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[PATCH] USB: add apple usb touchpad driver
This is a driver for the USB touchpad which can be found on post-February 2005
Apple PowerBooks.
This driver is derived from Johannes Berg's appletrackpad driver [1],
but it has been improved in some areas:
* appletouch is a full kernel driver, no userspace program is necessary
* appletouch can be interfaced with the synaptics X11 driver[2], in order
to have touchpad acceleration, scrolling, two/three finger tap, etc.
This driver has been tested by the readers of the 'debian-powerpc' mailing
list for a few weeks now and I believe it is now ready for inclusion into the
mainline kernel.
Credits go to Johannes Berg for reverse-engineering the touchpad protocol,
Frank Arnold for further improvements, and Alex Harper for some additional
information about the inner workings of the touchpad sensors.
Signed-off-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stelian Pop
Greg Kroah-Hartman
parent
1bbb4f2035
commit
f7214ff4e8
84
Documentation/input/appletouch.txt
Normal file
84
Documentation/input/appletouch.txt
Normal file
@ -0,0 +1,84 @@
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Apple Touchpad Driver (appletouch)
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----------------------------------
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Copyright (C) 2005 Stelian Pop <stelian@popies.net>
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appletouch is a Linux kernel driver for the USB touchpad found on post
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February 2005 Apple Alu Powerbooks.
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This driver is derived from Johannes Berg's appletrackpad driver[1], but it has
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been improved in some areas:
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* appletouch is a full kernel driver, no userspace program is necessary
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* appletouch can be interfaced with the synaptics X11 driver, in order
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to have touchpad acceleration, scrolling, etc.
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Credits go to Johannes Berg for reverse-engineering the touchpad protocol,
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Frank Arnold for further improvements, and Alex Harper for some additional
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information about the inner workings of the touchpad sensors.
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Usage:
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------
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In order to use the touchpad in the basic mode, compile the driver and load
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the module. A new input device will be detected and you will be able to read
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the mouse data from /dev/input/mice (using gpm, or X11).
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In X11, you can configure the touchpad to use the synaptics X11 driver, which
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will give additional functionalities, like acceleration, scrolling, 2 finger
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tap for middle button mouse emulation, 3 finger tap for right button mouse
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emulation, etc. In order to do this, make sure you're using a recent version of
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the synaptics driver (tested with 0.14.2, available from [2]), and configure a
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new input device in your X11 configuration file (take a look below for an
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example). For additional configuration, see the synaptics driver documentation.
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Section "InputDevice"
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Identifier "Synaptics Touchpad"
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Driver "synaptics"
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Option "SendCoreEvents" "true"
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Option "Device" "/dev/input/mice"
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Option "Protocol" "auto-dev"
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Option "LeftEdge" "0"
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Option "RightEdge" "850"
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Option "TopEdge" "0"
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Option "BottomEdge" "645"
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Option "MinSpeed" "0.4"
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Option "MaxSpeed" "1"
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Option "AccelFactor" "0.02"
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Option "FingerLow" "0"
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Option "FingerHigh" "30"
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Option "MaxTapMove" "20"
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Option "MaxTapTime" "100"
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Option "HorizScrollDelta" "0"
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Option "VertScrollDelta" "30"
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Option "SHMConfig" "on"
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EndSection
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Section "ServerLayout"
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...
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InputDevice "Mouse"
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InputDevice "Synaptics Touchpad"
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...
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EndSection
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Fuzz problems:
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--------------
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The touchpad sensors are very sensitive to heat, and will generate a lot of
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noise when the temperature changes. This is especially true when you power-on
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the laptop for the first time.
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The appletouch driver tries to handle this noise and auto adapt itself, but it
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is not perfect. If finger movements are not recognized anymore, try reloading
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the driver.
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You can activate debugging using the 'debug' module parameter. A value of 0
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deactivates any debugging, 1 activates tracing of invalid samples, 2 activates
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full tracing (each sample is being traced):
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modprobe appletouch debug=1
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or
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echo "1" > /sys/module/appletouch/parameters/debug
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Links:
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------
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[1]: http://johannes.sipsolutions.net/PowerBook/touchpad/
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[2]: http://web.telia.com/~u89404340/touchpad/index.html
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@ -286,3 +286,23 @@ config USB_KEYSPAN_REMOTE
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To compile this driver as a module, choose M here: the module will
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be called keyspan_remote.
