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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *      uvc_driver.c  --  USB Video Class driver
  *
  *      Copyright (C) 2005-2010
  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  */
 
 #include <linux/atomic.h>
 #include <linux/gpio/consumer.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/videodev2.h>
 #include <linux/vmalloc.h>
 #include <linux/wait.h>
 #include <asm/unaligned.h>
 
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
 
 #include "uvcvideo.h"
 
 #define DRIVER_AUTHOR       "Laurent Pinchart " \
                 "<laurent.pinchart@ideasonboard.com>"
 #define DRIVER_DESC     "USB Video Class driver"
 
 unsigned int uvc_clock_param = CLOCK_MONOTONIC;
 unsigned int uvc_hw_timestamps_param;
 unsigned int uvc_no_drop_param;
 static unsigned int uvc_quirks_param = -1;
 unsigned int uvc_dbg_param;
 unsigned int uvc_timeout_param = UVC_CTRL_STREAMING_TIMEOUT;
 
 /* ------------------------------------------------------------------------
  * Video formats
  */
 
 static struct uvc_format_desc uvc_fmts[] = {
     {
         .name       = "YUV 4:2:2 (YUYV)",
         .guid       = UVC_GUID_FORMAT_YUY2,
         .fcc        = V4L2_PIX_FMT_YUYV,
     },
     {
         .name       = "YUV 4:2:2 (YUYV)",
         .guid       = UVC_GUID_FORMAT_YUY2_ISIGHT,
         .fcc        = V4L2_PIX_FMT_YUYV,
     },
     {
         .name       = "YUV 4:2:0 (NV12)",
         .guid       = UVC_GUID_FORMAT_NV12,
         .fcc        = V4L2_PIX_FMT_NV12,
     },
     {
         .name       = "MJPEG",
         .guid       = UVC_GUID_FORMAT_MJPEG,
         .fcc        = V4L2_PIX_FMT_MJPEG,
     },
     {
         .name       = "YVU 4:2:0 (YV12)",
         .guid       = UVC_GUID_FORMAT_YV12,
         .fcc        = V4L2_PIX_FMT_YVU420,
     },
     {
         .name       = "YUV 4:2:0 (I420)",
         .guid       = UVC_GUID_FORMAT_I420,
         .fcc        = V4L2_PIX_FMT_YUV420,
     },
     {
         .name       = "YUV 4:2:0 (M420)",
         .guid       = UVC_GUID_FORMAT_M420,
         .fcc        = V4L2_PIX_FMT_M420,
     },
     {
         .name       = "YUV 4:2:2 (UYVY)",
         .guid       = UVC_GUID_FORMAT_UYVY,
         .fcc        = V4L2_PIX_FMT_UYVY,
     },
     {
         .name       = "Greyscale 8-bit (Y800)",
         .guid       = UVC_GUID_FORMAT_Y800,
         .fcc        = V4L2_PIX_FMT_GREY,
     },
     {
         .name       = "Greyscale 8-bit (Y8  )",
         .guid       = UVC_GUID_FORMAT_Y8,
         .fcc        = V4L2_PIX_FMT_GREY,
     },
     {
         .name       = "Greyscale 8-bit (D3DFMT_L8)",
         .guid       = UVC_GUID_FORMAT_D3DFMT_L8,
         .fcc        = V4L2_PIX_FMT_GREY,
     },
     {
         .name       = "IR 8-bit (L8_IR)",
         .guid       = UVC_GUID_FORMAT_KSMEDIA_L8_IR,
         .fcc        = V4L2_PIX_FMT_GREY,
     },
     {
         .name       = "Greyscale 10-bit (Y10 )",
         .guid       = UVC_GUID_FORMAT_Y10,
         .fcc        = V4L2_PIX_FMT_Y10,
     },
     {
         .name       = "Greyscale 12-bit (Y12 )",
         .guid       = UVC_GUID_FORMAT_Y12,
         .fcc        = V4L2_PIX_FMT_Y12,
     },
     {
         .name       = "Greyscale 16-bit (Y16 )",
         .guid       = UVC_GUID_FORMAT_Y16,
         .fcc        = V4L2_PIX_FMT_Y16,
     },
     {
         .name       = "BGGR Bayer (BY8 )",
         .guid       = UVC_GUID_FORMAT_BY8,
         .fcc        = V4L2_PIX_FMT_SBGGR8,
     },
     {
         .name       = "BGGR Bayer (BA81)",
         .guid       = UVC_GUID_FORMAT_BA81,
         .fcc        = V4L2_PIX_FMT_SBGGR8,
     },
     {
         .name       = "GBRG Bayer (GBRG)",
         .guid       = UVC_GUID_FORMAT_GBRG,
         .fcc        = V4L2_PIX_FMT_SGBRG8,
     },
     {
         .name       = "GRBG Bayer (GRBG)",
         .guid       = UVC_GUID_FORMAT_GRBG,
         .fcc        = V4L2_PIX_FMT_SGRBG8,
     },
     {
         .name       = "RGGB Bayer (RGGB)",
         .guid       = UVC_GUID_FORMAT_RGGB,
         .fcc        = V4L2_PIX_FMT_SRGGB8,
     },
     {
         .name       = "RGB565",
         .guid       = UVC_GUID_FORMAT_RGBP,
         .fcc        = V4L2_PIX_FMT_RGB565,
     },
     {
         .name       = "BGR 8:8:8 (BGR3)",
         .guid       = UVC_GUID_FORMAT_BGR3,
         .fcc        = V4L2_PIX_FMT_BGR24,
     },
     {
         .name       = "H.264",
         .guid       = UVC_GUID_FORMAT_H264,
         .fcc        = V4L2_PIX_FMT_H264,
     },
     {
         .name       = "H.265",
         .guid       = UVC_GUID_FORMAT_H265,
         .fcc        = V4L2_PIX_FMT_HEVC,
     },
     {
         .name       = "Greyscale 8 L/R (Y8I)",
         .guid       = UVC_GUID_FORMAT_Y8I,
         .fcc        = V4L2_PIX_FMT_Y8I,
     },
     {
         .name       = "Greyscale 12 L/R (Y12I)",
         .guid       = UVC_GUID_FORMAT_Y12I,
         .fcc        = V4L2_PIX_FMT_Y12I,
     },
     {
         .name       = "Depth data 16-bit (Z16)",
         .guid       = UVC_GUID_FORMAT_Z16,
         .fcc        = V4L2_PIX_FMT_Z16,
     },
     {
         .name       = "Bayer 10-bit (SRGGB10P)",
         .guid       = UVC_GUID_FORMAT_RW10,
         .fcc        = V4L2_PIX_FMT_SRGGB10P,
     },
     {
         .name       = "Bayer 16-bit (SBGGR16)",
         .guid       = UVC_GUID_FORMAT_BG16,
         .fcc        = V4L2_PIX_FMT_SBGGR16,
     },
     {
         .name       = "Bayer 16-bit (SGBRG16)",
         .guid       = UVC_GUID_FORMAT_GB16,
         .fcc        = V4L2_PIX_FMT_SGBRG16,
     },
     {
         .name       = "Bayer 16-bit (SRGGB16)",
         .guid       = UVC_GUID_FORMAT_RG16,
         .fcc        = V4L2_PIX_FMT_SRGGB16,
     },
     {
         .name       = "Bayer 16-bit (SGRBG16)",
         .guid       = UVC_GUID_FORMAT_GR16,
         .fcc        = V4L2_PIX_FMT_SGRBG16,
     },
     {
         .name       = "Depth data 16-bit (Z16)",
         .guid       = UVC_GUID_FORMAT_INVZ,
         .fcc        = V4L2_PIX_FMT_Z16,
     },
     {
         .name       = "Greyscale 10-bit (Y10 )",
         .guid       = UVC_GUID_FORMAT_INVI,
         .fcc        = V4L2_PIX_FMT_Y10,
     },
     {
         .name       = "IR:Depth 26-bit (INZI)",
         .guid       = UVC_GUID_FORMAT_INZI,
         .fcc        = V4L2_PIX_FMT_INZI,
     },
     {
         .name       = "4-bit Depth Confidence (Packed)",
         .guid       = UVC_GUID_FORMAT_CNF4,
         .fcc        = V4L2_PIX_FMT_CNF4,
     },
     {
         .name       = "HEVC",
         .guid       = UVC_GUID_FORMAT_HEVC,
         .fcc        = V4L2_PIX_FMT_HEVC,
     },
 };
 
 /* ------------------------------------------------------------------------
  * Utility functions
  */
 
 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
         u8 epaddr)
 {
     struct usb_host_endpoint *ep;
     unsigned int i;
 
     for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
         ep = &alts->endpoint[i];
         if (ep->desc.bEndpointAddress == epaddr)
             return ep;
     }
 
     return NULL;
 }
 
 static struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16])
 {
     unsigned int len = ARRAY_SIZE(uvc_fmts);
     unsigned int i;
 
     for (i = 0; i < len; ++i) {
         if (memcmp(guid, uvc_fmts[i].guid, 16) == 0)
             return &uvc_fmts[i];
     }
 
     return NULL;
 }
 
 static enum v4l2_colorspace uvc_colorspace(const u8 primaries)
 {
     static const enum v4l2_colorspace colorprimaries[] = {
         V4L2_COLORSPACE_SRGB,  /* Unspecified */
         V4L2_COLORSPACE_SRGB,
         V4L2_COLORSPACE_470_SYSTEM_M,
         V4L2_COLORSPACE_470_SYSTEM_BG,
         V4L2_COLORSPACE_SMPTE170M,
         V4L2_COLORSPACE_SMPTE240M,
     };
 
     if (primaries < ARRAY_SIZE(colorprimaries))
         return colorprimaries[primaries];
 
     return V4L2_COLORSPACE_SRGB;  /* Reserved */
 }
 
 static enum v4l2_xfer_func uvc_xfer_func(const u8 transfer_characteristics)
 {
     /*
      * V4L2 does not currently have definitions for all possible values of
      * UVC transfer characteristics. If v4l2_xfer_func is extended with new
      * values, the mapping below should be updated.
      *
      * Substitutions are taken from the mapping given for
      * V4L2_XFER_FUNC_DEFAULT documented in videodev2.h.
      */
     static const enum v4l2_xfer_func xfer_funcs[] = {
         V4L2_XFER_FUNC_DEFAULT,    /* Unspecified */
         V4L2_XFER_FUNC_709,
         V4L2_XFER_FUNC_709,        /* Substitution for BT.470-2 M */
         V4L2_XFER_FUNC_709,        /* Substitution for BT.470-2 B, G */
         V4L2_XFER_FUNC_709,        /* Substitution for SMPTE 170M */
         V4L2_XFER_FUNC_SMPTE240M,
         V4L2_XFER_FUNC_NONE,
         V4L2_XFER_FUNC_SRGB,
     };
 
     if (transfer_characteristics < ARRAY_SIZE(xfer_funcs))
         return xfer_funcs[transfer_characteristics];
 
     return V4L2_XFER_FUNC_DEFAULT;  /* Reserved */
 }
 
 static enum v4l2_ycbcr_encoding uvc_ycbcr_enc(const u8 matrix_coefficients)
 {
     /*
      * V4L2 does not currently have definitions for all possible values of
      * UVC matrix coefficients. If v4l2_ycbcr_encoding is extended with new
      * values, the mapping below should be updated.
      *
      * Substitutions are taken from the mapping given for
      * V4L2_YCBCR_ENC_DEFAULT documented in videodev2.h.
      *
      * FCC is assumed to be close enough to 601.
      */
     static const enum v4l2_ycbcr_encoding ycbcr_encs[] = {
         V4L2_YCBCR_ENC_DEFAULT,  /* Unspecified */
         V4L2_YCBCR_ENC_709,
         V4L2_YCBCR_ENC_601,      /* Substitution for FCC */
         V4L2_YCBCR_ENC_601,      /* Substitution for BT.470-2 B, G */
         V4L2_YCBCR_ENC_601,
         V4L2_YCBCR_ENC_SMPTE240M,
     };
 
     if (matrix_coefficients < ARRAY_SIZE(ycbcr_encs))
         return ycbcr_encs[matrix_coefficients];
 
     return V4L2_YCBCR_ENC_DEFAULT;  /* Reserved */
 }
 
 /*
  * Simplify a fraction using a simple continued fraction decomposition. The
  * idea here is to convert fractions such as 333333/10000000 to 1/30 using
  * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
  * arbitrary parameters to remove non-significative terms from the simple
  * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
  * respectively seems to give nice results.
  */
 void uvc_simplify_fraction(u32 *numerator, u32 *denominator,
         unsigned int n_terms, unsigned int threshold)
 {
     u32 *an;
     u32 x, y, r;
     unsigned int i, n;
 
     an = kmalloc_array(n_terms, sizeof(*an), GFP_KERNEL);
     if (an == NULL)
         return;
 
