text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com/
   */
  #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 <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 vpbe_set_osd_display_params(struct vpbe_display *disp_dev,
  			struct vpbe_layer *layer);
  
  static int venc_is_second_field(struct vpbe_display *disp_dev)
  {
  	struct vpbe_device *vpbe_dev = disp_dev->vpbe_dev;
  	int ret, 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 1;
  	}
  	return val;
  }
  
  static void vpbe_isr_even_field(struct vpbe_display *disp_obj,
  				struct vpbe_layer *layer)
  {
  	if (layer->cur_frm == layer->next_frm)
  		return;
  
  	layer->cur_frm->vb.vb2_buf.timestamp = ktime_get_ns();
  	vb2_buffer_done(&layer->cur_frm->vb.vb2_buf, VB2_BUF_STATE_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  vpbe_disp_buffer, list);
  	/* Remove that from the buffer queue */
  	list_del(&layer->next_frm->list);
  	spin_unlock(&disp_obj->dma_queue_lock);
  	/* Mark state of the frame to active */
  	layer->next_frm->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
  	addr = vb2_dma_contig_plane_dma_addr(&layer->next_frm->vb.vb2_buf, 0);
  	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 (!arg || !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 (!vb2_start_streaming_called(&layer->buffer_queue))
  			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 vb2_qbuf() function
   * the buffer is prepared and user space virtual address is converted into
   * physical address
   */
  static int vpbe_buffer_prepare(struct vb2_buffer *vb)
  {
  	struct vb2_queue *q = vb->vb2_queue;
  	struct vpbe_layer *layer = vb2_get_drv_priv(q);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	unsigned long addr;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
  				"vpbe_buffer_prepare\n");
  
  	vb2_set_plane_payload(vb, 0, layer->pix_fmt.sizeimage);
  	if (vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
  		return -EINVAL;
  
  	addr = vb2_dma_contig_plane_dma_addr(vb, 0);
  	if (!IS_ALIGNED(addr, 8)) {
  		v4l2_err(&vpbe_dev->v4l2_dev,
  			 "buffer_prepare:offset is not aligned to 32 bytes\n");
  		return -EINVAL;
  	}
  	return 0;
  }
  
  /*
   * vpbe_buffer_setup()
   * This function allocates memory for the buffers
   */
  static int
  vpbe_buffer_queue_setup(struct vb2_queue *vq,
  			unsigned int *nbuffers, unsigned int *nplanes,
  			unsigned int sizes[], struct device *alloc_devs[])
  
  {
  	/* Get the file handle object and layer object */
  	struct vpbe_layer *layer = vb2_get_drv_priv(vq);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_buffer_setup\n");
  
  	/* Store number of buffers allocated in numbuffer member */
  	if (vq->num_buffers + *nbuffers < VPBE_DEFAULT_NUM_BUFS)
  		*nbuffers = VPBE_DEFAULT_NUM_BUFS - vq->num_buffers;
  
  	if (*nplanes)
  		return sizes[0] < layer->pix_fmt.sizeimage ? -EINVAL : 0;
  
  	*nplanes = 1;
  	sizes[0] = layer->pix_fmt.sizeimage;
  
  	return 0;
  }
  
  /*
   * vpbe_buffer_queue()
   * This function adds the buffer to DMA queue
   */
  static void vpbe_buffer_queue(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	/* Get the file handle object and layer object */
  	struct vpbe_disp_buffer *buf = container_of(vbuf,
  				struct vpbe_disp_buffer, vb);
  	struct vpbe_layer *layer = vb2_get_drv_priv(vb->vb2_queue);
  	struct vpbe_display *disp = layer->disp_dev;
  	struct vpbe_device *vpbe_dev = layer->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(&buf->list, &layer->dma_queue);
  	spin_unlock_irqrestore(&disp->dma_queue_lock, flags);
  }
  
  static int vpbe_start_streaming(struct vb2_queue *vq, unsigned int count)
  {
  	struct vpbe_layer *layer = vb2_get_drv_priv(vq);
  	struct osd_state *osd_device = layer->disp_dev->osd_device;
  	int ret;
  
  	osd_device->ops.disable_layer(osd_device, layer->layer_info.id);
  
