SND_POWER_WAIT(9) Management of Cards and Device SND_POWER_WAIT(9)NAME
snd_power_wait - wait until the power-state is changed.
int snd_power_wait(struct snd_card * card, unsigned int power_state);
expected power state
Waits until the power-state is changed.
Zero if successful, or a negative error code.
the power lock must be active before call.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SND_POWER_WAIT(9)
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power(9E) Driver Entry Points power(9E)NAME
power - power a device attached to the system
int prefixpower(dev_info_t *dip, int component, int 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.
dip Pointer to the device's dev_info structure.
component Component of the driver to be managed.
level Desired component power level.
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.
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.
The power() function is called from user or kernel context only.
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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