     /*
      * Convert the fraction to a simple continued fraction. See
      * https://en.wikipedia.org/wiki/Continued_fraction
      * Stop if the current term is bigger than or equal to the given
      * threshold.
      */
     x = *numerator;
     y = *denominator;
 
     for (n = 0; n < n_terms && y != 0; ++n) {
         an[n] = x / y;
         if (an[n] >= threshold) {
             if (n < 2)
                 n++;
             break;
         }
 
         r = x - an[n] * y;
         x = y;
         y = r;
     }
 
     /* Expand the simple continued fraction back to an integer fraction. */
     x = 0;
     y = 1;
 
     for (i = n; i > 0; --i) {
         r = y;
         y = an[i-1] * y + x;
         x = r;
     }
 
     *numerator = y;
     *denominator = x;
     kfree(an);
 }
 
 /*
  * Convert a fraction to a frame interval in 100ns multiples. The idea here is
  * to compute numerator / denominator * 10000000 using 32 bit fixed point
  * arithmetic only.
  */
 u32 uvc_fraction_to_interval(u32 numerator, u32 denominator)
 {
     u32 multiplier;
 
     /* Saturate the result if the operation would overflow. */
     if (denominator == 0 ||
         numerator/denominator >= ((u32)-1)/10000000)
         return (u32)-1;
 
     /*
      * Divide both the denominator and the multiplier by two until
      * numerator * multiplier doesn't overflow. If anyone knows a better
      * algorithm please let me know.
      */
     multiplier = 10000000;
     while (numerator > ((u32)-1)/multiplier) {
         multiplier /= 2;
         denominator /= 2;
     }
 
     return denominator ? numerator * multiplier / denominator : 0;
 }
 
 /* ------------------------------------------------------------------------
  * Terminal and unit management
  */
 
 struct uvc_entity *uvc_entity_by_id(struct uvc_device *dev, int id)
 {
     struct uvc_entity *entity;
 
     list_for_each_entry(entity, &dev->entities, list) {
         if (entity->id == id)
             return entity;
     }
 
     return NULL;
 }
 
 static struct uvc_entity *uvc_entity_by_reference(struct uvc_device *dev,
     int id, struct uvc_entity *entity)
 {
     unsigned int i;
 
     if (entity == NULL)
         entity = list_entry(&dev->entities, struct uvc_entity, list);
 
     list_for_each_entry_continue(entity, &dev->entities, list) {
         for (i = 0; i < entity->bNrInPins; ++i)
             if (entity->baSourceID[i] == id)
                 return entity;
     }
 
     return NULL;
 }
 
 static struct uvc_streaming *uvc_stream_by_id(struct uvc_device *dev, int id)
 {
     struct uvc_streaming *stream;
 
     list_for_each_entry(stream, &dev->streams, list) {
         if (stream->header.bTerminalLink == id)
             return stream;
     }
 
     return NULL;
 }
 
 /* ------------------------------------------------------------------------
  * Streaming Object Management
  */
 
 static void uvc_stream_delete(struct uvc_streaming *stream)
 {
     if (stream->async_wq)
         destroy_workqueue(stream->async_wq);
 
     mutex_destroy(&stream->mutex);
 
     usb_put_intf(stream->intf);
 
     kfree(stream->format);
     kfree(stream->header.bmaControls);
     kfree(stream);
 }
 
 static struct uvc_streaming *uvc_stream_new(struct uvc_device *dev,
                         struct usb_interface *intf)
 {
     struct uvc_streaming *stream;
 
     stream = kzalloc(sizeof(*stream), GFP_KERNEL);
     if (stream == NULL)
         return NULL;
 
     mutex_init(&stream->mutex);
 
     stream->dev = dev;
     stream->intf = usb_get_intf(intf);
     stream->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
 
     /* Allocate a stream specific work queue for asynchronous tasks. */
     stream->async_wq = alloc_workqueue("uvcvideo", WQ_UNBOUND | WQ_HIGHPRI,
                        0);
     if (!stream->async_wq) {
         uvc_stream_delete(stream);
         return NULL;
     }
 
     return stream;
 }
 
 /* ------------------------------------------------------------------------
  * Descriptors parsing
  */
 
 static int uvc_parse_format(struct uvc_device *dev,
     struct uvc_streaming *streaming, struct uvc_format *format,
     u32 **intervals, unsigned char *buffer, int buflen)
 {
     struct usb_interface *intf = streaming->intf;
     struct usb_host_interface *alts = intf->cur_altsetting;
     struct uvc_format_desc *fmtdesc;
     struct uvc_frame *frame;
     const unsigned char *start = buffer;
     unsigned int width_multiplier = 1;
     unsigned int interval;
     unsigned int i, n;
     u8 ftype;
 
     format->type = buffer[2];
     format->index = buffer[3];
 
     switch (buffer[2]) {
     case UVC_VS_FORMAT_UNCOMPRESSED:
     case UVC_VS_FORMAT_FRAME_BASED:
         n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
         if (buflen < n) {
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d FORMAT error\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         /* Find the format descriptor from its GUID. */
         fmtdesc = uvc_format_by_guid(&buffer[5]);
 
         if (fmtdesc != NULL) {
             strscpy(format->name, fmtdesc->name,
                 sizeof(format->name));
             format->fcc = fmtdesc->fcc;
         } else {
             dev_info(&streaming->intf->dev,
                  "Unknown video format %pUl\n", &buffer[5]);
             snprintf(format->name, sizeof(format->name), "%pUl\n",
                 &buffer[5]);
             format->fcc = 0;
         }
 
         format->bpp = buffer[21];
 
         /*
          * Some devices report a format that doesn't match what they
          * really send.
          */
         if (dev->quirks & UVC_QUIRK_FORCE_Y8) {
             if (format->fcc == V4L2_PIX_FMT_YUYV) {
                 strscpy(format->name, "Greyscale 8-bit (Y8  )",
                     sizeof(format->name));
                 format->fcc = V4L2_PIX_FMT_GREY;
                 format->bpp = 8;
                 width_multiplier = 2;
             }
         }
 
         /* Some devices report bpp that doesn't match the format. */
         if (dev->quirks & UVC_QUIRK_FORCE_BPP) {
             const struct v4l2_format_info *info =
                 v4l2_format_info(format->fcc);
 
             if (info) {
                 unsigned int div = info->hdiv * info->vdiv;
 
                 n = info->bpp[0] * div;
                 for (i = 1; i < info->comp_planes; i++)
                     n += info->bpp[i];
 
                 format->bpp = DIV_ROUND_UP(8 * n, div);
             }
         }
 
         if (buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED) {
             ftype = UVC_VS_FRAME_UNCOMPRESSED;
         } else {
             ftype = UVC_VS_FRAME_FRAME_BASED;
             if (buffer[27])
                 format->flags = UVC_FMT_FLAG_COMPRESSED;
         }
         break;
 
     case UVC_VS_FORMAT_MJPEG:
         if (buflen < 11) {
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d FORMAT error\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         strscpy(format->name, "MJPEG", sizeof(format->name));
         format->fcc = V4L2_PIX_FMT_MJPEG;
         format->flags = UVC_FMT_FLAG_COMPRESSED;
         format->bpp = 0;
         ftype = UVC_VS_FRAME_MJPEG;
         break;
 
     case UVC_VS_FORMAT_DV:
         if (buflen < 9) {
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d FORMAT error\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         switch (buffer[8] & 0x7f) {
         case 0:
             strscpy(format->name, "SD-DV", sizeof(format->name));
             break;
         case 1:
             strscpy(format->name, "SDL-DV", sizeof(format->name));
             break;
         case 2:
             strscpy(format->name, "HD-DV", sizeof(format->name));
             break;
         default:
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d: unknown DV format %u\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber, buffer[8]);
             return -EINVAL;
         }
 
         strlcat(format->name, buffer[8] & (1 << 7) ? " 60Hz" : " 50Hz",
             sizeof(format->name));
 
         format->fcc = V4L2_PIX_FMT_DV;
         format->flags = UVC_FMT_FLAG_COMPRESSED | UVC_FMT_FLAG_STREAM;
         format->bpp = 0;
         ftype = 0;
 
         /* Create a dummy frame descriptor. */
         frame = &format->frame[0];
         memset(&format->frame[0], 0, sizeof(format->frame[0]));
         frame->bFrameIntervalType = 1;
         frame->dwDefaultFrameInterval = 1;
         frame->dwFrameInterval = *intervals;
         *(*intervals)++ = 1;
         format->nframes = 1;
         break;
 
     case UVC_VS_FORMAT_MPEG2TS:
     case UVC_VS_FORMAT_STREAM_BASED:
         /* Not supported yet. */
     default:
         uvc_dbg(dev, DESCR,
             "device %d videostreaming interface %d unsupported format %u\n",
             dev->udev->devnum, alts->desc.bInterfaceNumber,
             buffer[2]);
         return -EINVAL;
     }
 
     uvc_dbg(dev, DESCR, "Found format %s\n", format->name);
 
     buflen -= buffer[0];
     buffer += buffer[0];
 
     /*
      * Parse the frame descriptors. Only uncompressed, MJPEG and frame
      * based formats have frame descriptors.
      */
     while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
            buffer[2] == ftype) {
         frame = &format->frame[format->nframes];
         if (ftype != UVC_VS_FRAME_FRAME_BASED)
             n = buflen > 25 ? buffer[25] : 0;
         else
             n = buflen > 21 ? buffer[21] : 0;
 
         n = n ? n : 3;
 
         if (buflen < 26 + 4*n) {
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d FRAME error\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         frame->bFrameIndex = buffer[3];
         frame->bmCapabilities = buffer[4];
         frame->wWidth = get_unaligned_le16(&buffer[5])
                   * width_multiplier;
         frame->wHeight = get_unaligned_le16(&buffer[7]);
         frame->dwMinBitRate = get_unaligned_le32(&buffer[9]);
         frame->dwMaxBitRate = get_unaligned_le32(&buffer[13]);
         if (ftype != UVC_VS_FRAME_FRAME_BASED) {
             frame->dwMaxVideoFrameBufferSize =
                 get_unaligned_le32(&buffer[17]);
             frame->dwDefaultFrameInterval =
                 get_unaligned_le32(&buffer[21]);
             frame->bFrameIntervalType = buffer[25];
         } else {
             frame->dwMaxVideoFrameBufferSize = 0;
             frame->dwDefaultFrameInterval =
                 get_unaligned_le32(&buffer[17]);
             frame->bFrameIntervalType = buffer[21];
         }
         frame->dwFrameInterval = *intervals;
 
         /*
          * Several UVC chipsets screw up dwMaxVideoFrameBufferSize
          * completely. Observed behaviours range from setting the
          * value to 1.1x the actual frame size to hardwiring the
          * 16 low bits to 0. This results in a higher than necessary
          * memory usage as well as a wrong image size information. For
          * uncompressed formats this can be fixed by computing the
          * value from the frame size.
          */
         if (!(format->flags & UVC_FMT_FLAG_COMPRESSED))
             frame->dwMaxVideoFrameBufferSize = format->bpp
                 * frame->wWidth * frame->wHeight / 8;
 
