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    SubjectRe: [alsa-devel] [PATCH 2/4] ASoC: cx20442: add bias control over a platform provided regulator
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    On Monday 26 of December 2011 at 12:02:01, Mark Brown wrote:
    > On Sat, Dec 24, 2011 at 12:12:22AM +0100, Janusz Krzysztofik wrote:
    >
    > > + case SND_SOC_BIAS_ON:
    > > + case SND_SOC_BIAS_PREPARE:
    > > + if (IS_ERR(cx20442->por.regulator)) {
    > > + err = PTR_ERR(cx20442->por.regulator);
    > > + } else if (!cx20442->por.enabled) {
    > > + err = regulator_enable(cx20442->por.regulator);
    > > + if (!err)
    > > + cx20442->por.enabled = true;
    > > + }
    > > + break;
    > > + case SND_SOC_BIAS_STANDBY:
    > > + case SND_SOC_BIAS_OFF:
    > > + if (IS_ERR(cx20442->por.regulator)) {
    > > + err = PTR_ERR(cx20442->por.regulator);
    > > + } else if (cx20442->por.enabled) {
    > > + err = regulator_disable(cx20442->por.regulator);
    > > + if (!err)
    > > + cx20442->por.enabled = false;
    > > + }
    > > + }
    > > + mutex_unlock(&cx20442->por.lock);
    >
    > You can avoid the mutex and simplify the code by relying on the fact
    > that the only possible transitions are:
    >
    > OFF <-> STANDBY <-> PREPARE <-> ON
    >
    > which would look a lot more natural - you shouldn't need to remember if
    > the regulator is enabled, you should just turn it on in the STANDBY to
    > PREPARE transition and turn it off in the ON to PREPARE or PREPARE to
    > STANDBY transitions.

    Can I assume STANDBY or OFF at the time the codec .remove method is
    called? If not, is there a helper function available which can be called
    in order to perform all those ON -> PREPARE -> STANDBY [-> OFF] transitions before calling regulator_put()?

    Thanks,
    Janusz


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