[Bug 189914] i2c(8) utility does not work on Raspberry Pi

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed May 22 21:06:41 UTC 2019


--- Comment #13 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ian
Date: Wed May 22 21:06:10 UTC 2019
New revision: 348120
URL: https://svnweb.freebsd.org/changeset/base/348120

  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


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