[usb] Expose USB device descriptor and strings via settings

Allow scripts to read basic information from USB device descriptors
via the settings mechanism.  For example:

  echo USB vendor ID: ${usb/${busloc}.8.2}
  echo USB device ID: ${usb/${busloc}.10.2}
  echo USB manufacturer name: ${usb/${busloc}.14.0}

The general syntax is

  usb/<bus:dev>.<offset>.<length>

where bus:dev is the USB bus:device address (as obtained via the
"usbscan" command, or from e.g. ${net0/busloc} for a USB network
device), and <offset> and <length> select the required portion of the
USB device descriptor.

Following the usage of SMBIOS settings tags, a <length> of zero may be
used to indicate that the byte at <offset> contains a USB string
descriptor index, and an <offset> of zero may be used to indicate that
the <length> contains a literal USB string descriptor index.

Since the byte at offset zero can never contain a string index, and a
literal string index can never be zero, the combination of both
<length> and <offset> being zero may be used to indicate that the
entire device descriptor is to be read as a raw hex dump.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/config/config_usb.c

@@ -22,6 +22,7 @@
 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 #include <config/usb.h>
+#include <config/settings.h>
 
 /** @file
  *
@@ -63,3 +64,10 @@ REQUIRE_OBJECT ( usbblk );
 #ifdef USB_EFI
 REQUIRE_OBJECT ( efi_usb );
 #endif
+
+/*
+ * Drag in USB settings mechanism
+ */
+#ifdef USB_SETTINGS
+REQUIRE_OBJECT ( usb_settings );
+#endif

src/config/settings.h

@@ -12,6 +12,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 #include <config/defaults.h>
 
 #define	PCI_SETTINGS	/* PCI device settings */
+#define	USB_SETTINGS	/* USB device settings */
 //#define	CPUID_SETTINGS	/* CPUID settings */
 //#define	MEMMAP_SETTINGS	/* Memory map settings */
 //#define	VMWARE_SETTINGS	/* VMware GuestInfo settings */