/*
 * TI VPFE capture Driver
 *
 * Copyright (C) 2013 - 2014 Texas Instruments, Inc.
 *
 * Benoit Parrot <bparrot@ti.com>
 * Lad, Prabhakar <prabhakar.csengg@gmail.com>
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/videodev2.h>

#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-of.h>

#include "am437x-vpfe.h"

#define VPFE_MODULE_NAME        "vpfe"
#define VPFE_VERSION            "0.1.0"

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level 0-8");

#define vpfe_dbg(level, dev, fmt, arg...)       \
                v4l2_dbg(level, debug, &dev->v4l2_dev, fmt, ##arg)
#define vpfe_info(dev, fmt, arg...)     \
                v4l2_info(&dev->v4l2_dev, fmt, ##arg)
#define vpfe_err(dev, fmt, arg...)      \
                v4l2_err(&dev->v4l2_dev, fmt, ##arg)

/* standard information */
struct vpfe_standard {
        v4l2_std_id std_id;
        unsigned int width;
        unsigned int height;
        struct v4l2_fract pixelaspect;
        int frame_format;
};

static const struct vpfe_standard vpfe_standards[] = {
        {V4L2_STD_525_60, 720, 480, {11, 10}, 1},
        {V4L2_STD_625_50, 720, 576, {54, 59}, 1},
};

struct bus_format {
        unsigned int width;
        unsigned int bpp;
};

/*
 * struct vpfe_fmt - VPFE media bus format information
 * @name: V4L2 format description
 * @code: V4L2 media bus format code
 * @shifted: V4L2 media bus format code for the same pixel layout but
 *      shifted to be 8 bits per pixel. =0 if format is not shiftable.
 * @pixelformat: V4L2 pixel format FCC identifier
 * @width: Bits per pixel (when transferred over a bus)
 * @bpp: Bytes per pixel (when stored in memory)
 * @supported: Indicates format supported by subdev
 */
struct vpfe_fmt {
        const char *name;
        u32 fourcc;
        u32 code;
        struct bus_format l;
        struct bus_format s;
        bool supported;
        u32 index;
};

static struct vpfe_fmt formats[] = {
        {
                .name           = "YUV 4:2:2 packed, YCbYCr",
                .fourcc         = V4L2_PIX_FMT_YUYV,
                .code           = MEDIA_BUS_FMT_YUYV8_2X8,
                .l.width        = 10,
                .l.bpp          = 4,
                .s.width        = 8,
                .s.bpp          = 2,
                .supported      = false,
        }, {
                .name           = "YUV 4:2:2 packed, CbYCrY",
                .fourcc         = V4L2_PIX_FMT_UYVY,
                .code           = MEDIA_BUS_FMT_UYVY8_2X8,
                .l.width        = 10,
                .l.bpp          = 4,
                .s.width        = 8,
                .s.bpp          = 2,
                .supported      = false,
        }, {
                .name           = "YUV 4:2:2 packed, YCrYCb",
                .fourcc         = V4L2_PIX_FMT_YVYU,
                .code           = MEDIA_BUS_FMT_YVYU8_2X8,
                .l.width        = 10,
                .l.bpp          = 4,
                .s.width        = 8,
                .s.bpp          = 2,
                .supported      = false,
        }, {
                .name           = "YUV 4:2:2 packed, CrYCbY",
                .fourcc         = V4L2_PIX_FMT_VYUY,
                .code           = MEDIA_BUS_FMT_VYUY8_2X8,
                .l.width        = 10,
                .l.bpp          = 4,
                .s.width        = 8,
                .s.bpp          = 2,
                .supported      = false,
        }, {
                .name           = "RAW8 BGGR",
                .fourcc         = V4L2_PIX_FMT_SBGGR8,
                .code           = MEDIA_BUS_FMT_SBGGR8_1X8,
                .l.width        = 10,
                .l.bpp          = 2,
                .s.width        = 8,
                .s.bpp          = 1,
                .supported      = false,
        }, {
                .name           = "RAW8 GBRG",
                .fourcc         = V4L2_PIX_FMT_SGBRG8,
                .code           = MEDIA_BUS_FMT_SGBRG8_1X8,
                .l.width        = 10,
                .l.bpp          = 2,
                .s.width        = 8,
                .s.bpp          = 1,
                .supported      = false,
        }, {
                .name           = "RAW8 GRBG",
                .fourcc         = V4L2_PIX_FMT_SGRBG8,
                .code           = MEDIA_BUS_FMT_SGRBG8_1X8,
                .l.width        = 10,
                .l.bpp          = 2,
                .s.width        = 8,
                .s.bpp          = 1,
                .supported      = false,
        }, {
                .name           = "RAW8 RGGB",
                .fourcc         = V4L2_PIX_FMT_SRGGB8,
                .code           = MEDIA_BUS_FMT_SRGGB8_1X8,
                .l.width        = 10,
                .l.bpp          = 2,
                .s.width        = 8,
                .s.bpp          = 1,
                .supported      = false,
        }, {
                .name           = "RGB565 (LE)",
                .fourcc         = V4L2_PIX_FMT_RGB565,
                .code           = MEDIA_BUS_FMT_RGB565_2X8_LE,
                .l.width        = 10,
                .l.bpp          = 4,
                .s.width        = 8,
                .s.bpp          = 2,
                .supported      = false,
        }, {
                .name           = "RGB565 (BE)",
                .fourcc         = V4L2_PIX_FMT_RGB565X,
                .code           = MEDIA_BUS_FMT_RGB565_2X8_BE,
                .l.width        = 10,
                .l.bpp          = 4,
                .s.width        = 8,
                .s.bpp          = 2,
                .supported      = false,
        },
};

static int
__vpfe_get_format(struct vpfe_device *vpfe,
                  struct v4l2_format *format, unsigned int *bpp);

static struct vpfe_fmt *find_format_by_code(unsigned int code)
{
        struct vpfe_fmt *fmt;
        unsigned int k;

        for (k = 0; k < ARRAY_SIZE(formats); k++) {
                fmt = &formats[k];
                if (fmt->code == code)
                        return fmt;
        }

        return NULL;
}

static struct vpfe_fmt *find_format_by_pix(unsigned int pixelformat)
{
        struct vpfe_fmt *fmt;
        unsigned int k;

        for (k = 0; k < ARRAY_SIZE(formats); k++) {
                fmt = &formats[k];
                if (fmt->fourcc == pixelformat)
                        return fmt;
        }

        return NULL;
}

static void
mbus_to_pix(struct vpfe_device *vpfe,
            const struct v4l2_mbus_framefmt *mbus,
            struct v4l2_pix_format *pix, unsigned int *bpp)
{
        struct vpfe_subdev_info *sdinfo = vpfe->current_subdev;
        unsigned int bus_width = sdinfo->vpfe_param.bus_width;
        struct vpfe_fmt *fmt;

        fmt = find_format_by_code(mbus->code);
        if (WARN_ON(fmt == NULL)) {
                pr_err("Invalid mbus code set\n");
                *bpp = 1;
                return;
        }

        memset(pix, 0, sizeof(*pix));
        v4l2_fill_pix_format(pix, mbus);
        pix->pixelformat = fmt->fourcc;
        *bpp = (bus_width == 10) ?  fmt->l.bpp : fmt->s.bpp;

        /* pitch should be 32 bytes aligned */
        pix->bytesperline = ALIGN(pix->width * *bpp, 32);
        pix->sizeimage = pix->bytesperline * pix->height;
}

static void pix_to_mbus(struct vpfe_device *vpfe,
                        struct v4l2_pix_format *pix_fmt,
                        struct v4l2_mbus_framefmt *mbus_fmt)
{
        struct vpfe_fmt *fmt;

        fmt = find_format_by_pix(pix_fmt->pixelformat);
        if (!fmt) {
                /* default to first entry */
                vpfe_dbg(3, vpfe, "Invalid pixel code: %x, default used instead\n",
                        pix_fmt->pixelformat);
                fmt = &formats[0];
        }

        memset(mbus_fmt, 0, sizeof(*mbus_fmt));
        v4l2_fill_mbus_format(mbus_fmt, pix_fmt, fmt->code);
}

/*  Print Four-character-code (FOURCC) */
static char *print_fourcc(u32 fmt)
{
        static char code[5];

        code[0] = (unsigned char)(fmt & 0xff);
        code[1] = (unsigned char)((fmt >> 8) & 0xff);
        code[2] = (unsigned char)((fmt >> 16) & 0xff);
        code[3] = (unsigned char)((fmt >> 24) & 0xff);
        code[4] = '\0';

        return code;
}

static int
cmp_v4l2_format(const struct v4l2_format *lhs, const struct v4l2_format *rhs)
{
        return lhs->type == rhs->type &&
                lhs->fmt.pix.width == rhs->fmt.pix.width &&
                lhs->fmt.pix.height == rhs->fmt.pix.height &&
                lhs->fmt.pix.pixelformat == rhs->fmt.pix.pixelformat &&
                lhs->fmt.pix.field == rhs->fmt.pix.field &&
                lhs->fmt.pix.colorspace == rhs->fmt.pix.colorspace &&
                lhs->fmt.pix.ycbcr_enc == rhs->fmt.pix.ycbcr_enc &&
                lhs->fmt.pix.quantization == rhs->fmt.pix.quantization;
}

static inline u32 vpfe_reg_read(struct vpfe_ccdc *ccdc, u32 offset)
{
        return ioread32(ccdc->ccdc_cfg.base_addr + offset);
}

static inline void vpfe_reg_write(struct vpfe_ccdc *ccdc, u32 val, u32 offset)
{
        iowrite32(val, ccdc->ccdc_cfg.base_addr + offset);
}

static inline struct vpfe_device *to_vpfe(struct vpfe_ccdc *ccdc)
{
        return container_of(ccdc, struct vpfe_device, ccdc);
}

static inline struct vpfe_cap_buffer *to_vpfe_buffer(struct vb2_buffer *vb)
{
        return container_of(vb, struct vpfe_cap_buffer, vb);
}

static inline void vpfe_pcr_enable(struct vpfe_ccdc *ccdc, int flag)
{
        vpfe_reg_write(ccdc, !!flag, VPFE_PCR);
}

static void vpfe_config_enable(struct vpfe_ccdc *ccdc, int flag)
{
        unsigned int cfg;

        if (!flag) {
                cfg = vpfe_reg_read(ccdc, VPFE_CONFIG);
                cfg &= ~(VPFE_CONFIG_EN_ENABLE << VPFE_CONFIG_EN_SHIFT);
        } else {
                cfg = VPFE_CONFIG_EN_ENABLE << VPFE_CONFIG_EN_SHIFT;
        }

        vpfe_reg_write(ccdc, cfg, VPFE_CONFIG);
}

static void vpfe_ccdc_setwin(struct vpfe_ccdc *ccdc,
                             struct v4l2_rect *image_win,
                             enum ccdc_frmfmt frm_fmt,
                             int bpp)
{
        int horz_start, horz_nr_pixels;
        int vert_start, vert_nr_lines;
        int val, mid_img;

