// SPDX-License-Identifier: GPL-2.0
/*
 * SuperH Video Output Unit (VOU) driver
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 */

#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/module.h>

#include <media/drv-intf/sh_vou.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mediabus.h>
#include <media/videobuf2-v4l2.h>
#include <media/videobuf2-dma-contig.h>

/* Mirror addresses are not available for all registers */
#define VOUER   0
#define VOUCR   4
#define VOUSTR  8
#define VOUVCR  0xc
#define VOUISR  0x10
#define VOUBCR  0x14
#define VOUDPR  0x18
#define VOUDSR  0x1c
#define VOUVPR  0x20
#define VOUIR   0x24
#define VOUSRR  0x28
#define VOUMSR  0x2c
#define VOUHIR  0x30
#define VOUDFR  0x34
#define VOUAD1R 0x38
#define VOUAD2R 0x3c
#define VOUAIR  0x40
#define VOUSWR  0x44
#define VOURCR  0x48
#define VOURPR  0x50

enum sh_vou_status {
        SH_VOU_IDLE,
        SH_VOU_INITIALISING,
        SH_VOU_RUNNING,
};

#define VOU_MIN_IMAGE_WIDTH     16
#define VOU_MAX_IMAGE_WIDTH     720
#define VOU_MIN_IMAGE_HEIGHT    16

struct sh_vou_buffer {
        struct vb2_v4l2_buffer vb;
        struct list_head list;
};

static inline struct
sh_vou_buffer *to_sh_vou_buffer(struct vb2_v4l2_buffer *vb2)
{
        return container_of(vb2, struct sh_vou_buffer, vb);
}

struct sh_vou_device {
        struct v4l2_device v4l2_dev;
        struct video_device vdev;
        struct sh_vou_pdata *pdata;
        spinlock_t lock;
        void __iomem *base;
        /* State information */
        struct v4l2_pix_format pix;
        struct v4l2_rect rect;
        struct list_head buf_list;
        v4l2_std_id std;
        int pix_idx;
        struct vb2_queue queue;
        struct sh_vou_buffer *active;
        enum sh_vou_status status;
        unsigned sequence;
        struct mutex fop_lock;
};

/* Register access routines for sides A, B and mirror addresses */
static void sh_vou_reg_a_write(struct sh_vou_device *vou_dev, unsigned int reg,
                               u32 value)
{
        __raw_writel(value, vou_dev->base + reg);
}

static void sh_vou_reg_ab_write(struct sh_vou_device *vou_dev, unsigned int reg,
                                u32 value)
{
        __raw_writel(value, vou_dev->base + reg);
        __raw_writel(value, vou_dev->base + reg + 0x1000);
}

static void sh_vou_reg_m_write(struct sh_vou_device *vou_dev, unsigned int reg,
                               u32 value)
{
        __raw_writel(value, vou_dev->base + reg + 0x2000);
}

static u32 sh_vou_reg_a_read(struct sh_vou_device *vou_dev, unsigned int reg)
{
        return __raw_readl(vou_dev->base + reg);
}

static void sh_vou_reg_a_set(struct sh_vou_device *vou_dev, unsigned int reg,
                             u32 value, u32 mask)
{
        u32 old = __raw_readl(vou_dev->base + reg);

        value = (value & mask) | (old & ~mask);
        __raw_writel(value, vou_dev->base + reg);
}

static void sh_vou_reg_b_set(struct sh_vou_device *vou_dev, unsigned int reg,
                             u32 value, u32 mask)
{
        sh_vou_reg_a_set(vou_dev, reg + 0x1000, value, mask);
}

static void sh_vou_reg_ab_set(struct sh_vou_device *vou_dev, unsigned int reg,
                              u32 value, u32 mask)
{
        sh_vou_reg_a_set(vou_dev, reg, value, mask);
        sh_vou_reg_b_set(vou_dev, reg, value, mask);
}

struct sh_vou_fmt {
        u32             pfmt;
        unsigned char   bpp;
        unsigned char   bpl;
        unsigned char   rgb;
        unsigned char   yf;
        unsigned char   pkf;
};

/* Further pixel formats can be added */
static struct sh_vou_fmt vou_fmt[] = {
        {
                .pfmt   = V4L2_PIX_FMT_NV12,
                .bpp    = 12,
                .bpl    = 1,
                .yf     = 0,
                .rgb    = 0,
        },
        {
                .pfmt   = V4L2_PIX_FMT_NV16,
                .bpp    = 16,
                .bpl    = 1,
                .yf     = 1,
                .rgb    = 0,
        },
        {
                .pfmt   = V4L2_PIX_FMT_RGB24,
                .bpp    = 24,
                .bpl    = 3,
                .pkf    = 2,
                .rgb    = 1,
        },
        {
                .pfmt   = V4L2_PIX_FMT_RGB565,
                .bpp    = 16,
                .bpl    = 2,
                .pkf    = 3,
                .rgb    = 1,
        },
        {
                .pfmt   = V4L2_PIX_FMT_RGB565X,
                .bpp    = 16,
                .bpl    = 2,
                .pkf    = 3,
                .rgb    = 1,
        },
};

static void sh_vou_schedule_next(struct sh_vou_device *vou_dev,
                                 struct vb2_v4l2_buffer *vbuf)
{
        dma_addr_t addr1, addr2;

        addr1 = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0);
        switch (vou_dev->pix.pixelformat) {
        case V4L2_PIX_FMT_NV12:
        case V4L2_PIX_FMT_NV16:
                addr2 = addr1 + vou_dev->pix.width * vou_dev->pix.height;
                break;
        default:
                addr2 = 0;
        }

        sh_vou_reg_m_write(vou_dev, VOUAD1R, addr1);
        sh_vou_reg_m_write(vou_dev, VOUAD2R, addr2);
}

static void sh_vou_stream_config(struct sh_vou_device *vou_dev)
{
        unsigned int row_coeff;
#ifdef __LITTLE_ENDIAN
        u32 dataswap = 7;
#else
        u32 dataswap = 0;
#endif

        switch (vou_dev->pix.pixelformat) {
        default:
        case V4L2_PIX_FMT_NV12:
        case V4L2_PIX_FMT_NV16:
                row_coeff = 1;
                break;
        case V4L2_PIX_FMT_RGB565:
                dataswap ^= 1;
                fallthrough;
        case V4L2_PIX_FMT_RGB565X:
                row_coeff = 2;
                break;
        case V4L2_PIX_FMT_RGB24:
                row_coeff = 3;
                break;
        }

        sh_vou_reg_a_write(vou_dev, VOUSWR, dataswap);
        sh_vou_reg_ab_write(vou_dev, VOUAIR, vou_dev->pix.width * row_coeff);
}

