// SPDX-License-Identifier: GPL-2.0+
/*
 * Driver for Analog Devices ADV748X HDMI receiver and Component Processor (CP)
 *
 * Copyright (C) 2017 Renesas Electronics Corp.
 */

#include <linux/module.h>
#include <linux/mutex.h>

#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dv-timings.h>
#include <media/v4l2-ioctl.h>

#include <uapi/linux/v4l2-dv-timings.h>

#include "adv748x.h"

/* -----------------------------------------------------------------------------
 * HDMI and CP
 */

#define ADV748X_HDMI_MIN_WIDTH          640
#define ADV748X_HDMI_MAX_WIDTH          1920
#define ADV748X_HDMI_MIN_HEIGHT         480
#define ADV748X_HDMI_MAX_HEIGHT         1200

/* V4L2_DV_BT_CEA_720X480I59_94 - 0.5 MHz */
#define ADV748X_HDMI_MIN_PIXELCLOCK     13000000
/* V4L2_DV_BT_DMT_1600X1200P60 */
#define ADV748X_HDMI_MAX_PIXELCLOCK     162000000

static const struct v4l2_dv_timings_cap adv748x_hdmi_timings_cap = {
        .type = V4L2_DV_BT_656_1120,
        /* keep this initialization for compatibility with GCC < 4.4.6 */
        .reserved = { 0 },

        V4L2_INIT_BT_TIMINGS(ADV748X_HDMI_MIN_WIDTH, ADV748X_HDMI_MAX_WIDTH,
                             ADV748X_HDMI_MIN_HEIGHT, ADV748X_HDMI_MAX_HEIGHT,
                             ADV748X_HDMI_MIN_PIXELCLOCK,
                             ADV748X_HDMI_MAX_PIXELCLOCK,
                             V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT,
                             V4L2_DV_BT_CAP_PROGRESSIVE)
};

struct adv748x_hdmi_video_standards {
        struct v4l2_dv_timings timings;
        u8 vid_std;
        u8 v_freq;
};

static const struct adv748x_hdmi_video_standards
adv748x_hdmi_video_standards[] = {
        { V4L2_DV_BT_CEA_720X480P59_94, 0x4a, 0x00 },
        { V4L2_DV_BT_CEA_720X576P50, 0x4b, 0x00 },
        { V4L2_DV_BT_CEA_1280X720P60, 0x53, 0x00 },
        { V4L2_DV_BT_CEA_1280X720P50, 0x53, 0x01 },
        { V4L2_DV_BT_CEA_1280X720P30, 0x53, 0x02 },
        { V4L2_DV_BT_CEA_1280X720P25, 0x53, 0x03 },
        { V4L2_DV_BT_CEA_1280X720P24, 0x53, 0x04 },
        { V4L2_DV_BT_CEA_1920X1080P60, 0x5e, 0x00 },
        { V4L2_DV_BT_CEA_1920X1080P50, 0x5e, 0x01 },
        { V4L2_DV_BT_CEA_1920X1080P30, 0x5e, 0x02 },
        { V4L2_DV_BT_CEA_1920X1080P25, 0x5e, 0x03 },
        { V4L2_DV_BT_CEA_1920X1080P24, 0x5e, 0x04 },
        /* SVGA */
        { V4L2_DV_BT_DMT_800X600P56, 0x80, 0x00 },
        { V4L2_DV_BT_DMT_800X600P60, 0x81, 0x00 },
        { V4L2_DV_BT_DMT_800X600P72, 0x82, 0x00 },
        { V4L2_DV_BT_DMT_800X600P75, 0x83, 0x00 },
        { V4L2_DV_BT_DMT_800X600P85, 0x84, 0x00 },
        /* SXGA */
        { V4L2_DV_BT_DMT_1280X1024P60, 0x85, 0x00 },
        { V4L2_DV_BT_DMT_1280X1024P75, 0x86, 0x00 },
        /* VGA */
        { V4L2_DV_BT_DMT_640X480P60, 0x88, 0x00 },
        { V4L2_DV_BT_DMT_640X480P72, 0x89, 0x00 },
        { V4L2_DV_BT_DMT_640X480P75, 0x8a, 0x00 },
        { V4L2_DV_BT_DMT_640X480P85, 0x8b, 0x00 },
        /* XGA */
        { V4L2_DV_BT_DMT_1024X768P60, 0x8c, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P70, 0x8d, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P75, 0x8e, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P85, 0x8f, 0x00 },
        /* UXGA */
        { V4L2_DV_BT_DMT_1600X1200P60, 0x96, 0x00 },
};

