lib: fall back to iface 1 in case iface 0 altsetting 1 fails

Some people on the mailing list reported that with older kernels
setting interface 0 altsetting 1 does not work, fall back to the
old behavior in this case for now, while still investigating the
root cause of this problem.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/libosmo-fl2k.c b/src/libosmo-fl2k.c
index 7478893..9ebe130 100644
--- a/src/libosmo-fl2k.c
+++ b/src/libosmo-fl2k.c
@@ -447,8 +447,13 @@ int fl2k_open(fl2k_dev_t **out_dev, uint32_t index)
 
 	r = libusb_set_interface_alt_setting(dev->devh, 0, 1);
 	if (r < 0) {
-		fprintf(stderr, "Error enabling IF 0 altsetting 1: %d\n", r);
-		goto err;
+		fprintf(stderr, "Failed to switch interface 0 to "
+				"altsetting 1, trying to use interface 1\n");
+
+		r = libusb_claim_interface(dev->devh, 1);
+		if (r < 0) {
+			fprintf(stderr, "Could not claim interface 1: %d\n", r);
+		}
 	}
 
 	r = fl2k_init_device(dev);