FreeBSD-5.3/usr.sbin/smbmsg/smbmsg.c
/*-
* Copyright (C) 2004 Joerg Wunsch
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/usr.sbin/smbmsg/smbmsg.c,v 1.3 2004/05/27 13:31:16 joerg Exp $
*/
/*
* Send or receive messages over an SMBus.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <dev/smbus/smb.h>
#include "pathnames.h"
static const char *dev = PATH_DEFAULTSMBDEV;
static const char *bytefmt = "0x%02x";
static const char *wordfmt = "0x%04x";
static const char *fmt;
static int fd; /* file descriptor for /dev/smbX */
static int cflag = -1; /* SMBus cmd */
static int iflag = -1; /* input data */
static int oflag = -1; /* output data */
static int pflag; /* probe bus */
static int slave = -1; /* slave address */
static int wflag; /* word IO */
static unsigned char ibuf[SMB_MAXBLOCKSIZE];
static unsigned char obuf[SMB_MAXBLOCKSIZE];
static unsigned short oword, iword;
/*
* The I2C specs say that all addresses below 16 and above or equal
* 240 are reserved. Address 0 is the global address, but we do not
* care for this detail.
*/
#define MIN_I2C_ADDR 16
#define MAX_I2C_ADDR 240
static int do_io(void);
static int getnum(const char *s);
static void probe_i2c(void);
static void usage(void);
static void
usage(void)
{
fprintf(stderr,
"usage: smbmsg [-f dev] -p\n"
" smbmsg [-f dev] -s slave [-F fmt] [-c cmd] [-w] "
"[-i incnt] [-o outcnt] [outdata ...]\n");
exit(EX_USAGE);
}
static int
getnum(const char *s)
{
char *endp;
unsigned long l;
l = strtoul(s, &endp, 0);
if (*s != '\0' && *endp == '\0')
return (int)l;
return (-1);
}
static void
probe_i2c(void)
{
unsigned char addr;
int flags;
#define IS_READABLE 1
#define IS_WRITEABLE 2
struct smbcmd c;
printf("Probing for devices on %s:\n", dev);
for (addr = MIN_I2C_ADDR; addr < MAX_I2C_ADDR; addr += 2) {
c.slave = addr;
flags = 0;
if (ioctl(fd, SMB_RECVB, &c) != -1)
flags = IS_READABLE;
if (ioctl(fd, SMB_QUICK_WRITE, &c) != -1)
flags |= IS_WRITEABLE;
if (flags != 0) {
printf("Device @0x%02x: ", addr);
if (flags & IS_READABLE)
putchar('r');
if (flags & IS_WRITEABLE)
putchar('w');
putchar('\n');
}
}
}
static int
do_io(void)
{
struct smbcmd c;
int i;
c.slave = slave;
c.cmd = cflag;
if (fmt == NULL && iflag > 0)
fmt = wflag? wordfmt: bytefmt;
if (cflag == -1) {
/* operations that do not require a command byte */
if (iflag == -1 && oflag == 0)
/* 0 bytes output: quick write operation */
return (ioctl(fd, SMB_QUICK_WRITE, &c));
else if (iflag == 0 && oflag == -1)
/* 0 bytes input: quick read operation */
return (ioctl(fd, SMB_QUICK_READ, &c));
else if (iflag == 1 && oflag == -1) {
/* no command, 1 byte input: receive byte op. */
if (ioctl(fd, SMB_RECVB, &c) == -1)
return (-1);
printf(fmt, (unsigned char)c.cmd);
putchar('\n');
return (0);
} else if (iflag == -1 && oflag == 1) {
/* no command, 1 byte output: send byte op. */
c.cmd = obuf[0];
return (ioctl(fd, SMB_SENDB, &c));
} else
return (-2);
}
if (iflag == 1 && oflag == -1) {
/* command + 1 byte input: read byte op. */
c.data.byte_ptr = ibuf;
if (ioctl(fd, SMB_READB, &c) == -1)
return (-1);
printf(fmt, (int)(unsigned char)ibuf[0]);
putchar('\n');
return (0);
} else if (iflag == -1 && oflag == 1) {
/* command + 1 byte output: write byte op. */
c.data.byte = obuf[0];
return (ioctl(fd, SMB_WRITEB, &c));
} else if (wflag && iflag == 2 && oflag == -1) {
/* command + 2 bytes input: read word op. */
c.data.word_ptr = &iword;
if (ioctl(fd, SMB_READW, &c) == -1)
return (-1);
printf(fmt, (int)(unsigned short)iword);
putchar('\n');
return (0);
} else if (wflag && iflag == -1 && oflag == 2) {
/* command + 2 bytes output: write word op. */
c.data.word = oword;
return (ioctl(fd, SMB_WRITEW, &c));
} else if (wflag && iflag == 2 && oflag == 2) {
/*
* command + 2 bytes output + 2 bytes input:
* "process call" op.
