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nvmem: core: add nvmem_dev_size() helper

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[ Upstream commit 33cf42e68e ]

This is required by layouts that need to read whole NVMEM content. It's
especially useful for NVMEM devices without hardcoded layout (like
U-Boot environment data block).

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20231221173421.13737-2-zajec5@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 8679e8b4a1 ("nvmem: u-boot-env: error if NVMEM device is too small")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafał Miłecki 2023-12-21 18:34:17 +01:00 committed by Greg Kroah-Hartman
parent f7dc14df1b
commit 820b1b981a
2 changed files with 14 additions and 0 deletions
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13
drivers/nvmem/core.c
View File

@ -2131,6 +2131,19 @@ const char *nvmem_dev_name(struct nvmem_device *nvmem)
} }
EXPORT_SYMBOL_GPL(nvmem_dev_name); EXPORT_SYMBOL_GPL(nvmem_dev_name);
/**
* nvmem_dev_size() - Get the size of a given nvmem device.
*
* @nvmem: nvmem device.
*
* Return: size of the nvmem device.
*/
size_t nvmem_dev_size(struct nvmem_device *nvmem)
{
return nvmem->size;
}
EXPORT_SYMBOL_GPL(nvmem_dev_size);
static int __init nvmem_init(void) static int __init nvmem_init(void)
{ {
return bus_register(&nvmem_bus_type); return bus_register(&nvmem_bus_type);

1
include/linux/nvmem-consumer.h
View File

@ -81,6 +81,7 @@ int nvmem_device_cell_write(struct nvmem_device *nvmem,
struct nvmem_cell_info *info, void *buf); struct nvmem_cell_info *info, void *buf);
const char *nvmem_dev_name(struct nvmem_device *nvmem); const char *nvmem_dev_name(struct nvmem_device *nvmem);
size_t nvmem_dev_size(struct nvmem_device *nvmem);
void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries, void nvmem_add_cell_lookups(struct nvmem_cell_lookup *entries,
size_t nentries); size_t nentries);