/* Driver for Philips webcam
   Functions that send various control messages to the webcam, including
   video modes.
   (C) 1999-2003 Nemosoft Unv. (webcam@smcc.demon.nl)

   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
*/

/*
   Changes
   2001/08/03  Alvarado   Added methods for changing white balance and 
                          red/green gains
 */

/* Control functions for the cam; brightness, contrast, video mode, etc. */

#ifdef __KERNEL__
#include <asm/uaccess.h> 
#endif
#include <asm/errno.h>
 
#include "pwc.h"
#include "pwc-ioctl.h"
#include "pwc-uncompress.h"

/* Request types: video */
#define SET_LUM_CTL                     0x01
#define GET_LUM_CTL                     0x02
#define SET_CHROM_CTL                   0x03
#define GET_CHROM_CTL                   0x04
#define SET_STATUS_CTL                  0x05
#define GET_STATUS_CTL                  0x06
#define SET_EP_STREAM_CTL               0x07
#define GET_EP_STREAM_CTL               0x08

/* Selectors for the Luminance controls [GS]ET_LUM_CTL */
#define AGC_MODE_FORMATTER                      0x2000
#define PRESET_AGC_FORMATTER                    0x2100
#define SHUTTER_MODE_FORMATTER                  0x2200
#define PRESET_SHUTTER_FORMATTER                0x2300
#define PRESET_CONTOUR_FORMATTER                0x2400
#define AUTO_CONTOUR_FORMATTER                  0x2500
#define BACK_LIGHT_COMPENSATION_FORMATTER       0x2600
#define CONTRAST_FORMATTER                      0x2700
#define DYNAMIC_NOISE_CONTROL_FORMATTER         0x2800
#define FLICKERLESS_MODE_FORMATTER              0x2900
#define AE_CONTROL_SPEED                        0x2A00
#define BRIGHTNESS_FORMATTER                    0x2B00
#define GAMMA_FORMATTER                         0x2C00

/* Selectors for the Chrominance controls [GS]ET_CHROM_CTL */
#define WB_MODE_FORMATTER                       0x1000
#define AWB_CONTROL_SPEED_FORMATTER             0x1100
#define AWB_CONTROL_DELAY_FORMATTER             0x1200
#define PRESET_MANUAL_RED_GAIN_FORMATTER        0x1300
#define PRESET_MANUAL_BLUE_GAIN_FORMATTER       0x1400
#define COLOUR_MODE_FORMATTER                   0x1500
#define SATURATION_MODE_FORMATTER1              0x1600
#define SATURATION_MODE_FORMATTER2              0x1700

/* Selectors for the Status controls [GS]ET_STATUS_CTL */
#define SAVE_USER_DEFAULTS_FORMATTER            0x0200
#define RESTORE_USER_DEFAULTS_FORMATTER         0x0300
#define RESTORE_FACTORY_DEFAULTS_FORMATTER      0x0400
#define READ_AGC_FORMATTER                      0x0500
#define READ_SHUTTER_FORMATTER                  0x0600
#define READ_RED_GAIN_FORMATTER                 0x0700
#define READ_BLUE_GAIN_FORMATTER                0x0800
#define SENSOR_TYPE_FORMATTER1                  0x0C00
#define READ_RAW_Y_MEAN_FORMATTER               0x3100
#define SET_POWER_SAVE_MODE_FORMATTER           0x3200
#define MIRROR_IMAGE_FORMATTER                  0x3300
#define LED_FORMATTER                           0x3400
#define SENSOR_TYPE_FORMATTER2                  0x3700

/* Formatters for the Video Endpoint controls [GS]ET_EP_STREAM_CTL */
#define VIDEO_OUTPUT_CONTROL_FORMATTER          0x0100

static char *size2name[PSZ_MAX] =
{
        "subQCIF",
        "QSIF",
        "QCIF",
        "SIF",
        "CIF",
        "VGA",
};  

/********/

/* Entries for the Nala (645/646) camera; the Nala doesn't have compression 
   preferences, so you either get compressed or non-compressed streams.
   
   An alternate value of 0 means this mode is not available at all.
 */

struct Nala_table_entry {
        char alternate;                 /* USB alternate setting */
        int compressed;                 /* Compressed yes/no */

        unsigned char mode[3];          /* precomputed mode table */
};

static struct Nala_table_entry Nala_table[PSZ_MAX][8] =
{
#include "pwc_nala.h"
};

/* This tables contains entries for the 675/680/690 (Timon) camera, with
   4 different qualities (no compression, low, medium, high).
   It lists the bandwidth requirements for said mode by its alternate interface 
   number. An alternate of 0 means that the mode is unavailable.
   