         /*
          * Some bogus devices report dwMinFrameInterval equal to
          * dwMaxFrameInterval and have dwFrameIntervalStep set to
          * zero. Setting all null intervals to 1 fixes the problem and
          * some other divisions by zero that could happen.
          */
         for (i = 0; i < n; ++i) {
             interval = get_unaligned_le32(&buffer[26+4*i]);
             *(*intervals)++ = interval ? interval : 1;
         }
 
         /*
          * Make sure that the default frame interval stays between
          * the boundaries.
          */
         n -= frame->bFrameIntervalType ? 1 : 2;
         frame->dwDefaultFrameInterval =
             min(frame->dwFrameInterval[n],
                 max(frame->dwFrameInterval[0],
                 frame->dwDefaultFrameInterval));
 
         if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
             frame->bFrameIntervalType = 1;
             frame->dwFrameInterval[0] =
                 frame->dwDefaultFrameInterval;
         }
 
         uvc_dbg(dev, DESCR, "- %ux%u (%u.%u fps)\n",
             frame->wWidth, frame->wHeight,
             10000000 / frame->dwDefaultFrameInterval,
             (100000000 / frame->dwDefaultFrameInterval) % 10);
 
         format->nframes++;
         buflen -= buffer[0];
         buffer += buffer[0];
     }
 
     if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
         buffer[2] == UVC_VS_STILL_IMAGE_FRAME) {
         buflen -= buffer[0];
         buffer += buffer[0];
     }
 
     if (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE &&
         buffer[2] == UVC_VS_COLORFORMAT) {
         if (buflen < 6) {
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d COLORFORMAT error\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         format->colorspace = uvc_colorspace(buffer[3]);
         format->xfer_func = uvc_xfer_func(buffer[4]);
         format->ycbcr_enc = uvc_ycbcr_enc(buffer[5]);
 
         buflen -= buffer[0];
         buffer += buffer[0];
     } else {
         format->colorspace = V4L2_COLORSPACE_SRGB;
     }
 
     return buffer - start;
 }
 
 static int uvc_parse_streaming(struct uvc_device *dev,
     struct usb_interface *intf)
 {
     struct uvc_streaming *streaming = NULL;
     struct uvc_format *format;
     struct uvc_frame *frame;
     struct usb_host_interface *alts = &intf->altsetting[0];
     unsigned char *_buffer, *buffer = alts->extra;
     int _buflen, buflen = alts->extralen;
     unsigned int nformats = 0, nframes = 0, nintervals = 0;
     unsigned int size, i, n, p;
     u32 *interval;
     u16 psize;
     int ret = -EINVAL;
 
     if (intf->cur_altsetting->desc.bInterfaceSubClass
         != UVC_SC_VIDEOSTREAMING) {
         uvc_dbg(dev, DESCR,
             "device %d interface %d isn't a video streaming interface\n",
             dev->udev->devnum,
             intf->altsetting[0].desc.bInterfaceNumber);
         return -EINVAL;
     }
 
     if (usb_driver_claim_interface(&uvc_driver.driver, intf, dev)) {
         uvc_dbg(dev, DESCR,
             "device %d interface %d is already claimed\n",
             dev->udev->devnum,
             intf->altsetting[0].desc.bInterfaceNumber);
         return -EINVAL;
     }
 
     streaming = uvc_stream_new(dev, intf);
     if (streaming == NULL) {
         usb_driver_release_interface(&uvc_driver.driver, intf);
         return -ENOMEM;
     }
 
     /*
      * The Pico iMage webcam has its class-specific interface descriptors
      * after the endpoint descriptors.
      */
     if (buflen == 0) {
         for (i = 0; i < alts->desc.bNumEndpoints; ++i) {
             struct usb_host_endpoint *ep = &alts->endpoint[i];
 
             if (ep->extralen == 0)
                 continue;
 
             if (ep->extralen > 2 &&
                 ep->extra[1] == USB_DT_CS_INTERFACE) {
                 uvc_dbg(dev, DESCR,
                     "trying extra data from endpoint %u\n",
                     i);
                 buffer = alts->endpoint[i].extra;
                 buflen = alts->endpoint[i].extralen;
                 break;
             }
         }
     }
 
     /* Skip the standard interface descriptors. */
     while (buflen > 2 && buffer[1] != USB_DT_CS_INTERFACE) {
         buflen -= buffer[0];
         buffer += buffer[0];
     }
 
     if (buflen <= 2) {
         uvc_dbg(dev, DESCR,
             "no class-specific streaming interface descriptors found\n");
         goto error;
     }
 
     /* Parse the header descriptor. */
     switch (buffer[2]) {
     case UVC_VS_OUTPUT_HEADER:
         streaming->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
         size = 9;
         break;
 
     case UVC_VS_INPUT_HEADER:
         streaming->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
         size = 13;
         break;
 
     default:
         uvc_dbg(dev, DESCR,
             "device %d videostreaming interface %d HEADER descriptor not found\n",
             dev->udev->devnum, alts->desc.bInterfaceNumber);
         goto error;
     }
 
     p = buflen >= 4 ? buffer[3] : 0;
     n = buflen >= size ? buffer[size-1] : 0;
 
     if (buflen < size + p*n) {
         uvc_dbg(dev, DESCR,
             "device %d videostreaming interface %d HEADER descriptor is invalid\n",
             dev->udev->devnum, alts->desc.bInterfaceNumber);
         goto error;
     }
 
     streaming->header.bNumFormats = p;
     streaming->header.bEndpointAddress = buffer[6];
     if (buffer[2] == UVC_VS_INPUT_HEADER) {
         streaming->header.bmInfo = buffer[7];
         streaming->header.bTerminalLink = buffer[8];
         streaming->header.bStillCaptureMethod = buffer[9];
         streaming->header.bTriggerSupport = buffer[10];
         streaming->header.bTriggerUsage = buffer[11];
     } else {
         streaming->header.bTerminalLink = buffer[7];
     }
     streaming->header.bControlSize = n;
 
     streaming->header.bmaControls = kmemdup(&buffer[size], p * n,
                         GFP_KERNEL);
     if (streaming->header.bmaControls == NULL) {
         ret = -ENOMEM;
         goto error;
     }
 
     buflen -= buffer[0];
     buffer += buffer[0];
 
     _buffer = buffer;
     _buflen = buflen;
 
     /* Count the format and frame descriptors. */
     while (_buflen > 2 && _buffer[1] == USB_DT_CS_INTERFACE) {
         switch (_buffer[2]) {
         case UVC_VS_FORMAT_UNCOMPRESSED:
         case UVC_VS_FORMAT_MJPEG:
         case UVC_VS_FORMAT_FRAME_BASED:
             nformats++;
             break;
 
         case UVC_VS_FORMAT_DV:
             /*
              * DV format has no frame descriptor. We will create a
              * dummy frame descriptor with a dummy frame interval.
              */
             nformats++;
             nframes++;
             nintervals++;
             break;
 
         case UVC_VS_FORMAT_MPEG2TS:
         case UVC_VS_FORMAT_STREAM_BASED:
             uvc_dbg(dev, DESCR,
                 "device %d videostreaming interface %d FORMAT %u is not supported\n",
                 dev->udev->devnum,
                 alts->desc.bInterfaceNumber, _buffer[2]);
             break;
 
         case UVC_VS_FRAME_UNCOMPRESSED:
         case UVC_VS_FRAME_MJPEG:
             nframes++;
             if (_buflen > 25)
                 nintervals += _buffer[25] ? _buffer[25] : 3;
             break;
 
         case UVC_VS_FRAME_FRAME_BASED:
             nframes++;
             if (_buflen > 21)
                 nintervals += _buffer[21] ? _buffer[21] : 3;
             break;
         }
 
         _buflen -= _buffer[0];
         _buffer += _buffer[0];
     }
 
     if (nformats == 0) {
         uvc_dbg(dev, DESCR,
             "device %d videostreaming interface %d has no supported formats defined\n",
             dev->udev->devnum, alts->desc.bInterfaceNumber);
         goto error;
     }
 
     size = nformats * sizeof(*format) + nframes * sizeof(*frame)
          + nintervals * sizeof(*interval);
     format = kzalloc(size, GFP_KERNEL);
     if (format == NULL) {
         ret = -ENOMEM;
         goto error;
     }
 
     frame = (struct uvc_frame *)&format[nformats];
     interval = (u32 *)&frame[nframes];
 
     streaming->format = format;
     streaming->nformats = nformats;
 
     /* Parse the format descriptors. */
     while (buflen > 2 && buffer[1] == USB_DT_CS_INTERFACE) {
         switch (buffer[2]) {
         case UVC_VS_FORMAT_UNCOMPRESSED:
         case UVC_VS_FORMAT_MJPEG:
         case UVC_VS_FORMAT_DV:
         case UVC_VS_FORMAT_FRAME_BASED:
             format->frame = frame;
             ret = uvc_parse_format(dev, streaming, format,
                 &interval, buffer, buflen);
             if (ret < 0)
                 goto error;
 
             frame += format->nframes;
             format++;
 
             buflen -= ret;
             buffer += ret;
             continue;
 
         default:
             break;
         }
 
         buflen -= buffer[0];
         buffer += buffer[0];
     }
 
     if (buflen)
         uvc_dbg(dev, DESCR,
             "device %d videostreaming interface %d has %u bytes of trailing descriptor garbage\n",
             dev->udev->devnum, alts->desc.bInterfaceNumber, buflen);
 
     /* Parse the alternate settings to find the maximum bandwidth. */
     for (i = 0; i < intf->num_altsetting; ++i) {
         struct usb_host_endpoint *ep;
         alts = &intf->altsetting[i];
         ep = uvc_find_endpoint(alts,
                 streaming->header.bEndpointAddress);
         if (ep == NULL)
             continue;
         psize = uvc_endpoint_max_bpi(dev->udev, ep);
         if (psize > streaming->maxpsize)
             streaming->maxpsize = psize;
     }
 
     list_add_tail(&streaming->list, &dev->streams);
     return 0;
 
 error:
     usb_driver_release_interface(&uvc_driver.driver, intf);
     uvc_stream_delete(streaming);
     return ret;
 }
 
 static const u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
 static const u8 uvc_gpio_guid[16] = UVC_GUID_EXT_GPIO_CONTROLLER;
 static const u8 uvc_media_transport_input_guid[16] =
     UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
 static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 
 static struct uvc_entity *uvc_alloc_entity(u16 type, u16 id,
         unsigned int num_pads, unsigned int extra_size)
 {
     struct uvc_entity *entity;
     unsigned int num_inputs;
     unsigned int size;
     unsigned int i;
 
     extra_size = roundup(extra_size, sizeof(*entity->pads));
     if (num_pads)
         num_inputs = type & UVC_TERM_OUTPUT ? num_pads : num_pads - 1;
     else
         num_inputs = 0;
     size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads
          + num_inputs;
     entity = kzalloc(size, GFP_KERNEL);
     if (entity == NULL)
         return NULL;
 
     entity->id = id;
     entity->type = type;
 
