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In the interest of making long-term branch maintenance incur as little
technical debt on us as possible, we should not maintain any files on
the branch we are not actually using.
This has the added effect of making it extremely clear when merging CLs
from the main branch when changes have the possibility to affect us.
The follow-on CL adds a convenience script to actually pull updates from
the main branch and generate a CL for the update.
BUG=b:204206272
BRANCH=ish
TEST=make BOARD=arcada_ish && make BOARD=drallion_ish
Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Change-Id: I17e4694c38219b5a0823e0a3e55a28d1348f4b18
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3262038
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: Tom Hughes <tomhughes@chromium.org>
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The FROMLIST revision of i2c-pseudo is targeted at the newest Linux
versions, which have new stream_open function and it is preferred for a
pure I/O stream device. However updating to the FROMLIST i2c-pseudo
broke compilation with older kernels that lack stream_open.
Since Linux kernel versions as old as 4.18 are still in common use among
Chrome OS developers, this fixes compatibility by checking for
nonseekable_open and stream_open symbols.
nonseekable_open is only used when stream_open is not found and
nonseekable_open is found. Otherwise stream_open is used.
BRANCH=none
BUG=none
TEST=With Linux 4.18 and Linux 5.2:
$ make
$ # With 4.18 matches nonseekable_open, with 5.2 matches stream_open.
$ strings i2c-pseudo.ko | grep -E -m1 '^(nonseekable_open|stream_open)$'
$ make clean
$ ./install
Signed-off-by: Matthew Blecker <matthewb@chromium.org>
Change-Id: I62c44b1b63e7c4c6a9683be547baa341747f5efa
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2205294
Reviewed-by: Harry Cutts <hcutts@chromium.org>
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This Linux kernel module provides I2C adapters that can be backed by
userspace programs. This allows for userspace implementations of
functionality such as tunneling I2C through another communication channel
to a remote I2C bus.
BRANCH=none
BUG=b:79684405
TEST=Used i2c-tools CLI to i2c-dev to issue I2C queries, and Python
interactive interpreter as the I2C pseudo adapter controller. The
i2c-pseudo module correctly proxied write, read, write+read, and multi-byte
reads through the controller character device, and it correctly proxied
back the responses from the character device, including the specific byte
values read. Later, I implemented an I2C pseudo controller in Servod and
used it to flash an ITE EC over I2C using both Servo Micro and Suzy-Q.
Change-Id: Idda764e56b9e9d577302b59286e873291ea36d25
Signed-off-by: Matthew Blecker <matthewb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1250029
Reviewed-by: Nick Sanders <nsanders@chromium.org>
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