This patch set adds to the I2C core the ability to handle multiplexed
I2C bus topologies by presenting each multiplexed segment as a I2C
adapter.
As you can see from the changelog I had to update i2c-core since when
a real adapter (not multiplexer) driver is inserted into the kernel
_after_ an i2c multiplxer one, function i2c_add_adapter() is called
recursively (and the same for i2c_del_adapter() during module removal)
causing a kernel hang due the i2c's "core_lock" mutex.
Changelog
=========
Version 1 -> 2:
---------------
* Fixes a bug related to recursive calls of i2c_(add|del)_adapter()
functions when main adapter is inserted or removed _after_ slave
adapetrs (i2c multiplexers).
This goal has been achieved by:
a) using rwsem instead of mutex for accessing board info data struct,
b) ignoring any active client detaching faults (see relative patch for
further info),
c) removing "core_lock" mutex into adapters (de)registration code.
Rodolfo
--
b/drivers/i2c/Kconfig | 10 +
b/drivers/i2c/Makefile | 3
b/drivers/i2c/i2c-boardinfo.c | 6
b/drivers/i2c/i2c-core.c | 4
b/drivers/i2c/i2c-core.h | 2
b/drivers/i2c/i2c-mux.c | 180 +++++++++++++++++++++++
b/drivers/i2c/muxes/Kconfig | 8 +
b/drivers/i2c/muxes/Makefile | 6
b/drivers/i2c/muxes/pca954x.c | 325 ++++++++++++++++++++++++++++++++++++++++++
b/include/linux/i2c-id.h | 3
b/include/linux/i2c.h | 14 +
b/include/linux/i2c/pca954x.h | 13 +
drivers/i2c/i2c-core.c | 78 ++++------
drivers/i2c/muxes/Kconfig | 9 +
drivers/i2c/muxes/Makefile | 2
15 files changed, 615 insertions(+), 48 deletions(-)
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