text: /*
   * vpif-display - VPIF display driver
   * Display driver for TI DaVinci VPIF
   *
   * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
   * Copyright (C) 2014 Lad, Prabhakar <prabhakar.csengg@gmail.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 .as is. 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/interrupt.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/slab.h>
  
  #include <media/v4l2-ioctl.h>
  
  #include "vpif.h"
  #include "vpif_display.h"
  
  MODULE_DESCRIPTION("TI DaVinci VPIF Display driver");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(VPIF_DISPLAY_VERSION);
  
  #define VPIF_V4L2_STD (V4L2_STD_525_60 | V4L2_STD_625_50)
  
  #define vpif_err(fmt, arg...)	v4l2_err(&vpif_obj.v4l2_dev, fmt, ## arg)
  #define vpif_dbg(level, debug, fmt, arg...)	\
  		v4l2_dbg(level, debug, &vpif_obj.v4l2_dev, fmt, ## arg)
  
  static int debug = 1;
  
  module_param(debug, int, 0644);
  
  MODULE_PARM_DESC(debug, "Debug level 0-1");
  
  #define VPIF_DRIVER_NAME	"vpif_display"
  MODULE_ALIAS("platform:" VPIF_DRIVER_NAME);
  
  /* Is set to 1 in case of SDTV formats, 2 in case of HDTV formats. */
  static int ycmux_mode;
  
  static u8 channel_first_int[VPIF_NUMOBJECTS][2] = { {1, 1} };
  
  static struct vpif_device vpif_obj = { {NULL} };
  static struct device *vpif_dev;
  static void vpif_calculate_offsets(struct channel_obj *ch);
  static void vpif_config_addr(struct channel_obj *ch, int muxmode);
  
  static inline
  struct vpif_disp_buffer *to_vpif_buffer(struct vb2_v4l2_buffer *vb)
  {
  	return container_of(vb, struct vpif_disp_buffer, vb);
  }
  
  /**
   * vpif_buffer_prepare :  callback function for buffer prepare
   * @vb: ptr to vb2_buffer
   *
   * This is the callback function for buffer prepare when vb2_qbuf()
   * function is called. The buffer is prepared and user space virtual address
   * or user address is converted into  physical address
   */
  static int vpif_buffer_prepare(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
  	struct common_obj *common;
  
  	common = &ch->common[VPIF_VIDEO_INDEX];
  
  	vb2_set_plane_payload(vb, 0, common->fmt.fmt.pix.sizeimage);
  	if (vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
  		return -EINVAL;
  
  	vbuf->field = common->fmt.fmt.pix.field;
  
  	if (vb->vb2_queue->type != V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
  		unsigned long addr = vb2_dma_contig_plane_dma_addr(vb, 0);
  
  		if (!ISALIGNED(addr + common->ytop_off) ||
  			!ISALIGNED(addr + common->ybtm_off) ||
  			!ISALIGNED(addr + common->ctop_off) ||
  			!ISALIGNED(addr + common->cbtm_off)) {
  			vpif_err("buffer offset not aligned to 8 bytes\n");
  			return -EINVAL;
  		}
  	}
  
  	return 0;
  }
  
  /**
   * vpif_buffer_queue_setup : Callback function for buffer setup.
   * @vq: vb2_queue ptr
   * @nbuffers: ptr to number of buffers requested by application
   * @nplanes:: contains number of distinct video planes needed to hold a frame
   * @sizes: contains the size (in bytes) of each plane.
   * @alloc_devs: ptr to allocation context
   *
   * This callback function is called when reqbuf() is called to adjust
   * the buffer count and buffer size
   */
  static int vpif_buffer_queue_setup(struct vb2_queue *vq,
  				unsigned int *nbuffers, unsigned int *nplanes,
  				unsigned int sizes[], struct device *alloc_devs[])
  {
  	struct channel_obj *ch = vb2_get_drv_priv(vq);
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	unsigned size = common->fmt.fmt.pix.sizeimage;
  
  	if (*nplanes) {
  		if (sizes[0] < size)
  			return -EINVAL;
  		size = sizes[0];
  	}
  
  	if (vq->num_buffers + *nbuffers < 3)
  		*nbuffers = 3 - vq->num_buffers;
  
  	*nplanes = 1;
  	sizes[0] = size;
  
  	/* Calculate the offset for Y and C data  in the buffer */
  	vpif_calculate_offsets(ch);
  
  	return 0;
  }
  
  /**
   * vpif_buffer_queue : Callback function to add buffer to DMA queue
   * @vb: ptr to vb2_buffer
   *
   * This callback fucntion queues the buffer to DMA engine
   */
  static void vpif_buffer_queue(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct vpif_disp_buffer *buf = to_vpif_buffer(vbuf);
  	struct channel_obj *ch = vb2_get_drv_priv(vb->vb2_queue);
  	struct common_obj *common;
  	unsigned long flags;
  
  	common = &ch->common[VPIF_VIDEO_INDEX];
  
  	/* add the buffer to the DMA queue */
  	spin_lock_irqsave(&common->irqlock, flags);
  	list_add_tail(&buf->list, &common->dma_queue);
  	spin_unlock_irqrestore(&common->irqlock, flags);
  }
  
  /**
   * vpif_start_streaming : Starts the DMA engine for streaming
   * @vq: ptr to vb2_buffer
   * @count: number of buffers
   */
  static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
  {
  	struct vpif_display_config *vpif_config_data =
  					vpif_dev->platform_data;
  	struct channel_obj *ch = vb2_get_drv_priv(vq);
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct vpif_params *vpif = &ch->vpifparams;
  	struct vpif_disp_buffer *buf, *tmp;
  	unsigned long addr, flags;
  	int ret;
  
  	spin_lock_irqsave(&common->irqlock, flags);
  
  	/* Initialize field_id */
  	ch->field_id = 0;
  
