Tribblix: manual page: ddi_dev_is

DDI_DEV_IS_SID(9F) Kernel Functions for Drivers DDI_DEV_IS_SID(9F)

NAME

ddi_dev_is_sid - tell whether a device is self-identifying

SYNOPSIS

#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

int ddi_dev_is_sid(dev_info_t *dip);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

dip
A pointer to the device's dev_info structure.

DESCRIPTION

The ddi_dev_is_sid() function tells the caller whether the device
described by dip is self-identifying, that is, a device that can
unequivocally tell the system that it exists. This is useful for
drivers that support both a self-identifying as well as non-self-
identifying variants of a device (and therefore must be probed).

RETURN VALUES

DDI_SUCCESS
Device is self-identifying.

DDI_FAILURE
Device is not self-identifying.

CONTEXT

The ddi_dev_is_sid() function can be called from user, interrupt, or
kernel context.

EXAMPLES

1 ...
2 int
3 bz_probe(dev_info_t *dip)
4 {
5 ...
6 if (ddi_dev_is_sid(dip) == DDI_SUCCESS) {
7 /*
8 * This is the self-identifying version (OpenBoot).
9 * No need to probe for it because we know it is there.
10 * The existence of dip && ddi_dev_is_sid() proves this.
11 */
12 return (DDI_PROBE_DONTCARE);
13 }
14 /*
15 * Not a self-identifying variant of the device. Now we have to
16 * do some work to see whether it is really attached to the
17 * system.
18 */
19 ...