linux内核中i2c驱动中slave模式接口的调用

Posted 2020-11-16 Jello

1. 关注unreg_slave接口

　　1.1 这个接口在哪里被调用呢?

　　　　在drivers/i2c/i2c-core-slave.c中　　

　　　　int i2c_slave_unregister(struct i2c_client *client)
　　　　{
　　　　　　int ret;

　　　　 if (!client->adapter->algo->unreg_slave) {
                dev_err(&client->dev, "%s: not supported by adapter
", __func__);
                return -EOPNOTSUPP;
        }

        i2c_lock_bus(client->adapter, I2C_LOCK_ROOT_ADAPTER);
        ret = client->adapter->algo->unreg_slave(client);
        i2c_unlock_bus(client->adapter, I2C_LOCK_ROOT_ADAPTER);

        if (ret == 0)
                client->slave_cb = NULL;
        else
                dev_err(&client->dev, "%s: adapter returned error %d
", __func__, ret);

        return ret;
　　}

　　1.2 那么i2c_slave_unregister又是在哪里被调用的呢？

　　　　在drivers/i2c/i2c-slave-eeprom.c中被调用

　　　　

static int i2c_slave_eeprom_remove(struct i2c_client *client)
{
        struct eeprom_data *eeprom = i2c_get_clientdata(client);

        i2c_slave_unregister(client);
        sysfs_remove_bin_file(&client->dev.kobj, &eeprom->bin);

        return 0;
}