spca5xx.c

应用于linux系统的usb接口的摄像头驱动

	PDEBUG(4, "destroying %s", name);
	remove_proc_entry(name, spca50x_proc_entry);
	spca50x->proc_entry = NULL;
    }

    /* destroy controlxx proc entry */
    if (spca50x->ctl_proc_entry != NULL) {
	sprintf(name, "control%d", spca50x->vdev->minor);
	PDEBUG(4, "destroying %s", name);
	remove_proc_entry(name, spca50x_proc_entry);
	spca50x->ctl_proc_entry = NULL;
    }

}

static void proc_spca50x_create(void)
{
    /* No current standard here. Alan prefers /proc/video/ as it keeps
     * /proc "less cluttered than /proc/randomcardifoundintheshed/"
     * -claudio
     */

#ifdef CONFIG_VIDEO_PROC_FS
    if (video_proc_entry == NULL) {
	err("Unable to initialise /proc/video/spca50x");
	return;
    }
    spca50x_proc_entry =
	create_proc_entry("spca50x", S_IFDIR, video_proc_entry);
#else				/* CONFIG_VIDEO_PROC_FS */
    spca50x_proc_entry = create_proc_entry("spca50x", S_IFDIR, 0);
#endif				/* CONFIG_VIDEO_PROC_FS */

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0)
    if (spca50x_proc_entry)
	spca50x_proc_entry->owner = THIS_MODULE;
    else
#ifdef CONFIG_VIDEO_PROC_FS
	err("Unable to initialise /proc/video/spca50x");
#else				/* CONFIG_VIDEO_PROC_FS */
	err("Unable to initialise /proc/spca50x");
#endif				/* CONFIG_VIDEO_PROC_FS */
#endif				/* LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0) */
}

static void proc_spca50x_destroy(void)
{
#ifdef CONFIG_VIDEO_PROC_FS
    PDEBUG(3, "removing /proc/video/spca50x");
#else				/* CONFIG_VIDEO_PROC_FS */
    PDEBUG(3, "removing /proc/spca50x");
#endif				/* CONFIG_VIDEO_PROC_FS */

    if (spca50x_proc_entry == NULL)
	return;

#ifdef CONFIG_VIDEO_PROC_FS
    remove_proc_entry("spca50x", video_proc_entry);
#else				/* CONFIG_VIDEO_PROC_FS */
    remove_proc_entry("spca50x", 0);
#endif				/* CONFIG_VIDEO_PROC_FS */
}
#endif				/* CONFIG_PROC_FS */


static int spca50x_set_packet_size(struct usb_spca50x *spca50x, int size)
{
    int alt;
	/**********************************************************************/
	/******** Try to find real Packet size from usb struct ****************/
    struct usb_device *dev = spca50x->dev;
    struct usb_interface_descriptor *interface = NULL;
    struct usb_config_descriptor *config = dev->actconfig;
    int mysize = 0;
    int ep = 0;


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

    if (size == 0)
	alt = SPCA50X_ALT_SIZE_0;
    else if (size == 128)
	alt = SPCA50X_ALT_SIZE_128;
    else if (size == 256)
	alt = SPCA50X_ALT_SIZE_256;
    else if (size == 384)
	alt = SPCA50X_ALT_SIZE_384;
    else if (size == 512)
	alt = SPCA50X_ALT_SIZE_512;
    else if (size == 640)
	alt = SPCA50X_ALT_SIZE_640;
    else if (size == 768)
	alt = SPCA50X_ALT_SIZE_768;
    else if (size == 896)
	alt = SPCA50X_ALT_SIZE_896;
    else if (size == 1000)
	alt = ETOMS_ALT_SIZE_1000;
    else if (size == 1023)
	if (spca50x->bridge == BRIDGE_SONIX ||
	    spca50x->bridge == BRIDGE_SN9CXXX ||
	    spca50x->bridge == BRIDGE_MR97311 ||
	    spca50x->bridge == BRIDGE_PAC207) {
	    alt = 8;
	} else {
	    alt = SPCA50X_ALT_SIZE_1023;
    } else {
	/* if an unrecognised size, default to the minimum */
	PDEBUG(5, "Set packet size: invalid size (%d), defaulting to %d",
	       size, SPCA50X_ALT_SIZE_128);
	alt = SPCA50X_ALT_SIZE_128;
    }


