/*
 * SuperH Video Output Unit (VOU) driver
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/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/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/videobuf-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_MAX_IMAGE_WIDTH     720
#define VOU_MAX_IMAGE_HEIGHT    576

struct sh_vou_device {
        struct v4l2_device v4l2_dev;
        struct video_device *vdev;
        atomic_t use_count;
        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 queue;
        v4l2_std_id std;
        int pix_idx;
        struct videobuf_buffer *active;
        enum sh_vou_status status;
        struct mutex fop_lock;
};

struct sh_vou_file {
        struct videobuf_queue vbq;
};

/* 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;
        char            *desc;
        unsigned char   bpp;
        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,
                .desc   = "YVU420 planar",
                .yf     = 0,
                .rgb    = 0,
        },
        {
                .pfmt   = V4L2_PIX_FMT_NV16,
                .bpp    = 16,
                .desc   = "YVYU planar",
                .yf     = 1,
                .rgb    = 0,
        },
        {
                .pfmt   = V4L2_PIX_FMT_RGB24,
                .bpp    = 24,
                .desc   = "RGB24",
                .pkf    = 2,
                .rgb    = 1,
        },
        {
                .pfmt   = V4L2_PIX_FMT_RGB565,
                .bpp    = 16,
                .desc   = "RGB565",
                .pkf    = 3,
                .rgb    = 1,
        },
        {
                .pfmt   = V4L2_PIX_FMT_RGB565X,
                .bpp    = 16,
                .desc   = "RGB565 byteswapped",
                .pkf    = 3,
                .rgb    = 1,
        },
};

static void sh_vou_schedule_next(struct sh_vou_device *vou_dev,
                                 struct videobuf_buffer *vb)
{
        dma_addr_t addr1, addr2;

        addr1 = videobuf_to_dma_contig(vb);
        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_start(struct sh_vou_device *vou_dev,
                                struct videobuf_buffer *vb)
{
        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;
        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);
        sh_vou_schedule_next(vou_dev, vb);
}

static void free_buffer(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
        BUG_ON(in_interrupt());

        /* Wait until this buffer is no longer in STATE_QUEUED or STATE_ACTIVE */
        videobuf_waiton(vq, vb, 0, 0);
        videobuf_dma_contig_free(vq, vb);
        vb->state = VIDEOBUF_NEEDS_INIT;
}

/* Locking: caller holds fop_lock mutex */
static int sh_vou_buf_setup(struct videobuf_queue *vq, unsigned int *count,
                            unsigned int *size)
{
        struct video_device *vdev = vq->priv_data;
        struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

        *size = vou_fmt[vou_dev->pix_idx].bpp * vou_dev->pix.width *
                vou_dev->pix.height / 8;

        if (*count < 2)
                *count = 2;

        /* Taking into account maximum frame size, *count will stay >= 2 */
        if (PAGE_ALIGN(*size) * *count > 4 * 1024 * 1024)
                *count = 4 * 1024 * 1024 / PAGE_ALIGN(*size);

        dev_dbg(vou_dev->v4l2_dev.dev, "%s(): count=%d, size=%d\n", __func__,
                *count, *size);

        return 0;
}

/* Locking: caller holds fop_lock mutex */
static int sh_vou_buf_prepare(struct videobuf_queue *vq,
                              struct videobuf_buffer *vb,
                              enum v4l2_field field)
{
        struct video_device *vdev = vq->priv_data;
        struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
        struct v4l2_pix_format *pix = &vou_dev->pix;
        int bytes_per_line = vou_fmt[vou_dev->pix_idx].bpp * pix->width / 8;
        int ret;

