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>
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@ -1374,6 +1374,21 @@ static int nvmem_cell_read_common(struct device *dev, const char *cell_id,
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return 0;
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}
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/**
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* nvmem_cell_read_u8() - Read a cell value as a u8
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*
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* @dev: Device that requests the nvmem cell.
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* @cell_id: Name of nvmem cell to read.
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* @val: pointer to output value.
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*
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* Return: 0 on success or negative errno.
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*/
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int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val)
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{
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return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
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}
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EXPORT_SYMBOL_GPL(nvmem_cell_read_u8);
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/**
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* nvmem_cell_read_u16() - Read a cell value as a u16
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*
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@ -61,6 +61,7 @@ void nvmem_cell_put(struct nvmem_cell *cell);
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void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
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void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
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int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
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int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);
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int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val);
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int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val);
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int nvmem_cell_read_u64(struct device *dev, const char *cell_id, u64 *val);
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