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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
*
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include <termios.h>
#include "csr.h"
static uint16_t seqnum = 0x0000;
static int fd = -1;
int csr_open_h4(char *device)
{
struct termios ti;
if (!device)
device = "/dev/ttyS0";
fd = open(device, O_RDWR | O_NOCTTY);
if (fd < 0) {
fprintf(stderr, "Can't open serial port: %s (%d)\n",
strerror(errno), errno);
return -1;
}
tcflush(fd, TCIOFLUSH);
if (tcgetattr(fd, &ti) < 0) {
fprintf(stderr, "Can't get port settings: %s (%d)\n",
strerror(errno), errno);
close(fd);
return -1;
}
cfmakeraw(&ti);
ti.c_cflag |= CLOCAL;
ti.c_cflag |= CRTSCTS;
cfsetospeed(&ti, B38400);
if (tcsetattr(fd, TCSANOW, &ti) < 0) {
fprintf(stderr, "Can't change port settings: %s (%d)\n",
strerror(errno), errno);
close(fd);
return -1;
}
tcflush(fd, TCIOFLUSH);
return 0;
}
static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
{
unsigned char cp[254], rp[254];
uint8_t cmd[10];
uint16_t size;
int len, offset = 3;
size = (length < 8) ? 9 : ((length + 1) / 2) + 5;
cmd[0] = command & 0xff;
cmd[1] = command >> 8;
cmd[2] = size & 0xff;
cmd[3] = size >> 8;
cmd[4] = seqnum & 0xff;
cmd[5] = seqnum >> 8;
cmd[6] = varid & 0xff;
cmd[7] = varid >> 8;
cmd[8] = 0x00;
cmd[9] = 0x00;
memset(cp, 0, sizeof(cp));
cp[0] = 0x01;
cp[1] = 0x00;
cp[2] = 0xfc;
cp[3] = (size * 2) + 1;
cp[4] = 0xc2;
memcpy(cp + 5, cmd, sizeof(cmd));
memcpy(cp + 15, value, length);
if (write(fd, cp, (size * 2) + 5) < 0)
return -1;
switch (varid) {
case CSR_VARID_COLD_RESET:
case CSR_VARID_WARM_RESET:
case CSR_VARID_COLD_HALT:
case CSR_VARID_WARM_HALT:
return 0;
}
do {
if (read(fd, rp, 1) < 1)
return -1;
} while (rp[0] != 0x04);
if (read(fd, rp + 1, 2) < 2)
return -1;
do {
len = read(fd, rp + offset, sizeof(rp) - offset);
offset += len;
} while (offset < rp[2] + 3);
if (rp[0] != 0x04 || rp[1] != 0xff || rp[3] != 0xc2) {
errno = EIO;
return -1;
}
if ((rp[12] + (rp[13] << 8)) != 0) {
errno = ENXIO;
return -1;
}
memcpy(value, rp + 14, length);
return 0;
}
int csr_read_h4(uint16_t varid, uint8_t *value, uint16_t length)
{
return do_command(0x0000, seqnum++, varid, value, length);
}
int csr_write_h4(uint16_t varid, uint8_t *value, uint16_t length)
{
return do_command(0x0002, seqnum++, varid, value, length);
}
void csr_close_h4(void)
{
close(fd);
}
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