/*
   em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
                    video capture devices

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
                      Markus Rechberger <mrechberger@gmail.com>
                      Mauro Carvalho Chehab <mchehab@infradead.org>
                      Sascha Sommer <saschasommer@freenet.de>
   Copyright (C) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>

        Some parts based on SN9C10x PC Camera Controllers GPL driver made
                by Luca Risolia <luca.risolia@studio.unibo.it>

   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; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#include "em28xx.h"
#include "em28xx-v4l.h"
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/v4l2-clk.h>
#include <media/msp3400.h>
#include <media/tuner.h>

#define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
                      "Markus Rechberger <mrechberger@gmail.com>, " \
                      "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
                      "Sascha Sommer <saschasommer@freenet.de>"

static unsigned int isoc_debug;
module_param(isoc_debug, int, 0644);
MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");

static unsigned int disable_vbi;
module_param(disable_vbi, int, 0644);
MODULE_PARM_DESC(disable_vbi, "disable vbi support");

static int alt;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");

#define em28xx_videodbg(fmt, arg...) do {\
        if (video_debug) \
                printk(KERN_INFO "%s %s :"fmt, \
                         dev->name, __func__ , ##arg); } while (0)

#define em28xx_isocdbg(fmt, arg...) \
do {\
        if (isoc_debug) { \
                printk(KERN_INFO "%s %s :"fmt, \
                         dev->name, __func__ , ##arg); \
        } \
  } while (0)

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC " - v4l2 interface");
MODULE_LICENSE("GPL");
MODULE_VERSION(EM28XX_VERSION);

#define EM25XX_FRMDATAHDR_BYTE1                 0x02
#define EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE     0x20
#define EM25XX_FRMDATAHDR_BYTE2_FRAME_END       0x02
#define EM25XX_FRMDATAHDR_BYTE2_FRAME_ID        0x01
#define EM25XX_FRMDATAHDR_BYTE2_MASK    (EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE | \
                                         EM25XX_FRMDATAHDR_BYTE2_FRAME_END |   \
                                         EM25XX_FRMDATAHDR_BYTE2_FRAME_ID)

static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };

module_param_array(video_nr, int, NULL, 0444);
module_param_array(vbi_nr, int, NULL, 0444);
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(video_nr, "video device numbers");
MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
MODULE_PARM_DESC(radio_nr, "radio device numbers");

static unsigned int video_debug;
module_param(video_debug, int, 0644);
MODULE_PARM_DESC(video_debug, "enable debug messages [video]");

/* supported video standards */
static struct em28xx_fmt format[] = {
        {
                .name     = "16 bpp YUY2, 4:2:2, packed",
                .fourcc   = V4L2_PIX_FMT_YUYV,
                .depth    = 16,
                .reg      = EM28XX_OUTFMT_YUV422_Y0UY1V,
        }, {
                .name     = "16 bpp RGB 565, LE",
                .fourcc   = V4L2_PIX_FMT_RGB565,
                .depth    = 16,
                .reg      = EM28XX_OUTFMT_RGB_16_656,
        }, {
                .name     = "8 bpp Bayer BGBG..GRGR",
                .fourcc   = V4L2_PIX_FMT_SBGGR8,
                .depth    = 8,
                .reg      = EM28XX_OUTFMT_RGB_8_BGBG,
        }, {
                .name     = "8 bpp Bayer GRGR..BGBG",
                .fourcc   = V4L2_PIX_FMT_SGRBG8,
                .depth    = 8,
                .reg      = EM28XX_OUTFMT_RGB_8_GRGR,
        }, {
                .name     = "8 bpp Bayer GBGB..RGRG",
                .fourcc   = V4L2_PIX_FMT_SGBRG8,
                .depth    = 8,
                .reg      = EM28XX_OUTFMT_RGB_8_GBGB,
        }, {
                .name     = "12 bpp YUV411",
                .fourcc   = V4L2_PIX_FMT_YUV411P,
                .depth    = 12,
                .reg      = EM28XX_OUTFMT_YUV411,
        },
};

/*FIXME: maxw should be dependent of alt mode */
static inline unsigned int norm_maxw(struct em28xx *dev)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        if (dev->board.is_webcam)
                return v4l2->sensor_xres;

        if (dev->board.max_range_640_480)
                return 640;

        return 720;
}

static inline unsigned int norm_maxh(struct em28xx *dev)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        if (dev->board.is_webcam)
                return v4l2->sensor_yres;

        if (dev->board.max_range_640_480)
                return 480;

        return (v4l2->norm & V4L2_STD_625_50) ? 576 : 480;
}

static int em28xx_vbi_supported(struct em28xx *dev)
{
        /* Modprobe option to manually disable */
        if (disable_vbi == 1)
                return 0;

        if (dev->board.is_webcam)
                return 0;

        /* FIXME: check subdevices for VBI support */

        if (dev->chip_id == CHIP_ID_EM2860 ||
            dev->chip_id == CHIP_ID_EM2883)
                return 1;

        /* Version of em28xx that does not support VBI */
        return 0;
}

/*
 * em28xx_wake_i2c()
 * configure i2c attached devices
 */
static void em28xx_wake_i2c(struct em28xx *dev)
{
        struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;

        v4l2_device_call_all(v4l2_dev, 0, core,  reset, 0);
        v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
                             INPUT(dev->ctl_input)->vmux, 0, 0);
        v4l2_device_call_all(v4l2_dev, 0, video, s_stream, 0);
}

static int em28xx_colorlevels_set_default(struct em28xx *dev)
{
        em28xx_write_reg(dev, EM28XX_R20_YGAIN, CONTRAST_DEFAULT);
        em28xx_write_reg(dev, EM28XX_R21_YOFFSET, BRIGHTNESS_DEFAULT);
        em28xx_write_reg(dev, EM28XX_R22_UVGAIN, SATURATION_DEFAULT);
        em28xx_write_reg(dev, EM28XX_R23_UOFFSET, BLUE_BALANCE_DEFAULT);
        em28xx_write_reg(dev, EM28XX_R24_VOFFSET, RED_BALANCE_DEFAULT);
        em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, SHARPNESS_DEFAULT);

        em28xx_write_reg(dev, EM28XX_R14_GAMMA, 0x20);
        em28xx_write_reg(dev, EM28XX_R15_RGAIN, 0x20);
        em28xx_write_reg(dev, EM28XX_R16_GGAIN, 0x20);
        em28xx_write_reg(dev, EM28XX_R17_BGAIN, 0x20);
        em28xx_write_reg(dev, EM28XX_R18_ROFFSET, 0x00);
        em28xx_write_reg(dev, EM28XX_R19_GOFFSET, 0x00);
        return em28xx_write_reg(dev, EM28XX_R1A_BOFFSET, 0x00);
}

static int em28xx_set_outfmt(struct em28xx *dev)
{
        int ret;
        u8 fmt, vinctrl;
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        fmt = v4l2->format->reg;
        if (!dev->is_em25xx)
                fmt |= 0x20;
        /*
         * NOTE: it's not clear if this is really needed !
         * The datasheets say bit 5 is a reserved bit and devices seem to work
         * fine without it. But the Windows driver sets it for em2710/50+em28xx
         * devices and we've always been setting it, too.
         *
         * em2765 (em25xx, em276x/7x/8x) devices do NOT work with this bit set,
         * it's likely used for an additional (compressed ?) format there.
         */
        ret = em28xx_write_reg(dev, EM28XX_R27_OUTFMT, fmt);
        if (ret < 0)
                return ret;

        ret = em28xx_write_reg(dev, EM28XX_R10_VINMODE, v4l2->vinmode);
        if (ret < 0)
                return ret;

        vinctrl = v4l2->vinctl;
        if (em28xx_vbi_supported(dev) == 1) {
                vinctrl |= EM28XX_VINCTRL_VBI_RAW;
                em28xx_write_reg(dev, EM28XX_R34_VBI_START_H, 0x00);
                em28xx_write_reg(dev, EM28XX_R36_VBI_WIDTH, v4l2->vbi_width/4);
                em28xx_write_reg(dev, EM28XX_R37_VBI_HEIGHT, v4l2->vbi_height);
                if (v4l2->norm & V4L2_STD_525_60) {
                        /* NTSC */
                        em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x09);
                } else if (v4l2->norm & V4L2_STD_625_50) {
                        /* PAL */
                        em28xx_write_reg(dev, EM28XX_R35_VBI_START_V, 0x07);
                }
        }

        return em28xx_write_reg(dev, EM28XX_R11_VINCTRL, vinctrl);
}

static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
                                  u8 ymin, u8 ymax)
{
        em28xx_videodbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
                        xmin, ymin, xmax, ymax);

        em28xx_write_regs(dev, EM28XX_R28_XMIN, &xmin, 1);
        em28xx_write_regs(dev, EM28XX_R29_XMAX, &xmax, 1);
        em28xx_write_regs(dev, EM28XX_R2A_YMIN, &ymin, 1);
        return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
}

static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
                                    u16 width, u16 height)
{
        u8 cwidth = width >> 2;
        u8 cheight = height >> 2;
        u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
        /* NOTE: size limit: 2047x1023 = 2MPix */

        em28xx_videodbg("capture area set to (%d,%d): %dx%d\n",
                        hstart, vstart,
                       ((overflow & 2) << 9 | cwidth << 2),
                       ((overflow & 1) << 10 | cheight << 2));

        em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
        em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
        em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
        em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
        em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);

        /* FIXME: function/meaning of these registers ? */
        /* FIXME: align width+height to multiples of 4 ?! */
        if (dev->is_em25xx) {
                em28xx_write_reg(dev, 0x34, width >> 4);
                em28xx_write_reg(dev, 0x35, height >> 4);
        }
}

static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
{
        u8 mode = 0x00;
        /* the em2800 scaler only supports scaling down to 50% */

        if (dev->board.is_em2800) {
                mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
        } else {
                u8 buf[2];

                buf[0] = h;
                buf[1] = h >> 8;
                em28xx_write_regs(dev, EM28XX_R30_HSCALELOW, (char *)buf, 2);

                buf[0] = v;
                buf[1] = v >> 8;
                em28xx_write_regs(dev, EM28XX_R32_VSCALELOW, (char *)buf, 2);
                /* it seems that both H and V scalers must be active
                   to work correctly */
                mode = (h || v) ? 0x30 : 0x00;
        }
        return em28xx_write_reg(dev, EM28XX_R26_COMPR, mode);
}

