omap_vout.c

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/*
 * omap_vout.c
 *
 * Copyright (C) 2005-2010 Texas Instruments.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 * Leveraged code from the OMAP2 camera driver
 * Video-for-Linux (Version 2) camera capture driver for
 * the OMAP24xx camera controller.
 *
 * Author: Andy Lowe ([email protected])
 *
 * Copyright (C) 2004 MontaVista Software, Inc.
 * Copyright (C) 2010 Texas Instruments.
 *
 * History:
 * 20-APR-2006 Khasim       Modified VRFB based Rotation,
 *              The image data is always read from 0 degree
 *              view and written
 *              to the virtual space of desired rotation angle
 * 4-DEC-2006  Jian     Changed to support better memory management
 *
 * 17-Nov-2008 Hardik       Changed driver to use video_ioctl2
 *
 * 23-Feb-2010 Vaibhav H    Modified to use new DSS2 interface
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/videodev2.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>

#include <media/videobuf-dma-contig.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>

#include <plat/cpu.h>
#include <plat/dma.h>
#include <plat/vrfb.h>
#include <video/omapdss.h>

#include "omap_voutlib.h"
#include "omap_voutdef.h"
#include "omap_vout_vrfb.h"

MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("OMAP Video for Linux Video out driver");
MODULE_LICENSE("GPL");

/* Driver Configuration macros */
#define VOUT_NAME       "omap_vout"

enum omap_vout_channels {
    OMAP_VIDEO1,
    OMAP_VIDEO2,
};

static struct videobuf_queue_ops video_vbq_ops;
/* Variables configurable through module params*/
static u32 video1_numbuffers = 3;
static u32 video2_numbuffers = 3;
static u32 video1_bufsize = OMAP_VOUT_MAX_BUF_SIZE;
static u32 video2_bufsize = OMAP_VOUT_MAX_BUF_SIZE;
static bool vid1_static_vrfb_alloc;
static bool vid2_static_vrfb_alloc;
static bool debug;

/* Module parameters */
module_param(video1_numbuffers, uint, S_IRUGO);
MODULE_PARM_DESC(video1_numbuffers,
    "Number of buffers to be allocated at init time for Video1 device.");

module_param(video2_numbuffers, uint, S_IRUGO);
MODULE_PARM_DESC(video2_numbuffers,
    "Number of buffers to be allocated at init time for Video2 device.");

module_param(video1_bufsize, uint, S_IRUGO);
MODULE_PARM_DESC(video1_bufsize,
    "Size of the buffer to be allocated for video1 device");

module_param(video2_bufsize, uint, S_IRUGO);
MODULE_PARM_DESC(video2_bufsize,
    "Size of the buffer to be allocated for video2 device");

module_param(vid1_static_vrfb_alloc, bool, S_IRUGO);
MODULE_PARM_DESC(vid1_static_vrfb_alloc,
    "Static allocation of the VRFB buffer for video1 device");

module_param(vid2_static_vrfb_alloc, bool, S_IRUGO);
MODULE_PARM_DESC(vid2_static_vrfb_alloc,
    "Static allocation of the VRFB buffer for video2 device");

module_param(debug, bool, S_IRUGO);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

/* list of image formats supported by OMAP2 video pipelines */
static const struct v4l2_fmtdesc omap_formats[] = {
    {
        /* Note:  V4L2 defines RGB565 as:
         *
         *      Byte 0                    Byte 1
         *      g2 g1 g0 r4 r3 r2 r1 r0   b4 b3 b2 b1 b0 g5 g4 g3
         *
         * We interpret RGB565 as:
         *
         *      Byte 0                    Byte 1
         *      g2 g1 g0 b4 b3 b2 b1 b0   r4 r3 r2 r1 r0 g5 g4 g3
         */
        .description = "RGB565, le",
        .pixelformat = V4L2_PIX_FMT_RGB565,
    },
    {
        /* Note:  V4L2 defines RGB32 as: RGB-8-8-8-8  we use
         *  this for RGB24 unpack mode, the last 8 bits are ignored
         * */
        .description = "RGB32, le",
        .pixelformat = V4L2_PIX_FMT_RGB32,
    },
    {
        /* Note:  V4L2 defines RGB24 as: RGB-8-8-8  we use
         *        this for RGB24 packed mode
         *
         */
        .description = "RGB24, le",
        .pixelformat = V4L2_PIX_FMT_RGB24,
    },
    {
        .description = "YUYV (YUV 4:2:2), packed",
        .pixelformat = V4L2_PIX_FMT_YUYV,
    },
    {
        .description = "UYVY, packed",
        .pixelformat = V4L2_PIX_FMT_UYVY,
    },
};

#define NUM_OUTPUT_FORMATS (ARRAY_SIZE(omap_formats))

/*
 * Try format
 */
static int omap_vout_try_format(struct v4l2_pix_format *pix)
{
    int ifmt, bpp = 0;

    pix->height = clamp(pix->height, (u32)VID_MIN_HEIGHT,
                        (u32)VID_MAX_HEIGHT);
    pix->width = clamp(pix->width, (u32)VID_MIN_WIDTH, (u32)VID_MAX_WIDTH);

    for (ifmt = 0; ifmt < NUM_OUTPUT_FORMATS; ifmt++) {
        if (pix->pixelformat == omap_formats[ifmt].pixelformat)
            break;
    }

    if (ifmt == NUM_OUTPUT_FORMATS)
        ifmt = 0;

    pix->pixelformat = omap_formats[ifmt].pixelformat;
    pix->field = V4L2_FIELD_ANY;
    pix->priv = 0;

    switch (pix->pixelformat) {
    case V4L2_PIX_FMT_YUYV:
    case V4L2_PIX_FMT_UYVY:
    default:
        pix->colorspace = V4L2_COLORSPACE_JPEG;
        bpp = YUYV_BPP;
        break;
    case V4L2_PIX_FMT_RGB565:
    case V4L2_PIX_FMT_RGB565X:
        pix->colorspace = V4L2_COLORSPACE_SRGB;
        bpp = RGB565_BPP;
        break;
    case V4L2_PIX_FMT_RGB24:
        pix->colorspace = V4L2_COLORSPACE_SRGB;
        bpp = RGB24_BPP;
        break;
    case V4L2_PIX_FMT_RGB32:
    case V4L2_PIX_FMT_BGR32:
        pix->colorspace = V4L2_COLORSPACE_SRGB;
        bpp = RGB32_BPP;
        break;
    }
    pix->bytesperline = pix->width * bpp;
    pix->sizeimage = pix->bytesperline * pix->height;

    return bpp;
}

/*
 * omap_vout_uservirt_to_phys: This inline function is used to convert user
 * space virtual address to physical address.
 */
static u32 omap_vout_uservirt_to_phys(u32 virtp)
{
    unsigned long physp = 0;
    struct vm_area_struct *vma;
    struct mm_struct *mm = current->mm;

    vma = find_vma(mm, virtp);
    /* For kernel direct-mapped memory, take the easy way */
    if (virtp >= PAGE_OFFSET) {
        physp = virt_to_phys((void *) virtp);
    } else if (vma && (vma->vm_flags & VM_IO) && vma->vm_pgoff) {
        /* this will catch, kernel-allocated, mmaped-to-usermode
           addresses */
        physp = (vma->vm_pgoff << PAGE_SHIFT) + (virtp - vma->vm_start);
    } else {
        /* otherwise, use get_user_pages() for general userland pages */
        int res, nr_pages = 1;
        struct page *pages;
        down_read(&current->mm->mmap_sem);

        res = get_user_pages(current, current->mm, virtp, nr_pages, 1,
                0, &pages, NULL);
        up_read(&current->mm->mmap_sem);

        if (res == nr_pages) {
            physp =  __pa(page_address(&pages[0]) +
                    (virtp & ~PAGE_MASK));
        } else {
            printk(KERN_WARNING VOUT_NAME
                    "get_user_pages failed\n");
            return 0;
        }
    }

    return physp;
}

/*
 * Free the V4L2 buffers
 */
void omap_vout_free_buffers(struct omap_vout_device *vout)
{
    int i, numbuffers;

    /* Allocate memory for the buffers */
    numbuffers = (vout->vid) ?  video2_numbuffers : video1_numbuffers;
    vout->buffer_size = (vout->vid) ? video2_bufsize : video1_bufsize;

    for (i = 0; i < numbuffers; i++) {
        omap_vout_free_buffer(vout->buf_virt_addr[i],
                vout->buffer_size);
        vout->buf_phy_addr[i] = 0;
        vout->buf_virt_addr[i] = 0;
    }
}

