saa7127.c

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/*
 * saa7127 - Philips SAA7127/SAA7129 video encoder driver
 *
 * Copyright (C) 2003 Roy Bulter <[email protected]>
 *
 * Based on SAA7126 video encoder driver by Gillem & Andreas Oberritter
 *
 * Copyright (C) 2000-2001 Gillem <[email protected]>
 * Copyright (C) 2002 Andreas Oberritter <[email protected]>
 *
 * Based on Stadis 4:2:2 MPEG-2 Decoder Driver by Nathan Laredo
 *
 * Copyright (C) 1999 Nathan Laredo <[email protected]>
 *
 * This driver is designed for the Hauppauge 250/350 Linux driver
 * from the ivtv Project
 *
 * Copyright (C) 2003 Kevin Thayer <[email protected]>
 *
 * Dual output support:
 * Copyright (C) 2004 Eric Varsanyi
 *
 * NTSC Tuning and 7.5 IRE Setup
 * Copyright (C) 2004  Chris Kennedy <[email protected]>
 *
 * VBI additions & cleanup:
 * Copyright (C) 2004, 2005 Hans Verkuil <[email protected]>
 *
 * Note: the saa7126 is identical to the saa7127, and the saa7128 is
 * identical to the saa7129, except that the saa7126 and saa7128 have
 * macrovision anti-taping support. This driver will almost certainly
 * work fine for those chips, except of course for the missing anti-taping
 * support.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/saa7127.h>

static int debug;
static int test_image;

MODULE_DESCRIPTION("Philips SAA7127/9 video encoder driver");
MODULE_AUTHOR("Kevin Thayer, Chris Kennedy, Hans Verkuil");
MODULE_LICENSE("GPL");
module_param(debug, int, 0644);
module_param(test_image, int, 0644);
MODULE_PARM_DESC(debug, "debug level (0-2)");
MODULE_PARM_DESC(test_image, "test_image (0-1)");


/*
 * SAA7127 registers
 */

#define SAA7127_REG_STATUS                           0x00
#define SAA7127_REG_WIDESCREEN_CONFIG                0x26
#define SAA7127_REG_WIDESCREEN_ENABLE                0x27
#define SAA7127_REG_BURST_START                      0x28
#define SAA7127_REG_BURST_END                        0x29
#define SAA7127_REG_COPYGEN_0                        0x2a
#define SAA7127_REG_COPYGEN_1                        0x2b
#define SAA7127_REG_COPYGEN_2                        0x2c
#define SAA7127_REG_OUTPUT_PORT_CONTROL              0x2d
#define SAA7127_REG_GAIN_LUMINANCE_RGB               0x38
#define SAA7127_REG_GAIN_COLORDIFF_RGB               0x39
#define SAA7127_REG_INPUT_PORT_CONTROL_1             0x3a
#define SAA7129_REG_FADE_KEY_COL2            0x4f
#define SAA7127_REG_CHROMA_PHASE                     0x5a
#define SAA7127_REG_GAINU                            0x5b
#define SAA7127_REG_GAINV                            0x5c
#define SAA7127_REG_BLACK_LEVEL                      0x5d
#define SAA7127_REG_BLANKING_LEVEL                   0x5e
#define SAA7127_REG_VBI_BLANKING                     0x5f
#define SAA7127_REG_DAC_CONTROL                      0x61
#define SAA7127_REG_BURST_AMP                        0x62
#define SAA7127_REG_SUBC3                            0x63
#define SAA7127_REG_SUBC2                            0x64
#define SAA7127_REG_SUBC1                            0x65
#define SAA7127_REG_SUBC0                            0x66
#define SAA7127_REG_LINE_21_ODD_0                    0x67
#define SAA7127_REG_LINE_21_ODD_1                    0x68
#define SAA7127_REG_LINE_21_EVEN_0                   0x69
#define SAA7127_REG_LINE_21_EVEN_1                   0x6a
#define SAA7127_REG_RCV_PORT_CONTROL                 0x6b
#define SAA7127_REG_VTRIG                            0x6c
#define SAA7127_REG_HTRIG_HI                         0x6d
#define SAA7127_REG_MULTI                            0x6e
#define SAA7127_REG_CLOSED_CAPTION                   0x6f
#define SAA7127_REG_RCV2_OUTPUT_START                0x70
#define SAA7127_REG_RCV2_OUTPUT_END                  0x71
#define SAA7127_REG_RCV2_OUTPUT_MSBS                 0x72
#define SAA7127_REG_TTX_REQUEST_H_START              0x73
#define SAA7127_REG_TTX_REQUEST_H_DELAY_LENGTH       0x74
#define SAA7127_REG_CSYNC_ADVANCE_VSYNC_SHIFT        0x75
#define SAA7127_REG_TTX_ODD_REQ_VERT_START           0x76
#define SAA7127_REG_TTX_ODD_REQ_VERT_END             0x77
#define SAA7127_REG_TTX_EVEN_REQ_VERT_START          0x78
#define SAA7127_REG_TTX_EVEN_REQ_VERT_END            0x79
#define SAA7127_REG_FIRST_ACTIVE                     0x7a
#define SAA7127_REG_LAST_ACTIVE                      0x7b
#define SAA7127_REG_MSB_VERTICAL                     0x7c
#define SAA7127_REG_DISABLE_TTX_LINE_LO_0            0x7e
#define SAA7127_REG_DISABLE_TTX_LINE_LO_1            0x7f

