmt: %dx%d",
        pad, code ? *code : 0, *width, *height,
        dst->f_width, dst->f_height);

    return ffmt;
}

static void fimc_capture_try_selection(struct fimc_ctx *ctx,
                       struct v4l2_rect *r,
                       int target)
{
    bool rotate = ctx->rotation == 90 || ctx->rotation == 270;
    struct fimc_dev *fimc = ctx->fimc_dev;
    struct fimc_variant *var = fimc->variant;
    struct fimc_pix_limit *pl = var->pix_limit;
    struct fimc_frame *sink = &ctx->s_frame;
    u32 max_w, max_h, min_w = 0, min_h = 0, min_sz;
    u32 align_sz = 0, align_h = 4;
    u32 max_sc_h, max_sc_v;

    /* In JPEG transparent transfer mode cropping is not supported */
    if (fimc_fmt_is_user_defined(ctx->d_frame.fmt->color)) {
        r->width  = sink->f_width;
        r->height = sink->f_height;
        r->left   = r->top = 0;
        return;
    }
    if (target == V4L2_SEL_TGT_COMPOSE) {
        if (ctx->rotation != 90 && ctx->rotation != 270)
            align_h = 1;
        max_sc_h = min(SCALER_MAX_HRATIO, 1 << (ffs(sink->width) - 3));
        max_sc_v = min(SCALER_MAX_VRATIO, 1 << (ffs(sink->height) - 1));
        min_sz = var->min_out_pixsize;
    } else {
        u32 depth = fimc_get_format_depth(sink->fmt);
        align_sz = 64/ALIGN(depth, 8);
        min_sz = var->min_inp_pixsize;
        min_w = min_h = min_sz;
        max_sc_h = max_sc_v = 1;
    }
    /*
     * For the compose rectangle the following constraints must be met:
     * - it must fit in the sink pad format rectangle (f_width/f_height);
     * - maximum downscaling ratio is 64;
     * - maximum crop size depends if the rotator is used or not;
     * - the sink pad format width/height must be 4 multiple of the
     *   prescaler ratios determined by sink pad size and source pad crop,
     *   the prescaler ratio is returned by fimc_get_scaler_factor().
     */
    max_w = min_t(u32,
              rotate ? pl->out_rot_en_w : pl->out_rot_dis_w,
              rotate ? sink->f_height : sink->f_width);
    max_h = min_t(u32, FIMC_CAMIF_MAX_HEIGHT, sink->f_height);

    if (target == V4L2_SEL_TGT_COMPOSE) {
        min_w = min_t(u32, max_w, sink->f_width / max_sc_h);
        min_h = min_t(u32, max_h, sink->f_height / max_sc_v);
        if (rotate) {
            swap(max_sc_h, max_sc_v);
            swap(min_w, min_h);
        }
    }
    v4l_bound_align_image(&r->width, min_w, max_w, ffs(min_sz) - 1,
                  &r->height, min_h, max_h, align_h,
                  align_sz);
    /* Adjust left/top if crop/compose rectangle is out of bounds */
    r->left = clamp_t(u32, r->left, 0, sink->f_width - r->width);
    r->top  = clamp_t(u32, r->top, 0, sink->f_height - r->height);
    r->left = round_down(r->left, var->hor_offs_align);

    dbg("target %#x: (%d,%d)/%dx%d, sink fmt: %dx%d",
        target, r->left, r->top, r->width, r->height,
        sink->f_width, sink->f_height);
}

/*
 * The video node ioctl operations
 */
static int fimc_vidioc_querycap_capture(struct file *file, void *priv,
                    struct v4l2_capability *cap)
{
    struct fimc_dev *fimc = video_drvdata(file);

    strncpy(cap->driver, fimc->pdev->name, sizeof(cap->driver) - 1);
    strncpy(cap->card, fimc->pdev->name, sizeof(cap->card) - 1);
    cap->bus_info[0] = 0;
    cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE_MPLANE;

    return 0;
}

static int fimc_cap_enum_fmt_mplane(struct file *file, void *priv,
                    struct v4l2_fmtdesc *f)
{
    struct fimc_fmt *fmt;

    fmt = fimc_find_format(NULL, NULL, FMT_FLAGS_CAM | FMT_FLAGS_M2M,
                   f->index);
    if (!fmt)
        return -EINVAL;
    strncpy(f->description, fmt->name, sizeof(f->description) - 1);
    f->pixelformat = fmt->fourcc;
    if (fmt->fourcc == V4L2_MBUS_FMT_JPEG_1X8)
        f->flags |= V4L2_FMT_FLAG_COMPRESSED;
    return 0;
}

static int fimc_pipeline_try_format(struct fimc_ctx *ctx,
                    struct v4l2_mbus_framefmt *tfmt,
                    struct fimc_fmt **fmt_id,
                    bool set)
{
    struct fimc_dev *fimc = ctx->fimc_dev;
    struct v4l2_subdev *sd = fimc->pipeline.subdevs[IDX_SENSOR];
    struct v4l2_subdev *csis = fimc->pipeline.subdevs[IDX_CSIS];
    struct v4l2_subdev_format sfmt;
    struct v4l2_mbus_framefmt *mf = &sfmt.format;
    struct fimc_fmt *ffmt = NULL;
    int ret, i = 0;

