[PATCH v2 1/2] aiodev: add helper for getting a value by its channel name

[Sascha Hauer <s.hauer@pengutronix.de>]

It's a common pattern to get an aiochannel by name and the value
afterwards. Add a helper for this pattern.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/aiodev/core.c | 12 ++++++++++++
 include/aiodev.h      |  9 +++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/aiodev/core.c b/drivers/aiodev/core.c
index 1fbb7b9188..5bdc4d83d4 100644
--- a/drivers/aiodev/core.c
+++ b/drivers/aiodev/core.c
@@ -73,6 +73,18 @@ int aiochannel_get_value(struct aiochannel *aiochan, int *value)
 }
 EXPORT_SYMBOL(aiochannel_get_value);
 
+int aiochannel_name_get_value(const char *chname, int *value)
+{
+	struct aiochannel *aio;
+
+	aio = aiochannel_by_name(chname);
+	if (IS_ERR(aio))
+		return PTR_ERR(aio);
+
+	return aiochannel_get_value(aio, value);
+}
+EXPORT_SYMBOL(aiochannel_name_get_value);
+
 int aiochannel_get_index(struct aiochannel *aiochan)
 {
 	return aiochan->index;
diff --git a/include/aiodev.h b/include/aiodev.h
index 56bd2da9f5..fb0807ad42 100644
--- a/include/aiodev.h
+++ b/include/aiodev.h
@@ -47,4 +47,13 @@ static inline const char *aiochannel_get_unit(struct aiochannel *aiochan)
 extern struct list_head aiodevices;
 #define for_each_aiodevice(aiodevice) list_for_each_entry(aiodevice, &aiodevices, list)
 
+#ifdef CONFIG_AIODEV
+int aiochannel_name_get_value(const char *chname, int *value);
+#else
+static inline int aiochannel_name_get_value(const char *chname, int *value)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 #endif
-- 
2.39.2