1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
29 */
30
31 /*
32 * Send or receive messages over an SMBus.
33 */
34
35 #include <err.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <sysexits.h>
42 #include <unistd.h>
43
44 #include <sys/types.h>
45 #include <sys/ioctl.h>
46
47 #include <dev/smbus/smb.h>
48
49 #include "pathnames.h"
50
51 static const char *dev = PATH_DEFAULTSMBDEV;
52 static const char *bytefmt = "0x%02x";
53 static const char *wordfmt = "0x%04x";
54 static const char *fmt;
55
56 static int fd; /* file descriptor for /dev/smbX */
57 static int cflag = -1; /* SMBus cmd */
58 static int iflag = -1; /* input data */
59 static int oflag = -1; /* output data */
60 static int pflag; /* probe bus */
61 static int slave = -1; /* slave address */
62 static int wflag; /* word IO */
63
64 static unsigned char ibuf[SMB_MAXBLOCKSIZE];
65 static unsigned char obuf[SMB_MAXBLOCKSIZE];
66 static unsigned short oword;
67
68 /*
69 * The I2C specs say that all addresses below 16 and above or equal
70 * 240 are reserved. Address 0 is the global address, but we do not
71 * care for this detail.
72 */
73 #define MIN_I2C_ADDR 16
74 #define MAX_I2C_ADDR 240
75
76 static int do_io(void);
77 static int getnum(const char *s);
78 static void probe_i2c(void);
79 static void usage(void);
80
81 static void
usage(void)82 usage(void)
83 {
84 fprintf(stderr,
85 "usage: smbmsg [-f dev] -p\n"
86 " smbmsg [-f dev] -s slave [-F fmt] [-c cmd] [-w] "
87 "[-i incnt] [-o outcnt] [outdata ...]\n");
88 exit(EX_USAGE);
89 }
90
91 static int
getnum(const char * s)92 getnum(const char *s)
93 {
94 char *endp;
95 unsigned long l;
96
97 l = strtoul(s, &endp, 0);
98 if (*s != '\0' && *endp == '\0')
99 return (int)l;
100 return (-1);
101 }
102
103 static void
probe_i2c(void)104 probe_i2c(void)
105 {
106 unsigned char addr;
107 int flags;
108 #define IS_READABLE 1
109 #define IS_WRITEABLE 2
110 struct smbcmd c;
111
112 printf("Probing for devices on %s:\n", dev);
113
114 for (addr = MIN_I2C_ADDR; addr < MAX_I2C_ADDR; addr += 2) {
115 c.slave = addr;
116 flags = 0;
117 if (ioctl(fd, SMB_RECVB, &c) != -1)
118 flags = IS_READABLE;
119 if (ioctl(fd, SMB_QUICK_WRITE, &c) != -1)
120 flags |= IS_WRITEABLE;
121 if (flags != 0) {
122 printf("Device @0x%02x: ", addr);
123 if (flags & IS_READABLE)
124 putchar('r');
125 if (flags & IS_WRITEABLE)
126 putchar('w');
127 putchar('\n');
128 }
129 }
130 }
131
132 static int
do_io(void)133 do_io(void)
134 {
135 struct smbcmd c;
136 int i;
137
138 c.slave = slave;
139 c.cmd = cflag;
140 c.rcount = 0;
141 c.wcount = 0;
142
143 if (fmt == NULL && iflag > 0)
144 fmt = wflag? wordfmt: bytefmt;
145
146 if (cflag == -1) {
147 /* operations that do not require a command byte */
148 if (iflag == -1 && oflag == 0)
149 /* 0 bytes output: quick write operation */
150 return (ioctl(fd, SMB_QUICK_WRITE, &c));
151 else if (iflag == 0 && oflag == -1)
152 /* 0 bytes input: quick read operation */
153 return (ioctl(fd, SMB_QUICK_READ, &c));
154 else if (iflag == 1 && oflag == -1) {
155 /* no command, 1 byte input: receive byte op. */
156 if (ioctl(fd, SMB_RECVB, &c) == -1)
157 return (-1);
158 printf(fmt, (unsigned char)c.cmd);
159 putchar('\n');
160 return (0);
161 } else if (iflag == -1 && oflag == 1) {
162 /* no command, 1 byte output: send byte op. */
163 c.cmd = obuf[0];
164 return (ioctl(fd, SMB_SENDB, &c));
165 } else
166 return (-2);
167 }
168 if (iflag == 1 && oflag == -1) {
169 /* command + 1 byte input: read byte op. */
170 if (ioctl(fd, SMB_READB, &c) == -1)
171 return (-1);
172 printf(fmt, (unsigned char)c.rdata.byte);
173 putchar('\n');
174 return (0);
175 } else if (iflag == -1 && oflag == 1) {
176 /* command + 1 byte output: write byte op. */
177 c.wdata.byte = obuf[0];
178 return (ioctl(fd, SMB_WRITEB, &c));
179 } else if (wflag && iflag == 2 && oflag == -1) {
180 /* command + 2 bytes input: read word op. */
181 if (ioctl(fd, SMB_READW, &c) == -1)
182 return (-1);
183 printf(fmt, (unsigned short)c.rdata.word);
184 putchar('\n');
185 return (0);
186 } else if (wflag && iflag == -1 && oflag == 2) {
187 /* command + 2 bytes output: write word op. */
188 c.wdata.word = oword;
189 return (ioctl(fd, SMB_WRITEW, &c));
190 } else if (wflag && iflag == 2 && oflag == 2) {
191 /*
192 * command + 2 bytes output + 2 bytes input:
193 * "process call" op.