    if (WARN_ON(!sd || !tfmt))
        return -EINVAL;

    memset(&sfmt, 0, sizeof(sfmt));
    sfmt.format = *tfmt;

    sfmt.which = set ? V4L2_SUBDEV_FORMAT_ACTIVE : V4L2_SUBDEV_FORMAT_TRY;
    while (1) {
        ffmt = fimc_find_format(NULL, mf->code != 0 ? &mf->code : NULL,
                    FMT_FLAGS_CAM, i++);
        if (ffmt == NULL) {
            /*
             * Notify user-space if common pixel code for
             * host and sensor does not exist.
             */
            return -EINVAL;
        }
        mf->code = tfmt->code = ffmt->mbus_code;

        ret = v4l2_subdev_call(sd, pad, set_fmt, NULL, &sfmt);
        if (ret)
            return ret;
        if (mf->code != tfmt->code) {
            mf->code = 0;
            continue;
        }
        if (mf->width != tfmt->width || mf->height != tfmt->height) {
            u32 fcc = ffmt->fourcc;
            tfmt->width  = mf->width;
            tfmt->height = mf->height;
            ffmt = fimc_capture_try_format(ctx,
                           &tfmt->width, &tfmt->height,
                           NULL, &fcc, FIMC_SD_PAD_SOURCE);
            if (ffmt && ffmt->mbus_code)
                mf->code = ffmt->mbus_code;
            if (mf->width != tfmt->width ||
                mf->height != tfmt->height)
                continue;
            tfmt->code = mf->code;
        }
        if (csis)
            ret = v4l2_subdev_call(csis, pad, set_fmt, NULL, &sfmt);

        if (mf->code == tfmt->code &&
            mf->width == tfmt->width && mf->height == tfmt->height)
            break;
    }

    if (fmt_id && ffmt)
        *fmt_id = ffmt;
    *tfmt = *mf;

    dbg("code: 0x%x, %dx%d, %p", mf->code, mf->width, mf->height, ffmt);
    return 0;
}

static int fimc_get_sensor_frame_desc(struct v4l2_subdev *sensor,
                      struct v4l2_plane_pix_format *plane_fmt,
                      unsigned int num_planes, bool try)
{
    struct v4l2_mbus_frame_desc fd;
    int i, ret;

    for (i = 0; i < num_planes; i++)
        fd.entry[i].length = plane_fmt[i].sizeimage;

    if (try)
        ret = v4l2_subdev_call(sensor, pad, set_frame_desc, 0, &fd);
    else
        ret = v4l2_subdev_call(sensor, pad, get_frame_desc, 0, &fd);

    if (ret < 0)
        return ret;

    if (num_planes != fd.num_entries)
        return -EINVAL;

    for (i = 0; i < num_planes; i++)
        plane_fmt[i].sizeimage = fd.entry[i].length;

    if (fd.entry[0].length > FIMC_MAX_JPEG_BUF_SIZE) {
        v4l2_err(sensor->v4l2_dev,  "Unsupported buffer size: %u\n",
             fd.entry[0].length);

        return -EINVAL;
    }

    return 0;
}

static int fimc_cap_g_fmt_mplane(struct file *file, void *fh,
                 struct v4l2_format *f)
{
    struct fimc_dev *fimc = video_drvdata(file);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;

    return fimc_fill_format(&ctx->d_frame, f);
}

static int fimc_cap_try_fmt_mplane(struct file *file, void *fh,
                   struct v4l2_format *f)
{
    struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
    struct fimc_dev *fimc = video_drvdata(file);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct v4l2_mbus_framefmt mf;
    struct fimc_fmt *ffmt = NULL;

    if (fimc_jpeg_fourcc(pix->pixelformat)) {
        fimc_capture_try_format(ctx, &pix->width, &pix->height,
                    NULL, &pix->pixelformat,
                    FIMC_SD_PAD_SINK);
        ctx->s_frame.f_width  = pix->width;
        ctx->s_frame.f_height = pix->height;
    }
    ffmt = fimc_capture_try_format(ctx, &pix->width, &pix->height,
                       NULL, &pix->pixelformat,
                       FIMC_SD_PAD_SOURCE);
    if (!ffmt)
        return -EINVAL;

    if (!fimc->vid_cap.user_subdev_api) {
        mf.width = pix->width;
        mf.height = pix->height;
        mf.code = ffmt->mbus_code;
        fimc_md_graph_lock(fimc);
        fimc_pipeline_try_format(ctx, &mf, &ffmt, false);
        fimc_md_graph_unlock(fimc);
        pix->width = mf.width;
        pix->height = mf.height;
        if (ffmt)
            pix->pixelformat = ffmt->fourcc;
    }

    fimc_adjust_mplane_format(ffmt, pix->width, pix->height, pix);

