On Wed, Sep 09, 2015 at 11:16:08AM +0800, Wu, Songjun wrote: > On 9/8/2015 20:23, Mark Brown wrote: > >If you want to have three controls you need to write code so that the > >user can only change one of them from 0dB at once, returning an error > >otherwise. That was why it looked like they were three separate > >controls. > If user operates two or tree controls at the same time, for my > understanding, these operations are serial actually in kernel, not parallel, > and the last operation will be effective. I only write the function > 'classd_get_eq_enum' to get the enumeration value, if user changes one of > controls, the other controls will get 0dB. Is my understanding correct? Yes, that's what's going to end up happening but it's not how controls are expected to behave - applications will expect changing one control to leave others unaffected so it's better to return an error rather than change the other control.
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