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nvmem: Introduce devm_nvmem_(un)register()

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Introduce devm_nvmem_register()/devm_nvmem_unregister() to make
.remove() unnecessary in trivial drivers.

Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Carlo Caione <carlo@caione.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: cphealy@gmail.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Smirnov 2018-03-09 14:46:57 +00:00 committed by Greg Kroah-Hartman
parent fd0f4906a3
commit f1f50eca5f
2 changed files with 76 additions and 0 deletions
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59
drivers/nvmem/core.c
View File

@ -549,6 +549,65 @@ int nvmem_unregister(struct nvmem_device *nvmem)
}
EXPORT_SYMBOL_GPL(nvmem_unregister);
static void devm_nvmem_release(struct device *dev, void *res)
{
WARN_ON(nvmem_unregister(*(struct nvmem_device **)res));
}
/**
* devm_nvmem_register() - Register a managed nvmem device for given
* nvmem_config.
* Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
*
* @config: nvmem device configuration with which nvmem device is created.
*
* Return: Will be an ERR_PTR() on error or a valid pointer to nvmem_device
* on success.
*/
struct nvmem_device *devm_nvmem_register(struct device *dev,
const struct nvmem_config *config)
{
struct nvmem_device **ptr, *nvmem;
ptr = devres_alloc(devm_nvmem_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
nvmem = nvmem_register(config);
if (!IS_ERR(nvmem)) {
*ptr = nvmem;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return nvmem;
}
EXPORT_SYMBOL_GPL(devm_nvmem_register);
static int devm_nvmem_match(struct device *dev, void *res, void *data)
{
struct nvmem_device **r = res;
return *r == data;
}
/**
* devm_nvmem_unregister() - Unregister previously registered managed nvmem
* device.
*
* @nvmem: Pointer to previously registered nvmem device.
*
* Return: Will be an negative on error or a zero on success.
*/
int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
{
return devres_release(dev, devm_nvmem_release, devm_nvmem_match, nvmem);
}
EXPORT_SYMBOL(devm_nvmem_unregister);
static struct nvmem_device *__nvmem_device_get(struct device_node *np,
struct nvmem_cell **cellp,
const char *cell_id)

17
include/linux/nvmem-provider.h
View File

@ -72,6 +72,11 @@ struct nvmem_config {
struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
int nvmem_unregister(struct nvmem_device *nvmem);
struct nvmem_device *devm_nvmem_register(struct device *dev,
const struct nvmem_config *cfg);
int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem);
#else
static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
@ -84,5 +89,17 @@ static inline int nvmem_unregister(struct nvmem_device *nvmem)
return -ENOSYS;
}
static inline struct nvmem_device *
devm_nvmem_register(struct device *dev, const struct nvmem_config *c)
{
return nvmem_register(c);
}
static inline int
devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
{
return nvmem_unregister(nvmem);
}
#endif /* CONFIG_NVMEM */
#endif /* ifndef _LINUX_NVMEM_PROVIDER_H */