/*
 * adv7842 - Analog Devices ADV7842 video decoder driver
 *
 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *
 * 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.
 *
 */

/*
 * References (c = chapter, p = page):
 * REF_01 - Analog devices, ADV7842,
 *              Register Settings Recommendations, Rev. 1.9, April 2011
 * REF_02 - Analog devices, Software User Guide, UG-206,
 *              ADV7842 I2C Register Maps, Rev. 0, November 2010
 * REF_03 - Analog devices, Hardware User Guide, UG-214,
 *              ADV7842 Fast Switching 2:1 HDMI 1.4 Receiver with 3D-Comb
 *              Decoder and Digitizer , Rev. 0, January 2011
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include <linux/workqueue.h>
#include <linux/v4l2-dv-timings.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-dv-timings.h>
#include <media/adv7842.h>

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "debug level (0-2)");

MODULE_DESCRIPTION("Analog Devices ADV7842 video decoder driver");
MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
MODULE_AUTHOR("Martin Bugge <marbugge@cisco.com>");
MODULE_LICENSE("GPL");

/* ADV7842 system clock frequency */
#define ADV7842_fsc (28636360)

/*
**********************************************************************
*
*  Arrays with configuration parameters for the ADV7842
*
**********************************************************************
*/

struct adv7842_state {
        struct adv7842_platform_data pdata;
        struct v4l2_subdev sd;
        struct media_pad pad;
        struct v4l2_ctrl_handler hdl;
        enum adv7842_mode mode;
        struct v4l2_dv_timings timings;
        enum adv7842_vid_std_select vid_std_select;
        v4l2_std_id norm;
        struct {
                u8 edid[256];
                u32 present;
        } hdmi_edid;
        struct {
                u8 edid[256];
                u32 present;
        } vga_edid;
        struct v4l2_fract aspect_ratio;
        u32 rgb_quantization_range;
        bool is_cea_format;
        struct workqueue_struct *work_queues;
        struct delayed_work delayed_work_enable_hotplug;
        bool restart_stdi_once;
        bool hdmi_port_a;

        /* i2c clients */
        struct i2c_client *i2c_sdp_io;
        struct i2c_client *i2c_sdp;
        struct i2c_client *i2c_cp;
        struct i2c_client *i2c_vdp;
        struct i2c_client *i2c_afe;
        struct i2c_client *i2c_hdmi;
        struct i2c_client *i2c_repeater;
        struct i2c_client *i2c_edid;
        struct i2c_client *i2c_infoframe;
        struct i2c_client *i2c_cec;
        struct i2c_client *i2c_avlink;

        /* controls */
        struct v4l2_ctrl *detect_tx_5v_ctrl;
        struct v4l2_ctrl *analog_sampling_phase_ctrl;
        struct v4l2_ctrl *free_run_color_ctrl_manual;
        struct v4l2_ctrl *free_run_color_ctrl;
        struct v4l2_ctrl *rgb_quantization_range_ctrl;
};

/* Unsupported timings. This device cannot support 720p30. */
static const struct v4l2_dv_timings adv7842_timings_exceptions[] = {
        V4L2_DV_BT_CEA_1280X720P30,
        { }
};

static bool adv7842_check_dv_timings(const struct v4l2_dv_timings *t, void *hdl)
{
        int i;

        for (i = 0; adv7842_timings_exceptions[i].bt.width; i++)
                if (v4l2_match_dv_timings(t, adv7842_timings_exceptions + i, 0))
                        return false;
        return true;
}

struct adv7842_video_standards {
        struct v4l2_dv_timings timings;
        u8 vid_std;
        u8 v_freq;
};

/* sorted by number of lines */
static const struct adv7842_video_standards adv7842_prim_mode_comp[] = {
        /* { V4L2_DV_BT_CEA_720X480P59_94, 0x0a, 0x00 }, TODO flickering */
        { V4L2_DV_BT_CEA_720X576P50, 0x0b, 0x00 },
        { V4L2_DV_BT_CEA_1280X720P50, 0x19, 0x01 },
        { V4L2_DV_BT_CEA_1280X720P60, 0x19, 0x00 },
        { V4L2_DV_BT_CEA_1920X1080P24, 0x1e, 0x04 },
        { V4L2_DV_BT_CEA_1920X1080P25, 0x1e, 0x03 },
        { V4L2_DV_BT_CEA_1920X1080P30, 0x1e, 0x02 },
        { V4L2_DV_BT_CEA_1920X1080P50, 0x1e, 0x01 },
        { V4L2_DV_BT_CEA_1920X1080P60, 0x1e, 0x00 },
        /* TODO add 1920x1080P60_RB (CVT timing) */
        { },
};

/* sorted by number of lines */
static const struct adv7842_video_standards adv7842_prim_mode_gr[] = {
        { V4L2_DV_BT_DMT_640X480P60, 0x08, 0x00 },
        { V4L2_DV_BT_DMT_640X480P72, 0x09, 0x00 },
        { V4L2_DV_BT_DMT_640X480P75, 0x0a, 0x00 },
        { V4L2_DV_BT_DMT_640X480P85, 0x0b, 0x00 },
        { V4L2_DV_BT_DMT_800X600P56, 0x00, 0x00 },
        { V4L2_DV_BT_DMT_800X600P60, 0x01, 0x00 },
        { V4L2_DV_BT_DMT_800X600P72, 0x02, 0x00 },
        { V4L2_DV_BT_DMT_800X600P75, 0x03, 0x00 },
        { V4L2_DV_BT_DMT_800X600P85, 0x04, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P60, 0x0c, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P70, 0x0d, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P75, 0x0e, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P85, 0x0f, 0x00 },
        { V4L2_DV_BT_DMT_1280X1024P60, 0x05, 0x00 },
        { V4L2_DV_BT_DMT_1280X1024P75, 0x06, 0x00 },
        { V4L2_DV_BT_DMT_1360X768P60, 0x12, 0x00 },
        { V4L2_DV_BT_DMT_1366X768P60, 0x13, 0x00 },
        { V4L2_DV_BT_DMT_1400X1050P60, 0x14, 0x00 },
        { V4L2_DV_BT_DMT_1400X1050P75, 0x15, 0x00 },
        { V4L2_DV_BT_DMT_1600X1200P60, 0x16, 0x00 }, /* TODO not tested */
        /* TODO add 1600X1200P60_RB (not a DMT timing) */
        { V4L2_DV_BT_DMT_1680X1050P60, 0x18, 0x00 },
        { V4L2_DV_BT_DMT_1920X1200P60_RB, 0x19, 0x00 }, /* TODO not tested */
        { },
};

/* sorted by number of lines */
static const struct adv7842_video_standards adv7842_prim_mode_hdmi_comp[] = {
        { V4L2_DV_BT_CEA_720X480P59_94, 0x0a, 0x00 },
        { V4L2_DV_BT_CEA_720X576P50, 0x0b, 0x00 },
        { V4L2_DV_BT_CEA_1280X720P50, 0x13, 0x01 },
        { V4L2_DV_BT_CEA_1280X720P60, 0x13, 0x00 },
        { V4L2_DV_BT_CEA_1920X1080P24, 0x1e, 0x04 },
        { V4L2_DV_BT_CEA_1920X1080P25, 0x1e, 0x03 },
        { V4L2_DV_BT_CEA_1920X1080P30, 0x1e, 0x02 },
        { V4L2_DV_BT_CEA_1920X1080P50, 0x1e, 0x01 },
        { V4L2_DV_BT_CEA_1920X1080P60, 0x1e, 0x00 },
        { },
};

/* sorted by number of lines */
static const struct adv7842_video_standards adv7842_prim_mode_hdmi_gr[] = {
        { V4L2_DV_BT_DMT_640X480P60, 0x08, 0x00 },
        { V4L2_DV_BT_DMT_640X480P72, 0x09, 0x00 },
        { V4L2_DV_BT_DMT_640X480P75, 0x0a, 0x00 },
        { V4L2_DV_BT_DMT_640X480P85, 0x0b, 0x00 },
        { V4L2_DV_BT_DMT_800X600P56, 0x00, 0x00 },
        { V4L2_DV_BT_DMT_800X600P60, 0x01, 0x00 },
        { V4L2_DV_BT_DMT_800X600P72, 0x02, 0x00 },
        { V4L2_DV_BT_DMT_800X600P75, 0x03, 0x00 },
        { V4L2_DV_BT_DMT_800X600P85, 0x04, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P60, 0x0c, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P70, 0x0d, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P75, 0x0e, 0x00 },
        { V4L2_DV_BT_DMT_1024X768P85, 0x0f, 0x00 },
        { V4L2_DV_BT_DMT_1280X1024P60, 0x05, 0x00 },
        { V4L2_DV_BT_DMT_1280X1024P75, 0x06, 0x00 },
        { },
};

/* ----------------------------------------------------------------------- */

static inline struct adv7842_state *to_state(struct v4l2_subdev *sd)
{
        return container_of(sd, struct adv7842_state, sd);
}

static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
        return &container_of(ctrl->handler, struct adv7842_state, hdl)->sd;
}

static inline unsigned hblanking(const struct v4l2_bt_timings *t)
{
        return V4L2_DV_BT_BLANKING_WIDTH(t);
}

static inline unsigned htotal(const struct v4l2_bt_timings *t)
{
        return V4L2_DV_BT_FRAME_WIDTH(t);
}

static inline unsigned vblanking(const struct v4l2_bt_timings *t)
{
        return V4L2_DV_BT_BLANKING_HEIGHT(t);
}

static inline unsigned vtotal(const struct v4l2_bt_timings *t)
{
        return V4L2_DV_BT_FRAME_HEIGHT(t);
}


/* ----------------------------------------------------------------------- */

static s32 adv_smbus_read_byte_data_check(struct i2c_client *client,
                                          u8 command, bool check)
{
        union i2c_smbus_data data;

        if (!i2c_smbus_xfer(client->adapter, client->addr, client->flags,
                            I2C_SMBUS_READ, command,
                            I2C_SMBUS_BYTE_DATA, &data))
                return data.byte;
        if (check)
                v4l_err(client, "error reading %02x, %02x\n",
                        client->addr, command);
        return -EIO;
}

static s32 adv_smbus_read_byte_data(struct i2c_client *client, u8 command)
{
        int i;

        for (i = 0; i < 3; i++) {
                int ret = adv_smbus_read_byte_data_check(client, command, true);

                if (ret >= 0) {
                        if (i)
                                v4l_err(client, "read ok after %d retries\n", i);
                        return ret;
                }
        }
        v4l_err(client, "read failed\n");
        return -EIO;
}

static s32 adv_smbus_write_byte_data(struct i2c_client *client,
                                     u8 command, u8 value)
{
        union i2c_smbus_data data;
        int err;
        int i;

        data.byte = value;
        for (i = 0; i < 3; i++) {
                err = i2c_smbus_xfer(client->adapter, client->addr,
                                     client->flags,
                                     I2C_SMBUS_WRITE, command,
                                     I2C_SMBUS_BYTE_DATA, &data);
                if (!err)
                        break;
        }
        if (err < 0)
                v4l_err(client, "error writing %02x, %02x, %02x\n",
                        client->addr, command, value);
        return err;
}

static void adv_smbus_write_byte_no_check(struct i2c_client *client,
                                          u8 command, u8 value)
{
        union i2c_smbus_data data;
        data.byte = value;

        i2c_smbus_xfer(client->adapter, client->addr,
                       client->flags,
                       I2C_SMBUS_WRITE, command,
                       I2C_SMBUS_BYTE_DATA, &data);
}

static s32 adv_smbus_write_i2c_block_data(struct i2c_client *client,
                                  u8 command, unsigned length, const u8 *values)
{
        union i2c_smbus_data data;

        if (length > I2C_SMBUS_BLOCK_MAX)
                length = I2C_SMBUS_BLOCK_MAX;
        data.block[0] = length;
        memcpy(data.block + 1, values, length);
        return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
                              I2C_SMBUS_WRITE, command,
                              I2C_SMBUS_I2C_BLOCK_DATA, &data);
}

/* ----------------------------------------------------------------------- */

static inline int io_read(struct v4l2_subdev *sd, u8 reg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        return adv_smbus_read_byte_data(client, reg);
}

static inline int io_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        return adv_smbus_write_byte_data(client, reg, val);
}

static inline int io_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return io_write(sd, reg, (io_read(sd, reg) & mask) | val);
}

static inline int avlink_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_avlink, reg);
}

static inline int avlink_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_avlink, reg, val);
}

static inline int cec_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_cec, reg);
}

static inline int cec_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_cec, reg, val);
}

static inline int cec_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return cec_write(sd, reg, (cec_read(sd, reg) & mask) | val);
}

static inline int infoframe_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_infoframe, reg);
}

static inline int infoframe_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_infoframe, reg, val);
}

static inline int sdp_io_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_sdp_io, reg);
}

static inline int sdp_io_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_sdp_io, reg, val);
}

static inline int sdp_io_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return sdp_io_write(sd, reg, (sdp_io_read(sd, reg) & mask) | val);
}

static inline int sdp_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_sdp, reg);
}

static inline int sdp_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_sdp, reg, val);
}

static inline int sdp_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return sdp_write(sd, reg, (sdp_read(sd, reg) & mask) | val);
}

static inline int afe_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_afe, reg);
}

static inline int afe_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_afe, reg, val);
}

static inline int afe_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return afe_write(sd, reg, (afe_read(sd, reg) & mask) | val);
}

static inline int rep_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_repeater, reg);
}

static inline int rep_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_repeater, reg, val);
}

static inline int rep_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return rep_write(sd, reg, (rep_read(sd, reg) & mask) | val);
}

static inline int edid_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_edid, reg);
}

static inline int edid_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_edid, reg, val);
}

static inline int hdmi_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_hdmi, reg);
}

static inline int hdmi_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_hdmi, reg, val);
}

static inline int hdmi_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return hdmi_write(sd, reg, (hdmi_read(sd, reg) & mask) | val);
}

static inline int cp_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_cp, reg);
}

static inline int cp_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_cp, reg, val);
}

static inline int cp_write_and_or(struct v4l2_subdev *sd, u8 reg, u8 mask, u8 val)
{
        return cp_write(sd, reg, (cp_read(sd, reg) & mask) | val);
}

