i2c: core: add managed function for adding i2c adapters

mainline inclusion
from mainline-v5.13-rc1
commit 07740c92
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I42E7E
CVE: NA

---------------------------

Some I2C controller drivers will only unregister the I2C
adapter in their .remove() callback, which can be done
by simply using a managed variant to add the I2C adapter.

So add the managed functions for adding the I2C adapter.
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: NDmitry Osipenko <digetx@gmail.com>
Signed-off-by: NYicong Yang <yangyicong@hisilicon.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>
Conflicts:
	drivers/i2c/i2c-core-base.c
	include/linux/i2c.h
Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Reviewed-by: Sheng Feng < fengsheng5@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/i2c/i2c-core-base.c

@@ -1533,6 +1533,32 @@ void i2c_del_adapter(struct i2c_adapter *adap)
 }
 EXPORT_SYMBOL(i2c_del_adapter);
 
+static void devm_i2c_del_adapter(void *adapter)
+{
+	i2c_del_adapter(adapter);
+}
+
+/**
+ * devm_i2c_add_adapter - device-managed variant of i2c_add_adapter()
+ * @dev: managing device for adding this I2C adapter
+ * @adapter: the adapter to add
+ * Context: can sleep
+ *
+ * Add adapter with dynamic bus number, same with i2c_add_adapter()
+ * but the adapter will be auto deleted on driver detach.
+ */
+int devm_i2c_add_adapter(struct device *dev, struct i2c_adapter *adapter)
+{
+	int ret;
+
+	ret = i2c_add_adapter(adapter);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev, devm_i2c_del_adapter, adapter);
+}
+EXPORT_SYMBOL_GPL(devm_i2c_add_adapter);
+
 /**
  * i2c_parse_fw_timings - get I2C related timing parameters from firmware
  * @dev: The device to scan for I2C timing properties

include/linux/i2c.h

@@ -796,6 +796,8 @@ i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags)
  */
 #if IS_ENABLED(CONFIG_I2C)
 extern int i2c_add_adapter(struct i2c_adapter *);
+extern int devm_i2c_add_adapter(struct device *dev,
+				struct i2c_adapter *adapter);
 extern void i2c_del_adapter(struct i2c_adapter *);
 extern int i2c_add_numbered_adapter(struct i2c_adapter *);