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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [media/] [video/] [stv680.c] - Blame information for rev 62

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/*
 *  STV0680 USB Camera Driver, by Kevin Sisson (kjsisson@bellsouth.net)
 *
 * Thanks to STMicroelectronics for information on the usb commands, and
 * to Steve Miller at STM for his help and encouragement while I was
 * writing this driver.
 *
 * This driver is based heavily on the
 * Endpoints (formerly known as AOX) se401 USB Camera Driver
 * Copyright (c) 2000 Jeroen B. Vreeken (pe1rxq@amsat.org)
 *
 * Still somewhat based on the Linux ov511 driver.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * History:
 * ver 0.1 October, 2001. Initial attempt.
 *
 * ver 0.2 November, 2001. Fixed asbility to resize, added brightness
 *                         function, made more stable (?)
 *
 * ver 0.21 Nov, 2001.     Added gamma correction and white balance,
 *                         due to Alexander Schwartz. Still trying to
 *                         improve stablility. Moved stuff into stv680.h
 *
 * ver 0.22 Nov, 2001.     Added sharpen function (by Michael Sweet,
 *                         mike@easysw.com) from GIMP, also used in pencam.
 *                         Simple, fast, good integer math routine.
 *
 * ver 0.23 Dec, 2001 (gkh)
 *                         Took out sharpen function, ran code through
 *                         Lindent, and did other minor tweaks to get
 *                         things to work properly with 2.5.1
 *
 * ver 0.24 Jan, 2002 (kjs)
 *                         Fixed the problem with webcam crashing after
 *                         two pictures. Changed the way pic is halved to
 *                         improve quality. Got rid of green line around
 *                         frame. Fix brightness reset when changing size
 *                         bug. Adjusted gamma filters slightly.
 *
 * ver 0.25 Jan, 2002 (kjs)
 *                         Fixed a bug in which the driver sometimes attempted
 *                         to set to a non-supported size. This allowed
 *                         gnomemeeting to work.
 *                         Fixed proc entry removal bug.
 */
 
#include <linux/module.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/errno.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/usb.h>
#include <linux/mutex.h>
 
#include "stv680.h"
 
static int video_nr = -1;
static int swapRGB = 0;   /* default for auto sleect */
static int swapRGB_on = 0; /* default to allow auto select; -1=swap never, +1= swap always */
 
static unsigned int debug = 0;
 
#define PDEBUG(level, fmt, args...) \
        do { \
        if (debug >= level)     \
                info("[%s:%d] " fmt, __FUNCTION__, __LINE__ , ## args); \
        } while (0)
 
 
/*
 * Version Information
 */
#define DRIVER_VERSION "v0.25"
#define DRIVER_AUTHOR "Kevin Sisson <kjsisson@bellsouth.net>"
#define DRIVER_DESC "STV0680 USB Camera Driver"
 
MODULE_AUTHOR (DRIVER_AUTHOR);
MODULE_DESCRIPTION (DRIVER_DESC);
MODULE_LICENSE ("GPL");
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC (debug, "Debug enabled or not");
module_param(swapRGB_on, int, 0);
MODULE_PARM_DESC (swapRGB_on, "Red/blue swap: 1=always, 0=auto, -1=never");
module_param(video_nr, int, 0);
 
/********************************************************************
 *
 * Memory management
 *
 * This is a shameless copy from the USB-cpia driver (linux kernel
 * version 2.3.29 or so, I have no idea what this code actually does ;).
 * Actually it seems to be a copy of a shameless copy of the bttv-driver.
 * Or that is a copy of a shameless copy of ... (To the powers: is there
 * no generic kernel-function to do this sort of stuff?)
 *
 * Yes, it was a shameless copy from the bttv-driver. IIRC, Alan says
 * there will be one, but apparentely not yet -jerdfelt
 *
 * So I copied it again for the ov511 driver -claudio
 *
 * Same for the se401 driver -Jeroen
 *
 * And the STV0680 driver - Kevin
 ********************************************************************/
static void *rvmalloc (unsigned long size)
{
        void *mem;
        unsigned long adr;
 
        size = PAGE_ALIGN(size);
        mem = vmalloc_32 (size);
        if (!mem)
                return NULL;
 
        memset (mem, 0, size);   /* Clear the ram out, no junk to the user */
        adr = (unsigned long) mem;
        while (size > 0) {
                SetPageReserved(vmalloc_to_page((void *)adr));
                adr += PAGE_SIZE;
                size -= PAGE_SIZE;
        }
        return mem;
}
 
static void rvfree (void *mem, unsigned long size)
{
        unsigned long adr;
 
        if (!mem)
                return;
 
        adr = (unsigned long) mem;
        while ((long) size > 0) {
                ClearPageReserved(vmalloc_to_page((void *)adr));
                adr += PAGE_SIZE;
                size -= PAGE_SIZE;
        }
        vfree (mem);
}
 
 
/*********************************************************************
 * pencam read/write functions
 ********************************************************************/
 
static int stv_sndctrl (int set, struct usb_stv *stv680, unsigned short req, unsigned short value, unsigned char *buffer, int size)
{
        int ret = -1;
 
        switch (set) {
        case 0:          /*  0xc1  */
                ret = usb_control_msg (stv680->udev,
                                       usb_rcvctrlpipe (stv680->udev, 0),
                                       req,
                                       (USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT),
                                       value, 0, buffer, size, PENCAM_TIMEOUT);
                break;
 
        case 1:         /*  0x41  */
                ret = usb_control_msg (stv680->udev,
                                       usb_sndctrlpipe (stv680->udev, 0),
                                       req,
                                       (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT),
                                       value, 0, buffer, size, PENCAM_TIMEOUT);
                break;
 
        case 2:         /*  0x80  */
                ret = usb_control_msg (stv680->udev,
                                       usb_rcvctrlpipe (stv680->udev, 0),
                                       req,
                                       (USB_DIR_IN | USB_RECIP_DEVICE),
                                       value, 0, buffer, size, PENCAM_TIMEOUT);
                break;
 
        case 3:         /*  0x40  */
                ret = usb_control_msg (stv680->udev,
                                       usb_sndctrlpipe (stv680->udev, 0),
                                       req,
                                       (USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE),
                                       value, 0, buffer, size, PENCAM_TIMEOUT);
                break;
 
        }
        if ((ret < 0) && (req != 0x0a)) {
                PDEBUG (1, "STV(e): usb_control_msg error %i, request = 0x%x, error = %i", set, req, ret);
        }
        return ret;
}
 
static int stv_set_config (struct usb_stv *dev, int configuration, int interface, int alternate)
{
 
        if (configuration != dev->udev->actconfig->desc.bConfigurationValue
                        || usb_reset_configuration (dev->udev) < 0) {
                PDEBUG (1, "STV(e): FAILED to reset configuration %i", configuration);
                return -1;
        }
        if (usb_set_interface (dev->udev, interface, alternate) < 0) {
                PDEBUG (1, "STV(e): FAILED to set alternate interface %i", alternate);
                return -1;
        }
        return 0;
}
 
static int stv_stop_video (struct usb_stv *dev)
{
        int i;
        unsigned char *buf;
 
        buf = kmalloc (40, GFP_KERNEL);
        if (buf == NULL) {
                PDEBUG (0, "STV(e): Out of (small buf) memory");
                return -1;
        }
 