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

        if (vb->width   != pix->width ||
            vb->height  != pix->height ||
            vb->field   != pix->field) {
                vb->width       = pix->width;
                vb->height      = pix->height;
                vb->field       = field;
                if (vb->state != VIDEOBUF_NEEDS_INIT)
                        free_buffer(vq, vb);
        }

        vb->size = vb->height * bytes_per_line;
        if (vb->baddr && vb->bsize < vb->size) {
                /* User buffer too small */
                dev_warn(vq->dev, "User buffer too small: [%zu] @ %lx\n",
                         vb->bsize, vb->baddr);
                return -EINVAL;
        }

        if (vb->state == VIDEOBUF_NEEDS_INIT) {
                ret = videobuf_iolock(vq, vb, NULL);
                if (ret < 0) {
                        dev_warn(vq->dev, "IOLOCK buf-type %d: %d\n",
                                 vb->memory, ret);
                        return ret;
                }
                vb->state = VIDEOBUF_PREPARED;
        }

        dev_dbg(vou_dev->v4l2_dev.dev,
                "%s(): fmt #%d, %u bytes per line, phys %pad, type %d, state %d\n",
                __func__, vou_dev->pix_idx, bytes_per_line,
                ({ dma_addr_t addr = videobuf_to_dma_contig(vb); &addr; }),
                vb->memory, vb->state);

        return 0;
}

/* Locking: caller holds fop_lock mutex and vq->irqlock spinlock */
static void sh_vou_buf_queue(struct videobuf_queue *vq,
                             struct videobuf_buffer *vb)
{
        struct video_device *vdev = vq->priv_data;
        struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

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

        vb->state = VIDEOBUF_QUEUED;
        list_add_tail(&vb->queue, &vou_dev->queue);

        if (vou_dev->status == SH_VOU_RUNNING) {
                return;
        } else if (!vou_dev->active) {
                vou_dev->active = vb;
                /* 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, vb);
                /* Only activate VOU after the second buffer */
        } else if (vou_dev->active->queue.next == &vb->queue) {
                /* Second buffer - initialise register side B */
                sh_vou_reg_a_write(vou_dev, VOURPR, 0);
                sh_vou_stream_start(vou_dev, vb);

                /* Register side switching with frame VSYNC */
                sh_vou_reg_a_write(vou_dev, VOURCR, 5);
                dev_dbg(vou_dev->v4l2_dev.dev, "%s: second buffer status 0x%x\n",
                        __func__, sh_vou_reg_a_read(vou_dev, VOUSTR));

                /* 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);
        }
}

static void sh_vou_buf_release(struct videobuf_queue *vq,
                               struct videobuf_buffer *vb)
{
        struct video_device *vdev = vq->priv_data;
        struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
        unsigned long flags;

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

        spin_lock_irqsave(&vou_dev->lock, flags);

        if (vou_dev->active == vb) {
                /* 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);
                vou_dev->active = NULL;
        }

        if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED)) {
                vb->state = VIDEOBUF_ERROR;
                list_del(&vb->queue);
        }

        spin_unlock_irqrestore(&vou_dev->lock, flags);

        free_buffer(vq, vb);
}

static struct videobuf_queue_ops sh_vou_video_qops = {
        .buf_setup      = sh_vou_buf_setup,
        .buf_prepare    = sh_vou_buf_prepare,
        .buf_queue      = sh_vou_buf_queue,
        .buf_release    = sh_vou_buf_release,
};

/* 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__);

        strlcpy(cap->card, "SuperH VOU", sizeof(cap->card));
        cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
        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->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        strlcpy(fmt->description, vou_fmt[fmt->index].desc,
                sizeof(fmt->description));
        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, "%s: scaling 0x%x\n", fmt->desc, 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, 0, VOU_MAX_IMAGE_WIDTH, 2,
                              &geo->in_height, 0, 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 = 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 = i;
                        best = found;
                }
                if (!err)
                        break;
        }

        geo->output.width = best;
        geo->scale_idx_h = idx;
        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], vou_scale_h_den[idx], 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 = i;
                        best = found;
                }
                if (!err)
                        break;
        }

        geo->output.height = best;
        geo->scale_idx_v = idx;
        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], vou_scale_v_den[idx], best);
}

