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regulator: Add devm_regulator_get() 

Add a resource managed regulator_get() to simplify regulator
usage in drivers. This allows driver authors to "get and forget"
about their regulators by automatically calling regulator_put()
when the driver is detached.

[Fixed up a couple of coding style issues -- broonie]

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Boyd 2012-01-16 19:39:58 -08:00 committed by Mark Brown
parent dcd6c92267
commit 070b907922
3 changed files with 46 additions and 0 deletions
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3
Documentation/driver-model/devres.txt
View File

@ -267,3 +267,6 @@ IOMAP
pcim_iounmap()
pcim_iomap_table() : array of mapped addresses indexed by BAR
pcim_iomap_regions() : do request_region() and iomap() on multiple BARs
REGULATOR
devm_regulator_get()

34
drivers/regulator/core.c
View File

@ -1320,6 +1320,40 @@ struct regulator *regulator_get(struct device *dev, const char *id)
}
EXPORT_SYMBOL_GPL(regulator_get);
static void devm_regulator_release(struct device *dev, void *res)
{
regulator_put(*(struct regulator **)res);
}
/**
* devm_regulator_get - Resource managed regulator_get()
* @dev: device for regulator "consumer"
* @id: Supply name or regulator ID.
*
* Managed regulator_get(). Regulators returned from this function are
* automatically regulator_put() on driver detach. See regulator_get() for more
* information.
*/
struct regulator *devm_regulator_get(struct device *dev, const char *id)
{
struct regulator **ptr, *regulator;
ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
regulator = regulator_get(dev, id);
if (!IS_ERR(regulator)) {
*ptr = regulator;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return regulator;
}
EXPORT_SYMBOL_GPL(devm_regulator_get);
/**
* regulator_get_exclusive - obtain exclusive access to a regulator.
* @dev: device for regulator "consumer"

9
include/linux/regulator/consumer.h
View File

@ -132,6 +132,8 @@ struct regulator_bulk_data {
/* regulator get and put */
struct regulator *__must_check regulator_get(struct device *dev,
const char *id);
struct regulator *__must_check devm_regulator_get(struct device *dev,
const char *id);
struct regulator *__must_check regulator_get_exclusive(struct device *dev,
const char *id);
void regulator_put(struct regulator *regulator);
@ -200,6 +202,13 @@ static inline struct regulator *__must_check regulator_get(struct device *dev,
*/
return NULL;
}
static inline struct regulator *__must_check
devm_regulator_get(struct device *dev, const char *id)
{
return NULL;
}
static inline void regulator_put(struct regulator *regulator)
{
}