/* FIXME: this only function read values from dev */
static int em28xx_resolution_set(struct em28xx *dev)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        int width = norm_maxw(dev);
        int height = norm_maxh(dev);

        /* Properly setup VBI */
        v4l2->vbi_width = 720;
        if (v4l2->norm & V4L2_STD_525_60)
                v4l2->vbi_height = 12;
        else
                v4l2->vbi_height = 18;

        em28xx_set_outfmt(dev);

        em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);

        /* If we don't set the start position to 2 in VBI mode, we end up
           with line 20/21 being YUYV encoded instead of being in 8-bit
           greyscale.  The core of the issue is that line 21 (and line 23 for
           PAL WSS) are inside of active video region, and as a result they
           get the pixelformatting associated with that area.  So by cropping
           it out, we end up with the same format as the rest of the VBI
           region */
        if (em28xx_vbi_supported(dev) == 1)
                em28xx_capture_area_set(dev, 0, 2, width, height);
        else
                em28xx_capture_area_set(dev, 0, 0, width, height);

        return em28xx_scaler_set(dev, v4l2->hscale, v4l2->vscale);
}

/* Set USB alternate setting for analog video */
static int em28xx_set_alternate(struct em28xx *dev)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        int errCode;
        int i;
        unsigned int min_pkt_size = v4l2->width * 2 + 4;

        /* NOTE: for isoc transfers, only alt settings > 0 are allowed
                 bulk transfers seem to work only with alt=0 ! */
        dev->alt = 0;
        if ((alt > 0) && (alt < dev->num_alt)) {
                em28xx_videodbg("alternate forced to %d\n", dev->alt);
                dev->alt = alt;
                goto set_alt;
        }
        if (dev->analog_xfer_bulk)
                goto set_alt;

        /* When image size is bigger than a certain value,
           the frame size should be increased, otherwise, only
           green screen will be received.
         */
        if (v4l2->width * 2 * v4l2->height > 720 * 240 * 2)
                min_pkt_size *= 2;

        for (i = 0; i < dev->num_alt; i++) {
                /* stop when the selected alt setting offers enough bandwidth */
                if (dev->alt_max_pkt_size_isoc[i] >= min_pkt_size) {
                        dev->alt = i;
                        break;
                /* otherwise make sure that we end up with the maximum bandwidth
                   because the min_pkt_size equation might be wrong...
                */
                } else if (dev->alt_max_pkt_size_isoc[i] >
                           dev->alt_max_pkt_size_isoc[dev->alt])
                        dev->alt = i;
        }

set_alt:
        /* NOTE: for bulk transfers, we need to call usb_set_interface()
         * even if the previous settings were the same. Otherwise streaming
         * fails with all urbs having status = -EOVERFLOW ! */
        if (dev->analog_xfer_bulk) {
                dev->max_pkt_size = 512; /* USB 2.0 spec */
                dev->packet_multiplier = EM28XX_BULK_PACKET_MULTIPLIER;
        } else { /* isoc */
                em28xx_videodbg("minimum isoc packet size: %u (alt=%d)\n",
                                min_pkt_size, dev->alt);
                dev->max_pkt_size =
                                  dev->alt_max_pkt_size_isoc[dev->alt];
                dev->packet_multiplier = EM28XX_NUM_ISOC_PACKETS;
        }
        em28xx_videodbg("setting alternate %d with wMaxPacketSize=%u\n",
                        dev->alt, dev->max_pkt_size);
        errCode = usb_set_interface(dev->udev, dev->ifnum, dev->alt);
        if (errCode < 0) {
                em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
                              dev->alt, errCode);
                return errCode;
        }
        return 0;
}

/* ------------------------------------------------------------------
        DMA and thread functions
   ------------------------------------------------------------------*/

/*
 * Finish the current buffer
 */
static inline void finish_buffer(struct em28xx *dev,
                                 struct em28xx_buffer *buf)
{
        em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->top_field);

        buf->vb.v4l2_buf.sequence = dev->v4l2->field_count++;
        if (dev->v4l2->progressive)
                buf->vb.v4l2_buf.field = V4L2_FIELD_NONE;
        else
                buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED;
        v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp);

        vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
}

/*
 * Copy picture data from USB buffer to videobuf buffer
 */
static void em28xx_copy_video(struct em28xx *dev,
                              struct em28xx_buffer *buf,
                              unsigned char *usb_buf,
                              unsigned long len)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        void *fieldstart, *startwrite, *startread;
        int  linesdone, currlinedone, offset, lencopy, remain;
        int bytesperline = v4l2->width << 1;

        if (buf->pos + len > buf->length)
                len = buf->length - buf->pos;

        startread = usb_buf;
        remain = len;

        if (v4l2->progressive || buf->top_field)
                fieldstart = buf->vb_buf;
        else /* interlaced mode, even nr. of lines */
                fieldstart = buf->vb_buf + bytesperline;

        linesdone = buf->pos / bytesperline;
        currlinedone = buf->pos % bytesperline;

        if (v4l2->progressive)
                offset = linesdone * bytesperline + currlinedone;
        else
                offset = linesdone * bytesperline * 2 + currlinedone;

        startwrite = fieldstart + offset;
        lencopy = bytesperline - currlinedone;
        lencopy = lencopy > remain ? remain : lencopy;

        if ((char *)startwrite + lencopy > (char *)buf->vb_buf + buf->length) {
                em28xx_isocdbg("Overflow of %zu bytes past buffer end (1)\n",
                               ((char *)startwrite + lencopy) -
                              ((char *)buf->vb_buf + buf->length));
                remain = (char *)buf->vb_buf + buf->length -
                         (char *)startwrite;
                lencopy = remain;
        }
        if (lencopy <= 0)
                return;
        memcpy(startwrite, startread, lencopy);

        remain -= lencopy;

        while (remain > 0) {
                if (v4l2->progressive)
                        startwrite += lencopy;
                else
                        startwrite += lencopy + bytesperline;
                startread += lencopy;
                if (bytesperline > remain)
                        lencopy = remain;
                else
                        lencopy = bytesperline;

                if ((char *)startwrite + lencopy > (char *)buf->vb_buf +
                    buf->length) {
                        em28xx_isocdbg("Overflow of %zu bytes past buffer end"
                                       "(2)\n",
                                       ((char *)startwrite + lencopy) -
                                       ((char *)buf->vb_buf + buf->length));
                        lencopy = remain = (char *)buf->vb_buf + buf->length -
                                (char *)startwrite;
                }
                if (lencopy <= 0)
                        break;

                memcpy(startwrite, startread, lencopy);

                remain -= lencopy;
        }

        buf->pos += len;
}

/*
 * Copy VBI data from USB buffer to videobuf buffer
 */
static void em28xx_copy_vbi(struct em28xx *dev,
                            struct em28xx_buffer *buf,
                            unsigned char *usb_buf,
                            unsigned long len)
{
        unsigned int offset;

        if (buf->pos + len > buf->length)
                len = buf->length - buf->pos;

        offset = buf->pos;
        /* Make sure the bottom field populates the second half of the frame */
        if (buf->top_field == 0)
                offset += dev->v4l2->vbi_width * dev->v4l2->vbi_height;

        memcpy(buf->vb_buf + offset, usb_buf, len);
        buf->pos += len;
}

static inline void print_err_status(struct em28xx *dev,
                                    int packet, int status)
{
        char *errmsg = "Unknown";

        switch (status) {
        case -ENOENT:
                errmsg = "unlinked synchronuously";
                break;
        case -ECONNRESET:
                errmsg = "unlinked asynchronuously";
                break;
        case -ENOSR:
                errmsg = "Buffer error (overrun)";
                break;
        case -EPIPE:
                errmsg = "Stalled (device not responding)";
                break;
        case -EOVERFLOW:
                errmsg = "Babble (bad cable?)";
                break;
        case -EPROTO:
                errmsg = "Bit-stuff error (bad cable?)";
                break;
        case -EILSEQ:
                errmsg = "CRC/Timeout (could be anything)";
                break;
        case -ETIME:
                errmsg = "Device does not respond";
                break;
        }
        if (packet < 0) {
                em28xx_isocdbg("URB status %d [%s].\n", status, errmsg);
        } else {
                em28xx_isocdbg("URB packet %d, status %d [%s].\n",
                               packet, status, errmsg);
        }
}

/*
 * get the next available buffer from dma queue
 */
static inline struct em28xx_buffer *get_next_buf(struct em28xx *dev,
                                                 struct em28xx_dmaqueue *dma_q)
{
        struct em28xx_buffer *buf;

        if (list_empty(&dma_q->active)) {
                em28xx_isocdbg("No active queue to serve\n");
                return NULL;
        }

        /* Get the next buffer */
        buf = list_entry(dma_q->active.next, struct em28xx_buffer, list);
        /* Cleans up buffer - Useful for testing for frame/URB loss */
        list_del(&buf->list);
        buf->pos = 0;
        buf->vb_buf = buf->mem;

        return buf;
}

/*
 * Finish the current buffer if completed and prepare for the next field
 */
static struct em28xx_buffer *
finish_field_prepare_next(struct em28xx *dev,
                          struct em28xx_buffer *buf,
                          struct em28xx_dmaqueue *dma_q)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        if (v4l2->progressive || v4l2->top_field) { /* Brand new frame */
                if (buf != NULL)
                        finish_buffer(dev, buf);
                buf = get_next_buf(dev, dma_q);
        }
        if (buf != NULL) {
                buf->top_field = v4l2->top_field;
                buf->pos = 0;
        }

        return buf;
}

/*
 * Process data packet according to the em2710/em2750/em28xx frame data format
 */
static inline void process_frame_data_em28xx(struct em28xx *dev,
                                             unsigned char *data_pkt,
                                             unsigned int  data_len)
{
        struct em28xx_v4l2      *v4l2 = dev->v4l2;
        struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
        struct em28xx_buffer    *vbi_buf = dev->usb_ctl.vbi_buf;
        struct em28xx_dmaqueue  *dma_q = &dev->vidq;
        struct em28xx_dmaqueue  *vbi_dma_q = &dev->vbiq;

