compositor-{drm, fbdev, rpi}: Make VT switching configurable

Add a new boolean weston.ini option, "vt-switching" to enable or
disable Ctrl-Alt-Fn key combinations.

Signed-off-by: Bob Ham <bob.ham@collabora.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>

(Derek Foreman changed the prototype for switch_vt_binding to
have a weston_keyboard * instead of weston_seat *.  The pointer
wasn't used, so this is just a warning fix.)

man/weston.ini.man

@@ -455,6 +455,12 @@ sets the default state of the numlock on weston startup for the backends which
 support it.
 .RE
 .RE
+.TP 7
+.BI "vt-switching=" "true"
+Whether to allow the use of Ctrl+Alt+Fn key combinations to switch away from
+the compositor's virtual console.
+.RE
+.RE
 .SH "TERMINAL SECTION"
 Contains settings for the weston terminal application (weston-terminal). It
 allows to customize the font and shell of the command line interface.

src/compositor-drm.c

@@ -2815,15 +2815,6 @@ session_notify(struct wl_listener *listener, void *data)
 	};
 }
 
-static void
-switch_vt_binding(struct weston_keyboard *keyboard, uint32_t time,
-		  uint32_t key, void *data)
-{
-	struct weston_compositor *compositor = data;
-
-	weston_launcher_activate_vt(compositor->launcher, key - KEY_F1 + 1);
-}
-
 /*
  * Find primary GPU
  * Some systems may have multiple DRM devices attached to a single seat. This
@@ -3076,7 +3067,6 @@ drm_backend_create(struct weston_compositor *compositor,
 	struct udev_device *drm_device;
 	struct wl_event_loop *loop;
 	const char *path;
-	uint32_t key;
 
 	weston_log("initializing drm backend\n");
 
@@ -3152,10 +3142,7 @@ drm_backend_create(struct weston_compositor *compositor,
 
 	b->prev_state = WESTON_COMPOSITOR_ACTIVE;
 
-	for (key = KEY_F1; key < KEY_F9; key++)
-		weston_compositor_add_key_binding(compositor, key,
-						  MODIFIER_CTRL | MODIFIER_ALT,
-						  switch_vt_binding, compositor);
+	weston_setup_vt_switch_bindings(compositor);
 
 	wl_list_init(&b->sprite_list);
 	create_sprites(b);

src/compositor-fbdev.c

@@ -741,15 +741,6 @@ fbdev_restore(struct weston_compositor *compositor)
 	weston_launcher_restore(compositor->launcher);
 }
 
-static void
-switch_vt_binding(struct weston_keyboard *keyboard, uint32_t time,
-		  uint32_t key, void *data)
-{
-	struct weston_compositor *compositor = data;
-
-	weston_launcher_activate_vt(compositor->launcher, key - KEY_F1 + 1);
-}
-
 static struct fbdev_backend *
 fbdev_backend_create(struct weston_compositor *compositor, int *argc, char *argv[],
                      struct weston_config *config,
@@ -757,7 +748,6 @@ fbdev_backend_create(struct weston_compositor *compositor, int *argc, char *argv
 {
 	struct fbdev_backend *backend;
 	const char *seat_id = default_seat;
-	uint32_t key;
 
 	weston_log("initializing fbdev backend\n");
 
@@ -794,11 +784,8 @@ fbdev_backend_create(struct weston_compositor *compositor, int *argc, char *argv
 	backend->prev_state = WESTON_COMPOSITOR_ACTIVE;
 	backend->use_pixman = !param->use_gl;
 
-	for (key = KEY_F1; key < KEY_F9; key++)
-		weston_compositor_add_key_binding(compositor, key,
-		                                  MODIFIER_CTRL | MODIFIER_ALT,
-		                                  switch_vt_binding,
-		                                  compositor);
+	weston_setup_vt_switch_bindings(compositor);
+
 	if (backend->use_pixman) {
 		if (pixman_renderer_init(compositor) < 0)
 			goto out_launcher;

src/compositor-rpi.c

@@ -37,7 +37,6 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-#include <linux/input.h>
 #include <libudev.h>
 