/* Locking: caller holds fop_lock mutex */
static int sh_vou_queue_setup(struct vb2_queue *vq,
                       unsigned int *nbuffers, unsigned int *nplanes,
                       unsigned int sizes[], struct device *alloc_devs[])
{
        struct sh_vou_device *vou_dev = vb2_get_drv_priv(vq);
        struct v4l2_pix_format *pix = &vou_dev->pix;
        int bytes_per_line = vou_fmt[vou_dev->pix_idx].bpp * pix->width / 8;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        if (*nplanes)
                return sizes[0] < pix->height * bytes_per_line ? -EINVAL : 0;
        *nplanes = 1;
        sizes[0] = pix->height * bytes_per_line;
        return 0;
}

static int sh_vou_buf_prepare(struct vb2_buffer *vb)
{
        struct sh_vou_device *vou_dev = vb2_get_drv_priv(vb->vb2_queue);
        struct v4l2_pix_format *pix = &vou_dev->pix;
        unsigned bytes_per_line = vou_fmt[vou_dev->pix_idx].bpp * pix->width / 8;
        unsigned size = pix->height * bytes_per_line;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        if (vb2_plane_size(vb, 0) < size) {
                /* User buffer too small */
                dev_warn(vou_dev->v4l2_dev.dev, "buffer too small (%lu < %u)\n",
                         vb2_plane_size(vb, 0), size);
                return -EINVAL;
        }

        vb2_set_plane_payload(vb, 0, size);
        return 0;
}

/* Locking: caller holds fop_lock mutex and vq->irqlock spinlock */
static void sh_vou_buf_queue(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct sh_vou_device *vou_dev = vb2_get_drv_priv(vb->vb2_queue);
        struct sh_vou_buffer *shbuf = to_sh_vou_buffer(vbuf);
        unsigned long flags;

        spin_lock_irqsave(&vou_dev->lock, flags);
        list_add_tail(&shbuf->list, &vou_dev->buf_list);
        spin_unlock_irqrestore(&vou_dev->lock, flags);
}

static int sh_vou_start_streaming(struct vb2_queue *vq, unsigned int count)
{
        struct sh_vou_device *vou_dev = vb2_get_drv_priv(vq);
        struct sh_vou_buffer *buf, *node;
        int ret;

        vou_dev->sequence = 0;
        ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0,
                                         video, s_stream, 1);
        if (ret < 0 && ret != -ENOIOCTLCMD) {
                list_for_each_entry_safe(buf, node, &vou_dev->buf_list, list) {
                        vb2_buffer_done(&buf->vb.vb2_buf,
                                        VB2_BUF_STATE_QUEUED);
                        list_del(&buf->list);
                }
                vou_dev->active = NULL;
                return ret;
        }

        buf = list_entry(vou_dev->buf_list.next, struct sh_vou_buffer, list);

        vou_dev->active = buf;

        /* Start from side A: we use mirror addresses, so, set B */
        sh_vou_reg_a_write(vou_dev, VOURPR, 1);
        dev_dbg(vou_dev->v4l2_dev.dev, "%s: first buffer status 0x%x\n",
                __func__, sh_vou_reg_a_read(vou_dev, VOUSTR));
        sh_vou_schedule_next(vou_dev, &buf->vb);

        buf = list_entry(buf->list.next, struct sh_vou_buffer, list);

        /* Second buffer - initialise register side B */
        sh_vou_reg_a_write(vou_dev, VOURPR, 0);
        sh_vou_schedule_next(vou_dev, &buf->vb);

        /* Register side switching with frame VSYNC */
        sh_vou_reg_a_write(vou_dev, VOURCR, 5);

        sh_vou_stream_config(vou_dev);
        /* Enable End-of-Frame (VSYNC) interrupts */
        sh_vou_reg_a_write(vou_dev, VOUIR, 0x10004);

        /* Two buffers on the queue - activate the hardware */
        vou_dev->status = SH_VOU_RUNNING;
        sh_vou_reg_a_write(vou_dev, VOUER, 0x107);
        return 0;
}

static void sh_vou_stop_streaming(struct vb2_queue *vq)
{
        struct sh_vou_device *vou_dev = vb2_get_drv_priv(vq);
        struct sh_vou_buffer *buf, *node;
        unsigned long flags;

        v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0,
                                         video, s_stream, 0);
        /* disable output */
        sh_vou_reg_a_set(vou_dev, VOUER, 0, 1);
        /* ...but the current frame will complete */
        sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x30000);
        msleep(50);
        spin_lock_irqsave(&vou_dev->lock, flags);
        list_for_each_entry_safe(buf, node, &vou_dev->buf_list, list) {
                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
                list_del(&buf->list);
        }
        vou_dev->active = NULL;
        spin_unlock_irqrestore(&vou_dev->lock, flags);
}

static const struct vb2_ops sh_vou_qops = {
        .queue_setup            = sh_vou_queue_setup,
        .buf_prepare            = sh_vou_buf_prepare,
        .buf_queue              = sh_vou_buf_queue,
        .start_streaming        = sh_vou_start_streaming,
        .stop_streaming         = sh_vou_stop_streaming,
        .wait_prepare           = vb2_ops_wait_prepare,
        .wait_finish            = vb2_ops_wait_finish,
};