        /* capture type 0 = vbi start
           capture type 1 = vbi in progress
           capture type 2 = video start
           capture type 3 = video in progress */
        if (data_len >= 4) {
                /* NOTE: Headers are always 4 bytes and
                 * never split across packets */
                if (data_pkt[0] == 0x88 && data_pkt[1] == 0x88 &&
                    data_pkt[2] == 0x88 && data_pkt[3] == 0x88) {
                        /* Continuation */
                        data_pkt += 4;
                        data_len -= 4;
                } else if (data_pkt[0] == 0x33 && data_pkt[1] == 0x95) {
                        /* Field start (VBI mode) */
                        v4l2->capture_type = 0;
                        v4l2->vbi_read = 0;
                        em28xx_isocdbg("VBI START HEADER !!!\n");
                        v4l2->top_field = !(data_pkt[2] & 1);
                        data_pkt += 4;
                        data_len -= 4;
                } else if (data_pkt[0] == 0x22 && data_pkt[1] == 0x5a) {
                        /* Field start (VBI disabled) */
                        v4l2->capture_type = 2;
                        em28xx_isocdbg("VIDEO START HEADER !!!\n");
                        v4l2->top_field = !(data_pkt[2] & 1);
                        data_pkt += 4;
                        data_len -= 4;
                }
        }
        /* NOTE: With bulk transfers, intermediate data packets
         * have no continuation header */

        if (v4l2->capture_type == 0) {
                vbi_buf = finish_field_prepare_next(dev, vbi_buf, vbi_dma_q);
                dev->usb_ctl.vbi_buf = vbi_buf;
                v4l2->capture_type = 1;
        }

        if (v4l2->capture_type == 1) {
                int vbi_size = v4l2->vbi_width * v4l2->vbi_height;
                int vbi_data_len = ((v4l2->vbi_read + data_len) > vbi_size) ?
                                   (vbi_size - v4l2->vbi_read) : data_len;

                /* Copy VBI data */
                if (vbi_buf != NULL)
                        em28xx_copy_vbi(dev, vbi_buf, data_pkt, vbi_data_len);
                v4l2->vbi_read += vbi_data_len;

                if (vbi_data_len < data_len) {
                        /* Continue with copying video data */
                        v4l2->capture_type = 2;
                        data_pkt += vbi_data_len;
                        data_len -= vbi_data_len;
                }
        }

        if (v4l2->capture_type == 2) {
                buf = finish_field_prepare_next(dev, buf, dma_q);
                dev->usb_ctl.vid_buf = buf;
                v4l2->capture_type = 3;
        }

        if (v4l2->capture_type == 3 && buf != NULL && data_len > 0)
                em28xx_copy_video(dev, buf, data_pkt, data_len);
}

/*
 * Process data packet according to the em25xx/em276x/7x/8x frame data format
 */
static inline void process_frame_data_em25xx(struct em28xx *dev,
                                             unsigned char *data_pkt,
                                             unsigned int  data_len)
{
        struct em28xx_buffer    *buf = dev->usb_ctl.vid_buf;
        struct em28xx_dmaqueue  *dmaq = &dev->vidq;
        struct em28xx_v4l2      *v4l2 = dev->v4l2;
        bool frame_end = false;

        /* Check for header */
        /* NOTE: at least with bulk transfers, only the first packet
         * has a header and has always set the FRAME_END bit         */
        if (data_len >= 2) {    /* em25xx header is only 2 bytes long */
                if ((data_pkt[0] == EM25XX_FRMDATAHDR_BYTE1) &&
                    ((data_pkt[1] & ~EM25XX_FRMDATAHDR_BYTE2_MASK) == 0x00)) {
                        v4l2->top_field = !(data_pkt[1] &
                                           EM25XX_FRMDATAHDR_BYTE2_FRAME_ID);
                        frame_end = data_pkt[1] &
                                    EM25XX_FRMDATAHDR_BYTE2_FRAME_END;
                        data_pkt += 2;
                        data_len -= 2;
                }

                /* Finish field and prepare next (BULK only) */
                if (dev->analog_xfer_bulk && frame_end) {
                        buf = finish_field_prepare_next(dev, buf, dmaq);
                        dev->usb_ctl.vid_buf = buf;
                }
                /* NOTE: in ISOC mode when a new frame starts and buf==NULL,
                 * we COULD already prepare a buffer here to avoid skipping the
                 * first frame.
                 */
        }

        /* Copy data */
        if (buf != NULL && data_len > 0)
                em28xx_copy_video(dev, buf, data_pkt, data_len);

        /* Finish frame (ISOC only) => avoids lag of 1 frame */
        if (!dev->analog_xfer_bulk && frame_end) {
                buf = finish_field_prepare_next(dev, buf, dmaq);
                dev->usb_ctl.vid_buf = buf;
        }

        /* NOTE: Tested with USB bulk transfers only !
         * The wording in the datasheet suggests that isoc might work different.
         * The current code assumes that with isoc transfers each packet has a
         * header like with the other em28xx devices.
         */
        /* NOTE: Support for interlaced mode is pure theory. It has not been
         * tested and it is unknown if these devices actually support it. */
        /* NOTE: No VBI support yet (these chips likely do not support VBI). */
}

/* Processes and copies the URB data content (video and VBI data) */
static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
{
        int xfer_bulk, num_packets, i;
        unsigned char *usb_data_pkt;
        unsigned int usb_data_len;

        if (!dev)
                return 0;

        if (dev->disconnected)
                return 0;

        if (urb->status < 0)
                print_err_status(dev, -1, urb->status);

        xfer_bulk = usb_pipebulk(urb->pipe);

        if (xfer_bulk) /* bulk */
                num_packets = 1;
        else /* isoc */
                num_packets = urb->number_of_packets;

        for (i = 0; i < num_packets; i++) {
                if (xfer_bulk) { /* bulk */
                        usb_data_len = urb->actual_length;

                        usb_data_pkt = urb->transfer_buffer;
                } else { /* isoc */
                        if (urb->iso_frame_desc[i].status < 0) {
                                print_err_status(dev, i,
                                                 urb->iso_frame_desc[i].status);
                                if (urb->iso_frame_desc[i].status != -EPROTO)
                                        continue;
                        }

                        usb_data_len = urb->iso_frame_desc[i].actual_length;
                        if (usb_data_len > dev->max_pkt_size) {
                                em28xx_isocdbg("packet bigger than packet size");
                                continue;
                        }

                        usb_data_pkt = urb->transfer_buffer +
                                       urb->iso_frame_desc[i].offset;
                }

                if (usb_data_len == 0) {
                        /* NOTE: happens very often with isoc transfers */
                        /* em28xx_usbdbg("packet %d is empty",i); - spammy */
                        continue;
                }

                if (dev->is_em25xx)
                        process_frame_data_em25xx(dev,
                                                  usb_data_pkt, usb_data_len);
                else
                        process_frame_data_em28xx(dev,
                                                  usb_data_pkt, usb_data_len);

        }
        return 1;
}

static int get_ressource(enum v4l2_buf_type f_type)
{
        switch (f_type) {
        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
                return EM28XX_RESOURCE_VIDEO;
        case V4L2_BUF_TYPE_VBI_CAPTURE:
                return EM28XX_RESOURCE_VBI;
        default:
                BUG();
                return 0;
        }
}

/* Usage lock check functions */
static int res_get(struct em28xx *dev, enum v4l2_buf_type f_type)
{
        int res_type = get_ressource(f_type);

        /* is it free? */
        if (dev->resources & res_type) {
                /* no, someone else uses it */
                return -EBUSY;
        }

        /* it's free, grab it */
        dev->resources |= res_type;
        em28xx_videodbg("res: get %d\n", res_type);
        return 0;
}

static void res_free(struct em28xx *dev, enum v4l2_buf_type f_type)
{
        int res_type = get_ressource(f_type);

        dev->resources &= ~res_type;
        em28xx_videodbg("res: put %d\n", res_type);
}

/* ------------------------------------------------------------------
        Videobuf2 operations
   ------------------------------------------------------------------*/

static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
                       unsigned int *nbuffers, unsigned int *nplanes,
                       unsigned int sizes[], void *alloc_ctxs[])
{
        struct em28xx *dev = vb2_get_drv_priv(vq);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        unsigned long size;

        if (fmt)
                size = fmt->fmt.pix.sizeimage;
        else
                size =
                    (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;

        if (size == 0)
                return -EINVAL;

        if (0 == *nbuffers)
                *nbuffers = 32;

        *nplanes = 1;
        sizes[0] = size;

        return 0;
}

static int
buffer_prepare(struct vb2_buffer *vb)
{
        struct em28xx        *dev = vb2_get_drv_priv(vb->vb2_queue);
        struct em28xx_v4l2   *v4l2 = dev->v4l2;
        struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
        unsigned long size;

        em28xx_videodbg("%s, field=%d\n", __func__, vb->v4l2_buf.field);

        size = (v4l2->width * v4l2->height * v4l2->format->depth + 7) >> 3;

        if (vb2_plane_size(vb, 0) < size) {
                em28xx_videodbg("%s data will not fit into plane (%lu < %lu)\n",
                                __func__, vb2_plane_size(vb, 0), size);
                return -EINVAL;
        }
        vb2_set_plane_payload(&buf->vb, 0, size);

        return 0;
}

int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
{
        struct em28xx *dev = vb2_get_drv_priv(vq);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        struct v4l2_frequency f;
        int rc = 0;

        em28xx_videodbg("%s\n", __func__);

        /* Make sure streaming is not already in progress for this type
           of filehandle (e.g. video, vbi) */
        rc = res_get(dev, vq->type);
        if (rc)
                return rc;

        if (v4l2->streaming_users == 0) {
                /* First active streaming user, so allocate all the URBs */

                /* Allocate the USB bandwidth */
                em28xx_set_alternate(dev);

                /* Needed, since GPIO might have disabled power of
                   some i2c device
                */
                em28xx_wake_i2c(dev);

                v4l2->capture_type = -1;
                rc = em28xx_init_usb_xfer(dev, EM28XX_ANALOG_MODE,
                                          dev->analog_xfer_bulk,
                                          EM28XX_NUM_BUFS,
                                          dev->max_pkt_size,
                                          dev->packet_multiplier,
                                          em28xx_urb_data_copy);
                if (rc < 0)
                        return rc;

                /*
                 * djh: it's not clear whether this code is still needed.  I'm
                 * leaving it in here for now entirely out of concern for
                 * backward compatibility (the old code did it)
                 */

