kernel_samsung_msm8974/drivers/media/video/davinci/vpbe_display.c

/*
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/time.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <linux/slab.h>

#include <asm/pgtable.h>
#include <mach/cputype.h>

#include <media/v4l2-dev.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include <media/davinci/vpbe_display.h>
#include <media/davinci/vpbe_types.h>
#include <media/davinci/vpbe.h>
#include <media/davinci/vpbe_venc.h>
#include <media/davinci/vpbe_osd.h>
#include "vpbe_venc_regs.h"

#define VPBE_DISPLAY_DRIVER "vpbe-v4l2"

static int debug;

#define VPBE_DEFAULT_NUM_BUFS 3

module_param(debug, int, 0644);

static int venc_is_second_field(struct vpbe_display *disp_dev)
{
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int ret;
	int val;

	ret = v4l2_subdev_call(vpbe_dev->venc,
			       core,
			       ioctl,
			       VENC_GET_FLD,
			       &val);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			 "Error in getting Field ID 0\n");
	}
	return val;
}

static void vpbe_isr_even_field(struct vpbe_display *disp_obj,
				struct vpbe_layer *layer)
{
	struct timespec timevalue;

	if (layer->cur_frm == layer->next_frm)
		return;
	ktime_get_ts(&timevalue);
	layer->cur_frm->ts.tv_sec = timevalue.tv_sec;
	layer->cur_frm->ts.tv_usec = timevalue.tv_nsec / NSEC_PER_USEC;
	layer->cur_frm->state = VIDEOBUF_DONE;
	wake_up_interruptible(&layer->cur_frm->done);
	/* Make cur_frm pointing to next_frm */
	layer->cur_frm = layer->next_frm;
}

static void vpbe_isr_odd_field(struct vpbe_display *disp_obj,
				struct vpbe_layer *layer)
{
	struct osd_state *osd_device = disp_obj->osd_device;
	unsigned long addr;

	spin_lock(&disp_obj->dma_queue_lock);
	if (list_empty(&layer->dma_queue) ||
		(layer->cur_frm != layer->next_frm)) {
		spin_unlock(&disp_obj->dma_queue_lock);
		return;
	}
	/*
	 * one field is displayed configure
	 * the next frame if it is available
	 * otherwise hold on current frame
	 * Get next from the buffer queue
	 */
	layer->next_frm = list_entry(
				layer->dma_queue.next,
				struct  videobuf_buffer,
				queue);
	/* Remove that from the buffer queue */
	list_del(&layer->next_frm->queue);
	spin_unlock(&disp_obj->dma_queue_lock);
	/* Mark state of the frame to active */
	layer->next_frm->state = VIDEOBUF_ACTIVE;
	addr = videobuf_to_dma_contig(layer->next_frm);
	osd_device->ops.start_layer(osd_device,
			layer->layer_info.id,
			addr,
			disp_obj->cbcr_ofst);
}

/* interrupt service routine */
static irqreturn_t venc_isr(int irq, void *arg)
{
	struct vpbe_display *disp_dev = (struct vpbe_display *)arg;
	struct vpbe_layer *layer;
	static unsigned last_event;
	unsigned event = 0;
	int fid;
	int i;

	if ((NULL == arg) || (NULL == disp_dev->dev[0]))
		return IRQ_HANDLED;

	if (venc_is_second_field(disp_dev))
		event |= VENC_SECOND_FIELD;
	else
		event |= VENC_FIRST_FIELD;

	if (event == (last_event & ~VENC_END_OF_FRAME)) {
		/*
		* If the display is non-interlaced, then we need to flag the
		* end-of-frame event at every interrupt regardless of the
		* value of the FIDST bit.  We can conclude that the display is
		* non-interlaced if the value of the FIDST bit is unchanged
		* from the previous interrupt.
		*/
		event |= VENC_END_OF_FRAME;
	} else if (event == VENC_SECOND_FIELD) {
		/* end-of-frame for interlaced display */
		event |= VENC_END_OF_FRAME;
	}
	last_event = event;

	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		layer = disp_dev->dev[i];
		/* If streaming is started in this layer */
		if (!layer->started)
			continue;

		if (layer->layer_first_int) {
			layer->layer_first_int = 0;
			continue;
		}
		/* Check the field format */
		if ((V4L2_FIELD_NONE == layer->pix_fmt.field) &&
			(event & VENC_END_OF_FRAME)) {
			/* Progressive mode */

			vpbe_isr_even_field(disp_dev, layer);
			vpbe_isr_odd_field(disp_dev, layer);
		} else {
		/* Interlaced mode */

			layer->field_id ^= 1;
			if (event & VENC_FIRST_FIELD)
				fid = 0;
			else
				fid = 1;

			/*
			* If field id does not match with store
			* field id
			*/
			if (fid != layer->field_id) {
				/* Make them in sync */
				layer->field_id = fid;
				continue;
			}
			/*
			* device field id and local field id are
			* in sync. If this is even field
			*/
			if (0 == fid)
				vpbe_isr_even_field(disp_dev, layer);
			else  /* odd field */
				vpbe_isr_odd_field(disp_dev, layer);
		}
	}

	return IRQ_HANDLED;
}

/*
 * vpbe_buffer_prepare()
 * This is the callback function called from videobuf_qbuf() function
 * the buffer is prepared and user space virtual address is converted into
 * physical address
 */
static int vpbe_buffer_prepare(struct videobuf_queue *q,
				  struct videobuf_buffer *vb,
				  enum v4l2_field field)
{
	struct vpbe_fh *fh = q->priv_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned long addr;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
				"vpbe_buffer_prepare\n");

	/* If buffer is not initialized, initialize it */
	if (VIDEOBUF_NEEDS_INIT == vb->state) {
		vb->width = layer->pix_fmt.width;
		vb->height = layer->pix_fmt.height;
		vb->size = layer->pix_fmt.sizeimage;
		vb->field = field;

		ret = videobuf_iolock(q, vb, NULL);
		if (ret < 0) {
			v4l2_err(&vpbe_dev->v4l2_dev, "Failed to map \
				user address\n");
			return -EINVAL;
		}

		addr = videobuf_to_dma_contig(vb);

		if (q->streaming) {
			if (!IS_ALIGNED(addr, 8)) {
				v4l2_err(&vpbe_dev->v4l2_dev,
					"buffer_prepare:offset is \
					not aligned to 32 bytes\n");
				return -EINVAL;
			}
		}
		vb->state = VIDEOBUF_PREPARED;
	}
	return 0;
}

