Hi Henrik,
On Wed, Feb 20, 2013 at 10:55:13PM +0100, Henrik Rydberg wrote:
> Hi Chung-yih,
>
> > The profile sensor clickpad in a Cr-48 Chromebook does a reasonable job of
> > tracking individual fingers. This tracking isn't perfect, but, experiments
> > show that it works better than just passing "semi-mt" data to userspace,
> > and making userspace try to deduce where the fingers are given a bounding box.
> >
> > This patch tries to report two-finger positions directly from firmware's sgm
> > and agm packets instead of the {(min_x, min_y), (max_x, max_y)} for profile
> > sensor clickpads on Cr-48 chromebooks. Note that this device's firmware always
> > reports the higher (smaller y) finger in the "sgm" packet, and the lower
> > (larger y) finger in the "agm" packet for the state transition from one finger
> > to two finger. Then the firmware keeps tracking of fingers with the same agm
> > or sgm packets individually. Thus, when a new finger arrives on the pad, the
> > kernel driver uses a simple Euclidean distance measure to deduce which of the
> > two new fingers should keep the tracking ID of the previous single finger.
> > Similarly, when one finger is removed, the same measure is used to determine
> > which finger remained on the pad.
> >
> > Signed-off-by: Chung-yih Wang <cywang@xxxxxxxxxxxx>
> > ---
> > drivers/input/mouse/synaptics.c | 95 +++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 95 insertions(+)
>
> I looks right per se, but the procedure is a bit more manual than it
> needs to be. The input core can handle slot allocation these days, so
> I wonder if the the two patches below work for you, as an
> alternative?
You forgot to tell input_mt_init_slots() to track the contacts, but
otherwise it works. The version of the patch below seems to work well on
Cr-48 for me.
Thanks.
--
Dmitry
Input: synaptics - use firmware data for Cr-48
From: Henrik Rydberg <rydberg@xxxxxxxxxxx>
The profile sensor clickpad in a Cr-48 Chromebook does a reasonable job
of tracking individual fingers. This tracking isn't perfect, but,
experiments show that it works better than just passing "semi-mt" data
to userspace, and making userspace try to deduce where the fingers are
given a bounding box.
This patch tries to report correct two-finger positions instead of the
{(min_x, min_y), (max_x, max_y)} for profile sensor clickpads on Cr-48
chromebooks. Note that this device's firmware always reports the higher
(smaller y) finger in the "sgm" packet, and the lower (larger y) finger
in the "agm" packet. Thus, when a new finger arrives on the pad, the
kernel driver uses input core's contact tracking facilities to match
contacts with slots.
Inspired by patch by Daniel Kurtz <djkurtz@xxxxxxxxxxxx> and Chung-yih
Wang <cywang@xxxxxxxxxxxx>
Signed-off-by: Henrik Rydberg <rydberg@xxxxxxxxxxx>
Reviewed-by: Benson Leung <bleung@xxxxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/input/mouse/synaptics.c | 69 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 67 insertions(+), 2 deletions(-)
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index fe607e9..f261db9 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -67,6 +67,8 @@
#define X_MAX_POSITIVE 8176
#define Y_MAX_POSITIVE 8176
+static bool cr48_profile_sensor;
+
/*****************************************************************************
* Stuff we need even when we do not want native Synaptics support
****************************************************************************/
@@ -1152,6 +1154,42 @@ static void synaptics_image_sensor_process(struct psmouse *psmouse,
priv->agm_pending = false;
}
+static void synaptics_profile_sensor_process(struct psmouse *psmouse,
+ struct synaptics_hw_state *sgm,
+ int num_fingers)
+{
+ struct input_dev *dev = psmouse->dev;
+ struct synaptics_data *priv = psmouse->private;
+ struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
+ struct input_mt_pos pos[2];
+ int slot[2], nsemi, i;
+
+ nsemi = clamp_val(num_fingers, 0, 2);
+
+ for (i = 0; i < nsemi; i++) {
+ pos[i].x = hw[i]->x;
+ pos[i].y = synaptics_invert_y(hw[i]->y);
+ }
+
+ input_mt_assign_slots(dev, slot, pos, nsemi);
+
+ for (i = 0; i < nsemi; i++) {
+ input_mt_slot(dev, slot[i]);
+ input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
+ input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
+ input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
+ input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
+ }
+
+ input_mt_drop_unused(dev);
+ input_mt_report_pointer_emulation(dev, false);
+ input_mt_report_finger_count(dev, num_fingers);
+
+ synaptics_report_buttons(psmouse, sgm);
+
+ input_sync(dev);
+}
+
/*
* called for each full received packet from the touchpad
*/
@@ -1215,6 +1253,11 @@ static void synaptics_process_packet(struct psmouse *psmouse)
finger_width = 0;
}
+ if (cr48_profile_sensor) {
+ synaptics_profile_sensor_process(psmouse, &hw, num_fingers);
+ return;
+ }
+
if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c))
synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
num_fingers);
@@ -1360,6 +1403,9 @@ static void set_input_params(struct psmouse *psmouse,
set_abs_position_params(dev, priv, ABS_X, ABS_Y);
input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
+ if (cr48_profile_sensor)
+ input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
+
if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
ABS_MT_POSITION_Y);
@@ -1373,9 +1419,14 @@ static void set_input_params(struct psmouse *psmouse,
} else if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)) {
set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
ABS_MT_POSITION_Y);
- /* Non-image sensors with AGM use semi-mt */
+ /*
+ * Profile sensor in CR-48 tracks contacts reasonably well,
+ * other non-image sensors with AGM use semi-mt.
+ */
input_mt_init_slots(dev, 2,
- INPUT_MT_POINTER | INPUT_MT_SEMI_MT);
+ INPUT_MT_POINTER |
+ (cr48_profile_sensor ?
+ INPUT_MT_TRACK : INPUT_MT_SEMI_MT));
}
if (SYN_CAP_PALMDETECT(priv->capabilities))
@@ -1577,10 +1628,24 @@ static const struct dmi_system_id olpc_dmi_table[] __initconst = {
{ }
};
+static const struct dmi_system_id __initconst cr48_dmi_table[] = {
+#if defined(CONFIG_DMI) && defined(CONFIG_X86)
+ {
+ /* Cr-48 Chromebook (Codename Mario) */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
+ },
+ },
+#endif
+ { }
+};
+
void __init synaptics_module_init(void)
{
impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
broken_olpc_ec = dmi_check_system(olpc_dmi_table);
+ cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
}
static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
--
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