        /* this is a high priority command; it stops all lower order commands */
        if ((i = stv_sndctrl (1, dev, 0x04, 0x0000, buf, 0x0)) < 0) {
                i = stv_sndctrl (0, dev, 0x80, 0, buf, 0x02);     /* Get Last Error; 2 = busy */
                PDEBUG (1, "STV(i): last error: %i,  command = 0x%x", buf[0], buf[1]);
        } else {
                PDEBUG (1, "STV(i): Camera reset to idle mode.");
        }
 
        if ((i = stv_set_config (dev, 1, 0, 0)) < 0)
                PDEBUG (1, "STV(e): Reset config during exit failed");
 
        /*  get current mode  */
        buf[0] = 0xf0;
        if ((i = stv_sndctrl (0, dev, 0x87, 0, buf, 0x08)) != 0x08)       /* get mode */
                PDEBUG (0, "STV(e): Stop_video: problem setting original mode");
        if (dev->origMode != buf[0]) {
                memset (buf, 0, 8);
                buf[0] = (unsigned char) dev->origMode;
                if ((i = stv_sndctrl (3, dev, 0x07, 0x0100, buf, 0x08)) != 0x08) {
                        PDEBUG (0, "STV(e): Stop_video: Set_Camera_Mode failed");
                        i = -1;
                }
                buf[0] = 0xf0;
                i = stv_sndctrl (0, dev, 0x87, 0, buf, 0x08);
                if ((i != 0x08) || (buf[0] != dev->origMode)) {
                        PDEBUG (0, "STV(e): camera NOT set to original resolution.");
                        i = -1;
                } else
                        PDEBUG (0, "STV(i): Camera set to original resolution");
        }
        /* origMode */
        kfree(buf);
        return i;
}
 
static int stv_set_video_mode (struct usb_stv *dev)
{
        int i, stop_video = 1;
        unsigned char *buf;
 
        buf = kmalloc (40, GFP_KERNEL);
        if (buf == NULL) {
                PDEBUG (0, "STV(e): Out of (small buf) memory");
                return -1;
        }
 
        if ((i = stv_set_config (dev, 1, 0, 0)) < 0) {
                kfree(buf);
                return i;
        }
 
        i = stv_sndctrl (2, dev, 0x06, 0x0100, buf, 0x12);
        if (!(i > 0) && (buf[8] == 0x53) && (buf[9] == 0x05)) {
                PDEBUG (1, "STV(e): Could not get descriptor 0100.");
                goto error;
        }
 
        /*  set alternate interface 1 */
        if ((i = stv_set_config (dev, 1, 0, 1)) < 0)
                goto error;
 
        if ((i = stv_sndctrl (0, dev, 0x85, 0, buf, 0x10)) != 0x10)
                goto error;
        PDEBUG (1, "STV(i): Setting video mode.");
        /*  Switch to Video mode: 0x0100 = VGA (640x480), 0x0000 = CIF (352x288) 0x0300 = QVGA (320x240)  */
        if ((i = stv_sndctrl (1, dev, 0x09, dev->VideoMode, buf, 0x0)) < 0) {
                stop_video = 0;
                goto error;
        }
        goto exit;
 
error:
        kfree(buf);
        if (stop_video == 1)
                stv_stop_video (dev);
        return -1;
 
exit:
        kfree(buf);
        return 0;
}
 
static int stv_init (struct usb_stv *stv680)
{
        int i = 0;
        unsigned char *buffer;
        unsigned long int bufsize;
 
        buffer = kzalloc (40, GFP_KERNEL);
        if (buffer == NULL) {
                PDEBUG (0, "STV(e): Out of (small buf) memory");
                return -1;
        }
        udelay (100);
 
        /* set config 1, interface 0, alternate 0 */
        if ((i = stv_set_config (stv680, 1, 0, 0)) < 0) {
                kfree(buffer);
                PDEBUG (0, "STV(e): set config 1,0,0 failed");
                return -1;
        }
        /* ping camera to be sure STV0680 is present */
        if ((i = stv_sndctrl (0, stv680, 0x88, 0x5678, buffer, 0x02)) != 0x02)
                goto error;
        if ((buffer[0] != 0x56) || (buffer[1] != 0x78)) {
                PDEBUG (1, "STV(e): camera ping failed!!");
                goto error;
        }
 
        /* get camera descriptor */
        if ((i = stv_sndctrl (2, stv680, 0x06, 0x0200, buffer, 0x09)) != 0x09)
                goto error;
        i = stv_sndctrl (2, stv680, 0x06, 0x0200, buffer, 0x22);
        if (!(i >= 0) && (buffer[7] == 0xa0) && (buffer[8] == 0x23)) {
                PDEBUG (1, "STV(e): Could not get descriptor 0200.");
                goto error;
        }
        if ((i = stv_sndctrl (0, stv680, 0x8a, 0, buffer, 0x02)) != 0x02)
                goto error;
        if ((i = stv_sndctrl (0, stv680, 0x8b, 0, buffer, 0x24)) != 0x24)
                goto error;
        if ((i = stv_sndctrl (0, stv680, 0x85, 0, buffer, 0x10)) != 0x10)
                goto error;
 
        stv680->SupportedModes = buffer[7];
        i = stv680->SupportedModes;
        stv680->CIF = 0;
        stv680->VGA = 0;
        stv680->QVGA = 0;
        if (i & 1)
                stv680->CIF = 1;
        if (i & 2)
                stv680->VGA = 1;
        if (i & 8)
                stv680->QVGA = 1;
        if (stv680->SupportedModes == 0) {
                PDEBUG (0, "STV(e): There are NO supported STV680 modes!!");
                i = -1;
                goto error;
        } else {
                if (stv680->CIF)
                        PDEBUG (0, "STV(i): CIF is supported");
                if (stv680->QVGA)
                        PDEBUG (0, "STV(i): QVGA is supported");
        }
        /* FW rev, ASIC rev, sensor ID  */
        PDEBUG (1, "STV(i): Firmware rev is %i.%i", buffer[0], buffer[1]);
        PDEBUG (1, "STV(i): ASIC rev is %i.%i", buffer[2], buffer[3]);
        PDEBUG (1, "STV(i): Sensor ID is %i", (buffer[4]*16) + (buffer[5]>>4));
 
        /*  set alternate interface 1 */
        if ((i = stv_set_config (stv680, 1, 0, 1)) < 0)
                goto error;
 
        if ((i = stv_sndctrl (0, stv680, 0x85, 0, buffer, 0x10)) != 0x10)
                goto error;
        if ((i = stv_sndctrl (0, stv680, 0x8d, 0, buffer, 0x08)) != 0x08)
                goto error;
        i = buffer[3];
        PDEBUG (0, "STV(i): Camera has %i pictures.", i);
 
        /*  get current mode */
        if ((i = stv_sndctrl (0, stv680, 0x87, 0, buffer, 0x08)) != 0x08)
                goto error;
        stv680->origMode = buffer[0];    /* 01 = VGA, 03 = QVGA, 00 = CIF */
 
