libinput: add support for touchscreen set matrix

My android pad emit a strange touch input from libinput, need to rotate it in 270 degree clockwise to fix.

docs/rc.xml.all

@@ -504,6 +504,9 @@
       - tapButtonMap [lrm|lmr]
       - clickMethod [none|buttonAreas|clickfinger]
       - sendEventsMode [yes|no|disabledOnExternalMouse]
+      - calibrationMatrix [six float values split by space],
+      visit https://wayland.freedesktop.org/libinput/doc/latest/absolute-axes.html#calibration-of-absolute-devices
+      for more information
   -->
   <libinput>
     <device category="default">
@@ -519,6 +522,7 @@
       <disableWhileTyping></disableWhileTyping>
       <clickMethod></clickMethod>
       <sendEventsMode></sendEventsMode>
+      <calibrationMatrix></calibrationMatrix>
     </device>
   </libinput>
 

include/config/libinput.h

@@ -23,13 +23,15 @@ struct libinput_category {
 	int left_handed;
 	enum libinput_config_tap_state tap;
 	enum libinput_config_tap_button_map tap_button_map;
-	int tap_and_drag;     /* -1 or libinput_config_drag_state */
-	int drag_lock;        /* -1 or libinput_config_drag_lock_state */
-	int accel_profile;    /* -1 or libinput_config_accel_profile */
-	int middle_emu;       /* -1 or libinput_config_middle_emulation_state */
-	int dwt;              /* -1 or libinput_config_dwt_state */
-	int click_method;     /* -1 or libinput_config_click_method */
-	int send_events_mode; /* -1 or libinput_config_send_events_mode */
+	int tap_and_drag;               /* -1 or libinput_config_drag_state */
+	int drag_lock;                  /* -1 or libinput_config_drag_lock_state */
+	int accel_profile;              /* -1 or libinput_config_accel_profile */
+	int middle_emu;                 /* -1 or libinput_config_middle_emulation_state */
+	int dwt;                        /* -1 or libinput_config_dwt_state */
+	int click_method;               /* -1 or libinput_config_click_method */
+	int send_events_mode;           /* -1 or libinput_config_send_events_mode */
+	bool no_calibration_matrix;     /* false if have calibration matrix */
+	float calibration_matrix[6];    /* calibration matrix */
 };
 
 enum lab_libinput_device_type get_device_type(const char *s);

src/config/libinput.c

@@ -25,6 +25,7 @@ libinput_category_init(struct libinput_category *l)
 	l->dwt = -1;
 	l->click_method = -1;
 	l->send_events_mode = -1;
+	l->no_calibration_matrix = true;
 }
 
 enum lab_libinput_device_type

src/config/rcxml.c

@@ -611,6 +611,12 @@ fill_libinput_category(char *nodename, char *content)
 	} else if (!strcasecmp(nodename, "sendEventsMode")) {
 		current_libinput_category->send_events_mode =
 			get_send_events_mode(content);
+	} else if (!strcasecmp(nodename, "calibrationMatrix")) {
+		float *m = current_libinput_category->calibration_matrix;
+		int r = sscanf(content, "%f%f%f%f%f%f", &m[0], &m[1], &m[2], &m[3], &m[4], &m[5]);
+		if (r == 6) {
+			current_libinput_category->no_calibration_matrix = false;
+		}
 	}
 }
 

src/seat.c

@@ -237,6 +237,14 @@ configure_libinput(struct wlr_input_device *wlr_input_device)
 		wlr_log(WLR_INFO, "send events mode configured");
 		libinput_device_config_send_events_set_mode(libinput_dev, dc->send_events_mode);
 	}
+
+	if (libinput_device_config_calibration_has_matrix(libinput_dev) == 0
+			|| dc->no_calibration_matrix) {
+		wlr_log(WLR_INFO, "calibration matrix not configured");
+	} else {
+		wlr_log(WLR_INFO, "calibration matrix configured");
+		libinput_device_config_calibration_set_matrix(libinput_dev, dc->calibration_matrix);
+	}
 }
 
 static struct wlr_output *