    if (ffmt->flags & FMT_FLAGS_COMPRESSED)
        fimc_get_sensor_frame_desc(fimc->pipeline.subdevs[IDX_SENSOR],
                    pix->plane_fmt, ffmt->memplanes, true);

    return 0;
}

static void fimc_capture_mark_jpeg_xfer(struct fimc_ctx *ctx,
                    enum fimc_color_fmt color)
{
    bool jpeg = fimc_fmt_is_user_defined(color);

    ctx->scaler.enabled = !jpeg;
    fimc_ctrls_activate(ctx, !jpeg);

    if (jpeg)
        set_bit(ST_CAPT_JPEG, &ctx->fimc_dev->state);
    else
        clear_bit(ST_CAPT_JPEG, &ctx->fimc_dev->state);
}

static int fimc_capture_set_format(struct fimc_dev *fimc, struct v4l2_format *f)
{
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
    struct v4l2_mbus_framefmt *mf = &fimc->vid_cap.mf;
    struct fimc_frame *ff = &ctx->d_frame;
    struct fimc_fmt *s_fmt = NULL;
    int ret, i;

    if (vb2_is_busy(&fimc->vid_cap.vbq))
        return -EBUSY;

    /* Pre-configure format at camera interface input, for JPEG only */
    if (fimc_jpeg_fourcc(pix->pixelformat)) {
        fimc_capture_try_format(ctx, &pix->width, &pix->height,
                    NULL, &pix->pixelformat,
                    FIMC_SD_PAD_SINK);
        ctx->s_frame.f_width  = pix->width;
        ctx->s_frame.f_height = pix->height;
    }
    /* Try the format at the scaler and the DMA output */
    ff->fmt = fimc_capture_try_format(ctx, &pix->width, &pix->height,
                      NULL, &pix->pixelformat,
                      FIMC_SD_PAD_SOURCE);
    if (!ff->fmt)
        return -EINVAL;

    /* Update RGB Alpha control state and value range */
    fimc_alpha_ctrl_update(ctx);

    /* Try to match format at the host and the sensor */
    if (!fimc->vid_cap.user_subdev_api) {
        mf->code   = ff->fmt->mbus_code;
        mf->width  = pix->width;
        mf->height = pix->height;

        fimc_md_graph_lock(fimc);
        ret = fimc_pipeline_try_format(ctx, mf, &s_fmt, true);
        fimc_md_graph_unlock(fimc);
        if (ret)
            return ret;
        pix->width  = mf->width;
        pix->height = mf->height;
    }

    fimc_adjust_mplane_format(ff->fmt, pix->width, pix->height, pix);

    if (ff->fmt->flags & FMT_FLAGS_COMPRESSED) {
        ret = fimc_get_sensor_frame_desc(fimc->pipeline.subdevs[IDX_SENSOR],
                    pix->plane_fmt, ff->fmt->memplanes,
                    true);
        if (ret < 0)
            return ret;
    }

    for (i = 0; i < ff->fmt->memplanes; i++)
        ff->payload[i] = pix->plane_fmt[i].sizeimage;

    set_frame_bounds(ff, pix->width, pix->height);
    /* Reset the composition rectangle if not yet configured */
    if (!(ctx->state & FIMC_COMPOSE))
        set_frame_crop(ff, 0, 0, pix->width, pix->height);

    fimc_capture_mark_jpeg_xfer(ctx, ff->fmt->color);

    /* Reset cropping and set format at the camera interface input */
    if (!fimc->vid_cap.user_subdev_api) {
        ctx->s_frame.fmt = s_fmt;
        set_frame_bounds(&ctx->s_frame, pix->width, pix->height);
        set_frame_crop(&ctx->s_frame, 0, 0, pix->width, pix->height);
    }

    return ret;
}

static int fimc_cap_s_fmt_mplane(struct file *file, void *priv,
                 struct v4l2_format *f)
{
    struct fimc_dev *fimc = video_drvdata(file);

    return fimc_capture_set_format(fimc, f);
}

static int fimc_cap_enum_input(struct file *file, void *priv,
                   struct v4l2_input *i)
{
    struct fimc_dev *fimc = video_drvdata(file);
    struct v4l2_subdev *sd = fimc->pipeline.subdevs[IDX_SENSOR];

    if (i->index != 0)
        return -EINVAL;

    i->type = V4L2_INPUT_TYPE_CAMERA;
    if (sd)
        strlcpy(i->name, sd->name, sizeof(i->name));
    return 0;
}

static int fimc_cap_s_input(struct file *file, void *priv, unsigned int i)
{
    return i == 0 ? i : -EINVAL;
}

static int fimc_cap_g_input(struct file *file, void *priv, unsigned int *i)
{
    *i = 0;
    return 0;
}

static int fimc_pipeline_validate(struct fimc_dev *fimc)
{
    struct v4l2_subdev_format sink_fmt, src_fmt;
    struct fimc_vid_cap *vid_cap = &fimc->vid_cap;
    struct v4l2_subdev *sd;
    struct media_pad *pad;
    int ret;

