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
usage(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
getnum(const char * s)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
probe_i2c(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
do_io(void)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
main(int argc,char ** argv)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