i2c 裝置註冊簡易架構

已aw9523b 為例

模組初始化，解除安裝入口

module_init(aw9523b_init);

module_exit(aw9523b_exit);

static int __init aw9523b_init(void)

else
}static void __exit aw9523b_exit(void)

static struct i2c_driver aw9523b_driver=,

.probe=aw9523b_driver_probe, //匹配成功後會呼叫probe函式
.id_table=aw9523b_i2c_id, //id匹配
};

static struct i2c_client *new_client; //i2c_master_send 中作為引數使用

static const struct i2c_device_id aw9523b_i2c_id=,{}}; //i2c_driver 用
#ifdef config_of //和dtb匹配時 
static const struct of_device_id aw9523b_of_match=,
{},};#endif

static int aw9523b_driver_probe(struct i2c_client *client, const struct i2c_device_id *id)

int aw9523b_read_byte(unsigned char cmd, unsigned char *returndata)

; char readdata = 0;
int ret = 0;
//mutex_lock(&aw9523b_i2c_access);
new_client->ext_flag =
((new_client->ext_flag) & i2c_mask_flag) | i2c_wr_flag | i2c_direction_flag;
cmd_buf[0] = cmd;
ret = i2c_master_send(new_client, &cmd_buf[0], (1 << 8 | 1));
if (ret < 0) 
readdata = cmd_buf[0];
*returndata = readdata;
new_client->ext_flag = 0;
//mutex_unlock(&aw9523b_i2c_access);
return 1;
}int aw9523b_write_byte(unsigned char cmd, unsigned char writedata)
; int ret = 0;
//mutex_lock(&aw9523b_i2c_access);
write_data[0] = cmd;
write_data[1] = writedata;
new_client->ext_flag = ((new_client->ext_flag) & i2c_mask_flag) | i2c_direction_flag;
ret = i2c_master_send(new_client, write_data, 2);
if (ret < 0) 
new_client->ext_flag = 0;
//mutex_unlock(&aw9523b_i2c_access);
return 1;
}

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