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UCM: get: Implement 'exact' value retrieval

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[=]<NAME>[/[<modifier>|</device>][/<verb>]]
- value identifier <NAME>
- Search starts at given modifier or device if any,
    else at a verb
- Search starts at given verb if any,
    else current verb
- Searches modifier/device, then verb, then defaults
- Specify a leading "=" to search only the exact
  device/modifier/verb specified, and not search
  through each object in turn.
- Examples:
    "PlaybackPCM/Play Music"
    "CapturePCM/SPDIF"
  From ValueDefaults only:
    "=Variable"
  From current active verb:
    "=Variable//"
  From verb "Verb":
    "=Variable//Verb"
  From "Modifier" in current active verb:
    "=Variable/Modifier/"
  From "Modifier" in "Verb":
    "=Variable/Modifier/Verb"

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Stephen Warren 2011-06-06 14:16:57 -06:00 • committed by Takashi Iwai
parent a48f67c0ed
commit e2c2262403
2 changed files with 104 additions and 36 deletions
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30
include/use-case.h
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@ -230,12 +230,30 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr,
* NULL - return current card
* _verb - return current verb
*
* <NAME>[/<modifier>|</device>]
* - value identifier <NAME> for
* given modifier or device
* - Examples: "PlaybackPCM/Play Music",
* "CapturePCM/SPDIF"
*
* [=]<NAME>[/[<modifier>|</device>][/<verb>]]
* - value identifier <NAME>
* - Search starts at given modifier or device if any,
* else at a verb
* - Search starts at given verb if any,
* else current verb
* - Searches modifier/device, then verb, then defaults
* - Specify a leading "=" to search only the exact
* device/modifier/verb specified, and not search
* through each object in turn.
* - Examples:
* "PlaybackPCM/Play Music"
* "CapturePCM/SPDIF"
* From ValueDefaults only:
* "=Variable"
* From current active verb:
* "=Variable//"
* From verb "Verb":
* "=Variable//Verb"
* From "Modifier" in current active verb:
* "=Variable/Modifier/"
* From "Modifier" in "Verb":
* "=Variable/Modifier/Verb"
*
* Recommended names for values:
* TQ - Tone Quality
* PlaybackPCM - full PCM playback device name