 #ifdef HAVE_BCM_HOST
@@ -448,15 +447,6 @@ rpi_restore(struct weston_compositor *compositor)
 	weston_launcher_restore(compositor->launcher);
 }
 
-static void
-switch_vt_binding(struct weston_keyboard *keyboard, uint32_t time,
-		  uint32_t key, void *data)
-{
-	struct weston_compositor *compositor = data;
-
-	weston_launcher_activate_vt(compositor->launcher, key - KEY_F1 + 1);
-}
-
 struct rpi_parameters {
 	int tty;
 	struct rpi_renderer_parameters renderer;
@@ -468,7 +458,6 @@ rpi_backend_create(struct weston_compositor *compositor,
 		   struct rpi_parameters *param)
 {
 	struct rpi_backend *backend;
-	uint32_t key;
 
 	weston_log("initializing Raspberry Pi backend\n");
 
@@ -506,10 +495,7 @@ rpi_backend_create(struct weston_compositor *compositor,
 	weston_log("Dispmanx planes are %s buffered.\n",
 		   backend->single_buffer ? "single" : "double");
 
-	for (key = KEY_F1; key < KEY_F9; key++)
-		weston_compositor_add_key_binding(compositor, key,
-						  MODIFIER_CTRL | MODIFIER_ALT,
-						  switch_vt_binding, compositor);
+	weston_setup_vt_switch_bindings(compositor);
 
 	/*
 	 * bcm_host_init() creates threads.

src/compositor.h

@@ -751,6 +751,8 @@ struct weston_compositor {
 	int32_t kb_repeat_rate;
 	int32_t kb_repeat_delay;
 
+	bool vt_switching;
+
 	clockid_t presentation_clock;
 	int32_t repaint_msec;
 

src/launcher-util.c

@@ -32,6 +32,7 @@
 #include "launcher-impl.h"
 
 #include <unistd.h>
+#include <linux/input.h>
 
 static struct launcher_interface *ifaces[] = {
 #ifdef HAVE_SYSTEMD_LOGIN
@@ -89,3 +90,28 @@ weston_launcher_restore(struct weston_launcher *launcher)
 {
 	launcher->iface->restore(launcher);
 }
+
+
+static void
+switch_vt_binding(struct weston_keyboard *keyboard,
+		  uint32_t time, uint32_t key, void *data)
+{
+	struct weston_compositor *compositor = data;
+
+	weston_launcher_activate_vt(compositor->launcher, key - KEY_F1 + 1);
+}
+
+WL_EXPORT void
+weston_setup_vt_switch_bindings(struct weston_compositor *compositor)
+{
+	uint32_t key;
+
+	if (compositor->vt_switching == false)
+		return;
+
+	for (key = KEY_F1; key < KEY_F9; key++)
+		weston_compositor_add_key_binding(compositor, key,
+						  MODIFIER_CTRL | MODIFIER_ALT,
+						  switch_vt_binding,
+						  compositor);
+}

src/launcher-util.h

@@ -52,4 +52,7 @@ weston_launcher_activate_vt(struct weston_launcher *launcher, int vt);
 void
 weston_launcher_restore(struct weston_launcher *launcher);
 
+void
+weston_setup_vt_switch_bindings(struct weston_compositor *compositor);
+
 #endif

src/main.c

@@ -499,6 +499,7 @@ weston_compositor_init_config(struct weston_compositor *ec,
 	struct xkb_rule_names xkb_names;
 	struct weston_config_section *s;
 	int repaint_msec;
+	int vt_switching;
 
 	s = weston_config_get_section(config, "keyboard", NULL, NULL);
 	weston_config_section_get_string(s, "keymap_rules",
@@ -520,6 +521,10 @@ weston_compositor_init_config(struct weston_compositor *ec,
 	weston_config_section_get_int(s, "repeat-delay",
 				      &ec->kb_repeat_delay, 400);
 
+	weston_config_section_get_bool(s, "vt-switching",
+				       &vt_switching, true);
+	ec->vt_switching = vt_switching;
+
 	s = weston_config_get_section(config, "core", NULL, NULL);
 	weston_config_section_get_int(s, "repaint-window", &repaint_msec,
 				      ec->repaint_msec);