path: root/Documentation/input
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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2009-05-08 18:29:27 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-05-08 18:29:27 -0700
commitd585a021c0b10b0477d6b608c53e1feb8cde0507 (patch)
tree5ca059da1db7f15d4b29427644ad9c08270c885c /Documentation/input
parent84e5b0d00f8f84c4ae226be131d4bebbcee88bd3 (diff)
parent091bf7624d1c90cec9e578a18529f615213ff847 (diff)
Merge commit 'v2.6.30-rc5' into next
Diffstat (limited to 'Documentation/input')
2 files changed, 205 insertions, 0 deletions
diff --git a/Documentation/input/bcm5974.txt b/Documentation/input/bcm5974.txt
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+BCM5974 Driver (bcm5974)
+ Copyright (C) 2008-2009 Henrik Rydberg <rydberg@euromail.se>
+The USB initialization and package decoding was made by Scott Shawcroft as
+part of the touchd user-space driver project:
+ Copyright (C) 2008 Scott Shawcroft (scott.shawcroft@gmail.com)
+The BCM5974 driver is based on the appletouch driver:
+ Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
+ Copyright (C) 2005 Johannes Berg (johannes@sipsolutions.net)
+ Copyright (C) 2005 Stelian Pop (stelian@popies.net)
+ Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de)
+ Copyright (C) 2005 Peter Osterlund (petero2@telia.com)
+ Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch)
+ Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch)
+This driver adds support for the multi-touch trackpad on the new Apple
+Macbook Air and Macbook Pro laptops. It replaces the appletouch driver on
+those computers, and integrates well with the synaptics driver of the Xorg
+Known to work on Macbook Air, Macbook Pro Penryn and the new unibody
+Macbook 5 and Macbook Pro 5.
+The driver loads automatically for the supported usb device ids, and
+becomes available both as an event device (/dev/input/event*) and as a
+mouse via the mousedev driver (/dev/input/mice).
+USB Race
+The Apple multi-touch trackpads report both mouse and keyboard events via
+different interfaces of the same usb device. This creates a race condition
+with the HID driver, which, if not told otherwise, will find the standard
+HID mouse and keyboard, and claim the whole device. To remedy, the usb
+product id must be listed in the mouse_ignore list of the hid driver.
+Debug output
+To ease the development for new hardware version, verbose packet output can
+be switched on with the debug kernel module parameter. The range [1-9]
+yields different levels of verbosity. Example (as root):
+echo -n 9 > /sys/module/bcm5974/parameters/debug
+tail -f /var/log/debug
+echo -n 0 > /sys/module/bcm5974/parameters/debug
+The driver was developed at the ubuntu forums in June 2008 [1], and now has
+a more permanent home at bitmath.org [2].
+[1] http://ubuntuforums.org/showthread.php?t=840040
+[2] http://http://bitmath.org/code/
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt
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+Multi-touch (MT) Protocol
+ Copyright (C) 2009 Henrik Rydberg <rydberg@euromail.se>
+In order to utilize the full power of the new multi-touch devices, a way to
+report detailed finger data to user space is needed. This document
+describes the multi-touch (MT) protocol which allows kernel drivers to
+report details for an arbitrary number of fingers.
+Anonymous finger details are sent sequentially as separate packets of ABS
+events. Only the ABS_MT events are recognized as part of a finger
+packet. The end of a packet is marked by calling the input_mt_sync()
+function, which generates a SYN_MT_REPORT event. The end of multi-touch
+transfer is marked by calling the usual input_sync() function.
+A set of ABS_MT events with the desired properties is defined. The events
+are divided into categories, to allow for partial implementation. The
+minimum set consists of ABS_MT_TOUCH_MAJOR, ABS_MT_POSITION_X and
+ABS_MT_POSITION_Y, which allows for multiple fingers to be tracked. If the
+device supports it, the ABS_MT_WIDTH_MAJOR may be used to provide the size
+of the approaching finger. Anisotropy and direction may be specified with
+more granular information may specify general shapes as blobs, i.e., as a
+sequence of rectangular shapes grouped together by an
+ABS_MT_BLOB_ID. Finally, the ABS_MT_TOOL_TYPE may be used to specify
+whether the touching tool is a finger or a pen or something else.
+Event Semantics
+The word "contact" is used to describe a tool which is in direct contact
+with the surface. A finger, a pen or a rubber all classify as contacts.
+The length of the major axis of the contact. The length should be given in
+surface units. If the surface has an X times Y resolution, the largest
+possible value of ABS_MT_TOUCH_MAJOR is sqrt(X^2 + Y^2), the diagonal.
+The length, in surface units, of the minor axis of the contact. If the
+contact is circular, this event can be omitted.
+The length, in surface units, of the major axis of the approaching
+tool. This should be understood as the size of the tool itself. The
+orientation of the contact and the approaching tool are assumed to be the
+The length, in surface units, of the minor axis of the approaching
+tool. Omit if circular.
+The above four values can be used to derive additional information about
+the contact. The ratio ABS_MT_TOUCH_MAJOR / ABS_MT_WIDTH_MAJOR approximates
+the notion of pressure. The fingers of the hand and the palm all have
+different characteristic widths [1].
+The orientation of the ellipse. The value should describe half a revolution
+clockwise around the touch center. The scale of the value is arbitrary, but
+zero should be returned for an ellipse aligned along the Y axis of the
+surface. As an example, an index finger placed straight onto the axis could
+return zero orientation, something negative when twisted to the left, and
+something positive when twisted to the right. This value can be omitted if
+the touching object is circular, or if the information is not available in
+the kernel driver.
+The surface X coordinate of the center of the touching ellipse.
+The surface Y coordinate of the center of the touching ellipse.
+The type of approaching tool. A lot of kernel drivers cannot distinguish
+between different tool types, such as a finger or a pen. In such cases, the
+event should be omitted. The protocol currently supports MT_TOOL_FINGER and
+The BLOB_ID groups several packets together into one arbitrarily shaped
+contact. This is a low-level anonymous grouping, and should not be confused
+with the high-level contactID, explained below. Most kernel drivers will
+not have this capability, and can safely omit the event.
+Finger Tracking
+The kernel driver should generate an arbitrary enumeration of the set of
+anonymous contacts currently on the surface. The order in which the packets
+appear in the event stream is not important.
+The process of finger tracking, i.e., to assign a unique contactID to each
+initiated contact on the surface, is left to user space; preferably the
+multi-touch X driver [3]. In that driver, the contactID stays the same and
+unique until the contact vanishes (when the finger leaves the surface). The
+problem of assigning a set of anonymous fingers to a set of identified
+fingers is a euclidian bipartite matching problem at each event update, and
+relies on a sufficiently rapid update rate.
+In order to stay compatible with existing applications, the data
+reported in a finger packet must not be recognized as single-touch
+events. In addition, all finger data must bypass input filtering,
+since subsequent events of the same type refer to different fingers.
+The first kernel driver to utilize the MT protocol is the bcm5974 driver,
+where examples can be found.
+[1] With the extension ABS_MT_APPROACH_X and ABS_MT_APPROACH_Y, the
+difference between the contact position and the approaching tool position
+could be used to derive tilt.
+[2] The list can of course be extended.
+[3] The multi-touch X driver is currently in the prototyping stage. At the
+time of writing (April 2009), the MT protocol is not yet merged, and the
+prototype implements finger matching, basic mouse support and two-finger
+scrolling. The project aims at improving the quality of current multi-touch
+functionality available in the synaptics X driver, and in addition
+implement more advanced gestures.