linux-kernel - Re: [PATCH 3/3] HID: sensor-hub: don't limit the driver only to USB bus

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Date:	Mon, 18 Feb 2013 13:54:29 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Alexander Holler <holler@...oftware.de>
Cc:	linux-kernel@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>,
	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	linux-input@...r.kernel.org, srinivas.pandruvada@...el.com
Subject: Re: [PATCH 3/3] HID: sensor-hub: don't limit the driver only to USB
 bus

On Mon, Feb 18, 2013 at 12:37:52PM +0100, Alexander Holler wrote:
> Am 18.02.2013 12:33, schrieb Mika Westerberg:
> >On Mon, Feb 18, 2013 at 12:22:58PM +0100, Alexander Holler wrote:
> >>Am 18.02.2013 12:12, schrieb Mika Westerberg:
> >>>On Mon, Feb 18, 2013 at 12:03:04PM +0100, Alexander Holler wrote:
> >>>>Am 11.02.2013 11:31, schrieb Mika Westerberg:
> >>>>>We now have two transport mediums: USB and I2C, where sensor hubs can
> >>>>>exists. So instead of constraining the driver to only these two we let it
> >>>>>to match any HID bus as long as the group is HID_GROUP_SENSOR_HUB.
> >>>>>
> >>>>>Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> >>>>>---
> >>>>>  drivers/hid/hid-sensor-hub.c |    3 ++-
> >>>>>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>>>>
> >>>>>diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
> >>>>>index 2643bce9..c01f10d 100644
> >>>>>--- a/drivers/hid/hid-sensor-hub.c
> >>>>>+++ b/drivers/hid/hid-sensor-hub.c
> >>>>>@@ -603,7 +603,8 @@ static void sensor_hub_remove(struct hid_device *hdev)
> >>>>>  }
> >>>>>
> >>>>>  static const struct hid_device_id sensor_hub_devices[] = {
> >>>>>-	{ HID_DEVICE(BUS_USB, HID_GROUP_SENSOR_HUB, HID_ANY_ID, HID_ANY_ID) },
> >>>>>+	{ HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
> >>>>>+		     HID_ANY_ID) },
> >>>>>  	{ }
> >>>>>  };
> >>>>>  MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
> >>>>>
> >>>>
> >>>>Hmm, what happens with Bluetooth sensor-hubs? Is the driver now able
> >>>>to handle them too?
> >>>
> >>>It should, yes.
> >>
> >>If so, I think patch 1/3 should be modified accordingly.
> >
> >Do you know if such devices exists currently? If not, I'm not sure if it
> >makes sense to do that now.
> 
> The CC2541DK-SENSOR from TI looks like one. But I'm not sure as I
> don't have one. Besides that, I think Bluetooth (especially with
> BT4LE) will be by far the most used bus for sensors hubs.

OK, thanks.

In that case I think it's best to remove the explicit bus check from the
condition completely and rely on the fact that page == HID_UP_SENSOR.

Since Jiri already applied this patch, I can make an incremental patch
which removes the explicit bus check, if there are no objections.
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