                /* Ask tuner to go to analog or radio mode */
                memset(&f, 0, sizeof(f));
                f.frequency = v4l2->frequency;
                if (vq->owner && vq->owner->vdev->vfl_type == VFL_TYPE_RADIO)
                        f.type = V4L2_TUNER_RADIO;
                else
                        f.type = V4L2_TUNER_ANALOG_TV;
                v4l2_device_call_all(&v4l2->v4l2_dev,
                                     0, tuner, s_frequency, &f);
        }

        v4l2->streaming_users++;

        return rc;
}

static void em28xx_stop_streaming(struct vb2_queue *vq)
{
        struct em28xx *dev = vb2_get_drv_priv(vq);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        struct em28xx_dmaqueue *vidq = &dev->vidq;
        unsigned long flags = 0;

        em28xx_videodbg("%s\n", __func__);

        res_free(dev, vq->type);

        if (v4l2->streaming_users-- == 1) {
                /* Last active user, so shutdown all the URBS */
                em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
        }

        spin_lock_irqsave(&dev->slock, flags);
        if (dev->usb_ctl.vid_buf != NULL) {
                vb2_buffer_done(&dev->usb_ctl.vid_buf->vb, VB2_BUF_STATE_ERROR);
                dev->usb_ctl.vid_buf = NULL;

        }
        while (!list_empty(&vidq->active)) {
                struct em28xx_buffer *buf;

                buf = list_entry(vidq->active.next, struct em28xx_buffer, list);
                list_del(&buf->list);
                vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
        }
        spin_unlock_irqrestore(&dev->slock, flags);
}

void em28xx_stop_vbi_streaming(struct vb2_queue *vq)
{
        struct em28xx *dev = vb2_get_drv_priv(vq);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        struct em28xx_dmaqueue *vbiq = &dev->vbiq;
        unsigned long flags = 0;

        em28xx_videodbg("%s\n", __func__);

        res_free(dev, vq->type);

        if (v4l2->streaming_users-- == 1) {
                /* Last active user, so shutdown all the URBS */
                em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);
        }

        spin_lock_irqsave(&dev->slock, flags);
        if (dev->usb_ctl.vbi_buf != NULL) {
                vb2_buffer_done(&dev->usb_ctl.vbi_buf->vb, VB2_BUF_STATE_ERROR);
                dev->usb_ctl.vbi_buf = NULL;
        }
        while (!list_empty(&vbiq->active)) {
                struct em28xx_buffer *buf;

                buf = list_entry(vbiq->active.next, struct em28xx_buffer, list);
                list_del(&buf->list);
                vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
        }
        spin_unlock_irqrestore(&dev->slock, flags);
}

static void
buffer_queue(struct vb2_buffer *vb)
{
        struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
        struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
        struct em28xx_dmaqueue *vidq = &dev->vidq;
        unsigned long flags = 0;

        em28xx_videodbg("%s\n", __func__);
        buf->mem = vb2_plane_vaddr(vb, 0);
        buf->length = vb2_plane_size(vb, 0);

        spin_lock_irqsave(&dev->slock, flags);
        list_add_tail(&buf->list, &vidq->active);
        spin_unlock_irqrestore(&dev->slock, flags);
}

static struct vb2_ops em28xx_video_qops = {
        .queue_setup    = queue_setup,
        .buf_prepare    = buffer_prepare,
        .buf_queue      = buffer_queue,
        .start_streaming = em28xx_start_analog_streaming,
        .stop_streaming = em28xx_stop_streaming,
        .wait_prepare   = vb2_ops_wait_prepare,
        .wait_finish    = vb2_ops_wait_finish,
};

static int em28xx_vb2_setup(struct em28xx *dev)
{
        int rc;
        struct vb2_queue *q;
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        /* Setup Videobuf2 for Video capture */
        q = &v4l2->vb_vidq;
        q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->drv_priv = dev;
        q->buf_struct_size = sizeof(struct em28xx_buffer);
        q->ops = &em28xx_video_qops;
        q->mem_ops = &vb2_vmalloc_memops;

        rc = vb2_queue_init(q);
        if (rc < 0)
                return rc;

        /* Setup Videobuf2 for VBI capture */
        q = &v4l2->vb_vbiq;
        q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
        q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->drv_priv = dev;
        q->buf_struct_size = sizeof(struct em28xx_buffer);
        q->ops = &em28xx_vbi_qops;
        q->mem_ops = &vb2_vmalloc_memops;

        rc = vb2_queue_init(q);
        if (rc < 0)
                return rc;

        return 0;
}

/*********************  v4l2 interface  **************************************/

static void video_mux(struct em28xx *dev, int index)
{
        struct v4l2_device *v4l2_dev = &dev->v4l2->v4l2_dev;

        dev->ctl_input = index;
        dev->ctl_ainput = INPUT(index)->amux;
        dev->ctl_aoutput = INPUT(index)->aout;

        if (!dev->ctl_aoutput)
                dev->ctl_aoutput = EM28XX_AOUT_MASTER;

        v4l2_device_call_all(v4l2_dev, 0, video, s_routing,
                             INPUT(index)->vmux, 0, 0);

        if (dev->board.has_msp34xx) {
                if (dev->i2s_speed) {
                        v4l2_device_call_all(v4l2_dev, 0, audio,
                                             s_i2s_clock_freq, dev->i2s_speed);
                }
                /* Note: this is msp3400 specific */
                v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
                                     dev->ctl_ainput,
                                     MSP_OUTPUT(MSP_SC_IN_DSP_SCART1), 0);
        }

        if (dev->board.adecoder != EM28XX_NOADECODER) {
                v4l2_device_call_all(v4l2_dev, 0, audio, s_routing,
                                     dev->ctl_ainput, dev->ctl_aoutput, 0);
        }

        em28xx_audio_analog_set(dev);
}

static void em28xx_ctrl_notify(struct v4l2_ctrl *ctrl, void *priv)
{
        struct em28xx *dev = priv;

        /*
         * In the case of non-AC97 volume controls, we still need
         * to do some setups at em28xx, in order to mute/unmute
         * and to adjust audio volume. However, the value ranges
         * should be checked by the corresponding V4L subdriver.
         */
        switch (ctrl->id) {
        case V4L2_CID_AUDIO_MUTE:
                dev->mute = ctrl->val;
                em28xx_audio_analog_set(dev);
                break;
        case V4L2_CID_AUDIO_VOLUME:
                dev->volume = ctrl->val;
                em28xx_audio_analog_set(dev);
                break;
        }
}

static int em28xx_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct em28xx_v4l2 *v4l2 =
                  container_of(ctrl->handler, struct em28xx_v4l2, ctrl_handler);
        struct em28xx *dev = v4l2->dev;
        int ret = -EINVAL;

        switch (ctrl->id) {
        case V4L2_CID_AUDIO_MUTE:
                dev->mute = ctrl->val;
                ret = em28xx_audio_analog_set(dev);
                break;
        case V4L2_CID_AUDIO_VOLUME:
                dev->volume = ctrl->val;
                ret = em28xx_audio_analog_set(dev);
                break;
        case V4L2_CID_CONTRAST:
                ret = em28xx_write_reg(dev, EM28XX_R20_YGAIN, ctrl->val);
                break;
        case V4L2_CID_BRIGHTNESS:
                ret = em28xx_write_reg(dev, EM28XX_R21_YOFFSET, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                ret = em28xx_write_reg(dev, EM28XX_R22_UVGAIN, ctrl->val);
                break;
        case V4L2_CID_BLUE_BALANCE:
                ret = em28xx_write_reg(dev, EM28XX_R23_UOFFSET, ctrl->val);
                break;
        case V4L2_CID_RED_BALANCE:
                ret = em28xx_write_reg(dev, EM28XX_R24_VOFFSET, ctrl->val);
                break;
        case V4L2_CID_SHARPNESS:
                ret = em28xx_write_reg(dev, EM28XX_R25_SHARPNESS, ctrl->val);
                break;
        }

        return (ret < 0) ? ret : 0;
}

static const struct v4l2_ctrl_ops em28xx_ctrl_ops = {
        .s_ctrl = em28xx_s_ctrl,
};

static void size_to_scale(struct em28xx *dev,
                          unsigned int width, unsigned int height,
                        unsigned int *hscale, unsigned int *vscale)
{
        unsigned int          maxw = norm_maxw(dev);
        unsigned int          maxh = norm_maxh(dev);

        *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
        if (*hscale > EM28XX_HVSCALE_MAX)
                *hscale = EM28XX_HVSCALE_MAX;

        *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
        if (*vscale > EM28XX_HVSCALE_MAX)
                *vscale = EM28XX_HVSCALE_MAX;
}

static void scale_to_size(struct em28xx *dev,
                          unsigned int hscale, unsigned int vscale,
                          unsigned int *width, unsigned int *height)
{
        unsigned int          maxw = norm_maxw(dev);
        unsigned int          maxh = norm_maxh(dev);

        *width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
        *height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
}

/* ------------------------------------------------------------------
        IOCTL vidioc handling
   ------------------------------------------------------------------*/

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
                                struct v4l2_format *f)
{
        struct em28xx         *dev = video_drvdata(file);
        struct em28xx_v4l2    *v4l2 = dev->v4l2;

        f->fmt.pix.width = v4l2->width;
        f->fmt.pix.height = v4l2->height;
        f->fmt.pix.pixelformat = v4l2->format->fourcc;
        f->fmt.pix.bytesperline = (v4l2->width * v4l2->format->depth + 7) >> 3;
        f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * v4l2->height;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