    PDEBUG(5, "iface alt size: %d %d %d", spca50x->iface, alt, size);
    if (usb_set_interface(spca50x->dev, spca50x->iface, alt) < 0) {
	err("Set packet size: set interface error");
	return -EBUSY;
    }
    /* check endpoint */
    if (spca50x->bridge == BRIDGE_PAC207) {
	ep = PAC207_ENDPOINT_ADDRESS - 1;
    } else {
	ep = SPCA50X_ENDPOINT_ADDRESS - 1;
    }

    interface = &config->interface[spca50x->iface].altsetting[alt];
    mysize = (interface->endpoint[ep].wMaxPacketSize);

    spca50x->packet_size = mysize & 0x03ff;
    spca50x->alt = alt;
    PDEBUG(1, "set real packet size: %d, alt=%d", mysize, alt);
    return 0;
}

/* Returns number of bits per pixel (regardless of where they are located; planar or
 * not), or zero for unsupported format.
 */
static int spca5xx_get_depth(struct usb_spca50x *spca50x, int palette)
{
    switch (palette) {
//      case VIDEO_PALETTE_GREY:     return 8;
    case VIDEO_PALETTE_RGB565:
	return 16;
    case VIDEO_PALETTE_RGB24:
	return 24;

//      case VIDEO_PALETTE_YUV422:   return 16;
 //   case VIDEO_PALETTE_YUYV:
//	return 16;
//      case VIDEO_PALETTE_YUV420:   return 24;
    case VIDEO_PALETTE_YUV420P:
	return 12;		/* strange need 12 this break the read method for this planar mode (6*8/4) */
//      case VIDEO_PALETTE_YUV422P:  return 24; /* Planar */

    case VIDEO_PALETTE_RGB32:
	return 32;
    case VIDEO_PALETTE_RAW_JPEG:
	return 24;		/* raw jpeg. what should we return ?? */
    case VIDEO_PALETTE_JPEG:
	if (spca50x->cameratype == JPEG ||
	    spca50x->cameratype == JPGH ||
	    spca50x->cameratype == JPGC ||
	    spca50x->cameratype == JPGS || 
	    spca50x->cameratype == JPGM) {
	    return 8;
	} else
	    return 0;
    default:
	return 0;		/* Invalid format */
    }
}

/**********************************************************************
* spca50x_isoc_irq
* Function processes the finish of the USB transfer by calling 
* spca50x_move_data function to move data from USB buffer to internal
* driver structures 
***********************************************************************/
static void spca50x_isoc_irq(struct urb *urb)
{
    int len;
    struct usb_spca50x *spca50x;

    if (!urb->context) {
	PDEBUG(4, "no context");
	return;
    }

    spca50x = (struct usb_spca50x *) urb->context;

    if (!spca50x->dev) {
	PDEBUG(4, "no device ");
	return;
    }
    if (!spca50x->user) {
	PDEBUG(4, "device not open");
	return;
    }
    if (!spca50x->streaming) {
	/* Always get some of these after close but before packet engine stops */
	PDEBUG(4, "hmmm... not streaming, but got interrupt");
	return;
    }
    if (!spca50x->present) {
	/*  */
	PDEBUG(4, "device disconnected ..., but got interrupt !!");
	return;
    }
    /* Copy the data received into our scratch buffer */
    if (spca50x->curframe >= 0) {
	len = spca50x_move_data(spca50x, urb);
    } else if (waitqueue_active(&spca50x->wq)) {
	wake_up_interruptible(&spca50x->wq);
    }

    /* Move to the next sbuf */
    spca50x->cursbuf = (spca50x->cursbuf + 1) % SPCA50X_NUMSBUF;

    urb->dev = spca50x->dev;
    urb->status = 0;

    return;
}


/**********************************************************************
* spca50x_init_isoc
* Function starts the ISO USB transfer by enabling this process
* from USB side and enabling ISO machine from the chip side
***********************************************************************/
static inline void spcaCameraStart(struct usb_spca50x *spca50x)
{
    int err_code;
    struct usb_device *dev = spca50x->dev;
    switch (spca50x->bridge) {
    case BRIDGE_SN9CXXX:
	sn9cxxx_start(spca50x);
	break;
    case BRIDGE_ETOMS:
	Et_startCamera(spca50x);
	break;
    case BRIDGE_CX11646:
	cx11646_start(spca50x);
	break;
    case BRIDGE_ZC3XX:
	zc3xx_start(spca50x);
	break;
    case BRIDGE_SONIX:
	sonix_start(spca50x);
	break;
    case BRIDGE_SPCA500:
	{
	    err_code = spca500_initialise(spca50x);
	    break;
	}

