fimc-lite.c

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/*
 * Samsung EXYNOS FIMC-LITE (camera host interface) driver
*
 * Copyright (C) 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.
 */
#define pr_fmt(fmt) "%s:%d " fmt, __func__, __LINE__

#include <linux/bug.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.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 <media/s5p_fimc.h>

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

static int debug;
module_param(debug, int, 0644);

static const struct fimc_fmt fimc_lite_formats[] = {
    {
        .name       = "YUV 4:2:2 packed, YCbYCr",
        .fourcc     = V4L2_PIX_FMT_YUYV,
        .depth      = { 16 },
        .color      = FIMC_FMT_YCBYCR422,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_YUYV8_2X8,
    }, {
        .name       = "YUV 4:2:2 packed, CbYCrY",
        .fourcc     = V4L2_PIX_FMT_UYVY,
        .depth      = { 16 },
        .color      = FIMC_FMT_CBYCRY422,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_UYVY8_2X8,
    }, {
        .name       = "YUV 4:2:2 packed, CrYCbY",
        .fourcc     = V4L2_PIX_FMT_VYUY,
        .depth      = { 16 },
        .color      = FIMC_FMT_CRYCBY422,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_VYUY8_2X8,
    }, {
        .name       = "YUV 4:2:2 packed, YCrYCb",
        .fourcc     = V4L2_PIX_FMT_YVYU,
        .depth      = { 16 },
        .color      = FIMC_FMT_YCRYCB422,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_YVYU8_2X8,
    }, {
        .name       = "RAW8 (GRBG)",
        .fourcc     = V4L2_PIX_FMT_SGRBG8,
        .depth      = { 8 },
        .color      = FIMC_FMT_RAW8,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_SGRBG8_1X8,
    }, {
        .name       = "RAW10 (GRBG)",
        .fourcc     = V4L2_PIX_FMT_SGRBG10,
        .depth      = { 10 },
        .color      = FIMC_FMT_RAW10,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_SGRBG10_1X10,
    }, {
        .name       = "RAW12 (GRBG)",
        .fourcc     = V4L2_PIX_FMT_SGRBG12,
        .depth      = { 12 },
        .color      = FIMC_FMT_RAW12,
        .memplanes  = 1,
        .mbus_code  = V4L2_MBUS_FMT_SGRBG12_1X12,
    },
};

static const struct fimc_fmt *fimc_lite_find_format(const u32 *pixelformat,
                    const u32 *mbus_code, int index)
{
    const struct fimc_fmt *fmt, *def_fmt = NULL;
    unsigned int i;
    int id = 0;

    if (index >= (int)ARRAY_SIZE(fimc_lite_formats))
        return NULL;

    for (i = 0; i < ARRAY_SIZE(fimc_lite_formats); ++i) {
        fmt = &fimc_lite_formats[i];
        if (pixelformat && fmt->fourcc == *pixelformat)
            return fmt;
        if (mbus_code && fmt->mbus_code == *mbus_code)
            return fmt;
        if (index == id)
            def_fmt = fmt;
        id++;
    }
    return def_fmt;
}

static int fimc_lite_hw_init(struct fimc_lite *fimc)
{
    struct fimc_pipeline *pipeline = &fimc->pipeline;
    struct fimc_sensor_info *sensor;
    unsigned long flags;

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

    if (fimc->fmt == NULL)
        return -EINVAL;

    sensor = v4l2_get_subdev_hostdata(pipeline->subdevs[IDX_SENSOR]);
    spin_lock_irqsave(&fimc->slock, flags);

    flite_hw_set_camera_bus(fimc, &sensor->pdata);
    flite_hw_set_source_format(fimc, &fimc->inp_frame);
    flite_hw_set_window_offset(fimc, &fimc->inp_frame);
    flite_hw_set_output_dma(fimc, &fimc->out_frame, true);
    flite_hw_set_interrupt_mask(fimc);
    flite_hw_set_test_pattern(fimc, fimc->test_pattern->val);

    if (debug > 0)
        flite_hw_dump_regs(fimc, __func__);

    spin_unlock_irqrestore(&fimc->slock, flags);
    return 0;
}

/*
 * 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_lite_reinit(struct fimc_lite *fimc, bool suspend)
{
    struct flite_buffer *buf;
    unsigned long flags;
    bool streaming;

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

    fimc->state &= ~(1 << ST_FLITE_RUN | 1 << ST_FLITE_OFF |
             1 << ST_FLITE_STREAM | 1 << ST_SENSOR_STREAM);
    if (suspend)
        fimc->state |= (1 << ST_FLITE_SUSPENDED);
    else
        fimc->state &= ~(1 << ST_FLITE_PENDING |
                 1 << ST_FLITE_SUSPENDED);

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

    spin_unlock_irqrestore(&fimc->slock, flags);

    flite_hw_reset(fimc);

    if (!streaming)
        return 0;

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

static int fimc_lite_stop_capture(struct fimc_lite *fimc, bool suspend)
{
    unsigned long flags;

    if (!fimc_lite_active(fimc))
        return 0;

    spin_lock_irqsave(&fimc->slock, flags);
    set_bit(ST_FLITE_OFF, &fimc->state);
    flite_hw_capture_stop(fimc);
    spin_unlock_irqrestore(&fimc->slock, flags);

