Re: [PATCH v4] hid-multitouch: migrate 3M PCT touch screens to hid-multitouch

On Tue, 22 Mar 2011, Henrik Rydberg wrote:

On Tue, Mar 22, 2011 at 05:34:01PM +0100, Benjamin Tissoires wrote:

quoted

This patch merges the hid-3m-pct driver into hid-multitouch.
To keep devices working the same way they used to with hid-3m-pct,
we need to add two signal/noise ratios for width and height.
We also need to work on width/height to send proper
ABS_MT_ORIENTATION flag.

Importing 3M into hid-multitouch also solved the bug in which
devices handling width and height in their report descriptors
did not show ABS_MT_TOUCH_MAJOR and ABS_MT_TOUCH_MINOR.

Signed-off-by: Benjamin Tissoires <redacted>
Reviewed-by: Stéphane Chatty <redacted>
---

[...]

quoted

Henrik, do I still have your Reviewed-and-tested-by ?

Yep, looks good. One more thing, though:

quoted

@@ -332,11 +351,18 @@ static void mt_emit_event(struct mt_device *td, struct input_dev *input)
 		input_mt_report_slot_state(input, MT_TOOL_FINGER,
 			s->touch_state);
 		if (s->touch_state) {
+			/* this finger is on the screen */
+			int wide = (s->w > s->h);
+			/* divided by two to match visual scale of touch */
+			int major = max(s->w, s->h) >> 1;
+			int minor = min(s->w, s->h) >> 1;

This scaling is most likely not correct for all devices. I went
through a set of devices some time ago, running mtview on all of them,
visually inspecting the touch size. Some were low by a factor of two,
some were high by a factor of two. A confirmation that the other
devices supported by this driver seem right would be good. If not, a
quirk should probably be added here.

Okay, thanks a lot for the review. This can be handled later during 
-rc phase if needed. So please proceed with confirming with the existing 
devices, and meanwhile I have applied the patch.

quoted

+
 			input_event(input, EV_ABS, ABS_MT_POSITION_X, s->x);
 			input_event(input, EV_ABS, ABS_MT_POSITION_Y, s->y);
+			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, s->w);
-			input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, s->h);
+			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, major);
+			input_event(input, EV_ABS, ABS_MT_TOUCH_MINOR, minor);
 		}
 		s->seen_in_this_frame = false;

Thanks,

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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