  	/* Get the next frame from the buffer queue */
  	layer->next_frm = layer->cur_frm = list_entry(layer->dma_queue.next,
  				struct vpbe_disp_buffer, list);
  	/* Remove buffer from the buffer queue */
  	list_del(&layer->cur_frm->list);
  	/* Mark state of the current frame to active */
  	layer->cur_frm->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
  	/* Initialize field_id and started member */
  	layer->field_id = 0;
  
  	/* Set parameters in OSD and VENC */
  	ret = vpbe_set_osd_display_params(layer->disp_dev, layer);
  	if (ret < 0) {
  		struct vpbe_disp_buffer *buf, *tmp;
  
  		vb2_buffer_done(&layer->cur_frm->vb.vb2_buf,
  				VB2_BUF_STATE_QUEUED);
  		list_for_each_entry_safe(buf, tmp, &layer->dma_queue, list) {
  			list_del(&buf->list);
  			vb2_buffer_done(&buf->vb.vb2_buf,
  					VB2_BUF_STATE_QUEUED);
  		}
  
  		return ret;
  	}
  
  	/*
  	 * if request format is yuv420 semiplanar, need to
  	 * enable both video windows
  	 */
  	layer->layer_first_int = 1;
  
  	return ret;
  }
  
  static void vpbe_stop_streaming(struct vb2_queue *vq)
  {
  	struct vpbe_layer *layer = vb2_get_drv_priv(vq);
  	struct osd_state *osd_device = layer->disp_dev->osd_device;
  	struct vpbe_display *disp = layer->disp_dev;
  	unsigned long flags;
  
  	if (!vb2_is_streaming(vq))
  		return;
  
  	osd_device->ops.disable_layer(osd_device, layer->layer_info.id);
  
  	/* release all active buffers */
  	spin_lock_irqsave(&disp->dma_queue_lock, flags);
  	if (layer->cur_frm == layer->next_frm) {
  		vb2_buffer_done(&layer->cur_frm->vb.vb2_buf,
  				VB2_BUF_STATE_ERROR);
  	} else {
  		if (layer->cur_frm)
  			vb2_buffer_done(&layer->cur_frm->vb.vb2_buf,
  					VB2_BUF_STATE_ERROR);
  		if (layer->next_frm)
  			vb2_buffer_done(&layer->next_frm->vb.vb2_buf,
  					VB2_BUF_STATE_ERROR);
  	}
  
  	while (!list_empty(&layer->dma_queue)) {
  		layer->next_frm = list_entry(layer->dma_queue.next,
  						struct vpbe_disp_buffer, list);
  		list_del(&layer->next_frm->list);
  		vb2_buffer_done(&layer->next_frm->vb.vb2_buf,
  				VB2_BUF_STATE_ERROR);
  	}
  	spin_unlock_irqrestore(&disp->dma_queue_lock, flags);
  }
  
  static const struct vb2_ops video_qops = {
  	.queue_setup = vpbe_buffer_queue_setup,
  	.wait_prepare = vb2_ops_wait_prepare,
  	.wait_finish = vb2_ops_wait_finish,
  	.buf_prepare = vpbe_buffer_prepare,
  	.start_streaming = vpbe_start_streaming,
  	.stop_streaming = vpbe_stop_streaming,
  	.buf_queue = vpbe_buffer_queue,
  };
  
  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 = vb2_dma_contig_plane_dma_addr(&layer->cur_frm->vb.vb2_buf, 0);
  	/* 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.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_SELECTION 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->v_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_querycap(struct file *file, void  *priv,
  			       struct v4l2_capability *cap)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  
  	snprintf(cap->driver, sizeof(cap->driver), "%s",
  		dev_name(vpbe_dev->pdev));
  	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
  		 dev_name(vpbe_dev->pdev));
  	strscpy(cap->card, vpbe_dev->cfg->module_name, sizeof(cap->card));
  
  	return 0;
  }
  
  static int vpbe_display_s_selection(struct file *file, void *priv,
  			     struct v4l2_selection *sel)
  {
  	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_layer_config *cfg = &layer->layer_info.config;
  	struct osd_state *osd_device = disp_dev->osd_device;
  	struct v4l2_rect rect = sel->r;
  	int ret;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
  		"VIDIOC_S_SELECTION, layer id = %d\n", layer->device_id);
  