/* Video IOCTLs */
static int sh_vou_querycap(struct file *file, void  *priv,
                           struct v4l2_capability *cap)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        strscpy(cap->card, "SuperH VOU", sizeof(cap->card));
        strscpy(cap->driver, "sh-vou", sizeof(cap->driver));
        strscpy(cap->bus_info, "platform:sh-vou", sizeof(cap->bus_info));
        return 0;
}

/* Enumerate formats, that the device can accept from the user */
static int sh_vou_enum_fmt_vid_out(struct file *file, void  *priv,
                                   struct v4l2_fmtdesc *fmt)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        if (fmt->index >= ARRAY_SIZE(vou_fmt))
                return -EINVAL;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        fmt->pixelformat = vou_fmt[fmt->index].pfmt;

        return 0;
}

static int sh_vou_g_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        fmt->fmt.pix = vou_dev->pix;

        return 0;
}

static const unsigned char vou_scale_h_num[] = {1, 9, 2, 9, 4};
static const unsigned char vou_scale_h_den[] = {1, 8, 1, 4, 1};
static const unsigned char vou_scale_h_fld[] = {0, 2, 1, 3};
static const unsigned char vou_scale_v_num[] = {1, 2, 4};
static const unsigned char vou_scale_v_den[] = {1, 1, 1};
static const unsigned char vou_scale_v_fld[] = {0, 1};

static void sh_vou_configure_geometry(struct sh_vou_device *vou_dev,
                                      int pix_idx, int w_idx, int h_idx)
{
        struct sh_vou_fmt *fmt = vou_fmt + pix_idx;
        unsigned int black_left, black_top, width_max,
                frame_in_height, frame_out_height, frame_out_top;
        struct v4l2_rect *rect = &vou_dev->rect;
        struct v4l2_pix_format *pix = &vou_dev->pix;
        u32 vouvcr = 0, dsr_h, dsr_v;

        if (vou_dev->std & V4L2_STD_525_60) {
                width_max = 858;
                /* height_max = 262; */
        } else {
                width_max = 864;
                /* height_max = 312; */
        }

        frame_in_height = pix->height / 2;
        frame_out_height = rect->height / 2;
        frame_out_top = rect->top / 2;

        /*
         * Cropping scheme: max useful image is 720x480, and the total video
         * area is 858x525 (NTSC) or 864x625 (PAL). AK8813 / 8814 starts
         * sampling data beginning with fixed 276th (NTSC) / 288th (PAL) clock,
         * of which the first 33 / 25 clocks HSYNC must be held active. This
         * has to be configured in CR[HW]. 1 pixel equals 2 clock periods.
         * This gives CR[HW] = 16 / 12, VPR[HVP] = 138 / 144, which gives
         * exactly 858 - 138 = 864 - 144 = 720! We call the out-of-display area,
         * beyond DSR, specified on the left and top by the VPR register "black
         * pixels" and out-of-image area (DPR) "background pixels." We fix VPR
         * at 138 / 144 : 20, because that's the HSYNC timing, that our first
         * client requires, and that's exactly what leaves us 720 pixels for the
         * image; we leave VPR[VVP] at default 20 for now, because the client
         * doesn't seem to have any special requirements for it. Otherwise we
         * could also set it to max - 240 = 22 / 72. Thus VPR depends only on
         * the selected standard, and DPR and DSR are selected according to
         * cropping. Q: how does the client detect the first valid line? Does
         * HSYNC stay inactive during invalid (black) lines?
         */
        black_left = width_max - VOU_MAX_IMAGE_WIDTH;
        black_top = 20;

        dsr_h = rect->width + rect->left;
        dsr_v = frame_out_height + frame_out_top;

        dev_dbg(vou_dev->v4l2_dev.dev,
                "image %ux%u, black %u:%u, offset %u:%u, display %ux%u\n",
                pix->width, frame_in_height, black_left, black_top,
                rect->left, frame_out_top, dsr_h, dsr_v);

        /* VOUISR height - half of a frame height in frame mode */
        sh_vou_reg_ab_write(vou_dev, VOUISR, (pix->width << 16) | frame_in_height);
        sh_vou_reg_ab_write(vou_dev, VOUVPR, (black_left << 16) | black_top);
        sh_vou_reg_ab_write(vou_dev, VOUDPR, (rect->left << 16) | frame_out_top);
        sh_vou_reg_ab_write(vou_dev, VOUDSR, (dsr_h << 16) | dsr_v);

        /*
         * if necessary, we could set VOUHIR to
         * max(black_left + dsr_h, width_max) here
         */

        if (w_idx)
                vouvcr |= (1 << 15) | (vou_scale_h_fld[w_idx - 1] << 4);
        if (h_idx)
                vouvcr |= (1 << 14) | vou_scale_v_fld[h_idx - 1];

        dev_dbg(vou_dev->v4l2_dev.dev, "0x%08x: scaling 0x%x\n",
                fmt->pfmt, vouvcr);

        /* To produce a colour bar for testing set bit 23 of VOUVCR */
        sh_vou_reg_ab_write(vou_dev, VOUVCR, vouvcr);
        sh_vou_reg_ab_write(vou_dev, VOUDFR,
                            fmt->pkf | (fmt->yf << 8) | (fmt->rgb << 16));
}

struct sh_vou_geometry {
        struct v4l2_rect output;
        unsigned int in_width;
        unsigned int in_height;
        int scale_idx_h;
        int scale_idx_v;
};

/*
 * Find input geometry, that we can use to produce output, closest to the
 * requested rectangle, using VOU scaling
 */
static void vou_adjust_input(struct sh_vou_geometry *geo, v4l2_std_id std)
{
        /* The compiler cannot know, that best and idx will indeed be set */
        unsigned int best_err = UINT_MAX, best = 0, img_height_max;
        int i, idx = 0;

        if (std & V4L2_STD_525_60)
                img_height_max = 480;
        else
                img_height_max = 576;