   There are 6 * 4 * 4 entries: 
     6 different resolutions subqcif, qsif, qcif, sif, cif, vga
     6 framerates: 5, 10, 15, 20, 25, 30
     4 compression modi: none, low, medium, high
     
   When an uncompressed mode is not available, the next available compressed mode 
   will be choosen (unless the decompressor is absent). Sometimes there are only
   1 or 2 compressed modes available; in that case entries are duplicated.
*/
struct Timon_table_entry 
{
        char alternate;                 /* USB alternate interface */
        unsigned short packetsize;      /* Normal packet size */
        unsigned short bandlength;      /* Bandlength when decompressing */
        unsigned char mode[13];         /* precomputed mode settings for cam */
};

static struct Timon_table_entry Timon_table[PSZ_MAX][6][4] = 
{
#include "pwc_timon.h"
};

/* Entries for the Kiara (730/740/750) camera */

struct Kiara_table_entry
{
        char alternate;                 /* USB alternate interface */
        unsigned short packetsize;      /* Normal packet size */
        unsigned short bandlength;      /* Bandlength when decompressing */
        unsigned char mode[12];         /* precomputed mode settings for cam */
};

static struct Kiara_table_entry Kiara_table[PSZ_MAX][6][4] =
{
#include "pwc_kiara.h"
};


/****************************************************************************/


#define SendControlMsg(request, value, buflen) \
        usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0), \
                request, \
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, \
                value, \
                pdev->vcinterface, \
                &buf, buflen, HZ / 2)

#define RecvControlMsg(request, value, buflen) \
        usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0), \
                request, \
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, \
                value, \
                pdev->vcinterface, \
                &buf, buflen, HZ / 2)


#if PWC_DEBUG
void pwc_hexdump(void *p, int len)
{
        int i;
        unsigned char *s;
        char buf[100], *d;
        
        s = (unsigned char *)p;
        d = buf;
        *d = '\0';
        Debug("Doing hexdump @ %p, %d bytes.\n", p, len);
        for (i = 0; i < len; i++) {
                d += sprintf(d, "%02X ", *s++);
                if ((i & 0xF) == 0xF) {
                        Debug("%s\n", buf);
                        d = buf;
                        *d = '\0';
                }
        }
        if ((i & 0xF) != 0)
                Debug("%s\n", buf);
}
#endif

static inline int send_video_command(struct usb_device *udev, int index, void *buf, int buflen)
{
        return usb_control_msg(udev,
                usb_sndctrlpipe(udev, 0),
                SET_EP_STREAM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                VIDEO_OUTPUT_CONTROL_FORMATTER,
                index,
                buf, buflen, HZ);
}



static inline int set_video_mode_Nala(struct pwc_device *pdev, int size, int frames)
{
        unsigned char buf[3];
        int ret, fps;
        struct Nala_table_entry *pEntry;
        int frames2frames[31] = 
        { /* closest match of framerate */
           0,  0,  0,  0,  4,  /*  0-4  */
           5,  5,  7,  7, 10,  /*  5-9  */
          10, 10, 12, 12, 15,  /* 10-14 */
          15, 15, 15, 20, 20,  /* 15-19 */
          20, 20, 20, 24, 24,  /* 20-24 */
          24, 24, 24, 24, 24,  /* 25-29 */
          24                   /* 30    */
        };
        int frames2table[31] = 
        { 0, 0, 0, 0, 0, /*  0-4  */
          1, 1, 1, 2, 2, /*  5-9  */
          3, 3, 4, 4, 4, /* 10-14 */
          5, 5, 5, 5, 5, /* 15-19 */
          6, 6, 6, 6, 7, /* 20-24 */
          7, 7, 7, 7, 7, /* 25-29 */
          7              /* 30    */
        };
        
        if (size < 0 || size > PSZ_CIF || frames < 4 || frames > 25)
                return -EINVAL;
        frames = frames2frames[frames];
        fps = frames2table[frames];
        pEntry = &Nala_table[size][fps];
        if (pEntry->alternate == 0)
                return -EINVAL;

        if (pEntry->compressed && pdev->decompressor == NULL)
                return -ENOENT; /* Not supported. */

        memcpy(buf, pEntry->mode, 3);   
        ret = send_video_command(pdev->udev, pdev->vendpoint, buf, 3);
        if (ret < 0) {
                Debug("Failed to send video command... %d\n", ret);
                return ret;
        }
        if (pEntry->compressed && pdev->decompressor != NULL)
                pdev->decompressor->init(pdev->release, buf, pdev->decompress_data);
                
        /* Set various parameters */
        pdev->vframes = frames;
        pdev->vsize = size;
        pdev->valternate = pEntry->alternate;
        pdev->image = pwc_image_sizes[size];
        pdev->frame_size = (pdev->image.x * pdev->image.y * 3) / 2;
        if (pEntry->compressed) {
                if (pdev->release < 5) { /* 4 fold compression */
                        pdev->vbandlength = 528;
                        pdev->frame_size /= 4;
                }
                else {
                        pdev->vbandlength = 704;
                        pdev->frame_size /= 3;
                }
        }
        else
                pdev->vbandlength = 0;
        return 0;
}


static inline int set_video_mode_Timon(struct pwc_device *pdev, int size, int frames, int compression, int snapshot)
{
        unsigned char buf[13];
        struct Timon_table_entry *pChoose;
        int ret, fps;

        if (size >= PSZ_MAX || frames < 5 || frames > 30 || compression < 0 || compression > 3)
                return -EINVAL;
        if (size == PSZ_VGA && frames > 15)
                return -EINVAL;
        fps = (frames / 5) - 1;
        
