One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
    int stuff;
    struct boo entry[];
};

size = sizeof(struct foo) + count * sizeof(struct boo);
instance = kzalloc(size, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

Notice that, in this case, variable size is not necessary, hence
it is removed.

This code was detected with the help of Coccinelle.
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Reduce size of duplicated comments by switching to use SPDX identifier.

No functional change.

While here, correct MODULE_LICENSE() string to be aligned with license text.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

ACPI allows to enumerate specific devices by using compatible strings.
Enable that enumeration for EDT touchscreen devices.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/input/touchscreen/ti_am335x_tsc.c: In function 'titsc_suspend':
drivers/input/touchscreen/ti_am335x_tsc.c:510:24: warning:
 variable 'tscadc_dev' set but not used [-Wunused-but-set-variable]

drivers/input/touchscreen/ti_am335x_tsc.c: In function 'titsc_resume':
drivers/input/touchscreen/ti_am335x_tsc.c:527:24: warning:
 variable 'tscadc_dev' set but not used [-Wunused-but-set-variable]

It's not used any more after 333e07ec ("Input: ti_am335x_tsc: Mark TSC
device as wakeup source")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Convert string compares of DT node names to use of_node_name_eq helper
instead. For the root node on SUN DT, we need to retrieve the 'name'
property as it is the rare case where the 'name' property and node name
differ. With both changes, it removes direct access to the node name
pointer.

While at it, convert the open coded loop to use for_each_child_of_node().
Signed-off-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

"Invalid config" gives little idea what's wrong. Print the values that
must not be 0 so we know which ones are off.
Signed-off-by: NGuido Günther <agx@sigxcpu.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Refer to touchscreen.txt for generic touch properties. This avoids
duplication and we're using the generic code to parse these in the
driver. While at that add touchscreen-size-{x,y} which are respected by
the driver as well.
Signed-off-by: NGuido Günther <agx@sigxcpu.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

From what I've seen in vendor trees it's fine to treat this as gt1x¹.
Tested on the Purism Librem 5 Devkit (Rocktech JH057N00900 panel).

[1]: https://github.com/TadiT7/android_kernel_mtk-4.4/tree/master/drivers/input/touchscreen/mediatek/GT5688Signed-off-by: NGuido Günther <agx@sigxcpu.org>
Reviewed-by: NBastien Nocera <hadess@hadess.net>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Remove a leftover spinlock.

This was required back when mod_delayed_work() did not exist, and had to
be implemented with a cancel + queue. See commit e7c2f967
("workqueue: use mod_delayed_work() instead of __cancel + queue")

schedule_delayed_work() and mod_delayed_work() can now be used
concurrently. So the spinlock is no longer needed.
Signed-off-by: NSven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/input/joystick/db9.c: In function ‘db9_saturn_read_packet’:
drivers/input/joystick/db9.c:256:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (tmp == 0xff) {
      ^
drivers/input/joystick/db9.c:263:2: note: here
  default:
  ^~~~~~~

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Remove a spinlock which prevents schedule_delayed_work() and
mod_delayed_work() from executing concurrently.

This was required back when mod_delayed_work() did not exist,
and had to be implemented with a cancel + schedule. See
commit e7c2f967 ("workqueue: use mod_delayed_work() instead of
__cancel + queue")

schedule_delayed_work() and mod_delayed_work() can now be used
concurrently. So the spinlock is no longer needed.
Signed-off-by: NSven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

This is required to specify generic touchscreen properties via DT.
Signed-off-by: NMatthias Fend <matthias.fend@wolfvision.net>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Now that LEDs core allows "blocking" flavor of "set brightness" method we
can use it and get rid of private work item.
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Use devm_gpiod_get_optional() and gpiod_set_value_cansleep() instead
of the old API. The st1232_ts_power() now passes on the inverted "poweron"
value to reflect the correct logical value.
Signed-off-by: NMartin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Fetching the geometry from the ILI251x registers seems unreliable and
sometimes returns all zeroes. Add support for fetching the geometry and
axis inversion from DT instead.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The PTR_ERR(NULL) value is zero and it's not useful to print that.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

We need to access I2C bus when switching brightness, and that may block,
therefore we have to set stmfts_brightness_set() as LED's
brightness_set_blocking() method.

Fixes: 72d1f234 ("Input: tm2-touchkey - add touchkey driver support for TM2")
Acked-by: NAndi Shyti <andi@etezian.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

We need to turn regulators on and off when switching brightness, and
that may block, therefore we have to set stmfts_brightness_set() as
LED's brightness_set_blocking() method.