  	if (sel->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
  	    sel->target != V4L2_SEL_TGT_CROP)
  		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);
  
  	sel->r = rect;
  	return 0;
  }
  
  static int vpbe_display_g_selection(struct file *file, void *priv,
  				    struct v4l2_selection *sel)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct osd_layer_config *cfg = &layer->layer_info.config;
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	struct osd_state *osd_device = layer->disp_dev->osd_device;
  	struct v4l2_rect *rect = &sel->r;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,
  			"VIDIOC_G_SELECTION, layer id = %d\n",
  			layer->device_id);
  
  	if (sel->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
  		return -EINVAL;
  
  	switch (sel->target) {
  	case V4L2_SEL_TGT_CROP:
  		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;
  		break;
  	case V4L2_SEL_TGT_CROP_DEFAULT:
  	case V4L2_SEL_TGT_CROP_BOUNDS:
  		rect->left = 0;
  		rect->top = 0;
  		rect->width = vpbe_dev->current_timings.xres;
  		rect->height = vpbe_dev->current_timings.yres;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int vpbe_display_g_pixelaspect(struct file *file, void *priv,
  				      int type, struct v4l2_fract *f)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_CROPCAP ioctl\n");
  
  	if (type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
  		return -EINVAL;
  
  	*f = vpbe_dev->current_timings.aspect;
  	return 0;
  }
  
  static int vpbe_display_g_fmt(struct file *file, void *priv,
  				struct v4l2_format *fmt)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->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_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  
  	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 */
  	if (fmt->index == 0)
  		fmt->pixelformat = V4L2_PIX_FMT_UYVY;
  	else
  		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_layer *layer = video_drvdata(file);
  	struct vpbe_display *disp_dev = layer->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 (vb2_is_busy(&layer->buffer_queue))
  		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;
  	if (pixfmt->pixelformat == V4L2_PIX_FMT_NV12) {
  		struct vpbe_layer *otherlayer;
  
  		otherlayer = _vpbe_display_get_other_win_layer(disp_dev, layer);
  		/* if other layer is available, only
  		 * claim it, do not configure it
  		 */
  		ret = osd_device->ops.request_layer(osd_device,
  						    otherlayer->layer_info.id);
  		if (ret < 0) {
  			v4l2_err(&vpbe_dev->v4l2_dev,
  				 "Display Manager failed to allocate layer\n");
  			return -EBUSY;
  		}
  	}
  
  	/* 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_layer *layer = video_drvdata(file);
  	struct vpbe_display *disp_dev = layer->disp_dev;
  	struct vpbe_device *vpbe_dev = layer->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_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	int ret;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_S_STD\n");
  
  	if (vb2_is_busy(&layer->buffer_queue))
  		return -EBUSY;
  
  	if (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_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->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.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_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	int ret;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_ENUM_OUTPUT\n");
  
  	/* Enumerate outputs */
  	if (!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_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	int ret;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev,	"VIDIOC_S_OUTPUT\n");
  
  	if (vb2_is_busy(&layer->buffer_queue))
  		return -EBUSY;
  
  	if (!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_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->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_timings - Enumerate the dv timings
   *
   * enum the timings in the current encoder. Return the status. 0 - success
   * -EINVAL on error
   */
  static int
  vpbe_display_enum_dv_timings(struct file *file, void *priv,
  			struct v4l2_enum_dv_timings *timings)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	int ret;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_ENUM_DV_TIMINGS\n");
  
  	/* Enumerate outputs */
  	if (!vpbe_dev->ops.enum_dv_timings)
  		return -EINVAL;
  
  	ret = vpbe_dev->ops.enum_dv_timings(vpbe_dev, timings);
  	if (ret) {
  		v4l2_err(&vpbe_dev->v4l2_dev,
  			"Failed to enumerate dv timings info\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /*
   * vpbe_display_s_dv_timings - Set the dv timings
   *
   * Set the timings in the current encoder. Return the status. 0 - success
   * -EINVAL on error
   */
  static int
  vpbe_display_s_dv_timings(struct file *file, void *priv,
  				struct v4l2_dv_timings *timings)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  	int ret;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_S_DV_TIMINGS\n");
  
  	if (vb2_is_busy(&layer->buffer_queue))
  		return -EBUSY;
  
