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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 <[email protected]>
Cc: Heiko Stuebner <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Carlo Caione <[email protected]>
Cc: Kevin Hilman <[email protected]>
Cc: Matthias Brugger <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Andrey Smirnov <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Andrey Smirnov 2018-03-09 14:46:57 +00:00 • committed by Greg Kroah-Hartman
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)