/*
 * vpbe_buffer_setup()
 * This function allocates memory for the buffers
 */
static int vpbe_buffer_setup(struct videobuf_queue *q,
				unsigned int *count,
				unsigned int *size)
{
	/* Get the file handle object and layer object */
	struct vpbe_fh *fh = q->priv_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_buffer_setup\n");

	*size = layer->pix_fmt.sizeimage;

	/* Store number of buffers allocated in numbuffer member */
	if (*count < VPBE_DEFAULT_NUM_BUFS)
		*count = layer->numbuffers = VPBE_DEFAULT_NUM_BUFS;

	return 0;
}

/*
 * vpbe_buffer_queue()
 * This function adds the buffer to DMA queue
 */
static void vpbe_buffer_queue(struct videobuf_queue *q,
				 struct videobuf_buffer *vb)
{
	/* Get the file handle object and layer object */
	struct vpbe_fh *fh = q->priv_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp = fh->disp_dev;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned long flags;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe_buffer_queue\n");

	/* add the buffer to the DMA queue */
	spin_lock_irqsave(&disp->dma_queue_lock, flags);
	list_add_tail(&vb->queue, &layer->dma_queue);
	spin_unlock_irqrestore(&disp->dma_queue_lock, flags);
	/* Change state of the buffer */
	vb->state = VIDEOBUF_QUEUED;
}

/*
 * vpbe_buffer_release()
 * This function is called from the videobuf layer to free memory allocated to
 * the buffers
 */
static void vpbe_buffer_release(struct videobuf_queue *q,
				   struct videobuf_buffer *vb)
{
	/* Get the file handle object and layer object */
	struct vpbe_fh *fh = q->priv_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe_buffer_release\n");

	if (V4L2_MEMORY_USERPTR != layer->memory)
		videobuf_dma_contig_free(q, vb);

	vb->state = VIDEOBUF_NEEDS_INIT;
}

static struct videobuf_queue_ops video_qops = {
	.buf_setup = vpbe_buffer_setup,
	.buf_prepare = vpbe_buffer_prepare,
	.buf_queue = vpbe_buffer_queue,
	.buf_release = vpbe_buffer_release,
};

static
struct vpbe_layer*
_vpbe_display_get_other_win_layer(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer)
{
	enum vpbe_display_device_id thiswin, otherwin;
	thiswin = layer->device_id;

	otherwin = (thiswin == VPBE_DISPLAY_DEVICE_0) ?
	VPBE_DISPLAY_DEVICE_1 : VPBE_DISPLAY_DEVICE_0;
	return disp_dev->dev[otherwin];
}

static int vpbe_set_osd_display_params(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer)
{
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct osd_state *osd_device = disp_dev->osd_device;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	unsigned long addr;
	int ret;

	addr = videobuf_to_dma_contig(layer->cur_frm);
	/* Set address in the display registers */
	osd_device->ops.start_layer(osd_device,
				    layer->layer_info.id,
				    addr,
				    disp_dev->cbcr_ofst);

	ret = osd_device->ops.enable_layer(osd_device,
				layer->layer_info.id, 0);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Error in enabling osd window layer 0\n");
		return -1;
	}

	/* Enable the window */
	layer->layer_info.enable = 1;
	if (cfg->pixfmt == PIXFMT_NV12) {
		struct vpbe_layer *otherlayer =
			_vpbe_display_get_other_win_layer(disp_dev, layer);

		ret = osd_device->ops.enable_layer(osd_device,
				otherlayer->layer_info.id, 1);
		if (ret < 0) {
			v4l2_err(&vpbe_dev->v4l2_dev,
				"Error in enabling osd window layer 1\n");
			return -1;
		}
		otherlayer->layer_info.enable = 1;
	}
	return 0;
}

static void
vpbe_disp_calculate_scale_factor(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer,
			int expected_xsize, int expected_ysize)
{
	struct display_layer_info *layer_info = &layer->layer_info;
	struct v4l2_pix_format *pixfmt = &layer->pix_fmt;
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int calculated_xsize;
	int h_exp = 0;
	int v_exp = 0;
	int h_scale;
	int v_scale;

	v4l2_std_id standard_id = vpbe_dev->current_timings.timings.std_id;

	/*
	 * Application initially set the image format. Current display
	 * size is obtained from the vpbe display controller. expected_xsize
	 * and expected_ysize are set through S_CROP ioctl. Based on this,
	 * driver will calculate the scale factors for vertical and
	 * horizontal direction so that the image is displayed scaled
	 * and expanded. Application uses expansion to display the image
	 * in a square pixel. Otherwise it is displayed using displays
	 * pixel aspect ratio.It is expected that application chooses
	 * the crop coordinates for cropped or scaled display. if crop
	 * size is less than the image size, it is displayed cropped or
	 * it is displayed scaled and/or expanded.
	 *
	 * to begin with, set the crop window same as expected. Later we
	 * will override with scaled window size
	 */

	cfg->xsize = pixfmt->width;
	cfg->ysize = pixfmt->height;
	layer_info->h_zoom = ZOOM_X1;	/* no horizontal zoom */
	layer_info->v_zoom = ZOOM_X1;	/* no horizontal zoom */
	layer_info->h_exp = H_EXP_OFF;	/* no horizontal zoom */
	layer_info->v_exp = V_EXP_OFF;	/* no horizontal zoom */

	if (pixfmt->width < expected_xsize) {
		h_scale = vpbe_dev->current_timings.xres / pixfmt->width;
		if (h_scale < 2)
			h_scale = 1;
		else if (h_scale >= 4)
			h_scale = 4;
		else
			h_scale = 2;
		cfg->xsize *= h_scale;
		if (cfg->xsize < expected_xsize) {
			if ((standard_id & V4L2_STD_525_60) ||
			(standard_id & V4L2_STD_625_50)) {
				calculated_xsize = (cfg->xsize *
					VPBE_DISPLAY_H_EXP_RATIO_N) /
					VPBE_DISPLAY_H_EXP_RATIO_D;
				if (calculated_xsize <= expected_xsize) {
					h_exp = 1;
					cfg->xsize = calculated_xsize;
				}
			}
		}
		if (h_scale == 2)
			layer_info->h_zoom = ZOOM_X2;
		else if (h_scale == 4)
			layer_info->h_zoom = ZOOM_X4;
		if (h_exp)
			layer_info->h_exp = H_EXP_9_OVER_8;
	} else {
		/* no scaling, only cropping. Set display area to crop area */
		cfg->xsize = expected_xsize;
	}

