This adds of_get_i2c_adapter_by_node which both finds and properly
increments the adapter reference count.
This is different from of_find_i2c_device_by_node which does not
increment the adapter reference counter.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
Signed-off-by: Joshua Frkuska <joshua_frkuska@xxxxxxxxxx>
---
drivers/i2c/i2c-core.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 987c124..97caec6 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1347,6 +1347,26 @@ struct i2c_adapter
*of_find_i2c_adapter_by_node(struct device_node *node)
return i2c_verify_adapter(dev);
}
EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
+
+/* must call put_device() when done with returned i2c_adapter device */
+struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node)
+{
+ struct device *dev;
+ struct i2c_adapter *adapter;
+
+ dev = bus_find_device(&i2c_bus_type, NULL, node,
+ of_dev_node_match);
+ if (!dev)
+ return NULL;
+
+ adapter = i2c_verify_adapter(dev);
+
+ if (adapter && !try_module_get(adapter->owner))
+ adapter = NULL;
+
+ return adapter;
+}
+EXPORT_SYMBOL(of_get_i2c_adapter_by_node);
#else
static void of_i2c_register_devices(struct i2c_adapter *adap) { }
#endif /* CONFIG_OF */
--
Joshua Frkuska | Embedded Software Engineer
Mentor Embedded Software Division
Mentor Graphics Japan Co., ltd.
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