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 int do_io(void); 75 static int getnum(const char *s); 76 static void probe_i2c(void); 77 static void usage(void); 78 79 static void 80 usage(void) 81 { 82 fprintf(stderr, 83 "usage: smbmsg [-f dev] -p\n" 84 " smbmsg [-f dev] -s slave [-F fmt] [-c cmd] [-w] " 85 "[-i incnt] [-o outcnt] [outdata ...]\n"); 86 exit(EX_USAGE); 87 } 88 89 static int 90 getnum(const char *s) 91 { 92 char *endp; 93 unsigned long l; 94 95 l = strtoul(s, &endp, 0); 96 if (*s != '\0' && *endp == '\0') 97 return (int)l; 98 return (-1); 99 } 100 101 static void 102 probe_i2c(void) 103 { 104 unsigned char addr; 105 int flags; 106 #define IS_READABLE 1 107 #define IS_WRITEABLE 2 108 struct smbcmd c; 109 110 printf("Probing for devices on %s:\n", dev); 111 112 for (addr = MIN_I2C_ADDR; addr < MAX_I2C_ADDR; addr += 2) { 113 c.slave = addr; 114 flags = 0; 115 if (ioctl(fd, SMB_RECVB, &c) != -1) 116 flags = IS_READABLE; 117 if (ioctl(fd, SMB_QUICK_WRITE, &c) != -1) 118 flags |= IS_WRITEABLE; 119 if (flags != 0) { 120 printf("Device @0x%02x: ", addr); 121 if (flags & IS_READABLE) 122 putchar('r'); 123 if (flags & IS_WRITEABLE) 124 putchar('w'); 125 putchar('\n'); 126 } 127 } 128 } 129 130 static int 131 do_io(void) 132 { 133 struct smbcmd c; 134 int i; 135 136 c.slave = slave; 137 c.cmd = cflag; 138 139 if (fmt == NULL && iflag > 0) 140 fmt = wflag? wordfmt: bytefmt; 141 142 if (cflag == -1) { 143 /* operations that do not require a command byte */ 144 if (iflag == -1 && oflag == 0) 145 /* 0 bytes output: quick write operation */ 146 return (ioctl(fd, SMB_QUICK_WRITE, &c)); 147 else if (iflag == 0 && oflag == -1) 148 /* 0 bytes input: quick read operation */ 149 return (ioctl(fd, SMB_QUICK_READ, &c)); 150 else if (iflag == 1 && oflag == -1) { 151 /* no command, 1 byte input: receive byte op. */ 152 if (ioctl(fd, SMB_RECVB, &c) == -1) 153 return (-1); 154 printf(fmt, (unsigned char)c.cmd); 155 putchar('\n'); 156 return (0); 157 } else if (iflag == -1 && oflag == 1) { 158 /* no command, 1 byte output: send byte op. */ 159 c.cmd = obuf[0]; 160 return (ioctl(fd, SMB_SENDB, &c)); 161 } else 162 return (-2); 163 } 164 if (iflag == 1 && oflag == -1) { 165 /* command + 1 byte input: read byte op. */ 166 c.data.byte_ptr = ibuf; 167 if (ioctl(fd, SMB_READB, &c) == -1) 168 return (-1); 169 printf(fmt, (int)(unsigned char)ibuf[0]); 170 putchar('\n'); 171 return (0); 172 } else if (iflag == -1 && oflag == 1) { 173 /* command + 1 byte output: write byte op. */ 174 c.data.byte = obuf[0]; 175 return (ioctl(fd, SMB_WRITEB, &c)); 176 } else if (wflag && iflag == 2 && oflag == -1) { 177 /* command + 2 bytes input: read word op. */ 178 c.data.word_ptr = &iword; 179 if (ioctl(fd, SMB_READW, &c) == -1) 180 return (-1); 181 printf(fmt, (int)(unsigned short)iword); 182 putchar('\n'); 183 return (0); 184 } else if (wflag && iflag == -1 && oflag == 2) { 185 /* command + 2 bytes output: write word op. */ 186 c.data.word = oword; 187 return (ioctl(fd, SMB_WRITEW, &c)); 188 } else if (wflag && iflag == 2 && oflag == 2) { 189 /* 190 * command + 2 bytes output + 2 bytes input: 191 * "process call" op. 192 */ 193 c.data.process.sdata = oword; 194 c.data.process.rdata = &iword; 195 if (ioctl(fd, SMB_PCALL, &c) == -1) 196 return (-1); 197 printf(fmt, (int)(unsigned short)iword); 198 putchar('\n'); 199 return (0); 200 } else if (iflag > 1 && oflag == -1) { 201 /* command + > 1 bytes of input: block read */ 202 c.data.byte_ptr = ibuf; 203 c.count = iflag; 204 if (ioctl(fd, SMB_BREAD, &c) == -1) 205 return (-1); 206 for (i = 0; i < iflag; i++) { 207 if (i != 0) 208 putchar(' '); 209 printf(fmt, ibuf[i]); 210 } 211 putchar('\n'); 212 return (0); 213 } else if (iflag == -1 && oflag > 1) { 214 /* command + > 1 bytes of output: block write */ 215 c.data.byte_ptr = obuf; 216 c.count = oflag; 217 return (ioctl(fd, SMB_BWRITE, &c)); 218 } 219 220 return (-2); 221 } 222 223 224 int 225 main(int argc, char **argv) 226 { 227 int i, n, errs = 0; 228 int savederrno; 229 230 while ((i = getopt(argc, argv, "F:c:f:i:o:ps:w")) != -1) 231 switch (i) { 232 case 'F': 233 fmt = optarg; 234 break; 235 236 case 'c': 237 if ((cflag = getnum(optarg)) == -1) 238 errx(EX_USAGE, "Invalid number: %s", optarg); 239 if (cflag < 0 || cflag >= 256) 240 errx(EX_USAGE, 241 "CMD out of range: %d", 242 cflag); 243 break; 244 245 case 'f': 246 dev = optarg; 247 break; 248 249 case 'i': 250 if ((iflag = getnum(optarg)) == -1) 251 errx(EX_USAGE, "Invalid number: %s", optarg); 252 if (iflag < 0 || iflag > SMB_MAXBLOCKSIZE) 253 errx(EX_USAGE, 254 "# input bytes out of range: %d", 255 iflag); 256 break; 257 258 case 'o': 259 if ((oflag = getnum(optarg)) == -1) 260 errx(EX_USAGE, "Invalid number: %s", optarg); 261 if (oflag < 0 || oflag > SMB_MAXBLOCKSIZE) 262 errx(EX_USAGE, 263 "# output bytes out of range: %d", 264 oflag); 265 break; 266 267 case 'p': 268 pflag = 1; 269 break; 270 271 case 's': 272 if ((slave = getnum(optarg)) == -1) 273 errx(EX_USAGE, "Invalid number: %s", optarg); 274 275 if (slave < MIN_I2C_ADDR || slave >= MAX_I2C_ADDR) 276 errx(EX_USAGE, 277 "Slave address out of range: %d", 278 slave); 279 break; 280 281 case 'w': 282 wflag = 1; 283 break; 284 285 default: 286 errs++; 287 } 288 argc -= optind; 289 argv += optind; 290 if (errs || (slave != -1 && pflag) || (slave == -1 && !pflag)) 291 usage(); 292 if (wflag && 293 !((iflag == 2 && oflag == -1) || 294 (iflag == -1 && oflag == 2) || 295 (iflag == 2 && oflag == 2))) 296 errx(EX_USAGE, "Illegal # IO bytes for word IO"); 297 if (!pflag && iflag == -1 && oflag == -1) 298 errx(EX_USAGE, "Nothing to do"); 299 if (pflag && (cflag != -1 || iflag != -1 || oflag != -1 || wflag != 0)) 300 usage(); 301 if (oflag > 0) { 302 if (oflag == 2 && wflag) { 303 if (argc == 0) 304 errx(EX_USAGE, "Too few arguments for -o count"); 305 if ((n = getnum(*argv)) == -1) 306 errx(EX_USAGE, "Invalid number: %s", *argv); 307 if (n < 0 || n >= 65535) 308 errx(EX_USAGE, "Value out of range: %d", n); 309 oword = n; 310 argc--; 311 argv++; 312 } else for (i = 0; i < oflag; i++, argv++, argc--) { 313 if (argc == 0) 314 errx(EX_USAGE, "Too few arguments for -o count"); 315 if ((n = getnum(*argv)) == -1) 316 errx(EX_USAGE, "Invalid number: %s", *argv); 317 if (n < 0 || n >= 256) 318 errx(EX_USAGE, "Value out of range: %d", n); 319 obuf[i] = n; 320 } 321 } 322 if (argc != 0) 323 usage(); 324 325 if ((fd = open(dev, O_RDWR)) == -1) 326 err(EX_UNAVAILABLE, "Cannot open %s", dev); 327 328 i = 0; 329 if (pflag) 330 probe_i2c(); 331 else 332 i = do_io(); 333 334 savederrno = errno; 335 close(fd); 336 errno = savederrno; 337 338 if (i == -1) 339 err(EX_UNAVAILABLE, "Error performing SMBus IO"); 340 else if (i == -2) 341 errx(EX_USAGE, "Invalid option combination"); 342 343 return (0); 344 } 345