no-involuntary-power-cycles man page on SmartOS

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

       A device that might be damaged by power cycles should export the	 bool‐
       ean  (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 sus‐
       pend 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.

       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:


       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;

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

       │Interface stability │ Committed	      │

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

       Writing Device Drivers


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