     /*
      * Set the GUID for standard entity types. For extension units, the GUID
      * is initialized by the caller.
      */
     switch (type) {
     case UVC_EXT_GPIO_UNIT:
         memcpy(entity->guid, uvc_gpio_guid, 16);
         break;
     case UVC_ITT_CAMERA:
         memcpy(entity->guid, uvc_camera_guid, 16);
         break;
     case UVC_ITT_MEDIA_TRANSPORT_INPUT:
         memcpy(entity->guid, uvc_media_transport_input_guid, 16);
         break;
     case UVC_VC_PROCESSING_UNIT:
         memcpy(entity->guid, uvc_processing_guid, 16);
         break;
     }
 
     entity->num_links = 0;
     entity->num_pads = num_pads;
     entity->pads = ((void *)(entity + 1)) + extra_size;
 
     for (i = 0; i < num_inputs; ++i)
         entity->pads[i].flags = MEDIA_PAD_FL_SINK;
     if (!UVC_ENTITY_IS_OTERM(entity) && num_pads)
         entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE;
 
     entity->bNrInPins = num_inputs;
     entity->baSourceID = (u8 *)(&entity->pads[num_pads]);
 
     return entity;
 }
 
 /* Parse vendor-specific extensions. */
 static int uvc_parse_vendor_control(struct uvc_device *dev,
     const unsigned char *buffer, int buflen)
 {
     struct usb_device *udev = dev->udev;
     struct usb_host_interface *alts = dev->intf->cur_altsetting;
     struct uvc_entity *unit;
     unsigned int n, p;
     int handled = 0;
 
     switch (le16_to_cpu(dev->udev->descriptor.idVendor)) {
     case 0x046d:        /* Logitech */
         if (buffer[1] != 0x41 || buffer[2] != 0x01)
             break;
 
         /*
          * Logitech implements several vendor specific functions
          * through vendor specific extension units (LXU).
          *
          * The LXU descriptors are similar to XU descriptors
          * (see "USB Device Video Class for Video Devices", section
          * 3.7.2.6 "Extension Unit Descriptor") with the following
          * differences:
          *
          * ----------------------------------------------------------
          * 0        bLength     1    Number
          *  Size of this descriptor, in bytes: 24+p+n*2
          * ----------------------------------------------------------
          * 23+p+n   bmControlsType  N   Bitmap
          *  Individual bits in the set are defined:
          *  0: Absolute
          *  1: Relative
          *
          *  This bitset is mapped exactly the same as bmControls.
          * ----------------------------------------------------------
          * 23+p+n*2 bReserved   1   Boolean
          * ----------------------------------------------------------
          * 24+p+n*2 iExtension  1   Index
          *  Index of a string descriptor that describes this
          *  extension unit.
          * ----------------------------------------------------------
          */
         p = buflen >= 22 ? buffer[21] : 0;
         n = buflen >= 25 + p ? buffer[22+p] : 0;
 
         if (buflen < 25 + p + 2*n) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d EXTENSION_UNIT error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             break;
         }
 
         unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
                     p + 1, 2*n);
         if (unit == NULL)
             return -ENOMEM;
 
         memcpy(unit->guid, &buffer[4], 16);
         unit->extension.bNumControls = buffer[20];
         memcpy(unit->baSourceID, &buffer[22], p);
         unit->extension.bControlSize = buffer[22+p];
         unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
         unit->extension.bmControlsType = (u8 *)unit + sizeof(*unit)
                            + n;
         memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
 
         if (buffer[24+p+2*n] != 0)
             usb_string(udev, buffer[24+p+2*n], unit->name,
                    sizeof(unit->name));
         else
             sprintf(unit->name, "Extension %u", buffer[3]);
 
         list_add_tail(&unit->list, &dev->entities);
         handled = 1;
         break;
     }
 
     return handled;
 }
 
 static int uvc_parse_standard_control(struct uvc_device *dev,
     const unsigned char *buffer, int buflen)
 {
     struct usb_device *udev = dev->udev;
     struct uvc_entity *unit, *term;
     struct usb_interface *intf;
     struct usb_host_interface *alts = dev->intf->cur_altsetting;
     unsigned int i, n, p, len;
     u16 type;
 
     switch (buffer[2]) {
     case UVC_VC_HEADER:
         n = buflen >= 12 ? buffer[11] : 0;
 
         if (buflen < 12 + n) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d HEADER error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         dev->uvc_version = get_unaligned_le16(&buffer[3]);
         dev->clock_frequency = get_unaligned_le32(&buffer[7]);
 
         /* Parse all USB Video Streaming interfaces. */
         for (i = 0; i < n; ++i) {
             intf = usb_ifnum_to_if(udev, buffer[12+i]);
             if (intf == NULL) {
                 uvc_dbg(dev, DESCR,
                     "device %d interface %d doesn't exists\n",
                     udev->devnum, i);
                 continue;
             }
 
             uvc_parse_streaming(dev, intf);
         }
         break;
 
     case UVC_VC_INPUT_TERMINAL:
         if (buflen < 8) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d INPUT_TERMINAL error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         /*
          * Reject invalid terminal types that would cause issues:
          *
          * - The high byte must be non-zero, otherwise it would be
          *   confused with a unit.
          *
          * - Bit 15 must be 0, as we use it internally as a terminal
          *   direction flag.
          *
          * Other unknown types are accepted.
          */
         type = get_unaligned_le16(&buffer[4]);
         if ((type & 0x7f00) == 0 || (type & 0x8000) != 0) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d INPUT_TERMINAL %d has invalid type 0x%04x, skipping\n",
                 udev->devnum, alts->desc.bInterfaceNumber,
                 buffer[3], type);
             return 0;
         }
 
         n = 0;
         p = 0;
         len = 8;
 
         if (type == UVC_ITT_CAMERA) {
             n = buflen >= 15 ? buffer[14] : 0;
             len = 15;
 
         } else if (type == UVC_ITT_MEDIA_TRANSPORT_INPUT) {
             n = buflen >= 9 ? buffer[8] : 0;
             p = buflen >= 10 + n ? buffer[9+n] : 0;
             len = 10;
         }
 
         if (buflen < len + n + p) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d INPUT_TERMINAL error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
                     1, n + p);
         if (term == NULL)
             return -ENOMEM;
 
         if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
             term->camera.bControlSize = n;
             term->camera.bmControls = (u8 *)term + sizeof(*term);
             term->camera.wObjectiveFocalLengthMin =
                 get_unaligned_le16(&buffer[8]);
             term->camera.wObjectiveFocalLengthMax =
                 get_unaligned_le16(&buffer[10]);
             term->camera.wOcularFocalLength =
                 get_unaligned_le16(&buffer[12]);
             memcpy(term->camera.bmControls, &buffer[15], n);
         } else if (UVC_ENTITY_TYPE(term) ==
                UVC_ITT_MEDIA_TRANSPORT_INPUT) {
             term->media.bControlSize = n;
             term->media.bmControls = (u8 *)term + sizeof(*term);
             term->media.bTransportModeSize = p;
             term->media.bmTransportModes = (u8 *)term
                              + sizeof(*term) + n;
             memcpy(term->media.bmControls, &buffer[9], n);
             memcpy(term->media.bmTransportModes, &buffer[10+n], p);
         }
 
         if (buffer[7] != 0)
             usb_string(udev, buffer[7], term->name,
                    sizeof(term->name));
         else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
             sprintf(term->name, "Camera %u", buffer[3]);
         else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
             sprintf(term->name, "Media %u", buffer[3]);
         else
             sprintf(term->name, "Input %u", buffer[3]);
 
         list_add_tail(&term->list, &dev->entities);
         break;
 
     case UVC_VC_OUTPUT_TERMINAL:
         if (buflen < 9) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d OUTPUT_TERMINAL error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         /*
          * Make sure the terminal type MSB is not null, otherwise it
          * could be confused with a unit.
          */
         type = get_unaligned_le16(&buffer[4]);
         if ((type & 0xff00) == 0) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d OUTPUT_TERMINAL %d has invalid type 0x%04x, skipping\n",
                 udev->devnum, alts->desc.bInterfaceNumber,
                 buffer[3], type);
             return 0;
         }
 
         term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
                     1, 0);
         if (term == NULL)
             return -ENOMEM;
 
         memcpy(term->baSourceID, &buffer[7], 1);
 
         if (buffer[8] != 0)
             usb_string(udev, buffer[8], term->name,
                    sizeof(term->name));
         else
             sprintf(term->name, "Output %u", buffer[3]);
 
         list_add_tail(&term->list, &dev->entities);
         break;
 
     case UVC_VC_SELECTOR_UNIT:
         p = buflen >= 5 ? buffer[4] : 0;
 
         if (buflen < 5 || buflen < 6 + p) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d SELECTOR_UNIT error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
         if (unit == NULL)
             return -ENOMEM;
 
         memcpy(unit->baSourceID, &buffer[5], p);
 
         if (buffer[5+p] != 0)
             usb_string(udev, buffer[5+p], unit->name,
                    sizeof(unit->name));
         else
             sprintf(unit->name, "Selector %u", buffer[3]);
 
         list_add_tail(&unit->list, &dev->entities);
         break;
 
     case UVC_VC_PROCESSING_UNIT:
         n = buflen >= 8 ? buffer[7] : 0;
         p = dev->uvc_version >= 0x0110 ? 10 : 9;
 
         if (buflen < p + n) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d PROCESSING_UNIT error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
         if (unit == NULL)
             return -ENOMEM;
 
         memcpy(unit->baSourceID, &buffer[4], 1);
         unit->processing.wMaxMultiplier =
             get_unaligned_le16(&buffer[5]);
         unit->processing.bControlSize = buffer[7];
         unit->processing.bmControls = (u8 *)unit + sizeof(*unit);
         memcpy(unit->processing.bmControls, &buffer[8], n);
         if (dev->uvc_version >= 0x0110)
             unit->processing.bmVideoStandards = buffer[9+n];
 
         if (buffer[8+n] != 0)
             usb_string(udev, buffer[8+n], unit->name,
                    sizeof(unit->name));
         else
             sprintf(unit->name, "Processing %u", buffer[3]);
 
         list_add_tail(&unit->list, &dev->entities);
         break;
 
     case UVC_VC_EXTENSION_UNIT:
         p = buflen >= 22 ? buffer[21] : 0;
         n = buflen >= 24 + p ? buffer[22+p] : 0;
 
         if (buflen < 24 + p + n) {
             uvc_dbg(dev, DESCR,
                 "device %d videocontrol interface %d EXTENSION_UNIT error\n",
                 udev->devnum, alts->desc.bInterfaceNumber);
             return -EINVAL;
         }
 
         unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
         if (unit == NULL)
             return -ENOMEM;
 
         memcpy(unit->guid, &buffer[4], 16);
         unit->extension.bNumControls = buffer[20];
         memcpy(unit->baSourceID, &buffer[22], p);
         unit->extension.bControlSize = buffer[22+p];
         unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
         memcpy(unit->extension.bmControls, &buffer[23+p], n);
 
         if (buffer[23+p+n] != 0)
             usb_string(udev, buffer[23+p+n], unit->name,
                    sizeof(unit->name));
         else
             sprintf(unit->name, "Extension %u", buffer[3]);
 
         list_add_tail(&unit->list, &dev->entities);
         break;
 
     default:
         uvc_dbg(dev, DESCR,
             "Found an unknown CS_INTERFACE descriptor (%u)\n",
             buffer[2]);
         break;
     }
 
     return 0;
 }
 
 static int uvc_parse_control(struct uvc_device *dev)
 {
     struct usb_host_interface *alts = dev->intf->cur_altsetting;
     unsigned char *buffer = alts->extra;
     int buflen = alts->extralen;
     int ret;
 
     /*
      * Parse the default alternate setting only, as the UVC specification
      * defines a single alternate setting, the default alternate setting
      * zero.
      */
 
     while (buflen > 2) {
         if (uvc_parse_vendor_control(dev, buffer, buflen) ||
             buffer[1] != USB_DT_CS_INTERFACE)
             goto next_descriptor;
 
         if ((ret = uvc_parse_standard_control(dev, buffer, buflen)) < 0)
             return ret;
 
 next_descriptor:
         buflen -= buffer[0];
         buffer += buffer[0];
     }
 
