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author | Arnaud Pouliquen <arnaud.pouliquen@st.com> | 2018-01-10 11:13:05 +0100 |
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committer | Mark Brown <broonie@kernel.org> | 2018-01-10 11:30:07 +0100 |
commit | b688c18d30060e8a840d8af72790339c72acdac4 (patch) | |
tree | e2b9cd9b33b3db05d5836413ff374c556c72be77 /drivers/iio/buffer | |
parent | docs: driver-api: add iio hw consumer section (diff) | |
download | linux-b688c18d30060e8a840d8af72790339c72acdac4.tar.xz linux-b688c18d30060e8a840d8af72790339c72acdac4.zip |
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>
Diffstat (limited to 'drivers/iio/buffer')
-rw-r--r-- | drivers/iio/buffer/industrialio-hw-consumer.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/iio/buffer/industrialio-hw-consumer.c b/drivers/iio/buffer/industrialio-hw-consumer.c index 993ecdcdab64..95165697d8ae 100644 --- a/drivers/iio/buffer/industrialio-hw-consumer.c +++ b/drivers/iio/buffer/industrialio-hw-consumer.c @@ -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. |