/*
 * vpx3220a, vpx3216b & vpx3214c video decoder driver version 0.0.1
 *
 * Copyright (C) 2001 Laurent Pinchart <lpinchart@freegates.be>
 *
 * 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.
 */

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

MODULE_DESCRIPTION("vpx3220a/vpx3216b/vpx3214c video decoder driver");
MODULE_AUTHOR("Laurent Pinchart");
MODULE_LICENSE("GPL");

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


#define VPX_TIMEOUT_COUNT  10

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

struct vpx3220 {
        struct v4l2_subdev sd;
        struct v4l2_ctrl_handler hdl;
        unsigned char reg[255];

        v4l2_std_id norm;
        int input;
        int enable;
};

static inline struct vpx3220 *to_vpx3220(struct v4l2_subdev *sd)
{
        return container_of(sd, struct vpx3220, sd);
}

static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
        return &container_of(ctrl->handler, struct vpx3220, hdl)->sd;
}

static char *inputs[] = { "internal", "composite", "svideo" };

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

static inline int vpx3220_write(struct v4l2_subdev *sd, u8 reg, u8 value)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct vpx3220 *decoder = i2c_get_clientdata(client);

        decoder->reg[reg] = value;
        return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int vpx3220_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 vpx3220_fp_status(struct v4l2_subdev *sd)
{
        unsigned char status;
        unsigned int i;

        for (i = 0; i < VPX_TIMEOUT_COUNT; i++) {
                status = vpx3220_read(sd, 0x29);

                if (!(status & 4))
                        return 0;

                udelay(10);

                if (need_resched())
                        cond_resched();
        }

        return -1;
}

static int vpx3220_fp_write(struct v4l2_subdev *sd, u8 fpaddr, u16 data)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        /* Write the 16-bit address to the FPWR register */
        if (i2c_smbus_write_word_data(client, 0x27, swab16(fpaddr)) == -1) {
                v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
                return -1;
        }

        if (vpx3220_fp_status(sd) < 0)
                return -1;

        /* Write the 16-bit data to the FPDAT register */
        if (i2c_smbus_write_word_data(client, 0x28, swab16(data)) == -1) {
                v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
                return -1;
        }

        return 0;
}

static int vpx3220_fp_read(struct v4l2_subdev *sd, u16 fpaddr)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        s16 data;

        /* Write the 16-bit address to the FPRD register */
        if (i2c_smbus_write_word_data(client, 0x26, swab16(fpaddr)) == -1) {
                v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
                return -1;
        }

        if (vpx3220_fp_status(sd) < 0)
                return -1;

        /* Read the 16-bit data from the FPDAT register */
        data = i2c_smbus_read_word_data(client, 0x28);
        if (data == -1) {
                v4l2_dbg(1, debug, sd, "%s: failed\n", __func__);
                return -1;
        }

        return swab16(data);
}

static int vpx3220_write_block(struct v4l2_subdev *sd, const u8 *data, unsigned int len)
{
        u8 reg;
        int ret = -1;

        while (len >= 2) {
                reg = *data++;
                ret = vpx3220_write(sd, reg, *data++);
                if (ret < 0)
                        break;
                len -= 2;
        }

        return ret;
}

static int vpx3220_write_fp_block(struct v4l2_subdev *sd,
                const u16 *data, unsigned int len)
{
        u8 reg;
        int ret = 0;

        while (len > 1) {
                reg = *data++;
                ret |= vpx3220_fp_write(sd, reg, *data++);
                len -= 2;
        }

        return ret;
}

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

static const unsigned short init_ntsc[] = {
        0x1c, 0x00,             /* NTSC tint angle */
        0x88, 17,               /* Window 1 vertical */
        0x89, 240,              /* Vertical lines in */
        0x8a, 240,              /* Vertical lines out */
        0x8b, 000,              /* Horizontal begin */
        0x8c, 640,              /* Horizontal length */
        0x8d, 640,              /* Number of pixels */
        0x8f, 0xc00,            /* Disable window 2 */
        0xf0, 0x73,             /* 13.5 MHz transport, Forced
                                 * mode, latch windows */
        0xf2, 0x13,             /* NTSC M, composite input */
        0xe7, 0x1e1,            /* Enable vertical standard
                                 * locking @ 240 lines */
};