  	/* clock settings */
  	if (vpif_config_data->set_clock) {
  		ret = vpif_config_data->set_clock(ch->vpifparams.std_info.
  		ycmux_mode, ch->vpifparams.std_info.hd_sd);
  		if (ret < 0) {
  			vpif_err("can't set clock\n");
  			goto err;
  		}
  	}
  
  	/* set the parameters and addresses */
  	ret = vpif_set_video_params(vpif, ch->channel_id + 2);
  	if (ret < 0)
  		goto err;
  
  	ycmux_mode = ret;
  	vpif_config_addr(ch, ret);
  	/* Get the next frame from the buffer queue */
  	common->next_frm = common->cur_frm =
  			    list_entry(common->dma_queue.next,
  				       struct vpif_disp_buffer, list);
  
  	list_del(&common->cur_frm->list);
  	spin_unlock_irqrestore(&common->irqlock, flags);
  
  	addr = vb2_dma_contig_plane_dma_addr(&common->cur_frm->vb.vb2_buf, 0);
  	common->set_addr((addr + common->ytop_off),
  			    (addr + common->ybtm_off),
  			    (addr + common->ctop_off),
  			    (addr + common->cbtm_off));
  
  	/*
  	 * Set interrupt for both the fields in VPIF
  	 * Register enable channel in VPIF register
  	 */
  	channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
  	if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
  		channel2_intr_assert();
  		channel2_intr_enable(1);
  		enable_channel2(1);
  		if (vpif_config_data->chan_config[VPIF_CHANNEL2_VIDEO].clip_en)
  			channel2_clipping_enable(1);
  	}
  
  	if (VPIF_CHANNEL3_VIDEO == ch->channel_id || ycmux_mode == 2) {
  		channel3_intr_assert();
  		channel3_intr_enable(1);
  		enable_channel3(1);
  		if (vpif_config_data->chan_config[VPIF_CHANNEL3_VIDEO].clip_en)
  			channel3_clipping_enable(1);
  	}
  
  	return 0;
  
  err:
  	list_for_each_entry_safe(buf, tmp, &common->dma_queue, list) {
  		list_del(&buf->list);
  		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
  	}
  	spin_unlock_irqrestore(&common->irqlock, flags);
  
  	return ret;
  }
  
  /**
   * vpif_stop_streaming : Stop the DMA engine
   * @vq: ptr to vb2_queue
   *
   * This callback stops the DMA engine and any remaining buffers
   * in the DMA queue are released.
   */
  static void vpif_stop_streaming(struct vb2_queue *vq)
  {
  	struct channel_obj *ch = vb2_get_drv_priv(vq);
  	struct common_obj *common;
  	unsigned long flags;
  
  	common = &ch->common[VPIF_VIDEO_INDEX];
  
  	/* Disable channel */
  	if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
  		enable_channel2(0);
  		channel2_intr_enable(0);
  	}
  	if (VPIF_CHANNEL3_VIDEO == ch->channel_id || ycmux_mode == 2) {
  		enable_channel3(0);
  		channel3_intr_enable(0);
  	}
  
  	/* release all active buffers */
  	spin_lock_irqsave(&common->irqlock, flags);
  	if (common->cur_frm == common->next_frm) {
  		vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
  				VB2_BUF_STATE_ERROR);
  	} else {
  		if (common->cur_frm)
  			vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
  					VB2_BUF_STATE_ERROR);
  		if (common->next_frm)
  			vb2_buffer_done(&common->next_frm->vb.vb2_buf,
  					VB2_BUF_STATE_ERROR);
  	}
  
  	while (!list_empty(&common->dma_queue)) {
  		common->next_frm = list_entry(common->dma_queue.next,
  						struct vpif_disp_buffer, list);
  		list_del(&common->next_frm->list);
  		vb2_buffer_done(&common->next_frm->vb.vb2_buf,
  				VB2_BUF_STATE_ERROR);
  	}
  	spin_unlock_irqrestore(&common->irqlock, flags);
  }
  
  static const struct vb2_ops video_qops = {
  	.queue_setup		= vpif_buffer_queue_setup,
  	.wait_prepare		= vb2_ops_wait_prepare,
  	.wait_finish		= vb2_ops_wait_finish,
  	.buf_prepare		= vpif_buffer_prepare,
  	.start_streaming	= vpif_start_streaming,
  	.stop_streaming		= vpif_stop_streaming,
  	.buf_queue		= vpif_buffer_queue,
  };
  
  static void process_progressive_mode(struct common_obj *common)
  {
  	unsigned long addr;
  
  	spin_lock(&common->irqlock);
  	/* Get the next buffer from buffer queue */
  	common->next_frm = list_entry(common->dma_queue.next,
  				struct vpif_disp_buffer, list);
  	/* Remove that buffer from the buffer queue */
  	list_del(&common->next_frm->list);
  	spin_unlock(&common->irqlock);
  
  	/* Set top and bottom field addrs in VPIF registers */
  	addr = vb2_dma_contig_plane_dma_addr(&common->next_frm->vb.vb2_buf, 0);
  	common->set_addr(addr + common->ytop_off,
  				 addr + common->ybtm_off,
  				 addr + common->ctop_off,
  				 addr + common->cbtm_off);
  }
  
  static void process_interlaced_mode(int fid, struct common_obj *common)
  {
  	/* device field id and local field id are in sync */
  	/* If this is even field */
  	if (0 == fid) {
  		if (common->cur_frm == common->next_frm)
  			return;
  
  		/* one frame is displayed If next frame is
  		 *  available, release cur_frm and move on */
  		/* Copy frame display time */
  		common->cur_frm->vb.vb2_buf.timestamp = ktime_get_ns();
  		/* Change status of the cur_frm */
  		vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
  					VB2_BUF_STATE_DONE);
  		/* Make cur_frm pointing to next_frm */
  		common->cur_frm = common->next_frm;
  
