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Regulator: add suspend-finish API for regulator core. 

The regulator core had suspend-prepare that turns off the regulators
when entering a system-wide suspend. However, it did not have
suspend-finish that pairs with suspend-prepare and the regulator core
has assumed that the regulator devices and their drivers support
autonomous recover at resume.

This patch adds regulator_suspend_finish that pairs with the
previously-existed regulator_suspend_prepare. The function
regulator_suspend_finish turns on the regulators that have always_on set
or positive use_count so that we can reset the regulator states
appropriately at resume.

In regulator_suspend_finish, if has_full_constraints, it disables
unnecessary regulators.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
--
Updates
v3
	comments corrected (Thanks to Igor)
v2
	disable unnecessary regulators (Thanks to Mark)
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
MyungJoo Ham 2011-03-11 10:13:59 +09:00 committed by Liam Girdwood
parent fb7c18cac8
commit 7a32b589a9
2 changed files with 42 additions and 0 deletions
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41
drivers/regulator/core.c
View File

@ -2655,6 +2655,47 @@ int regulator_suspend_prepare(suspend_state_t state)
}
EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
/**
* regulator_suspend_finish - resume regulators from system wide suspend
*
* Turn on regulators that might be turned off by regulator_suspend_prepare
* and that should be turned on according to the regulators properties.
*/
int regulator_suspend_finish(void)
{
struct regulator_dev *rdev;
int ret = 0, error;
mutex_lock(&regulator_list_mutex);
list_for_each_entry(rdev, &regulator_list, list) {
struct regulator_ops *ops = rdev->desc->ops;
mutex_lock(&rdev->mutex);
if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
ops->enable) {
error = ops->enable(rdev);
if (error)
ret = error;
} else {
if (!has_full_constraints)
goto unlock;
if (!ops->disable)
goto unlock;
if (ops->is_enabled && !ops->is_enabled(rdev))
goto unlock;
error = ops->disable(rdev);
if (error)
ret = error;
}
unlock:
mutex_unlock(&rdev->mutex);
}
mutex_unlock(&regulator_list_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_suspend_finish);
/**
* regulator_has_full_constraints - the system has fully specified constraints
*

1
include/linux/regulator/machine.h
View File

@ -186,6 +186,7 @@ struct regulator_init_data {
};
int regulator_suspend_prepare(suspend_state_t state);
int regulator_suspend_finish(void);
#ifdef CONFIG_REGULATOR
void regulator_has_full_constraints(void);