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static struct i2c_driver pca953x_driver = { ¡ñ ×¢²ái2c_driver
static int __init pca953x_init(void) ¡ñ attach_adapter¶¯×÷ Ö´ÐÐi2c_add_driver(&pca953x_driver)ºó»á£¬Èç¹ûÄÚºËÖÐÒѾע²áÁËi2cÊÊÅäÆ÷£¬Ôò˳Ðòµ÷ÓÃÕâЩÊÊÅäÆ÷À´Á¬½ÓÎÒÃǵÄi2cÉ豸¡£´Ë¹ý³ÌÊÇͨ¹ýµ÷ÓÃi2c_driverÖеÄattach_adapter·½·¨Íê³ÉµÄ¡£¾ßÌåʵÏÖÐÎʽÈçÏ£º
static int pca953x_attach_adapter(struct i2c_adapter *adapter)
µØÖ·ÐÅÏ¢addr_dataÊÇÓÉÏÂÃæ´úÂëÖ¸¶¨µÄ¡£ ×¢Ò⣺normal_i2cÀïµÄµØÖ·±ØÐëÊÇÄãi2cоƬµÄµØÖ·¡£·ñÔò½«ÎÞ·¨Õýȷ̽²âµ½É豸¡£¶øI2C_ CLIENT_INSMODÊÇÒ»¸öºê£¬Ëü»áÀûÓÃnormal_i2c¹¹½¨addr_data¡£ ¡ñ ¹¹½¨i2c_client£¬²¢×¢²á×Ö·ûÉ豸Çý¶¯ i2c_probeÔÚ̽²âµ½Ä¿±êÉ豸ºó£¬ºóµ÷ÓÃpca953x_detect£¬²¢°Ñµ±Ê±µÄ̽²âµØÖ·address×÷Ϊ²ÎÊý´«Èë¡£
static int pca953x_detect(struct i2c_adapter *adapter, int address, int kind) i2c_check_functionalityÓÃÀ´Åж¨ÉèÅäÆ÷µÄÄÜÁ¦£¬ÕâÒ»µã·Ç³£ÖØÒª¡£ÄãÒ²¿ÉÒÔÖ±½Ó²é¿´¶ÔÓ¦ÉèÅäÆ÷µÄÄÜÁ¦£¬Èç
static const struct i2c_algorithm smbus_algorithm = { ¡ñ ×Ö·ûÇý¶¯µÄ¾ßÌåʵÏÖ
struct file_operations pca953x_fops = { ×Ö·ûÉ豸Çý¶¯±¾ÉíûÓÐʲôºÃ˵µÄ£¬ÕâÀïÖ÷ÒªÏë˵һÏ£¬ÈçºÎÔÚÇý¶¯Öе÷ÓÃi2cÉèÅäÆ÷°ïÎÒÃÇÍê³ÉÊý¾Ý´«Êä¡£ ĿǰÉèÅäÆ÷Ö÷ÒªÖ§³ÖÁ½ÖÖ´«Êä·½·¨£ºsmbus_xferºÍmaster_xfer¡£Ò»°ãÀ´Ëµ£¬Èç¹ûÉèÅäÆ÷Ö§³ÖÁËmaster_xferÄÇôËüÒ²¿ÉÒÔÄ£ÄâÖ§³ÖsmbusµÄ´«Êä¡£µ«Èç¹ûֻʵÏÖsmbus_xfer£¬Ôò²»Ö§³ÖһЩi2cµÄ´«Êä¡£
int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs,int num); master_xferÖеIJÎÊýÉèÖ㬺ÍÇ°ÃæµÄÓû§¿Õ¼ä±à³ÌÒ»Ö¡£ÏÖÔÚÖ»ÊÇÒªÔÚÇý¶¯Öй¹½¨Ïà¹ØµÄ²ÎÊýÈ»ºóµ÷ÓÃi2c_transferÀ´Íê³É´«Êä¼È¿É¡£ int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) smbus_xferÖеIJÎÊýÉèÖü°µ÷Ó÷½·¨ÈçÏ£º
static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val) ÉÏÃæº¯ÊýÍê³ÉÏòоƬµÄµØÖ·ÎªregµÄ¼Ä´æÆ÷дһ¸ö16bitµÄÊý¾Ý¡£i2c_smbus_write_word_dataµÄʵÏÖÈçÏ£º
