Adds support for the EMR digitizer on the Cintiq 24HD touch. The
EMR digitizer should work identically to that found on the Cintiq
24HD. The touch digitizer is a separate USB device similar to how
we split apart some other devices.
Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Fixes the following warning:
WARNING: struct dev_pm_ops should normally be const
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Use of_get_child_count() instead of custom implementation.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Instead of having to define the match table to NULL if CONFIG_OF isn't
set, use the of_match_ptr() macro which will do this for us.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Reformat the code to keep it within 80 columns.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Switch to using __u32/__s32 instead of ordinary 'int' in structures
forming userspace API.

Also internally make request_id unsigned int.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

If uinput_request_submit() fails after new request ID was allocated
we need to mark that request ID as free, otherwise it will always
stay occupied and we may run out of available IDs.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Consider two threads calling read() on the same uinput-fd, both
non-blocking. Assume there is data-available so both will simultaneously
pass:
	udev->head == udev->tail

Then the first thread goes to sleep and the second one pops the message
from the queue. Now assume udev->head == udev->tail. If the first thread
wakes up it will call wait_event_*() and sleep in the waitq. This
effectively turns the non-blocking FD into a blocking one.

We fix this by attempting to fetch events from the queue first and only
if we fail to retrieve any events we either return -EAGAIN (in case of
non-blocing read) or wait until there are more events.

This also fixes incorrect return code (we were returning 0 instead of
 -EAGAIN for non-blocking reads) when an event is "stolen" by another
thread. Blocking reads will now continue to wait instead of returning 0
in this scenario.

Count of 0 continues to be a special case, as per spec: we will check for
device existence and whether there are events in the queue, but no events
will be actually retrieved.
Reported-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Let's check whether the user-supplied buffer is actually big enough and
return -EINVAL if it is not. This differs from current behavior, which
caused 0 to be returned and actually does not make any sense, as
broken application will simply repeat the read getting into endless
loop.

Note that we treat 0 as a special case, according to the standard:

"Before any action described below is taken, and if nbyte is zero,
the read() function may detect and return errors as described below.
In the absence of errors, or if error detection is not performed,
the read() function shall return zero and have no other results."
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

When fetching events form device's buffer in uinput_read() we need to
take input device's event_lock to avoid racing with new event delivery.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

MATCH_BIT() is ugly and stupid, we have much nicer bitmap_subset() which
does the same and does not hide control flow.
Reported-by: Baodong Chen <chenbdchenbd@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This adds devicetree bindings to the rotary encoder driver and some
documentation about how to use them. Tested on a PXA3xx platform.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Drivers should not be changing platform data attached to the device
because they do not own it.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Use gpio_request_one() instead of separate calls to gpio_request() and
gpio_direction_input() to simplify the code.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Don't call gpio_to_irq() on GPIOs before gpio_request() succeeded on
them. This avoids Ooopses with incorrect DT bindings.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Fixes for some coding style issues reported by scripts/checkpatch.pl
utility.
Signed-off-by: Baodong Chen <chenbdchenbd@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

As the power button causes a wake from suspend, we need to register
the event with the pm sustem to avoid racing with suspend.

As the input event is reported in the interrupt handler, as simple
pm_wakeup_event() is sufficient.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

In order to avoid races with suspend, a wakeup event must register as
such by calling pm_wakeup_event() or pm_stay_awake().  This will ensure
that the current suspend cycle aborts.

When the user-space visible event is created in the interrupt handler
(gpio_keys_irq_isr), a simple pm_wakeup_event() with no delay is
sufficient as suspend will synchronise with all interrupt delivery.

