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/*
* Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <libusb.h>
#include "lg-downloader.h"
#include "usb.h"
int usb_open(struct context *context)
{
struct libusb_device_handle *handle;
int configuration;
int rc;
if (context == NULL)
return -1;
rc = libusb_init(NULL);
if (rc < 0) {
fprintf(stderr, "Initializing USB failed\n");
return -1;
}
do {
handle = libusb_open_device_with_vid_pid(NULL, USB_VENDOR_LG, USB_DEVICE_DOWNLOAD);
if (handle != NULL)
break;
usleep(300000);
} while (context->wait);
if (handle == NULL) {
fprintf(stderr, "Finding and opening USB device failed\n");
fprintf(stderr, "\nDevice might be missing or you may not have the rights to do this\n");
goto error;
}
libusb_detach_kernel_driver(handle, USB_INTERFACE);
rc = libusb_get_configuration(handle, &configuration);
if (rc < 0) {
fprintf(stderr, "Getting USB configuration failed\n");
goto error;
}
if (configuration != USB_CONFIGURATION) {
rc = libusb_set_configuration(handle, USB_CONFIGURATION);
if (rc < 0) {
fprintf(stderr, "Setting USB configuration failed\n");
goto error;
}
}
rc = libusb_claim_interface(handle, USB_INTERFACE);
if (rc < 0) {
fprintf(stderr, "Claiming USB interface failed\n");
goto error;
}
context->usb_handle = handle;
rc = 0;
goto complete;
error:
rc = -1;
if (handle != NULL)
libusb_close(handle);
libusb_exit(NULL);
complete:
return rc;
}
void usb_close(struct context *context)
{
if (context == NULL)
return;
if (context->usb_handle != NULL) {
libusb_release_interface(context->usb_handle, USB_INTERFACE);
libusb_close(context->usb_handle);
context->usb_handle = NULL;
libusb_exit(NULL);
}
}
int usb_send(struct context *context, const void *data, size_t size)
{
size_t count;
size_t chunk;
uint8_t *p;
int transferred;
int rc;
if (context == NULL)
return -1;
count = 0;
p = (uint8_t *) data;
while (count < size) {
chunk = (size - count) < USB_SEND_CHUNK ? (size - count) : USB_SEND_CHUNK;
rc = libusb_bulk_transfer(context->usb_handle, USB_ENDPOINT_OUT, p, chunk, &transferred, USB_TIMEOUT);
if (rc < 0 || transferred <= 0) {
fprintf(stderr, "Bulk USB transfer failed\n");
return -1;
}
count += transferred;
p += transferred;
}
return 0;
}
int usb_recv(struct context *context, void *data, size_t size)
{
size_t count;
size_t chunk;
uint8_t *p;
int transferred;
int rc;
if (context == NULL)
return -1;
count = 0;
p = (uint8_t *) data;
while (count < size) {
chunk = (size - count) < USB_RECV_CHUNK ? (size - count) : USB_RECV_CHUNK;
rc = libusb_bulk_transfer(context->usb_handle, USB_ENDPOINT_IN, p, chunk, &transferred, USB_TIMEOUT);
if (rc < 0 || transferred <= 0) {
fprintf(stderr, "Bulk USB transfer failed\n");
return -1;
}
count += transferred;
p += transferred;
}
return 0;
}
int usb_recv_available(struct context *context, void *data, size_t size)
{
size_t chunk;
int transferred;
int rc;
if (context == NULL)
return -1;
chunk = size < USB_RECV_CHUNK ? size : USB_RECV_CHUNK;
rc = libusb_bulk_transfer(context->usb_handle, USB_ENDPOINT_IN, data, chunk, &transferred, USB_TIMEOUT);
if (rc < 0 || transferred <= 0) {
fprintf(stderr, "Bulk USB transfer failed\n");
return -1;
}
return transferred;
}
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