        /*
         * ppc - per pixel count. indicates how many pixels per cell
         * output to SDRAM. example, for ycbcr, it is one y and one c, so 2.
         * raw capture this is 1
         */
        horz_start = image_win->left * bpp;
        horz_nr_pixels = (image_win->width * bpp) - 1;
        vpfe_reg_write(ccdc, (horz_start << VPFE_HORZ_INFO_SPH_SHIFT) |
                                horz_nr_pixels, VPFE_HORZ_INFO);

        vert_start = image_win->top;

        if (frm_fmt == CCDC_FRMFMT_INTERLACED) {
                vert_nr_lines = (image_win->height >> 1) - 1;
                vert_start >>= 1;
                /* Since first line doesn't have any data */
                vert_start += 1;
                /* configure VDINT0 */
                val = (vert_start << VPFE_VDINT_VDINT0_SHIFT);
        } else {
                /* Since first line doesn't have any data */
                vert_start += 1;
                vert_nr_lines = image_win->height - 1;
                /*
                 * configure VDINT0 and VDINT1. VDINT1 will be at half
                 * of image height
                 */
                mid_img = vert_start + (image_win->height / 2);
                val = (vert_start << VPFE_VDINT_VDINT0_SHIFT) |
                                (mid_img & VPFE_VDINT_VDINT1_MASK);
        }

        vpfe_reg_write(ccdc, val, VPFE_VDINT);

        vpfe_reg_write(ccdc, (vert_start << VPFE_VERT_START_SLV0_SHIFT) |
                                vert_start, VPFE_VERT_START);
        vpfe_reg_write(ccdc, vert_nr_lines, VPFE_VERT_LINES);
}

static void vpfe_reg_dump(struct vpfe_ccdc *ccdc)
{
        struct vpfe_device *vpfe = to_vpfe(ccdc);

        vpfe_dbg(3, vpfe, "ALAW: 0x%x\n", vpfe_reg_read(ccdc, VPFE_ALAW));
        vpfe_dbg(3, vpfe, "CLAMP: 0x%x\n", vpfe_reg_read(ccdc, VPFE_CLAMP));
        vpfe_dbg(3, vpfe, "DCSUB: 0x%x\n", vpfe_reg_read(ccdc, VPFE_DCSUB));
        vpfe_dbg(3, vpfe, "BLKCMP: 0x%x\n", vpfe_reg_read(ccdc, VPFE_BLKCMP));
        vpfe_dbg(3, vpfe, "COLPTN: 0x%x\n", vpfe_reg_read(ccdc, VPFE_COLPTN));
        vpfe_dbg(3, vpfe, "SDOFST: 0x%x\n", vpfe_reg_read(ccdc, VPFE_SDOFST));
        vpfe_dbg(3, vpfe, "SYN_MODE: 0x%x\n",
                 vpfe_reg_read(ccdc, VPFE_SYNMODE));
        vpfe_dbg(3, vpfe, "HSIZE_OFF: 0x%x\n",
                 vpfe_reg_read(ccdc, VPFE_HSIZE_OFF));
        vpfe_dbg(3, vpfe, "HORZ_INFO: 0x%x\n",
                 vpfe_reg_read(ccdc, VPFE_HORZ_INFO));
        vpfe_dbg(3, vpfe, "VERT_START: 0x%x\n",
                 vpfe_reg_read(ccdc, VPFE_VERT_START));
        vpfe_dbg(3, vpfe, "VERT_LINES: 0x%x\n",
                 vpfe_reg_read(ccdc, VPFE_VERT_LINES));
}

static int
vpfe_ccdc_validate_param(struct vpfe_ccdc *ccdc,
                         struct vpfe_ccdc_config_params_raw *ccdcparam)
{
        struct vpfe_device *vpfe = to_vpfe(ccdc);
        u8 max_gamma, max_data;

        if (!ccdcparam->alaw.enable)
                return 0;

        max_gamma = ccdc_gamma_width_max_bit(ccdcparam->alaw.gamma_wd);
        max_data = ccdc_data_size_max_bit(ccdcparam->data_sz);

        if (ccdcparam->alaw.gamma_wd > VPFE_CCDC_GAMMA_BITS_09_0 ||
            ccdcparam->alaw.gamma_wd < VPFE_CCDC_GAMMA_BITS_15_6 ||
            max_gamma > max_data) {
                vpfe_dbg(1, vpfe, "Invalid data line select\n");
                return -EINVAL;
        }

        return 0;
}

static void
vpfe_ccdc_update_raw_params(struct vpfe_ccdc *ccdc,
                            struct vpfe_ccdc_config_params_raw *raw_params)
{
        struct vpfe_ccdc_config_params_raw *config_params =
                                &ccdc->ccdc_cfg.bayer.config_params;

        config_params = raw_params;
}

/*
 * vpfe_ccdc_restore_defaults()
 * This function will write defaults to all CCDC registers
 */
static void vpfe_ccdc_restore_defaults(struct vpfe_ccdc *ccdc)
{
        int i;

        /* Disable CCDC */
        vpfe_pcr_enable(ccdc, 0);

        /* set all registers to default value */
        for (i = 4; i <= 0x94; i += 4)
                vpfe_reg_write(ccdc, 0,  i);

        vpfe_reg_write(ccdc, VPFE_NO_CULLING, VPFE_CULLING);
        vpfe_reg_write(ccdc, VPFE_CCDC_GAMMA_BITS_11_2, VPFE_ALAW);
}

static int vpfe_ccdc_close(struct vpfe_ccdc *ccdc, struct device *dev)
{
        int dma_cntl, i, pcr;

        /* If the CCDC module is still busy wait for it to be done */
        for (i = 0; i < 10; i++) {
                usleep_range(5000, 6000);
                pcr = vpfe_reg_read(ccdc, VPFE_PCR);
                if (!pcr)
                        break;

                /* make sure it it is disabled */
                vpfe_pcr_enable(ccdc, 0);
        }

        /* Disable CCDC by resetting all register to default POR values */
        vpfe_ccdc_restore_defaults(ccdc);

        /* if DMA_CNTL overflow bit is set. Clear it
         *  It appears to take a while for this to become quiescent ~20ms
         */
        for (i = 0; i < 10; i++) {
                dma_cntl = vpfe_reg_read(ccdc, VPFE_DMA_CNTL);
                if (!(dma_cntl & VPFE_DMA_CNTL_OVERFLOW))
                        break;

                /* Clear the overflow bit */
                vpfe_reg_write(ccdc, dma_cntl, VPFE_DMA_CNTL);
                usleep_range(5000, 6000);
        }

        /* Disabled the module at the CONFIG level */
        vpfe_config_enable(ccdc, 0);

        pm_runtime_put_sync(dev);

        return 0;
}

static int vpfe_ccdc_set_params(struct vpfe_ccdc *ccdc, void __user *params)
{
        struct vpfe_device *vpfe = container_of(ccdc, struct vpfe_device, ccdc);
        struct vpfe_ccdc_config_params_raw raw_params;
        int x;

        if (ccdc->ccdc_cfg.if_type != VPFE_RAW_BAYER)
                return -EINVAL;

        x = copy_from_user(&raw_params, params, sizeof(raw_params));
        if (x) {
                vpfe_dbg(1, vpfe,
                        "vpfe_ccdc_set_params: error in copying ccdc params, %d\n",
                        x);
                return -EFAULT;
        }

        if (!vpfe_ccdc_validate_param(ccdc, &raw_params)) {
                vpfe_ccdc_update_raw_params(ccdc, &raw_params);
                        return 0;
        }

        return -EINVAL;
}

/*
 * vpfe_ccdc_config_ycbcr()
 * This function will configure CCDC for YCbCr video capture
 */
static void vpfe_ccdc_config_ycbcr(struct vpfe_ccdc *ccdc)
{
        struct vpfe_device *vpfe = container_of(ccdc, struct vpfe_device, ccdc);
        struct ccdc_params_ycbcr *params = &ccdc->ccdc_cfg.ycbcr;
        u32 syn_mode;

        vpfe_dbg(3, vpfe, "vpfe_ccdc_config_ycbcr:\n");
        /*
         * first restore the CCDC registers to default values
         * This is important since we assume default values to be set in
         * a lot of registers that we didn't touch
         */
        vpfe_ccdc_restore_defaults(ccdc);

        /*
         * configure pixel format, frame format, configure video frame
         * format, enable output to SDRAM, enable internal timing generator
         * and 8bit pack mode
         */
        syn_mode = (((params->pix_fmt & VPFE_SYN_MODE_INPMOD_MASK) <<
                    VPFE_SYN_MODE_INPMOD_SHIFT) |
                    ((params->frm_fmt & VPFE_SYN_FLDMODE_MASK) <<
                    VPFE_SYN_FLDMODE_SHIFT) | VPFE_VDHDEN_ENABLE |
                    VPFE_WEN_ENABLE | VPFE_DATA_PACK_ENABLE);

        /* setup BT.656 sync mode */
        if (params->bt656_enable) {
                vpfe_reg_write(ccdc, VPFE_REC656IF_BT656_EN, VPFE_REC656IF);

                /*
                 * configure the FID, VD, HD pin polarity,
                 * fld,hd pol positive, vd negative, 8-bit data
                 */
                syn_mode |= VPFE_SYN_MODE_VD_POL_NEGATIVE;
                if (ccdc->ccdc_cfg.if_type == VPFE_BT656_10BIT)
                        syn_mode |= VPFE_SYN_MODE_10BITS;
                else
                        syn_mode |= VPFE_SYN_MODE_8BITS;
        } else {
                /* y/c external sync mode */
                syn_mode |= (((params->fid_pol & VPFE_FID_POL_MASK) <<
                             VPFE_FID_POL_SHIFT) |
                             ((params->hd_pol & VPFE_HD_POL_MASK) <<
                             VPFE_HD_POL_SHIFT) |
                             ((params->vd_pol & VPFE_VD_POL_MASK) <<
                             VPFE_VD_POL_SHIFT));
        }
        vpfe_reg_write(ccdc, syn_mode, VPFE_SYNMODE);

        /* configure video window */
        vpfe_ccdc_setwin(ccdc, &params->win,
                         params->frm_fmt, params->bytesperpixel);

        /*
         * configure the order of y cb cr in SDRAM, and disable latch
         * internal register on vsync
         */
        if (ccdc->ccdc_cfg.if_type == VPFE_BT656_10BIT)
                vpfe_reg_write(ccdc,
                               (params->pix_order << VPFE_CCDCFG_Y8POS_SHIFT) |
                               VPFE_LATCH_ON_VSYNC_DISABLE |
                               VPFE_CCDCFG_BW656_10BIT, VPFE_CCDCFG);
        else
                vpfe_reg_write(ccdc,
                               (params->pix_order << VPFE_CCDCFG_Y8POS_SHIFT) |
                               VPFE_LATCH_ON_VSYNC_DISABLE, VPFE_CCDCFG);

        /*
         * configure the horizontal line offset. This should be a
         * on 32 byte boundary. So clear LSB 5 bits
         */
        vpfe_reg_write(ccdc, params->bytesperline, VPFE_HSIZE_OFF);

        /* configure the memory line offset */
        if (params->buf_type == CCDC_BUFTYPE_FLD_INTERLEAVED)
                /* two fields are interleaved in memory */
                vpfe_reg_write(ccdc, VPFE_SDOFST_FIELD_INTERLEAVED,
                               VPFE_SDOFST);
}

static void
vpfe_ccdc_config_black_clamp(struct vpfe_ccdc *ccdc,
                             struct vpfe_ccdc_black_clamp *bclamp)
{
        u32 val;

        if (!bclamp->enable) {
                /* configure DCSub */
                val = (bclamp->dc_sub) & VPFE_BLK_DC_SUB_MASK;
                vpfe_reg_write(ccdc, val, VPFE_DCSUB);
                vpfe_reg_write(ccdc, VPFE_CLAMP_DEFAULT_VAL, VPFE_CLAMP);
                return;
        }
        /*
         * Configure gain,  Start pixel, No of line to be avg,
         * No of pixel/line to be avg, & Enable the Black clamping
         */
        val = ((bclamp->sgain & VPFE_BLK_SGAIN_MASK) |
               ((bclamp->start_pixel & VPFE_BLK_ST_PXL_MASK) <<
                VPFE_BLK_ST_PXL_SHIFT) |
               ((bclamp->sample_ln & VPFE_BLK_SAMPLE_LINE_MASK) <<
                VPFE_BLK_SAMPLE_LINE_SHIFT) |
               ((bclamp->sample_pixel & VPFE_BLK_SAMPLE_LN_MASK) <<
                VPFE_BLK_SAMPLE_LN_SHIFT) | VPFE_BLK_CLAMP_ENABLE);
        vpfe_reg_write(ccdc, val, VPFE_CLAMP);
        /* If Black clamping is enable then make dcsub 0 */
        vpfe_reg_write(ccdc, VPFE_DCSUB_DEFAULT_VAL, VPFE_DCSUB);
}

static void
vpfe_ccdc_config_black_compense(struct vpfe_ccdc *ccdc,
                                struct vpfe_ccdc_black_compensation *bcomp)
{
        u32 val;

        val = ((bcomp->b & VPFE_BLK_COMP_MASK) |
              ((bcomp->gb & VPFE_BLK_COMP_MASK) <<
               VPFE_BLK_COMP_GB_COMP_SHIFT) |
              ((bcomp->gr & VPFE_BLK_COMP_MASK) <<
               VPFE_BLK_COMP_GR_COMP_SHIFT) |
              ((bcomp->r & VPFE_BLK_COMP_MASK) <<
               VPFE_BLK_COMP_R_COMP_SHIFT));
        vpfe_reg_write(ccdc, val, VPFE_BLKCMP);
}

/*
 * vpfe_ccdc_config_raw()
 * This function will configure CCDC for Raw capture mode
 */
static void vpfe_ccdc_config_raw(struct vpfe_ccdc *ccdc)
{
        struct vpfe_device *vpfe = container_of(ccdc, struct vpfe_device, ccdc);
        struct vpfe_ccdc_config_params_raw *config_params =
                                &ccdc->ccdc_cfg.bayer.config_params;
        struct ccdc_params_raw *params = &ccdc->ccdc_cfg.bayer;
        unsigned int syn_mode;
        unsigned int val;

        vpfe_dbg(3, vpfe, "vpfe_ccdc_config_raw:\n");

