1.优先推荐：
http://www.alsa-project.org/~tiwai/writing-an-alsa-driver/
此帖有三个版本：
都可以在这里找到：
ALSA Driver Documentation – AlsaProject
http://www.alsa-project.org/main/index.php/ALSA_Driver_Documentation
另外上面也有ALSA的API文档：
而且，这里还有ALSA相关的所有的内容供下载：
http://www.alsa-project.org/main/index.php/Download
| Package | Stable Release (2012-01-25) | Development Release | Description |
|---|---|---|---|
| Driver (alsa-driver) | 1.0.25 | none | Kernel drivers |
| Firmware alsa-firmware) | 1.0.27 | none | Firmware for cards that require it |
| Library (alsa-lib) | 1.0.27.2 | none | Userspace library |
| Plugins (alsa-plugins) | 1.0.27 | none | Additional library plugins Eg.jack, pulse, maemo … |
| Utilities (alsa-utils) | 1.0.27.2 | none | Utilities aplay,arecord,amixer etc |
| Tools (alsa-tools) | 1.0.27 | none | Tools |
| PyALSA (pyalsa) | 1.0.26 | none | Python bindings for ALSA lib |
| OSS compat lib (alsa-oss) | 1.0.25 | none | OSS compatibility library |
2.这个pdf貌似不错：
Audio in embedded Linux systems
http://free-electrons.com/doc/embedded_linux_audio.pdf
http://www.suse.de/~mana/alsa090_howto.html
4.另外这个帖子：
Writing an ALSA Driver–PCM Interface – EIP的专栏 – 博客频道 – CSDN.NET
中有代码的逻辑的分析，可以参考参考。
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