no-involuntary-power-cycles(9p) [sunos man page]

no-involuntary-power-cycles(9P) 			   Kernel Properties for Drivers			   no-involuntary-power-cycles(9P)

NAME

       no-involuntary-power-cycles - device property to prevent involuntary power cycles

DESCRIPTION

       A  device  that might be damaged by power cycles should export the boolean (zero length) property no-involuntary-power-cycles to notify the
       system that all power cycles for the device must be under the control of the device driver.

       The presence of this property prevents power from being removed from a device or any ancestor of the device  while  the	device	driver	is
       detached, unless the device was voluntarily powered off as a result of the device driver calling pm_lower_power(9F).

       The  presence  of  no-involuntary-power-cycles  also forces attachment of the device driver during a CPR suspend operation and prevents the
       suspend from taking place, unless the device driver returns DDI_SUCCESS when its detach(9E) entry point is called with DDI_SUSPEND.

       The presence of no-involuntary-power-cycles does not prevent the system from being powered off due to a halt(1M) or uadmin(1M)  invocation,
       except for CPR suspend.

       This  property  can be exported by a device that is not power manageable, in which case power is not removed from the device or from any of
       its ancestors, even when the driver for the device and the drivers for its ancestors are detached.

EXAMPLES

       Example 1: Use of Property in Driver's Configuration File

       The following is an example of a no-involuntary-power-cycles entry in a driver's .conf file:

       no-involuntary-power-cycles=1;
	    ...

       Example 2: Use of Property in attach() Function

       The following is an example of how the preceding .conf file entry would be implemented in the attach(9E) function of a driver:

       xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd)
	    {
	    ...
		 if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
		     "no-involuntary-power-cycles", NULL, 0) != DDI_PROP_SUCCESS)
		      goto failed;
	    ...
	    }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), pm(7D), attach(9E), detach(9E), ddi_prop_create(9F)

       Writing Device Drivers

SunOS 5.10							    22 Mar 2001 				   no-involuntary-power-cycles(9P)

Check Out this Related Man Page

removable-media(9P)					   Kernel Properties for Drivers				       removable-media(9P)

NAME

       removable-media - removable media device property

DESCRIPTION

       A  device  that	supports  removable  media--such  as CDROM, JAZZ, and ZIP drives--and that supports power management and expects automatic
       mounting of the device via the volume manager should export the boolean (zero length) property removable-media. This property  enables  the
       system to make the power state of the device dependent on the power state of the frame buffer and monitor. See the power.conf(4) discussion
       of the device-dependency-property entry for more information.

       Devices that behave like removable devices (such as PC ATA cards, where the controller and media both are removed at the same time)  should
       also export this property.

EXAMPLES

       Example 1: removable-media Entry

       An example of a removable-media entry from the .conf file of a driver is shown below.

       # This entry keeps removable media from being powered down unless
       # the console framebuffer and monitor are powered down
       #
       removable-media=1;

       Example 2: Implementation in attach()

       Below is an example of how the entry above would be implemented in the attach(9E) function of the driver.

       xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd)
	    {
	    ...
		 if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
		     "removable-media", NULL, 0)) != DDI_PROP_SUCCESS)
		      goto failed;
	    ...
	    }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       power.conf(4), pm(7D), attach(9E), detach(9E), ddi_prop_create(9F)

       Writing Device Drivers

SunOS 5.10							    15 Jun 2001 					       removable-media(9P)

Linux and UNIX Man Pages

no-involuntary-power-cycles(9p) [sunos man page]

Check Out this Related Man Page