    /* Start with the video capture node pad */
    pad = media_entity_remote_source(&vid_cap->vd_pad);
    if (pad == NULL)
        return -EPIPE;
    /* FIMC.{N} subdevice */
    sd = media_entity_to_v4l2_subdev(pad->entity);

    while (1) {
        /* Retrieve format at the sink pad */
        pad = &sd->entity.pads[0];
        if (!(pad->flags & MEDIA_PAD_FL_SINK))
            break;
        /* Don't call FIMC subdev operation to avoid nested locking */
        if (sd == &fimc->vid_cap.subdev) {
            struct fimc_frame *ff = &vid_cap->ctx->s_frame;
            sink_fmt.format.width = ff->f_width;
            sink_fmt.format.height = ff->f_height;
            sink_fmt.format.code = ff->fmt ? ff->fmt->mbus_code : 0;
        } else {
            sink_fmt.pad = pad->index;
            sink_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
            ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &sink_fmt);
            if (ret < 0 && ret != -ENOIOCTLCMD)
                return -EPIPE;
        }
        /* Retrieve format at the source pad */
        pad = media_entity_remote_source(pad);
        if (pad == NULL ||
            media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
            break;

        sd = media_entity_to_v4l2_subdev(pad->entity);
        src_fmt.pad = pad->index;
        src_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
        ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &src_fmt);
        if (ret < 0 && ret != -ENOIOCTLCMD)
            return -EPIPE;

        if (src_fmt.format.width != sink_fmt.format.width ||
            src_fmt.format.height != sink_fmt.format.height ||
            src_fmt.format.code != sink_fmt.format.code)
            return -EPIPE;

        if (sd == fimc->pipeline.subdevs[IDX_SENSOR] &&
            fimc_user_defined_mbus_fmt(src_fmt.format.code)) {
            struct v4l2_plane_pix_format plane_fmt[FIMC_MAX_PLANES];
            struct fimc_frame *frame = &vid_cap->ctx->d_frame;
            unsigned int i;

            ret = fimc_get_sensor_frame_desc(sd, plane_fmt,
                             frame->fmt->memplanes,
                             false);
            if (ret < 0)
                return -EPIPE;

            for (i = 0; i < frame->fmt->memplanes; i++)
                if (frame->payload[i] < plane_fmt[i].sizeimage)
                    return -EPIPE;
        }
    }
    return 0;
}

static int fimc_cap_streamon(struct file *file, void *priv,
                 enum v4l2_buf_type type)
{
    struct fimc_dev *fimc = video_drvdata(file);
    struct fimc_pipeline *p = &fimc->pipeline;
    struct v4l2_subdev *sd = p->subdevs[IDX_SENSOR];
    int ret;

    if (fimc_capture_active(fimc))
        return -EBUSY;

    ret = media_entity_pipeline_start(&sd->entity, p->m_pipeline);
    if (ret < 0)
        return ret;

    if (fimc->vid_cap.user_subdev_api) {
        ret = fimc_pipeline_validate(fimc);
        if (ret < 0) {
            media_entity_pipeline_stop(&sd->entity);
            return ret;
        }
    }
    return vb2_streamon(&fimc->vid_cap.vbq, type);
}

static int fimc_cap_streamoff(struct file *file, void *priv,
                enum v4l2_buf_type type)
{
    struct fimc_dev *fimc = video_drvdata(file);
    struct v4l2_subdev *sd = fimc->pipeline.subdevs[IDX_SENSOR];
    int ret;

    ret = vb2_streamoff(&fimc->vid_cap.vbq, type);
    if (ret == 0)
        media_entity_pipeline_stop(&sd->entity);
    return ret;
}

static int fimc_cap_reqbufs(struct file *file, void *priv,
                struct v4l2_requestbuffers *reqbufs)
{
    struct fimc_dev *fimc = video_drvdata(file);
    int ret = vb2_reqbufs(&fimc->vid_cap.vbq, reqbufs);

    if (!ret)
        fimc->vid_cap.reqbufs_count = reqbufs->count;
    return ret;
}

static int fimc_cap_querybuf(struct file *file, void *priv,
               struct v4l2_buffer *buf)
{
    struct fimc_dev *fimc = video_drvdata(file);

    return vb2_querybuf(&fimc->vid_cap.vbq, buf);
}

static int fimc_cap_qbuf(struct file *file, void *priv,
              struct v4l2_buffer *buf)
{
    struct fimc_dev *fimc = video_drvdata(file);

    return vb2_qbuf(&fimc->vid_cap.vbq, buf);
}

static int fimc_cap_dqbuf(struct file *file, void *priv,
               struct v4l2_buffer *buf)
{
    struct fimc_dev *fimc = video_drvdata(file);

    return vb2_dqbuf(&fimc->vid_cap.vbq, buf, file->f_flags & O_NONBLOCK);
}

static int fimc_cap_create_bufs(struct file *file, void *priv,
                struct v4l2_create_buffers *create)
{
    struct fimc_dev *fimc = video_drvdata(file);

