12.2.2 触摸屏设备驱动中数据结构

1  typedef struct
2  {
3    unsigned int penStatus; /* PEN_UP, PEN_DOWN, PEN_SAMPLE */
4    TS_RET buf[MAX_TS_BUF]; /* 缓冲区 */
5    unsigned int head, tail; /* 缓冲区头和尾 */
6    wait_queue_head_t wq; /*等待队列*/
7    spinlock_t lock;
8    #ifdef USE_ASYNC
9      struct fasync_struct *aq;
10   #endif
11   struct cdev cdev;
12 } TS_DEV;

1 typedef struct 
2 {
3   unsigned short pressure;//PEN_DOWN、PEN_UP
4   unsigned short x;//x坐标
5   unsigned short y;//y坐标
6   unsigned short pad;
7 } TS_RET;

1  static struct file_operations s3c2410_fops =
2  {
3    owner: THIS_MODULE,
4    open: s3c2410_ts_open, //打开
5    read: s3c2410_ts_read, //读坐标
6    release:
7      s3c2410_ts_release,
8    #ifdef USE_ASYNC
9      fasync: s3c2410_ts_fasync, // fasync()函数
10   #endif
11   poll: s3c2410_ts_poll,//轮询
12 };