Dmitry requested to keep these around for the purposes of documentation.

Fixes the following W=1 kernel build warning(s):

 drivers/input/touchscreen/melfas_mip4.c: In function ‘mip4_report_touch’:
 drivers/input/touchscreen/melfas_mip4.c:474:5: warning: variable ‘size’ set but not used [-Wunused-but-set-variable]
 drivers/input/touchscreen/melfas_mip4.c:472:5: warning: variable ‘pressure_stage’ set but not used [-Wunused-but-set-variable]
 drivers/input/touchscreen/melfas_mip4.c:469:7: warning: variable ‘palm’ set but not used [-Wunused-but-set-variable]
 drivers/input/touchscreen/melfas_mip4.c:468:7: warning: variable ‘hover’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210114152323.2382283-3-lee.jones@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Fixes the following W=1 kernel build warning(s):

 drivers/input/mouse/synaptics.c: In function ‘synaptics_process_packet’:
 drivers/input/mouse/synaptics.c:1110:6: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210114152323.2382283-2-lee.jones@linaro.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

We are still missing handling for errata i689 related issues for the
case where we never see a key up interrupt for the last pressed key.

To fix the issue, we must scan the key state again after the keyboard
controller has idled to check if a key up event was missed. This is
described in the omap4 silicon errata documentation for Errata ID i689
"1.32 Keyboard Key Up Event Can Be Missed":

"When a key is released for a time shorter than the debounce time,
 in-between 2 key press (KP1 and KP2), the keyboard state machine will go
 to idle mode and will never detect the key release (after KP1, and also
 after KP2), and thus will never generate a new IRQ indicating the key
 release."

We can use PM runtime autosuspend features to check the keyboard state
after it enters idle.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/X/vrygoBxzGyXhfc@atomide.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Implement PM runtime autosuspend support to prepare for adding handling to
clear stuck last pressed key in the following patches. The hardware has
support for autoidle and can wake up to keypress events.

Let's also update omap4_keypad_probe() to use dev instead of &pdev->dev
since we already have it from the earlier changes.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/X/vqCs5/EDURprAJ@atomide.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Let's move rest of the key scanning code to omap4_keypad_scan_keys().
We will use omap4_keypad_scan_keys() also for implementing errata
handling to clear the stuck last key in the following patch.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210110190529.46135-4-tony@atomide.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Because of errata i689 the keyboard can idle with state where no key
up interrupts are seen until after the next key press.

This means we need to first check for any lost key up events before
scanning for new down events.

For example, rapidly pressing shift-shift-j can sometimes produce a J
instead of j. Let's fix the issue by scanning the keyboard in two
phases. First we scan for any key up events that we may have missed,
and then we scan for key down events.

Let's also simplify things with for_each_set_bit() as suggested by
Dmitry Torokhov <dmitry.torokhov@gmail.com>.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210110190529.46135-3-tony@atomide.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

We are not using the long events and they produce extra interrupts.
Let's not enable them at all.

Note that also the v3.0.8 Linux Android kernel has long interrupts
disabled.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210110190529.46135-2-tony@atomide.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Now that input core supports devres-managed input devices we can clean
up this driver a bit.

Link: https://lore.kernel.org/r/X/qfJKiM21uyksYl@google.comTested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

devm_platform_ioremap_resource() depends on CONFIG_HAS_IOMEM, so let's add
it to the dependencies when COMPILE_TEST is enabled.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: c8834032 ("Input: imx_keypad - add COMPILE_TEST support")
Link: https://lore.kernel.org/r/X9llpA3w1zlZCHXU@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The OF match table is only used when OF is enabled.

Fixes: cd3f6098 ("Input: new da7280 haptic driver")
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Roy Im <roy.im.opensource@diasemi.com>
Link: https://lore.kernel.org/r/X9xRLVPt9eBi0CT6@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add default write command package to prevent i2c quirk error of zero
data length as Raydium touch firmware update is executed.
Signed-off-by: jeffrey.lin <jeffrey.lin@rad-ic.com>
Link: https://lore.kernel.org/r/1608031217-7247-1-git-send-email-jeffrey.lin@raydium.corp-partner.google.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

An "if" testing for error condition has accidentally been dropped from
the code.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: cd3f6098 ("Input: new da7280 haptic driver")
Reviewed-by: Roy Im <Roy.Im.Opensource@diasemi.com>
Link: https://lore.kernel.org/r/X9j8lGFgijzHyYZZ@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

There is a spelling mistake in a dev_err message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201214223109.82924-1-colin.king@canonical.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

gcc -Warray-bounds warns about a serious bug in
cyapa_pip_retrieve_data_structure:

drivers/input/mouse/cyapa_gen6.c: In function 'cyapa_pip_retrieve_data_structure.constprop':
include/linux/unaligned/access_ok.h:40:17: warning: array subscript -1 is outside array bounds of 'struct retrieve_data_struct_cmd[1]' [-Warray-bounds]
   40 |  *((__le16 *)p) = cpu_to_le16(val);
drivers/input/mouse/cyapa_gen6.c:569:13: note: while referencing 'cmd'
  569 |  } __packed cmd;
      |             ^~~

Apparently the '-2' was added to the pointer instead of the value,
writing garbage into the stack next to this variable.