/*
 **********************************************************************
 *
 *  Arrays with configuration parameters for the SAA7127
 *
 **********************************************************************
 */

struct i2c_reg_value {
    unsigned char reg;
    unsigned char value;
};

static const struct i2c_reg_value saa7129_init_config_extra[] = {
    { SAA7127_REG_OUTPUT_PORT_CONTROL,      0x38 },
    { SAA7127_REG_VTRIG,                0xfa },
    { 0, 0 }
};

static const struct i2c_reg_value saa7127_init_config_common[] = {
    { SAA7127_REG_WIDESCREEN_CONFIG,        0x0d },
    { SAA7127_REG_WIDESCREEN_ENABLE,        0x00 },
    { SAA7127_REG_COPYGEN_0,            0x77 },
    { SAA7127_REG_COPYGEN_1,            0x41 },
    { SAA7127_REG_COPYGEN_2,            0x00 }, /* Macrovision enable/disable */
    { SAA7127_REG_OUTPUT_PORT_CONTROL,      0xbf },
    { SAA7127_REG_GAIN_LUMINANCE_RGB,       0x00 },
    { SAA7127_REG_GAIN_COLORDIFF_RGB,       0x00 },
    { SAA7127_REG_INPUT_PORT_CONTROL_1,         0x80 }, /* for color bars */
    { SAA7127_REG_LINE_21_ODD_0,            0x77 },
    { SAA7127_REG_LINE_21_ODD_1,            0x41 },
    { SAA7127_REG_LINE_21_EVEN_0,           0x88 },
    { SAA7127_REG_LINE_21_EVEN_1,           0x41 },
    { SAA7127_REG_RCV_PORT_CONTROL,         0x12 },
    { SAA7127_REG_VTRIG,                0xf9 },
    { SAA7127_REG_HTRIG_HI,             0x00 },
    { SAA7127_REG_RCV2_OUTPUT_START,        0x41 },
    { SAA7127_REG_RCV2_OUTPUT_END,          0xc3 },
    { SAA7127_REG_RCV2_OUTPUT_MSBS,         0x00 },
    { SAA7127_REG_TTX_REQUEST_H_START,      0x3e },
    { SAA7127_REG_TTX_REQUEST_H_DELAY_LENGTH,   0xb8 },
    { SAA7127_REG_CSYNC_ADVANCE_VSYNC_SHIFT,    0x03 },
    { SAA7127_REG_TTX_ODD_REQ_VERT_START,       0x15 },
    { SAA7127_REG_TTX_ODD_REQ_VERT_END,         0x16 },
    { SAA7127_REG_TTX_EVEN_REQ_VERT_START,      0x15 },
    { SAA7127_REG_TTX_EVEN_REQ_VERT_END,        0x16 },
    { SAA7127_REG_FIRST_ACTIVE,             0x1a },
    { SAA7127_REG_LAST_ACTIVE,          0x01 },
    { SAA7127_REG_MSB_VERTICAL,             0xc0 },
    { SAA7127_REG_DISABLE_TTX_LINE_LO_0,        0x00 },
    { SAA7127_REG_DISABLE_TTX_LINE_LO_1,        0x00 },
    { 0, 0 }
};

