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d29693bf10
Expose example and tool source files in the Documentation/ directory in their own files instead of being buried (almost hidden) in readme/txt files. This will make them more visible/usable to users who may need to use them, to developers who may need to test with them, and to janitors who would update them if they were more visible. Also, if any of these possibly should not be in the kernel tree at all, it will be clearer that they are here and we can discuss if they should be removed. Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
33 lines
1.3 KiB
Text
33 lines
1.3 KiB
Text
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 Documentation/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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$ ./crc32hash "Dual Speed"
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