jtag: drivers: provide initial support for usb path filtering
[openocd.git] / src / jtag / drivers / libusb1_common.c
index ec52a1b..d96ac76 100644 (file)
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
-#include "log.h"
+#include <jtag/drivers/jtag_usb_common.h>
 #include "libusb1_common.h"
+#include "log.h"
+
+/*
+ * comment from libusb:
+ * As per the USB 3.0 specs, the current maximum limit for the depth is 7.
+ */
+#define MAX_USB_PORTS  7
 
 static struct libusb_context *jtag_libusb_context; /**< Libusb context **/
 static libusb_device **devs; /**< The usb device list **/
@@ -38,6 +45,31 @@ static bool jtag_libusb_match(struct libusb_device_descriptor *dev_desc,
        return false;
 }
 
+#ifdef HAVE_LIBUSB_GET_PORT_NUMBERS
+static bool jtag_libusb_location_equal(libusb_device *device)
+{
+       uint8_t port_path[MAX_USB_PORTS];
+       uint8_t dev_bus;
+       int path_len;
+
+       path_len = libusb_get_port_numbers(device, port_path, MAX_USB_PORTS);
+       if (path_len == LIBUSB_ERROR_OVERFLOW) {
+               LOG_WARNING("cannot determine path to usb device! (more than %i ports in path)\n",
+                       MAX_USB_PORTS);
+               return false;
+       }
+       dev_bus = libusb_get_bus_number(device);
+
+       return jtag_usb_location_equal(dev_bus, port_path, path_len);
+}
+#else /* HAVE_LIBUSB_GET_PORT_NUMBERS */
+static bool jtag_libusb_location_equal(libusb_device *device)
+{
+       return true;
+}
+#endif /* HAVE_LIBUSB_GET_PORT_NUMBERS */
+
+
 /* Returns true if the string descriptor indexed by str_index in device matches string */
 static bool string_descriptor_equal(libusb_device_handle *device, uint8_t str_index,
                                                                        const char *string)
@@ -89,6 +121,9 @@ int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
                if (!jtag_libusb_match(&dev_desc, vids, pids))
                        continue;
 
+               if (jtag_usb_get_location() && !jtag_libusb_location_equal(devs[idx]))
+                       continue;
+
                errCode = libusb_open(devs[idx], &libusb_handle);
 
                if (errCode) {