        /* This will attemp CIF mode, if supported. If not, set to QVGA  */
        memset (buffer, 0, 8);
        if (stv680->CIF)
                buffer[0] = 0x00;
        else if (stv680->QVGA)
                buffer[0] = 0x03;
        if ((i = stv_sndctrl (3, stv680, 0x07, 0x0100, buffer, 0x08)) != 0x08) {
                PDEBUG (0, "STV(i): Set_Camera_Mode failed");
                i = -1;
                goto error;
        }
        buffer[0] = 0xf0;
        stv_sndctrl (0, stv680, 0x87, 0, buffer, 0x08);
        if (((stv680->CIF == 1) && (buffer[0] != 0x00)) || ((stv680->QVGA == 1) && (buffer[0] != 0x03))) {
                PDEBUG (0, "STV(e): Error setting camera video mode!");
                i = -1;
                goto error;
        } else {
                if (buffer[0] == 0) {
                        stv680->VideoMode = 0x0000;
                        PDEBUG (0, "STV(i): Video Mode set to CIF");
                }
                if (buffer[0] == 0x03) {
                        stv680->VideoMode = 0x0300;
                        PDEBUG (0, "STV(i): Video Mode set to QVGA");
                }
        }
        if ((i = stv_sndctrl (0, stv680, 0x8f, 0, buffer, 0x10)) != 0x10)
                goto error;
        bufsize = (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | (buffer[3]);
        stv680->cwidth = (buffer[4] << 8) | (buffer[5]);        /* ->camera = 322, 356, 644  */
        stv680->cheight = (buffer[6] << 8) | (buffer[7]);       /* ->camera = 242, 292, 484  */
        stv680->origGain = buffer[12];
 
        goto exit;
 
error:
        i = stv_sndctrl (0, stv680, 0x80, 0, buffer, 0x02);       /* Get Last Error */
        PDEBUG (1, "STV(i): last error: %i,  command = 0x%x", buffer[0], buffer[1]);
        kfree(buffer);
        return -1;
 
exit:
        kfree(buffer);
 
        /* video = 320x240, 352x288 */
        if (stv680->CIF == 1) {
                stv680->maxwidth = 352;
                stv680->maxheight = 288;
                stv680->vwidth = 352;
                stv680->vheight = 288;
        }
        if (stv680->QVGA == 1) {
                stv680->maxwidth = 320;
                stv680->maxheight = 240;
                stv680->vwidth = 320;
                stv680->vheight = 240;
        }
 
        stv680->rawbufsize = bufsize;   /* must be ./. by 8 */
        stv680->maxframesize = bufsize * 3;     /* RGB size */
        PDEBUG (2, "STV(i): cwidth = %i, cheight = %i", stv680->cwidth, stv680->cheight);
        PDEBUG (1, "STV(i): width = %i, height = %i, rawbufsize = %li", stv680->vwidth, stv680->vheight, stv680->rawbufsize);
 
        /* some default values */
        stv680->bulk_in_endpointAddr = 0x82;
        stv680->dropped = 0;
        stv680->error = 0;
        stv680->framecount = 0;
        stv680->readcount = 0;
        stv680->streaming = 0;
        /* bright, white, colour, hue, contrast are set by software, not in stv0680 */
        stv680->brightness = 32767;
        stv680->chgbright = 0;
        stv680->whiteness = 0;   /* only for greyscale */
        stv680->colour = 32767;
        stv680->contrast = 32767;
        stv680->hue = 32767;
        stv680->palette = STV_VIDEO_PALETTE;
        stv680->depth = 24;     /* rgb24 bits */
        if ((swapRGB_on == 0) && (swapRGB == 0))
                PDEBUG (1, "STV(i): swapRGB is (auto) OFF");
        else if ((swapRGB_on == 0) && (swapRGB == 1))
                PDEBUG (1, "STV(i): swapRGB is (auto) ON");
        else if (swapRGB_on == 1)
                PDEBUG (1, "STV(i): swapRGB is (forced) ON");
        else if (swapRGB_on == -1)
                PDEBUG (1, "STV(i): swapRGB is (forced) OFF");
 
        if (stv_set_video_mode (stv680) < 0) {
                PDEBUG (0, "STV(e): Could not set video mode in stv_init");
                return -1;
        }
 
        return 0;
}
 
/***************** last of pencam  routines  *******************/
 
/****************************************************************************
 *  sysfs
 ***************************************************************************/
#define stv680_file(name, variable, field)                              \
static ssize_t show_##name(struct device *class_dev,                    \
                           struct device_attribute *attr, char *buf)    \
{                                                                       \
        struct video_device *vdev = to_video_device(class_dev);         \
        struct usb_stv *stv = video_get_drvdata(vdev);                  \
        return sprintf(buf, field, stv->variable);                      \
}                                                                       \
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 
stv680_file(model, camera_name, "%s\n");
stv680_file(in_use, user, "%d\n");
stv680_file(streaming, streaming, "%d\n");
stv680_file(palette, palette, "%i\n");
stv680_file(frames_total, readcount, "%d\n");
stv680_file(frames_read, framecount, "%d\n");
stv680_file(packets_dropped, dropped, "%d\n");
stv680_file(decoding_errors, error, "%d\n");
 
static int stv680_create_sysfs_files(struct video_device *vdev)
{
        int rc;
 
        rc = video_device_create_file(vdev, &dev_attr_model);
        if (rc) goto err;
        rc = video_device_create_file(vdev, &dev_attr_in_use);
        if (rc) goto err_model;
        rc = video_device_create_file(vdev, &dev_attr_streaming);
        if (rc) goto err_inuse;
        rc = video_device_create_file(vdev, &dev_attr_palette);
        if (rc) goto err_stream;
        rc = video_device_create_file(vdev, &dev_attr_frames_total);
        if (rc) goto err_pal;
        rc = video_device_create_file(vdev, &dev_attr_frames_read);
        if (rc) goto err_framtot;
        rc = video_device_create_file(vdev, &dev_attr_packets_dropped);
        if (rc) goto err_framread;
        rc = video_device_create_file(vdev, &dev_attr_decoding_errors);
        if (rc) goto err_dropped;
 
        return 0;
 
err_dropped:
        video_device_remove_file(vdev, &dev_attr_packets_dropped);
err_framread:
        video_device_remove_file(vdev, &dev_attr_frames_read);
err_framtot:
        video_device_remove_file(vdev, &dev_attr_frames_total);
err_pal:
        video_device_remove_file(vdev, &dev_attr_palette);
err_stream:
        video_device_remove_file(vdev, &dev_attr_streaming);
err_inuse:
        video_device_remove_file(vdev, &dev_attr_in_use);
err_model:
        video_device_remove_file(vdev, &dev_attr_model);
err:
        return rc;
}
 
static void stv680_remove_sysfs_files(struct video_device *vdev)
{
        video_device_remove_file(vdev, &dev_attr_model);
        video_device_remove_file(vdev, &dev_attr_in_use);
        video_device_remove_file(vdev, &dev_attr_streaming);
        video_device_remove_file(vdev, &dev_attr_palette);
        video_device_remove_file(vdev, &dev_attr_frames_total);
        video_device_remove_file(vdev, &dev_attr_frames_read);
        video_device_remove_file(vdev, &dev_attr_packets_dropped);
        video_device_remove_file(vdev, &dev_attr_decoding_errors);
}
 
/********************************************************************
 * Camera control
 *******************************************************************/
 
static int stv680_get_pict (struct usb_stv *stv680, struct video_picture *p)
{
        /* This sets values for v4l interface. max/min = 65535/0  */
 
        p->brightness = stv680->brightness;
        p->whiteness = stv680->whiteness;       /* greyscale */
        p->colour = stv680->colour;
        p->contrast = stv680->contrast;
        p->hue = stv680->hue;
        p->palette = stv680->palette;
        p->depth = stv680->depth;
        return 0;
}
 
static int stv680_set_pict (struct usb_stv *stv680, struct video_picture *p)
{
        /* See above stv680_get_pict  */
 
        if (p->palette != STV_VIDEO_PALETTE) {
                PDEBUG (2, "STV(e): Palette set error in _set_pic");
                return 1;
        }
 
        if (stv680->brightness != p->brightness) {
                stv680->chgbright = 1;
                stv680->brightness = p->brightness;
        }
 
        stv680->whiteness = p->whiteness;       /* greyscale */
        stv680->colour = p->colour;
        stv680->contrast = p->contrast;
        stv680->hue = p->hue;
        stv680->palette = p->palette;
        stv680->depth = p->depth;
 
        return 0;
}
 
static void stv680_video_irq (struct urb *urb)
{
        struct usb_stv *stv680 = urb->context;
        int length = urb->actual_length;
 
        if (length < stv680->rawbufsize)
                PDEBUG (2, "STV(i): Lost data in transfer: exp %li, got %i", stv680->rawbufsize, length);
 
