/*
 * 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 (source@mvista.com)
 *
 * 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 <video/omapvrfb.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;

        /* For kernel direct-mapped memory, take the easy way */
        if (virtp >= PAGE_OFFSET)
                return virt_to_phys((void *) virtp);

        down_read(&current->mm->mmap_sem);
        vma = find_vma(mm, virtp);
        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);
                up_read(&current->mm->mmap_sem);
        } else {
                /* otherwise, use get_user_pages() for general userland pages */
                int res, nr_pages = 1;
                struct page *pages;

                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 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;
                break;
        }
        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);
        v4l2_get_timestamp(&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");
                goto vout_isr_err;
        }

        /* 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);

        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_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;

        /* 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");
                goto streamon_err1;
        }

        omap_dispc_register_isr(omap_vout_isr, vout, mask);

        /* 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_out_overlay         = vidioc_try_fmt_vid_overlay,
        .vidioc_s_fmt_vid_out_overlay           = vidioc_s_fmt_vid_overlay,
        .vidioc_g_fmt_vid_out_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 (omap_vout_dss_omap24xx() || omap_vout_dss_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);

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

                continue;
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;
        }

        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 (omapdss_is_initialized() == false)
                return -EPROBE_DEFER;

        ret = omapdss_compat_init();
        if (ret) {
                dev_err(&pdev->dev, "failed to init dss\n");
                return ret;
        }

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

        vid_dev = kzalloc(sizeof(struct omap2video_device), GFP_KERNEL);
        if (vid_dev == NULL) {
                ret = -ENOMEM;
                goto err_dss_init;
        }

        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);
err_dss_init:
        omapdss_compat_uninit();
        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);