本文转载自:http://blog.csdn.net/u011975319/article/details/52128845 本文有此处转载http://blog.csdn.net/luckywang1103/article/details/47091817 3.0linux内核版本中,codec driver是直接调用i2c的i2c_master_send函数与i2c_transfer函数来实现i2c的读写, 3.3版本,codec driver通过调用snd_soc_read和snd_soc…

1. 内核版本 5.2.0 2. 请看devm_regmap_init_i2c (include/linux/regmap.h) /** * devm_regmap_init_i2c() - Initialise managed register map * * @i2c: Device that will be interacted with * @config: Configuration for register map * * The return value will be an ER…