     /*
      * Check if the optional status endpoint is present. Built-in iSight
      * webcams have an interrupt endpoint but spit proprietary data that
      * don't conform to the UVC status endpoint messages. Don't try to
      * handle the interrupt endpoint for those cameras.
      */
     if (alts->desc.bNumEndpoints == 1 &&
         !(dev->quirks & UVC_QUIRK_BUILTIN_ISIGHT)) {
         struct usb_host_endpoint *ep = &alts->endpoint[0];
         struct usb_endpoint_descriptor *desc = &ep->desc;
 
         if (usb_endpoint_is_int_in(desc) &&
             le16_to_cpu(desc->wMaxPacketSize) >= 8 &&
             desc->bInterval != 0) {
             uvc_dbg(dev, DESCR,
                 "Found a Status endpoint (addr %02x)\n",
                 desc->bEndpointAddress);
             dev->int_ep = ep;
         }
     }
 
     return 0;
 }
 
 /* -----------------------------------------------------------------------------
  * Privacy GPIO
  */
 
 static void uvc_gpio_event(struct uvc_device *dev)
 {
     struct uvc_entity *unit = dev->gpio_unit;
     struct uvc_video_chain *chain;
     u8 new_val;
 
     if (!unit)
         return;
 
     new_val = gpiod_get_value_cansleep(unit->gpio.gpio_privacy);
 
     /* GPIO entities are always on the first chain. */
     chain = list_first_entry(&dev->chains, struct uvc_video_chain, list);
     uvc_ctrl_status_event(chain, unit->controls, &new_val);
 }
 
 static int uvc_gpio_get_cur(struct uvc_device *dev, struct uvc_entity *entity,
                 u8 cs, void *data, u16 size)
 {
     if (cs != UVC_CT_PRIVACY_CONTROL || size < 1)
         return -EINVAL;
 
     *(u8 *)data = gpiod_get_value_cansleep(entity->gpio.gpio_privacy);
 
     return 0;
 }
 
 static int uvc_gpio_get_info(struct uvc_device *dev, struct uvc_entity *entity,
                  u8 cs, u8 *caps)
 {
     if (cs != UVC_CT_PRIVACY_CONTROL)
         return -EINVAL;
 
     *caps = UVC_CONTROL_CAP_GET | UVC_CONTROL_CAP_AUTOUPDATE;
     return 0;
 }
 
 static irqreturn_t uvc_gpio_irq(int irq, void *data)
 {
     struct uvc_device *dev = data;
 
     uvc_gpio_event(dev);
     return IRQ_HANDLED;
 }
 
 static int uvc_gpio_parse(struct uvc_device *dev)
 {
     struct uvc_entity *unit;
     struct gpio_desc *gpio_privacy;
     int irq;
 
     gpio_privacy = devm_gpiod_get_optional(&dev->udev->dev, "privacy",
                            GPIOD_IN);
     if (IS_ERR_OR_NULL(gpio_privacy))
         return PTR_ERR_OR_ZERO(gpio_privacy);
 
     unit = uvc_alloc_entity(UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1);
     if (!unit)
         return -ENOMEM;
 
     irq = gpiod_to_irq(gpio_privacy);
     if (irq < 0) {
         if (irq != EPROBE_DEFER)
             dev_err(&dev->udev->dev,
                 "No IRQ for privacy GPIO (%d)\n", irq);
         return irq;
     }
 
     unit->gpio.gpio_privacy = gpio_privacy;
     unit->gpio.irq = irq;
     unit->gpio.bControlSize = 1;
     unit->gpio.bmControls = (u8 *)unit + sizeof(*unit);
     unit->gpio.bmControls[0] = 1;
     unit->get_cur = uvc_gpio_get_cur;
     unit->get_info = uvc_gpio_get_info;
     strscpy(unit->name, "GPIO", sizeof(unit->name));
 
     list_add_tail(&unit->list, &dev->entities);
 
     dev->gpio_unit = unit;
 
     return 0;
 }
 
 static int uvc_gpio_init_irq(struct uvc_device *dev)
 {
     struct uvc_entity *unit = dev->gpio_unit;
 
     if (!unit || unit->gpio.irq < 0)
         return 0;
 
     return devm_request_threaded_irq(&dev->udev->dev, unit->gpio.irq, NULL,
                      uvc_gpio_irq,
                      IRQF_ONESHOT | IRQF_TRIGGER_FALLING |
                      IRQF_TRIGGER_RISING,
                      "uvc_privacy_gpio", dev);
 }
 
 /* ------------------------------------------------------------------------
  * UVC device scan
  */
 
 /*
  * Scan the UVC descriptors to locate a chain starting at an Output Terminal
  * and containing the following units:
  *
  * - one or more Output Terminals (USB Streaming or Display)
  * - zero or one Processing Unit
  * - zero, one or more single-input Selector Units
  * - zero or one multiple-input Selector Units, provided all inputs are
  *   connected to input terminals
  * - zero, one or mode single-input Extension Units
  * - one or more Input Terminals (Camera, External or USB Streaming)
  *
  * The terminal and units must match on of the following structures:
  *
  * ITT_*(0) -> +---------+    +---------+    +---------+ -> TT_STREAMING(0)
  * ...         | SU{0,1} | -> | PU{0,1} | -> | XU{0,n} |    ...
  * ITT_*(n) -> +---------+    +---------+    +---------+ -> TT_STREAMING(n)
  *
  *                 +---------+    +---------+ -> OTT_*(0)
  * TT_STREAMING -> | PU{0,1} | -> | XU{0,n} |    ...
  *                 +---------+    +---------+ -> OTT_*(n)
  *
  * The Processing Unit and Extension Units can be in any order. Additional
  * Extension Units connected to the main chain as single-unit branches are
  * also supported. Single-input Selector Units are ignored.
  */
 static int uvc_scan_chain_entity(struct uvc_video_chain *chain,
     struct uvc_entity *entity)
 {
     switch (UVC_ENTITY_TYPE(entity)) {
     case UVC_VC_EXTENSION_UNIT:
         uvc_dbg_cont(PROBE, " <- XU %d", entity->id);
 
         if (entity->bNrInPins != 1) {
             uvc_dbg(chain->dev, DESCR,
                 "Extension unit %d has more than 1 input pin\n",
                 entity->id);
             return -1;
         }
 
         break;
 
     case UVC_VC_PROCESSING_UNIT:
         uvc_dbg_cont(PROBE, " <- PU %d", entity->id);
 
         if (chain->processing != NULL) {
             uvc_dbg(chain->dev, DESCR,
                 "Found multiple Processing Units in chain\n");
             return -1;
         }
 
         chain->processing = entity;
         break;
 
     case UVC_VC_SELECTOR_UNIT:
         uvc_dbg_cont(PROBE, " <- SU %d", entity->id);
 
         /* Single-input selector units are ignored. */
         if (entity->bNrInPins == 1)
             break;
 
         if (chain->selector != NULL) {
             uvc_dbg(chain->dev, DESCR,
                 "Found multiple Selector Units in chain\n");
             return -1;
         }
 
         chain->selector = entity;
         break;
 
     case UVC_ITT_VENDOR_SPECIFIC:
     case UVC_ITT_CAMERA:
     case UVC_ITT_MEDIA_TRANSPORT_INPUT:
         uvc_dbg_cont(PROBE, " <- IT %d\n", entity->id);
 
         break;
 
     case UVC_OTT_VENDOR_SPECIFIC:
     case UVC_OTT_DISPLAY:
     case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
         uvc_dbg_cont(PROBE, " OT %d", entity->id);
 
         break;
 
     case UVC_TT_STREAMING:
         if (UVC_ENTITY_IS_ITERM(entity))
             uvc_dbg_cont(PROBE, " <- IT %d\n", entity->id);
         else
             uvc_dbg_cont(PROBE, " OT %d", entity->id);
 
         break;
 
     default:
         uvc_dbg(chain->dev, DESCR,
             "Unsupported entity type 0x%04x found in chain\n",
             UVC_ENTITY_TYPE(entity));
         return -1;
     }
 
     list_add_tail(&entity->chain, &chain->entities);
     return 0;
 }
 
 static int uvc_scan_chain_forward(struct uvc_video_chain *chain,
     struct uvc_entity *entity, struct uvc_entity *prev)
 {
     struct uvc_entity *forward;
     int found;
 
     /* Forward scan */
     forward = NULL;
     found = 0;
 
     while (1) {
         forward = uvc_entity_by_reference(chain->dev, entity->id,
             forward);
         if (forward == NULL)
             break;
         if (forward == prev)
             continue;
         if (forward->chain.next || forward->chain.prev) {
             uvc_dbg(chain->dev, DESCR,
                 "Found reference to entity %d already in chain\n",
                 forward->id);
             return -EINVAL;
         }
 
         switch (UVC_ENTITY_TYPE(forward)) {
         case UVC_VC_EXTENSION_UNIT:
             if (forward->bNrInPins != 1) {
                 uvc_dbg(chain->dev, DESCR,
                     "Extension unit %d has more than 1 input pin\n",
                     forward->id);
                 return -EINVAL;
             }
 
             /*
              * Some devices reference an output terminal as the
              * source of extension units. This is incorrect, as
              * output terminals only have an input pin, and thus
              * can't be connected to any entity in the forward
              * direction. The resulting topology would cause issues
              * when registering the media controller graph. To
              * avoid this problem, connect the extension unit to
              * the source of the output terminal instead.
              */
             if (UVC_ENTITY_IS_OTERM(entity)) {
                 struct uvc_entity *source;
 
                 source = uvc_entity_by_id(chain->dev,
                               entity->baSourceID[0]);
                 if (!source) {
                     uvc_dbg(chain->dev, DESCR,
                         "Can't connect extension unit %u in chain\n",
                         forward->id);
                     break;
                 }
 
                 forward->baSourceID[0] = source->id;
             }
 
             list_add_tail(&forward->chain, &chain->entities);
             if (!found)
                 uvc_dbg_cont(PROBE, " (->");
 
             uvc_dbg_cont(PROBE, " XU %d", forward->id);
             found = 1;
             break;
 
         case UVC_OTT_VENDOR_SPECIFIC:
         case UVC_OTT_DISPLAY:
         case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
         case UVC_TT_STREAMING:
             if (UVC_ENTITY_IS_ITERM(forward)) {
                 uvc_dbg(chain->dev, DESCR,
                     "Unsupported input terminal %u\n",
                     forward->id);
                 return -EINVAL;
             }
 
             if (UVC_ENTITY_IS_OTERM(entity)) {
                 uvc_dbg(chain->dev, DESCR,
                     "Unsupported connection between output terminals %u and %u\n",
                     entity->id, forward->id);
                 break;
             }
 
             list_add_tail(&forward->chain, &chain->entities);
             if (!found)
                 uvc_dbg_cont(PROBE, " (->");
 
             uvc_dbg_cont(PROBE, " OT %d", forward->id);
             found = 1;
             break;
         }
     }
     if (found)
         uvc_dbg_cont(PROBE, ")");
 
     return 0;
 }
 
 static int uvc_scan_chain_backward(struct uvc_video_chain *chain,
     struct uvc_entity **_entity)
 {
     struct uvc_entity *entity = *_entity;
     struct uvc_entity *term;
     int id = -EINVAL, i;
 
     switch (UVC_ENTITY_TYPE(entity)) {
     case UVC_VC_EXTENSION_UNIT:
     case UVC_VC_PROCESSING_UNIT:
         id = entity->baSourceID[0];
         break;
 
     case UVC_VC_SELECTOR_UNIT:
         /* Single-input selector units are ignored. */
         if (entity->bNrInPins == 1) {
             id = entity->baSourceID[0];
             break;
         }
 
         uvc_dbg_cont(PROBE, " <- IT");
 
         chain->selector = entity;
         for (i = 0; i < entity->bNrInPins; ++i) {
             id = entity->baSourceID[i];
             term = uvc_entity_by_id(chain->dev, id);
             if (term == NULL || !UVC_ENTITY_IS_ITERM(term)) {
                 uvc_dbg(chain->dev, DESCR,
                     "Selector unit %d input %d isn't connected to an input terminal\n",
                     entity->id, i);
                 return -1;
             }
 
             if (term->chain.next || term->chain.prev) {
                 uvc_dbg(chain->dev, DESCR,
                     "Found reference to entity %d already in chain\n",
                     term->id);
                 return -EINVAL;
             }
 
             uvc_dbg_cont(PROBE, " %d", term->id);
 
             list_add_tail(&term->chain, &chain->entities);
             uvc_scan_chain_forward(chain, term, entity);
         }
 
         uvc_dbg_cont(PROBE, "\n");
 
         id = 0;
         break;
 
     case UVC_ITT_VENDOR_SPECIFIC:
     case UVC_ITT_CAMERA:
     case UVC_ITT_MEDIA_TRANSPORT_INPUT:
     case UVC_OTT_VENDOR_SPECIFIC:
     case UVC_OTT_DISPLAY:
     case UVC_OTT_MEDIA_TRANSPORT_OUTPUT:
     case UVC_TT_STREAMING:
         id = UVC_ENTITY_IS_OTERM(entity) ? entity->baSourceID[0] : 0;
         break;
     }
 
     if (id <= 0) {
         *_entity = NULL;
         return id;
     }
 
     entity = uvc_entity_by_id(chain->dev, id);
     if (entity == NULL) {
         uvc_dbg(chain->dev, DESCR,
             "Found reference to unknown entity %d\n", id);
         return -EINVAL;
     }
 
