[PATCH v4 0/2] i2c-tools: Make tools accept bus path

[Brigham Campbell <me@brighamcampbell.com>]

The purpose of this series is to make i2c-tools userspace utilities
accept an i2c bus character device file path as an argument. This is
useful, for example, if a sysadmin creates udev rules to create a
persistent symlink to an i2c bus and wishes to use that symlink with
i2c-tools.

I've tested these changes by running i2cdetect, i2cget, and i2cset.
Please be aware that my current test setup has an i801 bus controller
with what seems to be no slave devices connected, so my testing has been
superficial, involving mostly failed read/writes. This patch series only
touches code that actually opens the character device file, so I'm
satisfied with this testing. If maintainers prefer, I'm happy to test
more rigorously.

Since v1:
 * Scrapped brittle checking against device major number 89 in favor of
   an i2c_bus_hint variant struct.
Since v2:
 * Scrapped i2c_bus_hint variant in favor of combining the lookup and
   open steps into one function. No more awkward variant.
Since v3:
 * Rebased onto `master` and fixed minor conflicts.

Signed-off-by: Brigham Campbell <me@brighamcampbell.com>
---
Brigham Campbell (2):
      i2c-tools: Allow passing device file paths
      i2c-tools: Document device paths as I2CBUS arg

 tools/i2cbusses.c   | 40 ++++++++++++++++++++++++++++++++++------
 tools/i2cbusses.h   |  4 +++-
 tools/i2cdetect.8   |  8 ++++----
 tools/i2cdetect.c   | 14 +++++---------
 tools/i2cdump.8     |  7 ++++---
 tools/i2cdump.c     | 14 +++++---------
 tools/i2cget.8      |  9 +++++----
 tools/i2cget.c      | 13 +++++--------
 tools/i2cset.8      | 12 ++++++------
 tools/i2cset.c      | 13 +++++--------
 tools/i2ctransfer.8 |  2 +-
 tools/i2ctransfer.c | 13 +++++--------
 12 files changed, 82 insertions(+), 67 deletions(-)
---
base-commit: 5852f5375eea6ca9dabf31f4772cb8b8ecc905d8
change-id: 20260530-accept-device-path-539164c9c1df

Best regards,
--  
Brigham Campbell <me@brighamcampbell.com>