        /* Image width must be a multiple of 4 */
        v4l_bound_align_image(&geo->in_width,
                              VOU_MIN_IMAGE_WIDTH, VOU_MAX_IMAGE_WIDTH, 2,
                              &geo->in_height,
                              VOU_MIN_IMAGE_HEIGHT, img_height_max, 1, 0);

        /* Select scales to come as close as possible to the output image */
        for (i = ARRAY_SIZE(vou_scale_h_num) - 1; i >= 0; i--) {
                unsigned int err;
                unsigned int found = geo->output.width * vou_scale_h_den[i] /
                        vou_scale_h_num[i];

                if (found > VOU_MAX_IMAGE_WIDTH)
                        /* scales increase */
                        break;

                err = abs(found - geo->in_width);
                if (err < best_err) {
                        best_err = err;
                        idx = i;
                        best = found;
                }
                if (!err)
                        break;
        }

        geo->in_width = best;
        geo->scale_idx_h = idx;

        best_err = UINT_MAX;

        /* This loop can be replaced with one division */
        for (i = ARRAY_SIZE(vou_scale_v_num) - 1; i >= 0; i--) {
                unsigned int err;
                unsigned int found = geo->output.height * vou_scale_v_den[i] /
                        vou_scale_v_num[i];

                if (found > img_height_max)
                        /* scales increase */
                        break;

                err = abs(found - geo->in_height);
                if (err < best_err) {
                        best_err = err;
                        idx = i;
                        best = found;
                }
                if (!err)
                        break;
        }

        geo->in_height = best;
        geo->scale_idx_v = idx;
}

/*
 * Find output geometry, that we can produce, using VOU scaling, closest to
 * the requested rectangle
 */
static void vou_adjust_output(struct sh_vou_geometry *geo, v4l2_std_id std)
{
        unsigned int best_err = UINT_MAX, best = geo->in_width,
                width_max, height_max, img_height_max;
        int i, idx_h = 0, idx_v = 0;

        if (std & V4L2_STD_525_60) {
                width_max = 858;
                height_max = 262 * 2;
                img_height_max = 480;
        } else {
                width_max = 864;
                height_max = 312 * 2;
                img_height_max = 576;
        }

        /* Select scales to come as close as possible to the output image */
        for (i = 0; i < ARRAY_SIZE(vou_scale_h_num); i++) {
                unsigned int err;
                unsigned int found = geo->in_width * vou_scale_h_num[i] /
                        vou_scale_h_den[i];

                if (found > VOU_MAX_IMAGE_WIDTH)
                        /* scales increase */
                        break;

                err = abs(found - geo->output.width);
                if (err < best_err) {
                        best_err = err;
                        idx_h = i;
                        best = found;
                }
                if (!err)
                        break;
        }

        geo->output.width = best;
        geo->scale_idx_h = idx_h;
        if (geo->output.left + best > width_max)
                geo->output.left = width_max - best;

        pr_debug("%s(): W %u * %u/%u = %u\n", __func__, geo->in_width,
                 vou_scale_h_num[idx_h], vou_scale_h_den[idx_h], best);

        best_err = UINT_MAX;

        /* This loop can be replaced with one division */
        for (i = 0; i < ARRAY_SIZE(vou_scale_v_num); i++) {
                unsigned int err;
                unsigned int found = geo->in_height * vou_scale_v_num[i] /
                        vou_scale_v_den[i];

                if (found > img_height_max)
                        /* scales increase */
                        break;

                err = abs(found - geo->output.height);
                if (err < best_err) {
                        best_err = err;
                        idx_v = i;
                        best = found;
                }
                if (!err)
                        break;
        }

        geo->output.height = best;
        geo->scale_idx_v = idx_v;
        if (geo->output.top + best > height_max)
                geo->output.top = height_max - best;

        pr_debug("%s(): H %u * %u/%u = %u\n", __func__, geo->in_height,
                 vou_scale_v_num[idx_v], vou_scale_v_den[idx_v], best);
}

static int sh_vou_try_fmt_vid_out(struct file *file, void *priv,
                                  struct v4l2_format *fmt)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct v4l2_pix_format *pix = &fmt->fmt.pix;
        unsigned int img_height_max;
        int pix_idx;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        pix->field = V4L2_FIELD_INTERLACED;
        pix->colorspace = V4L2_COLORSPACE_SMPTE170M;
        pix->ycbcr_enc = pix->quantization = 0;

        for (pix_idx = 0; pix_idx < ARRAY_SIZE(vou_fmt); pix_idx++)
                if (vou_fmt[pix_idx].pfmt == pix->pixelformat)
                        break;

        if (pix_idx == ARRAY_SIZE(vou_fmt))
                return -EINVAL;

        if (vou_dev->std & V4L2_STD_525_60)
                img_height_max = 480;
        else
                img_height_max = 576;

        v4l_bound_align_image(&pix->width,
                              VOU_MIN_IMAGE_WIDTH, VOU_MAX_IMAGE_WIDTH, 2,
                              &pix->height,
                              VOU_MIN_IMAGE_HEIGHT, img_height_max, 1, 0);
        pix->bytesperline = pix->width * vou_fmt[pix_idx].bpl;
        pix->sizeimage = pix->height * ((pix->width * vou_fmt[pix_idx].bpp) >> 3);

        return 0;
}

static int sh_vou_set_fmt_vid_out(struct sh_vou_device *vou_dev,
                                struct v4l2_pix_format *pix)
{
        unsigned int img_height_max;
        struct sh_vou_geometry geo;
        struct v4l2_subdev_format format = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                /* Revisit: is this the correct code? */
                .format.code = MEDIA_BUS_FMT_YUYV8_2X8,
                .format.field = V4L2_FIELD_INTERLACED,
                .format.colorspace = V4L2_COLORSPACE_SMPTE170M,
        };
        struct v4l2_mbus_framefmt *mbfmt = &format.format;
        int pix_idx;
        int ret;

