speakup: document the usage of enum values
The cursor tracking modes enum, the edge enum, and the read_all commands enum should be used as such in the source code, to make it more readable and make gcc catch missing values in switches. Also, some values of enums are coupled with others, we at least need to document these. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Link: https://lore.kernel.org/r/20201102095945.ap4pdff2dn47hijh@function Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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