/*
 * Syntek DV4000 (STK014) subdriver
 *
 * Copyright (C) 2008 Jean-Francois Moine (http://moinejf.free.fr)
 *
 * 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
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "stk014"

#include "gspca.h"
#include "jpeg.h"

MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
MODULE_DESCRIPTION("Syntek DV4000 (STK014) USB Camera Driver");
MODULE_LICENSE("GPL");

#define QUALITY 50

/* specific webcam descriptor */
struct sd {
        struct gspca_dev gspca_dev;     /* !! must be the first item */
        u8 jpeg_hdr[JPEG_HDR_SZ];
};

static const struct v4l2_pix_format vga_mode[] = {
        {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
                .bytesperline = 320,
                .sizeimage = 320 * 240 * 3 / 8 + 590,
                .colorspace = V4L2_COLORSPACE_JPEG,
                .priv = 1},
        {640, 480, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
                .bytesperline = 640,
                .sizeimage = 640 * 480 * 3 / 8 + 590,
                .colorspace = V4L2_COLORSPACE_JPEG,
                .priv = 0},
};

/* -- read a register -- */
static u8 reg_r(struct gspca_dev *gspca_dev,
                        __u16 index)
{
        struct usb_device *dev = gspca_dev->dev;
        int ret;

        if (gspca_dev->usb_err < 0)
                return 0;
        ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
                        0x00,
                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        0x00,
                        index,
                        gspca_dev->usb_buf, 1,
                        500);
        if (ret < 0) {
                pr_err("reg_r err %d\n", ret);
                gspca_dev->usb_err = ret;
                return 0;
        }
        return gspca_dev->usb_buf[0];
}

/* -- write a register -- */
static void reg_w(struct gspca_dev *gspca_dev,
                        __u16 index, __u16 value)
{
        struct usb_device *dev = gspca_dev->dev;
        int ret;

        if (gspca_dev->usb_err < 0)
                return;
        ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
                        0x01,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        value,
                        index,
                        NULL,
                        0,
                        500);
        if (ret < 0) {
                pr_err("reg_w err %d\n", ret);
                gspca_dev->usb_err = ret;
        }
}

/* -- get a bulk value (4 bytes) -- */
static void rcv_val(struct gspca_dev *gspca_dev,
                        int ads)
{
        struct usb_device *dev = gspca_dev->dev;
        int alen, ret;

        reg_w(gspca_dev, 0x634, (ads >> 16) & 0xff);
        reg_w(gspca_dev, 0x635, (ads >> 8) & 0xff);
        reg_w(gspca_dev, 0x636, ads & 0xff);
        reg_w(gspca_dev, 0x637, 0);
        reg_w(gspca_dev, 0x638, 4);     /* len & 0xff */
        reg_w(gspca_dev, 0x639, 0);     /* len >> 8 */
        reg_w(gspca_dev, 0x63a, 0);
        reg_w(gspca_dev, 0x63b, 0);
        reg_w(gspca_dev, 0x630, 5);
        if (gspca_dev->usb_err < 0)
                return;
        ret = usb_bulk_msg(dev,
                        usb_rcvbulkpipe(dev, 0x05),
                        gspca_dev->usb_buf,
                        4,              /* length */
                        &alen,
                        500);           /* timeout in milliseconds */
        if (ret < 0) {
                pr_err("rcv_val err %d\n", ret);
                gspca_dev->usb_err = ret;
        }
}

/* -- send a bulk value -- */
static void snd_val(struct gspca_dev *gspca_dev,
                        int ads,
                        unsigned int val)
{
        struct usb_device *dev = gspca_dev->dev;
        int alen, ret;
        __u8 seq = 0;

