io_ti.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

	urb->dev = dev;
	status = usb_submit_urb (urb);
	if (status) {
		err ("%s - read bulk usb_submit_urb failed with value %d", __FUNCTION__, status);
		return status;
	}

	++edge_serial->num_ports_open;

	dbg("%s - exited", __FUNCTION__);

	return 0;
}

static void edge_close (struct usb_serial_port *port, struct file * filp)
{
	struct usb_serial *serial;
	struct edgeport_serial *edge_serial;
	struct edgeport_port *edge_port;
	int port_number;
	int status;

	if (port_paranoia_check (port, __FUNCTION__))
		return;
	
	dbg("%s - port %d", __FUNCTION__, port->number);
			 
	serial = get_usb_serial (port, __FUNCTION__);
	if (!serial)
		return;
	
	edge_serial = (struct edgeport_serial *)serial->private;
	edge_port = (struct edgeport_port *)port->private;
	if ((edge_serial == NULL) || (edge_port == NULL))
		return;
	
	if (serial->dev) {
		/* The bulkreadcompletion routine will check 
		 * this flag and dump add read data */
		edge_port->close_pending = 1;

		/* chase the port close */
		TIChasePort (edge_port);

		usb_unlink_urb (port->read_urb);

		/* assuming we can still talk to the device,
		 * send a close port command to it */
		dbg("%s - send umpc_close_port", __FUNCTION__);
		port_number = port->number - port->serial->minor;
		status = TIWriteCommandSync (port->serial->dev,
					     UMPC_CLOSE_PORT,
					     (__u8)(UMPM_UART1_PORT + port_number),
					     0,
					     NULL,
					     0);
		--edge_port->edge_serial->num_ports_open;
		if (edge_port->edge_serial->num_ports_open <= 0) {
			/* last port is now closed, let's shut down our interrupt urb */
			usb_unlink_urb (serial->port[0].interrupt_in_urb);
			edge_port->edge_serial->num_ports_open = 0;
		}
	edge_port->close_pending = 0;
	}

	dbg("%s - exited", __FUNCTION__);
}

static int edge_write (struct usb_serial_port *port, int from_user, const unsigned char *data, int count)
{
	struct usb_serial *serial = port->serial;
	struct edgeport_port *edge_port = port->private;
	int result;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (count == 0) {
		dbg("%s - write request of 0 bytes", __FUNCTION__);
		return 0;
	}

	if (edge_port == NULL)
		return -ENODEV;
	if (edge_port->close_pending == 1)
		return -ENODEV;
	
	if (port->write_urb->status == -EINPROGRESS) {
		dbg ("%s - already writing", __FUNCTION__);
		return 0;
	}

	count = min (count, port->bulk_out_size);

	if (from_user) {
		if (copy_from_user(port->write_urb->transfer_buffer, data, count))
			return -EFAULT;
	} else {
		memcpy (port->write_urb->transfer_buffer, data, count);
	}

	usb_serial_debug_data (__FILE__, __FUNCTION__, count, port->write_urb->transfer_buffer);

	/* set up our urb */
	usb_fill_bulk_urb (port->write_urb, serial->dev,
			   usb_sndbulkpipe (serial->dev,
					    port->bulk_out_endpointAddress),
			   port->write_urb->transfer_buffer, count,
			   edge_bulk_out_callback,
			   port);

	/* send the data out the bulk port */
	result = usb_submit_urb(port->write_urb);
	if (result)
		err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
	else
		result = count;

	if (result > 0)
		edge_port->icount.tx += count;

	return result;
}

static int edge_write_room (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)(port->private);
	int room = 0;

	dbg("%s", __FUNCTION__);

	if (edge_port == NULL)
		return -ENODEV;
	if (edge_port->close_pending == 1)
		return -ENODEV;
	
	dbg("%s - port %d", __FUNCTION__, port->number);

	if (port->write_urb->status != -EINPROGRESS)
		room = port->bulk_out_size;

	dbg("%s - returns %d", __FUNCTION__, room);
	return room;
}

static int edge_chars_in_buffer (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)(port->private);
	int chars = 0;

	dbg("%s", __FUNCTION__);

	if (edge_port == NULL)
		return -ENODEV;
	if (edge_port->close_pending == 1)
		return -ENODEV;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (port->write_urb->status == -EINPROGRESS)
		chars = port->write_urb->transfer_buffer_length;

	dbg ("%s - returns %d", __FUNCTION__, chars);
	return chars;
}

static void edge_throttle (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)(port->private);
	struct tty_struct *tty;
	int status;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (edge_port == NULL)
		return;

	tty = port->tty;
	if (!tty) {
		dbg ("%s - no tty available", __FUNCTION__);
		return;
	}
	/* if we are implementing XON/XOFF, send the stop character */
	if (I_IXOFF(tty)) {
		unsigned char stop_char = STOP_CHAR(tty);
		status = edge_write (port, 0, &stop_char, 1);
		if (status <= 0) {
			return;
		}
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (tty->termios->c_cflag & CRTSCTS) {
		status = TIClearRts (edge_port);
	}

	usb_unlink_urb (port->read_urb);
}

static void edge_unthrottle (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)(port->private);
	struct tty_struct *tty;
	int status;

