ftdi_sio.c

基于S3CEB2410平台LINUX操作系统下 USB驱动源代码

		case B19200: urb_value = ftdi_sio_b19200; dbg("Set to 19200") ; break;
		case B38400: urb_value = ftdi_sio_b38400; dbg("Set to 38400") ; break;
		case B57600: urb_value = ftdi_sio_b57600; dbg("Set to 57600") ; break;
		case B115200: urb_value = ftdi_sio_b115200; dbg("Set to 115200") ; break;
		default: dbg(__FUNCTION__ " FTDI_SIO does not support the baudrate (%d) requested",
			     (cflag & CBAUD)); 
		   break;
		}
	} else { /* it is 8U232AM */
		switch(cflag & CBAUD){
		case B0: break; /* ignored by this */
		case B300: urb_value = ftdi_8U232AM_48MHz_b300; dbg("Set to 300"); break;
		case B600: urb_value = ftdi_8U232AM_48MHz_b600; dbg("Set to 600") ; break;
		case B1200: urb_value = ftdi_8U232AM_48MHz_b1200; dbg("Set to 1200") ; break;
		case B2400: urb_value = ftdi_8U232AM_48MHz_b2400; dbg("Set to 2400") ; break;
		case B4800: urb_value = ftdi_8U232AM_48MHz_b4800; dbg("Set to 4800") ; break;
		case B9600: urb_value = ftdi_8U232AM_48MHz_b9600; dbg("Set to 9600") ; break;
		case B19200: urb_value = ftdi_8U232AM_48MHz_b19200; dbg("Set to 19200") ; break;
		case B38400: urb_value = ftdi_8U232AM_48MHz_b38400; dbg("Set to 38400") ; break;
		case B57600: urb_value = ftdi_8U232AM_48MHz_b57600; dbg("Set to 57600") ; break;
		case B115200: urb_value = ftdi_8U232AM_48MHz_b115200; dbg("Set to 115200") ; break;
		case B230400: urb_value = ftdi_8U232AM_48MHz_b230400; dbg("Set to 230400") ; break;
		case B460800: urb_value = ftdi_8U232AM_48MHz_b460800; dbg("Set to 460800") ; break;
		case B921600: urb_value = ftdi_8U232AM_48MHz_b921600; dbg("Set to 921600") ; break;
		default: dbg(__FUNCTION__ " The baudrate (%d) requested is not implemented",
			     (cflag & CBAUD)); 
		   break;
		}
	}
	return(urb_value);
}

static void ftdi_sio_break_ctl( struct usb_serial_port *port, int break_state )
{
	struct usb_serial *serial = port->serial;
	struct ftdi_private *priv = (struct ftdi_private *)port->private;
	__u16 urb_value = 0; 
	char buf[1];
	
	/* break_state = -1 to turn on break, and 0 to turn off break */
	/* see drivers/char/tty_io.c to see it used */
	/* last_set_data_urb_value NEVER has the break bit set in it */

	if (break_state) {
		urb_value = priv->last_set_data_urb_value | FTDI_SIO_SET_BREAK;
	} else {
		urb_value = priv->last_set_data_urb_value; 
	}

	
	if (usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			    FTDI_SIO_SET_DATA_REQUEST, 
			    FTDI_SIO_SET_DATA_REQUEST_TYPE,
			    urb_value , 0,
			    buf, 0, WDR_TIMEOUT) < 0) {
		err(__FUNCTION__ " FAILED to enable/disable break state (state was %d)",break_state);
	}	   

	dbg(__FUNCTION__ " break state is %d - urb is %d",break_state, urb_value);
	
}



/* As I understand this - old_termios contains the original termios settings */
/*  and tty->termios contains the new setting to be used */
/* */
/*   WARNING: set_termios calls this with old_termios in kernel space */

static void ftdi_sio_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{ /* ftdi_sio_set_termios */
	struct usb_serial *serial = port->serial;
	unsigned int cflag = port->tty->termios->c_cflag;
	struct ftdi_private *priv = (struct ftdi_private *)port->private;	
	__u16 urb_value; /* will hold the new flags */
	char buf[1]; /* Perhaps I should dynamically alloc this? */
	
	
	dbg(__FUNCTION__);


	/* FIXME -For this cut I don't care if the line is really changing or 
	   not  - so just do the change regardless  - should be able to 
	   compare old_termios and tty->termios */
	/* NOTE These routines can get interrupted by 
	   ftdi_sio_read_bulk_callback  - need to examine what this 
           means - don't see any problems yet */
	