        /* ohoh... */
        if (!stv680->streaming)
                return;
 
        if (!stv680->udev) {
                PDEBUG (0, "STV(e): device vapourished in video_irq");
                return;
        }
 
        /* 0 sized packets happen if we are to fast, but sometimes the camera
           keeps sending them forever...
         */
        if (length && !urb->status) {
                stv680->nullpackets = 0;
                switch (stv680->scratch[stv680->scratch_next].state) {
                case BUFFER_READY:
                case BUFFER_BUSY:
                        stv680->dropped++;
                        break;
 
                case BUFFER_UNUSED:
                        memcpy (stv680->scratch[stv680->scratch_next].data,
                                (unsigned char *) urb->transfer_buffer, length);
                        stv680->scratch[stv680->scratch_next].state = BUFFER_READY;
                        stv680->scratch[stv680->scratch_next].length = length;
                        if (waitqueue_active (&stv680->wq)) {
                                wake_up_interruptible (&stv680->wq);
                        }
                        stv680->scratch_overflow = 0;
                        stv680->scratch_next++;
                        if (stv680->scratch_next >= STV680_NUMSCRATCH)
                                stv680->scratch_next = 0;
                        break;
                }               /* switch  */
        } else {
                stv680->nullpackets++;
                if (stv680->nullpackets > STV680_MAX_NULLPACKETS) {
                        if (waitqueue_active (&stv680->wq)) {
                                wake_up_interruptible (&stv680->wq);
                        }
                }
        }                       /*  if - else */
 
        /* Resubmit urb for new data */
        urb->status = 0;
        urb->dev = stv680->udev;
        if (usb_submit_urb (urb, GFP_ATOMIC))
                PDEBUG (0, "STV(e): urb burned down in video irq");
        return;
}                               /*  _video_irq  */
 
static int stv680_start_stream (struct usb_stv *stv680)
{
        struct urb *urb;
        int err = 0, i;
 
        stv680->streaming = 1;
 
        /* Do some memory allocation */
        for (i = 0; i < STV680_NUMFRAMES; i++) {
                stv680->frame[i].data = stv680->fbuf + i * stv680->maxframesize;
                stv680->frame[i].curpix = 0;
        }
        /* packet size = 4096  */
        for (i = 0; i < STV680_NUMSBUF; i++) {
                stv680->sbuf[i].data = kmalloc (stv680->rawbufsize, GFP_KERNEL);
                if (stv680->sbuf[i].data == NULL) {
                        PDEBUG (0, "STV(e): Could not kmalloc raw data buffer %i", i);
                        goto nomem_err;
                }
        }
 
        stv680->scratch_next = 0;
        stv680->scratch_use = 0;
        stv680->scratch_overflow = 0;
        for (i = 0; i < STV680_NUMSCRATCH; i++) {
                stv680->scratch[i].data = kmalloc (stv680->rawbufsize, GFP_KERNEL);
                if (stv680->scratch[i].data == NULL) {
                        PDEBUG (0, "STV(e): Could not kmalloc raw scratch buffer %i", i);
                        goto nomem_err;
                }
                stv680->scratch[i].state = BUFFER_UNUSED;
        }
 
        for (i = 0; i < STV680_NUMSBUF; i++) {
                urb = usb_alloc_urb (0, GFP_KERNEL);
                if (!urb)
                        goto nomem_err;
 
                /* sbuf is urb->transfer_buffer, later gets memcpyed to scratch */
                usb_fill_bulk_urb (urb, stv680->udev,
                                   usb_rcvbulkpipe (stv680->udev, stv680->bulk_in_endpointAddr),
                                   stv680->sbuf[i].data, stv680->rawbufsize,
                                   stv680_video_irq, stv680);
                stv680->urb[i] = urb;
                err = usb_submit_urb (stv680->urb[i], GFP_KERNEL);
                if (err) {
                        PDEBUG (0, "STV(e): urb burned down with err "
                                   "%d in start stream %d", err, i);
                        goto nomem_err;
                }
        }                       /* i STV680_NUMSBUF */
 
        stv680->framecount = 0;
        return 0;
 
 nomem_err:
        for (i = 0; i < STV680_NUMSCRATCH; i++) {
                kfree(stv680->scratch[i].data);
                stv680->scratch[i].data = NULL;
        }
        for (i = 0; i < STV680_NUMSBUF; i++) {
                usb_kill_urb(stv680->urb[i]);
                usb_free_urb(stv680->urb[i]);
                stv680->urb[i] = NULL;
                kfree(stv680->sbuf[i].data);
                stv680->sbuf[i].data = NULL;
        }
        return -ENOMEM;
 
}
 
static int stv680_stop_stream (struct usb_stv *stv680)
{
        int i;
 
        if (!stv680->streaming || !stv680->udev)
                return 1;
 
        stv680->streaming = 0;
 
        for (i = 0; i < STV680_NUMSBUF; i++)
                if (stv680->urb[i]) {
                        usb_kill_urb (stv680->urb[i]);
                        usb_free_urb (stv680->urb[i]);
                        stv680->urb[i] = NULL;
                        kfree(stv680->sbuf[i].data);
                }
        for (i = 0; i < STV680_NUMSCRATCH; i++) {
                kfree(stv680->scratch[i].data);
                stv680->scratch[i].data = NULL;
        }
 
        return 0;
}
 
static int stv680_set_size (struct usb_stv *stv680, int width, int height)
{
        int wasstreaming = stv680->streaming;
 
        /* Check to see if we need to change */
        if ((stv680->vwidth == width) && (stv680->vheight == height))
                return 0;
 
        PDEBUG (1, "STV(i): size request for %i x %i", width, height);
        /* Check for a valid mode */
        if ((!width || !height) || ((width & 1) || (height & 1))) {
                PDEBUG (1, "STV(e): set_size error: request: v.width = %i, v.height = %i  actual: stv.width = %i, stv.height = %i", width, height, stv680->vwidth, stv680->vheight);
                return 1;
        }
 
        if ((width < (stv680->maxwidth / 2)) || (height < (stv680->maxheight / 2))) {
                width = stv680->maxwidth / 2;
                height = stv680->maxheight / 2;
        } else if ((width >= 158) && (width <= 166) && (stv680->QVGA == 1)) {
                width = 160;
                height = 120;
        } else if ((width >= 172) && (width <= 180) && (stv680->CIF == 1)) {
                width = 176;
                height = 144;
        } else if ((width >= 318) && (width <= 350) && (stv680->QVGA == 1)) {
                width = 320;
                height = 240;
        } else if ((width >= 350) && (width <= 358) && (stv680->CIF == 1)) {
                width = 352;
                height = 288;
        } else {
                PDEBUG (1, "STV(e): request for non-supported size: request: v.width = %i, v.height = %i  actual: stv.width = %i, stv.height = %i", width, height, stv680->vwidth, stv680->vheight);
                return 1;
        }
 