Fixes: c2c06c41 ("Input: cyapa - add gen6 device module support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201026161332.3708389-1-arnd@kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add new compatible strings and match data to support sc2730 and sc2721
which are two varieties of SC27XX family.
Signed-off-by: Nemo Han <nemo.han@unisoc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Link: https://lore.kernel.org/r/20201117034949.47877-2-zhang.lyra@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add new compatible strings to support sc2730 and sc2721 which are
two varieties of SC27XX family.
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201117034949.47877-4-zhang.lyra@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Convert the sprd sc27xx vibrator binding to DT schema using json-schema.
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201117034949.47877-3-zhang.lyra@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Make use of generic touchscreen_properties structure to add axis
inversion and swapping capabilities. It's configurable via devicetree
properties:
  touchscreen-inverted-x
  touchscreen-inverted-y
  touchscreen-swapped-x-y
Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Link: https://lore.kernel.org/r/20200922093903.157232-1-s.riedmueller@phytec.deSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

If device is set up as a wakeup source, I2C core configures the interrupt
line as wake IRQ and PM core automatically configures it for waking up the
system on system suspend transition, so we do not have to explicitly call
enable_irq_wake() and disable_irq_wake() in suspend/resume.

Link: https://lore.kernel.org/r/20201120073920.3214492-2-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

We should not be configuring the controller as a wakeup source in the
driver, but rather rely on I2C core to mark it as such by either
instantiating as I2C_CLIENT_WAKEUP or specifying "wakeup-source" device
property.

Link: https://lore.kernel.org/r/20201120073920.3214492-1-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Replace a comma between expression statements by a semicolon.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20201211085032.2598-1-zhengyongjun3@huawei.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Replace a comma between expression statements by a semicolon.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20201211084957.2540-1-zhengyongjun3@huawei.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Adds support for the Dialog DA7280 LRA/ERM Haptic Driver with
multiple mode and integrated waveform memory and wideband support.
It communicates via an I2C bus to the device.
Signed-off-by: Roy Im <roy.im.opensource@diasemi.com>
Reviewed-by: Jes Sorensen <Jes.Sorensen@gmail.com>.
Link: https://lore.kernel.org/r/1e293e8c4830b09255af3b7e1721b73afaefdfa3.1606320459.git.Roy.Im@diasemi.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add device tree binding information for DA7280 haptic driver.
Example bindings for DA7280 are added.
Signed-off-by: Roy Im <roy.im.opensource@diasemi.com>
Reviewed-by: Rob Herring <robh@kernel.org>.
Link: https://lore.kernel.org/r/2bc9a4a9d083ea8f360ec75f6281b6de6c4ef284.1606320459.git.Roy.Im@diasemi.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This patch adds the da7280 bindings doc and driver to the Dialog
Semiconductor support list.
Signed-off-by: Roy Im <roy.im.opensource@diasemi.com>
Link: https://lore.kernel.org/r/e2a01173699486519f8da85b9283c6af8481fbdb.1606320459.git.Roy.Im@diasemi.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

There are some version of Elan trackpads that send incorrect data when
in SMbus mode, unless they are switched to use 0x5f reports instead of
standard 0x5e. This patch implements querying device to retrieve chips
identifying data, and switching it, when needed to the alternative
report.
Signed-off-by: Jingle Wu <jingle.wu@emc.com.tw>
Link: https://lore.kernel.org/r/20201211071531.32413-1-jingle.wu@emc.com.twSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The 0x5F is a new trackpoint report type used by some modules.
Signed-off-by: Jingle Wu <jingle.wu@emc.com.tw>
Link: https://lore.kernel.org/r/20201211071511.32349-1-jingle.wu@emc.com.twSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add information found in downstream kernels, to make the code less
magic.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/728fff020bc92be10d84cc2a7ea8af6fd99af96c.1607669375.git.mirq-linux@rere.qmqm.plSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Simplify the return expression.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Link: https://lore.kernel.org/r/20201210135943.1612-1-zhengyongjun3@huawei.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add COMPILE_TEST support to imx_keypad driver for better compile
testing coverage.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/1583137573-16628-1-git-send-email-Anson.Huang@nxp.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

In a recent change to the SPI subsystem [1], a new `delay` struct was added
to replace the `delay_usecs`. This change replaces the current
`delay_usecs` with `delay` for this driver.