#define SAA7127_60HZ_DAC_CONTROL 0x15
static const struct i2c_reg_value saa7127_init_config_60hz[] = {
    { SAA7127_REG_BURST_START,          0x19 },
    /* BURST_END is also used as a chip ID in saa7127_probe */
    { SAA7127_REG_BURST_END,            0x1d },
    { SAA7127_REG_CHROMA_PHASE,             0xa3 },
    { SAA7127_REG_GAINU,                0x98 },
    { SAA7127_REG_GAINV,                0xd3 },
    { SAA7127_REG_BLACK_LEVEL,          0x39 },
    { SAA7127_REG_BLANKING_LEVEL,           0x2e },
    { SAA7127_REG_VBI_BLANKING,             0x2e },
    { SAA7127_REG_DAC_CONTROL,          0x15 },
    { SAA7127_REG_BURST_AMP,            0x4d },
    { SAA7127_REG_SUBC3,                0x1f },
    { SAA7127_REG_SUBC2,                0x7c },
    { SAA7127_REG_SUBC1,                0xf0 },
    { SAA7127_REG_SUBC0,                0x21 },
    { SAA7127_REG_MULTI,                0x90 },
    { SAA7127_REG_CLOSED_CAPTION,           0x11 },
    { 0, 0 }
};

#define SAA7127_50HZ_PAL_DAC_CONTROL 0x02
static struct i2c_reg_value saa7127_init_config_50hz_pal[] = {
    { SAA7127_REG_BURST_START,          0x21 },
    /* BURST_END is also used as a chip ID in saa7127_probe */
    { SAA7127_REG_BURST_END,            0x1d },
    { SAA7127_REG_CHROMA_PHASE,             0x3f },
    { SAA7127_REG_GAINU,                0x7d },
    { SAA7127_REG_GAINV,                0xaf },
    { SAA7127_REG_BLACK_LEVEL,          0x33 },
    { SAA7127_REG_BLANKING_LEVEL,           0x35 },
    { SAA7127_REG_VBI_BLANKING,             0x35 },
    { SAA7127_REG_DAC_CONTROL,          0x02 },
    { SAA7127_REG_BURST_AMP,            0x2f },
    { SAA7127_REG_SUBC3,                0xcb },
    { SAA7127_REG_SUBC2,                0x8a },
    { SAA7127_REG_SUBC1,                0x09 },
    { SAA7127_REG_SUBC0,                0x2a },
    { SAA7127_REG_MULTI,                0xa0 },
    { SAA7127_REG_CLOSED_CAPTION,           0x00 },
    { 0, 0 }
};

#define SAA7127_50HZ_SECAM_DAC_CONTROL 0x08
static struct i2c_reg_value saa7127_init_config_50hz_secam[] = {
    { SAA7127_REG_BURST_START,          0x21 },
    /* BURST_END is also used as a chip ID in saa7127_probe */
    { SAA7127_REG_BURST_END,            0x1d },
    { SAA7127_REG_CHROMA_PHASE,             0x3f },
    { SAA7127_REG_GAINU,                0x6a },
    { SAA7127_REG_GAINV,                0x81 },
    { SAA7127_REG_BLACK_LEVEL,          0x33 },
    { SAA7127_REG_BLANKING_LEVEL,           0x35 },
    { SAA7127_REG_VBI_BLANKING,             0x35 },
    { SAA7127_REG_DAC_CONTROL,          0x08 },
    { SAA7127_REG_BURST_AMP,            0x2f },
    { SAA7127_REG_SUBC3,                0xb2 },
    { SAA7127_REG_SUBC2,                0x3b },
    { SAA7127_REG_SUBC1,                0xa3 },
    { SAA7127_REG_SUBC0,                0x28 },
    { SAA7127_REG_MULTI,                0x90 },
    { SAA7127_REG_CLOSED_CAPTION,           0x00 },
    { 0, 0 }
};