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config USB_APPLETOUCH
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tristate "Apple USB Touchpad support"
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depends on USB && INPUT
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---help---
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Say Y here if you want to use an Apple USB Touchpad.
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These are the touchpads that can be found on post-February 2005
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Apple Powerbooks (prior models have a Synaptics touchpad connected
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to the ADB bus).
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This driver provides a basic mouse driver but can be interfaced
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with the synaptics X11 driver to provide acceleration and
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scrolling in X11.
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For further information, see
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<file:Documentation/input/appletouch.txt>.
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To compile this driver as a module, choose M here: the
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module will be called appletouch.
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@ -41,3 +41,4 @@ obj-$(CONFIG_USB_WACOM) += wacom.o
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obj-$(CONFIG_USB_ACECAD) += acecad.o
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obj-$(CONFIG_USB_YEALINK) += yealink.o
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obj-$(CONFIG_USB_XPAD) += xpad.o
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obj-$(CONFIG_USB_APPLETOUCH) += appletouch.o
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469
drivers/usb/input/appletouch.c
Normal file
469
drivers/usb/input/appletouch.c
Normal file
@ -0,0 +1,469 @@
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/*
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* Apple USB Touchpad (for post-February 2005 PowerBooks) driver
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*
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* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2005 Johannes Berg (johannes@sipsolutions.net)
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* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
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* Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de)
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* Copyright (C) 2005 Peter Osterlund (petero2@telia.com)
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*
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* Thanks to Alex Harper <basilisk@foobox.net> for his inputs.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/input.h>
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#include <linux/usb_input.h>
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/* Apple has powerbooks which have the keyboard with different Product IDs */
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#define APPLE_VENDOR_ID 0x05AC
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#define ATP_DEVICE(prod) \
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.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
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USB_DEVICE_ID_MATCH_INT_CLASS | \
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USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
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.idVendor = APPLE_VENDOR_ID, \
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.idProduct = (prod), \
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.bInterfaceClass = 0x03, \
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.bInterfaceProtocol = 0x02
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/* table of devices that work with this driver */
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static struct usb_device_id atp_table [] = {
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{ ATP_DEVICE(0x020E) },
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{ ATP_DEVICE(0x020F) },
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{ ATP_DEVICE(0x030A) },
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{ ATP_DEVICE(0x030B) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE (usb, atp_table);
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/* size of a USB urb transfer */
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#define ATP_DATASIZE 81
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/*
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* number of sensors. Note that only 16 instead of 26 X (horizontal)
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* sensors exist on 12" and 15" PowerBooks. All models have 16 Y
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* (vertical) sensors.
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*/
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#define ATP_XSENSORS 26
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#define ATP_YSENSORS 16
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/* amount of fuzz this touchpad generates */
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#define ATP_FUZZ 16
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/* maximum pressure this driver will report */
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#define ATP_PRESSURE 300
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/*
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* multiplication factor for the X and Y coordinates.
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* We try to keep the touchpad aspect ratio while still doing only simple
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* arithmetics.
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* The factors below give coordinates like:
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* 0 <= x < 960 on 12" and 15" Powerbooks
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* 0 <= x < 1600 on 17" Powerbooks
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* 0 <= y < 646
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*/
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#define ATP_XFACT 64
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#define ATP_YFACT 43
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/*
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* Threshold for the touchpad sensors. Any change less than ATP_THRESHOLD is
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* ignored.
