i2c_new_dummy is typically called from the probe function of the
driver for the primary i2c client. It requires calls to
i2c_unregister_device in the error path of the probe function and
in the remove function.
This can be simplified by introducing a device-managed version.
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
drivers/i2c/i2c-core-base.c | 29 +++++++++++++++++++++++++++++
include/linux/i2c.h | 3 +++
2 files changed, 32 insertions(+)
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 12822a4b..7eb48328 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -868,6 +868,35 @@ struct i2c_client *i2c_new_dummy(struct i2c_adapter *adapter, u16 address)
}
EXPORT_SYMBOL_GPL(i2c_new_dummy);
+static void devm_i2c_release_dummy(struct device *dev, void *res)
+{
+ i2c_unregister_device(*(struct i2c_client **)res);
+}
+
+/* managed version of i2c_new_dummy */
+struct i2c_client *devm_i2c_new_dummy(struct device *dev,
+ struct i2c_adapter *adapter,
+ u16 address)
+{
+ struct i2c_client *ret, **dr;
+
+ dr = devres_alloc(devm_i2c_release_dummy, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return NULL;
+
+ ret = i2c_new_dummy(adapter, address);
+ if (!ret) {
+ devres_free(dr);
+ return NULL;
+ }
+
+ *dr = ret;
+ devres_add(dev, dr);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_i2c_new_dummy);
+
/**
* i2c_new_secondary_device - Helper to get the instantiated secondary address
* and create the associated device
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index d501d395..d0c091e6 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -381,6 +381,9 @@ extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
extern struct i2c_client *
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
+extern struct i2c_client *
+devm_i2c_new_dummy(struct device *dev, struct i2c_adapter *adap, u16 address);
+
extern struct i2c_client *
i2c_new_secondary_device(struct i2c_client *client,
const char *name,
--
2.14.1