  	} else if (1 == fid) {	/* odd field */
  		spin_lock(&common->irqlock);
  		if (list_empty(&common->dma_queue)
  		    || (common->cur_frm != common->next_frm)) {
  			spin_unlock(&common->irqlock);
  			return;
  		}
  		spin_unlock(&common->irqlock);
  		/* one field is displayed configure the next
  		 * frame if it is available else hold on current
  		 * frame */
  		/* Get next from the buffer queue */
  		process_progressive_mode(common);
  	}
  }
  
  /*
   * vpif_channel_isr: It changes status of the displayed buffer, takes next
   * buffer from the queue and sets its address in VPIF registers
   */
  static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
  {
  	struct vpif_device *dev = &vpif_obj;
  	struct channel_obj *ch;
  	struct common_obj *common;
  	int fid = -1, i;
  	int channel_id;
  
  	channel_id = *(int *)(dev_id);
  	if (!vpif_intr_status(channel_id + 2))
  		return IRQ_NONE;
  
  	ch = dev->dev[channel_id];
  	for (i = 0; i < VPIF_NUMOBJECTS; i++) {
  		common = &ch->common[i];
  		/* If streaming is started in this channel */
  
  		if (1 == ch->vpifparams.std_info.frm_fmt) {
  			spin_lock(&common->irqlock);
  			if (list_empty(&common->dma_queue)) {
  				spin_unlock(&common->irqlock);
  				continue;
  			}
  			spin_unlock(&common->irqlock);
  
  			/* Progressive mode */
  			if (!channel_first_int[i][channel_id]) {
  				/* Mark status of the cur_frm to
  				 * done and unlock semaphore on it */
  				common->cur_frm->vb.vb2_buf.timestamp =
  						ktime_get_ns();
  				vb2_buffer_done(&common->cur_frm->vb.vb2_buf,
  						VB2_BUF_STATE_DONE);
  				/* Make cur_frm pointing to next_frm */
  				common->cur_frm = common->next_frm;
  			}
  
  			channel_first_int[i][channel_id] = 0;
  			process_progressive_mode(common);
  		} else {
  			/* Interlaced mode */
  			/* If it is first interrupt, ignore it */
  
  			if (channel_first_int[i][channel_id]) {
  				channel_first_int[i][channel_id] = 0;
  				continue;
  			}
  
  			if (0 == i) {
  				ch->field_id ^= 1;
  				/* Get field id from VPIF registers */
  				fid = vpif_channel_getfid(ch->channel_id + 2);
  				/* If fid does not match with stored field id */
  				if (fid != ch->field_id) {
  					/* Make them in sync */
  					if (0 == fid)
  						ch->field_id = fid;
  
  					return IRQ_HANDLED;
  				}
  			}
  			process_interlaced_mode(fid, common);
  		}
  	}
  
  	return IRQ_HANDLED;
  }
  
  static int vpif_update_std_info(struct channel_obj *ch)
  {
  	struct video_obj *vid_ch = &ch->video;
  	struct vpif_params *vpifparams = &ch->vpifparams;
  	struct vpif_channel_config_params *std_info = &vpifparams->std_info;
  	const struct vpif_channel_config_params *config;
  
  	int i;
  
  	for (i = 0; i < vpif_ch_params_count; i++) {
  		config = &vpif_ch_params[i];
  		if (config->hd_sd == 0) {
  			vpif_dbg(2, debug, "SD format\n");
  			if (config->stdid & vid_ch->stdid) {
  				memcpy(std_info, config, sizeof(*config));
  				break;
  			}
  		}
  	}
  
  	if (i == vpif_ch_params_count) {
  		vpif_dbg(1, debug, "Format not found\n");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int vpif_update_resolution(struct channel_obj *ch)
  {
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct video_obj *vid_ch = &ch->video;
  	struct vpif_params *vpifparams = &ch->vpifparams;
  	struct vpif_channel_config_params *std_info = &vpifparams->std_info;
  
  	if (!vid_ch->stdid && !vid_ch->dv_timings.bt.height)
  		return -EINVAL;
  
  	if (vid_ch->stdid) {
  		if (vpif_update_std_info(ch))
  			return -EINVAL;
  	}
  
  	common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
  	common->fmt.fmt.pix.width = std_info->width;
  	common->fmt.fmt.pix.height = std_info->height;
  	vpif_dbg(1, debug, "Pixel details: Width = %d,Height = %d\n",
  			common->fmt.fmt.pix.width, common->fmt.fmt.pix.height);
  
  	/* Set height and width paramateres */
  	common->height = std_info->height;
  	common->width = std_info->width;
  	common->fmt.fmt.pix.sizeimage = common->height * common->width * 2;
  
  	if (vid_ch->stdid)
  		common->fmt.fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
  	else
  		common->fmt.fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
  
  	if (ch->vpifparams.std_info.frm_fmt)
  		common->fmt.fmt.pix.field = V4L2_FIELD_NONE;
  	else
  		common->fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
  
  	return 0;
  }
  
  /*
   * vpif_calculate_offsets: This function calculates buffers offset for Y and C
   * in the top and bottom field
   */
  static void vpif_calculate_offsets(struct channel_obj *ch)
  {
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct vpif_params *vpifparams = &ch->vpifparams;
  	enum v4l2_field field = common->fmt.fmt.pix.field;
  	struct video_obj *vid_ch = &ch->video;
  	unsigned int hpitch, sizeimage;
  
  	if (V4L2_FIELD_ANY == common->fmt.fmt.pix.field) {
  		if (ch->vpifparams.std_info.frm_fmt)
  			vid_ch->buf_field = V4L2_FIELD_NONE;
  		else
  			vid_ch->buf_field = V4L2_FIELD_INTERLACED;
  	} else {
  		vid_ch->buf_field = common->fmt.fmt.pix.field;
  	}
  
  	sizeimage = common->fmt.fmt.pix.sizeimage;
  