        /* Reset CCDC */
        vpfe_ccdc_restore_defaults(ccdc);

        /* Disable latching function registers on VSYNC  */
        vpfe_reg_write(ccdc, VPFE_LATCH_ON_VSYNC_DISABLE, VPFE_CCDCFG);

        /*
         * Configure the vertical sync polarity(SYN_MODE.VDPOL),
         * horizontal sync polarity (SYN_MODE.HDPOL), frame id polarity
         * (SYN_MODE.FLDPOL), frame format(progressive or interlace),
         * data size(SYNMODE.DATSIZ), &pixel format (Input mode), output
         * SDRAM, enable internal timing generator
         */
        syn_mode = (((params->vd_pol & VPFE_VD_POL_MASK) << VPFE_VD_POL_SHIFT) |
                   ((params->hd_pol & VPFE_HD_POL_MASK) << VPFE_HD_POL_SHIFT) |
                   ((params->fid_pol & VPFE_FID_POL_MASK) <<
                   VPFE_FID_POL_SHIFT) | ((params->frm_fmt &
                   VPFE_FRM_FMT_MASK) << VPFE_FRM_FMT_SHIFT) |
                   ((config_params->data_sz & VPFE_DATA_SZ_MASK) <<
                   VPFE_DATA_SZ_SHIFT) | ((params->pix_fmt &
                   VPFE_PIX_FMT_MASK) << VPFE_PIX_FMT_SHIFT) |
                   VPFE_WEN_ENABLE | VPFE_VDHDEN_ENABLE);

        /* Enable and configure aLaw register if needed */
        if (config_params->alaw.enable) {
                val = ((config_params->alaw.gamma_wd &
                      VPFE_ALAW_GAMMA_WD_MASK) | VPFE_ALAW_ENABLE);
                vpfe_reg_write(ccdc, val, VPFE_ALAW);
                vpfe_dbg(3, vpfe, "\nWriting 0x%x to ALAW...\n", val);
        }

        /* Configure video window */
        vpfe_ccdc_setwin(ccdc, &params->win, params->frm_fmt,
                         params->bytesperpixel);

        /* Configure Black Clamp */
        vpfe_ccdc_config_black_clamp(ccdc, &config_params->blk_clamp);

        /* Configure Black level compensation */
        vpfe_ccdc_config_black_compense(ccdc, &config_params->blk_comp);

        /* If data size is 8 bit then pack the data */
        if ((config_params->data_sz == VPFE_CCDC_DATA_8BITS) ||
            config_params->alaw.enable)
                syn_mode |= VPFE_DATA_PACK_ENABLE;

        /*
         * Configure Horizontal offset register. If pack 8 is enabled then
         * 1 pixel will take 1 byte
         */
        vpfe_reg_write(ccdc, params->bytesperline, VPFE_HSIZE_OFF);

        vpfe_dbg(3, vpfe, "Writing %d (%x) to HSIZE_OFF\n",
                params->bytesperline, params->bytesperline);

        /* Set value for SDOFST */
        if (params->frm_fmt == CCDC_FRMFMT_INTERLACED) {
                if (params->image_invert_enable) {
                        /* For interlace inverse mode */
                        vpfe_reg_write(ccdc, VPFE_INTERLACED_IMAGE_INVERT,
                                   VPFE_SDOFST);
                } else {
                        /* For interlace non inverse mode */
                        vpfe_reg_write(ccdc, VPFE_INTERLACED_NO_IMAGE_INVERT,
                                   VPFE_SDOFST);
                }
        } else if (params->frm_fmt == CCDC_FRMFMT_PROGRESSIVE) {
                vpfe_reg_write(ccdc, VPFE_PROGRESSIVE_NO_IMAGE_INVERT,
                           VPFE_SDOFST);
        }

        vpfe_reg_write(ccdc, syn_mode, VPFE_SYNMODE);

        vpfe_reg_dump(ccdc);
}

static inline int
vpfe_ccdc_set_buftype(struct vpfe_ccdc *ccdc,
                      enum ccdc_buftype buf_type)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER)
                ccdc->ccdc_cfg.bayer.buf_type = buf_type;
        else
                ccdc->ccdc_cfg.ycbcr.buf_type = buf_type;

        return 0;
}

static inline enum ccdc_buftype vpfe_ccdc_get_buftype(struct vpfe_ccdc *ccdc)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER)
                return ccdc->ccdc_cfg.bayer.buf_type;

        return ccdc->ccdc_cfg.ycbcr.buf_type;
}

static int vpfe_ccdc_set_pixel_format(struct vpfe_ccdc *ccdc, u32 pixfmt)
{
        struct vpfe_device *vpfe = container_of(ccdc, struct vpfe_device, ccdc);

        vpfe_dbg(1, vpfe, "vpfe_ccdc_set_pixel_format: if_type: %d, pixfmt:%s\n",
                 ccdc->ccdc_cfg.if_type, print_fourcc(pixfmt));

        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER) {
                ccdc->ccdc_cfg.bayer.pix_fmt = CCDC_PIXFMT_RAW;
                /*
                 * Need to clear it in case it was left on
                 * after the last capture.
                 */
                ccdc->ccdc_cfg.bayer.config_params.alaw.enable = 0;

                switch (pixfmt) {
                case V4L2_PIX_FMT_SBGGR8:
                        ccdc->ccdc_cfg.bayer.config_params.alaw.enable = 1;
                        break;

                case V4L2_PIX_FMT_YUYV:
                case V4L2_PIX_FMT_UYVY:
                case V4L2_PIX_FMT_YUV420:
                case V4L2_PIX_FMT_NV12:
                case V4L2_PIX_FMT_RGB565X:
                        break;

                case V4L2_PIX_FMT_SBGGR16:
                default:
                        return -EINVAL;
                }
        } else {
                switch (pixfmt) {
                case V4L2_PIX_FMT_YUYV:
                        ccdc->ccdc_cfg.ycbcr.pix_order = CCDC_PIXORDER_YCBYCR;
                        break;

                case V4L2_PIX_FMT_UYVY:
                        ccdc->ccdc_cfg.ycbcr.pix_order = CCDC_PIXORDER_CBYCRY;
                        break;

                default:
                        return -EINVAL;
                }
        }

        return 0;
}

static u32 vpfe_ccdc_get_pixel_format(struct vpfe_ccdc *ccdc)
{
        u32 pixfmt;

        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER) {
                pixfmt = V4L2_PIX_FMT_YUYV;
        } else {
                if (ccdc->ccdc_cfg.ycbcr.pix_order == CCDC_PIXORDER_YCBYCR)
                        pixfmt = V4L2_PIX_FMT_YUYV;
                else
                        pixfmt = V4L2_PIX_FMT_UYVY;
        }

        return pixfmt;
}

static int
vpfe_ccdc_set_image_window(struct vpfe_ccdc *ccdc,
                           struct v4l2_rect *win, unsigned int bpp)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER) {
                ccdc->ccdc_cfg.bayer.win = *win;
                ccdc->ccdc_cfg.bayer.bytesperpixel = bpp;
                ccdc->ccdc_cfg.bayer.bytesperline = ALIGN(win->width * bpp, 32);
        } else {
                ccdc->ccdc_cfg.ycbcr.win = *win;
                ccdc->ccdc_cfg.ycbcr.bytesperpixel = bpp;
                ccdc->ccdc_cfg.ycbcr.bytesperline = ALIGN(win->width * bpp, 32);
        }

        return 0;
}

static inline void
vpfe_ccdc_get_image_window(struct vpfe_ccdc *ccdc,
                           struct v4l2_rect *win)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER)
                *win = ccdc->ccdc_cfg.bayer.win;
        else
                *win = ccdc->ccdc_cfg.ycbcr.win;
}

static inline unsigned int vpfe_ccdc_get_line_length(struct vpfe_ccdc *ccdc)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER)
                return ccdc->ccdc_cfg.bayer.bytesperline;

        return ccdc->ccdc_cfg.ycbcr.bytesperline;
}

static inline int
vpfe_ccdc_set_frame_format(struct vpfe_ccdc *ccdc,
                           enum ccdc_frmfmt frm_fmt)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER)
                ccdc->ccdc_cfg.bayer.frm_fmt = frm_fmt;
        else
                ccdc->ccdc_cfg.ycbcr.frm_fmt = frm_fmt;

        return 0;
}

static inline enum ccdc_frmfmt
vpfe_ccdc_get_frame_format(struct vpfe_ccdc *ccdc)
{
        if (ccdc->ccdc_cfg.if_type == VPFE_RAW_BAYER)
                return ccdc->ccdc_cfg.bayer.frm_fmt;

        return ccdc->ccdc_cfg.ycbcr.frm_fmt;
}

static inline int vpfe_ccdc_getfid(struct vpfe_ccdc *ccdc)
{
        return (vpfe_reg_read(ccdc, VPFE_SYNMODE) >> 15) & 1;
}

static inline void vpfe_set_sdr_addr(struct vpfe_ccdc *ccdc, unsigned long addr)
{
        vpfe_reg_write(ccdc, addr & 0xffffffe0, VPFE_SDR_ADDR);
}

static int vpfe_ccdc_set_hw_if_params(struct vpfe_ccdc *ccdc,
                                      struct vpfe_hw_if_param *params)
{
        struct vpfe_device *vpfe = container_of(ccdc, struct vpfe_device, ccdc);

        ccdc->ccdc_cfg.if_type = params->if_type;

        switch (params->if_type) {
        case VPFE_BT656:
        case VPFE_YCBCR_SYNC_16:
        case VPFE_YCBCR_SYNC_8:
        case VPFE_BT656_10BIT:
                ccdc->ccdc_cfg.ycbcr.vd_pol = params->vdpol;
                ccdc->ccdc_cfg.ycbcr.hd_pol = params->hdpol;
                break;

        case VPFE_RAW_BAYER:
                ccdc->ccdc_cfg.bayer.vd_pol = params->vdpol;
                ccdc->ccdc_cfg.bayer.hd_pol = params->hdpol;
                if (params->bus_width == 10)
                        ccdc->ccdc_cfg.bayer.config_params.data_sz =
                                VPFE_CCDC_DATA_10BITS;
                else
                        ccdc->ccdc_cfg.bayer.config_params.data_sz =
                                VPFE_CCDC_DATA_8BITS;
                vpfe_dbg(1, vpfe, "params.bus_width: %d\n",
                        params->bus_width);
                vpfe_dbg(1, vpfe, "config_params.data_sz: %d\n",
                        ccdc->ccdc_cfg.bayer.config_params.data_sz);
                break;

        default:
                return -EINVAL;
        }

        return 0;
}

static void vpfe_clear_intr(struct vpfe_ccdc *ccdc, int vdint)
{
        unsigned int vpfe_int_status;

        vpfe_int_status = vpfe_reg_read(ccdc, VPFE_IRQ_STS);

        switch (vdint) {
        /* VD0 interrupt */
        case VPFE_VDINT0:
                vpfe_int_status &= ~VPFE_VDINT0;
                vpfe_int_status |= VPFE_VDINT0;
                break;

        /* VD1 interrupt */
        case VPFE_VDINT1:
                vpfe_int_status &= ~VPFE_VDINT1;
                vpfe_int_status |= VPFE_VDINT1;
                break;

        /* VD2 interrupt */
        case VPFE_VDINT2:
                vpfe_int_status &= ~VPFE_VDINT2;
                vpfe_int_status |= VPFE_VDINT2;
                break;

        /* Clear all interrupts */
        default:
                vpfe_int_status &= ~(VPFE_VDINT0 |
                                VPFE_VDINT1 |
                                VPFE_VDINT2);
                vpfe_int_status |= (VPFE_VDINT0 |
                                VPFE_VDINT1 |
                                VPFE_VDINT2);
                break;
        }
        /* Clear specific VDINT from the status register */
        vpfe_reg_write(ccdc, vpfe_int_status, VPFE_IRQ_STS);

        vpfe_int_status = vpfe_reg_read(ccdc, VPFE_IRQ_STS);