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

    return fimc_lite_reinit(fimc, suspend);
}

/* Must be called  with fimc.slock spinlock held. */
static void fimc_lite_config_update(struct fimc_lite *fimc)
{
    flite_hw_set_window_offset(fimc, &fimc->inp_frame);
    flite_hw_set_dma_window(fimc, &fimc->out_frame);
    flite_hw_set_test_pattern(fimc, fimc->test_pattern->val);
    clear_bit(ST_FLITE_CONFIG, &fimc->state);
}

static irqreturn_t flite_irq_handler(int irq, void *priv)
{
    struct fimc_lite *fimc = priv;
    struct flite_buffer *vbuf;
    unsigned long flags;
    struct timeval *tv;
    struct timespec ts;
    u32 intsrc;

    spin_lock_irqsave(&fimc->slock, flags);

    intsrc = flite_hw_get_interrupt_source(fimc);
    flite_hw_clear_pending_irq(fimc);

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

    if (intsrc & FLITE_REG_CISTATUS_IRQ_SRC_OVERFLOW) {
        clear_bit(ST_FLITE_RUN, &fimc->state);
        fimc->events.data_overflow++;
    }

    if (intsrc & FLITE_REG_CISTATUS_IRQ_SRC_LASTCAPEND) {
        flite_hw_clear_last_capture_end(fimc);
        clear_bit(ST_FLITE_STREAM, &fimc->state);
        wake_up(&fimc->irq_queue);
    }

    if (fimc->out_path != FIMC_IO_DMA)
        goto done;

    if ((intsrc & FLITE_REG_CISTATUS_IRQ_SRC_FRMSTART) &&
        test_bit(ST_FLITE_RUN, &fimc->state) &&
        !list_empty(&fimc->active_buf_q) &&
        !list_empty(&fimc->pending_buf_q)) {
        vbuf = fimc_lite_active_queue_pop(fimc);
        ktime_get_ts(&ts);
        tv = &vbuf->vb.v4l2_buf.timestamp;
        tv->tv_sec = ts.tv_sec;
        tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
        vbuf->vb.v4l2_buf.sequence = fimc->frame_count++;
        vb2_buffer_done(&vbuf->vb, VB2_BUF_STATE_DONE);

        vbuf = fimc_lite_pending_queue_pop(fimc);
        flite_hw_set_output_addr(fimc, vbuf->paddr);
        fimc_lite_active_queue_add(fimc, vbuf);
    }

    if (test_bit(ST_FLITE_CONFIG, &fimc->state))
        fimc_lite_config_update(fimc);

    if (list_empty(&fimc->pending_buf_q)) {
        flite_hw_capture_stop(fimc);
        clear_bit(ST_FLITE_STREAM, &fimc->state);
    }
done:
    set_bit(ST_FLITE_RUN, &fimc->state);
    spin_unlock_irqrestore(&fimc->slock, flags);
    return IRQ_HANDLED;
}

static int start_streaming(struct vb2_queue *q, unsigned int count)
{
    struct fimc_lite *fimc = q->drv_priv;
    int ret;

    fimc->frame_count = 0;

    ret = fimc_lite_hw_init(fimc);
    if (ret) {
        fimc_lite_reinit(fimc, false);
        return ret;
    }

    set_bit(ST_FLITE_PENDING, &fimc->state);

    if (!list_empty(&fimc->active_buf_q) &&
        !test_and_set_bit(ST_FLITE_STREAM, &fimc->state)) {
        flite_hw_capture_start(fimc);

        if (!test_and_set_bit(ST_SENSOR_STREAM, &fimc->state))
            fimc_pipeline_call(fimc, set_stream,
                       &fimc->pipeline, 1);
    }
    if (debug > 0)
        flite_hw_dump_regs(fimc, __func__);

    return 0;
}

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

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

    return fimc_lite_stop_capture(fimc, false);
}

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_lite *fimc = vq->drv_priv;
    struct flite_frame *frame = &fimc->out_frame;
    const struct fimc_fmt *fmt = fimc->fmt;
    unsigned long wh;
    int i;

    if (pfmt) {
        pixm = &pfmt->fmt.pix_mp;
        fmt = fimc_lite_find_format(&pixm->pixelformat, NULL, -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
            sizes[i] = size;
        allocators[i] = fimc->alloc_ctx;
    }

    return 0;
}

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

    if (fimc->fmt == NULL)
        return -EINVAL;

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

        if (vb2_plane_size(vb, i) < size) {
            v4l2_err(&fimc->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 flite_buffer *buf
        = container_of(vb, struct flite_buffer, vb);
    struct fimc_lite *fimc = vb2_get_drv_priv(vb->vb2_queue);
    unsigned long flags;

    spin_lock_irqsave(&fimc->slock, flags);
    buf->paddr = vb2_dma_contig_plane_dma_addr(vb, 0);

    if (!test_bit(ST_FLITE_SUSPENDED, &fimc->state) &&
        !test_bit(ST_FLITE_STREAM, &fimc->state) &&
        list_empty(&fimc->active_buf_q)) {
        flite_hw_set_output_addr(fimc, buf->paddr);
        fimc_lite_active_queue_add(fimc, buf);
    } else {
        fimc_lite_pending_queue_add(fimc, buf);
    }

    if (vb2_is_streaming(&fimc->vb_queue) &&
        !list_empty(&fimc->pending_buf_q) &&
        !test_and_set_bit(ST_FLITE_STREAM, &fimc->state)) {
        flite_hw_capture_start(fimc);
        spin_unlock_irqrestore(&fimc->slock, flags);

        if (!test_and_set_bit(ST_SENSOR_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_lite *fimc = vb2_get_drv_priv(vq);
    mutex_lock(&fimc->lock);
}

static void fimc_unlock(struct vb2_queue *vq)
{
    struct fimc_lite *fimc = vb2_get_drv_priv(vq);
    mutex_unlock(&fimc->lock);
}

static const struct vb2_ops fimc_lite_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,
};

static void fimc_lite_clear_event_counters(struct fimc_lite *fimc)
{
    unsigned long flags;

    spin_lock_irqsave(&fimc->slock, flags);
    memset(&fimc->events, 0, sizeof(fimc->events));
    spin_unlock_irqrestore(&fimc->slock, flags);
}

static int fimc_lite_open(struct file *file)
{
    struct fimc_lite *fimc = video_drvdata(file);
    int ret;

