libusb: add debug message on adapter not found due to wrong serial

[openocd.git] / src / jtag / drivers / libusb0_common.c

diff --git a/src/jtag/drivers/libusb0_common.c b/src/jtag/drivers/libusb0_common.c
index 1825543e2b7dda5a5d9cc8dca8358cc4509b4479..14a8b61cc42617eb740ec9a0e358e4a2bdf00aba 100644 (file)
--- a/src/jtag/drivers/libusb0_common.c
+++ b/src/jtag/drivers/libusb0_common.c
@@ -67,7 +67,8 @@ int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
                const char *serial,
                struct jtag_libusb_device_handle **out)
 {
-       int retval = -ENODEV;
+       int retval = ERROR_FAIL;
+       bool serial_mismatch = false;
        struct jtag_libusb_device_handle *libusb_handle;
        usb_init();
 
@@ -83,21 +84,27 @@ int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
 
                        libusb_handle = usb_open(dev);
                        if (NULL == libusb_handle) {
-                               retval = -errno;
+                               LOG_ERROR("usb_open() failed with %s", usb_strerror());
                                continue;
                        }
 
                        /* Device must be open to use libusb_get_string_descriptor_ascii. */
                        if (serial != NULL &&
                                        !string_descriptor_equal(libusb_handle, dev->descriptor.iSerialNumber, serial)) {
+                               serial_mismatch = true;
                                usb_close(libusb_handle);
                                continue;
                        }
                        *out = libusb_handle;
-                       retval = 0;
+                       retval = ERROR_OK;
+                       serial_mismatch = false;
                        break;
                }
        }
+
+       if (serial_mismatch)
+               LOG_INFO("No device matches the serial string");
+
        return retval;
 }