        /* Acknowledge that we are done with all interrupts */
        vpfe_reg_write(ccdc, 1, VPFE_IRQ_EOI);
}

static void vpfe_ccdc_config_defaults(struct vpfe_ccdc *ccdc)
{
        ccdc->ccdc_cfg.if_type = VPFE_RAW_BAYER;

        ccdc->ccdc_cfg.ycbcr.pix_fmt = CCDC_PIXFMT_YCBCR_8BIT;
        ccdc->ccdc_cfg.ycbcr.frm_fmt = CCDC_FRMFMT_INTERLACED;
        ccdc->ccdc_cfg.ycbcr.fid_pol = VPFE_PINPOL_POSITIVE;
        ccdc->ccdc_cfg.ycbcr.vd_pol = VPFE_PINPOL_POSITIVE;
        ccdc->ccdc_cfg.ycbcr.hd_pol = VPFE_PINPOL_POSITIVE;
        ccdc->ccdc_cfg.ycbcr.pix_order = CCDC_PIXORDER_CBYCRY;
        ccdc->ccdc_cfg.ycbcr.buf_type = CCDC_BUFTYPE_FLD_INTERLEAVED;

        ccdc->ccdc_cfg.ycbcr.win.left = 0;
        ccdc->ccdc_cfg.ycbcr.win.top = 0;
        ccdc->ccdc_cfg.ycbcr.win.width = 720;
        ccdc->ccdc_cfg.ycbcr.win.height = 576;
        ccdc->ccdc_cfg.ycbcr.bt656_enable = 1;

        ccdc->ccdc_cfg.bayer.pix_fmt = CCDC_PIXFMT_RAW;
        ccdc->ccdc_cfg.bayer.frm_fmt = CCDC_FRMFMT_PROGRESSIVE;
        ccdc->ccdc_cfg.bayer.fid_pol = VPFE_PINPOL_POSITIVE;
        ccdc->ccdc_cfg.bayer.vd_pol = VPFE_PINPOL_POSITIVE;
        ccdc->ccdc_cfg.bayer.hd_pol = VPFE_PINPOL_POSITIVE;

        ccdc->ccdc_cfg.bayer.win.left = 0;
        ccdc->ccdc_cfg.bayer.win.top = 0;
        ccdc->ccdc_cfg.bayer.win.width = 800;
        ccdc->ccdc_cfg.bayer.win.height = 600;
        ccdc->ccdc_cfg.bayer.config_params.data_sz = VPFE_CCDC_DATA_8BITS;

        ccdc->ccdc_cfg.bayer.config_params.alaw.gamma_wd =
                                                VPFE_CCDC_GAMMA_BITS_09_0;
}

/*
 * vpfe_get_ccdc_image_format - Get image parameters based on CCDC settings
 */
static int vpfe_get_ccdc_image_format(struct vpfe_device *vpfe,
                                      struct v4l2_format *f)
{
        struct v4l2_rect image_win;
        enum ccdc_buftype buf_type;
        enum ccdc_frmfmt frm_fmt;

        memset(f, 0, sizeof(*f));
        f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        vpfe_ccdc_get_image_window(&vpfe->ccdc, &image_win);
        f->fmt.pix.width = image_win.width;
        f->fmt.pix.height = image_win.height;
        f->fmt.pix.bytesperline = vpfe_ccdc_get_line_length(&vpfe->ccdc);
        f->fmt.pix.sizeimage = f->fmt.pix.bytesperline *
                                f->fmt.pix.height;
        buf_type = vpfe_ccdc_get_buftype(&vpfe->ccdc);
        f->fmt.pix.pixelformat = vpfe_ccdc_get_pixel_format(&vpfe->ccdc);
        frm_fmt = vpfe_ccdc_get_frame_format(&vpfe->ccdc);

        if (frm_fmt == CCDC_FRMFMT_PROGRESSIVE) {
                f->fmt.pix.field = V4L2_FIELD_NONE;
        } else if (frm_fmt == CCDC_FRMFMT_INTERLACED) {
                if (buf_type == CCDC_BUFTYPE_FLD_INTERLEAVED) {
                        f->fmt.pix.field = V4L2_FIELD_INTERLACED;
                 } else if (buf_type == CCDC_BUFTYPE_FLD_SEPARATED) {
                        f->fmt.pix.field = V4L2_FIELD_SEQ_TB;
                } else {
                        vpfe_err(vpfe, "Invalid buf_type\n");
                        return -EINVAL;
                }
        } else {
                vpfe_err(vpfe, "Invalid frm_fmt\n");
                return -EINVAL;
        }
        return 0;
}

static int vpfe_config_ccdc_image_format(struct vpfe_device *vpfe)
{
        enum ccdc_frmfmt frm_fmt = CCDC_FRMFMT_INTERLACED;
        int ret;

        vpfe_dbg(2, vpfe, "vpfe_config_ccdc_image_format\n");

        vpfe_dbg(1, vpfe, "pixelformat: %s\n",
                print_fourcc(vpfe->fmt.fmt.pix.pixelformat));

        if (vpfe_ccdc_set_pixel_format(&vpfe->ccdc,
                        vpfe->fmt.fmt.pix.pixelformat) < 0) {
                vpfe_err(vpfe, "couldn't set pix format in ccdc\n");
                return -EINVAL;
        }

        /* configure the image window */
        vpfe_ccdc_set_image_window(&vpfe->ccdc, &vpfe->crop, vpfe->bpp);

        switch (vpfe->fmt.fmt.pix.field) {
        case V4L2_FIELD_INTERLACED:
                /* do nothing, since it is default */
                ret = vpfe_ccdc_set_buftype(
                                &vpfe->ccdc,
                                CCDC_BUFTYPE_FLD_INTERLEAVED);
                break;

        case V4L2_FIELD_NONE:
                frm_fmt = CCDC_FRMFMT_PROGRESSIVE;
                /* buffer type only applicable for interlaced scan */
                break;

        case V4L2_FIELD_SEQ_TB:
                ret = vpfe_ccdc_set_buftype(
                                &vpfe->ccdc,
                                CCDC_BUFTYPE_FLD_SEPARATED);
                break;

        default:
                return -EINVAL;
        }

        if (ret)
                return ret;

        return vpfe_ccdc_set_frame_format(&vpfe->ccdc, frm_fmt);
}

/*
 * vpfe_config_image_format()
 * For a given standard, this functions sets up the default
 * pix format & crop values in the vpfe device and ccdc.  It first
 * starts with defaults based values from the standard table.
 * It then checks if sub device support g_mbus_fmt and then override the
 * values based on that.Sets crop values to match with scan resolution
 * starting at 0,0. It calls vpfe_config_ccdc_image_format() set the
 * values in ccdc
 */
static int vpfe_config_image_format(struct vpfe_device *vpfe,
                                    v4l2_std_id std_id)
{
        struct v4l2_pix_format *pix = &vpfe->fmt.fmt.pix;
        int i, ret;

        for (i = 0; i < ARRAY_SIZE(vpfe_standards); i++) {
                if (vpfe_standards[i].std_id & std_id) {
                        vpfe->std_info.active_pixels =
                                        vpfe_standards[i].width;
                        vpfe->std_info.active_lines =
                                        vpfe_standards[i].height;
                        vpfe->std_info.frame_format =
                                        vpfe_standards[i].frame_format;
                        vpfe->std_index = i;

                        break;
                }
        }

        if (i ==  ARRAY_SIZE(vpfe_standards)) {
                vpfe_err(vpfe, "standard not supported\n");
                return -EINVAL;
        }

        vpfe->crop.top = vpfe->crop.left = 0;
        vpfe->crop.width = vpfe->std_info.active_pixels;
        vpfe->crop.height = vpfe->std_info.active_lines;
        pix->width = vpfe->crop.width;
        pix->height = vpfe->crop.height;
        pix->pixelformat = V4L2_PIX_FMT_YUYV;

        /* first field and frame format based on standard frame format */
        if (vpfe->std_info.frame_format)
                pix->field = V4L2_FIELD_INTERLACED;
        else
                pix->field = V4L2_FIELD_NONE;

        ret = __vpfe_get_format(vpfe, &vpfe->fmt, &vpfe->bpp);
        if (ret)
                return ret;

        /* Update the crop window based on found values */
        vpfe->crop.width = pix->width;
        vpfe->crop.height = pix->height;

        return vpfe_config_ccdc_image_format(vpfe);
}

static int vpfe_initialize_device(struct vpfe_device *vpfe)
{
        struct vpfe_subdev_info *sdinfo;
        int ret;

        sdinfo = &vpfe->cfg->sub_devs[0];
        sdinfo->sd = vpfe->sd[0];
        vpfe->current_input = 0;
        vpfe->std_index = 0;
        /* Configure the default format information */
        ret = vpfe_config_image_format(vpfe,
                                       vpfe_standards[vpfe->std_index].std_id);
        if (ret)
                return ret;

        pm_runtime_get_sync(vpfe->pdev);

        vpfe_config_enable(&vpfe->ccdc, 1);

        vpfe_ccdc_restore_defaults(&vpfe->ccdc);

        /* Clear all VPFE interrupts */
        vpfe_clear_intr(&vpfe->ccdc, -1);

        return ret;
}

/*
 * vpfe_release : This function is based on the vb2_fop_release
 * helper function.
 * It has been augmented to handle module power management,
 * by disabling/enabling h/w module fcntl clock when necessary.
 */
static int vpfe_release(struct file *file)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        int ret;

        mutex_lock(&vpfe->lock);

        if (v4l2_fh_is_singular_file(file))
                vpfe_ccdc_close(&vpfe->ccdc, vpfe->pdev);
        ret = _vb2_fop_release(file, NULL);

        mutex_unlock(&vpfe->lock);

        return ret;
}

/*
 * vpfe_open : This function is based on the v4l2_fh_open helper function.
 * It has been augmented to handle module power management,
 * by disabling/enabling h/w module fcntl clock when necessary.
 */
static int vpfe_open(struct file *file)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        int ret;

        mutex_lock(&vpfe->lock);

        ret = v4l2_fh_open(file);
        if (ret) {
                vpfe_err(vpfe, "v4l2_fh_open failed\n");
                goto unlock;
        }

        if (!v4l2_fh_is_singular_file(file))
                goto unlock;

        if (vpfe_initialize_device(vpfe)) {
                v4l2_fh_release(file);
                ret = -ENODEV;
        }

unlock:
        mutex_unlock(&vpfe->lock);
        return ret;
}

/**
 * vpfe_schedule_next_buffer: set next buffer address for capture
 * @vpfe : ptr to vpfe device
 *
 * This function will get next buffer from the dma queue and
 * set the buffer address in the vpfe register for capture.
 * the buffer is marked active
 *
 * Assumes caller is holding vpfe->dma_queue_lock already
 */
static inline void vpfe_schedule_next_buffer(struct vpfe_device *vpfe)
{
        vpfe->next_frm = list_entry(vpfe->dma_queue.next,
                                    struct vpfe_cap_buffer, list);
        list_del(&vpfe->next_frm->list);

        vpfe_set_sdr_addr(&vpfe->ccdc,
                       vb2_dma_contig_plane_dma_addr(&vpfe->next_frm->vb, 0));
}

static inline void vpfe_schedule_bottom_field(struct vpfe_device *vpfe)
{
        unsigned long addr;

        addr = vb2_dma_contig_plane_dma_addr(&vpfe->next_frm->vb, 0) +
                                        vpfe->field_off;

        vpfe_set_sdr_addr(&vpfe->ccdc, addr);
}

/*
 * vpfe_process_buffer_complete: process a completed buffer
 * @vpfe : ptr to vpfe device
 *
 * This function time stamp the buffer and mark it as DONE. It also
 * wake up any process waiting on the QUEUE and set the next buffer
 * as current
 */
static inline void vpfe_process_buffer_complete(struct vpfe_device *vpfe)
{
        v4l2_get_timestamp(&vpfe->cur_frm->vb.v4l2_buf.timestamp);
        vpfe->cur_frm->vb.v4l2_buf.field = vpfe->fmt.fmt.pix.field;
        vpfe->cur_frm->vb.v4l2_buf.sequence = vpfe->sequence++;
        vb2_buffer_done(&vpfe->cur_frm->vb, VB2_BUF_STATE_DONE);
        vpfe->cur_frm = vpfe->next_frm;
}

/*
 * vpfe_isr : ISR handler for vpfe capture (VINT0)
 * @irq: irq number
 * @dev_id: dev_id ptr
 *
 * It changes status of the captured buffer, takes next buffer from the queue
 * and sets its address in VPFE registers
 */
static irqreturn_t vpfe_isr(int irq, void *dev)
{
        struct vpfe_device *vpfe = (struct vpfe_device *)dev;
        enum v4l2_field field;
        int intr_status;
        int fid;

        intr_status = vpfe_reg_read(&vpfe->ccdc, VPFE_IRQ_STS);

        if (intr_status & VPFE_VDINT0) {
                field = vpfe->fmt.fmt.pix.field;

                if (field == V4L2_FIELD_NONE) {
                        /* handle progressive frame capture */
                        if (vpfe->cur_frm != vpfe->next_frm)
                                vpfe_process_buffer_complete(vpfe);
                        goto next_intr;
                }

                /* interlaced or TB capture check which field
                   we are in hardware */
                fid = vpfe_ccdc_getfid(&vpfe->ccdc);