/*
 **********************************************************************
 *
 *  Encoder Struct, holds the configuration state of the encoder
 *
 **********************************************************************
 */

struct saa7127_state {
    struct v4l2_subdev sd;
    v4l2_std_id std;
    u32 ident;
    enum saa7127_input_type input_type;
    enum saa7127_output_type output_type;
    int video_enable;
    int wss_enable;
    u16 wss_mode;
    int cc_enable;
    u16 cc_data;
    int xds_enable;
    u16 xds_data;
    int vps_enable;
    u8 vps_data[5];
    u8 reg_2d;
    u8 reg_3a;
    u8 reg_3a_cb;   /* colorbar bit */
    u8 reg_61;
};

static inline struct saa7127_state *to_state(struct v4l2_subdev *sd)
{
    return container_of(sd, struct saa7127_state, sd);
}

static const char * const output_strs[] =
{
    "S-Video + Composite",
    "Composite",
    "S-Video",
    "RGB",
    "YUV C",
    "YUV V"
};

static const char * const wss_strs[] = {
    "invalid",
    "letterbox 14:9 center",
    "letterbox 14:9 top",
    "invalid",
    "letterbox 16:9 top",
    "invalid",
    "invalid",
    "16:9 full format anamorphic",
    "4:3 full format",
    "invalid",
    "invalid",
    "letterbox 16:9 center",
    "invalid",
    "letterbox >16:9 center",
    "14:9 full format center",
    "invalid",
};

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

static int saa7127_read(struct v4l2_subdev *sd, u8 reg)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);

    return i2c_smbus_read_byte_data(client, reg);
}

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

static int saa7127_write(struct v4l2_subdev *sd, u8 reg, u8 val)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);
    int i;

    for (i = 0; i < 3; i++) {
        if (i2c_smbus_write_byte_data(client, reg, val) == 0)
            return 0;
    }
    v4l2_err(sd, "I2C Write Problem\n");
    return -1;
}

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

static int saa7127_write_inittab(struct v4l2_subdev *sd,
                 const struct i2c_reg_value *regs)
{
    while (regs->reg != 0) {
        saa7127_write(sd, regs->reg, regs->value);
        regs++;
    }
    return 0;
}

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

static int saa7127_set_vps(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *data)
{
    struct saa7127_state *state = to_state(sd);
    int enable = (data->line != 0);

    if (enable && (data->field != 0 || data->line != 16))
        return -EINVAL;
    if (state->vps_enable != enable) {
        v4l2_dbg(1, debug, sd, "Turn VPS Signal %s\n", enable ? "on" : "off");
        saa7127_write(sd, 0x54, enable << 7);
        state->vps_enable = enable;
    }
    if (!enable)
        return 0;

    state->vps_data[0] = data->data[2];
    state->vps_data[1] = data->data[8];
    state->vps_data[2] = data->data[9];
    state->vps_data[3] = data->data[10];
    state->vps_data[4] = data->data[11];
    v4l2_dbg(1, debug, sd, "Set VPS data %*ph\n", 5, state->vps_data);
    saa7127_write(sd, 0x55, state->vps_data[0]);
    saa7127_write(sd, 0x56, state->vps_data[1]);
    saa7127_write(sd, 0x57, state->vps_data[2]);
    saa7127_write(sd, 0x58, state->vps_data[3]);
    saa7127_write(sd, 0x59, state->vps_data[4]);
    return 0;
}

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

static int saa7127_set_cc(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *data)
{
    struct saa7127_state *state = to_state(sd);
    u16 cc = data->data[1] << 8 | data->data[0];
    int enable = (data->line != 0);

    if (enable && (data->field != 0 || data->line != 21))
        return -EINVAL;
    if (state->cc_enable != enable) {
        v4l2_dbg(1, debug, sd,
            "Turn CC %s\n", enable ? "on" : "off");
        saa7127_write(sd, SAA7127_REG_CLOSED_CAPTION,
            (state->xds_enable << 7) | (enable << 6) | 0x11);
        state->cc_enable = enable;
    }
    if (!enable)
        return 0;

    v4l2_dbg(2, debug, sd, "CC data: %04x\n", cc);
    saa7127_write(sd, SAA7127_REG_LINE_21_ODD_0, cc & 0xff);
    saa7127_write(sd, SAA7127_REG_LINE_21_ODD_1, cc >> 8);
    state->cc_data = cc;
    return 0;
}

