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      LinuxÖÐI2C×ÜÏßµÄÇý¶¯·ÖΪÁ½¸ö²¿·Ö£¬×ÜÏßÇý¶¯£¨BUS£©ºÍÉ豸Çý¶¯£¨DEVICE£©¡£ÆäÖÐ×ÜÏßÇý¶¯µÄÖ°Ôð£¬ÊÇΪϵͳÖÐÿ¸öI2C×ÜÏßÔö¼ÓÏàÓ¦µÄ¶Áд·½·¨£¨±ÈÈ粻ͬµÄÖ÷оƬ¼¯³ÉµÄI2C¿ØÖÆÆ÷£©¡£µ«ÊÇ×ÜÏßÇý¶¯±¾Éí²¢²»»á½øÐÐÈκεÄͨѶ£¬ËüÖ»ÊÇ´æÔÚÔÚÄÇÀµÈ´ýÉ豸Çý¶¯µ÷ÓÃÆäº¯Êý¡£
     É豸Çý¶¯ÔòÊÇÓë¹ÒÔÚI2C×ÜÏßÉϵľßÌåµÄÉ豸ͨѶµÄÇý¶¯¡£Í¨¹ýI2C×ÜÏßÇý¶¯ÌṩµÄº¯Êý£¬É豸Çý¶¯¿ÉÒÔºöÂÔ²»Í¬×ÜÏß¿ØÖÆÆ÷µÄ²îÒ죬²»¿¼ÂÇÆäʵÏÖϸ½ÚµØÓëÓ²¼þÉ豸ͨѶ¡£
2£¬×ÜÏßÇý¶¯
     ÔÚϵͳ¿ª»úʱ£¬Ê×ÏÈ×°ÔØµÄÊÇI2C×ÜÏßÇý¶¯¡£Ò»¸ö×ÜÏßÇý¶¯ÓÃÓÚÖ§³ÖÒ»ÌõÌØ¶¨µÄI2C×ÜÏߵĶÁд¡£Ò»¸ö×ÜÏßÇý¶¯Í¨³£ÐèÒªÁ½¸öÄ£¿é£¬Ò»¸östruct i2c_adapterºÍÒ»¸östruct i2c_algorithmÀ´ÃèÊö£º
 static struct i2c_adapter pb1550_board_adapter =
 {
      name:              "pb1550 adapter",
      id:                I2C_HW_AU1550_PSC,
      algo:              NULL,
      algo_data:         &pb1550_i2c_info,
      inc_use:           pb1550_inc_use,
      dec_use:           pb1550_dec_use,
      client_register:   pb1550_reg,
      client_unregister: pb1550_unreg,
      client_count:      0,
 };
       Õâ¸öÑùÀý¹Ò½ÓÁËÒ»¸ö½Ð×ö“pb1550”µÄadapterÇý¶¯¡£µ«Õâ¸öÄ£¿é²¢Î´Ìṩ¶Áдº¯Êý£¬¾ßÌåµÄ¶Áд·½·¨Óɵڶþ¸öÄ£¿é£¬struct i2c_algorithmÌṩ¡£
 static struct i2c_algorithm au1550_algo =
 {
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