On Wed, Jun 29, 2011 at 11:48 AM, Daniel Kurtz <djkurtz@xxxxxxxxxxxx> wrote: > Hi Chris, > > Thanks for taking a look! > > On Wed, Jun 29, 2011 at 9:28 PM, Chris Bagwell <chris@xxxxxxxxxxxxxx> wrote: >> On Wed, Jun 29, 2011 at 12:07 AM, <djkurtz@xxxxxxxxxxxx> wrote: >>> From: Daniel Kurtz <djkurtz@xxxxxxxxxxxx> >>> >>> Synaptics touchpads report a 'w' value in each data report. >>> For touchpads that support palm detection, when there is a single finger >>> on the pad, the 'w' value reports its width in the range 4 to 15. >>> Thus, the minimum valid width is 4. >> >> FYI: I had debated on this as well. When driver was first modified to >> report min/max width, the min width of zero was chosen because when >> not touching the pad a value of zero is forced by driver to user. So >> the range is 0, 4-15. > > Yup, good catch. I now see that this is true for the legacy single-touch case. > For consistency with the existing implementation, I'm ok to drop this patch. > > I think we can still keep the range 4-15 for the ABS_MT_TOUCH_MAJOR > axis, though, right? > A pure-mt userspace app can get the correct width range, and deduce 0 > fingers from the fact that all MT-B slots have tracking_id == -1. Yeah, at least I'd consider it an app bug. For that matter, it should be true of ABS_TOOL_WIDTH as well (we could change to always send minimum 4 as apart of this patch). Since we are on it, maybe a year ago I tested a version of this patch and notice xf86-input-synaptics defaulted to non-useful value for EmulateTwoFingerMinW because of the scale change. The xf86-input-synaptics logic in question has since be modified/reverted so I think thats not an issue anymore. I found no issues with apps see'ing ABS_TOOL_WIDTH >= 4 always. Chris > > -Dan > >>> >>> Note: Other values of 'w' are used to report special conditions: >>> w=0: 2 fingers are on the pad >>> w=1: 3 or more fingers are on the pad >>> w=2: the packet contains "Advanced Gesture Mode" data. >>> >>> Signed-off-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx> >>> --- >>> drivers/input/mouse/synaptics.c | 2 +- >>> 1 files changed, 1 insertions(+), 1 deletions(-) >>> >>> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c >>> index f6d0c04..a4b7801 100644 >>> --- a/drivers/input/mouse/synaptics.c >>> +++ b/drivers/input/mouse/synaptics.c >>> @@ -706,7 +706,7 @@ static void set_input_params(struct input_dev *dev, struct synaptics_data *priv) >>> } >>> >>> if (SYN_CAP_PALMDETECT(priv->capabilities)) >>> - input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0); >>> + input_set_abs_params(dev, ABS_TOOL_WIDTH, 4, 15, 0, 0); >>> >>> __set_bit(EV_KEY, dev->evbit); >>> __set_bit(BTN_TOUCH, dev->keybit); >>> -- >>> 1.7.3.1 >>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-input" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-input" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
