V4L/DVB (12176): davinci/vpif_display: Add VPIF display driver

Adds the VPIF display driver and the associated header file.
Signed-off-by: Manjunath Hadli <mrh@ti.com>
Signed-off-by: Brijesh Jadav <brijesh.j@ti.com>
Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/davinci/vpif_display.c

+/*
+ * vpif-display - VPIF display driver
+ * Display driver for TI DaVinci VPIF
+ *
+ * Copyright (C) 2009 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 .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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/string.h>
+#include <linux/videodev2.h>
+#include <linux/wait.h>
+#include <linux/time.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/version.h>
+
+#include <asm/irq.h>
+#include <asm/page.h>
+
+#include <media/adv7343.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+
+#include <mach/dm646x.h>
+
+#include "vpif_display.h"
+#include "vpif.h"
+
+MODULE_DESCRIPTION("TI DaVinci VPIF Display driver");
+MODULE_LICENSE("GPL");
+
+#define DM646X_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;
+static u32 ch2_numbuffers = 3;
+static u32 ch3_numbuffers = 3;
+static u32 ch2_bufsize = 1920 * 1080 * 2;
+static u32 ch3_bufsize = 720 * 576 * 2;
+
+module_param(debug, int, 0644);
+module_param(ch2_numbuffers, uint, S_IRUGO);
+module_param(ch3_numbuffers, uint, S_IRUGO);
+module_param(ch2_bufsize, uint, S_IRUGO);
+module_param(ch3_bufsize, uint, S_IRUGO);
+
+MODULE_PARM_DESC(debug, "Debug level 0-1");
+MODULE_PARM_DESC(ch2_numbuffers, "Channel2 buffer count (default:3)");
+MODULE_PARM_DESC(ch3_numbuffers, "Channel3 buffer count (default:3)");
+MODULE_PARM_DESC(ch2_bufsize, "Channel2 buffer size (default:1920 x 1080 x 2)");
+MODULE_PARM_DESC(ch3_bufsize, "Channel3 buffer size (default:720 x 576 x 2)");
+
+static struct vpif_config_params config_params = {
+	.min_numbuffers		= 3,
+	.numbuffers[0]		= 3,
+	.numbuffers[1]		= 3,
+	.min_bufsize[0]		= 720 * 480 * 2,
+	.min_bufsize[1]		= 720 * 480 * 2,
+	.channel_bufsize[0]	= 1920 * 1080 * 2,
+	.channel_bufsize[1]	= 720 * 576 * 2,
+};
+
+static struct vpif_device vpif_obj = { {NULL} };
+static struct device *vpif_dev;
+
+static const struct vpif_channel_config_params ch_params[] = {
+	{
+		"NTSC", 720, 480, 30, 0, 1, 268, 1440, 1, 23, 263, 266,
+		286, 525, 525, 0, 1, 0, V4L2_STD_525_60,
+	},
+	{
+		"PAL", 720, 576, 25, 0, 1, 280, 1440, 1, 23, 311, 313,
+		336, 624, 625, 0, 1, 0, V4L2_STD_625_50,
+	},
+};
+
+/*
+ * vpif_uservirt_to_phys: This function is used to convert user
+ * space virtual address to physical address.
+ */
+static u32 vpif_uservirt_to_phys(u32 virtp)
+{
+	struct mm_struct *mm = current->mm;
+	unsigned long physp = 0;
+	struct vm_area_struct *vma;
+
+	vma = find_vma(mm, virtp);
+
+	/* For kernel direct-mapped memory, take the easy way */
+	if (virtp >= PAGE_OFFSET) {
+		physp = virt_to_phys((void *)virtp);
+	} else if (vma && (vma->vm_flags & VM_IO) && (vma->vm_pgoff)) {
+		/* this will catch, kernel-allocated, mmaped-to-usermode addr */
+		physp = (vma->vm_pgoff << PAGE_SHIFT) + (virtp - vma->vm_start);
+	} else {
+		/* otherwise, use get_user_pages() for general userland pages */
+		int res, nr_pages = 1;
+		struct page *pages;
+		down_read(&current->mm->mmap_sem);
+
+		res = get_user_pages(current, current->mm,
+				     virtp, nr_pages, 1, 0, &pages, NULL);
+		up_read(&current->mm->mmap_sem);
+
+		if (res == nr_pages) {
+			physp = __pa(page_address(&pages[0]) +
+							(virtp & ~PAGE_MASK));
+		} else {
+			vpif_err("get_user_pages failed\n");
+			return 0;
+		}
+	}
+
+	return physp;
+}
+
+/*
+ * 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 vpif_buffer_prepare(struct videobuf_queue *q,
+			       struct videobuf_buffer *vb,
+			       enum v4l2_field field)
+{
+	struct vpif_fh *fh = q->priv_data;
+	struct common_obj *common;
+	unsigned long addr;
+
+	common = &fh->channel->common[VPIF_VIDEO_INDEX];
+	if (VIDEOBUF_NEEDS_INIT == vb->state) {
+		vb->width	= common->width;
+		vb->height	= common->height;
+		vb->size	= vb->width * vb->height;
+		vb->field	= field;
+	}
+	vb->state = VIDEOBUF_PREPARED;
+
+	/* if user pointer memory mechanism is used, get the physical
+	 * address of the buffer */
+	if (V4L2_MEMORY_USERPTR == common->memory) {
+		if (!vb->baddr) {
+			vpif_err("buffer_address is 0\n");
+			return -EINVAL;
+		}
+
+		vb->boff = vpif_uservirt_to_phys(vb->baddr);
+		if (!ISALIGNED(vb->boff))
+			goto buf_align_exit;
+	}
+
+	addr = vb->boff;
+	if (q->streaming && (V4L2_BUF_TYPE_SLICED_VBI_OUTPUT != q->type)) {
+		if (!ISALIGNED(addr + common->ytop_off) ||
+		    !ISALIGNED(addr + common->ybtm_off) ||
+		    !ISALIGNED(addr + common->ctop_off) ||
+		    !ISALIGNED(addr + common->cbtm_off))
+			goto buf_align_exit;
+	}
+	return 0;
+
+buf_align_exit:
+	vpif_err("buffer offset not aligned to 8 bytes\n");
+	return -EINVAL;
+}
+
+/*
+ * vpif_buffer_setup: This function allocates memory for the buffers
+ */
+static int vpif_buffer_setup(struct videobuf_queue *q, unsigned int *count,
+				unsigned int *size)
+{
+	struct vpif_fh *fh = q->priv_data;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	if (V4L2_MEMORY_MMAP != common->memory)
+		return 0;
+
+	*size = config_params.channel_bufsize[ch->channel_id];
+	if (*count < config_params.min_numbuffers)
+		*count = config_params.min_numbuffers;
+
+	return 0;
+}
+
+/*
+ * vpif_buffer_queue: This function adds the buffer to DMA queue
+ */
+static void vpif_buffer_queue(struct videobuf_queue *q,
+			      struct videobuf_buffer *vb)
+{
+	struct vpif_fh *fh = q->priv_data;
