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add userland implementation of I2C_SCAN code

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This commit is contained in:
jmcneill 2011-10-02 16:48:47 +00:00
parent ab747348b5
commit f11f373e5d
3 changed files with 184 additions and 1 deletions
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3
distrib/sets/lists/base/mi
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@ -1,4 +1,4 @@
# $NetBSD: mi,v 1.956 2011/09/11 19:10:56 christos Exp $
# $NetBSD: mi,v 1.957 2011/10/02 16:48:47 jmcneill Exp $
#
# Note: Don't delete entries from here - mark them as "obsolete" instead,
# unless otherwise stated below.
@ -1224,6 +1224,7 @@
./usr/sbin/hostapd_cli base-sysutil-bin
./usr/sbin/hprop base-krb5-bin kerberos
./usr/sbin/htable base-obsolete obsolete
./usr/sbin/i2cscan base-sysutil-bin
./usr/sbin/ifmcstat base-netutil-bin inet6
./usr/sbin/ifwatchd base-netutil-bin
./usr/sbin/inetd base-netutil-bin

6
usr.sbin/i2cscan/Makefile Normal file
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@ -0,0 +1,6 @@
# $NetBSD: Makefile,v 1.1 2011/10/02 16:48:47 jmcneill Exp $
PROG= i2cscan
NOMAN= # defined
.include <bsd.prog.mk>

176
usr.sbin/i2cscan/i2cscan.c Normal file
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@ -0,0 +1,176 @@
/* $NetBSD: i2cscan.c,v 1.1 2011/10/02 16:48:47 jmcneill Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* Copyright (c) 2011 Jared D. McNeill <jmcneill@invisible.ca>
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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 1.1 2011/10/02 16:48:47 jmcneill 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>
static void
usage(const char *pn)
{
fprintf(stderr, "usage: %s <i2cdev>\n", pn);
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 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)
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;
if (argc != 2)
usage(argv[0]);
fd = open(argv[1], O_RDWR);
if (fd == -1)
err(EXIT_FAILURE, "couldn't open %s", argv[1]);
do_i2c_scan(argv[1], fd);
close(fd);
return EXIT_SUCCESS;
}