static inline int vdp_read(struct v4l2_subdev *sd, u8 reg)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_read_byte_data(state->i2c_vdp, reg);
}

static inline int vdp_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
        struct adv7842_state *state = to_state(sd);

        return adv_smbus_write_byte_data(state->i2c_vdp, reg, val);
}

static void main_reset(struct v4l2_subdev *sd)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        v4l2_dbg(1, debug, sd, "%s:\n", __func__);

        adv_smbus_write_byte_no_check(client, 0xff, 0x80);

        mdelay(5);
}

/* ----------------------------------------------------------------------- */

static inline bool is_digital_input(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);

        return state->mode == ADV7842_MODE_HDMI;
}

static const struct v4l2_dv_timings_cap adv7842_timings_cap_analog = {
        .type = V4L2_DV_BT_656_1120,
        /* keep this initialization for compatibility with GCC < 4.4.6 */
        .reserved = { 0 },
        V4L2_INIT_BT_TIMINGS(0, 1920, 0, 1200, 25000000, 170000000,
                V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
                        V4L2_DV_BT_STD_GTF | V4L2_DV_BT_STD_CVT,
                V4L2_DV_BT_CAP_PROGRESSIVE | V4L2_DV_BT_CAP_REDUCED_BLANKING |
                        V4L2_DV_BT_CAP_CUSTOM)
};

static const struct v4l2_dv_timings_cap adv7842_timings_cap_digital = {
        .type = V4L2_DV_BT_656_1120,
        /* keep this initialization for compatibility with GCC < 4.4.6 */
        .reserved = { 0 },
        V4L2_INIT_BT_TIMINGS(0, 1920, 0, 1200, 25000000, 225000000,
                V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
                        V4L2_DV_BT_STD_GTF | V4L2_DV_BT_STD_CVT,
                V4L2_DV_BT_CAP_PROGRESSIVE | V4L2_DV_BT_CAP_REDUCED_BLANKING |
                        V4L2_DV_BT_CAP_CUSTOM)
};

static inline const struct v4l2_dv_timings_cap *
adv7842_get_dv_timings_cap(struct v4l2_subdev *sd)
{
        return is_digital_input(sd) ? &adv7842_timings_cap_digital :
                                      &adv7842_timings_cap_analog;
}

/* ----------------------------------------------------------------------- */

static void adv7842_delayed_work_enable_hotplug(struct work_struct *work)
{
        struct delayed_work *dwork = to_delayed_work(work);
        struct adv7842_state *state = container_of(dwork,
                        struct adv7842_state, delayed_work_enable_hotplug);
        struct v4l2_subdev *sd = &state->sd;
        int present = state->hdmi_edid.present;
        u8 mask = 0;

        v4l2_dbg(2, debug, sd, "%s: enable hotplug on ports: 0x%x\n",
                        __func__, present);

        if (present & (0x04 << ADV7842_EDID_PORT_A))
                mask |= 0x20;
        if (present & (0x04 << ADV7842_EDID_PORT_B))
                mask |= 0x10;
        io_write_and_or(sd, 0x20, 0xcf, mask);
}

static int edid_write_vga_segment(struct v4l2_subdev *sd)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct adv7842_state *state = to_state(sd);
        const u8 *val = state->vga_edid.edid;
        int err = 0;
        int i;

        v4l2_dbg(2, debug, sd, "%s: write EDID on VGA port\n", __func__);

        /* HPA disable on port A and B */
        io_write_and_or(sd, 0x20, 0xcf, 0x00);

        /* Disable I2C access to internal EDID ram from VGA DDC port */
        rep_write_and_or(sd, 0x7f, 0x7f, 0x00);

        /* edid segment pointer '1' for VGA port */
        rep_write_and_or(sd, 0x77, 0xef, 0x10);

        for (i = 0; !err && i < 256; i += I2C_SMBUS_BLOCK_MAX)
                err = adv_smbus_write_i2c_block_data(state->i2c_edid, i,
                                             I2C_SMBUS_BLOCK_MAX, val + i);
        if (err)
                return err;

        /* Calculates the checksums and enables I2C access
         * to internal EDID ram from VGA DDC port.
         */
        rep_write_and_or(sd, 0x7f, 0x7f, 0x80);

        for (i = 0; i < 1000; i++) {
                if (rep_read(sd, 0x79) & 0x20)
                        break;
                mdelay(1);
        }
        if (i == 1000) {
                v4l_err(client, "error enabling edid on VGA port\n");
                return -EIO;
        }

        /* enable hotplug after 200 ms */
        queue_delayed_work(state->work_queues,
                        &state->delayed_work_enable_hotplug, HZ / 5);

        return 0;
}

static int edid_spa_location(const u8 *edid)
{
        u8 d;

        /*
         * TODO, improve and update for other CEA extensions
         * currently only for 1 segment (256 bytes),
         * i.e. 1 extension block and CEA revision 3.
         */
        if ((edid[0x7e] != 1) ||
            (edid[0x80] != 0x02) ||
            (edid[0x81] != 0x03)) {
                return -EINVAL;
        }
        /*
         * search Vendor Specific Data Block (tag 3)
         */
        d = edid[0x82] & 0x7f;
        if (d > 4) {
                int i = 0x84;
                int end = 0x80 + d;
                do {
                        u8 tag = edid[i]>>5;
                        u8 len = edid[i] & 0x1f;

                        if ((tag == 3) && (len >= 5))
                                return i + 4;
                        i += len + 1;
                } while (i < end);
        }
        return -EINVAL;
}

static int edid_write_hdmi_segment(struct v4l2_subdev *sd, u8 port)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct adv7842_state *state = to_state(sd);
        const u8 *val = state->hdmi_edid.edid;
        int spa_loc = edid_spa_location(val);
        int err = 0;
        int i;

        v4l2_dbg(2, debug, sd, "%s: write EDID on port %c (spa at 0x%x)\n",
                        __func__, (port == ADV7842_EDID_PORT_A) ? 'A' : 'B', spa_loc);

        /* HPA disable on port A and B */
        io_write_and_or(sd, 0x20, 0xcf, 0x00);

        /* Disable I2C access to internal EDID ram from HDMI DDC ports */
        rep_write_and_or(sd, 0x77, 0xf3, 0x00);

        if (!state->hdmi_edid.present)
                return 0;

        /* edid segment pointer '0' for HDMI ports */
        rep_write_and_or(sd, 0x77, 0xef, 0x00);

        for (i = 0; !err && i < 256; i += I2C_SMBUS_BLOCK_MAX)
                err = adv_smbus_write_i2c_block_data(state->i2c_edid, i,
                                                     I2C_SMBUS_BLOCK_MAX, val + i);
        if (err)
                return err;

        if (spa_loc < 0)
                spa_loc = 0xc0; /* Default value [REF_02, p. 199] */

        if (port == ADV7842_EDID_PORT_A) {
                rep_write(sd, 0x72, val[spa_loc]);
                rep_write(sd, 0x73, val[spa_loc + 1]);
        } else {
                rep_write(sd, 0x74, val[spa_loc]);
                rep_write(sd, 0x75, val[spa_loc + 1]);
        }
        rep_write(sd, 0x76, spa_loc & 0xff);
        rep_write_and_or(sd, 0x77, 0xbf, (spa_loc >> 2) & 0x40);

        /* Calculates the checksums and enables I2C access to internal
         * EDID ram from HDMI DDC ports
         */
        rep_write_and_or(sd, 0x77, 0xf3, state->hdmi_edid.present);

        for (i = 0; i < 1000; i++) {
                if (rep_read(sd, 0x7d) & state->hdmi_edid.present)
                        break;
                mdelay(1);
        }
        if (i == 1000) {
                v4l_err(client, "error enabling edid on port %c\n",
                                (port == ADV7842_EDID_PORT_A) ? 'A' : 'B');
                return -EIO;
        }

        /* enable hotplug after 200 ms */
        queue_delayed_work(state->work_queues,
                        &state->delayed_work_enable_hotplug, HZ / 5);

        return 0;
}

/* ----------------------------------------------------------------------- */

#ifdef CONFIG_VIDEO_ADV_DEBUG
static void adv7842_inv_register(struct v4l2_subdev *sd)
{
        v4l2_info(sd, "0x000-0x0ff: IO Map\n");
        v4l2_info(sd, "0x100-0x1ff: AVLink Map\n");
        v4l2_info(sd, "0x200-0x2ff: CEC Map\n");
        v4l2_info(sd, "0x300-0x3ff: InfoFrame Map\n");
        v4l2_info(sd, "0x400-0x4ff: SDP_IO Map\n");
        v4l2_info(sd, "0x500-0x5ff: SDP Map\n");
        v4l2_info(sd, "0x600-0x6ff: AFE Map\n");
        v4l2_info(sd, "0x700-0x7ff: Repeater Map\n");
        v4l2_info(sd, "0x800-0x8ff: EDID Map\n");
        v4l2_info(sd, "0x900-0x9ff: HDMI Map\n");
        v4l2_info(sd, "0xa00-0xaff: CP Map\n");
        v4l2_info(sd, "0xb00-0xbff: VDP Map\n");
}

static int adv7842_g_register(struct v4l2_subdev *sd,
                              struct v4l2_dbg_register *reg)
{
        reg->size = 1;
        switch (reg->reg >> 8) {
        case 0:
                reg->val = io_read(sd, reg->reg & 0xff);
                break;
        case 1:
                reg->val = avlink_read(sd, reg->reg & 0xff);
                break;
        case 2:
                reg->val = cec_read(sd, reg->reg & 0xff);
                break;
        case 3:
                reg->val = infoframe_read(sd, reg->reg & 0xff);
                break;
        case 4:
                reg->val = sdp_io_read(sd, reg->reg & 0xff);
                break;
        case 5:
                reg->val = sdp_read(sd, reg->reg & 0xff);
                break;
        case 6:
                reg->val = afe_read(sd, reg->reg & 0xff);
                break;
        case 7:
                reg->val = rep_read(sd, reg->reg & 0xff);
                break;
        case 8:
                reg->val = edid_read(sd, reg->reg & 0xff);
                break;
        case 9:
                reg->val = hdmi_read(sd, reg->reg & 0xff);
                break;
        case 0xa:
                reg->val = cp_read(sd, reg->reg & 0xff);
                break;
        case 0xb:
                reg->val = vdp_read(sd, reg->reg & 0xff);
                break;
        default:
                v4l2_info(sd, "Register %03llx not supported\n", reg->reg);
                adv7842_inv_register(sd);
                break;
        }
        return 0;
}

static int adv7842_s_register(struct v4l2_subdev *sd,
                const struct v4l2_dbg_register *reg)
{
        u8 val = reg->val & 0xff;

        switch (reg->reg >> 8) {
        case 0:
                io_write(sd, reg->reg & 0xff, val);
                break;
        case 1:
                avlink_write(sd, reg->reg & 0xff, val);
                break;
        case 2:
                cec_write(sd, reg->reg & 0xff, val);
                break;
        case 3:
                infoframe_write(sd, reg->reg & 0xff, val);
                break;
        case 4:
                sdp_io_write(sd, reg->reg & 0xff, val);
                break;
        case 5:
                sdp_write(sd, reg->reg & 0xff, val);
                break;
        case 6:
                afe_write(sd, reg->reg & 0xff, val);
                break;
        case 7:
                rep_write(sd, reg->reg & 0xff, val);
                break;
        case 8:
                edid_write(sd, reg->reg & 0xff, val);
                break;
        case 9:
                hdmi_write(sd, reg->reg & 0xff, val);
                break;
        case 0xa:
                cp_write(sd, reg->reg & 0xff, val);
                break;
        case 0xb:
                vdp_write(sd, reg->reg & 0xff, val);
                break;
        default:
                v4l2_info(sd, "Register %03llx not supported\n", reg->reg);
                adv7842_inv_register(sd);
                break;
        }
        return 0;
}
#endif

static int adv7842_s_detect_tx_5v_ctrl(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);
        int prev = v4l2_ctrl_g_ctrl(state->detect_tx_5v_ctrl);
        u8 reg_io_6f = io_read(sd, 0x6f);
        int val = 0;

        if (reg_io_6f & 0x02)
                val |= 1; /* port A */
        if (reg_io_6f & 0x01)
                val |= 2; /* port B */

        v4l2_dbg(1, debug, sd, "%s: 0x%x -> 0x%x\n", __func__, prev, val);

        if (val != prev)
                return v4l2_ctrl_s_ctrl(state->detect_tx_5v_ctrl, val);
        return 0;
}

static int find_and_set_predefined_video_timings(struct v4l2_subdev *sd,
                u8 prim_mode,
                const struct adv7842_video_standards *predef_vid_timings,
                const struct v4l2_dv_timings *timings)
{
        int i;

        for (i = 0; predef_vid_timings[i].timings.bt.width; i++) {
                if (!v4l2_match_dv_timings(timings, &predef_vid_timings[i].timings,
                                          is_digital_input(sd) ? 250000 : 1000000))
                        continue;
                /* video std */
                io_write(sd, 0x00, predef_vid_timings[i].vid_std);
                /* v_freq and prim mode */
                io_write(sd, 0x01, (predef_vid_timings[i].v_freq << 4) + prim_mode);
                return 0;
        }

        return -1;
}

static int configure_predefined_video_timings(struct v4l2_subdev *sd,
                struct v4l2_dv_timings *timings)
{
        struct adv7842_state *state = to_state(sd);
        int err;

        v4l2_dbg(1, debug, sd, "%s\n", __func__);