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

static int saa7127_set_xds(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *data)
{
    struct saa7127_state *state = to_state(sd);
    u16 xds = data->data[1] << 8 | data->data[0];
    int enable = (data->line != 0);

    if (enable && (data->field != 1 || data->line != 21))
        return -EINVAL;
    if (state->xds_enable != enable) {
        v4l2_dbg(1, debug, sd, "Turn XDS %s\n", enable ? "on" : "off");
        saa7127_write(sd, SAA7127_REG_CLOSED_CAPTION,
                (enable << 7) | (state->cc_enable << 6) | 0x11);
        state->xds_enable = enable;
    }
    if (!enable)
        return 0;

    v4l2_dbg(2, debug, sd, "XDS data: %04x\n", xds);
    saa7127_write(sd, SAA7127_REG_LINE_21_EVEN_0, xds & 0xff);
    saa7127_write(sd, SAA7127_REG_LINE_21_EVEN_1, xds >> 8);
    state->xds_data = xds;
    return 0;
}

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

static int saa7127_set_wss(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *data)
{
    struct saa7127_state *state = to_state(sd);
    int enable = (data->line != 0);

    if (enable && (data->field != 0 || data->line != 23))
        return -EINVAL;
    if (state->wss_enable != enable) {
        v4l2_dbg(1, debug, sd, "Turn WSS %s\n", enable ? "on" : "off");
        saa7127_write(sd, 0x27, enable << 7);
        state->wss_enable = enable;
    }
    if (!enable)
        return 0;

    saa7127_write(sd, 0x26, data->data[0]);
    saa7127_write(sd, 0x27, 0x80 | (data->data[1] & 0x3f));
    v4l2_dbg(1, debug, sd,
        "WSS mode: %s\n", wss_strs[data->data[0] & 0xf]);
    state->wss_mode = (data->data[1] & 0x3f) << 8 | data->data[0];
    return 0;
}

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

static int saa7127_set_video_enable(struct v4l2_subdev *sd, int enable)
{
    struct saa7127_state *state = to_state(sd);

    if (enable) {
        v4l2_dbg(1, debug, sd, "Enable Video Output\n");
        saa7127_write(sd, 0x2d, state->reg_2d);
        saa7127_write(sd, 0x61, state->reg_61);
    } else {
        v4l2_dbg(1, debug, sd, "Disable Video Output\n");
        saa7127_write(sd, 0x2d, (state->reg_2d & 0xf0));
        saa7127_write(sd, 0x61, (state->reg_61 | 0xc0));
    }
    state->video_enable = enable;
    return 0;
}

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

static int saa7127_set_std(struct v4l2_subdev *sd, v4l2_std_id std)
{
    struct saa7127_state *state = to_state(sd);
    const struct i2c_reg_value *inittab;

    if (std & V4L2_STD_525_60) {
        v4l2_dbg(1, debug, sd, "Selecting 60 Hz video Standard\n");
        inittab = saa7127_init_config_60hz;
        state->reg_61 = SAA7127_60HZ_DAC_CONTROL;

    } else if (state->ident == V4L2_IDENT_SAA7129 &&
           (std & V4L2_STD_SECAM) &&
           !(std & (V4L2_STD_625_50 & ~V4L2_STD_SECAM))) {

        /* If and only if SECAM, with a SAA712[89] */
        v4l2_dbg(1, debug, sd,
             "Selecting 50 Hz SECAM video Standard\n");
        inittab = saa7127_init_config_50hz_secam;
        state->reg_61 = SAA7127_50HZ_SECAM_DAC_CONTROL;

    } else {
        v4l2_dbg(1, debug, sd, "Selecting 50 Hz PAL video Standard\n");
        inittab = saa7127_init_config_50hz_pal;
        state->reg_61 = SAA7127_50HZ_PAL_DAC_CONTROL;
    }

