@@ -1624,6 +1624,24 @@ void nvmem_cell_put(struct nvmem_cell *cell)
}
EXPORT_SYMBOL_GPL(nvmem_cell_put);
+/**
+ * nvmem_cell_size() - Get nvmem cell size in bytes.
+ *
+ * @cell: nvmem cell.
+ *
+ * Return: size of the nvmem cell.
+ */
+size_t nvmem_cell_size(struct nvmem_cell *cell)
+{
+ struct nvmem_cell_entry *entry = cell->entry;
+
+ if (!entry)
+ return 0;
+
+ return entry->bytes;
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_size);
+
static void nvmem_shift_read_buffer_in_place(struct nvmem_cell_entry *cell, void *buf)
{
u8 *p, *b;
@@ -54,6 +54,7 @@ struct nvmem_cell *nvmem_cell_get(struct device *dev, const char *id);
struct nvmem_cell *devm_nvmem_cell_get(struct device *dev, const char *id);
void nvmem_cell_put(struct nvmem_cell *cell);
void devm_nvmem_cell_put(struct device *dev, struct nvmem_cell *cell);
+size_t nvmem_cell_size(struct nvmem_cell *cell);
void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
int nvmem_cell_read_u8(struct device *dev, const char *cell_id, u8 *val);
@@ -117,6 +118,11 @@ static inline void nvmem_cell_put(struct nvmem_cell *cell)
{
}
+static inline size_t nvmem_cell_size(struct nvmem_cell *cell)
+{
+ return 0;
+}
+
static inline void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
{
return ERR_PTR(-EOPNOTSUPP);
This function allows nvmem consumers to know the size of an nvmem cell before calling nvmem_cell_write() or nvmem_cell_read(), which is helpful for drivers that may need to handle devices with different cell sizes. Signed-off-by: Jennifer Berringer <jberring@redhat.com> --- drivers/nvmem/core.c | 18 ++++++++++++++++++ include/linux/nvmem-consumer.h | 6 ++++++ 2 files changed, 24 insertions(+)