194 */
195 c.wdata.word = oword;
196 if (ioctl(fd, SMB_PCALL, &c) == -1)
197 return (-1);
198 printf(fmt, (unsigned short)c.rdata.word);
199 putchar('\n');
200 return (0);
201 } else if (iflag > 1 && oflag == -1) {
202 /* command + > 1 bytes of input: block read */
203 c.rbuf = ibuf;
204 c.rcount = iflag;
205 if (ioctl(fd, SMB_BREAD, &c) == -1)
206 return (-1);
207 for (i = 0; i < c.rcount; i++) {
208 if (i != 0)
209 putchar(' ');
210 printf(fmt, ibuf[i]);
211 }
212 putchar('\n');
213 return (0);
214 } else if (iflag == -1 && oflag > 1) {
215 /* command + > 1 bytes of output: block write */
216 c.wbuf = obuf;
217 c.wcount = oflag;
218 return (ioctl(fd, SMB_BWRITE, &c));
219 }
220
221 return (-2);
222 }
223
224
225 int
main(int argc,char ** argv)226 main(int argc, char **argv)
227 {
228 int i, n, errs = 0;
229 int savederrno;
230
231 while ((i = getopt(argc, argv, "F:c:f:i:o:ps:w")) != -1)
232 switch (i) {
233 case 'F':
234 fmt = optarg;
235 break;
236
237 case 'c':
238 if ((cflag = getnum(optarg)) == -1)
239 errx(EX_USAGE, "Invalid number: %s", optarg);
240 if (cflag < 0 || cflag >= 256)
241 errx(EX_USAGE,
242 "CMD out of range: %d",
243 cflag);
244 break;
245
246 case 'f':
247 dev = optarg;
248 break;
249
250 case 'i':
251 if ((iflag = getnum(optarg)) == -1)
252 errx(EX_USAGE, "Invalid number: %s", optarg);
253 if (iflag < 0 || iflag > SMB_MAXBLOCKSIZE)
254 errx(EX_USAGE,
255 "# input bytes out of range: %d",
256 iflag);
257 break;
258
259 case 'o':
260 if ((oflag = getnum(optarg)) == -1)
261 errx(EX_USAGE, "Invalid number: %s", optarg);
262 if (oflag < 0 || oflag > SMB_MAXBLOCKSIZE)
263 errx(EX_USAGE,
264 "# output bytes out of range: %d",
265 oflag);
266 break;
267
268 case 'p':
269 pflag = 1;
270 break;
271
272 case 's':
273 if ((slave = getnum(optarg)) == -1)
274 errx(EX_USAGE, "Invalid number: %s", optarg);
275
276 if (slave < MIN_I2C_ADDR || slave >= MAX_I2C_ADDR)
277 errx(EX_USAGE,
278 "Slave address out of range: %d",
279 slave);
280 break;
281
282 case 'w':
283 wflag = 1;
284 break;
285
286 default:
287 errs++;
288 }
289 argc -= optind;
290 argv += optind;
291 if (errs || (slave != -1 && pflag) || (slave == -1 && !pflag))
292 usage();
293 if (wflag &&
294 !((iflag == 2 && oflag == -1) ||
295 (iflag == -1 && oflag == 2) ||
296 (iflag == 2 && oflag == 2)))
297 errx(EX_USAGE, "Illegal # IO bytes for word IO");
298 if (!pflag && iflag == -1 && oflag == -1)
299 errx(EX_USAGE, "Nothing to do");
300 if (pflag && (cflag != -1 || iflag != -1 || oflag != -1 || wflag != 0))
301 usage();
302 if (oflag > 0) {
303 if (oflag == 2 && wflag) {
304 if (argc == 0)
305 errx(EX_USAGE, "Too few arguments for -o count");
306 if ((n = getnum(*argv)) == -1)
307 errx(EX_USAGE, "Invalid number: %s", *argv);
308 if (n < 0 || n >= 65535)
309 errx(EX_USAGE, "Value out of range: %d", n);
310 oword = n;
311 argc--;
312 argv++;
313 } else for (i = 0; i < oflag; i++, argv++, argc--) {
314 if (argc == 0)
315 errx(EX_USAGE, "Too few arguments for -o count");
316 if ((n = getnum(*argv)) == -1)
317 errx(EX_USAGE, "Invalid number: %s", *argv);
318 if (n < 0 || n >= 256)
319 errx(EX_USAGE, "Value out of range: %d", n);
320 obuf[i] = n;
321 }
322 }
323 if (argc != 0)
324 usage();
325
326 if ((fd = open(dev, O_RDWR)) == -1)
327 err(EX_UNAVAILABLE, "Cannot open %s", dev);
328
329 i = 0;
330 if (pflag)
331 probe_i2c();
332 else
333 i = do_io();
334
335 savederrno = errno;
336 close(fd);
337 errno = savederrno;
338
339 if (i == -1)
340 err(EX_UNAVAILABLE, "Error performing SMBus IO");
341 else if (i == -2)
342 errx(EX_USAGE, "Invalid option combination");
343
344 return (0);
345 }
346