libusb: improve compatibility

Specifically, add LIBUSB_CLASS_PHYSICAL and the libusb_has_capability API.
Descriptions and functionality for these derived from the
documentation at [0].  The current set of capabilities are all supported by
libusb.

These were detected as missing after updating net/freerdp to 2.1.1, which
attempted to use both.

[0] http://libusb.sourceforge.net/api-1.0/group__libusb__misc.html

Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D25194

lib/libusb/Makefile

@@ -68,6 +68,7 @@ CFLAGS+=	-I ../../sys
 MLINKS += libusb.3 libusb_get_version.3
 MLINKS += libusb.3 libusb_init.3
 MLINKS += libusb.3 libusb_exit.3
+MLINKS += libusb.3 libusb_has_capability.3
 MLINKS += libusb.3 libusb_strerror.3
 MLINKS += libusb.3 libusb_error_name.3
 MLINKS += libusb.3 libusb_set_debug.3

lib/libusb/libusb.3

@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 11, 2018
+.Dd June 9, 2020
 .Dt LIBUSB 3
 .Os
 .Sh NAME
@@ -61,6 +61,33 @@ Deinitialise libusb.
 Must be called at the end of the application.
 Other libusb routines may not be called after this function.
 .Pp
+.Ft int
+.Fn libusb_has_capability "uint32_t capability"
+This function checks the runtime capabilities of
+.Nm .
+This function will return non-zero if the given
+.Fa capability
+is supported, 0 if it is not supported.
+The valid values for
+.Fa capability
+are:
+.Bl -tag -width LIBUSB_CAP -offset indent
+.It Va LIBUSB_CAP_HAS_CAPABILITY
+.Nm
+supports
+.Fn libusb_has_capability .
+.It Va LIBUSB_CAP_HAS_HOTPLUG
+.Nm
+supports hotplug notifications.
+.It Va LIBUSB_CAP_HAS_HID_ACCESS
+.Nm
+can access HID devices without requiring user intervention.
+.It Va LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER
+.Nm
+supports detaching of the default USB driver with
+.Fn libusb_detach_kernel_driver .
+.El
+.Pp
 .Ft const char *
 .Fn libusb_strerror "int code"
 Get the ASCII representation of the error given by the

lib/libusb/libusb.h

@@ -54,6 +54,7 @@ enum libusb_class_code {
 	LIBUSB_CLASS_AUDIO = 1,
 	LIBUSB_CLASS_COMM = 2,
 	LIBUSB_CLASS_HID = 3,
+	LIBUSB_CLASS_PHYSICAL = 5,
 	LIBUSB_CLASS_PTP = 6,
 	LIBUSB_CLASS_IMAGE = 6,
 	LIBUSB_CLASS_PRINTER = 7,
@@ -178,6 +179,21 @@ enum libusb_bos_type {
 	LIBUSB_BT_CONTAINER_ID = 4,
 };
 
+enum libusb_capability {
+	/* libusb supports libusb_has_capability(). */
+	LIBUSB_CAP_HAS_CAPABILITY = 0,
+	/* Hotplug support is available. */
+	LIBUSB_CAP_HAS_HOTPLUG,
+	/* Can access HID devices without requiring user intervention. */
+	LIBUSB_CAP_HAS_HID_ACCESS,
+
+	/*
+	 * Supports detaching of the default USB driver with
+	 * libusb_detach_kernel_driver().
+	 */
+	LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER,
+};
+
 enum libusb_error {
 	LIBUSB_SUCCESS = 0,
 	LIBUSB_ERROR_IO = -1,
@@ -450,6 +466,7 @@ const char *libusb_strerror(int code);
 const char *libusb_error_name(int code);
 int	libusb_init(libusb_context ** context);
 void	libusb_exit(struct libusb_context *ctx);
+int	libusb_has_capability(uint32_t capability);
 
 /* Device handling and enumeration */
 

lib/libusb/libusb10.c

@@ -1716,3 +1716,18 @@ libusb_error_name(int code)
 		return ("LIBUSB_ERROR_UNKNOWN");
 	}
 }
+
+int
+libusb_has_capability(uint32_t capability)
+{
+
+	switch (capability) {
+	case LIBUSB_CAP_HAS_CAPABILITY:
+	case LIBUSB_CAP_HAS_HOTPLUG:
+	case LIBUSB_CAP_HAS_HID_ACCESS:
+	case LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER:
+		return (1);
+	default:
+		return (0);
+	}
+}