        if (ads == 0x003f08) {
                reg_r(gspca_dev, 0x0704);
                seq = reg_r(gspca_dev, 0x0705);
                reg_r(gspca_dev, 0x0650);
                reg_w(gspca_dev, 0x654, seq);
        } else {
                reg_w(gspca_dev, 0x654, (ads >> 16) & 0xff);
        }
        reg_w(gspca_dev, 0x655, (ads >> 8) & 0xff);
        reg_w(gspca_dev, 0x656, ads & 0xff);
        reg_w(gspca_dev, 0x657, 0);
        reg_w(gspca_dev, 0x658, 0x04);  /* size */
        reg_w(gspca_dev, 0x659, 0);
        reg_w(gspca_dev, 0x65a, 0);
        reg_w(gspca_dev, 0x65b, 0);
        reg_w(gspca_dev, 0x650, 5);
        if (gspca_dev->usb_err < 0)
                return;
        gspca_dev->usb_buf[0] = val >> 24;
        gspca_dev->usb_buf[1] = val >> 16;
        gspca_dev->usb_buf[2] = val >> 8;
        gspca_dev->usb_buf[3] = val;
        ret = usb_bulk_msg(dev,
                        usb_sndbulkpipe(dev, 6),
                        gspca_dev->usb_buf,
                        4,
                        &alen,
                        500);   /* timeout in milliseconds */
        if (ret < 0) {
                pr_err("snd_val err %d\n", ret);
                gspca_dev->usb_err = ret;
        } else {
                if (ads == 0x003f08) {
                        seq += 4;
                        seq &= 0x3f;
                        reg_w(gspca_dev, 0x705, seq);
                }
        }
}

/* set a camera parameter */
static void set_par(struct gspca_dev *gspca_dev,
                   int parval)
{
        snd_val(gspca_dev, 0x003f08, parval);
}

static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
{
        int parval;

        parval = 0x06000000             /* whiteness */
                + (val << 16);
        set_par(gspca_dev, parval);
}

static void setcontrast(struct gspca_dev *gspca_dev, s32 val)
{
        int parval;

        parval = 0x07000000             /* contrast */
                + (val << 16);
        set_par(gspca_dev, parval);
}

static void setcolors(struct gspca_dev *gspca_dev, s32 val)
{
        int parval;

        parval = 0x08000000             /* saturation */
                + (val << 16);
        set_par(gspca_dev, parval);
}

static void setlightfreq(struct gspca_dev *gspca_dev, s32 val)
{
        set_par(gspca_dev, val == 1
                        ? 0x33640000            /* 50 Hz */
                        : 0x33780000);          /* 60 Hz */
}

/* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
                        const struct usb_device_id *id)
{
        gspca_dev->cam.cam_mode = vga_mode;
        gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
        return 0;
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
        u8 ret;

        /* check if the device responds */
        usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);
        ret = reg_r(gspca_dev, 0x0740);
        if (gspca_dev->usb_err >= 0) {
                if (ret != 0xff) {
                        pr_err("init reg: 0x%02x\n", ret);
                        gspca_dev->usb_err = -EIO;
                }
        }
        return gspca_dev->usb_err;
}

/* -- start the camera -- */
static int sd_start(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *) gspca_dev;
        int ret, value;

        /* create the JPEG header */
        jpeg_define(sd->jpeg_hdr, gspca_dev->height, gspca_dev->width,
                        0x22);          /* JPEG 411 */
        jpeg_set_qual(sd->jpeg_hdr, QUALITY);

        /* work on alternate 1 */
        usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);

        set_par(gspca_dev, 0x10000000);
        set_par(gspca_dev, 0x00000000);
        set_par(gspca_dev, 0x8002e001);
        set_par(gspca_dev, 0x14000000);
        if (gspca_dev->width > 320)
                value = 0x8002e001;             /* 640x480 */
        else
                value = 0x4001f000;             /* 320x240 */
        set_par(gspca_dev, value);
        ret = usb_set_interface(gspca_dev->dev,
                                        gspca_dev->iface,
                                        gspca_dev->alt);
        if (ret < 0) {
                pr_err("set intf %d %d failed\n",
                       gspca_dev->iface, gspca_dev->alt);
                gspca_dev->usb_err = ret;
                goto out;
        }
         reg_r(gspca_dev, 0x0630);
        rcv_val(gspca_dev, 0x000020);   /* << (value ff ff ff ff) */
        reg_r(gspca_dev, 0x0650);
        snd_val(gspca_dev, 0x000020, 0xffffffff);
        reg_w(gspca_dev, 0x0620, 0);
        reg_w(gspca_dev, 0x0630, 0);
        reg_w(gspca_dev, 0x0640, 0);
        reg_w(gspca_dev, 0x0650, 0);
        reg_w(gspca_dev, 0x0660, 0);
        set_par(gspca_dev, 0x09800000);         /* Red ? */
        set_par(gspca_dev, 0x0a800000);         /* Green ? */
        set_par(gspca_dev, 0x0b800000);         /* Blue ? */
        set_par(gspca_dev, 0x0d030000);         /* Gamma ? */