        /* reset to default values */
        io_write(sd, 0x16, 0x43);
        io_write(sd, 0x17, 0x5a);
        /* disable embedded syncs for auto graphics mode */
        cp_write_and_or(sd, 0x81, 0xef, 0x00);
        cp_write(sd, 0x26, 0x00);
        cp_write(sd, 0x27, 0x00);
        cp_write(sd, 0x28, 0x00);
        cp_write(sd, 0x29, 0x00);
        cp_write(sd, 0x8f, 0x40);
        cp_write(sd, 0x90, 0x00);
        cp_write(sd, 0xa5, 0x00);
        cp_write(sd, 0xa6, 0x00);
        cp_write(sd, 0xa7, 0x00);
        cp_write(sd, 0xab, 0x00);
        cp_write(sd, 0xac, 0x00);

        switch (state->mode) {
        case ADV7842_MODE_COMP:
        case ADV7842_MODE_RGB:
                err = find_and_set_predefined_video_timings(sd,
                                0x01, adv7842_prim_mode_comp, timings);
                if (err)
                        err = find_and_set_predefined_video_timings(sd,
                                        0x02, adv7842_prim_mode_gr, timings);
                break;
        case ADV7842_MODE_HDMI:
                err = find_and_set_predefined_video_timings(sd,
                                0x05, adv7842_prim_mode_hdmi_comp, timings);
                if (err)
                        err = find_and_set_predefined_video_timings(sd,
                                        0x06, adv7842_prim_mode_hdmi_gr, timings);
                break;
        default:
                v4l2_dbg(2, debug, sd, "%s: Unknown mode %d\n",
                                __func__, state->mode);
                err = -1;
                break;
        }


        return err;
}

static void configure_custom_video_timings(struct v4l2_subdev *sd,
                const struct v4l2_bt_timings *bt)
{
        struct adv7842_state *state = to_state(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        u32 width = htotal(bt);
        u32 height = vtotal(bt);
        u16 cp_start_sav = bt->hsync + bt->hbackporch - 4;
        u16 cp_start_eav = width - bt->hfrontporch;
        u16 cp_start_vbi = height - bt->vfrontporch + 1;
        u16 cp_end_vbi = bt->vsync + bt->vbackporch + 1;
        u16 ch1_fr_ll = (((u32)bt->pixelclock / 100) > 0) ?
                ((width * (ADV7842_fsc / 100)) / ((u32)bt->pixelclock / 100)) : 0;
        const u8 pll[2] = {
                0xc0 | ((width >> 8) & 0x1f),
                width & 0xff
        };

        v4l2_dbg(2, debug, sd, "%s\n", __func__);

        switch (state->mode) {
        case ADV7842_MODE_COMP:
        case ADV7842_MODE_RGB:
                /* auto graphics */
                io_write(sd, 0x00, 0x07); /* video std */
                io_write(sd, 0x01, 0x02); /* prim mode */
                /* enable embedded syncs for auto graphics mode */
                cp_write_and_or(sd, 0x81, 0xef, 0x10);

                /* Should only be set in auto-graphics mode [REF_02, p. 91-92] */
                /* setup PLL_DIV_MAN_EN and PLL_DIV_RATIO */
                /* IO-map reg. 0x16 and 0x17 should be written in sequence */
                if (adv_smbus_write_i2c_block_data(client, 0x16, 2, pll)) {
                        v4l2_err(sd, "writing to reg 0x16 and 0x17 failed\n");
                        break;
                }

                /* active video - horizontal timing */

                cp_write(sd, 0x26, (cp_start_sav >> 8) & 0xf);
                cp_write(sd, 0x27, (cp_start_sav & 0xff));
                cp_write(sd, 0x28, (cp_start_eav >> 8) & 0xf);
                cp_write(sd, 0x29, (cp_start_eav & 0xff));

                /* active video - vertical timing */
                cp_write(sd, 0xa5, (cp_start_vbi >> 4) & 0xff);
                cp_write(sd, 0xa6, ((cp_start_vbi & 0xf) << 4) |
                                        ((cp_end_vbi >> 8) & 0xf));
                cp_write(sd, 0xa7, cp_end_vbi & 0xff);
                break;
        case ADV7842_MODE_HDMI:
                /* set default prim_mode/vid_std for HDMI
                   according to [REF_03, c. 4.2] */
                io_write(sd, 0x00, 0x02); /* video std */
                io_write(sd, 0x01, 0x06); /* prim mode */
                break;
        default:
                v4l2_dbg(2, debug, sd, "%s: Unknown mode %d\n",
                                __func__, state->mode);
                break;
        }

        cp_write(sd, 0x8f, (ch1_fr_ll >> 8) & 0x7);
        cp_write(sd, 0x90, ch1_fr_ll & 0xff);
        cp_write(sd, 0xab, (height >> 4) & 0xff);
        cp_write(sd, 0xac, (height & 0x0f) << 4);
}

static void set_rgb_quantization_range(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);

        v4l2_dbg(2, debug, sd, "%s: rgb_quantization_range = %d\n",
                       __func__, state->rgb_quantization_range);

        switch (state->rgb_quantization_range) {
        case V4L2_DV_RGB_RANGE_AUTO:
                if (state->mode == ADV7842_MODE_RGB) {
                        /* Receiving analog RGB signal
                         * Set RGB full range (0-255) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x10);
                        break;
                }

                if (state->mode == ADV7842_MODE_COMP) {
                        /* Receiving analog YPbPr signal
                         * Set automode */
                        io_write_and_or(sd, 0x02, 0x0f, 0xf0);
                        break;
                }

                if (hdmi_read(sd, 0x05) & 0x80) {
                        /* Receiving HDMI signal
                         * Set automode */
                        io_write_and_or(sd, 0x02, 0x0f, 0xf0);
                        break;
                }

                /* Receiving DVI-D signal
                 * ADV7842 selects RGB limited range regardless of
                 * input format (CE/IT) in automatic mode */
                if (state->timings.bt.standards & V4L2_DV_BT_STD_CEA861) {
                        /* RGB limited range (16-235) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x00);
                } else {
                        /* RGB full range (0-255) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x10);
                }
                break;
        case V4L2_DV_RGB_RANGE_LIMITED:
                if (state->mode == ADV7842_MODE_COMP) {
                        /* YCrCb limited range (16-235) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x20);
                } else {
                        /* RGB limited range (16-235) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x00);
                }
                break;
        case V4L2_DV_RGB_RANGE_FULL:
                if (state->mode == ADV7842_MODE_COMP) {
                        /* YCrCb full range (0-255) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x60);
                } else {
                        /* RGB full range (0-255) */
                        io_write_and_or(sd, 0x02, 0x0f, 0x10);
                }
                break;
        }
}

static int adv7842_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct v4l2_subdev *sd = to_sd(ctrl);
        struct adv7842_state *state = to_state(sd);

        /* TODO SDP ctrls
           contrast/brightness/hue/free run is acting a bit strange,
           not sure if sdp csc is correct.
         */
        switch (ctrl->id) {
        /* standard ctrls */
        case V4L2_CID_BRIGHTNESS:
                cp_write(sd, 0x3c, ctrl->val);
                sdp_write(sd, 0x14, ctrl->val);
                /* ignore lsb sdp 0x17[3:2] */
                return 0;
        case V4L2_CID_CONTRAST:
                cp_write(sd, 0x3a, ctrl->val);
                sdp_write(sd, 0x13, ctrl->val);
                /* ignore lsb sdp 0x17[1:0] */
                return 0;
        case V4L2_CID_SATURATION:
                cp_write(sd, 0x3b, ctrl->val);
                sdp_write(sd, 0x15, ctrl->val);
                /* ignore lsb sdp 0x17[5:4] */
                return 0;
        case V4L2_CID_HUE:
                cp_write(sd, 0x3d, ctrl->val);
                sdp_write(sd, 0x16, ctrl->val);
                /* ignore lsb sdp 0x17[7:6] */
                return 0;
                /* custom ctrls */
        case V4L2_CID_ADV_RX_ANALOG_SAMPLING_PHASE:
                afe_write(sd, 0xc8, ctrl->val);
                return 0;
        case V4L2_CID_ADV_RX_FREE_RUN_COLOR_MANUAL:
                cp_write_and_or(sd, 0xbf, ~0x04, (ctrl->val << 2));
                sdp_write_and_or(sd, 0xdd, ~0x04, (ctrl->val << 2));
                return 0;
        case V4L2_CID_ADV_RX_FREE_RUN_COLOR: {
                u8 R = (ctrl->val & 0xff0000) >> 16;
                u8 G = (ctrl->val & 0x00ff00) >> 8;
                u8 B = (ctrl->val & 0x0000ff);
                /* RGB -> YUV, numerical approximation */
                int Y = 66 * R + 129 * G + 25 * B;
                int U = -38 * R - 74 * G + 112 * B;
                int V = 112 * R - 94 * G - 18 * B;

                /* Scale down to 8 bits with rounding */
                Y = (Y + 128) >> 8;
                U = (U + 128) >> 8;
                V = (V + 128) >> 8;
                /* make U,V positive */
                Y += 16;
                U += 128;
                V += 128;

                v4l2_dbg(1, debug, sd, "R %x, G %x, B %x\n", R, G, B);
                v4l2_dbg(1, debug, sd, "Y %x, U %x, V %x\n", Y, U, V);

                /* CP */
                cp_write(sd, 0xc1, R);
                cp_write(sd, 0xc0, G);
                cp_write(sd, 0xc2, B);
                /* SDP */
                sdp_write(sd, 0xde, Y);
                sdp_write(sd, 0xdf, (V & 0xf0) | ((U >> 4) & 0x0f));
                return 0;
        }
        case V4L2_CID_DV_RX_RGB_RANGE:
                state->rgb_quantization_range = ctrl->val;
                set_rgb_quantization_range(sd);
                return 0;
        }
        return -EINVAL;
}

static inline bool no_power(struct v4l2_subdev *sd)
{
        return io_read(sd, 0x0c) & 0x24;
}

static inline bool no_cp_signal(struct v4l2_subdev *sd)
{
        return ((cp_read(sd, 0xb5) & 0xd0) != 0xd0) || !(cp_read(sd, 0xb1) & 0x80);
}

static inline bool is_hdmi(struct v4l2_subdev *sd)
{
        return hdmi_read(sd, 0x05) & 0x80;
}

static int adv7842_g_input_status(struct v4l2_subdev *sd, u32 *status)
{
        struct adv7842_state *state = to_state(sd);

        *status = 0;

        if (io_read(sd, 0x0c) & 0x24)
                *status |= V4L2_IN_ST_NO_POWER;

        if (state->mode == ADV7842_MODE_SDP) {
                /* status from SDP block */
                if (!(sdp_read(sd, 0x5A) & 0x01))
                        *status |= V4L2_IN_ST_NO_SIGNAL;

                v4l2_dbg(1, debug, sd, "%s: SDP status = 0x%x\n",
                                __func__, *status);
                return 0;
        }
        /* status from CP block */
        if ((cp_read(sd, 0xb5) & 0xd0) != 0xd0 ||
                        !(cp_read(sd, 0xb1) & 0x80))
                /* TODO channel 2 */
                *status |= V4L2_IN_ST_NO_SIGNAL;

        if (is_digital_input(sd) && ((io_read(sd, 0x74) & 0x03) != 0x03))
                *status |= V4L2_IN_ST_NO_SIGNAL;

        v4l2_dbg(1, debug, sd, "%s: CP status = 0x%x\n",
                        __func__, *status);

        return 0;
}

struct stdi_readback {
        u16 bl, lcf, lcvs;
        u8 hs_pol, vs_pol;
        bool interlaced;
};

static int stdi2dv_timings(struct v4l2_subdev *sd,
                struct stdi_readback *stdi,
                struct v4l2_dv_timings *timings)
{
        struct adv7842_state *state = to_state(sd);
        u32 hfreq = (ADV7842_fsc * 8) / stdi->bl;
        u32 pix_clk;
        int i;

        for (i = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
                const struct v4l2_bt_timings *bt = &v4l2_dv_timings_presets[i].bt;

                if (!v4l2_valid_dv_timings(&v4l2_dv_timings_presets[i],
                                           adv7842_get_dv_timings_cap(sd),
                                           adv7842_check_dv_timings, NULL))
                        continue;
                if (vtotal(bt) != stdi->lcf + 1)
                        continue;
                if (bt->vsync != stdi->lcvs)
                        continue;

                pix_clk = hfreq * htotal(bt);

                if ((pix_clk < bt->pixelclock + 1000000) &&
                    (pix_clk > bt->pixelclock - 1000000)) {
                        *timings = v4l2_dv_timings_presets[i];
                        return 0;
                }
        }

        if (v4l2_detect_cvt(stdi->lcf + 1, hfreq, stdi->lcvs,
                        (stdi->hs_pol == '+' ? V4L2_DV_HSYNC_POS_POL : 0) |
                        (stdi->vs_pol == '+' ? V4L2_DV_VSYNC_POS_POL : 0),
                            timings))
                return 0;
        if (v4l2_detect_gtf(stdi->lcf + 1, hfreq, stdi->lcvs,
                        (stdi->hs_pol == '+' ? V4L2_DV_HSYNC_POS_POL : 0) |
                        (stdi->vs_pol == '+' ? V4L2_DV_VSYNC_POS_POL : 0),
                            state->aspect_ratio, timings))
                return 0;

        v4l2_dbg(2, debug, sd,
                "%s: No format candidate found for lcvs = %d, lcf=%d, bl = %d, %chsync, %cvsync\n",
                __func__, stdi->lcvs, stdi->lcf, stdi->bl,
                stdi->hs_pol, stdi->vs_pol);
        return -1;
}

static int read_stdi(struct v4l2_subdev *sd, struct stdi_readback *stdi)
{
        u32 status;

        adv7842_g_input_status(sd, &status);
        if (status & V4L2_IN_ST_NO_SIGNAL) {
                v4l2_dbg(2, debug, sd, "%s: no signal\n", __func__);
                return -ENOLINK;
        }

        stdi->bl = ((cp_read(sd, 0xb1) & 0x3f) << 8) | cp_read(sd, 0xb2);
        stdi->lcf = ((cp_read(sd, 0xb3) & 0x7) << 8) | cp_read(sd, 0xb4);
        stdi->lcvs = cp_read(sd, 0xb3) >> 3;

        if ((cp_read(sd, 0xb5) & 0x80) && ((cp_read(sd, 0xb5) & 0x03) == 0x01)) {
                stdi->hs_pol = ((cp_read(sd, 0xb5) & 0x10) ?
                        ((cp_read(sd, 0xb5) & 0x08) ? '+' : '-') : 'x');
                stdi->vs_pol = ((cp_read(sd, 0xb5) & 0x40) ?
                        ((cp_read(sd, 0xb5) & 0x20) ? '+' : '-') : 'x');
        } else {
                stdi->hs_pol = 'x';
                stdi->vs_pol = 'x';
        }
        stdi->interlaced = (cp_read(sd, 0xb1) & 0x40) ? true : false;

        if (stdi->lcf < 239 || stdi->bl < 8 || stdi->bl == 0x3fff) {
                v4l2_dbg(2, debug, sd, "%s: invalid signal\n", __func__);
                return -ENOLINK;
        }

        v4l2_dbg(2, debug, sd,
                "%s: lcf (frame height - 1) = %d, bl = %d, lcvs (vsync) = %d, %chsync, %cvsync, %s\n",
                 __func__, stdi->lcf, stdi->bl, stdi->lcvs,
                 stdi->hs_pol, stdi->vs_pol,
                 stdi->interlaced ? "interlaced" : "progressive");

        return 0;
}

static int adv7842_enum_dv_timings(struct v4l2_subdev *sd,
                                   struct v4l2_enum_dv_timings *timings)
{
        return v4l2_enum_dv_timings_cap(timings,
                adv7842_get_dv_timings_cap(sd), adv7842_check_dv_timings, NULL);
}

static int adv7842_dv_timings_cap(struct v4l2_subdev *sd,
                                  struct v4l2_dv_timings_cap *cap)
{
        *cap = *adv7842_get_dv_timings_cap(sd);
        return 0;
}