        if (vb2_is_busy(&vou_dev->queue))
                return -EBUSY;

        for (pix_idx = 0; pix_idx < ARRAY_SIZE(vou_fmt); pix_idx++)
                if (vou_fmt[pix_idx].pfmt == pix->pixelformat)
                        break;

        geo.in_width = pix->width;
        geo.in_height = pix->height;
        geo.output = vou_dev->rect;

        vou_adjust_output(&geo, vou_dev->std);

        mbfmt->width = geo.output.width;
        mbfmt->height = geo.output.height;
        ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, pad,
                                         set_fmt, NULL, &format);
        /* Must be implemented, so, don't check for -ENOIOCTLCMD */
        if (ret < 0)
                return ret;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u -> %ux%u\n", __func__,
                geo.output.width, geo.output.height, mbfmt->width, mbfmt->height);

        if (vou_dev->std & V4L2_STD_525_60)
                img_height_max = 480;
        else
                img_height_max = 576;

        /* Sanity checks */
        if ((unsigned)mbfmt->width > VOU_MAX_IMAGE_WIDTH ||
            (unsigned)mbfmt->height > img_height_max ||
            mbfmt->code != MEDIA_BUS_FMT_YUYV8_2X8)
                return -EIO;

        if (mbfmt->width != geo.output.width ||
            mbfmt->height != geo.output.height) {
                geo.output.width = mbfmt->width;
                geo.output.height = mbfmt->height;

                vou_adjust_input(&geo, vou_dev->std);
        }

        /* We tried to preserve output rectangle, but it could have changed */
        vou_dev->rect = geo.output;
        pix->width = geo.in_width;
        pix->height = geo.in_height;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s(): %ux%u\n", __func__,
                pix->width, pix->height);

        vou_dev->pix_idx = pix_idx;

        vou_dev->pix = *pix;

        sh_vou_configure_geometry(vou_dev, pix_idx,
                                  geo.scale_idx_h, geo.scale_idx_v);

        return 0;
}

static int sh_vou_s_fmt_vid_out(struct file *file, void *priv,
                                struct v4l2_format *fmt)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        int ret = sh_vou_try_fmt_vid_out(file, priv, fmt);

        if (ret)
                return ret;
        return sh_vou_set_fmt_vid_out(vou_dev, &fmt->fmt.pix);
}

static int sh_vou_enum_output(struct file *file, void *fh,
                              struct v4l2_output *a)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        if (a->index)
                return -EINVAL;
        strscpy(a->name, "Video Out", sizeof(a->name));
        a->type = V4L2_OUTPUT_TYPE_ANALOG;
        a->std = vou_dev->vdev.tvnorms;
        return 0;
}

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

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

static u32 sh_vou_ntsc_mode(enum sh_vou_bus_fmt bus_fmt)
{
        switch (bus_fmt) {
        default:
                pr_warn("%s(): Invalid bus-format code %d, using default 8-bit\n",
                        __func__, bus_fmt);
                fallthrough;
        case SH_VOU_BUS_8BIT:
                return 1;
        case SH_VOU_BUS_16BIT:
                return 0;
        case SH_VOU_BUS_BT656:
                return 3;
        }
}

static int sh_vou_s_std(struct file *file, void *priv, v4l2_std_id std_id)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        int ret;

        dev_dbg(vou_dev->v4l2_dev.dev, "%s(): 0x%llx\n", __func__, std_id);

        if (std_id == vou_dev->std)
                return 0;

        if (vb2_is_busy(&vou_dev->queue))
                return -EBUSY;

        ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
                                         s_std_output, std_id);
        /* Shall we continue, if the subdev doesn't support .s_std_output()? */
        if (ret < 0 && ret != -ENOIOCTLCMD)
                return ret;

        vou_dev->rect.top = vou_dev->rect.left = 0;
        vou_dev->rect.width = VOU_MAX_IMAGE_WIDTH;
        if (std_id & V4L2_STD_525_60) {
                sh_vou_reg_ab_set(vou_dev, VOUCR,
                        sh_vou_ntsc_mode(vou_dev->pdata->bus_fmt) << 29, 7 << 29);
                vou_dev->rect.height = 480;
        } else {
                sh_vou_reg_ab_set(vou_dev, VOUCR, 5 << 29, 7 << 29);
                vou_dev->rect.height = 576;
        }

        vou_dev->pix.width = vou_dev->rect.width;
        vou_dev->pix.height = vou_dev->rect.height;
        vou_dev->pix.bytesperline =
                vou_dev->pix.width * vou_fmt[vou_dev->pix_idx].bpl;
        vou_dev->pix.sizeimage = vou_dev->pix.height *
                ((vou_dev->pix.width * vou_fmt[vou_dev->pix_idx].bpp) >> 3);
        vou_dev->std = std_id;
        sh_vou_set_fmt_vid_out(vou_dev, &vou_dev->pix);

        return 0;
}

static int sh_vou_g_std(struct file *file, void *priv, v4l2_std_id *std)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        dev_dbg(vou_dev->v4l2_dev.dev, "%s()\n", __func__);

