On 08.09.21 12:02, Joakim Zhang wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
>
> Some NVMEM providers have certain nvmem cells encoded, which requires
> post processing before actually using it.
>
> For example mac-address is stored in either in ascii or delimited or reverse-order.
>
> Having a post-process callback hook to provider drivers would enable them to
> do this vendor specific post processing before nvmem consumers see it.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
> Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx>
> ---
> drivers/nvmem/core.c | 9 +++++++++
> include/linux/nvmem-provider.h | 5 +++++
> 2 files changed, 14 insertions(+)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 23c08dbaf45e..4f81a3adf081 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -38,6 +38,7 @@ struct nvmem_device {
> unsigned int nkeepout;
> nvmem_reg_read_t reg_read;
> nvmem_reg_write_t reg_write;
> + nvmem_cell_post_process_t cell_post_process;
> struct gpio_desc *wp_gpio;
> void *priv;
> };
> @@ -797,6 +798,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
> nvmem->type = config->type;
> nvmem->reg_read = config->reg_read;
> nvmem->reg_write = config->reg_write;
> + nvmem->cell_post_process = config->cell_post_process;
> nvmem->keepout = config->keepout;
> nvmem->nkeepout = config->nkeepout;
> if (config->of_node)
> @@ -1404,6 +1406,13 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
> if (cell->bit_offset || cell->nbits)
> nvmem_shift_read_buffer_in_place(cell, buf);
>
> + if (nvmem->cell_post_process) {
> + rc = nvmem->cell_post_process(nvmem->priv, cell->type,
> + cell->offset, buf, cell->bytes);
> + if (rc)
> + return rc;
> + }
> +
> if (len)
> *len = cell->bytes;
>
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index 104505e9028f..d980c79f9605 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -19,6 +19,9 @@ typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset,
> void *val, size_t bytes);
> typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
> void *val, size_t bytes);
> +/* used for vendor specific post processing of cell data */
> +typedef int (*nvmem_cell_post_process_t)(void *priv, int type, unsigned int offset,
> + void *buf, size_t bytes);
>
> enum nvmem_type {
> NVMEM_TYPE_UNKNOWN = 0,
> @@ -62,6 +65,7 @@ struct nvmem_keepout {
> * @no_of_node: Device should not use the parent's of_node even if it's !NULL.
> * @reg_read: Callback to read data.
> * @reg_write: Callback to write data.
> + * @cell_read_callback: Callback for vendor specific post processing of cell data
The member below is called cell_post_process
> * @size: Device size.
> * @word_size: Minimum read/write access granularity.
> * @stride: Minimum read/write access stride.
> @@ -92,6 +96,7 @@ struct nvmem_config {
> bool no_of_node;
> nvmem_reg_read_t reg_read;
> nvmem_reg_write_t reg_write;
> + nvmem_cell_post_process_t cell_post_process;
> int size;
> int word_size;
> int stride;
>
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