|From:||Christopher Heiny <firstname.lastname@example.org>|
|To:||Dmitry Torokhov <email@example.com>|
|Subject:||[RFC PATCH 00/11] input: Synaptics RMI4 Touchscreen Driver|
|Date:||Fri, 17 Aug 2012 15:17:40 -0700|
|Cc:||Jean Delvare <firstname.lastname@example.org>, Linux Kernel <email@example.com>, Linux Input <firstname.lastname@example.org>, Christopher Heiny <email@example.com>, Allie Xiong <firstname.lastname@example.org>, William Manson <email@example.com>, Peichen Chang <firstname.lastname@example.org>, Joerie de Gram <email@example.com>, Wolfram Sang <firstname.lastname@example.org>, Mathieu Poirier <email@example.com>, Linus Walleij <firstname.lastname@example.org>, Naveen Kumar Gaddipati <email@example.com>|
This patch implements a driver supporting Synaptics ClearPad and other touchscreen sensors that use the RMI4 protocol, as defined here: http://www.synaptics.com/sites/default/files/511-000136-0... as well as successor documents that haven't made their way through to publication yet. This code supersedes the patch submitted on 2011-12-21. We believe that all outstanding issues arising from the previous submissions have been addressed, except certain issues relating to the use of device_type and the binding of the individual function drivers (see below). This patch is against the v2.6.38 tag of Linus' kernel tree, commit 521cb40b0c44418a4fd36dc633f575813d59a43d. This will be our last patch against such an old kernel version, future patches will be against 3.x kernels. Included in this patch are: - full support for an RMI virtual bus as a standard kernel bus - physical layer implementations for I2C and SPI - function implementations for the following RMI4 functions: * F01 device control * F09 self test (aka BIST) * F11 multifinger pointing * F17 pointing sticks * F19 capacitive buttons * F1A simple capacitive buttons * F21 force sensing * F30 GPIO and LED controls * F34 device reflash * F41 active pen pointing * F54 analog data reporting - character device access to the RMI4 register map via rmidev - firmware reflash using the request_firmware mechanism The driver supports a system having one or more RMI sensors attached to it. Most devices have just a single touch sensor, but some have more than one. An example is the Fuse concept phone, which has 4 RMI sensors in it. Each sensor is presented as a device on the RMI logical bus (/sys/bus/rmi). Devices are named/numbered in the order they are discovered on the bus, starting with /sys/bus/rmi/devices/sensor00 for the first once, .../sensor01 for the second one, and so on. Individual RMI functions are presented as child devices of the sensor device. For example, sensor00/fn01, sensor00/fn11, and so on. Control of an RMI function's operating parameters is implemented via sysfs. For diagnostic purposes, the rmidev interface is provided. This implements a character device (/dev/rmi0, and so on) that provides flat file access to the RMI4 register map. For more information, see the file Documentation/input/rmidev.txt. Note regarding device_type and functional driver matching. Feedback on our patch submission from 2011-12 requested that we use device_type to help match drivers that worked directly with the sensor (such as rmi_dev.c) and drivers that work with individual functions (such as rmi_f11.c). We spent some effort on this request, but in the meantime the original customer requirements that led to the differentiation between the two types of driver no longer exist. As a result, we have rolled back that work, and plan to merge the rmi_dev functionality into the core of the driver, eliminating the need to support two device_types and their drivers. This will be included in our next patch submission, along with changes to how function drivers are matched functions. We considered postponing this patch until that was done, but it's been a very long time since the last one, and we wanted to make the other work available. Due to the large amount of code, we've broken this patch into 17 parts, as follows: 01 - public header files and documentation 02 - core sensor and bus implementation 03 - physical layer drivers 04 - Kconfigs and Makefiles 05 - rmidev 06 - firmware update 07..17 - drivers for individual RMI functions Comments and other feedback on this driver are welcomed. Christopher Heiny and the Synaptics RMI4 driver team Signed-off-by: Christopher Heiny <firstname.lastname@example.org> Cc: Jean Delvare <email@example.com> Cc: Linus Walleij <firstname.lastname@example.org> Cc: Naveen Kumar Gaddipati <email@example.com> Cc: Joeri de Gram <firstname.lastname@example.org> --- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to email@example.com More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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