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

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

    ret = v4l2_fh_open(file);
    if (ret < 0)
        goto done;

    if (++fimc->ref_count == 1 && fimc->out_path == FIMC_IO_DMA) {
        ret = fimc_pipeline_call(fimc, open, &fimc->pipeline,
                     &fimc->vfd.entity, true);
        if (ret < 0) {
            pm_runtime_put_sync(&fimc->pdev->dev);
            fimc->ref_count--;
            v4l2_fh_release(file);
            clear_bit(ST_FLITE_IN_USE, &fimc->state);
        }

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

static int fimc_lite_close(struct file *file)
{
    struct fimc_lite *fimc = video_drvdata(file);
    int ret;

    mutex_lock(&fimc->lock);

    if (--fimc->ref_count == 0 && fimc->out_path == FIMC_IO_DMA) {
        clear_bit(ST_FLITE_IN_USE, &fimc->state);
        fimc_lite_stop_capture(fimc, false);
        fimc_pipeline_call(fimc, close, &fimc->pipeline);
        clear_bit(ST_FLITE_SUSPENDED, &fimc->state);
    }

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

    if (fimc->ref_count == 0)
        vb2_queue_release(&fimc->vb_queue);

    ret = v4l2_fh_release(file);

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

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

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

    ret = vb2_poll(&fimc->vb_queue, file, wait);
    mutex_unlock(&fimc->lock);

    return ret;
}

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

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

    ret = vb2_mmap(&fimc->vb_queue, vma);
    mutex_unlock(&fimc->lock);

    return ret;
}

static const struct v4l2_file_operations fimc_lite_fops = {
    .owner      = THIS_MODULE,
    .open       = fimc_lite_open,
    .release    = fimc_lite_close,
    .poll       = fimc_lite_poll,
    .unlocked_ioctl = video_ioctl2,
    .mmap       = fimc_lite_mmap,
};

/*
 * Format and crop negotiation helpers
 */

static const struct fimc_fmt *fimc_lite_try_format(struct fimc_lite *fimc,
                    u32 *width, u32 *height,
                    u32 *code, u32 *fourcc, int pad)
{
    struct flite_variant *variant = fimc->variant;
    const struct fimc_fmt *fmt;

    fmt = fimc_lite_find_format(fourcc, code, 0);
    if (WARN_ON(!fmt))
        return NULL;

    if (code)
        *code = fmt->mbus_code;
    if (fourcc)
        *fourcc = fmt->fourcc;

    if (pad == FLITE_SD_PAD_SINK) {
        v4l_bound_align_image(width, 8, variant->max_width,
                      ffs(variant->out_width_align) - 1,
                      height, 0, variant->max_height, 0, 0);
    } else {
        v4l_bound_align_image(width, 8, fimc->inp_frame.rect.width,
                      ffs(variant->out_width_align) - 1,
                      height, 0, fimc->inp_frame.rect.height,
                      0, 0);
    }

    v4l2_dbg(1, debug, &fimc->subdev, "code: 0x%x, %dx%d\n",
         code ? *code : 0, *width, *height);

    return fmt;
}

static void fimc_lite_try_crop(struct fimc_lite *fimc, struct v4l2_rect *r)
{
    struct flite_frame *frame = &fimc->inp_frame;

    v4l_bound_align_image(&r->width, 0, frame->f_width, 0,
                  &r->height, 0, frame->f_height, 0, 0);

    /* Adjust left/top if cropping rectangle got out of bounds */
    r->left = clamp_t(u32, r->left, 0, frame->f_width - r->width);
    r->left = round_down(r->left, fimc->variant->win_hor_offs_align);
    r->top  = clamp_t(u32, r->top, 0, frame->f_height - r->height);

    v4l2_dbg(1, debug, &fimc->subdev, "(%d,%d)/%dx%d, sink fmt: %dx%d",
         r->left, r->top, r->width, r->height,
         frame->f_width, frame->f_height);
}

static void fimc_lite_try_compose(struct fimc_lite *fimc, struct v4l2_rect *r)
{
    struct flite_frame *frame = &fimc->out_frame;
    struct v4l2_rect *crop_rect = &fimc->inp_frame.rect;

    /* Scaling is not supported so we enforce compose rectangle size
       same as size of the sink crop rectangle. */
    r->width = crop_rect->width;
    r->height = crop_rect->height;

    /* Adjust left/top if the composing rectangle got out of bounds */
    r->left = clamp_t(u32, r->left, 0, frame->f_width - r->width);
    r->left = round_down(r->left, fimc->variant->out_hor_offs_align);
    r->top  = clamp_t(u32, r->top, 0, fimc->out_frame.f_height - r->height);

    v4l2_dbg(1, debug, &fimc->subdev, "(%d,%d)/%dx%d, source fmt: %dx%d",
         r->left, r->top, r->width, r->height,
         frame->f_width, frame->f_height);
}

/*
 * Video node ioctl operations
 */
static int fimc_vidioc_querycap_capture(struct file *file, void *priv,
                    struct v4l2_capability *cap)
{
    strlcpy(cap->driver, FIMC_LITE_DRV_NAME, sizeof(cap->driver));
    cap->bus_info[0] = 0;
    cap->card[0] = 0;
    cap->capabilities = V4L2_CAP_STREAMING;
    return 0;
}