+	struct common_obj *common;
+
+	common = &fh->channel->common[VPIF_VIDEO_INDEX];
+
+	/* add the buffer to the DMA queue */
+	list_add_tail(&vb->queue, &common->dma_queue);
+	vb->state = VIDEOBUF_QUEUED;
+}
+
+/*
+ * vpif_buffer_release: This function is called from the videobuf layer to
+ * free memory allocated to the buffers
+ */
+static void vpif_buffer_release(struct videobuf_queue *q,
+				struct videobuf_buffer *vb)
+{
+	struct vpif_fh *fh = q->priv_data;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common;
+	unsigned int buf_size = 0;
+
+	common = &ch->common[VPIF_VIDEO_INDEX];
+
+	videobuf_dma_contig_free(q, vb);
+	vb->state = VIDEOBUF_NEEDS_INIT;
+
+	if (V4L2_MEMORY_MMAP != common->memory)
+		return;
+
+	buf_size = config_params.channel_bufsize[ch->channel_id];
+}
+
+static struct videobuf_queue_ops video_qops = {
+	.buf_setup	= vpif_buffer_setup,
+	.buf_prepare	= vpif_buffer_prepare,
+	.buf_queue	= vpif_buffer_queue,
+	.buf_release	= vpif_buffer_release,
+};
+static u8 channel_first_int[VPIF_NUMOBJECTS][2] = { {1, 1} };
+
+static void process_progressive_mode(struct common_obj *common)
+{
+	unsigned long addr = 0;
+
+	/* Get the next buffer from buffer queue */
+	common->next_frm = list_entry(common->dma_queue.next,
+				struct videobuf_buffer, queue);
+	/* Remove that buffer from the buffer queue */
+	list_del(&common->next_frm->queue);
+	/* Mark status of the buffer as active */
+	common->next_frm->state = VIDEOBUF_ACTIVE;
+
+	/* Set top and bottom field addrs in VPIF registers */
+	addr = videobuf_to_dma_contig(common->next_frm);
+	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 */
+		do_gettimeofday(&common->cur_frm->ts);
+		/* Change status of the cur_frm */
+		common->cur_frm->state = VIDEOBUF_DONE;
+		/* unlock semaphore on cur_frm */
+		wake_up_interruptible(&common->cur_frm->done);
+		/* Make cur_frm pointing to next_frm */
+		common->cur_frm = common->next_frm;
+
+	} else if (1 == fid) {	/* odd field */
+		if (list_empty(&common->dma_queue)
+		    || (common->cur_frm != common->next_frm)) {
+			return;
+		}
+		/* 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;
+	enum v4l2_field field;
+	int fid = -1, i;
+	int channel_id = 0;
+
+	channel_id = *(int *)(dev_id);
+	ch = dev->dev[channel_id];
+	field = ch->common[VPIF_VIDEO_INDEX].fmt.fmt.pix.field;
+	for (i = 0; i < VPIF_NUMOBJECTS; i++) {
+		common = &ch->common[i];
+		/* If streaming is started in this channel */
+		if (0 == common->started)
+			continue;
+
+		if (1 == ch->vpifparams.std_info.frm_fmt) {
+			if (list_empty(&common->dma_queue))
+				continue;
+
+			/* Progressive mode */
+			if (!channel_first_int[i][channel_id]) {
+				/* Mark status of the cur_frm to
+				 * done and unlock semaphore on it */
+				do_gettimeofday(&common->cur_frm->ts);
+				common->cur_frm->state = VIDEOBUF_DONE;
+				wake_up_interruptible(&common->cur_frm->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_get_std_info(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;
+	const struct vpif_channel_config_params *config;
+
+	int index;
+
+	std_info->stdid = vid_ch->stdid;
+	if (!std_info)
+		return -1;
+
+	for (index = 0; index < ARRAY_SIZE(ch_params); index++) {
+		config = &ch_params[index];
+		if (config->stdid & std_info->stdid) {
+			memcpy(std_info, config, sizeof(*config));
+			break;
+		}
+	}
+
+	if (index == ARRAY_SIZE(ch_params))
+		return -1;
+
+	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 */
+	ch->common[VPIF_VIDEO_INDEX].height = std_info->height;
+	ch->common[VPIF_VIDEO_INDEX].width = std_info->width;
+
+	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, vpitch, 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;
+	}
+
+	if (V4L2_MEMORY_USERPTR == common->memory)
+		sizeimage = common->fmt.fmt.pix.sizeimage;
+	else
+		sizeimage = config_params.channel_bufsize[ch->channel_id];
+
+	hpitch = common->fmt.fmt.pix.bytesperline;
+	vpitch = sizeimage / (hpitch * 2);
+	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_format(struct channel_obj *ch)
+{
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	common->fmt.fmt.pix.field = V4L2_FIELD_ANY;
+	if (config_params.numbuffers[ch->channel_id] == 0)
+		common->memory = V4L2_MEMORY_USERPTR;
+	else
+		common->memory = V4L2_MEMORY_MMAP;
+
+	common->fmt.fmt.pix.sizeimage =
+			config_params.channel_bufsize[ch->channel_id];
+	common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
+	common->fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+}
+
+static int vpif_check_format(struct channel_obj *ch,
+			     struct v4l2_pix_format *pixfmt)
+{
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	enum v4l2_field field = pixfmt->field;
+	u32 sizeimage, hpitch, vpitch;
+
+	if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P)
+		goto invalid_fmt_exit;
+
+	if (!(VPIF_VALID_FIELD(field)))
+		goto invalid_fmt_exit;
+
+	if (pixfmt->bytesperline <= 0)
+		goto invalid_pitch_exit;
+
+	if (V4L2_MEMORY_USERPTR == common->memory)
+		sizeimage = pixfmt->sizeimage;
+	else
+		sizeimage = config_params.channel_bufsize[ch->channel_id];
+
+	if (vpif_get_std_info(ch)) {
+		vpif_err("Error getting the standard info\n");
+		return -EINVAL;
+	}
+
+	hpitch = pixfmt->bytesperline;
+	vpitch = sizeimage / (hpitch * 2);
+
+	/* Check for valid value of pitch */
+	if ((hpitch < ch->vpifparams.std_info.width) ||
+	    (vpitch < ch->vpifparams.std_info.height))
+		goto invalid_pitch_exit;
+
+	/* Check for 8 byte alignment */
+	if (!ISALIGNED(hpitch)) {
+		vpif_err("invalid pitch alignment\n");
