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WSBELL(9)                  Kernel Developer's Manual                 WSBELL(9)

NAME
     wsbell, wsbelldevprint - wscons system bell support

SYNOPSIS
     #include <dev/wscons/wsconsio.h>
     #include <dev/wscons/wsbellvar.h>

     int
     wsbelldevprint(void *aux, const char *pnp);

DESCRIPTION
     The wsbell module is a component of the wscons(9) framework, providing
     keyboard-independent bell support.  All of the support is provided by the
     wsbell(4) device driver, which must be a child of the hardware device
     driver.  The only hardware device drivers that can provide a wsbell
     facility are speaker(4) devices.

DATA TYPES
     Speaker drivers providing support for wscons bell devices will make use
     of the following data types:

     struct wsbelldev_attach_args
              A structure used to attach the wsbell(4) child device.  It has
              the following members:

                      void *accesscookie;

FUNCTIONS
     wsbelldevprint(aux, pnp)
              The default wsbell printing routine used by config_found().
              (see autoconf(9)).

AUTOCONFIGURATION
     Speaker drivers which want to use the wsbell module must be a parent to
     the wsbell(4) device and provide an attachment interface.  To attach the
     wsbell(4) device, the speaker driver must allocate and populate a
     wsbelldev_attach_args structure with a pointer to the parent's device
     structure as an access cookie and call config_found() to perform the
     attach (see autoconf(9)).

OPERATION
     When a bell event is received on a wsdisplay(4) device the system bell is
     sounded.

CODE REFERENCES
     The wscons subsystem is implemented within the directory sys/dev/wscons.
     The wsbell module itself is implement within the file
     sys/dev/wscons/wsbell.c.  ioctl(2) operations are listed in
     sys/dev/wscons/wsconsio.h.

SEE ALSO
     ioctl(2), wsbell(4), wscons(4), wskbd(4), autoconf(9), driver(9),
     intro(9), wscons(9), wsdisplay(9), wskbd(9)

NetBSD 8.99.34                   June 30, 2017                  NetBSD 8.99.34