Change the placement of __init and __exit annotations to be consistent
with the rest of the drivers.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Synaptics image sensor touchpads track up to 5 fingers, but only report 2.
They use a special "TYPE=2" (AGM-CONTACT) packet type that reports
the number of tracked fingers and which finger is reported in the SGM
and AGM packets.
With this new packet type, it is possible to tell userspace when 4 or 5
fingers are touching.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
"4-finger scroll" is a gesture supported by some applications and
operating systems.
"Resting thumb" is when a clickpad user rests a finger (e.g., a
thumb), in a "click zone" (typically the bottom of the touchpad) in
anticipation of click+move=select gestures.
Thus, "4-finger scroll + resting thumb" is a 5-finger gesture.
To allow userspace to detect this gesture, we send BTN_TOOL_QUINTTAP.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Synaptics image sensor touchpads track 5 fingers, but only report 2.
This patch attempts to deal with some idiosyncrasies of these touchpads:
* When there are 3 or more fingers, only two are reported.
* The touchpad tracks the 5 fingers in slot[0] through slot[4].
* It always reports the lowest and highest valid slots in SGM and AGM
packets, respectively.
* The number of fingers is only reported in the SGM packet. However,
the number of fingers can change either before or after an AGM
packet.
* Thus, if an SGM reports a different number of fingers than the last
SGM, it is impossible to tell whether the intervening AGM corresponds
to the old number of fingers or the new number of fingers.
* For example, when going from 2->3 fingers, it is not possible to tell
whether tell AGM contains slot[1] (old 2nd finger) or slot[2] (new
3rd finger).
* When fingers are added one at at time, from 1->2->3, it is possible to
track which slots are contained in the SGM and AGM packets:
1 finger: SGM = slot[0], no AGM
2 fingers: SGM = slot[0], AGM = slot[1]
3 fingers: SGM = slot[0], AGM = slot[2]
* It is also possible to track which slot is contained in the SGM when 1
of 2 fingers is removed. This is because the touchpad sends a special
(0,0,0) AGM packet whenever all fingers are removed except slot[0]:
Last AGM == (0,0,0): SGM contains slot[1]
Else: SGM contains slot[0]
* However, once there are 3 fingers, if exactly 1 finger is removed, it
is impossible to tell which 2 slots are contained in SGM and AGM.
The (SGM,AGM) could be (0,1), (0,2), or (1,2). There is no way to know.
* Similarly, if two fingers are simultaneously removed (3->1), then it
is only possible to know if SGM still contains slot[0].
* Since it is not possible to reliably track which slot is being
reported, we invalidate the tracking_id every time the number of
fingers changes until this ambiguity is resolved when:
a) All fingers are removed.
b) 4 or 5 fingers are touched, generates an AGM-CONTACT packet.
c) All fingers are removed except slot[0]. In this special case, the
ambiguity is resolved since by the (0,0,0) AGM packet.
Behavior of the driver:
When 2 or more fingers are present on the touchpad, the kernel reports
up to two MT-B slots containing the position data for two of the fingers
reported by the touchpad. If the identity of a finger cannot be tracked
when the number-of-fingers changes, the corresponding MT-B slot will be
invalidated (track_id set to -1), and a new track_id will be assigned in
a subsequent input event report.
The driver always reports the total number of fingers using one of the
EV_KEY/BTN_TOOL_*TAP events. This could differ from the number of valid
MT-B slots for two reasons:
a) There are more than 2 fingers on the pad.
b) During ambiguous number-of-fingers transitions, the correct track_id
for one or both of the slots cannot be determined, so the slots are
invalidated.
Thus, this is a hybrid singletouch/MT-B scheme. Userspace can detect
this behavior by noting that the driver supports more EV_KEY/BTN_TOOL_*TAP
events than its maximum EV_ABS/ABS_MT_SLOT.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
A Synaptics image sensor tracks 5 fingers, but can only report 2.
The algorithm for choosing which 2 fingers to report and in which packet:
Touchpad maintains 5 slots, numbered 0 to 4
Initially all slots are empty
As new fingers are detected, assign them to the lowest available slots
The touchpad always reports:
SGM: lowest numbered non-empty slot
AGM: highest numbered non-empty slot, if there is one
In addition, these touchpads have a special AGM packet type which reports
the number of fingers currently being tracked, and which finger is in
each of the two slots. Unfortunately, these "TYPE=2" packets are only used
when more than 3 fingers are being tracked. When less than 4 fingers
are present, the 'w' value must be used to track how many fingers are
present, and knowing which fingers are being reported is much more
difficult, if not impossible.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Synaptics makes (at least) two kinds of touchpad sensors:
* Older pads use a profile sensor that could only infer the location
of individual fingers based on the projection of their profiles
onto row and column sensors.
* Newer pads use an image sensor that can track true finger position
using a two-dimensional sensor grid.
Both sensor types support an "Advanced Gesture Mode":
When multiple fingers are detected, the touchpad sends alternating
"Advanced Gesture Mode" (AGM) and "Simple Gesture Mode" (SGM)
packets.
The AGM packets have w=2, and contain reduced resolution finger data
The SGM packets have w={0,1} and contain full resolution finger data
Profile sensors try to report the "upper" (larger y value) finger in
the SGM packet, and the lower (smaller y value) in the AGM packet.
However, due to the nature of the profile sensor, they easily get
confused when fingers cross, and can start reporting the x-coordinate
of one with the y-coordinate of the other. Thus, for profile
sensors, "semi-mt" was created, which reports a "bounding box"
created by pairing min and max coordinates of the two pairs of
reported fingers.
Image sensors can report the actual coordinates of two of the fingers
present. This patch detects if the touchpad is an image sensor and
reports finger data using the MT-B protocol.
NOTE: This patch only adds partial support for 2-finger gestures.
The proper interpretation of the slot contents when more than
two fingers are present is left to later patches. Also,
handling of 'number of fingers' transitions is incomplete.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
When a Synaptics touchpad is in "AGM" mode, and multiple fingers are
detected, the touchpad sends alternating "Advanced Gesture Mode" (AGM) and
"Simple Gesture Mode" (SGM) packets.
The AGM packets have w=2, and contain reduced resolution finger data.
The SGM packets have w={0,1} and contain full resolution finger data.
Refactor the parsing of agm packets to its own function, and rename the
synaptics_data.mt field to .agm to indicate that it contains the contents of
the last agm packet.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Synaptics touchpads report increasing y from bottom to top.
This is inverted from normal userspace "top of screen is 0" coordinates.
Thus, the kernel driver reports inverted y coordinates to userspace.
This patch refactors this inversion.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Since touchscreen driver does not handle any events to be sent to the
device we can close serio port first and then unregister the input device.
Tested-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Implement open() and close() methods for the input device so that we
do not start the device unless there are users listening to the events.
Acked-by: Chris Bagwell <chris@cnpbagwell.com>
Tested-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
