Importing usr.sbin/i2cscan
Change-Id: I7b776d6e5f3fe4f7a1af353b995ef9e2e752c7ea
This commit is contained in:
Thomas Cort
parent
550fdfb443
commit
3c59273c97
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@ -4241,6 +4241,7 @@
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./usr/man/man8/halt.8 minix-sys
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./usr/man/man8/hgfs.8 minix-sys
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./usr/man/man8/httpd.8 minix-sys
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./usr/man/man8/i2cscan.8 minix-sys
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./usr/man/man8/ifconfig.8 minix-sys
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./usr/man/man8/inet.8 minix-sys
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./usr/man/man8/in.httpd.8 minix-sys
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@ -4315,6 +4316,7 @@
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./usr/sbin/groupdel minix-sys
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./usr/sbin/groupinfo minix-sys
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./usr/sbin/groupmod minix-sys
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./usr/sbin/i2cscan minix-sys
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./usr/sbin/inet minix-sys
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./usr/sbin/init minix-sys
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./usr/sbin/installboot_nbsd minix-sys
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@ -183,6 +183,7 @@
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2012/10/17 12:00:00,usr.bin/xinstall
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2013/03/15 12:00:00,usr.bin/yes
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2012/02/10 16:16:12,usr.sbin/chroot
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2013/07/10 15:18:55,usr.sbin/i2cscan
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2011/11/03 20:46:41,usr.sbin/installboot
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2012/10/17 12:00:00,usr.sbin/Makefile
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2012/10/17 12:00:00,usr.sbin/Makefile.inc
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@ -5,7 +5,7 @@
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SUBDIR= \
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chroot \
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installboot \
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i2cscan installboot \
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mtree \
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pwd_mkdb postinstall \
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rdate user \
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@ -0,0 +1,6 @@
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# $NetBSD: Makefile,v 1.2 2011/10/06 12:38:58 wiz Exp $
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PROG= i2cscan
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MAN= i2cscan.8
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.include <bsd.prog.mk>
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@ -0,0 +1,66 @@
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.\" $NetBSD: i2cscan.8,v 1.3 2013/07/10 15:18:54 tcort Exp $
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.\"
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.\" Copyright (c) 2011, 2013 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Thomas Klausner.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 10, 2013
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.Dt I2CSCAN 8
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.Os
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.Sh NAME
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.Nm i2cscan
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.Nd scan an IIC bus for devices
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.Sh SYNOPSIS
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.Nm
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.Op Fl r
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.Ar i2cdev
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.Sh DESCRIPTION
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The
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.Nm
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utility scans the IIC bus
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.Pq Xr iic 4
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specified by
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.Ar i2cdev
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to determine which addresses respond.
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.Pp
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Available options:
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.Bl -tag -width Ds
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.It Fl r
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scan using 1 byte reads instead of quick writes.
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.El
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.Pp
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.Em WARNING !
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Using this utility can access some devices in such a
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manner as to leave them in an unstable or unusable state.
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It can also lock up the entire
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.Xr iic 4
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bus.
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Don't use this utility unless you know what you're doing and can
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accept all sorts of unforeseen consequences.
