The chip hardware revision, firmware version and regdata
revision is needed to discern because for example touchkeys
are handled by different registers on different versions of
the chip. Example output from BT404:

Zinitix-TS 3-0020: chip revision 4040 firmware version 0088
  regdata version 0004
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240830-zinitix-tk-versions-v2-1-90eae6817eda@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Switch to using devm_clk_get_optional_enabled() helper instead of
acquiring the clock with devm_clk_get_optional(), enabling it, and
defining and installing a custom devm action to call clk_disable().
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/ZtDDGMaOFlMYjOrt@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Node names should be generic.

Improve the binding example by using 'touchscreen' as the node name.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240830194331.3774408-1-festevam@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add i8042.h and libps2.h to "INPUT (KEYBOARD, MOUSE, JOYSTICK,
TOUCHSCREEN) DRIVERS" section so that get_maintainers.pl script
will pick them up and patches affecting them will be sent to the
right place.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add gameport.h, serio.h and uinput.h and complementing them headers
from include/uapi/ to "INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)
DRIVERS" section so that get_maintainers.pl script will pick them up
and patches affecting them will be sent to the right place.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This makes the code more compact and error handling more robust
by ensuring that mutexes are released in all code paths when control
leaves critical section.
Acked-by: Henrik Rydberg <rydberg@bitmath.org>
Link: https://lore.kernel.org/r/ZsrBVO2w9WwX73iU@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Use __free(kfree) cleanup facility in matrix_keypad_parse_keymap() to
automatically free temporarily allocated memory.
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/ZspoEPdTcH-hpciy@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Adding software support for enabling the pure gpio capability of the
device - which allows all I/O to be used as GPIO. Previously, I/O
configuration was limited by software to partial GPIO support only.

When working in a pure gpio mode, the device does not require the
certain properties and hence, the following are now made optional:
	- interrupts
	- keypad,num-rows
	- keypad,num-columns
	- linux,keymap

However, note that the above are required to be specified when
configuring the device as a keypad, for which dependencies have been added
such that specifying either one requires the remaining as well.

Also, note that interrupts are made optional, but required when the device
has either been configured in keypad mode or as an interrupt controller.
This has been done since they may not necessarily be used when leveraging
the device purely for GPIO.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Utsav Agarwal <utsav.agarwal@analog.com>
Link: https://lore.kernel.org/r/20240826-adp5588_gpio_support-v11-3-3e5ac2bd31b7@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Keypad specific setup is relaxed if no keypad rows/columns are specified,
enabling a purely gpio operation.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Utsav Agarwal <utsav.agarwal@analog.com>
Link: https://lore.kernel.org/r/20240826-adp5588_gpio_support-v11-2-3e5ac2bd31b7@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This makes the code more compact and error handling more robust.
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Link: https://lore.kernel.org/r/20240826-adp5588_gpio_support-v11-1-3e5ac2bd31b7@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Switch to using devm_clk_get_enable() helper instead of acquiring the
clock with devm_clk_get(), enabling it, and defining and installing
a custom devm action to call clk_disable().
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/Zs4UWGKt3hLjNmoP@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add MODULE_DEVICE_TABLE(), so modules could be properly autoloaded
based on the alias from of_device_id table.
Signed-off-by: Liao Chen <liaochen4@huawei.com>
Link: https://lore.kernel.org/r/20240827123411.431388-1-liaochen4@huawei.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Convert binding doc ads7846.txt to yaml format.
Additional change:
- add ref to touchscreen.yaml and spi-peripheral-props.yaml.
- use common node name touchscreen.
- sort ti properties alphabetically.
- sort common properties alphabetically.
- sort compatible string alphabetically.
- remove vcc-supply from required list.
- deprecated ti,x-min, ti,y-min

Fix below warning: arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dtb: touchscreen@0:
	ti,x-min: b'\x00}' is not of type 'object', 'array', 'boolean', 'null'
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240826162302.960732-1-Frank.Li@nxp.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Let the kmemdup_array() take care about multiplication
and possible overflows.

