Now that we have run-time changes of the tap.enabled state move the check
to the IDLE state only. Otherwise the tap machine may hang if tapping is
disabled while a gesture is in progress.

Two basic tests are added to check for the tap default setting - which is now
"tap disabled by default", because a bike shed's correct color is green.

Signed-off-by: Peter Hutterer <[email protected]>
---
 src/evdev-mt-touchpad-tap.c | 56 +++++++++++++++++++++++++++++++++++++++------
 src/evdev-mt-touchpad.h     |  1 +
 test/touchpad.c             | 32 ++++++++++++++++++++++++++
 3 files changed, 82 insertions(+), 7 deletions(-)

diff --git a/src/evdev-mt-touchpad-tap.c b/src/evdev-mt-touchpad-tap.c
index eee334f..24ea8c3 100644
--- a/src/evdev-mt-touchpad-tap.c
+++ b/src/evdev-mt-touchpad-tap.c
@@ -438,13 +438,13 @@ static void
 tp_tap_handle_event(struct tp_dispatch *tp, enum tap_event event, uint64_t 
time)
 {
        enum tp_tap_state current;
-       if (!tp->tap.enabled)
-               return;
 
        current = tp->tap.state;
 
        switch(tp->tap.state) {
        case TAP_STATE_IDLE:
+               if (!tp->tap.enabled)
+                       break;
                tp_tap_idle_handle_event(tp, event, time);
                break;
        case TAP_STATE_TOUCH:
@@ -572,9 +572,6 @@ tp_tap_timeout_handler(void *data)
 unsigned int
 tp_tap_handle_timeout(struct tp_dispatch *tp, uint64_t time)
 {
-       if (!tp->tap.enabled)
-               return 0;
-
        if (tp->tap.timeout && tp->tap.timeout <= time) {
                tp_tap_clear_timer(tp);
                tp_tap_handle_event(tp, TAP_EVENT_TIMEOUT, time);
@@ -583,9 +580,56 @@ tp_tap_handle_timeout(struct tp_dispatch *tp, uint64_t 
time)
        return tp->tap.timeout;
 }
 
+static int
+tp_tap_config_count(struct libinput_device *device)
+{
+       struct evdev_dispatch *dispatch = ((struct evdev_device 
*)device)->dispatch;
+       struct tp_dispatch *tp = container_of(dispatch, tp, base);
+
+       return min(tp->ntouches, 3); /* we only do up to 3 finger tap */
+}
+
+static enum libinput_config_status
+tp_tap_config_enable(struct libinput_device *device, int enabled)
+{
+       struct evdev_dispatch *dispatch = ((struct evdev_device 
*)device)->dispatch;
+       struct tp_dispatch *tp = container_of(dispatch, tp, base);
+
+       if (tp_tap_config_count(device) == 0)
+               return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;
+
+       tp->tap.enabled = enabled;
+
+       return LIBINPUT_CONFIG_STATUS_SUCCESS;
+}
+
+static int
+tp_tap_config_is_enabled(struct libinput_device *device)
+{
+       struct evdev_dispatch *dispatch = ((struct evdev_device 
*)device)->dispatch;
+       struct tp_dispatch *tp = container_of(dispatch, tp, base);
+
+       return tp->tap.enabled;
+}
+
+static void
+tp_tap_config_reset(struct libinput_device *device)
+{
+       struct evdev_dispatch *dispatch = ((struct evdev_device 
*)device)->dispatch;
+       struct tp_dispatch *tp = container_of(dispatch, tp, base);
+
+       tp->tap.enabled = false;
+}
+
 int
 tp_init_tap(struct tp_dispatch *tp)
 {
+       tp->tap.config.count = tp_tap_config_count;
+       tp->tap.config.enable = tp_tap_config_enable;
+       tp->tap.config.is_enabled = tp_tap_config_is_enabled;
+       tp->tap.config.reset = tp_tap_config_reset;
+       tp->device->base.config.tap = &tp->tap.config;
+
        tp->tap.state = TAP_STATE_IDLE;
        tp->tap.timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
 
@@ -603,8 +647,6 @@ tp_init_tap(struct tp_dispatch *tp)
                return -1;
        }
 