  	hpitch = common->fmt.fmt.pix.bytesperline;
  	if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
  	    (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
  		common->ytop_off = 0;
  		common->ybtm_off = hpitch;
  		common->ctop_off = sizeimage / 2;
  		common->cbtm_off = sizeimage / 2 + hpitch;
  	} else if (V4L2_FIELD_SEQ_TB == vid_ch->buf_field) {
  		common->ytop_off = 0;
  		common->ybtm_off = sizeimage / 4;
  		common->ctop_off = sizeimage / 2;
  		common->cbtm_off = common->ctop_off + sizeimage / 4;
  	} else if (V4L2_FIELD_SEQ_BT == vid_ch->buf_field) {
  		common->ybtm_off = 0;
  		common->ytop_off = sizeimage / 4;
  		common->cbtm_off = sizeimage / 2;
  		common->ctop_off = common->cbtm_off + sizeimage / 4;
  	}
  
  	if ((V4L2_FIELD_NONE == vid_ch->buf_field) ||
  	    (V4L2_FIELD_INTERLACED == vid_ch->buf_field)) {
  		vpifparams->video_params.storage_mode = 1;
  	} else {
  		vpifparams->video_params.storage_mode = 0;
  	}
  
  	if (ch->vpifparams.std_info.frm_fmt == 1) {
  		vpifparams->video_params.hpitch =
  		    common->fmt.fmt.pix.bytesperline;
  	} else {
  		if ((field == V4L2_FIELD_ANY) ||
  			(field == V4L2_FIELD_INTERLACED))
  			vpifparams->video_params.hpitch =
  			    common->fmt.fmt.pix.bytesperline * 2;
  		else
  			vpifparams->video_params.hpitch =
  			    common->fmt.fmt.pix.bytesperline;
  	}
  
  	ch->vpifparams.video_params.stdid = ch->vpifparams.std_info.stdid;
  }
  
  static void vpif_config_addr(struct channel_obj *ch, int muxmode)
  {
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  
  	if (VPIF_CHANNEL3_VIDEO == ch->channel_id) {
  		common->set_addr = ch3_set_videobuf_addr;
  	} else {
  		if (2 == muxmode)
  			common->set_addr = ch2_set_videobuf_addr_yc_nmux;
  		else
  			common->set_addr = ch2_set_videobuf_addr;
  	}
  }
  
  /* functions implementing ioctls */
  /**
   * vpif_querycap() - QUERYCAP handler
   * @file: file ptr
   * @priv: file handle
   * @cap: ptr to v4l2_capability structure
   */
  static int vpif_querycap(struct file *file, void  *priv,
  				struct v4l2_capability *cap)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  
  	cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
  	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
  	strlcpy(cap->driver, VPIF_DRIVER_NAME, sizeof(cap->driver));
  	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
  		 dev_name(vpif_dev));
  	strlcpy(cap->card, config->card_name, sizeof(cap->card));
  
  	return 0;
  }
  
  static int vpif_enum_fmt_vid_out(struct file *file, void  *priv,
  					struct v4l2_fmtdesc *fmt)
  {
  	if (fmt->index != 0)
  		return -EINVAL;
  
  	/* Fill in the information about format */
  	fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
  	strcpy(fmt->description, "YCbCr4:2:2 YC Planar");
  	fmt->pixelformat = V4L2_PIX_FMT_YUV422P;
  	fmt->flags = 0;
  	return 0;
  }
  
  static int vpif_g_fmt_vid_out(struct file *file, void *priv,
  				struct v4l2_format *fmt)
  {
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  
  	/* Check the validity of the buffer type */
  	if (common->fmt.type != fmt->type)
  		return -EINVAL;
  
  	if (vpif_update_resolution(ch))
  		return -EINVAL;
  	*fmt = common->fmt;
  	return 0;
  }
  
  static int vpif_try_fmt_vid_out(struct file *file, void *priv,
  				struct v4l2_format *fmt)
  {
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
  
  	/*
  	 * to supress v4l-compliance warnings silently correct
  	 * the pixelformat
  	 */
  	if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P)
  		pixfmt->pixelformat = common->fmt.fmt.pix.pixelformat;
  
  	if (vpif_update_resolution(ch))
  		return -EINVAL;
  
  	pixfmt->colorspace = common->fmt.fmt.pix.colorspace;
  	pixfmt->field = common->fmt.fmt.pix.field;
  	pixfmt->bytesperline = common->fmt.fmt.pix.width;
  	pixfmt->width = common->fmt.fmt.pix.width;
  	pixfmt->height = common->fmt.fmt.pix.height;
  	pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height * 2;
  
  	return 0;
  }
  
  static int vpif_s_fmt_vid_out(struct file *file, void *priv,
  				struct v4l2_format *fmt)
  {
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
  	int ret;
  
  	if (vb2_is_busy(&common->buffer_queue))
  		return -EBUSY;
  
  	ret = vpif_try_fmt_vid_out(file, priv, fmt);
  	if (ret)
  		return ret;
  
  	/* store the pix format in the channel object */
  	common->fmt.fmt.pix = *pixfmt;
  
  	/* store the format in the channel object */
  	common->fmt = *fmt;
  	return 0;
  }
  
  static int vpif_s_std(struct file *file, void *priv, v4l2_std_id std_id)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct vpif_display_chan_config *chan_cfg;
  	struct v4l2_output output;
  	int ret;
  
  	if (!config->chan_config[ch->channel_id].outputs)
  		return -ENODATA;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  	output = chan_cfg->outputs[ch->output_idx].output;
  	if (output.capabilities != V4L2_OUT_CAP_STD)
  		return -ENODATA;
  
  	if (vb2_is_busy(&common->buffer_queue))
  		return -EBUSY;
  
  
  	if (!(std_id & VPIF_V4L2_STD))
  		return -EINVAL;
  
  	/* Call encoder subdevice function to set the standard */
  	ch->video.stdid = std_id;
  	memset(&ch->video.dv_timings, 0, sizeof(ch->video.dv_timings));
  	/* Get the information about the standard */
  	if (vpif_update_resolution(ch))
  		return -EINVAL;
  
  	common->fmt.fmt.pix.bytesperline = common->fmt.fmt.pix.width;
  