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (edge_port == NULL)
		return;

	tty = port->tty;
	if (!tty) {
		dbg ("%s - no tty available", __FUNCTION__);
		return;
	}

	/* if we are implementing XON/XOFF, send the start character */
	if (I_IXOFF(tty)) {
		unsigned char start_char = START_CHAR(tty);
		status = edge_write (port, 0, &start_char, 1);
		if (status <= 0) {
			return;
		}
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (tty->termios->c_cflag & CRTSCTS) {
		status = TISetRts (edge_port);
	}

	port->read_urb->dev = port->serial->dev;
	status = usb_submit_urb (port->read_urb);
	if (status) {
		err ("%s - usb_submit_urb failed with value %d", __FUNCTION__, status);
	}
}


static void change_port_settings (struct edgeport_port *edge_port, struct termios *old_termios)
{
	struct ump_uart_config *config;
	struct tty_struct *tty;
	int baud;
	int round;
	unsigned cflag;
	int status;
	int port_number = edge_port->port->number - edge_port->port->serial->minor;

	dbg("%s - port %d", __FUNCTION__, edge_port->port->number);

	tty = edge_port->port->tty;
	if ((!tty) ||
	    (!tty->termios)) {
		dbg("%s - no tty structures", __FUNCTION__);
		return;
	}

	config = kmalloc (sizeof (*config), GFP_KERNEL);
	if (!config) {
		err ("%s - out of memory", __FUNCTION__);
		return;
	}

	cflag = tty->termios->c_cflag;

	config->wFlags = 0;

	/* These flags must be set */
	config->wFlags |= UMP_MASK_UART_FLAGS_RECEIVE_MS_INT;
	config->wFlags |= UMP_MASK_UART_FLAGS_AUTO_START_ON_ERR;
	config->bUartMode = 0;

	switch (cflag & CSIZE) {
		case CS5:
			    config->bDataBits = UMP_UART_CHAR5BITS;
			    dbg ("%s - data bits = 5", __FUNCTION__);
			    break;
		case CS6:
			    config->bDataBits = UMP_UART_CHAR6BITS;
			    dbg ("%s - data bits = 6", __FUNCTION__);
			    break;
		case CS7:
			    config->bDataBits = UMP_UART_CHAR7BITS;
			    dbg ("%s - data bits = 7", __FUNCTION__);
			    break;
		default:
		case CS8:
			    config->bDataBits = UMP_UART_CHAR8BITS;
			    dbg ("%s - data bits = 8", __FUNCTION__);
			    break;
	}

	if (cflag & PARENB) {
		if (cflag & PARODD) {
			config->wFlags |= UMP_MASK_UART_FLAGS_PARITY;
			config->bParity = UMP_UART_ODDPARITY;
			dbg("%s - parity = odd", __FUNCTION__);
		} else {
			config->wFlags |= UMP_MASK_UART_FLAGS_PARITY;
			config->bParity = UMP_UART_EVENPARITY;
			dbg("%s - parity = even", __FUNCTION__);
		}
	} else {
		config->bParity = UMP_UART_NOPARITY; 	
		dbg("%s - parity = none", __FUNCTION__);
	}

	if (cflag & CSTOPB) {
		config->bStopBits = UMP_UART_STOPBIT2;
		dbg("%s - stop bits = 2", __FUNCTION__);
	} else {
		config->bStopBits = UMP_UART_STOPBIT1;
		dbg("%s - stop bits = 1", __FUNCTION__);
	}

	/* figure out the flow control settings */
	if (cflag & CRTSCTS) {
		config->wFlags |= UMP_MASK_UART_FLAGS_OUT_X_CTS_FLOW;
		config->wFlags |= UMP_MASK_UART_FLAGS_RTS_FLOW;
		dbg("%s - RTS/CTS is enabled", __FUNCTION__);
	} else {
		dbg("%s - RTS/CTS is disabled", __FUNCTION__);
	}

	/* if we are implementing XON/XOFF, set the start and stop character in the device */
	if (I_IXOFF(tty) || I_IXON(tty)) {
		config->cXon  = START_CHAR(tty);
		config->cXoff = STOP_CHAR(tty);