+		return -EINVAL;
+	}
+	pixfmt->width = common->fmt.fmt.pix.width;
+	pixfmt->height = common->fmt.fmt.pix.height;
+
+	return 0;
+
+invalid_fmt_exit:
+	vpif_err("invalid field format\n");
+	return -EINVAL;
+
+invalid_pitch_exit:
+	vpif_err("invalid pitch\n");
+	return -EINVAL;
+}
+
+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;
+	}
+}
+
+/*
+ * vpif_mmap: It is used to map kernel space buffers into user spaces
+ */
+static int vpif_mmap(struct file *filep, struct vm_area_struct *vma)
+{
+	struct vpif_fh *fh = filep->private_data;
+	struct common_obj *common = &fh->channel->common[VPIF_VIDEO_INDEX];
+
+	return videobuf_mmap_mapper(&common->buffer_queue, vma);
+}
+
+/*
+ * vpif_poll: It is used for select/poll system call
+ */
+static unsigned int vpif_poll(struct file *filep, poll_table *wait)
+{
+	struct vpif_fh *fh = filep->private_data;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	if (common->started)
+		return videobuf_poll_stream(filep, &common->buffer_queue, wait);
+
+	return 0;
+}
+
+/*
+ * vpif_open: It creates object of file handle structure and stores it in
+ * private_data member of filepointer
+ */
+static int vpif_open(struct file *filep)
+{
+	struct video_device *vdev = video_devdata(filep);
+	struct channel_obj *ch = NULL;
+	struct vpif_fh *fh = NULL;
+
+	ch = video_get_drvdata(vdev);
+	/* Allocate memory for the file handle object */
+	fh = kmalloc(sizeof(struct vpif_fh), GFP_KERNEL);
+	if (fh == NULL) {
+		vpif_err("unable to allocate memory for file handle object\n");
+		return -ENOMEM;
+	}
+
+	/* store pointer to fh in private_data member of filep */
+	filep->private_data = fh;
+	fh->channel = ch;
+	fh->initialized = 0;
+	if (!ch->initialized) {
+		fh->initialized = 1;
+		ch->initialized = 1;
+		memset(&ch->vpifparams, 0, sizeof(ch->vpifparams));
+	}
+
+	/* Increment channel usrs counter */
+	atomic_inc(&ch->usrs);
+	/* Set io_allowed[VPIF_VIDEO_INDEX] member to false */
+	fh->io_allowed[VPIF_VIDEO_INDEX] = 0;
+	/* Initialize priority of this instance to default priority */
+	fh->prio = V4L2_PRIORITY_UNSET;
+	v4l2_prio_open(&ch->prio, &fh->prio);
+
+	return 0;
+}
+
+/*
+ * vpif_release: This function deletes buffer queue, frees the buffers and
+ * the vpif file handle
+ */
+static int vpif_release(struct file *filep)
+{
+	struct vpif_fh *fh = filep->private_data;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	mutex_lock_interruptible(&common->lock);
+	/* if this instance is doing IO */
+	if (fh->io_allowed[VPIF_VIDEO_INDEX]) {
+		/* Reset io_usrs member of channel object */
+		common->io_usrs = 0;
+		/* Disable channel */
+		if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
+			enable_channel2(0);
+			channel2_intr_enable(0);
+		}
+		if ((VPIF_CHANNEL3_VIDEO == ch->channel_id) ||
+		    (2 == common->started)) {
+			enable_channel3(0);
+			channel3_intr_enable(0);
+		}
+		common->started = 0;
+		/* Free buffers allocated */
+		videobuf_queue_cancel(&common->buffer_queue);
+		videobuf_mmap_free(&common->buffer_queue);
+		common->numbuffers =
+		    config_params.numbuffers[ch->channel_id];
+	}
+
+	mutex_unlock(&common->lock);
+
+	/* Decrement channel usrs counter */
+	atomic_dec(&ch->usrs);
+	/* If this file handle has initialize encoder device, reset it */
+	if (fh->initialized)
+		ch->initialized = 0;
+
+	/* Close the priority */
+	v4l2_prio_close(&ch->prio, &fh->prio);
+	filep->private_data = NULL;
+	fh->initialized = 0;
+	kfree(fh);
+
+	return 0;
+}
+
+/* functions implementing ioctls */
+
+static int vpif_querycap(struct file *file, void  *priv,
+				struct v4l2_capability *cap)
+{
+	struct vpif_config *config = vpif_dev->platform_data;
+
+	cap->version = VPIF_DISPLAY_VERSION_CODE;
+	cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+	strlcpy(cap->driver, "vpif display", sizeof(cap->driver));
+	strlcpy(cap->bus_info, "Platform", sizeof(cap->bus_info));
+	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) {
+		vpif_err("Invalid format index\n");
+		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;
+
+	return 0;
+}
+
+static int vpif_g_fmt_vid_out(struct file *file, void *priv,
+				struct v4l2_format *fmt)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	/* Check the validity of the buffer type */
+	if (common->fmt.type != fmt->type)
+		return -EINVAL;
+
+	/* Fill in the information about format */
+	mutex_lock_interruptible(&common->lock);
+	if (vpif_get_std_info(ch)) {
+		vpif_err("Error getting the standard info\n");
+		return -EINVAL;
+	}
+
+	*fmt = common->fmt;
+	mutex_unlock(&common->lock);
+	return 0;
+}
+
+static int vpif_s_fmt_vid_out(struct file *file, void *priv,
+				struct v4l2_format *fmt)
+{
+	struct vpif_fh *fh = priv;
+	struct v4l2_pix_format *pixfmt;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	int ret = 0;
+
+	if ((VPIF_CHANNEL2_VIDEO == ch->channel_id)
+	    || (VPIF_CHANNEL3_VIDEO == ch->channel_id)) {
+		if (!fh->initialized) {
+			vpif_dbg(1, debug, "Channel Busy\n");
+			return -EBUSY;
+		}
+
+		/* Check for the priority */
+		ret = v4l2_prio_check(&ch->prio, &fh->prio);
+		if (0 != ret)
+			return ret;
+		fh->initialized = 1;
+	}
+
+	if (common->started) {
+		vpif_dbg(1, debug, "Streaming in progress\n");
+		return -EBUSY;
+	}
+
+	pixfmt = &fmt->fmt.pix;
+	/* Check for valid field format */
+	ret = vpif_check_format(ch, pixfmt);
+	if (ret)
+		return ret;
+
+	/* store the pix format in the channel object */
+	common->fmt.fmt.pix = *pixfmt;
+	/* store the format in the channel object */
+	mutex_lock_interruptible(&common->lock);