    /* Write Table */
    saa7127_write_inittab(sd, inittab);
    state->std = std;
    return 0;
}

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

static int saa7127_set_output_type(struct v4l2_subdev *sd, int output)
{
    struct saa7127_state *state = to_state(sd);

    switch (output) {
    case SAA7127_OUTPUT_TYPE_RGB:
        state->reg_2d = 0x0f;   /* RGB + CVBS (for sync) */
        state->reg_3a = 0x13;   /* by default switch YUV to RGB-matrix on */
        break;

    case SAA7127_OUTPUT_TYPE_COMPOSITE:
        if (state->ident == V4L2_IDENT_SAA7129)
            state->reg_2d = 0x20;   /* CVBS only */
        else
            state->reg_2d = 0x08;   /* 00001000 CVBS only, RGB DAC's off (high impedance mode) */
        state->reg_3a = 0x13;   /* by default switch YUV to RGB-matrix on */
        break;

    case SAA7127_OUTPUT_TYPE_SVIDEO:
        if (state->ident == V4L2_IDENT_SAA7129)
            state->reg_2d = 0x18;   /* Y + C */
        else
            state->reg_2d = 0xff;   /*11111111  croma -> R, luma -> CVBS + G + B */
        state->reg_3a = 0x13;   /* by default switch YUV to RGB-matrix on */
        break;

    case SAA7127_OUTPUT_TYPE_YUV_V:
        state->reg_2d = 0x4f;   /* reg 2D = 01001111, all DAC's on, RGB + VBS */
        state->reg_3a = 0x0b;   /* reg 3A = 00001011, bypass RGB-matrix */
        break;

    case SAA7127_OUTPUT_TYPE_YUV_C:
        state->reg_2d = 0x0f;   /* reg 2D = 00001111, all DAC's on, RGB + CVBS */
        state->reg_3a = 0x0b;   /* reg 3A = 00001011, bypass RGB-matrix */
        break;

    case SAA7127_OUTPUT_TYPE_BOTH:
        if (state->ident == V4L2_IDENT_SAA7129)
            state->reg_2d = 0x38;
        else
            state->reg_2d = 0xbf;
        state->reg_3a = 0x13;   /* by default switch YUV to RGB-matrix on */
        break;

    default:
        return -EINVAL;
    }
    v4l2_dbg(1, debug, sd,
        "Selecting %s output type\n", output_strs[output]);

    /* Configure Encoder */
    saa7127_write(sd, 0x2d, state->reg_2d);
    saa7127_write(sd, 0x3a, state->reg_3a | state->reg_3a_cb);
    state->output_type = output;
    return 0;
}

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

static int saa7127_set_input_type(struct v4l2_subdev *sd, int input)
{
    struct saa7127_state *state = to_state(sd);

    switch (input) {
    case SAA7127_INPUT_TYPE_NORMAL: /* avia */
        v4l2_dbg(1, debug, sd, "Selecting Normal Encoder Input\n");
        state->reg_3a_cb = 0;
        break;

    case SAA7127_INPUT_TYPE_TEST_IMAGE: /* color bar */
        v4l2_dbg(1, debug, sd, "Selecting Color Bar generator\n");
        state->reg_3a_cb = 0x80;
        break;

    default:
        return -EINVAL;
    }
    saa7127_write(sd, 0x3a, state->reg_3a | state->reg_3a_cb);
    state->input_type = input;
    return 0;
}

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

static int saa7127_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
{
    struct saa7127_state *state = to_state(sd);

    if (state->std == std)
        return 0;
    return saa7127_set_std(sd, std);
}

static int saa7127_s_routing(struct v4l2_subdev *sd,
                 u32 input, u32 output, u32 config)
{
    struct saa7127_state *state = to_state(sd);
    int rc = 0;

    if (state->input_type != input)
        rc = saa7127_set_input_type(sd, input);
    if (rc == 0 && state->output_type != output)
        rc = saa7127_set_output_type(sd, output);
    return rc;
}

static int saa7127_s_stream(struct v4l2_subdev *sd, int enable)
{
    struct saa7127_state *state = to_state(sd);

    if (state->video_enable == enable)
        return 0;
    return saa7127_set_video_enable(sd, enable);
}