*/
c.data.process.sdata = oword;
c.data.process.rdata = &iword;
if (ioctl(fd, SMB_PCALL, &c) == -1)
return (-1);
printf(fmt, (int)(unsigned short)iword);
putchar('\n');
return (0);
} else if (iflag > 1 && oflag == -1) {
/* command + > 1 bytes of input: block read */
c.data.byte_ptr = ibuf;
c.count = iflag;
if (ioctl(fd, SMB_BREAD, &c) == -1)
return (-1);
for (i = 0; i < iflag; i++) {
if (i != 0)
putchar(' ');
printf(fmt, ibuf[i]);
}
putchar('\n');
return (0);
} else if (iflag == -1 && oflag > 1) {
/* command + > 1 bytes of output: block write */
c.data.byte_ptr = obuf;
c.count = oflag;
return (ioctl(fd, SMB_BWRITE, &c));
}
return (-2);
}
int
main(int argc, char **argv)
{
int i, n, errs = 0;
int savederrno;
while ((i = getopt(argc, argv, "F:c:f:i:o:ps:w")) != -1)
switch (i) {
case 'F':
fmt = optarg;
break;
case 'c':
if ((cflag = getnum(optarg)) == -1)
errx(EX_USAGE, "Invalid number: %s", optarg);
if (cflag < 0 || cflag >= 256)
errx(EX_USAGE,
"CMD out of range: %d",
cflag);
break;
case 'f':
dev = optarg;
break;
case 'i':
if ((iflag = getnum(optarg)) == -1)
errx(EX_USAGE, "Invalid number: %s", optarg);
if (iflag < 0 || iflag > SMB_MAXBLOCKSIZE)
errx(EX_USAGE,
"# input bytes out of range: %d",
iflag);
break;
case 'o':
if ((oflag = getnum(optarg)) == -1)
errx(EX_USAGE, "Invalid number: %s", optarg);
if (oflag < 0 || oflag > SMB_MAXBLOCKSIZE)
errx(EX_USAGE,
"# output bytes out of range: %d",
oflag);
break;
case 'p':
pflag = 1;
break;
case 's':
if ((slave = getnum(optarg)) == -1)
errx(EX_USAGE, "Invalid number: %s", optarg);
if (slave < MIN_I2C_ADDR || slave >= MAX_I2C_ADDR)
errx(EX_USAGE,
"Slave address out of range: %d",
slave);
break;
case 'w':
wflag = 1;
break;
default:
errs++;
}
argc -= optind;
argv += optind;
if (errs || (slave != -1 && pflag) || (slave == -1 && !pflag))
usage();
if (wflag &&
!((iflag == 2 && oflag == -1) ||
(iflag == -1 && oflag == 2) ||
(iflag == 2 && oflag == 2)))
errx(EX_USAGE, "Illegal # IO bytes for word IO");
if (!pflag && iflag == -1 && oflag == -1)
errx(EX_USAGE, "Nothing to do");
if (pflag && (cflag != -1 || iflag != -1 || oflag != -1 || wflag != 0))
usage();
if (oflag > 0) {
if (oflag == 2 && wflag) {
if (argc == 0)
errx(EX_USAGE, "Too few arguments for -o count");
if ((n = getnum(*argv)) == -1)
errx(EX_USAGE, "Invalid number: %s", *argv);
if (n < 0 || n >= 65535)
errx(EX_USAGE, "Value out of range: %d", n);
oword = n;
argc--;
argv++;
} else for (i = 0; i < oflag; i++, argv++, argc--) {
if (argc == 0)
errx(EX_USAGE, "Too few arguments for -o count");
if ((n = getnum(*argv)) == -1)
errx(EX_USAGE, "Invalid number: %s", *argv);
if (n < 0 || n >= 256)
errx(EX_USAGE, "Value out of range: %d", n);
obuf[i] = n;
}
}
if (argc != 0)
usage();
if ((fd = open(dev, O_RDWR)) == -1)
err(EX_UNAVAILABLE, "Cannot open %s", dev);
i = 0;
if (pflag)
probe_i2c();
else
i = do_io();
savederrno = errno;
close(fd);
errno = savederrno;
if (i == -1)
err(EX_UNAVAILABLE, "Error performing SMBus IO");
else if (i == -2)
errx(EX_USAGE, "Invalid option combination");
return (0);
}