static const unsigned short init_pal[] = {
        0x88, 23,               /* Window 1 vertical begin */
        0x89, 288,              /* Vertical lines in (16 lines
                                 * skipped by the VFE) */
        0x8a, 288,              /* Vertical lines out (16 lines
                                 * skipped by the VFE) */
        0x8b, 16,               /* Horizontal begin */
        0x8c, 768,              /* Horizontal length */
        0x8d, 784,              /* Number of pixels
                                 * Must be >= Horizontal begin + Horizontal length */
        0x8f, 0xc00,            /* Disable window 2 */
        0xf0, 0x77,             /* 13.5 MHz transport, Forced
                                 * mode, latch windows */
        0xf2, 0x3d1,            /* PAL B,G,H,I, composite input */
        0xe7, 0x241,            /* PAL/SECAM set to 288 lines */
};

static const unsigned short init_secam[] = {
        0x88, 23,               /* Window 1 vertical begin */
        0x89, 288,              /* Vertical lines in (16 lines
                                 * skipped by the VFE) */
        0x8a, 288,              /* Vertical lines out (16 lines
                                 * skipped by the VFE) */
        0x8b, 16,               /* Horizontal begin */
        0x8c, 768,              /* Horizontal length */
        0x8d, 784,              /* Number of pixels
                                 * Must be >= Horizontal begin + Horizontal length */
        0x8f, 0xc00,            /* Disable window 2 */
        0xf0, 0x77,             /* 13.5 MHz transport, Forced
                                 * mode, latch windows */
        0xf2, 0x3d5,            /* SECAM, composite input */
        0xe7, 0x241,            /* PAL/SECAM set to 288 lines */
};

static const unsigned char init_common[] = {
        0xf2, 0x00,             /* Disable all outputs */
        0x33, 0x0d,             /* Luma : VIN2, Chroma : CIN
                                 * (clamp off) */
        0xd8, 0xa8,             /* HREF/VREF active high, VREF
                                 * pulse = 2, Odd/Even flag */
        0x20, 0x03,             /* IF compensation 0dB/oct */
        0xe0, 0xff,             /* Open up all comparators */
        0xe1, 0x00,
        0xe2, 0x7f,
        0xe3, 0x80,
        0xe4, 0x7f,
        0xe5, 0x80,
        0xe6, 0x00,             /* Brightness set to 0 */
        0xe7, 0xe0,             /* Contrast to 1.0, noise shaping
                                 * 10 to 8 2-bit error diffusion */
        0xe8, 0xf8,             /* YUV422, CbCr binary offset,
                                 * ... (p.32) */
        0xea, 0x18,             /* LLC2 connected, output FIFO
                                 * reset with VACTintern */
        0xf0, 0x8a,             /* Half full level to 10, bus
                                 * shuffler [7:0, 23:16, 15:8] */
        0xf1, 0x18,             /* Single clock, sync mode, no
                                 * FE delay, no HLEN counter */
        0xf8, 0x12,             /* Port A, PIXCLK, HF# & FE#
                                 * strength to 2 */
        0xf9, 0x24,             /* Port B, HREF, VREF, PREF &
                                 * ALPHA strength to 4 */
};

static const unsigned short init_fp[] = {
        0x59, 0,
        0xa0, 2070,             /* ACC reference */
        0xa3, 0,
        0xa4, 0,
        0xa8, 30,
        0xb2, 768,
        0xbe, 27,
        0x58, 0,
        0x26, 0,
        0x4b, 0x298,            /* PLL gain */
};


static int vpx3220_init(struct v4l2_subdev *sd, u32 val)
{
        struct vpx3220 *decoder = to_vpx3220(sd);

        vpx3220_write_block(sd, init_common, sizeof(init_common));
        vpx3220_write_fp_block(sd, init_fp, sizeof(init_fp) >> 1);
        if (decoder->norm & V4L2_STD_NTSC)
                vpx3220_write_fp_block(sd, init_ntsc, sizeof(init_ntsc) >> 1);
        else if (decoder->norm & V4L2_STD_PAL)
                vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
        else if (decoder->norm & V4L2_STD_SECAM)
                vpx3220_write_fp_block(sd, init_secam, sizeof(init_secam) >> 1);
        else
                vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
        return 0;
}

static int vpx3220_status(struct v4l2_subdev *sd, u32 *pstatus, v4l2_std_id *pstd)
{
        int res = V4L2_IN_ST_NO_SIGNAL, status;
        v4l2_std_id std = pstd ? *pstd : V4L2_STD_ALL;

