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-ASoC Machine Driver
-===================
-
-The ASoC machine (or board) driver is the code that glues together the platform
-and codec drivers.
-
-The machine driver can contain codec and platform specific code. It registers
-the audio subsystem with the kernel as a platform device and is represented by
-the following struct:-
-
-/* SoC machine */
-struct snd_soc_card {
- char *name;
-
- ...
-
- int (*probe)(struct platform_device *pdev);
- int (*remove)(struct platform_device *pdev);
-
- /* the pre and post PM functions are used to do any PM work before and
- * after the codec and DAIs do any PM work. */
- int (*suspend_pre)(struct platform_device *pdev, pm_message_t state);
- int (*suspend_post)(struct platform_device *pdev, pm_message_t state);
- int (*resume_pre)(struct platform_device *pdev);
- int (*resume_post)(struct platform_device *pdev);
-
- ...
-
- /* CPU <--> Codec DAI links */
- struct snd_soc_dai_link *dai_link;
- int num_links;
-
- ...
-};
-
-probe()/remove()
-----------------
-probe/remove are optional. Do any machine specific probe here.
-
-
-suspend()/resume()
-------------------
-The machine driver has pre and post versions of suspend and resume to take care
-of any machine audio tasks that have to be done before or after the codec, DAIs
-and DMA is suspended and resumed. Optional.
-
-
-Machine DAI Configuration
--------------------------
-The machine DAI configuration glues all the codec and CPU DAIs together. It can
-also be used to set up the DAI system clock and for any machine related DAI
-initialisation e.g. the machine audio map can be connected to the codec audio
-map, unconnected codec pins can be set as such.
-
-struct snd_soc_dai_link is used to set up each DAI in your machine. e.g.
-
-/* corgi digital audio interface glue - connects codec <--> CPU */
-static struct snd_soc_dai_link corgi_dai = {
- .name = "WM8731",
- .stream_name = "WM8731",
- .cpu_dai_name = "pxa-is2-dai",
- .codec_dai_name = "wm8731-hifi",
- .platform_name = "pxa-pcm-audio",
- .codec_name = "wm8713-codec.0-001a",
- .init = corgi_wm8731_init,
- .ops = &corgi_ops,
-};
-
-struct snd_soc_card then sets up the machine with its DAIs. e.g.
-
-/* corgi audio machine driver */
-static struct snd_soc_card snd_soc_corgi = {
- .name = "Corgi",
- .dai_link = &corgi_dai,
- .num_links = 1,
-};
-
-
-Machine Power Map
------------------
-
-The machine driver can optionally extend the codec power map and to become an
-audio power map of the audio subsystem. This allows for automatic power up/down
-of speaker/HP amplifiers, etc. Codec pins can be connected to the machines jack
-sockets in the machine init function.
-
-
-Machine Controls
-----------------
-
-Machine specific audio mixer controls can be added in the DAI init function.