add jtag/usb_common.[ch] files

Begins to consolidate code used by several USB JTAG interfaces.
This first patch provides the required build system changes and
a common jtag_usb_open routine, which will replace the guts for
probing the busses and devices for possible VID/PID matches.
The following patches convert each driver to use it.

configure.in

@@ -996,6 +996,7 @@ if test $build_jlink = yes -o $build_vsllink = yes -o $build_usbprog = yes -o \
 then
   AC_CHECK_HEADERS([usb.h],[],
   [AC_MSG_ERROR([usb.h is required to build some OpenOCD driver(s)])])
+  build_usb=yes
 fi
 
 AM_CONDITIONAL(RELEASE, test $build_release = yes)
@@ -1021,6 +1022,7 @@ AM_CONDITIONAL(JLINK, test $build_jlink = yes)
 AM_CONDITIONAL(VSLLINK, test $build_vsllink = yes)
 AM_CONDITIONAL(RLINK, test $build_rlink = yes)
 AM_CONDITIONAL(ARMJTAGEW, test $build_armjtagew = yes)
+AM_CONDITIONAL(USB, test $build_usb = yes)
 AM_CONDITIONAL(IS_CYGWIN, test $is_cygwin = yes)
 AM_CONDITIONAL(IS_MINGW, test $is_mingw = yes)
 AM_CONDITIONAL(IS_WIN32, test $is_win32 = yes)

src/jtag/Makefile.am

@@ -23,6 +23,10 @@ else
 # Standard Driver: common files
 DRIVERFILES += driver.c commands.c
 
+if USB
+DRIVERFILES += usb_common.c
+endif
+
 if BITBANG
 DRIVERFILES += bitbang.c
 endif
@@ -92,7 +96,8 @@ noinst_HEADERS = \
 	rlink/ep1_cmd.h \
 	rlink/rlink.h \
 	rlink/st7.h \
-	minidummy/jtag_minidriver.h
+	minidummy/jtag_minidriver.h \
+	usb_common.h
 
 EXTRA_DIST = startup.tcl
 

src/jtag/usb_common.c

+/***************************************************************************
+ *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "usb_common.h"
+
+
+static bool jtag_usb_match(struct usb_device *dev,
+		const uint16_t vids[], const uint16_t pids[])
+{
+	for (unsigned i = 0; vids[i] && pids[i]; i++)
+	{
+		if (dev->descriptor.idVendor == vids[i] &&
+			dev->descriptor.idProduct == pids[i])
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+int jtag_usb_open(const uint16_t vids[], const uint16_t pids[],
+		struct usb_dev_handle **out)
+{
+	usb_find_busses();
+	usb_find_devices();
+
+	struct usb_bus *busses = usb_get_busses();
+	for (struct usb_bus *bus = busses; bus; bus = bus->next)
+	{
+		for (struct usb_device *dev = bus->devices; dev; dev = dev->next)
+		{
+			if (!jtag_usb_match(dev, vids, pids))
+				continue;
+
+			*out = usb_open(dev);
+			if (NULL == *out)
+				return -errno;
+			return 0;
+		}
+	}
+	return -ENODEV;
+}

src/jtag/usb_common.h

+/***************************************************************************
+ *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+#ifndef JTAG_USB_COMMON_H
+#define JTAG_USB_COMMON_H
+
+#include "types.h"
+
+#include <usb.h>
+
+int jtag_usb_open(const uint16_t vids[], const uint16_t pids[],
+		struct usb_dev_handle **out);
+
+#endif // JTAG_USB_COMMON_H