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snd_jack_set_key(9) - phpMan

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SND_JACK_SET_KEY(9)                  Miscellaneous Functions                  SND_JACK_SET_KEY(9)

       snd_jack_set_key - Set a key mapping on a jack

       int snd_jack_set_key(struct snd_jack * jack, enum snd_jack_types type, int keytype);

           The jack to configure

           Jack report type for this key

           Input layer key type to be reported

       Map a SND_JACK_BTN_ button type to an input layer key, allowing reporting of keys on
       accessories via the jack abstraction. If no mapping is provided but keys are enabled in
       the jack type then BTN_n numeric buttons will be reported.

       If jacks are not reporting via the input API this call will have no effect.

       Note that this is intended to be use by simple devices with small numbers of keys that can
       be reported. It is also possible to access the input device directly - devices with
       complex input capabilities on accessories should consider doing this rather than using
       this abstraction.

       This function may only be called prior to registration of the jack.

       Zero if successful, or a negative error code on failure.

Kernel Hackers Manual 4.8.                 January 2017                       SND_JACK_SET_KEY(9)

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