io_edgeport.c

h内核

		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, &stop_char, 1);
		if (status <= 0) {
			return;
		}
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (tty->termios->c_cflag & CRTSCTS) {
		edge_port->shadowMCR &= ~MCR_RTS;
		status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
		if (status != 0) {
			return;
		}
	}

	return;
}


/*****************************************************************************
 * edge_unthrottle
 *	this function is called by the tty driver when it wants to resume the data
 *	being read from the port (called after SerialThrottle is called)
 *****************************************************************************/
static void edge_unthrottle (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	int status;

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

	if (edge_port == NULL)
		return;

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		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, &start_char, 1);
		if (status <= 0) {
			return;
		}
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (tty->termios->c_cflag & CRTSCTS) {
		edge_port->shadowMCR |= MCR_RTS;
		status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
		if (status != 0) {
			return;
		}
	}

	return;
}


/*****************************************************************************
 * SerialSetTermios
 *	this function is called by the tty driver when it wants to change the termios structure
 *****************************************************************************/
static void edge_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	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 &&
		    tty->termios->c_iflag == old_termios->c_iflag) {
			dbg("%s - nothing to change", __FUNCTION__);
			return;
		}
	}

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

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

	if (edge_port == NULL)
		return;

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return;
	}

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

	return;
}


/*****************************************************************************
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 * 	    is emptied.  On bus types like RS485, the transmitter must
 * 	    release the bus after transmitting. This must be done when
 * 	    the transmit shift register is empty, not be done when the
 * 	    transmit holding register is empty.  This functionality
 * 	    allows an RS485 driver to be written in user space. 
 *****************************************************************************/
static int get_lsr_info(struct edgeport_port *edge_port, unsigned int __user *value)
{
	unsigned int result = 0;
	unsigned long flags;

	spin_lock_irqsave(&edge_port->ep_lock, flags);
	if (edge_port->maxTxCredits == edge_port->txCredits &&
	    edge_port->txfifo.count == 0) {
		dbg("%s -- Empty", __FUNCTION__);
		result = TIOCSER_TEMT;
	}
	spin_unlock_irqrestore(&edge_port->ep_lock, flags);

	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	return 0;
}

static int get_number_bytes_avail(struct edgeport_port *edge_port, unsigned int __user *value)
{
	unsigned int result = 0;
	struct tty_struct *tty = edge_port->port->tty;

	if (!tty)
		return -ENOIOCTLCMD;

	result = tty->read_cnt;

	dbg("%s(%d) = %d", __FUNCTION__,  edge_port->port->number, result);
	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	//return 0;
	return -ENOIOCTLCMD;
}

static int edge_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	unsigned int mcr;

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

	mcr = edge_port->shadowMCR;
	if (set & TIOCM_RTS)
		mcr |= MCR_RTS;
	if (set & TIOCM_DTR)
		mcr |= MCR_DTR;
	if (set & TIOCM_LOOP)
		mcr |= MCR_LOOPBACK;

	if (clear & TIOCM_RTS)
		mcr &= ~MCR_RTS;
	if (clear & TIOCM_DTR)
		mcr &= ~MCR_DTR;
	if (clear & TIOCM_LOOP)
		mcr &= ~MCR_LOOPBACK;

	edge_port->shadowMCR = mcr;

	send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);

	return 0;
}

static int edge_tiocmget(struct usb_serial_port *port, struct file *file)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	unsigned int result = 0;
	unsigned int msr;
	unsigned int mcr;

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

	msr = edge_port->shadowMSR;
	mcr = edge_port->shadowMCR;
	result = ((mcr & MCR_DTR)	? TIOCM_DTR: 0)	  /* 0x002 */
		  | ((mcr & MCR_RTS)	? TIOCM_RTS: 0)   /* 0x004 */
		  | ((msr & EDGEPORT_MSR_CTS)	? TIOCM_CTS: 0)   /* 0x020 */
		  | ((msr & EDGEPORT_MSR_CD)	? TIOCM_CAR: 0)   /* 0x040 */
		  | ((msr & EDGEPORT_MSR_RI)	? TIOCM_RI:  0)   /* 0x080 */
		  | ((msr & EDGEPORT_MSR_DSR)	? TIOCM_DSR: 0);  /* 0x100 */


	dbg("%s -- %x", __FUNCTION__, result);

	return result;
}

static int get_serial_info(struct edgeport_port *edge_port, struct serial_struct __user *retinfo)
{
	struct serial_struct tmp;

