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When doing a single register write we use work_buf for both the register
and the value with the buffer formatted for sending directly to the device
so we can just do a write() directly. This saves allocating a temporary
buffer if we can't do gather writes and is likely to be faster than doing
a gather write.
Signed-off-by: Mark Brown <[email protected]>
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This is currently unused but we need to know which registers exist and
their properties in order to implement diagnostics like register map
dumps and the cache features.
We use callbacks partly because properties can vary at runtime (eg, through
access locks on registers) and partly because big switch statements are a
good compromise between readable code and small data size for providing
information on big register maps.
Signed-off-by: Mark Brown <[email protected]>
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We should be reading the number of bytes we were asked for, not the size
of a single register.
Signed-off-by: Mark Brown <[email protected]>
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Signed-off-by: Mark Brown <[email protected]>
Acked-by: Liam Girdwood <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Acked-by: Grant Likely <[email protected]>
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Signed-off-by: Mark Brown <[email protected]>
Acked-by: Liam Girdwood <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Acked-by: Grant Likely <[email protected]>
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There are many places in the tree where we implement register access for
devices on non-memory mapped buses, especially I2C and SPI. Since hardware
designers seem to have settled on a relatively consistent set of register
interfaces this can be effectively factored out into shared code. There
are a standard set of formats for marshalling data for exchange with the
device, with the actual I/O mechanisms generally being simple byte
streams.
We create an abstraction for marshaling data into formats which can be
sent on the control interfaces, and create a standard method for
plugging in actual transport underneath that.
This is mostly a refactoring and renaming of the bottom level of the
existing code for sharing register I/O which we have in ASoC. A
subsequent patch in this series converts ASoC to use this. The main
difference in interface is that reads return values by writing to a
location provided by a pointer rather than in the return value, ensuring
we can use the full range of the type for register data. We also use
unsigned types rather than ints for the same reason.
As some of the devices can have very large register maps the existing
ASoC code also contains infrastructure for managing register caches.
This cache work will be moved over in a future stage to allow for
separate review, the current patch only deals with the physical I/O.
Signed-off-by: Mark Brown <[email protected]>
Acked-by: Liam Girdwood <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Acked-by: Grant Likely <[email protected]>
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