	if (pixfmt->height < expected_ysize) {
		v_scale = expected_ysize / pixfmt->height;
		if (v_scale < 2)
			v_scale = 1;
		else if (v_scale >= 4)
			v_scale = 4;
		else
			v_scale = 2;
		cfg->ysize *= v_scale;
		if (cfg->ysize < expected_ysize) {
			if ((standard_id & V4L2_STD_625_50)) {
				calculated_xsize = (cfg->ysize *
					VPBE_DISPLAY_V_EXP_RATIO_N) /
					VPBE_DISPLAY_V_EXP_RATIO_D;
				if (calculated_xsize <= expected_ysize) {
					v_exp = 1;
					cfg->ysize = calculated_xsize;
				}
			}
		}
		if (v_scale == 2)
			layer_info->v_zoom = ZOOM_X2;
		else if (v_scale == 4)
			layer_info->v_zoom = ZOOM_X4;
		if (v_exp)
			layer_info->h_exp = V_EXP_6_OVER_5;
	} else {
		/* no scaling, only cropping. Set display area to crop area */
		cfg->ysize = expected_ysize;
	}
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"crop display xsize = %d, ysize = %d\n",
		cfg->xsize, cfg->ysize);
}

static void vpbe_disp_adj_position(struct vpbe_display *disp_dev,
			struct vpbe_layer *layer,
			int top, int left)
{
	struct osd_layer_config *cfg = &layer->layer_info.config;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;

	cfg->xpos = min((unsigned int)left,
			vpbe_dev->current_timings.xres - cfg->xsize);
	cfg->ypos = min((unsigned int)top,
			vpbe_dev->current_timings.yres - cfg->ysize);

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"new xpos = %d, ypos = %d\n",
		cfg->xpos, cfg->ypos);
}

static void vpbe_disp_check_window_params(struct vpbe_display *disp_dev,
			struct v4l2_rect *c)
{
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;

	if ((c->width == 0) ||
	  ((c->width + c->left) > vpbe_dev->current_timings.xres))
		c->width = vpbe_dev->current_timings.xres - c->left;

	if ((c->height == 0) || ((c->height + c->top) >
	  vpbe_dev->current_timings.yres))
		c->height = vpbe_dev->current_timings.yres - c->top;

	/* window height must be even for interlaced display */
	if (vpbe_dev->current_timings.interlaced)
		c->height &= (~0x01);

}

/**
 * vpbe_try_format()
 * If user application provides width and height, and have bytesperline set
 * to zero, driver calculates bytesperline and sizeimage based on hardware
 * limits.
 */
static int vpbe_try_format(struct vpbe_display *disp_dev,
			struct v4l2_pix_format *pixfmt, int check)
{
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	int min_height = 1;
	int min_width = 32;
	int max_height;
	int max_width;
	int bpp;

	if ((pixfmt->pixelformat != V4L2_PIX_FMT_UYVY) &&
	    (pixfmt->pixelformat != V4L2_PIX_FMT_NV12))
		/* choose default as V4L2_PIX_FMT_UYVY */
		pixfmt->pixelformat = V4L2_PIX_FMT_UYVY;

	/* Check the field format */
	if ((pixfmt->field != V4L2_FIELD_INTERLACED) &&
		(pixfmt->field != V4L2_FIELD_NONE)) {
		if (vpbe_dev->current_timings.interlaced)
			pixfmt->field = V4L2_FIELD_INTERLACED;
		else
			pixfmt->field = V4L2_FIELD_NONE;
	}

	if (pixfmt->field == V4L2_FIELD_INTERLACED)
		min_height = 2;

	if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12)
		bpp = 1;
	else
		bpp = 2;

	max_width = vpbe_dev->current_timings.xres;
	max_height = vpbe_dev->current_timings.yres;

	min_width /= bpp;

	if (!pixfmt->width || (pixfmt->width < min_width) ||
		(pixfmt->width > max_width)) {
		pixfmt->width = vpbe_dev->current_timings.xres;
	}

	if (!pixfmt->height || (pixfmt->height  < min_height) ||
		(pixfmt->height  > max_height)) {
		pixfmt->height = vpbe_dev->current_timings.yres;
	}

	if (pixfmt->bytesperline < (pixfmt->width * bpp))
		pixfmt->bytesperline = pixfmt->width * bpp;

	/* Make the bytesperline 32 byte aligned */
	pixfmt->bytesperline = ((pixfmt->width * bpp + 31) & ~31);

	if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12)
		pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height +
				(pixfmt->bytesperline * pixfmt->height >> 1);
	else
		pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;

	return 0;
}

static int vpbe_display_g_priority(struct file *file, void *priv,
				enum v4l2_priority *p)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;

	*p = v4l2_prio_max(&layer->prio);

	return 0;
}

static int vpbe_display_s_priority(struct file *file, void *priv,
				enum v4l2_priority p)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	int ret;

	ret = v4l2_prio_change(&layer->prio, &fh->prio, p);

	return ret;
}

static int vpbe_display_querycap(struct file *file, void  *priv,
			       struct v4l2_capability *cap)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	cap->version = VPBE_DISPLAY_VERSION_CODE;
	cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
	strlcpy(cap->driver, VPBE_DISPLAY_DRIVER, sizeof(cap->driver));
	strlcpy(cap->bus_info, "platform", sizeof(cap->bus_info));
	strlcpy(cap->card, vpbe_dev->cfg->module_name, sizeof(cap->card));

	return 0;
}

static int vpbe_display_s_crop(struct file *file, void *priv,
			     struct v4l2_crop *crop)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_layer_config *cfg = &layer->layer_info.config;
	struct osd_state *osd_device = disp_dev->osd_device;
	struct v4l2_rect *rect = &crop->c;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_S_CROP, layer id = %d\n", layer->device_id);

	if (crop->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buf type\n");
		return -EINVAL;
	}

	if (rect->top < 0)
		rect->top = 0;
	if (rect->left < 0)
		rect->left = 0;

	vpbe_disp_check_window_params(disp_dev, rect);

	osd_device->ops.get_layer_config(osd_device,
			layer->layer_info.id, cfg);

	vpbe_disp_calculate_scale_factor(disp_dev, layer,
					rect->width,
					rect->height);
	vpbe_disp_adj_position(disp_dev, layer, rect->top,
					rect->left);
	ret = osd_device->ops.set_layer_config(osd_device,
				layer->layer_info.id, cfg);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Error in set layer config:\n");
		return -EINVAL;
	}

