Commit 5008062f authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Greg Kroah-Hartman
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nvmem: core: add nvmem cell post processing callback 



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.

Tested-by: default avatarJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211013131957.30271-3-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7ae6478b

drivers/nvmem/core.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

};
@@ -796,6 +797,7 @@ 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)
@@ -1440,6 +1442,13 @@ 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, id,

					      cell->offset, buf, cell->bytes);

		if (rc)

			return rc;

	}



	if (len)

		*len = cell->bytes;

include/linux/nvmem-provider.h

+5 −0
Original line number Diff line number Diff line
@@ -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, const char *id, 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_post_process:	Callback for vendor specific post processing of cell data

 * @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;