        /* start the video flow */
        set_par(gspca_dev, 0x01000000);
        set_par(gspca_dev, 0x01000000);
        if (gspca_dev->usb_err >= 0)
                PDEBUG(D_STREAM, "camera started alt: 0x%02x",
                                gspca_dev->alt);
out:
        return gspca_dev->usb_err;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
        struct usb_device *dev = gspca_dev->dev;

        set_par(gspca_dev, 0x02000000);
        set_par(gspca_dev, 0x02000000);
        usb_set_interface(dev, gspca_dev->iface, 1);
        reg_r(gspca_dev, 0x0630);
        rcv_val(gspca_dev, 0x000020);   /* << (value ff ff ff ff) */
        reg_r(gspca_dev, 0x0650);
        snd_val(gspca_dev, 0x000020, 0xffffffff);
        reg_w(gspca_dev, 0x0620, 0);
        reg_w(gspca_dev, 0x0630, 0);
        reg_w(gspca_dev, 0x0640, 0);
        reg_w(gspca_dev, 0x0650, 0);
        reg_w(gspca_dev, 0x0660, 0);
        PDEBUG(D_STREAM, "camera stopped");
}

static void sd_pkt_scan(struct gspca_dev *gspca_dev,
                        u8 *data,                       /* isoc packet */
                        int len)                        /* iso packet length */
{
        struct sd *sd = (struct sd *) gspca_dev;
        static unsigned char ffd9[] = {0xff, 0xd9};

        /* a frame starts with:
         *      - 0xff 0xfe
         *      - 0x08 0x00     - length (little endian ?!)
         *      - 4 bytes = size of whole frame (BE - including header)
         *      - 0x00 0x0c
         *      - 0xff 0xd8
         *      - ..    JPEG image with escape sequences (ff 00)
         *              (without ending - ff d9)
         */
        if (data[0] == 0xff && data[1] == 0xfe) {
                gspca_frame_add(gspca_dev, LAST_PACKET,
                                ffd9, 2);

                /* put the JPEG 411 header */
                gspca_frame_add(gspca_dev, FIRST_PACKET,
                        sd->jpeg_hdr, JPEG_HDR_SZ);

                /* beginning of the frame */
#define STKHDRSZ 12
                data += STKHDRSZ;
                len -= STKHDRSZ;
        }
        gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
}

static int sd_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct gspca_dev *gspca_dev =
                container_of(ctrl->handler, struct gspca_dev, ctrl_handler);

        gspca_dev->usb_err = 0;

        if (!gspca_dev->streaming)
                return 0;

        switch (ctrl->id) {
        case V4L2_CID_BRIGHTNESS:
                setbrightness(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_CONTRAST:
                setcontrast(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                setcolors(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_POWER_LINE_FREQUENCY:
                setlightfreq(gspca_dev, ctrl->val);
                break;
        }
        return gspca_dev->usb_err;
}

static const struct v4l2_ctrl_ops sd_ctrl_ops = {
        .s_ctrl = sd_s_ctrl,
};

static int sd_init_controls(struct gspca_dev *gspca_dev)
{
        struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

        gspca_dev->vdev.ctrl_handler = hdl;
        v4l2_ctrl_handler_init(hdl, 4);
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_CONTRAST, 0, 255, 1, 127);
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_SATURATION, 0, 255, 1, 127);
        v4l2_ctrl_new_std_menu(hdl, &sd_ctrl_ops,
                        V4L2_CID_POWER_LINE_FREQUENCY,
                        V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 1,
                        V4L2_CID_POWER_LINE_FREQUENCY_50HZ);

        if (hdl->error) {
                pr_err("Could not initialize controls\n");
                return hdl->error;
        }
        return 0;
}

/* sub-driver description */
static const struct sd_desc sd_desc = {
        .name = MODULE_NAME,
        .config = sd_config,
        .init = sd_init,
        .init_controls = sd_init_controls,
        .start = sd_start,
        .stopN = sd_stopN,
        .pkt_scan = sd_pkt_scan,
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
        {USB_DEVICE(0x05e1, 0x0893)},
        {}
};
MODULE_DEVICE_TABLE(usb, device_table);

/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
                        const struct usb_device_id *id)
{
        return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
                                THIS_MODULE);
}

static struct usb_driver sd_driver = {
        .name = MODULE_NAME,
        .id_table = device_table,
        .probe = sd_probe,
        .disconnect = gspca_disconnect,
#ifdef CONFIG_PM
        .suspend = gspca_suspend,
        .resume = gspca_resume,
        .reset_resume = gspca_resume,
#endif
};

module_usb_driver(sd_driver);