ATSH204A睡眠后唤醒

ATSH204A  带低功耗, 进入sleep模式后,需要唤醒.

(1) 模拟I2C 接口实现唤醒,

void i2c_send_wake_token(void)
{
    I2C_DATA_LOW();
    udelay(80);
    I2C_DATA_HIGH();
}

(2) 系统级 i2c接口实现唤醒

static u32 atsha204_wakeup(struct i2c_client *client, u8 *buf, u32 num)
{
    struct i2c_msg xfer_msg[1];
    uint8_t buffer[4];
    u32 ret = -99;


    __u16 addr0 = client->addr;
    client->addr = 0x00;
    xfer_msg[0].addr = 0x00;
    xfer_msg[0].len = num + 1;
    xfer_msg[0].flags = client->flags & I2C_M_TEN;
    xfer_msg[0].buf = buf;
    ret = i2c_transfer(client->adapter, xfer_msg, 1);
    atsh204_dbg("i2c_send_wake ret is %d\n",ret);
    client->addr = addr0;
    msleep(4);
    ret = i2c_master_recv(client, buffer, 2);
    atsh204_dbg("i2c_receive_bytes ret is %d\n",ret);
    if((buffer[0]==0x04)&&(buffer[1]==0x11))
    {
        atsh204_dbg("wakeup is ok\n");
        msleep(4);
        return ret;
    }
    else
    {
        atsh204_dbg("wakeup is fail\n");
        msleep(4);
        return -1;
    }
}