Input: walkera0701 - use module_parport_driver macro to simplify the code

Use the module_parport_driver macro to simplify the code, which is the
same as declaring with module_init() and module_exit().

Signed-off-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20230815080107.1089401-1-lizetao1@huawei.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Based on 2 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

docs: Fix some broken references

As we move stuff around, some doc references are broken. Fix some of
them via this script:
./scripts/documentation-file-ref-check --fix

Manually checked if the produced result is valid, removing a few
false-positives.

Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Coly Li <colyli@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>

ktime: Cleanup ktime_set() usage

ktime_set(S,N) was required for the timespec storage type and is still
useful for situations where a Seconds and Nanoseconds part of a time value
needs to be converted. For anything where the Seconds argument is 0, this
is pointless and can be replaced with a simple assignment.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>

Input: walkera0701 - clear unused function pointers

walkera0701_parport_cb is a local uninitialized structure and the member
function pointers will be pointing to arbitrary locations unless they
are cleared.

Fixes: 221bcb24c653 ("Input: walkera0701 - use parallel port device model")
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

remove abs64()

Switch everything to the new and more capable implementation of abs().
Mainly to give the new abs() a bit of a workout.

Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Input: walkera0701 - use parallel port device model

Modify walkera0701 driver to use the new Parallel Port device model.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Input: walkera0701 - fix abs() calculations on 64 bit values

abs() function can not be used with 64 bit values, so let's switch to
abs64(). From include/linux/kernel.h:

/*
* abs() handles unsigned and signed longs, ints, shorts and chars.
* For all input types abs() returns a signed long.
* abs() should not be used for 64-bit types (s64, u64, long long)
* - use abs64() for those.
*/

Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Input: walkera0701 - claim parport when opening the device

Postpone claiming the port until the device is opened, instead of doing
that when the driver is loaded.

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

Input: walkera0701 - use proper error codes

We have been using -EBUSY where we should have used -EIO or -ENOMEM,
so let's fix that and also add some diagnostic messages.

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

Input: walkera0701 - switch to using pr_xxx() for messages

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

Input: walkera0701 - set up input device's parent

This will place the joystick's input device into propoer place in sysfs
hierarchy as long as th port has device assigned to it (i.e. it is not
legacy port).

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

Input: walkera0701 - fix crash on startup

The driver's timer must be set up before enabling IRQ handler, otherwise
bad things may happen.

Reported-and-tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Peter Popovec <popovec@fei.tuke.sk>
CC: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Input: add joystick driver for Walkera WK-0701 RC transmitter

Signed-off-by: Peter Popovec <popovec@fei.tuke.sk>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>