1 /* 2 * 3 * BlueZ - Bluetooth protocol stack for Linux 4 * 5 * Copyright (C) 2004-2010 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 38 static uint16_t seqnum = 0x0000; 39 40 static int fd = -1; 41 42 int csr_open_h4(char *device) 43 { 44 struct termios ti; 45 46 if (!device) 47 device = "/dev/ttyS0"; 48 49 fd = open(device, O_RDWR | O_NOCTTY); 50 if (fd < 0) { 51 fprintf(stderr, "Can't open serial port: %s (%d)\n", 52 strerror(errno), errno); 53 return -1; 54 } 55 56 tcflush(fd, TCIOFLUSH); 57 58 if (tcgetattr(fd, &ti) < 0) { 59 fprintf(stderr, "Can't get port settings: %s (%d)\n", 60 strerror(errno), errno); 61 close(fd); 62 return -1; 63 } 64 65 cfmakeraw(&ti); 66 67 ti.c_cflag |= CLOCAL; 68 ti.c_cflag |= CRTSCTS; 69 70 cfsetospeed(&ti, B38400); 71 72 if (tcsetattr(fd, TCSANOW, &ti) < 0) { 73 fprintf(stderr, "Can't change port settings: %s (%d)\n", 74 strerror(errno), errno); 75 close(fd); 76 return -1; 77 } 78 79 tcflush(fd, TCIOFLUSH); 80 81 return 0; 82 } 83 84 static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length) 85 { 86 unsigned char cp[254], rp[254]; 87 uint8_t cmd[10]; 88 uint16_t size; 89 int len, offset = 3; 90 91 size = (length < 8) ? 9 : ((length + 1) / 2) + 5; 92 93 cmd[0] = command & 0xff; 94 cmd[1] = command >> 8; 95 cmd[2] = size & 0xff; 96 cmd[3] = size >> 8; 97 cmd[4] = seqnum & 0xff; 98 cmd[5] = seqnum >> 8; 99 cmd[6] = varid & 0xff; 100 cmd[7] = varid >> 8; 101 cmd[8] = 0x00; 102 cmd[9] = 0x00; 103 104 memset(cp, 0, sizeof(cp)); 105 cp[0] = 0x01; 106 cp[1] = 0x00; 107 cp[2] = 0xfc; 108 cp[3] = (size * 2) + 1; 109 cp[4] = 0xc2; 110 memcpy(cp + 5, cmd, sizeof(cmd)); 111 memcpy(cp + 15, value, length); 112 113 if (write(fd, cp, (size * 2) + 5) < 0) 114 return -1; 115 116 switch (varid) { 117 case CSR_VARID_COLD_RESET: 118 case CSR_VARID_WARM_RESET: 119 case CSR_VARID_COLD_HALT: 120 case CSR_VARID_WARM_HALT: 121 return 0; 122 } 123 124 do { 125 if (read(fd, rp, 1) < 1) 126 return -1; 127 } while (rp[0] != 0x04); 128 129 if (read(fd, rp + 1, 2) < 2) 130 return -1; 131 132 do { 133 len = read(fd, rp + offset, sizeof(rp) - offset); 134 offset += len; 135 } while (offset < rp[2] + 3); 136 137 if (rp[0] != 0x04 || rp[1] != 0xff || rp[3] != 0xc2) { 138 errno = EIO; 139 return -1; 140 } 141 142 if ((rp[12] + (rp[13] << 8)) != 0) { 143 errno = ENXIO; 144 return -1; 145 } 146 147 memcpy(value, rp + 14, length); 148 149 return 0; 150 } 151 152 int csr_read_h4(uint16_t varid, uint8_t *value, uint16_t length) 153 { 154 return do_command(0x0000, seqnum++, varid, value, length); 155 } 156 157 int csr_write_h4(uint16_t varid, uint8_t *value, uint16_t length) 158 { 159 return do_command(0x0002, seqnum++, varid, value, length); 160 } 161 162 void csr_close_h4(void) 163 { 164 close(fd); 165 } 166
