Commit Graph

30 Commits

Author SHA1 Message Date
Ian Lepore
a30555576c Add a new 'tr' (transfer) mode to i2c(8) to support more i2c controllers.
Some i2c controller hardware does not provide a way to do individual START,
REPEAT-START and STOP actions on the i2c bus.  Instead, they can only do
a complete transfer as a single operation.  Typically they can do either
START-data-STOP or START-data-REPEATSTART-data-STOP.  In the i2c driver
framework, this corresponds to the iicbus_transfer method.  In the userland
interface they are initiated with the I2CRDWR ioctl command.

These changes add a new 'tr' mode which can be specified with the '-m'
command line option.  This mode should work on all hardware; when an i2c
controller driver doesn't directly support the iicbus_transfer method,
code in the i2c driver framework uses the lower-level START/REPEAT/STOP
methods to implement the transfer.  After this new mode has gotten some
testing on various hardware, the 'tr' mode should probably become the
new default mode.

PR:		189914
2019-05-22 21:06:10 +00:00
Pedro F. Giffuni
1de7b4b805 various: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:37:16 +00:00
Bryan Drewery
ea825d0274 DIRDEPS_BUILD: Update dependencies.
Sponsored by:	Dell EMC Isilon
2017-10-31 00:07:04 +00:00
Andriy Gapon
668f9cbec0 i2c(8): clean up and clarify read operation
The code went to a lot of trouble to issue either a start+stop condition
or a repeated start condition only to follow it with a stop condition
and a read(2) call that issues a new start condition.
So, fix the read in I2C_MODE_REPEATED_START mode by using I2CREAD ioctl
within the running transaction.  This obviously requires that the slave
address has the read bit set which was not required before.

Another problem was with width parameter of zero and
I2C_MODE_REPEATED_START mode.  In that case we issued a repeated start
without any preceding start.

While here, remove the redundant (unused) argument to I2CSTOP throughout
the program.
Also, clarify the meaning of -w option, especially "-w 0", in the manual
page.

Reviewed by:	no one
Differential Revision: https://reviews.freebsd.org/D12331
2017-10-13 09:21:41 +00:00
Ian Lepore
c3c16dce19 Make i2c -s (device scan) work on hardware that supports only full xfers.
The existing scan code is based on sending an i2c START condition and if
there is no error it assumes there is a device at that i2c address.  Some
i2c controllers don't support sending individual start/stop signals on the
bus, they can only perform complete data transfers with start/stop handled
in the silicon.

This adds a fallback mechanism that attempts to read a single byte from each
i2c address.  It's less reliable than looking for an an ACK repsonse to a
start, because some devices will NAK an attempt to read that isn't preceeded
by a write of a register address.  Writing to devices to probe them is too
dangerous to even consider.  The user is told that a less-reliable scan is
being done, so even if the read-scan comes up empty too, it's still a vast
improvement over the old situation where it would just claim there were no
devices on the bus even though the devices were there and working fine.

If the i2c controller responds with a proper ENODEV (device doesn't support
operation) or an almost-proper EOPNOTSUPP, the START/STOP scan is switched
to a read-scan right away.  Most controllers respond with ENXIO or EIO if
they don't support START/STOP, so no quick-out is available.  For those,
if a scan of all 127 addresses and come up empty, the scan is re-done using
the read method.

Reported by:	Maxim Filimonov <che@bein.link>
2017-09-11 21:49:38 +00:00
Nick Hibma
a96032e552 More typos in strings.
Submitted by:	bde
MFC after:	3 days
2016-12-02 11:30:21 +00:00
Nick Hibma
16e7325493 Speling fixes and fix line endings for err_msg output.
In some cases there was not \n, in other cases there was.
2016-12-01 09:14:58 +00:00
Pedro F. Giffuni
48235fe344 i2c(8): uninitialized variable (UNINIT).
If i2c_opt.width is somehow zero, buf will be left uninitialized and may
cause trouble later on. This is a followup to r299586.

CID:	1331548
2016-05-13 15:57:55 +00:00
Pedro F. Giffuni
b1f46f712f i2c(8): uninitialized variable (UNINIT).
If i2c_opt.width is somehow zero, the bufsize will be left uninitialized
and make cause trouble later on.

