Add custom Makefile for faster smoke-test rebuilds without spending time
in configure, autotools, document generation and/or rolling rpm packages.

Add multiple include protection to all header files.

Move function prototypes away from header files that included in the
development package.

Mass rename functions to have a prefix giving context for the function.
For the most part the prefix is derived from the name of the compilation
module containing the function.

Mass normalize indentation to four spaces in all source files.

Augment author lists on each source file based on git committers.

Remove "inline" attributes from not-really-inlineable functions.

Remove .gitignore.

Remove unused modules-android.c source file.

Define _GNU_SOURCE for whole build rather than in individual files.

Fix resource leaks here and there.

Try to avoid hard-coding android usb paths.

Add configfs backend for usb cadget configuration.

Probe supported backends (configfs, android usb, or kmod) on usb-moded
startup and make them mutually exclusive with each other.

Allow configfs and android usb control structures some time to show up
if usb-moded is started during device bootup.

Refactor udev event listener to utilize a state machine. Simplifies
book keeping and makes pc/charger detection heuristics easier to control.

Refactor mode selection to utilize three interconnected mini state machines.
Allows separating logically wanted mode from mode programmed to usb and
mode exposed over D-Bus.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Optionally force an USB function on bootup

See merge request !35

On some devices enumeration fails on the 1st connect after bootup unless
android usb has already been set up for some function at least once.

Add --android-bootup-function option that can be used on such devices
to force usb-moded to program some function and then clear the function
list when usb-moded is executed during device bootup.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Improves readability on narrow console sessions and allows writing
multi-line explanations when/if needed.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

There are situations where usb-moded needs to behave in slightly different
manner depending on whether it is executed as a part of device starup
sequence or (restarted) after the device is already fully booted up.

Make the related init-done functions available to all modules within
usb-moded source tree.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Make dsme message type identifiers unique

See merge request !34

There were non-unique dsme message type identifiers:
  0x00000320 = SET_THERMAL_STATUS = BATTERY_EMPTY_IND
  0x00000506 = PROCESSWD_PING = PROCESSWD_PONG

Replace custom get-message-type-name functions with common
functionality made available from libdsme.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Do not switch from undefined mode to charging fallback

See merge request !33

The charging_fallback() function has multiple return paths and does
not always clear timer id variable "charging_timeout". This can later
on lead to attempts to remove stale timer id - which causes glib to
emit warnings.

Clear the bookkeeping variable on entry to callback rather than just
one of the possible return points.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Compilation options such as: -Wno-unused-parameter and -Wno-unused-result
easily hide genuine issues.

Remove such relaxations and deal with issues that surface.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

If variables are used only from one source file, make them static.

If variables are truly global, put extern declaration to relevant header.

Drop completely unused variables.

Explicitly initialize variables to sane defaults.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Fix warnings about undocumented function arguments during documentation
build.

Fix incorrectly tagged structure/enum members.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

The usb_mode structure is by design used only within usb-moded.c
source file.

Clarify the intent by not exposing the structure in a header file.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

USB mode white-list configuration can get applied via D-Bus during bootup.
This requires re-evaluation of the currently active usb mode - which
misfires when nothing is connected to usb port and usb mode gets changed
from undefined to charging fallback (= charging from pc).

Add explicit check for undefined usb mode.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

When debugging it can be useful to get visibility to requests and
signals usb-moded receives over D-Bus.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Do not require android configuration block

See merge request !32

usb_moded_send_whitelisted_modes_signal() function is used without
including the header where the function is declared - which then
leads to compilation time warnings.

Fix the issue by adding the required #include statements.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Usb-moded does android usb initialization only if there is a non-empty
configuration block in the ini-files. This does not make sense anymore
as the values defined in the config file are used as fallback solution
if required data can't be obtained by other means.

If android_usb specific sysfs controls are present on the device, try
to initialize them regardless of whether ubs-moded configuration files
contain relevant information or not.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Suppress repetitive udev property warnings

See merge request !31

If usb-moded exits when it can't deduce cable connect state, it will
be restarted by systemd. As the usb-moded restarts are not going to
change how the udev status looks like, this repeats until systemd
moves the usb-moded service to failed state.

Do not exit and assume no usb-cable is connected. In addition to not
triggering restart spree, this has the additional benefit that the
usb-moded dbus interface stays available and signaling not-connected
state.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Usb-moded expects to see POWER_SUPPLY_PRESENT and POWER_SUPPLY_TYPE
properties defined for usb power-supply devices. When this is not
the case, it emits warnings and applies various fallbacks. Since the
properties get re-evaluated periodically, this also leads to the
same warnings being repeated.

Refactor the code so that in default verbosity the property warnings
are emitted only during what looks like cable connect / disconnect.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

Handle high voltage dedicated chargers

See merge request !30

While usb-moded correctly goes to charging-only mode when/if it sees
power supply type go through USB_DCP -> USB_HVDCP, it still complains
about unhandled USB_HVDCP type.

Explicitly treat receiving of high voltage dedicated charger profile
events as a charger connection.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

[usb] Add a whitelist property specifying allowed USB modes. Contributes to JB#33745

See merge request !28

Write dummy value to clear ffs function list

See merge request !29

It seems that kernels in many if not all devices ignore writing of empty
string to ffs function control file - the function list is left as it were
and this can cause subtle issues on the next cable connect. On the other
hand writing a non-existing "function" will clear the function list, but
causes write error to be reported.

Treat attempts to clear function list as a special case so that non-empty
string gets written and the resulting write error is ignored under normal
logging verbosity.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

When debugging order and timing of issues related to several processes
it is handy to have signals emitted by usb-moded in the journal along
with the other related logging.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

When debugging usb-moded it is time consuming to find where the
various debug messages originate from.

When logging to stderr, prefix the messages with source code
position info similar as gcc uses for reporting compilation
issues. This allows browsing usb-moded code with jump to the
next error functionality available in many text editors.

Since the amount of information passed to logging functions
is significantly increased, check whether the message would
be emitted or not before evaluating formatting parameters etc.

Also make variables relating to logging level, type, etc
available only via accessor functions.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

If the whitelist property exists in the conf file only modes that
appear in the list can be used or set as the default.  If a current
mode is removed from the whitelist the device will be put into charging
mode and if the default is removed that will be changed to ask.

Avoid recursion during dsmesock disconnecting

See merge request !27