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*/
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#define ATP_THRESHOLD 5
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/* Structure to hold all of our device specific stuff */
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struct atp {
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struct usb_device * udev; /* usb device */
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struct urb * urb; /* usb request block */
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signed char * data; /* transferred data */
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int open; /* non-zero if opened */
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struct input_dev input; /* input dev */
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int valid; /* are the sensors valid ? */
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int x_old; /* last reported x/y, */
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int y_old; /* used for smoothing */
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/* current value of the sensors */
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signed char xy_cur[ATP_XSENSORS + ATP_YSENSORS];
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/* last value of the sensors */
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signed char xy_old[ATP_XSENSORS + ATP_YSENSORS];
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/* accumulated sensors */
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int xy_acc[ATP_XSENSORS + ATP_YSENSORS];
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};
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#define dbg_dump(msg, tab) \
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if (debug > 1) { \
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int i; \
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printk("appletouch: %s %lld", msg, (long long)jiffies); \
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for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) \
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printk(" %02x", tab[i]); \
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printk("\n"); \
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}
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#define dprintk(format, a...) \
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do { \
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if (debug) printk(format, ##a); \
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} while (0)
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MODULE_AUTHOR("Johannes Berg, Stelian Pop, Frank Arnold");
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MODULE_DESCRIPTION("Apple PowerBooks USB touchpad driver");
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MODULE_LICENSE("GPL");
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static int debug = 1;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Activate debugging output");
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static int atp_calculate_abs(int *xy_sensors, int nb_sensors, int fact,
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int *z, int *fingers)
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{
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int i;
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/* values to calculate mean */
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int pcum = 0, psum = 0;
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*fingers = 0;
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for (i = 0; i < nb_sensors; i++) {
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if (xy_sensors[i] < ATP_THRESHOLD)
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continue;
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if ((i - 1 < 0) || (xy_sensors[i - 1] < ATP_THRESHOLD))
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(*fingers)++;
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pcum += xy_sensors[i] * i;
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psum += xy_sensors[i];
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}
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if (psum > 0) {
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*z = psum;
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return pcum * fact / psum;
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}
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return 0;
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}
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static inline void atp_report_fingers(struct input_dev *input, int fingers)
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{
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input_report_key(input, BTN_TOOL_FINGER, fingers == 1);
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input_report_key(input, BTN_TOOL_DOUBLETAP, fingers == 2);
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input_report_key(input, BTN_TOOL_TRIPLETAP, fingers > 2);
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}
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static void atp_complete(struct urb* urb, struct pt_regs* regs)
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{
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int x, y, x_z, y_z, x_f, y_f;
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int retval, i;
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struct atp *dev = urb->context;
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switch (urb->status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* This urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__FUNCTION__, urb->status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__FUNCTION__, urb->status);
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goto exit;
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}
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/* drop incomplete datasets */
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if (dev->urb->actual_length != ATP_DATASIZE) {
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dprintk("appletouch: incomplete data package.\n");
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goto exit;
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}
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/* reorder the sensors values */
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for (i = 0; i < 8; i++) {
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/* X values */
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dev->xy_cur[i ] = dev->data[5 * i + 2];
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dev->xy_cur[i + 8] = dev->data[5 * i + 4];
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dev->xy_cur[i + 16] = dev->data[5 * i + 42];
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if (i < 2)
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dev->xy_cur[i + 24] = dev->data[5 * i + 44];
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/* Y values */
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dev->xy_cur[i + 26] = dev->data[5 * i + 1];
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dev->xy_cur[i + 34] = dev->data[5 * i + 3];
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}
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dbg_dump("sample", dev->xy_cur);
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if (!dev->valid) {
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/* first sample */
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dev->valid = 1;
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dev->x_old = dev->y_old = -1;
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memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
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/* 17" Powerbooks have 10 extra X sensors */
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for (i = 16; i < ATP_XSENSORS; i++)
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if (dev->xy_cur[i]) {
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printk("appletouch: 17\" model detected.\n");
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input_set_abs_params(&dev->input, ABS_X, 0,
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(ATP_XSENSORS - 1) *
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ATP_XFACT - 1,
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ATP_FUZZ, 0);