CID:		1331549
2016-05-13 02:58:11 +00:00
Zbigniew Bodek
58172d8cc0 Perform I2C transmission in a single burst when mode is "none" or not set
Some more automated I2C controllers cannot explicitly create
START/STOP/etc. conditions on the bus.
Instead, the correct condition is set automatically according
to the pending transfer status.
This particular behavior can cause trouble if some I2C slave
requires sending address offset within the chip followed by
the actual data or command. In that case we cannot assume that
the driver will not STOP immediately after sending
offset.

To avoid that, do not split offset transfer from data transfer
for default transmission modes and do exactly that if requested
in command line (stop-start and repeated-start modes).
This more generic approach should cover special cases like
the one described.

Reviewed by:   imp
Submitted by:  Marcin Mazurek <mma@semihalf.com>
Obtained from: Semihalf
2015-09-15 11:21:16 +00:00
Simon J. Gerraty
ccfb965433 Add META_MODE support.
Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision:       D2796
Reviewed by: brooks imp
2015-06-13 19:20:56 +00:00
Simon J. Gerraty
44d314f704 dirdeps.mk now sets DEP_RELDIR 2015-06-08 23:35:17 +00:00
Simon J. Gerraty
9268022b74 Merge from head@274682 2014-11-19 01:07:58 +00:00
Luiz Otavio O Souza
82a2ce4062 Fix a few cases of use of uninitialized variables. Found with -Wall.
MFC after:	1 week
2014-11-12 03:59:26 +00:00
Simon J. Gerraty
ee7b0571c2 Merge head from 7/28 2014-08-19 06:50:54 +00:00
Baptiste Daroussin
01c2b8ac0d use .Mt to mark up email addresses consistently (part2)
PR:		191174
Submitted by:	Franco Fichtner  <franco@lastsummer.de>
2014-06-20 09:57:27 +00:00
Simon J. Gerraty
fae50821ae Updated dependencies 2014-05-16 14:09:51 +00:00
Simon J. Gerraty
76b28ad6ab Updated dependencies 2014-05-10 05:16:28 +00:00
Simon J. Gerraty
7cf3a1c6b2 Updated dependencies 2013-03-11 17:21:52 +00:00
Simon J. Gerraty
f5f7c05209 Updated dependencies 2013-02-16 01:23:54 +00:00
Marcel Moolenaar
7750ad47a9 Sync FreeBSD's bmake branch with Juniper's internal bmake branch.
Requested by: Simon Gerraty <sjg@juniper.net>
2012-08-22 19:25:57 +00:00
Warren Block
344c81a166 Fixes to man8 groff mandoc style, usage mistakes, or typos.
PR:		168016
Submitted by:	Nobuyuki Koganemaru
Approved by:	gjb
MFC after:	3 days
2012-05-24 02:24:03 +00:00
Eitan Adler
50d675f7a9 Remove trailing whitespace per mdoc lint warning
Disussed with:	gavin
No objection from:	doc
Approved by:	joel
MFC after:	3 days
2012-03-29 05:02:12 +00:00
Eitan Adler
3f028229d9 Fix warning when compiling with gcc46:
error: variable 'i2c' set but not used

Approved by:	dim, cperciva (mentor, blanket for pre-mentorship already-approved commits)
MFC after:	3 days
2012-01-20 01:38:44 +00:00
Dimitry Andric
928e797dc0 In usr.sbin/i2c/i2c.c, fix a few warnings about format strings not being
literals.

MFC after:	1 week
2011-12-17 20:12:17 +00:00
Ulrich Spörlein
0d9deed52c mdoc: drop redundant .Pp and .LP calls
They have no effect when coming in pairs, or before .Bl/.Bd
2010-10-08 12:40:16 +00:00
Joel Dahl
c2025a7660 Fix typos, spelling, formatting and mdoc mistakes found by Nobuyuki while
translating these manual pages.  Minor corrections by me.

Submitted by:	Nobuyuki Koganemaru <n-kogane@syd.odn.ne.jp>
2010-08-16 15:18:30 +00:00
Ulrich Spörlein
7d6c0d150d mdoc: Remove leading garbage, empty lines and order preamble 2010-05-27 13:56:19 +00:00
Christian Brueffer
cf6c5eebe7 Use our canonical .Dd format.
Submitted by:	Ulrich Spoerlein
2009-11-02 12:35:38 +00:00
Rafal Jaworowski
477f656bb9 Introduce the I2C diagnostic utility. It let's discover and inspect slave
devices on the bus.

Reviewed by:	bms, stas
Obtained from:	Semihalf
2009-01-26 14:00:50 +00:00