                /* switch the software maintained field id */
                vpfe->field ^= 1;
                if (fid == vpfe->field) {
                        /* we are in-sync here,continue */
                        if (fid == 0) {
                                /*
                                 * One frame is just being captured. If the
                                 * next frame is available, release the
                                 * current frame and move on
                                 */
                                if (vpfe->cur_frm != vpfe->next_frm)
                                        vpfe_process_buffer_complete(vpfe);
                                /*
                                 * based on whether the two fields are stored
                                 * interleave or separately in memory,
                                 * reconfigure the CCDC memory address
                                 */
                                if (field == V4L2_FIELD_SEQ_TB)
                                        vpfe_schedule_bottom_field(vpfe);

                                goto next_intr;
                        }
                        /*
                         * if one field is just being captured configure
                         * the next frame get the next frame from the empty
                         * queue if no frame is available hold on to the
                         * current buffer
                         */
                        spin_lock(&vpfe->dma_queue_lock);
                        if (!list_empty(&vpfe->dma_queue) &&
                            vpfe->cur_frm == vpfe->next_frm)
                                vpfe_schedule_next_buffer(vpfe);
                        spin_unlock(&vpfe->dma_queue_lock);
                } else if (fid == 0) {
                        /*
                         * out of sync. Recover from any hardware out-of-sync.
                         * May loose one frame
                         */
                        vpfe->field = fid;
                }
        }

next_intr:
        if (intr_status & VPFE_VDINT1) {
                spin_lock(&vpfe->dma_queue_lock);
                if (vpfe->fmt.fmt.pix.field == V4L2_FIELD_NONE &&
                    !list_empty(&vpfe->dma_queue) &&
                    vpfe->cur_frm == vpfe->next_frm)
                        vpfe_schedule_next_buffer(vpfe);
                spin_unlock(&vpfe->dma_queue_lock);
        }

        vpfe_clear_intr(&vpfe->ccdc, intr_status);

        return IRQ_HANDLED;
}

static inline void vpfe_detach_irq(struct vpfe_device *vpfe)
{
        unsigned int intr = VPFE_VDINT0;
        enum ccdc_frmfmt frame_format;

        frame_format = vpfe_ccdc_get_frame_format(&vpfe->ccdc);
        if (frame_format == CCDC_FRMFMT_PROGRESSIVE)
                intr |= VPFE_VDINT1;

        vpfe_reg_write(&vpfe->ccdc, intr, VPFE_IRQ_EN_CLR);
}

static inline void vpfe_attach_irq(struct vpfe_device *vpfe)
{
        unsigned int intr = VPFE_VDINT0;
        enum ccdc_frmfmt frame_format;

        frame_format = vpfe_ccdc_get_frame_format(&vpfe->ccdc);
        if (frame_format == CCDC_FRMFMT_PROGRESSIVE)
                intr |= VPFE_VDINT1;

        vpfe_reg_write(&vpfe->ccdc, intr, VPFE_IRQ_EN_SET);
}

static int vpfe_querycap(struct file *file, void  *priv,
                         struct v4l2_capability *cap)
{
        struct vpfe_device *vpfe = video_drvdata(file);

        vpfe_dbg(2, vpfe, "vpfe_querycap\n");

        strlcpy(cap->driver, VPFE_MODULE_NAME, sizeof(cap->driver));
        strlcpy(cap->card, "TI AM437x VPFE", sizeof(cap->card));
        snprintf(cap->bus_info, sizeof(cap->bus_info),
                        "platform:%s", vpfe->v4l2_dev.name);
        cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
                            V4L2_CAP_READWRITE;
        cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;

        return 0;
}

/* get the format set at output pad of the adjacent subdev */
static int __vpfe_get_format(struct vpfe_device *vpfe,
                             struct v4l2_format *format, unsigned int *bpp)
{
        struct v4l2_mbus_framefmt mbus_fmt;
        struct vpfe_subdev_info *sdinfo;
        struct v4l2_subdev_format fmt;
        int ret;

        sdinfo = vpfe->current_subdev;
        if (!sdinfo->sd)
                return -EINVAL;

        fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
        fmt.pad = 0;

        ret = v4l2_subdev_call(sdinfo->sd, pad, get_fmt, NULL, &fmt);
        if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV)
                return ret;

        if (!ret) {
                v4l2_fill_pix_format(&format->fmt.pix, &fmt.format);
                mbus_to_pix(vpfe, &fmt.format, &format->fmt.pix, bpp);
        } else {
                ret = v4l2_device_call_until_err(&vpfe->v4l2_dev,
                                                 sdinfo->grp_id,
                                                 video, g_mbus_fmt,
                                                 &mbus_fmt);
                if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV)
                        return ret;
                v4l2_fill_pix_format(&format->fmt.pix, &mbus_fmt);
                mbus_to_pix(vpfe, &mbus_fmt, &format->fmt.pix, bpp);
        }

        format->type = vpfe->fmt.type;

        vpfe_dbg(1, vpfe,
                 "%s size %dx%d (%s) bytesperline = %d, size = %d, bpp = %d\n",
                 __func__, format->fmt.pix.width, format->fmt.pix.height,
                 print_fourcc(format->fmt.pix.pixelformat),
                 format->fmt.pix.bytesperline, format->fmt.pix.sizeimage, *bpp);

        return 0;
}

/* set the format at output pad of the adjacent subdev */
static int __vpfe_set_format(struct vpfe_device *vpfe,
                             struct v4l2_format *format, unsigned int *bpp)
{
        struct v4l2_mbus_framefmt mbus_fmt;
        struct vpfe_subdev_info *sdinfo;
        struct v4l2_subdev_format fmt;
        int ret;

        vpfe_dbg(2, vpfe, "__vpfe_set_format\n");

        sdinfo = vpfe->current_subdev;
        if (!sdinfo->sd)
                return -EINVAL;

        fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
        fmt.pad = 0;

        pix_to_mbus(vpfe, &format->fmt.pix, &fmt.format);

        ret = v4l2_subdev_call(sdinfo->sd, pad, set_fmt, NULL, &fmt);
        if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV)
                return ret;

        if (!ret) {
                v4l2_fill_pix_format(&format->fmt.pix, &fmt.format);
                mbus_to_pix(vpfe, &fmt.format, &format->fmt.pix, bpp);
        } else {
                ret = v4l2_device_call_until_err(&vpfe->v4l2_dev,
                                                 sdinfo->grp_id,
                                                 video, s_mbus_fmt,
                                                 &mbus_fmt);
                if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV)
                        return ret;

                v4l2_fill_pix_format(&format->fmt.pix, &mbus_fmt);
                mbus_to_pix(vpfe, &mbus_fmt, &format->fmt.pix, bpp);
        }

        format->type = vpfe->fmt.type;

        vpfe_dbg(1, vpfe,
                 "%s size %dx%d (%s) bytesperline = %d, size = %d, bpp = %d\n",
                 __func__,  format->fmt.pix.width, format->fmt.pix.height,
                 print_fourcc(format->fmt.pix.pixelformat),
                 format->fmt.pix.bytesperline, format->fmt.pix.sizeimage, *bpp);

        return 0;
}

static int vpfe_g_fmt(struct file *file, void *priv,
                      struct v4l2_format *fmt)
{
        struct vpfe_device *vpfe = video_drvdata(file);

        vpfe_dbg(2, vpfe, "vpfe_g_fmt\n");

        *fmt = vpfe->fmt;

        return 0;
}

static int vpfe_enum_fmt(struct file *file, void  *priv,
                         struct v4l2_fmtdesc *f)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;
        struct vpfe_fmt *fmt = NULL;
        unsigned int k;

        vpfe_dbg(2, vpfe, "vpfe_enum_format index:%d\n",
                f->index);

        sdinfo = vpfe->current_subdev;
        if (!sdinfo->sd)
                return -EINVAL;

        if (f->index > ARRAY_SIZE(formats))
                return -EINVAL;

        for (k = 0; k < ARRAY_SIZE(formats); k++) {
                if (formats[k].index == f->index) {
                        fmt = &formats[k];
                        break;
                }
        }
        if (!fmt)
                return -EINVAL;

        strncpy(f->description, fmt->name, sizeof(f->description) - 1);
        f->pixelformat = fmt->fourcc;
        f->type = vpfe->fmt.type;

        vpfe_dbg(1, vpfe, "vpfe_enum_format: mbus index: %d code: %x pixelformat: %s [%s]\n",
                f->index, fmt->code, print_fourcc(fmt->fourcc), fmt->name);

        return 0;
}

static int vpfe_try_fmt(struct file *file, void *priv,
                        struct v4l2_format *fmt)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        unsigned int bpp;

        vpfe_dbg(2, vpfe, "vpfe_try_fmt\n");

        return __vpfe_get_format(vpfe, fmt, &bpp);
}

static int vpfe_s_fmt(struct file *file, void *priv,
                      struct v4l2_format *fmt)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct v4l2_format format;
        unsigned int bpp;
        int ret;

        vpfe_dbg(2, vpfe, "vpfe_s_fmt\n");

        /* If streaming is started, return error */
        if (vb2_is_busy(&vpfe->buffer_queue)) {
                vpfe_err(vpfe, "%s device busy\n", __func__);
                return -EBUSY;
        }

        ret = vpfe_try_fmt(file, priv, fmt);
        if (ret)
                return ret;


        if (!cmp_v4l2_format(fmt, &format)) {
                /* Sensor format is different from the requested format
                 * so we need to change it
                 */
                ret = __vpfe_set_format(vpfe, fmt, &bpp);
                if (ret)
                        return ret;
        } else /* Just make sure all of the fields are consistent */
                *fmt = format;

        /* First detach any IRQ if currently attached */
        vpfe_detach_irq(vpfe);
        vpfe->fmt = *fmt;
        vpfe->bpp = bpp;

        /* Update the crop window based on found values */
        vpfe->crop.width = fmt->fmt.pix.width;
        vpfe->crop.height = fmt->fmt.pix.height;

        /* set image capture parameters in the ccdc */
        return vpfe_config_ccdc_image_format(vpfe);
}

static int vpfe_enum_size(struct file *file, void  *priv,
                          struct v4l2_frmsizeenum *fsize)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct v4l2_subdev_frame_size_enum fse;
        struct vpfe_subdev_info *sdinfo;
        struct v4l2_mbus_framefmt mbus;
        struct v4l2_pix_format pix;
        struct vpfe_fmt *fmt;
        int ret;

        vpfe_dbg(2, vpfe, "vpfe_enum_size\n");

        /* check for valid format */
        fmt = find_format_by_pix(fsize->pixel_format);
        if (!fmt) {
                vpfe_dbg(3, vpfe, "Invalid pixel code: %x, default used instead\n",
                        fsize->pixel_format);
                return -EINVAL;
        }

        memset(fsize->reserved, 0x0, sizeof(fsize->reserved));

        sdinfo = vpfe->current_subdev;
        if (!sdinfo->sd)
                return -EINVAL;

        memset(&pix, 0x0, sizeof(pix));
        /* Construct pix from parameter and use default for the rest */
        pix.pixelformat = fsize->pixel_format;
        pix.width = 640;
        pix.height = 480;
        pix.colorspace = V4L2_COLORSPACE_SRGB;
        pix.field = V4L2_FIELD_NONE;
        pix_to_mbus(vpfe, &pix, &mbus);

        memset(&fse, 0x0, sizeof(fse));
        fse.index = fsize->index;
        fse.pad = 0;
        fse.code = mbus.code;
        fse.which = V4L2_SUBDEV_FORMAT_ACTIVE;
        ret = v4l2_subdev_call(sdinfo->sd, pad, enum_frame_size, NULL, &fse);
        if (ret)
                return -EINVAL;

        vpfe_dbg(1, vpfe, "vpfe_enum_size: index: %d code: %x W:[%d,%d] H:[%d,%d]\n",
                fse.index, fse.code, fse.min_width, fse.max_width,
                fse.min_height, fse.max_height);

        fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
        fsize->discrete.width = fse.max_width;
        fsize->discrete.height = fse.max_height;

        vpfe_dbg(1, vpfe, "vpfe_enum_size: index: %d pixformat: %s size: %dx%d\n",
                fsize->index, print_fourcc(fsize->pixel_format),
                fsize->discrete.width, fsize->discrete.height);

        return 0;
}

/*
 * vpfe_get_subdev_input_index - Get subdev index and subdev input index for a
 * given app input index
 */
static int
vpfe_get_subdev_input_index(struct vpfe_device *vpfe,
                            int *subdev_index,
                            int *subdev_input_index,
                            int app_input_index)
{
        struct vpfe_config *cfg = vpfe->cfg;
        struct vpfe_subdev_info *sdinfo;
        int i, j = 0;

        for (i = 0; i < ARRAY_SIZE(vpfe->cfg->asd); i++) {
                sdinfo = &cfg->sub_devs[i];
                if (app_input_index < (j + 1)) {
                        *subdev_index = i;
                        *subdev_input_index = app_input_index - j;
                        return 0;
                }
                j++;
        }
        return -EINVAL;
}