        /* Stop a current stream and start it again at the new size */
        if (wasstreaming)
                stv680_stop_stream (stv680);
        stv680->vwidth = width;
        stv680->vheight = height;
        PDEBUG (1, "STV(i): size set to %i x %i", stv680->vwidth, stv680->vheight);
        if (wasstreaming)
                stv680_start_stream (stv680);
 
        return 0;
}
 
/**********************************************************************
 * Video Decoding
 **********************************************************************/
 
/*******  routines from the pencam program; hey, they work!  ********/
 
/*
 * STV0680 Vision Camera Chipset Driver
 * Copyright (C) 2000 Adam Harrison <adam@antispin.org>
*/
 
#define RED 0
#define GREEN 1
#define BLUE 2
#define AD(x, y, w) (((y)*(w)+(x))*3)
 
static void bayer_unshuffle (struct usb_stv *stv680, struct stv680_scratch *buffer)
{
        int x, y, i;
        int w = stv680->cwidth;
        int vw = stv680->cwidth, vh = stv680->cheight;
        unsigned int p = 0;
        int colour = 0, bayer = 0;
        unsigned char *raw = buffer->data;
        struct stv680_frame *frame = &stv680->frame[stv680->curframe];
        unsigned char *output = frame->data;
        unsigned char *temp = frame->data;
        int offset = buffer->offset;
 
        if (frame->curpix == 0) {
                if (frame->grabstate == FRAME_READY) {
                        frame->grabstate = FRAME_GRABBING;
                }
        }
        if (offset != frame->curpix) {  /* Regard frame as lost :( */
                frame->curpix = 0;
                stv680->error++;
                return;
        }
 
        if ((stv680->vwidth == 320) || (stv680->vwidth == 160)) {
                vw = 320;
                vh = 240;
        }
        if ((stv680->vwidth == 352) || (stv680->vwidth == 176)) {
                vw = 352;
                vh = 288;
        }
 
        memset (output, 0, 3 * vw * vh); /* clear output matrix. */
 
        for (y = 0; y < vh; y++) {
                for (x = 0; x < vw; x++) {
                        if (x & 1)
                                p = *(raw + y * w + (x >> 1));
                        else
                                p = *(raw + y * w + (x >> 1) + (w >> 1));
 
                        if (y & 1)
                                bayer = 2;
                        else
                                bayer = 0;
                        if (x & 1)
                                bayer++;
 
                        switch (bayer) {
                        case 0:
                        case 3:
                                colour = 1;
                                break;
                        case 1:
                                colour = 0;
                                break;
                        case 2:
                                colour = 2;
                                break;
                        }
                        i = (y * vw + x) * 3;
                        *(output + i + colour) = (unsigned char) p;
                }               /* for x */
 
        }                       /* for y */
 
        /****** gamma correction plus hardcoded white balance */
        /* Thanks to Alexander Schwartx <alexander.schwartx@gmx.net> for this code.
           Correction values red[], green[], blue[], are generated by
           (pow(i/256.0, GAMMA)*255.0)*white balanceRGB where GAMMA=0.55, 1<i<255.
           White balance (RGB)= 1.0, 1.17, 1.48. Values are calculated as double float and
           converted to unsigned char. Values are in stv680.h  */
 
        for (y = 0; y < vh; y++) {
                for (x = 0; x < vw; x++) {
                        i = (y * vw + x) * 3;
                        *(output + i) = red[*(output + i)];
                        *(output + i + 1) = green[*(output + i + 1)];
                        *(output + i + 2) = blue[*(output + i + 2)];
                }
        }
 
        /******  bayer demosaic  ******/
        for (y = 1; y < (vh - 1); y++) {
                for (x = 1; x < (vw - 1); x++) {        /* work out pixel type */
                        if (y & 1)
                                bayer = 0;
                        else
                                bayer = 2;
                        if (!(x & 1))
                                bayer++;
 
                        switch (bayer) {
                        case 0:  /* green. blue lr, red tb */
                                *(output + AD (x, y, vw) + BLUE) = ((int) *(output + AD (x - 1, y, vw) + BLUE) + (int) *(output + AD (x + 1, y, vw) + BLUE)) >> 1;
                                *(output + AD (x, y, vw) + RED) = ((int) *(output + AD (x, y - 1, vw) + RED) + (int) *(output + AD (x, y + 1, vw) + RED)) >> 1;
                                break;
 
                        case 1: /* blue. green lrtb, red diagonals */
                                *(output + AD (x, y, vw) + GREEN) = ((int) *(output + AD (x - 1, y, vw) + GREEN) + (int) *(output + AD (x + 1, y, vw) + GREEN) + (int) *(output + AD (x, y - 1, vw) + GREEN) + (int) *(output + AD (x, y + 1, vw) + GREEN)) >> 2;
                                *(output + AD (x, y, vw) + RED) = ((int) *(output + AD (x - 1, y - 1, vw) + RED) + (int) *(output + AD (x - 1, y + 1, vw) + RED) + (int) *(output + AD (x + 1, y - 1, vw) + RED) + (int) *(output + AD (x + 1, y + 1, vw) + RED)) >> 2;
                                break;
 
                        case 2: /* red. green lrtb, blue diagonals */
                                *(output + AD (x, y, vw) + GREEN) = ((int) *(output + AD (x - 1, y, vw) + GREEN) + (int) *(output + AD (x + 1, y, vw) + GREEN) + (int) *(output + AD (x, y - 1, vw) + GREEN) + (int) *(output + AD (x, y + 1, vw) + GREEN)) >> 2;
                                *(output + AD (x, y, vw) + BLUE) = ((int) *(output + AD (x - 1, y - 1, vw) + BLUE) + (int) *(output + AD (x + 1, y - 1, vw) + BLUE) + (int) *(output + AD (x - 1, y + 1, vw) + BLUE) + (int) *(output + AD (x + 1, y + 1, vw) + BLUE)) >> 2;
                                break;
 
                        case 3: /* green. red lr, blue tb */
                                *(output + AD (x, y, vw) + RED) = ((int) *(output + AD (x - 1, y, vw) + RED) + (int) *(output + AD (x + 1, y, vw) + RED)) >> 1;
                                *(output + AD (x, y, vw) + BLUE) = ((int) *(output + AD (x, y - 1, vw) + BLUE) + (int) *(output + AD (x, y + 1, vw) + BLUE)) >> 1;
                                break;
                        }       /* switch */
                }               /* for x */
        }                       /* for y  - end demosaic  */
 
        /* fix top and bottom row, left and right side */
        i = vw * 3;
        memcpy (output, (output + i), i);
        memcpy ((output + (vh * i)), (output + ((vh - 1) * i)), i);
        for (y = 0; y < vh; y++) {
                i = y * vw * 3;
                memcpy ((output + i), (output + i + 3), 3);
                memcpy ((output + i + (vw * 3)), (output + i + (vw - 1) * 3), 3);
        }
 
        /*  process all raw data, then trim to size if necessary */
        if ((stv680->vwidth == 160) || (stv680->vwidth == 176))  {
                i = 0;
                for (y = 0; y < vh; y++) {
                        if (!(y & 1)) {
                                for (x = 0; x < vw; x++) {
                                        p = (y * vw + x) * 3;
                                        if (!(x & 1)) {
                                                *(output + i) = *(output + p);
                                                *(output + i + 1) = *(output + p + 1);
                                                *(output + i + 2) = *(output + p + 2);
                                                i += 3;
                                        }
                                }  /* for x */
                        }
                }  /* for y */
        }
        /* reset to proper width */
        if ((stv680->vwidth == 160)) {
                vw = 160;
                vh = 120;
        }
        if ((stv680->vwidth == 176)) {
                vw = 176;
                vh = 144;
        }
 
