Copyright (c) 2004, Sun Microsystems, Inc.
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#include <sys/ddi.h> #include <sys/sunddi.h> int prefixgetinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp);
Solaris DDI specific (Solaris DDI). This entry point is required for drivers which export cb_ops(9S) entry points.
Do not use.
Command argument - valid command values are DDI_INFO_DEVT2DEVINFO and DDI_INFO_DEVT2INSTANCE.
Command specific argument.
Pointer to where the requested information is stored.
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_getinfo field of the dev_ops(9S) structure. A SCSI HBA driver is an example of a driver which is not required to provide cb_ops(9S) entry points.
getinfo() should return: DDI_SUCCESS
on success.
on failure.
Example 1 getinfo() implementation
/*ARGSUSED*/
static int
rd_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, \e
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);
}
ddi_no_info(9F), nodev(9F), cb_ops(9S), dev_ops(9S)
Writing Device Drivers
Non-gld(7D)-based DLPI network streams drivers are encouraged to switch to gld(7D). 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(1M) of the driver or a cfgadm(1M) remove of hardware controlled by the driver are undefined.