Added scale ioctl to LSM303D driver

src/drivers/lsm303d/lsm303d.cpp

@@ -705,6 +705,23 @@ LSM303D::ioctl(struct file *filp, int cmd, unsigned long arg)
 		else
 			return -EINVAL;
 
+	case ACCELIOCSSCALE:
+		{
+			/* copy scale, but only if off by a few percent */
+			struct accel_scale *s = (struct accel_scale *) arg;
+			float sum = s->x_scale + s->y_scale + s->z_scale;
+			if (sum > 2.0f && sum < 4.0f) {
+				memcpy(&_accel_scale, s, sizeof(_accel_scale));
+				return OK;
+			} else {
+				return -EINVAL;
+			}
+		}
+
+	case ACCELIOCGSCALE:
+		/* copy scale out */
+		memcpy((struct accel_scale *) arg, &_accel_scale, sizeof(_accel_scale));
+		return OK;
 
 	default:
 		/* give it to the superclass */