accel: Add support for the new "accel-*" IIO labels

See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9a6df4b1ab0e467f23ccdcbb82700cfb3eaf44a3

src/accel-attributes.c

@@ -24,6 +24,11 @@ setup_accel_location (GUdevDevice *device)
 		g_warning ("Failed to parse ACCEL_LOCATION ('%s') from udev",
 			   location);
 	}
+	location = g_udev_device_get_sysfs_attr (device, "label");
+	if (location) {
+		if (parse_accel_label (location, &ret))
+			return ret;
+	}
 	location = g_udev_device_get_sysfs_attr (device, "location");
 	if (location) {
 		if (parse_accel_location (location, &ret))
@@ -38,6 +43,23 @@ setup_accel_location (GUdevDevice *device)
 	return ret;
 }
 
+gboolean
+parse_accel_label (const char *location, AccelLocation *value)
+{
+	if (location == NULL ||
+	    *location == '\0')
+		return FALSE;
+	if (g_str_equal (location, "accel-base")) {
+		*value = ACCEL_LOCATION_BASE;
+		return TRUE;
+	} else if (g_str_equal (location, "accel-display")) {
+		*value = ACCEL_LOCATION_DISPLAY;
+		return TRUE;
+	}
+	g_debug ("Failed to parse label '%s' as a location", location);
+	return FALSE;
+}
+
 gboolean
 parse_accel_location (const char *location, AccelLocation *value)
 {

src/accel-attributes.h

@@ -22,5 +22,7 @@ AccelLocation setup_accel_location (GUdevDevice *device);
 
 gboolean parse_accel_location (const char    *location,
                                AccelLocation *value);
+gboolean parse_accel_label (const char    *location,
+                            AccelLocation *value);
 
 gboolean get_accel_scale (GUdevDevice *device, AccelScale *scale_vec);

src/test-accel-location.c

@@ -13,6 +13,28 @@
 #define VALID_BASE_LOCATION "base"
 #define INVALID_LOCATION "invalid"
 
+#define VALID_DISPLAY_LOCATION_LABEL "accel-display"
+#define VALID_BASE_LOCATION_LABEL "accel-base"
+#define INVALID_LOCATION_LABEL "proximity-foo-bar"
+
+static void
+test_accel_label (void)
+{
+	AccelLocation location;
+
+	/* display location */
+	g_assert_true (parse_accel_label (VALID_DISPLAY_LOCATION_LABEL, &location));
+	g_assert_true (location == ACCEL_LOCATION_DISPLAY);
+
+	/* base location */
+	g_assert_true (parse_accel_label (VALID_BASE_LOCATION_LABEL, &location));
+	g_assert_true (location == ACCEL_LOCATION_BASE);
+
+	/* invalid label */
+	g_assert_false (parse_accel_location (NULL, &location));
+	g_assert_false (parse_accel_location (INVALID_LOCATION_LABEL, &location));
+}
+
 static void
 test_accel_location (void)
 {
@@ -41,6 +63,7 @@ int main (int argc, char **argv)
 	g_test_init (&argc, &argv, NULL);
 
 	g_test_add_func ("/iio-sensor-proxy/accel-location", test_accel_location);
+	g_test_add_func ("/iio-sensor-proxy/accel-label", test_accel_label);
 
 	return g_test_run ();
 }