        /* Find a supported framerate with progressively higher compression ratios
           if the preferred ratio is not available.
        */
        pChoose = NULL;
        if (pdev->decompressor == NULL) {
#if PWC_DEBUG   
                Debug("Trying to find uncompressed mode.\n");
#endif
                pChoose = &Timon_table[size][fps][0];
        }
        else {
                while (compression <= 3) {
                        pChoose = &Timon_table[size][fps][compression];
                        if (pChoose->alternate != 0)
                                break;
                        compression++;  
                }
        }
        if (pChoose == NULL || pChoose->alternate == 0)
                return -ENOENT; /* Not supported. */

        memcpy(buf, pChoose->mode, 13);
        if (snapshot)
                buf[0] |= 0x80;
        ret = send_video_command(pdev->udev, pdev->vendpoint, buf, 13);
        if (ret < 0)
                return ret;

        if (pChoose->bandlength > 0)
                pdev->decompressor->init(pdev->release, buf, pdev->decompress_data);
        
        /* Set various parameters */
        pdev->vframes = frames;
        pdev->vsize = size;
        pdev->vsnapshot = snapshot;
        pdev->valternate = pChoose->alternate;
        pdev->image = pwc_image_sizes[size];
        pdev->vbandlength = pChoose->bandlength;
        if (pChoose->bandlength > 0) 
                pdev->frame_size = (pChoose->bandlength * pdev->image.y) / 4;
        else
                pdev->frame_size = (pdev->image.x * pdev->image.y * 12) / 8;
        return 0;
}


static inline int set_video_mode_Kiara(struct pwc_device *pdev, int size, int frames, int compression, int snapshot)
{
        struct Kiara_table_entry *pChoose;
        int fps, ret;
        unsigned char buf[12];
        
        if (size >= PSZ_MAX || frames < 5 || frames > 30 || compression < 0 || compression > 3)
                return -EINVAL;
        if (size == PSZ_VGA && frames > 15)
                return -EINVAL;
        fps = (frames / 5) - 1;
        
        /* Find a supported framerate with progressively higher compression ratios
           if the preferred ratio is not available.
        */
        pChoose = NULL;
        if (pdev->decompressor == NULL) {
#if PWC_DEBUG   
                Debug("Trying to find uncompressed mode.\n");
#endif          
                pChoose = &Kiara_table[size][fps][0];
        }
        else {
                while (compression <= 3) {
                        pChoose = &Kiara_table[size][fps][compression];
                        if (pChoose->alternate != 0)
                                break;
                        compression++;  
                }
        }
        if (pChoose == NULL || pChoose->alternate == 0)
                return -ENOENT; /* Not supported. */

        /* usb_control_msg won't take staticly allocated arrays as argument?? */
        memcpy(buf, pChoose->mode, 12);
        if (snapshot)
                buf[0] |= 0x80;

        /* Firmware bug: video endpoint is 5, but commands are sent to endpoint 4 */
        ret = send_video_command(pdev->udev, 4 /* pdev->vendpoint */, buf, 12);
        if (ret < 0)
                return ret;

        if (pChoose->bandlength > 0)
                pdev->decompressor->init(pdev->release, buf, pdev->decompress_data);
                
        /* All set and go */
        pdev->vframes = frames;
        pdev->vsize = size;
        pdev->vsnapshot = snapshot;
        pdev->valternate = pChoose->alternate;
        pdev->image = pwc_image_sizes[size];
        pdev->vbandlength = pChoose->bandlength;
        if (pChoose->bandlength > 0)
                pdev->frame_size = (pChoose->bandlength * pdev->image.y) / 4;
        else 
                pdev->frame_size = (pdev->image.x * pdev->image.y * 12) / 8;
        pdev->frame_size += (pdev->frame_header_size + pdev->frame_trailer_size);
        return 0;
}