  	ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
  						s_std_output, std_id);
  	if (ret < 0) {
  		vpif_err("Failed to set output standard\n");
  		return ret;
  	}
  
  	ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
  							s_std, std_id);
  	if (ret < 0)
  		vpif_err("Failed to set standard for sub devices\n");
  	return ret;
  }
  
  static int vpif_g_std(struct file *file, void *priv, v4l2_std_id *std)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct vpif_display_chan_config *chan_cfg;
  	struct v4l2_output output;
  
  	if (!config->chan_config[ch->channel_id].outputs)
  		return -ENODATA;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  	output = chan_cfg->outputs[ch->output_idx].output;
  	if (output.capabilities != V4L2_OUT_CAP_STD)
  		return -ENODATA;
  
  	*std = ch->video.stdid;
  	return 0;
  }
  
  static int vpif_enum_output(struct file *file, void *fh,
  				struct v4l2_output *output)
  {
  
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct vpif_display_chan_config *chan_cfg;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  	if (output->index >= chan_cfg->output_count) {
  		vpif_dbg(1, debug, "Invalid output index\n");
  		return -EINVAL;
  	}
  
  	*output = chan_cfg->outputs[output->index].output;
  	return 0;
  }
  
  /**
   * vpif_output_to_subdev() - Maps output to sub device
   * @vpif_cfg: global config ptr
   * @chan_cfg: channel config ptr
   * @index: Given output index from application
   *
   * lookup the sub device information for a given output index.
   * we report all the output to application. output table also
   * has sub device name for the each output
   */
  static int
  vpif_output_to_subdev(struct vpif_display_config *vpif_cfg,
  		      struct vpif_display_chan_config *chan_cfg, int index)
  {
  	struct vpif_subdev_info *subdev_info;
  	const char *subdev_name;
  	int i;
  
  	vpif_dbg(2, debug, "vpif_output_to_subdev\n");
  
  	if (!chan_cfg->outputs)
  		return -1;
  
  	subdev_name = chan_cfg->outputs[index].subdev_name;
  	if (!subdev_name)
  		return -1;
  
  	/* loop through the sub device list to get the sub device info */
  	for (i = 0; i < vpif_cfg->subdev_count; i++) {
  		subdev_info = &vpif_cfg->subdevinfo[i];
  		if (!strcmp(subdev_info->name, subdev_name))
  			return i;
  	}
  	return -1;
  }
  
  /**
   * vpif_set_output() - Select an output
   * @vpif_cfg: global config ptr
   * @ch: channel
   * @index: Given output index from application
   *
   * Select the given output.
   */
  static int vpif_set_output(struct vpif_display_config *vpif_cfg,
  		      struct channel_obj *ch, int index)
  {
  	struct vpif_display_chan_config *chan_cfg =
  		&vpif_cfg->chan_config[ch->channel_id];
  	struct v4l2_subdev *sd = NULL;
  	u32 input = 0, output = 0;
  	int sd_index;
  	int ret;
  
  	sd_index = vpif_output_to_subdev(vpif_cfg, chan_cfg, index);
  	if (sd_index >= 0)
  		sd = vpif_obj.sd[sd_index];
  
  	if (sd) {
  		input = chan_cfg->outputs[index].input_route;
  		output = chan_cfg->outputs[index].output_route;
  		ret = v4l2_subdev_call(sd, video, s_routing, input, output, 0);
  		if (ret < 0 && ret != -ENOIOCTLCMD) {
  			vpif_err("Failed to set output\n");
  			return ret;
  		}
  
  	}
  	ch->output_idx = index;
  	ch->sd = sd;
  	if (chan_cfg->outputs)
  		/* update tvnorms from the sub device output info */
  		ch->video_dev.tvnorms = chan_cfg->outputs[index].output.std;
  	return 0;
  }
  
  static int vpif_s_output(struct file *file, void *priv, unsigned int i)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct vpif_display_chan_config *chan_cfg;
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  
  	if (vb2_is_busy(&common->buffer_queue))
  		return -EBUSY;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  
  	if (i >= chan_cfg->output_count)
  		return -EINVAL;
  
  	return vpif_set_output(config, ch, i);
  }
  
  static int vpif_g_output(struct file *file, void *priv, unsigned int *i)
  {
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  
  	*i = ch->output_idx;
  
  	return 0;
  }
  
  /**
   * vpif_enum_dv_timings() - ENUM_DV_TIMINGS handler
   * @file: file ptr
   * @priv: file handle
   * @timings: input timings
   */
  static int
  vpif_enum_dv_timings(struct file *file, void *priv,
  		     struct v4l2_enum_dv_timings *timings)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct vpif_display_chan_config *chan_cfg;
  	struct v4l2_output output;
  	int ret;
  
  	if (!config->chan_config[ch->channel_id].outputs)
  		return -ENODATA;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  	output = chan_cfg->outputs[ch->output_idx].output;
  	if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
  		return -ENODATA;
  
  	timings->pad = 0;
  
  	ret = v4l2_subdev_call(ch->sd, pad, enum_dv_timings, timings);
  	if (ret == -ENOIOCTLCMD || ret == -ENODEV)
  		return -EINVAL;
  	return ret;
  }
  
  /**
   * vpif_s_dv_timings() - S_DV_TIMINGS handler
   * @file: file ptr
   * @priv: file handle
   * @timings: digital video timings
   */
  static int vpif_s_dv_timings(struct file *file, void *priv,
  		struct v4l2_dv_timings *timings)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct vpif_params *vpifparams = &ch->vpifparams;
  	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
  	struct vpif_channel_config_params *std_info = &vpifparams->std_info;
  	struct video_obj *vid_ch = &ch->video;
  	struct v4l2_bt_timings *bt = &vid_ch->dv_timings.bt;
  	struct vpif_display_chan_config *chan_cfg;
  	struct v4l2_output output;
  	int ret;
  
  	if (!config->chan_config[ch->channel_id].outputs)
  		return -ENODATA;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  	output = chan_cfg->outputs[ch->output_idx].output;
  	if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
  		return -ENODATA;
  
  	if (vb2_is_busy(&common->buffer_queue))
  		return -EBUSY;
  
  	if (timings->type != V4L2_DV_BT_656_1120) {
  		vpif_dbg(2, debug, "Timing type not defined\n");
  		return -EINVAL;
  	}
  
