1. 根目录:
2. sound
3. soc
4. sirf
5. Makefile

snd-soc-sirf-audio-objs := sirf-audio.o
snd-soc-sirf-audio-port-objs := sirf-audio-port.o
snd-soc-sirf-usp-objs := sirf-usp.o

obj-$(CONFIG_SND_SOC_SIRF_AUDIO) += snd-soc-sirf-audio.o
obj-$(CONFIG_SND_SOC_SIRF_AUDIO_PORT) += snd-soc-sirf-audio-port.o
obj-$(CONFIG_SND_SOC_SIRF_USP) += snd-soc-sirf-usp.o