	/* apply zooming and h or v expansion */
	osd_device->ops.set_zoom(osd_device,
			layer->layer_info.id,
			layer->layer_info.h_zoom,
			layer->layer_info.v_zoom);
	ret = osd_device->ops.set_vid_expansion(osd_device,
			layer->layer_info.h_exp,
			layer->layer_info.v_exp);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
		"Error in set vid expansion:\n");
		return -EINVAL;
	}

	if ((layer->layer_info.h_zoom != ZOOM_X1) ||
		(layer->layer_info.v_zoom != ZOOM_X1) ||
		(layer->layer_info.h_exp != H_EXP_OFF) ||
		(layer->layer_info.v_exp != V_EXP_OFF))
		/* Enable expansion filter */
		osd_device->ops.set_interpolation_filter(osd_device, 1);
	else
		osd_device->ops.set_interpolation_filter(osd_device, 0);

	return 0;
}

static int vpbe_display_g_crop(struct file *file, void *priv,
			     struct v4l2_crop *crop)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct osd_layer_config *cfg = &layer->layer_info.config;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct osd_state *osd_device = fh->disp_dev->osd_device;
	struct v4l2_rect *rect = &crop->c;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_G_CROP, layer id = %d\n",
			layer->device_id);

	if (crop->type != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buf type\n");
		ret = -EINVAL;
	}
	osd_device->ops.get_layer_config(osd_device,
				layer->layer_info.id, cfg);
	rect->top = cfg->ypos;
	rect->left = cfg->xpos;
	rect->width = cfg->xsize;
	rect->height = cfg->ysize;

	return 0;
}

static int vpbe_display_cropcap(struct file *file, void *priv,
			      struct v4l2_cropcap *cropcap)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_CROPCAP ioctl\n");

	cropcap->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	cropcap->bounds.left = 0;
	cropcap->bounds.top = 0;
	cropcap->bounds.width = vpbe_dev->current_timings.xres;
	cropcap->bounds.height = vpbe_dev->current_timings.yres;
	cropcap->pixelaspect = vpbe_dev->current_timings.aspect;
	cropcap->defrect = cropcap->bounds;
	return 0;
}

static int vpbe_display_g_fmt(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_G_FMT, layer id = %d\n",
			layer->device_id);

	/* If buffer type is video output */
	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != fmt->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "invalid type\n");
		return -EINVAL;
	}
	/* Fill in the information about format */
	fmt->fmt.pix = layer->pix_fmt;

	return 0;
}

static int vpbe_display_enum_fmt(struct file *file, void  *priv,
				   struct v4l2_fmtdesc *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned int index = 0;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
				"VIDIOC_ENUM_FMT, layer id = %d\n",
				layer->device_id);
	if (fmt->index > 1) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid format index\n");
		return -EINVAL;
	}

	/* Fill in the information about format */
	index = fmt->index;
	memset(fmt, 0, sizeof(*fmt));
	fmt->index = index;
	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
	if (index == 0) {
		strcpy(fmt->description, "YUV 4:2:2 - UYVY");
		fmt->pixelformat = V4L2_PIX_FMT_UYVY;
	} else {
		strcpy(fmt->description, "Y/CbCr 4:2:0");
		fmt->pixelformat = V4L2_PIX_FMT_NV12;
	}

	return 0;
}

static int vpbe_display_s_fmt(struct file *file, void *priv,
				struct v4l2_format *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
	struct osd_state *osd_device = disp_dev->osd_device;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_S_FMT, layer id = %d\n",
			layer->device_id);

	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}
	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != fmt->type) {
		v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "invalid type\n");
		return -EINVAL;
	}
	/* Check for valid pixel format */
	ret = vpbe_try_format(disp_dev, pixfmt, 1);
	if (ret)
		return ret;

	/* YUV420 is requested, check availability of the
	other video window */

	layer->pix_fmt = *pixfmt;

	/* Get osd layer config */
	osd_device->ops.get_layer_config(osd_device,
			layer->layer_info.id, cfg);
	/* Store the pixel format in the layer object */
	cfg->xsize = pixfmt->width;
	cfg->ysize = pixfmt->height;
	cfg->line_length = pixfmt->bytesperline;
	cfg->ypos = 0;
	cfg->xpos = 0;
	cfg->interlaced = vpbe_dev->current_timings.interlaced;

	if (V4L2_PIX_FMT_UYVY == pixfmt->pixelformat)
		cfg->pixfmt = PIXFMT_YCbCrI;

	/* Change of the default pixel format for both video windows */
	if (V4L2_PIX_FMT_NV12 == pixfmt->pixelformat) {
		struct vpbe_layer *otherlayer;
		cfg->pixfmt = PIXFMT_NV12;
		otherlayer = _vpbe_display_get_other_win_layer(disp_dev,
								layer);
		otherlayer->layer_info.config.pixfmt = PIXFMT_NV12;
	}

	/* Set the layer config in the osd window */
	ret = osd_device->ops.set_layer_config(osd_device,
				layer->layer_info.id, cfg);
	if (ret < 0) {
		v4l2_err(&vpbe_dev->v4l2_dev,
				"Error in S_FMT params:\n");
		return -EINVAL;
	}

	/* Readback and fill the local copy of current pix format */
	osd_device->ops.get_layer_config(osd_device,
			layer->layer_info.id, cfg);

	return 0;
}

static int vpbe_display_try_fmt(struct file *file, void *priv,
				  struct v4l2_format *fmt)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_TRY_FMT\n");

