linux-kernel - Re: [PATCH] iio: accel: add missing sensor for some 2-in-1 based ultrabooks

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Message-ID: <55a52a4e-01d1-2f4c-25e3-0047537bef86@redhat.com>
Date:   Wed, 3 Apr 2019 11:10:49 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Luís Ferreira <luis@...orafoss.org>,
        jic23@...nel.org
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Stephan Gerhold <stephan@...hold.net>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iio: accel: add missing sensor for some 2-in-1 based
 ultrabooks

Hi,

On 02-04-19 18:04, Luís Ferreira wrote:
> Some ultrabooks, like Teclast F6 Pro, use KIOX010A sensor on display
> and KIOX020A sensor on keyboard base, to detect tablet mode or screen
> orientation.

I deliberately left out the KIOX020A id for now, because currently
userspace cannot really deal with having 2 sensors.

See:
https://github.com/systemd/systemd/issues/6557
https://github.com/hadess/iio-sensor-proxy/issues/166

Basically we need to come up with a convention to (optionally) indicate
the sensors location with a udev attribute set by:
/lib/udev/hwdb.d/60-sensor.hwdb

And then patch iio-sensor-proxy to consume that attribute and ignore
the one which has e.g. ACCEL_LOCATION=keyboard in its udev properties

Ignoring would be a first step, maybe later it can do something useful
with it, see e.g. :  https://github.com/alesguzik/linux_detect_tablet_mode

IMHO we really should minimally get code in place for iio-sensor-proxy
to ignore the keyboard accelerometer before merging this patch.

I realize that having the code in place will not magically get it on
all users machines, but I believe this is the minimum which needs to
happen before we push this out and potentially breaks people screen
rotation.

I've had working on this on my TODO list for a long long time now,
but -ENOTIME. If you have some time to work on this then that would
be great.

Regards,

Hans

> 
> Signed-off-by: Luís Ferreira <luis@...orafoss.org>
> ---
>   drivers/iio/accel/kxcjk-1013.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
> index 7096e577b23f..9a5e445facc1 100644
> --- a/drivers/iio/accel/kxcjk-1013.c
> +++ b/drivers/iio/accel/kxcjk-1013.c
> @@ -1492,6 +1492,7 @@ static const struct acpi_device_id kx_acpi_match[] = {
>   	{"KIOX0009", KXTJ21009},
>   	{"KIOX000A", KXCJ91008},
>   	{"KIOX010A", KXCJ91008}, /* KXCJ91008 inside the display of a 2-in-1 */
> +	{"KIOX020A", KXCJ91008},
>   	{"KXTJ1009", KXTJ21009},
>   	{"KXJ2109",  KXTJ21009},
>   	{"SMO8500",  KXCJ91008},
>