	/* Set number of data bits, parity, stop bits */
	
	urb_value = 0;
	urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
		      FTDI_SIO_SET_DATA_STOP_BITS_1);
	urb_value |= (cflag & PARENB ? 
		      (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD : 
		       FTDI_SIO_SET_DATA_PARITY_EVEN) :
		      FTDI_SIO_SET_DATA_PARITY_NONE);
	if (cflag & CSIZE) {
		switch (cflag & CSIZE) {
		case CS5: urb_value |= 5; dbg("Setting CS5"); break;
		case CS6: urb_value |= 6; dbg("Setting CS6"); break;
		case CS7: urb_value |= 7; dbg("Setting CS7"); break;
		case CS8: urb_value |= 8; dbg("Setting CS8"); break;
		default:
			err("CSIZE was set but not CS5-CS8");
		}
	}

	/* This is needed by the break command since it uses the same command - but is
	 *  or'ed with this value  */
	priv->last_set_data_urb_value = urb_value;
	
	if (usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			    FTDI_SIO_SET_DATA_REQUEST, 
			    FTDI_SIO_SET_DATA_REQUEST_TYPE,
			    urb_value , 0,
			    buf, 0, 100) < 0) {
		err(__FUNCTION__ " FAILED to set databits/stopbits/parity");
	}	   

	/* Now do the baudrate */
	urb_value = translate_baudrate_to_ftdi((cflag & CBAUD), priv->ftdi_type);
	
	if ((cflag & CBAUD) == B0 ) {
		/* Disable flow control */
		if (usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST, 
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
				    0, 0, 
				    buf, 0, WDR_TIMEOUT) < 0) {
			err(__FUNCTION__ " error from disable flowcontrol urb");
		}	    
		/* Drop RTS and DTR */
		if (set_dtr(serial->dev, usb_sndctrlpipe(serial->dev, 0),LOW) < 0){
			err(__FUNCTION__ " Error from DTR LOW urb");
		}
		if (set_rts(serial->dev, usb_sndctrlpipe(serial->dev, 0),LOW) < 0){
			err(__FUNCTION__ " Error from RTS LOW urb");
		}	
		
	} else {
		/* set the baudrate determined before */
		if (usb_control_msg(serial->dev, 
				    usb_sndctrlpipe(serial->dev, 0),
				    FTDI_SIO_SET_BAUDRATE_REQUEST, 
				    FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE,
				    urb_value, 0, 
				    buf, 0, 100) < 0) {
			err(__FUNCTION__ " urb failed to set baurdrate");
		}
	}
	/* Set flow control */
	/* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
	if (cflag & CRTSCTS) {
		dbg(__FUNCTION__ " Setting to CRTSCTS flow control");
		if (usb_control_msg(serial->dev, 
				    usb_sndctrlpipe(serial->dev, 0),
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST, 
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
				    0 , FTDI_SIO_RTS_CTS_HS,
				    buf, 0, WDR_TIMEOUT) < 0) {
			err("urb failed to set to rts/cts flow control");
		}		
		
	} else { 
		/* CHECKME Assuming XON/XOFF handled by tty stack - not by device */
		dbg(__FUNCTION__ " Turning off hardware flow control");
		if (usb_control_msg(serial->dev, 
				    usb_sndctrlpipe(serial->dev, 0),
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST, 
				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
				    0, 0, 
				    buf, 0, WDR_TIMEOUT) < 0) {
			err("urb failed to clear flow control");
		}				
		
	}
	return;
} /* ftdi_sio_set_termios */

static int ftdi_sio_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
	struct usb_serial *serial = port->serial;
	struct ftdi_private *priv = (struct ftdi_private *)port->private;
	__u16 urb_value=0; /* Will hold the new flags */
	char buf[2];
	int  ret, mask;
	
	dbg(__FUNCTION__ " cmd 0x%04x", cmd);

