Importing usr.sbin/i2cscan

Change-Id: I7b776d6e5f3fe4f7a1af353b995ef9e2e752c7ea
This commit is contained in:
Thomas Cort 2013-07-15 10:29:16 -04:00
parent 550fdfb443
commit 3c59273c97
6 changed files with 271 additions and 1 deletions

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@ -4241,6 +4241,7 @@
./usr/man/man8/halt.8 minix-sys ./usr/man/man8/halt.8 minix-sys
./usr/man/man8/hgfs.8 minix-sys ./usr/man/man8/hgfs.8 minix-sys
./usr/man/man8/httpd.8 minix-sys ./usr/man/man8/httpd.8 minix-sys
./usr/man/man8/i2cscan.8 minix-sys
./usr/man/man8/ifconfig.8 minix-sys ./usr/man/man8/ifconfig.8 minix-sys
./usr/man/man8/inet.8 minix-sys ./usr/man/man8/inet.8 minix-sys
./usr/man/man8/in.httpd.8 minix-sys ./usr/man/man8/in.httpd.8 minix-sys
@ -4315,6 +4316,7 @@
./usr/sbin/groupdel minix-sys ./usr/sbin/groupdel minix-sys
./usr/sbin/groupinfo minix-sys ./usr/sbin/groupinfo minix-sys
./usr/sbin/groupmod minix-sys ./usr/sbin/groupmod minix-sys
./usr/sbin/i2cscan minix-sys
./usr/sbin/inet minix-sys ./usr/sbin/inet minix-sys
./usr/sbin/init minix-sys ./usr/sbin/init minix-sys
./usr/sbin/installboot_nbsd minix-sys ./usr/sbin/installboot_nbsd minix-sys

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@ -183,6 +183,7 @@
2012/10/17 12:00:00,usr.bin/xinstall 2012/10/17 12:00:00,usr.bin/xinstall
2013/03/15 12:00:00,usr.bin/yes 2013/03/15 12:00:00,usr.bin/yes
2012/02/10 16:16:12,usr.sbin/chroot 2012/02/10 16:16:12,usr.sbin/chroot
2013/07/10 15:18:55,usr.sbin/i2cscan
2011/11/03 20:46:41,usr.sbin/installboot 2011/11/03 20:46:41,usr.sbin/installboot
2012/10/17 12:00:00,usr.sbin/Makefile 2012/10/17 12:00:00,usr.sbin/Makefile
2012/10/17 12:00:00,usr.sbin/Makefile.inc 2012/10/17 12:00:00,usr.sbin/Makefile.inc

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@ -5,7 +5,7 @@
SUBDIR= \ SUBDIR= \
chroot \ chroot \
installboot \ i2cscan installboot \
mtree \ mtree \
pwd_mkdb postinstall \ pwd_mkdb postinstall \
rdate user \ rdate user \

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@ -0,0 +1,6 @@
# $NetBSD: Makefile,v 1.2 2011/10/06 12:38:58 wiz Exp $
PROG= i2cscan
MAN= i2cscan.8
.include <bsd.prog.mk>

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@ -0,0 +1,66 @@
.\" $NetBSD: i2cscan.8,v 1.3 2013/07/10 15:18:54 tcort Exp $
.\"
.\" Copyright (c) 2011, 2013 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Thomas Klausner.
.\"
.\" 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 THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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.
.\"
.Dd July 10, 2013
.Dt I2CSCAN 8
.Os
.Sh NAME
.Nm i2cscan
.Nd scan an IIC bus for devices
.Sh SYNOPSIS
.Nm
.Op Fl r
.Ar i2cdev
.Sh DESCRIPTION
The
.Nm
utility scans the IIC bus
.Pq Xr iic 4
specified by
.Ar i2cdev
to determine which addresses respond.
.Pp
Available options:
.Bl -tag -width Ds
.It Fl r
scan using 1 byte reads instead of quick writes.
.El
.Pp
.Em WARNING !
Using this utility can access some devices in such a
manner as to leave them in an unstable or unusable state.
It can also lock up the entire
.Xr iic 4
bus.
Don't use this utility unless you know what you're doing and can
accept all sorts of unforeseen consequences.
.Sh EXIT STATUS
.Ex -std i2cscan
.Sh SEE ALSO
.Xr iic 4