        /* output is RGB; some programs want BGR  */
        /* swapRGB_on=0 -> program decides;  swapRGB_on=1, always swap */
        /* swapRGB_on=-1, never swap */
        if (((swapRGB == 1) && (swapRGB_on != -1)) || (swapRGB_on == 1)) {
                for (y = 0; y < vh; y++) {
                        for (x = 0; x < vw; x++) {
                                i = (y * vw + x) * 3;
                                *(temp) = *(output + i);
                                *(output + i) = *(output + i + 2);
                                *(output + i + 2) = *(temp);
                        }
                }
        }
        /* brightness */
        if (stv680->chgbright == 1) {
                if (stv680->brightness >= 32767) {
                        p = (stv680->brightness - 32767) / 256;
                        for (x = 0; x < (vw * vh * 3); x++) {
                                if ((*(output + x) + (unsigned char) p) > 255)
                                        *(output + x) = 255;
                                else
                                        *(output + x) += (unsigned char) p;
                        }       /* for */
                } else {
                        p = (32767 - stv680->brightness) / 256;
                        for (x = 0; x < (vw * vh * 3); x++) {
                                if ((unsigned char) p > *(output + x))
                                        *(output + x) = 0;
                                else
                                        *(output + x) -= (unsigned char) p;
                        }       /* for */
                }               /* else */
        }
        /* if */
        frame->curpix = 0;
        frame->curlinepix = 0;
        frame->grabstate = FRAME_DONE;
        stv680->framecount++;
        stv680->readcount++;
        if (stv680->frame[(stv680->curframe + 1) & (STV680_NUMFRAMES - 1)].grabstate == FRAME_READY) {
                stv680->curframe = (stv680->curframe + 1) & (STV680_NUMFRAMES - 1);
        }
 
}                               /* bayer_unshuffle */
 
/*******  end routines from the pencam program  *********/
 
static int stv680_newframe (struct usb_stv *stv680, int framenr)
{
        int errors = 0;
 
        while (stv680->streaming && (stv680->frame[framenr].grabstate == FRAME_READY || stv680->frame[framenr].grabstate == FRAME_GRABBING)) {
                if (!stv680->frame[framenr].curpix) {
                        errors++;
                }
                wait_event_interruptible (stv680->wq, (stv680->scratch[stv680->scratch_use].state == BUFFER_READY));
 
                if (stv680->nullpackets > STV680_MAX_NULLPACKETS) {
                        stv680->nullpackets = 0;
                        PDEBUG (2, "STV(i): too many null length packets, restarting capture");
                        stv680_stop_stream (stv680);
                        stv680_start_stream (stv680);
                } else {
                        if (stv680->scratch[stv680->scratch_use].state != BUFFER_READY) {
                                stv680->frame[framenr].grabstate = FRAME_ERROR;
                                PDEBUG (2, "STV(e): FRAME_ERROR in _newframe");
                                return -EIO;
                        }
                        stv680->scratch[stv680->scratch_use].state = BUFFER_BUSY;
 
                        bayer_unshuffle (stv680, &stv680->scratch[stv680->scratch_use]);
 
                        stv680->scratch[stv680->scratch_use].state = BUFFER_UNUSED;
                        stv680->scratch_use++;
                        if (stv680->scratch_use >= STV680_NUMSCRATCH)
                                stv680->scratch_use = 0;
                        if (errors > STV680_MAX_ERRORS) {
                                errors = 0;
                                PDEBUG (2, "STV(i): too many errors, restarting capture");
                                stv680_stop_stream (stv680);
                                stv680_start_stream (stv680);
                        }
                }               /* else */
        }                       /* while */
        return 0;
}
 
/*********************************************************************
 * Video4Linux
 *********************************************************************/
 
static int stv_open (struct inode *inode, struct file *file)
{
        struct video_device *dev = video_devdata(file);
        struct usb_stv *stv680 = video_get_drvdata(dev);
        int err = 0;
 
        /* we are called with the BKL held */
        stv680->user = 1;
        err = stv_init (stv680);        /* main initialization routine for camera */
 
        if (err >= 0) {
                stv680->fbuf = rvmalloc (stv680->maxframesize * STV680_NUMFRAMES);
                if (!stv680->fbuf) {
                        PDEBUG (0, "STV(e): Could not rvmalloc frame bufer");
                        err = -ENOMEM;
                }
                file->private_data = dev;
        }
        if (err)
                stv680->user = 0;
 
        return err;
}
 
static int stv_close (struct inode *inode, struct file *file)
{
        struct video_device *dev = file->private_data;
        struct usb_stv *stv680 = video_get_drvdata(dev);
        int i;
 
        for (i = 0; i < STV680_NUMFRAMES; i++)
                stv680->frame[i].grabstate = FRAME_UNUSED;
        if (stv680->streaming)
                stv680_stop_stream (stv680);
 
        if ((i = stv_stop_video (stv680)) < 0)
                PDEBUG (1, "STV(e): stop_video failed in stv_close");
 
        rvfree (stv680->fbuf, stv680->maxframesize * STV680_NUMFRAMES);
        stv680->user = 0;
 
        if (stv680->removed) {
                kfree(stv680);
                stv680 = NULL;
                PDEBUG (0, "STV(i): device unregistered");
        }
        file->private_data = NULL;
        return 0;
}
 
static int stv680_do_ioctl (struct inode *inode, struct file *file,
                            unsigned int cmd, void *arg)
{
        struct video_device *vdev = file->private_data;
        struct usb_stv *stv680 = video_get_drvdata(vdev);
 
        if (!stv680->udev)
                return -EIO;
 
        switch (cmd) {
        case VIDIOCGCAP:{
                        struct video_capability *b = arg;
 
                        strcpy (b->name, stv680->camera_name);
                        b->type = VID_TYPE_CAPTURE;
                        b->channels = 1;
                        b->audios = 0;
                        b->maxwidth = stv680->maxwidth;
                        b->maxheight = stv680->maxheight;
                        b->minwidth = stv680->maxwidth / 2;
                        b->minheight = stv680->maxheight / 2;
                        return 0;
                }
        case VIDIOCGCHAN:{
                        struct video_channel *v = arg;
 
                        if (v->channel != 0)
                                return -EINVAL;
                        v->flags = 0;
                        v->tuners = 0;
                        v->type = VIDEO_TYPE_CAMERA;
                        strcpy (v->name, "STV Camera");
                        return 0;
                }
        case VIDIOCSCHAN:{
                        struct video_channel *v = arg;
                        if (v->channel != 0)
                                return -EINVAL;
                        return 0;
                }
        case VIDIOCGPICT:{
                        struct video_picture *p = arg;
 
                        stv680_get_pict (stv680, p);
                        return 0;
                }
        case VIDIOCSPICT:{
                        struct video_picture *p = arg;
 
                        if (stv680_set_pict (stv680, p))
                                return -EINVAL;
                        return 0;
                }
        case VIDIOCSWIN:{
                        struct video_window *vw = arg;
 
                        if (vw->flags)
                                return -EINVAL;
                        if (vw->clipcount)
                                return -EINVAL;
                        if (vw->width != stv680->vwidth) {
                                if (stv680_set_size (stv680, vw->width, vw->height)) {
                                        PDEBUG (2, "STV(e): failed (from user) set size in VIDIOCSWIN");
                                        return -EINVAL;
                                }
                        }
                        return 0;
                }
        case VIDIOCGWIN:{
                        struct video_window *vw = arg;
 