        *std = vou_dev->std;

        return 0;
}

static int sh_vou_log_status(struct file *file, void *priv)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        pr_info("VOUER:   0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUER));
        pr_info("VOUCR:   0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUCR));
        pr_info("VOUSTR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUSTR));
        pr_info("VOUVCR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUVCR));
        pr_info("VOUISR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUISR));
        pr_info("VOUBCR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUBCR));
        pr_info("VOUDPR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUDPR));
        pr_info("VOUDSR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUDSR));
        pr_info("VOUVPR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUVPR));
        pr_info("VOUIR:   0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUIR));
        pr_info("VOUSRR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUSRR));
        pr_info("VOUMSR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUMSR));
        pr_info("VOUHIR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUHIR));
        pr_info("VOUDFR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUDFR));
        pr_info("VOUAD1R: 0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUAD1R));
        pr_info("VOUAD2R: 0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUAD2R));
        pr_info("VOUAIR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUAIR));
        pr_info("VOUSWR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOUSWR));
        pr_info("VOURCR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOURCR));
        pr_info("VOURPR:  0x%08x\n", sh_vou_reg_a_read(vou_dev, VOURPR));
        return 0;
}

static int sh_vou_g_selection(struct file *file, void *fh,
                              struct v4l2_selection *sel)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

        if (sel->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
                return -EINVAL;
        switch (sel->target) {
        case V4L2_SEL_TGT_COMPOSE:
                sel->r = vou_dev->rect;
                break;
        case V4L2_SEL_TGT_COMPOSE_DEFAULT:
        case V4L2_SEL_TGT_COMPOSE_BOUNDS:
                sel->r.left = 0;
                sel->r.top = 0;
                sel->r.width = VOU_MAX_IMAGE_WIDTH;
                if (vou_dev->std & V4L2_STD_525_60)
                        sel->r.height = 480;
                else
                        sel->r.height = 576;
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

/* Assume a dull encoder, do all the work ourselves. */
static int sh_vou_s_selection(struct file *file, void *fh,
                              struct v4l2_selection *sel)
{
        struct v4l2_rect *rect = &sel->r;
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct v4l2_subdev_selection sd_sel = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                .target = V4L2_SEL_TGT_COMPOSE,
        };
        struct v4l2_pix_format *pix = &vou_dev->pix;
        struct sh_vou_geometry geo;
        struct v4l2_subdev_format format = {
                .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                /* Revisit: is this the correct code? */
                .format.code = MEDIA_BUS_FMT_YUYV8_2X8,
                .format.field = V4L2_FIELD_INTERLACED,
                .format.colorspace = V4L2_COLORSPACE_SMPTE170M,
        };
        unsigned int img_height_max;
        int ret;

        if (sel->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
            sel->target != V4L2_SEL_TGT_COMPOSE)
                return -EINVAL;

        if (vb2_is_busy(&vou_dev->queue))
                return -EBUSY;

        if (vou_dev->std & V4L2_STD_525_60)
                img_height_max = 480;
        else
                img_height_max = 576;

        v4l_bound_align_image(&rect->width,
                              VOU_MIN_IMAGE_WIDTH, VOU_MAX_IMAGE_WIDTH, 1,
                              &rect->height,
                              VOU_MIN_IMAGE_HEIGHT, img_height_max, 1, 0);

        if (rect->width + rect->left > VOU_MAX_IMAGE_WIDTH)
                rect->left = VOU_MAX_IMAGE_WIDTH - rect->width;

        if (rect->height + rect->top > img_height_max)
                rect->top = img_height_max - rect->height;

        geo.output = *rect;
        geo.in_width = pix->width;
        geo.in_height = pix->height;

        /* Configure the encoder one-to-one, position at 0, ignore errors */
        sd_sel.r.width = geo.output.width;
        sd_sel.r.height = geo.output.height;
        /*
         * We first issue a S_SELECTION, so that the subsequent S_FMT delivers the
         * final encoder configuration.
         */
        v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, pad,
                                   set_selection, NULL, &sd_sel);
        format.format.width = geo.output.width;
        format.format.height = geo.output.height;
        ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, pad,
                                         set_fmt, NULL, &format);
        /* Must be implemented, so, don't check for -ENOIOCTLCMD */
        if (ret < 0)
                return ret;

        /* Sanity checks */
        if ((unsigned)format.format.width > VOU_MAX_IMAGE_WIDTH ||
            (unsigned)format.format.height > img_height_max ||
            format.format.code != MEDIA_BUS_FMT_YUYV8_2X8)
                return -EIO;

        geo.output.width = format.format.width;
        geo.output.height = format.format.height;

        /*
         * No down-scaling. According to the API, current call has precedence:
         * https://linuxtv.org/downloads/v4l-dvb-apis/uapi/v4l/crop.html#cropping-structures
         */

        vou_adjust_input(&geo, vou_dev->std);

        /* We tried to preserve output rectangle, but it could have changed */
        vou_dev->rect = geo.output;
        pix->width = geo.in_width;
        pix->height = geo.in_height;

        sh_vou_configure_geometry(vou_dev, vou_dev->pix_idx,
                                  geo.scale_idx_h, geo.scale_idx_v);

        return 0;
}

static irqreturn_t sh_vou_isr(int irq, void *dev_id)
{
        struct sh_vou_device *vou_dev = dev_id;
        static unsigned long j;
        struct sh_vou_buffer *vb;
        static int cnt;
        u32 irq_status = sh_vou_reg_a_read(vou_dev, VOUIR), masked;
        u32 vou_status = sh_vou_reg_a_read(vou_dev, VOUSTR);

        if (!(irq_status & 0x300)) {
                if (printk_timed_ratelimit(&j, 500))
                        dev_warn(vou_dev->v4l2_dev.dev, "IRQ status 0x%x!\n",
                                 irq_status);
                return IRQ_NONE;
        }

        spin_lock(&vou_dev->lock);
        if (!vou_dev->active || list_empty(&vou_dev->buf_list)) {
                if (printk_timed_ratelimit(&j, 500))
                        dev_warn(vou_dev->v4l2_dev.dev,
                                 "IRQ without active buffer: %x!\n", irq_status);
                /* Just ack: buf_release will disable further interrupts */
                sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x300);
                spin_unlock(&vou_dev->lock);
                return IRQ_HANDLED;
        }

        masked = ~(0x300 & irq_status) & irq_status & 0x30304;
        dev_dbg(vou_dev->v4l2_dev.dev,
                "IRQ status 0x%x -> 0x%x, VOU status 0x%x, cnt %d\n",
                irq_status, masked, vou_status, cnt);

        cnt++;
        /* side = vou_status & 0x10000; */

        /* Clear only set interrupts */
        sh_vou_reg_a_write(vou_dev, VOUIR, masked);