     *_entity = entity;
     return 0;
 }
 
 static int uvc_scan_chain(struct uvc_video_chain *chain,
               struct uvc_entity *term)
 {
     struct uvc_entity *entity, *prev;
 
     uvc_dbg(chain->dev, PROBE, "Scanning UVC chain:");
 
     entity = term;
     prev = NULL;
 
     while (entity != NULL) {
         /* Entity must not be part of an existing chain */
         if (entity->chain.next || entity->chain.prev) {
             uvc_dbg(chain->dev, DESCR,
                 "Found reference to entity %d already in chain\n",
                 entity->id);
             return -EINVAL;
         }
 
         /* Process entity */
         if (uvc_scan_chain_entity(chain, entity) < 0)
             return -EINVAL;
 
         /* Forward scan */
         if (uvc_scan_chain_forward(chain, entity, prev) < 0)
             return -EINVAL;
 
         /* Backward scan */
         prev = entity;
         if (uvc_scan_chain_backward(chain, &entity) < 0)
             return -EINVAL;
     }
 
     return 0;
 }
 
 static unsigned int uvc_print_terms(struct list_head *terms, u16 dir,
         char *buffer)
 {
     struct uvc_entity *term;
     unsigned int nterms = 0;
     char *p = buffer;
 
     list_for_each_entry(term, terms, chain) {
         if (!UVC_ENTITY_IS_TERM(term) ||
             UVC_TERM_DIRECTION(term) != dir)
             continue;
 
         if (nterms)
             p += sprintf(p, ",");
         if (++nterms >= 4) {
             p += sprintf(p, "...");
             break;
         }
         p += sprintf(p, "%u", term->id);
     }
 
     return p - buffer;
 }
 
 static const char *uvc_print_chain(struct uvc_video_chain *chain)
 {
     static char buffer[43];
     char *p = buffer;
 
     p += uvc_print_terms(&chain->entities, UVC_TERM_INPUT, p);
     p += sprintf(p, " -> ");
     uvc_print_terms(&chain->entities, UVC_TERM_OUTPUT, p);
 
     return buffer;
 }
 
 static struct uvc_video_chain *uvc_alloc_chain(struct uvc_device *dev)
 {
     struct uvc_video_chain *chain;
 
     chain = kzalloc(sizeof(*chain), GFP_KERNEL);
     if (chain == NULL)
         return NULL;
 
     INIT_LIST_HEAD(&chain->entities);
     mutex_init(&chain->ctrl_mutex);
     chain->dev = dev;
     v4l2_prio_init(&chain->prio);
 
     return chain;
 }
 
 /*
  * Fallback heuristic for devices that don't connect units and terminals in a
  * valid chain.
  *
  * Some devices have invalid baSourceID references, causing uvc_scan_chain()
  * to fail, but if we just take the entities we can find and put them together
  * in the most sensible chain we can think of, turns out they do work anyway.
  * Note: This heuristic assumes there is a single chain.
  *
  * At the time of writing, devices known to have such a broken chain are
  *  - Acer Integrated Camera (5986:055a)
  *  - Realtek rtl157a7 (0bda:57a7)
  */
 static int uvc_scan_fallback(struct uvc_device *dev)
 {
     struct uvc_video_chain *chain;
     struct uvc_entity *iterm = NULL;
     struct uvc_entity *oterm = NULL;
     struct uvc_entity *entity;
     struct uvc_entity *prev;
 
     /*
      * Start by locating the input and output terminals. We only support
      * devices with exactly one of each for now.
      */
     list_for_each_entry(entity, &dev->entities, list) {
         if (UVC_ENTITY_IS_ITERM(entity)) {
             if (iterm)
                 return -EINVAL;
             iterm = entity;
         }
 
         if (UVC_ENTITY_IS_OTERM(entity)) {
             if (oterm)
                 return -EINVAL;
             oterm = entity;
         }
     }
 
     if (iterm == NULL || oterm == NULL)
         return -EINVAL;
 
     /* Allocate the chain and fill it. */
     chain = uvc_alloc_chain(dev);
     if (chain == NULL)
         return -ENOMEM;
 
     if (uvc_scan_chain_entity(chain, oterm) < 0)
         goto error;
 
     prev = oterm;
 
     /*
      * Add all Processing and Extension Units with two pads. The order
      * doesn't matter much, use reverse list traversal to connect units in
      * UVC descriptor order as we build the chain from output to input. This
      * leads to units appearing in the order meant by the manufacturer for
      * the cameras known to require this heuristic.
      */
     list_for_each_entry_reverse(entity, &dev->entities, list) {
         if (entity->type != UVC_VC_PROCESSING_UNIT &&
             entity->type != UVC_VC_EXTENSION_UNIT)
             continue;
 
         if (entity->num_pads != 2)
             continue;
 
         if (uvc_scan_chain_entity(chain, entity) < 0)
             goto error;
 
         prev->baSourceID[0] = entity->id;
         prev = entity;
     }
 
     if (uvc_scan_chain_entity(chain, iterm) < 0)
         goto error;
 
     prev->baSourceID[0] = iterm->id;
 
     list_add_tail(&chain->list, &dev->chains);
 
     uvc_dbg(dev, PROBE, "Found a video chain by fallback heuristic (%s)\n",
         uvc_print_chain(chain));
 
     return 0;
 
 error:
     kfree(chain);
     return -EINVAL;
 }
 
 /*
  * Scan the device for video chains and register video devices.
  *
  * Chains are scanned starting at their output terminals and walked backwards.
  */
 static int uvc_scan_device(struct uvc_device *dev)
 {
     struct uvc_video_chain *chain;
     struct uvc_entity *term;
 
     list_for_each_entry(term, &dev->entities, list) {
         if (!UVC_ENTITY_IS_OTERM(term))
             continue;
 
         /*
          * If the terminal is already included in a chain, skip it.
          * This can happen for chains that have multiple output
          * terminals, where all output terminals beside the first one
          * will be inserted in the chain in forward scans.
          */
         if (term->chain.next || term->chain.prev)
             continue;
 
         chain = uvc_alloc_chain(dev);
         if (chain == NULL)
             return -ENOMEM;
 
         term->flags |= UVC_ENTITY_FLAG_DEFAULT;
 
         if (uvc_scan_chain(chain, term) < 0) {
             kfree(chain);
             continue;
         }
 
         uvc_dbg(dev, PROBE, "Found a valid video chain (%s)\n",
             uvc_print_chain(chain));
 
         list_add_tail(&chain->list, &dev->chains);
     }
 
     if (list_empty(&dev->chains))
         uvc_scan_fallback(dev);
 
     if (list_empty(&dev->chains)) {
         dev_info(&dev->udev->dev, "No valid video chain found.\n");
         return -1;
     }
 
     /* Add GPIO entity to the first chain. */
     if (dev->gpio_unit) {
         chain = list_first_entry(&dev->chains,
                      struct uvc_video_chain, list);
         list_add_tail(&dev->gpio_unit->chain, &chain->entities);
     }
 
     return 0;
 }
 
 /* ------------------------------------------------------------------------
  * Video device registration and unregistration
  */
 
 /*
  * Delete the UVC device.
  *
  * Called by the kernel when the last reference to the uvc_device structure
  * is released.
  *
  * As this function is called after or during disconnect(), all URBs have
  * already been cancelled by the USB core. There is no need to kill the
  * interrupt URB manually.
  */
 static void uvc_delete(struct kref *kref)
 {
     struct uvc_device *dev = container_of(kref, struct uvc_device, ref);
     struct list_head *p, *n;
 
     uvc_status_cleanup(dev);
     uvc_ctrl_cleanup_device(dev);
 
     usb_put_intf(dev->intf);
     usb_put_dev(dev->udev);
 
 #ifdef CONFIG_MEDIA_CONTROLLER
     media_device_cleanup(&dev->mdev);
 #endif
 
     list_for_each_safe(p, n, &dev->chains) {
         struct uvc_video_chain *chain;
         chain = list_entry(p, struct uvc_video_chain, list);
         kfree(chain);
     }
 
     list_for_each_safe(p, n, &dev->entities) {
         struct uvc_entity *entity;
         entity = list_entry(p, struct uvc_entity, list);
 #ifdef CONFIG_MEDIA_CONTROLLER
         uvc_mc_cleanup_entity(entity);
 #endif
         kfree(entity);
     }
 
     list_for_each_safe(p, n, &dev->streams) {
         struct uvc_streaming *streaming;
         streaming = list_entry(p, struct uvc_streaming, list);
         usb_driver_release_interface(&uvc_driver.driver,
             streaming->intf);
         uvc_stream_delete(streaming);
     }
 
     kfree(dev);
 }
 
 static void uvc_release(struct video_device *vdev)
 {
     struct uvc_streaming *stream = video_get_drvdata(vdev);
     struct uvc_device *dev = stream->dev;
 
     kref_put(&dev->ref, uvc_delete);
 }
 
 /*
  * Unregister the video devices.
  */
 static void uvc_unregister_video(struct uvc_device *dev)
 {
     struct uvc_streaming *stream;
 
     list_for_each_entry(stream, &dev->streams, list) {
         if (!video_is_registered(&stream->vdev))
             continue;
 
         video_unregister_device(&stream->vdev);
         video_unregister_device(&stream->meta.vdev);
 
         uvc_debugfs_cleanup_stream(stream);
     }
 
     uvc_status_unregister(dev);
 
     if (dev->vdev.dev)
         v4l2_device_unregister(&dev->vdev);
 #ifdef CONFIG_MEDIA_CONTROLLER
     if (media_devnode_is_registered(dev->mdev.devnode))
         media_device_unregister(&dev->mdev);
 #endif
 }
 
 int uvc_register_video_device(struct uvc_device *dev,
                   struct uvc_streaming *stream,
                   struct video_device *vdev,
                   struct uvc_video_queue *queue,
                   enum v4l2_buf_type type,
                   const struct v4l2_file_operations *fops,
                   const struct v4l2_ioctl_ops *ioctl_ops)
 {
     int ret;
 
     /* Initialize the video buffers queue. */
     ret = uvc_queue_init(queue, type, !uvc_no_drop_param);
     if (ret)
         return ret;
 
     /* Register the device with V4L. */
 
     /*
      * We already hold a reference to dev->udev. The video device will be
      * unregistered before the reference is released, so we don't need to
      * get another one.
      */
     vdev->v4l2_dev = &dev->vdev;
     vdev->fops = fops;
     vdev->ioctl_ops = ioctl_ops;
     vdev->release = uvc_release;
     vdev->prio = &stream->chain->prio;
     if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
         vdev->vfl_dir = VFL_DIR_TX;
     else
         vdev->vfl_dir = VFL_DIR_RX;
 
     switch (type) {
     case V4L2_BUF_TYPE_VIDEO_CAPTURE:
     default:
         vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
         break;
     case V4L2_BUF_TYPE_VIDEO_OUTPUT:
         vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
         break;
     case V4L2_BUF_TYPE_META_CAPTURE:
         vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
         break;
     }
 
     strscpy(vdev->name, dev->name, sizeof(vdev->name));
 