/* Fill the optional fields .standards and .flags in struct v4l2_dv_timings
   if the format is listed in adv7842_timings[] */
static void adv7842_fill_optional_dv_timings_fields(struct v4l2_subdev *sd,
                struct v4l2_dv_timings *timings)
{
        v4l2_find_dv_timings_cap(timings, adv7842_get_dv_timings_cap(sd),
                        is_digital_input(sd) ? 250000 : 1000000,
                        adv7842_check_dv_timings, NULL);
}

static int adv7842_query_dv_timings(struct v4l2_subdev *sd,
                                    struct v4l2_dv_timings *timings)
{
        struct adv7842_state *state = to_state(sd);
        struct v4l2_bt_timings *bt = &timings->bt;
        struct stdi_readback stdi = { 0 };

        v4l2_dbg(1, debug, sd, "%s:\n", __func__);

        /* SDP block */
        if (state->mode == ADV7842_MODE_SDP)
                return -ENODATA;

        /* read STDI */
        if (read_stdi(sd, &stdi)) {
                state->restart_stdi_once = true;
                v4l2_dbg(1, debug, sd, "%s: no valid signal\n", __func__);
                return -ENOLINK;
        }
        bt->interlaced = stdi.interlaced ?
                V4L2_DV_INTERLACED : V4L2_DV_PROGRESSIVE;

        if (is_digital_input(sd)) {
                uint32_t freq;

                timings->type = V4L2_DV_BT_656_1120;

                bt->width = (hdmi_read(sd, 0x07) & 0x0f) * 256 + hdmi_read(sd, 0x08);
                bt->height = (hdmi_read(sd, 0x09) & 0x0f) * 256 + hdmi_read(sd, 0x0a);
                freq = (hdmi_read(sd, 0x06) * 1000000) +
                       ((hdmi_read(sd, 0x3b) & 0x30) >> 4) * 250000;

                if (is_hdmi(sd)) {
                        /* adjust for deep color mode */
                        freq = freq * 8 / (((hdmi_read(sd, 0x0b) & 0xc0) >> 5) + 8);
                }
                bt->pixelclock = freq;
                bt->hfrontporch = (hdmi_read(sd, 0x20) & 0x03) * 256 +
                        hdmi_read(sd, 0x21);
                bt->hsync = (hdmi_read(sd, 0x22) & 0x03) * 256 +
                        hdmi_read(sd, 0x23);
                bt->hbackporch = (hdmi_read(sd, 0x24) & 0x03) * 256 +
                        hdmi_read(sd, 0x25);
                bt->vfrontporch = ((hdmi_read(sd, 0x2a) & 0x1f) * 256 +
                        hdmi_read(sd, 0x2b)) / 2;
                bt->vsync = ((hdmi_read(sd, 0x2e) & 0x1f) * 256 +
                        hdmi_read(sd, 0x2f)) / 2;
                bt->vbackporch = ((hdmi_read(sd, 0x32) & 0x1f) * 256 +
                        hdmi_read(sd, 0x33)) / 2;
                bt->polarities = ((hdmi_read(sd, 0x05) & 0x10) ? V4L2_DV_VSYNC_POS_POL : 0) |
                        ((hdmi_read(sd, 0x05) & 0x20) ? V4L2_DV_HSYNC_POS_POL : 0);
                if (bt->interlaced == V4L2_DV_INTERLACED) {
                        bt->height += (hdmi_read(sd, 0x0b) & 0x0f) * 256 +
                                        hdmi_read(sd, 0x0c);
                        bt->il_vfrontporch = ((hdmi_read(sd, 0x2c) & 0x1f) * 256 +
                                        hdmi_read(sd, 0x2d)) / 2;
                        bt->il_vsync = ((hdmi_read(sd, 0x30) & 0x1f) * 256 +
                                        hdmi_read(sd, 0x31)) / 2;
                        bt->vbackporch = ((hdmi_read(sd, 0x34) & 0x1f) * 256 +
                                        hdmi_read(sd, 0x35)) / 2;
                }
                adv7842_fill_optional_dv_timings_fields(sd, timings);
        } else {
                /* find format
                 * Since LCVS values are inaccurate [REF_03, p. 339-340],
                 * stdi2dv_timings() is called with lcvs +-1 if the first attempt fails.
                 */
                if (!stdi2dv_timings(sd, &stdi, timings))
                        goto found;
                stdi.lcvs += 1;
                v4l2_dbg(1, debug, sd, "%s: lcvs + 1 = %d\n", __func__, stdi.lcvs);
                if (!stdi2dv_timings(sd, &stdi, timings))
                        goto found;
                stdi.lcvs -= 2;
                v4l2_dbg(1, debug, sd, "%s: lcvs - 1 = %d\n", __func__, stdi.lcvs);
                if (stdi2dv_timings(sd, &stdi, timings)) {
                        /*
                         * The STDI block may measure wrong values, especially
                         * for lcvs and lcf. If the driver can not find any
                         * valid timing, the STDI block is restarted to measure
                         * the video timings again. The function will return an
                         * error, but the restart of STDI will generate a new
                         * STDI interrupt and the format detection process will
                         * restart.
                         */
                        if (state->restart_stdi_once) {
                                v4l2_dbg(1, debug, sd, "%s: restart STDI\n", __func__);
                                /* TODO restart STDI for Sync Channel 2 */
                                /* enter one-shot mode */
                                cp_write_and_or(sd, 0x86, 0xf9, 0x00);
                                /* trigger STDI restart */
                                cp_write_and_or(sd, 0x86, 0xf9, 0x04);
                                /* reset to continuous mode */
                                cp_write_and_or(sd, 0x86, 0xf9, 0x02);
                                state->restart_stdi_once = false;
                                return -ENOLINK;
                        }
                        v4l2_dbg(1, debug, sd, "%s: format not supported\n", __func__);
                        return -ERANGE;
                }
                state->restart_stdi_once = true;
        }
found:

        if (debug > 1)
                v4l2_print_dv_timings(sd->name, "adv7842_query_dv_timings:",
                                timings, true);
        return 0;
}

static int adv7842_s_dv_timings(struct v4l2_subdev *sd,
                                struct v4l2_dv_timings *timings)
{
        struct adv7842_state *state = to_state(sd);
        struct v4l2_bt_timings *bt;
        int err;

        v4l2_dbg(1, debug, sd, "%s:\n", __func__);

        if (state->mode == ADV7842_MODE_SDP)
                return -ENODATA;

        if (v4l2_match_dv_timings(&state->timings, timings, 0)) {
                v4l2_dbg(1, debug, sd, "%s: no change\n", __func__);
                return 0;
        }

        bt = &timings->bt;

        if (!v4l2_valid_dv_timings(timings, adv7842_get_dv_timings_cap(sd),
                                   adv7842_check_dv_timings, NULL))
                return -ERANGE;

        adv7842_fill_optional_dv_timings_fields(sd, timings);

        state->timings = *timings;

        cp_write(sd, 0x91, bt->interlaced ? 0x40 : 0x00);

        /* Use prim_mode and vid_std when available */
        err = configure_predefined_video_timings(sd, timings);
        if (err) {
                /* custom settings when the video format
                  does not have prim_mode/vid_std */
                configure_custom_video_timings(sd, bt);
        }

        set_rgb_quantization_range(sd);


        if (debug > 1)
                v4l2_print_dv_timings(sd->name, "adv7842_s_dv_timings: ",
                                      timings, true);
        return 0;
}

static int adv7842_g_dv_timings(struct v4l2_subdev *sd,
                                struct v4l2_dv_timings *timings)
{
        struct adv7842_state *state = to_state(sd);

        if (state->mode == ADV7842_MODE_SDP)
                return -ENODATA;
        *timings = state->timings;
        return 0;
}

static void enable_input(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);

        set_rgb_quantization_range(sd);
        switch (state->mode) {
        case ADV7842_MODE_SDP:
        case ADV7842_MODE_COMP:
        case ADV7842_MODE_RGB:
                io_write(sd, 0x15, 0xb0);   /* Disable Tristate of Pins (no audio) */
                break;
        case ADV7842_MODE_HDMI:
                hdmi_write(sd, 0x01, 0x00); /* Enable HDMI clock terminators */
                io_write(sd, 0x15, 0xa0);   /* Disable Tristate of Pins */
                hdmi_write_and_or(sd, 0x1a, 0xef, 0x00); /* Unmute audio */
                break;
        default:
                v4l2_dbg(2, debug, sd, "%s: Unknown mode %d\n",
                         __func__, state->mode);
                break;
        }
}

static void disable_input(struct v4l2_subdev *sd)
{
        hdmi_write_and_or(sd, 0x1a, 0xef, 0x10); /* Mute audio [REF_01, c. 2.2.2] */
        msleep(16); /* 512 samples with >= 32 kHz sample rate [REF_03, c. 8.29] */
        io_write(sd, 0x15, 0xbe);   /* Tristate all outputs from video core */
        hdmi_write(sd, 0x01, 0x78); /* Disable HDMI clock terminators */
}

static void sdp_csc_coeff(struct v4l2_subdev *sd,
                          const struct adv7842_sdp_csc_coeff *c)
{
        /* csc auto/manual */
        sdp_io_write_and_or(sd, 0xe0, 0xbf, c->manual ? 0x00 : 0x40);

        if (!c->manual)
                return;

        /* csc scaling */
        sdp_io_write_and_or(sd, 0xe0, 0x7f, c->scaling == 2 ? 0x80 : 0x00);

        /* A coeff */
        sdp_io_write_and_or(sd, 0xe0, 0xe0, c->A1 >> 8);
        sdp_io_write(sd, 0xe1, c->A1);
        sdp_io_write_and_or(sd, 0xe2, 0xe0, c->A2 >> 8);
        sdp_io_write(sd, 0xe3, c->A2);
        sdp_io_write_and_or(sd, 0xe4, 0xe0, c->A3 >> 8);
        sdp_io_write(sd, 0xe5, c->A3);

        /* A scale */
        sdp_io_write_and_or(sd, 0xe6, 0x80, c->A4 >> 8);
        sdp_io_write(sd, 0xe7, c->A4);

        /* B coeff */
        sdp_io_write_and_or(sd, 0xe8, 0xe0, c->B1 >> 8);
        sdp_io_write(sd, 0xe9, c->B1);
        sdp_io_write_and_or(sd, 0xea, 0xe0, c->B2 >> 8);
        sdp_io_write(sd, 0xeb, c->B2);
        sdp_io_write_and_or(sd, 0xec, 0xe0, c->B3 >> 8);
        sdp_io_write(sd, 0xed, c->B3);

        /* B scale */
        sdp_io_write_and_or(sd, 0xee, 0x80, c->B4 >> 8);
        sdp_io_write(sd, 0xef, c->B4);

        /* C coeff */
        sdp_io_write_and_or(sd, 0xf0, 0xe0, c->C1 >> 8);
        sdp_io_write(sd, 0xf1, c->C1);
        sdp_io_write_and_or(sd, 0xf2, 0xe0, c->C2 >> 8);
        sdp_io_write(sd, 0xf3, c->C2);
        sdp_io_write_and_or(sd, 0xf4, 0xe0, c->C3 >> 8);
        sdp_io_write(sd, 0xf5, c->C3);

        /* C scale */
        sdp_io_write_and_or(sd, 0xf6, 0x80, c->C4 >> 8);
        sdp_io_write(sd, 0xf7, c->C4);
}

static void select_input(struct v4l2_subdev *sd,
                         enum adv7842_vid_std_select vid_std_select)
{
        struct adv7842_state *state = to_state(sd);

        switch (state->mode) {
        case ADV7842_MODE_SDP:
                io_write(sd, 0x00, vid_std_select); /* video std: CVBS or YC mode */
                io_write(sd, 0x01, 0); /* prim mode */
                /* enable embedded syncs for auto graphics mode */
                cp_write_and_or(sd, 0x81, 0xef, 0x10);

                afe_write(sd, 0x00, 0x00); /* power up ADC */
                afe_write(sd, 0xc8, 0x00); /* phase control */

                io_write(sd, 0xdd, 0x90); /* Manual 2x output clock */
                /* script says register 0xde, which don't exist in manual */

                /* Manual analog input muxing mode, CVBS (6.4)*/
                afe_write_and_or(sd, 0x02, 0x7f, 0x80);
                if (vid_std_select == ADV7842_SDP_VID_STD_CVBS_SD_4x1) {
                        afe_write(sd, 0x03, 0xa0); /* ADC0 to AIN10 (CVBS), ADC1 N/C*/
                        afe_write(sd, 0x04, 0x00); /* ADC2 N/C,ADC3 N/C*/
                } else {
                        afe_write(sd, 0x03, 0xa0); /* ADC0 to AIN10 (CVBS), ADC1 N/C*/
                        afe_write(sd, 0x04, 0xc0); /* ADC2 to AIN12, ADC3 N/C*/
                }
                afe_write(sd, 0x0c, 0x1f); /* ADI recommend write */
                afe_write(sd, 0x12, 0x63); /* ADI recommend write */

                sdp_io_write(sd, 0xb2, 0x60); /* Disable AV codes */
                sdp_io_write(sd, 0xc8, 0xe3); /* Disable Ancillary data */

