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snd_power_wait(9) [centos man page]

SND_POWER_WAIT(9)					  Management of Cards and Device					 SND_POWER_WAIT(9)

NAME
snd_power_wait - wait until the power-state is changed. SYNOPSIS
int snd_power_wait(struct snd_card * card, unsigned int power_state); ARGUMENTS
card soundcard structure power_state expected power state DESCRIPTION
Waits until the power-state is changed. RETURN
Zero if successful, or a negative error code. NOTE
the power lock must be active before call. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SND_POWER_WAIT(9)

Check Out this Related Man Page

power(9E)							Driver Entry Points							 power(9E)

NAME
power - power a device attached to the system SYNOPSIS
#include <sys/ddi.h> #include <sys/sunddi.h> int prefixpower(dev_info_t *dip, int component, int level); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). This entry point is required. If the driver writer does not supply this entry point, the value NULL must be used in the cb_ops(9S) structure instead. PARAMETERS
dip Pointer to the device's dev_info structure. component Component of the driver to be managed. level Desired component power level. DESCRIPTION
The power(9E) function is the device-specific Power Management entry point. This function is called when the system wants the driver to set the power level of component to level. The level argument is the driver-defined power level to which the component needs to be set. Except for power level 0, which is interpreted by the framework to mean "powered off," the interpretation of level is entirely up to the driver. The component argument is the component of the device to be power-managed. The interpretation of component is entirely up to the driver. When a requested power transition would cause the device to lose state, the driver must save the state of the device in memory. When a requested power transition requires state to be restored, the driver must restore that state. If a requested power transition for one component requires another component to change power state before it can be completed, the driver must call pm_raise_power(9F) to get the other component changed, and the power(9E) entry point must support being re-entered. If the system requests an inappropriate power transition for the device (for example, a request to power down a device which has just become busy), then the power level should not be changed and power should return DDI_FAILURE. RETURN VALUES
The power() function returns: DDI_SUCCESS Successfully set the power to the requested level. DDI_FAILURE Failed to set the power to the requested level. CONTEXT
The power() function is called from user or kernel context only. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface stability |Committed | +-----------------------------+-----------------------------+ SEE ALSO
attach(9E), detach(9E), pm_busy_component(9F), pm_idle_component(9F), pm_raise_power(9F), cb_ops(9S) Writing Device Drivers Using Power Management SunOS 5.11 12 Dec 2003 power(9E)
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