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != fmt->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "invalid type\n");
		return -EINVAL;
	}

	/* Check for valid field format */
	return  vpbe_try_format(disp_dev, pixfmt, 0);

}

/**
 * vpbe_display_s_std - Set the given standard in the encoder
 *
 * Sets the standard if supported by the current encoder. Return the status.
 * 0 - success & -EINVAL on error
 */
static int vpbe_display_s_std(struct file *file, void *priv,
				v4l2_std_id *std_id)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_S_STD\n");

	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}
	if (NULL != vpbe_dev->ops.s_std) {
		ret = vpbe_dev->ops.s_std(vpbe_dev, std_id);
		if (ret) {
			v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to set standard for sub devices\n");
			return -EINVAL;
		}
	} else {
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_g_std - Get the standard in the current encoder
 *
 * Get the standard in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int vpbe_display_g_std(struct file *file, void *priv,
				v4l2_std_id *std_id)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_G_STD\n");

	/* Get the standard from the current encoder */
	if (vpbe_dev->current_timings.timings_type & VPBE_ENC_STD) {
		*std_id = vpbe_dev->current_timings.timings.std_id;
		return 0;
	}

	return -EINVAL;
}

/**
 * vpbe_display_enum_output - enumerate outputs
 *
 * Enumerates the outputs available at the vpbe display
 * returns the status, -EINVAL if end of output list
 */
static int vpbe_display_enum_output(struct file *file, void *priv,
				    struct v4l2_output *output)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_ENUM_OUTPUT\n");

	/* Enumerate outputs */

	if (NULL == vpbe_dev->ops.enum_outputs)
		return -EINVAL;

	ret = vpbe_dev->ops.enum_outputs(vpbe_dev, output);
	if (ret) {
		v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"Failed to enumerate outputs\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_s_output - Set output to
 * the output specified by the index
 */
static int vpbe_display_s_output(struct file *file, void *priv,
				unsigned int i)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_S_OUTPUT\n");
	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}
	if (NULL == vpbe_dev->ops.set_output)
		return -EINVAL;

	ret = vpbe_dev->ops.set_output(vpbe_dev, i);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to set output for sub devices\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_g_output - Get output from subdevice
 * for a given by the index
 */
static int vpbe_display_g_output(struct file *file, void *priv,
				unsigned int *i)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_G_OUTPUT\n");
	/* Get the standard from the current encoder */
	*i = vpbe_dev->current_out_index;

	return 0;
}

/**
 * vpbe_display_enum_dv_presets - Enumerate the dv presets
 *
 * enum the preset in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int
vpbe_display_enum_dv_presets(struct file *file, void *priv,
			struct v4l2_dv_enum_preset *preset)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_ENUM_DV_PRESETS\n");

	/* Enumerate outputs */
	if (NULL == vpbe_dev->ops.enum_dv_presets)
		return -EINVAL;

	ret = vpbe_dev->ops.enum_dv_presets(vpbe_dev, preset);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to enumerate dv presets info\n");
		return -EINVAL;
	}

	return 0;
}

/**
 * vpbe_display_s_dv_preset - Set the dv presets
 *
 * Set the preset in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int
vpbe_display_s_dv_preset(struct file *file, void *priv,
				struct v4l2_dv_preset *preset)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_S_DV_PRESETS\n");


	/* If streaming is started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Streaming is started\n");
		return -EBUSY;
	}

	/* Set the given standard in the encoder */
	if (NULL != vpbe_dev->ops.s_dv_preset)
		return -EINVAL;

	ret = vpbe_dev->ops.s_dv_preset(vpbe_dev, preset);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"Failed to set the dv presets info\n");
		return -EINVAL;
	}
	/* set the current norm to zero to be consistent. If STD is used
	 * v4l2 layer will set the norm properly on successful s_std call
	 */
	layer->video_dev.current_norm = 0;

	return 0;
}

/**
 * vpbe_display_g_dv_preset - Set the dv presets
 *
 * Get the preset in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int
vpbe_display_g_dv_preset(struct file *file, void *priv,
				struct v4l2_dv_preset *dv_preset)
{
	struct vpbe_fh *fh = priv;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_G_DV_PRESETS\n");

	/* Get the given standard in the encoder */

	if (vpbe_dev->current_timings.timings_type &
				VPBE_ENC_DV_PRESET) {
		dv_preset->preset =
			vpbe_dev->current_timings.timings.dv_preset;
	} else {
		return -EINVAL;
	}

	return 0;
}

static int vpbe_display_streamoff(struct file *file, void *priv,
				enum v4l2_buf_type buf_type)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct osd_state *osd_device = fh->disp_dev->osd_device;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"VIDIOC_STREAMOFF,layer id = %d\n",
			layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf_type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If io is allowed for this file handle, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}

	/* If streaming is not started, return error */
	if (!layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "streaming not started in layer"
			" id = %d\n", layer->device_id);
		return -EINVAL;
	}

	osd_device->ops.disable_layer(osd_device,
			layer->layer_info.id);
	layer->started = 0;
	ret = videobuf_streamoff(&layer->buffer_queue);

	return ret;
}

static int vpbe_display_streamon(struct file *file, void *priv,
			 enum v4l2_buf_type buf_type)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	struct osd_state *osd_device = disp_dev->osd_device;
	int ret;

	osd_device->ops.disable_layer(osd_device,
			layer->layer_info.id);

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_STREAMON, layerid=%d\n",
						layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf_type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If file handle is not allowed IO, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}
	/* If Streaming is already started, return error */
	if (layer->started) {
		v4l2_err(&vpbe_dev->v4l2_dev, "layer is already streaming\n");
		return -EBUSY;
	}

	/*
	 * Call videobuf_streamon to start streaming
	 * in videobuf
	 */
	ret = videobuf_streamon(&layer->buffer_queue);
	if (ret) {
		v4l2_err(&vpbe_dev->v4l2_dev,
		"error in videobuf_streamon\n");
		return ret;
	}
	/* If buffer queue is empty, return error */
	if (list_empty(&layer->dma_queue)) {
		v4l2_err(&vpbe_dev->v4l2_dev, "buffer queue is empty\n");
		goto streamoff;
	}
	/* Get the next frame from the buffer queue */
	layer->next_frm = layer->cur_frm = list_entry(layer->dma_queue.next,
				struct videobuf_buffer, queue);
	/* Remove buffer from the buffer queue */
	list_del(&layer->cur_frm->queue);
	/* Mark state of the current frame to active */
	layer->cur_frm->state = VIDEOBUF_ACTIVE;
	/* Initialize field_id and started member */
	layer->field_id = 0;