/*
 * vpfe_get_app_input - Get app input index for a given subdev input index
 * driver stores the input index of the current sub device and translate it
 * when application request the current input
 */
static int vpfe_get_app_input_index(struct vpfe_device *vpfe,
                                    int *app_input_index)
{
        struct vpfe_config *cfg = vpfe->cfg;
        struct vpfe_subdev_info *sdinfo;
        struct i2c_client *client;
        struct i2c_client *curr_client;
        int i, j = 0;

        curr_client = v4l2_get_subdevdata(vpfe->current_subdev->sd);
        for (i = 0; i < ARRAY_SIZE(vpfe->cfg->asd); i++) {
                sdinfo = &cfg->sub_devs[i];
                client = v4l2_get_subdevdata(sdinfo->sd);
                if (client->addr == curr_client->addr &&
                    client->adapter->nr == client->adapter->nr) {
                        if (vpfe->current_input >= 1)
                                return -1;
                        *app_input_index = j + vpfe->current_input;
                        return 0;
                }
                j++;
        }
        return -EINVAL;
}

static int vpfe_enum_input(struct file *file, void *priv,
                           struct v4l2_input *inp)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;
        int subdev, index;

        vpfe_dbg(2, vpfe, "vpfe_enum_input\n");

        if (vpfe_get_subdev_input_index(vpfe, &subdev, &index,
                                        inp->index) < 0) {
                vpfe_dbg(1, vpfe,
                        "input information not found for the subdev\n");
                return -EINVAL;
        }
        sdinfo = &vpfe->cfg->sub_devs[subdev];
        *inp = sdinfo->inputs[index];

        return 0;
}

static int vpfe_g_input(struct file *file, void *priv, unsigned int *index)
{
        struct vpfe_device *vpfe = video_drvdata(file);

        vpfe_dbg(2, vpfe, "vpfe_g_input\n");

        return vpfe_get_app_input_index(vpfe, index);
}

/* Assumes caller is holding vpfe_dev->lock */
static int vpfe_set_input(struct vpfe_device *vpfe, unsigned int index)
{
        int subdev_index = 0, inp_index = 0;
        struct vpfe_subdev_info *sdinfo;
        struct vpfe_route *route;
        u32 input, output;
        int ret;

        vpfe_dbg(2, vpfe, "vpfe_set_input: index: %d\n", index);

        /* If streaming is started, return error */
        if (vb2_is_busy(&vpfe->buffer_queue)) {
                vpfe_err(vpfe, "%s device busy\n", __func__);
                return -EBUSY;
        }
        ret = vpfe_get_subdev_input_index(vpfe,
                                          &subdev_index,
                                          &inp_index,
                                          index);
        if (ret < 0) {
                vpfe_err(vpfe, "invalid input index: %d\n", index);
                goto get_out;
        }

        sdinfo = &vpfe->cfg->sub_devs[subdev_index];
        sdinfo->sd = vpfe->sd[subdev_index];
        route = &sdinfo->routes[inp_index];
        if (route && sdinfo->can_route) {
                input = route->input;
                output = route->output;
                if (sdinfo->sd) {
                        ret = v4l2_subdev_call(sdinfo->sd, video,
                                        s_routing, input, output, 0);
                        if (ret) {
                                vpfe_err(vpfe, "s_routing failed\n");
                                ret = -EINVAL;
                                goto get_out;
                        }
                }

        }

        vpfe->current_subdev = sdinfo;
        if (sdinfo->sd)
                vpfe->v4l2_dev.ctrl_handler = sdinfo->sd->ctrl_handler;
        vpfe->current_input = index;
        vpfe->std_index = 0;

        /* set the bus/interface parameter for the sub device in ccdc */
        ret = vpfe_ccdc_set_hw_if_params(&vpfe->ccdc, &sdinfo->vpfe_param);
        if (ret)
                return ret;

        /* set the default image parameters in the device */
        return vpfe_config_image_format(vpfe,
                                        vpfe_standards[vpfe->std_index].std_id);

get_out:
        return ret;
}

static int vpfe_s_input(struct file *file, void *priv, unsigned int index)
{
        struct vpfe_device *vpfe = video_drvdata(file);

        vpfe_dbg(2, vpfe,
                "vpfe_s_input: index: %d\n", index);

        return vpfe_set_input(vpfe, index);
}

static int vpfe_querystd(struct file *file, void *priv, v4l2_std_id *std_id)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;

        vpfe_dbg(2, vpfe, "vpfe_querystd\n");

        sdinfo = vpfe->current_subdev;
        if (!(sdinfo->inputs[0].capabilities & V4L2_IN_CAP_STD))
                return -ENODATA;

        /* Call querystd function of decoder device */
        return v4l2_device_call_until_err(&vpfe->v4l2_dev, sdinfo->grp_id,
                                         video, querystd, std_id);
}

static int vpfe_s_std(struct file *file, void *priv, v4l2_std_id std_id)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;
        int ret;

        vpfe_dbg(2, vpfe, "vpfe_s_std\n");

        sdinfo = vpfe->current_subdev;
        if (!(sdinfo->inputs[0].capabilities & V4L2_IN_CAP_STD))
                return -ENODATA;

        /* If streaming is started, return error */
        if (vb2_is_busy(&vpfe->buffer_queue)) {
                vpfe_err(vpfe, "%s device busy\n", __func__);
                ret = -EBUSY;
                return ret;
        }

        ret = v4l2_device_call_until_err(&vpfe->v4l2_dev, sdinfo->grp_id,
                                         video, s_std, std_id);
        if (ret < 0) {
                vpfe_err(vpfe, "Failed to set standard\n");
                return ret;
        }
        ret = vpfe_config_image_format(vpfe, std_id);

        return ret;
}

static int vpfe_g_std(struct file *file, void *priv, v4l2_std_id *std_id)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct vpfe_subdev_info *sdinfo;

        vpfe_dbg(2, vpfe, "vpfe_g_std\n");

        sdinfo = vpfe->current_subdev;
        if (sdinfo->inputs[0].capabilities != V4L2_IN_CAP_STD)
                return -ENODATA;

        *std_id = vpfe_standards[vpfe->std_index].std_id;

        return 0;
}

/*
 * vpfe_calculate_offsets : This function calculates buffers offset
 * for top and bottom field
 */
static void vpfe_calculate_offsets(struct vpfe_device *vpfe)
{
        struct v4l2_rect image_win;

        vpfe_dbg(2, vpfe, "vpfe_calculate_offsets\n");

        vpfe_ccdc_get_image_window(&vpfe->ccdc, &image_win);
        vpfe->field_off = image_win.height * image_win.width;
}

/*
 * vpfe_queue_setup - Callback function for buffer setup.
 * @vq: vb2_queue ptr
 * @fmt: v4l2 format
 * @nbuffers: ptr to number of buffers requested by application
 * @nplanes:: contains number of distinct video planes needed to hold a frame
 * @sizes[]: contains the size (in bytes) of each plane.
 * @alloc_ctxs: ptr to allocation context
 *
 * This callback function is called when reqbuf() is called to adjust
 * the buffer count and buffer size
 */
static int vpfe_queue_setup(struct vb2_queue *vq,
                            const struct v4l2_format *fmt,
                            unsigned int *nbuffers, unsigned int *nplanes,
                            unsigned int sizes[], void *alloc_ctxs[])
{
        struct vpfe_device *vpfe = vb2_get_drv_priv(vq);

        if (fmt && fmt->fmt.pix.sizeimage < vpfe->fmt.fmt.pix.sizeimage)
                return -EINVAL;

        if (vq->num_buffers + *nbuffers < 3)
                *nbuffers = 3 - vq->num_buffers;

        *nplanes = 1;
        sizes[0] = fmt ? fmt->fmt.pix.sizeimage : vpfe->fmt.fmt.pix.sizeimage;
        alloc_ctxs[0] = vpfe->alloc_ctx;

        vpfe_dbg(1, vpfe,
                "nbuffers=%d, size=%u\n", *nbuffers, sizes[0]);

        /* Calculate field offset */
        vpfe_calculate_offsets(vpfe);

        return 0;
}

/*
 * vpfe_buffer_prepare :  callback function for buffer prepare
 * @vb: ptr to vb2_buffer
 *
 * This is the callback function for buffer prepare when vb2_qbuf()
 * function is called. The buffer is prepared and user space virtual address
 * or user address is converted into  physical address
 */
static int vpfe_buffer_prepare(struct vb2_buffer *vb)
{
        struct vpfe_device *vpfe = vb2_get_drv_priv(vb->vb2_queue);

        vb2_set_plane_payload(vb, 0, vpfe->fmt.fmt.pix.sizeimage);

        if (vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0))
                return -EINVAL;

        vb->v4l2_buf.field = vpfe->fmt.fmt.pix.field;

        return 0;
}

/*
 * vpfe_buffer_queue : Callback function to add buffer to DMA queue
 * @vb: ptr to vb2_buffer
 */
static void vpfe_buffer_queue(struct vb2_buffer *vb)
{
        struct vpfe_device *vpfe = vb2_get_drv_priv(vb->vb2_queue);
        struct vpfe_cap_buffer *buf = to_vpfe_buffer(vb);
        unsigned long flags = 0;

        /* add the buffer to the DMA queue */
        spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
        list_add_tail(&buf->list, &vpfe->dma_queue);
        spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
}

/*
 * vpfe_start_streaming : Starts the DMA engine for streaming
 * @vb: ptr to vb2_buffer
 * @count: number of buffers
 */
static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
{
        struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
        struct vpfe_cap_buffer *buf, *tmp;
        struct vpfe_subdev_info *sdinfo;
        unsigned long flags;
        unsigned long addr;
        int ret;

        spin_lock_irqsave(&vpfe->dma_queue_lock, flags);

        vpfe->field = 0;
        vpfe->sequence = 0;

        sdinfo = vpfe->current_subdev;

        vpfe_attach_irq(vpfe);

        if (vpfe->ccdc.ccdc_cfg.if_type == VPFE_RAW_BAYER)
                vpfe_ccdc_config_raw(&vpfe->ccdc);
        else
                vpfe_ccdc_config_ycbcr(&vpfe->ccdc);

        /* Get the next frame from the buffer queue */
        vpfe->next_frm = list_entry(vpfe->dma_queue.next,
                                    struct vpfe_cap_buffer, list);
        vpfe->cur_frm = vpfe->next_frm;
        /* Remove buffer from the buffer queue */
        list_del(&vpfe->cur_frm->list);
        spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);

        addr = vb2_dma_contig_plane_dma_addr(&vpfe->cur_frm->vb, 0);

        vpfe_set_sdr_addr(&vpfe->ccdc, (unsigned long)(addr));

        vpfe_pcr_enable(&vpfe->ccdc, 1);

        ret = v4l2_subdev_call(sdinfo->sd, video, s_stream, 1);
        if (ret < 0) {
                vpfe_err(vpfe, "Error in attaching interrupt handle\n");
                goto err;
        }

        return 0;

err:
        list_for_each_entry_safe(buf, tmp, &vpfe->dma_queue, list) {
                list_del(&buf->list);
                vb2_buffer_done(&buf->vb, VB2_BUF_STATE_QUEUED);
        }

        return ret;
}

/*
 * vpfe_stop_streaming : Stop the DMA engine
 * @vq: ptr to vb2_queue
 *
 * This callback stops the DMA engine and any remaining buffers
 * in the DMA queue are released.
 */
static void vpfe_stop_streaming(struct vb2_queue *vq)
{
        struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
        struct vpfe_subdev_info *sdinfo;
        unsigned long flags;
        int ret;

        vpfe_pcr_enable(&vpfe->ccdc, 0);

        vpfe_detach_irq(vpfe);

        sdinfo = vpfe->current_subdev;
        ret = v4l2_subdev_call(sdinfo->sd, video, s_stream, 0);
        if (ret && ret != -ENOIOCTLCMD && ret != -ENODEV)
                vpfe_dbg(1, vpfe, "stream off failed in subdev\n");

