1 /*- 2 * Copyright (C) 2004 Joerg Wunsch 3 * All Rights Reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Send or receive messages over an SMBus. 31 */ 32 33 #include <err.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <sysexits.h> 40 #include <unistd.h> 41 42 #include <sys/types.h> 43 #include <sys/ioctl.h> 44 45 #include <dev/smbus/smb.h> 46 47 #include "pathnames.h" 48 49 static const char *dev = PATH_DEFAULTSMBDEV; 50 static const char *bytefmt = "0x%02x"; 51 static const char *wordfmt = "0x%04x"; 52 static const char *fmt; 53 54 static int fd; /* file descriptor for /dev/smbX */ 55 static int cflag = -1; /* SMBus cmd */ 56 static int iflag = -1; /* input data */ 57 static int oflag = -1; /* output data */ 58 static int pflag; /* probe bus */ 59 static int slave = -1; /* slave address */ 60 static int wflag; /* word IO */ 61 62 static unsigned char ibuf[SMB_MAXBLOCKSIZE]; 63 static unsigned char obuf[SMB_MAXBLOCKSIZE]; 64 static unsigned short oword, iword; 65 66 /* 67 * The I2C specs say that all addresses below 16 and above or equal 68 * 240 are reserved. Address 0 is the global address, but we do not 69 * care for this detail. 70 */ 71 #define MIN_I2C_ADDR 16 72 #define MAX_I2C_ADDR 240 73 74 static void 75 usage(void) 76 { 77 fprintf(stderr, 78 "usage: smbmsg [-f dev] -p\n" 79 " smbmsg [-f dev] -s slave [-F fmt] [-c cmd] [-w] " 80 "[-i incnt] [-o outcnt] [outdata ...]\n"); 81 exit (EX_USAGE); 82 } 83 84 static int 85 getnum(const char *s) 86 { 87 char *endp; 88 unsigned long l; 89 90 l = strtoul(s, &endp, 0); 91 if (*s != '\0' && *endp == '\0') 92 return (int)l; 93 return -1; 94 } 95 96 static void 97 probe_i2c(void) 98 { 99 unsigned char addr; 100 int flags; 101 #define IS_READABLE 1 102 #define IS_WRITEABLE 2 103 struct smbcmd c; 104 105 printf("Probing for devices on %s:\n", dev); 106 107 for (addr = MIN_I2C_ADDR; addr < MAX_I2C_ADDR; addr += 2) { 108 c.slave = addr; 109 flags = 0; 110 if (ioctl(fd, SMB_RECVB, &c) != -1) 111 flags = IS_READABLE; 112 if (ioctl(fd, SMB_QUICK_WRITE, &c) != -1) 113 flags |= IS_WRITEABLE; 114 if (flags != 0) { 115 printf("Device @0x%02x: ", addr); 116 if (flags & IS_READABLE) 117 putchar('r'); 118 if (flags & IS_WRITEABLE) 119 putchar('w'); 120 putchar('\n'); 121 } 122 } 123 } 124 125 static int 126 do_io(void) 127 { 128 struct smbcmd c; 129 int i; 130 131 c.slave = slave; 132 c.cmd = cflag; 133 134 if (fmt == NULL && iflag > 0) 135 fmt = wflag? wordfmt: bytefmt; 136 137 if (cflag == -1) { 138 /* operations that do not require a command byte */ 139 if (iflag == -1 && oflag == 0) 140 /* 0 bytes output: quick write operation */ 141 return (ioctl(fd, SMB_QUICK_WRITE, &c)); 142 else if (iflag == 0 && oflag == -1) 143 /* 0 bytes input: quick read operation */ 144 return (ioctl(fd, SMB_QUICK_READ, &c)); 145 else if (iflag == 1 && oflag == -1) { 146 /* no command, 1 byte input: receive byte op. */ 147 if (ioctl(fd, SMB_RECVB, &c) == -1) 148 return (-1); 149 printf(fmt, (unsigned char)c.cmd); 150 putchar('\n'); 151 return (0); 152 } else if (iflag == -1 && oflag == 1) { 153 /* no command, 1 byte output: send byte op. */ 154 c.cmd = obuf[0]; 155 return (ioctl(fd, SMB_SENDB, &c)); 156 } else 157 return (-2); 158 } 159 if (iflag == 1 && oflag == -1) { 160 /* command + 1 byte input: read byte op. */ 161 c.data.byte_ptr = ibuf; 162 if (ioctl(fd, SMB_READB, &c) == -1) 163 return (-1); 164 printf(fmt, (int)(unsigned char)ibuf[0]); 165 putchar('\n'); 166 return (0); 167 } else if (iflag == -1 && oflag == 1) { 168 /* command + 1 byte output: write byte op. */ 169 c.data.byte = obuf[0]; 170 return (ioctl(fd, SMB_WRITEB, &c)); 171 } else if (wflag && iflag == 2 && oflag == -1) { 172 /* command + 2 bytes input: read word op. */ 173 c.data.word_ptr = &iword; 174 if (ioctl(fd, SMB_READW, &c) == -1) 175 return (-1); 176 printf(fmt, (int)(unsigned short)iword); 177 putchar('\n'); 178 return (0); 179 } else if (wflag && iflag == -1 && oflag == 2) { 180 /* command + 2 bytes output: write word op. */ 181 c.data.word = oword; 182 return (ioctl(fd, SMB_WRITEW, &c)); 183 } else if (wflag && iflag == 2 && oflag == 2) { 184 /* 185 * command + 2 bytes output + 2 bytes input: 186 * "process call" op. 187 */ 188 c.data.process.sdata = oword; 189 c.data.process.rdata = &iword; 190 if (ioctl(fd, SMB_PCALL, &c) == -1) 191 return (-1); 192 printf(fmt, (int)(unsigned short)iword); 193 putchar('\n'); 194 return (0); 195 } else if (iflag > 1 && oflag == -1) { 196 /* command + > 1 bytes of input: block read */ 197 c.data.byte_ptr = ibuf; 198 c.count = iflag; 199 if (ioctl(fd, SMB_BREAD, &c) == -1) 200 return (-1); 201 for (i = 0; i < iflag; i++) { 202 if (i != 0) 203 putchar(' '); 204 printf(fmt, ibuf[i]); 205 } 206 putchar('\n'); 207 return (0); 208 } else if (iflag == -1 && oflag > 1) { 209 /* command + > 1 bytes of output: block write */ 210 c.data.byte_ptr = obuf; 211 c.count = oflag; 212 return (ioctl(fd, SMB_BWRITE, &c)); 213 } 214 215 return (-2); 216 } 217 218 219 int 220 main(int argc, char **argv) 221 { 222 int i, n, errs = 0; 223 int savederrno; 224 225 while ((i = getopt(argc, argv, "F:c:f:i:o:ps:w")) != -1) 226 switch (i) { 227 case 'F': 228 fmt = optarg; 229 break; 230 231 case 'c': 232 if ((cflag = getnum(optarg)) == -1) 233 errx(EX_USAGE, "Invalid number: %s", optarg); 234 if (cflag < 0 || cflag >= 256) 235 errx(EX_USAGE, 236 "CMD out of range: %d", 237 cflag); 238 break; 239 240 case 'f': 241 dev = optarg; 242 break; 243 244 case 'i': 245 if ((iflag = getnum(optarg)) == -1) 246 errx(EX_USAGE, "Invalid number: %s", optarg); 247 if (iflag < 0 || iflag >= SMB_MAXBLOCKSIZE) 248 errx(EX_USAGE, 249 "# input bytes out of range: %d", 250 iflag); 251 break; 252 253 case 'o': 254 if ((oflag = getnum(optarg)) == -1) 255 errx(EX_USAGE, "Invalid number: %s", optarg); 256 if (oflag < 0 || oflag >= SMB_MAXBLOCKSIZE) 257 errx(EX_USAGE, 258 "# output bytes out of range: %d", 259 oflag); 260 break; 261 262 case 'p': 263 pflag = 1; 264 break; 265 266 case 's': 267 if ((slave = getnum(optarg)) == -1) 268 errx(EX_USAGE, "Invalid number: %s", optarg); 269 270 if (slave < MIN_I2C_ADDR || slave >= MAX_I2C_ADDR) 271 errx(EX_USAGE, 272 "Slave address out of range: %d", 273 slave); 274 break; 275 276 case 'w': 277 wflag = 1; 278 break; 279 280 default: 281 errs++; 282 } 283 argc -= optind; 284 argv += optind; 285 if (errs || (slave != -1 && pflag) || (slave == -1 && !pflag)) 286 usage(); 287 if (wflag && 288 !((iflag == 2 && oflag == -1) || 289 (iflag == -1 && oflag == 2) || 290 (iflag == 2 && oflag == 2))) 291 errx(EX_USAGE, "Illegal # IO bytes for word IO"); 292 if (!pflag && iflag == -1 && oflag == -1) 293 errx(EX_USAGE, "Nothing to do"); 294 if (pflag && (cflag != -1 || iflag != -1 || oflag != -1 || wflag != 0)) 295 usage(); 296 if (oflag > 0) { 297 if (oflag == 2 && wflag) { 298 if (argc == 0) 299 errx(EX_USAGE, "Too few arguments for -o count"); 300 if ((n = getnum(*argv)) == -1) 301 errx(EX_USAGE, "Invalid number: %s", *argv); 302 if (n < 0 || n >= 65535) 303 errx(EX_USAGE, "Value out of range: %d", n); 304 oword = n; 305 argc--; 306 argv++; 307 } else for (i = 0; i < oflag; i++, argv++, argc--) { 308 if (argc == 0) 309 errx(EX_USAGE, "Too few arguments for -o count"); 310 if ((n = getnum(*argv)) == -1) 311 errx(EX_USAGE, "Invalid number: %s", *argv); 312 if (n < 0 || n >= 256) 313 errx(EX_USAGE, "Value out of range: %d", n); 314 obuf[i] = n; 315 } 316 } 317 if (argc != 0) 318 usage(); 319 320 if ((fd = open(dev, O_RDWR)) == -1) 321 err(EX_UNAVAILABLE, "Cannot open %s", dev); 322 323 i = 0; 324 if (pflag) 325 probe_i2c(); 326 else 327 i = do_io(); 328 329 savederrno = errno; 330 close(fd); 331 errno = savederrno; 332 333 if (i == -1) 334 err(EX_UNAVAILABLE, "Error performing SMBus IO"); 335 else if (i == -2) 336 errx(EX_USAGE, "Invalid option combination"); 337 338 return 0; 339 } 340