On some devices the wake and enable pins of the pixcir touchscreen
controller are connected to gpios and these must be controlled by the
driver for the device to operate properly.
Signed-off-by: NSander Vermin <sander@vermin.nl>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

With commit 3fffd128 ("i2c: allow specifying separate wakeup
interrupt in device tree") wakeirq is managed by i2c-core, so remove
wakeirq related code from pixcir_i2c_ts driver.
Signed-off-by: NVignesh R <vigneshr@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

i2c_driver does not need to set an owner because i2c_register_driver()
will set it.
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Let's switch to using standard touchscreen device properties parsing module
instead of doing it by hand in the driver.
Acked-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

input_mt_init_slots() will perform necessary settings for performing
multi-touch to single-touch emulation, we do not need to do that ourselves.
Acked-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The controller has a RESET pin which is usually controlled over
a GPIO line. If such a GPIO is provided, perform a RESET
during probe.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

We are using threaded interrupt handler and thus are allowed to sleep.
Let's switch over to gpiod_get_value_cansleep() so that we do not get
ugly warnings in case GPIO controller might sleep when accessing GPIO.
Acked-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

This allows uniform parsing on legacy, DT and ACPI systems.
Acked-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Let's move driver's platform data definitions from include/linux/input/
into include/linux/platform_data/ so that it stays with the rest of
platform data definitions.
Acked-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The i2c_master_recv() uses readsize to receive data from i2c but compares
to size of rdbuf which is always 27. This would cause problem when the
max_fingers is not 5. Change the comparison value to readsize instead.

Fixes: 36874c7e ("Input: pixcir_i2c_ts - support up to 5 fingers and
hardware tracking IDs:)

Cc: stable@vger.kernel.org
Signed-off-by: NFrodo Lai <frodo_lai@bcmcom.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Some devices are not fast enough to differentiate between a fast-moving
contact and a new contact. This problem cannot be fully resolved because
information is truly missing, but it is possible to safe-guard against
obvious mistakes by restricting movement with a maximum displacement.

The new problem formulation for dmax > 0 cannot benefit from the speedup
for positive definite matrices, but since the convergence is faster, the
result is about the same. For a handful of contacts, the latency difference
is truly negligible.
Suggested-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Tested-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NHenrik Rydberg <rydberg@bitmath.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Use __maybe_unused instead of ifdef guards around suspend/resume
functions, in order to increase build coverage and fix build warnings.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Provide device tree support and binding information.  Also provide support
for a new chip "pixcir_tangoc".
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Some variants of the Pixcir touch controller support up to 5 simultaneous
fingers and hardware tracking IDs. Prepare the driver for that.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Switch to using the Type-B Multi-Touch protocol.
Reviewed-by: NHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Improve the suspend and resume handlers to allow the device
to wakeup the system from suspend.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Acked-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Get rid of the attb_read_val() platform hook. Instead, read the ATTB gpio
directly from the driver.

Fail if valid ATTB gpio is not provided by patform data.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Acked-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Introduce helper functions to configure power and interrupt registers.
Default to IDLE mode on probe as device supports auto wakeup to ACVIE mode
on detecting finger touch.

Configure interrupt mode and polarity on start up.  Power down on device
closure or module removal.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Acked-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Use devm_() and friends for allocating memory, input device
and IRQ.
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Acked-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Use the wrapper function for retrieving the platform data instead
of accessing dev->platform_data directly. This is a cosmetic change
to make the code simpler and enhance the readability.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NFugang Duan <B38611@freescale.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

CONFIG_HOTPLUG is going away as an option so __devexit is no
longer needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: NJavier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer
needed.
Signed-off-by: NBill Pemberton <wfp5p@virginia.edu>
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Since commit 1c6c6952 ("genirq: Reject bogus threaded irq requests")
threaded IRQs without a primary handler need to be requested with
IRQF_ONESHOT, otherwise the request will fail. This patch adds the
IRQF_ONESHOT to input drivers where it is missing. Not modified by
this patch are those drivers where the requested IRQ will always be a
nested IRQ (e.g. because it's part of an MFD), since for this special
case IRQF_ONESHOT is not required to be specified when requesting the
IRQ.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

This patch adds a driver for PIXCIR's I2C connected touchscreens.
Signed-off-by: NJianchun <jcbian@pixcir.com.cn>
Acked-by: NHenrik Rydberg <rydberg@euromail.se>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>