tools: print out evdev override udev rule from touchpad edge detector

We're starting to collect overrides for custom devices, making this easier for
users and saves us time. Once we measured everything, print out a
guesstimated udev rule and instructions on how to calculate the resolution.
Extra output now is:

	Touchpad size as listed by the kernel: 132x111mm
	Calculate resolution as:
		x axis: 6076/<width in mm>
		y axis: 5021/<height in mm>

	Suggested udev rule:
	# <Laptop model description goes here>
	evdev:input:b0005v05ACp030E*
	 EVDEV_ABS_01=-2694:2862:<x resolution>
	 EVDEV_ABS_02=-20:121:<y resolution>
	 EVDEV_ABS_35=-2694:2862:<x resolution>
	 EVDEV_ABS_36=-20:121:<y resolution>

The ABS_MT_ axes are only printed if the device have them, if the device isn't
bluetooth/usb we print the dmi modalias instead.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 81 insertions, 1 deletions

diff --git a/tools/touchpad-edge-detector.c b/tools/touchpad-edge-detector.c
index fdc496e..4dbae11 100644
--- a/tools/touchpad-edge-detector.c
+++ b/tools/touchpad-edge-detector.c
@@ -136,6 +136,85 @@ mainloop(struct libevdev *dev, struct dimensions *dim) {
 	return 0;
 }
 
+static inline void
+pid_vid_matchstr(struct libevdev *dev, char *match, size_t sz)
+{
+	snprintf(match, sz, "input:b%04Xv%04Xp%04X",
+		libevdev_get_id_bustype(dev),
+		libevdev_get_id_vendor(dev),
+		libevdev_get_id_product(dev));
+}
+
+static inline void
+dmi_matchstr(struct libevdev *dev, char *match, size_t sz)
+{
+	char modalias[PATH_MAX];
+	FILE *fp;
+
+	fp = fopen("/sys/class/dmi/id/modalias", "r");
+	if (!fp || fgets(modalias, sizeof(modalias), fp) == NULL) {
+		sprintf(match, "ERROR READING DMI MODALIAS");
+		if (fp)
+			fclose(fp);
+		return;
+	}
+
+	fclose(fp);
+
+	modalias[strlen(modalias) - 1] = '\0'; /* drop \n */
+	snprintf(match, sz, "name:%s:%s", libevdev_get_name(dev), modalias);
+
+	return;
+}
+
+static void
+print_udev_override_rule(struct libevdev *dev, const struct dimensions *dim) {
+	const struct input_absinfo *x, *y;
+	char match[PATH_MAX];
+	int w, h;
+
+	x = libevdev_get_abs_info(dev, ABS_X);
+	y = libevdev_get_abs_info(dev, ABS_Y);
+	w = x->maximum - x->minimum;
+	h = y->maximum - y->minimum;
+
+	if (x->resolution && y->resolution) {
+		printf("Touchpad size as listed by the kernel: %dx%dmm\n",
+		       w/x->resolution, h/y->resolution);
+	} else {
+		printf("Touchpad has no resolution, size unknown\n");
+	}
+
+	printf("Calculate resolution as:\n");
+	printf("	x axis: %d/<width in mm>\n", w);
+	printf("	y axis: %d/<height in mm>\n", h);
+	printf("\n");
+	printf("Suggested udev rule:\n");
+
+	switch(libevdev_get_id_bustype(dev)) {
+	case BUS_USB:
+	case BUS_BLUETOOTH:
+		pid_vid_matchstr(dev, match, sizeof(match));
+		break;
+	default:
+		dmi_matchstr(dev, match, sizeof(match));
+		break;
+	}
+
+	printf("# <Laptop model description goes here>\n"
+	       "evdev:%s*\n"
+	       " EVDEV_ABS_01=%d:%d:<x resolution>\n"
+	       " EVDEV_ABS_02=%d:%d:<y resolution>\n",
+	       match,
+	       dim->left, dim->right,
+	       dim->top, dim->bottom);
+	if (libevdev_has_event_code(dev, EV_ABS, ABS_MT_POSITION_X))
+		printf(" EVDEV_ABS_35=%d:%d:<x resolution>\n"
+		       " EVDEV_ABS_36=%d:%d:<y resolution>\n",
+		       dim->left, dim->right,
+		       dim->top, dim->bottom);
+}
+
 int main (int argc, char **argv) {
 	int rc;
 	int fd;
@@ -192,8 +271,9 @@ int main (int argc, char **argv) {
 	setbuf(stdout, NULL);
 
 	rc = mainloop(dev, &dim);
+	printf("\n\n");
 
-	printf("\n");
+	print_udev_override_rule(dev, &dim);
 
 out:
 	libevdev_free(dev);