	/* Based on code from acm.c and others */
	switch (cmd) {

	case TIOCMGET:
		dbg(__FUNCTION__ " TIOCMGET");
		if (priv->ftdi_type == sio){
			/* Request the status from the device */
			if ((ret = usb_control_msg(serial->dev, 
						   usb_rcvctrlpipe(serial->dev, 0),
						   FTDI_SIO_GET_MODEM_STATUS_REQUEST, 
						   FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
						   0, 0, 
						   buf, 1, WDR_TIMEOUT)) < 0 ) {
				err(__FUNCTION__ " Could not get modem status of device - err: %d",
				    ret);
				return(ret);
			}
		} else {
			/* the 8U232AM returns a two byte value (the sio is a 1 byte value) - in the same 
			   format as the data returned from the in point */
			if ((ret = usb_control_msg(serial->dev, 
						   usb_rcvctrlpipe(serial->dev, 0),
						   FTDI_SIO_GET_MODEM_STATUS_REQUEST, 
						   FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
						   0, 0, 
						   buf, 2, WDR_TIMEOUT)) < 0 ) {
				err(__FUNCTION__ " Could not get modem status of device - err: %d",
				    ret);
				return(ret);
			}
		}

		return put_user((buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
				(buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
				(buf[0]  & FTDI_SIO_RI_MASK  ? TIOCM_RI  : 0) |
				(buf[0]  & FTDI_SIO_RLSD_MASK ? TIOCM_CD  : 0),
				(unsigned long *) arg);
		break;

	case TIOCMSET: /* Turns on and off the lines as specified by the mask */
		dbg(__FUNCTION__ " TIOCMSET");
		if (get_user(mask, (unsigned long *) arg))
			return -EFAULT;
		urb_value = ((mask & TIOCM_DTR) ? HIGH : LOW);
		if (set_dtr(serial->dev, usb_sndctrlpipe(serial->dev, 0),urb_value) < 0){
			err("Error from DTR set urb (TIOCMSET)");
		}
		urb_value = ((mask & TIOCM_RTS) ? HIGH : LOW);
		if (set_rts(serial->dev, usb_sndctrlpipe(serial->dev, 0),urb_value) < 0){
			err("Error from RTS set urb (TIOCMSET)");
		}	
		break;
					
	case TIOCMBIS: /* turns on (Sets) the lines as specified by the mask */
		dbg(__FUNCTION__ " TIOCMBIS");
 	        if (get_user(mask, (unsigned long *) arg))
			return -EFAULT;
  	        if (mask & TIOCM_DTR){
			if ((ret = set_dtr(serial->dev, 
					   usb_sndctrlpipe(serial->dev, 0),
					   HIGH)) < 0) {
				err("Urb to set DTR failed");
				return(ret);
			}
		}
		if (mask & TIOCM_RTS) {
			if ((ret = set_rts(serial->dev, 
					   usb_sndctrlpipe(serial->dev, 0),
					   HIGH)) < 0){
				err("Urb to set RTS failed");
				return(ret);
			}
		}
					break;

	case TIOCMBIC: /* turns off (Clears) the lines as specified by the mask */
		dbg(__FUNCTION__ " TIOCMBIC");
 	        if (get_user(mask, (unsigned long *) arg))
			return -EFAULT;
  	        if (mask & TIOCM_DTR){
			if ((ret = set_dtr(serial->dev, 
					   usb_sndctrlpipe(serial->dev, 0),
					   LOW)) < 0){
				err("Urb to unset DTR failed");
				return(ret);
			}
		}	
		if (mask & TIOCM_RTS) {
			if ((ret = set_rts(serial->dev, 
					   usb_sndctrlpipe(serial->dev, 0),
					   LOW)) < 0){
				err("Urb to unset RTS failed");
				return(ret);
			}
		}
		break;

		/*
		 * I had originally implemented TCSET{A,S}{,F,W} and
		 * TCGET{A,S} here separately, however when testing I
		 * found that the higher layers actually do the termios
		 * conversions themselves and pass the call onto
		 * ftdi_sio_set_termios. 
		 *
		 */

	default:
	  /* This is not an error - turns out the higher layers will do 
	   *  some ioctls itself (see comment above)
 	   */
		dbg(__FUNCTION__ " arg not supported - it was 0x%04x",cmd);
		return(-ENOIOCTLCMD);
		break;
	}
	return 0;
} /* ftdi_sio_ioctl */


static int __init ftdi_sio_init (void)
{
	dbg(__FUNCTION__);
	usb_serial_register (&ftdi_sio_device);
	usb_serial_register (&ftdi_8U232AM_device);
	info(DRIVER_VERSION ":" DRIVER_DESC);
	return 0;
}


static void __exit ftdi_sio_exit (void)
{
	dbg(__FUNCTION__);
	usb_serial_deregister (&ftdi_sio_device);
	usb_serial_deregister (&ftdi_8U232AM_device);
}


module_init(ftdi_sio_init);
module_exit(ftdi_sio_exit);

MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");

MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");