	/* Set parameters in OSD and VENC */
	ret = vpbe_set_osd_display_params(disp_dev, layer);
	if (ret < 0)
		goto streamoff;

	/*
	 * if request format is yuv420 semiplanar, need to
	 * enable both video windows
	 */
	layer->started = 1;

	layer->layer_first_int = 1;

	return ret;
streamoff:
	ret = videobuf_streamoff(&layer->buffer_queue);
	return ret;
}

static int vpbe_display_dqbuf(struct file *file, void *priv,
		      struct v4l2_buffer *buf)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_DQBUF, layer id = %d\n",
		layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}
	/* If this file handle is not allowed to do IO, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}
	if (file->f_flags & O_NONBLOCK)
		/* Call videobuf_dqbuf for non blocking mode */
		ret = videobuf_dqbuf(&layer->buffer_queue, buf, 1);
	else
		/* Call videobuf_dqbuf for blocking mode */
		ret = videobuf_dqbuf(&layer->buffer_queue, buf, 0);

	return ret;
}

static int vpbe_display_qbuf(struct file *file, void *priv,
		     struct v4l2_buffer *p)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_QBUF, layer id = %d\n",
		layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != p->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If this file handle is not allowed to do IO, return error */
	if (!fh->io_allowed) {
		v4l2_err(&vpbe_dev->v4l2_dev, "No io_allowed\n");
		return -EACCES;
	}

	return videobuf_qbuf(&layer->buffer_queue, p);
}

static int vpbe_display_querybuf(struct file *file, void *priv,
			 struct v4l2_buffer *buf)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
		"VIDIOC_QUERYBUF, layer id = %d\n",
		layer->device_id);

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != buf->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* Call videobuf_querybuf to get information */
	ret = videobuf_querybuf(&layer->buffer_queue, buf);

	return ret;
}

static int vpbe_display_reqbufs(struct file *file, void *priv,
			struct v4l2_requestbuffers *req_buf)
{
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	int ret;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_reqbufs\n");

	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != req_buf->type) {
		v4l2_err(&vpbe_dev->v4l2_dev, "Invalid buffer type\n");
		return -EINVAL;
	}

	/* If io users of the layer is not zero, return error */
	if (0 != layer->io_usrs) {
		v4l2_err(&vpbe_dev->v4l2_dev, "not IO user\n");
		return -EBUSY;
	}
	/* Initialize videobuf queue as per the buffer type */
	videobuf_queue_dma_contig_init(&layer->buffer_queue,
				&video_qops,
				vpbe_dev->pdev,
				&layer->irqlock,
				V4L2_BUF_TYPE_VIDEO_OUTPUT,
				layer->pix_fmt.field,
				sizeof(struct videobuf_buffer),
				fh, NULL);

	/* Set io allowed member of file handle to TRUE */
	fh->io_allowed = 1;
	/* Increment io usrs member of layer object to 1 */
	layer->io_usrs = 1;
	/* Store type of memory requested in layer object */
	layer->memory = req_buf->memory;
	/* Initialize buffer queue */
	INIT_LIST_HEAD(&layer->dma_queue);
	/* Allocate buffers */
	ret = videobuf_reqbufs(&layer->buffer_queue, req_buf);

	return ret;
}

/*
 * vpbe_display_mmap()
 * It is used to map kernel space buffers into user spaces
 */
static int vpbe_display_mmap(struct file *filep, struct vm_area_struct *vma)
{
	/* Get the layer object and file handle object */
	struct vpbe_fh *fh = filep->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_mmap\n");

	return videobuf_mmap_mapper(&layer->buffer_queue, vma);
}

/* vpbe_display_poll(): It is used for select/poll system call
 */
static unsigned int vpbe_display_poll(struct file *filep, poll_table *wait)
{
	struct vpbe_fh *fh = filep->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct vpbe_device *vpbe_dev = fh->disp_dev->vpbe_dev;
	unsigned int err = 0;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_poll\n");
	if (layer->started)
		err = videobuf_poll_stream(filep, &layer->buffer_queue, wait);
	return err;
}

/*
 * vpbe_display_open()
 * It creates object of file handle structure and stores it in private_data
 * member of filepointer
 */
static int vpbe_display_open(struct file *file)
{
	struct vpbe_fh *fh = NULL;
	struct vpbe_layer *layer = video_drvdata(file);
	struct vpbe_display *disp_dev = layer->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_state *osd_device = disp_dev->osd_device;
	int err;

	/* Allocate memory for the file handle object */
	fh = kmalloc(sizeof(struct vpbe_fh), GFP_KERNEL);
	if (fh == NULL) {
		v4l2_err(&vpbe_dev->v4l2_dev,
			"unable to allocate memory for file handle object\n");
		return -ENOMEM;
	}
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe display open plane = %d\n",
			layer->device_id);

	/* store pointer to fh in private_data member of filep */
	file->private_data = fh;
	fh->layer = layer;
	fh->disp_dev = disp_dev;

	if (!layer->usrs) {

		/* First claim the layer for this device */
		err = osd_device->ops.request_layer(osd_device,
						layer->layer_info.id);
		if (err < 0) {
			/* Couldn't get layer */
			v4l2_err(&vpbe_dev->v4l2_dev,
				"Display Manager failed to allocate layer\n");
			kfree(fh);
			return -EINVAL;
		}
	}
	/* Increment layer usrs counter */
	layer->usrs++;
	/* Set io_allowed member to false */
	fh->io_allowed = 0;
	/* Initialize priority of this instance to default priority */
	fh->prio = V4L2_PRIORITY_UNSET;
	v4l2_prio_open(&layer->prio, &fh->prio);
	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
			"vpbe display device opened successfully\n");
	return 0;
}