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);
        struct v4l2_pix_format *pix = &fmt->fmt.pix;
        unsigned int img_height_max;
        int pix_idx;
        struct sh_vou_geometry geo;
        struct v4l2_mbus_framefmt mbfmt = {
                /* Revisit: is this the correct code? */
                .code = V4L2_MBUS_FMT_YUYV8_2X8,
                .field = V4L2_FIELD_INTERLACED,
                .colorspace = V4L2_COLORSPACE_SMPTE170M,
        };
        int ret;

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

        if (pix->field == V4L2_FIELD_ANY)
                pix->field = V4L2_FIELD_NONE;

        if (fmt->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
            pix->field != V4L2_FIELD_NONE)
                return -EINVAL;

        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;

        /* Image width must be a multiple of 4 */
        v4l_bound_align_image(&pix->width, 0, VOU_MAX_IMAGE_WIDTH, 2,
                              &pix->height, 0, img_height_max, 1, 0);

        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, video,
                                         s_mbus_fmt, &mbfmt);
        /* 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);

        /* Sanity checks */
        if ((unsigned)mbfmt.width > VOU_MAX_IMAGE_WIDTH ||
            (unsigned)mbfmt.height > img_height_max ||
            mbfmt.code != V4L2_MBUS_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_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;
        int i;

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

        fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        pix->field = V4L2_FIELD_NONE;

        v4l_bound_align_image(&pix->width, 0, VOU_MAX_IMAGE_WIDTH, 1,
                              &pix->height, 0, VOU_MAX_IMAGE_HEIGHT, 1, 0);

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

        pix->pixelformat = vou_fmt[0].pfmt;

        return 0;
}

static int sh_vou_reqbufs(struct file *file, void *priv,
                          struct v4l2_requestbuffers *req)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = priv;

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

        if (req->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
                return -EINVAL;

        return videobuf_reqbufs(&vou_file->vbq, req);
}

static int sh_vou_querybuf(struct file *file, void *priv,
                           struct v4l2_buffer *b)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = priv;

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

        return videobuf_querybuf(&vou_file->vbq, b);
}

static int sh_vou_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = priv;

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

        return videobuf_qbuf(&vou_file->vbq, b);
}

static int sh_vou_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = priv;

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

        return videobuf_dqbuf(&vou_file->vbq, b, file->f_flags & O_NONBLOCK);
}

static int sh_vou_streamon(struct file *file, void *priv,
                           enum v4l2_buf_type buftype)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = priv;
        int ret;

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

        ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0,
                                         video, s_stream, 1);
        if (ret < 0 && ret != -ENOIOCTLCMD)
                return ret;

        /* This calls our .buf_queue() (== sh_vou_buf_queue) */
        return videobuf_streamon(&vou_file->vbq);
}

static int sh_vou_streamoff(struct file *file, void *priv,
                            enum v4l2_buf_type buftype)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = priv;

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

        /*
         * This calls buf_release from host driver's videobuf_queue_ops for all
         * remaining buffers. When the last buffer is freed, stop streaming
         */
        videobuf_streamoff(&vou_file->vbq);
        v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video, s_stream, 0);

        return 0;
}

static u32 sh_vou_ntsc_mode(enum sh_vou_bus_fmt bus_fmt)
{
        switch (bus_fmt) {
        default:
                pr_warning("%s(): Invalid bus-format code %d, using default 8-bit\n",
                           __func__, bus_fmt);
        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->vdev->tvnorms)
                return -EINVAL;

        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;

        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);
        else
                sh_vou_reg_ab_set(vou_dev, VOUCR, 5 << 29, 7 << 29);

        vou_dev->std = std_id;

        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_g_crop(struct file *file, void *fh, struct v4l2_crop *a)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

