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_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.

RETURN VALUES

getinfo() should return:

DDI_SUCCESS
on success.

DDI_FAILURE
on failure.

EXAMPLES

/∗ARGSUSED∗/
static int

rd_getinfo(dev_info_t ∗dip, ddi_info_cmd_t infocmd, void ∗arg, void ∗∗result)

{
/∗ 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 ∗) getminor((dev_t) arg);
                error = DDI_SUCCESS;
                break;
        }
         return (error);
}

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