195
usr.sbin/i2cscan/i2cscan.c Normal file
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/* $NetBSD: i2cscan.c,v 1.4 2013/07/10 15:18:54 tcort Exp $ */
/*-
* Copyright (c) 2011, 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Goyette and Jared McNeill
*
* 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 THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: i2cscan.c,v 1.4 2013/07/10 15:18:54 tcort Exp $");
#include <sys/types.h>
#include <sys/ioctl.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dev/i2c/i2c_io.h>
#define MODE_DEFAULT 0
#define MODE_READ 1
__dead static void
usage(void)
{
fprintf(stderr, "usage: %s [-r] <i2cdev>\n", getprogname());
exit(EXIT_FAILURE);
}
static int
iic_smbus_quick_write(int fd, i2c_addr_t addr, int flags)
{
i2c_ioctl_exec_t iie;
iie.iie_op = I2C_OP_WRITE_WITH_STOP;
iie.iie_addr = addr;
iie.iie_cmd = NULL;
iie.iie_cmdlen = 0;
iie.iie_buf = NULL;
iie.iie_buflen = 0;
if (ioctl(fd, I2C_IOCTL_EXEC, &iie) == -1)
return errno;
return 0;
}
static int
iic_smbus_receive_byte(int fd, i2c_addr_t addr, uint8_t *valp, int flags)
{
i2c_ioctl_exec_t iie;
iie.iie_op = I2C_OP_READ_WITH_STOP;
iie.iie_addr = addr;
iie.iie_cmd = NULL;
iie.iie_cmdlen = 0;
iie.iie_buf = valp;
iie.iie_buflen = 1;
if (ioctl(fd, I2C_IOCTL_EXEC, &iie) == -1)
return errno;
return 0;
}
static void
do_i2c_scan(const char *dname, int fd, int mode)
{
int error;
int found = 0;
i2c_addr_t addr;
uint8_t val;
for (addr = 0x09; addr < 0x78; addr++) {
/*
* Skip certain i2c addresses:
* 0x00 General Call / START
* 0x01 CBUS Address
* 0x02 Different Bus format
* 0x03 - 0x07 Reserved
* 0x08 Host Address
* 0x0c Alert Response Address
* 0x28 ACCESS.Bus host
* 0x37 ACCESS.Bus default address
* 0x48 - 0x4b Prototypes
* 0x61 Device Default Address
* 0x78 - 0x7b 10-bit addresses
* 0x7c - 0x7f Reserved
*
* Some of these are skipped by judicious selection
* of the range of the above for (;;) statement.
*
* if (addr <= 0x08 || addr >= 0x78)
* continue;
*/
if (addr == 0x0c || addr == 0x28 || addr == 0x37 ||
addr == 0x61 || (addr & 0x7c) == 0x48)
continue;
/*
* Use SMBus quick_write command to detect most
* addresses; should avoid hanging the bus on
* some write-only devices (like clocks that show
* up at address 0x69)
*
* XXX The quick_write() is allegedly known to
* XXX corrupt the Atmel AT24RF08 EEPROM found
* XXX on some IBM Thinkpads!
*/
printf("\r%s: scanning 0x%02x", dname, addr);
fflush(stdout);
if ((addr & 0xf8) == 0x30 ||
(addr & 0xf0) == 0x50 ||
mode == MODE_READ)
error = iic_smbus_receive_byte(fd, addr, &val, 0);
else
error = iic_smbus_quick_write(fd, addr, 0);
if (error == 0) {
printf("\r%s: found device at 0x%02x\n",
dname, addr);
++found;
}
}
if (found == 0)
printf("\r%s: no devices found\n", dname);
else
printf("\r%s: %d devices found\n", dname, found);
}
int
main(int argc, char *argv[])
{
int fd;
int ch, rflag;
int mode;
setprogname(*argv);
rflag = 0;
while ((ch = getopt(argc, argv, "r")) != -1)
switch (ch) {
case 'r':
rflag = 1;
break;
default:
break;
}
argv += optind;
argc -= optind;
if (rflag)
mode = MODE_READ;
else
mode = MODE_DEFAULT;
if (*argv == NULL)
usage();
fd = open(*argv, O_RDWR);
if (fd == -1)
err(EXIT_FAILURE, "couldn't open %s", *argv);
do_i2c_scan(*argv, fd, mode);
close(fd);
return EXIT_SUCCESS;
}