    return vb2_create_bufs(&fimc->vid_cap.vbq, create);
}

static int fimc_cap_prepare_buf(struct file *file, void *priv,
                struct v4l2_buffer *b)
{
    struct fimc_dev *fimc = video_drvdata(file);

    return vb2_prepare_buf(&fimc->vid_cap.vbq, b);
}

static int fimc_cap_g_selection(struct file *file, void *fh,
                struct v4l2_selection *s)
{
    struct fimc_dev *fimc = video_drvdata(file);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct fimc_frame *f = &ctx->s_frame;

    if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
        return -EINVAL;

    switch (s->target) {
    case V4L2_SEL_TGT_COMPOSE_DEFAULT:
    case V4L2_SEL_TGT_COMPOSE_BOUNDS:
        f = &ctx->d_frame;
    case V4L2_SEL_TGT_CROP_BOUNDS:
    case V4L2_SEL_TGT_CROP_DEFAULT:
        s->r.left = 0;
        s->r.top = 0;
        s->r.width = f->o_width;
        s->r.height = f->o_height;
        return 0;

    case V4L2_SEL_TGT_COMPOSE:
        f = &ctx->d_frame;
    case V4L2_SEL_TGT_CROP:
        s->r.left = f->offs_h;
        s->r.top = f->offs_v;
        s->r.width = f->width;
        s->r.height = f->height;
        return 0;
    }

    return -EINVAL;
}

/* Return 1 if rectangle a is enclosed in rectangle b, or 0 otherwise. */
static int enclosed_rectangle(struct v4l2_rect *a, struct v4l2_rect *b)
{
    if (a->left < b->left || a->top < b->top)
        return 0;
    if (a->left + a->width > b->left + b->width)
        return 0;
    if (a->top + a->height > b->top + b->height)
        return 0;

    return 1;
}

static int fimc_cap_s_selection(struct file *file, void *fh,
                struct v4l2_selection *s)
{
    struct fimc_dev *fimc = video_drvdata(file);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct v4l2_rect rect = s->r;
    struct fimc_frame *f;
    unsigned long flags;

    if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
        return -EINVAL;

    if (s->target == V4L2_SEL_TGT_COMPOSE)
        f = &ctx->d_frame;
    else if (s->target == V4L2_SEL_TGT_CROP)
        f = &ctx->s_frame;
    else
        return -EINVAL;

    fimc_capture_try_selection(ctx, &rect, s->target);

    if (s->flags & V4L2_SEL_FLAG_LE &&
        !enclosed_rectangle(&rect, &s->r))
        return -ERANGE;

    if (s->flags & V4L2_SEL_FLAG_GE &&
        !enclosed_rectangle(&s->r, &rect))
        return -ERANGE;

    s->r = rect;
    spin_lock_irqsave(&fimc->slock, flags);
    set_frame_crop(f, s->r.left, s->r.top, s->r.width,
               s->r.height);
    spin_unlock_irqrestore(&fimc->slock, flags);

    set_bit(ST_CAPT_APPLY_CFG, &fimc->state);
    return 0;
}

static const struct v4l2_ioctl_ops fimc_capture_ioctl_ops = {
    .vidioc_querycap        = fimc_vidioc_querycap_capture,

    .vidioc_enum_fmt_vid_cap_mplane = fimc_cap_enum_fmt_mplane,
    .vidioc_try_fmt_vid_cap_mplane  = fimc_cap_try_fmt_mplane,
    .vidioc_s_fmt_vid_cap_mplane    = fimc_cap_s_fmt_mplane,
    .vidioc_g_fmt_vid_cap_mplane    = fimc_cap_g_fmt_mplane,

    .vidioc_reqbufs         = fimc_cap_reqbufs,
    .vidioc_querybuf        = fimc_cap_querybuf,

    .vidioc_qbuf            = fimc_cap_qbuf,
    .vidioc_dqbuf           = fimc_cap_dqbuf,

    .vidioc_prepare_buf     = fimc_cap_prepare_buf,
    .vidioc_create_bufs     = fimc_cap_create_bufs,

    .vidioc_streamon        = fimc_cap_streamon,
    .vidioc_streamoff       = fimc_cap_streamoff,

    .vidioc_g_selection     = fimc_cap_g_selection,
    .vidioc_s_selection     = fimc_cap_s_selection,

    .vidioc_enum_input      = fimc_cap_enum_input,
    .vidioc_s_input         = fimc_cap_s_input,
    .vidioc_g_input         = fimc_cap_g_input,
};