                /* SDP recommended settings */
                sdp_write(sd, 0x00, 0x3F); /* Autodetect PAL NTSC (not SECAM) */
                sdp_write(sd, 0x01, 0x00); /* Pedestal Off */

                sdp_write(sd, 0x03, 0xE4); /* Manual VCR Gain Luma 0x40B */
                sdp_write(sd, 0x04, 0x0B); /* Manual Luma setting */
                sdp_write(sd, 0x05, 0xC3); /* Manual Chroma setting 0x3FE */
                sdp_write(sd, 0x06, 0xFE); /* Manual Chroma setting */
                sdp_write(sd, 0x12, 0x0D); /* Frame TBC,I_P, 3D comb enabled */
                sdp_write(sd, 0xA7, 0x00); /* ADI Recommended Write */
                sdp_io_write(sd, 0xB0, 0x00); /* Disable H and v blanking */

                /* deinterlacer enabled and 3D comb */
                sdp_write_and_or(sd, 0x12, 0xf6, 0x09);

                break;

        case ADV7842_MODE_COMP:
        case ADV7842_MODE_RGB:
                /* Automatic analog input muxing mode */
                afe_write_and_or(sd, 0x02, 0x7f, 0x00);
                /* set mode and select free run resolution */
                io_write(sd, 0x00, vid_std_select); /* video std */
                io_write(sd, 0x01, 0x02); /* prim mode */
                cp_write_and_or(sd, 0x81, 0xef, 0x10); /* enable embedded syncs
                                                          for auto graphics mode */

                afe_write(sd, 0x00, 0x00); /* power up ADC */
                afe_write(sd, 0xc8, 0x00); /* phase control */
                if (state->mode == ADV7842_MODE_COMP) {
                        /* force to YCrCb */
                        io_write_and_or(sd, 0x02, 0x0f, 0x60);
                } else {
                        /* force to RGB */
                        io_write_and_or(sd, 0x02, 0x0f, 0x10);
                }

                /* set ADI recommended settings for digitizer */
                /* "ADV7842 Register Settings Recommendations
                 * (rev. 1.8, November 2010)" p. 9. */
                afe_write(sd, 0x0c, 0x1f); /* ADC Range improvement */
                afe_write(sd, 0x12, 0x63); /* ADC Range improvement */

                /* set to default gain for RGB */
                cp_write(sd, 0x73, 0x10);
                cp_write(sd, 0x74, 0x04);
                cp_write(sd, 0x75, 0x01);
                cp_write(sd, 0x76, 0x00);

                cp_write(sd, 0x3e, 0x04); /* CP core pre-gain control */
                cp_write(sd, 0xc3, 0x39); /* CP coast control. Graphics mode */
                cp_write(sd, 0x40, 0x5c); /* CP core pre-gain control. Graphics mode */
                break;

        case ADV7842_MODE_HDMI:
                /* Automatic analog input muxing mode */
                afe_write_and_or(sd, 0x02, 0x7f, 0x00);
                /* set mode and select free run resolution */
                if (state->hdmi_port_a)
                        hdmi_write(sd, 0x00, 0x02); /* select port A */
                else
                        hdmi_write(sd, 0x00, 0x03); /* select port B */
                io_write(sd, 0x00, vid_std_select); /* video std */
                io_write(sd, 0x01, 5); /* prim mode */
                cp_write_and_or(sd, 0x81, 0xef, 0x00); /* disable embedded syncs
                                                          for auto graphics mode */

                /* set ADI recommended settings for HDMI: */
                /* "ADV7842 Register Settings Recommendations
                 * (rev. 1.8, November 2010)" p. 3. */
                hdmi_write(sd, 0xc0, 0x00);
                hdmi_write(sd, 0x0d, 0x34); /* ADI recommended write */
                hdmi_write(sd, 0x3d, 0x10); /* ADI recommended write */
                hdmi_write(sd, 0x44, 0x85); /* TMDS PLL optimization */
                hdmi_write(sd, 0x46, 0x1f); /* ADI recommended write */
                hdmi_write(sd, 0x57, 0xb6); /* TMDS PLL optimization */
                hdmi_write(sd, 0x58, 0x03); /* TMDS PLL optimization */
                hdmi_write(sd, 0x60, 0x88); /* TMDS PLL optimization */
                hdmi_write(sd, 0x61, 0x88); /* TMDS PLL optimization */
                hdmi_write(sd, 0x6c, 0x18); /* Disable ISRC clearing bit,
                                               Improve robustness */
                hdmi_write(sd, 0x75, 0x10); /* DDC drive strength */
                hdmi_write(sd, 0x85, 0x1f); /* equaliser */
                hdmi_write(sd, 0x87, 0x70); /* ADI recommended write */
                hdmi_write(sd, 0x89, 0x04); /* equaliser */
                hdmi_write(sd, 0x8a, 0x1e); /* equaliser */
                hdmi_write(sd, 0x93, 0x04); /* equaliser */
                hdmi_write(sd, 0x94, 0x1e); /* equaliser */
                hdmi_write(sd, 0x99, 0xa1); /* ADI recommended write */
                hdmi_write(sd, 0x9b, 0x09); /* ADI recommended write */
                hdmi_write(sd, 0x9d, 0x02); /* equaliser */

                afe_write(sd, 0x00, 0xff); /* power down ADC */
                afe_write(sd, 0xc8, 0x40); /* phase control */

                /* set to default gain for HDMI */
                cp_write(sd, 0x73, 0x10);
                cp_write(sd, 0x74, 0x04);
                cp_write(sd, 0x75, 0x01);
                cp_write(sd, 0x76, 0x00);

                /* reset ADI recommended settings for digitizer */
                /* "ADV7842 Register Settings Recommendations
                 * (rev. 2.5, June 2010)" p. 17. */
                afe_write(sd, 0x12, 0xfb); /* ADC noise shaping filter controls */
                afe_write(sd, 0x0c, 0x0d); /* CP core gain controls */
                cp_write(sd, 0x3e, 0x80); /* CP core pre-gain control,
                                             enable color control */
                /* CP coast control */
                cp_write(sd, 0xc3, 0x33); /* Component mode */

                /* color space conversion, autodetect color space */
                io_write_and_or(sd, 0x02, 0x0f, 0xf0);
                break;

        default:
                v4l2_dbg(2, debug, sd, "%s: Unknown mode %d\n",
                         __func__, state->mode);
                break;
        }
}

static int adv7842_s_routing(struct v4l2_subdev *sd,
                u32 input, u32 output, u32 config)
{
        struct adv7842_state *state = to_state(sd);

        v4l2_dbg(2, debug, sd, "%s: input %d\n", __func__, input);

        switch (input) {
        case ADV7842_SELECT_HDMI_PORT_A:
                state->mode = ADV7842_MODE_HDMI;
                state->vid_std_select = ADV7842_HDMI_COMP_VID_STD_HD_1250P;
                state->hdmi_port_a = true;
                break;
        case ADV7842_SELECT_HDMI_PORT_B:
                state->mode = ADV7842_MODE_HDMI;
                state->vid_std_select = ADV7842_HDMI_COMP_VID_STD_HD_1250P;
                state->hdmi_port_a = false;
                break;
        case ADV7842_SELECT_VGA_COMP:
                state->mode = ADV7842_MODE_COMP;
                state->vid_std_select = ADV7842_RGB_VID_STD_AUTO_GRAPH_MODE;
                break;
        case ADV7842_SELECT_VGA_RGB:
                state->mode = ADV7842_MODE_RGB;
                state->vid_std_select = ADV7842_RGB_VID_STD_AUTO_GRAPH_MODE;
                break;
        case ADV7842_SELECT_SDP_CVBS:
                state->mode = ADV7842_MODE_SDP;
                state->vid_std_select = ADV7842_SDP_VID_STD_CVBS_SD_4x1;
                break;
        case ADV7842_SELECT_SDP_YC:
                state->mode = ADV7842_MODE_SDP;
                state->vid_std_select = ADV7842_SDP_VID_STD_YC_SD4_x1;
                break;
        default:
                return -EINVAL;
        }

        disable_input(sd);
        select_input(sd, state->vid_std_select);
        enable_input(sd);

        v4l2_subdev_notify(sd, ADV7842_FMT_CHANGE, NULL);

        return 0;
}

static int adv7842_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned int index,
                                 enum v4l2_mbus_pixelcode *code)
{
        if (index)
                return -EINVAL;
        /* Good enough for now */
        *code = V4L2_MBUS_FMT_FIXED;
        return 0;
}

static int adv7842_g_mbus_fmt(struct v4l2_subdev *sd,
                              struct v4l2_mbus_framefmt *fmt)
{
        struct adv7842_state *state = to_state(sd);

        fmt->width = state->timings.bt.width;
        fmt->height = state->timings.bt.height;
        fmt->code = V4L2_MBUS_FMT_FIXED;
        fmt->field = V4L2_FIELD_NONE;

        if (state->mode == ADV7842_MODE_SDP) {
                /* SPD block */
                if (!(sdp_read(sd, 0x5A) & 0x01))
                        return -EINVAL;
                fmt->width = 720;
                /* valid signal */
                if (state->norm & V4L2_STD_525_60)
                        fmt->height = 480;
                else
                        fmt->height = 576;
                fmt->colorspace = V4L2_COLORSPACE_SMPTE170M;
                return 0;
        }

        if (state->timings.bt.standards & V4L2_DV_BT_STD_CEA861) {
                fmt->colorspace = (state->timings.bt.height <= 576) ?
                        V4L2_COLORSPACE_SMPTE170M : V4L2_COLORSPACE_REC709;
        }
        return 0;
}

static void adv7842_irq_enable(struct v4l2_subdev *sd, bool enable)
{
        if (enable) {
                /* Enable SSPD, STDI and CP locked/unlocked interrupts */
                io_write(sd, 0x46, 0x9c);
                /* ESDP_50HZ_DET interrupt */
                io_write(sd, 0x5a, 0x10);
                /* Enable CABLE_DET_A/B_ST (+5v) interrupt */
                io_write(sd, 0x73, 0x03);
                /* Enable V_LOCKED and DE_REGEN_LCK interrupts */
                io_write(sd, 0x78, 0x03);
                /* Enable SDP Standard Detection Change and SDP Video Detected */
                io_write(sd, 0xa0, 0x09);
                /* Enable HDMI_MODE interrupt */
                io_write(sd, 0x69, 0x08);
        } else {
                io_write(sd, 0x46, 0x0);
                io_write(sd, 0x5a, 0x0);
                io_write(sd, 0x73, 0x0);
                io_write(sd, 0x78, 0x0);
                io_write(sd, 0xa0, 0x0);
                io_write(sd, 0x69, 0x0);
        }
}

static int adv7842_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
{
        struct adv7842_state *state = to_state(sd);
        u8 fmt_change_cp, fmt_change_digital, fmt_change_sdp;
        u8 irq_status[6];

        adv7842_irq_enable(sd, false);

        /* read status */
        irq_status[0] = io_read(sd, 0x43);
        irq_status[1] = io_read(sd, 0x57);
        irq_status[2] = io_read(sd, 0x70);
        irq_status[3] = io_read(sd, 0x75);
        irq_status[4] = io_read(sd, 0x9d);
        irq_status[5] = io_read(sd, 0x66);

        /* and clear */
        if (irq_status[0])
                io_write(sd, 0x44, irq_status[0]);
        if (irq_status[1])
                io_write(sd, 0x58, irq_status[1]);
        if (irq_status[2])
                io_write(sd, 0x71, irq_status[2]);
        if (irq_status[3])
                io_write(sd, 0x76, irq_status[3]);
        if (irq_status[4])
                io_write(sd, 0x9e, irq_status[4]);
        if (irq_status[5])
                io_write(sd, 0x67, irq_status[5]);

        adv7842_irq_enable(sd, true);

        v4l2_dbg(1, debug, sd, "%s: irq %x, %x, %x, %x, %x, %x\n", __func__,
                 irq_status[0], irq_status[1], irq_status[2],
                 irq_status[3], irq_status[4], irq_status[5]);

        /* format change CP */
        fmt_change_cp = irq_status[0] & 0x9c;

        /* format change SDP */
        if (state->mode == ADV7842_MODE_SDP)
                fmt_change_sdp = (irq_status[1] & 0x30) | (irq_status[4] & 0x09);
        else
                fmt_change_sdp = 0;

        /* digital format CP */
        if (is_digital_input(sd))
                fmt_change_digital = irq_status[3] & 0x03;
        else
                fmt_change_digital = 0;

        /* format change */
        if (fmt_change_cp || fmt_change_digital || fmt_change_sdp) {
                v4l2_dbg(1, debug, sd,
                         "%s: fmt_change_cp = 0x%x, fmt_change_digital = 0x%x, fmt_change_sdp = 0x%x\n",
                         __func__, fmt_change_cp, fmt_change_digital,
                         fmt_change_sdp);
                v4l2_subdev_notify(sd, ADV7842_FMT_CHANGE, NULL);
                if (handled)
                        *handled = true;
        }

        /* HDMI/DVI mode */
        if (irq_status[5] & 0x08) {
                v4l2_dbg(1, debug, sd, "%s: irq %s mode\n", __func__,
                         (io_read(sd, 0x65) & 0x08) ? "HDMI" : "DVI");
                if (handled)
                        *handled = true;
        }