/*
 * Convert V4L2 rotation to DSS rotation
 *  V4L2 understand 0, 90, 180, 270.
 *  Convert to 0, 1, 2 and 3 respectively for DSS
 */
static int v4l2_rot_to_dss_rot(int v4l2_rotation,
            enum dss_rotation *rotation, bool mirror)
{
    int ret = 0;

    switch (v4l2_rotation) {
    case 90:
        *rotation = dss_rotation_90_degree;
        break;
    case 180:
        *rotation = dss_rotation_180_degree;
        break;
    case 270:
        *rotation = dss_rotation_270_degree;
        break;
    case 0:
        *rotation = dss_rotation_0_degree;
        break;
    default:
        ret = -EINVAL;
    }
    return ret;
}

static int omap_vout_calculate_offset(struct omap_vout_device *vout)
{
    struct omapvideo_info *ovid;
    struct v4l2_rect *crop = &vout->crop;
    struct v4l2_pix_format *pix = &vout->pix;
    int *cropped_offset = &vout->cropped_offset;
    int ps = 2, line_length = 0;

    ovid = &vout->vid_info;

    if (ovid->rotation_type == VOUT_ROT_VRFB) {
        omap_vout_calculate_vrfb_offset(vout);
    } else {
        vout->line_length = line_length = pix->width;

        if (V4L2_PIX_FMT_YUYV == pix->pixelformat ||
            V4L2_PIX_FMT_UYVY == pix->pixelformat)
            ps = 2;
        else if (V4L2_PIX_FMT_RGB32 == pix->pixelformat)
            ps = 4;
        else if (V4L2_PIX_FMT_RGB24 == pix->pixelformat)
            ps = 3;

        vout->ps = ps;

        *cropped_offset = (line_length * ps) *
            crop->top + crop->left * ps;
    }

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "%s Offset:%x\n",
            __func__, vout->cropped_offset);

    return 0;
}

/*
 * Convert V4L2 pixel format to DSS pixel format
 */
static int video_mode_to_dss_mode(struct omap_vout_device *vout)
{
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct v4l2_pix_format *pix = &vout->pix;
    enum omap_color_mode mode;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    switch (pix->pixelformat) {
    case 0:
        break;
    case V4L2_PIX_FMT_YUYV:
        mode = OMAP_DSS_COLOR_YUV2;
        break;
    case V4L2_PIX_FMT_UYVY:
        mode = OMAP_DSS_COLOR_UYVY;
        break;
    case V4L2_PIX_FMT_RGB565:
        mode = OMAP_DSS_COLOR_RGB16;
        break;
    case V4L2_PIX_FMT_RGB24:
        mode = OMAP_DSS_COLOR_RGB24P;
        break;
    case V4L2_PIX_FMT_RGB32:
        mode = (ovl->id == OMAP_DSS_VIDEO1) ?
            OMAP_DSS_COLOR_RGB24U : OMAP_DSS_COLOR_ARGB32;
        break;
    case V4L2_PIX_FMT_BGR32:
        mode = OMAP_DSS_COLOR_RGBX32;
        break;
    default:
        mode = -EINVAL;
    }
    return mode;
}

/*
 * Setup the overlay
 */
static int omapvid_setup_overlay(struct omap_vout_device *vout,
        struct omap_overlay *ovl, int posx, int posy, int outw,
        int outh, u32 addr)
{
    int ret = 0;
    struct omap_overlay_info info;
    int cropheight, cropwidth, pixheight, pixwidth;

    if ((ovl->caps & OMAP_DSS_OVL_CAP_SCALE) == 0 &&
            (outw != vout->pix.width || outh != vout->pix.height)) {
        ret = -EINVAL;
        goto setup_ovl_err;
    }

    vout->dss_mode = video_mode_to_dss_mode(vout);
    if (vout->dss_mode == -EINVAL) {
        ret = -EINVAL;
        goto setup_ovl_err;
    }

    /* Setup the input plane parameters according to
     * rotation value selected.
     */
    if (is_rotation_90_or_270(vout)) {
        cropheight = vout->crop.width;
        cropwidth = vout->crop.height;
        pixheight = vout->pix.width;
        pixwidth = vout->pix.height;
    } else {
        cropheight = vout->crop.height;
        cropwidth = vout->crop.width;
        pixheight = vout->pix.height;
        pixwidth = vout->pix.width;
    }

    ovl->get_overlay_info(ovl, &info);
    info.paddr = addr;
    info.width = cropwidth;
    info.height = cropheight;
    info.color_mode = vout->dss_mode;
    info.mirror = vout->mirror;
    info.pos_x = posx;
    info.pos_y = posy;
    info.out_width = outw;
    info.out_height = outh;
    info.global_alpha = vout->win.global_alpha;
    if (!is_rotation_enabled(vout)) {
        info.rotation = 0;
        info.rotation_type = OMAP_DSS_ROT_DMA;
        info.screen_width = pixwidth;
    } else {
        info.rotation = vout->rotation;
        info.rotation_type = OMAP_DSS_ROT_VRFB;
        info.screen_width = 2048;
    }

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev,
        "%s enable=%d addr=%x width=%d\n height=%d color_mode=%d\n"
        "rotation=%d mirror=%d posx=%d posy=%d out_width = %d \n"
        "out_height=%d rotation_type=%d screen_width=%d\n",
        __func__, ovl->is_enabled(ovl), info.paddr, info.width, info.height,
        info.color_mode, info.rotation, info.mirror, info.pos_x,
        info.pos_y, info.out_width, info.out_height, info.rotation_type,
        info.screen_width);

    ret = ovl->set_overlay_info(ovl, &info);
    if (ret)
        goto setup_ovl_err;

    return 0;

setup_ovl_err:
    v4l2_warn(&vout->vid_dev->v4l2_dev, "setup_overlay failed\n");
    return ret;
}

/*
 * Initialize the overlay structure
 */
static int omapvid_init(struct omap_vout_device *vout, u32 addr)
{
    int ret = 0, i;
    struct v4l2_window *win;
    struct omap_overlay *ovl;
    int posx, posy, outw, outh, temp;
    struct omap_video_timings *timing;
    struct omapvideo_info *ovid = &vout->vid_info;

    win = &vout->win;
    for (i = 0; i < ovid->num_overlays; i++) {
        struct omap_dss_device *dssdev;

        ovl = ovid->overlays[i];
        dssdev = ovl->get_device(ovl);

        if (!dssdev)
            return -EINVAL;

        timing = &dssdev->panel.timings;

        outw = win->w.width;
        outh = win->w.height;
        switch (vout->rotation) {
        case dss_rotation_90_degree:
            /* Invert the height and width for 90
             * and 270 degree rotation
             */
            temp = outw;
            outw = outh;
            outh = temp;
            posy = (timing->y_res - win->w.width) - win->w.left;
            posx = win->w.top;
            break;

        case dss_rotation_180_degree:
            posx = (timing->x_res - win->w.width) - win->w.left;
            posy = (timing->y_res - win->w.height) - win->w.top;
            break;

        case dss_rotation_270_degree:
            temp = outw;
            outw = outh;
            outh = temp;
            posy = win->w.left;
            posx = (timing->x_res - win->w.height) - win->w.top;
            break;

        default:
            posx = win->w.left;
            posy = win->w.top;
            break;
        }

        ret = omapvid_setup_overlay(vout, ovl, posx, posy,
                outw, outh, addr);
        if (ret)
            goto omapvid_init_err;
    }
    return 0;

omapvid_init_err:
    v4l2_warn(&vout->vid_dev->v4l2_dev, "apply_changes failed\n");
    return ret;
}

/*
 * Apply the changes set the go bit of DSS
 */
static int omapvid_apply_changes(struct omap_vout_device *vout)
{
    int i;
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid = &vout->vid_info;

    for (i = 0; i < ovid->num_overlays; i++) {
        struct omap_dss_device *dssdev;

        ovl = ovid->overlays[i];
        dssdev = ovl->get_device(ovl);
        if (!dssdev)
            return -EINVAL;
        ovl->manager->apply(ovl->manager);
    }

    return 0;
}

static int omapvid_handle_interlace_display(struct omap_vout_device *vout,
        unsigned int irqstatus, struct timeval timevalue)
{
    u32 fid;

    if (vout->first_int) {
        vout->first_int = 0;
        goto err;
    }

    if (irqstatus & DISPC_IRQ_EVSYNC_ODD)
        fid = 1;
    else if (irqstatus & DISPC_IRQ_EVSYNC_EVEN)
        fid = 0;
    else
        goto err;

    vout->field_id ^= 1;
    if (fid != vout->field_id) {
        if (fid == 0)
            vout->field_id = fid;
    } else if (0 == fid) {
        if (vout->cur_frm == vout->next_frm)
            goto err;

        vout->cur_frm->ts = timevalue;
        vout->cur_frm->state = VIDEOBUF_DONE;
        wake_up_interruptible(&vout->cur_frm->done);
        vout->cur_frm = vout->next_frm;
    } else {
        if (list_empty(&vout->dma_queue) ||
                (vout->cur_frm != vout->next_frm))
            goto err;
    }

    return vout->field_id;
err:
    return 0;
}

static void omap_vout_isr(void *arg, unsigned int irqstatus)
{
    int ret, fid, mgr_id;
    u32 addr, irq;
    struct omap_overlay *ovl;
    struct timeval timevalue;
    struct omapvideo_info *ovid;
    struct omap_dss_device *cur_display;
    struct omap_vout_device *vout = (struct omap_vout_device *)arg;

    if (!vout->streaming)
        return;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    mgr_id = ovl->manager->id;

