Re: [PATCH v5 07/10] input: elants: support 0x66 reply opcode for reporting touches

[Dmitry Torokhov]

On Sun, Apr 26, 2020 at 07:47:52PM +0200, MichaÅ MirosÅaw wrote:
> From: Dmitry Osipenko <digetx@xxxxxxxxx>
> 
> eKTF3624 touchscreen firmware uses two variants of the reply opcodes for
> reporting touch events: one is 0x63 (used by older firmware) and other is
> 0x66 (used by newer firmware). The 0x66 variant is equal to 0x63 of
> eKTH3500, while 0x63 needs small adjustment of the touch pressure value.
> 
> Nexus 7 tablet device has eKTF3624 touchscreen and it uses 0x66 opcode for
> reporting touch events, let's support it now. Other devices, eg. ASUS TF300T,
> use 0x63.
> 
> Note: CMD_HEADER_REK is used for replying to calibration requests, it has
> the same 0x66 opcode number which eKTF3624 uses for reporting touches.
> The calibration replies are handled separately from the the rest of the
> commands in the driver by entering into ELAN_WAIT_RECALIBRATION state
> and thus this change shouldn't change the old behavior.

Is it possible to know what format a device will use by querying it at
probe time?

Thanks.

-- 
Dmitry