        /* tx 5v detect */
        if (irq_status[2] & 0x3) {
                v4l2_dbg(1, debug, sd, "%s: irq tx_5v\n", __func__);
                adv7842_s_detect_tx_5v_ctrl(sd);
                if (handled)
                        *handled = true;
        }
        return 0;
}

static int adv7842_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
{
        struct adv7842_state *state = to_state(sd);
        u8 *data = NULL;

        if (edid->pad > ADV7842_EDID_PORT_VGA)
                return -EINVAL;
        if (edid->blocks == 0)
                return -EINVAL;
        if (edid->blocks > 2)
                return -EINVAL;
        if (edid->start_block > 1)
                return -EINVAL;
        if (edid->start_block == 1)
                edid->blocks = 1;
        if (!edid->edid)
                return -EINVAL;

        switch (edid->pad) {
        case ADV7842_EDID_PORT_A:
        case ADV7842_EDID_PORT_B:
                if (state->hdmi_edid.present & (0x04 << edid->pad))
                        data = state->hdmi_edid.edid;
                break;
        case ADV7842_EDID_PORT_VGA:
                if (state->vga_edid.present)
                        data = state->vga_edid.edid;
                break;
        default:
                return -EINVAL;
        }
        if (!data)
                return -ENODATA;

        memcpy(edid->edid,
               data + edid->start_block * 128,
               edid->blocks * 128);
        return 0;
}

static int adv7842_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *e)
{
        struct adv7842_state *state = to_state(sd);
        int err = 0;

        if (e->pad > ADV7842_EDID_PORT_VGA)
                return -EINVAL;
        if (e->start_block != 0)
                return -EINVAL;
        if (e->blocks > 2)
                return -E2BIG;
        if (!e->edid)
                return -EINVAL;

        /* todo, per edid */
        state->aspect_ratio = v4l2_calc_aspect_ratio(e->edid[0x15],
                        e->edid[0x16]);

        switch (e->pad) {
        case ADV7842_EDID_PORT_VGA:
                memset(&state->vga_edid.edid, 0, 256);
                state->vga_edid.present = e->blocks ? 0x1 : 0x0;
                memcpy(&state->vga_edid.edid, e->edid, 128 * e->blocks);
                err = edid_write_vga_segment(sd);
                break;
        case ADV7842_EDID_PORT_A:
        case ADV7842_EDID_PORT_B:
                memset(&state->hdmi_edid.edid, 0, 256);
                if (e->blocks)
                        state->hdmi_edid.present |= 0x04 << e->pad;
                else
                        state->hdmi_edid.present &= ~(0x04 << e->pad);

                memcpy(&state->hdmi_edid.edid, e->edid, 128 * e->blocks);
                err = edid_write_hdmi_segment(sd, e->pad);
                break;
        default:
                return -EINVAL;
        }
        if (err < 0)
                v4l2_err(sd, "error %d writing edid on port %d\n", err, e->pad);
        return err;
}

/*********** avi info frame CEA-861-E **************/
/* TODO move to common library */

struct avi_info_frame {
        uint8_t f17;
        uint8_t y10;
        uint8_t a0;
        uint8_t b10;
        uint8_t s10;
        uint8_t c10;
        uint8_t m10;
        uint8_t r3210;
        uint8_t itc;
        uint8_t ec210;
        uint8_t q10;
        uint8_t sc10;
        uint8_t f47;
        uint8_t vic;
        uint8_t yq10;
        uint8_t cn10;
        uint8_t pr3210;
        uint16_t etb;
        uint16_t sbb;
        uint16_t elb;
        uint16_t srb;
};

static const char *y10_txt[4] = {
        "RGB",
        "YCbCr 4:2:2",
        "YCbCr 4:4:4",
        "Future",
};

static const char *c10_txt[4] = {
        "No Data",
        "SMPTE 170M",
        "ITU-R 709",
        "Extended Colorimetry information valied",
};

static const char *itc_txt[2] = {
        "No Data",
        "IT content",
};

static const char *ec210_txt[8] = {
        "xvYCC601",
        "xvYCC709",
        "sYCC601",
        "AdobeYCC601",
        "AdobeRGB",
        "5 reserved",
        "6 reserved",
        "7 reserved",
};

static const char *q10_txt[4] = {
        "Default",
        "Limited Range",
        "Full Range",
        "Reserved",
};

static void parse_avi_infoframe(struct v4l2_subdev *sd, uint8_t *buf,
                                struct avi_info_frame *avi)
{
        avi->f17 = (buf[1] >> 7) & 0x1;
        avi->y10 = (buf[1] >> 5) & 0x3;
        avi->a0 = (buf[1] >> 4) & 0x1;
        avi->b10 = (buf[1] >> 2) & 0x3;
        avi->s10 = buf[1] & 0x3;
        avi->c10 = (buf[2] >> 6) & 0x3;
        avi->m10 = (buf[2] >> 4) & 0x3;
        avi->r3210 = buf[2] & 0xf;
        avi->itc = (buf[3] >> 7) & 0x1;
        avi->ec210 = (buf[3] >> 4) & 0x7;
        avi->q10 = (buf[3] >> 2) & 0x3;
        avi->sc10 = buf[3] & 0x3;
        avi->f47 = (buf[4] >> 7) & 0x1;
        avi->vic = buf[4] & 0x7f;
        avi->yq10 = (buf[5] >> 6) & 0x3;
        avi->cn10 = (buf[5] >> 4) & 0x3;
        avi->pr3210 = buf[5] & 0xf;
        avi->etb = buf[6] + 256*buf[7];
        avi->sbb = buf[8] + 256*buf[9];
        avi->elb = buf[10] + 256*buf[11];
        avi->srb = buf[12] + 256*buf[13];
}

static void print_avi_infoframe(struct v4l2_subdev *sd)
{
        int i;
        uint8_t buf[14];
        uint8_t avi_inf_len;
        struct avi_info_frame avi;

        if (!(hdmi_read(sd, 0x05) & 0x80)) {
                v4l2_info(sd, "receive DVI-D signal (AVI infoframe not supported)\n");
                return;
        }
        if (!(io_read(sd, 0x60) & 0x01)) {
                v4l2_info(sd, "AVI infoframe not received\n");
                return;
        }

        if (io_read(sd, 0x88) & 0x10) {
                /* Note: the ADV7842 calculated incorrect checksums for InfoFrames
                   with a length of 14 or 15. See the ADV7842 Register Settings
                   Recommendations document for more details. */
                v4l2_info(sd, "AVI infoframe checksum error\n");
                return;
        }

        avi_inf_len = infoframe_read(sd, 0xe2);
        v4l2_info(sd, "AVI infoframe version %d (%d byte)\n",
                  infoframe_read(sd, 0xe1), avi_inf_len);

        if (infoframe_read(sd, 0xe1) != 0x02)
                return;

        for (i = 0; i < 14; i++)
                buf[i] = infoframe_read(sd, i);

        v4l2_info(sd, "\t%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
                  buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],
                  buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);

        parse_avi_infoframe(sd, buf, &avi);

        if (avi.vic)
                v4l2_info(sd, "\tVIC: %d\n", avi.vic);
        if (avi.itc)
                v4l2_info(sd, "\t%s\n", itc_txt[avi.itc]);

        if (avi.y10)
                v4l2_info(sd, "\t%s %s\n", y10_txt[avi.y10], !avi.c10 ? "" :
                        (avi.c10 == 0x3 ? ec210_txt[avi.ec210] : c10_txt[avi.c10]));
        else
                v4l2_info(sd, "\t%s %s\n", y10_txt[avi.y10], q10_txt[avi.q10]);
}

static const char * const prim_mode_txt[] = {
        "SDP",
        "Component",
        "Graphics",
        "Reserved",
        "CVBS & HDMI AUDIO",
        "HDMI-Comp",
        "HDMI-GR",
        "Reserved",
        "Reserved",
        "Reserved",
        "Reserved",
        "Reserved",
        "Reserved",
        "Reserved",
        "Reserved",
        "Reserved",
};

static int adv7842_sdp_log_status(struct v4l2_subdev *sd)
{
        /* SDP (Standard definition processor) block */
        uint8_t sdp_signal_detected = sdp_read(sd, 0x5A) & 0x01;

        v4l2_info(sd, "Chip powered %s\n", no_power(sd) ? "off" : "on");
        v4l2_info(sd, "Prim-mode = 0x%x, video std = 0x%x\n",
                  io_read(sd, 0x01) & 0x0f, io_read(sd, 0x00) & 0x3f);

        v4l2_info(sd, "SDP: free run: %s\n",
                (sdp_read(sd, 0x56) & 0x01) ? "on" : "off");
        v4l2_info(sd, "SDP: %s\n", sdp_signal_detected ?
                "valid SD/PR signal detected" : "invalid/no signal");
        if (sdp_signal_detected) {
                static const char * const sdp_std_txt[] = {
                        "NTSC-M/J",
                        "1?",
                        "NTSC-443",
                        "60HzSECAM",
                        "PAL-M",
                        "5?",
                        "PAL-60",
                        "7?", "8?", "9?", "a?", "b?",
                        "PAL-CombN",
                        "d?",
                        "PAL-BGHID",
                        "SECAM"
                };
                v4l2_info(sd, "SDP: standard %s\n",
                        sdp_std_txt[sdp_read(sd, 0x52) & 0x0f]);
                v4l2_info(sd, "SDP: %s\n",
                        (sdp_read(sd, 0x59) & 0x08) ? "50Hz" : "60Hz");
                v4l2_info(sd, "SDP: %s\n",
                        (sdp_read(sd, 0x57) & 0x08) ? "Interlaced" : "Progressive");
                v4l2_info(sd, "SDP: deinterlacer %s\n",
                        (sdp_read(sd, 0x12) & 0x08) ? "enabled" : "disabled");
                v4l2_info(sd, "SDP: csc %s mode\n",
                        (sdp_io_read(sd, 0xe0) & 0x40) ? "auto" : "manual");
        }
        return 0;
}

static int adv7842_cp_log_status(struct v4l2_subdev *sd)
{
        /* CP block */
        struct adv7842_state *state = to_state(sd);
        struct v4l2_dv_timings timings;
        uint8_t reg_io_0x02 = io_read(sd, 0x02);
        uint8_t reg_io_0x21 = io_read(sd, 0x21);
        uint8_t reg_rep_0x77 = rep_read(sd, 0x77);
        uint8_t reg_rep_0x7d = rep_read(sd, 0x7d);
        bool audio_pll_locked = hdmi_read(sd, 0x04) & 0x01;
        bool audio_sample_packet_detect = hdmi_read(sd, 0x18) & 0x01;
        bool audio_mute = io_read(sd, 0x65) & 0x40;

        static const char * const csc_coeff_sel_rb[16] = {
                "bypassed", "YPbPr601 -> RGB", "reserved", "YPbPr709 -> RGB",
                "reserved", "RGB -> YPbPr601", "reserved", "RGB -> YPbPr709",
                "reserved", "YPbPr709 -> YPbPr601", "YPbPr601 -> YPbPr709",
                "reserved", "reserved", "reserved", "reserved", "manual"
        };
        static const char * const input_color_space_txt[16] = {
                "RGB limited range (16-235)", "RGB full range (0-255)",
                "YCbCr Bt.601 (16-235)", "YCbCr Bt.709 (16-235)",
                "xvYCC Bt.601", "xvYCC Bt.709",
                "YCbCr Bt.601 (0-255)", "YCbCr Bt.709 (0-255)",
                "invalid", "invalid", "invalid", "invalid", "invalid",
                "invalid", "invalid", "automatic"
        };
        static const char * const rgb_quantization_range_txt[] = {
                "Automatic",
                "RGB limited range (16-235)",
                "RGB full range (0-255)",
        };
        static const char * const deep_color_mode_txt[4] = {
                "8-bits per channel",
                "10-bits per channel",
                "12-bits per channel",
                "16-bits per channel (not supported)"
        };

        v4l2_info(sd, "-----Chip status-----\n");
        v4l2_info(sd, "Chip power: %s\n", no_power(sd) ? "off" : "on");
        v4l2_info(sd, "HDMI/DVI-D port selected: %s\n",
                        state->hdmi_port_a ? "A" : "B");
        v4l2_info(sd, "EDID A %s, B %s\n",
                  ((reg_rep_0x7d & 0x04) && (reg_rep_0x77 & 0x04)) ?
                  "enabled" : "disabled",
                  ((reg_rep_0x7d & 0x08) && (reg_rep_0x77 & 0x08)) ?
                  "enabled" : "disabled");
        v4l2_info(sd, "HPD A %s, B %s\n",
                  reg_io_0x21 & 0x02 ? "enabled" : "disabled",
                  reg_io_0x21 & 0x01 ? "enabled" : "disabled");
        v4l2_info(sd, "CEC %s\n", !!(cec_read(sd, 0x2a) & 0x01) ?
                        "enabled" : "disabled");

        v4l2_info(sd, "-----Signal status-----\n");
        if (state->hdmi_port_a) {
                v4l2_info(sd, "Cable detected (+5V power): %s\n",
                          io_read(sd, 0x6f) & 0x02 ? "true" : "false");
                v4l2_info(sd, "TMDS signal detected: %s\n",
                          (io_read(sd, 0x6a) & 0x02) ? "true" : "false");
                v4l2_info(sd, "TMDS signal locked: %s\n",
                          (io_read(sd, 0x6a) & 0x20) ? "true" : "false");
        } else {
                v4l2_info(sd, "Cable detected (+5V power):%s\n",
                          io_read(sd, 0x6f) & 0x01 ? "true" : "false");
                v4l2_info(sd, "TMDS signal detected: %s\n",
                          (io_read(sd, 0x6a) & 0x01) ? "true" : "false");
                v4l2_info(sd, "TMDS signal locked: %s\n",
                          (io_read(sd, 0x6a) & 0x10) ? "true" : "false");
        }
        v4l2_info(sd, "CP free run: %s\n",
                  (!!(cp_read(sd, 0xff) & 0x10) ? "on" : "off"));
        v4l2_info(sd, "Prim-mode = 0x%x, video std = 0x%x, v_freq = 0x%x\n",
                  io_read(sd, 0x01) & 0x0f, io_read(sd, 0x00) & 0x3f,
                  (io_read(sd, 0x01) & 0x70) >> 4);

