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regulator: core: Support setting suspend_[mode|voltage] if set_suspend_[en|dis]able is NULL 

In current implementation, to support set_suspend_voltage and set_suspend_mode
the regulator code needs the regulator driver to implement both
set_suspend_enable and set_suspend_disable callbacks.

This patch removes this limitation. In the case set_suspend_enable and/or
set_suspend_disable are NULL, the regulator code assumes we don't need to
do any thing to enable/disable regulator when system is suspended and
then will continue to handle set_suspend_mode and set_suspend_voltage.

Currently the regulator core creates suspend state related sysfs entries only
if both set_suspend_enable and set_suspend_disable callbacks are not NULL.
A side-effect of this change is that the regulator core will create suspend
state related sysfs entries unconditionally now.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2012-04-14 09:14:34 +08:00 committed by Mark Brown
parent 3f24f5ada6
commit 8ac0e95d64
1 changed files with 9 additions and 18 deletions
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27
drivers/regulator/core.c
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@ -673,17 +673,14 @@ static int suspend_set_state(struct regulator_dev *rdev,
struct regulator_state *rstate)
{
int ret = 0;
bool can_set_state;
can_set_state = rdev->desc->ops->set_suspend_enable &&
rdev->desc->ops->set_suspend_disable;
/* If we have no suspend mode configration don't set anything;
* only warn if the driver actually makes the suspend mode
* configurable.
* only warn if the driver implements set_suspend_voltage or
* set_suspend_mode callback.
*/
if (!rstate->enabled && !rstate->disabled) {
if (can_set_state)
if (rdev->desc->ops->set_suspend_voltage ||
rdev->desc->ops->set_suspend_mode)
rdev_warn(rdev, "No configuration\n");
return 0;
}
@ -693,15 +690,13 @@ static int suspend_set_state(struct regulator_dev *rdev,
return -EINVAL;
}
if (!can_set_state) {
rdev_err(rdev, "no way to set suspend state\n");
return -EINVAL;
}
if (rstate->enabled)
if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
ret = rdev->desc->ops->set_suspend_enable(rdev);
else
else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
ret = rdev->desc->ops->set_suspend_disable(rdev);
else /* OK if set_suspend_enable or set_suspend_disable is NULL */
ret = 0;
if (ret < 0) {
rdev_err(rdev, "failed to enabled/disable\n");
return ret;
@ -2776,10 +2771,6 @@ static int add_regulator_attributes(struct regulator_dev *rdev)
return status;
}
/* suspend mode constraints need multiple supporting methods */
if (!(ops->set_suspend_enable && ops->set_suspend_disable))
return status;
status = device_create_file(dev, &dev_attr_suspend_standby_state);
if (status < 0)
return status;