s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value) ´ÓÖпÉÒÔ¿´³ösmbus´«ÊäÒ»¸ö16λÊý¾ÝµÄ·½·¨¡£ÆäËü²Ù×÷È磺×Ö·ûд¡¢×Ö·û¶Á¡¢×Ö¶Á¡¢¿é²Ù×÷µÈ£¬¿ÉÒԲο¼Äں˵Äi2c-core.cÖÐÌṩµÄ·½·¨¡£ ¡ñ ×¢Ïúi2c_driver
static void __exit pca953x_exit(void) ¡ñ detach_client¶¯×÷ ˳Ðòµ÷ÓÃÄÚºËÖÐ×¢²áµÄÊÊÅäÆ÷À´¶Ï¿ªÎÒÃÇ×¢²á¹ýµÄi2cÉ豸¡£´Ë¹ý³Ìͨ¹ýµ÷ÓÃi2c_driverÖеÄattach_adapter·½·¨Íê³ÉµÄ¡£¾ßÌåʵÏÖÐÎʽÈçÏ£º
static int pca953x_detach_client(struct i2c_client *client) £¨2£© Probe·½Ê½£¨new style£© ¡ñ ¹¹½¨i2c_driver ºÍLEGACY·½Ê½Ò»Ñù£¬Ò²ÐèÒª¹¹½¨i2c_driver£¬µ«ÊÇÄÚÈÝÓÐËù²»Í¬¡£
static struct i2c_driver pca953x_driver = { ¡ñ ×¢²ái2c_driver
static int __init pca953x_init(void) ÔÚ×¢²ái2c_driverµÄ¹ý³ÌÖУ¬Êǽ«driver×¢²áµ½ÁËi2c_bus_typeµÄ×ÜÏßÉÏ¡£´Ë×ÜÏߵį¥Å乿ÔòÊÇ£º
static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, ¿ÉÒÔ¿´³öÊÇÀûÓÃi2c_clientµÄÃû³ÆºÍid_tableÖеÄÃû³Æ×öÆ¥ÅäµÄ¡£±¾Çý¶¯ÖеÄid_tableΪ
static const struct i2c_device_id pca953x_id[] = { ¿´µ½ÏÖÔÚÎÒÃÇÓ¦¸Ã»áÓÐÕâÑùµÄÒÉÎÊ£¬ÔÚAdapterģʽÖУ¬i2c_clientÊÇÎÒÃÇ×Ô¼º¹¹Ôì³öÀ´µÄ£¬¶øÏÖÔÚµÄi2c_clientÊÇ´ÓÄÄÀ´µÄÄØ£¿¿´¿´ÏÂÃæµÄ½âÊÍ ¡ñ ×¢²ái2c_board_info ¶ÔÓÚProbeģʽ£¬Í¨³£ÔÚÆ½Ì¨´úÂëÖÐÒªÍê³Éi2c_board_infoµÄ×¢²á¡£·½·¨ÈçÏ£º
static struct i2c_board_info __initdata test_i2c_devices[] = { i2c_client¾ÍÊÇÔÚ×¢²á¹ý³ÌÖй¹½¨µÄ¡£µ«ÓÐÒ»µãÐèҪעÒâµÄÊÇi2c_register_board_info²¢Ã»ÓÐEXPORT_SYMBOL¸øÄ£¿éʹÓᣠ¡ñ ×Ö·ûÇý¶¯×¢²á ÔÚProbe·½Ê½Ï£¬Ìí¼Ó×Ö·ûÇý¶¯µÄλÖÃÔÚpca953x_probeÖС£
static int __devinit pca953x_probe(struct i2c_client *client,const struct i2c_device_id *id) ¡ñ ×¢Ïúi2c_driver
static void __exit pca953x_exit(void) ¡ñ ×¢Ïú×Ö·ûÉ豸Çý¶¯ ÔÚProbe·½Ê½Ï£¬×¢Ïú×Ö·ûÇý¶¯µÄλÖÃÔÚpca953x_removeÖС£
static int __devinit pca953x_remove (struct i2c_client *client) ¡ñ I2CÉ豸µÄÊý¾Ý½»»¥·½·¨(¼´£ºµ÷ÓÃÊÊÅäÆ÷²Ù×÷É豸µÄ·½·¨)ºÍAdapter·½Ê½ÏÂÏàͬ¡£ Ïà¹Ø×ÊѶ
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