1 /* 2 * 3 * BlueZ - Bluetooth protocol stack for Linux 4 * 5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel (at) holtmann.org> 6 * 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 21 * 22 */ 23 24 #ifdef HAVE_CONFIG_H 25 #include <config.h> 26 #endif 27 28 #include <stdio.h> 29 #include <errno.h> 30 #include <fcntl.h> 31 #include <unistd.h> 32 #include <string.h> 33 #include <stdint.h> 34 #include <termios.h> 35 36 #include "csr.h" 37 #include "ubcsp.h" 38 39 static uint16_t seqnum = 0x0000; 40 41 static int fd = -1; 42 43 static struct ubcsp_packet send_packet; 44 static uint8_t send_buffer[512]; 45 46 static struct ubcsp_packet receive_packet; 47 static uint8_t receive_buffer[512]; 48 49 int csr_open_bcsp(char *device) 50 { 51 struct termios ti; 52 uint8_t delay, activity = 0x00; 53 int timeout = 0; 54 55 if (!device) 56 device = "/dev/ttyS0"; 57 58 fd = open(device, O_RDWR | O_NOCTTY); 59 if (fd < 0) { 60 fprintf(stderr, "Can't open serial port: %s (%d)\n", 61 strerror(errno), errno); 62 return -1; 63 } 64 65 tcflush(fd, TCIOFLUSH); 66 67 if (tcgetattr(fd, &ti) < 0) { 68 fprintf(stderr, "Can't get port settings: %s (%d)\n", 69 strerror(errno), errno); 70 close(fd); 71 return -1; 72 } 73 74 cfmakeraw(&ti); 75 76 ti.c_cflag |= CLOCAL; 77 ti.c_cflag &= ~CRTSCTS; 78 ti.c_cflag |= PARENB; 79 ti.c_cflag &= ~PARODD; 80 ti.c_cflag &= ~CSIZE; 81 ti.c_cflag |= CS8; 82 ti.c_cflag &= ~CSTOPB; 83 84 ti.c_cc[VMIN] = 1; 85 ti.c_cc[VTIME] = 0; 86 87 cfsetospeed(&ti, B38400); 88 89 if (tcsetattr(fd, TCSANOW, &ti) < 0) { 90 fprintf(stderr, "Can't change port settings: %s (%d)\n", 91 strerror(errno), errno); 92 close(fd); 93 return -1; 94 } 95 96 tcflush(fd, TCIOFLUSH); 97 98 if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK) < 0) { 99 fprintf(stderr, "Can't set non blocking mode: %s (%d)\n", 100 strerror(errno), errno); 101 close(fd); 102 return -1; 103 } 104 105 memset(&send_packet, 0, sizeof(send_packet)); 106 memset(&receive_packet, 0, sizeof(receive_packet)); 107 108 ubcsp_initialize(); 109 110 send_packet.length = 512; 111 send_packet.payload = send_buffer; 112 113 receive_packet.length = 512; 114 receive_packet.payload = receive_buffer; 115 116 ubcsp_receive_packet(&receive_packet); 117 118 while (1) { 119 delay = ubcsp_poll(&activity); 120 121 if (activity & UBCSP_PACKET_RECEIVED) 122 break; 123 124 if (delay) { 125 usleep(delay * 100); 126 127 if (timeout++ > 5000) { 128 fprintf(stderr, "Initialization timed out\n"); 129 return -1; 130 } 131 } 132 } 133 134 return 0; 135 } 136 137 void put_uart(uint8_t ch) 138 { 139 if (write(fd, &ch, 1) < 0) 140 fprintf(stderr, "UART write error\n"); 141 } 142 143 uint8_t get_uart(uint8_t *ch) 144 { 145 int res = read(fd, ch, 1); 146 return res > 0 ? res : 0; 147 } 148 149 static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length) 150 { 151 unsigned char cp[254], rp[254]; 152 uint8_t cmd[10]; 153 uint16_t size; 154 uint8_t delay, activity = 0x00; 155 int timeout = 0, sent = 0; 156 157 size = (length < 8) ? 9 : ((length + 1) / 2) + 5; 158 159 cmd[0] = command & 0xff; 160 cmd[1] = command >> 8; 161 cmd[2] = size & 0xff; 162 cmd[3] = size >> 8; 163 cmd[4] = seqnum & 0xff; 164 cmd[5] = seqnum >> 8; 165 cmd[6] = varid & 0xff; 166 cmd[7] = varid >> 8; 167 cmd[8] = 0x00; 168 cmd[9] = 0x00; 169 170 memset(cp, 0, sizeof(cp)); 171 cp[0] = 0x00; 172 cp[1] = 0xfc; 173 cp[2] = (size * 2) + 1; 174 cp[3] = 0xc2; 175 memcpy(cp + 4, cmd, sizeof(cmd)); 176 memcpy(cp + 14, value, length); 177 178 receive_packet.length = 512; 179 ubcsp_receive_packet(&receive_packet); 180 181 send_packet.channel = 5; 182 send_packet.reliable = 1; 183 send_packet.length = (size * 2) + 4; 184 memcpy(send_packet.payload, cp, (size * 2) + 4); 185 186 ubcsp_send_packet(&send_packet); 187 188 while (1) { 189 delay = ubcsp_poll(&activity); 190 191 if (activity & UBCSP_PACKET_SENT) { 192 switch (varid) { 193 case CSR_VARID_COLD_RESET: 194 case CSR_VARID_WARM_RESET: 195 case CSR_VARID_COLD_HALT: 196 case CSR_VARID_WARM_HALT: 197 return 0; 198 } 199 200 sent = 1; 201 timeout = 0; 202 } 203 204 if (activity & UBCSP_PACKET_RECEIVED) { 205 if (sent && receive_packet.channel == 5 && 206 receive_packet.payload[0] == 0xff) { 207 memcpy(rp, receive_packet.payload, 208 receive_packet.length); 209 break; 210 } 211 212 receive_packet.length = 512; 213 ubcsp_receive_packet(&receive_packet); 214 timeout = 0; 215 } 216 217 if (delay) { 218 usleep(delay * 100); 219 220 if (timeout++ > 5000) { 221 fprintf(stderr, "Operation timed out\n"); 222 return -1; 223 } 224 } 225 } 226 227 if (rp[0] != 0xff || rp[2] != 0xc2) { 228 errno = EIO; 229 return -1; 230 } 231 232 if ((rp[11] + (rp[12] << 8)) != 0) { 233 errno = ENXIO; 234 return -1; 235 } 236 237 memcpy(value, rp + 13, length); 238 239 return 0; 240 } 241 242 int csr_read_bcsp(uint16_t varid, uint8_t *value, uint16_t length) 243 { 244 return do_command(0x0000, seqnum++, varid, value, length); 245 } 246 247 int csr_write_bcsp(uint16_t varid, uint8_t *value, uint16_t length) 248 { 249 return do_command(0x0002, seqnum++, varid, value, length); 250 } 251 252 void csr_close_bcsp(void) 253 { 254 close(fd); 255 } 256
