linux-kernel - [PATCH v3 14/18] nvmem: core: provide own priv pointer in post process callback

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Date:   Fri, 18 Nov 2022 19:51:14 +0100
From:   Michael Walle <michael@...le.cc>
To:     Jonathan Corbet <corbet@....net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Michael Walle <michael@...le.cc>
Subject: [PATCH v3 14/18] nvmem: core: provide own priv pointer in post process callback

It doesn't make any more sense to have a opaque pointer set up by the
nvmem device. Usually, the layout isn't associated with a particular
nvmem device. Instead, let the caller who set the post process callback
provide the priv pointer.

Signed-off-by: Michael Walle <michael@...le.cc>
---
changes since v2:
 - don't drop the pointer but let the user specify an opaque pointer

changes since v1:
 - new patch

 drivers/nvmem/core.c           | 4 +++-
 include/linux/nvmem-provider.h | 5 ++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 9234c7d87a69..e03976f6ad1c 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -53,6 +53,7 @@ struct nvmem_cell_entry {
 	int			bit_offset;
 	int			nbits;
 	nvmem_cell_post_process_t read_post_process;
+	void			*priv;
 	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->bytes = info->bytes;
 	cell->name = info->name;
 	cell->read_post_process = info->read_post_process;
+	cell->priv = info->priv;
 
 	cell->bit_offset = info->bit_offset;
 	cell->nbits = info->nbits;
@@ -1558,7 +1560,7 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
 		nvmem_shift_read_buffer_in_place(cell, buf);
 
 	if (cell->read_post_process) {
-		rc = cell->read_post_process(nvmem->priv, id, index,
+		rc = cell->read_post_process(cell->priv, id, index,
 					     cell->offset, buf, cell->bytes);
 		if (rc)
 			return rc;
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index 12833fe4eb4d..cb0814f2ddae 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -20,7 +20,8 @@ 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, int index,
-					 unsigned int offset, void *buf, size_t bytes);
+					 unsigned int offset, void *buf,
+					 size_t bytes);
 
 enum nvmem_type {
 	NVMEM_TYPE_UNKNOWN = 0,
@@ -56,6 +57,7 @@ struct nvmem_keepout {
  * @np:		Optional device_node pointer.
  * @read_post_process:	Callback for optional post processing of cell data
  *			on reads.
+ * @priv:	Opaque data passed to the read_post_process hook.
  */
 struct nvmem_cell_info {
 	const char		*name;
@@ -65,6 +67,7 @@ struct nvmem_cell_info {
 	unsigned int		nbits;
 	struct device_node	*np;
 	nvmem_cell_post_process_t read_post_process;
+	void			*priv;
 };
 
 /**
-- 
2.30.2