Hi Gregor,
Thank you for reply!
As I mentioned in linux-input@How to use ACPI for touchscreen - the acpi
provided info looks like total false.
For the begining I am trying to achieve mimimal - detect chip and just wake
up it.
Actually have tried - modified your driver for gsl1680 and also icn8318 for
acpi CHPN0001 - looks like it is working with just finding CHPN0001 but I
could not wake up chip, as far as I am understanding wakeuping process -
after wake up chip should be permanently visible to i2cdetect 4 on 0x048 -
but it not happen so - only from time to time.
Registers data is different between icn8318 and 85xx.
I also belive that all is need is - wakeup chip + load its firmware (I
have it) and also described in linux input case how it works I guess
indirect provs this too - so there is no need to wright from scratch driver
with registering int, intprocessing function and so on, but at the moment
I am not sure, it is only my guessing.
Anyway even without INT just polling mode will be also good. ;-) any
working solution even not perfect better than nothing!
Regards,
Serge Kolotylo.
On Tuesday, March 1, 2016 at 10:24:05 AM UTC, Gregor Riepl wrote:
>
> > 1) How to initialize the chip? What is the sequence? It looks it is not
> enough
> > just set gpio to 1.
>
> I think many TS controllers use the same or a similar sequence to this:
> - Set wakeup pin low
> - Wait for a few ms
> - Set wakup pin high
>
> How long is probably chip dependant.
>
> > 2) Please describe in a few words the feature of linux-sunxi - what is
> > ctp_config_info and how input information goes to it.
> > for example in the mentioned above link there is such lines in icn83xx.c
>
> ctp_config is hardcoded crap and should not be in any proper driver, IMHO.
>
> That information is better fetched from 1) ACPI or DT, if available, 2)
> made
> available through sysfs, or 3) provided in the firmware.
>
> 1) silead_ts does this
> 2) chipone_icn8318 does this
> 3) gslx680-acpi does this
>
> 1) is probably the best option, but I don't really know if 2) or 3) is
> better
> when 1) is not available. 2) requires user space interaction and 3)
> requires
> specially formatted firmware.
>
> Can you compare the actual I2C and GPIO code from chipone_icn8318 and
> icn85xx.c and see if the work similarly? In that case, I believe we could
> just
> add ACPI support and the correct ACPI IDs for your icn85xx to
> chipone_icn8318
> and it should start working. Well, you still need proper firmware, I
> guess.
> But let's leave that aside for now.
>
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