        status = vpx3220_fp_read(sd, 0x0f3);

        v4l2_dbg(1, debug, sd, "status: 0x%04x\n", status);

        if (status < 0)
                return status;

        if ((status & 0x20) == 0) {
                res = 0;

                switch (status & 0x18) {
                case 0x00:
                case 0x10:
                case 0x14:
                case 0x18:
                        std &= V4L2_STD_PAL;
                        break;

                case 0x08:
                        std &= V4L2_STD_SECAM;
                        break;

                case 0x04:
                case 0x0c:
                case 0x1c:
                        std &= V4L2_STD_NTSC;
                        break;
                }
        } else {
                std = V4L2_STD_UNKNOWN;
        }
        if (pstd)
                *pstd = std;
        if (pstatus)
                *pstatus = res;
        return 0;
}

static int vpx3220_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
{
        v4l2_dbg(1, debug, sd, "querystd\n");
        return vpx3220_status(sd, NULL, std);
}

static int vpx3220_g_input_status(struct v4l2_subdev *sd, u32 *status)
{
        v4l2_dbg(1, debug, sd, "g_input_status\n");
        return vpx3220_status(sd, status, NULL);
}

static int vpx3220_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
{
        struct vpx3220 *decoder = to_vpx3220(sd);
        int temp_input;

        /* Here we back up the input selection because it gets
           overwritten when we fill the registers with the
           chosen video norm */
        temp_input = vpx3220_fp_read(sd, 0xf2);

        v4l2_dbg(1, debug, sd, "s_std %llx\n", (unsigned long long)std);
        if (std & V4L2_STD_NTSC) {
                vpx3220_write_fp_block(sd, init_ntsc, sizeof(init_ntsc) >> 1);
                v4l2_dbg(1, debug, sd, "norm switched to NTSC\n");
        } else if (std & V4L2_STD_PAL) {
                vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
                v4l2_dbg(1, debug, sd, "norm switched to PAL\n");
        } else if (std & V4L2_STD_SECAM) {
                vpx3220_write_fp_block(sd, init_secam, sizeof(init_secam) >> 1);
                v4l2_dbg(1, debug, sd, "norm switched to SECAM\n");
        } else {
                return -EINVAL;
        }

        decoder->norm = std;

        /* And here we set the backed up video input again */
        vpx3220_fp_write(sd, 0xf2, temp_input | 0x0010);
        udelay(10);
        return 0;
}

static int vpx3220_s_routing(struct v4l2_subdev *sd,
                             u32 input, u32 output, u32 config)
{
        int data;

        /* RJ:   input = 0: ST8 (PCTV) input
                 input = 1: COMPOSITE  input
                 input = 2: SVHS       input  */

        const int input_vals[3][2] = {
                {0x0c, 0},
                {0x0d, 0},
                {0x0e, 1}
        };

        if (input > 2)
                return -EINVAL;

        v4l2_dbg(1, debug, sd, "input switched to %s\n", inputs[input]);

        vpx3220_write(sd, 0x33, input_vals[input][0]);

        data = vpx3220_fp_read(sd, 0xf2) & ~(0x0020);
        if (data < 0)
                return data;
        /* 0x0010 is required to latch the setting */
        vpx3220_fp_write(sd, 0xf2,
                        data | (input_vals[input][1] << 5) | 0x0010);

        udelay(10);
        return 0;
}

static int vpx3220_s_stream(struct v4l2_subdev *sd, int enable)
{
        v4l2_dbg(1, debug, sd, "s_stream %s\n", enable ? "on" : "off");

        vpx3220_write(sd, 0xf2, (enable ? 0x1b : 0x00));
        return 0;
}

static int vpx3220_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct v4l2_subdev *sd = to_sd(ctrl);

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                vpx3220_write(sd, 0xe6, ctrl->val);
                return 0;
        case V4L2_CID_CONTRAST:
                /* Bit 7 and 8 is for noise shaping */
                vpx3220_write(sd, 0xe7, ctrl->val + 192);
                return 0;
        case V4L2_CID_SATURATION:
                vpx3220_fp_write(sd, 0xa0, ctrl->val);
                return 0;
        case V4L2_CID_HUE:
                vpx3220_fp_write(sd, 0x1c, ctrl->val);
                return 0;
        }
        return -EINVAL;
}

