Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1034 insertions, 0 deletions

diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
new file mode 100644
index 0000000..49c602a0
--- /dev/null
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -0,0 +1,1034 @@
+/*
+ * KLSI KL5KUSB105 chip RS232 converter driver
+ *
+ *   Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ * All information about the device was acquired using SniffUSB ans snoopUSB
+ * on Windows98.
+ * It was written out of frustration with the PalmConnect USB Serial adapter
+ * sold by Palm Inc.
+ * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
+ * information that was not already available.
+ *
+ * It seems that KLSI bought some silicon-design information from ScanLogic, 
+ * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
+ * KLSI has firmware available for their devices; it is probable that the
+ * firmware differs from that used by KLSI in their products. If you have an
+ * original KLSI device and can provide some information on it, I would be 
+ * most interested in adding support for it here. If you have any information 
+ * on the protocol used (or find errors in my reverse-engineered stuff), please
+ * let me know.
+ *
+ * The code was only tested with a PalmConnect USB adapter; if you
+ * are adventurous, try it with any KLSI-based device and let me know how it
+ * breaks so that I can fix it!
+ */
+
+/* TODO:
+ *	check modem line signals
+ *	implement handshaking or decide that we do not support it
+ */
+
+/* History:
+ *   0.3a - implemented pools of write URBs
+ *   0.3  - alpha version for public testing
+ *   0.2  - TIOCMGET works, so autopilot(1) can be used!
+ *   0.1  - can be used to to pilot-xfer -p /dev/ttyUSB0 -l
+ *
+ *   The driver skeleton is mainly based on mct_u232.c and various other 
+ *   pieces of code shamelessly copied from the drivers/usb/serial/ directory.
+ */
+
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+#include "usb-serial.h"
+#include "kl5kusb105.h"
+
+static int debug;
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v0.3a"
+#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>"
+#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
+
+
+/*
+ * Function prototypes
+ */
+static int  klsi_105_startup	         (struct usb_serial *serial);
+static void klsi_105_shutdown	         (struct usb_serial *serial);
+static int  klsi_105_open	         (struct usb_serial_port *port,
+					  struct file *filp);
+static void klsi_105_close	         (struct usb_serial_port *port,
+					  struct file *filp);
+static int  klsi_105_write	         (struct usb_serial_port *port,
+					  const unsigned char *buf,
+					  int count);
+static void klsi_105_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
+static int  klsi_105_chars_in_buffer     (struct usb_serial_port *port);
+static int  klsi_105_write_room          (struct usb_serial_port *port);
+
+static void klsi_105_read_bulk_callback  (struct urb *urb, struct pt_regs *regs);
+static void klsi_105_set_termios         (struct usb_serial_port *port,
+					  struct termios * old);
+static int  klsi_105_ioctl	         (struct usb_serial_port *port,
+					  struct file * file,
+					  unsigned int cmd,
+					  unsigned long arg);
+static void klsi_105_throttle		 (struct usb_serial_port *port);
+static void klsi_105_unthrottle		 (struct usb_serial_port *port);
+/*
+static void klsi_105_break_ctl	         (struct usb_serial_port *port,
+					  int break_state );
+ */
+static int  klsi_105_tiocmget	         (struct usb_serial_port *port,
+					  struct file *file);
+static int  klsi_105_tiocmset	         (struct usb_serial_port *port,
+					  struct file *file, unsigned int set,
+					  unsigned int clear);
+
+/*
+ * All of the device info needed for the KLSI converters.