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

    if (f->index >= ARRAY_SIZE(fimc_lite_formats))
        return -EINVAL;

    fmt = &fimc_lite_formats[f->index];
    strlcpy(f->description, fmt->name, sizeof(f->description));
    f->pixelformat = fmt->fourcc;

    return 0;
}

static int fimc_lite_g_fmt_mplane(struct file *file, void *fh,
                  struct v4l2_format *f)
{
    struct fimc_lite *fimc = video_drvdata(file);
    struct v4l2_pix_format_mplane *pixm = &f->fmt.pix_mp;
    struct v4l2_plane_pix_format *plane_fmt = &pixm->plane_fmt[0];
    struct flite_frame *frame = &fimc->out_frame;
    const struct fimc_fmt *fmt = fimc->fmt;

    plane_fmt->bytesperline = (frame->f_width * fmt->depth[0]) / 8;
    plane_fmt->sizeimage = plane_fmt->bytesperline * frame->f_height;

    pixm->num_planes = fmt->memplanes;
    pixm->pixelformat = fmt->fourcc;
    pixm->width = frame->f_width;
    pixm->height = frame->f_height;
    pixm->field = V4L2_FIELD_NONE;
    pixm->colorspace = V4L2_COLORSPACE_JPEG;
    return 0;
}

static int fimc_lite_try_fmt(struct fimc_lite *fimc,
                 struct v4l2_pix_format_mplane *pixm,
                 const struct fimc_fmt **ffmt)
{
    struct flite_variant *variant = fimc->variant;
    u32 bpl = pixm->plane_fmt[0].bytesperline;
    const struct fimc_fmt *fmt;

    fmt = fimc_lite_find_format(&pixm->pixelformat, NULL, 0);
    if (WARN_ON(fmt == NULL))
        return -EINVAL;
    if (ffmt)
        *ffmt = fmt;
    v4l_bound_align_image(&pixm->width, 8, variant->max_width,
                  ffs(variant->out_width_align) - 1,
                  &pixm->height, 0, variant->max_height, 0, 0);

    if ((bpl == 0 || ((bpl * 8) / fmt->depth[0]) < pixm->width))
        pixm->plane_fmt[0].bytesperline = (pixm->width *
                           fmt->depth[0]) / 8;

    if (pixm->plane_fmt[0].sizeimage == 0)
        pixm->plane_fmt[0].sizeimage = (pixm->width * pixm->height *
                        fmt->depth[0]) / 8;
    pixm->num_planes = fmt->memplanes;
    pixm->pixelformat = fmt->fourcc;
    pixm->colorspace = V4L2_COLORSPACE_JPEG;
    pixm->field = V4L2_FIELD_NONE;
    return 0;
}

static int fimc_lite_try_fmt_mplane(struct file *file, void *fh,
                    struct v4l2_format *f)
{
    struct fimc_lite *fimc = video_drvdata(file);

    return fimc_lite_try_fmt(fimc, &f->fmt.pix_mp, NULL);
}

static int fimc_lite_s_fmt_mplane(struct file *file, void *priv,
                  struct v4l2_format *f)
{
    struct v4l2_pix_format_mplane *pixm = &f->fmt.pix_mp;
    struct fimc_lite *fimc = video_drvdata(file);
    struct flite_frame *frame = &fimc->out_frame;
    const struct fimc_fmt *fmt = NULL;
    int ret;

    if (vb2_is_busy(&fimc->vb_queue))
        return -EBUSY;

    ret = fimc_lite_try_fmt(fimc, &f->fmt.pix_mp, &fmt);
    if (ret < 0)
        return ret;

    fimc->fmt = fmt;
    fimc->payload[0] = max((pixm->width * pixm->height * fmt->depth[0]) / 8,
                   pixm->plane_fmt[0].sizeimage);
    frame->f_width = pixm->width;
    frame->f_height = pixm->height;

    return 0;
}

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

    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->subdev) {
            struct flite_frame *ff = &fimc->out_frame;
            sink_fmt.format.width = ff->f_width;
            sink_fmt.format.height = ff->f_height;
            sink_fmt.format.code = fimc->fmt->mbus_code;
        } 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;
    }
    return 0;
}

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

    if (fimc_lite_active(fimc))
        return -EBUSY;

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

    ret = fimc_pipeline_validate(fimc);
    if (ret) {
        media_entity_pipeline_stop(&sensor->entity);
        return ret;
    }

    return vb2_streamon(&fimc->vb_queue, type);
}

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

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

static int fimc_lite_reqbufs(struct file *file, void *priv,
                 struct v4l2_requestbuffers *reqbufs)
{
    struct fimc_lite *fimc = video_drvdata(file);
    int ret;

    reqbufs->count = max_t(u32, FLITE_REQ_BUFS_MIN, reqbufs->count);
    ret = vb2_reqbufs(&fimc->vb_queue, reqbufs);
    if (!ret)
        fimc->reqbufs_count = reqbufs->count;

    return ret;
}

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

    return vb2_querybuf(&fimc->vb_queue, buf);
}

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

    return vb2_qbuf(&fimc->vb_queue, buf);
}

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

    return vb2_dqbuf(&fimc->vb_queue, buf, file->f_flags & O_NONBLOCK);
}

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

    return vb2_create_bufs(&fimc->vb_queue, create);
}

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

    return vb2_prepare_buf(&fimc->vb_queue, b);
}

/* 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_lite_g_selection(struct file *file, void *fh,
                 struct v4l2_selection *sel)
{
    struct fimc_lite *fimc = video_drvdata(file);
    struct flite_frame *f = &fimc->out_frame;