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.Sh EXIT STATUS
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.Ex -std i2cscan
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.Sh SEE ALSO
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.Xr iic 4
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@ -0,0 +1,195 @@
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/* $NetBSD: i2cscan.c,v 1.4 2013/07/10 15:18:54 tcort Exp $ */
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/*-
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* Copyright (c) 2011, 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Paul Goyette and Jared McNeill
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: i2cscan.c,v 1.4 2013/07/10 15:18:54 tcort Exp $");
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dev/i2c/i2c_io.h>
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#define MODE_DEFAULT 0
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#define MODE_READ 1
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__dead static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-r] <i2cdev>\n", getprogname());
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exit(EXIT_FAILURE);
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}
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static int
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iic_smbus_quick_write(int fd, i2c_addr_t addr, int flags)
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{
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i2c_ioctl_exec_t iie;
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iie.iie_op = I2C_OP_WRITE_WITH_STOP;
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iie.iie_addr = addr;
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iie.iie_cmd = NULL;
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iie.iie_cmdlen = 0;
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iie.iie_buf = NULL;
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iie.iie_buflen = 0;
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if (ioctl(fd, I2C_IOCTL_EXEC, &iie) == -1)
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return errno;
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return 0;
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}
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static int
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iic_smbus_receive_byte(int fd, i2c_addr_t addr, uint8_t *valp, int flags)
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{
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i2c_ioctl_exec_t iie;
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iie.iie_op = I2C_OP_READ_WITH_STOP;
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iie.iie_addr = addr;
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iie.iie_cmd = NULL;
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iie.iie_cmdlen = 0;
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iie.iie_buf = valp;
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iie.iie_buflen = 1;
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if (ioctl(fd, I2C_IOCTL_EXEC, &iie) == -1)
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return errno;
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return 0;
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}
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static void
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do_i2c_scan(const char *dname, int fd, int mode)
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{
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int error;
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int found = 0;
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i2c_addr_t addr;
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uint8_t val;
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for (addr = 0x09; addr < 0x78; addr++) {
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/*
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* Skip certain i2c addresses:
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* 0x00 General Call / START
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* 0x01 CBUS Address
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* 0x02 Different Bus format
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* 0x03 - 0x07 Reserved
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* 0x08 Host Address
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* 0x0c Alert Response Address
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* 0x28 ACCESS.Bus host
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* 0x37 ACCESS.Bus default address
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* 0x48 - 0x4b Prototypes
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* 0x61 Device Default Address
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* 0x78 - 0x7b 10-bit addresses
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* 0x7c - 0x7f Reserved
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*
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* Some of these are skipped by judicious selection
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* of the range of the above for (;;) statement.
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*
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* if (addr <= 0x08 || addr >= 0x78)
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* continue;
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*/
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if (addr == 0x0c || addr == 0x28 || addr == 0x37 ||
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addr == 0x61 || (addr & 0x7c) == 0x48)
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continue;
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/*
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* Use SMBus quick_write command to detect most
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* addresses; should avoid hanging the bus on
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* some write-only devices (like clocks that show
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* up at address 0x69)
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*
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* XXX The quick_write() is allegedly known to
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* XXX corrupt the Atmel AT24RF08 EEPROM found
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* XXX on some IBM Thinkpads!
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*/
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printf("\r%s: scanning 0x%02x", dname, addr);
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fflush(stdout);
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if ((addr & 0xf8) == 0x30 ||
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(addr & 0xf0) == 0x50 ||
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mode == MODE_READ)
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error = iic_smbus_receive_byte(fd, addr, &val, 0);
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else
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error = iic_smbus_quick_write(fd, addr, 0);
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if (error == 0) {
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printf("\r%s: found device at 0x%02x\n",
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dname, addr);
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++found;
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}
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}
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if (found == 0)
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printf("\r%s: no devices found\n", dname);
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else
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printf("\r%s: %d devices found\n", dname, found);
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}
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int
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main(int argc, char *argv[])
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{
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int fd;
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int ch, rflag;
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int mode;
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setprogname(*argv);
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rflag = 0;
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while ((ch = getopt(argc, argv, "r")) != -1)
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switch (ch) {
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case 'r':
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rflag = 1;
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break;
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default:
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break;
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}
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argv += optind;
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argc -= optind;
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if (rflag)
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mode = MODE_READ;
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else
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mode = MODE_DEFAULT;
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if (*argv == NULL)
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usage();
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fd = open(*argv, O_RDWR);
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if (fd == -1)
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err(EXIT_FAILURE, "couldn't open %s", *argv);
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do_i2c_scan(*argv, fd, mode);
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close(fd);
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return EXIT_SUCCESS;
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}
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