// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  adv7175 - adv7175a video encoder driver version 0.0.3
 *
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 * Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
 *    - some corrections for Pinnacle Systems Inc. DC10plus card.
 *
 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *    - moved over to linux>=2.4.x i2c protocol (9/9/2002)
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/ioctl.h>
#include <linux/uaccess.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>

MODULE_DESCRIPTION("Analog Devices ADV7175 video encoder driver");
MODULE_AUTHOR("Dave Perks");
MODULE_LICENSE("GPL");

#define   I2C_ADV7175        0xd4
#define   I2C_ADV7176        0x54


static int debug;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

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

struct adv7175 {
        struct v4l2_subdev sd;
        v4l2_std_id norm;
        int input;
};

static inline struct adv7175 *to_adv7175(struct v4l2_subdev *sd)
{
        return container_of(sd, struct adv7175, sd);
}

static char *inputs[] = { "pass_through", "play_back", "color_bar" };

static u32 adv7175_codes[] = {
        MEDIA_BUS_FMT_UYVY8_2X8,
        MEDIA_BUS_FMT_UYVY8_1X16,
};

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

static inline int adv7175_write(struct v4l2_subdev *sd, u8 reg, u8 value)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int adv7175_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 adv7175_write_block(struct v4l2_subdev *sd,
                     const u8 *data, unsigned int len)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = -1;
        u8 reg;

        /* the adv7175 has an autoincrement function, use it if
         * the adapter understands raw I2C */
        if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
                /* do raw I2C, not smbus compatible */
                u8 block_data[32];
                int block_len;

                while (len >= 2) {
                        block_len = 0;
                        block_data[block_len++] = reg = data[0];
                        do {
                                block_data[block_len++] = data[1];
                                reg++;
                                len -= 2;
                                data += 2;
                        } while (len >= 2 && data[0] == reg && block_len < 32);
                        ret = i2c_master_send(client, block_data, block_len);
                        if (ret < 0)
                                break;
                }
        } else {
                /* do some slow I2C emulation kind of thing */
                while (len >= 2) {
                        reg = *data++;
                        ret = adv7175_write(sd, reg, *data++);
                        if (ret < 0)
                                break;
                        len -= 2;
                }
        }

        return ret;
}

static void set_subcarrier_freq(struct v4l2_subdev *sd, int pass_through)
{
        /* for some reason pass_through NTSC needs
         * a different sub-carrier freq to remain stable. */
        if (pass_through)
                adv7175_write(sd, 0x02, 0x00);
        else
                adv7175_write(sd, 0x02, 0x55);

        adv7175_write(sd, 0x03, 0x55);
        adv7175_write(sd, 0x04, 0x55);
        adv7175_write(sd, 0x05, 0x25);
}

/* ----------------------------------------------------------------------- */
/* Output filter:  S-Video  Composite */

#define MR050       0x11        /* 0x09 */
#define MR060       0x14        /* 0x0c */

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

#define TR0MODE     0x46
#define TR0RST      0x80

#define TR1CAPT     0x80
#define TR1PLAY     0x00

static const unsigned char init_common[] = {

        0x00, MR050,            /* MR0, PAL enabled */
        0x01, 0x00,             /* MR1 */
        0x02, 0x0c,             /* subc. freq. */
        0x03, 0x8c,             /* subc. freq. */
        0x04, 0x79,             /* subc. freq. */
        0x05, 0x26,             /* subc. freq. */
        0x06, 0x40,             /* subc. phase */

        0x07, TR0MODE,          /* TR0, 16bit */
        0x08, 0x21,             /*  */
        0x09, 0x00,             /*  */
        0x0a, 0x00,             /*  */
        0x0b, 0x00,             /*  */
        0x0c, TR1CAPT,          /* TR1 */
        0x0d, 0x4f,             /* MR2 */
        0x0e, 0x00,             /*  */
        0x0f, 0x00,             /*  */
        0x10, 0x00,             /*  */
        0x11, 0x00,             /*  */
};

static const unsigned char init_pal[] = {
        0x00, MR050,            /* MR0, PAL enabled */
        0x01, 0x00,             /* MR1 */
        0x02, 0x0c,             /* subc. freq. */
        0x03, 0x8c,             /* subc. freq. */
        0x04, 0x79,             /* subc. freq. */
        0x05, 0x26,             /* subc. freq. */
        0x06, 0x40,             /* subc. phase */
};

