int
usb_find_devices(void)
{
struct libusb20_device *pdev;
struct usb_device *udev;
struct LIBUSB20_DEVICE_DESC_DECODED *ddesc;
int devnum;
int err;
/* cleanup after last device search */
/* close all opened devices, if any */
while ((pdev = libusb20_be_device_foreach(usb_backend, NULL))) {
udev = pdev->privLuData;
libusb20_be_dequeue_device(usb_backend, pdev);
libusb20_dev_free(pdev);
if (udev != NULL) {
LIST_DEL(usb_global_bus.devices, udev);
free(udev);
}
}
/* free old USB backend, if any */
libusb20_be_free(usb_backend);
/* do a new backend device search */
usb_backend = libusb20_be_alloc_default();
if (usb_backend == NULL) {
return (-1);
}
/* iterate all devices */
devnum = 1;
pdev = NULL;
while ((pdev = libusb20_be_device_foreach(usb_backend, pdev))) {
udev = malloc(sizeof(*udev));
if (udev == NULL)
break;
memset(udev, 0, sizeof(*udev));
udev->bus = &usb_global_bus;
snprintf(udev->filename, sizeof(udev->filename),
"/dev/ugen%u.%u",
libusb20_dev_get_bus_number(pdev),
libusb20_dev_get_address(pdev));
ddesc = libusb20_dev_get_device_desc(pdev);
udev->descriptor.bLength = sizeof(udev->descriptor);
udev->descriptor.bDescriptorType = ddesc->bDescriptorType;
udev->descriptor.bcdUSB = ddesc->bcdUSB;
udev->descriptor.bDeviceClass = ddesc->bDeviceClass;
udev->descriptor.bDeviceSubClass = ddesc->bDeviceSubClass;
udev->descriptor.bDeviceProtocol = ddesc->bDeviceProtocol;
udev->descriptor.bMaxPacketSize0 = ddesc->bMaxPacketSize0;
udev->descriptor.idVendor = ddesc->idVendor;
udev->descriptor.idProduct = ddesc->idProduct;
udev->descriptor.bcdDevice = ddesc->bcdDevice;
udev->descriptor.iManufacturer = ddesc->iManufacturer;
udev->descriptor.iProduct = ddesc->iProduct;
udev->descriptor.iSerialNumber = ddesc->iSerialNumber;
udev->descriptor.bNumConfigurations =
ddesc->bNumConfigurations;
if (udev->descriptor.bNumConfigurations > USB_MAXCONFIG) {
/* truncate number of configurations */
udev->descriptor.bNumConfigurations = USB_MAXCONFIG;
}
udev->devnum = devnum++;
/* link together the two structures */
udev->dev = pdev;
pdev->privLuData = udev;
err = libusb20_dev_open(pdev, 0);
if (err == 0) {
/* XXX get all config descriptors by default */
usb_fetch_and_parse_descriptors((void *)pdev);
libusb20_dev_close(pdev);
}
LIST_ADD(usb_global_bus.devices, udev);
}
return (devnum - 1); /* success */
}
int usb_find_devices(void)
{
struct usb_bus *bus;
int ret, changes = 0;
for (bus = usb_busses; bus; bus = bus->next) {
struct usb_device *devices, *dev;
/* Find all of the devices and put them into a temporary list */
ret = usb_os_find_devices(bus, &devices);
if (ret < 0)
return ret;
/*
* Now walk through all of the devices we know about and compare
* against this new list. Any duplicates will be removed from the new
* list. If we don't find it in the new list, the device was removed.
* Any devices still in the new list, are new to us.
*/
dev = bus->devices;
while (dev) {
int found = 0;
struct usb_device *ndev, *tdev = dev->next;
ndev = devices;
while (ndev) {
struct usb_device *tndev = ndev->next;
if (!strcmp(dev->filename, ndev->filename)) {
/* Remove it from the new devices list */
LIST_DEL(devices, ndev);
usb_free_dev(ndev);
found = 1;
break;
}
ndev = tndev;
}
if (!found) {
/* The device was removed from the system */
LIST_DEL(bus->devices, dev);
usb_free_dev(dev);
changes++;
}
dev = tdev;
}
/*
* Anything on the *devices list is new. So add them to bus->devices and
* process them like the new device it is.
*/
dev = devices;
while (dev) {
struct usb_device *tdev = dev->next;
/*
* Remove it from the temporary list first and add it to the real
* bus->devices list.
*/
LIST_DEL(devices, dev);
LIST_ADD(bus->devices, dev);
/*
* Some ports fetch the descriptors on scanning (like Linux) so we don't
* need to fetch them again.
*/
if (!dev->config) {
usb_dev_handle *udev;
udev = usb_open(dev);
if (udev) {
usb_fetch_and_parse_descriptors(udev);
usb_close(udev);
}
}
changes++;
dev = tdev;
}
usb_os_determine_children(bus);
}
return changes;
}