+	common->fmt = *fmt;
+	mutex_unlock(&common->lock);
+
+	return 0;
+}
+
+static int vpif_try_fmt_vid_out(struct file *file, void *priv,
+				struct v4l2_format *fmt)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	struct v4l2_pix_format *pixfmt = &fmt->fmt.pix;
+	int ret = 0;
+
+	ret = vpif_check_format(ch, pixfmt);
+	if (ret) {
+		*pixfmt = common->fmt.fmt.pix;
+		pixfmt->sizeimage = pixfmt->width * pixfmt->height * 2;
+	}
+
+	return ret;
+}
+
+static int vpif_reqbufs(struct file *file, void *priv,
+			struct v4l2_requestbuffers *reqbuf)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common;
+	enum v4l2_field field;
+	u8 index = 0;
+	int ret = 0;
+
+	/* This file handle has not initialized the channel,
+	   It is not allowed to do settings */
+	if ((VPIF_CHANNEL2_VIDEO == ch->channel_id)
+	    || (VPIF_CHANNEL3_VIDEO == ch->channel_id)) {
+		if (!fh->initialized) {
+			vpif_err("Channel Busy\n");
+			return -EBUSY;
+		}
+	}
+
+	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != reqbuf->type)
+		return -EINVAL;
+
+	index = VPIF_VIDEO_INDEX;
+
+	common = &ch->common[index];
+	mutex_lock_interruptible(&common->lock);
+	if (common->fmt.type != reqbuf->type) {
+		ret = -EINVAL;
+		goto reqbuf_exit;
+	}
+
+	if (0 != common->io_usrs) {
+		ret = -EBUSY;
+		goto reqbuf_exit;
+	}
+
+	if (reqbuf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
+		if (common->fmt.fmt.pix.field == V4L2_FIELD_ANY)
+			field = V4L2_FIELD_INTERLACED;
+		else
+			field = common->fmt.fmt.pix.field;
+	} else {
+		field = V4L2_VBI_INTERLACED;
+	}
+
+	/* Initialize videobuf queue as per the buffer type */
+	videobuf_queue_dma_contig_init(&common->buffer_queue,
+					    &video_qops, NULL,
+					    &common->irqlock,
+					    reqbuf->type, field,
+					    sizeof(struct videobuf_buffer), fh);
+
+	/* Set io allowed member of file handle to TRUE */
+	fh->io_allowed[index] = 1;
+	/* Increment io usrs member of channel object to 1 */
+	common->io_usrs = 1;
+	/* Store type of memory requested in channel object */
+	common->memory = reqbuf->memory;
+	INIT_LIST_HEAD(&common->dma_queue);
+
+	/* Allocate buffers */
+	ret = videobuf_reqbufs(&common->buffer_queue, reqbuf);
+
+reqbuf_exit:
+	mutex_unlock(&common->lock);
+	return ret;
+}
+
+static int vpif_querybuf(struct file *file, void *priv,
+				struct v4l2_buffer *tbuf)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	if (common->fmt.type != tbuf->type)
+		return -EINVAL;
+
+	return videobuf_querybuf(&common->buffer_queue, tbuf);
+}
+
+static int vpif_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
+{
+
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	struct v4l2_buffer tbuf = *buf;
+	struct videobuf_buffer *buf1;
+	unsigned long addr = 0;
+	unsigned long flags;
+	int ret = 0;
+
+	if (common->fmt.type != tbuf.type)
+		return -EINVAL;
+
+	if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
+		vpif_err("fh->io_allowed\n");
+		return -EACCES;
+	}
+
+	if (!(list_empty(&common->dma_queue)) ||
+	    (common->cur_frm != common->next_frm) ||
+	    !(common->started) ||
+	    (common->started && (0 == ch->field_id)))
+		return videobuf_qbuf(&common->buffer_queue, buf);
+
+	/* bufferqueue is empty store buffer address in VPIF registers */
+	mutex_lock(&common->buffer_queue.vb_lock);
+	buf1 = common->buffer_queue.bufs[tbuf.index];
+	if (buf1->memory != tbuf.memory) {
+		vpif_err("invalid buffer type\n");
+		goto qbuf_exit;
+	}
+
+	if ((buf1->state == VIDEOBUF_QUEUED) ||
+	    (buf1->state == VIDEOBUF_ACTIVE)) {
+		vpif_err("invalid state\n");
+		goto qbuf_exit;
+	}
+
+	switch (buf1->memory) {
+	case V4L2_MEMORY_MMAP:
+		if (buf1->baddr == 0)
+			goto qbuf_exit;
+		break;
+
+	case V4L2_MEMORY_USERPTR:
+		if (tbuf.length < buf1->bsize)
+			goto qbuf_exit;
+
+		if ((VIDEOBUF_NEEDS_INIT != buf1->state)
+			    && (buf1->baddr != tbuf.m.userptr))
+			vpif_buffer_release(&common->buffer_queue, buf1);
+			buf1->baddr = tbuf.m.userptr;
+		break;
+
+	default:
+		goto qbuf_exit;
+	}
+
+	local_irq_save(flags);
+	ret = vpif_buffer_prepare(&common->buffer_queue, buf1,
+					common->buffer_queue.field);
+	if (ret < 0) {
+		local_irq_restore(flags);
+		goto qbuf_exit;
+	}
+
+	buf1->state = VIDEOBUF_ACTIVE;
+	addr = buf1->boff;
+	common->next_frm = buf1;
+	if (tbuf.type != V4L2_BUF_TYPE_SLICED_VBI_OUTPUT) {
+		common->set_addr((addr + common->ytop_off),
+				 (addr + common->ybtm_off),
+				 (addr + common->ctop_off),
+				 (addr + common->cbtm_off));
+	}
+
+	local_irq_restore(flags);
+	list_add_tail(&buf1->stream, &common->buffer_queue.stream);
+	mutex_unlock(&common->buffer_queue.vb_lock);
+	return 0;
+
+qbuf_exit:
+	mutex_unlock(&common->buffer_queue.vb_lock);
+	return -EINVAL;
+}
+
+static int vpif_s_std(struct file *file, void *priv, v4l2_std_id *std_id)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	int ret = 0;
+
+	if (!(*std_id & DM646X_V4L2_STD))
+		return -EINVAL;
+
+	if (common->started) {
+		vpif_err("streaming in progress\n");
+		return -EBUSY;
+	}
+
+	/* Call encoder subdevice function to set the standard */
+	mutex_lock_interruptible(&common->lock);
+
+	ch->video.stdid = *std_id;
+	/* Get the information about the standard */
+	if (vpif_get_std_info(ch)) {
+		vpif_err("Error getting the standard info\n");
+		return -EINVAL;
+	}
+
+	if ((ch->vpifparams.std_info.width *
+		ch->vpifparams.std_info.height * 2) >
+		config_params.channel_bufsize[ch->channel_id]) {
+		vpif_err("invalid std for this size\n");
+		ret = -EINVAL;
+		goto s_std_exit;
+	}
+
+	common->fmt.fmt.pix.bytesperline = common->fmt.fmt.pix.width;
