Linux Device Drivers

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ddi_dev_is_sid

ddi_dev_is_sid(9F)					   Kernel Functions for Drivers 					ddi_dev_is_sid(9F)

NAME

       ddi_dev_is_sid - tell whether a device is self-identifying

SYNOPSIS

       #include <sys/conf.h>
       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       int ddi_dev_is_sid(dev_info_t *dip);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       dip	       A pointer to the device's dev_info structure.

DESCRIPTION

       ddi_dev_is_sid()  tells	the  caller whether the device described by dip is self-identifying, that is, a device that can unequivocally tell
       the system that it exists. This is useful for drivers that support both a self-identifying as well as a non-self-identifying variants of  a
       device (and therefore must be probed).

RETURN VALUES

       DDI_SUCCESS     Device is self-identifying.

       DDI_FAILURE     Device is not self-identifying.

CONTEXT

       ddi_dev_is_sid() can be called from user or interrupt context.

EXAMPLES

	1  ...
	2  int
	3  bz_probe(dev_info_t *dip)
	4  {
	5   ...
	6   if (ddi_dev_is_sid(dip) == DDI_SUCCESS) {
	7	 /*
	8	  * This is the self-identifying version (OpenBoot).
	9	  * No need to probe for it because we know it is there.
       10	  * The existence of dip && ddi_dev_is_sid() proves this.
       11	  */
       12	      return (DDI_PROBE_DONTCARE);
       13   }
       14   /*
       15    * Not a self-identifying variant of the device. Now we have to
       16    * do some work to see whether it is really attached to the
       17    * system.
       18    */
       19  ...

SEE ALSO

       probe(9E) Writing Device Drivers

SunOS 5.10							    24 Oct 1991 						ddi_dev_is_sid(9F)

Programming