    case BRIDGE_SPCA501:
	{
	    /* Enable ISO packet machine CTRL reg=2,
	     * index=1 bitmask=0x2 (bit ordinal 1)
	     */
	    err_code = spca50x_reg_write(dev, SPCA501_REG_CTLRL,
					 (__u16) 0x1, (__u16) 0x2);
	    break;
	}

    case BRIDGE_SPCA504:
    case BRIDGE_SPCA504C:
    case BRIDGE_SPCA536:
    case BRIDGE_SPCA533:
    case BRIDGE_SPCA504B:
	{
	    sp5xxfw2_start(spca50x);
	    break;
	}
    case BRIDGE_SPCA506:
	spca506_start(spca50x);

	break;
    case BRIDGE_SPCA505:

	{
	    //nessesary because without it we can see stream only once after loading module
	    //stopping usb registers Tomasz change
	    spca50x_reg_write(dev, 0x2, 0x0, 0x0);

	    /* Enable ISO packet machine - should we do this here or in ISOC init ? */
	    err_code = spca50x_reg_write(dev, SPCA50X_REG_USB,
					 SPCA50X_USB_CTRL,
					 SPCA50X_CUSB_ENABLE);

//                      spca50x_reg_write(dev, 0x5, 0x0, 0x0);
//                      spca50x_reg_write(dev, 0x5, 0x0, 0x1);
//                      spca50x_reg_write(dev, 0x5, 0x11, 0x2);
	    break;
	}

    case BRIDGE_SPCA508:
	err_code = spca50x_reg_write(dev, 0, 0x8112, 0x10 | 0x20);
	break;
    case BRIDGE_SPCA561:
	{
	    /* Video ISO enable, Video Drop Packet enable: */
	    spca561_start(spca50x);
	    break;
	}
    case BRIDGE_TV8532:
	{
	    tv8532_start(spca50x);
	    break;
	}
    case BRIDGE_MR97311:
	{
	    pcam_start(spca50x);
	    break;
	}
    case BRIDGE_PAC207:
	{
	    pac207_start(spca50x);
	    break;
	}
    }

}

static inline void spcaCameraStop(struct usb_spca50x *spca50x)
{

    switch (spca50x->bridge) {
    case BRIDGE_SN9CXXX:
	sn9cxxx_stop(spca50x);
	break;
    case BRIDGE_ETOMS:
	Et_stopCamera(spca50x);
	break;
    case BRIDGE_CX11646:
	/* deferred after set_alt(0,0) 
	   cx11646_stop(spca50x); 
	 */
	break;
    case BRIDGE_ZC3XX:
	zc3xx_stop(spca50x);
	break;
    case BRIDGE_SONIX:
	sonix_stop(spca50x);
	break;
    case BRIDGE_SPCA500:
	{

	    break;
	}
    case BRIDGE_SPCA501:
	{
	    /* Disable ISO packet machine CTRL reg=2, index=1 bitmask=0x0 (bit ordinal 1) */
	    spca50x_reg_write(spca50x->dev, SPCA501_REG_CTLRL,
			      (__u16) 0x1, (__u16) 0x0);
	    break;
	}
    case BRIDGE_SPCA504C:
    case BRIDGE_SPCA504:
    case BRIDGE_SPCA536:
    case BRIDGE_SPCA533:
    case BRIDGE_SPCA504B:
	{
	    sp5xxfw2_stop(spca50x);
	    break;
	}
    case BRIDGE_SPCA505:
	{
	    spca50x_reg_write(spca50x->dev, 0x2, 0x0, 0x0);	//Disable ISO packet machine
	    break;
	}
    case BRIDGE_SPCA506:
	spca506_stop(spca50x);
	break;
    case BRIDGE_SPCA508:
	{
	    // Video ISO disable, Video Drop Packet enable:
	    spca50x_reg_write(spca50x->dev, 0, 0x8112, 0x20);
	    break;
	}
    case BRIDGE_SPCA561:
	{
	    // Video ISO disable, Video Drop Packet enable:
	    spca561_stop(spca50x);
	    break;
	}
    case BRIDGE_TV8532:
	{
	    tv8532_stop(spca50x);
	    break;
	}
    case BRIDGE_MR97311:
	{
	    pcam_stop(spca50x);
	    break;
	}
    case BRIDGE_PAC207:
	{
	    pac207_stop(spca50x);
	    break;
	}
    }

}
static int spca50x_init_isoc(struct usb_spca50x *spca50x)
{

    struct urb *urb;
    int fx, err, n;
    int intpipe;
    PDEBUG(3, "*** Initializing capture ***");