static void adv748x_hdmi_fill_format(struct adv748x_hdmi *hdmi,
                                     struct v4l2_mbus_framefmt *fmt)
{
        memset(fmt, 0, sizeof(*fmt));

        fmt->code = MEDIA_BUS_FMT_RGB888_1X24;
        fmt->field = hdmi->timings.bt.interlaced ?
                        V4L2_FIELD_ALTERNATE : V4L2_FIELD_NONE;

        /* TODO: The colorspace depends on the AVI InfoFrame contents */
        fmt->colorspace = V4L2_COLORSPACE_SRGB;

        fmt->width = hdmi->timings.bt.width;
        fmt->height = hdmi->timings.bt.height;

        if (fmt->field == V4L2_FIELD_ALTERNATE)
                fmt->height /= 2;
}

static void adv748x_fill_optional_dv_timings(struct v4l2_dv_timings *timings)
{
        v4l2_find_dv_timings_cap(timings, &adv748x_hdmi_timings_cap,
                                 250000, NULL, NULL);
}

static bool adv748x_hdmi_has_signal(struct adv748x_state *state)
{
        int val;

        /* Check that VERT_FILTER and DE_REGEN is locked */
        val = hdmi_read(state, ADV748X_HDMI_LW1);
        return (val & ADV748X_HDMI_LW1_VERT_FILTER) &&
               (val & ADV748X_HDMI_LW1_DE_REGEN);
}

static int adv748x_hdmi_read_pixelclock(struct adv748x_state *state)
{
        int a, b;

        a = hdmi_read(state, ADV748X_HDMI_TMDS_1);
        b = hdmi_read(state, ADV748X_HDMI_TMDS_2);
        if (a < 0 || b < 0)
                return -ENODATA;

        /*
         * The high 9 bits store TMDS frequency measurement in MHz
         * The low 7 bits of TMDS_2 store the 7-bit TMDS fractional frequency
         * measurement in 1/128 MHz
         */
        return ((a << 1) | (b >> 7)) * 1000000 + (b & 0x7f) * 1000000 / 128;
}

/*
 * adv748x_hdmi_set_de_timings: Adjust horizontal picture offset through DE
 *
 * HDMI CP uses a Data Enable synchronisation timing reference
 *
 * Vary the leading and trailing edge position of the DE signal output by the CP
 * core. Values are stored as signed-twos-complement in one-pixel-clock units
 *
 * The start and end are shifted equally by the 10-bit shift value.
 */
static void adv748x_hdmi_set_de_timings(struct adv748x_state *state, int shift)
{
        u8 high, low;

        /* POS_HIGH stores bits 8 and 9 of both the start and end */
        high = ADV748X_CP_DE_POS_HIGH_SET;
        high |= (shift & 0x300) >> 8;
        low = shift & 0xff;

        /* The sequence of the writes is important and must be followed */
        cp_write(state, ADV748X_CP_DE_POS_HIGH, high);
        cp_write(state, ADV748X_CP_DE_POS_END_LOW, low);

        high |= (shift & 0x300) >> 6;

        cp_write(state, ADV748X_CP_DE_POS_HIGH, high);
        cp_write(state, ADV748X_CP_DE_POS_START_LOW, low);
}

static int adv748x_hdmi_set_video_timings(struct adv748x_state *state,
                                          const struct v4l2_dv_timings *timings)
{
        const struct adv748x_hdmi_video_standards *stds =
                adv748x_hdmi_video_standards;
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(adv748x_hdmi_video_standards); i++) {
                if (!v4l2_match_dv_timings(timings, &stds[i].timings, 250000,
                                           false))
                        continue;
        }

        if (i >= ARRAY_SIZE(adv748x_hdmi_video_standards))
                return -EINVAL;