        /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
        if (v4l2->progressive)
                f->fmt.pix.field = V4L2_FIELD_NONE;
        else
                f->fmt.pix.field = v4l2->interlaced_fieldmode ?
                           V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
        return 0;
}

static struct em28xx_fmt *format_by_fourcc(unsigned int fourcc)
{
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(format); i++)
                if (format[i].fourcc == fourcc)
                        return &format[i];

        return NULL;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
                                  struct v4l2_format *f)
{
        struct em28xx         *dev   = video_drvdata(file);
        struct em28xx_v4l2    *v4l2  = dev->v4l2;
        unsigned int          width  = f->fmt.pix.width;
        unsigned int          height = f->fmt.pix.height;
        unsigned int          maxw   = norm_maxw(dev);
        unsigned int          maxh   = norm_maxh(dev);
        unsigned int          hscale, vscale;
        struct em28xx_fmt     *fmt;

        fmt = format_by_fourcc(f->fmt.pix.pixelformat);
        if (!fmt) {
                em28xx_videodbg("Fourcc format (%08x) invalid.\n",
                                f->fmt.pix.pixelformat);
                return -EINVAL;
        }

        if (dev->board.is_em2800) {
                /* the em2800 can only scale down to 50% */
                height = height > (3 * maxh / 4) ? maxh : maxh / 2;
                width = width > (3 * maxw / 4) ? maxw : maxw / 2;
                /*
                 * MaxPacketSize for em2800 is too small to capture at full
                 * resolution use half of maxw as the scaler can only scale
                 * to 50%
                 */
                if (width == maxw && height == maxh)
                        width /= 2;
        } else {
                /* width must even because of the YUYV format
                   height must be even because of interlacing */
                v4l_bound_align_image(&width, 48, maxw, 1, &height, 32, maxh,
                                      1, 0);
        }

        size_to_scale(dev, width, height, &hscale, &vscale);
        scale_to_size(dev, hscale, vscale, &width, &height);

        f->fmt.pix.width = width;
        f->fmt.pix.height = height;
        f->fmt.pix.pixelformat = fmt->fourcc;
        f->fmt.pix.bytesperline = (width * fmt->depth + 7) >> 3;
        f->fmt.pix.sizeimage = f->fmt.pix.bytesperline * height;
        f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
        if (v4l2->progressive)
                f->fmt.pix.field = V4L2_FIELD_NONE;
        else
                f->fmt.pix.field = v4l2->interlaced_fieldmode ?
                           V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
        f->fmt.pix.priv = 0;

        return 0;
}

static int em28xx_set_video_format(struct em28xx *dev, unsigned int fourcc,
                                   unsigned width, unsigned height)
{
        struct em28xx_fmt     *fmt;
        struct em28xx_v4l2    *v4l2 = dev->v4l2;

        fmt = format_by_fourcc(fourcc);
        if (!fmt)
                return -EINVAL;

        v4l2->format = fmt;
        v4l2->width  = width;
        v4l2->height = height;

        /* set new image size */
        size_to_scale(dev, v4l2->width, v4l2->height,
                      &v4l2->hscale, &v4l2->vscale);

        em28xx_resolution_set(dev);

        return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
                                struct v4l2_format *f)
{
        struct em28xx *dev = video_drvdata(file);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        if (vb2_is_busy(&v4l2->vb_vidq))
                return -EBUSY;

        vidioc_try_fmt_vid_cap(file, priv, f);

        return em28xx_set_video_format(dev, f->fmt.pix.pixelformat,
                                f->fmt.pix.width, f->fmt.pix.height);
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
        struct em28xx *dev = video_drvdata(file);

        *norm = dev->v4l2->norm;

        return 0;
}

static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
{
        struct em28xx *dev = video_drvdata(file);

        v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, video, querystd, norm);

        return 0;
}

static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
{
        struct em28xx      *dev  = video_drvdata(file);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        struct v4l2_format f;

        if (norm == v4l2->norm)
                return 0;

        if (v4l2->streaming_users > 0)
                return -EBUSY;

        v4l2->norm = norm;

        /* Adjusts width/height, if needed */
        f.fmt.pix.width = 720;
        f.fmt.pix.height = (norm & V4L2_STD_525_60) ? 480 : 576;
        vidioc_try_fmt_vid_cap(file, priv, &f);

        /* set new image size */
        v4l2->width = f.fmt.pix.width;
        v4l2->height = f.fmt.pix.height;
        size_to_scale(dev, v4l2->width, v4l2->height,
                      &v4l2->hscale, &v4l2->vscale);

        em28xx_resolution_set(dev);
        v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);

        return 0;
}

static int vidioc_g_parm(struct file *file, void *priv,
                         struct v4l2_streamparm *p)
{
        struct em28xx      *dev  = video_drvdata(file);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        int rc = 0;

        p->parm.capture.readbuffers = EM28XX_MIN_BUF;
        if (dev->board.is_webcam)
                rc = v4l2_device_call_until_err(&v4l2->v4l2_dev, 0,
                                                video, g_parm, p);
        else
                v4l2_video_std_frame_period(v4l2->norm,
                                            &p->parm.capture.timeperframe);

        return rc;
}

static int vidioc_s_parm(struct file *file, void *priv,
                         struct v4l2_streamparm *p)
{
        struct em28xx *dev = video_drvdata(file);

        p->parm.capture.readbuffers = EM28XX_MIN_BUF;
        return v4l2_device_call_until_err(&dev->v4l2->v4l2_dev,
                                          0, video, s_parm, p);
}

static const char *iname[] = {
        [EM28XX_VMUX_COMPOSITE1] = "Composite1",
        [EM28XX_VMUX_COMPOSITE2] = "Composite2",
        [EM28XX_VMUX_COMPOSITE3] = "Composite3",
        [EM28XX_VMUX_COMPOSITE4] = "Composite4",
        [EM28XX_VMUX_SVIDEO]     = "S-Video",
        [EM28XX_VMUX_TELEVISION] = "Television",
        [EM28XX_VMUX_CABLE]      = "Cable TV",
        [EM28XX_VMUX_DVB]        = "DVB",
        [EM28XX_VMUX_DEBUG]      = "for debug only",
};

static int vidioc_enum_input(struct file *file, void *priv,
                             struct v4l2_input *i)
{
        struct em28xx *dev = video_drvdata(file);
        unsigned int       n;

        n = i->index;
        if (n >= MAX_EM28XX_INPUT)
                return -EINVAL;
        if (0 == INPUT(n)->type)
                return -EINVAL;

        i->index = n;
        i->type = V4L2_INPUT_TYPE_CAMERA;

        strcpy(i->name, iname[INPUT(n)->type]);

        if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
            (EM28XX_VMUX_CABLE == INPUT(n)->type))
                i->type = V4L2_INPUT_TYPE_TUNER;

        i->std = dev->v4l2->vdev->tvnorms;
        /* webcams do not have the STD API */
        if (dev->board.is_webcam)
                i->capabilities = 0;

        return 0;
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
        struct em28xx *dev = video_drvdata(file);

        *i = dev->ctl_input;

        return 0;
}

static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
        struct em28xx *dev = video_drvdata(file);

        if (i >= MAX_EM28XX_INPUT)
                return -EINVAL;
        if (0 == INPUT(i)->type)
                return -EINVAL;

        video_mux(dev, i);
        return 0;
}

static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
{
        struct em28xx *dev = video_drvdata(file);

        switch (a->index) {
        case EM28XX_AMUX_VIDEO:
                strcpy(a->name, "Television");
                break;
        case EM28XX_AMUX_LINE_IN:
                strcpy(a->name, "Line In");
                break;
        case EM28XX_AMUX_VIDEO2:
                strcpy(a->name, "Television alt");
                break;
        case EM28XX_AMUX_PHONE:
                strcpy(a->name, "Phone");
                break;
        case EM28XX_AMUX_MIC:
                strcpy(a->name, "Mic");
                break;
        case EM28XX_AMUX_CD:
                strcpy(a->name, "CD");
                break;
        case EM28XX_AMUX_AUX:
                strcpy(a->name, "Aux");
                break;
        case EM28XX_AMUX_PCM_OUT:
                strcpy(a->name, "PCM");
                break;
        default:
                return -EINVAL;
        }

        a->index = dev->ctl_ainput;
        a->capability = V4L2_AUDCAP_STEREO;

        return 0;
}

static int vidioc_s_audio(struct file *file, void *priv, const struct v4l2_audio *a)
{
        struct em28xx *dev = video_drvdata(file);

        if (a->index >= MAX_EM28XX_INPUT)
                return -EINVAL;
        if (0 == INPUT(a->index)->type)
                return -EINVAL;

        dev->ctl_ainput = INPUT(a->index)->amux;
        dev->ctl_aoutput = INPUT(a->index)->aout;

        if (!dev->ctl_aoutput)
                dev->ctl_aoutput = EM28XX_AOUT_MASTER;

        return 0;
}

static int vidioc_g_tuner(struct file *file, void *priv,
                          struct v4l2_tuner *t)
{
        struct em28xx *dev = video_drvdata(file);

        if (0 != t->index)
                return -EINVAL;

        strcpy(t->name, "Tuner");

        v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);
        return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
                          const struct v4l2_tuner *t)
{
        struct em28xx *dev = video_drvdata(file);

        if (0 != t->index)
                return -EINVAL;

        v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);
        return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                              struct v4l2_frequency *f)
{
        struct em28xx         *dev = video_drvdata(file);
        struct em28xx_v4l2    *v4l2 = dev->v4l2;

        if (0 != f->tuner)
                return -EINVAL;

        f->frequency = v4l2->frequency;
        return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
                              const struct v4l2_frequency *f)
{
        struct v4l2_frequency  new_freq = *f;
        struct em28xx             *dev  = video_drvdata(file);
        struct em28xx_v4l2        *v4l2 = dev->v4l2;

        if (0 != f->tuner)
                return -EINVAL;

        v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_frequency, f);
        v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, g_frequency, &new_freq);
        v4l2->frequency = new_freq.frequency;

        return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_chip_info(struct file *file, void *priv,
                              struct v4l2_dbg_chip_info *chip)
{
        struct em28xx *dev = video_drvdata(file);

        if (chip->match.addr > 1)
                return -EINVAL;
        if (chip->match.addr == 1)
                strlcpy(chip->name, "ac97", sizeof(chip->name));
        else
                strlcpy(chip->name,
                        dev->v4l2->v4l2_dev.name, sizeof(chip->name));
        return 0;
}

static int em28xx_reg_len(int reg)
{
        switch (reg) {
        case EM28XX_R40_AC97LSB:
        case EM28XX_R30_HSCALELOW:
        case EM28XX_R32_VSCALELOW:
                return 2;
        default:
                return 1;
        }
}

static int vidioc_g_register(struct file *file, void *priv,
                             struct v4l2_dbg_register *reg)
{
        struct em28xx *dev = video_drvdata(file);
        int ret;

        if (reg->match.addr > 1)
                return -EINVAL;
        if (reg->match.addr) {
                ret = em28xx_read_ac97(dev, reg->reg);
                if (ret < 0)
                        return ret;

                reg->val = ret;
                reg->size = 1;
                return 0;
        }