     /*
      * Set the driver data before calling video_register_device, otherwise
      * the file open() handler might race us.
      */
     video_set_drvdata(vdev, stream);
 
     ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
     if (ret < 0) {
         dev_err(&stream->intf->dev,
             "Failed to register %s device (%d).\n",
             v4l2_type_names[type], ret);
         return ret;
     }
 
     kref_get(&dev->ref);
     return 0;
 }
 
 static int uvc_register_video(struct uvc_device *dev,
         struct uvc_streaming *stream)
 {
     int ret;
 
     /* Initialize the streaming interface with default parameters. */
     ret = uvc_video_init(stream);
     if (ret < 0) {
         dev_err(&stream->intf->dev,
             "Failed to initialize the device (%d).\n", ret);
         return ret;
     }
 
     if (stream->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
         stream->chain->caps |= V4L2_CAP_VIDEO_CAPTURE
             | V4L2_CAP_META_CAPTURE;
     else
         stream->chain->caps |= V4L2_CAP_VIDEO_OUTPUT;
 
     uvc_debugfs_init_stream(stream);
 
     /* Register the device with V4L. */
     return uvc_register_video_device(dev, stream, &stream->vdev,
                      &stream->queue, stream->type,
                      &uvc_fops, &uvc_ioctl_ops);
 }
 
 /*
  * Register all video devices in all chains.
  */
 static int uvc_register_terms(struct uvc_device *dev,
     struct uvc_video_chain *chain)
 {
     struct uvc_streaming *stream;
     struct uvc_entity *term;
     int ret;
 
     list_for_each_entry(term, &chain->entities, chain) {
         if (UVC_ENTITY_TYPE(term) != UVC_TT_STREAMING)
             continue;
 
         stream = uvc_stream_by_id(dev, term->id);
         if (stream == NULL) {
             dev_info(&dev->udev->dev,
                  "No streaming interface found for terminal %u.",
                  term->id);
             continue;
         }
 
         stream->chain = chain;
         ret = uvc_register_video(dev, stream);
         if (ret < 0)
             return ret;
 
         /*
          * Register a metadata node, but ignore a possible failure,
          * complete registration of video nodes anyway.
          */
         uvc_meta_register(stream);
 
         term->vdev = &stream->vdev;
     }
 
     return 0;
 }
 
 static int uvc_register_chains(struct uvc_device *dev)
 {
     struct uvc_video_chain *chain;
     int ret;
 
     list_for_each_entry(chain, &dev->chains, list) {
         ret = uvc_register_terms(dev, chain);
         if (ret < 0)
             return ret;
 
 #ifdef CONFIG_MEDIA_CONTROLLER
         ret = uvc_mc_register_entities(chain);
         if (ret < 0)
             dev_info(&dev->udev->dev,
                  "Failed to register entities (%d).\n", ret);
 #endif
     }
 
     return 0;
 }
 
 /* ------------------------------------------------------------------------
  * USB probe, disconnect, suspend and resume
  */
 
 static const struct uvc_device_info uvc_quirk_none = { 0 };
 
 static int uvc_probe(struct usb_interface *intf,
              const struct usb_device_id *id)
 {
     struct usb_device *udev = interface_to_usbdev(intf);
     struct uvc_device *dev;
     const struct uvc_device_info *info =
         (const struct uvc_device_info *)id->driver_info;
     int function;
     int ret;
 
     /* Allocate memory for the device and initialize it. */
     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
     if (dev == NULL)
         return -ENOMEM;
 
     INIT_LIST_HEAD(&dev->entities);
     INIT_LIST_HEAD(&dev->chains);
     INIT_LIST_HEAD(&dev->streams);
     kref_init(&dev->ref);
     atomic_set(&dev->nmappings, 0);
     mutex_init(&dev->lock);
 
     dev->udev = usb_get_dev(udev);
     dev->intf = usb_get_intf(intf);
     dev->intfnum = intf->cur_altsetting->desc.bInterfaceNumber;
     dev->info = info ? info : &uvc_quirk_none;
     dev->quirks = uvc_quirks_param == -1
             ? dev->info->quirks : uvc_quirks_param;
 
     if (id->idVendor && id->idProduct)
         uvc_dbg(dev, PROBE, "Probing known UVC device %s (%04x:%04x)\n",
             udev->devpath, id->idVendor, id->idProduct);
     else
         uvc_dbg(dev, PROBE, "Probing generic UVC device %s\n",
             udev->devpath);
 
     if (udev->product != NULL)
         strscpy(dev->name, udev->product, sizeof(dev->name));
     else
         snprintf(dev->name, sizeof(dev->name),
              "UVC Camera (%04x:%04x)",
              le16_to_cpu(udev->descriptor.idVendor),
              le16_to_cpu(udev->descriptor.idProduct));
 
     /*
      * Add iFunction or iInterface to names when available as additional
      * distinguishers between interfaces. iFunction is prioritized over
      * iInterface which matches Windows behavior at the point of writing.
      */
     if (intf->intf_assoc && intf->intf_assoc->iFunction != 0)
         function = intf->intf_assoc->iFunction;
     else
         function = intf->cur_altsetting->desc.iInterface;
     if (function != 0) {
         size_t len;
 
         strlcat(dev->name, ": ", sizeof(dev->name));
         len = strlen(dev->name);
         usb_string(udev, function, dev->name + len,
                sizeof(dev->name) - len);
     }
 
     /* Initialize the media device. */
 #ifdef CONFIG_MEDIA_CONTROLLER
     dev->mdev.dev = &intf->dev;
     strscpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
     if (udev->serial)
         strscpy(dev->mdev.serial, udev->serial,
             sizeof(dev->mdev.serial));
     usb_make_path(udev, dev->mdev.bus_info, sizeof(dev->mdev.bus_info));
     dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
     media_device_init(&dev->mdev);
 
     dev->vdev.mdev = &dev->mdev;
 #endif
 
     /* Parse the Video Class control descriptor. */
     if (uvc_parse_control(dev) < 0) {
         uvc_dbg(dev, PROBE, "Unable to parse UVC descriptors\n");
         goto error;
     }
 
     /* Parse the associated GPIOs. */
     if (uvc_gpio_parse(dev) < 0) {
         uvc_dbg(dev, PROBE, "Unable to parse UVC GPIOs\n");
         goto error;
     }
 
     dev_info(&dev->udev->dev, "Found UVC %u.%02x device %s (%04x:%04x)\n",
          dev->uvc_version >> 8, dev->uvc_version & 0xff,
          udev->product ? udev->product : "<unnamed>",
          le16_to_cpu(udev->descriptor.idVendor),
          le16_to_cpu(udev->descriptor.idProduct));
 
     if (dev->quirks != dev->info->quirks) {
         dev_info(&dev->udev->dev,
              "Forcing device quirks to 0x%x by module parameter for testing purpose.\n",
              dev->quirks);
         dev_info(&dev->udev->dev,
              "Please report required quirks to the linux-media mailing list.\n");
     }
 
     if (dev->info->uvc_version) {
         dev->uvc_version = dev->info->uvc_version;
         dev_info(&dev->udev->dev, "Forcing UVC version to %u.%02x\n",
              dev->uvc_version >> 8, dev->uvc_version & 0xff);
     }
 
     /* Register the V4L2 device. */
     if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
         goto error;
 
     /* Scan the device for video chains. */
     if (uvc_scan_device(dev) < 0)
         goto error;
 
     /* Initialize controls. */
     if (uvc_ctrl_init_device(dev) < 0)
         goto error;
 
     /* Register video device nodes. */
     if (uvc_register_chains(dev) < 0)
         goto error;
 
 #ifdef CONFIG_MEDIA_CONTROLLER
     /* Register the media device node */
     if (media_device_register(&dev->mdev) < 0)
         goto error;
 #endif
     /* Save our data pointer in the interface data. */
     usb_set_intfdata(intf, dev);
 
     /* Initialize the interrupt URB. */
     if ((ret = uvc_status_init(dev)) < 0) {
         dev_info(&dev->udev->dev,
              "Unable to initialize the status endpoint (%d), status interrupt will not be supported.\n",
              ret);
     }
 
     ret = uvc_gpio_init_irq(dev);
     if (ret < 0) {
         dev_err(&dev->udev->dev,
             "Unable to request privacy GPIO IRQ (%d)\n", ret);
         goto error;
     }
 
     uvc_dbg(dev, PROBE, "UVC device initialized\n");
     usb_enable_autosuspend(udev);
     return 0;
 
 error:
     uvc_unregister_video(dev);
     kref_put(&dev->ref, uvc_delete);
     return -ENODEV;
 }
 
 static void uvc_disconnect(struct usb_interface *intf)
 {
     struct uvc_device *dev = usb_get_intfdata(intf);
 
     /*
      * Set the USB interface data to NULL. This can be done outside the
      * lock, as there's no other reader.
      */
     usb_set_intfdata(intf, NULL);
 
     if (intf->cur_altsetting->desc.bInterfaceSubClass ==
         UVC_SC_VIDEOSTREAMING)
         return;
 
     uvc_unregister_video(dev);
     kref_put(&dev->ref, uvc_delete);
 }
 
 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
 {
     struct uvc_device *dev = usb_get_intfdata(intf);
     struct uvc_streaming *stream;
 
     uvc_dbg(dev, SUSPEND, "Suspending interface %u\n",
         intf->cur_altsetting->desc.bInterfaceNumber);
 
     /* Controls are cached on the fly so they don't need to be saved. */
     if (intf->cur_altsetting->desc.bInterfaceSubClass ==
         UVC_SC_VIDEOCONTROL) {
         mutex_lock(&dev->lock);
         if (dev->users)
             uvc_status_stop(dev);
         mutex_unlock(&dev->lock);
         return 0;
     }
 
     list_for_each_entry(stream, &dev->streams, list) {
         if (stream->intf == intf)
             return uvc_video_suspend(stream);
     }
 
     uvc_dbg(dev, SUSPEND,
         "Suspend: video streaming USB interface mismatch\n");
     return -EINVAL;
 }
 
 static int __uvc_resume(struct usb_interface *intf, int reset)
 {
     struct uvc_device *dev = usb_get_intfdata(intf);
     struct uvc_streaming *stream;
     int ret = 0;
 
     uvc_dbg(dev, SUSPEND, "Resuming interface %u\n",
         intf->cur_altsetting->desc.bInterfaceNumber);
 
     if (intf->cur_altsetting->desc.bInterfaceSubClass ==
         UVC_SC_VIDEOCONTROL) {
         if (reset) {
             ret = uvc_ctrl_restore_values(dev);
             if (ret < 0)
                 return ret;
         }
 
         mutex_lock(&dev->lock);
         if (dev->users)
             ret = uvc_status_start(dev, GFP_NOIO);
         mutex_unlock(&dev->lock);
 
         return ret;
     }
 
     list_for_each_entry(stream, &dev->streams, list) {
         if (stream->intf == intf) {
             ret = uvc_video_resume(stream, reset);
             if (ret < 0)
                 uvc_queue_streamoff(&stream->queue,
                             stream->queue.queue.type);
             return ret;
         }
     }
 
     uvc_dbg(dev, SUSPEND,
         "Resume: video streaming USB interface mismatch\n");
     return -EINVAL;
 }
 
 static int uvc_resume(struct usb_interface *intf)
 {
     return __uvc_resume(intf, 0);
 }
 
 static int uvc_reset_resume(struct usb_interface *intf)
 {
     return __uvc_resume(intf, 1);
 }
 
