6 struct sball *sball_open(const char *dev);
7 void sball_close(struct sball *sb);
8 int sball_fd(struct sball *sb);
9 int sball_read(struct sball *sb);
11 int sball_axis(struct sball *sb, int axis);
12 unsigned int sball_buttons(struct sball *sb);
13 int sball_num_buttons(struct sball *sb);