belkin_sa.c

ep9315平台下USB驱动的源码

	if (priv->last_msr & BELKIN_SA_MSR_CTS)
		priv->control_state |= TIOCM_CTS;
	else
		priv->control_state &= ~TIOCM_CTS;

	if (priv->last_msr & BELKIN_SA_MSR_RI)
		priv->control_state |= TIOCM_RI;
	else
		priv->control_state &= ~TIOCM_RI;

	if (priv->last_msr & BELKIN_SA_MSR_CD)
		priv->control_state |= TIOCM_CD;
	else
		priv->control_state &= ~TIOCM_CD;

	/* Now to report any errors */
	priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
#if 0
	/*
	 * fill in the flip buffer here, but I do not know the relation
	 * to the current/next receive buffer or characters.  I need
	 * to look in to this before committing any code.
	 */
	if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
		tty = port->tty;
		/* Overrun Error */
		if (priv->last_lsr & BELKIN_SA_LSR_OE) {
		}
		/* Parity Error */
		if (priv->last_lsr & BELKIN_SA_LSR_PE) {
		}
		/* Framing Error */
		if (priv->last_lsr & BELKIN_SA_LSR_FE) {
		}
		/* Break Indicator */
		if (priv->last_lsr & BELKIN_SA_LSR_BI) {
		}
	}
#endif

	/* INT urbs are automatically re-submitted */
}

static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	struct usb_serial *serial = port->serial;
	struct belkin_sa_private *priv = (struct belkin_sa_private *)port->private;
	unsigned int iflag;
	unsigned int cflag;
	unsigned int old_iflag = 0;
	unsigned int old_cflag = 0;
	__u16 urb_value = 0; /* Will hold the new flags */
	
	if ((!port->tty) || (!port->tty->termios)) {
		dbg ("%s - no tty or termios structure", __FUNCTION__);
		return;
	}

	iflag = port->tty->termios->c_iflag;
	cflag = port->tty->termios->c_cflag;

	/* check that they really want us to change something */
	if (old_termios) {
		if ((cflag == old_termios->c_cflag) &&
		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
			dbg("%s - nothing to change...", __FUNCTION__);
			return;
		}
		old_iflag = old_termios->c_iflag;
		old_cflag = old_termios->c_cflag;
	}

	/* Set the baud rate */
	if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
		/* reassert DTR and (maybe) RTS on transition from B0 */
		if( (old_cflag&CBAUD) == B0 ) {
			priv->control_state |= (TIOCM_DTR|TIOCM_RTS);
			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
				err("Set DTR error");
			/* don't set RTS if using hardware flow control */
			if (!(old_cflag&CRTSCTS) )
				if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
					err("Set RTS error");
		}

		switch(cflag & CBAUD) {
			case B0: /* handled below */ break;
			case B300: urb_value = BELKIN_SA_BAUD(300); break;
			case B600: urb_value = BELKIN_SA_BAUD(600); break;
			case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
			case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
			case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
			case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
			case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
			case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
			case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
			case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
			case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
			default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
				urb_value = BELKIN_SA_BAUD(9600); break;
		}
		if ((cflag & CBAUD) != B0 ) {
			if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
				err("Set baudrate error");
		} else {
			/* Disable flow control */
			if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
				err("Disable flowcontrol error");

			/* Drop RTS and DTR */
			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
				err("DTR LOW error");
			if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
				err("RTS LOW error");
		}
	}

	/* set the parity */
	if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
		if (cflag & PARENB)
			urb_value = (cflag & PARODD) ?  BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
		else
			urb_value = BELKIN_SA_PARITY_NONE;
		if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
			err("Set parity error");
	}

	/* set the number of data bits */
	if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
		switch (cflag & CSIZE) {
			case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
			case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
			case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
			case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
			default: err("CSIZE was not CS5-CS8, using default of 8");
				urb_value = BELKIN_SA_DATA_BITS(8);
				break;
		}
		if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
			err("Set data bits error");
	}

	/* set the number of stop bits */
	if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
		urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
		if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
			err("Set stop bits error");
	}

	/* Set flow control */
	if( (iflag&IXOFF)   != (old_iflag&IXOFF)
	||	(iflag&IXON)    != (old_iflag&IXON)
	||  (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
		urb_value = 0;
		if ((iflag & IXOFF) || (iflag & IXON))
			urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
		else
			urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);

		if (cflag & CRTSCTS)
			urb_value |=  (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
		else
			urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);

		if (priv->bad_flow_control)
			urb_value &= ~(BELKIN_SA_FLOW_IRTS);

		if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
			err("Set flow control error");
	}
} /* belkin_sa_set_termios */


static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
{
	struct usb_serial *serial = port->serial;

	if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
		err("Set break_ctl %d", break_state);
}


static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
	struct usb_serial *serial = port->serial;
	__u16 urb_value; /* Will hold the new flags */
	struct belkin_sa_private *priv = (struct belkin_sa_private *)port->private;
	int  ret, mask;
	
	/* Based on code from acm.c and others */
	switch (cmd) {
	case TIOCMGET:
		return put_user(priv->control_state, (unsigned long *) arg);
		break;

	case TIOCMSET: /* Turns on and off the lines as specified by the mask */
	case TIOCMBIS: /* turns on (Sets) the lines as specified by the mask */
	case TIOCMBIC: /* turns off (Clears) the lines as specified by the mask */
		if (get_user(mask, (unsigned long *) arg))
			return -EFAULT;

		if ((cmd == TIOCMSET) || (mask & TIOCM_RTS)) {
			/* RTS needs set */
			urb_value = ((cmd == TIOCMSET) && (mask & TIOCM_RTS)) || (cmd == TIOCMBIS) ? 1 : 0;
			if (urb_value)
				priv->control_state |= TIOCM_RTS;
			else
				priv->control_state &= ~TIOCM_RTS;

			if ((ret = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, urb_value)) < 0) {
				err("Set RTS error %d", ret);
				return(ret);
			}
		}

		if ((cmd == TIOCMSET) || (mask & TIOCM_DTR)) {
			/* DTR needs set */
			urb_value = ((cmd == TIOCMSET) && (mask & TIOCM_DTR)) || (cmd == TIOCMBIS) ? 1 : 0;
			if (urb_value)
				priv->control_state |= TIOCM_DTR;
			else
				priv->control_state &= ~TIOCM_DTR;
			if ((ret = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, urb_value)) < 0) {
				err("Set DTR error %d", ret);
				return(ret);
			}
		}
		break;
					
	case TIOCMIWAIT:
		/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
		/* TODO */
		return( 0 );

	case TIOCGICOUNT:
		/* return count of modemline transitions */
		/* TODO */
		return 0;

	default:
		dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
		return(-ENOIOCTLCMD);
		break;
	}
	return 0;
} /* belkin_sa_ioctl */


static int __init belkin_sa_init (void)
{
	usb_serial_register (&belkin_device);
	info(DRIVER_DESC " " DRIVER_VERSION);
	return 0;
}


static void __exit belkin_sa_exit (void)
{
	usb_serial_deregister (&belkin_device);
}


module_init (belkin_sa_init);
module_exit (belkin_sa_exit);

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

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