        /*
         * When setting cp_vid_std to either 720p, 1080i, or 1080p, the video
         * will get shifted horizontally to the left in active video mode.
         * The de_h_start and de_h_end controls are used to centre the picture
         * correctly
         */
        switch (stds[i].vid_std) {
        case 0x53: /* 720p */
                adv748x_hdmi_set_de_timings(state, -40);
                break;
        case 0x54: /* 1080i */
        case 0x5e: /* 1080p */
                adv748x_hdmi_set_de_timings(state, -44);
                break;
        default:
                adv748x_hdmi_set_de_timings(state, 0);
                break;
        }

        io_write(state, ADV748X_IO_VID_STD, stds[i].vid_std);
        io_clrset(state, ADV748X_IO_DATAPATH, ADV748X_IO_DATAPATH_VFREQ_M,
                  stds[i].v_freq << ADV748X_IO_DATAPATH_VFREQ_SHIFT);

        return 0;
}

/* -----------------------------------------------------------------------------
 * v4l2_subdev_video_ops
 */

static int adv748x_hdmi_s_dv_timings(struct v4l2_subdev *sd,
                                     struct v4l2_dv_timings *timings)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        int ret;

        if (!timings)
                return -EINVAL;

        if (v4l2_match_dv_timings(&hdmi->timings, timings, 0, false))
                return 0;

        if (!v4l2_valid_dv_timings(timings, &adv748x_hdmi_timings_cap,
                                   NULL, NULL))
                return -ERANGE;

        adv748x_fill_optional_dv_timings(timings);

        mutex_lock(&state->mutex);

        ret = adv748x_hdmi_set_video_timings(state, timings);
        if (ret)
                goto error;

        hdmi->timings = *timings;

        cp_clrset(state, ADV748X_CP_VID_ADJ_2, ADV748X_CP_VID_ADJ_2_INTERLACED,
                  timings->bt.interlaced ?
                                  ADV748X_CP_VID_ADJ_2_INTERLACED : 0);

        mutex_unlock(&state->mutex);

        return 0;

error:
        mutex_unlock(&state->mutex);
        return ret;
}

static int adv748x_hdmi_g_dv_timings(struct v4l2_subdev *sd,
                                     struct v4l2_dv_timings *timings)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);

        mutex_lock(&state->mutex);

        *timings = hdmi->timings;

        mutex_unlock(&state->mutex);

        return 0;
}

static int adv748x_hdmi_query_dv_timings(struct v4l2_subdev *sd,
                                         struct v4l2_dv_timings *timings)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        struct v4l2_bt_timings *bt = &timings->bt;
        int pixelclock;
        int polarity;

        if (!timings)
                return -EINVAL;

        memset(timings, 0, sizeof(struct v4l2_dv_timings));

        if (!adv748x_hdmi_has_signal(state))
                return -ENOLINK;

        pixelclock = adv748x_hdmi_read_pixelclock(state);
        if (pixelclock < 0)
                return -ENODATA;

        timings->type = V4L2_DV_BT_656_1120;

        bt->pixelclock = pixelclock;
        bt->interlaced = hdmi_read(state, ADV748X_HDMI_F1H1) &
                                ADV748X_HDMI_F1H1_INTERLACED ?
                                V4L2_DV_INTERLACED : V4L2_DV_PROGRESSIVE;
        bt->width = hdmi_read16(state, ADV748X_HDMI_LW1,
                                ADV748X_HDMI_LW1_WIDTH_MASK);
        bt->height = hdmi_read16(state, ADV748X_HDMI_F0H1,
                                 ADV748X_HDMI_F0H1_HEIGHT_MASK);
        bt->hfrontporch = hdmi_read16(state, ADV748X_HDMI_HFRONT_PORCH,
                                      ADV748X_HDMI_HFRONT_PORCH_MASK);
        bt->hsync = hdmi_read16(state, ADV748X_HDMI_HSYNC_WIDTH,
                                ADV748X_HDMI_HSYNC_WIDTH_MASK);
        bt->hbackporch = hdmi_read16(state, ADV748X_HDMI_HBACK_PORCH,
                                     ADV748X_HDMI_HBACK_PORCH_MASK);
        bt->vfrontporch = hdmi_read16(state, ADV748X_HDMI_VFRONT_PORCH,
                                      ADV748X_HDMI_VFRONT_PORCH_MASK) / 2;
        bt->vsync = hdmi_read16(state, ADV748X_HDMI_VSYNC_WIDTH,
                                ADV748X_HDMI_VSYNC_WIDTH_MASK) / 2;
        bt->vbackporch = hdmi_read16(state, ADV748X_HDMI_VBACK_PORCH,
                                     ADV748X_HDMI_VBACK_PORCH_MASK) / 2;