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

    switch (sel->target) {
    case V4L2_SEL_TGT_COMPOSE_BOUNDS:
    case V4L2_SEL_TGT_COMPOSE_DEFAULT:
        sel->r.left = 0;
        sel->r.top = 0;
        sel->r.width = f->f_width;
        sel->r.height = f->f_height;
        return 0;

    case V4L2_SEL_TGT_COMPOSE:
        sel->r = f->rect;
        return 0;
    }

    return -EINVAL;
}

static int fimc_lite_s_selection(struct file *file, void *fh,
                 struct v4l2_selection *sel)
{
    struct fimc_lite *fimc = video_drvdata(file);
    struct flite_frame *f = &fimc->out_frame;
    struct v4l2_rect rect = sel->r;
    unsigned long flags;

    if (sel->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
        sel->target != V4L2_SEL_TGT_COMPOSE)
        return -EINVAL;

    fimc_lite_try_compose(fimc, &rect);

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

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

    sel->r = rect;
    spin_lock_irqsave(&fimc->slock, flags);
    f->rect = rect;
    set_bit(ST_FLITE_CONFIG, &fimc->state);
    spin_unlock_irqrestore(&fimc->slock, flags);

    return 0;
}

static const struct v4l2_ioctl_ops fimc_lite_ioctl_ops = {
    .vidioc_querycap        = fimc_vidioc_querycap_capture,
    .vidioc_enum_fmt_vid_cap_mplane = fimc_lite_enum_fmt_mplane,
    .vidioc_try_fmt_vid_cap_mplane  = fimc_lite_try_fmt_mplane,
    .vidioc_s_fmt_vid_cap_mplane    = fimc_lite_s_fmt_mplane,
    .vidioc_g_fmt_vid_cap_mplane    = fimc_lite_g_fmt_mplane,
    .vidioc_g_selection     = fimc_lite_g_selection,
    .vidioc_s_selection     = fimc_lite_s_selection,
    .vidioc_reqbufs         = fimc_lite_reqbufs,
    .vidioc_querybuf        = fimc_lite_querybuf,
    .vidioc_prepare_buf     = fimc_lite_prepare_buf,
    .vidioc_create_bufs     = fimc_lite_create_bufs,
    .vidioc_qbuf            = fimc_lite_qbuf,
    .vidioc_dqbuf           = fimc_lite_dqbuf,
    .vidioc_streamon        = fimc_lite_streamon,
    .vidioc_streamoff       = fimc_lite_streamoff,
};

/* Capture subdev media entity operations */
static int fimc_lite_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_lite *fimc = v4l2_get_subdevdata(sd);
    unsigned int remote_ent_type = media_entity_type(remote->entity);

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

    v4l2_dbg(1, debug, sd, "%s: %s --> %s, flags: 0x%x. source_id: 0x%x",
         __func__, local->entity->name, remote->entity->name,
         flags, fimc->source_subdev_grp_id);

    switch (local->index) {
    case FIMC_SD_PAD_SINK:
        if (remote_ent_type != MEDIA_ENT_T_V4L2_SUBDEV)
            return -EINVAL;

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

        fimc->source_subdev_grp_id = 0;
        break;

    case FIMC_SD_PAD_SOURCE:
        if (!(flags & MEDIA_LNK_FL_ENABLED)) {
            fimc->out_path = FIMC_IO_NONE;
            return 0;
        }
        if (remote_ent_type == MEDIA_ENT_T_V4L2_SUBDEV)
            fimc->out_path = FIMC_IO_ISP;
        else
            fimc->out_path = FIMC_IO_DMA;
        break;

    default:
        v4l2_err(sd, "Invalid pad index\n");
        return -EINVAL;
    }

    return 0;
}

static const struct media_entity_operations fimc_lite_subdev_media_ops = {
    .link_setup = fimc_lite_link_setup,
};

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

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

static int fimc_lite_subdev_get_fmt(struct v4l2_subdev *sd,
                    struct v4l2_subdev_fh *fh,
                    struct v4l2_subdev_format *fmt)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *mf = &fmt->format;
    struct flite_frame *f = &fimc->out_frame;

    if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
        mf = v4l2_subdev_get_try_format(fh, fmt->pad);
        fmt->format = *mf;
        return 0;
    }
    mf->colorspace = V4L2_COLORSPACE_JPEG;

    mutex_lock(&fimc->lock);
    mf->code = fimc->fmt->mbus_code;

    if (fmt->pad == FLITE_SD_PAD_SINK) {
        /* full camera input frame size */
        mf->width = f->f_width;
        mf->height = f->f_height;
    } else {
        /* crop size */
        mf->width = f->rect.width;
        mf->height = f->rect.height;
    }
    mutex_unlock(&fimc->lock);
    return 0;
}

static int fimc_lite_subdev_set_fmt(struct v4l2_subdev *sd,
                    struct v4l2_subdev_fh *fh,
                    struct v4l2_subdev_format *fmt)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);
    struct v4l2_mbus_framefmt *mf = &fmt->format;
    struct flite_frame *sink = &fimc->inp_frame;
    struct flite_frame *source = &fimc->out_frame;
    const struct fimc_fmt *ffmt;

    v4l2_dbg(1, debug, sd, "pad%d: code: 0x%x, %dx%d",
         fmt->pad, mf->code, mf->width, mf->height);

    mf->colorspace = V4L2_COLORSPACE_JPEG;
    mutex_lock(&fimc->lock);

    if ((fimc->out_path == FIMC_IO_ISP && sd->entity.stream_count > 0) ||
        (fimc->out_path == FIMC_IO_DMA && vb2_is_busy(&fimc->vb_queue))) {
        mutex_unlock(&fimc->lock);
        return -EBUSY;
    }