        /* Match host */
        reg->size = em28xx_reg_len(reg->reg);
        if (reg->size == 1) {
                ret = em28xx_read_reg(dev, reg->reg);

                if (ret < 0)
                        return ret;

                reg->val = ret;
        } else {
                __le16 val = 0;

                ret = dev->em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
                                                   reg->reg, (char *)&val, 2);
                if (ret < 0)
                        return ret;

                reg->val = le16_to_cpu(val);
        }

        return 0;
}

static int vidioc_s_register(struct file *file, void *priv,
                             const struct v4l2_dbg_register *reg)
{
        struct em28xx *dev = video_drvdata(file);
        __le16 buf;

        if (reg->match.addr > 1)
                return -EINVAL;
        if (reg->match.addr)
                return em28xx_write_ac97(dev, reg->reg, reg->val);

        /* Match host */
        buf = cpu_to_le16(reg->val);

        return em28xx_write_regs(dev, reg->reg, (char *)&buf,
                               em28xx_reg_len(reg->reg));
}
#endif

static int vidioc_querycap(struct file *file, void  *priv,
                           struct v4l2_capability *cap)
{
        struct video_device   *vdev = video_devdata(file);
        struct em28xx         *dev  = video_drvdata(file);
        struct em28xx_v4l2    *v4l2 = dev->v4l2;

        strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
        strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
        usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));

        if (vdev->vfl_type == VFL_TYPE_GRABBER)
                cap->device_caps = V4L2_CAP_READWRITE |
                        V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
        else if (vdev->vfl_type == VFL_TYPE_RADIO)
                cap->device_caps = V4L2_CAP_RADIO;
        else
                cap->device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VBI_CAPTURE;

        if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
                cap->device_caps |= V4L2_CAP_AUDIO;

        if (dev->tuner_type != TUNER_ABSENT)
                cap->device_caps |= V4L2_CAP_TUNER;

        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS |
                V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
        if (v4l2->vbi_dev)
                cap->capabilities |= V4L2_CAP_VBI_CAPTURE;
        if (v4l2->radio_dev)
                cap->capabilities |= V4L2_CAP_RADIO;
        return 0;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
                                   struct v4l2_fmtdesc *f)
{
        if (unlikely(f->index >= ARRAY_SIZE(format)))
                return -EINVAL;

        strlcpy(f->description, format[f->index].name, sizeof(f->description));
        f->pixelformat = format[f->index].fourcc;

        return 0;
}

static int vidioc_enum_framesizes(struct file *file, void *priv,
                                  struct v4l2_frmsizeenum *fsize)
{
        struct em28xx         *dev = video_drvdata(file);
        struct em28xx_fmt     *fmt;
        unsigned int          maxw = norm_maxw(dev);
        unsigned int          maxh = norm_maxh(dev);

        fmt = format_by_fourcc(fsize->pixel_format);
        if (!fmt) {
                em28xx_videodbg("Fourcc format (%08x) invalid.\n",
                                fsize->pixel_format);
                return -EINVAL;
        }

        if (dev->board.is_em2800) {
                if (fsize->index > 1)
                        return -EINVAL;
                fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
                fsize->discrete.width = maxw / (1 + fsize->index);
                fsize->discrete.height = maxh / (1 + fsize->index);
                return 0;
        }

        if (fsize->index != 0)
                return -EINVAL;

        /* Report a continuous range */
        fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
        scale_to_size(dev, EM28XX_HVSCALE_MAX, EM28XX_HVSCALE_MAX,
                      &fsize->stepwise.min_width, &fsize->stepwise.min_height);
        if (fsize->stepwise.min_width < 48)
                fsize->stepwise.min_width = 48;
        if (fsize->stepwise.min_height < 38)
                fsize->stepwise.min_height = 38;
        fsize->stepwise.max_width = maxw;
        fsize->stepwise.max_height = maxh;
        fsize->stepwise.step_width = 1;
        fsize->stepwise.step_height = 1;
        return 0;
}

/* RAW VBI ioctls */

static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
                                struct v4l2_format *format)
{
        struct em28xx         *dev  = video_drvdata(file);
        struct em28xx_v4l2    *v4l2 = dev->v4l2;

        format->fmt.vbi.samples_per_line = v4l2->vbi_width;
        format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
        format->fmt.vbi.offset = 0;
        format->fmt.vbi.flags = 0;
        format->fmt.vbi.sampling_rate = 6750000 * 4 / 2;
        format->fmt.vbi.count[0] = v4l2->vbi_height;
        format->fmt.vbi.count[1] = v4l2->vbi_height;
        memset(format->fmt.vbi.reserved, 0, sizeof(format->fmt.vbi.reserved));

        /* Varies by video standard (NTSC, PAL, etc.) */
        if (v4l2->norm & V4L2_STD_525_60) {
                /* NTSC */
                format->fmt.vbi.start[0] = 10;
                format->fmt.vbi.start[1] = 273;
        } else if (v4l2->norm & V4L2_STD_625_50) {
                /* PAL */
                format->fmt.vbi.start[0] = 6;
                format->fmt.vbi.start[1] = 318;
        }

        return 0;
}

/* ----------------------------------------------------------- */
/* RADIO ESPECIFIC IOCTLS                                      */
/* ----------------------------------------------------------- */

static int radio_g_tuner(struct file *file, void *priv,
                         struct v4l2_tuner *t)
{
        struct em28xx *dev = video_drvdata(file);

        if (unlikely(t->index > 0))
                return -EINVAL;

        strcpy(t->name, "Radio");

        v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, g_tuner, t);

        return 0;
}

static int radio_s_tuner(struct file *file, void *priv,
                         const struct v4l2_tuner *t)
{
        struct em28xx *dev = video_drvdata(file);

        if (0 != t->index)
                return -EINVAL;

        v4l2_device_call_all(&dev->v4l2->v4l2_dev, 0, tuner, s_tuner, t);

        return 0;
}

/*
 * em28xx_free_v4l2() - Free struct em28xx_v4l2
 *
 * @ref: struct kref for struct em28xx_v4l2
 *
 * Called when all users of struct em28xx_v4l2 are gone
 */
static void em28xx_free_v4l2(struct kref *ref)
{
        struct em28xx_v4l2 *v4l2 = container_of(ref, struct em28xx_v4l2, ref);

        v4l2->dev->v4l2 = NULL;
        kfree(v4l2);
}

/*
 * em28xx_v4l2_open()
 * inits the device and starts isoc transfer
 */
static int em28xx_v4l2_open(struct file *filp)
{
        struct video_device *vdev = video_devdata(filp);
        struct em28xx *dev = video_drvdata(filp);
        struct em28xx_v4l2 *v4l2 = dev->v4l2;
        enum v4l2_buf_type fh_type = 0;
        int ret;

        switch (vdev->vfl_type) {
        case VFL_TYPE_GRABBER:
                fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
                break;
        case VFL_TYPE_VBI:
                fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
                break;
        case VFL_TYPE_RADIO:
                break;
        default:
                return -EINVAL;
        }

        em28xx_videodbg("open dev=%s type=%s users=%d\n",
                        video_device_node_name(vdev), v4l2_type_names[fh_type],
                        v4l2->users);

        if (mutex_lock_interruptible(&dev->lock))
                return -ERESTARTSYS;

        ret = v4l2_fh_open(filp);
        if (ret) {
                em28xx_errdev("%s: v4l2_fh_open() returned error %d\n",
                              __func__, ret);
                mutex_unlock(&dev->lock);
                return ret;
        }

        if (v4l2->users == 0) {
                em28xx_set_mode(dev, EM28XX_ANALOG_MODE);

                if (vdev->vfl_type != VFL_TYPE_RADIO)
                        em28xx_resolution_set(dev);

                /*
                 * Needed, since GPIO might have disabled power
                 * of some i2c devices
                 */
                em28xx_wake_i2c(dev);
        }

        if (vdev->vfl_type == VFL_TYPE_RADIO) {
                em28xx_videodbg("video_open: setting radio device\n");
                v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, s_radio);
        }

        kref_get(&dev->ref);
        kref_get(&v4l2->ref);
        v4l2->users++;

        mutex_unlock(&dev->lock);

        return 0;
}

/*
 * em28xx_v4l2_fini()
 * unregisters the v4l2,i2c and usb devices
 * called when the device gets disconected or at module unload
*/
static int em28xx_v4l2_fini(struct em28xx *dev)
{
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        if (dev->is_audio_only) {
                /* Shouldn't initialize IR for this interface */
                return 0;
        }

        if (!dev->has_video) {
                /* This device does not support the v4l2 extension */
                return 0;
        }

        if (v4l2 == NULL)
                return 0;

        em28xx_info("Closing video extension");

        mutex_lock(&dev->lock);

        v4l2_device_disconnect(&v4l2->v4l2_dev);

        em28xx_uninit_usb_xfer(dev, EM28XX_ANALOG_MODE);

        if (v4l2->radio_dev) {
                em28xx_info("V4L2 device %s deregistered\n",
                            video_device_node_name(v4l2->radio_dev));
                video_unregister_device(v4l2->radio_dev);
        }
        if (v4l2->vbi_dev) {
                em28xx_info("V4L2 device %s deregistered\n",
                            video_device_node_name(v4l2->vbi_dev));
                video_unregister_device(v4l2->vbi_dev);
        }
        if (v4l2->vdev) {
                em28xx_info("V4L2 device %s deregistered\n",
                            video_device_node_name(v4l2->vdev));
                video_unregister_device(v4l2->vdev);
        }

        v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
        v4l2_device_unregister(&v4l2->v4l2_dev);

        if (v4l2->clk) {
                v4l2_clk_unregister_fixed(v4l2->clk);
                v4l2->clk = NULL;
        }

        kref_put(&v4l2->ref, em28xx_free_v4l2);

        mutex_unlock(&dev->lock);

        kref_put(&dev->ref, em28xx_free_device);

        return 0;
}

static int em28xx_v4l2_suspend(struct em28xx *dev)
{
        if (dev->is_audio_only)
                return 0;

        if (!dev->has_video)
                return 0;

        em28xx_info("Suspending video extension");
        em28xx_stop_urbs(dev);
        return 0;
}

static int em28xx_v4l2_resume(struct em28xx *dev)
{
        if (dev->is_audio_only)
                return 0;

        if (!dev->has_video)
                return 0;

        em28xx_info("Resuming video extension");
        /* what do we do here */
        return 0;
}

/*
 * em28xx_v4l2_close()
 * stops streaming and deallocates all resources allocated by the v4l2
 * calls and ioctls
 */
static int em28xx_v4l2_close(struct file *filp)
{
        struct em28xx         *dev  = video_drvdata(filp);
        struct em28xx_v4l2    *v4l2 = dev->v4l2;
        int              errCode;

        em28xx_videodbg("users=%d\n", v4l2->users);

        vb2_fop_release(filp);
        mutex_lock(&dev->lock);

        if (v4l2->users == 1) {
                /* No sense to try to write to the device */
                if (dev->disconnected)
                        goto exit;