+	/* Configure the default format information */
+	vpif_config_format(ch);
+
+	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");
+		goto s_std_exit;
+	}
+
+	ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, core,
+							s_std, *std_id);
+	if (ret < 0)
+		vpif_err("Failed to set standard for sub devices\n");
+
+s_std_exit:
+	mutex_unlock(&common->lock);
+	return ret;
+}
+
+static int vpif_g_std(struct file *file, void *priv, v4l2_std_id *std)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+
+	*std = ch->video.stdid;
+	return 0;
+}
+
+static int vpif_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	return videobuf_dqbuf(&common->buffer_queue, p,
+					(file->f_flags & O_NONBLOCK));
+}
+
+static int vpif_streamon(struct file *file, void *priv,
+				enum v4l2_buf_type buftype)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	struct channel_obj *oth_ch = vpif_obj.dev[!ch->channel_id];
+	struct vpif_params *vpif = &ch->vpifparams;
+	struct vpif_config *vpif_config_data =
+					vpif_dev->platform_data;
+	unsigned long addr = 0;
+	int ret = 0;
+
+	if (buftype != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
+		vpif_err("buffer type not supported\n");
+		return -EINVAL;
+	}
+
+	if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
+		vpif_err("fh->io_allowed\n");
+		return -EACCES;
+	}
+
+	/* If Streaming is already started, return error */
+	if (common->started) {
+		vpif_err("channel->started\n");
+		return -EBUSY;
+	}
+
+	if ((ch->channel_id == VPIF_CHANNEL2_VIDEO
+		&& oth_ch->common[VPIF_VIDEO_INDEX].started &&
+		ch->vpifparams.std_info.ycmux_mode == 0)
+		|| ((ch->channel_id == VPIF_CHANNEL3_VIDEO)
+		&& (2 == oth_ch->common[VPIF_VIDEO_INDEX].started))) {
+		vpif_err("other channel is using\n");
+		return -EBUSY;
+	}
+
+	ret = vpif_check_format(ch, &common->fmt.fmt.pix);
+	if (ret < 0)
+		return ret;
+
+	/* Call videobuf_streamon to start streaming  in videobuf */
+	ret = videobuf_streamon(&common->buffer_queue);
+	if (ret < 0) {
+		vpif_err("videobuf_streamon\n");
+		return ret;
+	}
+
+	mutex_lock_interruptible(&common->lock);
+	/* If buffer queue is empty, return error */
+	if (list_empty(&common->dma_queue)) {
+		vpif_err("buffer queue is empty\n");
+		ret = -EIO;
+		goto streamon_exit;
+	}
+
+	/* Get the next frame from the buffer queue */
+	common->next_frm = common->cur_frm =
+			    list_entry(common->dma_queue.next,
+				       struct videobuf_buffer, queue);
+
+	list_del(&common->cur_frm->queue);
+	/* Mark state of the current frame to active */
+	common->cur_frm->state = VIDEOBUF_ACTIVE;
+
+	/* Initialize field_id and started member */
+	ch->field_id = 0;
+	common->started = 1;
+	if (buftype == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
+		addr = common->cur_frm->boff;
+		/* Calculate the offset for Y and C data  in the buffer */
+		vpif_calculate_offsets(ch);
+
+		if ((ch->vpifparams.std_info.frm_fmt &&
+			((common->fmt.fmt.pix.field != V4L2_FIELD_NONE)
+			&& (common->fmt.fmt.pix.field != V4L2_FIELD_ANY)))
+			|| (!ch->vpifparams.std_info.frm_fmt
+			&& (common->fmt.fmt.pix.field == V4L2_FIELD_NONE))) {
+			vpif_err("conflict in field format and std format\n");
+			ret = -EINVAL;
+			goto streamon_exit;
+		}
+
+		/* clock settings */
+		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 streamon_exit;
+		}
+
+		/* set the parameters and addresses */
+		ret = vpif_set_video_params(vpif, ch->channel_id + 2);
+		if (ret < 0)
+			goto streamon_exit;
+
+		common->started = ret;
+		vpif_config_addr(ch, ret);
+		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 */
+		if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
+			channel2_intr_assert();
+			channel2_intr_enable(1);
+			enable_channel2(1);
+		}
+
+		if ((VPIF_CHANNEL3_VIDEO == ch->channel_id)
+			|| (common->started == 2)) {
+			channel3_intr_assert();
+			channel3_intr_enable(1);
+			enable_channel3(1);
+		}
+		channel_first_int[VPIF_VIDEO_INDEX][ch->channel_id] = 1;
+	}
+
+streamon_exit:
+	mutex_unlock(&common->lock);
+	return ret;
+}
+
+static int vpif_streamoff(struct file *file, void *priv,
+				enum v4l2_buf_type buftype)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+
+	if (buftype != V4L2_BUF_TYPE_VIDEO_OUTPUT) {
+		vpif_err("buffer type not supported\n");
+		return -EINVAL;
+	}
+
+	if (!fh->io_allowed[VPIF_VIDEO_INDEX]) {
+		vpif_err("fh->io_allowed\n");
+		return -EACCES;
+	}
+
+	if (!common->started) {
+		vpif_err("channel->started\n");
+		return -EINVAL;
+	}
+
+	mutex_lock_interruptible(&common->lock);
+	if (buftype == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
+		/* disable channel */
+		if (VPIF_CHANNEL2_VIDEO == ch->channel_id) {
+			enable_channel2(0);
+			channel2_intr_enable(0);
+		}
+		if ((VPIF_CHANNEL3_VIDEO == ch->channel_id) ||
+					(2 == common->started)) {
+			enable_channel3(0);
+			channel3_intr_enable(0);
+		}
+	}
+
+	common->started = 0;
+	mutex_unlock(&common->lock);
+
+	return videobuf_streamoff(&common->buffer_queue);
+}
+
+static int vpif_cropcap(struct file *file, void *priv,
+			struct v4l2_cropcap *crop)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	if (V4L2_BUF_TYPE_VIDEO_OUTPUT != crop->type)
+		return -EINVAL;
+
+	crop->bounds.left = crop->bounds.top = 0;
+	crop->defrect.left = crop->defrect.top = 0;
+	crop->defrect.height = crop->bounds.height = common->height;
+	crop->defrect.width = crop->bounds.width = common->width;
+
+	return 0;
+}
+
+static int vpif_enum_output(struct file *file, void *fh,
+				struct v4l2_output *output)
+{