                        vw->x = 0;       /* FIXME */
                        vw->y = 0;
                        vw->chromakey = 0;
                        vw->flags = 0;
                        vw->clipcount = 0;
                        vw->width = stv680->vwidth;
                        vw->height = stv680->vheight;
                        return 0;
                }
        case VIDIOCGMBUF:{
                        struct video_mbuf *vm = arg;
                        int i;
 
                        memset (vm, 0, sizeof (*vm));
                        vm->size = STV680_NUMFRAMES * stv680->maxframesize;
                        vm->frames = STV680_NUMFRAMES;
                        for (i = 0; i < STV680_NUMFRAMES; i++)
                                vm->offsets[i] = stv680->maxframesize * i;
                        return 0;
                }
        case VIDIOCMCAPTURE:{
                        struct video_mmap *vm = arg;
 
                        if (vm->format != STV_VIDEO_PALETTE) {
                                PDEBUG (2, "STV(i): VIDIOCMCAPTURE vm.format (%i) != VIDEO_PALETTE (%i)",
                                        vm->format, STV_VIDEO_PALETTE);
                                if ((vm->format == 3) && (swapRGB_on == 0))  {
                                        PDEBUG (2, "STV(i): VIDIOCMCAPTURE swapRGB is (auto) ON");
                                        /* this may fix those apps (e.g., xawtv) that want BGR */
                                        swapRGB = 1;
                                }
                                return -EINVAL;
                        }
                        if (vm->frame >= STV680_NUMFRAMES) {
                                PDEBUG (2, "STV(e): VIDIOCMCAPTURE vm.frame > NUMFRAMES");
                                return -EINVAL;
                        }
                        if ((stv680->frame[vm->frame].grabstate == FRAME_ERROR)
                            || (stv680->frame[vm->frame].grabstate == FRAME_GRABBING)) {
                                PDEBUG (2, "STV(e): VIDIOCMCAPTURE grabstate (%i) error",
                                        stv680->frame[vm->frame].grabstate);
                                return -EBUSY;
                        }
                        /* Is this according to the v4l spec??? */
                        if (stv680->vwidth != vm->width) {
                                if (stv680_set_size (stv680, vm->width, vm->height)) {
                                        PDEBUG (2, "STV(e): VIDIOCMCAPTURE set_size failed");
                                        return -EINVAL;
                                }
                        }
                        stv680->frame[vm->frame].grabstate = FRAME_READY;
 
                        if (!stv680->streaming)
                                stv680_start_stream (stv680);
 
                        return 0;
                }
        case VIDIOCSYNC:{
                        int *frame = arg;
                        int ret = 0;
 
                        if (*frame < 0 || *frame >= STV680_NUMFRAMES) {
                                PDEBUG (2, "STV(e): Bad frame # in VIDIOCSYNC");
                                return -EINVAL;
                        }
                        ret = stv680_newframe (stv680, *frame);
                        stv680->frame[*frame].grabstate = FRAME_UNUSED;
                        return ret;
                }
        case VIDIOCGFBUF:{
                        struct video_buffer *vb = arg;
 
                        memset (vb, 0, sizeof (*vb));
                        return 0;
                }
        case VIDIOCKEY:
                return 0;
        case VIDIOCCAPTURE:
                {
                        PDEBUG (2, "STV(e): VIDIOCCAPTURE failed");
                        return -EINVAL;
                }
        case VIDIOCSFBUF:
        case VIDIOCGTUNER:
        case VIDIOCSTUNER:
        case VIDIOCGFREQ:
        case VIDIOCSFREQ:
        case VIDIOCGAUDIO:
        case VIDIOCSAUDIO:
                return -EINVAL;
        default:
                return -ENOIOCTLCMD;
        }                       /* end switch */
 
        return 0;
}
 
static int stv680_ioctl(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
{
        return video_usercopy(inode, file, cmd, arg, stv680_do_ioctl);
}
 
static int stv680_mmap (struct file *file, struct vm_area_struct *vma)
{
        struct video_device *dev = file->private_data;
        struct usb_stv *stv680 = video_get_drvdata(dev);
        unsigned long start = vma->vm_start;
        unsigned long size  = vma->vm_end-vma->vm_start;
        unsigned long page, pos;
 
        mutex_lock(&stv680->lock);
 
        if (stv680->udev == NULL) {
                mutex_unlock(&stv680->lock);
                return -EIO;
        }
        if (size > (((STV680_NUMFRAMES * stv680->maxframesize) + PAGE_SIZE - 1)
                    & ~(PAGE_SIZE - 1))) {
                mutex_unlock(&stv680->lock);
                return -EINVAL;
        }
        pos = (unsigned long) stv680->fbuf;
        while (size > 0) {
                page = vmalloc_to_pfn((void *)pos);
                if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
                        mutex_unlock(&stv680->lock);
                        return -EAGAIN;
                }
                start += PAGE_SIZE;
                pos += PAGE_SIZE;
                if (size > PAGE_SIZE)
                        size -= PAGE_SIZE;
                else
                        size = 0;
        }
        mutex_unlock(&stv680->lock);
 
        return 0;
}
 
static ssize_t stv680_read (struct file *file, char __user *buf,
                        size_t count, loff_t *ppos)
{
        struct video_device *dev = file->private_data;
        unsigned long int realcount = count;
        int ret = 0;
        struct usb_stv *stv680 = video_get_drvdata(dev);
        unsigned long int i;
 
        if (STV680_NUMFRAMES != 2) {
                PDEBUG (0, "STV(e): STV680_NUMFRAMES needs to be 2!");
                return -1;
        }
        if (stv680->udev == NULL)
                return -EIO;
        if (realcount > (stv680->vwidth * stv680->vheight * 3))
                realcount = stv680->vwidth * stv680->vheight * 3;
 
        /* Shouldn't happen: */
        if (stv680->frame[0].grabstate == FRAME_GRABBING) {
                PDEBUG (2, "STV(e): FRAME_GRABBING in stv680_read");
                return -EBUSY;
        }
        stv680->frame[0].grabstate = FRAME_READY;
        stv680->frame[1].grabstate = FRAME_UNUSED;
        stv680->curframe = 0;
 
        if (!stv680->streaming)
                stv680_start_stream (stv680);
 
        if (!stv680->streaming) {
                ret = stv680_newframe (stv680, 0);       /* ret should = 0 */
        }
 
        ret = stv680_newframe (stv680, 0);
 
        if (!ret) {
                if ((i = copy_to_user (buf, stv680->frame[0].data, realcount)) != 0) {
                        PDEBUG (2, "STV(e): copy_to_user frame 0 failed, ret count = %li", i);
                        return -EFAULT;
                }
        } else {
                realcount = ret;
        }
        stv680->frame[0].grabstate = FRAME_UNUSED;
        return realcount;
}                               /* stv680_read */
 
static const struct file_operations stv680_fops = {
        .owner =        THIS_MODULE,
        .open =         stv_open,
        .release =      stv_close,
        .read =         stv680_read,
        .mmap =         stv680_mmap,
        .ioctl =        stv680_ioctl,
        .compat_ioctl = v4l_compat_ioctl32,
        .llseek =       no_llseek,
};
static struct video_device stv680_template = {
        .owner =        THIS_MODULE,
        .name =         "STV0680 USB camera",
        .type =         VID_TYPE_CAPTURE,
        .fops =         &stv680_fops,
        .release =      video_device_release,
        .minor =        -1,
};
 
static int stv680_probe (struct usb_interface *intf, const struct usb_device_id *id)
{
        struct usb_device *dev = interface_to_usbdev(intf);
        struct usb_host_interface *interface;
        struct usb_stv *stv680 = NULL;
        char *camera_name = NULL;
        int retval = 0;
 
