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/*
* umbim
* Copyright (C) 2014 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <libubox/uloop.h>
#include "mbim.h"
size_t mbim_bufsize = 0;
uint8_t *mbim_buffer = NULL;
static struct uloop_fd mbim_fd;
static uint32_t expected;
int no_close;
static void mbim_msg_tout_cb(struct uloop_timeout *t)
{
fprintf(stderr, "ERROR: mbim message timeout\n");
mbim_end();
}
static struct uloop_timeout tout = {
.cb = mbim_msg_tout_cb,
};
int
mbim_send(void)
{
struct mbim_message_header *hdr = (struct mbim_message_header *) mbim_buffer;
int ret = 0;
if (le32toh(hdr->length) > mbim_bufsize) {
fprintf(stderr, "message too big %d\n", le32toh(hdr->length));
return -1;
}
if (verbose) {
fprintf(stderr, "sending (%d): ", le32toh(hdr->length));
for (ret = 0; ret < le32toh(hdr->length); ret++)
printf("%02x ", ((uint8_t *) mbim_buffer)[ret]);
printf("\n");
printf(" header_type: %04X\n", le32toh(hdr->type));
printf(" header_length: %04X\n", le32toh(hdr->length));
printf(" header_transaction: %04X\n", le32toh(hdr->transaction_id));
}
ret = write(mbim_fd.fd, mbim_buffer, le32toh(hdr->length));
if (!ret) {
perror("writing data failed: ");
} else {
expected = le32toh(hdr->type) | 0x80000000;
uloop_timeout_set(&tout, 15000);
}
return ret;
}
static void
mbim_recv(struct uloop_fd *u, unsigned int events)
{
ssize_t cnt = read(u->fd, mbim_buffer, mbim_bufsize);
struct mbim_message_header *hdr = (struct mbim_message_header *) mbim_buffer;
struct command_done_message *msg = (struct command_done_message *) (hdr + 1);
int i;
if (cnt < 0)
return;
if (cnt < sizeof(struct mbim_message_header)) {
perror("failed to read() data: ");
return;
}
if (verbose) {
printf("reading (%zu): ", cnt);
for (i = 0; i < cnt; i++)
printf("%02x ", mbim_buffer[i]);
printf("\n");
printf(" header_type: %04X\n", le32toh(hdr->type));
printf(" header_length: %04X\n", le32toh(hdr->length));
printf(" header_transaction: %04X\n", le32toh(hdr->transaction_id));
}
if (le32toh(hdr->type) == expected)
uloop_timeout_cancel(&tout);
switch(le32toh(hdr->type)) {
case MBIM_MESSAGE_TYPE_OPEN_DONE:
if (current_handler->request() < 0)
mbim_send_close_msg();
break;
case MBIM_MESSAGE_TYPE_COMMAND_DONE:
if (verbose) {
printf(" command_id: %04X\n", le32toh(msg->command_id));
printf(" status_code: %04X\n", le32toh(msg->status_code));
}
if (msg->status_code && !msg->buffer_length)
return_code = -le32toh(msg->status_code);
else
return_code = current_handler->response(msg->buffer, le32toh(msg->buffer_length));
if (return_code < 0)
no_close = 0;
mbim_send_close_msg();
break;
case MBIM_MESSAGE_TYPE_CLOSE_DONE:
mbim_end();
break;
case MBIM_MESSAGE_TYPE_FUNCTION_ERROR:
no_close = 0;
mbim_send_close_msg();
return_code = -1;
break;
}
}
void
mbim_open(const char *path)
{
mbim_fd.cb = mbim_recv;
mbim_fd.fd = open(path, O_RDWR);
if (mbim_fd.fd < 1) {
perror("open failed: ");
exit(-1);
}
mbim_bufsize = MBIM_BUFFER_SIZE;
mbim_buffer = malloc(mbim_bufsize);
uloop_fd_add(&mbim_fd, ULOOP_READ);
}
void
mbim_end(void)
{
if (mbim_buffer) {
free(mbim_buffer);
mbim_bufsize = 0;
mbim_buffer = NULL;
}
uloop_end();
}
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