const UsbHidDescriptor *
usbHidDescriptor (UsbDevice *device) {
const UsbDescriptor *descriptor = NULL;
while (usbNextDescriptor(device, &descriptor))
if (descriptor->endpoint.bDescriptorType == UsbDescriptorType_HID)
return &descriptor->hid;
logMessage(LOG_WARNING, "USB: HID descriptor not found");
errno = ENOENT;
return NULL;
}
static const UsbInterfaceDescriptor *
usbFindCommunicationInterface (UsbDevice *device) {
const UsbDescriptor *descriptor = NULL;
while (usbNextDescriptor(device, &descriptor)) {
if (descriptor->header.bDescriptorType == UsbDescriptorType_Interface) {
if (descriptor->interface.bInterfaceClass == 0X02) {
return &descriptor->interface;
}
}
}
logMessage(LOG_WARNING, "USB: communication interface descriptor not found");
errno = ENOENT;
return NULL;
}
unsigned int
usbAlternativeCount (
UsbDevice *device,
unsigned char interface
) {
unsigned int count = 0;
const UsbDescriptor *descriptor = NULL;
while (usbNextDescriptor(device, &descriptor)) {
if (descriptor->interface.bDescriptorType == UsbDescriptorType_Interface)
if (descriptor->interface.bInterfaceNumber == interface)
count += 1;
}
return count;
}
const UsbEndpointDescriptor *
usbEndpointDescriptor (
UsbDevice *device,
unsigned char endpointAddress
) {
const UsbDescriptor *descriptor = NULL;
while (usbNextDescriptor(device, &descriptor)) {
if (descriptor->endpoint.bDescriptorType == UsbDescriptorType_Endpoint)
if (descriptor->endpoint.bEndpointAddress == endpointAddress)
return &descriptor->endpoint;
}
logMessage(LOG_WARNING, "USB: endpoint descriptor not found: %02X", endpointAddress);
errno = ENOENT;
return NULL;
}
const UsbInterfaceDescriptor *
usbInterfaceDescriptor (
UsbDevice *device,
unsigned char interface,
unsigned char alternative
) {
const UsbDescriptor *descriptor = NULL;
while (usbNextDescriptor(device, &descriptor)) {
if (descriptor->interface.bDescriptorType == UsbDescriptorType_Interface)
if (descriptor->interface.bInterfaceNumber == interface)
if (descriptor->interface.bAlternateSetting == alternative)
return &descriptor->interface;
}
logMessage(LOG_WARNING, "USB: interface descriptor not found: %d.%d", interface, alternative);
errno = ENOENT;
return NULL;
}
static const UsbEndpointDescriptor *
usbFindInterruptInputEndpoint (UsbDevice *device, const UsbInterfaceDescriptor *interface) {
const UsbDescriptor *descriptor = (const UsbDescriptor *)interface;
while (usbNextDescriptor(device, &descriptor)) {
if (descriptor->header.bDescriptorType == UsbDescriptorType_Interface) break;
if (descriptor->header.bDescriptorType == UsbDescriptorType_Endpoint) {
if (USB_ENDPOINT_DIRECTION(&descriptor->endpoint) == UsbEndpointDirection_Input) {
if (USB_ENDPOINT_TRANSFER(&descriptor->endpoint) == UsbEndpointTransfer_Interrupt) {
return &descriptor->endpoint;
}
}
}
}
logMessage(LOG_WARNING, "USB: interrupt input endpoint descriptor not found");
errno = ENOENT;
return NULL;
}