        polarity = hdmi_read(state, 0x05);
        bt->polarities = (polarity & BIT(4) ? V4L2_DV_VSYNC_POS_POL : 0) |
                (polarity & BIT(5) ? V4L2_DV_HSYNC_POS_POL : 0);

        if (bt->interlaced == V4L2_DV_INTERLACED) {
                bt->height += hdmi_read16(state, 0x0b, 0x1fff);
                bt->il_vfrontporch = hdmi_read16(state, 0x2c, 0x3fff) / 2;
                bt->il_vsync = hdmi_read16(state, 0x30, 0x3fff) / 2;
                bt->il_vbackporch = hdmi_read16(state, 0x34, 0x3fff) / 2;
        }

        adv748x_fill_optional_dv_timings(timings);

        /*
         * No interrupt handling is implemented yet.
         * There should be an IRQ when a cable is plugged and the new timings
         * should be figured out and stored to state.
         */
        hdmi->timings = *timings;

        return 0;
}

static int adv748x_hdmi_g_input_status(struct v4l2_subdev *sd, u32 *status)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);

        mutex_lock(&state->mutex);

        *status = adv748x_hdmi_has_signal(state) ? 0 : V4L2_IN_ST_NO_SIGNAL;

        mutex_unlock(&state->mutex);

        return 0;
}

static int adv748x_hdmi_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        int ret;

        mutex_lock(&state->mutex);

        ret = adv748x_tx_power(hdmi->tx, enable);
        if (ret)
                goto done;

        if (adv748x_hdmi_has_signal(state))
                adv_dbg(state, "Detected HDMI signal\n");
        else
                adv_dbg(state, "Couldn't detect HDMI video signal\n");

done:
        mutex_unlock(&state->mutex);
        return ret;
}

static int adv748x_hdmi_g_pixelaspect(struct v4l2_subdev *sd,
                                      struct v4l2_fract *aspect)
{
        aspect->numerator = 1;
        aspect->denominator = 1;

        return 0;
}

static const struct v4l2_subdev_video_ops adv748x_video_ops_hdmi = {
        .s_dv_timings = adv748x_hdmi_s_dv_timings,
        .g_dv_timings = adv748x_hdmi_g_dv_timings,
        .query_dv_timings = adv748x_hdmi_query_dv_timings,
        .g_input_status = adv748x_hdmi_g_input_status,
        .s_stream = adv748x_hdmi_s_stream,
        .g_pixelaspect = adv748x_hdmi_g_pixelaspect,
};

/* -----------------------------------------------------------------------------
 * v4l2_subdev_pad_ops
 */

static int adv748x_hdmi_propagate_pixelrate(struct adv748x_hdmi *hdmi)
{
        struct v4l2_subdev *tx;
        struct v4l2_dv_timings timings;

        tx = adv748x_get_remote_sd(&hdmi->pads[ADV748X_HDMI_SOURCE]);
        if (!tx)
                return -ENOLINK;

        adv748x_hdmi_query_dv_timings(&hdmi->sd, &timings);

        return adv748x_csi2_set_pixelrate(tx, timings.bt.pixelclock);
}

static int adv748x_hdmi_enum_mbus_code(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_pad_config *cfg,
                                  struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->index != 0)
                return -EINVAL;

        code->code = MEDIA_BUS_FMT_RGB888_1X24;