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break;
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}
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goto exit;
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}
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for (i = 0; i < ATP_XSENSORS + ATP_YSENSORS; i++) {
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/* accumulate the change */
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signed char change = dev->xy_old[i] - dev->xy_cur[i];
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dev->xy_acc[i] -= change;
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/* prevent down drifting */
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if (dev->xy_acc[i] < 0)
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dev->xy_acc[i] = 0;
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}
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memcpy(dev->xy_old, dev->xy_cur, sizeof(dev->xy_old));
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dbg_dump("accumulator", dev->xy_acc);
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x = atp_calculate_abs(dev->xy_acc, ATP_XSENSORS,
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ATP_XFACT, &x_z, &x_f);
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y = atp_calculate_abs(dev->xy_acc + ATP_XSENSORS, ATP_YSENSORS,
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ATP_YFACT, &y_z, &y_f);
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if (x && y) {
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if (dev->x_old != -1) {
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x = (dev->x_old * 3 + x) >> 2;
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y = (dev->y_old * 3 + y) >> 2;
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dev->x_old = x;
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dev->y_old = y;
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if (debug > 1)
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printk("appletouch: X: %3d Y: %3d "
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"Xz: %3d Yz: %3d\n",
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x, y, x_z, y_z);
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input_report_key(&dev->input, BTN_TOUCH, 1);
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input_report_abs(&dev->input, ABS_X, x);
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input_report_abs(&dev->input, ABS_Y, y);
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input_report_abs(&dev->input, ABS_PRESSURE,
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min(ATP_PRESSURE, x_z + y_z));
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atp_report_fingers(&dev->input, max(x_f, y_f));
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}
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dev->x_old = x;
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dev->y_old = y;
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}
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else if (!x && !y) {
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dev->x_old = dev->y_old = -1;
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input_report_key(&dev->input, BTN_TOUCH, 0);
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input_report_abs(&dev->input, ABS_PRESSURE, 0);
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atp_report_fingers(&dev->input, 0);
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/* reset the accumulator on release */
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memset(dev->xy_acc, 0, sizeof(dev->xy_acc));
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}
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input_report_key(&dev->input, BTN_LEFT, !!dev->data[80]);
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input_sync(&dev->input);
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exit:
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retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
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if (retval) {
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err("%s - usb_submit_urb failed with result %d",
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__FUNCTION__, retval);
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}
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}
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static int atp_open(struct input_dev *input)
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{
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struct atp *dev = input->private;
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if (usb_submit_urb(dev->urb, GFP_ATOMIC))
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return -EIO;
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dev->open = 1;
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return 0;
|
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}
|
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|
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static void atp_close(struct input_dev *input)
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{
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struct atp *dev = input->private;
|
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|
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usb_kill_urb(dev->urb);
|
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dev->open = 0;
|
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}
|
||||
|
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static int atp_probe(struct usb_interface *iface, const struct usb_device_id *id)
|
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{
|
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struct atp *dev = NULL;
|
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struct usb_host_interface *iface_desc;
|
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struct usb_endpoint_descriptor *endpoint;
|
||||
int int_in_endpointAddr = 0;
|
||||
int i, retval = -ENOMEM;
|
||||
|
||||
/* allocate memory for our device state and initialize it */
|
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dev = kmalloc(sizeof(struct atp), GFP_KERNEL);
|
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if (dev == NULL) {
|
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err("Out of memory");
|
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goto err_kmalloc;
|
||||
}
|
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memset(dev, 0, sizeof(struct atp));
|
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|
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dev->udev = interface_to_usbdev(iface);
|
||||
|
||||
/* set up the endpoint information */
|
||||
/* use only the first interrupt-in endpoint */
|
||||
iface_desc = iface->cur_altsetting;
|
||||
for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
|
||||
endpoint = &iface_desc->endpoint[i].desc;
|
||||
if (!int_in_endpointAddr &&
|
||||
(endpoint->bEndpointAddress & USB_DIR_IN) &&
|
||||
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
|
||||
== USB_ENDPOINT_XFER_INT)) {
|
||||
/* we found an interrupt in endpoint */
|
||||
int_in_endpointAddr = endpoint->bEndpointAddress;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!int_in_endpointAddr) {
|
||||
retval = -EIO;
|
||||
err("Could not find int-in endpoint");
|
||||
goto err_endpoint;
|
||||
}
|
||||
|
||||
/* save our data pointer in this interface device */
|
||||
usb_set_intfdata(iface, dev);
|
||||
|
||||
dev->urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!dev->urb) {
|
||||
retval = -ENOMEM;
|
||||
goto err_usballoc;
|
||||
}
|
||||
dev->data = usb_buffer_alloc(dev->udev, ATP_DATASIZE, GFP_KERNEL,
|
||||
&dev->urb->transfer_dma);
|
||||
if (!dev->data) {
|
||||
retval = -ENOMEM;
|
||||
goto err_usbbufalloc;
|
||||
}
|
||||
usb_fill_int_urb(dev->urb, dev->udev,
|
||||
usb_rcvintpipe(dev->udev, int_in_endpointAddr),
|
||||
dev->data, ATP_DATASIZE, atp_complete, dev, 1);
|
||||
|
||||
init_input_dev(&dev->input);
|
||||
dev->input.name = "appletouch";
|
||||
dev->input.dev = &iface->dev;
|
||||
dev->input.private = dev;
|
||||
dev->input.open = atp_open;
|
||||
dev->input.close = atp_close;
|
||||
|
||||
usb_to_input_id(dev->udev, &dev->input.id);
|
||||
|
||||
set_bit(EV_ABS, dev->input.evbit);
|
||||
|
||||
/*
|
||||
* 12" and 15" Powerbooks only have 16 x sensors,
|
||||
* 17" models are detected later.
