166 lines
3.3 KiB
C
166 lines
3.3 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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#include <termios.h>
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#include "csr.h"
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static uint16_t seqnum = 0x0000;
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static int fd = -1;
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int csr_open_h4(char *device)
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{
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struct termios ti;
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if (!device)
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device = "/dev/ttyS0";
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fd = open(device, O_RDWR | O_NOCTTY);
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if (fd < 0) {
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fprintf(stderr, "Can't open serial port: %s (%d)\n",
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strerror(errno), errno);
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return -1;
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}
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tcflush(fd, TCIOFLUSH);
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if (tcgetattr(fd, &ti) < 0) {
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fprintf(stderr, "Can't get port settings: %s (%d)\n",
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strerror(errno), errno);
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close(fd);
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return -1;
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}
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cfmakeraw(&ti);
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ti.c_cflag |= CLOCAL;
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ti.c_cflag |= CRTSCTS;
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cfsetospeed(&ti, B38400);
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if (tcsetattr(fd, TCSANOW, &ti) < 0) {
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fprintf(stderr, "Can't change port settings: %s (%d)\n",
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strerror(errno), errno);
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close(fd);
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return -1;
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}
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tcflush(fd, TCIOFLUSH);
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return 0;
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}
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static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
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{
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unsigned char cp[254], rp[254];
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uint8_t cmd[10];
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uint16_t size;
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int len, offset = 3;
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size = (length < 8) ? 9 : ((length + 1) / 2) + 5;
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cmd[0] = command & 0xff;
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cmd[1] = command >> 8;
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cmd[2] = size & 0xff;
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cmd[3] = size >> 8;
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cmd[4] = seqnum & 0xff;
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cmd[5] = seqnum >> 8;
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cmd[6] = varid & 0xff;
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cmd[7] = varid >> 8;
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cmd[8] = 0x00;
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cmd[9] = 0x00;
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memset(cp, 0, sizeof(cp));
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cp[0] = 0x01;
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cp[1] = 0x00;
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cp[2] = 0xfc;
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cp[3] = (size * 2) + 1;
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cp[4] = 0xc2;
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memcpy(cp + 5, cmd, sizeof(cmd));
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memcpy(cp + 15, value, length);
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if (write(fd, cp, (size * 2) + 5) < 0)
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return -1;
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switch (varid) {
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case CSR_VARID_COLD_RESET:
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case CSR_VARID_WARM_RESET:
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case CSR_VARID_COLD_HALT:
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case CSR_VARID_WARM_HALT:
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return 0;
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}
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do {
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if (read(fd, rp, 1) < 1)
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return -1;
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} while (rp[0] != 0x04);
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if (read(fd, rp + 1, 2) < 2)
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return -1;
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do {
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len = read(fd, rp + offset, sizeof(rp) - offset);
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offset += len;
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} while (offset < rp[2] + 3);
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if (rp[0] != 0x04 || rp[1] != 0xff || rp[3] != 0xc2) {
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errno = EIO;
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return -1;
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}
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if ((rp[12] + (rp[13] << 8)) != 0) {
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errno = ENXIO;
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return -1;
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}
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memcpy(value, rp + 14, length);
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return 0;
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}
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int csr_read_h4(uint16_t varid, uint8_t *value, uint16_t length)
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{
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return do_command(0x0000, seqnum++, varid, value, length);
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}
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int csr_write_h4(uint16_t varid, uint8_t *value, uint16_t length)
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{
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return do_command(0x0002, seqnum++, varid, value, length);
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}
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void csr_close_h4(void)
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{
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close(fd);
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}
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