/**
   @pdev: device structure
   @width: viewport width
   @height: viewport height
   @frame: framerate, in fps
   @compression: preferred compression ratio
   @snapshot: snapshot mode or streaming
 */
int pwc_set_video_mode(struct pwc_device *pdev, int width, int height, int frames, int compression, int snapshot)
{
        int ret, size;
        
        size = pwc_decode_size(pdev, width, height);
        if (size < 0) {
                Debug("Could not find suitable size.\n");
                return -ERANGE;
        }
        ret = -EINVAL;  
        switch(pdev->type) {
        case 645:
        case 646:
                ret = set_video_mode_Nala(pdev, size, frames);
                break;

        case 675:
        case 680:
        case 690:
                ret = set_video_mode_Timon(pdev, size, frames, compression, snapshot);
                break;
                
        case 730:
        case 740:
        case 750:
                ret = set_video_mode_Kiara(pdev, size, frames, compression, snapshot);
                break;
        }
        if (ret < 0) {
                if (ret == -ENOENT)
                        Info("Video mode %s@%d fps is only supported with the decompressor module (pwcx).\n", size2name[size], frames);
                else {
                        Err("Failed to set video mode %s@%d fps; return code = %d\n", size2name[size], frames, ret);
                }
                return ret;
        }
        pdev->view.x = width;
        pdev->view.y = height;
        pwc_set_image_buffer_size(pdev);
        Trace(TRACE_SIZE, "Set viewport to %dx%d, image size is %dx%d.\n", width, height, pwc_image_sizes[size].x, pwc_image_sizes[size].y);
        return 0;
}


void pwc_set_image_buffer_size(struct pwc_device *pdev)
{
        int factor, i, filler = 0;

        /* for PALETTE_YUV420P */
        factor = 6;
        filler = 128;

        /* Set sizes in bytes */
        pdev->image.size = pdev->image.x * pdev->image.y * factor / 4;
        pdev->view.size  = pdev->view.x  * pdev->view.y  * factor / 4;

        /* Align offset, or you'll get some very weird results in
           YUV420 mode... x must be multiple of 4 (to get the Y's in 
           place), and y even (or you'll mixup U & V). This is less of a
           problem for YUV420P.
         */
        pdev->offset.x = ((pdev->view.x - pdev->image.x) / 2) & 0xFFFC;
        pdev->offset.y = ((pdev->view.y - pdev->image.y) / 2) & 0xFFFE;
        
        /* Fill buffers with gray or black */
        for (i = 0; i < MAX_IMAGES; i++) {
                if (pdev->image_ptr[i] != NULL)
                        memset(pdev->image_ptr[i], filler, pdev->view.size);
        }
}



/* BRIGHTNESS */

int pwc_get_brightness(struct pwc_device *pdev)
{
        char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_LUM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                BRIGHTNESS_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return buf << 9;
}

int pwc_set_brightness(struct pwc_device *pdev, int value)
{
        char buf;

        if (value < 0)
                value = 0;
        if (value > 0xffff)
                value = 0xffff;
        buf = (value >> 9) & 0x7f;
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                BRIGHTNESS_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

/* CONTRAST */

int pwc_get_contrast(struct pwc_device *pdev)
{
        char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_LUM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                CONTRAST_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return buf << 10;
}

int pwc_set_contrast(struct pwc_device *pdev, int value)
{
        char buf;

        if (value < 0)
                value = 0;
        if (value > 0xffff)
                value = 0xffff;
        buf = (value >> 10) & 0x3f;
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                CONTRAST_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

/* GAMMA */

int pwc_get_gamma(struct pwc_device *pdev)
{
        char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_LUM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                GAMMA_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return buf << 11;
}

int pwc_set_gamma(struct pwc_device *pdev, int value)
{
        char buf;

        if (value < 0)
                value = 0;
        if (value > 0xffff)
                value = 0xffff;
        buf = (value >> 11) & 0x1f;
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                GAMMA_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}


/* SATURATION */

int pwc_get_saturation(struct pwc_device *pdev)
{
        char buf;
        int ret;

        if (pdev->type < 675)
                return -1;
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_CHROM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                pdev->type < 730 ? SATURATION_MODE_FORMATTER2 : SATURATION_MODE_FORMATTER1,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return 32768 + buf * 327;
}

int pwc_set_saturation(struct pwc_device *pdev, int value)
{
        char buf;

        if (pdev->type < 675)
                return -EINVAL;
        if (value < 0)
                value = 0;
        if (value > 0xffff)
                value = 0xffff;
        /* saturation ranges from -100 to +100 */
        buf = (value - 32768) / 327;
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_CHROM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                pdev->type < 730 ? SATURATION_MODE_FORMATTER2 : SATURATION_MODE_FORMATTER1,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

/* AGC */

static inline int pwc_set_agc(struct pwc_device *pdev, int mode, int value)
{
        char buf;
        int ret;
        
        if (mode)
                buf = 0x0; /* auto */
        else
                buf = 0xff; /* fixed */

        ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AGC_MODE_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        
        if (!mode && ret >= 0) {
                if (value < 0)
                        value = 0;
                if (value > 0xffff)
                        value = 0xffff;
                buf = (value >> 10) & 0x3F;
                ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                        SET_LUM_CTL,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        PRESET_AGC_FORMATTER,
                        pdev->vcinterface,
                        &buf, 1, HZ / 2);
        }
        if (ret < 0)
                return ret;
        return 0;
}

static inline int pwc_get_agc(struct pwc_device *pdev, int *value)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_LUM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AGC_MODE_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;

        if (buf != 0) { /* fixed */
                ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                        GET_LUM_CTL,
                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        PRESET_AGC_FORMATTER,
                        pdev->vcinterface,
                        &buf, 1, HZ / 2);
                if (ret < 0)
                        return ret;
                if (buf > 0x3F)
                        buf = 0x3F;
                *value = (buf << 10);           
        }
        else { /* auto */
                ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                        GET_STATUS_CTL,
                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        READ_AGC_FORMATTER,
                        pdev->vcinterface,
                        &buf, 1, HZ / 2);
                if (ret < 0)
                        return ret;
                /* Gah... this value ranges from 0x00 ... 0x9F */
                if (buf > 0x9F)
                        buf = 0x9F;
                *value = -(48 + buf * 409);
        }

        return 0;
}

static inline int pwc_set_shutter_speed(struct pwc_device *pdev, int mode, int value)
{
        char buf[2];
        int speed, ret;


        if (mode)
                buf[0] = 0x0;   /* auto */
        else
                buf[0] = 0xff; /* fixed */
        
        ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                SHUTTER_MODE_FORMATTER,
                pdev->vcinterface,
                buf, 1, HZ / 2);

        if (!mode && ret >= 0) {
                if (value < 0)
                        value = 0;
                if (value > 0xffff)
                        value = 0xffff;
                switch(pdev->type) {
                case 675:
                case 680:
                case 690:
                        /* speed ranges from 0x0 to 0x290 (656) */
                        speed = (value / 100);
                        buf[1] = speed >> 8;
                        buf[0] = speed & 0xff;
                        break;
                case 730:
                case 740:
                case 750:
                        /* speed seems to range from 0x0 to 0xff */
                        buf[1] = 0;
                        buf[0] = value >> 8;
                        break;
                }

                ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                        SET_LUM_CTL,
                        USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        PRESET_SHUTTER_FORMATTER,
                        pdev->vcinterface,
                        &buf, 2, HZ / 2);
        }
        return ret;
}       


/* POWER */

int pwc_camera_power(struct pwc_device *pdev, int power)
{
        char buf;

        if (pdev->type < 675 || (pdev->type < 730 && pdev->release < 6))
                return 0;       /* Not supported by Nala or Timon < release 6 */

        if (power)
                buf = 0x00; /* active */
        else
                buf = 0xFF; /* power save */
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_STATUS_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                SET_POWER_SAVE_MODE_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}



/* private calls */

static inline int pwc_restore_user(struct pwc_device *pdev)
{
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_STATUS_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                RESTORE_USER_DEFAULTS_FORMATTER,
                pdev->vcinterface,
                NULL, 0, HZ / 2);
}

static inline int pwc_save_user(struct pwc_device *pdev)
{
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_STATUS_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                SAVE_USER_DEFAULTS_FORMATTER,
                pdev->vcinterface,
                NULL, 0, HZ / 2);
}

static inline int pwc_restore_factory(struct pwc_device *pdev)
{
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_STATUS_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                RESTORE_FACTORY_DEFAULTS_FORMATTER,
                pdev->vcinterface,
                NULL, 0, HZ / 2);
}

 /* ************************************************* */
 /* Patch by Alvarado: (not in the original version   */

 /*
  * the camera recognizes modes from 0 to 4:
  *
  * 00: indoor (incandescant lighting)
  * 01: outdoor (sunlight)
  * 02: fluorescent lighting
  * 03: manual
  * 04: auto
  */ 
static inline int pwc_set_awb(struct pwc_device *pdev, int mode)
{
        char buf;
        int ret;
        
        if (mode < 0)
            mode = 0;
        
        if (mode > 4)
            mode = 4;
        
        buf = mode & 0x07; /* just the lowest three bits */
        
        ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_CHROM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                WB_MODE_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        
        if (ret < 0)
                return ret;
        return 0;
}

static inline int pwc_get_awb(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_CHROM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                WB_MODE_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);

        if (ret < 0) 
                return ret;
        return buf;
}

static inline int pwc_set_red_gain(struct pwc_device *pdev, int value)
{
        unsigned char buf;

        if (value < 0)
                value = 0;
        if (value > 0xffff)
                value = 0xffff;

        /* only the msb are considered */
        buf = value >> 8;

        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_CHROM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                PRESET_MANUAL_RED_GAIN_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

static inline int pwc_get_red_gain(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_CHROM_CTL, 
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                PRESET_MANUAL_RED_GAIN_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);

        if (ret < 0)
            return ret;
        
        return (buf << 8);
}


static inline int pwc_set_blue_gain(struct pwc_device *pdev, int value)
{
        unsigned char buf;

        if (value < 0)
                value = 0;
        if (value > 0xffff)
                value = 0xffff;

