ssize_t
usbControlTransfer (
UsbDevice *device,
uint8_t direction,
uint8_t recipient,
uint8_t type,
uint8_t request,
uint16_t value,
uint16_t index,
void *buffer,
uint16_t length,
int timeout
) {
UsbDeviceExtension *devx = device->extension;
if (usbOpenUsbfsFile(devx)) {
union {
struct usbdevfs_ctrltransfer transfer;
UsbSetupPacket setup;
} arg;
memset(&arg, 0, sizeof(arg));
arg.setup.bRequestType = direction | recipient | type;
arg.setup.bRequest = request;
putLittleEndian16(&arg.setup.wValue, value);
putLittleEndian16(&arg.setup.wIndex, index);
putLittleEndian16(&arg.setup.wLength, length);
arg.transfer.data = buffer;
arg.transfer.timeout = timeout;
usbLogSetupPacket(&arg.setup);
if (direction == UsbControlDirection_Output) {
if (length) logBytes(LOG_CATEGORY(USB_IO), "control output", buffer, length);
}
{
int count = ioctl(devx->usbfsFile, USBDEVFS_CONTROL, &arg);
if (count != -1) {
if (direction == UsbControlDirection_Input) {
logBytes(LOG_CATEGORY(USB_IO), "control input", buffer, length);
}
return count;
}
logSystemError("USB control transfer");
}
}
return -1;
}
void
usbMakeSetupPacket (
UsbSetupPacket *setup,
uint8_t direction,
uint8_t recipient,
uint8_t type,
uint8_t request,
uint16_t value,
uint16_t index,
uint16_t length
) {
setup->bRequestType = direction | recipient | type;
setup->bRequest = request;
putLittleEndian16(&setup->wValue, value);
putLittleEndian16(&setup->wIndex, index);
putLittleEndian16(&setup->wLength, length);
usbLogSetupPacket(setup);
}
ssize_t
usbControlTransfer (
UsbDevice *device,
uint8_t direction,
uint8_t recipient,
uint8_t type,
uint8_t request,
uint16_t value,
uint16_t index,
void *buffer,
uint16_t length,
int timeout
) {
UsbDeviceExtension *devx = device->extension;
UsbSetupPacket setup;
setup.bRequestType = direction | recipient | type;
setup.bRequest = request;
putLittleEndian16(&setup.wValue, value);
putLittleEndian16(&setup.wIndex, index);
putLittleEndian16(&setup.wLength, length);
switch (direction) {
case UsbControlDirection_Input: {
size_t size = sizeof(setup);
ssize_t count;
if ((count = write(devx->data, &setup, size)) == -1) {
logSystemError("USB control request");
} else if (count != size) {
logMessage(LOG_ERR, "USB truncated control request: %d < %d", count, size);
errno = EIO;
} else if ((count = read(devx->data, buffer, length)) == -1) {
logSystemError("USB control read");
} else {
return count;
}
break;
}
case UsbControlDirection_Output: {
unsigned char packet[sizeof(setup) + length];
size_t size = 0;
ssize_t count;
memcpy(&packet[size], &setup, sizeof(setup));
size += sizeof(setup);
memcpy(&packet[size], buffer, length);
size += length;
if ((count = write(devx->data, packet, size)) == -1) {
logSystemError("USB control write");
} else if (count != size) {
logMessage(LOG_ERR, "USB truncated control write: %d < %d", count, size);
errno = EIO;
} else {
return size;
}
break;
}
default:
logMessage(LOG_ERR, "USB unsupported control direction: %02X", direction);
errno = ENOSYS;
break;
}
return -1;
}