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An ATR is a device that looks similar to an i2c-mux: it has an I2C slave "upstream" port and N master "downstream" ports, and forwards transactions from upstream to the appropriate downstream port. But it is different in that the forwarded transaction has a different slave address. The address used on the upstream bus is called the "alias" and is (potentially) different from the physical slave address of the downstream chip. Add a helper file (just like i2c-mux.c for a mux or switch) to allow implementing ATR features in a device driver. The helper takes care of adapter creation/destruction and translates addresses at each transaction. Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
75 lines
957 B
ReStructuredText
75 lines
957 B
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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===================
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I2C/SMBus Subsystem
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===================
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Introduction
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============
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.. toctree::
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:maxdepth: 1
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summary
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i2c-protocol
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smbus-protocol
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instantiating-devices
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busses/index
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i2c-topology
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muxes/i2c-mux-gpio
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i2c-sysfs
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i2c-address-translators
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Writing device drivers
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======================
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.. toctree::
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:maxdepth: 1
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writing-clients
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dev-interface
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dma-considerations
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fault-codes
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functionality
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Debugging
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=========
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.. toctree::
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:maxdepth: 1
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gpio-fault-injection
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i2c-stub
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Slave I2C
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=========
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.. toctree::
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:maxdepth: 1
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slave-interface
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slave-eeprom-backend
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slave-testunit-backend
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Advanced topics
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===============
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.. toctree::
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:maxdepth: 1
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ten-bit-addresses
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Legacy documentation
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====================
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.. toctree::
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:maxdepth: 1
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old-module-parameters
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.. only:: subproject and html
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Indices
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=======
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* :ref:`genindex`
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