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nvmem: core: add per-cell post processing 

Instead of relying on the name the consumer is using for the cell, like
it is done for the nvmem .cell_post_process configuration parameter,
provide a per-cell post processing hook. This can then be populated by
the NVMEM provider (or the NVMEM layout) when adding the cell.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230404172148.82422-17-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Walle 2023-04-04 18:21:24 +01:00 committed by Greg Kroah-Hartman
parent b1c37bec1c
commit 345ec382cd
2 changed files with 20 additions and 0 deletions
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17
drivers/nvmem/core.c
View File

@ -54,6 +54,7 @@ struct nvmem_cell_entry {
int bytes;
int bit_offset;
int nbits;
nvmem_cell_post_process_t read_post_process;
struct device_node *np;
struct nvmem_device *nvmem;
struct list_head node;
@ -470,6 +471,7 @@ static int nvmem_cell_info_to_nvmem_cell_entry_nodup(struct nvmem_device *nvmem,
cell->offset = info->offset;
cell->bytes = info->bytes;
cell->name = info->name;
cell->read_post_process = info->read_post_process;
cell->bit_offset = info->bit_offset;
cell->nbits = info->nbits;
@ -1563,6 +1565,13 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
if (cell->bit_offset || cell->nbits)
nvmem_shift_read_buffer_in_place(cell, buf);
if (cell->read_post_process) {
rc = cell->read_post_process(nvmem->priv, id, index,
cell->offset, buf, cell->bytes);
if (rc)
return rc;
}
if (nvmem->cell_post_process) {
rc = nvmem->cell_post_process(nvmem->priv, id, index,
cell->offset, buf, cell->bytes);
@ -1671,6 +1680,14 @@ static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, si
(cell->bit_offset == 0 && len != cell->bytes))
return -EINVAL;
/*
* Any cells which have a read_post_process hook are read-only because
* we cannot reverse the operation and it might affect other cells,
* too.
*/
if (cell->read_post_process)
return -EINVAL;
if (cell->bit_offset || cell->nbits) {
buf = nvmem_cell_prepare_write_buffer(cell, buf, len);
if (IS_ERR(buf))

3
include/linux/nvmem-provider.h
View File

@ -54,6 +54,8 @@ struct nvmem_keepout {
* @bit_offset: Bit offset if cell is smaller than a byte.
* @nbits: Number of bits.
* @np: Optional device_node pointer.
* @read_post_process: Callback for optional post processing of cell data
* on reads.
*/
struct nvmem_cell_info {
const char *name;
@ -62,6 +64,7 @@ struct nvmem_cell_info {
unsigned int bit_offset;
unsigned int nbits;
struct device_node *np;
nvmem_cell_post_process_t read_post_process;
};
/**