        /* We don't handle multi-config cameras */
        if (dev->descriptor.bNumConfigurations != 1) {
                PDEBUG (0, "STV(e): Number of Configurations != 1");
                return -ENODEV;
        }
 
        interface = &intf->altsetting[0];
        /* Is it a STV680? */
        if ((le16_to_cpu(dev->descriptor.idVendor) == USB_PENCAM_VENDOR_ID) &&
            (le16_to_cpu(dev->descriptor.idProduct) == USB_PENCAM_PRODUCT_ID)) {
                camera_name = "STV0680";
                PDEBUG (0, "STV(i): STV0680 camera found.");
        } else if ((le16_to_cpu(dev->descriptor.idVendor) == USB_CREATIVEGOMINI_VENDOR_ID) &&
                   (le16_to_cpu(dev->descriptor.idProduct) == USB_CREATIVEGOMINI_PRODUCT_ID)) {
                camera_name = "Creative WebCam Go Mini";
                PDEBUG (0, "STV(i): Creative WebCam Go Mini found.");
        } else {
                PDEBUG (0, "STV(e): Vendor/Product ID do not match STV0680 or Creative WebCam Go Mini values.");
                PDEBUG (0, "STV(e): Check that the STV0680 or Creative WebCam Go Mini camera is connected to the computer.");
                retval = -ENODEV;
                goto error;
        }
        /* We found one */
        if ((stv680 = kzalloc (sizeof (*stv680), GFP_KERNEL)) == NULL) {
                PDEBUG (0, "STV(e): couldn't kmalloc stv680 struct.");
                retval = -ENOMEM;
                goto error;
        }
 
        stv680->udev = dev;
        stv680->camera_name = camera_name;
 
        stv680->vdev = video_device_alloc();
        if (!stv680->vdev) {
                retval = -ENOMEM;
                goto error;
        }
        memcpy(stv680->vdev, &stv680_template, sizeof(stv680_template));
        stv680->vdev->dev = &intf->dev;
        video_set_drvdata(stv680->vdev, stv680);
 
        memcpy (stv680->vdev->name, stv680->camera_name, strlen (stv680->camera_name));
        init_waitqueue_head (&stv680->wq);
        mutex_init (&stv680->lock);
        wmb ();
 
        if (video_register_device (stv680->vdev, VFL_TYPE_GRABBER, video_nr) == -1) {
                PDEBUG (0, "STV(e): video_register_device failed");
                retval = -EIO;
                goto error_vdev;
        }
        PDEBUG (0, "STV(i): registered new video device: video%d", stv680->vdev->minor);
 
        usb_set_intfdata (intf, stv680);
        retval = stv680_create_sysfs_files(stv680->vdev);
        if (retval)
                goto error_unreg;
        return 0;
 
error_unreg:
        video_unregister_device(stv680->vdev);
error_vdev:
        video_device_release(stv680->vdev);
error:
        kfree(stv680);
        return retval;
}
 
static inline void usb_stv680_remove_disconnected (struct usb_stv *stv680)
{
        int i;
 
        stv680->udev = NULL;
        stv680->frame[0].grabstate = FRAME_ERROR;
        stv680->frame[1].grabstate = FRAME_ERROR;
        stv680->streaming = 0;
 
        wake_up_interruptible (&stv680->wq);
 
        for (i = 0; i < STV680_NUMSBUF; i++)
                if (stv680->urb[i]) {
                        usb_kill_urb (stv680->urb[i]);
                        usb_free_urb (stv680->urb[i]);
                        stv680->urb[i] = NULL;
                        kfree(stv680->sbuf[i].data);
                }
        for (i = 0; i < STV680_NUMSCRATCH; i++)
                kfree(stv680->scratch[i].data);
        PDEBUG (0, "STV(i): %s disconnected", stv680->camera_name);
 
        /* Free the memory */
        kfree(stv680);
}
 
static void stv680_disconnect (struct usb_interface *intf)
{
        struct usb_stv *stv680 = usb_get_intfdata (intf);
 
        usb_set_intfdata (intf, NULL);
 
        if (stv680) {
                /* We don't want people trying to open up the device */
                if (stv680->vdev) {
                        stv680_remove_sysfs_files(stv680->vdev);
                        video_unregister_device(stv680->vdev);
                        stv680->vdev = NULL;
                }
                if (!stv680->user) {
                        usb_stv680_remove_disconnected (stv680);
                } else {
                        stv680->removed = 1;
                }
        }
}
 
static struct usb_driver stv680_driver = {
        .name =         "stv680",
        .probe =        stv680_probe,
        .disconnect =   stv680_disconnect,
        .id_table =     device_table
};
 
/********************************************************************
 *  Module routines
 ********************************************************************/
 
static int __init usb_stv680_init (void)
{
        if (usb_register (&stv680_driver) < 0) {
                PDEBUG (0, "STV(e): Could not setup STV0680 driver");
                return -1;
        }
        PDEBUG (0, "STV(i): usb camera driver version %s registering", DRIVER_VERSION);
 
        info(DRIVER_DESC " " DRIVER_VERSION);
        return 0;
}
 
static void __exit usb_stv680_exit (void)
{
        usb_deregister (&stv680_driver);
        PDEBUG (0, "STV(i): driver deregistered");
}
 
module_init (usb_stv680_init);
module_exit (usb_stv680_exit);
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [media/] [video/] [stv680.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* STV0680 USB Camera Driver, by Kevin Sisson (kjsisson@bellsouth.net)`
3			`*`
4			`* Thanks to STMicroelectronics for information on the usb commands, and`
5			`* to Steve Miller at STM for his help and encouragement while I was`
6			`* writing this driver.`
7			`*`
8			`* This driver is based heavily on the`
9			`* Endpoints (formerly known as AOX) se401 USB Camera Driver`
10			`* Copyright (c) 2000 Jeroen B. Vreeken (pe1rxq@amsat.org)`
11			`*`
12			`* Still somewhat based on the Linux ov511 driver.`
13			`*`
14			`* This program is free software; you can redistribute it and/or modify it`
15			`* under the terms of the GNU General Public License as published by the`
16			`* Free Software Foundation; either version 2 of the License, or (at your`
17			`* option) any later version.`
18			`*`
19			`* This program is distributed in the hope that it will be useful, but`
20			`* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY`
21			`* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
22			`* for more details.`
23			`*`
24			`* You should have received a copy of the GNU General Public License`
25			`* along with this program; if not, write to the Free Software Foundation,`
26			`* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.`
27			`*`
28			`* History:`
29			`* ver 0.1 October, 2001. Initial attempt.`
30			`*`
31			`* ver 0.2 November, 2001. Fixed asbility to resize, added brightness`
32			`* function, made more stable (?)`
33			`*`
34			`* ver 0.21 Nov, 2001. Added gamma correction and white balance,`
35			`* due to Alexander Schwartz. Still trying to`
36			`* improve stablility. Moved stuff into stv680.h`
37			`*`
38			`* ver 0.22 Nov, 2001. Added sharpen function (by Michael Sweet,`
39			`* mike@easysw.com) from GIMP, also used in pencam.`
40			`* Simple, fast, good integer math routine.`