+
+	struct vpif_config *config = vpif_dev->platform_data;
+
+	if (output->index >= config->output_count) {
+		vpif_dbg(1, debug, "Invalid output index\n");
+		return -EINVAL;
+	}
+
+	strcpy(output->name, config->output[output->index]);
+	output->type = V4L2_OUTPUT_TYPE_ANALOG;
+	output->std = DM646X_V4L2_STD;
+
+	return 0;
+}
+
+static int vpif_s_output(struct file *file, void *priv, unsigned int i)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct video_obj *vid_ch = &ch->video;
+	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
+	int ret = 0;
+
+	mutex_lock_interruptible(&common->lock);
+	if (common->started) {
+		vpif_err("Streaming in progress\n");
+		ret = -EBUSY;
+		goto s_output_exit;
+	}
+
+	ret = v4l2_device_call_until_err(&vpif_obj.v4l2_dev, 1, video,
+							s_routing, 0, i, 0);
+
+	if (ret < 0)
+		vpif_err("Failed to set output standard\n");
+
+	vid_ch->output_id = i;
+
+s_output_exit:
+	mutex_unlock(&common->lock);
+	return ret;
+}
+
+static int vpif_g_output(struct file *file, void *priv, unsigned int *i)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+	struct video_obj *vid_ch = &ch->video;
+
+	*i = vid_ch->output_id;
+
+	return 0;
+}
+
+static int vpif_g_priority(struct file *file, void *priv, enum v4l2_priority *p)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+
+	*p = v4l2_prio_max(&ch->prio);
+
+	return 0;
+}
+
+static int vpif_s_priority(struct file *file, void *priv, enum v4l2_priority p)
+{
+	struct vpif_fh *fh = priv;
+	struct channel_obj *ch = fh->channel;
+
+	return v4l2_prio_change(&ch->prio, &fh->prio, p);
+}
+
+/* vpif display ioctl operations */
+static const struct v4l2_ioctl_ops vpif_ioctl_ops = {
+	.vidioc_querycap        	= vpif_querycap,
+	.vidioc_g_priority		= vpif_g_priority,
+	.vidioc_s_priority		= vpif_s_priority,
+	.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         	= vpif_reqbufs,
+	.vidioc_querybuf        	= vpif_querybuf,
+	.vidioc_qbuf            	= vpif_qbuf,
+	.vidioc_dqbuf           	= vpif_dqbuf,
+	.vidioc_streamon        	= vpif_streamon,
+	.vidioc_streamoff       	= vpif_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_cropcap         	= vpif_cropcap,
+};
+
+static const struct v4l2_file_operations vpif_fops = {
+	.owner		= THIS_MODULE,
+	.open		= vpif_open,
+	.release	= vpif_release,
+	.ioctl		= video_ioctl2,
+	.mmap		= vpif_mmap,
+	.poll		= vpif_poll
+};
+
+static struct video_device vpif_video_template = {
+	.name		= "vpif",
+	.fops		= &vpif_fops,
+	.minor		= -1,
+	.ioctl_ops	= &vpif_ioctl_ops,
+	.tvnorms	= DM646X_V4L2_STD,
+	.current_norm	= V4L2_STD_625_50,
+
+};
+
+/*Configure the channels, buffer sizei, request irq */
+static int initialize_vpif(void)
+{
+	int free_channel_objects_index;
+	int free_buffer_channel_index;
+	int free_buffer_index;
+	int err = 0, i, j;
+
+	/* Default number of buffers should be 3 */
+	if ((ch2_numbuffers > 0) &&
+	    (ch2_numbuffers < config_params.min_numbuffers))
+		ch2_numbuffers = config_params.min_numbuffers;
+	if ((ch3_numbuffers > 0) &&
+	    (ch3_numbuffers < config_params.min_numbuffers))
+		ch3_numbuffers = config_params.min_numbuffers;
+
+	/* Set buffer size to min buffers size if invalid buffer size is
+	 * given */
+	if (ch2_bufsize < config_params.min_bufsize[VPIF_CHANNEL2_VIDEO])
+		ch2_bufsize =
+		    config_params.min_bufsize[VPIF_CHANNEL2_VIDEO];
+	if (ch3_bufsize < config_params.min_bufsize[VPIF_CHANNEL3_VIDEO])
+		ch3_bufsize =
+		    config_params.min_bufsize[VPIF_CHANNEL3_VIDEO];
+
+	config_params.numbuffers[VPIF_CHANNEL2_VIDEO] = ch2_numbuffers;
+
+	if (ch2_numbuffers) {
+		config_params.channel_bufsize[VPIF_CHANNEL2_VIDEO] =
+							ch2_bufsize;
+	}
+	config_params.numbuffers[VPIF_CHANNEL3_VIDEO] = ch3_numbuffers;
+
+	if (ch3_numbuffers) {
+		config_params.channel_bufsize[VPIF_CHANNEL3_VIDEO] =
+							ch3_bufsize;
+	}
+
+	/* Allocate memory for six channel objects */
+	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
+		vpif_obj.dev[i] =
+		    kmalloc(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;
+		}
+	}
+
+	free_channel_objects_index = VPIF_DISPLAY_MAX_DEVICES;
+	free_buffer_channel_index = VPIF_DISPLAY_NUM_CHANNELS;
+	free_buffer_index = config_params.numbuffers[i - 1];
+
+	return 0;
+
+vpif_init_free_channel_objects:
+	for (j = 0; j < free_channel_objects_index; j++)
+		kfree(vpif_obj.dev[j]);
+	return err;
+}
+
+/*
+ * 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)
+{
+	const struct subdev_info *subdevdata;
+	int i, j = 0, k, q, m, err = 0;
+	struct i2c_adapter *i2c_adap;
+	struct vpif_config *config;
+	struct common_obj *common;
+	struct channel_obj *ch;
+	struct video_device *vfd;
+	struct resource *res;
+	int subdev_count;
+
+	vpif_dev = &pdev->dev;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		v4l2_err(vpif_dev->driver,
+				"Error getting platform resource\n");
+		return -ENOENT;
+	}
+
+	if (!request_mem_region(res->start, res->end - res->start + 1,
+						vpif_dev->driver->name)) {
+		v4l2_err(vpif_dev->driver, "VPIF: failed request_mem_region\n");
+		return -ENXIO;
+	}
+
+	vpif_base = ioremap_nocache(res->start, res->end - res->start + 1);
+	if (!vpif_base) {
+		v4l2_err(vpif_dev->driver, "Unable to ioremap VPIF reg\n");
+		err = -ENXIO;
+		goto resource_exit;
+	}
+
+	vpif_base_addr_init(vpif_base);
+
+	initialize_vpif();
+
+	err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev);
+	if (err) {
+		v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n");
+		return err;
+	}
+
+	k = 0;
+	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, k))) {
