/***********************************************************************

 *                     I.MX6 SHT20 Linux 驱动移植

 * 说明：

 *     本来打算使用SHT10来做湿度检测，发现其并不是I2C接口，当然也使用

 * GPIO能获取到相关数据了，不过由于不小心将其烧坏了，所以换成SHT20。

 *

 *                                     2016-10-10 深圳 南山平山村 曾剑锋

 **********************************************************************/

一、参考驱动：

    Android_Native_Service_SHT20Demo

        https://github.com/HowardLin/Android_Native_Service_SHT20Demo/blob/master/SHT20_Module_1.2/sht20_driver/sht20.c#L126

二、驱动修改：

    static s32 sht20_get_id(struct i2c_client *client, u8 serial[])

    {

        s32 result;

        u8 serialA[];

        u8 serialB[];

        u8 command1[] = {0xFA, 0x0F}; /* Read from memory location 1 */

        u8 command2[] = {0xFC, 0xC9}; /* Read from memory location 2 */

        struct i2c_msg get_serial_number_msg1[] = {

            {

                .addr = client->addr,

                .flags = ~I2C_M_RD,

                .len = ,

                .buf = command1,

            },

            {

                .addr = client->addr,

                .flags = I2C_M_RD,

                .len = ,

                .buf = serialA,

            },

        };

        result = i2c_transfer(client->adapter, get_serial_number_msg1, );

        struct i2c_msg get_serial_number_msg2[] = {

            {

                .addr = client->addr,

                .flags = ~I2C_M_RD,

                .len = ,

                .buf = command2,

            },

            {

                .addr = client->addr,

                .flags = I2C_M_RD,

                .len = ,

                .buf = serialB,

            }

        };

        result = i2c_transfer(client->adapter, get_serial_number_msg2, );

        // printk(KERN_INFO "%x %x %x %x %x %x %x %x", serialB[3], serialB[4], serialA[0], serialA[2], serialA[4], serialA[6], serialB[0], serialB[1]);

        serial[] = serialB[];

        serial[] = serialB[];

        serial[] = serialA[];

        serial[] = serialA[];

        serial[] = serialA[];

        serial[] = serialA[];

        serial[] = serialB[];

        serial[] = serialB[];

        return result;

    }