        return 0;
}

static int adv748x_hdmi_get_format(struct v4l2_subdev *sd,
                                   struct v4l2_subdev_pad_config *cfg,
                                   struct v4l2_subdev_format *sdformat)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct v4l2_mbus_framefmt *mbusformat;

        if (sdformat->pad != ADV748X_HDMI_SOURCE)
                return -EINVAL;

        if (sdformat->which == V4L2_SUBDEV_FORMAT_TRY) {
                mbusformat = v4l2_subdev_get_try_format(sd, cfg, sdformat->pad);
                sdformat->format = *mbusformat;
        } else {
                adv748x_hdmi_fill_format(hdmi, &sdformat->format);
                adv748x_hdmi_propagate_pixelrate(hdmi);
        }

        return 0;
}

static int adv748x_hdmi_set_format(struct v4l2_subdev *sd,
                                   struct v4l2_subdev_pad_config *cfg,
                                   struct v4l2_subdev_format *sdformat)
{
        struct v4l2_mbus_framefmt *mbusformat;

        if (sdformat->pad != ADV748X_HDMI_SOURCE)
                return -EINVAL;

        if (sdformat->which == V4L2_SUBDEV_FORMAT_ACTIVE)
                return adv748x_hdmi_get_format(sd, cfg, sdformat);

        mbusformat = v4l2_subdev_get_try_format(sd, cfg, sdformat->pad);
        *mbusformat = sdformat->format;

        return 0;
}

static int adv748x_hdmi_get_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);

        memset(edid->reserved, 0, sizeof(edid->reserved));

        if (!hdmi->edid.present)
                return -ENODATA;

        if (edid->start_block == 0 && edid->blocks == 0) {
                edid->blocks = hdmi->edid.blocks;
                return 0;
        }

        if (edid->start_block >= hdmi->edid.blocks)
                return -EINVAL;

        if (edid->start_block + edid->blocks > hdmi->edid.blocks)
                edid->blocks = hdmi->edid.blocks - edid->start_block;

        memcpy(edid->edid, hdmi->edid.edid + edid->start_block * 128,
                        edid->blocks * 128);

        return 0;
}

static inline int adv748x_hdmi_edid_write_block(struct adv748x_hdmi *hdmi,
                                        unsigned int total_len, const u8 *val)
{
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        int err = 0;
        int i = 0;
        int len = 0;

        adv_dbg(state, "%s: write EDID block (%d byte)\n",
                                __func__, total_len);

        while (!err && i < total_len) {
                len = (total_len - i) > I2C_SMBUS_BLOCK_MAX ?
                                I2C_SMBUS_BLOCK_MAX :
                                (total_len - i);

                err = adv748x_write_block(state, ADV748X_PAGE_EDID,
                                i, val + i, len);
                i += len;
        }

        return err;
}

static int adv748x_hdmi_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
{
        struct adv748x_hdmi *hdmi = adv748x_sd_to_hdmi(sd);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        int err;

        memset(edid->reserved, 0, sizeof(edid->reserved));

        if (edid->start_block != 0)
                return -EINVAL;

        if (edid->blocks == 0) {
                hdmi->edid.blocks = 0;
                hdmi->edid.present = 0;

                /* Fall back to a 16:9 aspect ratio */
                hdmi->aspect_ratio.numerator = 16;
                hdmi->aspect_ratio.denominator = 9;

                /* Disable the EDID */
                repeater_write(state, ADV748X_REPEATER_EDID_SZ,
                               edid->blocks << ADV748X_REPEATER_EDID_SZ_SHIFT);

                repeater_write(state, ADV748X_REPEATER_EDID_CTL, 0);

                return 0;
        }

        if (edid->blocks > 4) {
                edid->blocks = 4;
                return -E2BIG;
        }

        memcpy(hdmi->edid.edid, edid->edid, 128 * edid->blocks);
        hdmi->edid.blocks = edid->blocks;
        hdmi->edid.present = true;

        hdmi->aspect_ratio = v4l2_calc_aspect_ratio(edid->edid[0x15],
                        edid->edid[0x16]);

