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author | Leonard Crestez <leonard.crestez@nxp.com> | 2017-07-26 11:34:46 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-28 17:33:23 +0200 |
commit | d026d70a2e9460dc701d20b48672b80a2656006d (patch) | |
tree | 24acc74a69f48c4f163b75c9764305f19f33da68 /drivers/nvmem | |
parent | nvmem: Convert to using %pOF instead of full_name (diff) | |
download | linux-d026d70a2e9460dc701d20b48672b80a2656006d.tar.xz linux-d026d70a2e9460dc701d20b48672b80a2656006d.zip |
nvmem: core: Add nvmem_cell_read_u32
This function does a quick and easy read of an u32 value without any
kind of resource management code on the consumer side.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem')
-rw-r--r-- | drivers/nvmem/core.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index b0c60338296a..72a60dc8a429 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -1111,6 +1111,43 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len) EXPORT_SYMBOL_GPL(nvmem_cell_write); /** + * nvmem_cell_read_u32() - Read a cell value as an u32 + * + * @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_u32(struct device *dev, const char *cell_id, u32 *val) +{ + struct nvmem_cell *cell; + void *buf; + size_t len; + + cell = nvmem_cell_get(dev, cell_id); + if (IS_ERR(cell)) + return PTR_ERR(cell); + + buf = nvmem_cell_read(cell, &len); + if (IS_ERR(buf)) { + nvmem_cell_put(cell); + return PTR_ERR(buf); + } + if (len != sizeof(*val)) { + kfree(buf); + nvmem_cell_put(cell); + return -EINVAL; + } + memcpy(val, buf, sizeof(*val)); + + kfree(buf); + nvmem_cell_put(cell); + return 0; +} +EXPORT_SYMBOL_GPL(nvmem_cell_read_u32); + +/** * nvmem_device_cell_read() - Read a given nvmem device and cell * * @nvmem: nvmem device to read from. |