  	/* Configure subdevice timings, if any */
  	ret = v4l2_subdev_call(ch->sd, video, s_dv_timings, timings);
  	if (ret == -ENOIOCTLCMD || ret == -ENODEV)
  		ret = 0;
  	if (ret < 0) {
  		vpif_dbg(2, debug, "Error setting custom DV timings\n");
  		return ret;
  	}
  
  	if (!(timings->bt.width && timings->bt.height &&
  				(timings->bt.hbackporch ||
  				 timings->bt.hfrontporch ||
  				 timings->bt.hsync) &&
  				timings->bt.vfrontporch &&
  				(timings->bt.vbackporch ||
  				 timings->bt.vsync))) {
  		vpif_dbg(2, debug, "Timings for width, height, horizontal back porch, horizontal sync, horizontal front porch, vertical back porch, vertical sync and vertical back porch must be defined\n");
  		return -EINVAL;
  	}
  
  	vid_ch->dv_timings = *timings;
  
  	/* Configure video port timings */
  
  	std_info->eav2sav = V4L2_DV_BT_BLANKING_WIDTH(bt) - 8;
  	std_info->sav2eav = bt->width;
  
  	std_info->l1 = 1;
  	std_info->l3 = bt->vsync + bt->vbackporch + 1;
  
  	std_info->vsize = V4L2_DV_BT_FRAME_HEIGHT(bt);
  	if (bt->interlaced) {
  		if (bt->il_vbackporch || bt->il_vfrontporch || bt->il_vsync) {
  			std_info->l5 = std_info->vsize/2 -
  				(bt->vfrontporch - 1);
  			std_info->l7 = std_info->vsize/2 + 1;
  			std_info->l9 = std_info->l7 + bt->il_vsync +
  				bt->il_vbackporch + 1;
  			std_info->l11 = std_info->vsize -
  				(bt->il_vfrontporch - 1);
  		} else {
  			vpif_dbg(2, debug, "Required timing values for interlaced BT format missing\n");
  			return -EINVAL;
  		}
  	} else {
  		std_info->l5 = std_info->vsize - (bt->vfrontporch - 1);
  	}
  	strncpy(std_info->name, "Custom timings BT656/1120",
  			VPIF_MAX_NAME);
  	std_info->width = bt->width;
  	std_info->height = bt->height;
  	std_info->frm_fmt = bt->interlaced ? 0 : 1;
  	std_info->ycmux_mode = 0;
  	std_info->capture_format = 0;
  	std_info->vbi_supported = 0;
  	std_info->hd_sd = 1;
  	std_info->stdid = 0;
  	vid_ch->stdid = 0;
  
  	return 0;
  }
  
  /**
   * vpif_g_dv_timings() - G_DV_TIMINGS handler
   * @file: file ptr
   * @priv: file handle
   * @timings: digital video timings
   */
  static int vpif_g_dv_timings(struct file *file, void *priv,
  		struct v4l2_dv_timings *timings)
  {
  	struct vpif_display_config *config = vpif_dev->platform_data;
  	struct video_device *vdev = video_devdata(file);
  	struct channel_obj *ch = video_get_drvdata(vdev);
  	struct vpif_display_chan_config *chan_cfg;
  	struct video_obj *vid_ch = &ch->video;
  	struct v4l2_output output;
  
  	if (!config->chan_config[ch->channel_id].outputs)
  		goto error;
  
  	chan_cfg = &config->chan_config[ch->channel_id];
  	output = chan_cfg->outputs[ch->output_idx].output;
  
  	if (output.capabilities != V4L2_OUT_CAP_DV_TIMINGS)
  		goto error;
  
  	*timings = vid_ch->dv_timings;
  
  	return 0;
  error:
  	return -ENODATA;
  }
  
  /*
   * vpif_log_status() - Status information
   * @file: file ptr
   * @priv: file handle
   *
   * Returns zero.
   */
  static int vpif_log_status(struct file *filep, void *priv)
  {
  	/* status for sub devices */
  	v4l2_device_call_all(&vpif_obj.v4l2_dev, 0, core, log_status);
  
  	return 0;
  }
  
  /* vpif display ioctl operations */
  static const struct v4l2_ioctl_ops vpif_ioctl_ops = {
  	.vidioc_querycap		= vpif_querycap,
  	.vidioc_enum_fmt_vid_out	= vpif_enum_fmt_vid_out,
  	.vidioc_g_fmt_vid_out		= vpif_g_fmt_vid_out,
  	.vidioc_s_fmt_vid_out		= vpif_s_fmt_vid_out,
  	.vidioc_try_fmt_vid_out		= vpif_try_fmt_vid_out,
  
  	.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_expbuf			= vb2_ioctl_expbuf,
  	.vidioc_streamon		= vb2_ioctl_streamon,
  	.vidioc_streamoff		= vb2_ioctl_streamoff,
  
  	.vidioc_s_std			= vpif_s_std,
  	.vidioc_g_std			= vpif_g_std,
  
  	.vidioc_enum_output		= vpif_enum_output,
  	.vidioc_s_output		= vpif_s_output,
  	.vidioc_g_output		= vpif_g_output,
  
  	.vidioc_enum_dv_timings		= vpif_enum_dv_timings,
  	.vidioc_s_dv_timings		= vpif_s_dv_timings,
  	.vidioc_g_dv_timings		= vpif_g_dv_timings,
  
