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For binary controls we don't want to go through
mixer_ctl_{set,get}_value() as that will trigger many calls to our
get()/put() callback in the kernel. Set the entire payload at once
and trigger the get()/put() callback once.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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Just like the pcm_get_error() API, simplify the mixer API
functions to return pointers to constant strings instead
of making copies of strings.
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Use existing routines to read BYTE controls. Somewhat inefficient
since an ioctl is done for every byte, some caching in intermediate
fields would be beneficial.
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Remove the use of the errno variable and instead return errors
directly where appropriate.
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- re-add function to set enum type by string
- implement setting of mixer values in tinymix
- fix bug: read current mixer values before writing
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- simplify interface for setting/getting enum values
- implement enum string get function
- update tinymix to deal with enums
- rename set/get_int functions because of supported types
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- support get/set of multiple values
- add parameter checking to functions
- add api function to get control type
- add tinymix utility to list mixer controls
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