Using kmemdup_array() is more appropriate and makes the code
easier to audit.
Signed-off-by: Shen Lichuan <shenlichuan@vivo.com>
Link: https://lore.kernel.org/r/20240826045253.3503-1-shenlichuan@vivo.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Limit amount of data that can be written into an evdev instance at
a given time to 4096 bytes (170 input events) to avoid holding
evdev->mutex for too long and starving other users.
Reviewed-by: Jeff LaBundy <jeff@labundy.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Link: https://lore.kernel.org/r/Zr5L8TUzkJcB9HcF@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The users of this driver were removed in 2013 in commit 28633c54
("ARM: ux500: Rip out keypad initialisation which is no longer used").

Remove the driver as well.
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/Zr-gX0dfN4te_8VG@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

When possible use dev_err_probe help to properly deal with the
PROBE_DEFER error, the benefit is that DEFER issue will be logged
in the devices_deferred debugfs file.
Using dev_err_probe() can reduce code size, and the error value
gets printed.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Link: https://lore.kernel.org/r/20210916153148.14045-1-caihuoqing@baidu.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Convert binding doc colibri-vf50-ts.txt to yaml.
Additional change:
- add ref touchscreen.yaml.
- remove standard pinctrl properties.

Fix below warning:
arch/arm64/boot/dts/freescale/imx8qm-apalis-eval.dtb: /touchscreen:
  failed to match any schema with compatible: ['toradex,vf50-touchscreen']
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240819142434.311760-1-Frank.Li@nxp.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Convert binding doc ad7879.txt to yaml format.
Additional change:
- Add ref to /schemas/spi/spi-peripheral-props.yaml
- Add #gpio-cell
- Remove  spi-cpol and spi-cpha in example, the place hold 'spi' can't
correct detect spi-controler.yaml. So these two properties can't
be recongnized.

Fix warning:
arch/arm64/boot/dts/freescale/imx8dx-colibri-aster.dtb:
/bus@5a000000/i2c@5a800000/touchscreen@2c: failed to match any schema with compatible: ['adi,ad7879-1']
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240810143840.3615450-1-Frank.Li@nxp.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The cyttsp4 touchscreen driver was contributed in 2013 and since then
has seen no updates. The driver uses platform data (no device tree
support) and there are no users of it in the mainline kernel. There were
occasional fixes to it for issues either found by static code analysis
tools or via visual inspection, but otherwise the driver is completely
untested.

Remove the driver.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/ZrAZ2cUow_z838tp@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The driver does not try to power down the rails at system suspend or
when touchscreen is not in use, but rather enables regulators at probe
time. Power savings are achieved by requesting the controller to enter
low power mode.

Switch to devm_regulator_bulk_get_enable() instead of separately
requesting regulators, enabling them, and installing a custom
devm-action to disable them on unbind/remove, which simplifies the
code.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/ZrAgj9rG6oVqfdoK@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The driver does not use legacy GPIO API, stop including this header.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/ZrAaOu_vf-cVBhRn@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The driver does not use legacy GPIO API, stop including this header.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/ZrAaHWNvaAfDlDfI@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Ensure that the touchscreen response has correct "report id" byte
before processing the touch data and discard other messages.

Fixes: 42370681 ("Input: Add support for ILITEK Lego Series")
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20240805085511.43955-3-francesco@dolcini.itSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

For different reasons i2c transaction may fail or report id in the
message may be wrong. Avoid closing the frame in this case as it will
result in all contacts being dropped, indicating that nothing is
touching the screen anymore, while usually it is not the case.

Fixes: 42370681 ("Input: Add support for ILITEK Lego Series")
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20240805085511.43955-2-francesco@dolcini.itSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Newer firmware allows to query touchpad resolution information by
reading from resolution register. Presence of resolution register is
signalled via bit 29 of the "register presence" register. On devices
that lack this resolution register we fall back to using pitch and
number of receivers data to calculate size of the sensor.
Signed-off-by: Marge Yang <marge.yang@tw.synaptics.com>
Signed-off-by: Vincent Huang <Vincent.Huang@tw.synaptics.com>
Link: https://lore.kernel.org/r/20240805083636.1381205-1-marge.yang@tw.synaptics.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This makes the code more compact and error handling more robust.

Link: https://lore.kernel.org/r/20240711172719.1248373-6-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Do not mark the device as wakeup-enabled by default, respect the
standard "wakeup-source" property.

