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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);
}

See Also

nodev(9F) , cb_ops(9S) , dev_ops(9S)

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