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

        a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        a->c = vou_dev->rect;

        return 0;
}

/* Assume a dull encoder, do all the work ourselves. */
static int sh_vou_s_crop(struct file *file, void *fh, const struct v4l2_crop *a)
{
        struct v4l2_crop a_writable = *a;
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct v4l2_rect *rect = &a_writable.c;
        struct v4l2_crop sd_crop = {.type = V4L2_BUF_TYPE_VIDEO_OUTPUT};
        struct v4l2_pix_format *pix = &vou_dev->pix;
        struct sh_vou_geometry geo;
        struct v4l2_mbus_framefmt mbfmt = {
                /* Revisit: is this the correct code? */
                .code = V4L2_MBUS_FMT_YUYV8_2X8,
                .field = V4L2_FIELD_INTERLACED,
                .colorspace = V4L2_COLORSPACE_SMPTE170M,
        };
        unsigned int img_height_max;
        int ret;

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

        if (a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
                return -EINVAL;

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

        v4l_bound_align_image(&rect->width, 0, VOU_MAX_IMAGE_WIDTH, 1,
                              &rect->height, 0, 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_crop.c.width = geo.output.width;
        sd_crop.c.height = geo.output.height;
        /*
         * We first issue a S_CROP, so that the subsequent S_FMT delivers the
         * final encoder configuration.
         */
        v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
                                   s_crop, &sd_crop);
        mbfmt.width = geo.output.width;
        mbfmt.height = geo.output.height;
        ret = v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, video,
                                         s_mbus_fmt, &mbfmt);
        /* Must be implemented, so, don't check for -ENOIOCTLCMD */
        if (ret < 0)
                return ret;

        /* Sanity checks */
        if ((unsigned)mbfmt.width > VOU_MAX_IMAGE_WIDTH ||
            (unsigned)mbfmt.height > img_height_max ||
            mbfmt.code != V4L2_MBUS_FMT_YUYV8_2X8)
                return -EIO;

        geo.output.width = mbfmt.width;

        geo.output.height = mbfmt.height;

        /*
         * No down-scaling. According to the API, current call has precedence:
         * http://v4l2spec.bytesex.org/spec/x1904.htm#AEN1954 paragraph two.
         */
        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;
}

/*
 * Total field: NTSC 858 x 2 * 262/263, PAL 864 x 2 * 312/313, default rectangle
 * is the initial register values, height takes the interlaced format into
 * account. The actual image can only go up to 720 x 2 * 240, So, VOUVPR can
 * actually only meaningfully contain values <= 720 and <= 240 respectively, and
 * not <= 864 and <= 312.
 */
static int sh_vou_cropcap(struct file *file, void *priv,
                          struct v4l2_cropcap *a)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);

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

        a->type                         = V4L2_BUF_TYPE_VIDEO_OUTPUT;
        a->bounds.left                  = 0;
        a->bounds.top                   = 0;
        a->bounds.width                 = VOU_MAX_IMAGE_WIDTH;
        a->bounds.height                = VOU_MAX_IMAGE_HEIGHT;
        /* Default = max, set VOUDPR = 0, which is not hardware default */
        a->defrect.left                 = 0;
        a->defrect.top                  = 0;
        a->defrect.width                = VOU_MAX_IMAGE_WIDTH;
        a->defrect.height               = VOU_MAX_IMAGE_HEIGHT;
        a->pixelaspect.numerator        = 1;
        a->pixelaspect.denominator      = 1;