static int saa7127_g_sliced_fmt(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_format *fmt)
{
    struct saa7127_state *state = to_state(sd);

    memset(fmt->service_lines, 0, sizeof(fmt->service_lines));
    if (state->vps_enable)
        fmt->service_lines[0][16] = V4L2_SLICED_VPS;
    if (state->wss_enable)
        fmt->service_lines[0][23] = V4L2_SLICED_WSS_625;
    if (state->cc_enable) {
        fmt->service_lines[0][21] = V4L2_SLICED_CAPTION_525;
        fmt->service_lines[1][21] = V4L2_SLICED_CAPTION_525;
    }
    fmt->service_set =
        (state->vps_enable ? V4L2_SLICED_VPS : 0) |
        (state->wss_enable ? V4L2_SLICED_WSS_625 : 0) |
        (state->cc_enable ? V4L2_SLICED_CAPTION_525 : 0);
    return 0;
}

static int saa7127_s_vbi_data(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *data)
{
    switch (data->id) {
    case V4L2_SLICED_WSS_625:
        return saa7127_set_wss(sd, data);
    case V4L2_SLICED_VPS:
        return saa7127_set_vps(sd, data);
    case V4L2_SLICED_CAPTION_525:
        if (data->field == 0)
            return saa7127_set_cc(sd, data);
        return saa7127_set_xds(sd, data);
    default:
        return -EINVAL;
    }
    return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int saa7127_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);

    if (!v4l2_chip_match_i2c_client(client, &reg->match))
        return -EINVAL;
    if (!capable(CAP_SYS_ADMIN))
        return -EPERM;
    reg->val = saa7127_read(sd, reg->reg & 0xff);
    reg->size = 1;
    return 0;
}

static int saa7127_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
    struct i2c_client *client = v4l2_get_subdevdata(sd);

    if (!v4l2_chip_match_i2c_client(client, &reg->match))
        return -EINVAL;
    if (!capable(CAP_SYS_ADMIN))
        return -EPERM;
    saa7127_write(sd, reg->reg & 0xff, reg->val & 0xff);
    return 0;
}
#endif

static int saa7127_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
    struct saa7127_state *state = to_state(sd);
    struct i2c_client *client = v4l2_get_subdevdata(sd);

    return v4l2_chip_ident_i2c_client(client, chip, state->ident, 0);
}

static int saa7127_log_status(struct v4l2_subdev *sd)
{
    struct saa7127_state *state = to_state(sd);

    v4l2_info(sd, "Standard: %s\n", (state->std & V4L2_STD_525_60) ? "60 Hz" : "50 Hz");
    v4l2_info(sd, "Input:    %s\n", state->input_type ?  "color bars" : "normal");
    v4l2_info(sd, "Output:   %s\n", state->video_enable ?
            output_strs[state->output_type] : "disabled");
    v4l2_info(sd, "WSS:      %s\n", state->wss_enable ?
            wss_strs[state->wss_mode] : "disabled");
    v4l2_info(sd, "VPS:      %s\n", state->vps_enable ? "enabled" : "disabled");
    v4l2_info(sd, "CC:       %s\n", state->cc_enable ? "enabled" : "disabled");
    return 0;
}

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

static const struct v4l2_subdev_core_ops saa7127_core_ops = {
    .log_status = saa7127_log_status,
    .g_chip_ident = saa7127_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
    .g_register = saa7127_g_register,
    .s_register = saa7127_s_register,
#endif
};

static const struct v4l2_subdev_video_ops saa7127_video_ops = {
    .s_std_output = saa7127_s_std_output,
    .s_routing = saa7127_s_routing,
    .s_stream = saa7127_s_stream,
};

static const struct v4l2_subdev_vbi_ops saa7127_vbi_ops = {
    .s_vbi_data = saa7127_s_vbi_data,
    .g_sliced_fmt = saa7127_g_sliced_fmt,
};

static const struct v4l2_subdev_ops saa7127_ops = {
    .core = &saa7127_core_ops,
    .video = &saa7127_video_ops,
    .vbi = &saa7127_vbi_ops,
};