    /* get the display device attached to the overlay */
    cur_display = ovl->get_device(ovl);

    if (!cur_display)
        return;

    spin_lock(&vout->vbq_lock);
    do_gettimeofday(&timevalue);

    switch (cur_display->type) {
    case OMAP_DISPLAY_TYPE_DSI:
    case OMAP_DISPLAY_TYPE_DPI:
        if (mgr_id == OMAP_DSS_CHANNEL_LCD)
            irq = DISPC_IRQ_VSYNC;
        else if (mgr_id == OMAP_DSS_CHANNEL_LCD2)
            irq = DISPC_IRQ_VSYNC2;
        else
            goto vout_isr_err;

        if (!(irqstatus & irq))
            goto vout_isr_err;
        break;
    case OMAP_DISPLAY_TYPE_VENC:
        fid = omapvid_handle_interlace_display(vout, irqstatus,
                timevalue);
        if (!fid)
            goto vout_isr_err;
        break;
    case OMAP_DISPLAY_TYPE_HDMI:
        if (!(irqstatus & DISPC_IRQ_EVSYNC_EVEN))
            goto vout_isr_err;
        break;
    default:
        goto vout_isr_err;
    }

    if (!vout->first_int && (vout->cur_frm != vout->next_frm)) {
        vout->cur_frm->ts = timevalue;
        vout->cur_frm->state = VIDEOBUF_DONE;
        wake_up_interruptible(&vout->cur_frm->done);
        vout->cur_frm = vout->next_frm;
    }

    vout->first_int = 0;
    if (list_empty(&vout->dma_queue))
        goto vout_isr_err;

    vout->next_frm = list_entry(vout->dma_queue.next,
            struct videobuf_buffer, queue);
    list_del(&vout->next_frm->queue);

    vout->next_frm->state = VIDEOBUF_ACTIVE;

    addr = (unsigned long) vout->queued_buf_addr[vout->next_frm->i]
        + vout->cropped_offset;

    /* First save the configuration in ovelray structure */
    ret = omapvid_init(vout, addr);
    if (ret)
        printk(KERN_ERR VOUT_NAME
            "failed to set overlay info\n");
    /* Enable the pipeline and set the Go bit */
    ret = omapvid_apply_changes(vout);
    if (ret)
        printk(KERN_ERR VOUT_NAME "failed to change mode\n");

vout_isr_err:
    spin_unlock(&vout->vbq_lock);
}

/* Video buffer call backs */

/*
 * Buffer setup function is called by videobuf layer when REQBUF ioctl is
 * called. This is used to setup buffers and return size and count of
 * buffers allocated. After the call to this buffer, videobuf layer will
 * setup buffer queue depending on the size and count of buffers
 */
static int omap_vout_buffer_setup(struct videobuf_queue *q, unsigned int *count,
              unsigned int *size)
{
    int startindex = 0, i, j;
    u32 phy_addr = 0, virt_addr = 0;
    struct omap_vout_device *vout = q->priv_data;
    struct omapvideo_info *ovid = &vout->vid_info;
    int vid_max_buf_size;

    if (!vout)
        return -EINVAL;

    vid_max_buf_size = vout->vid == OMAP_VIDEO1 ? video1_bufsize :
        video2_bufsize;

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

    startindex = (vout->vid == OMAP_VIDEO1) ?
        video1_numbuffers : video2_numbuffers;
    if (V4L2_MEMORY_MMAP == vout->memory && *count < startindex)
        *count = startindex;

    if (ovid->rotation_type == VOUT_ROT_VRFB) {
        if (omap_vout_vrfb_buffer_setup(vout, count, startindex))
            return -ENOMEM;
    }

    if (V4L2_MEMORY_MMAP != vout->memory)
        return 0;

    /* Now allocated the V4L2 buffers */
    *size = PAGE_ALIGN(vout->pix.width * vout->pix.height * vout->bpp);
    startindex = (vout->vid == OMAP_VIDEO1) ?
        video1_numbuffers : video2_numbuffers;

    /* Check the size of the buffer */
    if (*size > vid_max_buf_size) {
        v4l2_err(&vout->vid_dev->v4l2_dev,
                "buffer allocation mismatch [%u] [%u]\n",
                *size, vout->buffer_size);
        return -ENOMEM;
    }

    for (i = startindex; i < *count; i++) {
        vout->buffer_size = *size;

        virt_addr = omap_vout_alloc_buffer(vout->buffer_size,
                &phy_addr);
        if (!virt_addr) {
            if (ovid->rotation_type == VOUT_ROT_NONE) {
                break;
            } else {
                if (!is_rotation_enabled(vout))
                    break;
            /* Free the VRFB buffers if no space for V4L2 buffers */
            for (j = i; j < *count; j++) {
                omap_vout_free_buffer(
                        vout->smsshado_virt_addr[j],
                        vout->smsshado_size);
                vout->smsshado_virt_addr[j] = 0;
                vout->smsshado_phy_addr[j] = 0;
                }
            }
        }
        vout->buf_virt_addr[i] = virt_addr;
        vout->buf_phy_addr[i] = phy_addr;
    }
    *count = vout->buffer_allocated = i;

    return 0;
}

/*
 * Free the V4L2 buffers additionally allocated than default
 * number of buffers
 */
static void omap_vout_free_extra_buffers(struct omap_vout_device *vout)
{
    int num_buffers = 0, i;

    num_buffers = (vout->vid == OMAP_VIDEO1) ?
        video1_numbuffers : video2_numbuffers;

    for (i = num_buffers; i < vout->buffer_allocated; i++) {
        if (vout->buf_virt_addr[i])
            omap_vout_free_buffer(vout->buf_virt_addr[i],
                    vout->buffer_size);

        vout->buf_virt_addr[i] = 0;
        vout->buf_phy_addr[i] = 0;
    }
    vout->buffer_allocated = num_buffers;
}

/*
 * This function will be called when VIDIOC_QBUF ioctl is called.
 * It prepare buffers before give out for the display. This function
 * converts user space virtual address into physical address if userptr memory
 * exchange mechanism is used. If rotation is enabled, it copies entire
 * buffer into VRFB memory space before giving it to the DSS.
 */
static int omap_vout_buffer_prepare(struct videobuf_queue *q,
            struct videobuf_buffer *vb,
            enum v4l2_field field)
{
    struct omap_vout_device *vout = q->priv_data;
    struct omapvideo_info *ovid = &vout->vid_info;

    if (VIDEOBUF_NEEDS_INIT == vb->state) {
        vb->width = vout->pix.width;
        vb->height = vout->pix.height;
        vb->size = vb->width * vb->height * vout->bpp;
        vb->field = field;
    }
    vb->state = VIDEOBUF_PREPARED;
    /* if user pointer memory mechanism is used, get the physical
     * address of the buffer
     */
    if (V4L2_MEMORY_USERPTR == vb->memory) {
        if (0 == vb->baddr)
            return -EINVAL;
        /* Physical address */
        vout->queued_buf_addr[vb->i] = (u8 *)
            omap_vout_uservirt_to_phys(vb->baddr);
    } else {
        u32 addr, dma_addr;
        unsigned long size;

        addr = (unsigned long) vout->buf_virt_addr[vb->i];
        size = (unsigned long) vb->size;

        dma_addr = dma_map_single(vout->vid_dev->v4l2_dev.dev, (void *) addr,
                size, DMA_TO_DEVICE);
        if (dma_mapping_error(vout->vid_dev->v4l2_dev.dev, dma_addr))
            v4l2_err(&vout->vid_dev->v4l2_dev, "dma_map_single failed\n");

        vout->queued_buf_addr[vb->i] = (u8 *)vout->buf_phy_addr[vb->i];
    }

    if (ovid->rotation_type == VOUT_ROT_VRFB)
        return omap_vout_prepare_vrfb(vout, vb);
    else
        return 0;
}

/*
 * Buffer queue function will be called from the videobuf layer when _QBUF
 * ioctl is called. It is used to enqueue buffer, which is ready to be
 * displayed.
 */
static void omap_vout_buffer_queue(struct videobuf_queue *q,
              struct videobuf_buffer *vb)
{
    struct omap_vout_device *vout = q->priv_data;

    /* Driver is also maintainig a queue. So enqueue buffer in the driver
     * queue */
    list_add_tail(&vb->queue, &vout->dma_queue);

    vb->state = VIDEOBUF_QUEUED;
}

/*
 * Buffer release function is called from videobuf layer to release buffer
 * which are already allocated
 */
static void omap_vout_buffer_release(struct videobuf_queue *q,
                struct videobuf_buffer *vb)
{
    struct omap_vout_device *vout = q->priv_data;

    vb->state = VIDEOBUF_NEEDS_INIT;

    if (V4L2_MEMORY_MMAP != vout->memory)
        return;
}

/*
 *  File operations
 */
static unsigned int omap_vout_poll(struct file *file,
                   struct poll_table_struct *wait)
{
    struct omap_vout_device *vout = file->private_data;
    struct videobuf_queue *q = &vout->vbq;

    return videobuf_poll_stream(file, q, wait);
}

static void omap_vout_vm_open(struct vm_area_struct *vma)
{
    struct omap_vout_device *vout = vma->vm_private_data;

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev,
        "vm_open [vma=%08lx-%08lx]\n", vma->vm_start, vma->vm_end);
    vout->mmap_count++;
}

static void omap_vout_vm_close(struct vm_area_struct *vma)
{
    struct omap_vout_device *vout = vma->vm_private_data;