static const unsigned char init_ntsc[] = {
        0x00, MR060,            /* MR0, NTSC enabled */
        0x01, 0x00,             /* MR1 */
        0x02, 0x55,             /* subc. freq. */
        0x03, 0x55,             /* subc. freq. */
        0x04, 0x55,             /* subc. freq. */
        0x05, 0x25,             /* subc. freq. */
        0x06, 0x1a,             /* subc. phase */
};

static int adv7175_init(struct v4l2_subdev *sd, u32 val)
{
        /* This is just for testing!!! */
        adv7175_write_block(sd, init_common, sizeof(init_common));
        adv7175_write(sd, 0x07, TR0MODE | TR0RST);
        adv7175_write(sd, 0x07, TR0MODE);
        return 0;
}

static int adv7175_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
{
        struct adv7175 *encoder = to_adv7175(sd);

        if (std & V4L2_STD_NTSC) {
                adv7175_write_block(sd, init_ntsc, sizeof(init_ntsc));
                if (encoder->input == 0)
                        adv7175_write(sd, 0x0d, 0x4f);  /* Enable genlock */
                adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                adv7175_write(sd, 0x07, TR0MODE);
        } else if (std & V4L2_STD_PAL) {
                adv7175_write_block(sd, init_pal, sizeof(init_pal));
                if (encoder->input == 0)
                        adv7175_write(sd, 0x0d, 0x4f);  /* Enable genlock */
                adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                adv7175_write(sd, 0x07, TR0MODE);
        } else if (std & V4L2_STD_SECAM) {
                /* This is an attempt to convert
                 * SECAM->PAL (typically it does not work
                 * due to genlock: when decoder is in SECAM
                 * and encoder in in PAL the subcarrier can
                 * not be synchronized with horizontal
                 * quency) */
                adv7175_write_block(sd, init_pal, sizeof(init_pal));
                if (encoder->input == 0)
                        adv7175_write(sd, 0x0d, 0x49);  /* Disable genlock */
                adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                adv7175_write(sd, 0x07, TR0MODE);
        } else {
                v4l2_dbg(1, debug, sd, "illegal norm: %llx\n",
                                (unsigned long long)std);
                return -EINVAL;
        }
        v4l2_dbg(1, debug, sd, "switched to %llx\n", (unsigned long long)std);
        encoder->norm = std;
        return 0;
}

static int adv7175_s_routing(struct v4l2_subdev *sd,
                             u32 input, u32 output, u32 config)
{
        struct adv7175 *encoder = to_adv7175(sd);

        /* RJ: input = 0: input is from decoder
           input = 1: input is from ZR36060
           input = 2: color bar */

        switch (input) {
        case 0:
                adv7175_write(sd, 0x01, 0x00);

                if (encoder->norm & V4L2_STD_NTSC)
                        set_subcarrier_freq(sd, 1);

                adv7175_write(sd, 0x0c, TR1CAPT);       /* TR1 */
                if (encoder->norm & V4L2_STD_SECAM)
                        adv7175_write(sd, 0x0d, 0x49);  /* Disable genlock */
                else
                        adv7175_write(sd, 0x0d, 0x4f);  /* Enable genlock */
                adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                adv7175_write(sd, 0x07, TR0MODE);
                /*udelay(10);*/
                break;

        case 1:
                adv7175_write(sd, 0x01, 0x00);

                if (encoder->norm & V4L2_STD_NTSC)
                        set_subcarrier_freq(sd, 0);

                adv7175_write(sd, 0x0c, TR1PLAY);       /* TR1 */
                adv7175_write(sd, 0x0d, 0x49);
                adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                adv7175_write(sd, 0x07, TR0MODE);
                /* udelay(10); */
                break;

        case 2:
                adv7175_write(sd, 0x01, 0x80);

                if (encoder->norm & V4L2_STD_NTSC)
                        set_subcarrier_freq(sd, 0);

                adv7175_write(sd, 0x0d, 0x49);
                adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                adv7175_write(sd, 0x07, TR0MODE);
                /* udelay(10); */
                break;

        default:
                v4l2_dbg(1, debug, sd, "illegal input: %d\n", input);
                return -EINVAL;
        }
        v4l2_dbg(1, debug, sd, "switched to %s\n", inputs[input]);
        encoder->input = input;
        return 0;
}