        /* release all active buffers */
        spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
        if (vpfe->cur_frm == vpfe->next_frm) {
                vb2_buffer_done(&vpfe->cur_frm->vb, VB2_BUF_STATE_ERROR);
        } else {
                if (vpfe->cur_frm != NULL)
                        vb2_buffer_done(&vpfe->cur_frm->vb,
                                        VB2_BUF_STATE_ERROR);
                if (vpfe->next_frm != NULL)
                        vb2_buffer_done(&vpfe->next_frm->vb,
                                        VB2_BUF_STATE_ERROR);
        }

        while (!list_empty(&vpfe->dma_queue)) {
                vpfe->next_frm = list_entry(vpfe->dma_queue.next,
                                                struct vpfe_cap_buffer, list);
                list_del(&vpfe->next_frm->list);
                vb2_buffer_done(&vpfe->next_frm->vb, VB2_BUF_STATE_ERROR);
        }
        spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
}

static int vpfe_cropcap(struct file *file, void *priv,
                        struct v4l2_cropcap *crop)
{
        struct vpfe_device *vpfe = video_drvdata(file);

        vpfe_dbg(2, vpfe, "vpfe_cropcap\n");

        if (vpfe->std_index >= ARRAY_SIZE(vpfe_standards))
                return -EINVAL;

        memset(crop, 0, sizeof(struct v4l2_cropcap));

        crop->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        crop->defrect.width = vpfe_standards[vpfe->std_index].width;
        crop->bounds.width = crop->defrect.width;
        crop->defrect.height = vpfe_standards[vpfe->std_index].height;
        crop->bounds.height = crop->defrect.height;
        crop->pixelaspect = vpfe_standards[vpfe->std_index].pixelaspect;

        return 0;
}

static int
vpfe_g_selection(struct file *file, void *fh, struct v4l2_selection *s)
{
        struct vpfe_device *vpfe = video_drvdata(file);

        switch (s->target) {
        case V4L2_SEL_TGT_CROP_BOUNDS:
        case V4L2_SEL_TGT_CROP_DEFAULT:
                s->r.left = s->r.top = 0;
                s->r.width = vpfe->crop.width;
                s->r.height = vpfe->crop.height;
                break;

        case V4L2_SEL_TGT_CROP:
                s->r = vpfe->crop;
                break;

        default:
                return -EINVAL;
        }

        return 0;
}

static int enclosed_rectangle(struct v4l2_rect *a, struct v4l2_rect *b)
{
        if (a->left < b->left || a->top < b->top)
                return 0;

        if (a->left + a->width > b->left + b->width)
                return 0;

        if (a->top + a->height > b->top + b->height)
                return 0;

        return 1;
}

static int
vpfe_s_selection(struct file *file, void *fh, struct v4l2_selection *s)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        struct v4l2_rect cr = vpfe->crop;
        struct v4l2_rect r = s->r;

        /* If streaming is started, return error */
        if (vb2_is_busy(&vpfe->buffer_queue)) {
                vpfe_err(vpfe, "%s device busy\n", __func__);
                return -EBUSY;
        }

        if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
                        s->target != V4L2_SEL_TGT_CROP)
                return -EINVAL;

        v4l_bound_align_image(&r.width, 0, cr.width, 0,
                              &r.height, 0, cr.height, 0, 0);

        r.left = clamp_t(unsigned int, r.left, 0, cr.width - r.width);
        r.top  = clamp_t(unsigned int, r.top, 0, cr.height - r.height);

        if (s->flags & V4L2_SEL_FLAG_LE && !enclosed_rectangle(&r, &s->r))
                return -ERANGE;

        if (s->flags & V4L2_SEL_FLAG_GE && !enclosed_rectangle(&s->r, &r))
                return -ERANGE;

        s->r = vpfe->crop = r;

        vpfe_ccdc_set_image_window(&vpfe->ccdc, &r, vpfe->bpp);
        vpfe->fmt.fmt.pix.width = r.width;
        vpfe->fmt.fmt.pix.height = r.height;
        vpfe->fmt.fmt.pix.bytesperline = vpfe_ccdc_get_line_length(&vpfe->ccdc);
        vpfe->fmt.fmt.pix.sizeimage = vpfe->fmt.fmt.pix.bytesperline *
                                                vpfe->fmt.fmt.pix.height;

        vpfe_dbg(1, vpfe, "cropped (%d,%d)/%dx%d of %dx%d\n",
                 r.left, r.top, r.width, r.height, cr.width, cr.height);

        return 0;
}

static long vpfe_ioctl_default(struct file *file, void *priv,
                               bool valid_prio, unsigned int cmd, void *param)
{
        struct vpfe_device *vpfe = video_drvdata(file);
        int ret;

        vpfe_dbg(2, vpfe, "vpfe_ioctl_default\n");

        if (!valid_prio) {
                vpfe_err(vpfe, "%s device busy\n", __func__);
                return -EBUSY;
        }

        /* If streaming is started, return error */
        if (vb2_is_busy(&vpfe->buffer_queue)) {
                vpfe_err(vpfe, "%s device busy\n", __func__);
                return -EBUSY;
        }

        switch (cmd) {
        case VIDIOC_AM437X_CCDC_CFG:
                ret = vpfe_ccdc_set_params(&vpfe->ccdc, (void __user *)param);
                if (ret) {
                        vpfe_dbg(2, vpfe,
                                "Error setting parameters in CCDC\n");
                        return ret;
                }
                ret = vpfe_get_ccdc_image_format(vpfe,
                                                 &vpfe->fmt);
                if (ret < 0) {
                        vpfe_dbg(2, vpfe,
                                "Invalid image format at CCDC\n");
                        return ret;
                }
                break;

        default:
                ret = -ENOTTY;
                break;
        }

        return ret;
}

static const struct vb2_ops vpfe_video_qops = {
        .wait_prepare           = vb2_ops_wait_prepare,
        .wait_finish            = vb2_ops_wait_finish,
        .queue_setup            = vpfe_queue_setup,
        .buf_prepare            = vpfe_buffer_prepare,
        .buf_queue              = vpfe_buffer_queue,
        .start_streaming        = vpfe_start_streaming,
        .stop_streaming         = vpfe_stop_streaming,
};

/* vpfe capture driver file operations */
static const struct v4l2_file_operations vpfe_fops = {
        .owner          = THIS_MODULE,
        .open           = vpfe_open,
        .release        = vpfe_release,
        .read           = vb2_fop_read,
        .poll           = vb2_fop_poll,
        .unlocked_ioctl = video_ioctl2,
        .mmap           = vb2_fop_mmap,
};

/* vpfe capture ioctl operations */
static const struct v4l2_ioctl_ops vpfe_ioctl_ops = {
        .vidioc_querycap                = vpfe_querycap,
        .vidioc_enum_fmt_vid_cap        = vpfe_enum_fmt,
        .vidioc_g_fmt_vid_cap           = vpfe_g_fmt,
        .vidioc_s_fmt_vid_cap           = vpfe_s_fmt,
        .vidioc_try_fmt_vid_cap         = vpfe_try_fmt,

        .vidioc_enum_framesizes         = vpfe_enum_size,

        .vidioc_enum_input              = vpfe_enum_input,
        .vidioc_g_input                 = vpfe_g_input,
        .vidioc_s_input                 = vpfe_s_input,

        .vidioc_querystd                = vpfe_querystd,
        .vidioc_s_std                   = vpfe_s_std,
        .vidioc_g_std                   = vpfe_g_std,

        .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_expbuf                  = vb2_ioctl_expbuf,
        .vidioc_streamon                = vb2_ioctl_streamon,
        .vidioc_streamoff               = vb2_ioctl_streamoff,

        .vidioc_log_status              = v4l2_ctrl_log_status,
        .vidioc_subscribe_event         = v4l2_ctrl_subscribe_event,
        .vidioc_unsubscribe_event       = v4l2_event_unsubscribe,

        .vidioc_cropcap                 = vpfe_cropcap,
        .vidioc_g_selection             = vpfe_g_selection,
        .vidioc_s_selection             = vpfe_s_selection,

        .vidioc_default                 = vpfe_ioctl_default,
};

static int
vpfe_async_bound(struct v4l2_async_notifier *notifier,
                 struct v4l2_subdev *subdev,
                 struct v4l2_async_subdev *asd)
{
        struct vpfe_device *vpfe = container_of(notifier->v4l2_dev,
                                               struct vpfe_device, v4l2_dev);
        struct v4l2_subdev_mbus_code_enum mbus_code;
        struct vpfe_subdev_info *sdinfo;
        bool found = false;
        int i, j;

        vpfe_dbg(1, vpfe, "vpfe_async_bound\n");

        for (i = 0; i < ARRAY_SIZE(vpfe->cfg->asd); i++) {
                if (vpfe->cfg->asd[i]->match.of.node == asd[i].match.of.node) {
                        sdinfo = &vpfe->cfg->sub_devs[i];
                        vpfe->sd[i] = subdev;
                        vpfe->sd[i]->grp_id = sdinfo->grp_id;
                        found = true;
                        break;
                }
        }

        if (!found) {
                vpfe_info(vpfe, "sub device (%s) not matched\n", subdev->name);
                return -EINVAL;
        }

        vpfe->video_dev.tvnorms |= sdinfo->inputs[0].std;

        /* setup the supported formats & indexes */
        for (j = 0, i = 0; ; ++j) {
                struct vpfe_fmt *fmt;
                int ret;

                memset(&mbus_code, 0, sizeof(mbus_code));
                mbus_code.index = j;
                mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
                ret = v4l2_subdev_call(subdev, pad, enum_mbus_code,
                               NULL, &mbus_code);
                if (ret)
                        break;

                fmt = find_format_by_code(mbus_code.code);
                if (!fmt)
                        continue;

                fmt->supported = true;
                fmt->index = i++;
        }

        return 0;
}

static int vpfe_probe_complete(struct vpfe_device *vpfe)
{
        struct video_device *vdev;
        struct vb2_queue *q;
        int err;

        spin_lock_init(&vpfe->dma_queue_lock);
        mutex_init(&vpfe->lock);

        vpfe->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        /* set first sub device as current one */
        vpfe->current_subdev = &vpfe->cfg->sub_devs[0];
        vpfe->v4l2_dev.ctrl_handler = vpfe->sd[0]->ctrl_handler;

        err = vpfe_set_input(vpfe, 0);
        if (err)
                goto probe_out;

        /* Initialize videobuf2 queue as per the buffer type */
        vpfe->alloc_ctx = vb2_dma_contig_init_ctx(vpfe->pdev);
        if (IS_ERR(vpfe->alloc_ctx)) {
                vpfe_err(vpfe, "Failed to get the context\n");
                err = PTR_ERR(vpfe->alloc_ctx);
                goto probe_out;
        }

        q = &vpfe->buffer_queue;
        q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        q->io_modes = VB2_MMAP | VB2_DMABUF | VB2_READ;
        q->drv_priv = vpfe;
        q->ops = &vpfe_video_qops;
        q->mem_ops = &vb2_dma_contig_memops;
        q->buf_struct_size = sizeof(struct vpfe_cap_buffer);
        q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
        q->lock = &vpfe->lock;
        q->min_buffers_needed = 1;

        err = vb2_queue_init(q);
        if (err) {
                vpfe_err(vpfe, "vb2_queue_init() failed\n");
                vb2_dma_contig_cleanup_ctx(vpfe->alloc_ctx);
                goto probe_out;
        }

        INIT_LIST_HEAD(&vpfe->dma_queue);

        vdev = &vpfe->video_dev;
        strlcpy(vdev->name, VPFE_MODULE_NAME, sizeof(vdev->name));
        vdev->release = video_device_release_empty;
        vdev->fops = &vpfe_fops;
        vdev->ioctl_ops = &vpfe_ioctl_ops;
        vdev->v4l2_dev = &vpfe->v4l2_dev;
        vdev->vfl_dir = VFL_DIR_RX;
        vdev->queue = q;
        vdev->lock = &vpfe->lock;
        video_set_drvdata(vdev, vpfe);
        err = video_register_device(&vpfe->video_dev, VFL_TYPE_GRABBER, -1);
        if (err) {
                vpfe_err(vpfe,
                        "Unable to register video device.\n");
                goto probe_out;
        }

        return 0;

probe_out:
        v4l2_device_unregister(&vpfe->v4l2_dev);
        return err;
}

static int vpfe_async_complete(struct v4l2_async_notifier *notifier)
{
        struct vpfe_device *vpfe = container_of(notifier->v4l2_dev,
                                        struct vpfe_device, v4l2_dev);

        return vpfe_probe_complete(vpfe);
}

static struct vpfe_config *
vpfe_get_pdata(struct platform_device *pdev)
{
        struct device_node *endpoint = NULL;
        struct v4l2_of_endpoint bus_cfg;
        struct vpfe_subdev_info *sdinfo;
        struct vpfe_config *pdata;
        unsigned int flags;
        unsigned int i;
        int err;

        dev_dbg(&pdev->dev, "vpfe_get_pdata\n");

        if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
                return pdev->dev.platform_data;

        pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
        if (!pdata)
                return NULL;

        for (i = 0; ; i++) {
                struct device_node *rem;

                endpoint = of_graph_get_next_endpoint(pdev->dev.of_node,
                                                      endpoint);
                if (!endpoint)
                        break;

                sdinfo = &pdata->sub_devs[i];
                sdinfo->grp_id = 0;

