touchpad: hook up click method configuration

Allow switching between softbuttons and clickfinger on any mt-capable
clickpad.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
[hdegoede@redhat.com] Keep top softbuttons working when enabling clickfinger
[hdegoede@redhat.com] Simply touchpad click method switching
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

4 files changed, 164 insertions, 73 deletions

diff --git a/doc/clickpad-softbuttons.dox b/doc/clickpad-softbuttons.dox
index 2653c3b7..d9ebfbbc 100644
--- a/doc/clickpad-softbuttons.dox
+++ b/doc/clickpad-softbuttons.dox
@@ -66,6 +66,12 @@ The Xorg synaptics driver uses 30% of the touchpad dimensions as threshold,
 libinput does not have this restriction. If two fingers are on the pad
 while clicking, that is a two-finger click.
 
+Clickfinger configuration can be enabled through the
+libinput_device_config_click_set_method() call. If clickfingers are
+enabled on a touchpad with top software buttons, the top area will keep
+acting as softbuttons for use with the trackpoint. Clickfingers will be used
+everywhere else on the touchpad.
+
 @section special_clickpads Special Clickpads
 
 The Lenovo *40 series laptops have a clickpad that provides two software button sections, one at
diff --git a/src/evdev-mt-touchpad-buttons.c b/src/evdev-mt-touchpad-buttons.c
index 6af3fcf1..ca7495f8 100644
--- a/src/evdev-mt-touchpad-buttons.c
+++ b/src/evdev-mt-touchpad-buttons.c
@@ -494,10 +494,9 @@ tp_release_all_buttons(struct tp_dispatch *tp,
 	}
 }
 
-void
+static void
 tp_init_softbuttons(struct tp_dispatch *tp,
-		    struct evdev_device *device,
-		    double topbutton_size_mult)
+		    struct evdev_device *device)
 {
 	int width, height;
 	const struct input_absinfo *absinfo_x, *absinfo_y;
@@ -523,6 +522,26 @@ tp_init_softbuttons(struct tp_dispatch *tp,
 	}
 
 	tp->buttons.bottom_area.rightbutton_left_edge = width/2 + xoffset;
+}
+
+void
+tp_init_top_softbuttons(struct tp_dispatch *tp,
+			struct evdev_device *device,
+			double topbutton_size_mult)
+{
+	int width, height;
+	const struct input_absinfo *absinfo_x, *absinfo_y;
+	int xoffset, yoffset;
+	int yres;
+
+	absinfo_x = device->abs.absinfo_x;
+	absinfo_y = device->abs.absinfo_y;
+
+	xoffset = absinfo_x->minimum,
+	yoffset = absinfo_y->minimum;
+	yres = absinfo_y->resolution;
+	width = abs(absinfo_x->maximum - absinfo_x->minimum);
+	height = abs(absinfo_y->maximum - absinfo_y->minimum);
 
 	if (tp->buttons.has_topbuttons) {
 		/* T440s has the top button line 5mm from the top, event
@@ -545,6 +564,89 @@ tp_init_softbuttons(struct tp_dispatch *tp,
 	}
 }
 
+static inline uint32_t
+tp_button_config_click_get_methods(struct libinput_device *device)
+{
+	struct evdev_device *evdev = (struct evdev_device*)device;
+	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;
+	uint32_t methods = LIBINPUT_CONFIG_CLICK_METHOD_NONE;
+
+	if (tp->buttons.is_clickpad) {
+		methods |= LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS;
+		if (tp->has_mt)
+			methods |= LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER;
+	}
+
+	return methods;
+}
+
+static void
+tp_switch_click_method(struct tp_dispatch *tp)
+{
+	/*
+	 * All we need to do when switching click methods is to change the
+	 * bottom_area.top_edge so that when in clickfinger mode the bottom
+	 * touchpad area is not dead wrt finger movement starting there.
+	 *
+	 * We do not need to take any state into account, fingers which are
+	 * already down will simply keep the state / area they have assigned
+	 * until they are released, and the post_button_events path is state
+	 * agnostic.
+	 */
+
+	switch (tp->buttons.click_method) {
+	case LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS:
+		tp_init_softbuttons(tp, tp->device);
+		break;
+	case LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER:
+	case LIBINPUT_CONFIG_CLICK_METHOD_NONE:
+		tp->buttons.bottom_area.top_edge = INT_MAX;
+		break;
+	}
+}
+
+static enum libinput_config_status
+tp_button_config_click_set_method(struct libinput_device *device,
+				  enum libinput_config_click_method method)
+{
+	struct evdev_device *evdev = (struct evdev_device*)device;
+	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;
+
+	tp->buttons.click_method = method;
+	tp_switch_click_method(tp);
+
+	return LIBINPUT_CONFIG_STATUS_SUCCESS;
+}
+
+static enum libinput_config_click_method
+tp_button_config_click_get_method(struct libinput_device *device)
+{
+	struct evdev_device *evdev = (struct evdev_device*)device;
+	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;
+
+	return tp->buttons.click_method;
+}
+
+static enum libinput_config_click_method
+tp_click_get_default_method(struct tp_dispatch *tp)
+{
+	if (!tp->buttons.is_clickpad)
+		return LIBINPUT_CONFIG_CLICK_METHOD_NONE;
+	else if (libevdev_get_id_vendor(tp->device->evdev) == VENDOR_ID_APPLE)
+		return LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER;
+	else
+		return LIBINPUT_CONFIG_CLICK_METHOD_BUTTON_AREAS;
+}
+
+static enum libinput_config_click_method
+tp_button_config_click_get_default_method(struct libinput_device *device)
+{
+	struct evdev_device *evdev = (struct evdev_device*)device;
+	struct tp_dispatch *tp = (struct tp_dispatch*)evdev->dispatch;
+
+	return tp_click_get_default_method(tp);
+}
+
 int
 tp_init_buttons(struct tp_dispatch *tp,
 		struct evdev_device *device)
@@ -582,15 +684,16 @@ tp_init_buttons(struct tp_dispatch *tp,
 