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

static const struct v4l2_ctrl_ops vpx3220_ctrl_ops = {
        .s_ctrl = vpx3220_s_ctrl,
};

static const struct v4l2_subdev_core_ops vpx3220_core_ops = {
        .init = vpx3220_init,
};

static const struct v4l2_subdev_video_ops vpx3220_video_ops = {
        .s_std = vpx3220_s_std,
        .s_routing = vpx3220_s_routing,
        .s_stream = vpx3220_s_stream,
        .querystd = vpx3220_querystd,
        .g_input_status = vpx3220_g_input_status,
};

static const struct v4l2_subdev_ops vpx3220_ops = {
        .core = &vpx3220_core_ops,
        .video = &vpx3220_video_ops,
};

/* -----------------------------------------------------------------------
 * Client management code
 */

static int vpx3220_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
{
        struct vpx3220 *decoder;
        struct v4l2_subdev *sd;
        const char *name = NULL;
        u8 ver;
        u16 pn;

        /* Check if the adapter supports the needed features */
        if (!i2c_check_functionality(client->adapter,
                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
                return -ENODEV;

        decoder = devm_kzalloc(&client->dev, sizeof(*decoder), GFP_KERNEL);
        if (decoder == NULL)
                return -ENOMEM;
        sd = &decoder->sd;
        v4l2_i2c_subdev_init(sd, client, &vpx3220_ops);
        decoder->norm = V4L2_STD_PAL;
        decoder->input = 0;
        decoder->enable = 1;
        v4l2_ctrl_handler_init(&decoder->hdl, 4);
        v4l2_ctrl_new_std(&decoder->hdl, &vpx3220_ctrl_ops,
                V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
        v4l2_ctrl_new_std(&decoder->hdl, &vpx3220_ctrl_ops,
                V4L2_CID_CONTRAST, 0, 63, 1, 32);
        v4l2_ctrl_new_std(&decoder->hdl, &vpx3220_ctrl_ops,
                V4L2_CID_SATURATION, 0, 4095, 1, 2048);
        v4l2_ctrl_new_std(&decoder->hdl, &vpx3220_ctrl_ops,
                V4L2_CID_HUE, -512, 511, 1, 0);
        sd->ctrl_handler = &decoder->hdl;
        if (decoder->hdl.error) {
                int err = decoder->hdl.error;

                v4l2_ctrl_handler_free(&decoder->hdl);
                return err;
        }
        v4l2_ctrl_handler_setup(&decoder->hdl);

        ver = i2c_smbus_read_byte_data(client, 0x00);
        pn = (i2c_smbus_read_byte_data(client, 0x02) << 8) +
                i2c_smbus_read_byte_data(client, 0x01);
        if (ver == 0xec) {
                switch (pn) {
                case 0x4680:
                        name = "vpx3220a";
                        break;
                case 0x4260:
                        name = "vpx3216b";
                        break;
                case 0x4280:
                        name = "vpx3214c";
                        break;
                }
        }
        if (name)
                v4l2_info(sd, "%s found @ 0x%x (%s)\n", name,
                        client->addr << 1, client->adapter->name);
        else
                v4l2_info(sd, "chip (%02x:%04x) found @ 0x%x (%s)\n",
                        ver, pn, client->addr << 1, client->adapter->name);

        vpx3220_write_block(sd, init_common, sizeof(init_common));
        vpx3220_write_fp_block(sd, init_fp, sizeof(init_fp) >> 1);
        /* Default to PAL */
        vpx3220_write_fp_block(sd, init_pal, sizeof(init_pal) >> 1);
        return 0;
}

static int vpx3220_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct vpx3220 *decoder = to_vpx3220(sd);

        v4l2_device_unregister_subdev(sd);
        v4l2_ctrl_handler_free(&decoder->hdl);

        return 0;
}

static const struct i2c_device_id vpx3220_id[] = {
        { "vpx3220a", 0 },
        { "vpx3216b", 0 },
        { "vpx3214c", 0 },
        { }
};
MODULE_DEVICE_TABLE(i2c, vpx3220_id);

static struct i2c_driver vpx3220_driver = {
        .driver = {
                .name   = "vpx3220",
        },
        .probe          = vpx3220_probe,
        .remove         = vpx3220_remove,
        .id_table       = vpx3220_id,
};

module_i2c_driver(vpx3220_driver);