1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 2004 Joerg Wunsch 5 * All Rights Reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 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; 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 c.rcount = 0; 139 c.wcount = 0; 140 141 if (fmt == NULL && iflag > 0) 142 fmt = wflag? wordfmt: bytefmt; 143 144 if (cflag == -1) { 145 /* operations that do not require a command byte */ 146 if (iflag == -1 && oflag == 0) 147 /* 0 bytes output: quick write operation */ 148 return (ioctl(fd, SMB_QUICK_WRITE, &c)); 149 else if (iflag == 0 && oflag == -1) 150 /* 0 bytes input: quick read operation */ 151 return (ioctl(fd, SMB_QUICK_READ, &c)); 152 else if (iflag == 1 && oflag == -1) { 153 /* no command, 1 byte input: receive byte op. */ 154 if (ioctl(fd, SMB_RECVB, &c) == -1) 155 return (-1); 156 printf(fmt, (unsigned char)c.cmd); 157 putchar('\n'); 158 return (0); 159 } else if (iflag == -1 && oflag == 1) { 160 /* no command, 1 byte output: send byte op. */ 161 c.cmd = obuf[0]; 162 return (ioctl(fd, SMB_SENDB, &c)); 163 } else 164 return (-2); 165 } 166 if (iflag == 1 && oflag == -1) { 167 /* command + 1 byte input: read byte op. */ 168 if (ioctl(fd, SMB_READB, &c) == -1) 169 return (-1); 170 printf(fmt, (unsigned char)c.rdata.byte); 171 putchar('\n'); 172 return (0); 173 } else if (iflag == -1 && oflag == 1) { 174 /* command + 1 byte output: write byte op. */ 175 c.wdata.byte = obuf[0]; 176 return (ioctl(fd, SMB_WRITEB, &c)); 177 } else if (wflag && iflag == 2 && oflag == -1) { 178 /* command + 2 bytes input: read word op. */ 179 if (ioctl(fd, SMB_READW, &c) == -1) 180 return (-1); 181 printf(fmt, (unsigned short)c.rdata.word); 182 putchar('\n'); 183 return (0); 184 } else if (wflag && iflag == -1 && oflag == 2) { 185 /* command + 2 bytes output: write word op. */ 186 c.wdata.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.wdata.word = oword; 194 if (ioctl(fd, SMB_PCALL, &c) == -1) 195 return (-1); 196 printf(fmt, (unsigned short)c.rdata.word); 197 putchar('\n'); 198 return (0); 199 } else if (iflag > 1 && oflag == -1) { 200 /* command + > 1 bytes of input: block read */ 201 c.rbuf = ibuf; 202 c.rcount = iflag; 203 if (ioctl(fd, SMB_BREAD, &c) == -1) 204 return (-1); 205 for (i = 0; i < c.rcount; i++) { 206 if (i != 0) 207 putchar(' '); 208 printf(fmt, ibuf[i]); 209 } 210 putchar('\n'); 211 return (0); 212 } else if (iflag == -1 && oflag > 1) { 213 /* command + > 1 bytes of output: block write */ 214 c.wbuf = obuf; 215 c.wcount = oflag; 216 return (ioctl(fd, SMB_BWRITE, &c)); 217 } 218 219 return (-2); 220 } 221 222 223 int 224 main(int argc, char **argv) 225 { 226 int i, n, errs = 0; 227 int savederrno; 228 229 while ((i = getopt(argc, argv, "F:c:f:i:o:ps:w")) != -1) 230 switch (i) { 231 case 'F': 232 fmt = optarg; 233 break; 234 235 case 'c': 236 if ((cflag = getnum(optarg)) == -1) 237 errx(EX_USAGE, "Invalid number: %s", optarg); 238 if (cflag < 0 || cflag >= 256) 239 errx(EX_USAGE, 240 "CMD out of range: %d", 241 cflag); 242 break; 243 244 case 'f': 245 dev = optarg; 246 break; 247 248 case 'i': 249 if ((iflag = getnum(optarg)) == -1) 250 errx(EX_USAGE, "Invalid number: %s", optarg); 251 if (iflag < 0 || iflag > SMB_MAXBLOCKSIZE) 252 errx(EX_USAGE, 253 "# input bytes out of range: %d", 254 iflag); 255 break; 256 257 case 'o': 258 if ((oflag = getnum(optarg)) == -1) 259 errx(EX_USAGE, "Invalid number: %s", optarg); 260 if (oflag < 0 || oflag > SMB_MAXBLOCKSIZE) 261 errx(EX_USAGE, 262 "# output bytes out of range: %d", 263 oflag); 264 break; 265 266 case 'p': 267 pflag = 1; 268 break; 269 270 case 's': 271 if ((slave = getnum(optarg)) == -1) 272 errx(EX_USAGE, "Invalid number: %s", optarg); 273 274 if (slave < MIN_I2C_ADDR || slave >= MAX_I2C_ADDR) 275 errx(EX_USAGE, 276 "Slave address out of range: %d", 277 slave); 278 break; 279 280 case 'w': 281 wflag = 1; 282 break; 283 284 default: 285 errs++; 286 } 287 argc -= optind; 288 argv += optind; 289 if (errs || (slave != -1 && pflag) || (slave == -1 && !pflag)) 290 usage(); 291 if (wflag && 292 !((iflag == 2 && oflag == -1) || 293 (iflag == -1 && oflag == 2) || 294 (iflag == 2 && oflag == 2))) 295 errx(EX_USAGE, "Illegal # IO bytes for word IO"); 296 if (!pflag && iflag == -1 && oflag == -1) 297 errx(EX_USAGE, "Nothing to do"); 298 if (pflag && (cflag != -1 || iflag != -1 || oflag != -1 || wflag != 0)) 299 usage(); 300 if (oflag > 0) { 301 if (oflag == 2 && wflag) { 302 if (argc == 0) 303 errx(EX_USAGE, "Too few arguments for -o count"); 304 if ((n = getnum(*argv)) == -1) 305 errx(EX_USAGE, "Invalid number: %s", *argv); 306 if (n < 0 || n >= 65535) 307 errx(EX_USAGE, "Value out of range: %d", n); 308 oword = n; 309 argc--; 310 argv++; 311 } else for (i = 0; i < oflag; i++, argv++, argc--) { 312 if (argc == 0) 313 errx(EX_USAGE, "Too few arguments for -o count"); 314 if ((n = getnum(*argv)) == -1) 315 errx(EX_USAGE, "Invalid number: %s", *argv); 316 if (n < 0 || n >= 256) 317 errx(EX_USAGE, "Value out of range: %d", n); 318 obuf[i] = n; 319 } 320 } 321 if (argc != 0) 322 usage(); 323 324 if ((fd = open(dev, O_RDWR)) == -1) 325 err(EX_UNAVAILABLE, "Cannot open %s", dev); 326 327 i = 0; 328 if (pflag) 329 probe_i2c(); 330 else 331 i = do_io(); 332 333 savederrno = errno; 334 close(fd); 335 errno = savederrno; 336 337 if (i == -1) 338 err(EX_UNAVAILABLE, "Error performing SMBus IO"); 339 else if (i == -2) 340 errx(EX_USAGE, "Invalid option combination"); 341 342 return (0); 343 } 344