+		for (i = res->start; i <= res->end; i++) {
+			if (request_irq(i, vpif_channel_isr, IRQF_DISABLED,
+					"DM646x_Display",
+				(void *)(&vpif_obj.dev[k]->channel_id))) {
+				err = -EBUSY;
+				goto vpif_int_err;
+			}
+		}
+		k++;
+	}
+
+	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) {
+
+		/* Get the pointer to the channel object */
+		ch = vpif_obj.dev[i];
+
+		/* Allocate memory for video device */
+		vfd = video_device_alloc();
+		if (vfd == NULL) {
+			for (j = 0; j < i; j++) {
+				ch = vpif_obj.dev[j];
+				video_device_release(ch->video_dev);
+			}
+			err = -ENOMEM;
+			goto video_dev_alloc_exit;
+		}
+
+		/* Initialize field of video device */
+		*vfd = vpif_video_template;
+		vfd->v4l2_dev = &vpif_obj.v4l2_dev;
+		vfd->release = video_device_release;
+		snprintf(vfd->name, sizeof(vfd->name),
+			 "DM646x_VPIFDisplay_DRIVER_V%d.%d.%d",
+			 (VPIF_DISPLAY_VERSION_CODE >> 16) & 0xff,
+			 (VPIF_DISPLAY_VERSION_CODE >> 8) & 0xff,
+			 (VPIF_DISPLAY_VERSION_CODE) & 0xff);
+
+		/* Set video_dev to the video device */
+		ch->video_dev = vfd;
+	}
+
+	for (j = 0; j < VPIF_DISPLAY_MAX_DEVICES; j++) {
+		ch = vpif_obj.dev[j];
+		/* Initialize field of the channel objects */
+		atomic_set(&ch->usrs, 0);
+		for (k = 0; k < VPIF_NUMOBJECTS; k++) {
+			ch->common[k].numbuffers = 0;
+			common = &ch->common[k];
+			common->io_usrs = 0;
+			common->started = 0;
+			spin_lock_init(&common->irqlock);
+			mutex_init(&common->lock);
+			common->numbuffers = 0;
+			common->set_addr = NULL;
+			common->ytop_off = common->ybtm_off = 0;
+			common->ctop_off = common->cbtm_off = 0;
+			common->cur_frm = common->next_frm = NULL;
+			memset(&common->fmt, 0, sizeof(common->fmt));
+			common->numbuffers = config_params.numbuffers[k];
+
+		}
+		ch->initialized = 0;
+		ch->channel_id = j;
+		if (j < 2)
+			ch->common[VPIF_VIDEO_INDEX].numbuffers =
+			    config_params.numbuffers[ch->channel_id];
+		else
+			ch->common[VPIF_VIDEO_INDEX].numbuffers = 0;
+
+		memset(&ch->vpifparams, 0, sizeof(ch->vpifparams));
+
+		/* Initialize prio member of channel object */
+		v4l2_prio_init(&ch->prio);
+		ch->common[VPIF_VIDEO_INDEX].fmt.type =
+						V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+		/* register video device */
+		vpif_dbg(1, debug, "channel=%x,channel->video_dev=%x\n",
+				(int)ch, (int)&ch->video_dev);
+
+		err = video_register_device(ch->video_dev,
+					  VFL_TYPE_GRABBER, (j ? 3 : 2));
+		if (err < 0)
+			goto probe_out;
+
+		video_set_drvdata(ch->video_dev, ch);
+	}
+
+	i2c_adap = i2c_get_adapter(1);
+	config = pdev->dev.platform_data;
+	subdev_count = config->subdev_count;
+	subdevdata = config->subdevinfo;
+	vpif_obj.sd = kmalloc(sizeof(struct v4l2_subdev *) * subdev_count,
+								GFP_KERNEL);
+	if (vpif_obj.sd == NULL) {
+		vpif_err("unable to allocate memory for subdevice pointers\n");
+		err = -ENOMEM;
+		goto probe_out;
+	}
+
+	for (i = 0; i < subdev_count; i++) {
+		vpif_obj.sd[i] = v4l2_i2c_new_probed_subdev(&vpif_obj.v4l2_dev,
+						i2c_adap, subdevdata[i].name,
+						subdevdata[i].name,
+						&subdevdata[i].addr);
+		if (!vpif_obj.sd[i]) {
+			vpif_err("Error registering v4l2 subdevice\n");
+			goto probe_subdev_out;
+		}
+
+		if (vpif_obj.sd[i])
+			vpif_obj.sd[i]->grp_id = 1 << i;
+	}
+
+	return 0;
+
+probe_subdev_out:
+	kfree(vpif_obj.sd);
+probe_out:
+	for (k = 0; k < j; k++) {
+		ch = vpif_obj.dev[k];
+		video_unregister_device(ch->video_dev);
+		video_device_release(ch->video_dev);
+		ch->video_dev = NULL;
+	}
+vpif_int_err:
+	v4l2_device_unregister(&vpif_obj.v4l2_dev);
+	vpif_err("VPIF IRQ request failed\n");
+	for (q = k; k >= 0; k--) {
+		for (m = i; m >= res->start; m--)
+			free_irq(m, (void *)(&vpif_obj.dev[k]->channel_id));
+		res = platform_get_resource(pdev, IORESOURCE_IRQ, k-1);
+		m = res->end;
+	}
+video_dev_alloc_exit:
+	iounmap(vpif_base);
+resource_exit:
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(res->start, res->end - res->start + 1);
+
+	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);
+
+	/* 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);
+
+		ch->video_dev = NULL;
+	}
+
+	return 0;
+}
+
+static struct platform_driver vpif_driver = {
+	.driver	= {
+			.name	= "vpif_display",
+			.owner	= THIS_MODULE,
+	},
+	.probe	= vpif_probe,
+	.remove	= vpif_remove,
+};
+
+static __init int vpif_init(void)
+{
+	return platform_driver_register(&vpif_driver);
+}
+
+/*
+ * vpif_cleanup: This function un-registers device and driver to the kernel,
+ * frees requested irq handler and de-allocates memory allocated for channel
+ * objects.
+ */
+static void vpif_cleanup(void)
+{
+	struct platform_device *pdev;
+	struct resource *res;
+	int irq_num;
+	int i = 0;
+
+	pdev = container_of(vpif_dev, struct platform_device, dev);
+
+	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, i))) {
+		for (irq_num = res->start; irq_num <= res->end; irq_num++)
+			free_irq(irq_num,
+				 (void *)(&vpif_obj.dev[i]->channel_id));
+		i++;
+	}
+
+	iounmap(vpif_base);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(res->start, res->end - res->start + 1);
+	platform_driver_unregister(&vpif_driver);
+	kfree(vpif_obj.sd);
+	for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++)
+		kfree(vpif_obj.dev[i]);
+}
+
+module_init(vpif_init);
+module_exit(vpif_cleanup);

drivers/media/video/davinci/vpif_display.h

+/*
+ * DM646x display header file
+ *
+ * Copyright (C) 2009 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 .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.
