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/* Copyright (c) 2011 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.
*/
/* ec_uartd.c - UART daemon for BD-ICDI-B board for EC debugging
*
* based on chromeos_public/src/third_party/hdctools/src/ftdiuart.c
*
* compile with:
* gcc -o ftdi_uartd ftdi_uartd.c -lftdi
*/
/* Force header files to define grantpt(), posix_openpt(), cfmakeraw() */
#define _BSD_SOURCE
#define _XOPEN_SOURCE 600
/* Force header file to declare ptsname_r(), etc. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <fcntl.h>
#pragma GCC diagnostic ignored "-Wstrict-prototypes"
#include <ftdi.h>
#pragma GCC diagnostic pop
#include <getopt.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
static const int ftdi_id[][2] = { {0x0403, 0xbcda},
{0x0403, 0xbcd9} };
int main(int argc, char **argv)
{
struct ftdi_context fcontext;
struct termios tty_cfg;
char ptname[PATH_MAX];
char buf[1024];
int fd;
int rv;
int i;
int device_opened;
/* Init */
if (ftdi_init(&fcontext) < 0) {
fprintf(stderr, "ftdi_init failed\n");
return 1;
}
/* Open interface B (UART) in the FTDI device and set 115kbaud */
ftdi_set_interface(&fcontext, INTERFACE_B);
device_opened = 0;
for (i = 0; i < sizeof(ftdi_id) / sizeof(ftdi_id[0]); ++i) {
rv = ftdi_usb_open(&fcontext, ftdi_id[i][0], ftdi_id[i][1]);
if (rv >= 0) {
fprintf(stderr, "Using FTDI device %04x:%04x\n",
ftdi_id[i][0], ftdi_id[i][1]);
device_opened = 1;
break;
}
}
if (!device_opened) {
fprintf(stderr, "error opening ftdi device: %d (%s)\n",
rv, ftdi_get_error_string(&fcontext));
return 2;
}
rv = ftdi_set_baudrate(&fcontext, 115200);
if (rv < 0) {
fprintf(stderr, "error setting baudrate: %d (%s)\n",
rv, ftdi_get_error_string(&fcontext));
return 2;
}
/* Set DTR; this muxes RX on the ICDI board */
ftdi_setdtr(&fcontext, 1);
/* Open the pty */
fd = posix_openpt(O_RDWR | O_NOCTTY);
if (fd == -1) {
perror("opening pty master");
return 3;
}
if (grantpt(fd) == -1) {
perror("grantpt");
return 3;
}
if (unlockpt(fd) == -1) {
perror("unlockpt");
return 3;
}
if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) {
perror("fcntl setfl -> nonblock");
return 3;
}
if (ptsname_r(fd, ptname, PATH_MAX) != 0) {
perror("getting name of pty");
return 3;
}
fprintf(stderr, "pty name = %s\n", ptname);
if (!isatty(fd)) {
perror("not a TTY device\n");
return 3;
}
cfmakeraw(&tty_cfg);
tcsetattr(fd, TCSANOW, &tty_cfg);
if (chmod(ptname, 0666) == -1) {
perror("setting pty attributes");
return 3;
}
/* Read and write data forever */
while (1) {
int bytes = read(fd, buf, sizeof(buf));
if (bytes > 0) {
rv = ftdi_write_data(&fcontext, buf, bytes);
if (rv != bytes) {
perror("writing to uart");
break;
}
}
usleep(1000);
bytes = ftdi_read_data(&fcontext, buf, sizeof(buf));
if (bytes > 0) {
int bytes_remaining = bytes;
while ((bytes = write(fd, buf, bytes_remaining)) > 0)
bytes_remaining -= bytes;
if (bytes == -1)
perror("writing ftdi data to pty");
} else if (bytes < 0) {
perror("failed ftdi_read_data");
break;
}
}
/* Cleanup */
close(fd);
ftdi_usb_close(&fcontext);
ftdi_deinit(&fcontext);
return 0;
}
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