linux-toradex.git/drivers/extcon/extcon-arizona.c, branch v3.12.28

extcon: arizona: Use power efficient workqueue

2013-08-04T23:53:34+00:00

None of the delayed work the driver schedules has particularly short delays
and it is not performance sensitive so let the scheduler run it wherever
is most efficient rather than in a per CPU workqueue by using the system
power efficient workqueue.

Signed-off-by: Mark Brown 
Signed-off-by: Chanwoo Choi 
Signed-off-by: Myungjoo Ham

extcon: arizona: Make mic detection timeout configurable

2013-04-02T10:54:07+00:00

Signed-off-by: Mark Brown

extcon: arizona: Allow additional debounce during microphone detection

2013-04-02T10:54:06+00:00

Help mitigate against mechanical bounce during the initial detection by
allowing the configuration of an additional debounce on top of that the
hardware does during the initial phase of microphone detection operation.

Signed-off-by: Mark Brown

extcon: arizona: Clear existing button reports before reporting new one

2013-04-02T10:54:05+00:00

If the user moves directly from one button to another then we won't get a
no buttons pressed event and will therefore end up reporting that two
buttons are simultaneously pressed which isn't supported by the hardware.
Make sure we clear any existing button reports before reporting any new
ones.

Signed-off-by: Mark Brown

extcon: arizona: Time out if MICDET fails to report

2013-04-02T10:54:03+00:00

In pathological cases the microphone detection may fail to report, for
example due to a failure to get a stable measurement. Provide a timeout
to cover such cases.

Signed-off-by: Mark Brown

extcon: arizona: Simplify HPDET based identification

2013-04-02T10:54:02+00:00

Rather than measuring both HP channels we can simply directly measure the
microphone impedance and then rely on MICDET for final confirmation of the
presence of a suitable microphone. This improves the overall performance
of the identification process.

Signed-off-by: Mark Brown

extcon: arizona: Don't ground flip when using HPDET identification

2013-04-02T10:54:01+00:00

This extra check makes the procedure take longer and is of marginal use
in identification so do not execute it.

Signed-off-by: Mark Brown

extcon: arizona: Retry HPDET identification for high impedance

2013-04-02T10:54:00+00:00

Sometimes we can trigger measurements early if contacts are shorted during
a slow insertion. As well as debouncing add further robustness by retrying
if we get a high impedance measurement for headphones as this can indicate
that the headphones were not yet connected.

Signed-off-by: Mark Brown

extcon: arizona: Tune up HPDET debounce

2013-04-02T10:53:58+00:00

Signed-off-by: Mark Brown

extcon: arizona: Check we report a valid impedance

2013-04-02T10:53:57+00:00

Occasionally we can trigger an interrupt before we have completed
impedance measurement, although the valid bit will still be set. This
patch spins reading the impedance value until a valid value is seen.

Signed-off-by: Charles Keepax 
Signed-off-by: Mark Brown