/* Capture subdev media entity operations */
static int fimc_link_setup(struct media_entity *entity,
               const struct media_pad *local,
               const struct media_pad *remote, u32 flags)
{
    struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);

    if (media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
        return -EINVAL;

    if (WARN_ON(fimc == NULL))
        return 0;

    dbg("%s --> %s, flags: 0x%x. input: 0x%x",
        local->entity->name, remote->entity->name, flags,
        fimc->vid_cap.input);

    if (flags & MEDIA_LNK_FL_ENABLED) {
        if (fimc->vid_cap.input != 0)
            return -EBUSY;
        fimc->vid_cap.input = sd->grp_id;
        return 0;
    }

    fimc->vid_cap.input = 0;
    return 0;
}

static const struct media_entity_operations fimc_sd_media_ops = {
    .link_setup = fimc_link_setup,
};

void fimc_sensor_notify(struct v4l2_subdev *sd, unsigned int notification,
            void *arg)
{
    struct fimc_sensor_info *sensor;
    struct fimc_vid_buffer *buf;
    struct fimc_md *fmd;
    struct fimc_dev *fimc;
    unsigned long flags;

    if (sd == NULL)
        return;

    sensor = v4l2_get_subdev_hostdata(sd);
    fmd = entity_to_fimc_mdev(&sd->entity);

    spin_lock_irqsave(&fmd->slock, flags);
    fimc = sensor ? sensor->host : NULL;

    if (fimc && arg && notification == S5P_FIMC_TX_END_NOTIFY &&
        test_bit(ST_CAPT_PEND, &fimc->state)) {
        unsigned long irq_flags;
        spin_lock_irqsave(&fimc->slock, irq_flags);
        if (!list_empty(&fimc->vid_cap.active_buf_q)) {
            buf = list_entry(fimc->vid_cap.active_buf_q.next,
                     struct fimc_vid_buffer, list);
            vb2_set_plane_payload(&buf->vb, 0, *((u32 *)arg));
        }
        fimc_capture_irq_handler(fimc, 1);
        fimc_deactivate_capture(fimc);
        spin_unlock_irqrestore(&fimc->slock, irq_flags);
    }
    spin_unlock_irqrestore(&fmd->slock, flags);
}

static int fimc_subdev_enum_mbus_code(struct v4l2_subdev *sd,
                      struct v4l2_subdev_fh *fh,
                      struct v4l2_subdev_mbus_code_enum *code)
{
    struct fimc_fmt *fmt;

    fmt = fimc_find_format(NULL, NULL, FMT_FLAGS_CAM, code->index);
    if (!fmt)
        return -EINVAL;
    code->code = fmt->mbus_code;
    return 0;
}

static int fimc_subdev_get_fmt(struct v4l2_subdev *sd,
                   struct v4l2_subdev_fh *fh,
                   struct v4l2_subdev_format *fmt)
{
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct v4l2_mbus_framefmt *mf;
    struct fimc_frame *ff;

    if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
        mf = v4l2_subdev_get_try_format(fh, fmt->pad);
        fmt->format = *mf;
        return 0;
    }
    mf = &fmt->format;
    mf->colorspace = V4L2_COLORSPACE_JPEG;
    ff = fmt->pad == FIMC_SD_PAD_SINK ? &ctx->s_frame : &ctx->d_frame;

    mutex_lock(&fimc->lock);
    /* The pixel code is same on both input and output pad */
    if (!WARN_ON(ctx->s_frame.fmt == NULL))
        mf->code = ctx->s_frame.fmt->mbus_code;
    mf->width  = ff->f_width;
    mf->height = ff->f_height;
    mutex_unlock(&fimc->lock);

    return 0;
}

static int fimc_subdev_set_fmt(struct v4l2_subdev *sd,
                   struct v4l2_subdev_fh *fh,
                   struct v4l2_subdev_format *fmt)
{
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *mf = &fmt->format;
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct fimc_frame *ff;
    struct fimc_fmt *ffmt;

    dbg("pad%d: code: 0x%x, %dx%d",
        fmt->pad, mf->code, mf->width, mf->height);

    if (fmt->pad == FIMC_SD_PAD_SOURCE &&
        vb2_is_busy(&fimc->vid_cap.vbq))
        return -EBUSY;

    mutex_lock(&fimc->lock);
    ffmt = fimc_capture_try_format(ctx, &mf->width, &mf->height,
                       &mf->code, NULL, fmt->pad);
    mutex_unlock(&fimc->lock);
    mf->colorspace = V4L2_COLORSPACE_JPEG;

    if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
        mf = v4l2_subdev_get_try_format(fh, fmt->pad);
        *mf = fmt->format;
        return 0;
    }
    /* Update RGB Alpha control state and value range */
    fimc_alpha_ctrl_update(ctx);

    fimc_capture_mark_jpeg_xfer(ctx, ffmt->color);

    ff = fmt->pad == FIMC_SD_PAD_SINK ?
        &ctx->s_frame : &ctx->d_frame;

    mutex_lock(&fimc->lock);
    set_frame_bounds(ff, mf->width, mf->height);
    fimc->vid_cap.mf = *mf;
    ff->fmt = ffmt;

