libusb: introduce jtag_libusb_choose_interface() and use it for JLink

[openocd] / src / jtag / drivers / libusb1_common.c

diff --git a/src/jtag/drivers/libusb1_common.c b/src/jtag/drivers/libusb1_common.c
index 07d9f9512ce9aed6f3947198591f2586e2fdc2d7..bda91ffbc0a811157d1c8eb970fe39ffa46c0843 100644 (file)
--- a/src/jtag/drivers/libusb1_common.c
+++ b/src/jtag/drivers/libusb1_common.c
@@ -186,40 +186,54 @@ int jtag_libusb_set_configuration(jtag_libusb_device_handle *devh,
        return retCode;
 }
 
-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);
        const struct libusb_interface *inter;
        const struct libusb_interface_descriptor *interdesc;
        const struct libusb_endpoint_descriptor *epdesc;
        struct libusb_config_descriptor *config;
 
+       *usb_read_ep = *usb_write_ep = 0;
+
        libusb_get_config_descriptor(udev, 0, &config);
        for (int i = 0; i < (int)config->bNumInterfaces; i++) {
                inter = &config->interface[i];
 
-               for (int j = 0; j < inter->num_altsetting; j++) {
-                       interdesc = &inter->altsetting[j];
-                       for (int k = 0;
-                               k < (int)interdesc->bNumEndpoints; k++) {
-                               epdesc = &interdesc->endpoint[k];
-
-                               uint8_t epnum = epdesc->bEndpointAddress;
-                               bool is_input = epnum & 0x80;
-                               LOG_DEBUG("usb ep %s %02x",
-                                       is_input ? "in" : "out", epnum);
-
-                               if (is_input)
-                                       *usb_read_ep = epnum;
-                               else
-                                       *usb_write_ep = epnum;
+               interdesc = &inter->altsetting[0];
+               for (int k = 0;
+                    k < (int)interdesc->bNumEndpoints; k++) {
+                       if ((bclass > 0 && interdesc->bInterfaceClass != bclass) ||
+                           (subclass > 0 && interdesc->bInterfaceSubClass != subclass) ||
+                           (protocol > 0 && interdesc->bInterfaceProtocol != protocol))
+                               continue;
+
+                       epdesc = &interdesc->endpoint[k];
+
+                       uint8_t epnum = epdesc->bEndpointAddress;
+                       bool is_input = epnum & 0x80;
+                       LOG_DEBUG("usb ep %s %02x",
+                                 is_input ? "in" : "out", epnum);
+
+                       if (is_input)
+                               *usb_read_ep = epnum;
+                       else
+                               *usb_write_ep = epnum;
+
+                       if (*usb_read_ep && *usb_write_ep) {
+                               LOG_DEBUG("Claiming interface %d", (int)interdesc->bInterfaceNumber);
+                               libusb_claim_interface(devh, (int)interdesc->bInterfaceNumber);
+                               libusb_free_config_descriptor(config);
+                               return ERROR_OK;
                        }
                }
        }
        libusb_free_config_descriptor(config);
 
-       return 0;
+       return ERROR_FAIL;
 }
 
 int jtag_libusb_get_pid(struct jtag_libusb_device *dev, uint16_t *pid)