                /* Save some power by putting tuner to sleep */
                v4l2_device_call_all(&v4l2->v4l2_dev, 0, core, s_power, 0);

                /* do this before setting alternate! */
                em28xx_set_mode(dev, EM28XX_SUSPEND);

                /* set alternate 0 */
                dev->alt = 0;
                em28xx_videodbg("setting alternate 0\n");
                errCode = usb_set_interface(dev->udev, 0, 0);
                if (errCode < 0) {
                        em28xx_errdev("cannot change alternate number to "
                                        "0 (error=%i)\n", errCode);
                }
        }

exit:
        v4l2->users--;
        kref_put(&v4l2->ref, em28xx_free_v4l2);
        mutex_unlock(&dev->lock);
        kref_put(&dev->ref, em28xx_free_device);

        return 0;
}

static const struct v4l2_file_operations em28xx_v4l_fops = {
        .owner         = THIS_MODULE,
        .open          = em28xx_v4l2_open,
        .release       = em28xx_v4l2_close,
        .read          = vb2_fop_read,
        .poll          = vb2_fop_poll,
        .mmap          = vb2_fop_mmap,
        .unlocked_ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops video_ioctl_ops = {
        .vidioc_querycap            = vidioc_querycap,
        .vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
        .vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
        .vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
        .vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
        .vidioc_g_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
        .vidioc_try_fmt_vbi_cap     = vidioc_g_fmt_vbi_cap,
        .vidioc_s_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
        .vidioc_enum_framesizes     = vidioc_enum_framesizes,
        .vidioc_g_audio             = vidioc_g_audio,
        .vidioc_s_audio             = vidioc_s_audio,

        .vidioc_reqbufs             = vb2_ioctl_reqbufs,
        .vidioc_create_bufs         = vb2_ioctl_create_bufs,
        .vidioc_prepare_buf         = vb2_ioctl_prepare_buf,
        .vidioc_querybuf            = vb2_ioctl_querybuf,
        .vidioc_qbuf                = vb2_ioctl_qbuf,
        .vidioc_dqbuf               = vb2_ioctl_dqbuf,

        .vidioc_g_std               = vidioc_g_std,
        .vidioc_querystd            = vidioc_querystd,
        .vidioc_s_std               = vidioc_s_std,
        .vidioc_g_parm              = vidioc_g_parm,
        .vidioc_s_parm              = vidioc_s_parm,
        .vidioc_enum_input          = vidioc_enum_input,
        .vidioc_g_input             = vidioc_g_input,
        .vidioc_s_input             = vidioc_s_input,
        .vidioc_streamon            = vb2_ioctl_streamon,
        .vidioc_streamoff           = vb2_ioctl_streamoff,
        .vidioc_g_tuner             = vidioc_g_tuner,
        .vidioc_s_tuner             = vidioc_s_tuner,
        .vidioc_g_frequency         = vidioc_g_frequency,
        .vidioc_s_frequency         = vidioc_s_frequency,
        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .vidioc_g_chip_info         = vidioc_g_chip_info,
        .vidioc_g_register          = vidioc_g_register,
        .vidioc_s_register          = vidioc_s_register,
#endif
};

static const struct video_device em28xx_video_template = {
        .fops           = &em28xx_v4l_fops,
        .ioctl_ops      = &video_ioctl_ops,
        .release        = video_device_release,
        .tvnorms        = V4L2_STD_ALL,
};

static const struct v4l2_file_operations radio_fops = {
        .owner         = THIS_MODULE,
        .open          = em28xx_v4l2_open,
        .release       = em28xx_v4l2_close,
        .unlocked_ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops radio_ioctl_ops = {
        .vidioc_querycap      = vidioc_querycap,
        .vidioc_g_tuner       = radio_g_tuner,
        .vidioc_s_tuner       = radio_s_tuner,
        .vidioc_g_frequency   = vidioc_g_frequency,
        .vidioc_s_frequency   = vidioc_s_frequency,
        .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .vidioc_g_chip_info   = vidioc_g_chip_info,
        .vidioc_g_register    = vidioc_g_register,
        .vidioc_s_register    = vidioc_s_register,
#endif
};

static struct video_device em28xx_radio_template = {
        .fops           = &radio_fops,
        .ioctl_ops      = &radio_ioctl_ops,
        .release        = video_device_release,
};

/* I2C possible address to saa7115, tvp5150, msp3400, tvaudio */
static unsigned short saa711x_addrs[] = {
        0x4a >> 1, 0x48 >> 1,   /* SAA7111, SAA7111A and SAA7113 */
        0x42 >> 1, 0x40 >> 1,   /* SAA7114, SAA7115 and SAA7118 */
        I2C_CLIENT_END };

static unsigned short tvp5150_addrs[] = {
        0xb8 >> 1,
        0xba >> 1,
        I2C_CLIENT_END
};

static unsigned short msp3400_addrs[] = {
        0x80 >> 1,
        0x88 >> 1,
        I2C_CLIENT_END
};

/******************************** usb interface ******************************/

static struct video_device
*em28xx_vdev_init(struct em28xx *dev,
                  const struct video_device *template,
                  const char *type_name)
{
        struct video_device *vfd;

        vfd = video_device_alloc();
        if (NULL == vfd)
                return NULL;

        *vfd            = *template;
        vfd->v4l2_dev   = &dev->v4l2->v4l2_dev;
        vfd->debug      = video_debug;
        vfd->lock       = &dev->lock;
        if (dev->board.is_webcam)
                vfd->tvnorms = 0;

        snprintf(vfd->name, sizeof(vfd->name), "%s %s",
                 dev->name, type_name);

        video_set_drvdata(vfd, dev);
        return vfd;
}

static void em28xx_tuner_setup(struct em28xx *dev, unsigned short tuner_addr)
{
        struct em28xx_v4l2      *v4l2 = dev->v4l2;
        struct v4l2_device      *v4l2_dev = &v4l2->v4l2_dev;
        struct tuner_setup      tun_setup;
        struct v4l2_frequency   f;

        memset(&tun_setup, 0, sizeof(tun_setup));

        tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
        tun_setup.tuner_callback = em28xx_tuner_callback;

        if (dev->board.radio.type) {
                tun_setup.type = dev->board.radio.type;
                tun_setup.addr = dev->board.radio_addr;

                v4l2_device_call_all(v4l2_dev,
                                     0, tuner, s_type_addr, &tun_setup);
        }

        if ((dev->tuner_type != TUNER_ABSENT) && (dev->tuner_type)) {
                tun_setup.type   = dev->tuner_type;
                tun_setup.addr   = tuner_addr;

                v4l2_device_call_all(v4l2_dev,
                                     0, tuner, s_type_addr, &tun_setup);
        }

        if (dev->board.tda9887_conf) {
                struct v4l2_priv_tun_config tda9887_cfg;

                tda9887_cfg.tuner = TUNER_TDA9887;
                tda9887_cfg.priv = &dev->board.tda9887_conf;

                v4l2_device_call_all(v4l2_dev,
                                     0, tuner, s_config, &tda9887_cfg);
        }

        if (dev->tuner_type == TUNER_XC2028) {
                struct v4l2_priv_tun_config  xc2028_cfg;
                struct xc2028_ctrl           ctl;

                memset(&xc2028_cfg, 0, sizeof(xc2028_cfg));
                memset(&ctl, 0, sizeof(ctl));

                em28xx_setup_xc3028(dev, &ctl);

                xc2028_cfg.tuner = TUNER_XC2028;
                xc2028_cfg.priv  = &ctl;

                v4l2_device_call_all(v4l2_dev, 0, tuner, s_config, &xc2028_cfg);
        }

        /* configure tuner */
        f.tuner = 0;
        f.type = V4L2_TUNER_ANALOG_TV;
        f.frequency = 9076;     /* just a magic number */
        v4l2->frequency = f.frequency;
        v4l2_device_call_all(v4l2_dev, 0, tuner, s_frequency, &f);
}

static int em28xx_v4l2_init(struct em28xx *dev)
{
        u8 val;
        int ret;
        unsigned int maxw;
        struct v4l2_ctrl_handler *hdl;
        struct em28xx_v4l2 *v4l2;

        if (dev->is_audio_only) {
                /* Shouldn't initialize IR for this interface */
                return 0;
        }

        if (!dev->has_video) {
                /* This device does not support the v4l2 extension */
                return 0;
        }

        em28xx_info("Registering V4L2 extension\n");

        mutex_lock(&dev->lock);

        v4l2 = kzalloc(sizeof(struct em28xx_v4l2), GFP_KERNEL);
        if (v4l2 == NULL) {
                em28xx_info("em28xx_v4l: memory allocation failed\n");
                mutex_unlock(&dev->lock);
                return -ENOMEM;
        }
        kref_init(&v4l2->ref);
        v4l2->dev = dev;
        dev->v4l2 = v4l2;

        ret = v4l2_device_register(&dev->udev->dev, &v4l2->v4l2_dev);
        if (ret < 0) {
                em28xx_errdev("Call to v4l2_device_register() failed!\n");
                goto err;
        }

        hdl = &v4l2->ctrl_handler;
        v4l2_ctrl_handler_init(hdl, 8);
        v4l2->v4l2_dev.ctrl_handler = hdl;

        if (dev->board.is_webcam)
                v4l2->progressive = true;

        /*
         * Default format, used for tvp5150 or saa711x output formats
         */
        v4l2->vinmode = 0x10;
        v4l2->vinctl  = EM28XX_VINCTRL_INTERLACED |
                        EM28XX_VINCTRL_CCIR656_ENABLE;

        /* request some modules */

        if (dev->board.has_msp34xx)
                v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                    &dev->i2c_adap[dev->def_i2c_bus],
                                    "msp3400", 0, msp3400_addrs);

        if (dev->board.decoder == EM28XX_SAA711X)
                v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                    &dev->i2c_adap[dev->def_i2c_bus],
                                    "saa7115_auto", 0, saa711x_addrs);

        if (dev->board.decoder == EM28XX_TVP5150)
                v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                    &dev->i2c_adap[dev->def_i2c_bus],
                                    "tvp5150", 0, tvp5150_addrs);

        if (dev->board.adecoder == EM28XX_TVAUDIO)
                v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                    &dev->i2c_adap[dev->def_i2c_bus],
                                    "tvaudio", dev->board.tvaudio_addr, NULL);