    ffmt = fimc_lite_try_format(fimc, &mf->width, &mf->height,
                    &mf->code, NULL, fmt->pad);

    if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
        mf = v4l2_subdev_get_try_format(fh, fmt->pad);
        *mf = fmt->format;
        mutex_unlock(&fimc->lock);
        return 0;
    }

    if (fmt->pad == FLITE_SD_PAD_SINK) {
        sink->f_width = mf->width;
        sink->f_height = mf->height;
        fimc->fmt = ffmt;
        /* Set sink crop rectangle */
        sink->rect.width = mf->width;
        sink->rect.height = mf->height;
        sink->rect.left = 0;
        sink->rect.top = 0;
        /* Reset source format and crop rectangle */
        source->rect = sink->rect;
        source->f_width = mf->width;
        source->f_height = mf->height;
    } else {
        /* Allow changing format only on sink pad */
        mf->code = fimc->fmt->mbus_code;
        mf->width = sink->rect.width;
        mf->height = sink->rect.height;
    }

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

static int fimc_lite_subdev_get_selection(struct v4l2_subdev *sd,
                      struct v4l2_subdev_fh *fh,
                      struct v4l2_subdev_selection *sel)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);
    struct flite_frame *f = &fimc->inp_frame;

    if ((sel->target != V4L2_SEL_TGT_CROP &&
         sel->target != V4L2_SEL_TGT_CROP_BOUNDS) ||
         sel->pad != FLITE_SD_PAD_SINK)
        return -EINVAL;

    if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
        sel->r = *v4l2_subdev_get_try_crop(fh, sel->pad);
        return 0;
    }

    mutex_lock(&fimc->lock);
    if (sel->target == V4L2_SEL_TGT_CROP) {
        sel->r = f->rect;
    } else {
        sel->r.left = 0;
        sel->r.top = 0;
        sel->r.width = f->f_width;
        sel->r.height = f->f_height;
    }
    mutex_unlock(&fimc->lock);

    v4l2_dbg(1, debug, sd, "%s: (%d,%d) %dx%d, f_w: %d, f_h: %d",
         __func__, f->rect.left, f->rect.top, f->rect.width,
         f->rect.height, f->f_width, f->f_height);

    return 0;
}

static int fimc_lite_subdev_set_selection(struct v4l2_subdev *sd,
                      struct v4l2_subdev_fh *fh,
                      struct v4l2_subdev_selection *sel)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);
    struct flite_frame *f = &fimc->inp_frame;
    int ret = 0;

    if (sel->target != V4L2_SEL_TGT_CROP || sel->pad != FLITE_SD_PAD_SINK)
        return -EINVAL;

    mutex_lock(&fimc->lock);
    fimc_lite_try_crop(fimc, &sel->r);

    if (sel->which == V4L2_SUBDEV_FORMAT_TRY) {
        *v4l2_subdev_get_try_crop(fh, sel->pad) = sel->r;
    } else {
        unsigned long flags;
        spin_lock_irqsave(&fimc->slock, flags);
        f->rect = sel->r;
        /* Same crop rectangle on the source pad */
        fimc->out_frame.rect = sel->r;
        set_bit(ST_FLITE_CONFIG, &fimc->state);
        spin_unlock_irqrestore(&fimc->slock, flags);
    }
    mutex_unlock(&fimc->lock);

    v4l2_dbg(1, debug, sd, "%s: (%d,%d) %dx%d, f_w: %d, f_h: %d",
         __func__, f->rect.left, f->rect.top, f->rect.width,
         f->rect.height, f->f_width, f->f_height);

    return ret;
}

static int fimc_lite_subdev_s_stream(struct v4l2_subdev *sd, int on)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);

    if (fimc->out_path == FIMC_IO_DMA)
        return -ENOIOCTLCMD;

    /* TODO: */

    return 0;
}

static int fimc_lite_subdev_s_power(struct v4l2_subdev *sd, int on)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);

    if (fimc->out_path == FIMC_IO_DMA)
        return -ENOIOCTLCMD;

    /* TODO: */

    return 0;
}

static int fimc_lite_log_status(struct v4l2_subdev *sd)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);

    flite_hw_dump_regs(fimc, __func__);
    return 0;
}

static int fimc_lite_subdev_registered(struct v4l2_subdev *sd)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);
    struct vb2_queue *q = &fimc->vb_queue;
    struct video_device *vfd = &fimc->vfd;
    int ret;

    memset(vfd, 0, sizeof(*vfd));

    fimc->fmt = &fimc_lite_formats[0];
    fimc->out_path = FIMC_IO_DMA;

    snprintf(vfd->name, sizeof(vfd->name), "fimc-lite.%d.capture",
         fimc->index);

    vfd->fops = &fimc_lite_fops;
    vfd->ioctl_ops = &fimc_lite_ioctl_ops;
    vfd->v4l2_dev = sd->v4l2_dev;
    vfd->minor = -1;
    vfd->release = video_device_release_empty;
    vfd->lock = &fimc->lock;
    fimc->ref_count = 0;
    fimc->reqbufs_count = 0;