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev,
        "vm_close [vma=%08lx-%08lx]\n", vma->vm_start, vma->vm_end);
    vout->mmap_count--;
}

static struct vm_operations_struct omap_vout_vm_ops = {
    .open   = omap_vout_vm_open,
    .close  = omap_vout_vm_close,
};

static int omap_vout_mmap(struct file *file, struct vm_area_struct *vma)
{
    int i;
    void *pos;
    unsigned long start = vma->vm_start;
    unsigned long size = (vma->vm_end - vma->vm_start);
    struct omap_vout_device *vout = file->private_data;
    struct videobuf_queue *q = &vout->vbq;

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev,
            " %s pgoff=0x%lx, start=0x%lx, end=0x%lx\n", __func__,
            vma->vm_pgoff, vma->vm_start, vma->vm_end);

    /* look for the buffer to map */
    for (i = 0; i < VIDEO_MAX_FRAME; i++) {
        if (NULL == q->bufs[i])
            continue;
        if (V4L2_MEMORY_MMAP != q->bufs[i]->memory)
            continue;
        if (q->bufs[i]->boff == (vma->vm_pgoff << PAGE_SHIFT))
            break;
    }

    if (VIDEO_MAX_FRAME == i) {
        v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev,
                "offset invalid [offset=0x%lx]\n",
                (vma->vm_pgoff << PAGE_SHIFT));
        return -EINVAL;
    }
    /* Check the size of the buffer */
    if (size > vout->buffer_size) {
        v4l2_err(&vout->vid_dev->v4l2_dev,
                "insufficient memory [%lu] [%u]\n",
                size, vout->buffer_size);
        return -ENOMEM;
    }

    q->bufs[i]->baddr = vma->vm_start;

    vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
    vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
    vma->vm_ops = &omap_vout_vm_ops;
    vma->vm_private_data = (void *) vout;
    pos = (void *)vout->buf_virt_addr[i];
    vma->vm_pgoff = virt_to_phys((void *)pos) >> PAGE_SHIFT;
    while (size > 0) {
        unsigned long pfn;
        pfn = virt_to_phys((void *) pos) >> PAGE_SHIFT;
        if (remap_pfn_range(vma, start, pfn, PAGE_SIZE, PAGE_SHARED))
            return -EAGAIN;
        start += PAGE_SIZE;
        pos += PAGE_SIZE;
        size -= PAGE_SIZE;
    }
    vout->mmap_count++;
    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Exiting %s\n", __func__);

    return 0;
}

static int omap_vout_release(struct file *file)
{
    unsigned int ret, i;
    struct videobuf_queue *q;
    struct omapvideo_info *ovid;
    struct omap_vout_device *vout = file->private_data;

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Entering %s\n", __func__);
    ovid = &vout->vid_info;

    if (!vout)
        return 0;

    q = &vout->vbq;
    /* Disable all the overlay managers connected with this interface */
    for (i = 0; i < ovid->num_overlays; i++) {
        struct omap_overlay *ovl = ovid->overlays[i];
        struct omap_dss_device *dssdev = ovl->get_device(ovl);

        if (dssdev)
            ovl->disable(ovl);
    }
    /* Turn off the pipeline */
    ret = omapvid_apply_changes(vout);
    if (ret)
        v4l2_warn(&vout->vid_dev->v4l2_dev,
                "Unable to apply changes\n");

    /* Free all buffers */
    omap_vout_free_extra_buffers(vout);

    /* Free the VRFB buffers only if they are allocated
     * during reqbufs.  Don't free if init time allocated
     */
    if (ovid->rotation_type == VOUT_ROT_VRFB) {
        if (!vout->vrfb_static_allocation)
            omap_vout_free_vrfb_buffers(vout);
    }
    videobuf_mmap_free(q);

    /* Even if apply changes fails we should continue
       freeing allocated memory */
    if (vout->streaming) {
        u32 mask = 0;

        mask = DISPC_IRQ_VSYNC | DISPC_IRQ_EVSYNC_EVEN |
            DISPC_IRQ_EVSYNC_ODD | DISPC_IRQ_VSYNC2;
        omap_dispc_unregister_isr(omap_vout_isr, vout, mask);
        vout->streaming = 0;

        videobuf_streamoff(q);
        videobuf_queue_cancel(q);
    }

    if (vout->mmap_count != 0)
        vout->mmap_count = 0;

    vout->opened -= 1;
    file->private_data = NULL;

    if (vout->buffer_allocated)
        videobuf_mmap_free(q);

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Exiting %s\n", __func__);
    return ret;
}

static int omap_vout_open(struct file *file)
{
    struct videobuf_queue *q;
    struct omap_vout_device *vout = NULL;

    vout = video_drvdata(file);
    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Entering %s\n", __func__);

    if (vout == NULL)
        return -ENODEV;

    /* for now, we only support single open */
    if (vout->opened)
        return -EBUSY;

    vout->opened += 1;

    file->private_data = vout;
    vout->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;

    q = &vout->vbq;
    video_vbq_ops.buf_setup = omap_vout_buffer_setup;
    video_vbq_ops.buf_prepare = omap_vout_buffer_prepare;
    video_vbq_ops.buf_release = omap_vout_buffer_release;
    video_vbq_ops.buf_queue = omap_vout_buffer_queue;
    spin_lock_init(&vout->vbq_lock);

    videobuf_queue_dma_contig_init(q, &video_vbq_ops, q->dev,
            &vout->vbq_lock, vout->type, V4L2_FIELD_NONE,
            sizeof(struct videobuf_buffer), vout, NULL);

    v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Exiting %s\n", __func__);
    return 0;
}

/*
 * V4L2 ioctls
 */
static int vidioc_querycap(struct file *file, void *fh,
        struct v4l2_capability *cap)
{
    struct omap_vout_device *vout = fh;

    strlcpy(cap->driver, VOUT_NAME, sizeof(cap->driver));
    strlcpy(cap->card, vout->vfd->name, sizeof(cap->card));
    cap->bus_info[0] = '\0';
    cap->capabilities = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_OUTPUT |
        V4L2_CAP_VIDEO_OUTPUT_OVERLAY;

    return 0;
}

static int vidioc_enum_fmt_vid_out(struct file *file, void *fh,
            struct v4l2_fmtdesc *fmt)
{
    int index = fmt->index;

    if (index >= NUM_OUTPUT_FORMATS)
        return -EINVAL;

    fmt->flags = omap_formats[index].flags;
    strlcpy(fmt->description, omap_formats[index].description,
            sizeof(fmt->description));
    fmt->pixelformat = omap_formats[index].pixelformat;

    return 0;
}

static int vidioc_g_fmt_vid_out(struct file *file, void *fh,
            struct v4l2_format *f)
{
    struct omap_vout_device *vout = fh;

    f->fmt.pix = vout->pix;
    return 0;

}

static int vidioc_try_fmt_vid_out(struct file *file, void *fh,
            struct v4l2_format *f)
{
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct omap_video_timings *timing;
    struct omap_vout_device *vout = fh;
    struct omap_dss_device *dssdev;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];
    /* get the display device attached to the overlay */
    dssdev = ovl->get_device(ovl);

    if (!dssdev)
        return -EINVAL;

    timing = &dssdev->panel.timings;

    vout->fbuf.fmt.height = timing->y_res;
    vout->fbuf.fmt.width = timing->x_res;

    omap_vout_try_format(&f->fmt.pix);
    return 0;
}

static int vidioc_s_fmt_vid_out(struct file *file, void *fh,
            struct v4l2_format *f)
{
    int ret, bpp;
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct omap_video_timings *timing;
    struct omap_vout_device *vout = fh;
    struct omap_dss_device *dssdev;

    if (vout->streaming)
        return -EBUSY;

    mutex_lock(&vout->lock);

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];
    dssdev = ovl->get_device(ovl);

    /* get the display device attached to the overlay */
    if (!dssdev) {
        ret = -EINVAL;
        goto s_fmt_vid_out_exit;
    }
    timing = &dssdev->panel.timings;

    /* We dont support RGB24-packed mode if vrfb rotation
     * is enabled*/
    if ((is_rotation_enabled(vout)) &&
            f->fmt.pix.pixelformat == V4L2_PIX_FMT_RGB24) {
        ret = -EINVAL;
        goto s_fmt_vid_out_exit;
    }

    /* get the framebuffer parameters */

    if (is_rotation_90_or_270(vout)) {
        vout->fbuf.fmt.height = timing->x_res;
        vout->fbuf.fmt.width = timing->y_res;
    } else {
        vout->fbuf.fmt.height = timing->y_res;
        vout->fbuf.fmt.width = timing->x_res;
    }

    /* change to samller size is OK */

    bpp = omap_vout_try_format(&f->fmt.pix);
    f->fmt.pix.sizeimage = f->fmt.pix.width * f->fmt.pix.height * bpp;

    /* try & set the new output format */
    vout->bpp = bpp;
    vout->pix = f->fmt.pix;
    vout->vrfb_bpp = 1;

    /* If YUYV then vrfb bpp is 2, for  others its 1 */
    if (V4L2_PIX_FMT_YUYV == vout->pix.pixelformat ||
            V4L2_PIX_FMT_UYVY == vout->pix.pixelformat)
        vout->vrfb_bpp = 2;

    /* set default crop and win */
    omap_vout_new_format(&vout->pix, &vout->fbuf, &vout->crop, &vout->win);