        /* linear mapping of 0..0xffff to -0x80..0x7f */
        buf = (value >> 8);

        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_CHROM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                PRESET_MANUAL_BLUE_GAIN_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

static inline int pwc_get_blue_gain(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_CHROM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                PRESET_MANUAL_BLUE_GAIN_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);

        if (ret < 0)
            return ret;
        
        return (buf << 8);
}


/* The following two functions are different, since they only read the
   internal red/blue gains, which may be different from the manual 
   gains set or read above.
 */   
static inline int pwc_read_red_gain(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_STATUS_CTL, 
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                READ_RED_GAIN_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);

        if (ret < 0)
                return ret;
        
        return (buf << 8);
}

static inline int pwc_read_blue_gain(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_STATUS_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                READ_BLUE_GAIN_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);

        if (ret < 0)
                return ret;
        
        return (buf << 8);
}


static inline int pwc_set_wb_speed(struct pwc_device *pdev, int speed)
{
        unsigned char buf;
        

        /* useful range is 0x01..0x20 */
        buf = speed / 0x7f0;
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_CHROM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AWB_CONTROL_SPEED_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

static inline int pwc_get_wb_speed(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_CHROM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AWB_CONTROL_SPEED_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return (buf * 0x7f0);
}


static inline int pwc_set_wb_delay(struct pwc_device *pdev, int delay)
{
        unsigned char buf;
        
        /* useful range is 0x01..0x3F */
        buf = (delay >> 10);
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_CHROM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AWB_CONTROL_DELAY_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

static inline int pwc_get_wb_delay(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_CHROM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AWB_CONTROL_DELAY_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return (buf << 10);
}


int pwc_set_leds(struct pwc_device *pdev, int on_value, int off_value)
{
        unsigned char buf[2];

        if (pdev->type < 730)
                return 0;
        on_value /= 100;
        off_value /= 100;
        if (on_value < 0)
                on_value = 0;
        if (on_value > 0xff)
                on_value = 0xff;
        if (off_value < 0)
                off_value = 0;
        if (off_value > 0xff)
                off_value = 0xff;

        buf[0] = on_value;
        buf[1] = off_value;

        return SendControlMsg(SET_STATUS_CTL, LED_FORMATTER, 2);
}

int pwc_get_leds(struct pwc_device *pdev, int *on_value, int *off_value)
{
        unsigned char buf[2];
        int ret;
        
        if (pdev->type < 730) {
                *on_value = -1;
                *off_value = -1;
                return 0;
        }

        ret = RecvControlMsg(GET_STATUS_CTL, LED_FORMATTER, 2);
        if (ret < 0)
                return ret;
        *on_value = buf[0] * 100;
        *off_value = buf[1] * 100;
        return 0;
}

static inline int pwc_set_contour(struct pwc_device *pdev, int contour)
{
        unsigned char buf;
        int ret;
        
        if (contour < 0)
                buf = 0xff; /* auto contour on */
        else
                buf = 0x0; /* auto contour off */
        ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AUTO_CONTOUR_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        
        if (contour < 0)
                return 0;
        if (contour > 0xffff)
                contour = 0xffff;
        
        buf = (contour >> 10); /* contour preset is [0..3f] */
        ret = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                PRESET_CONTOUR_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)    
                return ret;     
        return 0;
}

static inline int pwc_get_contour(struct pwc_device *pdev, int *contour)
{
        unsigned char buf;
        int ret;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_LUM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                AUTO_CONTOUR_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;

        if (buf == 0) {
                /* auto mode off, query current preset value */
                ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                        GET_LUM_CTL,
                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                        PRESET_CONTOUR_FORMATTER,
                        pdev->vcinterface,
                        &buf, 1, HZ / 2);
                if (ret < 0)    
                        return ret;
                *contour =  (buf << 10);
        }
        else
                *contour = -1;
        return 0;
}


static inline int pwc_set_backlight(struct pwc_device *pdev, int backlight)
{
        unsigned char buf;
        
        if (backlight)
                buf = 0xff;
        else
                buf = 0x0;
        return usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),
                SET_LUM_CTL,
                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                BACK_LIGHT_COMPENSATION_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
}

static inline int pwc_get_backlight(struct pwc_device *pdev)
{
        int ret;
        unsigned char buf;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_LUM_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                BACK_LIGHT_COMPENSATION_FORMATTER,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        return buf;
}


static inline int pwc_set_flicker(struct pwc_device *pdev, int flicker)
{
        unsigned char buf;
        
        if (flicker)
                buf = 0xff;
        else
                buf = 0x0;
        return SendControlMsg(SET_LUM_CTL, FLICKERLESS_MODE_FORMATTER, 1);
}

static inline int pwc_get_flicker(struct pwc_device *pdev)
{
        int ret;
        unsigned char buf;
        
        ret = RecvControlMsg(GET_LUM_CTL, FLICKERLESS_MODE_FORMATTER, 1);
        if (ret < 0)
                return ret;
        return buf;
}


