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Date: Sat, 28 Nov 2020 13:29:31 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: "Ye, Xiang" <xiang.ye@...el.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, jikos@...nel.org,
srinivas.pandruvada@...ux.intel.com, linux-input@...r.kernel.org,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] HID: hid-sensor-custom: Add custom sensor iio
support
On Wed, 25 Nov 2020 10:27:21 +0800
"Ye, Xiang" <xiang.ye@...el.com> wrote:
> On Tue, Nov 24, 2020 at 11:32:11AM +0000, Jonathan Cameron wrote:
> > Hi
> > ...
> > > > > sysfs_remove_group(&sensor_inst->pdev->dev.kobj,
> > > > > diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
> > > > > index 530c09f3e64a..46db3056f04b 100644
> > > > > --- a/include/linux/hid-sensor-ids.h
> > > > > +++ b/include/linux/hid-sensor-ids.h
> > > > > @@ -128,6 +128,10 @@
> > > > > #define HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND 0x15
> > > > >
> > > > > /* Common selectors */
> > > > > +#define HID_USAGE_SENSOR_PROP_DESC 0x200300
> > > > > +#define HID_USAGE_SENSOR_PROP_FRIENDLY_NAME 0x200301
> > > > > +#define HID_USAGE_SENSOR_PROP_SERIAL_NUM 0x200307
> > > > > +#define HID_USAGE_SENSOR_PROP_MANUFACTURER 0x200305
> > > > > #define HID_USAGE_SENSOR_PROP_REPORT_INTERVAL 0x20030E
> > > > > #define HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS 0x20030F
> > > > > #define HID_USAGE_SENSOR_PROP_SENSITIVITY_RANGE_PCT 0x200310
> > > > > @@ -159,4 +163,39 @@
> > > > > #define HID_USAGE_SENSOR_PROP_REPORTING_STATE_NO_EVENTS_ENUM 0x200840
> > > > > #define HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM 0x200841
> > > > >
> > > > > +/* Custom Sensor (2000e1) */
> > > > > +#define HID_USAGE_SENSOR_HINGE 0x20020B
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_LOCATION 0x200400
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELE_TIME_SINCE_SYS_BOOT 0x20052B
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_USAGE 0x200541
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE 0x200543
> > > > Given these are all defined in a block could we use a macro?
> > > > HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(x) 0x200543 + (x)
> > > >
> > > > perhaps?
> > > >
> > > > I'm not sure what the preferred convention is in this file.
> > > If using HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(x), we should give a range to x, like (1<x<28).
> > > How to ensure the x is in the range? It can be an issue when someone using x out of the range.
> >
> > It can be done via build time checking.
> > https://elixir.bootlin.com/linux/latest/source/include/linux/build_bug.h#L49
> > Normally we wouldn't bother and would rely on review to pick up on this but
> > I'd have no problem with a paranoid check in the macro. Particularly as 28 isn't
> > exactly and obvious number to support!
> Because HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE is used as case condition, we cannot use
> Build_BUG_ON in the macro like below.
> #define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(x) \
> ({ \
> BUILD_BUG_ON(x > 28); \
> BUILD_BUG_ON(x < 0); \
> (HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_BASE + (x)); \
> })
Ah. I'd missed the case condition element. Good point!
>
> I can use the define with a comments to declear the range of x.
> #define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_BASE 0x200543
> /* Custom Sensor data 28=>x>=0 */
> #define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(x) \
> (HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_BASE + (x))
>
Sounds good to me.
Thanks,
Jonathan
> Thanks
> Ye, Xiang
> >
> > >
> > > Thanks
> > > Xiang
> > > >
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_1 0x200544
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_2 0x200545
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_3 0x200546
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_4 0x200547
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_5 0x200548
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_6 0x200549
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_7 0x20054A
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_8 0x20054B
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_9 0x20054C
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_10 0x20054D
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_11 0x20054E
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_12 0x20054F
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_13 0x200550
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_14 0x200551
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_15 0x200552
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_16 0x200553
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_17 0x200554
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_18 0x200555
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_19 0x200556
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_20 0x200557
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_21 0x200558
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_22 0x200559
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_23 0x20055A
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_24 0x20055B
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_25 0x20055C
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_26 0x20055D
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_27 0x20055E
> > > > > +#define HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE_28 0x20055F
> > > > > +
> > > > > #endif
> > > >
> >
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