    /* Save the changes in the overlay strcuture */
    ret = omapvid_init(vout, 0);
    if (ret) {
        v4l2_err(&vout->vid_dev->v4l2_dev, "failed to change mode\n");
        goto s_fmt_vid_out_exit;
    }

    ret = 0;

s_fmt_vid_out_exit:
    mutex_unlock(&vout->lock);
    return ret;
}

static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh,
            struct v4l2_format *f)
{
    int ret = 0;
    struct omap_vout_device *vout = fh;
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct v4l2_window *win = &f->fmt.win;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    ret = omap_vout_try_window(&vout->fbuf, win);

    if (!ret) {
        if ((ovl->caps & OMAP_DSS_OVL_CAP_GLOBAL_ALPHA) == 0)
            win->global_alpha = 255;
        else
            win->global_alpha = f->fmt.win.global_alpha;
    }

    return ret;
}

static int vidioc_s_fmt_vid_overlay(struct file *file, void *fh,
            struct v4l2_format *f)
{
    int ret = 0;
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct omap_vout_device *vout = fh;
    struct v4l2_window *win = &f->fmt.win;

    mutex_lock(&vout->lock);
    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    ret = omap_vout_new_window(&vout->crop, &vout->win, &vout->fbuf, win);
    if (!ret) {
        /* Video1 plane does not support global alpha on OMAP3 */
        if ((ovl->caps & OMAP_DSS_OVL_CAP_GLOBAL_ALPHA) == 0)
            vout->win.global_alpha = 255;
        else
            vout->win.global_alpha = f->fmt.win.global_alpha;

        vout->win.chromakey = f->fmt.win.chromakey;
    }
    mutex_unlock(&vout->lock);
    return ret;
}

static int vidioc_enum_fmt_vid_overlay(struct file *file, void *fh,
            struct v4l2_fmtdesc *fmt)
{
    int index = fmt->index;

    if (index >= NUM_OUTPUT_FORMATS)
        return -EINVAL;

    fmt->flags = omap_formats[index].flags;
    strlcpy(fmt->description, omap_formats[index].description,
            sizeof(fmt->description));
    fmt->pixelformat = omap_formats[index].pixelformat;
    return 0;
}

static int vidioc_g_fmt_vid_overlay(struct file *file, void *fh,
            struct v4l2_format *f)
{
    u32 key_value =  0;
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct omap_vout_device *vout = fh;
    struct omap_overlay_manager_info info;
    struct v4l2_window *win = &f->fmt.win;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    win->w = vout->win.w;
    win->field = vout->win.field;
    win->global_alpha = vout->win.global_alpha;

    if (ovl->manager && ovl->manager->get_manager_info) {
        ovl->manager->get_manager_info(ovl->manager, &info);
        key_value = info.trans_key;
    }
    win->chromakey = key_value;
    return 0;
}

static int vidioc_cropcap(struct file *file, void *fh,
        struct v4l2_cropcap *cropcap)
{
    struct omap_vout_device *vout = fh;
    struct v4l2_pix_format *pix = &vout->pix;

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

    /* Width and height are always even */
    cropcap->bounds.width = pix->width & ~1;
    cropcap->bounds.height = pix->height & ~1;

    omap_vout_default_crop(&vout->pix, &vout->fbuf, &cropcap->defrect);
    cropcap->pixelaspect.numerator = 1;
    cropcap->pixelaspect.denominator = 1;
    return 0;
}

static int vidioc_g_crop(struct file *file, void *fh, struct v4l2_crop *crop)
{
    struct omap_vout_device *vout = fh;

    if (crop->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
        return -EINVAL;
    crop->c = vout->crop;
    return 0;
}

static int vidioc_s_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
{
    int ret = -EINVAL;
    struct omap_vout_device *vout = fh;
    struct omapvideo_info *ovid;
    struct omap_overlay *ovl;
    struct omap_video_timings *timing;
    struct omap_dss_device *dssdev;

    if (vout->streaming)
        return -EBUSY;

    mutex_lock(&vout->lock);
    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];
    /* get the display device attached to the overlay */
    dssdev = ovl->get_device(ovl);

    if (!dssdev) {
        ret = -EINVAL;
        goto s_crop_err;
    }

    timing = &dssdev->panel.timings;

    if (is_rotation_90_or_270(vout)) {
        vout->fbuf.fmt.height = timing->x_res;
        vout->fbuf.fmt.width = timing->y_res;
    } else {
        vout->fbuf.fmt.height = timing->y_res;
        vout->fbuf.fmt.width = timing->x_res;
    }

    if (crop->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
        ret = omap_vout_new_crop(&vout->pix, &vout->crop, &vout->win,
                &vout->fbuf, &crop->c);

s_crop_err:
    mutex_unlock(&vout->lock);
    return ret;
}

static int vidioc_queryctrl(struct file *file, void *fh,
        struct v4l2_queryctrl *ctrl)
{
    int ret = 0;

    switch (ctrl->id) {
    case V4L2_CID_ROTATE:
        ret = v4l2_ctrl_query_fill(ctrl, 0, 270, 90, 0);
        break;
    case V4L2_CID_BG_COLOR:
        ret = v4l2_ctrl_query_fill(ctrl, 0, 0xFFFFFF, 1, 0);
        break;
    case V4L2_CID_VFLIP:
        ret = v4l2_ctrl_query_fill(ctrl, 0, 1, 1, 0);
        break;
    default:
        ctrl->name[0] = '\0';
        ret = -EINVAL;
    }
    return ret;
}

static int vidioc_g_ctrl(struct file *file, void *fh, struct v4l2_control *ctrl)
{
    int ret = 0;
    struct omap_vout_device *vout = fh;

    switch (ctrl->id) {
    case V4L2_CID_ROTATE:
        ctrl->value = vout->control[0].value;
        break;
    case V4L2_CID_BG_COLOR:
    {
        struct omap_overlay_manager_info info;
        struct omap_overlay *ovl;

        ovl = vout->vid_info.overlays[0];
        if (!ovl->manager || !ovl->manager->get_manager_info) {
            ret = -EINVAL;
            break;
        }

        ovl->manager->get_manager_info(ovl->manager, &info);
        ctrl->value = info.default_color;
        break;
    }
    case V4L2_CID_VFLIP:
        ctrl->value = vout->control[2].value;
        break;
    default:
        ret = -EINVAL;
    }
    return ret;
}

static int vidioc_s_ctrl(struct file *file, void *fh, struct v4l2_control *a)
{
    int ret = 0;
    struct omap_vout_device *vout = fh;

    switch (a->id) {
    case V4L2_CID_ROTATE:
    {
        struct omapvideo_info *ovid;
        int rotation = a->value;

        ovid = &vout->vid_info;

        mutex_lock(&vout->lock);
        if (rotation && ovid->rotation_type == VOUT_ROT_NONE) {
            mutex_unlock(&vout->lock);
            ret = -ERANGE;
            break;
        }

        if (rotation && vout->pix.pixelformat == V4L2_PIX_FMT_RGB24) {
            mutex_unlock(&vout->lock);
            ret = -EINVAL;
            break;
        }

        if (v4l2_rot_to_dss_rot(rotation, &vout->rotation,
                            vout->mirror)) {
            mutex_unlock(&vout->lock);
            ret = -EINVAL;
            break;
        }

        vout->control[0].value = rotation;
        mutex_unlock(&vout->lock);
        break;
    }
    case V4L2_CID_BG_COLOR:
    {
        struct omap_overlay *ovl;
        unsigned int  color = a->value;
        struct omap_overlay_manager_info info;

        ovl = vout->vid_info.overlays[0];

        mutex_lock(&vout->lock);
        if (!ovl->manager || !ovl->manager->get_manager_info) {
            mutex_unlock(&vout->lock);
            ret = -EINVAL;
            break;
        }

        ovl->manager->get_manager_info(ovl->manager, &info);
        info.default_color = color;
        if (ovl->manager->set_manager_info(ovl->manager, &info)) {
            mutex_unlock(&vout->lock);
            ret = -EINVAL;
            break;
        }

        vout->control[1].value = color;
        mutex_unlock(&vout->lock);
        break;
    }
    case V4L2_CID_VFLIP:
    {
        struct omap_overlay *ovl;
        struct omapvideo_info *ovid;
        unsigned int  mirror = a->value;

        ovid = &vout->vid_info;
        ovl = ovid->overlays[0];

        mutex_lock(&vout->lock);
        if (mirror && ovid->rotation_type == VOUT_ROT_NONE) {
            mutex_unlock(&vout->lock);
            ret = -ERANGE;
            break;
        }

        if (mirror  && vout->pix.pixelformat == V4L2_PIX_FMT_RGB24) {
            mutex_unlock(&vout->lock);
            ret = -EINVAL;
            break;
        }
        vout->mirror = mirror;
        vout->control[2].value = mirror;
        mutex_unlock(&vout->lock);
        break;
    }
    default:
        ret = -EINVAL;
    }
    return ret;
}

static int vidioc_reqbufs(struct file *file, void *fh,
            struct v4l2_requestbuffers *req)
{
    int ret = 0;
    unsigned int i, num_buffers = 0;
    struct omap_vout_device *vout = fh;
    struct videobuf_queue *q = &vout->vbq;

    if ((req->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) || (req->count < 0))
        return -EINVAL;
    /* if memory is not mmp or userptr
       return error */
    if ((V4L2_MEMORY_MMAP != req->memory) &&
            (V4L2_MEMORY_USERPTR != req->memory))
        return -EINVAL;

    mutex_lock(&vout->lock);
    /* Cannot be requested when streaming is on */
    if (vout->streaming) {
        ret = -EBUSY;
        goto reqbuf_err;
    }