static int adv7175_enum_mbus_code(struct v4l2_subdev *sd,
                struct v4l2_subdev_pad_config *cfg,
                struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->pad || code->index >= ARRAY_SIZE(adv7175_codes))
                return -EINVAL;

        code->code = adv7175_codes[code->index];
        return 0;
}

static int adv7175_get_fmt(struct v4l2_subdev *sd,
                struct v4l2_subdev_pad_config *cfg,
                struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *mf = &format->format;
        u8 val = adv7175_read(sd, 0x7);

        if (format->pad)
                return -EINVAL;

        if ((val & 0x40) == (1 << 6))
                mf->code = MEDIA_BUS_FMT_UYVY8_1X16;
        else
                mf->code = MEDIA_BUS_FMT_UYVY8_2X8;

        mf->colorspace  = V4L2_COLORSPACE_SMPTE170M;
        mf->width       = 0;
        mf->height      = 0;
        mf->field       = V4L2_FIELD_ANY;

        return 0;
}

static int adv7175_set_fmt(struct v4l2_subdev *sd,
                struct v4l2_subdev_pad_config *cfg,
                struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *mf = &format->format;
        u8 val = adv7175_read(sd, 0x7);
        int ret = 0;

        if (format->pad)
                return -EINVAL;

        switch (mf->code) {
        case MEDIA_BUS_FMT_UYVY8_2X8:
                val &= ~0x40;
                break;

        case MEDIA_BUS_FMT_UYVY8_1X16:
                val |= 0x40;
                break;

        default:
                v4l2_dbg(1, debug, sd,
                        "illegal v4l2_mbus_framefmt code: %d\n", mf->code);
                return -EINVAL;
        }

        if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
                ret = adv7175_write(sd, 0x7, val);

        return ret;
}

static int adv7175_s_power(struct v4l2_subdev *sd, int on)
{
        if (on)
                adv7175_write(sd, 0x01, 0x00);
        else
                adv7175_write(sd, 0x01, 0x78);

        return 0;
}

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

static const struct v4l2_subdev_core_ops adv7175_core_ops = {
        .init = adv7175_init,
        .s_power = adv7175_s_power,
};

static const struct v4l2_subdev_video_ops adv7175_video_ops = {
        .s_std_output = adv7175_s_std_output,
        .s_routing = adv7175_s_routing,
};

static const struct v4l2_subdev_pad_ops adv7175_pad_ops = {
        .enum_mbus_code = adv7175_enum_mbus_code,
        .get_fmt = adv7175_get_fmt,
        .set_fmt = adv7175_set_fmt,
};

static const struct v4l2_subdev_ops adv7175_ops = {
        .core = &adv7175_core_ops,
        .video = &adv7175_video_ops,
        .pad = &adv7175_pad_ops,
};

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

static int adv7175_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
{
        int i;
        struct adv7175 *encoder;
        struct v4l2_subdev *sd;

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

        v4l_info(client, "chip found @ 0x%x (%s)\n",
                        client->addr << 1, client->adapter->name);

        encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
        if (encoder == NULL)
                return -ENOMEM;
        sd = &encoder->sd;
        v4l2_i2c_subdev_init(sd, client, &adv7175_ops);
        encoder->norm = V4L2_STD_NTSC;
        encoder->input = 0;

        i = adv7175_write_block(sd, init_common, sizeof(init_common));
        if (i >= 0) {
                i = adv7175_write(sd, 0x07, TR0MODE | TR0RST);
                i = adv7175_write(sd, 0x07, TR0MODE);
                i = adv7175_read(sd, 0x12);
                v4l2_dbg(1, debug, sd, "revision %d\n", i & 1);
        }
        if (i < 0)
                v4l2_dbg(1, debug, sd, "init error 0x%x\n", i);
        return 0;
}

static int adv7175_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);

        v4l2_device_unregister_subdev(sd);
        return 0;
}

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

static const struct i2c_device_id adv7175_id[] = {
        { "adv7175", 0 },
        { "adv7176", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, adv7175_id);

static struct i2c_driver adv7175_driver = {
        .driver = {
                .name   = "adv7175",
        },
        .probe          = adv7175_probe,
        .remove         = adv7175_remove,
        .id_table       = adv7175_id,
};

module_i2c_driver(adv7175_driver);