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getinfo(9e)
getinfo(9E) Driver Entry Points getinfo(9E)
NAME
getinfo - get device driver information
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
int prefixgetinfo(dev_info_t *dip, ddi_info_cmd_t cmd,
void *arg, void **resultp);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). This entry point is required for
drivers which export cb_ops(9S) entry points.
ARGUMENTS
dip Do not use.
cmd Command argument - valid command values are
DDI_INFO_DEVT2DEVINFO and DDI_INFO_DEVT2INSTANCE.
arg Command specific argument.
resultp Pointer to where the requested information is stored.
DESCRIPTION
When cmd is set to DDI_INFO_DEVT2DEVINFO, getinfo() should return the
dev_info_t pointer associated with the dev_t arg. The dev_info_t
pointer should be returned in the field pointed to by resultp.
When cmd is set to DDI_INFO_DEVT2INSTANCE, getinfo() should return the
instance number associated with the dev_t arg. The instance number
should be returned in the field pointed to by resultp.
Drivers which do not export cb_ops(9S) entry points are not required to
provide a getinfo() entry point, and may use nodev(9F) in the devo_get‐
info field of the dev_ops(9S) structure. A SCSI HBA driver is an exam‐
ple of a driver which is not required to provide cb_ops(9S) entry
points.
RETURN VALUES
getinfo() should return:
DDI_SUCCESS on success.
DDI_FAILURE on failure.
EXAMPLES
Example 1 getinfo() implementation
/*ARGSUSED*/
static int
rd_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, \
void **resultp)
{
/* Note that in this simple example
* the minor number is the instance
* number. */
devstate_t *sp;
int error = DDI_FAILURE;
switch (infocmd) {
case DDI_INFO_DEVT2DEVINFO:
if ((sp = ddi_get_soft_state(statep,
getminor((dev_t) arg))) != NULL) {
*resultp = sp->devi;
error = DDI_SUCCESS;
} else
*result = NULL;
break;
case DDI_INFO_DEVT2INSTANCE:
*resultp = (void *) (uintptr_t) getminor((dev_t) arg);
error = DDI_SUCCESS;
break;
}
return (error);
}
SEE ALSO
ddi_no_info(9F), nodev(9F), cb_ops(9S), dev_ops(9S)
Writing Device Drivers in Oracle Solaris 11.4
NOTES
Non-gld(4D)-based DLPI network streams drivers are encouraged to switch
to gld(4D). Failing this, a driver that creates DLPI style-2 minor
nodes must specify CLONE_DEV for its style-2 ddi_create_minor_node(9F)
nodes and use qassociate(9F). A driver that supports both style-1 and
style-2 minor nodes should return DDI_FAILURE for
DDI_INFO_DEVT2INSTANCE and DDI_INFO_DEVT2DEVINFO getinfo() calls to
style-2 minor nodes. (The correct association is already established by
qassociate(9F)). A driver that only supports style-2 minor nodes can
use ddi_no_info(9F) for its getinfo() implementation. For drivers that
do not follow these rules, the results of a modunload(8) of the driver
or a cfgadm(8) remove of hardware controlled by the driver are unde‐
fined.
Oracle Solaris 11.4 16 Jan 2008 getinfo(9E)