Link: https://lore.kernel.org/r/20240711172719.1248373-5-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Instead of setting irq_set_irq_wake() directly in probe(), mark the device
as wakeup-capable, and use enable_irq_wake() and disable_irq_wake() in
suspend/resume path.

This also allows changing the wakeup setting dynamically at runtime using
/sys/devices/.../tsc2005/power/wakeup.
Reviewed-By: Sebastian Reichel <sre@kernel.org>
Link: https://lore.kernel.org/r/20240711172719.1248373-4-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

When the driver has been converted to use gpiod API it was requesting
and asserting the reset on probe, but never deasserted it. However
because of incorrect annotations in device tree marking reset line as
active high whereas in reality it is active low, the end result was
that the chip was never reset on probe. With polarity of the reset line
now corrected this became a problem.

Fix this by calling tsc200x_reset() from tsc200x_probe() to properly
complete the reset sequence and move requesting the reset GPIO and VIO
supply closer to the point where we need to start talking to the
hardware.

Fixes: d257f298 ("Input: tsc2005 - convert to gpiod")
Link: https://lore.kernel.org/r/20240711172719.1248373-3-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Instead of hard-coding interrupt trigger rely on ACPI/DT/board code
to set it up appropriately.

Link: https://lore.kernel.org/r/20240711172719.1248373-2-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The chip needs to be powered up before calling tsc200x_stop_scan() which
communicates with it; move the call to enable the regulator earlier in
tsc200x_probe().

At the same time switch to using devm_regulator_get_enable() to simplify
error handling. This also makes sure that regulator is not shut off too
early when unbinding the driver.

Link: https://lore.kernel.org/r/20240711172719.1248373-1-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Use of_property_present() to test for property presence rather than
of_get_property(). This is part of a larger effort to remove callers
of of_get_property() and similar functions. of_get_property() leaks
the DT property data pointer which is a problem for dynamically
allocated nodes which may be freed.
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240731191312.1710417-14-robh@kernel.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Use devm_clk_get_prepared() in order to remove a clk_unprepare() in an
error handling path of the probe and from the .remove() function.

This done, the whole .remove() function can also be axed because
'input_dev' is a managed resource allocated with
devm_input_allocate_device() and we can fully rely on devm for cleaning up.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/062986b0a5105cbc61330da0e55b22c00e2c1c4f.1722062145.git.christophe.jaillet@wanadoo.frSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This patch introduces a driver for the PixArt PS/2 touchpad, which
supports both clickpad and touchpad types.

At the same time, we extended the single data packet length to 16,
because according to the current PixArt hardware and FW design, we need
11 bytes/15 bytes to represent the complete three-finger/four-finger data.
Co-developed-by: Jon Xie <jon_xie@pixart.com>
Signed-off-by: Jon Xie <jon_xie@pixart.com>
Co-developed-by: Jay Lee <jay_lee@pixart.com>
Signed-off-by: Jay Lee <jay_lee@pixart.com>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Link: https://lore.kernel.org/r/20240704125243.3633569-1-zhoubinbin@loongson.cnSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Zinitix touch controllers can use some of the sense lines for virtual
keys (like those found on many phones). Add support for those keys.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Link: https://lore.kernel.org/r/20240717-zinitix-tkey-v5-2-52ea4cd4bd50@trvn.ruSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

In some configurations the touch controller can support the touch-keys.
Document the linux,keycodes property that enables those keys and
specifies the keycodes that should be used to report the key events.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Nikita Travkin <nikita@trvn.ru>
Link: https://lore.kernel.org/r/20240717-zinitix-tkey-v5-1-52ea4cd4bd50@trvn.ruSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Export a sysfs interface that would allow reading and writing touchscreen
IC registers. With this interface many things can be done in usersapce
such as firmware updates. An example tool that utilizes this interface
for performing firmware updates can be found at [1].

[1] https://github.com/goodix/fwupdate_for_berlin_linuxSigned-off-by: Charles Wang <charles.goodix@gmail.com>
Link: https://lore.kernel.org/r/20240514115135.21410-1-charles.goodix@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Report input event directly on wakeup to ensure no press event is missed
when resuming from suspend.
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240716000721.3485597-1-Frank.Li@nxp.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Remove reference to no longer working usbb2k-api-dev@nongnu.org
mailing list.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>