        vb = vou_dev->active;
        if (list_is_singular(&vb->list)) {
                /* Keep cycling while no next buffer is available */
                sh_vou_schedule_next(vou_dev, &vb->vb);
                spin_unlock(&vou_dev->lock);
                return IRQ_HANDLED;
        }

        list_del(&vb->list);

        vb->vb.vb2_buf.timestamp = ktime_get_ns();
        vb->vb.sequence = vou_dev->sequence++;
        vb->vb.field = V4L2_FIELD_INTERLACED;
        vb2_buffer_done(&vb->vb.vb2_buf, VB2_BUF_STATE_DONE);

        vou_dev->active = list_entry(vou_dev->buf_list.next,
                                     struct sh_vou_buffer, list);

        if (list_is_singular(&vou_dev->buf_list)) {
                /* Keep cycling while no next buffer is available */
                sh_vou_schedule_next(vou_dev, &vou_dev->active->vb);
        } else {
                struct sh_vou_buffer *new = list_entry(vou_dev->active->list.next,
                                                struct sh_vou_buffer, list);
                sh_vou_schedule_next(vou_dev, &new->vb);
        }

        spin_unlock(&vou_dev->lock);

        return IRQ_HANDLED;
}

static int sh_vou_hw_init(struct sh_vou_device *vou_dev)
{
        struct sh_vou_pdata *pdata = vou_dev->pdata;
        u32 voucr = sh_vou_ntsc_mode(pdata->bus_fmt) << 29;
        int i = 100;

        /* Disable all IRQs */
        sh_vou_reg_a_write(vou_dev, VOUIR, 0);

        /* Reset VOU interfaces - registers unaffected */
        sh_vou_reg_a_write(vou_dev, VOUSRR, 0x101);
        while (--i && (sh_vou_reg_a_read(vou_dev, VOUSRR) & 0x101))
                udelay(1);

        if (!i)
                return -ETIMEDOUT;

        dev_dbg(vou_dev->v4l2_dev.dev, "Reset took %dus\n", 100 - i);

        if (pdata->flags & SH_VOU_PCLK_FALLING)
                voucr |= 1 << 28;
        if (pdata->flags & SH_VOU_HSYNC_LOW)
                voucr |= 1 << 27;
        if (pdata->flags & SH_VOU_VSYNC_LOW)
                voucr |= 1 << 26;
        sh_vou_reg_ab_set(vou_dev, VOUCR, voucr, 0xfc000000);

        /* Manual register side switching at first */
        sh_vou_reg_a_write(vou_dev, VOURCR, 4);
        /* Default - fixed HSYNC length, can be made configurable is required */
        sh_vou_reg_ab_write(vou_dev, VOUMSR, 0x800000);

        sh_vou_set_fmt_vid_out(vou_dev, &vou_dev->pix);

        return 0;
}

/* File operations */
static int sh_vou_open(struct file *file)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        int err;

        if (mutex_lock_interruptible(&vou_dev->fop_lock))
                return -ERESTARTSYS;

        err = v4l2_fh_open(file);
        if (err)
                goto done_open;
        if (v4l2_fh_is_singular_file(file) &&
            vou_dev->status == SH_VOU_INITIALISING) {
                /* First open */
                err = pm_runtime_resume_and_get(vou_dev->v4l2_dev.dev);
                if (err < 0) {
                        v4l2_fh_release(file);
                        goto done_open;
                }
                err = sh_vou_hw_init(vou_dev);
                if (err < 0) {
                        pm_runtime_put(vou_dev->v4l2_dev.dev);
                        v4l2_fh_release(file);
                } else {
                        vou_dev->status = SH_VOU_IDLE;
                }
        }
done_open:
        mutex_unlock(&vou_dev->fop_lock);
        return err;
}

static int sh_vou_release(struct file *file)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        bool is_last;

        mutex_lock(&vou_dev->fop_lock);
        is_last = v4l2_fh_is_singular_file(file);
        _vb2_fop_release(file, NULL);
        if (is_last) {
                /* Last close */
                vou_dev->status = SH_VOU_INITIALISING;
                sh_vou_reg_a_set(vou_dev, VOUER, 0, 0x101);
                pm_runtime_put(vou_dev->v4l2_dev.dev);
        }
        mutex_unlock(&vou_dev->fop_lock);
        return 0;
}

/* sh_vou display ioctl operations */
static const struct v4l2_ioctl_ops sh_vou_ioctl_ops = {
        .vidioc_querycap                = sh_vou_querycap,
        .vidioc_enum_fmt_vid_out        = sh_vou_enum_fmt_vid_out,
        .vidioc_g_fmt_vid_out           = sh_vou_g_fmt_vid_out,
        .vidioc_s_fmt_vid_out           = sh_vou_s_fmt_vid_out,
        .vidioc_try_fmt_vid_out         = sh_vou_try_fmt_vid_out,
        .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
        .vidioc_create_bufs             = vb2_ioctl_create_bufs,
        .vidioc_querybuf                = vb2_ioctl_querybuf,
        .vidioc_qbuf                    = vb2_ioctl_qbuf,
        .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
        .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
        .vidioc_streamon                = vb2_ioctl_streamon,
        .vidioc_streamoff               = vb2_ioctl_streamoff,
        .vidioc_expbuf                  = vb2_ioctl_expbuf,
        .vidioc_g_output                = sh_vou_g_output,
        .vidioc_s_output                = sh_vou_s_output,
        .vidioc_enum_output             = sh_vou_enum_output,
        .vidioc_s_std                   = sh_vou_s_std,
        .vidioc_g_std                   = sh_vou_g_std,
        .vidioc_g_selection             = sh_vou_g_selection,
        .vidioc_s_selection             = sh_vou_s_selection,
        .vidioc_log_status              = sh_vou_log_status,
};