-       tp->tap.enabled = 1; /* FIXME */
-
        return 0;
 }
 
diff --git a/src/evdev-mt-touchpad.h b/src/evdev-mt-touchpad.h
index d514ed6..0b31e9a 100644
--- a/src/evdev-mt-touchpad.h
+++ b/src/evdev-mt-touchpad.h
@@ -203,6 +203,7 @@ struct tp_dispatch {
 
        struct {
                bool enabled;
+               struct libinput_device_config_tap config;
                int timer_fd;
                struct libinput_source *source;
                unsigned int timeout;
diff --git a/test/touchpad.c b/test/touchpad.c
index 35781c3..060b529 100644
--- a/test/touchpad.c
+++ b/test/touchpad.c
@@ -116,6 +116,8 @@ START_TEST(touchpad_1fg_tap)
        struct libinput *li = dev->libinput;
        struct libinput_event *event;
 
+       libinput_device_config_tap_enable(dev->libinput_device, 1);
+
        litest_drain_events(li);
 
        litest_touch_down(dev, 0, 50, 50);
@@ -141,6 +143,8 @@ START_TEST(touchpad_1fg_tap_n_drag)
        struct libinput *li = dev->libinput;
        struct libinput_event *event;
 
+       libinput_device_config_tap_enable(dev->libinput_device, 1);
+
        litest_drain_events(li);
 
        litest_touch_down(dev, 0, 50, 50);
@@ -194,6 +198,8 @@ START_TEST(touchpad_2fg_tap)
        struct libinput *li = dev->libinput;
        struct libinput_event *event;
 
+       libinput_device_config_tap_enable(dev->libinput_device, 1);
+
        litest_drain_events(dev->libinput);
 
        litest_touch_down(dev, 0, 50, 50);
@@ -349,6 +355,30 @@ START_TEST(clickpad_click_n_drag)
 }
 END_TEST
 
+START_TEST(touchpad_tap_is_available)
+{
+       struct litest_device *dev = litest_current_device();
+
+       
ck_assert_int_ge(libinput_device_config_tap_get_finger_count(dev->libinput_device),
 1);
+       
ck_assert_int_eq(libinput_device_config_tap_is_enabled(dev->libinput_device), 
0);
+}
+END_TEST
+
+START_TEST(touchpad_tap_is_not_available)
+{
+       struct litest_device *dev = litest_current_device();
+
+       
ck_assert_int_eq(libinput_device_config_tap_get_finger_count(dev->libinput_device),
 0);
+       
ck_assert_int_eq(libinput_device_config_tap_is_enabled(dev->libinput_device), 
0);
+       
ck_assert_int_eq(libinput_device_config_tap_enable(dev->libinput_device, 1),
+                        LIBINPUT_CONFIG_STATUS_UNSUPPORTED);
+
+       /* doesn't do anything but tests for null-pointer derefernce */
+       libinput_device_config_tap_reset(dev->libinput_device);
+}
+END_TEST
+
+
 int main(int argc, char **argv) {
 
        litest_add("touchpad:motion", touchpad_1fg_motion, LITEST_TOUCHPAD, 
LITEST_ANY);
@@ -357,6 +387,8 @@ int main(int argc, char **argv) {
        litest_add("touchpad:tap", touchpad_1fg_tap, LITEST_TOUCHPAD, 
LITEST_ANY);
        litest_add("touchpad:tap", touchpad_1fg_tap_n_drag, LITEST_TOUCHPAD, 
LITEST_ANY);
        litest_add("touchpad:tap", touchpad_2fg_tap, LITEST_TOUCHPAD, 
LITEST_SINGLE_TOUCH);
+       litest_add("touchpad:tap", touchpad_tap_is_available, LITEST_TOUCHPAD, 
LITEST_ANY);
+       litest_add("touchpad:tap", touchpad_tap_is_not_available, LITEST_ANY, 
LITEST_TOUCHPAD);
 
        litest_add_no_device("touchpad:clickfinger", touchpad_1fg_clickfinger);
        litest_add_no_device("touchpad:clickfinger", touchpad_2fg_clickfinger);
-- 
1.9.0

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