* taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
*/
#ifndef __GNUC__
-# define __attribute__(x) /*NOTHING*/
+# define __attribute__(x) /* NOTHING */
#endif
/* Control shared library symbols visibility */
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;
}
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;
}
static int open_device(am7xxx_context *ctx,
unsigned int device_index,
- libusb_device* usb_dev,
+ libusb_device *usb_dev,
am7xxx_device **dev)
{
int ret;
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;
}
current_configuration = -1;
libusb_get_configuration((*dev)->usb_device, ¤t_configuration);
if (current_configuration != (*dev)->desc->configuration) {
+ /*
+ * In principle kernel drivers bound to each interface should
+ * be detached before setting the configuration, but in
+ * practice this is not necessary for most devices.
+ *
+ * For example something like the following function would be
+ * called:
+ * libusb_detach_all_kernel_drivers((*dev)->usb_device);
+ */
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;
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;
current_configuration = -1;
libusb_get_configuration((*dev)->usb_device, ¤t_configuration);
if (current_configuration != (*dev)->desc->configuration) {
- debug(ctx, "libusb configuration changed\n");
- debug(ctx, "Cannot claim interface %hhu\n",
- (*dev)->desc->interface_number);
+ debug(ctx, "libusb configuration changed (expected: %hhu, current: %hhu\n",
+ (*dev)->desc->configuration, current_configuration);
+ ret = -EINVAL;
goto out_libusb_close;
}
out:
unsigned int open_device_index, am7xxx_device **dev)
{
ssize_t num_devices;
- libusb_device** list;
+ libusb_device **list;
unsigned int current_index;
int i;
int ret;