When the user-space visible event is created later
(gpio_keys_gpio_isr), we need to bracket the event with
pm_stay_awake() and pm_relax().
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

- fix sizeof in memset;
- clean up dt properties extraction;
- use for_each_chil_of_node macro;
- use of_get_child_count();
- use of_match_ptr macro.
Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
[Fabio Estevam <fabio.estevam@freescale.com>: fix fix NULL pointer
dereference for dt case - pdata->buttons wasn't initialized]
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

The touchpad on the Acer Aspire One D250 will report out of range values
in the extreme lower portion of the touchpad. These appear as abrupt
changes in the values reported by the hardware from very low values to
very high values, which can cause unexpected vertical jumps in the
position of the mouse pointer.

What seems to be happening is that the value is wrapping to a two's
compliment negative value of higher resolution than the 13-bit value
reported by the hardware, with the high-order bits being truncated. This
patch adds handling for these values by converting them to the
appropriate negative values.

The only tricky part about this is deciding when to treat a number as
negative. It stands to reason that if out of range values can be
reported on the low end then it could also happen on the high end, so
not all out of range values should be treated as negative. The approach
taken here is to split the difference between the maximum legitimate
value for the axis and the maximum possible value that the hardware can
report, treating values greater than this number as negative and all
other values as positive. This can be tweaked later if hardware is found
that operates outside of these parameters.

BugLink: http://bugs.launchpad.net/bugs/1001251
Cc: stable@vger.kernel.org
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This is a driver for the EDT "Polytouch" family of touch controllers
based on the FocalTech FT5x06 line of chips.
Signed-off-by: Simon Budig <simon.budig@kernelconcepts.de>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This is a initial driver for new touchscreen chip mms114 of MELFAS.
It uses I2C interface and supports 10 multi touch.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This is a driver for the key scan interface of the LPC32xx SoC
Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Add device tree support for omap4 keypad driver and update the
Documentation with omap4 keypad device tree binding information.

Tested on omap4430 sdp.
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This change adds support for old Hanwang Art master II tablet
Signed-off-by: weixing <weixing@hanwang.com.cn>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

On some platform it may happen that the input clock to keyboard may
change during suspend, thus impacting its wakeup capability.

There is no means for keyboard driver to know this frequency before
hand. Hence introduce a platform data 'suspended_rate' which indicates
the frequency during suspend at which keyboard operates.

Accordingly reprogram keyboard while going into suspend and restore
original configuration at the time of resume.
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

SPEAr keyboard should normally disable clock during suspend and enable it
during resume.

For cases where it is expected to act as a wakeup source the clock can
remain in the same state i.e. kept enabled if it is being used.
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

envelope->attack_level is a u16 type.  We're trying to clamp it here
so it's between 0 and 0x7fff.  Unfortunately, the cast to __s16 turns
all the values larger than 0x7fff into negative numbers and min_t()
thinks they are less than 0x7fff.  envelope_level is an int so now
we've got negative values stored there.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Read the Firmware ID and Board Number from a synaptics device at init
and display them in the system log.

Device behavior is very board and firmware dependent.
It may prove useful for users to include this information when providing
bug reports or other feedback.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Current implementation hard coded keyboard frequency configuration
assuming input clock as fixed APB (83 MHz). Generalize the configuration
using clock framework APIs.
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Rename bit definition macros to reflect keyboard registers clearly thus
being more readable.
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

All SPEAr keyboard registers are 32 bit wide and are word aligned. This
patch aligns all io access to be word size using relaxed version of
readl/writel.
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

This patch is to disable device wakeup while removing keyboard.
Signed-off-by: Vipul Kumar Samar <vipulkumar.samar@st.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Apparently GCC can't figure out that we bail if we fail to query device
and will not try to use 'features':

drivers/input/touchscreen/wacom_i2c.c: In function ‘wacom_i2c_probe’:
drivers/input/touchscreen/wacom_i2c.c:177:20: warning: ‘features.fw_version’
	may be used uninitialized in this function [-Wmaybe-uninitialized]
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

atmel_mxt_ts driver by Daniel and MT protocol addition for win8 devices.

Conflicts:
	drivers/input/touchscreen/atmel_mxt_ts.c

use threaded IRQs use IRQF_ONESHOT.

Check error returned by clk_prepare_enable().
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>