[Letux-kernel] LetuxOS: driver for bq24297 (Pyra charger)

[H. Nikolaus Schaller]

> Am 27.09.2018 um 16:52 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> Hi,
> the driver was unreliable to detect usb unplug and plug and (re)start charging.
> 
> So I did improve it in several areas:
> 
> 1. detect status flag (REG9/CHRG_FAULT) that tells if the power adapter was
>   unplugged even if the driver wasn't directly immediately VBUS

s/immediately/scanning/

>   (previously we checked only once a second for VBUS and a quick power drop wasn't
>   recognised by the driver code but made the charger chip change its state)
> 2. move all status flag detection into single place for interrupt handler/polling
>   (this avoids races and inconsistent reports to /sys)
> 3. fix presentation of VBUS to /sys if it is detected to be too low and the charger
>   goes into DPM (Dynamic Power Management i.e. self-limit current consumption) mode
> 4. fix coarse reporting of NTC temperature (don't expect too much: it has only 3
>   levels -10°C, 22.5°C, 60°C and no real ADC)
> 5. significant code cleanup to get rid of all static variables
> 
> I haven't committed the patches yet, but plan to do so for v4.19-rc6. Or maybe v4.18.11.
> Whatever will be processed first.
> 
> Attached is the full source file if you want to give it a try.
> It should work with 4.14 to 4.18 as well (I am not aware of API dependencies).

There is a small bug which makes detection fail again on the latest boards until
you plug in and remove an OTG cable... Please:

	s/GPIOD_OUT_HIGH/GPIOD_OUT_LOW/

in line 1138.

> 
> BR,
> Nikolaus
> 
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