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a67cd5482f
Move pcmcia crc32hash tool from Documentation to tools/pcmcia and remove it from Documentation Makefile. Update location information for this tool. Create a new Makefile to build pcmcia. It can be built from top level directory or from pcmcia directory: Run make -C tools/pcmcia or cd tools/pcmcia; make Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
34 lines
1.3 KiB
Plaintext
34 lines
1.3 KiB
Plaintext
Matching of PCMCIA devices to drivers is done using one or more of the
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following criteria:
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- manufactor ID
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- card ID
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- product ID strings _and_ hashes of these strings
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- function ID
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- device function (actual and pseudo)
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You should use the helpers in include/pcmcia/device_id.h for generating the
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struct pcmcia_device_id[] entries which match devices to drivers.
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If you want to match product ID strings, you also need to pass the crc32
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hashes of the string to the macro, e.g. if you want to match the product ID
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string 1, you need to use
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PCMCIA_DEVICE_PROD_ID1("some_string", 0x(hash_of_some_string)),
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If the hash is incorrect, the kernel will inform you about this in "dmesg"
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upon module initialization, and tell you of the correct hash.
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You can determine the hash of the product ID strings by catting the file
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"modalias" in the sysfs directory of the PCMCIA device. It generates a string
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in the following form:
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pcmcia:m0149cC1ABf06pfn00fn00pa725B842DpbF1EFEE84pc0877B627pd00000000
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The hex value after "pa" is the hash of product ID string 1, after "pb" for
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string 2 and so on.
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Alternatively, you can use crc32hash (see tools/pcmcia/crc32hash.c)
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to determine the crc32 hash. Simply pass the string you want to evaluate
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as argument to this program, e.g.:
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$ tools/pcmcia/crc32hash "Dual Speed"
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