 /* ------------------------------------------------------------------------
  * Module parameters
  */
 
 static int uvc_clock_param_get(char *buffer, const struct kernel_param *kp)
 {
     if (uvc_clock_param == CLOCK_MONOTONIC)
         return sprintf(buffer, "CLOCK_MONOTONIC");
     else
         return sprintf(buffer, "CLOCK_REALTIME");
 }
 
 static int uvc_clock_param_set(const char *val, const struct kernel_param *kp)
 {
     if (strncasecmp(val, "clock_", strlen("clock_")) == 0)
         val += strlen("clock_");
 
     if (strcasecmp(val, "monotonic") == 0)
         uvc_clock_param = CLOCK_MONOTONIC;
     else if (strcasecmp(val, "realtime") == 0)
         uvc_clock_param = CLOCK_REALTIME;
     else
         return -EINVAL;
 
     return 0;
 }
 
 module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
           &uvc_clock_param, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
 module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
 module_param_named(nodrop, uvc_no_drop_param, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
 module_param_named(quirks, uvc_quirks_param, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(quirks, "Forced device quirks");
 module_param_named(trace, uvc_dbg_param, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(trace, "Trace level bitmask");
 module_param_named(timeout, uvc_timeout_param, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(timeout, "Streaming control requests timeout");
 
 /* ------------------------------------------------------------------------
  * Driver initialization and cleanup
  */
 
 static const struct uvc_menu_info power_line_frequency_controls_limited[] = {
     { 1, "50 Hz" },
     { 2, "60 Hz" },
 };
 
 static const struct uvc_control_mapping uvc_ctrl_power_line_mapping_limited = {
     .id     = V4L2_CID_POWER_LINE_FREQUENCY,
     .entity     = UVC_GUID_UVC_PROCESSING,
     .selector   = UVC_PU_POWER_LINE_FREQUENCY_CONTROL,
     .size       = 2,
     .offset     = 0,
     .v4l2_type  = V4L2_CTRL_TYPE_MENU,
     .data_type  = UVC_CTRL_DATA_TYPE_ENUM,
     .menu_info  = power_line_frequency_controls_limited,
     .menu_count = ARRAY_SIZE(power_line_frequency_controls_limited),
 };
 
 static const struct uvc_device_info uvc_ctrl_power_line_limited = {
     .mappings = (const struct uvc_control_mapping *[]) {
         &uvc_ctrl_power_line_mapping_limited,
         NULL, /* Sentinel */
     },
 };
 
 static const struct uvc_device_info uvc_quirk_probe_minmax = {
     .quirks = UVC_QUIRK_PROBE_MINMAX,
 };
 
 static const struct uvc_device_info uvc_quirk_fix_bandwidth = {
     .quirks = UVC_QUIRK_FIX_BANDWIDTH,
 };
 
 static const struct uvc_device_info uvc_quirk_probe_def = {
     .quirks = UVC_QUIRK_PROBE_DEF,
 };
 
 static const struct uvc_device_info uvc_quirk_stream_no_fid = {
     .quirks = UVC_QUIRK_STREAM_NO_FID,
 };
 
 static const struct uvc_device_info uvc_quirk_force_y8 = {
     .quirks = UVC_QUIRK_FORCE_Y8,
 };
 
 #define UVC_INFO_QUIRK(q) (kernel_ulong_t)&(struct uvc_device_info){.quirks = q}
 #define UVC_INFO_META(m) (kernel_ulong_t)&(struct uvc_device_info) \
     {.meta_format = m}
 
 /*
  * The Logitech cameras listed below have their interface class set to
  * VENDOR_SPEC because they don't announce themselves as UVC devices, even
  * though they are compliant.
  */
 static const struct usb_device_id uvc_ids[] = {
     /* Quanta USB2.0 HD UVC Webcam */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0408,
       .idProduct        = 0x3090,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* Quanta USB2.0 HD UVC Webcam */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0408,
       .idProduct        = 0x4030,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* Quanta USB2.0 HD UVC Webcam */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0408,
       .idProduct        = 0x4034,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = UVC_PC_PROTOCOL_15,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* LogiLink Wireless Webcam */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0416,
       .idProduct        = 0xa91a,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Genius eFace 2025 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0458,
       .idProduct        = 0x706e,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Microsoft Lifecam NX-6000 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x045e,
       .idProduct        = 0x00f8,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Microsoft Lifecam NX-3000 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x045e,
       .idProduct        = 0x0721,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Microsoft Lifecam VX-7000 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x045e,
       .idProduct        = 0x0723,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Logitech Quickcam Fusion */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x08c1,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Logitech Quickcam Orbit MP */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x08c2,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Logitech Quickcam Pro for Notebook */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x08c3,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Logitech Quickcam Pro 5000 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x08c5,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Logitech Quickcam OEM Dell Notebook */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x08c6,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Logitech Quickcam OEM Cisco VT Camera II */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x08c7,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Logitech HD Pro Webcam C920 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x046d,
       .idProduct        = 0x082d,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT) },
     /* Chicony CNF7129 (Asus EEE 100HE) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x04f2,
       .idProduct        = 0xb071,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_RESTRICT_FRAME_RATE) },
     /* Chicony EasyCamera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x04f2,
       .idProduct        = 0xb5eb,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* Chicony EasyCamera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x04f2,
       .idProduct        = 0xb6ba,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* Chicony EasyCamera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x04f2,
       .idProduct        = 0xb746,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x058f,
       .idProduct        = 0x3820,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Dell XPS m1530 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05a9,
       .idProduct        = 0x2640,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Dell SP2008WFP Monitor */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05a9,
       .idProduct        = 0x2641,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Dell Alienware X51 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05a9,
       .idProduct        = 0x2643,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Dell Studio Hybrid 140g (OmniVision webcam) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05a9,
       .idProduct        = 0x264a,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Dell XPS M1330 (OmniVision OV7670 webcam) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05a9,
       .idProduct        = 0x7670,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Apple Built-In iSight */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05ac,
       .idProduct        = 0x8501,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
                     | UVC_QUIRK_BUILTIN_ISIGHT) },
     /* Apple FaceTime HD Camera (Built-In) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05ac,
       .idProduct        = 0x8514,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Apple Built-In iSight via iBridge */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05ac,
       .idProduct        = 0x8600,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* Foxlink ("HP Webcam" on HP Mini 5103) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05c8,
       .idProduct        = 0x0403,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
     /* Genesys Logic USB 2.0 PC Camera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x05e3,
       .idProduct        = 0x0505,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Hercules Classic Silver */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x06f8,
       .idProduct        = 0x300c,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
     /* ViMicro Vega */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0ac8,
       .idProduct        = 0x332d,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
     /* ViMicro - Minoru3D */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0ac8,
       .idProduct        = 0x3410,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
     /* ViMicro Venus - Minoru3D */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0ac8,
       .idProduct        = 0x3420,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_fix_bandwidth },
     /* Ophir Optronics - SPCAM 620U */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0bd3,
       .idProduct        = 0x0555,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* MT6227 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x0e8d,
       .idProduct        = 0x0004,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
                     | UVC_QUIRK_PROBE_DEF) },
     /* IMC Networks (Medion Akoya) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x13d3,
       .idProduct        = 0x5103,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* JMicron USB2.0 XGA WebCam */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x152d,
       .idProduct        = 0x0310,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Syntek (HP Spartan) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x174f,
       .idProduct        = 0x5212,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Syntek (Samsung Q310) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x174f,
       .idProduct        = 0x5931,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Syntek (Packard Bell EasyNote MX52 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x174f,
       .idProduct        = 0x8a12,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Syntek (Asus F9SG) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x174f,
       .idProduct        = 0x8a31,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Syntek (Asus U3S) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x174f,
       .idProduct        = 0x8a33,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Syntek (JAOtech Smart Terminal) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x174f,
       .idProduct        = 0x8a34,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Miricle 307K */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x17dc,
       .idProduct        = 0x0202,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Lenovo Thinkpad SL400/SL500 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x17ef,
       .idProduct        = 0x480b,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_stream_no_fid },
     /* Aveo Technology USB 2.0 Camera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x1871,
       .idProduct        = 0x0306,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
                     | UVC_QUIRK_PROBE_EXTRAFIELDS) },
     /* Aveo Technology USB 2.0 Camera (Tasco USB Microscope) */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x1871,
       .idProduct        = 0x0516,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Ecamm Pico iMage */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x18cd,
       .idProduct        = 0xcafe,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_EXTRAFIELDS) },
     /* Manta MM-353 Plako */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x18ec,
       .idProduct        = 0x3188,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* FSC WebCam V30S */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x18ec,
       .idProduct        = 0x3288,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Arkmicro unbranded */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x18ec,
       .idProduct        = 0x3290,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_def },
     /* The Imaging Source USB CCD cameras */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x199e,
       .idProduct        = 0x8102,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0 },
     /* Bodelin ProScopeHR */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_DEV_HI
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x19ab,
       .idProduct        = 0x1000,
       .bcdDevice_hi     = 0x0126,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_STATUS_INTERVAL) },
     /* MSI StarCam 370i */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x1b3b,
       .idProduct        = 0x2951,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Generalplus Technology Inc. 808 Camera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x1b3f,
       .idProduct        = 0x2002,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_probe_minmax },
     /* Shenzhen Aoni Electronic Co.,Ltd 2K FHD camera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x1bcf,
       .idProduct        = 0x0b40,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&(const struct uvc_device_info){
         .uvc_version = 0x010a,
       } },
     /* SiGma Micro USB Web Camera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x1c4f,
       .idProduct        = 0x3000,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_PROBE_MINMAX
                     | UVC_QUIRK_IGNORE_SELECTOR_UNIT) },
     /* Oculus VR Positional Tracker DK2 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x2833,
       .idProduct        = 0x0201,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_force_y8 },
     /* Oculus VR Rift Sensor */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x2833,
       .idProduct        = 0x0211,
       .bInterfaceClass  = USB_CLASS_VENDOR_SPEC,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_quirk_force_y8 },
     /* GEO Semiconductor GC6500 */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x29fe,
       .idProduct        = 0x4d53,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_QUIRK(UVC_QUIRK_FORCE_BPP) },
     /* Acer EasyCamera */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x5986,
       .idProduct        = 0x1172,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = (kernel_ulong_t)&uvc_ctrl_power_line_limited },
     /* Intel RealSense D4M */
     { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE
                 | USB_DEVICE_ID_MATCH_INT_INFO,
       .idVendor     = 0x8086,
       .idProduct        = 0x0b03,
       .bInterfaceClass  = USB_CLASS_VIDEO,
       .bInterfaceSubClass   = 1,
       .bInterfaceProtocol   = 0,
       .driver_info      = UVC_INFO_META(V4L2_META_FMT_D4XX) },
     /* Generic USB Video Class */
     { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_UNDEFINED) },
     { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, UVC_PC_PROTOCOL_15) },
     {}
 };
 
 MODULE_DEVICE_TABLE(usb, uvc_ids);
 
 struct uvc_driver uvc_driver = {
     .driver = {
         .name       = "uvcvideo",
         .probe      = uvc_probe,
         .disconnect = uvc_disconnect,
         .suspend    = uvc_suspend,
         .resume     = uvc_resume,
         .reset_resume   = uvc_reset_resume,
         .id_table   = uvc_ids,
         .supports_autosuspend = 1,
     },
 };
 
 static int __init uvc_init(void)
 {
     int ret;
 
     uvc_debugfs_init();
 
     ret = usb_register(&uvc_driver.driver);
     if (ret < 0) {
         uvc_debugfs_cleanup();
         return ret;
     }
 
     return 0;
 }
 
 static void __exit uvc_cleanup(void)
 {
     usb_deregister(&uvc_driver.driver);
     uvc_debugfs_cleanup();
 }
 
 module_init(uvc_init);
 module_exit(uvc_cleanup);
 
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRIVER_VERSION);