  	.vidioc_log_status		= vpif_log_status,
  };
  
  static const struct v4l2_file_operations vpif_fops = {
  	.owner		= THIS_MODULE,
  	.open		= v4l2_fh_open,
  	.release	= vb2_fop_release,
  	.unlocked_ioctl	= video_ioctl2,
  	.mmap		= vb2_fop_mmap,
  	.poll		= vb2_fop_poll
  };
  
  /*Configure the channels, buffer sizei, request irq */
  static int initialize_vpif(void)
  {
  	int free_channel_objects_index;
  	int err, i, j;
  
  	/* Allocate memory for six channel objects */
  	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
  		vpif_obj.dev[i] =
  		    kzalloc(sizeof(struct channel_obj), GFP_KERNEL);
  		/* If memory allocation fails, return error */
  		if (!vpif_obj.dev[i]) {
  			free_channel_objects_index = i;
  			err = -ENOMEM;
  			goto vpif_init_free_channel_objects;
  		}
  	}
  
  	return 0;
  
  vpif_init_free_channel_objects:
  	for (j = 0; j < free_channel_objects_index; j++)
  		kfree(vpif_obj.dev[j]);
  	return err;
  }
  
  static void free_vpif_objs(void)
  {
  	int i;
  
  	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++)
  		kfree(vpif_obj.dev[i]);
  }
  
  static int vpif_async_bound(struct v4l2_async_notifier *notifier,
  			    struct v4l2_subdev *subdev,
  			    struct v4l2_async_subdev *asd)
  {
  	int i;
  
  	for (i = 0; i < vpif_obj.config->subdev_count; i++)
  		if (!strcmp(vpif_obj.config->subdevinfo[i].name,
  			    subdev->name)) {
  			vpif_obj.sd[i] = subdev;
  			vpif_obj.sd[i]->grp_id = 1 << i;
  			return 0;
  		}
  
  	return -EINVAL;
  }
  
  static int vpif_probe_complete(void)
  {
  	struct common_obj *common;
  	struct video_device *vdev;
  	struct channel_obj *ch;
  	struct vb2_queue *q;
  	int j, err, k;
  
  	for (j = 0; j < VPIF_DISPLAY_MAX_DEVICES; j++) {
  		ch = vpif_obj.dev[j];
  		/* Initialize field of the channel objects */
  		for (k = 0; k < VPIF_NUMOBJECTS; k++) {
  			common = &ch->common[k];
  			spin_lock_init(&common->irqlock);
  			mutex_init(&common->lock);
  			common->set_addr = NULL;
  			common->ytop_off = 0;
  			common->ybtm_off = 0;
  			common->ctop_off = 0;
  			common->cbtm_off = 0;
  			common->cur_frm = NULL;
  			common->next_frm = NULL;
  			memset(&common->fmt, 0, sizeof(common->fmt));
  		}
  		ch->initialized = 0;
  		if (vpif_obj.config->subdev_count)
  			ch->sd = vpif_obj.sd[0];
  		ch->channel_id = j;
  
  		memset(&ch->vpifparams, 0, sizeof(ch->vpifparams));
  
  		ch->common[VPIF_VIDEO_INDEX].fmt.type =
  						V4L2_BUF_TYPE_VIDEO_OUTPUT;
  
  		/* select output 0 */
  		err = vpif_set_output(vpif_obj.config, ch, 0);
  		if (err)
  			goto probe_out;
  
  		/* set initial format */
  		ch->video.stdid = V4L2_STD_525_60;
  		memset(&ch->video.dv_timings, 0, sizeof(ch->video.dv_timings));
  		vpif_update_resolution(ch);
  
  		/* Initialize vb2 queue */
  		q = &common->buffer_queue;
  		q->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
  		q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
  		q->drv_priv = ch;
  		q->ops = &video_qops;
  		q->mem_ops = &vb2_dma_contig_memops;
  		q->buf_struct_size = sizeof(struct vpif_disp_buffer);
  		q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
  		q->min_buffers_needed = 1;
  		q->lock = &common->lock;
  		q->dev = vpif_dev;
  		err = vb2_queue_init(q);
  		if (err) {
  			vpif_err("vpif_display: vb2_queue_init() failed\n");
  			goto probe_out;
  		}
  
  		INIT_LIST_HEAD(&common->dma_queue);
  
  		/* register video device */
  		vpif_dbg(1, debug, "channel=%p,channel->video_dev=%p\n",
  			 ch, &ch->video_dev);
  
  		/* Initialize the video_device structure */
  		vdev = &ch->video_dev;
  		strlcpy(vdev->name, VPIF_DRIVER_NAME, sizeof(vdev->name));
  		vdev->release = video_device_release_empty;
  		vdev->fops = &vpif_fops;
  		vdev->ioctl_ops = &vpif_ioctl_ops;
  		vdev->v4l2_dev = &vpif_obj.v4l2_dev;
  		vdev->vfl_dir = VFL_DIR_TX;
  		vdev->queue = q;
  		vdev->lock = &common->lock;
  		video_set_drvdata(&ch->video_dev, ch);
  		err = video_register_device(vdev, VFL_TYPE_GRABBER,
  					    (j ? 3 : 2));
  		if (err < 0)
  			goto probe_out;
  	}
  
  	return 0;
  
  probe_out:
  	for (k = 0; k < j; k++) {
  		ch = vpif_obj.dev[k];
  		common = &ch->common[k];
  		video_unregister_device(&ch->video_dev);
  	}
  	return err;
  }
  
  static int vpif_async_complete(struct v4l2_async_notifier *notifier)
  {
  	return vpif_probe_complete();
  }
  
  static const struct v4l2_async_notifier_operations vpif_async_ops = {
  	.bound = vpif_async_bound,
  	.complete = vpif_async_complete,
  };
  
