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IIO: hw_consumer: add devm_iio_hw_consumer_alloc 

Add devm_iio_hw_consumer_alloc function that calls iio_hw_consumer_free
when the device is unbound from the bus.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Arnaud Pouliquen 2018-01-10 11:13:05 +01:00 committed by Mark Brown
parent 5b178943d6
commit b688c18d30
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GPG Key ID: 24D68B725D5487D0
2 changed files with 68 additions and 0 deletions
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66
drivers/iio/buffer/industrialio-hw-consumer.c
View File

@ -137,6 +137,72 @@ void iio_hw_consumer_free(struct iio_hw_consumer *hwc)
}
EXPORT_SYMBOL_GPL(iio_hw_consumer_free);
static void devm_iio_hw_consumer_release(struct device *dev, void *res)
{
iio_hw_consumer_free(*(struct iio_hw_consumer **)res);
}
static int devm_iio_hw_consumer_match(struct device *dev, void *res, void *data)
{
struct iio_hw_consumer **r = res;
if (!r || !*r) {
WARN_ON(!r || !*r);
return 0;
}
return *r == data;
}
/**
* devm_iio_hw_consumer_alloc - Resource-managed iio_hw_consumer_alloc()
* @dev: Pointer to consumer device.
*
* Managed iio_hw_consumer_alloc. iio_hw_consumer allocated with this function
* is automatically freed on driver detach.
*
* If an iio_hw_consumer allocated with this function needs to be freed
* separately, devm_iio_hw_consumer_free() must be used.
*
* returns pointer to allocated iio_hw_consumer on success, NULL on failure.
*/
struct iio_hw_consumer *devm_iio_hw_consumer_alloc(struct device *dev)
{
struct iio_hw_consumer **ptr, *iio_hwc;
ptr = devres_alloc(devm_iio_hw_consumer_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return NULL;
iio_hwc = iio_hw_consumer_alloc(dev);
if (IS_ERR(iio_hwc)) {
devres_free(ptr);
} else {
*ptr = iio_hwc;
devres_add(dev, ptr);
}
return iio_hwc;
}
EXPORT_SYMBOL_GPL(devm_iio_hw_consumer_alloc);
/**
* devm_iio_hw_consumer_free - Resource-managed iio_hw_consumer_free()
* @dev: Pointer to consumer device.
* @hwc: iio_hw_consumer to free.
*
* Free iio_hw_consumer allocated with devm_iio_hw_consumer_alloc().
*/
void devm_iio_hw_consumer_free(struct device *dev, struct iio_hw_consumer *hwc)
{
int rc;
rc = devres_release(dev, devm_iio_hw_consumer_release,
devm_iio_hw_consumer_match, hwc);
WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_iio_hw_consumer_free);
/**
* iio_hw_consumer_enable() - Enable IIO hardware consumer
* @hwc: iio_hw_consumer to enable.

2
include/linux/iio/hw-consumer.h
View File

@ -13,6 +13,8 @@ struct iio_hw_consumer;
struct iio_hw_consumer *iio_hw_consumer_alloc(struct device *dev);
void iio_hw_consumer_free(struct iio_hw_consumer *hwc);
struct iio_hw_consumer *devm_iio_hw_consumer_alloc(struct device *dev);
void devm_iio_hw_consumer_free(struct device *dev, struct iio_hw_consumer *hwc);
int iio_hw_consumer_enable(struct iio_hw_consumer *hwc);
void iio_hw_consumer_disable(struct iio_hw_consumer *hwc);