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Driver Entry Pointsgetinfo(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

 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 *) getminor((dev_t) arg);
          error = DDI_SUCCESS;
          break;
     }

     return (error);
}

SEE ALSO

 

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

Writing Device Drivers

SunOS 5.9Go To TopLast Changed 1 May 1992
 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.