	if (!retinfo)
		return -EFAULT;

	memset(&tmp, 0, sizeof(tmp));

	tmp.type		= PORT_16550A;
	tmp.line		= edge_port->port->serial->minor;
	tmp.port		= edge_port->port->number;
	tmp.irq			= 0;
	tmp.flags		= ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
	tmp.xmit_fifo_size	= edge_port->maxTxCredits;
	tmp.baud_base		= 9600;
	tmp.close_delay		= 5*HZ;
	tmp.closing_wait	= 30*HZ;
//	tmp.custom_divisor	= state->custom_divisor;
//	tmp.hub6		= state->hub6;
//	tmp.io_type		= state->io_type;

	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;
	return 0;
}



/*****************************************************************************
 * SerialIoctl
 *	this function handles any ioctl calls to the driver
 *****************************************************************************/
static int edge_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct async_icount cnow;
	struct async_icount cprev;
	struct serial_icounter_struct icount;


	dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);

	switch (cmd) {
		// return number of bytes available
		case TIOCINQ:
			dbg("%s (%d) TIOCINQ", __FUNCTION__,  port->number);
			return get_number_bytes_avail(edge_port, (unsigned int __user *) arg);
			break;

		case TIOCSERGETLSR:
			dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
			return get_lsr_info(edge_port, (unsigned int __user *) arg);
			return 0;

		case TIOCGSERIAL:
			dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
			return get_serial_info(edge_port, (struct serial_struct __user *) arg);

		case TIOCSSERIAL:
			dbg("%s (%d) TIOCSSERIAL", __FUNCTION__,  port->number);
			break;

		case TIOCMIWAIT:
			dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
			cprev = edge_port->icount;
			while (1) {
				interruptible_sleep_on(&edge_port->delta_msr_wait);
				/* see if a signal did it */
				if (signal_pending(current))
					return -ERESTARTSYS;
				cnow = edge_port->icount;
				if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
				    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
					return -EIO; /* no change => error */
				if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
				    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
				    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
				    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
					return 0;
				}
				cprev = cnow;
			}
			/* NOTREACHED */
			break;

		case TIOCGICOUNT:
			cnow = edge_port->icount;
			memset(&icount, 0, sizeof(icount));
			icount.cts = cnow.cts;
			icount.dsr = cnow.dsr;
			icount.rng = cnow.rng;
			icount.dcd = cnow.dcd;
			icount.rx = cnow.rx;
			icount.tx = cnow.tx;
			icount.frame = cnow.frame;
			icount.overrun = cnow.overrun;
			icount.parity = cnow.parity;
			icount.brk = cnow.brk;
			icount.buf_overrun = cnow.buf_overrun;

			dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,  port->number, icount.rx, icount.tx );
			if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
				return -EFAULT;
			return 0;
	}

	return -ENOIOCTLCMD;
}


/*****************************************************************************
 * SerialBreak
 *	this function sends a break to the port
 *****************************************************************************/
static void edge_break (struct usb_serial_port *port, int break_state)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	int status;

	/* flush and chase */
	edge_port->chaseResponsePending = TRUE;

	dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
	status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
	if (status == 0) {
		// block until chase finished
		block_until_chase_response(edge_port);
	} else {
		edge_port->chaseResponsePending = FALSE;
	}

	if (break_state == -1) {
		dbg("%s - Sending IOSP_CMD_SET_BREAK", __FUNCTION__);
		status = send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_BREAK, 0);
	} else {
		dbg("%s - Sending IOSP_CMD_CLEAR_BREAK", __FUNCTION__);
		status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CLEAR_BREAK, 0);
	}
	if (status) {
		dbg("%s - error sending break set/clear command.", __FUNCTION__);
	}

	return;
}


/*****************************************************************************
 * process_rcvd_data
 *	this function handles the data received on the bulk in pipe.
 *****************************************************************************/
static void process_rcvd_data (struct edgeport_serial *edge_serial, unsigned char * buffer, __u16 bufferLength)
{
	struct usb_serial_port *port;
	struct edgeport_port *edge_port;
	struct tty_struct *tty;
	__u16 lastBufferLength;
	__u16 rxLen;

	dbg("%s", __FUNCTION__);

	lastBufferLength = bufferLength + 1;

	while (bufferLength > 0) {
		/* failsafe incase we get a message that we don't understand */
		if (lastBufferLength == bu