+ */
+static struct usb_device_id id_table [] = {
+	{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
+	{ USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
+	{ }		/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static struct usb_driver kl5kusb105d_driver = {
+	.owner =	THIS_MODULE,
+	.name =		"kl5kusb105d",
+	.probe =	usb_serial_probe,
+	.disconnect =	usb_serial_disconnect,
+	.id_table =	id_table,
+};
+
+static struct usb_serial_device_type kl5kusb105d_device = {
+	.owner =             THIS_MODULE,
+	.name =		     "KL5KUSB105D / PalmConnect",
+	.short_name =	     "kl5kusb105d",
+	.id_table =	     id_table,
+	.num_interrupt_in =  1,
+	.num_bulk_in =	     1,
+	.num_bulk_out =	     1,
+	.num_ports =	     1,
+	.open =		     klsi_105_open,
+	.close =	     klsi_105_close,
+	.write =	     klsi_105_write,
+	.write_bulk_callback = klsi_105_write_bulk_callback,
+	.chars_in_buffer =   klsi_105_chars_in_buffer,
+	.write_room =        klsi_105_write_room,
+	.read_bulk_callback =klsi_105_read_bulk_callback,
+	.ioctl =	     klsi_105_ioctl,
+	.set_termios =	     klsi_105_set_termios,
+	/*.break_ctl =	     klsi_105_break_ctl,*/
+	.tiocmget =          klsi_105_tiocmget,
+	.tiocmset =          klsi_105_tiocmset,
+	.attach =	     klsi_105_startup,
+	.shutdown =	     klsi_105_shutdown,
+	.throttle =	     klsi_105_throttle,
+	.unthrottle =	     klsi_105_unthrottle,
+};
+
+struct klsi_105_port_settings {
+	__u8	pktlen;		/* always 5, it seems */
+	__u8	baudrate;
+	__u8	databits;
+	__u8	unknown1;
+	__u8	unknown2;
+} __attribute__ ((packed));
+
+/* we implement a pool of NUM_URBS urbs per usb_serial */
+#define NUM_URBS			1
+#define URB_TRANSFER_BUFFER_SIZE	64
+struct klsi_105_private {
+	struct klsi_105_port_settings	cfg;
+	struct termios			termios;
+	unsigned long			line_state; /* modem line settings */
+	/* write pool */
+	struct urb *			write_urb_pool[NUM_URBS];
+	spinlock_t			lock;
+	unsigned long			bytes_in;
+	unsigned long			bytes_out;
+};
+
+
+/*
+ * Handle vendor specific USB requests
+ */
+
+
+#define KLSI_TIMEOUT	 5000 /* default urb timeout */
+
+static int klsi_105_chg_port_settings(struct usb_serial_port *port,
+				      struct klsi_105_port_settings *settings)
+{
+	int rc;
+
+        rc = usb_control_msg(port->serial->dev,
+			     usb_sndctrlpipe(port->serial->dev, 0),
+			     KL5KUSB105A_SIO_SET_DATA,
+                             USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
+			     0, /* value */
+			     0, /* index */
+			     settings,
+			     sizeof(struct klsi_105_port_settings),
+			     KLSI_TIMEOUT);
+	if (rc < 0)
+		err("Change port settings failed (error = %d)", rc);
+	info("%s - %d byte block, baudrate %x, databits %d, u1 %d, u2 %d",
+	    __FUNCTION__,
+	    settings->pktlen,
+	    settings->baudrate, settings->databits,
+	    settings->unknown1, settings->unknown2);
+        return rc;
+} /* klsi_105_chg_port_settings */
+
+/* translate a 16-bit status value from the device to linux's TIO bits */
+static unsigned long klsi_105_status2linestate(const __u16 status)
+{
+	unsigned long res = 0;
+
+	res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
+	      | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
+	      ;
+
+	return res;
+}
+/* 
+ * Read line control via vendor command and return result through
+ * *line_state_p 
+ */
+/* It seems that the status buffer has always only 2 bytes length */
+#define KLSI_STATUSBUF_LEN	2
+static int klsi_105_get_line_state(struct usb_serial_port *port,
+				   unsigned long *line_state_p)
+{
+	int rc;
+	__u8 status_buf[KLSI_STATUSBUF_LEN] = { -1,-1};
+	__u16 status;
+
+	info("%s - sending SIO Poll request", __FUNCTION__);
+        rc = usb_control_msg(port->serial->dev,
+			     usb_rcvctrlpipe(port->serial->dev, 0),
+			     KL5KUSB105A_SIO_POLL,
+                             USB_TYPE_VENDOR | USB_DIR_IN,
+			     0, /* value */
+			     0, /* index */
+			     status_buf, KLSI_STATUSBUF_LEN,
+			     10000
+			     );
+	if (rc < 0)
+		err("Reading line status failed (error = %d)", rc);
+	else {
+		status = status_buf[0] + (status_buf[1]<<8);
+
+		info("%s - read status %x %x", __FUNCTION__,
