TCA8424问题

TCA8424上电后，中断引脚一直是低电平，按照手册应该是要先复位。但是我写reset命令后发现仍然是低电平，不知道是不是我写16位寄存器的方法有问题：

u8 au8Buf[3] = {0};

au8Buf[0] = reg >> 8;
au8Buf[1] = reg & 0xff;
au8Buf[2] = val;

if (i2c_master_send(keypad_data->client, au8Buf, 3) < 0) {
pr_err("%s:write reg error:reg=%x,val=%x\n",
__func__, reg, val);
return -1;
}

另外我发现HID descriptor和Report Descriptor的寄存器，可以读，但是写不进去，这些都是只读的吗？

中断引脚INT有没有通过上拉电阻到Vcc？ 

有，10K电阻拉到3.2V

我按照    slave  ACK   reg高八位  reg 低八位   数据  这样写i2c总是不能复位成功。

[  309.034732] i2c i2c-2: master_xfer[0] W, addr=0x3b, len=3
[  309.044593] i2c i2c-2: <i2c_imx_xfer>
[  309.048306] i2c i2c-2: <i2c_imx_start>
[  309.052137] i2c i2c-2: <i2c_imx_bus_busy>
[  309.056161] i2c i2c-2: <i2c_imx_xfer> transfer message: 0
[  309.061580] i2c i2c-2: <i2c_imx_xfer> CONTROL: IEN=1, IIEN=1, MSTA=1, MTX=1, TXAK=1, RSTA=0
[  309.069948] i2c i2c-2: <i2c_imx_xfer> STATUS: ICF=1, IAAS=0, IBB=1, IAL=0, SRW=0, IIF=0, RXAK=1
[  309.078659] i2c i2c-2: <i2c_imx_write> write slave address: addr=0x76
[  309.085381] i2c i2c-2: <i2c_imx_trx_complete> TRX complete
[  309.090878] i2c i2c-2: <i2c_imx_acked> ACK received
[  309.095765] i2c i2c-2: <i2c_imx_write> write data
[  309.100478] i2c i2c-2: <i2c_imx_write> write byte: B0=0x6
[  309.106147] i2c i2c-2: <i2c_imx_trx_complete> TRX complete
[  309.111642] i2c i2c-2: <i2c_imx_acked> ACK received
[  309.116529] i2c i2c-2: <i2c_imx_write> write byte: B1=0x0
[  309.122195] i2c i2c-2: <i2c_imx_trx_complete> TRX complete
[  309.127690] i2c i2c-2: <i2c_imx_acked> ACK received
[  309.132576] i2c i2c-2: <i2c_imx_write> write byte: B2=0x1
[  309.138243] i2c i2c-2: <i2c_imx_trx_complete> TRX complete
[  309.143738] i2c i2c-2: <i2c_imx_acked> ACK received
[  309.148624] i2c i2c-2: <i2c_imx_stop>
[  309.152293] i2c i2c-2: <i2c_imx_bus_busy>
[  309.156312] i2c i2c-2: <i2c_imx_xfer> exit with: success msg: 1

请问这里我到底应该怎么读写i2c呢？