libusb: introduce jtag_libusb_choose_interface() and use it for JLink

[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 b44b7861b7b70f20747430d453a5eaded02d8764..5b1248d2635b1faaa1840bd6145ecfa3c6ef8d87 100644 (file)
--- a/src/jtag/drivers/libusb0_common.c
+++ b/src/jtag/drivers/libusb0_common.c
@@ -145,14 +145,23 @@ int jtag_libusb_set_configuration(jtag_libusb_device_handle *devh,
                        udev->config[configuration].bConfigurationValue);
 }
 
-int jtag_libusb_get_endpoints(struct jtag_libusb_device *udev,
+int jtag_libusb_choose_interface(struct jtag_libusb_device_handle *devh,
                unsigned int *usb_read_ep,
-               unsigned int *usb_write_ep)
+               unsigned int *usb_write_ep,
+               int bclass, int subclass, int protocol)
 {
+       struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
        struct usb_interface *iface = udev->config->interface;
        struct usb_interface_descriptor *desc = iface->altsetting;
 
+       *usb_read_ep = *usb_write_ep = 0;
+
        for (int i = 0; i < desc->bNumEndpoints; i++) {
+               if ((bclass > 0 && desc->bInterfaceClass != bclass) ||
+                   (subclass > 0 && desc->bInterfaceSubClass != subclass) ||
+                   (protocol > 0 && desc->bInterfaceProtocol != protocol))
+                       continue;
+
                uint8_t epnum = desc->endpoint[i].bEndpointAddress;
                bool is_input = epnum & 0x80;
                LOG_DEBUG("usb ep %s %02x", is_input ? "in" : "out", epnum);
@@ -160,9 +169,15 @@ int jtag_libusb_get_endpoints(struct jtag_libusb_device *udev,
                        *usb_read_ep = epnum;
                else
                        *usb_write_ep = epnum;
+
+               if (*usb_read_ep && *usb_write_ep) {
+                       LOG_DEBUG("Claiming interface %d", (int)desc->bInterfaceNumber);
+                       usb_claim_interface(devh, (int)desc->bInterfaceNumber);
+                       return ERROR_OK;
+               }
        }
 
-       return 0;
+       return ERROR_FAIL;
 }
 
 int jtag_libusb_get_pid(struct jtag_libusb_device *dev, uint16_t *pid)