        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 videobuf_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->queue)) {
                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;
        list_del(&vb->queue);

        vb->state = VIDEOBUF_DONE;
        v4l2_get_timestamp(&vb->ts);
        vb->field_count++;
        wake_up(&vb->done);

        if (list_empty(&vou_dev->queue)) {
                /* Stop VOU */
                dev_dbg(vou_dev->v4l2_dev.dev, "%s: queue empty after %d\n",
                        __func__, cnt);
                sh_vou_reg_a_set(vou_dev, VOUER, 0, 1);
                vou_dev->active = NULL;
                vou_dev->status = SH_VOU_INITIALISING;
                /* Disable End-of-Frame (VSYNC) interrupts */
                sh_vou_reg_a_set(vou_dev, VOUIR, 0, 0x30000);
                spin_unlock(&vou_dev->lock);
                return IRQ_HANDLED;
        }

        vou_dev->active = list_entry(vou_dev->queue.next,
                                     struct videobuf_buffer, queue);

        if (vou_dev->active->queue.next != &vou_dev->queue) {
                struct videobuf_buffer *new = list_entry(vou_dev->active->queue.next,
                                                struct videobuf_buffer, queue);
                sh_vou_schedule_next(vou_dev, new);
        }

        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);

        return 0;
}

/* File operations */
static int sh_vou_open(struct file *file)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = kzalloc(sizeof(struct sh_vou_file),
                                               GFP_KERNEL);

        if (!vou_file)
                return -ENOMEM;

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

        file->private_data = vou_file;

        if (mutex_lock_interruptible(&vou_dev->fop_lock))
                return -ERESTARTSYS;
        if (atomic_inc_return(&vou_dev->use_count) == 1) {
                int ret;
                /* First open */
                vou_dev->status = SH_VOU_INITIALISING;
                pm_runtime_get_sync(vou_dev->v4l2_dev.dev);
                ret = sh_vou_hw_init(vou_dev);
                if (ret < 0) {
                        atomic_dec(&vou_dev->use_count);
                        pm_runtime_put(vou_dev->v4l2_dev.dev);
                        vou_dev->status = SH_VOU_IDLE;
                        mutex_unlock(&vou_dev->fop_lock);
                        return ret;
                }
        }

        videobuf_queue_dma_contig_init(&vou_file->vbq, &sh_vou_video_qops,
                                       vou_dev->v4l2_dev.dev, &vou_dev->lock,
                                       V4L2_BUF_TYPE_VIDEO_OUTPUT,
                                       V4L2_FIELD_NONE,
                                       sizeof(struct videobuf_buffer),
                                       vou_dev->vdev, &vou_dev->fop_lock);
        mutex_unlock(&vou_dev->fop_lock);

        return 0;
}

static int sh_vou_release(struct file *file)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = file->private_data;

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

        if (!atomic_dec_return(&vou_dev->use_count)) {
                mutex_lock(&vou_dev->fop_lock);
                /* Last close */
                vou_dev->status = SH_VOU_IDLE;
                sh_vou_reg_a_set(vou_dev, VOUER, 0, 0x101);
                pm_runtime_put(vou_dev->v4l2_dev.dev);
                mutex_unlock(&vou_dev->fop_lock);
        }

        file->private_data = NULL;
        kfree(vou_file);

        return 0;
}

static int sh_vou_mmap(struct file *file, struct vm_area_struct *vma)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = file->private_data;
        int ret;

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

        if (mutex_lock_interruptible(&vou_dev->fop_lock))
                return -ERESTARTSYS;
        ret = videobuf_mmap_mapper(&vou_file->vbq, vma);
        mutex_unlock(&vou_dev->fop_lock);
        return ret;
}

static unsigned int sh_vou_poll(struct file *file, poll_table *wait)
{
        struct sh_vou_device *vou_dev = video_drvdata(file);
        struct sh_vou_file *vou_file = file->private_data;
        unsigned int res;

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

        mutex_lock(&vou_dev->fop_lock);
        res = videobuf_poll_stream(file, &vou_file->vbq, wait);
        mutex_unlock(&vou_dev->fop_lock);
        return res;
}