        v4l2_info(sd, "-----Video Timings-----\n");
        if (no_cp_signal(sd)) {
                v4l2_info(sd, "STDI: not locked\n");
        } else {
                uint32_t bl = ((cp_read(sd, 0xb1) & 0x3f) << 8) | cp_read(sd, 0xb2);
                uint32_t lcf = ((cp_read(sd, 0xb3) & 0x7) << 8) | cp_read(sd, 0xb4);
                uint32_t lcvs = cp_read(sd, 0xb3) >> 3;
                uint32_t fcl = ((cp_read(sd, 0xb8) & 0x1f) << 8) | cp_read(sd, 0xb9);
                char hs_pol = ((cp_read(sd, 0xb5) & 0x10) ?
                                ((cp_read(sd, 0xb5) & 0x08) ? '+' : '-') : 'x');
                char vs_pol = ((cp_read(sd, 0xb5) & 0x40) ?
                                ((cp_read(sd, 0xb5) & 0x20) ? '+' : '-') : 'x');
                v4l2_info(sd,
                        "STDI: lcf (frame height - 1) = %d, bl = %d, lcvs (vsync) = %d, fcl = %d, %s, %chsync, %cvsync\n",
                        lcf, bl, lcvs, fcl,
                        (cp_read(sd, 0xb1) & 0x40) ?
                                "interlaced" : "progressive",
                        hs_pol, vs_pol);
        }
        if (adv7842_query_dv_timings(sd, &timings))
                v4l2_info(sd, "No video detected\n");
        else
                v4l2_print_dv_timings(sd->name, "Detected format: ",
                                      &timings, true);
        v4l2_print_dv_timings(sd->name, "Configured format: ",
                        &state->timings, true);

        if (no_cp_signal(sd))
                return 0;

        v4l2_info(sd, "-----Color space-----\n");
        v4l2_info(sd, "RGB quantization range ctrl: %s\n",
                  rgb_quantization_range_txt[state->rgb_quantization_range]);
        v4l2_info(sd, "Input color space: %s\n",
                  input_color_space_txt[reg_io_0x02 >> 4]);
        v4l2_info(sd, "Output color space: %s %s, saturator %s\n",
                  (reg_io_0x02 & 0x02) ? "RGB" : "YCbCr",
                  (reg_io_0x02 & 0x04) ? "(16-235)" : "(0-255)",
                  ((reg_io_0x02 & 0x04) ^ (reg_io_0x02 & 0x01)) ?
                                        "enabled" : "disabled");
        v4l2_info(sd, "Color space conversion: %s\n",
                  csc_coeff_sel_rb[cp_read(sd, 0xf4) >> 4]);

        if (!is_digital_input(sd))
                return 0;

        v4l2_info(sd, "-----%s status-----\n", is_hdmi(sd) ? "HDMI" : "DVI-D");
        v4l2_info(sd, "HDCP encrypted content: %s\n",
                        (hdmi_read(sd, 0x05) & 0x40) ? "true" : "false");
        v4l2_info(sd, "HDCP keys read: %s%s\n",
                        (hdmi_read(sd, 0x04) & 0x20) ? "yes" : "no",
                        (hdmi_read(sd, 0x04) & 0x10) ? "ERROR" : "");
        if (!is_hdmi(sd))
                return 0;

        v4l2_info(sd, "Audio: pll %s, samples %s, %s\n",
                        audio_pll_locked ? "locked" : "not locked",
                        audio_sample_packet_detect ? "detected" : "not detected",
                        audio_mute ? "muted" : "enabled");
        if (audio_pll_locked && audio_sample_packet_detect) {
                v4l2_info(sd, "Audio format: %s\n",
                        (hdmi_read(sd, 0x07) & 0x40) ? "multi-channel" : "stereo");
        }
        v4l2_info(sd, "Audio CTS: %u\n", (hdmi_read(sd, 0x5b) << 12) +
                        (hdmi_read(sd, 0x5c) << 8) +
                        (hdmi_read(sd, 0x5d) & 0xf0));
        v4l2_info(sd, "Audio N: %u\n", ((hdmi_read(sd, 0x5d) & 0x0f) << 16) +
                        (hdmi_read(sd, 0x5e) << 8) +
                        hdmi_read(sd, 0x5f));
        v4l2_info(sd, "AV Mute: %s\n",
                        (hdmi_read(sd, 0x04) & 0x40) ? "on" : "off");
        v4l2_info(sd, "Deep color mode: %s\n",
                        deep_color_mode_txt[hdmi_read(sd, 0x0b) >> 6]);

        print_avi_infoframe(sd);
        return 0;
}

static int adv7842_log_status(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);

        if (state->mode == ADV7842_MODE_SDP)
                return adv7842_sdp_log_status(sd);
        return adv7842_cp_log_status(sd);
}

static int adv7842_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
{
        struct adv7842_state *state = to_state(sd);

        v4l2_dbg(1, debug, sd, "%s:\n", __func__);

        if (state->mode != ADV7842_MODE_SDP)
                return -ENODATA;

        if (!(sdp_read(sd, 0x5A) & 0x01)) {
                *std = 0;
                v4l2_dbg(1, debug, sd, "%s: no valid signal\n", __func__);
                return 0;
        }

        switch (sdp_read(sd, 0x52) & 0x0f) {
        case 0:
                /* NTSC-M/J */
                *std &= V4L2_STD_NTSC;
                break;
        case 2:
                /* NTSC-443 */
                *std &= V4L2_STD_NTSC_443;
                break;
        case 3:
                /* 60HzSECAM */
                *std &= V4L2_STD_SECAM;
                break;
        case 4:
                /* PAL-M */
                *std &= V4L2_STD_PAL_M;
                break;
        case 6:
                /* PAL-60 */
                *std &= V4L2_STD_PAL_60;
                break;
        case 0xc:
                /* PAL-CombN */
                *std &= V4L2_STD_PAL_Nc;
                break;
        case 0xe:
                /* PAL-BGHID */
                *std &= V4L2_STD_PAL;
                break;
        case 0xf:
                /* SECAM */
                *std &= V4L2_STD_SECAM;
                break;
        default:
                *std &= V4L2_STD_ALL;
                break;
        }
        return 0;
}

static void adv7842_s_sdp_io(struct v4l2_subdev *sd, struct adv7842_sdp_io_sync_adjustment *s)
{
        if (s && s->adjust) {
                sdp_io_write(sd, 0x94, (s->hs_beg >> 8) & 0xf);
                sdp_io_write(sd, 0x95, s->hs_beg & 0xff);
                sdp_io_write(sd, 0x96, (s->hs_width >> 8) & 0xf);
                sdp_io_write(sd, 0x97, s->hs_width & 0xff);
                sdp_io_write(sd, 0x98, (s->de_beg >> 8) & 0xf);
                sdp_io_write(sd, 0x99, s->de_beg & 0xff);
                sdp_io_write(sd, 0x9a, (s->de_end >> 8) & 0xf);
                sdp_io_write(sd, 0x9b, s->de_end & 0xff);
                sdp_io_write(sd, 0xa8, s->vs_beg_o);
                sdp_io_write(sd, 0xa9, s->vs_beg_e);
                sdp_io_write(sd, 0xaa, s->vs_end_o);
                sdp_io_write(sd, 0xab, s->vs_end_e);
                sdp_io_write(sd, 0xac, s->de_v_beg_o);
                sdp_io_write(sd, 0xad, s->de_v_beg_e);
                sdp_io_write(sd, 0xae, s->de_v_end_o);
                sdp_io_write(sd, 0xaf, s->de_v_end_e);
        } else {
                /* set to default */
                sdp_io_write(sd, 0x94, 0x00);
                sdp_io_write(sd, 0x95, 0x00);
                sdp_io_write(sd, 0x96, 0x00);
                sdp_io_write(sd, 0x97, 0x20);
                sdp_io_write(sd, 0x98, 0x00);
                sdp_io_write(sd, 0x99, 0x00);
                sdp_io_write(sd, 0x9a, 0x00);
                sdp_io_write(sd, 0x9b, 0x00);
                sdp_io_write(sd, 0xa8, 0x04);
                sdp_io_write(sd, 0xa9, 0x04);
                sdp_io_write(sd, 0xaa, 0x04);
                sdp_io_write(sd, 0xab, 0x04);
                sdp_io_write(sd, 0xac, 0x04);
                sdp_io_write(sd, 0xad, 0x04);
                sdp_io_write(sd, 0xae, 0x04);
                sdp_io_write(sd, 0xaf, 0x04);
        }
}

static int adv7842_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
{
        struct adv7842_state *state = to_state(sd);
        struct adv7842_platform_data *pdata = &state->pdata;

        v4l2_dbg(1, debug, sd, "%s:\n", __func__);

        if (state->mode != ADV7842_MODE_SDP)
                return -ENODATA;

        if (norm & V4L2_STD_625_50)
                adv7842_s_sdp_io(sd, &pdata->sdp_io_sync_625);
        else if (norm & V4L2_STD_525_60)
                adv7842_s_sdp_io(sd, &pdata->sdp_io_sync_525);
        else
                adv7842_s_sdp_io(sd, NULL);

        if (norm & V4L2_STD_ALL) {
                state->norm = norm;
                return 0;
        }
        return -EINVAL;
}

static int adv7842_g_std(struct v4l2_subdev *sd, v4l2_std_id *norm)
{
        struct adv7842_state *state = to_state(sd);

        v4l2_dbg(1, debug, sd, "%s:\n", __func__);

        if (state->mode != ADV7842_MODE_SDP)
                return -ENODATA;

        *norm = state->norm;
        return 0;
}

/* ----------------------------------------------------------------------- */

static int adv7842_core_init(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);
        struct adv7842_platform_data *pdata = &state->pdata;
        hdmi_write(sd, 0x48,
                   (pdata->disable_pwrdnb ? 0x80 : 0) |
                   (pdata->disable_cable_det_rst ? 0x40 : 0));

        disable_input(sd);

        /* power */
        io_write(sd, 0x0c, 0x42);   /* Power up part and power down VDP */
        io_write(sd, 0x15, 0x80);   /* Power up pads */

        /* video format */
        io_write(sd, 0x02,
                 0xf0 |
                 pdata->alt_gamma << 3 |
                 pdata->op_656_range << 2 |
                 pdata->rgb_out << 1 |
                 pdata->alt_data_sat << 0);
        io_write(sd, 0x03, pdata->op_format_sel);
        io_write_and_or(sd, 0x04, 0x1f, pdata->op_ch_sel << 5);
        io_write_and_or(sd, 0x05, 0xf0, pdata->blank_data << 3 |
                        pdata->insert_av_codes << 2 |
                        pdata->replicate_av_codes << 1 |
                        pdata->invert_cbcr << 0);

        /* HDMI audio */
        hdmi_write_and_or(sd, 0x1a, 0xf1, 0x08); /* Wait 1 s before unmute */

        /* Drive strength */
        io_write_and_or(sd, 0x14, 0xc0,
                        pdata->dr_str_data << 4 |
                        pdata->dr_str_clk << 2 |
                        pdata->dr_str_sync);

        /* HDMI free run */
        cp_write_and_or(sd, 0xba, 0xfc, pdata->hdmi_free_run_enable |
                                        (pdata->hdmi_free_run_mode << 1));

        /* SPD free run */
        sdp_write_and_or(sd, 0xdd, 0xf0, pdata->sdp_free_run_force |
                                         (pdata->sdp_free_run_cbar_en << 1) |
                                         (pdata->sdp_free_run_man_col_en << 2) |
                                         (pdata->sdp_free_run_auto << 3));

        /* TODO from platform data */
        cp_write(sd, 0x69, 0x14);   /* Enable CP CSC */
        io_write(sd, 0x06, 0xa6);   /* positive VS and HS and DE */
        cp_write(sd, 0xf3, 0xdc); /* Low threshold to enter/exit free run mode */
        afe_write(sd, 0xb5, 0x01);  /* Setting MCLK to 256Fs */

        afe_write(sd, 0x02, pdata->ain_sel); /* Select analog input muxing mode */
        io_write_and_or(sd, 0x30, ~(1 << 4), pdata->output_bus_lsb_to_msb << 4);

        sdp_csc_coeff(sd, &pdata->sdp_csc_coeff);

        /* todo, improve settings for sdram */
        if (pdata->sd_ram_size >= 128) {
                sdp_write(sd, 0x12, 0x0d); /* Frame TBC,3D comb enabled */
                if (pdata->sd_ram_ddr) {
                        /* SDP setup for the AD eval board */
                        sdp_io_write(sd, 0x6f, 0x00); /* DDR mode */
                        sdp_io_write(sd, 0x75, 0x0a); /* 128 MB memory size */
                        sdp_io_write(sd, 0x7a, 0xa5); /* Timing Adjustment */
                        sdp_io_write(sd, 0x7b, 0x8f); /* Timing Adjustment */
                        sdp_io_write(sd, 0x60, 0x01); /* SDRAM reset */
                } else {
                        sdp_io_write(sd, 0x75, 0x0a); /* 64 MB memory size ?*/
                        sdp_io_write(sd, 0x74, 0x00); /* must be zero for sdr sdram */
                        sdp_io_write(sd, 0x79, 0x33); /* CAS latency to 3,
                                                         depends on memory */
                        sdp_io_write(sd, 0x6f, 0x01); /* SDR mode */
                        sdp_io_write(sd, 0x7a, 0xa5); /* Timing Adjustment */
                        sdp_io_write(sd, 0x7b, 0x8f); /* Timing Adjustment */
                        sdp_io_write(sd, 0x60, 0x01); /* SDRAM reset */
                }
        } else {
                /*
                 * Manual UG-214, rev 0 is bit confusing on this bit
                 * but a '1' disables any signal if the Ram is active.
                 */
                sdp_io_write(sd, 0x29, 0x10); /* Tristate memory interface */
        }

        select_input(sd, pdata->vid_std_select);

        enable_input(sd);

        /* disable I2C access to internal EDID ram from HDMI DDC ports */
        rep_write_and_or(sd, 0x77, 0xf3, 0x00);

        hdmi_write(sd, 0x69, 0xa3); /* HPA manual */
        /* HPA disable on port A and B */
        io_write_and_or(sd, 0x20, 0xcf, 0x00);

        /* LLC */
        io_write(sd, 0x19, 0x80 | pdata->llc_dll_phase);
        io_write(sd, 0x33, 0x40);