static inline int pwc_set_dynamic_noise(struct pwc_device *pdev, int noise)
{
        unsigned char buf;

        if (noise < 0)
                noise = 0;
        if (noise > 3)
                noise = 3;
        buf = noise;
        return SendControlMsg(SET_LUM_CTL, DYNAMIC_NOISE_CONTROL_FORMATTER, 1);
}

static inline int pwc_get_dynamic_noise(struct pwc_device *pdev)
{
        int ret;
        unsigned char buf;
        
        ret = RecvControlMsg(GET_LUM_CTL, DYNAMIC_NOISE_CONTROL_FORMATTER, 1);
        if (ret < 0)
                return ret;
        return buf;
}


int pwc_get_cmos_sensor(struct pwc_device *pdev)
{
        unsigned char buf;
        int ret = -1, request;
        
        if (pdev->type < 675)
                request = SENSOR_TYPE_FORMATTER1;
        else if (pdev->type < 730)
                return -1; /* The Vesta series doesn't have this call */
        else
                request = SENSOR_TYPE_FORMATTER2;
        
        ret = usb_control_msg(pdev->udev, usb_rcvctrlpipe(pdev->udev, 0),
                GET_STATUS_CTL,
                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                request,
                pdev->vcinterface,
                &buf, 1, HZ / 2);
        if (ret < 0)
                return ret;
        if (pdev->type < 675)
                return buf | 0x100;
        else
                return buf;
}


 /* End of Add-Ons                                    */
 /* ************************************************* */

int pwc_ioctl(struct pwc_device *pdev, unsigned int cmd, void *arg)
{
        int ret = 0;

        switch(cmd) {
        case VIDIOCPWCRUSER:
        {
                if (pwc_restore_user(pdev))
                        ret = -EINVAL;
                break;
        }
        
        case VIDIOCPWCSUSER:
        {
                if (pwc_save_user(pdev))
                        ret = -EINVAL;
                break;
        }
                
        case VIDIOCPWCFACTORY:
        {
                if (pwc_restore_factory(pdev))
                        ret = -EINVAL;
                break;
        }
        
        case VIDIOCPWCSCQUAL:
        {       
                int qual;

                if (copy_from_user(&qual, arg, sizeof(int)))
                        ret = -EFAULT;
                else {
                        if (qual < 0 || qual > 3)
                                ret = -EINVAL;
                        else
                                ret = pwc_try_video_mode(pdev, pdev->view.x, pdev->view.y, pdev->vframes, qual, pdev->vsnapshot);
                        if (ret >= 0)
                                pdev->vcompression = qual;
                }
                break;
        }
        
        case VIDIOCPWCGCQUAL:
        {
                if (copy_to_user(arg, &pdev->vcompression, sizeof(int)))
                        ret = -EFAULT;
                break;
        }

        case VIDIOCPWCPROBE:
        {
                struct pwc_probe probe;
                
                strcpy(probe.name, pdev->vdev.name);
                probe.type = pdev->type;
                if (copy_to_user(arg, &probe, sizeof(probe)))
                        ret = -EFAULT;
                break;
        }

        case VIDIOCPWCSAGC:
        {
                int agc;
                
                if (copy_from_user(&agc, arg, sizeof(agc)))
                        ret = -EFAULT;  
                else {
                        if (pwc_set_agc(pdev, agc < 0 ? 1 : 0, agc))
                                ret = -EINVAL;
                }
                break;
        }
        
        case VIDIOCPWCGAGC:
        {
                int agc;
                
                if (pwc_get_agc(pdev, &agc))
                        ret = -EINVAL;
                else
                        if (copy_to_user(arg, &agc, sizeof(agc)))
                                ret = -EFAULT;
                break;
        }
        
        case VIDIOCPWCSSHUTTER:
        {
                int shutter_speed;

                if (copy_from_user(&shutter_speed, arg, sizeof(shutter_speed)))
                        ret = -EFAULT;
                else
                        ret = pwc_set_shutter_speed(pdev, shutter_speed < 0 ? 1 : 0, shutter_speed);
                break;
        }
        
        case VIDIOCPWCSAWB:
        {
                struct pwc_whitebalance wb;
                
                if (copy_from_user(&wb, arg, sizeof(wb)))
                        ret = -EFAULT;
                else {
                        ret = pwc_set_awb(pdev, wb.mode);
                        if (ret >= 0 && wb.mode == PWC_WB_MANUAL) {
                                pwc_set_red_gain(pdev, wb.manual_red);
                                pwc_set_blue_gain(pdev, wb.manual_blue);
                        }
                }
                break;
        }

        case VIDIOCPWCGAWB:
        {
                struct pwc_whitebalance wb;
                