    /* If buffers are already allocated free them */
    if (q->bufs[0] && (V4L2_MEMORY_MMAP == q->bufs[0]->memory)) {
        if (vout->mmap_count) {
            ret = -EBUSY;
            goto reqbuf_err;
        }
        num_buffers = (vout->vid == OMAP_VIDEO1) ?
            video1_numbuffers : video2_numbuffers;
        for (i = num_buffers; i < vout->buffer_allocated; i++) {
            omap_vout_free_buffer(vout->buf_virt_addr[i],
                    vout->buffer_size);
            vout->buf_virt_addr[i] = 0;
            vout->buf_phy_addr[i] = 0;
        }
        vout->buffer_allocated = num_buffers;
        videobuf_mmap_free(q);
    } else if (q->bufs[0] && (V4L2_MEMORY_USERPTR == q->bufs[0]->memory)) {
        if (vout->buffer_allocated) {
            videobuf_mmap_free(q);
            for (i = 0; i < vout->buffer_allocated; i++) {
                kfree(q->bufs[i]);
                q->bufs[i] = NULL;
            }
            vout->buffer_allocated = 0;
        }
    }

    /*store the memory type in data structure */
    vout->memory = req->memory;

    INIT_LIST_HEAD(&vout->dma_queue);

    /* call videobuf_reqbufs api */
    ret = videobuf_reqbufs(q, req);
    if (ret < 0)
        goto reqbuf_err;

    vout->buffer_allocated = req->count;

reqbuf_err:
    mutex_unlock(&vout->lock);
    return ret;
}

static int vidioc_querybuf(struct file *file, void *fh,
            struct v4l2_buffer *b)
{
    struct omap_vout_device *vout = fh;

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

static int vidioc_qbuf(struct file *file, void *fh,
            struct v4l2_buffer *buffer)
{
    struct omap_vout_device *vout = fh;
    struct videobuf_queue *q = &vout->vbq;

    if ((V4L2_BUF_TYPE_VIDEO_OUTPUT != buffer->type) ||
            (buffer->index >= vout->buffer_allocated) ||
            (q->bufs[buffer->index]->memory != buffer->memory)) {
        return -EINVAL;
    }
    if (V4L2_MEMORY_USERPTR == buffer->memory) {
        if ((buffer->length < vout->pix.sizeimage) ||
                (0 == buffer->m.userptr)) {
            return -EINVAL;
        }
    }

    if ((is_rotation_enabled(vout)) &&
            vout->vrfb_dma_tx.req_status == DMA_CHAN_NOT_ALLOTED) {
        v4l2_warn(&vout->vid_dev->v4l2_dev,
                "DMA Channel not allocated for Rotation\n");
        return -EINVAL;
    }

    return videobuf_qbuf(q, buffer);
}

static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
{
    struct omap_vout_device *vout = fh;
    struct videobuf_queue *q = &vout->vbq;

    int ret;
    u32 addr;
    unsigned long size;
    struct videobuf_buffer *vb;

    vb = q->bufs[b->index];

    if (!vout->streaming)
        return -EINVAL;

    if (file->f_flags & O_NONBLOCK)
        /* Call videobuf_dqbuf for non blocking mode */
        ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 1);
    else
        /* Call videobuf_dqbuf for  blocking mode */
        ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 0);

    addr = (unsigned long) vout->buf_phy_addr[vb->i];
    size = (unsigned long) vb->size;
    dma_unmap_single(vout->vid_dev->v4l2_dev.dev,  addr,
                size, DMA_TO_DEVICE);
    return ret;
}

static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
{
    int ret = 0, j;
    u32 addr = 0, mask = 0;
    struct omap_vout_device *vout = fh;
    struct videobuf_queue *q = &vout->vbq;
    struct omapvideo_info *ovid = &vout->vid_info;

    mutex_lock(&vout->lock);

    if (vout->streaming) {
        ret = -EBUSY;
        goto streamon_err;
    }

    ret = videobuf_streamon(q);
    if (ret)
        goto streamon_err;

    if (list_empty(&vout->dma_queue)) {
        ret = -EIO;
        goto streamon_err1;
    }

    /* Get the next frame from the buffer queue */
    vout->next_frm = vout->cur_frm = list_entry(vout->dma_queue.next,
            struct videobuf_buffer, queue);
    /* Remove buffer from the buffer queue */
    list_del(&vout->cur_frm->queue);
    /* Mark state of the current frame to active */
    vout->cur_frm->state = VIDEOBUF_ACTIVE;
    /* Initialize field_id and started member */
    vout->field_id = 0;

    /* set flag here. Next QBUF will start DMA */
    vout->streaming = 1;

    vout->first_int = 1;

    if (omap_vout_calculate_offset(vout)) {
        ret = -EINVAL;
        goto streamon_err1;
    }
    addr = (unsigned long) vout->queued_buf_addr[vout->cur_frm->i]
        + vout->cropped_offset;

    mask = DISPC_IRQ_VSYNC | DISPC_IRQ_EVSYNC_EVEN | DISPC_IRQ_EVSYNC_ODD
        | DISPC_IRQ_VSYNC2;

    omap_dispc_register_isr(omap_vout_isr, vout, mask);

    for (j = 0; j < ovid->num_overlays; j++) {
        struct omap_overlay *ovl = ovid->overlays[j];

        if (ovl->get_device(ovl)) {
            struct omap_overlay_info info;
            ovl->get_overlay_info(ovl, &info);
            info.paddr = addr;
            if (ovl->set_overlay_info(ovl, &info)) {
                ret = -EINVAL;
                goto streamon_err1;
            }
        }
    }

    /* First save the configuration in ovelray structure */
    ret = omapvid_init(vout, addr);
    if (ret)
        v4l2_err(&vout->vid_dev->v4l2_dev,
                "failed to set overlay info\n");
    /* Enable the pipeline and set the Go bit */
    ret = omapvid_apply_changes(vout);
    if (ret)
        v4l2_err(&vout->vid_dev->v4l2_dev, "failed to change mode\n");

    for (j = 0; j < ovid->num_overlays; j++) {
        struct omap_overlay *ovl = ovid->overlays[j];
        struct omap_dss_device *dssdev = ovl->get_device(ovl);

        if (dssdev) {
            ret = ovl->enable(ovl);
            if (ret)
                goto streamon_err1;
        }
    }

    ret = 0;

streamon_err1:
    if (ret)
        ret = videobuf_streamoff(q);
streamon_err:
    mutex_unlock(&vout->lock);
    return ret;
}

static int vidioc_streamoff(struct file *file, void *fh, enum v4l2_buf_type i)
{
    u32 mask = 0;
    int ret = 0, j;
    struct omap_vout_device *vout = fh;
    struct omapvideo_info *ovid = &vout->vid_info;

    if (!vout->streaming)
        return -EINVAL;

    vout->streaming = 0;
    mask = DISPC_IRQ_VSYNC | DISPC_IRQ_EVSYNC_EVEN | DISPC_IRQ_EVSYNC_ODD
        | DISPC_IRQ_VSYNC2;

    omap_dispc_unregister_isr(omap_vout_isr, vout, mask);

    for (j = 0; j < ovid->num_overlays; j++) {
        struct omap_overlay *ovl = ovid->overlays[j];
        struct omap_dss_device *dssdev = ovl->get_device(ovl);

        if (dssdev)
            ovl->disable(ovl);
    }

    /* Turn of the pipeline */
    ret = omapvid_apply_changes(vout);
    if (ret)
        v4l2_err(&vout->vid_dev->v4l2_dev, "failed to change mode in"
                " streamoff\n");

    INIT_LIST_HEAD(&vout->dma_queue);
    ret = videobuf_streamoff(&vout->vbq);

    return ret;
}

static int vidioc_s_fbuf(struct file *file, void *fh,
                const struct v4l2_framebuffer *a)
{
    int enable = 0;
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct omap_vout_device *vout = fh;
    struct omap_overlay_manager_info info;
    enum omap_dss_trans_key_type key_type = OMAP_DSS_COLOR_KEY_GFX_DST;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    /* OMAP DSS doesn't support Source and Destination color
       key together */
    if ((a->flags & V4L2_FBUF_FLAG_SRC_CHROMAKEY) &&
            (a->flags & V4L2_FBUF_FLAG_CHROMAKEY))
        return -EINVAL;
    /* OMAP DSS Doesn't support the Destination color key
       and alpha blending together */
    if ((a->flags & V4L2_FBUF_FLAG_CHROMAKEY) &&
            (a->flags & V4L2_FBUF_FLAG_LOCAL_ALPHA))
        return -EINVAL;

    if ((a->flags & V4L2_FBUF_FLAG_SRC_CHROMAKEY)) {
        vout->fbuf.flags |= V4L2_FBUF_FLAG_SRC_CHROMAKEY;
        key_type =  OMAP_DSS_COLOR_KEY_VID_SRC;
    } else
        vout->fbuf.flags &= ~V4L2_FBUF_FLAG_SRC_CHROMAKEY;

