From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH 1/2] nvmem: Introduce nvmem_cell_get_and_read()
Date: Tue, 26 Jun 2018 20:58:41 -0700 [thread overview]
Message-ID: <20180627035842.17858-1-andrew.smirnov@gmail.com> (raw)
Introduce nvmem_cell_get_and_read() that combines getting a NVMEM cell
by name and reading its contents.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/nvmem/core.c | 23 +++++++++++++++++++++++
include/linux/nvmem-consumer.h | 10 ++++++++++
2 files changed, 33 insertions(+)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 53b934bb3..c785de125 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -750,3 +750,26 @@ int nvmem_device_write(struct nvmem_device *nvmem,
return bytes;
}
EXPORT_SYMBOL_GPL(nvmem_device_write);
+
+void *nvmem_cell_get_and_read(struct device_node *np, const char *cell_name,
+ size_t bytes)
+{
+ struct nvmem_cell *cell;
+ void *value;
+ size_t len;
+
+ cell = of_nvmem_cell_get(np, cell_name);
+ if (IS_ERR(cell))
+ return cell;
+
+ value = nvmem_cell_read(cell, &len);
+ if (!IS_ERR(value) && len != bytes) {
+ kfree(value);
+ value = ERR_PTR(-EINVAL);
+ }
+
+ nvmem_cell_put(cell);
+
+ return value;
+}
+EXPORT_SYMBOL_GPL(nvmem_cell_get_and_read);
\ No newline at end of file
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index 606cadb49..0ec2f05b9 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -32,6 +32,9 @@ struct nvmem_cell_info {
struct nvmem_cell *nvmem_cell_get(struct device_d *dev, const char *name);
void nvmem_cell_put(struct nvmem_cell *cell);
void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len);
+void *nvmem_cell_get_and_read(struct device_node *np, const char *cell_name,
+ size_t bytes);
+
int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len);
/* direct nvmem device read/write interface */
@@ -55,6 +58,13 @@ static inline char *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
return ERR_PTR(-ENOSYS);
}
+static inline void *nvmem_cell_get_and_read(struct device_node *np,
+ const char *cell_name,
+ size_t bytes)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
static inline int nvmem_cell_write(struct nvmem_cell *cell,
const char *buf, size_t len)
{
--
2.17.1
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next reply other threads:[~2018-06-27 3:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-27 3:58 Andrey Smirnov [this message]
2018-06-27 3:58 ` [PATCH 2/2] ARM: rdu2: Fetch MAC address info from RAVE SP EEPROM Andrey Smirnov
2018-06-27 9:05 ` [PATCH 1/2] nvmem: Introduce nvmem_cell_get_and_read() Lucas Stach
2018-06-27 16:57 ` Andrey Smirnov
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