src/sys/dev/evdev/cdev.c, branch release/13.1.0

evdev: Multitouch code style changes.

2021-09-07T23:55:12+00:00

1. Move touch count reporting helpers to utils. They are not multitouch.
2. Use evdev_mt prefix for private multitouch support routines.
3. Use int instead of int32_t where fixed size is not required.
4. Export some internal functions.

This change should be no-op.

(cherry picked from commit 98a7606b85e05132f328a2498dccab78df31cb7e)

evdev: Make variable-size ioctls return actual length of copyouted data

2021-01-20T20:10:07+00:00

on success instead of 0 to match Linux.
Imprivata binary depends on this.

Submitted by:	Shunchao Hu 
Reviewed by:	wulf
Differential revision:	https://reviews.freebsd.org/D28218

hid: Add missing input enter/exit epoch pairs.

2021-01-14T20:04:47+00:00

This was affecting unloading keyboard driver and kdb-related code.

evdev: Allow open() handler to be interrupted by a signal

2021-01-07T23:18:42+00:00

It is possible that the client list lock is taken by other process for too
long due to e.g. IO timeouts. Allow user to terminate open() in this case.

Reviewed by:	markj (as part of D27865)

evdev: Make open(2) and close(3) handlers sleepable.

2021-01-07T23:18:41+00:00

At the beginning of evdev there was a LOR between hardware driver's and
evdev client list locks as they were taken in different order at
driver's interrupt and evdev open()/close() handlers.

The LOR was fixed with introduction of evdev_register_mtx() function
which allowed to use a hardware driver's lock as evdev client list lock.
While this works good with PS/2 and USB, this does not work with I2C.
Unlike PS/2 and USB, I2C open()/close() handlers do unbound sleeps
while waiting for I2C bus to release and while performing IO.
This change uses epoch(9) for traversing evdev client list in interrupt
handler to avoid the LOR thus making possible to convert evdev client
list lock to sleepable sx.

While here add brief locking protocol description.

Reviewed by:	markj
Differential revision:	https://reviews.freebsd.org/D27865

evdev: return error rather than zero-length data on blocked read()

2020-03-29T23:01:36+00:00

if blocked process has been woken up by evdev device destruction.

MFC after:	2 weeks

evdev: Add COMPAT_FREEBSD32 support for amd64 arch

2020-03-29T23:00:33+00:00

Incompatibility between i386 and amd64 evdev ABIs was caused by presence of
'struct timeval' in evdev protocol. Replace it with 'struct timeval32' for
32 bit binaries.

Big-endian platforms may require additional work due to bitstr_t (array of
unsigned longs) usage in ioctl interface.

MFC after:	2 weeks

evdev: disable evdev if it is invoked from KDB or panic context

2018-10-27T21:04:34+00:00

This allow to prevent deadlock on entering KDB if one of evdev locks is
already taken by userspace process.

Also this change discards all but LED console events produced by KDB as
unrelated to userspace.

Tested by:	dumbbell (as part of D15070)
Objected by:	bde (as 'KDB lock an already locked mutex' problem solution)
MFC after:	1 month

evdev: remove soft context from evdev methods parameter list.

2018-08-13T19:00:42+00:00

Now softc should be retrieved from struct edvev * pointer
with evdev_get_softc() helper.

wmt(4) is a sample of driver that support both KPI.

Reviewed by:	hselasky, gonzo
Differential Revision:	https://reviews.freebsd.org/D16614

Change my email address to wulf@FreeBSD.org in copyright headers.

2017-07-23T20:41:58+00:00

Approved by:	gonzo (mentor)
MFC after:	2 weeks