/*
 * vpbe_display_release()
 * This function deletes buffer queue, frees the buffers and the davinci
 * display file * handle
 */
static int vpbe_display_release(struct file *file)
{
	/* Get the layer object and file handle object */
	struct vpbe_fh *fh = file->private_data;
	struct vpbe_layer *layer = fh->layer;
	struct osd_layer_config *cfg  = &layer->layer_info.config;
	struct vpbe_display *disp_dev = fh->disp_dev;
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct osd_state *osd_device = disp_dev->osd_device;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_release\n");

	/* if this instance is doing IO */
	if (fh->io_allowed) {
		/* Reset io_usrs member of layer object */
		layer->io_usrs = 0;

		osd_device->ops.disable_layer(osd_device,
				layer->layer_info.id);
		layer->started = 0;
		/* Free buffers allocated */
		videobuf_queue_cancel(&layer->buffer_queue);
		videobuf_mmap_free(&layer->buffer_queue);
	}

	/* Decrement layer usrs counter */
	layer->usrs--;
	/* If this file handle has initialize encoder device, reset it */
	if (!layer->usrs) {
		if (cfg->pixfmt == PIXFMT_NV12) {
			struct vpbe_layer *otherlayer;
			otherlayer =
			_vpbe_display_get_other_win_layer(disp_dev, layer);
			osd_device->ops.disable_layer(osd_device,
					otherlayer->layer_info.id);
			osd_device->ops.release_layer(osd_device,
					otherlayer->layer_info.id);
		}
		osd_device->ops.disable_layer(osd_device,
				layer->layer_info.id);
		osd_device->ops.release_layer(osd_device,
				layer->layer_info.id);
	}
	/* Close the priority */
	v4l2_prio_close(&layer->prio, fh->prio);
	file->private_data = NULL;

	/* Free memory allocated to file handle object */
	kfree(fh);

	disp_dev->cbcr_ofst = 0;

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vpbe_display_g_register(struct file *file, void *priv,
			struct v4l2_dbg_register *reg)
{
	struct v4l2_dbg_match *match = &reg->match;

	if (match->type >= 2) {
		v4l2_subdev_call(vpbe_dev->venc,
				 core,
				 g_register,
				 reg);
	}

	return 0;
}

static int vpbe_display_s_register(struct file *file, void *priv,
			struct v4l2_dbg_register *reg)
{
	return 0;
}
#endif

/* vpbe capture ioctl operations */
static const struct v4l2_ioctl_ops vpbe_ioctl_ops = {
	.vidioc_querycap	 = vpbe_display_querycap,
	.vidioc_g_fmt_vid_out    = vpbe_display_g_fmt,
	.vidioc_enum_fmt_vid_out = vpbe_display_enum_fmt,
	.vidioc_s_fmt_vid_out    = vpbe_display_s_fmt,
	.vidioc_try_fmt_vid_out  = vpbe_display_try_fmt,
	.vidioc_reqbufs		 = vpbe_display_reqbufs,
	.vidioc_querybuf	 = vpbe_display_querybuf,
	.vidioc_qbuf		 = vpbe_display_qbuf,
	.vidioc_dqbuf		 = vpbe_display_dqbuf,
	.vidioc_streamon	 = vpbe_display_streamon,
	.vidioc_streamoff	 = vpbe_display_streamoff,
	.vidioc_cropcap		 = vpbe_display_cropcap,
	.vidioc_g_crop		 = vpbe_display_g_crop,
	.vidioc_s_crop		 = vpbe_display_s_crop,
	.vidioc_g_priority	 = vpbe_display_g_priority,
	.vidioc_s_priority	 = vpbe_display_s_priority,
	.vidioc_s_std		 = vpbe_display_s_std,
	.vidioc_g_std		 = vpbe_display_g_std,
	.vidioc_enum_output	 = vpbe_display_enum_output,
	.vidioc_s_output	 = vpbe_display_s_output,
	.vidioc_g_output	 = vpbe_display_g_output,
	.vidioc_s_dv_preset	 = vpbe_display_s_dv_preset,
	.vidioc_g_dv_preset	 = vpbe_display_g_dv_preset,
	.vidioc_enum_dv_presets	 = vpbe_display_enum_dv_presets,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register	 = vpbe_display_g_register,
	.vidioc_s_register	 = vpbe_display_s_register,
#endif
};

static struct v4l2_file_operations vpbe_fops = {
	.owner = THIS_MODULE,
	.open = vpbe_display_open,
	.release = vpbe_display_release,
	.unlocked_ioctl = video_ioctl2,
	.mmap = vpbe_display_mmap,
	.poll = vpbe_display_poll
};

static int vpbe_device_get(struct device *dev, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct vpbe_display *vpbe_disp  = data;

	if (strcmp("vpbe_controller", pdev->name) == 0)
		vpbe_disp->vpbe_dev = platform_get_drvdata(pdev);

	if (strcmp("vpbe-osd", pdev->name) == 0)
		vpbe_disp->osd_device = platform_get_drvdata(pdev);

	return 0;
}

static __devinit int init_vpbe_layer(int i, struct vpbe_display *disp_dev,
				     struct platform_device *pdev)
{
	struct vpbe_layer *vpbe_display_layer = NULL;
	struct video_device *vbd = NULL;

	/* Allocate memory for four plane display objects */

	disp_dev->dev[i] =
		kzalloc(sizeof(struct vpbe_layer), GFP_KERNEL);

	/* If memory allocation fails, return error */
	if (!disp_dev->dev[i]) {
		printk(KERN_ERR "ran out of memory\n");
		return  -ENOMEM;
	}
	spin_lock_init(&disp_dev->dev[i]->irqlock);
	mutex_init(&disp_dev->dev[i]->opslock);

