Re: [PATCH v2 06/11] HID: hid-multitouch: support T and C for win8 devices
From: Henrik Rydberg <hidden>
Date: 2012-10-29 21:56:25
Also in:
lkml
Hi Benjamin,
Win8 input specification clarifies the X and Y sent by devices. It distincts the position where the user wants to Touch (T) from the center of the ellipsoide (C). This patch enable supports for this distinction in hid-multitouch. We recognize Win8 certified devices from their vendor feature 0xff0000c5 where Microsoft put a signed blob in the report to check if the device passed the certification. Signed-off-by: Benjamin Tissoires <redacted> --- drivers/hid/hid-multitouch.c | 53 ++++++++++++++++++++++++++++++++++++-------- 1 file changed, 44 insertions(+), 9 deletions(-)
This is great, just a few comments below.
quoted hunk ↗ jump to hunk
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 41f2981..000c979 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c@@ -52,9 +52,10 @@ MODULE_LICENSE("GPL"); #define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 6) #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8) #define MT_QUIRK_NO_AREA (1 << 9) +#define MT_QUIRK_WIN_8_CERTIFIED (1 << 10) struct mt_slot { - __s32 x, y, p, w, h; + __s32 x, y, cx, cy, p, w, h; __s32 contactid; /* the device ContactID assigned to this slot */ bool touch_state; /* is the touch valid? */ };@@ -292,6 +293,10 @@ static void mt_feature_mapping(struct hid_device *hdev, td->maxcontacts = td->mtclass.maxcontacts; break; + case 0xff0000c5: + if (field->report_count == 256 && field->report_size == 8) + td->mtclass.quirks |= MT_QUIRK_WIN_8_CERTIFIED; + break; } }@@ -350,18 +355,36 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, case HID_UP_GENDESK: switch (usage->hid) { case HID_GD_X: - hid_map_usage(hi, usage, bit, max, + if (cls->quirks & MT_QUIRK_WIN_8_CERTIFIED &&
Parenthesis, please. Precedence is not always enough.
+ usage_index) {
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_TOOL_X);
+ set_abs(hi->input, ABS_MT_TOOL_X, field,
+ cls->sn_move);
+ } else {
+ hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_X);
- set_abs(hi->input, ABS_MT_POSITION_X, field,
- cls->sn_move);
+ set_abs(hi->input, ABS_MT_POSITION_X, field,
+ cls->sn_move);
+ }
+Do we really want to do the latter several times, even if the device is not a win8 one?
mt_store_field(usage, td, hi); td->last_field_index = field->index; return 1; case HID_GD_Y: - hid_map_usage(hi, usage, bit, max, + if (cls->quirks & MT_QUIRK_WIN_8_CERTIFIED &&
Ditto.
+ usage_index) {
+ hid_map_usage(hi, usage, bit, max,
+ EV_ABS, ABS_MT_TOOL_Y);
+ set_abs(hi->input, ABS_MT_TOOL_Y, field,
+ cls->sn_move);
+ } else {
+ hid_map_usage(hi, usage, bit, max,
EV_ABS, ABS_MT_POSITION_Y);
- set_abs(hi->input, ABS_MT_POSITION_Y, field,
- cls->sn_move);
+ set_abs(hi->input, ABS_MT_POSITION_Y, field,
+ cls->sn_move);
+ }
+Ditto.
quoted hunk ↗ jump to hunk
mt_store_field(usage, td, hi); td->last_field_index = field->index; return 1;@@ -502,6 +525,12 @@ static void mt_complete_slot(struct mt_device *td, struct input_dev *input) input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x); input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y); + if (td->mtclass.quirks & MT_QUIRK_WIN_8_CERTIFIED) { + input_event(input, EV_ABS, ABS_MT_TOOL_X, + s->cx);
Won't this fit on one line?
quoted hunk ↗ jump to hunk
+ input_event(input, EV_ABS, ABS_MT_TOOL_Y, + s->cy); + } input_event(input, EV_ABS, ABS_MT_ORIENTATION, wide); input_event(input, EV_ABS, ABS_MT_PRESSURE, s->p); input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);@@ -553,10 +582,16 @@ static int mt_event(struct hid_device *hid, struct hid_field *field, td->curdata.p = value; break; case HID_GD_X: - td->curdata.x = value; + if (usage->code == ABS_MT_POSITION_X) + td->curdata.x = value; + else + td->curdata.cx = value;
Since cx is the new value, reversing the logic would make sense here.
break; case HID_GD_Y: - td->curdata.y = value; + if (usage->code == ABS_MT_POSITION_Y) + td->curdata.y = value; + else + td->curdata.cy = value; break; case HID_DG_WIDTH: td->curdata.w = value; -- 1.7.11.7
Thanks, Henrik