        /* interrupts */
        io_write(sd, 0x40, 0xf2); /* Configure INT1 */

        adv7842_irq_enable(sd, true);

        return v4l2_ctrl_handler_setup(sd->ctrl_handler);
}

/* ----------------------------------------------------------------------- */

static int adv7842_ddr_ram_test(struct v4l2_subdev *sd)
{
        /*
         * From ADV784x external Memory test.pdf
         *
         * Reset must just been performed before running test.
         * Recommended to reset after test.
         */
        int i;
        int pass = 0;
        int fail = 0;
        int complete = 0;

        io_write(sd, 0x00, 0x01);  /* Program SDP 4x1 */
        io_write(sd, 0x01, 0x00);  /* Program SDP mode */
        afe_write(sd, 0x80, 0x92); /* SDP Recommeneded Write */
        afe_write(sd, 0x9B, 0x01); /* SDP Recommeneded Write ADV7844ES1 */
        afe_write(sd, 0x9C, 0x60); /* SDP Recommeneded Write ADV7844ES1 */
        afe_write(sd, 0x9E, 0x02); /* SDP Recommeneded Write ADV7844ES1 */
        afe_write(sd, 0xA0, 0x0B); /* SDP Recommeneded Write ADV7844ES1 */
        afe_write(sd, 0xC3, 0x02); /* Memory BIST Initialisation */
        io_write(sd, 0x0C, 0x40);  /* Power up ADV7844 */
        io_write(sd, 0x15, 0xBA);  /* Enable outputs */
        sdp_write(sd, 0x12, 0x00); /* Disable 3D comb, Frame TBC & 3DNR */
        io_write(sd, 0xFF, 0x04);  /* Reset memory controller */

        mdelay(5);

        sdp_write(sd, 0x12, 0x00);    /* Disable 3D Comb, Frame TBC & 3DNR */
        sdp_io_write(sd, 0x2A, 0x01); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x7c, 0x19); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x80, 0x87); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x81, 0x4a); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x82, 0x2c); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x83, 0x0e); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x84, 0x94); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x85, 0x62); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x7d, 0x00); /* Memory BIST Initialisation */
        sdp_io_write(sd, 0x7e, 0x1a); /* Memory BIST Initialisation */

        mdelay(5);

        sdp_io_write(sd, 0xd9, 0xd5); /* Enable BIST Test */
        sdp_write(sd, 0x12, 0x05); /* Enable FRAME TBC & 3D COMB */

        mdelay(20);

        for (i = 0; i < 10; i++) {
                u8 result = sdp_io_read(sd, 0xdb);
                if (result & 0x10) {
                        complete++;
                        if (result & 0x20)
                                fail++;
                        else
                                pass++;
                }
                mdelay(20);
        }

        v4l2_dbg(1, debug, sd,
                "Ram Test: completed %d of %d: pass %d, fail %d\n",
                complete, i, pass, fail);

        if (!complete || fail)
                return -EIO;
        return 0;
}

static void adv7842_rewrite_i2c_addresses(struct v4l2_subdev *sd,
                struct adv7842_platform_data *pdata)
{
        io_write(sd, 0xf1, pdata->i2c_sdp << 1);
        io_write(sd, 0xf2, pdata->i2c_sdp_io << 1);
        io_write(sd, 0xf3, pdata->i2c_avlink << 1);
        io_write(sd, 0xf4, pdata->i2c_cec << 1);
        io_write(sd, 0xf5, pdata->i2c_infoframe << 1);

        io_write(sd, 0xf8, pdata->i2c_afe << 1);
        io_write(sd, 0xf9, pdata->i2c_repeater << 1);
        io_write(sd, 0xfa, pdata->i2c_edid << 1);
        io_write(sd, 0xfb, pdata->i2c_hdmi << 1);

        io_write(sd, 0xfd, pdata->i2c_cp << 1);
        io_write(sd, 0xfe, pdata->i2c_vdp << 1);
}

static int adv7842_command_ram_test(struct v4l2_subdev *sd)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct adv7842_state *state = to_state(sd);
        struct adv7842_platform_data *pdata = client->dev.platform_data;
        struct v4l2_dv_timings timings;
        int ret = 0;

        if (!pdata)
                return -ENODEV;

        if (!pdata->sd_ram_size || !pdata->sd_ram_ddr) {
                v4l2_info(sd, "no sdram or no ddr sdram\n");
                return -EINVAL;
        }

        main_reset(sd);

        adv7842_rewrite_i2c_addresses(sd, pdata);

        /* run ram test */
        ret = adv7842_ddr_ram_test(sd);

        main_reset(sd);

        adv7842_rewrite_i2c_addresses(sd, pdata);

        /* and re-init chip and state */
        adv7842_core_init(sd);

        disable_input(sd);

        select_input(sd, state->vid_std_select);

        enable_input(sd);

        edid_write_vga_segment(sd);
        edid_write_hdmi_segment(sd, ADV7842_EDID_PORT_A);
        edid_write_hdmi_segment(sd, ADV7842_EDID_PORT_B);

        timings = state->timings;

        memset(&state->timings, 0, sizeof(struct v4l2_dv_timings));

        adv7842_s_dv_timings(sd, &timings);

        return ret;
}

static long adv7842_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
        switch (cmd) {
        case ADV7842_CMD_RAM_TEST:
                return adv7842_command_ram_test(sd);
        }
        return -ENOTTY;
}

/* ----------------------------------------------------------------------- */

static const struct v4l2_ctrl_ops adv7842_ctrl_ops = {
        .s_ctrl = adv7842_s_ctrl,
};

static const struct v4l2_subdev_core_ops adv7842_core_ops = {
        .log_status = adv7842_log_status,
        .g_std = adv7842_g_std,
        .s_std = adv7842_s_std,
        .ioctl = adv7842_ioctl,
        .interrupt_service_routine = adv7842_isr,
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .g_register = adv7842_g_register,
        .s_register = adv7842_s_register,
#endif
};

static const struct v4l2_subdev_video_ops adv7842_video_ops = {
        .s_routing = adv7842_s_routing,
        .querystd = adv7842_querystd,
        .g_input_status = adv7842_g_input_status,
        .s_dv_timings = adv7842_s_dv_timings,
        .g_dv_timings = adv7842_g_dv_timings,
        .query_dv_timings = adv7842_query_dv_timings,
        .enum_dv_timings = adv7842_enum_dv_timings,
        .dv_timings_cap = adv7842_dv_timings_cap,
        .enum_mbus_fmt = adv7842_enum_mbus_fmt,
        .g_mbus_fmt = adv7842_g_mbus_fmt,
        .try_mbus_fmt = adv7842_g_mbus_fmt,
        .s_mbus_fmt = adv7842_g_mbus_fmt,
};

static const struct v4l2_subdev_pad_ops adv7842_pad_ops = {
        .get_edid = adv7842_get_edid,
        .set_edid = adv7842_set_edid,
};

static const struct v4l2_subdev_ops adv7842_ops = {
        .core = &adv7842_core_ops,
        .video = &adv7842_video_ops,
        .pad = &adv7842_pad_ops,
};

/* -------------------------- custom ctrls ---------------------------------- */

static const struct v4l2_ctrl_config adv7842_ctrl_analog_sampling_phase = {
        .ops = &adv7842_ctrl_ops,
        .id = V4L2_CID_ADV_RX_ANALOG_SAMPLING_PHASE,
        .name = "Analog Sampling Phase",
        .type = V4L2_CTRL_TYPE_INTEGER,
        .min = 0,
        .max = 0x1f,
        .step = 1,
        .def = 0,
};

static const struct v4l2_ctrl_config adv7842_ctrl_free_run_color_manual = {
        .ops = &adv7842_ctrl_ops,
        .id = V4L2_CID_ADV_RX_FREE_RUN_COLOR_MANUAL,
        .name = "Free Running Color, Manual",
        .type = V4L2_CTRL_TYPE_BOOLEAN,
        .max = 1,
        .step = 1,
        .def = 1,
};

static const struct v4l2_ctrl_config adv7842_ctrl_free_run_color = {
        .ops = &adv7842_ctrl_ops,
        .id = V4L2_CID_ADV_RX_FREE_RUN_COLOR,
        .name = "Free Running Color",
        .type = V4L2_CTRL_TYPE_INTEGER,
        .max = 0xffffff,
        .step = 0x1,
};


static void adv7842_unregister_clients(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);
        if (state->i2c_avlink)
                i2c_unregister_device(state->i2c_avlink);
        if (state->i2c_cec)
                i2c_unregister_device(state->i2c_cec);
        if (state->i2c_infoframe)
                i2c_unregister_device(state->i2c_infoframe);
        if (state->i2c_sdp_io)
                i2c_unregister_device(state->i2c_sdp_io);
        if (state->i2c_sdp)
                i2c_unregister_device(state->i2c_sdp);
        if (state->i2c_afe)
                i2c_unregister_device(state->i2c_afe);
        if (state->i2c_repeater)
                i2c_unregister_device(state->i2c_repeater);
        if (state->i2c_edid)
                i2c_unregister_device(state->i2c_edid);
        if (state->i2c_hdmi)
                i2c_unregister_device(state->i2c_hdmi);
        if (state->i2c_cp)
                i2c_unregister_device(state->i2c_cp);
        if (state->i2c_vdp)
                i2c_unregister_device(state->i2c_vdp);

        state->i2c_avlink = NULL;
        state->i2c_cec = NULL;
        state->i2c_infoframe = NULL;
        state->i2c_sdp_io = NULL;
        state->i2c_sdp = NULL;
        state->i2c_afe = NULL;
        state->i2c_repeater = NULL;
        state->i2c_edid = NULL;
        state->i2c_hdmi = NULL;
        state->i2c_cp = NULL;
        state->i2c_vdp = NULL;
}

static struct i2c_client *adv7842_dummy_client(struct v4l2_subdev *sd, const char *desc,
                                               u8 addr, u8 io_reg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct i2c_client *cp;

        io_write(sd, io_reg, addr << 1);

        if (addr == 0) {
                v4l2_err(sd, "no %s i2c addr configured\n", desc);
                return NULL;
        }

        cp = i2c_new_dummy(client->adapter, io_read(sd, io_reg) >> 1);
        if (!cp)
                v4l2_err(sd, "register %s on i2c addr 0x%x failed\n", desc, addr);

        return cp;
}

static int adv7842_register_clients(struct v4l2_subdev *sd)
{
        struct adv7842_state *state = to_state(sd);
        struct adv7842_platform_data *pdata = &state->pdata;

        state->i2c_avlink = adv7842_dummy_client(sd, "avlink", pdata->i2c_avlink, 0xf3);
        state->i2c_cec = adv7842_dummy_client(sd, "cec", pdata->i2c_cec, 0xf4);
        state->i2c_infoframe = adv7842_dummy_client(sd, "infoframe", pdata->i2c_infoframe, 0xf5);
        state->i2c_sdp_io = adv7842_dummy_client(sd, "sdp_io", pdata->i2c_sdp_io, 0xf2);
        state->i2c_sdp = adv7842_dummy_client(sd, "sdp", pdata->i2c_sdp, 0xf1);
        state->i2c_afe = adv7842_dummy_client(sd, "afe", pdata->i2c_afe, 0xf8);
        state->i2c_repeater = adv7842_dummy_client(sd, "repeater", pdata->i2c_repeater, 0xf9);
        state->i2c_edid = adv7842_dummy_client(sd, "edid", pdata->i2c_edid, 0xfa);
        state->i2c_hdmi = adv7842_dummy_client(sd, "hdmi", pdata->i2c_hdmi, 0xfb);
        state->i2c_cp = adv7842_dummy_client(sd, "cp", pdata->i2c_cp, 0xfd);
        state->i2c_vdp = adv7842_dummy_client(sd, "vdp", pdata->i2c_vdp, 0xfe);

        if (!state->i2c_avlink ||
            !state->i2c_cec ||
            !state->i2c_infoframe ||
            !state->i2c_sdp_io ||
            !state->i2c_sdp ||
            !state->i2c_afe ||
            !state->i2c_repeater ||
            !state->i2c_edid ||
            !state->i2c_hdmi ||
            !state->i2c_cp ||
            !state->i2c_vdp)
                return -1;

        return 0;
}

static int adv7842_probe(struct i2c_client *client,
                         const struct i2c_device_id *id)
{
        struct adv7842_state *state;
        static const struct v4l2_dv_timings cea640x480 =
                V4L2_DV_BT_CEA_640X480P59_94;
        struct adv7842_platform_data *pdata = client->dev.platform_data;
        struct v4l2_ctrl_handler *hdl;
        struct v4l2_subdev *sd;
        u16 rev;
        int err;

        /* Check if the adapter supports the needed features */
        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                return -EIO;

        v4l_dbg(1, debug, client, "detecting adv7842 client on address 0x%x\n",
                client->addr << 1);

        if (!pdata) {
                v4l_err(client, "No platform data!\n");
                return -ENODEV;
        }

        state = devm_kzalloc(&client->dev, sizeof(struct adv7842_state), GFP_KERNEL);
        if (!state) {
                v4l_err(client, "Could not allocate adv7842_state memory!\n");
                return -ENOMEM;
        }

        /* platform data */
        state->pdata = *pdata;
        state->timings = cea640x480;

        sd = &state->sd;
        v4l2_i2c_subdev_init(sd, client, &adv7842_ops);
        sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
        state->mode = pdata->mode;

        state->hdmi_port_a = pdata->input == ADV7842_SELECT_HDMI_PORT_A;
        state->restart_stdi_once = true;

        /* i2c access to adv7842? */
        rev = adv_smbus_read_byte_data_check(client, 0xea, false) << 8 |
                adv_smbus_read_byte_data_check(client, 0xeb, false);
        if (rev != 0x2012) {
                v4l2_info(sd, "got rev=0x%04x on first read attempt\n", rev);
                rev = adv_smbus_read_byte_data_check(client, 0xea, false) << 8 |
                        adv_smbus_read_byte_data_check(client, 0xeb, false);
        }
        if (rev != 0x2012) {
                v4l2_info(sd, "not an adv7842 on address 0x%x (rev=0x%04x)\n",
                          client->addr << 1, rev);
                return -ENODEV;
        }

        if (pdata->chip_reset)
                main_reset(sd);

        /* control handlers */
        hdl = &state->hdl;
        v4l2_ctrl_handler_init(hdl, 6);

        /* add in ascending ID order */
        v4l2_ctrl_new_std(hdl, &adv7842_ctrl_ops,