Add Matthias Janke to AUTHORS, update ChangeLog

[libftdi] / src / ftdi.c

diff --git a/src/ftdi.c b/src/ftdi.c
index 2fff1ff..175befc 100644 (file)
--- a/src/ftdi.c
+++ b/src/ftdi.c
@@ -750,6 +750,7 @@ int ftdi_usb_open_desc(struct ftdi_context *ftdi, int vendor, int product,
     \retval -9: get serial number failed
     \retval -10: unable to close device
     \retval -11: ftdi context invalid
+    \retval -12: libusb_get_device_list() failed
 */
 int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
                              const char* description, const char* serial, unsigned int index)
@@ -824,6 +825,54 @@ int ftdi_usb_open_desc_index(struct ftdi_context *ftdi, int vendor, int product,
 }
 
 /**
+    Opens the device at a given USB bus and device address.
+
+    \param ftdi pointer to ftdi_context
+    \param bus Bus number
+    \param addr Device address
+
+    \retval  0: all fine
+    \retval -1: usb_find_busses() failed
+    \retval -2: usb_find_devices() failed
+    \retval -3: usb device not found
+    \retval -4: unable to open device
+    \retval -5: unable to claim device
+    \retval -6: reset failed
+    \retval -7: set baudrate failed
+    \retval -8: get product description failed
+    \retval -9: get serial number failed
+    \retval -10: unable to close device
+    \retval -11: ftdi context invalid
+    \retval -12: libusb_get_device_list() failed
+*/
+int ftdi_usb_open_bus_addr(struct ftdi_context *ftdi, uint8_t bus, uint8_t addr)
+{
+    libusb_device *dev;
+    libusb_device **devs;
+    int i = 0;
+
+    if (ftdi == NULL)
+        ftdi_error_return(-11, "ftdi context invalid");
+
+    if (libusb_get_device_list(ftdi->usb_ctx, &devs) < 0)
+        ftdi_error_return(-12, "libusb_get_device_list() failed");
+
+    while ((dev = devs[i++]) != NULL)
+    {
+        if (libusb_get_bus_number(dev) == bus && libusb_get_device_address(dev) == addr)
+        {
+            int res;
+            res = ftdi_usb_open_dev(ftdi, dev);
+            libusb_free_device_list(devs,1);
+            return res;
+        }
+    }
+
+    // device not found
+    ftdi_error_return_free_device_list(-3, "device not found", devs);
+}
+
+/**
     Opens the ftdi-device described by a description-string.
     Intended to be used for parsing a device-description given as commandline argument.