    if ((a->flags & V4L2_FBUF_FLAG_CHROMAKEY)) {
        vout->fbuf.flags |= V4L2_FBUF_FLAG_CHROMAKEY;
        key_type =  OMAP_DSS_COLOR_KEY_GFX_DST;
    } else
        vout->fbuf.flags &=  ~V4L2_FBUF_FLAG_CHROMAKEY;

    if (a->flags & (V4L2_FBUF_FLAG_CHROMAKEY |
                V4L2_FBUF_FLAG_SRC_CHROMAKEY))
        enable = 1;
    else
        enable = 0;
    if (ovl->manager && ovl->manager->get_manager_info &&
            ovl->manager->set_manager_info) {

        ovl->manager->get_manager_info(ovl->manager, &info);
        info.trans_enabled = enable;
        info.trans_key_type = key_type;
        info.trans_key = vout->win.chromakey;

        if (ovl->manager->set_manager_info(ovl->manager, &info))
            return -EINVAL;
    }
    if (a->flags & V4L2_FBUF_FLAG_LOCAL_ALPHA) {
        vout->fbuf.flags |= V4L2_FBUF_FLAG_LOCAL_ALPHA;
        enable = 1;
    } else {
        vout->fbuf.flags &= ~V4L2_FBUF_FLAG_LOCAL_ALPHA;
        enable = 0;
    }
    if (ovl->manager && ovl->manager->get_manager_info &&
            ovl->manager->set_manager_info) {
        ovl->manager->get_manager_info(ovl->manager, &info);
        /* enable this only if there is no zorder cap */
        if ((ovl->caps & OMAP_DSS_OVL_CAP_ZORDER) == 0)
            info.partial_alpha_enabled = enable;
        if (ovl->manager->set_manager_info(ovl->manager, &info))
            return -EINVAL;
    }

    return 0;
}

static int vidioc_g_fbuf(struct file *file, void *fh,
        struct v4l2_framebuffer *a)
{
    struct omap_overlay *ovl;
    struct omapvideo_info *ovid;
    struct omap_vout_device *vout = fh;
    struct omap_overlay_manager_info info;

    ovid = &vout->vid_info;
    ovl = ovid->overlays[0];

    /* The video overlay must stay within the framebuffer and can't be
       positioned independently. */
    a->flags = V4L2_FBUF_FLAG_OVERLAY;
    a->capability = V4L2_FBUF_CAP_LOCAL_ALPHA | V4L2_FBUF_CAP_CHROMAKEY
        | V4L2_FBUF_CAP_SRC_CHROMAKEY;

    if (ovl->manager && ovl->manager->get_manager_info) {
        ovl->manager->get_manager_info(ovl->manager, &info);
        if (info.trans_key_type == OMAP_DSS_COLOR_KEY_VID_SRC)
            a->flags |= V4L2_FBUF_FLAG_SRC_CHROMAKEY;
        if (info.trans_key_type == OMAP_DSS_COLOR_KEY_GFX_DST)
            a->flags |= V4L2_FBUF_FLAG_CHROMAKEY;
    }
    if (ovl->manager && ovl->manager->get_manager_info) {
        ovl->manager->get_manager_info(ovl->manager, &info);
        if (info.partial_alpha_enabled)
            a->flags |= V4L2_FBUF_FLAG_LOCAL_ALPHA;
    }

    return 0;
}

static const struct v4l2_ioctl_ops vout_ioctl_ops = {
    .vidioc_querycap                = vidioc_querycap,
    .vidioc_enum_fmt_vid_out        = vidioc_enum_fmt_vid_out,
    .vidioc_g_fmt_vid_out           = vidioc_g_fmt_vid_out,
    .vidioc_try_fmt_vid_out         = vidioc_try_fmt_vid_out,
    .vidioc_s_fmt_vid_out           = vidioc_s_fmt_vid_out,
    .vidioc_queryctrl               = vidioc_queryctrl,
    .vidioc_g_ctrl                  = vidioc_g_ctrl,
    .vidioc_s_fbuf              = vidioc_s_fbuf,
    .vidioc_g_fbuf              = vidioc_g_fbuf,
    .vidioc_s_ctrl                  = vidioc_s_ctrl,
    .vidioc_try_fmt_vid_overlay         = vidioc_try_fmt_vid_overlay,
    .vidioc_s_fmt_vid_overlay       = vidioc_s_fmt_vid_overlay,
    .vidioc_enum_fmt_vid_overlay        = vidioc_enum_fmt_vid_overlay,
    .vidioc_g_fmt_vid_overlay       = vidioc_g_fmt_vid_overlay,
    .vidioc_cropcap             = vidioc_cropcap,
    .vidioc_g_crop              = vidioc_g_crop,
    .vidioc_s_crop              = vidioc_s_crop,
    .vidioc_reqbufs             = vidioc_reqbufs,
    .vidioc_querybuf            = vidioc_querybuf,
    .vidioc_qbuf                = vidioc_qbuf,
    .vidioc_dqbuf               = vidioc_dqbuf,
    .vidioc_streamon            = vidioc_streamon,
    .vidioc_streamoff           = vidioc_streamoff,
};

static const struct v4l2_file_operations omap_vout_fops = {
    .owner      = THIS_MODULE,
    .poll       = omap_vout_poll,
    .unlocked_ioctl = video_ioctl2,
    .mmap       = omap_vout_mmap,
    .open       = omap_vout_open,
    .release    = omap_vout_release,
};

/* Init functions used during driver initialization */
/* Initial setup of video_data */
static int __init omap_vout_setup_video_data(struct omap_vout_device *vout)
{
    struct video_device *vfd;
    struct v4l2_pix_format *pix;
    struct v4l2_control *control;
    struct omap_overlay *ovl = vout->vid_info.overlays[0];
    struct omap_dss_device *display = ovl->get_device(ovl);

    /* set the default pix */
    pix = &vout->pix;

    /* Set the default picture of QVGA  */
    pix->width = QQVGA_WIDTH;
    pix->height = QQVGA_HEIGHT;

    /* Default pixel format is RGB 5-6-5 */
    pix->pixelformat = V4L2_PIX_FMT_RGB565;
    pix->field = V4L2_FIELD_ANY;
    pix->bytesperline = pix->width * 2;
    pix->sizeimage = pix->bytesperline * pix->height;
    pix->priv = 0;
    pix->colorspace = V4L2_COLORSPACE_JPEG;

    vout->bpp = RGB565_BPP;
    vout->fbuf.fmt.width  =  display->panel.timings.x_res;
    vout->fbuf.fmt.height =  display->panel.timings.y_res;

    /* Set the data structures for the overlay parameters*/
    vout->win.global_alpha = 255;
    vout->fbuf.flags = 0;
    vout->fbuf.capability = V4L2_FBUF_CAP_LOCAL_ALPHA |
        V4L2_FBUF_CAP_SRC_CHROMAKEY | V4L2_FBUF_CAP_CHROMAKEY;
    vout->win.chromakey = 0;

    omap_vout_new_format(pix, &vout->fbuf, &vout->crop, &vout->win);

    /*Initialize the control variables for
      rotation, flipping and background color. */
    control = vout->control;
    control[0].id = V4L2_CID_ROTATE;
    control[0].value = 0;
    vout->rotation = 0;
    vout->mirror = 0;
    vout->control[2].id = V4L2_CID_HFLIP;
    vout->control[2].value = 0;
    if (vout->vid_info.rotation_type == VOUT_ROT_VRFB)
        vout->vrfb_bpp = 2;

    control[1].id = V4L2_CID_BG_COLOR;
    control[1].value = 0;

    /* initialize the video_device struct */
    vfd = vout->vfd = video_device_alloc();

    if (!vfd) {
        printk(KERN_ERR VOUT_NAME ": could not allocate"
                " video device struct\n");
        return -ENOMEM;
    }
    vfd->release = video_device_release;
    vfd->ioctl_ops = &vout_ioctl_ops;

    strlcpy(vfd->name, VOUT_NAME, sizeof(vfd->name));

    vfd->fops = &omap_vout_fops;
    vfd->v4l2_dev = &vout->vid_dev->v4l2_dev;
    vfd->vfl_dir = VFL_DIR_TX;
    mutex_init(&vout->lock);

    vfd->minor = -1;
    return 0;

}

/* Setup video buffers */
static int __init omap_vout_setup_video_bufs(struct platform_device *pdev,
        int vid_num)
{
    u32 numbuffers;
    int ret = 0, i;
    struct omapvideo_info *ovid;
    struct omap_vout_device *vout;
    struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
    struct omap2video_device *vid_dev =
        container_of(v4l2_dev, struct omap2video_device, v4l2_dev);

    vout = vid_dev->vouts[vid_num];
    ovid = &vout->vid_info;

    numbuffers = (vid_num == 0) ? video1_numbuffers : video2_numbuffers;
    vout->buffer_size = (vid_num == 0) ? video1_bufsize : video2_bufsize;
    dev_info(&pdev->dev, "Buffer Size = %d\n", vout->buffer_size);

    for (i = 0; i < numbuffers; i++) {
        vout->buf_virt_addr[i] =
            omap_vout_alloc_buffer(vout->buffer_size,
                    (u32 *) &vout->buf_phy_addr[i]);
        if (!vout->buf_virt_addr[i]) {
            numbuffers = i;
            ret = -ENOMEM;
            goto free_buffers;
        }
    }

    vout->cropped_offset = 0;

    if (ovid->rotation_type == VOUT_ROT_VRFB) {
        int static_vrfb_allocation = (vid_num == 0) ?
            vid1_static_vrfb_alloc : vid2_static_vrfb_alloc;
        ret = omap_vout_setup_vrfb_bufs(pdev, vid_num,
                static_vrfb_allocation);
    }

    return ret;

free_buffers:
    for (i = 0; i < numbuffers; i++) {
        omap_vout_free_buffer(vout->buf_virt_addr[i],
                        vout->buffer_size);
        vout->buf_virt_addr[i] = 0;
        vout->buf_phy_addr[i] = 0;
    }
    return ret;