static const struct v4l2_file_operations sh_vou_fops = {
        .owner          = THIS_MODULE,
        .open           = sh_vou_open,
        .release        = sh_vou_release,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vb2_fop_mmap,
        .poll           = vb2_fop_poll,
        .write          = vb2_fop_write,
};

static const struct video_device sh_vou_video_template = {
        .name           = "sh_vou",
        .fops           = &sh_vou_fops,
        .ioctl_ops      = &sh_vou_ioctl_ops,
        .tvnorms        = V4L2_STD_525_60, /* PAL only supported in 8-bit non-bt656 mode */
        .vfl_dir        = VFL_DIR_TX,
        .device_caps    = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_READWRITE |
                          V4L2_CAP_STREAMING,
};

static int sh_vou_probe(struct platform_device *pdev)
{
        struct sh_vou_pdata *vou_pdata = pdev->dev.platform_data;
        struct v4l2_rect *rect;
        struct v4l2_pix_format *pix;
        struct i2c_adapter *i2c_adap;
        struct video_device *vdev;
        struct sh_vou_device *vou_dev;
        struct resource *reg_res;
        struct v4l2_subdev *subdev;
        struct vb2_queue *q;
        int irq, ret;

        reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        irq = platform_get_irq(pdev, 0);

        if (!vou_pdata || !reg_res || irq <= 0) {
                dev_err(&pdev->dev, "Insufficient VOU platform information.\n");
                return -ENODEV;
        }

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

        INIT_LIST_HEAD(&vou_dev->buf_list);
        spin_lock_init(&vou_dev->lock);
        mutex_init(&vou_dev->fop_lock);
        vou_dev->pdata = vou_pdata;
        vou_dev->status = SH_VOU_INITIALISING;
        vou_dev->pix_idx = 1;

        rect = &vou_dev->rect;
        pix = &vou_dev->pix;

        /* Fill in defaults */
        vou_dev->std            = V4L2_STD_NTSC_M;
        rect->left              = 0;
        rect->top               = 0;
        rect->width             = VOU_MAX_IMAGE_WIDTH;
        rect->height            = 480;
        pix->width              = VOU_MAX_IMAGE_WIDTH;
        pix->height             = 480;
        pix->pixelformat        = V4L2_PIX_FMT_NV16;
        pix->field              = V4L2_FIELD_INTERLACED;
        pix->bytesperline       = VOU_MAX_IMAGE_WIDTH;
        pix->sizeimage          = VOU_MAX_IMAGE_WIDTH * 2 * 480;
        pix->colorspace         = V4L2_COLORSPACE_SMPTE170M;

        vou_dev->base = devm_ioremap_resource(&pdev->dev, reg_res);
        if (IS_ERR(vou_dev->base))
                return PTR_ERR(vou_dev->base);

        ret = devm_request_irq(&pdev->dev, irq, sh_vou_isr, 0, "vou", vou_dev);
        if (ret < 0)
                return ret;

        ret = v4l2_device_register(&pdev->dev, &vou_dev->v4l2_dev);
        if (ret < 0) {
                dev_err(&pdev->dev, "Error registering v4l2 device\n");
                return ret;
        }

        vdev = &vou_dev->vdev;
        *vdev = sh_vou_video_template;
        if (vou_pdata->bus_fmt == SH_VOU_BUS_8BIT)
                vdev->tvnorms |= V4L2_STD_PAL;
        vdev->v4l2_dev = &vou_dev->v4l2_dev;
        vdev->release = video_device_release_empty;
        vdev->lock = &vou_dev->fop_lock;

        video_set_drvdata(vdev, vou_dev);

        /* Initialize the vb2 queue */
        q = &vou_dev->queue;
        q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_WRITE;
        q->drv_priv = vou_dev;
        q->buf_struct_size = sizeof(struct sh_vou_buffer);
        q->ops = &sh_vou_qops;
        q->mem_ops = &vb2_dma_contig_memops;
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->min_buffers_needed = 2;
        q->lock = &vou_dev->fop_lock;
        q->dev = &pdev->dev;
        ret = vb2_queue_init(q);
        if (ret)
                goto ei2cgadap;

        vdev->queue = q;
        INIT_LIST_HEAD(&vou_dev->buf_list);

        pm_runtime_enable(&pdev->dev);
        pm_runtime_resume(&pdev->dev);

        i2c_adap = i2c_get_adapter(vou_pdata->i2c_adap);
        if (!i2c_adap) {
                ret = -ENODEV;
                goto ei2cgadap;
        }

        ret = sh_vou_hw_init(vou_dev);
        if (ret < 0)
                goto ereset;

        subdev = v4l2_i2c_new_subdev_board(&vou_dev->v4l2_dev, i2c_adap,
                        vou_pdata->board_info, NULL);
        if (!subdev) {
                ret = -ENOMEM;
                goto ei2cnd;
        }

        ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
        if (ret < 0)
                goto evregdev;

        return 0;

evregdev:
ei2cnd:
ereset:
        i2c_put_adapter(i2c_adap);
ei2cgadap:
        pm_runtime_disable(&pdev->dev);
        v4l2_device_unregister(&vou_dev->v4l2_dev);
        return ret;
}

static int sh_vou_remove(struct platform_device *pdev)
{
        struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
        struct sh_vou_device *vou_dev = container_of(v4l2_dev,
                                                struct sh_vou_device, v4l2_dev);
        struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next,
                                            struct v4l2_subdev, list);
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        pm_runtime_disable(&pdev->dev);
        video_unregister_device(&vou_dev->vdev);
        i2c_put_adapter(client->adapter);
        v4l2_device_unregister(&vou_dev->v4l2_dev);
        return 0;
}

static struct platform_driver sh_vou = {
        .remove  = sh_vou_remove,
        .driver  = {
                .name   = "sh-vou",
        },
};

module_platform_driver_probe(sh_vou, sh_vou_probe);

MODULE_DESCRIPTION("SuperH VOU driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1.0");
MODULE_ALIAS("platform:sh-vou");