usb: Replace USBDEVFS interface with libusb

In order to support selecting board based on serial number the iProduct
field needs to be inspected, with the hand-rolled parsing of the USB
descriptors this becomes cumbersome.

Furthermore the direct use of Linux's USBDEVFS creats an unnecessary
dependency on the host OS being Linux.

It's unclear why libusb wasn't choosen in the first place, perhaps it
relates to the faint memory of 0.1 vs 1.0 packaging issues?

Move to libusb-1.0 in order to resolve these issues, as well as clean up
the code a bit.

Signed-off-by: Bjorn Andersson <[email protected]>

Makefile

@@ -2,7 +2,7 @@ QDL := qdl
 RAMDUMP := qdl-ramdump
 
 CFLAGS := -O2 -Wall -g `pkg-config --cflags libxml-2.0`
-LDFLAGS := `pkg-config --libs libxml-2.0 libudev`
+LDFLAGS := `pkg-config --libs libxml-2.0` -lusb-1.0
 prefix := /usr/local
 
 QDL_SRCS := firehose.c qdl.c sahara.c util.c patch.c program.c ufs.c usb.c

README

@@ -9,8 +9,8 @@ Usage:
 
 Building
 ========
-In order to build the project you need libxml2 and libudev headers
-and libraries, found in e.g. the libxml2-dev and libudev-dev packages
+In order to build the project you need libxml2 and libusb-1.0 headers
+and libraries, found in e.g. the libxml2-dev and libusb-1.0.0-dev packages
 
 With these installed run:
   make

qdl.h

@@ -9,7 +9,10 @@
 
 #define MAPPING_SZ 64
 
+struct libusb_device_handle;
+
 struct qdl_device {
+        struct libusb_device_handle *usb_handle;
         int fd;
 
         int in_ep;