 	tp->buttons.motion_dist = diagonal * DEFAULT_BUTTON_MOTION_THRESHOLD;
 
-	if (libevdev_get_id_vendor(device->evdev) == VENDOR_ID_APPLE)
-		tp->buttons.use_clickfinger = true;
+	tp->buttons.config_method.get_methods = tp_button_config_click_get_methods;
+	tp->buttons.config_method.set_method = tp_button_config_click_set_method;
+	tp->buttons.config_method.get_method = tp_button_config_click_get_method;
+	tp->buttons.config_method.get_default_method = tp_button_config_click_get_default_method;
+	tp->device->base.config.click_method = &tp->buttons.config_method;
 
-	if (tp->buttons.is_clickpad && !tp->buttons.use_clickfinger) {
-		tp_init_softbuttons(tp, device, 1.0);
-	} else {
-		tp->buttons.bottom_area.top_edge = INT_MAX;
-		tp->buttons.top_area.bottom_edge = INT_MIN;
-	}
+	tp->buttons.click_method = tp_click_get_default_method(tp);
+	tp_switch_click_method(tp);
+
+	tp_init_top_softbuttons(tp, device, 1.0);
 
 	tp_for_each_touch(tp, t) {
 		t->button.state = BUTTON_STATE_NONE;
@@ -612,43 +715,6 @@ tp_remove_buttons(struct tp_dispatch *tp)
 }
 
 static int
-tp_post_clickfinger_buttons(struct tp_dispatch *tp, uint64_t time)
-{
-	uint32_t current, old, button;
-	enum libinput_button_state state;
-
-	current = tp->buttons.state;
-	old = tp->buttons.old_state;
-
-	if (current == old)
-		return 0;
-
-	if (current) {
-		switch (tp->nfingers_down) {
-		case 1: button = BTN_LEFT; break;
-		case 2: button = BTN_RIGHT; break;
-		case 3: button = BTN_MIDDLE; break;
-		default:
-			return 0;
-		}
-		tp->buttons.active = button;
-		state = LIBINPUT_BUTTON_STATE_PRESSED;
-	} else {
-		button = tp->buttons.active;
-		tp->buttons.active = 0;
-		state = LIBINPUT_BUTTON_STATE_RELEASED;
-	}
-
-	if (button) {
-		evdev_pointer_notify_button(tp->device,
-					    time,
-					    button,
-					    state);
-	}
-	return 1;
-}
-
-static int
 tp_post_physical_buttons(struct tp_dispatch *tp, uint64_t time)
 {
 	uint32_t current, old, button;
@@ -683,12 +749,12 @@ tp_post_physical_buttons(struct tp_dispatch *tp, uint64_t time)
 	return 0;
 }
 
-static void
-tp_notify_softbutton(struct tp_dispatch *tp,
-		     uint64_t time,
-		     uint32_t button,
-		     uint32_t is_topbutton,
-		     enum libinput_button_state state)
+static int
+tp_notify_clickpadbutton(struct tp_dispatch *tp,
+			 uint64_t time,
+			 uint32_t button,
+			 uint32_t is_topbutton,
+			 enum libinput_button_state state)
 {
 	/* If we've a trackpoint, send top buttons through the trackpoint */
 	if (is_topbutton && tp->buttons.trackpoint) {
@@ -702,18 +768,38 @@ tp_notify_softbutton(struct tp_dispatch *tp,
 		event.value = (state == LIBINPUT_BUTTON_STATE_PRESSED) ? 1 : 0;
 		dispatch->interface->process(dispatch, tp->buttons.trackpoint,
 					     &event, time);
-		return;
+		return 1;
 	}
 
