串口驱动问题omap-serial.c

有用使用RS485，需要软件使用收发。

 需在驱动架构修改，已经做了一下修改。发现不是很理想。

##########################

1、start_tx 时为TX 模式

2、shutdown时为RX模式

问题：一个发线程和收线程，此时是能发不能收。

求解：收发模式的最好点是在哪里？

#########################

static struct uart_ops serial_omap_pops = {                                                                                                                                                         
        .tx_empty       = serial_omap_tx_empty,
        .set_mctrl      = serial_omap_set_mctrl,
        .get_mctrl      = serial_omap_get_mctrl,
        .stop_tx        = serial_omap_stop_tx,
        .start_tx       = serial_omap_start_tx,
        .stop_rx        = serial_omap_stop_rx,
        .enable_ms      = serial_omap_enable_ms,
        .break_ctl      = serial_omap_break_ctl,
        .startup        = serial_omap_startup,
        .shutdown       = serial_omap_shutdown,
        .set_termios    = serial_omap_set_termios,
        .pm             = serial_omap_pm,
        .type           = serial_omap_type,
        .release_port   = serial_omap_release_port,
        .request_port   = serial_omap_request_port,
        .config_port    = serial_omap_config_port,
        .verify_port    = serial_omap_verify_port,
#ifdef CONFIG_CONSOLE_POLL
        .poll_put_char  = serial_omap_poll_put_char,
        .poll_get_char  = serial_omap_poll_get_char,
#endif
};