95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* simtrace2-discovery - host PC library to scan for matching USB
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* devices
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*
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* (C) 2016 by Harald Welte <hwelte@hmw-consulting.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdint.h>
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#include <libusb.h>
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/*! \brief obtain the endpoint addresses for a given USB interface */
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int get_usb_ep_addrs(libusb_device_handle *devh, unsigned int if_num,
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uint8_t *out, uint8_t *in, uint8_t *irq)
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{
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libusb_device *dev = libusb_get_device(devh);
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struct libusb_config_descriptor *cdesc;
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const struct libusb_interface_descriptor *idesc;
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const struct libusb_interface *iface;
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int rc, l;
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rc = libusb_get_active_config_descriptor(dev, &cdesc);
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if (rc < 0)
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return rc;
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iface = &cdesc->interface[if_num];
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/* FIXME: we assume there's no altsetting */
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idesc = &iface->altsetting[0];
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for (l = 0; l < idesc->bNumEndpoints; l++) {
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const struct libusb_endpoint_descriptor *edesc = &idesc->endpoint[l];
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switch (edesc->bmAttributes & 3) {
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case LIBUSB_TRANSFER_TYPE_BULK:
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if (edesc->bEndpointAddress & 0x80) {
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if (in)
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*in = edesc->bEndpointAddress;
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} else {
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if (out)
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*out = edesc->bEndpointAddress;
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}
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break;
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case LIBUSB_TRANSFER_TYPE_INTERRUPT:
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if (irq)
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*irq = edesc->bEndpointAddress;
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break;
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default:
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break;
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}
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}
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return 0;
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}
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#if 0
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struct libusb_device_descriptor ddesc;
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int rc, i, j, k;
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rc = libusb_get_device_descriptor(devh, &ddesc);
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if (rc < 0)
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return;
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for (i = 0; i < ddesc.bNumConfigurations; i++) {
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struct libusb_config_descriptor *cdesc;
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rc = libusb_get_config_descriptor(devh, i, &cdesc);
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if (rc < 0)
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return;
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for (j = 0; j < cdesc->bNumInterfaces; j++) {
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const struct libusb_interface *iface = cdesc->interface[j];
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for (k = 0; k < iface->num_altsetting; k++) {
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const struct libusb_interface_descriptor *idesc = iface->altsetting[k];
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/* make sure this is the interface we're looking for */
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if (idesc->bInterfaceClass != 0xFF ||
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idesc->bInterfaceSubClass != if_class ||
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idsec->bInterfaceProtocol != if_proto)
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continue;
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/* FIXME */
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}
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}
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libusb_free_config_descriptor(cdesc);
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}
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#endif
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