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Input: joydev - do not report stale values on first open 

commit 45536d373a21d441bd488f618b6e3e9bfae839f3 upstream.

Postpone axis initialization to the first open instead of doing it
in joydev_connect. This is to make sure the generated startup events
are representative of the current joystick state rather than what
it was when joydev_connect() was called, potentially much earlier.
Once the first user is connected to joydev node we'll be updating
joydev->abs[] values and subsequent clients will be getting correct
initial states as well.

This solves issues with joystick driven menus that start scrolling
up each time they are started, until the user moves the joystick to
generate events. In emulator menu setups where the menu program is
restarted every time the game exits, the repeated need to move the
joystick to stop the unintended scrolling gets old rather quickly...

Signed-off-by: Raphael Assenat <raph@raphnet.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Oliver Neukum <ONeukum@suse.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Raphael Assenat 2016-12-29 10:23:09 -08:00 committed by syphyr
parent ef7865840b
commit c2e42b9121
1 changed files with 13 additions and 5 deletions
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18
drivers/input/joydev.c
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@ -188,6 +188,17 @@ static void joydev_detach_client(struct joydev *joydev,
synchronize_rcu();
}
static void joydev_refresh_state(struct joydev *joydev)
{
struct input_dev *dev = joydev->handle.dev;
int i, val;
for (i = 0; i < joydev->nabs; i++) {
val = input_abs_get_val(dev, joydev->abspam[i]);
joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
}
}
static int joydev_open_device(struct joydev *joydev)
{
int retval;
@ -202,6 +213,8 @@ static int joydev_open_device(struct joydev *joydev)
retval = input_open_device(&joydev->handle);
if (retval)
joydev->open--;
else
joydev_refresh_state(joydev);
}
mutex_unlock(&joydev->mutex);
@ -823,7 +836,6 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
j = joydev->abspam[i];
if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
joydev->corr[i].type = JS_CORR_NONE;
joydev->abs[i] = input_abs_get_val(dev, j);
continue;
}
joydev->corr[i].type = JS_CORR_BROKEN;
@ -838,10 +850,6 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
if (t) {
joydev->corr[i].coef[2] = (1 << 29) / t;
joydev->corr[i].coef[3] = (1 << 29) / t;
joydev->abs[i] =
joydev_correct(input_abs_get_val(dev, j),
joydev->corr + i);
}
}