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i2c: core: add managed function for adding i2c adapters 

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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Yicong Yang 2021-04-08 19:17:17 +08:00 committed by Wolfram Sang
parent 2375843b50
commit 07740c92ae
2 changed files with 27 additions and 0 deletions
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26
drivers/i2c/i2c-core-base.c
View File

@ -1693,6 +1693,32 @@ 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);
static void i2c_parse_timing(struct device *dev, char *prop_name, u32 *cur_val_p,
u32 def_val, bool use_def)
{

1
include/linux/i2c.h
View File

@ -846,6 +846,7 @@ static inline void i2c_mark_adapter_resumed(struct i2c_adapter *adap)
*/
#if IS_ENABLED(CONFIG_I2C)
int i2c_add_adapter(struct i2c_adapter *adap);
int devm_i2c_add_adapter(struct device *dev, struct i2c_adapter *adapter);
void i2c_del_adapter(struct i2c_adapter *adap);
int i2c_add_numbered_adapter(struct i2c_adapter *adap);