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Subject[PATCH v5 03/21] nvmem: Introduce devm_nvmem_(un)register()
Date
Introduce devm_nvmem_register()/devm_nvmem_unregister() to make
.remove() unnecessary in trivial drivers.

Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Carlo Caione <carlo@caione.org>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: cphealy@gmail.com
Cc: linux-kernel@vger.kernel.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
drivers/nvmem/core.c | 57 ++++++++++++++++++++++++++++++++++++++++++
include/linux/nvmem-provider.h | 17 +++++++++++++
2 files changed, 74 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 99e04cfcc723..4957536c9fea 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -549,6 +549,63 @@ int nvmem_unregister(struct nvmem_device *nvmem)
}
EXPORT_SYMBOL_GPL(nvmem_unregister);

+static void devm_nvmem_release(struct device *dev, void *res)
+{
+ WARN_ON(nvmem_unregister(*(struct nvmem_device **)res));
+}
+
+/**
+ * devm_nvmem_register() - Register a managed nvmem device for given nvmem_config.
+ * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem
+ *
+ * @config: nvmem device configuration with which nvmem device is created.
+ *
+ * Return: Will be an ERR_PTR() on error or a valid pointer to nvmem_device
+ * on success.
+ */
+struct nvmem_device *devm_nvmem_register(struct device *dev,
+ const struct nvmem_config *config)
+{
+ struct nvmem_device **ptr, *nvmem;
+
+ ptr = devres_alloc(devm_nvmem_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ nvmem = nvmem_register(config);
+
+ if (!IS_ERR(nvmem)) {
+ *ptr = nvmem;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return nvmem;
+}
+EXPORT_SYMBOL_GPL(devm_nvmem_register);
+
+static int devm_nvmem_match(struct device *dev, void *res, void *data)
+{
+ struct nvmem_device **r = res;
+
+ return *r == data;
+}
+
+/**
+ * devm_nvmem_unregister() - Unregister previously registered managed nvmem device
+ *
+ * @nvmem: Pointer to previously registered nvmem device.
+ *
+ * Return: Will be an negative on error or a zero on success.
+ */
+int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
+{
+ return devres_release(dev, devm_nvmem_release, devm_nvmem_match, nvmem);
+}
+EXPORT_SYMBOL(devm_nvmem_unregister);
+
+
static struct nvmem_device *__nvmem_device_get(struct device_node *np,
struct nvmem_cell **cellp,
const char *cell_id)
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index b00567a07496..f89598bc4e1c 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -72,6 +72,11 @@ struct nvmem_config {
struct nvmem_device *nvmem_register(const struct nvmem_config *cfg);
int nvmem_unregister(struct nvmem_device *nvmem);

+struct nvmem_device *devm_nvmem_register(struct device *dev,
+ const struct nvmem_config *cfg);
+
+int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem);
+
#else

static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
@@ -84,5 +89,17 @@ static inline int nvmem_unregister(struct nvmem_device *nvmem)
return -ENOSYS;
}

+static inline struct nvmem_device *
+devm_nvmem_register(struct device *dev, const struct nvmem_config *c)
+{
+ return nvmem_register(c);
+}
+
+static inline int
+devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
+{
+ return nvmem_unregister(nvmem);
+}
+
#endif /* CONFIG_NVMEM */
#endif /* ifndef _LINUX_NVMEM_PROVIDER_H */
--
2.14.3
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