                /* we only support camera */
                sdinfo->inputs[0].index = i;
                strcpy(sdinfo->inputs[0].name, "Camera");
                sdinfo->inputs[0].type = V4L2_INPUT_TYPE_CAMERA;
                sdinfo->inputs[0].std = V4L2_STD_ALL;
                sdinfo->inputs[0].capabilities = V4L2_IN_CAP_STD;

                sdinfo->can_route = 0;
                sdinfo->routes = NULL;

                of_property_read_u32(endpoint, "ti,am437x-vpfe-interface",
                                     &sdinfo->vpfe_param.if_type);
                if (sdinfo->vpfe_param.if_type < 0 ||
                        sdinfo->vpfe_param.if_type > 4) {
                        sdinfo->vpfe_param.if_type = VPFE_RAW_BAYER;
                }

                err = v4l2_of_parse_endpoint(endpoint, &bus_cfg);
                if (err) {
                        dev_err(&pdev->dev, "Could not parse the endpoint\n");
                        goto done;
                }

                sdinfo->vpfe_param.bus_width = bus_cfg.bus.parallel.bus_width;

                if (sdinfo->vpfe_param.bus_width < 8 ||
                        sdinfo->vpfe_param.bus_width > 16) {
                        dev_err(&pdev->dev, "Invalid bus width.\n");
                        goto done;
                }

                flags = bus_cfg.bus.parallel.flags;

                if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
                        sdinfo->vpfe_param.hdpol = 1;

                if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
                        sdinfo->vpfe_param.vdpol = 1;

                rem = of_graph_get_remote_port_parent(endpoint);
                if (!rem) {
                        dev_err(&pdev->dev, "Remote device at %s not found\n",
                                endpoint->full_name);
                        goto done;
                }

                pdata->asd[i] = devm_kzalloc(&pdev->dev,
                                             sizeof(struct v4l2_async_subdev),
                                             GFP_KERNEL);
                if (!pdata->asd[i]) {
                        of_node_put(rem);
                        pdata = NULL;
                        goto done;
                }

                pdata->asd[i]->match_type = V4L2_ASYNC_MATCH_OF;
                pdata->asd[i]->match.of.node = rem;
                of_node_put(rem);
        }

        of_node_put(endpoint);
        return pdata;

done:
        of_node_put(endpoint);
        return NULL;
}

/*
 * vpfe_probe : This function creates device entries by register
 * itself to the V4L2 driver and initializes fields of each
 * device objects
 */
static int vpfe_probe(struct platform_device *pdev)
{
        struct vpfe_config *vpfe_cfg = vpfe_get_pdata(pdev);
        struct vpfe_device *vpfe;
        struct vpfe_ccdc *ccdc;
        struct resource *res;
        int ret;

        if (!vpfe_cfg) {
                dev_err(&pdev->dev, "No platform data\n");
                return -EINVAL;
        }

        vpfe = devm_kzalloc(&pdev->dev, sizeof(*vpfe), GFP_KERNEL);
        if (!vpfe)
                return -ENOMEM;

        vpfe->pdev = &pdev->dev;
        vpfe->cfg = vpfe_cfg;
        ccdc = &vpfe->ccdc;

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        ccdc->ccdc_cfg.base_addr = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(ccdc->ccdc_cfg.base_addr))
                return PTR_ERR(ccdc->ccdc_cfg.base_addr);

        vpfe->irq = platform_get_irq(pdev, 0);
        if (vpfe->irq <= 0) {
                dev_err(&pdev->dev, "No IRQ resource\n");
                return -ENODEV;
        }

        ret = devm_request_irq(vpfe->pdev, vpfe->irq, vpfe_isr, 0,
                               "vpfe_capture0", vpfe);
        if (ret) {
                dev_err(&pdev->dev, "Unable to request interrupt\n");
                return -EINVAL;
        }

        ret = v4l2_device_register(&pdev->dev, &vpfe->v4l2_dev);
        if (ret) {
                vpfe_err(vpfe,
                        "Unable to register v4l2 device.\n");
                return ret;
        }

        /* set the driver data in platform device */
        platform_set_drvdata(pdev, vpfe);
        /* Enabling module functional clock */
        pm_runtime_enable(&pdev->dev);

        /* for now just enable it here instead of waiting for the open */
        pm_runtime_get_sync(&pdev->dev);

        vpfe_ccdc_config_defaults(ccdc);

        pm_runtime_put_sync(&pdev->dev);

        vpfe->sd = devm_kzalloc(&pdev->dev, sizeof(struct v4l2_subdev *) *
                                ARRAY_SIZE(vpfe->cfg->asd), GFP_KERNEL);
        if (!vpfe->sd) {
                ret = -ENOMEM;
                goto probe_out_v4l2_unregister;
        }

        vpfe->notifier.subdevs = vpfe->cfg->asd;
        vpfe->notifier.num_subdevs = ARRAY_SIZE(vpfe->cfg->asd);
        vpfe->notifier.bound = vpfe_async_bound;
        vpfe->notifier.complete = vpfe_async_complete;
        ret = v4l2_async_notifier_register(&vpfe->v4l2_dev,
                                                &vpfe->notifier);
        if (ret) {
                vpfe_err(vpfe, "Error registering async notifier\n");
                ret = -EINVAL;
                goto probe_out_v4l2_unregister;
        }

        return 0;

probe_out_v4l2_unregister:
        v4l2_device_unregister(&vpfe->v4l2_dev);
        return ret;
}

/*
 * vpfe_remove : It un-register device from V4L2 driver
 */
static int vpfe_remove(struct platform_device *pdev)
{
        struct vpfe_device *vpfe = platform_get_drvdata(pdev);

        vpfe_dbg(2, vpfe, "vpfe_remove\n");

        pm_runtime_disable(&pdev->dev);

        v4l2_async_notifier_unregister(&vpfe->notifier);
        v4l2_device_unregister(&vpfe->v4l2_dev);
        video_unregister_device(&vpfe->video_dev);

        return 0;
}

#ifdef CONFIG_PM_SLEEP

static void vpfe_save_context(struct vpfe_ccdc *ccdc)
{
        ccdc->ccdc_ctx[VPFE_PCR >> 2] = vpfe_reg_read(ccdc, VPFE_PCR);
        ccdc->ccdc_ctx[VPFE_SYNMODE >> 2] = vpfe_reg_read(ccdc, VPFE_SYNMODE);
        ccdc->ccdc_ctx[VPFE_SDOFST >> 2] = vpfe_reg_read(ccdc, VPFE_SDOFST);
        ccdc->ccdc_ctx[VPFE_SDR_ADDR >> 2] = vpfe_reg_read(ccdc, VPFE_SDR_ADDR);
        ccdc->ccdc_ctx[VPFE_CLAMP >> 2] = vpfe_reg_read(ccdc, VPFE_CLAMP);
        ccdc->ccdc_ctx[VPFE_DCSUB >> 2] = vpfe_reg_read(ccdc, VPFE_DCSUB);
        ccdc->ccdc_ctx[VPFE_COLPTN >> 2] = vpfe_reg_read(ccdc, VPFE_COLPTN);
        ccdc->ccdc_ctx[VPFE_BLKCMP >> 2] = vpfe_reg_read(ccdc, VPFE_BLKCMP);
        ccdc->ccdc_ctx[VPFE_VDINT >> 2] = vpfe_reg_read(ccdc, VPFE_VDINT);
        ccdc->ccdc_ctx[VPFE_ALAW >> 2] = vpfe_reg_read(ccdc, VPFE_ALAW);
        ccdc->ccdc_ctx[VPFE_REC656IF >> 2] = vpfe_reg_read(ccdc, VPFE_REC656IF);
        ccdc->ccdc_ctx[VPFE_CCDCFG >> 2] = vpfe_reg_read(ccdc, VPFE_CCDCFG);
        ccdc->ccdc_ctx[VPFE_CULLING >> 2] = vpfe_reg_read(ccdc, VPFE_CULLING);
        ccdc->ccdc_ctx[VPFE_HD_VD_WID >> 2] = vpfe_reg_read(ccdc,
                                                            VPFE_HD_VD_WID);
        ccdc->ccdc_ctx[VPFE_PIX_LINES >> 2] = vpfe_reg_read(ccdc,
                                                            VPFE_PIX_LINES);
        ccdc->ccdc_ctx[VPFE_HORZ_INFO >> 2] = vpfe_reg_read(ccdc,
                                                            VPFE_HORZ_INFO);
        ccdc->ccdc_ctx[VPFE_VERT_START >> 2] = vpfe_reg_read(ccdc,
                                                             VPFE_VERT_START);
        ccdc->ccdc_ctx[VPFE_VERT_LINES >> 2] = vpfe_reg_read(ccdc,
                                                             VPFE_VERT_LINES);
        ccdc->ccdc_ctx[VPFE_HSIZE_OFF >> 2] = vpfe_reg_read(ccdc,
                                                            VPFE_HSIZE_OFF);
}

static int vpfe_suspend(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct vpfe_device *vpfe = platform_get_drvdata(pdev);
        struct vpfe_ccdc *ccdc = &vpfe->ccdc;

        /* if streaming has not started we don't care */
        if (!vb2_start_streaming_called(&vpfe->buffer_queue))
                return 0;

        pm_runtime_get_sync(dev);
        vpfe_config_enable(ccdc, 1);

        /* Save VPFE context */
        vpfe_save_context(ccdc);

        /* Disable CCDC */
        vpfe_pcr_enable(ccdc, 0);
        vpfe_config_enable(ccdc, 0);

        /* Disable both master and slave clock */
        pm_runtime_put_sync(dev);

        /* Select sleep pin state */
        pinctrl_pm_select_sleep_state(dev);

        return 0;
}

static void vpfe_restore_context(struct vpfe_ccdc *ccdc)
{
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_SYNMODE >> 2], VPFE_SYNMODE);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_CULLING >> 2], VPFE_CULLING);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_SDOFST >> 2], VPFE_SDOFST);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_SDR_ADDR >> 2], VPFE_SDR_ADDR);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_CLAMP >> 2], VPFE_CLAMP);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_DCSUB >> 2], VPFE_DCSUB);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_COLPTN >> 2], VPFE_COLPTN);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_BLKCMP >> 2], VPFE_BLKCMP);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_VDINT >> 2], VPFE_VDINT);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_ALAW >> 2], VPFE_ALAW);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_REC656IF >> 2], VPFE_REC656IF);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_CCDCFG >> 2], VPFE_CCDCFG);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_PCR >> 2], VPFE_PCR);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_HD_VD_WID >> 2],
                                                VPFE_HD_VD_WID);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_PIX_LINES >> 2],
                                                VPFE_PIX_LINES);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_HORZ_INFO >> 2],
                                                VPFE_HORZ_INFO);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_VERT_START >> 2],
                                                VPFE_VERT_START);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_VERT_LINES >> 2],
                                                VPFE_VERT_LINES);
        vpfe_reg_write(ccdc, ccdc->ccdc_ctx[VPFE_HSIZE_OFF >> 2],
                                                VPFE_HSIZE_OFF);
}

static int vpfe_resume(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct vpfe_device *vpfe = platform_get_drvdata(pdev);
        struct vpfe_ccdc *ccdc = &vpfe->ccdc;

        /* if streaming has not started we don't care */
        if (!vb2_start_streaming_called(&vpfe->buffer_queue))
                return 0;

        /* Enable both master and slave clock */
        pm_runtime_get_sync(dev);
        vpfe_config_enable(ccdc, 1);

        /* Restore VPFE context */
        vpfe_restore_context(ccdc);

        vpfe_config_enable(ccdc, 0);
        pm_runtime_put_sync(dev);

        /* Select default pin state */
        pinctrl_pm_select_default_state(dev);

        return 0;
}

#endif

static SIMPLE_DEV_PM_OPS(vpfe_pm_ops, vpfe_suspend, vpfe_resume);

static const struct of_device_id vpfe_of_match[] = {
        { .compatible = "ti,am437x-vpfe", },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, vpfe_of_match);

static struct platform_driver vpfe_driver = {
        .probe          = vpfe_probe,
        .remove         = vpfe_remove,
        .driver = {
                .name   = VPFE_MODULE_NAME,
                .pm     = &vpfe_pm_ops,
                .of_match_table = of_match_ptr(vpfe_of_match),
        },
};

module_platform_driver(vpfe_driver);

MODULE_AUTHOR("Texas Instruments");
MODULE_DESCRIPTION("TI AM437x VPFE driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(VPFE_VERSION);