        /* Initialize tuner and camera */

        if (dev->board.tuner_type != TUNER_ABSENT) {
                unsigned short tuner_addr = dev->board.tuner_addr;
                int has_demod = (dev->board.tda9887_conf & TDA9887_PRESENT);

                if (dev->board.radio.type)
                        v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                            &dev->i2c_adap[dev->def_i2c_bus],
                                            "tuner", dev->board.radio_addr,
                                            NULL);

                if (has_demod)
                        v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                            &dev->i2c_adap[dev->def_i2c_bus],
                                            "tuner", 0,
                                            v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
                if (tuner_addr == 0) {
                        enum v4l2_i2c_tuner_type type =
                                has_demod ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
                        struct v4l2_subdev *sd;

                        sd = v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 "tuner", 0,
                                                 v4l2_i2c_tuner_addrs(type));

                        if (sd)
                                tuner_addr = v4l2_i2c_subdev_addr(sd);
                } else {
                        v4l2_i2c_new_subdev(&v4l2->v4l2_dev,
                                            &dev->i2c_adap[dev->def_i2c_bus],
                                            "tuner", tuner_addr, NULL);
                }

                em28xx_tuner_setup(dev, tuner_addr);
        }

        if (dev->em28xx_sensor != EM28XX_NOSENSOR)
                em28xx_init_camera(dev);

        /* Configure audio */
        ret = em28xx_audio_setup(dev);
        if (ret < 0) {
                em28xx_errdev("%s: Error while setting audio - error [%d]!\n",
                              __func__, ret);
                goto unregister_dev;
        }
        if (dev->audio_mode.ac97 != EM28XX_NO_AC97) {
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_AUDIO_VOLUME, 0, 0x1f, 1, 0x1f);
        } else {
                /* install the em28xx notify callback */
                v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_MUTE),
                                 em28xx_ctrl_notify, dev);
                v4l2_ctrl_notify(v4l2_ctrl_find(hdl, V4L2_CID_AUDIO_VOLUME),
                                 em28xx_ctrl_notify, dev);
        }

        /* wake i2c devices */
        em28xx_wake_i2c(dev);

        /* init video dma queues */
        INIT_LIST_HEAD(&dev->vidq.active);
        INIT_LIST_HEAD(&dev->vbiq.active);

        if (dev->board.has_msp34xx) {
                /* Send a reset to other chips via gpio */
                ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xf7);
                if (ret < 0) {
                        em28xx_errdev("%s: em28xx_write_reg - msp34xx(1) failed! error [%d]\n",
                                      __func__, ret);
                        goto unregister_dev;
                }
                msleep(3);

                ret = em28xx_write_reg(dev, EM2820_R08_GPIO_CTRL, 0xff);
                if (ret < 0) {
                        em28xx_errdev("%s: em28xx_write_reg - msp34xx(2) failed! error [%d]\n",
                                      __func__, ret);
                        goto unregister_dev;
                }
                msleep(3);
        }

        /* set default norm */
        v4l2->norm = V4L2_STD_PAL;
        v4l2_device_call_all(&v4l2->v4l2_dev, 0, video, s_std, v4l2->norm);
        v4l2->interlaced_fieldmode = EM28XX_INTERLACED_DEFAULT;

        /* Analog specific initialization */
        v4l2->format = &format[0];

        maxw = norm_maxw(dev);
        /* MaxPacketSize for em2800 is too small to capture at full resolution
         * use half of maxw as the scaler can only scale to 50% */
        if (dev->board.is_em2800)
                maxw /= 2;

        em28xx_set_video_format(dev, format[0].fourcc,
                                maxw, norm_maxh(dev));

        video_mux(dev, 0);

        /* Audio defaults */
        dev->mute = 1;
        dev->volume = 0x1f;

/*      em28xx_write_reg(dev, EM28XX_R0E_AUDIOSRC, 0xc0); audio register */
        val = (u8)em28xx_read_reg(dev, EM28XX_R0F_XCLK);
        em28xx_write_reg(dev, EM28XX_R0F_XCLK,
                         (EM28XX_XCLK_AUDIO_UNMUTE | val));

        em28xx_set_outfmt(dev);

        /* Add image controls */
        /* NOTE: at this point, the subdevices are already registered, so bridge
         * controls are only added/enabled when no subdevice provides them */
        if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_CONTRAST))
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_CONTRAST,
                                  0, 0x1f, 1, CONTRAST_DEFAULT);
        if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_BRIGHTNESS))
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_BRIGHTNESS,
                                  -0x80, 0x7f, 1, BRIGHTNESS_DEFAULT);
        if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_SATURATION))
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_SATURATION,
                                  0, 0x1f, 1, SATURATION_DEFAULT);
        if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_BLUE_BALANCE))
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_BLUE_BALANCE,
                                  -0x30, 0x30, 1, BLUE_BALANCE_DEFAULT);
        if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_RED_BALANCE))
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_RED_BALANCE,
                                  -0x30, 0x30, 1, RED_BALANCE_DEFAULT);
        if (NULL == v4l2_ctrl_find(hdl, V4L2_CID_SHARPNESS))
                v4l2_ctrl_new_std(hdl, &em28xx_ctrl_ops,
                                  V4L2_CID_SHARPNESS,
                                  0, 0x0f, 1, SHARPNESS_DEFAULT);

        /* Reset image controls */
        em28xx_colorlevels_set_default(dev);
        v4l2_ctrl_handler_setup(hdl);
        ret = hdl->error;
        if (ret)
                goto unregister_dev;

        /* allocate and fill video video_device struct */
        v4l2->vdev = em28xx_vdev_init(dev, &em28xx_video_template, "video");
        if (!v4l2->vdev) {
                em28xx_errdev("cannot allocate video_device.\n");
                ret = -ENODEV;
                goto unregister_dev;
        }
        mutex_init(&v4l2->vb_queue_lock);
        mutex_init(&v4l2->vb_vbi_queue_lock);
        v4l2->vdev->queue = &v4l2->vb_vidq;
        v4l2->vdev->queue->lock = &v4l2->vb_queue_lock;

        /* disable inapplicable ioctls */
        if (dev->board.is_webcam) {
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_QUERYSTD);
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_STD);
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_STD);
        } else {
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_PARM);
        }
        if (dev->tuner_type == TUNER_ABSENT) {
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_TUNER);
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_TUNER);
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_FREQUENCY);
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_FREQUENCY);
        }
        if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_G_AUDIO);
                v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_AUDIO);
        }

        /* register v4l2 video video_device */
        ret = video_register_device(v4l2->vdev, VFL_TYPE_GRABBER,
                                    video_nr[dev->devno]);
        if (ret) {
                em28xx_errdev("unable to register video device (error=%i).\n",
                              ret);
                goto unregister_dev;
        }

        /* Allocate and fill vbi video_device struct */
        if (em28xx_vbi_supported(dev) == 1) {
                v4l2->vbi_dev = em28xx_vdev_init(dev, &em28xx_video_template,
                                                "vbi");

                v4l2->vbi_dev->queue = &v4l2->vb_vbiq;
                v4l2->vbi_dev->queue->lock = &v4l2->vb_vbi_queue_lock;

                /* disable inapplicable ioctls */
                v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_S_PARM);
                if (dev->tuner_type == TUNER_ABSENT) {
                        v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_G_TUNER);
                        v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_S_TUNER);
                        v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_G_FREQUENCY);
                        v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_S_FREQUENCY);
                }
                if (dev->int_audio_type == EM28XX_INT_AUDIO_NONE) {
                        v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_G_AUDIO);
                        v4l2_disable_ioctl(v4l2->vbi_dev, VIDIOC_S_AUDIO);
                }

                /* register v4l2 vbi video_device */
                ret = video_register_device(v4l2->vbi_dev, VFL_TYPE_VBI,
                                            vbi_nr[dev->devno]);
                if (ret < 0) {
                        em28xx_errdev("unable to register vbi device\n");
                        goto unregister_dev;
                }
        }

        if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
                v4l2->radio_dev = em28xx_vdev_init(dev, &em28xx_radio_template,
                                                   "radio");
                if (!v4l2->radio_dev) {
                        em28xx_errdev("cannot allocate video_device.\n");
                        ret = -ENODEV;
                        goto unregister_dev;
                }
                ret = video_register_device(v4l2->radio_dev, VFL_TYPE_RADIO,
                                            radio_nr[dev->devno]);
                if (ret < 0) {
                        em28xx_errdev("can't register radio device\n");
                        goto unregister_dev;
                }
                em28xx_info("Registered radio device as %s\n",
                            video_device_node_name(v4l2->radio_dev));
        }

        em28xx_info("V4L2 video device registered as %s\n",
                    video_device_node_name(v4l2->vdev));

        if (v4l2->vbi_dev)
                em28xx_info("V4L2 VBI device registered as %s\n",
                            video_device_node_name(v4l2->vbi_dev));

        /* Save some power by putting tuner to sleep */
        v4l2_device_call_all(&v4l2->v4l2_dev, 0, core, s_power, 0);

        /* initialize videobuf2 stuff */
        em28xx_vb2_setup(dev);

        em28xx_info("V4L2 extension successfully initialized\n");

        kref_get(&dev->ref);

        mutex_unlock(&dev->lock);
        return 0;

unregister_dev:
        v4l2_ctrl_handler_free(&v4l2->ctrl_handler);
        v4l2_device_unregister(&v4l2->v4l2_dev);
err:
        dev->v4l2 = NULL;
        kref_put(&v4l2->ref, em28xx_free_v4l2);
        mutex_unlock(&dev->lock);
        return ret;
}

static struct em28xx_ops v4l2_ops = {
        .id   = EM28XX_V4L2,
        .name = "Em28xx v4l2 Extension",
        .init = em28xx_v4l2_init,
        .fini = em28xx_v4l2_fini,
        .suspend = em28xx_v4l2_suspend,
        .resume = em28xx_v4l2_resume,
};

static int __init em28xx_video_register(void)
{
        return em28xx_register_extension(&v4l2_ops);
}

static void __exit em28xx_video_unregister(void)
{
        em28xx_unregister_extension(&v4l2_ops);
}

module_init(em28xx_video_register);
module_exit(em28xx_video_unregister);