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- From 5008062f1c3f5af3acf86164aa6fcc77b0c7bdce Mon Sep 17 00:00:00 2001
- From: Srinivas Kandagatla <[email protected]>
- Date: Wed, 13 Oct 2021 14:19:56 +0100
- Subject: [PATCH] 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: Joakim Zhang <[email protected]>
- Signed-off-by: Srinivas Kandagatla <[email protected]>
- Link: https://lore.kernel.org/r/[email protected]
- Signed-off-by: Greg Kroah-Hartman <[email protected]>
- ---
- drivers/nvmem/core.c | 9 +++++++++
- include/linux/nvmem-provider.h | 5 +++++
- 2 files changed, 14 insertions(+)
- --- 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;
- };
- @@ -798,6 +799,7 @@ struct nvmem_device *nvmem_register(cons
- 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)
- @@ -1443,6 +1445,13 @@ static int __nvmem_cell_read(struct nvme
- 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;
-
- --- a/include/linux/nvmem-provider.h
- +++ b/include/linux/nvmem-provider.h
- @@ -19,6 +19,9 @@ typedef int (*nvmem_reg_read_t)(void *pr
- 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;
|