        err = adv748x_hdmi_edid_write_block(hdmi, 128 * edid->blocks,
                        hdmi->edid.edid);
        if (err < 0) {
                v4l2_err(sd, "error %d writing edid pad %d\n", err, edid->pad);
                return err;
        }

        repeater_write(state, ADV748X_REPEATER_EDID_SZ,
                       edid->blocks << ADV748X_REPEATER_EDID_SZ_SHIFT);

        repeater_write(state, ADV748X_REPEATER_EDID_CTL,
                       ADV748X_REPEATER_EDID_CTL_EN);

        return 0;
}

static bool adv748x_hdmi_check_dv_timings(const struct v4l2_dv_timings *timings,
                                          void *hdl)
{
        const struct adv748x_hdmi_video_standards *stds =
                adv748x_hdmi_video_standards;
        unsigned int i;

        for (i = 0; stds[i].timings.bt.width; i++)
                if (v4l2_match_dv_timings(timings, &stds[i].timings, 0, false))
                        return true;

        return false;
}

static int adv748x_hdmi_enum_dv_timings(struct v4l2_subdev *sd,
                                        struct v4l2_enum_dv_timings *timings)
{
        return v4l2_enum_dv_timings_cap(timings, &adv748x_hdmi_timings_cap,
                                        adv748x_hdmi_check_dv_timings, NULL);
}

static int adv748x_hdmi_dv_timings_cap(struct v4l2_subdev *sd,
                                       struct v4l2_dv_timings_cap *cap)
{
        *cap = adv748x_hdmi_timings_cap;
        return 0;
}

static const struct v4l2_subdev_pad_ops adv748x_pad_ops_hdmi = {
        .enum_mbus_code = adv748x_hdmi_enum_mbus_code,
        .set_fmt = adv748x_hdmi_set_format,
        .get_fmt = adv748x_hdmi_get_format,
        .get_edid = adv748x_hdmi_get_edid,
        .set_edid = adv748x_hdmi_set_edid,
        .dv_timings_cap = adv748x_hdmi_dv_timings_cap,
        .enum_dv_timings = adv748x_hdmi_enum_dv_timings,
};

/* -----------------------------------------------------------------------------
 * v4l2_subdev_ops
 */

static const struct v4l2_subdev_ops adv748x_ops_hdmi = {
        .video = &adv748x_video_ops_hdmi,
        .pad = &adv748x_pad_ops_hdmi,
};

/* -----------------------------------------------------------------------------
 * Controls
 */

static const char * const hdmi_ctrl_patgen_menu[] = {
        "Disabled",
        "Solid Color",
        "Color Bars",
        "Ramp Grey",
        "Ramp Blue",
        "Ramp Red",
        "Checkered"
};

static int adv748x_hdmi_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct adv748x_hdmi *hdmi = adv748x_ctrl_to_hdmi(ctrl);
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        int ret;
        u8 pattern;

        /* Enable video adjustment first */
        ret = cp_clrset(state, ADV748X_CP_VID_ADJ,
                        ADV748X_CP_VID_ADJ_ENABLE,
                        ADV748X_CP_VID_ADJ_ENABLE);
        if (ret < 0)
                return ret;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                ret = cp_write(state, ADV748X_CP_BRI, ctrl->val);
                break;
        case V4L2_CID_HUE:
                ret = cp_write(state, ADV748X_CP_HUE, ctrl->val);
                break;
        case V4L2_CID_CONTRAST:
                ret = cp_write(state, ADV748X_CP_CON, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                ret = cp_write(state, ADV748X_CP_SAT, ctrl->val);
                break;
        case V4L2_CID_TEST_PATTERN:
                pattern = ctrl->val;

                /* Pattern is 0-indexed. Ctrl Menu is 1-indexed */
                if (pattern) {
                        pattern--;
                        pattern |= ADV748X_CP_PAT_GEN_EN;
                }

                ret = cp_write(state, ADV748X_CP_PAT_GEN, pattern);

                break;
        default:
                return -EINVAL;
        }

        return ret;
}

static const struct v4l2_ctrl_ops adv748x_hdmi_ctrl_ops = {
        .s_ctrl = adv748x_hdmi_s_ctrl,
};

static int adv748x_hdmi_init_controls(struct adv748x_hdmi *hdmi)
{
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);

        v4l2_ctrl_handler_init(&hdmi->ctrl_hdl, 5);