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

static int saa7127_probe(struct i2c_client *client,
             const struct i2c_device_id *id)
{
    struct saa7127_state *state;
    struct v4l2_subdev *sd;
    struct v4l2_sliced_vbi_data vbi = { 0, 0, 0, 0 };  /* set to disabled */

    /* 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 saa7127 client on address 0x%x\n",
            client->addr << 1);

    state = kzalloc(sizeof(struct saa7127_state), GFP_KERNEL);
    if (state == NULL)
        return -ENOMEM;

    sd = &state->sd;
    v4l2_i2c_subdev_init(sd, client, &saa7127_ops);

    /* First test register 0: Bits 5-7 are a version ID (should be 0),
       and bit 2 should also be 0.
       This is rather general, so the second test is more specific and
       looks at the 'ending point of burst in clock cycles' which is
       0x1d after a reset and not expected to ever change. */
    if ((saa7127_read(sd, 0) & 0xe4) != 0 ||
            (saa7127_read(sd, 0x29) & 0x3f) != 0x1d) {
        v4l2_dbg(1, debug, sd, "saa7127 not found\n");
        kfree(state);
        return -ENODEV;
    }

    if (id->driver_data) {  /* Chip type is already known */
        state->ident = id->driver_data;
    } else {        /* Needs detection */
        int read_result;

        /* Detect if it's an saa7129 */
        read_result = saa7127_read(sd, SAA7129_REG_FADE_KEY_COL2);
        saa7127_write(sd, SAA7129_REG_FADE_KEY_COL2, 0xaa);
        if (saa7127_read(sd, SAA7129_REG_FADE_KEY_COL2) == 0xaa) {
            saa7127_write(sd, SAA7129_REG_FADE_KEY_COL2,
                    read_result);
            state->ident = V4L2_IDENT_SAA7129;
            strlcpy(client->name, "saa7129", I2C_NAME_SIZE);
        } else {
            state->ident = V4L2_IDENT_SAA7127;
            strlcpy(client->name, "saa7127", I2C_NAME_SIZE);
        }
    }

    v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,
            client->addr << 1, client->adapter->name);

    v4l2_dbg(1, debug, sd, "Configuring encoder\n");
    saa7127_write_inittab(sd, saa7127_init_config_common);
    saa7127_set_std(sd, V4L2_STD_NTSC);
    saa7127_set_output_type(sd, SAA7127_OUTPUT_TYPE_BOTH);
    saa7127_set_vps(sd, &vbi);
    saa7127_set_wss(sd, &vbi);
    saa7127_set_cc(sd, &vbi);
    saa7127_set_xds(sd, &vbi);
    if (test_image == 1)
        /* The Encoder has an internal Colorbar generator */
        /* This can be used for debugging */
        saa7127_set_input_type(sd, SAA7127_INPUT_TYPE_TEST_IMAGE);
    else
        saa7127_set_input_type(sd, SAA7127_INPUT_TYPE_NORMAL);
    saa7127_set_video_enable(sd, 1);

    if (state->ident == V4L2_IDENT_SAA7129)
        saa7127_write_inittab(sd, saa7129_init_config_extra);
    return 0;
}

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

static int saa7127_remove(struct i2c_client *client)
{
    struct v4l2_subdev *sd = i2c_get_clientdata(client);

    v4l2_device_unregister_subdev(sd);
    /* Turn off TV output */
    saa7127_set_video_enable(sd, 0);
    kfree(to_state(sd));
    return 0;
}

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

static struct i2c_device_id saa7127_id[] = {
    { "saa7127_auto", 0 },  /* auto-detection */
    { "saa7126", V4L2_IDENT_SAA7127 },
    { "saa7127", V4L2_IDENT_SAA7127 },
    { "saa7128", V4L2_IDENT_SAA7129 },
    { "saa7129", V4L2_IDENT_SAA7129 },
    { }
};
MODULE_DEVICE_TABLE(i2c, saa7127_id);

static struct i2c_driver saa7127_driver = {
    .driver = {
        .owner  = THIS_MODULE,
        .name   = "saa7127",
    },
    .probe      = saa7127_probe,
    .remove     = saa7127_remove,
    .id_table   = saa7127_id,
};

module_i2c_driver(saa7127_driver);