  	/* Set the given standard in the encoder */
  	if (!vpbe_dev->ops.s_dv_timings)
  		return -EINVAL;
  
  	ret = vpbe_dev->ops.s_dv_timings(vpbe_dev, timings);
  	if (ret) {
  		v4l2_err(&vpbe_dev->v4l2_dev,
  			"Failed to set the dv timings info\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /*
   * vpbe_display_g_dv_timings - Set the dv timings
   *
   * Get the timings in the current encoder. Return the status. 0 - success
   * -EINVAL on error
   */
  static int
  vpbe_display_g_dv_timings(struct file *file, void *priv,
  				struct v4l2_dv_timings *dv_timings)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct vpbe_device *vpbe_dev = layer->disp_dev->vpbe_dev;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "VIDIOC_G_DV_TIMINGS\n");
  
  	/* Get the given standard in the encoder */
  
  	if (vpbe_dev->current_timings.timings_type &
  				VPBE_ENC_DV_TIMINGS) {
  		*dv_timings = vpbe_dev->current_timings.dv_timings;
  	} else {
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /*
   * 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_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;
  
  	/* creating context for file descriptor */
  	err = v4l2_fh_open(file);
  	if (err) {
  		v4l2_err(&vpbe_dev->v4l2_dev, "v4l2_fh_open failed\n");
  		return err;
  	}
  
  	/* leaving if layer is already initialized */
  	if (!v4l2_fh_is_singular_file(file))
  		return err;
  
  	if (!layer->usrs) {
  		if (mutex_lock_interruptible(&layer->opslock))
  			return -ERESTARTSYS;
  		/* First claim the layer for this device */
  		err = osd_device->ops.request_layer(osd_device,
  						layer->layer_info.id);
  		mutex_unlock(&layer->opslock);
  		if (err < 0) {
  			/* Couldn't get layer */
  			v4l2_err(&vpbe_dev->v4l2_dev,
  				"Display Manager failed to allocate layer\n");
  			v4l2_fh_release(file);
  			return -EINVAL;
  		}
  	}
  	/* Increment layer usrs counter */
  	layer->usrs++;
  	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)
  {
  	struct vpbe_layer *layer = video_drvdata(file);
  	struct osd_layer_config *cfg  = &layer->layer_info.config;
  	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;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_release\n");
  
  	mutex_lock(&layer->opslock);
  
  	osd_device->ops.disable_layer(osd_device,
  			layer->layer_info.id);
  	/* 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);
  	}
  
  	_vb2_fop_release(file, NULL);
  	mutex_unlock(&layer->opslock);
  
  	disp_dev->cbcr_ofst = 0;
  
  	return 0;
  }
  
  /* 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		 = vb2_ioctl_reqbufs,
  	.vidioc_create_bufs	 = vb2_ioctl_create_bufs,
  	.vidioc_querybuf	 = vb2_ioctl_querybuf,
  	.vidioc_qbuf		 = vb2_ioctl_qbuf,
  	.vidioc_dqbuf		 = vb2_ioctl_dqbuf,
  	.vidioc_streamon	 = vb2_ioctl_streamon,
  	.vidioc_streamoff	 = vb2_ioctl_streamoff,
  	.vidioc_expbuf		 = vb2_ioctl_expbuf,
  
  	.vidioc_g_pixelaspect	 = vpbe_display_g_pixelaspect,
  	.vidioc_g_selection	 = vpbe_display_g_selection,
  	.vidioc_s_selection	 = vpbe_display_s_selection,
  
  	.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_timings	 = vpbe_display_s_dv_timings,
  	.vidioc_g_dv_timings	 = vpbe_display_g_dv_timings,
  	.vidioc_enum_dv_timings	 = vpbe_display_enum_dv_timings,
  };
  
  static const struct v4l2_file_operations vpbe_fops = {
  	.owner = THIS_MODULE,
  	.open = vpbe_display_open,
  	.release = vpbe_display_release,
  	.unlocked_ioctl = video_ioctl2,
  	.mmap = vb2_fop_mmap,
  	.poll =  vb2_fop_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 (strstr(pdev->name, "vpbe-osd"))
  		vpbe_disp->osd_device = platform_get_drvdata(pdev);
  
  	return 0;
  }
  
  static 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(*disp_dev->dev[i]), GFP_KERNEL);
  	if (!disp_dev->dev[i])
  		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;
  	vbd->vfl_dir	= VFL_DIR_TX;
  	vbd->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
  
  	if (disp_dev->vpbe_dev->current_timings.timings_type &
  			VPBE_ENC_STD)
  		vbd->tvnorms = (V4L2_STD_525_60 | V4L2_STD_625_50);
  
