we need to add "_input" to get the correct sysfs file name. This is
much faster. This is still a ugly hack I'd like to get rid of, but at
least now the slowdown is acceptable.
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sensors_bus_id. This prevents wasting space with padding on 64-bit
systems, saving some memory (128 bytes for sensors_bus_id, nothing
yet for sensors_feature_data but it will come later).
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MAX_SUB_FEATURES in the process.) This value could change in the
future so it's not safe to make it part of the libsensors API.
And it isn't needed either, applications shouldn't need to use
this value.
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caller select which subset of chips it wants. This is slightly better
size-wise than letting all applications do the filtering by themselves.
This will change the way the command line parameters of "sensors" are
interpreted. Beforehand, the chips were always returned in the order
in which they were listed by the library. Also, each chip could be listed
only once. From now on, the chips will be listed in the order in which
they are passed on the command line, which I think makes more sense. A
side effect is that chips can be listed more than once, if that's what
the user asks for. Not very useful though.
This change makes it possible to make sensors_match_chip() internal
to the library. Filtering the list of chips returned by
sensors_get_detected_chips() was the last known external use for this
function.
This patch looks much bigger than it really is, but the largest part is
really only code reindentation.
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Instead, the application will have to call sensors_exit() explicitly
before calling sensors_init() again. Most applications don't offer
any way to reload the configuration file, so better optimize for the
initial load.
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SPI bus statements in the configuration file are not yet supported, as
SPI buses don't have a name attribute yet, it's not possible to identify
them and thus no substitution is possible.
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i2c-centric. Make it more neutral so that we can cleanly support
additional bus types such as SPI or One-Wire.
This second part updates sensors_bus to use sensors_bus_id. Thanks
to Mark M. Hoffman for showing me how the configuration file
parser could be modified to support that change.
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i2c-centric. Make it more neutral so that we can cleanly support
additional bus types such as SPI or One-Wire.
This first part introduces sensors_bus_id, and updates
sensors_chip_name to use it.
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rewrite sensors_parse_chip_name() with a simpler algorithm. The new
code is smaller by about one third, and twice as fast on average
(5 times as fast in the most frequent case "foo-*".)
This closes ticket #2221.
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sensors_parse_chip_name(). sensors_snprintf_chip_name() converts
a chip name from its internal representation to a human readable
string. So far, each user program had to reimplement this function.
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its prototype to suit our needs better.
* Pass the chip name by address.
* Pass the feature directly rather than its number.
* Switch to a sane convention for the returned value.
* Don't check for errors that can't happen.
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delegating the task to the user applications.
For now, I am calling sensors_get_ignored() in
sensors_get_all_features(), because this is the least intrusive way.
This is in no way optimal though, it would be better to not add
ignored features to the feature list in the first place. However,
doing so would require that the configuration file is read before
sysfs is scanned for features, which isn't currently the case. So
this improvement is left for later.
Note that this patch adds a small cost in terms of performance. This
is because we now honor ignore statements on all features (main ones
and subfeatures) while in practice "sensors" was only checking for
main features. It would be trivial to stop checking for subfeatures,
but it seems to me that supporting ignore on subfeatures is a good
move, as the user may actually want to ignore a specific subfeature.
Individual alarms come to mind. This will also be handy to debug the
generic print code in "sensors".
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immediately follow their main feature. This makes it possible to simplify
sensors_get_all_features() quite a bit. We no longer need to maintain
separate pointers for the last main feature and the last subfeature,
we can simply walk the list linearly.
Note that I am still not entirely happy with this API. It was obviously
designed for debugging purposes (sensors -u) and without performance
concernes nor interface cleanliness in mind. I believe that we want to
tag main features and subfeatures as such, and let the application ask
specifically for the list of main features, and for each feature, for
its list of subfeatures (i.e. two functions instead of one.)
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* We no longer support any single type, so no need to handle this case.
* We can start looking for "_" at offset 3 rather than the beginning
of the string (the shortest valid prefix is "in0", 3 characters.)
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adjust it to fit our needs better:
* Call sensors_feature_get_type() before allocating memory for the
feature name. The allocation will be reverted for all sysfs files
which are not valid libsensors attributes, and there can be a lot
of these. So this saves a few memory allocations. But this means
that we want to pass a simple string to sensors_feature_get_type()
rather than a struct sensors_feature_data. This also means that
sensors_feature_get_type() gets the raw attribute name ("_input"
not stripped.)
* Get the channel number from sensors_feature_get_type() too. We
get it for free from sscanf(), so it's more efficient to return it
than to parse it again in sensors_read_dynamic_chip().
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first called during the library initialization to generate the feature
tables. Then it is called again by sensors itself. This is because we
do not store the result the first time. I propose that we add a type
field to struct sensors_feature_data, where libsensors would store
the result of sensors_feature_get_type(). That way, the application
can get the information without calling sensors_feature_get_type()
again.
This change has the following benefits:
* Obviously, a small speed-up.
* sensors_feature_get_type() can be removed from the public interface.
This means that we can turn it into something that fits the
libsensors needs better, allowing for more optimizations (see next
patches.)
Note: the patch looks bigger that it really is, because I had to move
definitions around in sensors.h.
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Jean Delvare