sh_vou.c

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

#include <linux/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) {
    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(vq->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(vq->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: [%u] @ %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(vq->dev,
        "%s(): fmt #%d, %u bytes per line, phys 0x%x, type %d, state %d\n",
        __func__, vou_dev->pix_idx, bytes_per_line,
        videobuf_to_dma_contig(vb), 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(vq->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(vq->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(vq->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(vq->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_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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_file *vou_file = priv;

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

    dev_dbg(vou_file->vbq.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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

    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, height_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, width_max, height_max,
        img_height_max;
    int i, idx;

    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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    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_file *vou_file = priv;
    struct v4l2_pix_format *pix = &fmt->fmt.pix;
    int i;

    dev_dbg(vou_file->vbq.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; 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_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    struct sh_vou_file *vou_file = priv;
    int ret;

    dev_dbg(vou_file->vbq.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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    struct sh_vou_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    int ret;

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

    if (*std_id & ~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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

    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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

    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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    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_file *vou_file = priv;

    dev_dbg(vou_file->vbq.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;
    static int side;
    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;
    do_gettimeofday(&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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    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(vdev->v4l2_dev->dev);
        ret = sh_vou_hw_init(vou_dev);
        if (ret < 0) {
            atomic_dec(&vou_dev->use_count);
            pm_runtime_put(vdev->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), vdev,
                       &vou_dev->fop_lock);
    mutex_unlock(&vou_dev->fop_lock);

    return 0;
}

static int sh_vou_release(struct file *file)
{
    struct video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    struct sh_vou_file *vou_file = file->private_data;

    dev_dbg(vou_file->vbq.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(vdev->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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    struct sh_vou_file *vou_file = file->private_data;
    int ret;

    dev_dbg(vou_file->vbq.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 video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);
    struct sh_vou_file *vou_file = file->private_data;
    unsigned int res;

    dev_dbg(vou_file->vbq.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;
}

static int sh_vou_g_chip_ident(struct file *file, void *fh,
                   struct v4l2_dbg_chip_ident *id)
{
    struct video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

    return v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, core, g_chip_ident, id);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int sh_vou_g_register(struct file *file, void *fh,
                 struct v4l2_dbg_register *reg)
{
    struct video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

    return v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, core, g_register, reg);
}

static int sh_vou_s_register(struct file *file, void *fh,
                 struct v4l2_dbg_register *reg)
{
    struct video_device *vdev = video_devdata(file);
    struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

    return v4l2_device_call_until_err(&vou_dev->v4l2_dev, 0, core, s_register, reg);
}
#endif

/* 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,
    .vidioc_g_chip_ident        = sh_vou_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
    .vidioc_g_register      = sh_vou_g_register,
    .vidioc_s_register      = sh_vou_s_register,
#endif
};

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 */
    .current_norm   = V4L2_STD_NTSC_M,
    .vfl_dir    = VFL_DIR_TX,
};

static int __devinit 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        = sh_vou_video_template.current_norm;
    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 __devexit 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  = __devexit_p(sh_vou_remove),
    .driver  = {
        .name   = "sh-vou",
        .owner  = THIS_MODULE,
    },
};

static int __init sh_vou_init(void)
{
    return platform_driver_probe(&sh_vou, sh_vou_probe);
}

static void __exit sh_vou_exit(void)
{
    platform_driver_unregister(&sh_vou);
}

module_init(sh_vou_init);
module_exit(sh_vou_exit);

MODULE_DESCRIPTION("SuperH VOU driver");
MODULE_AUTHOR("Guennadi Liakhovetski <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.1.0");
MODULE_ALIAS("platform:sh-vou");