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Date: Tue, 26 Sep 2017 22:55:26 -0700
From: Dmitry Torokhov <dtor@...omium.org>
To: Wei-Ning Huang <wnhuang@...omium.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Linux Input <linux-input@...r.kernel.org>,
Dmitry Torokhov <dtor@...omium.org>,
Jiri Kosina <jikos@...nel.org>,
Wei-Ning Huang <wnhuang@...gle.com>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
rydberg@...math.org
Subject: Re: [PATCH] HID: hid-multitouch: support fine-grain orientation reporting
Hi Wei-Ning,
On Tue, Sep 26, 2017 at 8:03 PM, Wei-Ning Huang <wnhuang@...omium.org> wrote:
>
> The current hid-multitouch driver only allow the report of two
> orientations, vertical and horizontal. We use the Azimuth orientation
> usage 0x5b under the Digitizer usage page to report orientation directly
> from the hid device. A new quirk MT_QUIRK_REPORT_ORIENTATION is added so
> user can enable this only if their device supports it.
The patch description is stale, there is no quirk anymore, and the
usage is 0x3f.
>
> Signed-off-by: Wei-Ning Huang <wnhuang@...gle.com>
> Reviewed-by: Dmitry Torokhov <dtor@...omium.org>
> ---
> drivers/hid/hid-multitouch.c | 38 ++++++++++++++++++++++++++++++++++++--
> include/linux/hid.h | 1 +
> 2 files changed, 37 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 440b999304a5..4663bf4b2892 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -84,11 +84,12 @@ MODULE_LICENSE("GPL");
> #define MT_IO_FLAGS_PENDING_SLOTS 2
>
> struct mt_slot {
> - __s32 x, y, cx, cy, p, w, h;
> + __s32 x, y, cx, cy, p, w, h, a;
> __s32 contactid; /* the device ContactID assigned to this slot */
> bool touch_state; /* is the touch valid? */
> bool inrange_state; /* is the finger in proximity of the sensor? */
> bool confidence_state; /* is the touch made by a finger? */
> + bool has_azimuth; /* the contact reports azimuth */
> };
>
> struct mt_class {
> @@ -591,6 +592,23 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
> td->cc_index = field->index;
> td->cc_value_index = usage->usage_index;
> return 1;
> + case HID_DG_AZIMUTH:
> + hid_map_usage(hi, usage, bit, max,
> + EV_ABS, ABS_MT_ORIENTATION);
> + /*
> + * Azimuth has the range of [0, MAX) representing a full
> + * revolution. Set ABS_MT_ORIENTATION to a quarter of
> + * MAX according the definition of ABS_MT_ORIENTATION
> + */
> + input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
> + 0, field->logical_maximum / 4,
> + cls->sn_move ?
> + field->logical_maximum / cls->sn_move : 0, 0);
> + input_abs_set_res(hi->input, ABS_MT_ORIENTATION,
> + hidinput_calc_abs_res(field,
> + ABS_MT_ORIENTATION));
I do not think resolution makes sense for ABS_MT_ORIENTATION. The MAX
always corresponds to 90 degrees.
> + mt_store_field(usage, td, hi);
> + return 1;
> case HID_DG_CONTACTMAX:
> /* we don't set td->last_slot_field as contactcount and
> * contact max are global to the report */
> @@ -683,6 +701,10 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
> int wide = (s->w > s->h);
> int major = max(s->w, s->h);
> int minor = min(s->w, s->h);
> + int orientation = wide;
> +
> + if (s->has_azimuth)
> + orientation = s->a;
>
> /*
> * divided by two to match visual scale of touch
> @@ -699,7 +721,8 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
> input_event(input, EV_ABS, ABS_MT_TOOL_Y, s->cy);
> input_event(input, EV_ABS, ABS_MT_DISTANCE,
> !s->touch_state);
> - input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide);
> + input_event(input, EV_ABS, ABS_MT_ORIENTATION,
> + orientation);
> input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p);
> input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
> input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
> @@ -789,6 +812,17 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
> break;
> case HID_DG_CONTACTCOUNT:
> break;
> + case HID_DG_AZIMUTH:
> + /*
> + * Azimuth is counter-clockwise and ranges from [0, MAX)
> + * (a full revolution). Convert it to clockwise ranging
> + * [-MAX/2, MAX/2].
Benjamin, Henrik, have you worked with devices reporting azimuth? I
assume MS HID spec uses 0 to represent due North, same as we have in
Linux:
https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/supporting-usages-in-digitizer-report-descriptors
> + */
> + if (value > field->logical_maximum / 2)
> + value -= field->logical_maximum;
> + td->curdata.a = -value;
> + td->curdata.has_azimuth = true;
> + break;
> case HID_DG_TOUCH:
> /* do nothing */
> break;
> diff --git a/include/linux/hid.h b/include/linux/hid.h
> index ab05a86269dc..d81b9b6fd83a 100644
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -281,6 +281,7 @@ struct hid_item {
>
> #define HID_DG_DEVICECONFIG 0x000d000e
> #define HID_DG_DEVICESETTINGS 0x000d0023
> +#define HID_DG_AZIMUTH 0x000d003f
> #define HID_DG_CONFIDENCE 0x000d0047
> #define HID_DG_WIDTH 0x000d0048
> #define HID_DG_HEIGHT 0x000d0049
> --
> 2.12.2
>
Thanks,
Dmitry
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