	/* Get the pointer to the layer object */
	vpbe_display_layer = disp_dev->dev[i];
	vbd = &vpbe_display_layer->video_dev;
	/* Initialize field of video device */
	vbd->release	= video_device_release_empty;
	vbd->fops	= &vpbe_fops;
	vbd->ioctl_ops	= &vpbe_ioctl_ops;
	vbd->minor	= -1;
	vbd->v4l2_dev   = &disp_dev->vpbe_dev->v4l2_dev;
	vbd->lock	= &vpbe_display_layer->opslock;

	if (disp_dev->vpbe_dev->current_timings.timings_type &
			VPBE_ENC_STD) {
		vbd->tvnorms = (V4L2_STD_525_60 | V4L2_STD_625_50);
		vbd->current_norm =
			disp_dev->vpbe_dev->
			current_timings.timings.std_id;
	} else
		vbd->current_norm = 0;

	snprintf(vbd->name, sizeof(vbd->name),
			"DaVinci_VPBE Display_DRIVER_V%d.%d.%d",
			(VPBE_DISPLAY_VERSION_CODE >> 16) & 0xff,
			(VPBE_DISPLAY_VERSION_CODE >> 8) & 0xff,
			(VPBE_DISPLAY_VERSION_CODE) & 0xff);

	vpbe_display_layer->device_id = i;

	vpbe_display_layer->layer_info.id =
		((i == VPBE_DISPLAY_DEVICE_0) ? WIN_VID0 : WIN_VID1);

	/* Initialize prio member of layer object */
	v4l2_prio_init(&vpbe_display_layer->prio);

	return 0;
}

static __devinit int register_device(struct vpbe_layer *vpbe_display_layer,
					struct vpbe_display *disp_dev,
					struct platform_device *pdev) {
	int err;

	v4l2_info(&disp_dev->vpbe_dev->v4l2_dev,
		  "Trying to register VPBE display device.\n");
	v4l2_info(&disp_dev->vpbe_dev->v4l2_dev,
		  "layer=%x,layer->video_dev=%x\n",
		  (int)vpbe_display_layer,
		  (int)&vpbe_display_layer->video_dev);

	err = video_register_device(&vpbe_display_layer->video_dev,
				    VFL_TYPE_GRABBER,
				    -1);
	if (err)
		return -ENODEV;

	vpbe_display_layer->disp_dev = disp_dev;
	/* set the driver data in platform device */
	platform_set_drvdata(pdev, disp_dev);
	video_set_drvdata(&vpbe_display_layer->video_dev,
			  vpbe_display_layer);

	return 0;
}



/*
 * vpbe_display_probe()
 * This function creates device entries by register itself to the V4L2 driver
 * and initializes fields of each layer objects
 */
static __devinit int vpbe_display_probe(struct platform_device *pdev)
{
	struct vpbe_layer *vpbe_display_layer;
	struct vpbe_display *disp_dev;
	struct resource *res = NULL;
	int k;
	int i;
	int err;
	int irq;

	printk(KERN_DEBUG "vpbe_display_probe\n");
	/* Allocate memory for vpbe_display */
	disp_dev = kzalloc(sizeof(struct vpbe_display), GFP_KERNEL);
	if (!disp_dev) {
		printk(KERN_ERR "ran out of memory\n");
		return -ENOMEM;
	}

	spin_lock_init(&disp_dev->dma_queue_lock);
	/*
	 * Scan all the platform devices to find the vpbe
	 * controller device and get the vpbe_dev object
	 */
	err = bus_for_each_dev(&platform_bus_type, NULL, disp_dev,
			vpbe_device_get);
	if (err < 0)
		return err;
	/* Initialize the vpbe display controller */
	if (NULL != disp_dev->vpbe_dev->ops.initialize) {
		err = disp_dev->vpbe_dev->ops.initialize(&pdev->dev,
							 disp_dev->vpbe_dev);
		if (err) {
			v4l2_err(&disp_dev->vpbe_dev->v4l2_dev,
					"Error initing vpbe\n");
			err = -ENOMEM;
			goto probe_out;
		}
	}

	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		if (init_vpbe_layer(i, disp_dev, pdev)) {
			err = -ENODEV;
			goto probe_out;
		}
	}

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		v4l2_err(&disp_dev->vpbe_dev->v4l2_dev,
			 "Unable to get VENC interrupt resource\n");
		err = -ENODEV;
		goto probe_out;
	}

	irq = res->start;
	if (request_irq(irq, venc_isr,  IRQF_DISABLED, VPBE_DISPLAY_DRIVER,
		disp_dev)) {
		v4l2_err(&disp_dev->vpbe_dev->v4l2_dev,
				"Unable to request interrupt\n");
		err = -ENODEV;
		goto probe_out;
	}

	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		if (register_device(disp_dev->dev[i], disp_dev, pdev)) {
			err = -ENODEV;
			goto probe_out_irq;
		}
	}

	printk(KERN_DEBUG "Successfully completed the probing of vpbe v4l2 device\n");
	return 0;

probe_out_irq:
	free_irq(res->start, disp_dev);
probe_out:
	for (k = 0; k < VPBE_DISPLAY_MAX_DEVICES; k++) {
		/* Get the pointer to the layer object */
		vpbe_display_layer = disp_dev->dev[k];
		/* Unregister video device */
		if (vpbe_display_layer) {
			video_unregister_device(
				&vpbe_display_layer->video_dev);
				kfree(disp_dev->dev[k]);
		}
	}
	kfree(disp_dev);
	return err;
}

/*
 * vpbe_display_remove()
 * It un-register hardware layer from V4L2 driver
 */
static int vpbe_display_remove(struct platform_device *pdev)
{
	struct vpbe_layer *vpbe_display_layer;
	struct vpbe_display *disp_dev = platform_get_drvdata(pdev);
	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
	struct resource *res;
	int i;

	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_remove\n");

	/* unregister irq */
	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	free_irq(res->start, disp_dev);

	/* deinitialize the vpbe display controller */
	if (NULL != vpbe_dev->ops.deinitialize)
		vpbe_dev->ops.deinitialize(&pdev->dev, vpbe_dev);
	/* un-register device */
	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		/* Get the pointer to the layer object */
		vpbe_display_layer = disp_dev->dev[i];
		/* Unregister video device */
		video_unregister_device(&vpbe_display_layer->video_dev);

	}
	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
		kfree(disp_dev->dev[i]);
		disp_dev->dev[i] = NULL;
	}

	return 0;
}

static struct platform_driver vpbe_display_driver = {
	.driver = {
		.name = VPBE_DISPLAY_DRIVER,
		.owner = THIS_MODULE,
		.bus = &platform_bus_type,
	},
	.probe = vpbe_display_probe,
	.remove = __devexit_p(vpbe_display_remove),
};

module_platform_driver(vpbe_display_driver);

MODULE_DESCRIPTION("TI DM644x/DM355/DM365 VPBE Display controller");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments");