/*
 * GSPCA Endpoints (formerly known as AOX) se401 USB Camera sub Driver
 *
 * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
 *
 * Based on the v4l1 se401 driver which is:
 *
 * Copyright (c) 2000 Jeroen B. Vreeken (pe1rxq@amsat.org)
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define MODULE_NAME "se401"

#define BULK_SIZE 4096
#define PACKET_SIZE 1024
#define READ_REQ_SIZE 64
#define MAX_MODES ((READ_REQ_SIZE - 6) / 4)
/* The se401 compression algorithm uses a fixed quant factor, which
   can be configured by setting the high nibble of the SE401_OPERATINGMODE
   feature. This needs to exactly match what is in libv4l! */
#define SE401_QUANT_FACT 8

#include <linux/input.h>
#include <linux/slab.h>
#include "gspca.h"
#include "se401.h"

MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("Endpoints se401");
MODULE_LICENSE("GPL");

/* exposure change state machine states */
enum {
        EXPO_CHANGED,
        EXPO_DROP_FRAME,
        EXPO_NO_CHANGE,
};

/* specific webcam descriptor */
struct sd {
        struct gspca_dev gspca_dev;     /* !! must be the first item */
        struct { /* exposure/freq control cluster */
                struct v4l2_ctrl *exposure;
                struct v4l2_ctrl *freq;
        };
        bool has_brightness;
        struct v4l2_pix_format fmts[MAX_MODES];
        int pixels_read;
        int packet_read;
        u8 packet[PACKET_SIZE];
        u8 restart_stream;
        u8 button_state;
        u8 resetlevel;
        u8 resetlevel_frame_count;
        int resetlevel_adjust_dir;
        int expo_change_state;
};


static void se401_write_req(struct gspca_dev *gspca_dev, u16 req, u16 value,
                            int silent)
{
        int err;

        if (gspca_dev->usb_err < 0)
                return;

        err = usb_control_msg(gspca_dev->dev,
                              usb_sndctrlpipe(gspca_dev->dev, 0), req,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              value, 0, NULL, 0, 1000);
        if (err < 0) {
                if (!silent)
                        pr_err("write req failed req %#04x val %#04x error %d\n",
                               req, value, err);
                gspca_dev->usb_err = err;
        }
}

static void se401_read_req(struct gspca_dev *gspca_dev, u16 req, int silent)
{
        int err;

        if (gspca_dev->usb_err < 0)
                return;

        if (USB_BUF_SZ < READ_REQ_SIZE) {
                pr_err("USB_BUF_SZ too small!!\n");
                gspca_dev->usb_err = -ENOBUFS;
                return;
        }

        err = usb_control_msg(gspca_dev->dev,
                              usb_rcvctrlpipe(gspca_dev->dev, 0), req,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, 0, gspca_dev->usb_buf, READ_REQ_SIZE, 1000);
        if (err < 0) {
                if (!silent)
                        pr_err("read req failed req %#04x error %d\n",
                               req, err);
                gspca_dev->usb_err = err;
        }
}

static void se401_set_feature(struct gspca_dev *gspca_dev,
                              u16 selector, u16 param)
{
        int err;

        if (gspca_dev->usb_err < 0)
                return;

        err = usb_control_msg(gspca_dev->dev,
                              usb_sndctrlpipe(gspca_dev->dev, 0),
                              SE401_REQ_SET_EXT_FEATURE,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              param, selector, NULL, 0, 1000);
        if (err < 0) {
                pr_err("set feature failed sel %#04x param %#04x error %d\n",
                       selector, param, err);
                gspca_dev->usb_err = err;
        }
}

static int se401_get_feature(struct gspca_dev *gspca_dev, u16 selector)
{
        int err;

        if (gspca_dev->usb_err < 0)
                return gspca_dev->usb_err;

        if (USB_BUF_SZ < 2) {
                pr_err("USB_BUF_SZ too small!!\n");
                gspca_dev->usb_err = -ENOBUFS;
                return gspca_dev->usb_err;
        }

        err = usb_control_msg(gspca_dev->dev,
                              usb_rcvctrlpipe(gspca_dev->dev, 0),
                              SE401_REQ_GET_EXT_FEATURE,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, selector, gspca_dev->usb_buf, 2, 1000);
        if (err < 0) {
                pr_err("get feature failed sel %#04x error %d\n",
                       selector, err);
                gspca_dev->usb_err = err;
                return err;
        }
        return gspca_dev->usb_buf[0] | (gspca_dev->usb_buf[1] << 8);
}

static void setbrightness(struct gspca_dev *gspca_dev, s32 val)
{
        /* HDG: this does not seem to do anything on my cam */
        se401_write_req(gspca_dev, SE401_REQ_SET_BRT, val, 0);
}

static void setgain(struct gspca_dev *gspca_dev, s32 val)
{
        u16 gain = 63 - val;

        /* red color gain */
        se401_set_feature(gspca_dev, HV7131_REG_ARCG, gain);
        /* green color gain */
        se401_set_feature(gspca_dev, HV7131_REG_AGCG, gain);
        /* blue color gain */
        se401_set_feature(gspca_dev, HV7131_REG_ABCG, gain);
}

static void setexposure(struct gspca_dev *gspca_dev, s32 val, s32 freq)
{
        struct sd *sd = (struct sd *) gspca_dev;
        int integration = val << 6;
        u8 expose_h, expose_m, expose_l;

        /* Do this before the set_feature calls, for proper timing wrt
           the interrupt driven pkt_scan. Note we may still race but that
           is not a big issue, the expo change state machine is merely for
           avoiding underexposed frames getting send out, if one sneaks
           through so be it */
        sd->expo_change_state = EXPO_CHANGED;

        if (freq == V4L2_CID_POWER_LINE_FREQUENCY_50HZ)
                integration = integration - integration % 106667;
        if (freq == V4L2_CID_POWER_LINE_FREQUENCY_60HZ)
                integration = integration - integration % 88889;

        expose_h = (integration >> 16);
        expose_m = (integration >> 8);
        expose_l = integration;

        /* integration time low */
        se401_set_feature(gspca_dev, HV7131_REG_TITL, expose_l);
        /* integration time mid */
        se401_set_feature(gspca_dev, HV7131_REG_TITM, expose_m);
        /* integration time high */
        se401_set_feature(gspca_dev, HV7131_REG_TITU, expose_h);
}

static int sd_config(struct gspca_dev *gspca_dev,
                        const struct usb_device_id *id)
{
        struct sd *sd = (struct sd *)gspca_dev;
        struct cam *cam = &gspca_dev->cam;
        u8 *cd = gspca_dev->usb_buf;
        int i, j, n;
        int widths[MAX_MODES], heights[MAX_MODES];

        /* Read the camera descriptor */
        se401_read_req(gspca_dev, SE401_REQ_GET_CAMERA_DESCRIPTOR, 1);
        if (gspca_dev->usb_err) {
                /* Sometimes after being idle for a while the se401 won't
                   respond and needs a good kicking  */
                usb_reset_device(gspca_dev->dev);
                gspca_dev->usb_err = 0;
                se401_read_req(gspca_dev, SE401_REQ_GET_CAMERA_DESCRIPTOR, 0);
        }

        /* Some cameras start with their LED on */
        se401_write_req(gspca_dev, SE401_REQ_LED_CONTROL, 0, 0);
        if (gspca_dev->usb_err)
                return gspca_dev->usb_err;

        if (cd[1] != 0x41) {
                pr_err("Wrong descriptor type\n");
                return -ENODEV;
        }

        if (!(cd[2] & SE401_FORMAT_BAYER)) {
                pr_err("Bayer format not supported!\n");
                return -ENODEV;
        }

        if (cd[3])
                pr_info("ExtraFeatures: %d\n", cd[3]);

        n = cd[4] | (cd[5] << 8);
        if (n > MAX_MODES) {
                pr_err("Too many frame sizes\n");
                return -ENODEV;
        }

        for (i = 0; i < n ; i++) {
                widths[i] = cd[6 + i * 4 + 0] | (cd[6 + i * 4 + 1] << 8);
                heights[i] = cd[6 + i * 4 + 2] | (cd[6 + i * 4 + 3] << 8);
        }

        for (i = 0; i < n ; i++) {
                sd->fmts[i].width = widths[i];
                sd->fmts[i].height = heights[i];
                sd->fmts[i].field = V4L2_FIELD_NONE;
                sd->fmts[i].colorspace = V4L2_COLORSPACE_SRGB;
                sd->fmts[i].priv = 1;

                /* janggu compression only works for 1/4th or 1/16th res */
                for (j = 0; j < n; j++) {
                        if (widths[j] / 2 == widths[i] &&
                            heights[j] / 2 == heights[i]) {
                                sd->fmts[i].priv = 2;
                                break;
                        }
                }
                /* 1/16th if available too is better then 1/4th, because
                   we then use a larger area of the sensor */
                for (j = 0; j < n; j++) {
                        if (widths[j] / 4 == widths[i] &&
                            heights[j] / 4 == heights[i]) {
                                sd->fmts[i].priv = 4;
                                break;
                        }
                }

                if (sd->fmts[i].priv == 1) {
                        /* Not a 1/4th or 1/16th res, use bayer */
                        sd->fmts[i].pixelformat = V4L2_PIX_FMT_SBGGR8;
                        sd->fmts[i].bytesperline = widths[i];
                        sd->fmts[i].sizeimage = widths[i] * heights[i];
                        pr_info("Frame size: %dx%d bayer\n",
                                widths[i], heights[i]);
                } else {
                        /* Found a match use janggu compression */
                        sd->fmts[i].pixelformat = V4L2_PIX_FMT_SE401;
                        sd->fmts[i].bytesperline = 0;
                        sd->fmts[i].sizeimage = widths[i] * heights[i] * 3;
                        pr_info("Frame size: %dx%d 1/%dth janggu\n",
                                widths[i], heights[i],
                                sd->fmts[i].priv * sd->fmts[i].priv);
                }
        }

        cam->cam_mode = sd->fmts;
        cam->nmodes = n;
        cam->bulk = 1;
        cam->bulk_size = BULK_SIZE;
        cam->bulk_nurbs = 4;
        sd->resetlevel = 0x2d; /* Set initial resetlevel */

        /* See if the camera supports brightness */
        se401_read_req(gspca_dev, SE401_REQ_GET_BRT, 1);
        sd->has_brightness = !!gspca_dev->usb_err;
        gspca_dev->usb_err = 0;

        return 0;
}

/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
        return 0;
}

/* function called at start time before URB creation */
static int sd_isoc_init(struct gspca_dev *gspca_dev)
{
        gspca_dev->alt = 1;     /* Ignore the bogus isoc alt settings */

        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 mult = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;
        int mode = 0;

        se401_write_req(gspca_dev, SE401_REQ_CAMERA_POWER, 1, 1);
        if (gspca_dev->usb_err) {
                /* Sometimes after being idle for a while the se401 won't
                   respond and needs a good kicking  */
                usb_reset_device(gspca_dev->dev);
                gspca_dev->usb_err = 0;
                se401_write_req(gspca_dev, SE401_REQ_CAMERA_POWER, 1, 0);
        }
        se401_write_req(gspca_dev, SE401_REQ_LED_CONTROL, 1, 0);

        se401_set_feature(gspca_dev, HV7131_REG_MODE_B, 0x05);

        /* set size + mode */
        se401_write_req(gspca_dev, SE401_REQ_SET_WIDTH,
                        gspca_dev->width * mult, 0);
        se401_write_req(gspca_dev, SE401_REQ_SET_HEIGHT,
                        gspca_dev->height * mult, 0);
        /*
         * HDG: disabled this as it does not seem to do anything
         * se401_write_req(gspca_dev, SE401_REQ_SET_OUTPUT_MODE,
         *                 SE401_FORMAT_BAYER, 0);
         */

        switch (mult) {
        case 1: /* Raw bayer */
                mode = 0x03; break;
        case 2: /* 1/4th janggu */
                mode = SE401_QUANT_FACT << 4; break;
        case 4: /* 1/16th janggu */
                mode = (SE401_QUANT_FACT << 4) | 0x02; break;
        }
        se401_set_feature(gspca_dev, SE401_OPERATINGMODE, mode);

        se401_set_feature(gspca_dev, HV7131_REG_ARLV, sd->resetlevel);

        sd->packet_read = 0;
        sd->pixels_read = 0;
        sd->restart_stream = 0;
        sd->resetlevel_frame_count = 0;
        sd->resetlevel_adjust_dir = 0;
        sd->expo_change_state = EXPO_NO_CHANGE;

        se401_write_req(gspca_dev, SE401_REQ_START_CONTINUOUS_CAPTURE, 0, 0);

        return gspca_dev->usb_err;
}

static void sd_stopN(struct gspca_dev *gspca_dev)
{
        se401_write_req(gspca_dev, SE401_REQ_STOP_CONTINUOUS_CAPTURE, 0, 0);
        se401_write_req(gspca_dev, SE401_REQ_LED_CONTROL, 0, 0);
        se401_write_req(gspca_dev, SE401_REQ_CAMERA_POWER, 0, 0);
}

static void sd_dq_callback(struct gspca_dev *gspca_dev)
{
        struct sd *sd = (struct sd *)gspca_dev;
        unsigned int ahrc, alrc;
        int oldreset, adjust_dir;

        /* Restart the stream if requested do so by pkt_scan */
        if (sd->restart_stream) {
                sd_stopN(gspca_dev);
                sd_start(gspca_dev);
                sd->restart_stream = 0;
        }

        /* Automatically adjust sensor reset level
           Hyundai have some really nice docs about this and other sensor
           related stuff on their homepage: www.hei.co.kr */
        sd->resetlevel_frame_count++;
        if (sd->resetlevel_frame_count < 20)
                return;

        /* For some reason this normally read-only register doesn't get reset
           to zero after reading them just once... */
        se401_get_feature(gspca_dev, HV7131_REG_HIREFNOH);
        se401_get_feature(gspca_dev, HV7131_REG_HIREFNOL);
        se401_get_feature(gspca_dev, HV7131_REG_LOREFNOH);
        se401_get_feature(gspca_dev, HV7131_REG_LOREFNOL);
        ahrc = 256*se401_get_feature(gspca_dev, HV7131_REG_HIREFNOH) +
            se401_get_feature(gspca_dev, HV7131_REG_HIREFNOL);
        alrc = 256*se401_get_feature(gspca_dev, HV7131_REG_LOREFNOH) +
            se401_get_feature(gspca_dev, HV7131_REG_LOREFNOL);

        /* Not an exact science, but it seems to work pretty well... */
        oldreset = sd->resetlevel;
        if (alrc > 10) {
                while (alrc >= 10 && sd->resetlevel < 63) {
                        sd->resetlevel++;
                        alrc /= 2;
                }
        } else if (ahrc > 20) {
                while (ahrc >= 20 && sd->resetlevel > 0) {
                        sd->resetlevel--;
                        ahrc /= 2;
                }
        }
        /* Detect ping-pong-ing and halve adjustment to avoid overshoot */
        if (sd->resetlevel > oldreset)
                adjust_dir = 1;
        else
                adjust_dir = -1;
        if (sd->resetlevel_adjust_dir &&
            sd->resetlevel_adjust_dir != adjust_dir)
                sd->resetlevel = oldreset + (sd->resetlevel - oldreset) / 2;

        if (sd->resetlevel != oldreset) {
                sd->resetlevel_adjust_dir = adjust_dir;
                se401_set_feature(gspca_dev, HV7131_REG_ARLV, sd->resetlevel);
        }

        sd->resetlevel_frame_count = 0;
}

static void sd_complete_frame(struct gspca_dev *gspca_dev, u8 *data, int len)
{
        struct sd *sd = (struct sd *)gspca_dev;

        switch (sd->expo_change_state) {
        case EXPO_CHANGED:
                /* The exposure was changed while this frame
                   was being send, so this frame is ok */
                sd->expo_change_state = EXPO_DROP_FRAME;
                break;
        case EXPO_DROP_FRAME:
                /* The exposure was changed while this frame
                   was being captured, drop it! */
                gspca_dev->last_packet_type = DISCARD_PACKET;
                sd->expo_change_state = EXPO_NO_CHANGE;
                break;
        case EXPO_NO_CHANGE:
                break;
        }
        gspca_frame_add(gspca_dev, LAST_PACKET, data, len);
}

static void sd_pkt_scan_janggu(struct gspca_dev *gspca_dev, u8 *data, int len)
{
        struct sd *sd = (struct sd *)gspca_dev;
        int imagesize = gspca_dev->width * gspca_dev->height;
        int i, plen, bits, pixels, info, count;

        if (sd->restart_stream)
                return;

        /* Sometimes a 1024 bytes garbage bulk packet is send between frames */
        if (gspca_dev->last_packet_type == LAST_PACKET && len == 1024) {
                gspca_dev->last_packet_type = DISCARD_PACKET;
                return;
        }

        i = 0;
        while (i < len) {
                /* Read header if not already be present from prev bulk pkt */
                if (sd->packet_read < 4) {
                        count = 4 - sd->packet_read;
                        if (count > len - i)
                                count = len - i;
                        memcpy(&sd->packet[sd->packet_read], &data[i], count);
                        sd->packet_read += count;
                        i += count;
                        if (sd->packet_read < 4)
                                break;
                }
                bits   = sd->packet[3] + (sd->packet[2] << 8);
                pixels = sd->packet[1] + ((sd->packet[0] & 0x3f) << 8);
                info   = (sd->packet[0] & 0xc0) >> 6;
                plen   = ((bits + 47) >> 4) << 1;
                /* Sanity checks */
                if (plen > 1024) {
                        pr_err("invalid packet len %d restarting stream\n",
                               plen);
                        goto error;
                }
                if (info == 3) {
                        pr_err("unknown frame info value restarting stream\n");
                        goto error;
                }

                /* Read (remainder of) packet contents */
                count = plen - sd->packet_read;
                if (count > len - i)
                        count = len - i;
                memcpy(&sd->packet[sd->packet_read], &data[i], count);
                sd->packet_read += count;
                i += count;
                if (sd->packet_read < plen)
                        break;

                sd->pixels_read += pixels;
                sd->packet_read = 0;

                switch (info) {
                case 0: /* Frame data */
                        gspca_frame_add(gspca_dev, INTER_PACKET, sd->packet,
                                        plen);
                        break;
                case 1: /* EOF */
                        if (sd->pixels_read != imagesize) {
                                pr_err("frame size %d expected %d\n",
                                       sd->pixels_read, imagesize);
                                goto error;
                        }
                        sd_complete_frame(gspca_dev, sd->packet, plen);
                        return; /* Discard the rest of the bulk packet !! */
                case 2: /* SOF */
                        gspca_frame_add(gspca_dev, FIRST_PACKET, sd->packet,
                                        plen);
                        sd->pixels_read = pixels;
                        break;
                }
        }
        return;

error:
        sd->restart_stream = 1;
        /* Give userspace a 0 bytes frame, so our dq callback gets
           called and it can restart the stream */
        gspca_frame_add(gspca_dev, FIRST_PACKET, NULL, 0);
        gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
}

static void sd_pkt_scan_bayer(struct gspca_dev *gspca_dev, u8 *data, int len)
{
        struct cam *cam = &gspca_dev->cam;
        int imagesize = cam->cam_mode[gspca_dev->curr_mode].sizeimage;

        if (gspca_dev->image_len == 0) {
                gspca_frame_add(gspca_dev, FIRST_PACKET, data, len);
                return;
        }

        if (gspca_dev->image_len + len >= imagesize) {
                sd_complete_frame(gspca_dev, data, len);
                return;
        }

        gspca_frame_add(gspca_dev, INTER_PACKET, data, len);
}

static void sd_pkt_scan(struct gspca_dev *gspca_dev, u8 *data, int len)
{
        int mult = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].priv;

        if (len == 0)
                return;

        if (mult == 1) /* mult == 1 means raw bayer */
                sd_pkt_scan_bayer(gspca_dev, data, len);
        else
                sd_pkt_scan_janggu(gspca_dev, data, len);
}

#if IS_ENABLED(CONFIG_INPUT)
static int sd_int_pkt_scan(struct gspca_dev *gspca_dev, u8 *data, int len)
{
        struct sd *sd = (struct sd *)gspca_dev;
        u8 state;

        if (len != 2)
                return -EINVAL;

        switch (data[0]) {
        case 0:
        case 1:
                state = data[0];
                break;
        default:
                return -EINVAL;
        }
        if (sd->button_state != state) {
                input_report_key(gspca_dev->input_dev, KEY_CAMERA, state);
                input_sync(gspca_dev->input_dev);
                sd->button_state = state;
        }

        return 0;
}
#endif

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

        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_GAIN:
                setgain(gspca_dev, ctrl->val);
                break;
        case V4L2_CID_EXPOSURE:
                setexposure(gspca_dev, ctrl->val, sd->freq->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 sd *sd = (struct sd *)gspca_dev;
        struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;

        gspca_dev->vdev.ctrl_handler = hdl;
        v4l2_ctrl_handler_init(hdl, 4);
        if (sd->has_brightness)
                v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_BRIGHTNESS, 0, 255, 1, 15);
        /* max is really 63 but > 50 is not pretty */
        v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_GAIN, 0, 50, 1, 25);
        sd->exposure = v4l2_ctrl_new_std(hdl, &sd_ctrl_ops,
                        V4L2_CID_EXPOSURE, 0, 32767, 1, 15000);
        sd->freq = v4l2_ctrl_new_std_menu(hdl, &sd_ctrl_ops,
                        V4L2_CID_POWER_LINE_FREQUENCY,
                        V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 0, 0);

        if (hdl->error) {
                pr_err("Could not initialize controls\n");
                return hdl->error;
        }
        v4l2_ctrl_cluster(2, &sd->exposure);
        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,
        .isoc_init = sd_isoc_init,
        .start = sd_start,
        .stopN = sd_stopN,
        .dq_callback = sd_dq_callback,
        .pkt_scan = sd_pkt_scan,
#if IS_ENABLED(CONFIG_INPUT)
        .int_pkt_scan = sd_int_pkt_scan,
#endif
};

/* -- module initialisation -- */
static const struct usb_device_id device_table[] = {
        {USB_DEVICE(0x03e8, 0x0004)}, /* Endpoints/Aox SE401 */
        {USB_DEVICE(0x0471, 0x030b)}, /* Philips PCVC665K */
        {USB_DEVICE(0x047d, 0x5001)}, /* Kensington 67014 */
        {USB_DEVICE(0x047d, 0x5002)}, /* Kensington 6701(5/7) */
        {USB_DEVICE(0x047d, 0x5003)}, /* Kensington 67016 */
        {}
};
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 int sd_pre_reset(struct usb_interface *intf)
{
        return 0;
}

static int sd_post_reset(struct usb_interface *intf)
{
        return 0;
}

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
        .pre_reset = sd_pre_reset,
        .post_reset = sd_post_reset,
};

module_usb_driver(sd_driver);