centos man page for snd_jack_set_key

SND_JACK_SET_KEY(9)					      Miscellaneous Functions					       SND_JACK_SET_KEY(9)

NAME
       snd_jack_set_key - Set a key mapping on a jack

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

ARGUMENTS
       jack
	   The jack to configure

       type
	   Jack report type for this key

       keytype
	   Input layer key type to be reported

DESCRIPTION
       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.

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

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       SND_JACK_SET_KEY(9)