		/* if we are implementing INBOUND XON/XOFF */
		if (I_IXOFF(tty)) {
			config->wFlags |= UMP_MASK_UART_FLAGS_IN_X;
			dbg ("%s - INBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x",
			     __FUNCTION__, config->cXon, config->cXoff);
		} else {
			dbg ("%s - INBOUND XON/XOFF is disabled", __FUNCTION__);
		}

		/* if we are implementing OUTBOUND XON/XOFF */
		if (I_IXON(tty)) {
			config->wFlags |= UMP_MASK_UART_FLAGS_OUT_X;
			dbg ("%s - OUTBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x",
			     __FUNCTION__, config->cXon, config->cXoff);
		} else {
			dbg ("%s - OUTBOUND XON/XOFF is disabled", __FUNCTION__);
		}
	}

	/* Round the baud rate */
	baud = tty_get_baud_rate(tty);
	if (!baud) {
		/* pick a default, any default... */
		baud = 9600;
	}
	config->wBaudRate = (__u16)(461550L / baud);
	round = 4615500L / baud;
	if ((round - (config->wBaudRate * 10)) >= 5)
		config->wBaudRate++;

	dbg ("%s - baud rate = %d, wBaudRate = %d", __FUNCTION__, baud, config->wBaudRate);

	dbg ("wBaudRate:   %d", (int)(461550L / config->wBaudRate));
	dbg ("wFlags:    0x%x", config->wFlags);
	dbg ("bDataBits:   %d", config->bDataBits);
	dbg ("bParity:     %d", config->bParity);
	dbg ("bStopBits:   %d", config->bStopBits);
	dbg ("cXon:        %d", config->cXon);
	dbg ("cXoff:       %d", config->cXoff);
	dbg ("bUartMode:   %d", config->bUartMode);

	/* move the word values into big endian mode */
	cpu_to_be16s (&config->wFlags);
	cpu_to_be16s (&config->wBaudRate);

	status = TIWriteCommandSync (edge_port->port->serial->dev,
				UMPC_SET_CONFIG,
				(__u8)(UMPM_UART1_PORT + port_number),
				0,
				(__u8 *)config,
				sizeof(*config));
	if (status) {
		dbg ("%s - error %d when trying to write config to device",
		     __FUNCTION__, status);
	}

	kfree (config);
	
	return;
}

static void edge_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)(port->private);
	struct tty_struct *tty = port->tty;
	unsigned int cflag;

	if (!port->tty || !port->tty->termios) {
		dbg ("%s - no tty or termios", __FUNCTION__);
		return;
	}

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

	dbg("%s - clfag %08x iflag %08x", __FUNCTION__, 
	    tty->termios->c_cflag,
	    RELEVANT_IFLAG(tty->termios->c_iflag));
	if (old_termios) {
		dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
		    old_termios->c_cflag,
		    RELEVANT_IFLAG(old_termios->c_iflag));
	}

	dbg("%s - port %d", __FUNCTION__, port->number);

	if (edge_port == NULL)
		return;

	/* change the port settings to the new ones specified */
	change_port_settings (edge_port, old_termios);

	return;
}

static int set_modem_info (struct edgeport_port *edge_port, unsigned int cmd, unsigned int *value)
{
	unsigned int mcr = edge_port->shadow_mcr;
	unsigned int arg;

	if (copy_from_user(&arg, value, sizeof(int)))
		return -EFAULT;

	switch (cmd) {
		case TIOCMBIS:
			if (arg & TIOCM_RTS)
				mcr |= MCR_RTS;
			if (arg & TIOCM_DTR)
				mcr |= MCR_RTS;
			if (arg & TIOCM_LOOP)
				mcr |= MCR_LOOPBACK;
			break;

		case TIOCMBIC:
			if (arg & TIOCM_RTS)
				mcr &= ~MCR_RTS;
			if (arg & TIOCM_DTR)
				mcr &= ~MCR_RTS;
			if (arg & TIOCM_LOOP)
				mcr &= ~MCR_LOOPBACK;
			break;

		case TIOCMSET:
			/* turn off the RTS and DTR and LOOPBACK 
			 * and then only turn on what was asked to */
			mcr &=  ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
			mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
			mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
			mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
			break;
	}

	edge_port->shadow_mcr = mcr;

	TIRestoreMCR (edge_port, mcr);

	return 0;
}

static int get_modem_info (struct edgeport_port *edge_port, unsigned int *value)
{
	unsigned int result = 0;
	unsigned int msr = edge_port->shadow_msr;
	unsigned int mcr = edge_port->shadow_mcr;

	result = ((mcr & MCR_DTR)	? TIOCM_DTR: 0)	  /* 0x002 */
		  | ((m