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
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
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.rbuf = ibuf;
167 c.rcount = iflag;
168 if (ioctl(fd, SMB_READB, &c) == -1)
169 return (-1);
170 printf(fmt, (int)(unsigned char)ibuf[0]);
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 c.rbuf = (char*) &iword;
180 c.rcount = iflag;
181 if (ioctl(fd, SMB_READW, &c) == -1)
182 return (-1);
183 printf(fmt, (int)(unsigned short)iword);
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 c.rbuf = (char*) &iword;
197 c.rcount = iflag;
198 if (ioctl(fd, SMB_PCALL, &c) == -1)
199 return (-1);
200 printf(fmt, (int)(unsigned short)iword);
201 putchar('\n');
202 return (0);
203 } else if (iflag > 1 && oflag == -1) {
204 /* command + > 1 bytes of input: block read */
205 c.rbuf = ibuf;
206 c.rcount = iflag;
207 if (ioctl(fd, SMB_BREAD, &c) == -1)
208 return (-1);
209 for (i = 0; i < iflag; i++) {
210 if (i != 0)
211 putchar(' ');
212 printf(fmt, ibuf[i]);
213 }
214 putchar('\n');
215 return (0);
216 } else if (iflag == -1 && oflag > 1) {
217 /* command + > 1 bytes of output: block write */
218 c.wbuf = obuf;
219 c.wcount = oflag;
220 return (ioctl(fd, SMB_BWRITE, &c));
221 }
222
223 return (-2);
224 }
225
226
227 int
main(int argc,char ** argv)228 main(int argc, char **argv)
229 {
230 int i, n, errs = 0;
231 int savederrno;
232
233 while ((i = getopt(argc, argv, "F:c:f:i:o:ps:w")) != -1)
234 switch (i) {
235 case 'F':
236 fmt = optarg;
237 break;
238
239 case 'c':
240 if ((cflag = getnum(optarg)) == -1)
241 errx(EX_USAGE, "Invalid number: %s", optarg);
242 if (cflag < 0 || cflag >= 256)
243 errx(EX_USAGE,
244 "CMD out of range: %d",
245 cflag);
246 break;
247
248 case 'f':
249 dev = optarg;
250 break;
251
252 case 'i':
253 if ((iflag = getnum(optarg)) == -1)
254 errx(EX_USAGE, "Invalid number: %s", optarg);
255 if (iflag < 0 || iflag > SMB_MAXBLOCKSIZE)
256 errx(EX_USAGE,
257 "# input bytes out of range: %d",
258 iflag);
259 break;
260
261 case 'o':
262 if ((oflag = getnum(optarg)) == -1)
263 errx(EX_USAGE, "Invalid number: %s", optarg);
264 if (oflag < 0 || oflag > SMB_MAXBLOCKSIZE)
265 errx(EX_USAGE,
266 "# output bytes out of range: %d",
267 oflag);
268 break;
269
270 case 'p':
271 pflag = 1;
272 break;
273
274 case 's':
275 if ((slave = getnum(optarg)) == -1)
276 errx(EX_USAGE, "Invalid number: %s", optarg);
277
278 if (slave < MIN_I2C_ADDR || slave >= MAX_I2C_ADDR)
279 errx(EX_USAGE,
280 "Slave address out of range: %d",
281 slave);
282 break;
283
284 case 'w':
285 wflag = 1;
286 break;
287
288 default:
289 errs++;
290 }
291 argc -= optind;
292 argv += optind;
293 if (errs || (slave != -1 && pflag) || (slave == -1 && !pflag))
294 usage();
295 if (wflag &&
296 !((iflag == 2 && oflag == -1) ||
297 (iflag == -1 && oflag == 2) ||
298 (iflag == 2 && oflag == 2)))
299 errx(EX_USAGE, "Illegal # IO bytes for word IO");
300 if (!pflag && iflag == -1 && oflag == -1)
301 errx(EX_USAGE, "Nothing to do");
302 if (pflag && (cflag != -1 || iflag != -1 || oflag != -1 || wflag != 0))
303 usage();
304 if (oflag > 0) {
305 if (oflag == 2 && wflag) {
306 if (argc == 0)
307 errx(EX_USAGE, "Too few arguments for -o count");
308 if ((n = getnum(*argv)) == -1)
309 errx(EX_USAGE, "Invalid number: %s", *argv);
310 if (n < 0 || n >= 65535)
311 errx(EX_USAGE, "Value out of range: %d", n);
312 oword = n;
313 argc--;
314 argv++;
315 } else for (i = 0; i < oflag; i++, argv++, argc--) {
316 if (argc == 0)
317 errx(EX_USAGE, "Too few arguments for -o count");
318 if ((n = getnum(*argv)) == -1)
319 errx(EX_USAGE, "Invalid number: %s", *argv);
320 if (n < 0 || n >= 256)
321 errx(EX_USAGE, "Value out of range: %d", n);
322 obuf[i] = n;
323 }
324 }
325 if (argc != 0)
326 usage();
327
328 if ((fd = open(dev, O_RDWR)) == -1)
329 err(EX_UNAVAILABLE, "Cannot open %s", dev);
330
331 i = 0;
332 if (pflag)
333 probe_i2c();
334 else
335 i = do_io();
336
337 savederrno = errno;
338 close(fd);
339 errno = savederrno;
340
341 if (i == -1)
342 err(EX_UNAVAILABLE, "Error performing SMBus IO");
343 else if (i == -2)
344 errx(EX_USAGE, "Invalid option combination");
345
346 return (0);
347 }
348