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| author | Andreas Färber <afaerber@suse.de> | 2020-07-22 11:06:57 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-29 17:12:08 +0200 |
| commit | 5037d368b2c2c90e9432d477e5562dce1c33d5c9 (patch) | |
| tree | 496c1d82b71805c2028fa5f51049d37726758818 | |
| parent | 3a7580710b0344fd2d2fc9e988620fddd187b83e (diff) | |
| download | linux-stable-5037d368b2c2c90e9432d477e5562dce1c33d5c9.tar.gz linux-stable-5037d368b2c2c90e9432d477e5562dce1c33d5c9.tar.bz2 linux-stable-5037d368b2c2c90e9432d477e5562dce1c33d5c9.zip | |
nvmem: core: Add nvmem_cell_read_u8()
Complement the u16, u32 and u64 helpers with a u8 variant to ease
accessing byte-sized values.
This helper will be useful for Realtek Digital Home Center platforms,
which store some byte and sub-byte sized values in non-volatile memory.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-7-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/nvmem/core.c | 15 | ||||
| -rw-r--r-- | include/linux/nvmem-consumer.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index 95bed31391cd..d6bacc878500 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1375,6 +1375,21 @@ static int nvmem_cell_read_common(struct device *dev, const char *cell_id, } /** + * nvmem_cell_read_u8() - Read a cell value as a u8 + * + * @dev: Device that requests the nvmem cell. + * @cell_id: Name of nvmem cell to read. + * @val: pointer to output value. + * + * Return: 0 on success or negative errno. + */ +int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val) +{ + return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val)); +} +EXPORT_SYMBOL_GPL(nvmem_cell_read_u8); + +/** * nvmem_cell_read_u16() - Read a cell value as a u16 * * @dev: Device that requests the nvmem cell. diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h index 1b311d27c9b8..052293f4cbdb 100644 --- a/include/linux/nvmem-consumer.h +++ b/include/linux/nvmem-consumer.h @@ -61,6 +61,7 @@ void nvmem_cell_put(struct nvmem_cell *cell); void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell); void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len); int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len); +int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val); int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val); int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val); int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val); |