}

/* Create video out devices */
static int __init omap_vout_create_video_devices(struct platform_device *pdev)
{
    int ret = 0, k;
    struct omap_vout_device *vout;
    struct video_device *vfd = NULL;
    struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
    struct omap2video_device *vid_dev = container_of(v4l2_dev,
            struct omap2video_device, v4l2_dev);

    for (k = 0; k < pdev->num_resources; k++) {

        vout = kzalloc(sizeof(struct omap_vout_device), GFP_KERNEL);
        if (!vout) {
            dev_err(&pdev->dev, ": could not allocate memory\n");
            return -ENOMEM;
        }

        vout->vid = k;
        vid_dev->vouts[k] = vout;
        vout->vid_dev = vid_dev;
        /* Select video2 if only 1 overlay is controlled by V4L2 */
        if (pdev->num_resources == 1)
            vout->vid_info.overlays[0] = vid_dev->overlays[k + 2];
        else
            /* Else select video1 and video2 one by one. */
            vout->vid_info.overlays[0] = vid_dev->overlays[k + 1];
        vout->vid_info.num_overlays = 1;
        vout->vid_info.id = k + 1;

        /* Set VRFB as rotation_type for omap2 and omap3 */
        if (cpu_is_omap24xx() || cpu_is_omap34xx())
            vout->vid_info.rotation_type = VOUT_ROT_VRFB;

        /* Setup the default configuration for the video devices
         */
        if (omap_vout_setup_video_data(vout) != 0) {
            ret = -ENOMEM;
            goto error;
        }

        /* Allocate default number of buffers for the video streaming
         * and reserve the VRFB space for rotation
         */
        if (omap_vout_setup_video_bufs(pdev, k) != 0) {
            ret = -ENOMEM;
            goto error1;
        }

        /* Register the Video device with V4L2
         */
        vfd = vout->vfd;
        if (video_register_device(vfd, VFL_TYPE_GRABBER, -1) < 0) {
            dev_err(&pdev->dev, ": Could not register "
                    "Video for Linux device\n");
            vfd->minor = -1;
            ret = -ENODEV;
            goto error2;
        }
        video_set_drvdata(vfd, vout);

        /* Configure the overlay structure */
        ret = omapvid_init(vid_dev->vouts[k], 0);
        if (!ret)
            goto success;

error2:
        if (vout->vid_info.rotation_type == VOUT_ROT_VRFB)
            omap_vout_release_vrfb(vout);
        omap_vout_free_buffers(vout);
error1:
        video_device_release(vfd);
error:
        kfree(vout);
        return ret;

success:
        dev_info(&pdev->dev, ": registered and initialized"
                " video device %d\n", vfd->minor);
        if (k == (pdev->num_resources - 1))
            return 0;
    }

    return -ENODEV;
}
/* Driver functions */
static void omap_vout_cleanup_device(struct omap_vout_device *vout)
{
    struct video_device *vfd;
    struct omapvideo_info *ovid;

    if (!vout)
        return;

    vfd = vout->vfd;
    ovid = &vout->vid_info;
    if (vfd) {
        if (!video_is_registered(vfd)) {
            /*
             * The device was never registered, so release the
             * video_device struct directly.
             */
            video_device_release(vfd);
        } else {
            /*
             * The unregister function will release the video_device
             * struct as well as unregistering it.
             */
            video_unregister_device(vfd);
        }
    }
    if (ovid->rotation_type == VOUT_ROT_VRFB) {
        omap_vout_release_vrfb(vout);
        /* Free the VRFB buffer if allocated
         * init time
         */
        if (vout->vrfb_static_allocation)
            omap_vout_free_vrfb_buffers(vout);
    }
    omap_vout_free_buffers(vout);

    kfree(vout);
}

static int omap_vout_remove(struct platform_device *pdev)
{
    int k;
    struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
    struct omap2video_device *vid_dev = container_of(v4l2_dev, struct
            omap2video_device, v4l2_dev);

    v4l2_device_unregister(v4l2_dev);
    for (k = 0; k < pdev->num_resources; k++)
        omap_vout_cleanup_device(vid_dev->vouts[k]);

    for (k = 0; k < vid_dev->num_displays; k++) {
        if (vid_dev->displays[k]->state != OMAP_DSS_DISPLAY_DISABLED)
            vid_dev->displays[k]->driver->disable(vid_dev->displays[k]);

        omap_dss_put_device(vid_dev->displays[k]);
    }
    kfree(vid_dev);
    return 0;
}

static int __init omap_vout_probe(struct platform_device *pdev)
{
    int ret = 0, i;
    struct omap_overlay *ovl;
    struct omap_dss_device *dssdev = NULL;
    struct omap_dss_device *def_display;
    struct omap2video_device *vid_dev = NULL;

    if (pdev->num_resources == 0) {
        dev_err(&pdev->dev, "probed for an unknown device\n");
        return -ENODEV;
    }

    vid_dev = kzalloc(sizeof(struct omap2video_device), GFP_KERNEL);
    if (vid_dev == NULL)
        return -ENOMEM;

    vid_dev->num_displays = 0;
    for_each_dss_dev(dssdev) {
        omap_dss_get_device(dssdev);

        if (!dssdev->driver) {
            dev_warn(&pdev->dev, "no driver for display: %s\n",
                    dssdev->name);
            omap_dss_put_device(dssdev);
            continue;
        }

        vid_dev->displays[vid_dev->num_displays++] = dssdev;
    }

    if (vid_dev->num_displays == 0) {
        dev_err(&pdev->dev, "no displays\n");
        ret = -EINVAL;
        goto probe_err0;
    }

    vid_dev->num_overlays = omap_dss_get_num_overlays();
    for (i = 0; i < vid_dev->num_overlays; i++)
        vid_dev->overlays[i] = omap_dss_get_overlay(i);

    vid_dev->num_managers = omap_dss_get_num_overlay_managers();
    for (i = 0; i < vid_dev->num_managers; i++)
        vid_dev->managers[i] = omap_dss_get_overlay_manager(i);

    /* Get the Video1 overlay and video2 overlay.
     * Setup the Display attached to that overlays
     */
    for (i = 1; i < vid_dev->num_overlays; i++) {
        ovl = omap_dss_get_overlay(i);
        dssdev = ovl->get_device(ovl);

        if (dssdev) {
            def_display = dssdev;
        } else {
            dev_warn(&pdev->dev, "cannot find display\n");
            def_display = NULL;
        }
        if (def_display) {
            struct omap_dss_driver *dssdrv = def_display->driver;

            ret = dssdrv->enable(def_display);
            if (ret) {
                /* Here we are not considering a error
                 *  as display may be enabled by frame
                 *  buffer driver
                 */
                dev_warn(&pdev->dev,
                    "'%s' Display already enabled\n",
                    def_display->name);
            }
        }
    }

    if (v4l2_device_register(&pdev->dev, &vid_dev->v4l2_dev) < 0) {
        dev_err(&pdev->dev, "v4l2_device_register failed\n");
        ret = -ENODEV;
        goto probe_err1;
    }

    ret = omap_vout_create_video_devices(pdev);
    if (ret)
        goto probe_err2;

    for (i = 0; i < vid_dev->num_displays; i++) {
        struct omap_dss_device *display = vid_dev->displays[i];

        if (display->driver->update)
            display->driver->update(display, 0, 0,
                    display->panel.timings.x_res,
                    display->panel.timings.y_res);
    }
    return 0;

probe_err2:
    v4l2_device_unregister(&vid_dev->v4l2_dev);
probe_err1:
    for (i = 1; i < vid_dev->num_overlays; i++) {
        def_display = NULL;
        ovl = omap_dss_get_overlay(i);
        dssdev = ovl->get_device(ovl);

        if (dssdev)
            def_display = dssdev;

        if (def_display && def_display->driver)
            def_display->driver->disable(def_display);
    }
probe_err0:
    kfree(vid_dev);
    return ret;
}

static struct platform_driver omap_vout_driver = {
    .driver = {
        .name = VOUT_NAME,
    },
    .remove = omap_vout_remove,
};

static int __init omap_vout_init(void)
{
    if (platform_driver_probe(&omap_vout_driver, omap_vout_probe) != 0) {
        printk(KERN_ERR VOUT_NAME ":Could not register Video driver\n");
        return -EINVAL;
    }
    return 0;
}

static void omap_vout_cleanup(void)
{
    platform_driver_unregister(&omap_vout_driver);
}

late_initcall(omap_vout_init);
module_exit(omap_vout_cleanup);