Fixes: 78bcac7b ("Input: add support for the STMicroelectronics FingerTip touchscreen")
Acked-by: NAndi Shyti <andi@etezian.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

By switching to devm_device_add_group() we can complete driver conversion
to using managed resources and get rid of ili210x_i2c_remove().
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Add support for ILI251x touch controller. This controller is similar
to the ILI210x, except for the following differences:
- Does not support I2C R-W transfer, Read must be followed by an
  obscenely long delay, and then followed by Write
- Does support 10 simultaneous touch inputs.
- Touch data format is slightly different, pressure reporting does not
  work although the touch data contain such information.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Add OF match table for the ili210x touchscreen.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Perform the register access only after the I2C client data are set,
this is only done in preparation for the subsequent patch which
uses the I2C client data in the register IO function.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Get rid of the packed structures for representing data as that does not
apply to other similar Ilitek touchscreens. Instead, implement a function
which parses the data and reports touch events and coordinates.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Convert the driver to devm_request_irq(), drop the related unmanaged
deregistration code and add ili210x_irq_teardown() to tear the IRQ
down and cancel possible touchscreen pending work.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The touchscreen can have a reset GPIO connected to it, add support
for such an arrangement.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Convert the driver to dev-managed allocations.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The .get_pendown_state callback is set only by the platform data code,
which was just removed. Thus, get_pendown_state() always returns false,
so drop that altogether.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

There is not a single user of the ili210x platform data in the kernel,
just drop it.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Add DT binding document for the Ilitek ILI210x and ILI251x
touchscreen controllers.
Signed-off-by: NMarek Vasut <marex@denx.de>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

This patch adds a new vibrator driver that supports various Qualcomm
MSM SOCs. Driver was tested on a LG Nexus 5 (hammerhead) phone.
Signed-off-by: NBrian Masney <masneyb@onstation.org>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

On some platforms (e.g.: ARCH_BRCMSTB) it is possible to enter
"poweroff" while leaving some wake-up sources enabled such as key
presses in order to allow for the system to wake-up.

Wire up a .shutdown() callback which calls into the existing
gpio_keys_suspend() since the logic is essentially the same.
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

We should rely on the interrupt trigger (level vs edge) set up by the
firmware or board code instead of forcing what we consider appropriate.
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Some of the #defined register values are one-bit flags. Convert them to
use the BIT(x) macro instead of 1 byte hexadecimal values. This improves
readability and clarifies the intent.
Signed-off-by: NRichard Leitner <richard.leitner@skidata.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

of_touchscreen.c provides a common interface for a axis inversion and
swapping of touchscreens. Therefore use it in the sx8654 driver.
Signed-off-by: NRichard Leitner <richard.leitner@skidata.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The sx8654 and sx8650 are quite similar, therefore add support for the
sx8650 within the sx8654 driver.
Signed-off-by: NRichard Leitner <richard.leitner@skidata.com>
Reviewed-by: NRob Herring <robh@kernel.org>
[dtor: use __be16 in sx8650_irq, add missing del_timer_sync]
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

As the sx865[456] share the same datasheet and differ only in the
presence of a "capacitive proximity detection circuit" and a "haptics
motor driver for LRA/ERM" add them to the compatbiles. As the driver
doesn't implement these features it should be no problem.
Signed-off-by: NRichard Leitner <richard.leitner@skidata.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

The sx8654 features a NRST input which may be connected to a GPIO.
Therefore add support for hard-resetting the sx8654 via this NRST.

If the reset-gpio property is provided the sx8654 is resetted via NRST
instead of the soft-reset via I2C.
Signed-off-by: NRichard Leitner <richard.leitner@skidata.com>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

This adds myself as an author of the st1232 driver module as Tony's
email address doesn't seem to work anymore.
Signed-off-by: NMartin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Add support for the Sitronix ST1633 touchscreen controller to the st1232
driver. A protocol spec can be found here:
www.ampdisplay.com/documents/pdf/AM-320480B6TZQW-TC0H.pdf
Signed-off-by: NMartin Kepplinger <martin.kepplinger@ginzinger.com>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>

Unfortunately the evervision focaltech implementation uses two offset
registers, one for the x coordinate and one for y.

This patch extends the driver to handle those offset registers only for
devices that support these.
Signed-off-by: NMarco Felsch <m.felsch@pengutronix.de>
Reviewed-by: NRob Herring <robh@kernel.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>