    INIT_LIST_HEAD(&fimc->pending_buf_q);
    INIT_LIST_HEAD(&fimc->active_buf_q);

    memset(q, 0, sizeof(*q));
    q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
    q->io_modes = VB2_MMAP | VB2_USERPTR;
    q->ops = &fimc_lite_qops;
    q->mem_ops = &vb2_dma_contig_memops;
    q->buf_struct_size = sizeof(struct flite_buffer);
    q->drv_priv = fimc;

    ret = vb2_queue_init(q);
    if (ret < 0)
        return ret;

    fimc->vd_pad.flags = MEDIA_PAD_FL_SINK;
    ret = media_entity_init(&vfd->entity, 1, &fimc->vd_pad, 0);
    if (ret < 0)
        return ret;

    video_set_drvdata(vfd, fimc);
    fimc->pipeline_ops = v4l2_get_subdev_hostdata(sd);

    ret = video_register_device(vfd, VFL_TYPE_GRABBER, -1);
    if (ret < 0) {
        media_entity_cleanup(&vfd->entity);
        fimc->pipeline_ops = NULL;
        return ret;
    }

    v4l2_info(sd->v4l2_dev, "Registered %s as /dev/%s\n",
          vfd->name, video_device_node_name(vfd));
    return 0;
}

static void fimc_lite_subdev_unregistered(struct v4l2_subdev *sd)
{
    struct fimc_lite *fimc = v4l2_get_subdevdata(sd);

    if (fimc == NULL)
        return;

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

static const struct v4l2_subdev_internal_ops fimc_lite_subdev_internal_ops = {
    .registered = fimc_lite_subdev_registered,
    .unregistered = fimc_lite_subdev_unregistered,
};

static const struct v4l2_subdev_pad_ops fimc_lite_subdev_pad_ops = {
    .enum_mbus_code = fimc_lite_subdev_enum_mbus_code,
    .get_selection = fimc_lite_subdev_get_selection,
    .set_selection = fimc_lite_subdev_set_selection,
    .get_fmt = fimc_lite_subdev_get_fmt,
    .set_fmt = fimc_lite_subdev_set_fmt,
};

static const struct v4l2_subdev_video_ops fimc_lite_subdev_video_ops = {
    .s_stream = fimc_lite_subdev_s_stream,
};

static const struct v4l2_subdev_core_ops fimc_lite_core_ops = {
    .s_power = fimc_lite_subdev_s_power,
    .log_status = fimc_lite_log_status,
};

static struct v4l2_subdev_ops fimc_lite_subdev_ops = {
    .core = &fimc_lite_core_ops,
    .video = &fimc_lite_subdev_video_ops,
    .pad = &fimc_lite_subdev_pad_ops,
};

static int fimc_lite_s_ctrl(struct v4l2_ctrl *ctrl)
{
    struct fimc_lite *fimc = container_of(ctrl->handler, struct fimc_lite,
                          ctrl_handler);
    set_bit(ST_FLITE_CONFIG, &fimc->state);
    return 0;
}

static const struct v4l2_ctrl_ops fimc_lite_ctrl_ops = {
    .s_ctrl = fimc_lite_s_ctrl,
};

static const struct v4l2_ctrl_config fimc_lite_ctrl = {
    .ops    = &fimc_lite_ctrl_ops,
    .id = V4L2_CTRL_CLASS_USER | 0x1001,
    .type   = V4L2_CTRL_TYPE_BOOLEAN,
    .name   = "Test Pattern 640x480",
};

static int fimc_lite_create_capture_subdev(struct fimc_lite *fimc)
{
    struct v4l2_ctrl_handler *handler = &fimc->ctrl_handler;
    struct v4l2_subdev *sd = &fimc->subdev;
    int ret;

    v4l2_subdev_init(sd, &fimc_lite_subdev_ops);
    sd->flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
    snprintf(sd->name, sizeof(sd->name), "FIMC-LITE.%d", fimc->index);

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

    v4l2_ctrl_handler_init(handler, 1);
    fimc->test_pattern = v4l2_ctrl_new_custom(handler, &fimc_lite_ctrl,
                          NULL);
    if (handler->error) {
        media_entity_cleanup(&sd->entity);
        return handler->error;
    }

    sd->ctrl_handler = handler;
    sd->internal_ops = &fimc_lite_subdev_internal_ops;
    sd->entity.ops = &fimc_lite_subdev_media_ops;
    v4l2_set_subdevdata(sd, fimc);

    return 0;
}

static void fimc_lite_unregister_capture_subdev(struct fimc_lite *fimc)
{
    struct v4l2_subdev *sd = &fimc->subdev;

    v4l2_device_unregister_subdev(sd);
    media_entity_cleanup(&sd->entity);
    v4l2_ctrl_handler_free(&fimc->ctrl_handler);
    v4l2_set_subdevdata(sd, NULL);
}

static void fimc_lite_clk_put(struct fimc_lite *fimc)
{
    if (IS_ERR_OR_NULL(fimc->clock))
        return;

    clk_unprepare(fimc->clock);
    clk_put(fimc->clock);
    fimc->clock = NULL;
}

static int fimc_lite_clk_get(struct fimc_lite *fimc)
{
    int ret;

    fimc->clock = clk_get(&fimc->pdev->dev, FLITE_CLK_NAME);
    if (IS_ERR(fimc->clock))
        return PTR_ERR(fimc->clock);

    ret = clk_prepare(fimc->clock);
    if (ret < 0) {
        clk_put(fimc->clock);
        fimc->clock = NULL;
    }
    return ret;
}

static int __devinit fimc_lite_probe(struct platform_device *pdev)
{
    struct flite_drvdata *drv_data = fimc_lite_get_drvdata(pdev);
    struct fimc_lite *fimc;
    struct resource *res;
    int ret;

    fimc = devm_kzalloc(&pdev->dev, sizeof(*fimc), GFP_KERNEL);
    if (!fimc)
        return -ENOMEM;

    fimc->index = pdev->id;
    fimc->variant = drv_data->variant[fimc->index];
    fimc->pdev = pdev;

    init_waitqueue_head(&fimc->irq_queue);
    spin_lock_init(&fimc->slock);
    mutex_init(&fimc->lock);