        /* Use our mutex for the controls */
        hdmi->ctrl_hdl.lock = &state->mutex;

        v4l2_ctrl_new_std(&hdmi->ctrl_hdl, &adv748x_hdmi_ctrl_ops,
                          V4L2_CID_BRIGHTNESS, ADV748X_CP_BRI_MIN,
                          ADV748X_CP_BRI_MAX, 1, ADV748X_CP_BRI_DEF);
        v4l2_ctrl_new_std(&hdmi->ctrl_hdl, &adv748x_hdmi_ctrl_ops,
                          V4L2_CID_CONTRAST, ADV748X_CP_CON_MIN,
                          ADV748X_CP_CON_MAX, 1, ADV748X_CP_CON_DEF);
        v4l2_ctrl_new_std(&hdmi->ctrl_hdl, &adv748x_hdmi_ctrl_ops,
                          V4L2_CID_SATURATION, ADV748X_CP_SAT_MIN,
                          ADV748X_CP_SAT_MAX, 1, ADV748X_CP_SAT_DEF);
        v4l2_ctrl_new_std(&hdmi->ctrl_hdl, &adv748x_hdmi_ctrl_ops,
                          V4L2_CID_HUE, ADV748X_CP_HUE_MIN,
                          ADV748X_CP_HUE_MAX, 1, ADV748X_CP_HUE_DEF);

        /*
         * Todo: V4L2_CID_DV_RX_POWER_PRESENT should also be supported when
         * interrupts are handled correctly
         */

        v4l2_ctrl_new_std_menu_items(&hdmi->ctrl_hdl, &adv748x_hdmi_ctrl_ops,
                                     V4L2_CID_TEST_PATTERN,
                                     ARRAY_SIZE(hdmi_ctrl_patgen_menu) - 1,
                                     0, 0, hdmi_ctrl_patgen_menu);

        hdmi->sd.ctrl_handler = &hdmi->ctrl_hdl;
        if (hdmi->ctrl_hdl.error) {
                v4l2_ctrl_handler_free(&hdmi->ctrl_hdl);
                return hdmi->ctrl_hdl.error;
        }

        return v4l2_ctrl_handler_setup(&hdmi->ctrl_hdl);
}

int adv748x_hdmi_init(struct adv748x_hdmi *hdmi)
{
        struct adv748x_state *state = adv748x_hdmi_to_state(hdmi);
        static const struct v4l2_dv_timings cea1280x720 =
                V4L2_DV_BT_CEA_1280X720P30;
        int ret;

        hdmi->timings = cea1280x720;

        /* Initialise a default 16:9 aspect ratio */
        hdmi->aspect_ratio.numerator = 16;
        hdmi->aspect_ratio.denominator = 9;

        adv748x_subdev_init(&hdmi->sd, state, &adv748x_ops_hdmi,
                            MEDIA_ENT_F_IO_DTV, "hdmi");

        hdmi->pads[ADV748X_HDMI_SINK].flags = MEDIA_PAD_FL_SINK;
        hdmi->pads[ADV748X_HDMI_SOURCE].flags = MEDIA_PAD_FL_SOURCE;

        ret = media_entity_pads_init(&hdmi->sd.entity,
                                     ADV748X_HDMI_NR_PADS, hdmi->pads);
        if (ret)
                return ret;

        ret = adv748x_hdmi_init_controls(hdmi);
        if (ret)
                goto err_free_media;

        return 0;

err_free_media:
        media_entity_cleanup(&hdmi->sd.entity);

        return ret;
}

void adv748x_hdmi_cleanup(struct adv748x_hdmi *hdmi)
{
        v4l2_device_unregister_subdev(&hdmi->sd);
        media_entity_cleanup(&hdmi->sd.entity);
        v4l2_ctrl_handler_free(&hdmi->ctrl_hdl);
}