+ */
+
+#ifndef DAVINCIHD_DISPLAY_H
+#define DAVINCIHD_DISPLAY_H
+
+/* Header files */
+#include <linux/videodev2.h>
+#include <linux/version.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
+#include <media/videobuf-core.h>
+#include <media/videobuf-dma-contig.h>
+
+#include "vpif.h"
+
+/* Macros */
+#define VPIF_MAJOR_RELEASE	(0)
+#define VPIF_MINOR_RELEASE	(0)
+#define VPIF_BUILD		(1)
+
+#define VPIF_DISPLAY_VERSION_CODE \
+	((VPIF_MAJOR_RELEASE << 16) | (VPIF_MINOR_RELEASE << 8) | VPIF_BUILD)
+
+#define VPIF_VALID_FIELD(field) \
+	(((V4L2_FIELD_ANY == field) || (V4L2_FIELD_NONE == field)) || \
+	(((V4L2_FIELD_INTERLACED == field) || (V4L2_FIELD_SEQ_TB == field)) || \
+	(V4L2_FIELD_SEQ_BT == field)))
+
+#define VPIF_DISPLAY_MAX_DEVICES	(2)
+#define VPIF_SLICED_BUF_SIZE		(256)
+#define VPIF_SLICED_MAX_SERVICES	(3)
+#define VPIF_VIDEO_INDEX		(0)
+#define VPIF_VBI_INDEX			(1)
+#define VPIF_HBI_INDEX			(2)
+
+/* Setting it to 1 as HBI/VBI support yet to be added , else 3*/
+#define VPIF_NUMOBJECTS	(1)
+
+/* Macros */
+#define ISALIGNED(a)    (0 == ((a) & 7))
+
+/* enumerated data types */
+/* Enumerated data type to give id to each device per channel */
+enum vpif_channel_id {
+	VPIF_CHANNEL2_VIDEO = 0,	/* Channel2 Video */
+	VPIF_CHANNEL3_VIDEO,		/* Channel3 Video */
+};
+
+/* structures */
+
+struct video_obj {
+	enum v4l2_field buf_field;
+	u32 latest_only;		/* indicate whether to return
+					 * most recent displayed frame only */
+	v4l2_std_id stdid;		/* Currently selected or default
+					 * standard */
+	u32 output_id;			/* Current output id */
+};
+
+struct vbi_obj {
+	int num_services;
+	struct vpif_vbi_params vbiparams;	/* vpif parameters for the raw
+						 * vbi data */
+};
+
+struct common_obj {
+	/* Buffer specific parameters */
+	u8 *fbuffers[VIDEO_MAX_FRAME];		/* List of buffer pointers for
+						 * storing frames */
+	u32 numbuffers;				/* number of buffers */
+	struct videobuf_buffer *cur_frm;	/* Pointer pointing to current
+						 * videobuf_buffer */
+	struct videobuf_buffer *next_frm;	/* Pointer pointing to next
+						 * videobuf_buffer */
+	enum v4l2_memory memory;		/* This field keeps track of
+						 * type of buffer exchange
+						 * method user has selected */
+	struct v4l2_format fmt;			/* Used to store the format */
+	struct videobuf_queue buffer_queue;	/* Buffer queue used in
+						 * video-buf */
+	struct list_head dma_queue;		/* Queue of filled frames */
+	spinlock_t irqlock;			/* Used in video-buf */
+
+	/* channel specific parameters */
+	struct mutex lock;			/* lock used to access this
+						 * structure */
+	u32 io_usrs;				/* number of users performing
+						 * IO */
+	u8 started;				/* Indicates whether streaming
+						 * started */
+	u32 ytop_off;				/* offset of Y top from the
+						 * starting of the buffer */
+	u32 ybtm_off;				/* offset of Y bottom from the
+						 * starting of the buffer */
+	u32 ctop_off;				/* offset of C top from the
+						 * starting of the buffer */
+	u32 cbtm_off;				/* offset of C bottom from the
+						 * starting of the buffer */
+	/* Function pointer to set the addresses */
+	void (*set_addr) (unsigned long, unsigned long,
+				unsigned long, unsigned long);
+	u32 height;
+	u32 width;
+};
+
+struct channel_obj {
+	/* V4l2 specific parameters */
+	struct video_device *video_dev;	/* Identifies video device for
+					 * this channel */
+	struct v4l2_prio_state prio;	/* Used to keep track of state of
+					 * the priority */
+	atomic_t usrs;			/* number of open instances of
+					 * the channel */
+	u32 field_id;			/* Indicates id of the field
+					 * which is being displayed */
+	u8 initialized;			/* flag to indicate whether
+					 * encoder is initialized */
+
+	enum vpif_channel_id channel_id;/* Identifies channel */
+	struct vpif_params vpifparams;
+	struct common_obj common[VPIF_NUMOBJECTS];
+	struct video_obj video;
+	struct vbi_obj vbi;
+};
+
+/* File handle structure */
+struct vpif_fh {
+	struct channel_obj *channel;	/* pointer to channel object for
+					 * opened device */
+	u8 io_allowed[VPIF_NUMOBJECTS];	/* Indicates whether this file handle
+					 * is doing IO */
+	enum v4l2_priority prio;	/* Used to keep track priority of
+					 * this instance */
+	u8 initialized;			/* Used to keep track of whether this
+					 * file handle has initialized
+					 * channel or not */
+};
+
+/* vpif device structure */
+struct vpif_device {
+	struct v4l2_device v4l2_dev;
+	struct channel_obj *dev[VPIF_DISPLAY_NUM_CHANNELS];
+	struct v4l2_subdev **sd;
+
+};
+
+struct vpif_config_params {
+	u32 min_bufsize[VPIF_DISPLAY_NUM_CHANNELS];
+	u32 channel_bufsize[VPIF_DISPLAY_NUM_CHANNELS];
+	u8 numbuffers[VPIF_DISPLAY_NUM_CHANNELS];
+	u8 min_numbuffers;
+};
+
+/* Struct which keeps track of the line numbers for the sliced vbi service */
+struct vpif_service_line {
+	u16 service_id;
+	u16 service_line[2];
+	u16 enc_service_id;
+	u8 bytestowrite;
+};
+
+#endif				/* DAVINCIHD_DISPLAY_H */