LINUX驱动学习——内核USB驱动编写八USB的OTG驱动2（转载）（4） machine, LINUX

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/* Set OTG state machine operations */  /**************************************************************/
  static struct otg_fsm_ops fsl_otg_ops = {
.chrg_vbus = fsl_otg_chrg_vbus,
.drv_vbus = fsl_otg_drv_vbus,
.loc_conn = fsl_otg_loc_conn,
.loc_sof = fsl_otg_loc_sof,
.start_pulse = fsl_otg_start_pulse,
   .add_timer = fsl_otg_add_timer,
.del_timer = fsl_otg_del_timer,
   .start_host = fsl_otg_start_host,
.start_gadget = fsl_otg_start_gadget,
};
  /**************************************************************/
    fsl_otg_tc->fsm.ops = &fsl_otg_ops;
    /* initialize the otg structure */
    fsl_otg_tc->otg.label = DRIVER_DESC;
    fsl_otg_tc->otg.set_host = fsl_otg_set_host;
    fsl_otg_tc->otg.set_peripheral = fsl_otg_set_peripheral;
    fsl_otg_tc->otg.set_power = fsl_otg_set_power;
    fsl_otg_tc->otg.start_hnp = fsl_otg_start_hnp;
    fsl_otg_tc->otg.start_srp = fsl_otg_start_srp;
    fsl_otg_dev = fsl_otg_tc;
    /* Store the otg transceiver */
  /***************************************************************/
  int otg_set_transceiver(struct otg_transceiver *x)
{
if (xceiv && x)
  return -EBUSY;
xceiv = x;
return 0;
}
该函数就是将struct otg_transceiver结构副给一个全局变量保存，供以后使用，以后会通过调用下面函数得到该结构
  struct otg_transceiver *otg_get_transceiver(void)
{
if (xceiv)
  get_device(xceiv->dev);
return xceiv;
}
  /***************************************************************/
    status = otg_set_transceiver(&fsl_otg_tc->otg);
    if (status) {
        printk(KERN_WARNING ": unable to register OTG transceiver.\n");
        return status;
    }
    return 0;
}