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>

1 files changed, 1664 insertions, 0 deletions

diff --git a/drivers/media/video/davinci/vpif_display.c b/drivers/media/video/davinci/vpif_display.c
new file mode 100644
index 000000000000..5e2b86b3fa61
--- /dev/null
+++ b/drivers/media/video/davinci/vpif_display.c
@@ -0,0 +1,1664 @@
+/*
+ * 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);