@@ -830,6 +830,24 @@ static uint8_t usb_linux_get_alt_setting(USBHostDevice *s,
struct usb_ctrltransfer ct;
int ret;
+ if (usb_fs_type == USB_FS_SYS) {
+ char device_name[64], line[1024];
+ int alt_setting;
+
+ sprintf(device_name, "%d-%d:%d.%d", s->bus_num, s->devpath,
+ (int)configuration, (int)interface);
+
+ if (!usb_host_read_file(line, sizeof(line), "bAlternateSetting",
+ device_name)) {
+ goto usbdevfs;
+ }
+ if (sscanf(line, "%d", &alt_setting) != 1) {
+ goto usbdevfs;
+ }
+ return alt_setting;
+ }
+
+usbdevfs:
ct.bRequestType = USB_DIR_IN | USB_RECIP_INTERFACE;
ct.bRequest = USB_REQ_GET_INTERFACE;
ct.wValue = 0;