[PATCH 04/28] nvmem: provide nvmem_device_name()

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Kernel users don't have any means of checking the names of nvmem
devices. Add a routine that returns the name of the nvmem provider.

This will be useful for nvmem notifier subscribers - otherwise they
can't check what device is being added/removed.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/nvmem/core.c           | 6 ++++++
 include/linux/nvmem-consumer.h | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 128c8e51bff2..b040370292a7 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -1440,6 +1440,12 @@ int nvmem_device_write(struct nvmem_device *nvmem,
 }
 EXPORT_SYMBOL_GPL(nvmem_device_write);
 
+const char *nvmem_device_name(struct nvmem_device *nvmem)
+{
+	return dev_name(&nvmem->dev);
+}
+EXPORT_SYMBOL_GPL(nvmem_device_name);
+
 static int __init nvmem_init(void)
 {
 	return bus_register(&nvmem_bus_type);
diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
index ae4d30347602..c4000a218f67 100644
--- a/include/linux/nvmem-consumer.h
+++ b/include/linux/nvmem-consumer.h
@@ -69,6 +69,8 @@ int nvmem_device_cell_write(struct nvmem_device *nvmem,
 
 int nvmem_register_notifier(struct notifier_block *nb);
 int nvmem_unregister_notifier(struct notifier_block *nb);
+
+const char *nvmem_device_name(struct nvmem_device *nvmem);
 #else
 
 static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
@@ -167,6 +169,11 @@ static inline int int nvmem_unregister_notifier(struct notifier_block *nb)
 {
 	return -ENOSYS;
 }
+
+static inline const char *nvmem_device_name(struct nvmem_device *nvmem)
+{
+	return ERR_PTR(-ENOSYS);
+}
 #endif /* CONFIG_NVMEM */
 
 #if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)
-- 
2.18.0

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