The `spi_transfer_delay_exec()` function [in the SPI framework] makes sure
that both `delay_usecs` & `delay` are used (in this order to preserve
backwards compatibility).

[1] commit bebcfd27 ("spi: introduce `delay` field for
`spi_transfer` + spi_transfer_delay_exec()")
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Tested-by: Ronald Tschalär <ronald@innovation.ch>
Reviewed-by: Ronald Tschalär <ronald@innovation.ch>
Link: https://lore.kernel.org/r/20200227124534.23399-1-sergiu.cuciurean@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

In a recent change to the SPI subsystem [1], a new `delay` struct was added
to replace the `delay_usecs`. This change replaces the current
`delay_usecs` with `delay` for this driver.

The `spi_transfer_delay_exec()` function [in the SPI framework] makes sure
that both `delay_usecs` & `delay` are used (in this order to preserve
backwards compatibility).

[1] commit bebcfd27 ("spi: introduce `delay` field for
`spi_transfer` + spi_transfer_delay_exec()")
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Link: https://lore.kernel.org/r/20200227130336.27042-1-sergiu.cuciurean@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

In a recent change to the SPI subsystem [1], a new `delay` struct was added
to replace the `delay_usecs`. This change replaces the current
`delay_usecs` with `delay` for this driver.

The `spi_transfer_delay_exec()` function [in the SPI framework] makes sure
that both `delay_usecs` & `delay` are used (in this order to preserve
backwards compatibility).

[1] commit bebcfd27 ("spi: introduce `delay` field for
`spi_transfer` + spi_transfer_delay_exec()")
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Link: https://lore.kernel.org/r/20200228104508.15564-1-sergiu.cuciurean@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Instead of special-casing retrieval of number of X/Y electrodes based on
the firmware, let's select default values and mark registers as
non-existent on firmwares that do not support this operation.

Also mark "report rate" register as non-existent for generic firmwares
as having it set to 0 does not make sense.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Simon Budig <simon.budig@kernelconcepts.de>
Link: https://lore.kernel.org/r/X9FZFs3NZADoIhhH@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The Samsung touchkey controllers are often used with external pull-up
for the interrupt line and the I2C lines, so we might need to enable
a regulator to bring the lines into usable state. Otherwise, this might
cause spurious interrupts and reading from I2C will fail.

Implement support for a "vddio-supply" that is enabled by the
tm2-touchkey driver so that the regulator gets enabled when needed.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20201203131242.44397-3-stephan@gerhold.netSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

The Samsung touchkey controllers are often used with external pull-up
for the interrupt line and the I2C lines, so we might need to enable
a regulator to bring the lines into usable state. Otherwise, this might
cause spurious interrupts and reading from I2C will fail.

Document support for a "vddio-supply" that is enabled by the tm2-touchkey
driver so that the regulator gets enabled when needed.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201203131242.44397-2-stephan@gerhold.netSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Convert the device tree bindings for tm2-touchkey to the YAML format.

While we're at it, clarify the descriptions a bit to make it clear that
this driver can be used for many different MCUs that all implement
a similar I2C protocol. Depending on the MCU the voltage requirements
may be different, on some devices the controller uses 2.2V, 2.8V or
even 3.3V for vcc-supply instead of 1.8V.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201203131242.44397-1-stephan@gerhold.netSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

devm_add_action_or_reset() is introduced as a helper function which
internally calls devm_add_action(). If devm_add_action() fails
then it will execute the action mentioned and return the error code.
This reduce source code size (avoid writing the action twice)
and reduce the likelyhood of bugs.
Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Link: https://lore.kernel.org/linux-input/20190708123323.11943-1-huangfq.daxian@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This adds support for the power button attached to the Embedded Controller
on a Dell Wyse 3020 "Ariel" board.

The Embedded Controller's SPI interface is actually capable sending and
receiving the PS/2 keyboard and mouse protocol data, which looks like
a good fit for a serio driver. Howerver, I don't know of any machines where
this is actually used.

My board only has a single power button and no way to connect an actual
keyboard or a mouse. Using the atkbd driver with serio would be an overkill
and would be inconvenient for the userspace. Therefore this driver
registers an input device that is only capable of reporting the power
button presses and releases.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20201201083533.1724287-3-lkundrak@v3.skSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add binding document for the Dell Wyse 3020 a.k.a. "Ariel" Power Button.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201201083533.1724287-2-lkundrak@v3.skSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>