On Wed, 1 Sep 2010, Sarah Sharp wrote:
> Add the ability to print the MaxStreams and Mult fields from the
> SuperSpeed Endpoint Companion Descriptors. Only print them for the
> correct endpoint types (MaxStreams is only valid for bulk endpoints, and
> Mult is only valid for isochronous endpoints).
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -29,7 +29,7 @@ lsusb_CPPFLAGS = \
> -DDATADIR=\"$(datadir)\"
>
> lsusb_LDADD = \
> - $(LIBUSB_LIBS)
> + $(LIBUSB_LIBS) -lm
>
> man_MANS = \
> lsusb.8 \
> diff --git a/lsusb.c b/lsusb.c
> index a25ad69..a6c64c5 100644
> --- a/lsusb.c
> +++ b/lsusb.c
> @@ -34,6 +34,7 @@
> #include <stdarg.h>
> #include <byteswap.h>
> #include <usb.h>
> +#include <math.h>
>
> #include "names.h"
> #include "devtree.h"
> @@ -770,6 +771,15 @@ static void dump_endpoint(struct usb_dev_handle *dev, struct usb_interface_descr
> break;
> case USB_DT_SS_ENDPOINT_COMP:
> printf(" bMaxBurst %15u\n", buf[2] + 1);
> + /* Print bulk streams info or isoc "Mult" */
> + if ((endpoint->bmAttributes & 3) == 2 &&
> + (buf[3] & 0x1f))
> + printf(" MaxStreams %14u\n",
> + (unsigned) pow(2, buf[3]));
You've got to be kidding. Use a floating-point exponentiation function
from the math library to compute an integer power of 2?
What's wrong with "1 << buf[3]"?
Alan Stern
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