diff options
Diffstat (limited to 'gusb/gusb-device.c')
| -rw-r--r-- | gusb/gusb-device.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/gusb/gusb-device.c b/gusb/gusb-device.c index 815e3bb..ca53653 100644 --- a/gusb/gusb-device.c +++ b/gusb/gusb-device.c @@ -420,6 +420,64 @@ g_usb_device_open (GUsbDevice *device, } /** + * g_usb_device_get_custom_index: + * @device: a #GUsbDevice + * @class_id: a device class, e.g. 0xff for VENDOR + * @subclass_id: a device subclass + * @protocol_id: a protocol number + * @error: a #GError, or %NULL + * + * Gets the string index from the vendor class interface descriptor. + * + * Return value: a non-zero index, or 0x00 for failure + * + * Since: 0.2.5 + **/ +guint8 +g_usb_device_get_custom_index (GUsbDevice *device, + guint8 class_id, + guint8 subclass_id, + guint8 protocol_id, + GError **error) +{ + const struct libusb_interface_descriptor *ifp; + gint rc; + guint8 idx = 0x00; + guint i; + struct libusb_config_descriptor *config; + + rc = libusb_get_active_config_descriptor (device->priv->device, &config); + if (!g_usb_device_libusb_error_to_gerror (device, rc, error)) + return NULL; + + /* find the right data */ + for (i = 0; i < config->bNumInterfaces; i++) { + ifp = &config->interface[i].altsetting[0]; + if (ifp->bInterfaceClass != class_id) + continue; + if (ifp->bInterfaceSubClass != subclass_id) + continue; + if (ifp->bInterfaceProtocol != protocol_id) + continue; + idx = ifp->iInterface; + break; + } + + /* nothing matched */ + if (idx == 0x00) { + g_set_error (error, + G_USB_DEVICE_ERROR, + G_USB_DEVICE_ERROR_NOT_SUPPORTED, + "no vendor descriptor for class 0x%02x, " + "subclass 0x%02x and protocol 0x%02x", + class_id, subclass_id, protocol_id); + } + + libusb_free_config_descriptor (config); + return idx; +} + +/** * g_usb_device_close: * @device: a #GUsbDevice * @error: a #GError, or %NULL |