/* 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                 = sh_vou_reqbufs,
        .vidioc_querybuf                = sh_vou_querybuf,
        .vidioc_qbuf                    = sh_vou_qbuf,
        .vidioc_dqbuf                   = sh_vou_dqbuf,
        .vidioc_streamon                = sh_vou_streamon,
        .vidioc_streamoff               = sh_vou_streamoff,
        .vidioc_s_std                   = sh_vou_s_std,
        .vidioc_g_std                   = sh_vou_g_std,
        .vidioc_cropcap                 = sh_vou_cropcap,
        .vidioc_g_crop                  = sh_vou_g_crop,
        .vidioc_s_crop                  = sh_vou_s_crop,
};

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           = sh_vou_mmap,
        .poll           = sh_vou_poll,
};

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,
};

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, *region;
        struct v4l2_subdev *subdev;
        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 = kzalloc(sizeof(*vou_dev), GFP_KERNEL);
        if (!vou_dev)
                return -ENOMEM;

        INIT_LIST_HEAD(&vou_dev->queue);
        spin_lock_init(&vou_dev->lock);
        mutex_init(&vou_dev->fop_lock);
        atomic_set(&vou_dev->use_count, 0);
        vou_dev->pdata = vou_pdata;
        vou_dev->status = SH_VOU_IDLE;

        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_YVYU;
        pix->field              = V4L2_FIELD_NONE;
        pix->bytesperline       = VOU_MAX_IMAGE_WIDTH * 2;
        pix->sizeimage          = VOU_MAX_IMAGE_WIDTH * 2 * 480;
        pix->colorspace         = V4L2_COLORSPACE_SMPTE170M;

        region = request_mem_region(reg_res->start, resource_size(reg_res),
                                    pdev->name);
        if (!region) {
                dev_err(&pdev->dev, "VOU region already claimed\n");
                ret = -EBUSY;
                goto ereqmemreg;
        }

        vou_dev->base = ioremap(reg_res->start, resource_size(reg_res));
        if (!vou_dev->base) {
                ret = -ENOMEM;
                goto emap;
        }

        ret = request_irq(irq, sh_vou_isr, 0, "vou", vou_dev);
        if (ret < 0)
                goto ereqirq;

        ret = v4l2_device_register(&pdev->dev, &vou_dev->v4l2_dev);
        if (ret < 0) {
                dev_err(&pdev->dev, "Error registering v4l2 device\n");
                goto ev4l2devreg;
        }

        /* Allocate memory for video device */
        vdev = video_device_alloc();
        if (vdev == NULL) {
                ret = -ENOMEM;
                goto evdevalloc;
        }

        *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;
        vdev->lock = &vou_dev->fop_lock;

        vou_dev->vdev = vdev;
        video_set_drvdata(vdev, vou_dev);

        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_GRABBER, -1);
        if (ret < 0)
                goto evregdev;

        return 0;

evregdev:
ei2cnd:
ereset:
        i2c_put_adapter(i2c_adap);
ei2cgadap:
        video_device_release(vdev);
        pm_runtime_disable(&pdev->dev);
evdevalloc:
        v4l2_device_unregister(&vou_dev->v4l2_dev);
ev4l2devreg:
        free_irq(irq, vou_dev);
ereqirq:
        iounmap(vou_dev->base);
emap:
        release_mem_region(reg_res->start, resource_size(reg_res));
ereqmemreg:
        kfree(vou_dev);
        return ret;
}

static int sh_vou_remove(struct platform_device *pdev)
{
        int irq = platform_get_irq(pdev, 0);
        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);
        struct resource *reg_res;

        if (irq > 0)
                free_irq(irq, vou_dev);
        pm_runtime_disable(&pdev->dev);
        video_unregister_device(vou_dev->vdev);
        i2c_put_adapter(client->adapter);
        v4l2_device_unregister(&vou_dev->v4l2_dev);
        iounmap(vou_dev->base);
        reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        if (reg_res)
                release_mem_region(reg_res->start, resource_size(reg_res));
        kfree(vou_dev);
        return 0;
}

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

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");