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    fimc->regs = devm_request_and_ioremap(&pdev->dev, res);
    if (fimc->regs == NULL) {
        dev_err(&pdev->dev, "Failed to obtain io memory\n");
        return -ENOENT;
    }

    res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
    if (res == NULL) {
        dev_err(&pdev->dev, "Failed to get IRQ resource\n");
        return -ENXIO;
    }

    ret = fimc_lite_clk_get(fimc);
    if (ret)
        return ret;

    ret = devm_request_irq(&pdev->dev, res->start, flite_irq_handler,
                   0, dev_name(&pdev->dev), fimc);
    if (ret) {
        dev_err(&pdev->dev, "Failed to install irq (%d)\n", ret);
        goto err_clk;
    }

    /* The video node will be created within the subdev's registered() op */
    ret = fimc_lite_create_capture_subdev(fimc);
    if (ret)
        goto err_clk;

    platform_set_drvdata(pdev, fimc);
    pm_runtime_enable(&pdev->dev);
    ret = pm_runtime_get_sync(&pdev->dev);
    if (ret < 0)
        goto err_sd;

    fimc->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
    if (IS_ERR(fimc->alloc_ctx)) {
        ret = PTR_ERR(fimc->alloc_ctx);
        goto err_pm;
    }
    pm_runtime_put(&pdev->dev);

    dev_dbg(&pdev->dev, "FIMC-LITE.%d registered successfully\n",
        fimc->index);
    return 0;
err_pm:
    pm_runtime_put(&pdev->dev);
err_sd:
    fimc_lite_unregister_capture_subdev(fimc);
err_clk:
    fimc_lite_clk_put(fimc);
    return ret;
}

static int fimc_lite_runtime_resume(struct device *dev)
{
    struct fimc_lite *fimc = dev_get_drvdata(dev);

    clk_enable(fimc->clock);
    return 0;
}

static int fimc_lite_runtime_suspend(struct device *dev)
{
    struct fimc_lite *fimc = dev_get_drvdata(dev);

    clk_disable(fimc->clock);
    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int fimc_lite_resume(struct device *dev)
{
    struct fimc_lite *fimc = dev_get_drvdata(dev);
    struct flite_buffer *buf;
    unsigned long flags;
    int i;

    spin_lock_irqsave(&fimc->slock, flags);
    if (!test_and_clear_bit(ST_LPM, &fimc->state) ||
        !test_bit(ST_FLITE_IN_USE, &fimc->state)) {
        spin_unlock_irqrestore(&fimc->slock, flags);
        return 0;
    }
    flite_hw_reset(fimc);
    spin_unlock_irqrestore(&fimc->slock, flags);

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

    INIT_LIST_HEAD(&fimc->active_buf_q);
    fimc_pipeline_call(fimc, open, &fimc->pipeline,
               &fimc->vfd.entity, false);
    fimc_lite_hw_init(fimc);
    clear_bit(ST_FLITE_SUSPENDED, &fimc->state);

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

static int fimc_lite_suspend(struct device *dev)
{
    struct fimc_lite *fimc = dev_get_drvdata(dev);
    bool suspend = test_bit(ST_FLITE_IN_USE, &fimc->state);
    int ret;

    if (test_and_set_bit(ST_LPM, &fimc->state))
        return 0;

    ret = fimc_lite_stop_capture(fimc, suspend);
    if (ret < 0 || !fimc_lite_active(fimc))
        return ret;

    return fimc_pipeline_call(fimc, close, &fimc->pipeline);
}
#endif /* CONFIG_PM_SLEEP */

static int __devexit fimc_lite_remove(struct platform_device *pdev)
{
    struct fimc_lite *fimc = platform_get_drvdata(pdev);
    struct device *dev = &pdev->dev;

    pm_runtime_disable(dev);
    pm_runtime_set_suspended(dev);
    fimc_lite_unregister_capture_subdev(fimc);
    vb2_dma_contig_cleanup_ctx(fimc->alloc_ctx);
    fimc_lite_clk_put(fimc);

    dev_info(dev, "Driver unloaded\n");
    return 0;
}

static struct flite_variant fimc_lite0_variant_exynos4 = {
    .max_width      = 8192,
    .max_height     = 8192,
    .out_width_align    = 8,
    .win_hor_offs_align = 2,
    .out_hor_offs_align = 8,
};

/* EXYNOS4212, EXYNOS4412 */
static struct flite_drvdata fimc_lite_drvdata_exynos4 = {
    .variant = {
        [0] = &fimc_lite0_variant_exynos4,
        [1] = &fimc_lite0_variant_exynos4,
    },
};

static struct platform_device_id fimc_lite_driver_ids[] = {
    {
        .name       = "exynos-fimc-lite",
        .driver_data    = (unsigned long)&fimc_lite_drvdata_exynos4,
    },
    { /* sentinel */ },
};
MODULE_DEVICE_TABLE(platform, fimc_lite_driver_ids);

static const struct dev_pm_ops fimc_lite_pm_ops = {
    SET_SYSTEM_SLEEP_PM_OPS(fimc_lite_suspend, fimc_lite_resume)
    SET_RUNTIME_PM_OPS(fimc_lite_runtime_suspend, fimc_lite_runtime_resume,
               NULL)
};

static struct platform_driver fimc_lite_driver = {
    .probe      = fimc_lite_probe,
    .remove     = __devexit_p(fimc_lite_remove),
    .id_table   = fimc_lite_driver_ids,
    .driver = {
        .name       = FIMC_LITE_DRV_NAME,
        .owner      = THIS_MODULE,
        .pm     = &fimc_lite_pm_ops,
    }
};
module_platform_driver(fimc_lite_driver);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" FIMC_LITE_DRV_NAME);