    /* Reset the crop rectangle if required. */
    if (!(fmt->pad == FIMC_SD_PAD_SOURCE && (ctx->state & FIMC_COMPOSE)))
        set_frame_crop(ff, 0, 0, mf->width, mf->height);

    if (fmt->pad == FIMC_SD_PAD_SINK)
        ctx->state &= ~FIMC_COMPOSE;
    mutex_unlock(&fimc->lock);
    return 0;
}

static int fimc_subdev_get_selection(struct v4l2_subdev *sd,
                     struct v4l2_subdev_fh *fh,
                     struct v4l2_subdev_selection *sel)
{
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct fimc_frame *f = &ctx->s_frame;
    struct v4l2_rect *r = &sel->r;
    struct v4l2_rect *try_sel;

    if (sel->pad != FIMC_SD_PAD_SINK)
        return -EINVAL;

    mutex_lock(&fimc->lock);

    switch (sel->target) {
    case V4L2_SEL_TGT_COMPOSE_BOUNDS:
        f = &ctx->d_frame;
    case V4L2_SEL_TGT_CROP_BOUNDS:
        r->width = f->o_width;
        r->height = f->o_height;
        r->left = 0;
        r->top = 0;
        mutex_unlock(&fimc->lock);
        return 0;

    case V4L2_SEL_TGT_CROP:
        try_sel = v4l2_subdev_get_try_crop(fh, sel->pad);
        break;
    case V4L2_SEL_TGT_COMPOSE:
        try_sel = v4l2_subdev_get_try_compose(fh, sel->pad);
        f = &ctx->d_frame;
        break;
    default:
        mutex_unlock(&fimc->lock);
        return -EINVAL;
    }

    if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
        sel->r = *try_sel;
    } else {
        r->left = f->offs_h;
        r->top = f->offs_v;
        r->width = f->width;
        r->height = f->height;
    }

    dbg("target %#x: l:%d, t:%d, %dx%d, f_w: %d, f_h: %d",
        sel->pad, r->left, r->top, r->width, r->height,
        f->f_width, f->f_height);

    mutex_unlock(&fimc->lock);
    return 0;
}

static int fimc_subdev_set_selection(struct v4l2_subdev *sd,
                     struct v4l2_subdev_fh *fh,
                     struct v4l2_subdev_selection *sel)
{
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);
    struct fimc_ctx *ctx = fimc->vid_cap.ctx;
    struct fimc_frame *f = &ctx->s_frame;
    struct v4l2_rect *r = &sel->r;
    struct v4l2_rect *try_sel;
    unsigned long flags;

    if (sel->pad != FIMC_SD_PAD_SINK)
        return -EINVAL;

    mutex_lock(&fimc->lock);
    fimc_capture_try_selection(ctx, r, V4L2_SEL_TGT_CROP);

    switch (sel->target) {
    case V4L2_SEL_TGT_COMPOSE_BOUNDS:
        f = &ctx->d_frame;
    case V4L2_SEL_TGT_CROP_BOUNDS:
        r->width = f->o_width;
        r->height = f->o_height;
        r->left = 0;
        r->top = 0;
        mutex_unlock(&fimc->lock);
        return 0;

    case V4L2_SEL_TGT_CROP:
        try_sel = v4l2_subdev_get_try_crop(fh, sel->pad);
        break;
    case V4L2_SEL_TGT_COMPOSE:
        try_sel = v4l2_subdev_get_try_compose(fh, sel->pad);
        f = &ctx->d_frame;
        break;
    default:
        mutex_unlock(&fimc->lock);
        return -EINVAL;
    }

    if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
        *try_sel = sel->r;
    } else {
        spin_lock_irqsave(&fimc->slock, flags);
        set_frame_crop(f, r->left, r->top, r->width, r->height);
        set_bit(ST_CAPT_APPLY_CFG, &fimc->state);
        spin_unlock_irqrestore(&fimc->slock, flags);
        if (sel->target == V4L2_SEL_TGT_COMPOSE)
            ctx->state |= FIMC_COMPOSE;
    }

    dbg("target %#x: (%d,%d)/%dx%d", sel->target, r->left, r->top,
        r->width, r->height);

    mutex_unlock(&fimc->lock);
    return 0;
}

static struct v4l2_subdev_pad_ops fimc_subdev_pad_ops = {
    .enum_mbus_code = fimc_subdev_enum_mbus_code,
    .get_selection = fimc_subdev_get_selection,
    .set_selection = fimc_subdev_set_selection,
    .get_fmt = fimc_subdev_get_fmt,
    .set_fmt = fimc_subdev_set_fmt,
};

static struct v4l2_subdev_ops fimc_subdev_ops = {
    .pad = &fimc_subdev_pad_ops,
};

/* Set default format at the sensor and host interface */
static int fimc_capture_set_default_format(struct fimc_dev *fimc)
{
    struct v4l2_format fmt = {
        .type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
        .fmt.pix_mp = {
            .width      = 640,
            .height     = 480,
            .pixelformat    = V4L2_PIX_FMT_YUYV,
            .field      = V4L2_FIELD_NONE,
            .colorspace = V4L2_COLORSPACE_JPEG,
        },
    };

    return fimc_capture_set_format(fimc, &fmt);
}

/* fimc->lock must be already initialized */
static int fimc_register_capture_device(struct fimc_dev *fimc,
                 struct v4l2_device *v4l2_dev)
{
    struct video_device *vfd = &fimc->vid_cap.vfd;
    struct fimc_vid_cap *vid_cap;
    struct fimc_ctx *ctx;
    struct vb2_queue *q;
    int ret = -ENOMEM;

    ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
    if (!ctx)
        return -ENOMEM;

    ctx->fimc_dev    = fimc;
    ctx->in_path     = FIMC_IO_CAMERA;
    ctx->out_path    = FIMC_IO_DMA;
    ctx->state   = FIMC_CTX_CAP;
    ctx->s_frame.fmt = fimc_find_format(NULL, NULL, FMT_FLAGS_CAM, 0);
    ctx->d_frame.fmt = ctx->s_frame.fmt;

    memset(vfd, 0, sizeof(*vfd));
    snprintf(vfd->name, sizeof(vfd->name), "fimc.%d.capture", fimc->id);

    vfd->fops   = &fimc_capture_fops;
    vfd->ioctl_ops  = &fimc_capture_ioctl_ops;
    vfd->v4l2_dev   = v4l2_dev;
    vfd->minor  = -1;
    vfd->release    = video_device_release_empty;
    vfd->lock   = &fimc->lock;

    video_set_drvdata(vfd, fimc);

    vid_cap = &fimc->vid_cap;
    vid_cap->active_buf_cnt = 0;
    vid_cap->reqbufs_count  = 0;
    vid_cap->refcnt = 0;

    INIT_LIST_HEAD(&vid_cap->pending_buf_q);
    INIT_LIST_HEAD(&vid_cap->active_buf_q);
    vid_cap->ctx = ctx;

    q = &fimc->vid_cap.vbq;
    memset(q, 0, sizeof(*q));
    q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
    q->io_modes = VB2_MMAP | VB2_USERPTR;
    q->drv_priv = fimc->vid_cap.ctx;
    q->ops = &fimc_capture_qops;
    q->mem_ops = &vb2_dma_contig_memops;
    q->buf_struct_size = sizeof(struct fimc_vid_buffer);

    ret = vb2_queue_init(q);
    if (ret)
        goto err_ent;

    vid_cap->vd_pad.flags = MEDIA_PAD_FL_SINK;
    ret = media_entity_init(&vfd->entity, 1, &vid_cap->vd_pad, 0);
    if (ret)
        goto err_ent;

    ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
    if (ret)
        goto err_vd;

    v4l2_info(v4l2_dev, "Registered %s as /dev/%s\n",
          vfd->name, video_device_node_name(vfd));

    vfd->ctrl_handler = &ctx->ctrls.handler;
    return 0;

err_vd:
    media_entity_cleanup(&vfd->entity);
err_ent:
    kfree(ctx);
    return ret;
}

static int fimc_capture_subdev_registered(struct v4l2_subdev *sd)
{
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);
    int ret;

    if (fimc == NULL)
        return -ENXIO;

    ret = fimc_register_m2m_device(fimc, sd->v4l2_dev);
    if (ret)
        return ret;

    fimc->pipeline_ops = v4l2_get_subdev_hostdata(sd);

    ret = fimc_register_capture_device(fimc, sd->v4l2_dev);
    if (ret) {
        fimc_unregister_m2m_device(fimc);
        fimc->pipeline_ops = NULL;
    }

    return ret;
}

static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
{
    struct fimc_dev *fimc = v4l2_get_subdevdata(sd);

    if (fimc == NULL)
        return;

    fimc_unregister_m2m_device(fimc);

    if (video_is_registered(&fimc->vid_cap.vfd)) {
        video_unregister_device(&fimc->vid_cap.vfd);
        media_entity_cleanup(&fimc->vid_cap.vfd.entity);
        fimc->pipeline_ops = NULL;
    }
    kfree(fimc->vid_cap.ctx);
    fimc->vid_cap.ctx = NULL;
}

static const struct v4l2_subdev_internal_ops fimc_capture_sd_internal_ops = {
    .registered = fimc_capture_subdev_registered,
    .unregistered = fimc_capture_subdev_unregistered,
};

int fimc_initialize_capture_subdev(struct fimc_dev *fimc)
{
    struct v4l2_subdev *sd = &fimc->vid_cap.subdev;
    int ret;

    v4l2_subdev_init(sd, &fimc_subdev_ops);
    sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
    snprintf(sd->name, sizeof(sd->name), "FIMC.%d", fimc->pdev->id);

    fimc->vid_cap.sd_pads[FIMC_SD_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
    fimc->vid_cap.sd_pads[FIMC_SD_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
    ret = media_entity_init(&sd->entity, FIMC_SD_PADS_NUM,
                fimc->vid_cap.sd_pads, 0);
    if (ret)
        return ret;

    sd->entity.ops = &fimc_sd_media_ops;
    sd->internal_ops = &fimc_capture_sd_internal_ops;
    v4l2_set_subdevdata(sd, fimc);
    return 0;
}

void fimc_unregister_capture_subdev(struct fimc_dev *fimc)
{
    struct v4l2_subdev *sd = &fimc->vid_cap.subdev;

    v4l2_device_unregister_subdev(sd);
    media_entity_cleanup(&sd->entity);
    v4l2_set_subdevdata(sd, NULL);
}