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regulator: Add notifier event on regulator disable

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The intended use case is for drivers which disable regulators to save
power but need to do some work to restore the hardware state when
restarting.  If the supplies are not actually disabled due to board
limits or sharing with other active devices this notifier allows the
driver to avoid unneeded reinitialisation, particularly when used with
runtime PM.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-12-01 21:12:27 +00:00 committed by Liam Girdwood
parent 6faa7e0a4b
commit 84b6826306
2 changed files with 8 additions and 3 deletions
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7
drivers/regulator/core.c
View File

@ -1341,6 +1341,9 @@ static int _regulator_disable(struct regulator_dev *rdev)
__func__, rdev_get_name(rdev));
return ret;
}
_notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
NULL);
}
/* decrease our supplies ref count and disable if required */
@ -1399,8 +1402,8 @@ static int _regulator_force_disable(struct regulator_dev *rdev)
return ret;
}
/* notify other consumers that power has been forced off */
_notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
NULL);
_notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
REGULATOR_EVENT_DISABLE, NULL);
}
/* decrease our supplies ref count and disable if required */

4
include/linux/regulator/consumer.h
View File

@ -89,8 +89,9 @@
* REGULATION_OUT Regulator output is out of regulation.
* FAIL Regulator output has failed.
* OVER_TEMP Regulator over temp.
* FORCE_DISABLE Regulator shut down by software.
* FORCE_DISABLE Regulator forcibly shut down by software.
* VOLTAGE_CHANGE Regulator voltage changed.
* DISABLE Regulator was disabled.
*
* NOTE: These events can be OR'ed together when passed into handler.
*/
@ -102,6 +103,7 @@
#define REGULATOR_EVENT_OVER_TEMP 0x10
#define REGULATOR_EVENT_FORCE_DISABLE 0x20
#define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40
#define REGULATOR_EVENT_DISABLE 0x80
struct regulator;