On Fri, Dec 17, 2010 at 02:49:25PM +0100, Rafael J. Wysocki wrote:
> On Friday, December 17, 2010, Mark Brown wrote:
> > By, for example, providing default implementations which the buses can
> > use if they choose to.
> OK, so we have generic_subsys_pm_ops. Do we need anything beyond that?
Hrm. Possibly just some fiddling with those or alternative versions.
For example, looking at the I2C bus suspend it's this:
static int i2c_device_pm_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (pm) {
if (pm_runtime_suspended(dev))
return 0;
else
return pm->suspend ? pm->suspend(dev) : 0;
}
return i2c_legacy_suspend(dev, PMSG_SUSPEND);
}
Ideally the if (pm) block could just be factored out into the pm core as
there's nothing I2C-specific about that at all. Possibly even the whole
logic surrounding fall back to legacy, though that smells a bit. The
generic suspend operation doesn't fit here:
int pm_generic_suspend(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND);
}
EXPORT_SYMBOL_GPL(pm_generic_suspend);
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