  /*
   * vpif_probe: This function creates device entries by register itself to the
   * V4L2 driver and initializes fields of each channel objects
   */
  static __init int vpif_probe(struct platform_device *pdev)
  {
  	struct vpif_subdev_info *subdevdata;
  	struct i2c_adapter *i2c_adap;
  	struct resource *res;
  	int subdev_count;
  	int res_idx = 0;
  	int i, err;
  
  	if (!pdev->dev.platform_data) {
  		dev_warn(&pdev->dev, "Missing platform data.  Giving up.\n");
  		return -EINVAL;
  	}
  
  	vpif_dev = &pdev->dev;
  	err = initialize_vpif();
  
  	if (err) {
  		v4l2_err(vpif_dev->driver, "Error initializing vpif\n");
  		return err;
  	}
  
  	err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
  	if (err) {
  		v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
  		goto vpif_free;
  	}
  
  	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) {
  		err = devm_request_irq(&pdev->dev, res->start, vpif_channel_isr,
  					IRQF_SHARED, VPIF_DRIVER_NAME,
  					(void *)(&vpif_obj.dev[res_idx]->
  					channel_id));
  		if (err) {
  			err = -EINVAL;
  			vpif_err("VPIF IRQ request failed\n");
  			goto vpif_unregister;
  		}
  		res_idx++;
  	}
  
  	vpif_obj.config = pdev->dev.platform_data;
  	subdev_count = vpif_obj.config->subdev_count;
  	subdevdata = vpif_obj.config->subdevinfo;
  	vpif_obj.sd = kcalloc(subdev_count, sizeof(*vpif_obj.sd), GFP_KERNEL);
  	if (!vpif_obj.sd) {
  		err = -ENOMEM;
  		goto vpif_unregister;
  	}
  
  	if (!vpif_obj.config->asd_sizes) {
  		i2c_adap = i2c_get_adapter(vpif_obj.config->i2c_adapter_id);
  		for (i = 0; i < subdev_count; i++) {
  			vpif_obj.sd[i] =
  				v4l2_i2c_new_subdev_board(&vpif_obj.v4l2_dev,
  							  i2c_adap,
  							  &subdevdata[i].
  							  board_info,
  							  NULL);
  			if (!vpif_obj.sd[i]) {
  				vpif_err("Error registering v4l2 subdevice\n");
  				err = -ENODEV;
  				goto probe_subdev_out;
  			}
  
  			if (vpif_obj.sd[i])
  				vpif_obj.sd[i]->grp_id = 1 << i;
  		}
  		err = vpif_probe_complete();
  		if (err) {
  			goto probe_subdev_out;
  		}
  	} else {
  		vpif_obj.notifier.subdevs = vpif_obj.config->asd;
  		vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0];
  		vpif_obj.notifier.ops = &vpif_async_ops;
  		err = v4l2_async_notifier_register(&vpif_obj.v4l2_dev,
  						   &vpif_obj.notifier);
  		if (err) {
  			vpif_err("Error registering async notifier\n");
  			err = -EINVAL;
  			goto probe_subdev_out;
  		}
  	}
  
  	return 0;
  
  probe_subdev_out:
  	kfree(vpif_obj.sd);
  vpif_unregister:
  	v4l2_device_unregister(&vpif_obj.v4l2_dev);
  vpif_free:
  	free_vpif_objs();
  
  	return err;
  }
  
  /*
   * vpif_remove: It un-register channels from V4L2 driver
   */
  static int vpif_remove(struct platform_device *device)
  {
  	struct channel_obj *ch;
  	int i;
  
  	v4l2_device_unregister(&vpif_obj.v4l2_dev);
  
  	kfree(vpif_obj.sd);
  	/* un-register device */
  	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
  		/* Get the pointer to the channel object */
  		ch = vpif_obj.dev[i];
  		/* Unregister video device */
  		video_unregister_device(&ch->video_dev);
  	}
  	free_vpif_objs();
  
  	return 0;
  }
  
  #ifdef CONFIG_PM_SLEEP
  static int vpif_suspend(struct device *dev)
  {
  	struct common_obj *common;
  	struct channel_obj *ch;
  	int i;
  
  	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
  		/* Get the pointer to the channel object */
  		ch = vpif_obj.dev[i];
  		common = &ch->common[VPIF_VIDEO_INDEX];
  
  		if (!vb2_start_streaming_called(&common->buffer_queue))
  			continue;
  
  		mutex_lock(&common->lock);
  		/* Disable channel */
  		if (ch->channel_id == VPIF_CHANNEL2_VIDEO) {
  			enable_channel2(0);
  			channel2_intr_enable(0);
  		}
  		if (ch->channel_id == VPIF_CHANNEL3_VIDEO ||
  			ycmux_mode == 2) {
  			enable_channel3(0);
  			channel3_intr_enable(0);
  		}
  		mutex_unlock(&common->lock);
  	}
  
  	return 0;
  }
  
  static int vpif_resume(struct device *dev)
  {
  
  	struct common_obj *common;
  	struct channel_obj *ch;
  	int i;
  
  	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
  		/* Get the pointer to the channel object */
  		ch = vpif_obj.dev[i];
  		common = &ch->common[VPIF_VIDEO_INDEX];
  
  		if (!vb2_start_streaming_called(&common->buffer_queue))
  			continue;
  
  		mutex_lock(&common->lock);
  		/* Enable channel */
  		if (ch->channel_id == VPIF_CHANNEL2_VIDEO) {
  			enable_channel2(1);
  			channel2_intr_enable(1);
  		}
  		if (ch->channel_id == VPIF_CHANNEL3_VIDEO ||
  				ycmux_mode == 2) {
  			enable_channel3(1);
  			channel3_intr_enable(1);
  		}
  		mutex_unlock(&common->lock);
  	}
  
  	return 0;
  }
  
  #endif
  
  static SIMPLE_DEV_PM_OPS(vpif_pm_ops, vpif_suspend, vpif_resume);
  
  static __refdata struct platform_driver vpif_driver = {
  	.driver	= {
  			.name	= VPIF_DRIVER_NAME,
  			.pm	= &vpif_pm_ops,
  	},
  	.probe	= vpif_probe,
  	.remove	= vpif_remove,
  };
  
  module_platform_driver(vpif_driver);
  