                memset(&wb, 0, sizeof(wb));
                wb.mode = pwc_get_awb(pdev);
                if (wb.mode < 0)
                        ret = -EINVAL;
                else {
                        if (wb.mode == PWC_WB_MANUAL) {
                                wb.manual_red = pwc_get_red_gain(pdev);
                                wb.manual_blue = pwc_get_blue_gain(pdev);
                        }
                        if (wb.mode == PWC_WB_AUTO) {
                                wb.read_red = pwc_read_red_gain(pdev);
                                wb.read_blue = pwc_read_blue_gain(pdev);
                        }
                        if (copy_to_user(arg, &wb, sizeof(wb)))
                                ret= -EFAULT;
                }
                break;
        }
        
        case VIDIOCPWCSAWBSPEED:
        {
                struct pwc_wb_speed wbs;
                
                if (copy_from_user(&wbs, arg, sizeof(wbs)))
                        ret = -EFAULT;
                else {
                        if (wbs.control_speed > 0) {
                                ret = pwc_set_wb_speed(pdev, wbs.control_speed);
                        }
                        if (wbs.control_delay > 0) {
                                ret = pwc_set_wb_delay(pdev, wbs.control_delay);
                        }
                }
                break;
        }
        
        case VIDIOCPWCGAWBSPEED:
        {
                struct pwc_wb_speed wbs;
                
                ret = pwc_get_wb_speed(pdev);
                if (ret < 0)
                        break;
                wbs.control_speed = ret;
                ret = pwc_get_wb_delay(pdev);
                if (ret < 0)
                        break;
                wbs.control_delay = ret;
                if (copy_to_user(arg, &wbs, sizeof(wbs)))
                        ret = -EFAULT;
                break;
        }

        case VIDIOCPWCSLED:
        {
                struct pwc_leds leds;

                if (copy_from_user(&leds, arg, sizeof(leds)))
                        ret = -EFAULT;
                else
                        ret = pwc_set_leds(pdev, leds.led_on, leds.led_off);
                break;
        }


        case VIDIOCPWCGLED:
        {
                struct pwc_leds leds;
                
                ret = pwc_get_leds(pdev, &leds.led_on, &leds.led_off); 
                if (ret < 0)
                        break;
                if (copy_to_user(arg, &leds, sizeof(leds)))
                        ret = -EFAULT;
                break;
        }

        case VIDIOCPWCSCONTOUR:
        {
                int contour;
                
                if (copy_from_user(&contour, arg, sizeof(contour)))
                        ret = -EFAULT;
                else
                        ret = pwc_set_contour(pdev, contour);
                break;
        }
                        
        case VIDIOCPWCGCONTOUR:
        {
                int contour;
                
                ret = pwc_get_contour(pdev, &contour);
                if (ret < 0)
                        break;
                        
                if (copy_to_user(arg, &contour, sizeof(contour)))
                        ret = -EFAULT;
                break;
        }
        
        case VIDIOCPWCSBACKLIGHT:
        {
                int backlight;
                
                if (copy_from_user(&backlight, arg, sizeof(backlight)))
                        ret = -EFAULT;
                else
                        ret = pwc_set_backlight(pdev, backlight);
                break;
        }

        case VIDIOCPWCGBACKLIGHT:
        {
                ret = pwc_get_backlight(pdev);
                if (ret < 0)
                        break;
                if (copy_to_user(arg, &ret, sizeof(ret)))
                        ret = -EFAULT;
                break;
        }
        
        case VIDIOCPWCSFLICKER:
        {
                int flicker;
                
                if (copy_from_user(&flicker, arg, sizeof(flicker)))
                        ret = -EFAULT;
                else
                        ret = pwc_set_flicker(pdev, flicker);
                break;
        }

        case VIDIOCPWCGFLICKER:
        {
                ret = pwc_get_flicker(pdev);
                if (ret < 0)
                        break;
                if (copy_to_user(arg, &ret, sizeof(ret)))
                        ret = -EFAULT;
                break;
        }
        
        case VIDIOCPWCSDYNNOISE:
        {
                int dynnoise;
                
                if (copy_from_user(&dynnoise, arg, sizeof(dynnoise)))
                        ret = -EFAULT;
                else
                        ret = pwc_set_dynamic_noise(pdev, dynnoise);
                break;
        }
        
        case VIDIOCPWCGDYNNOISE:
        {
                ret = pwc_get_dynamic_noise(pdev);
                if (ret < 0)
                        break;
                if (copy_to_user(arg, &ret, sizeof(ret)))
                        ret = -EFAULT;
                break;
        }
        
        case VIDIOCPWCGREALSIZE:
        {
                struct pwc_imagesize size;
                
                size.width = pdev->image.x;
                size.height = pdev->image.y;
                if (copy_to_user(arg, &size, sizeof(size)))
                        ret = -EFAULT;
                break;
        }       

        default:
                ret = -ENOIOCTLCMD;
                break;
        }
        
        if (ret > 0)
                return 0;
        return ret;
}