  	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);
  
  
  	return 0;
  }
  
  static 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=%p,layer->video_dev=%p\n",
  		  vpbe_display_layer,
  		  &vpbe_display_layer->video_dev);
  
  	vpbe_display_layer->video_dev.queue = &vpbe_display_layer->buffer_queue;
  	err = video_register_device(&vpbe_display_layer->video_dev,
  				    VFL_TYPE_VIDEO,
  				    -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 int vpbe_display_probe(struct platform_device *pdev)
  {
  	struct vpbe_display *disp_dev;
  	struct v4l2_device *v4l2_dev;
  	struct resource *res = NULL;
  	struct vb2_queue *q;
  	int k;
  	int i;
  	int err;
  	int irq;
  
  	printk(KERN_DEBUG "vpbe_display_probe\n");
  	/* Allocate memory for vpbe_display */
  	disp_dev = devm_kzalloc(&pdev->dev, sizeof(*disp_dev), GFP_KERNEL);
  	if (!disp_dev)
  		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;
  
  	v4l2_dev = &disp_dev->vpbe_dev->v4l2_dev;
  	/* Initialize the vpbe display controller */
  	if (disp_dev->vpbe_dev->ops.initialize) {
  		err = disp_dev->vpbe_dev->ops.initialize(&pdev->dev,
  							 disp_dev->vpbe_dev);
  		if (err) {
  			v4l2_err(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(v4l2_dev, "Unable to get VENC interrupt resource\n");
  		err = -ENODEV;
  		goto probe_out;
  	}
  
  	irq = res->start;
  	err = devm_request_irq(&pdev->dev, irq, venc_isr, 0,
  			       VPBE_DISPLAY_DRIVER, disp_dev);
  	if (err) {
  		v4l2_err(v4l2_dev, "VPBE IRQ request failed\n");
  		goto probe_out;
  	}
  
  	for (i = 0; i < VPBE_DISPLAY_MAX_DEVICES; i++) {
  		/* initialize vb2 queue */
  		q = &disp_dev->dev[i]->buffer_queue;
  		memset(q, 0, sizeof(*q));
  		q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
  		q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
  		q->drv_priv = disp_dev->dev[i];
  		q->ops = &video_qops;
  		q->mem_ops = &vb2_dma_contig_memops;
  		q->buf_struct_size = sizeof(struct vpbe_disp_buffer);
  		q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
  		q->min_buffers_needed = 1;
  		q->lock = &disp_dev->dev[i]->opslock;
  		q->dev = disp_dev->vpbe_dev->pdev;
  		err = vb2_queue_init(q);
  		if (err) {
  			v4l2_err(v4l2_dev, "vb2_queue_init() failed\n");
  			goto probe_out;
  		}
  
  		INIT_LIST_HEAD(&disp_dev->dev[i]->dma_queue);
  
  		if (register_device(disp_dev->dev[i], disp_dev, pdev)) {
  			err = -ENODEV;
  			goto probe_out;
  		}
  	}
  
  	v4l2_dbg(1, debug, v4l2_dev,
  		 "Successfully completed the probing of vpbe v4l2 device\n");
  
  	return 0;
  
  probe_out:
  	for (k = 0; k < VPBE_DISPLAY_MAX_DEVICES; k++) {
  		/* Unregister video device */
  		if (disp_dev->dev[k]) {
  			video_unregister_device(&disp_dev->dev[k]->video_dev);
  			kfree(disp_dev->dev[k]);
  		}
  	}
  	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;
  	int i;
  
  	v4l2_dbg(1, debug, &vpbe_dev->v4l2_dev, "vpbe_display_remove\n");
  
  	/* deinitialize the vpbe display controller */
  	if (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,
  		.bus = &platform_bus_type,
  	},
  	.probe = vpbe_display_probe,
  	.remove = 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");
  