am7xxx: use libusb_error_name to print the return value of libusb calls

This makes the debug output more useful.

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 1b3b758..ecec7d7 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -385,8 +385,8 @@ static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 
        ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
        if (ret != 0 || (unsigned int)transferred != len) {
-               error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
-                     ret, transferred, len);
+               error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
+                     libusb_error_name(ret), transferred, len);
                return ret;
        }
 
@@ -404,8 +404,8 @@ static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 
        ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
        if (ret != 0 || (unsigned int)transferred != len) {
-               error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
-                     ret, transferred, len);
+               error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
+                     libusb_error_name(ret), transferred, len);
                return ret;
        }
 
@@ -725,7 +725,7 @@ static int open_device(am7xxx_context *ctx,
 
        ret = libusb_open(usb_dev, &((*dev)->usb_device));
        if (ret < 0) {
-               debug(ctx, "libusb_open failed\n");
+               debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
                goto out;
        }
 
@@ -739,7 +739,8 @@ static int open_device(am7xxx_context *ctx,
                ret = libusb_set_configuration((*dev)->usb_device,
                                               (*dev)->desc->configuration);
                if (ret < 0) {
-                       debug(ctx, "libusb_set_configuration failed\n");
+                       debug(ctx, "libusb_set_configuration failed: %s\n",
+                             libusb_error_name(ret));
                        debug(ctx, "Cannot set configuration %hhu\n",
                              (*dev)->desc->configuration);
                        goto out_libusb_close;
@@ -751,7 +752,8 @@ static int open_device(am7xxx_context *ctx,
        ret = libusb_claim_interface((*dev)->usb_device,
                                     (*dev)->desc->interface_number);
        if (ret < 0) {
-               debug(ctx, "libusb_claim_interface failed\n");
+               debug(ctx, "libusb_claim_interface failed: %s\n",
+                     libusb_error_name(ret));
                debug(ctx, "Cannot claim interface %hhu\n",
                      (*dev)->desc->interface_number);
                goto out_libusb_close;