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/*
* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "usb_if.h"
/* Return 0 on error, since it's never gonna be EP 0 */
static int find_endpoint(const struct libusb_interface_descriptor *iface,
uint16_t subclass,
uint16_t protocol,
struct usb_endpoint *uep)
{
const struct libusb_endpoint_descriptor *ep;
if (iface->bInterfaceClass == 255 &&
iface->bInterfaceSubClass == subclass &&
iface->bInterfaceProtocol == protocol &&
iface->bNumEndpoints) {
ep = &iface->endpoint[0];
uep->ep_num = ep->bEndpointAddress & 0x7f;
uep->chunk_len = ep->wMaxPacketSize;
return 1;
}
return 0;
}
/* Return -1 on error */
static int find_interface(uint16_t subclass,
uint16_t protocol,
struct usb_endpoint *uep)
{
int iface_num = -1;
int r, i, j;
struct libusb_device *dev;
struct libusb_config_descriptor *conf = 0;
const struct libusb_interface *iface0;
const struct libusb_interface_descriptor *iface;
dev = libusb_get_device(uep->devh);
r = libusb_get_active_config_descriptor(dev, &conf);
if (r < 0) {
USB_ERROR("libusb_get_active_config_descriptor", r);
goto out;
}
for (i = 0; i < conf->bNumInterfaces; i++) {
iface0 = &conf->interface[i];
for (j = 0; j < iface0->num_altsetting; j++) {
iface = &iface0->altsetting[j];
if (find_endpoint(iface, subclass, protocol, uep)) {
iface_num = i;
goto out;
}
}
}
out:
libusb_free_config_descriptor(conf);
return iface_num;
}
int usb_findit(uint16_t vid, uint16_t pid, uint16_t subclass,
uint16_t protocol, struct usb_endpoint *uep)
{
int iface_num, r;
memset(uep, 0, sizeof(*uep));
r = libusb_init(NULL);
if (r < 0) {
USB_ERROR("libusb_init", r);
return -1;
}
printf("open_device %04x:%04x\n", vid, pid);
/* NOTE: This doesn't handle multiple matches! */
uep->devh = libusb_open_device_with_vid_pid(NULL, vid, pid);
if (!uep->devh) {
fprintf(stderr, "Can't find device\n");
return -1;
}
iface_num = find_interface(subclass, protocol, uep);
if (iface_num < 0) {
fprintf(stderr, "USB FW update not supported by that device\n");
usb_shut_down(uep);
}
if (!uep->chunk_len) {
fprintf(stderr, "wMaxPacketSize isn't valid\n");
usb_shut_down(uep);
}
printf("found interface %d endpoint %d, chunk_len %d\n",
iface_num, uep->ep_num, uep->chunk_len);
libusb_set_auto_detach_kernel_driver(uep->devh, 1);
r = libusb_claim_interface(uep->devh, iface_num);
if (r < 0) {
USB_ERROR("libusb_claim_interface", r);
usb_shut_down(uep);
}
printf("READY\n-------\n");
return 0;
}
int usb_trx(struct usb_endpoint *uep, void *outbuf, int outlen,
void *inbuf, int inlen, int allow_less, size_t *rxed_count)
{
int r, actual;
/* Send data out */
if (outbuf && outlen) {
actual = 0;
r = libusb_bulk_transfer(uep->devh, uep->ep_num,
outbuf, outlen,
&actual, 1000);
if (r < 0) {
USB_ERROR("libusb_bulk_transfer", r);
return -1;
}
if (actual != outlen) {
fprintf(stderr, "%s:%d, only sent %d/%d bytes\n",
__FILE__, __LINE__, actual, outlen);
usb_shut_down(uep);
}
}
/* Read reply back */
if (inbuf && inlen) {
actual = 0;
r = libusb_bulk_transfer(uep->devh, uep->ep_num | 0x80,
inbuf, inlen,
&actual, 1000);
if (r < 0) {
USB_ERROR("libusb_bulk_transfer", r);
return -1;
}
if ((actual != inlen) && !allow_less) {
fprintf(stderr, "%s:%d, only received %d/%d bytes\n",
__FILE__, __LINE__, actual, inlen);
usb_shut_down(uep);
}
if (rxed_count)
*rxed_count = actual;
}
return 0;
}
void usb_shut_down(struct usb_endpoint *uep)
{
libusb_close(uep->devh);
libusb_exit(NULL);
}
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