diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2018-12-06 13:43:46 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-12-11 01:04:23 +0000 |
| commit | 891ddbc79a61eb5b919cf56202ecaf7259878cb2 (patch) | |
| tree | e4b1a683a2b5761d77b4525368f251897644b0a6 /drivers/gpio | |
| parent | cb28ee388e465a956b05ada682f9ef90e776a9b7 (diff) | |
| download | linux-891ddbc79a61eb5b919cf56202ecaf7259878cb2.tar.bz2 | |
gpio: Add devm_gpiod_unhinge()
This adds a function named devm_gpiod_unhinge() that removes
the resource management from a GPIO descriptor.
I am not sure if this is the best anglosaxon name for the
function, no other managed resources have an equivalent
currently, but I chose "unhinge" as the closest intuitive
thing I could imagine that fits Rusty Russell's API design
criterions "the obvious use is the correct one" and
"the name tells you how to use it".
The idea came out of a remark from Mark Brown that it should
be possible to handle over management of a resource from
devres to the regulator core, and indeed we can do that.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-devres.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-devres.c b/drivers/gpio/gpiolib-devres.c index f9591b5c9748..0acc2cc6e868 100644 --- a/drivers/gpio/gpiolib-devres.c +++ b/drivers/gpio/gpiolib-devres.c @@ -347,6 +347,36 @@ void devm_gpiod_put(struct device *dev, struct gpio_desc *desc) EXPORT_SYMBOL(devm_gpiod_put); /** + * devm_gpiod_unhinge - Remove resource management from a gpio descriptor + * @dev: GPIO consumer + * @desc: GPIO descriptor to remove resource management from + * + * Remove resource management from a GPIO descriptor. This is needed when + * you want to hand over lifecycle management of a descriptor to another + * mechanism. + */ + +void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc) +{ + int ret; + + if (IS_ERR_OR_NULL(desc)) + return; + ret = devres_destroy(dev, devm_gpiod_release, + devm_gpiod_match, &desc); + /* + * If the GPIO descriptor is requested as nonexclusive, we + * may call this function several times on the same descriptor + * so it is OK if devres_destroy() returns -ENOENT. + */ + if (ret == -ENOENT) + return; + /* Anything else we should warn about */ + WARN_ON(ret); +} +EXPORT_SYMBOL(devm_gpiod_unhinge); + +/** * devm_gpiod_put_array - Resource-managed gpiod_put_array() * @dev: GPIO consumer * @descs: GPIO descriptor array to dispose of |