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    SubjectRe: [PATCH v3 7/9] input: elants: support 0x66 reply opcode for reporting touches
    On Mon, Apr 13, 2020 at 03:32:26PM +0200, Michał Mirosław wrote:
    > From: Dmitry Osipenko <digetx@gmail.com>
    >
    > 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.
    >
    > Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
    > Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
    > Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
    > ---
    > drivers/input/touchscreen/elants_i2c.c | 11 ++++++++++-
    > 1 file changed, 10 insertions(+), 1 deletion(-)
    >
    > diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
    > index 2b936e920874..9751139e8507 100644
    > --- a/drivers/input/touchscreen/elants_i2c.c
    > +++ b/drivers/input/touchscreen/elants_i2c.c
    > @@ -60,6 +60,15 @@
    > #define QUEUE_HEADER_NORMAL 0X63
    > #define QUEUE_HEADER_WAIT 0x64
    >
    > +/*
    > + * Depending on firmware version, eKTF3624 touchscreens may utilize one of
    > + * these opcodes for the touch events: 0x63 and 0x66. The 0x63 is used by
    > + * older firmware version and differs from 0x66 such that touch pressure
    > + * value needs to be adjusted.

    Who is responsible for the adjustment? Where does it happen?

    Thanks.

    --
    Dmitry

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