linux-kernel - Re: [PATCH] HID: sensor-hub: Enable hid core report processing for all devices

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Date: Fri, 22 Dec 2023 04:43:34 -0800
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Yauhen Kharuzhy <jekhor@...il.com>, Jonathan Cameron <jic23@...nel.org>
Cc: linux-input@...r.kernel.org, linux-iio@...r.kernel.org, Daniel Thompson
	 <daniel.thompson@...aro.org>, linux-kernel@...r.kernel.org, Jiri Kosina
	 <jikos@...nel.org>, Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: Re: [PATCH] HID: sensor-hub: Enable hid core report processing for
 all devices

On Wed, 2023-12-20 at 17:04 +0200, Yauhen Kharuzhy wrote:
> ср, 20 дек. 2023 г. в 16:52, Jonathan Cameron <jic23@...nel.org>:
> > 
> > On Wed, 20 Dec 2023 01:15:03 +0200
> > Yauhen Kharuzhy <jekhor@...il.com> wrote:
> > 
> > > After the commit 666cf30a589a ("HID: sensor-hub: Allow multi-
> > > function
> > > sensor devices") hub devices are claimed by hidraw driver in
> > > hid_connect().
> > > This causes stoppping of processing HID reports by hid core due
> > > to
> > > optimization.
> > > 
> > > In such case, the hid-sensor-custom driver cannot match a known
> > > custom
> > > sensor in hid_sensor_custom_get_known() because it try to check
> > > custom
> > > properties which weren't filled from the report because hid core
> > > didn't
> > > parsed it.
> > > 
> > > As result, custom sensors like hinge angle sensor and LISS
> > > sensors
> > > don't work.
> > > 
> > > Mark the sensor hub devices claimed by some driver to avoid
> > > hidraw-related
> > > optimizations.
> > > 
> > > Signed-off-by: Yauhen Kharuzhy <jekhor@...il.com>
> > Fixes tag?
> 
> Fixes: 666cf30a589a ("HID: sensor-hub: Allow multi-function sensor
> devices")
> 
This flag causes
 		hdev->claimed |= HID_CLAIMED_DRIVER;
I don't see the flag is used anywhere after this assignment in hid
core. Only two other drivers are setting this flag. We need Jiri's help
here why this is a special case.

Thanks,
Srinivas

> > 
> > > ---
> > >  drivers/hid/hid-sensor-hub.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-
> > > sensor-hub.c
> > > index 2eba152e8b90..26e93a331a51 100644
> > > --- a/drivers/hid/hid-sensor-hub.c
> > > +++ b/drivers/hid/hid-sensor-hub.c
> > > @@ -632,7 +632,7 @@ static int sensor_hub_probe(struct hid_device
> > > *hdev,
> > >       }
> > >       INIT_LIST_HEAD(&hdev->inputs);
> > > 
> > > -     ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
> > > +     ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT |
> > > HID_CONNECT_DRIVER);
> > >       if (ret) {
> > >               hid_err(hdev, "hw start failed\n");
> > >               return ret;
> > 
> 
>