|
||||
*/
|
||||
input_set_abs_params(&dev->input, ABS_X, 0,
|
||||
(16 - 1) * ATP_XFACT - 1, ATP_FUZZ, 0);
|
||||
input_set_abs_params(&dev->input, ABS_Y, 0,
|
||||
(ATP_YSENSORS - 1) * ATP_YFACT - 1, ATP_FUZZ, 0);
|
||||
input_set_abs_params(&dev->input, ABS_PRESSURE, 0, ATP_PRESSURE, 0, 0);
|
||||
|
||||
set_bit(EV_KEY, dev->input.evbit);
|
||||
set_bit(BTN_TOUCH, dev->input.keybit);
|
||||
set_bit(BTN_TOOL_FINGER, dev->input.keybit);
|
||||
set_bit(BTN_TOOL_DOUBLETAP, dev->input.keybit);
|
||||
set_bit(BTN_TOOL_TRIPLETAP, dev->input.keybit);
|
||||
set_bit(BTN_LEFT, dev->input.keybit);
|
||||
|
||||
input_register_device(&dev->input);
|
||||
|
||||
printk(KERN_INFO "input: appletouch connected\n");
|
||||
|
||||
return 0;
|
||||
|
||||
err_usbbufalloc:
|
||||
usb_free_urb(dev->urb);
|
||||
err_usballoc:
|
||||
usb_set_intfdata(iface, NULL);
|
||||
err_endpoint:
|
||||
kfree(dev);
|
||||
err_kmalloc:
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void atp_disconnect(struct usb_interface *iface)
|
||||
{
|
||||
struct atp *dev = usb_get_intfdata(iface);
|
||||
|
||||
usb_set_intfdata(iface, NULL);
|
||||
if (dev) {
|
||||
usb_kill_urb(dev->urb);
|
||||
input_unregister_device(&dev->input);
|
||||
usb_free_urb(dev->urb);
|
||||
usb_buffer_free(dev->udev, ATP_DATASIZE,
|
||||
dev->data, dev->urb->transfer_dma);
|
||||
kfree(dev);
|
||||
}
|
||||
printk(KERN_INFO "input: appletouch disconnected\n");
|
||||
}
|
||||
|
||||
static int atp_suspend(struct usb_interface *iface, pm_message_t message)
|
||||
{
|
||||
struct atp *dev = usb_get_intfdata(iface);
|
||||
usb_kill_urb(dev->urb);
|
||||
dev->valid = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int atp_resume(struct usb_interface *iface)
|
||||
{
|
||||
struct atp *dev = usb_get_intfdata(iface);
|
||||
if (dev->open && usb_submit_urb(dev->urb, GFP_ATOMIC))
|
||||
return -EIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct usb_driver atp_driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "appletouch",
|
||||
.probe = atp_probe,
|
||||
.disconnect = atp_disconnect,
|
||||
.suspend = atp_suspend,
|
||||
.resume = atp_resume,
|
||||
.id_table = atp_table,
|
||||
};
|
||||
|
||||
static int __init atp_init(void)
|
||||
{
|
||||
return usb_register(&atp_driver);
|
||||
}
|
||||
|
||||
static void __exit atp_exit(void)
|
||||
{
|
||||
usb_deregister(&atp_driver);
|
||||
}
|
||||
|
||||
module_init(atp_init);
|
||||
module_exit(atp_exit);
|
||||
Loading…
Reference in New Issue
Block a user