 	/* Ignore button events not for the trackpoint while suspended */
 	if (tp->device->suspended)
-		return;
+		return 0;
+
+	/*
+	 * If the user has requested clickfinger replace the button chosen
+	 * by the softbutton code with one based on the number of fingers.
+	 */
+	if (tp->buttons.click_method == LIBINPUT_CONFIG_CLICK_METHOD_CLICKFINGER &&
+			state == LIBINPUT_BUTTON_STATE_PRESSED) {
+		switch (tp->nfingers_down) {
+		case 1: button = BTN_LEFT; break;
+		case 2: button = BTN_RIGHT; break;
+		case 3: button = BTN_MIDDLE; break;
+		default:
+			button = 0;
+		}
+		tp->buttons.active = button;
+
+		if (!button)
+			return 0;
+	}
 
 	evdev_pointer_notify_button(tp->device, time, button, state);
+	return 1;
 }
 
 static int
-tp_post_softbutton_buttons(struct tp_dispatch *tp, uint64_t time)
+tp_post_clickpadbutton_buttons(struct tp_dispatch *tp, uint64_t time)
 {
 	uint32_t current, old, button, is_top;
 	enum libinput_button_state state;
@@ -783,22 +869,18 @@ tp_post_softbutton_buttons(struct tp_dispatch *tp, uint64_t time)
 	tp->buttons.click_pending = false;
 
 	if (button)
-		tp_notify_softbutton(tp, time, button, is_top, state);
+		return tp_notify_clickpadbutton(tp, time, button, is_top, state);
 
-	return 1;
+	return 0;
 }
 
 int
 tp_post_button_events(struct tp_dispatch *tp, uint64_t time)
 {
-	if (tp->buttons.is_clickpad) {
-		if (tp->buttons.use_clickfinger)
-			return tp_post_clickfinger_buttons(tp, time);
-		else
-			return tp_post_softbutton_buttons(tp, time);
-	}
-
-	return tp_post_physical_buttons(tp, time);
+	if (tp->buttons.is_clickpad)
+		return tp_post_clickpadbutton_buttons(tp, time);
+	else
+		return tp_post_physical_buttons(tp, time);
 }
 
 int
diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index 53a0bf21..5221be60 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -938,7 +938,7 @@ tp_suspend(struct tp_dispatch *tp, struct evdev_device *device)
 	if (tp->buttons.has_topbuttons) {
 		evdev_notify_suspended_device(device);
 		/* Enlarge topbutton area while suspended */
-		tp_init_softbuttons(tp, device, 1.5);
+		tp_init_top_softbuttons(tp, device, 1.5);
 	} else {
 		evdev_device_suspend(device);
 	}
@@ -951,7 +951,7 @@ tp_resume(struct tp_dispatch *tp, struct evdev_device *device)
 		/* tap state-machine is offline while suspended, reset state */
 		tp_clear_state(tp);
 		/* restore original topbutton area size */
-		tp_init_softbuttons(tp, device, 1.0);
+		tp_init_top_softbuttons(tp, device, 1.0);
 		evdev_notify_resumed_device(device);
 	} else {
 		evdev_device_resume(device);
diff --git a/src/evdev-mt-touchpad.h b/src/evdev-mt-touchpad.h
index 7fe152a3..3479e5ea 100644
--- a/src/evdev-mt-touchpad.h
+++ b/src/evdev-mt-touchpad.h
@@ -243,7 +243,10 @@ struct tp_dispatch {
 		} top_area;
 
 		struct evdev_device *trackpoint;
-	} buttons;				/* physical buttons */
+
+		enum libinput_config_click_method click_method;
+		struct libinput_device_config_click_method config_method;
+	} buttons;
 
 	struct {
 		struct libinput_device_config_scroll_method config_method;
@@ -306,9 +309,9 @@ int
 tp_init_buttons(struct tp_dispatch *tp, struct evdev_device *device);
 
 void
-tp_init_softbuttons(struct tp_dispatch *tp,
-		    struct evdev_device *device,
-		    double topbutton_size_mult);
+tp_init_top_softbuttons(struct tp_dispatch *tp,
+			struct evdev_device *device,
+			double topbutton_size_mult);
 
 void
 tp_remove_buttons(struct tp_dispatch *tp);