int xusb_claim_interface(struct xusb *xusb)
{
const struct usb_device_descriptor *dev_desc;
int ret;
assert(xusb);
xusb_open(xusb); /* If it's not open yet... */
if (usb_claim_interface(xusb->handle, xusb->interface_num) != 0) {
ERR("usb_claim_interface %d in '%s': %s\n",
xusb->interface_num,
xusb->devpath_tail,
usb_strerror());
return 0;
}
xusb->is_claimed = 1;
xusb_fill_strings(xusb);
dev_desc = &xusb->dev->descriptor;
DBG("ID=%04X:%04X Manufacturer=[%s] Product=[%s] "
"SerialNumber=[%s] Interface=[%s]\n",
dev_desc->idVendor,
dev_desc->idProduct,
xusb->iManufacturer,
xusb->iProduct,
xusb->iSerialNumber,
xusb->iInterface);
if (xtalk_option_use_clear_halt()) {
DBG("Using clear_halt()\n");
if (usb_clear_halt(xusb->handle, EP_OUT(xusb)) != 0) {
ERR("Clearing output endpoint: %s\n", usb_strerror());
return 0;
}
if (usb_clear_halt(xusb->handle, EP_IN(xusb)) != 0) {
ERR("Clearing input endpoint: %s\n", usb_strerror());
return 0;
}
}
ret = xusb_flushread(xusb);
if (ret < 0) {
ERR("xusb_flushread failed: %d\n", ret);
return 0;
}
return 1;
}
static struct xusb *xusb_new(struct usb_device *dev, const struct xusb_spec *spec)
{
struct usb_device_descriptor *dev_desc;
struct usb_config_descriptor *config_desc;
struct usb_interface *interface;
struct usb_interface_descriptor *iface_desc;
struct usb_endpoint_descriptor *endpoint;
size_t max_packet_size;
int i;
struct xusb *xusb = NULL;
/*
* Get information from the usb_device
*/
if((dev_desc = &dev->descriptor) == NULL) {
ERR("usb device without a device descriptor\n");
goto fail;
}
if((config_desc = dev->config) == NULL) {
ERR("usb device without a configuration descriptor\n");
goto fail;
}
interface = &config_desc->interface[spec->my_interface_num];
iface_desc = interface->altsetting;
endpoint = iface_desc->endpoint;
/* Calculate max packet size */
max_packet_size = PACKET_SIZE;
for(i = 0; i < iface_desc->bNumEndpoints; i++, endpoint++) {
DBG("Validating endpoint @ %d (interface %d)\n", i, spec->my_interface_num);
if(endpoint->bEndpointAddress == spec->my_ep_out || endpoint->bEndpointAddress == spec->my_ep_in) {
if(endpoint->wMaxPacketSize > PACKET_SIZE) {
ERR("Endpoint #%d wMaxPacketSize too large (%d)\n", i, endpoint->wMaxPacketSize);
goto fail;
}
if(endpoint->wMaxPacketSize < max_packet_size) {
max_packet_size = endpoint->wMaxPacketSize;
}
}
}
/* Fill xusb */
if((xusb = malloc(sizeof(*xusb))) == NULL) {
ERR("Out of memory");
goto fail;
}
memset(xusb, 0, sizeof(*xusb));
xusb->dev = dev;
xusb->spec = spec;
sscanf(dev->bus->dirname, "%d", &xusb->bus_num);
sscanf(dev->filename, "%d", &xusb->device_num);
snprintf(xusb->devpath_tail, PATH_MAX, "%03d/%03d",
xusb->bus_num, xusb->device_num);
xusb->interface_num = spec->my_interface_num;
xusb->ep_out = spec->my_ep_out;
xusb->ep_in = spec->my_ep_in;
xusb->packet_size = max_packet_size;
xusb->is_usb2 = (max_packet_size == 512);
if (! xusb_open(xusb)) {
ERR("Failed opening device: %04X:%04X - %s\n",
dev_desc->idVendor,
dev_desc->idProduct,
xusb->devpath_tail);
goto fail;
}
DBG("%04X:%04X - %s\n",
dev_desc->idVendor,
dev_desc->idProduct,
xusb->devpath_tail);
return xusb;
fail:
xusb_destroy(xusb);
return NULL;
}