Provided by:
freebsd-manpages_8.2-1_all 
NAME
device_printf -- formatted output conversion
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
int
device_printf(device_t dev, const char *fmt, ...);
DESCRIPTION
The device_printf() function is a convenience interface to the printf(9)
function. It outputs the name of the dev device, followed by a colon and
a space, and then what printf(9) would print if you passed fmt and the
remaining arguments to it.
RETURN VALUES
The device_printf() function returns the number of characters displayed.
SEE ALSO
printf(3), printf(9)