+		     status_buf[0], status_buf[1]);
+
+		*line_state_p = klsi_105_status2linestate(status);
+	}
+
+        return rc;
+}
+
+
+/*
+ * Driver's tty interface functions
+ */
+
+static int klsi_105_startup (struct usb_serial *serial)
+{
+	struct klsi_105_private *priv;
+	int i;
+
+	/* check if we support the product id (see keyspan.c)
+	 * FIXME
+	 */
+
+	/* allocate the private data structure */
+	for (i=0; i<serial->num_ports; i++) {
+		int j;
+		priv = kmalloc(sizeof(struct klsi_105_private),
+						   GFP_KERNEL);
+		if (!priv) {
+			dbg("%skmalloc for klsi_105_private failed.", __FUNCTION__);
+			return -ENOMEM;
+		}
+		/* set initial values for control structures */
+		priv->cfg.pktlen    = 5;
+		priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
+		priv->cfg.databits  = kl5kusb105a_dtb_8;
+		priv->cfg.unknown1  = 0;
+		priv->cfg.unknown2  = 1;
+
+		priv->line_state    = 0;
+
+		priv->bytes_in	    = 0;
+		priv->bytes_out	    = 0;
+		usb_set_serial_port_data(serial->port[i], priv);
+
+		spin_lock_init (&priv->lock);
+		for (j=0; j<NUM_URBS; j++) {
+			struct urb* urb = usb_alloc_urb(0, GFP_KERNEL);
+
+			priv->write_urb_pool[j] = urb;
+			if (urb == NULL) {
+				err("No more urbs???");
+				continue;
+			}
+
+			urb->transfer_buffer = NULL;
+			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE,
+							GFP_KERNEL);
+			if (!urb->transfer_buffer) {
+				err("%s - out of memory for urb buffers.", __FUNCTION__);
+				continue;
+			}
+		}
+
+		/* priv->termios is left uninitalized until port opening */
+		init_waitqueue_head(&serial->port[i]->write_wait);
+	}
+	
+	return (0);
+} /* klsi_105_startup */
+
+
+static void klsi_105_shutdown (struct usb_serial *serial)
+{
+	int i;
+	
+	dbg("%s", __FUNCTION__);
+
+	/* stop reads and writes on all ports */
+	for (i=0; i < serial->num_ports; ++i) {
+		struct klsi_105_private *priv = usb_get_serial_port_data(serial->port[i]);
+		unsigned long flags;
+
+		if (priv) {
+			/* kill our write urb pool */
+			int j;
+			struct urb **write_urbs = priv->write_urb_pool;
+			spin_lock_irqsave(&priv->lock,flags);
+
+			for (j = 0; j < NUM_URBS; j++) {
+				if (write_urbs[j]) {
+					/* FIXME - uncomment the following
+					 * usb_kill_urb call when the host
+					 * controllers get fixed to set
+					 * urb->dev = NULL after the urb is
+					 * finished.  Otherwise this call
+					 * oopses. */
+					/* usb_kill_urb(write_urbs[j]); */
+					if (write_urbs[j]->transfer_buffer)
+						    kfree(write_urbs[j]->transfer_buffer);
+					usb_free_urb (write_urbs[j]);
+				}
+			}
+
+			spin_unlock_irqrestore (&priv->lock, flags);
+
+			kfree(priv);
+			usb_set_serial_port_data(serial->port[i], NULL);
+		}
+	}
+} /* klsi_105_shutdown */
+
+static int  klsi_105_open (struct usb_serial_port *port, struct file *filp)
+{
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	int retval = 0;
+	int rc;
+	int i;
+	unsigned long line_state;
+	struct klsi_105_port_settings cfg;
+	unsigned long flags;
+
+	dbg("%s port %d", __FUNCTION__, port->number);
+
+	/* force low_latency on so that our tty_push actually forces
+	 * the data through
+	 * port->tty->low_latency = 1; */
+
+	/* Do a defined restart:
+	 * Set up sane default baud rate and send the 'READ_ON'
+	 * vendor command. 
+	 * FIXME: set modem line control (how?)
+	 * Then read the modem line control and store values in
+	 * priv->line_state.
+	 */
+	cfg.pktlen   = 5;
+	cfg.baudrate = kl5kusb105a_sio_b9600;
+	cfg.databits = kl5kusb105a_dtb_8;
+	cfg.unknown1 = 0;
+	cfg.unknown2 = 1;
+	klsi_105_chg_port_settings(port, &cfg);
+	
+	/* set up termios structure */
+	spin_lock_irqsave (&priv->lock, flags);
+	priv->termios.c_iflag = port->tty->termios->c_iflag;
+	priv->termios.c_oflag = port->tty->termios->c_oflag;
+	priv->termios.c_cflag = port->tty->termios->c_cflag;
+	priv->termios.c_lflag = port->tty->termios->c_lflag;
+	for (i=0; i<NCCS; i++)
+		priv->termios.c_cc[i] = port->tty->termios->c_cc[i];
+	priv->cfg.pktlen   = cfg.pktlen;
+	priv->cfg.baudrate = cfg.baudrate;
+	priv->cfg.databits = cfg.databits;
+	priv->cfg.unknown1 = cfg.unknown1;
+	priv->cfg.unknown2 = cfg.unknown2;
+	spin_unlock_irqrestore (&priv->lock, flags);
+
+	/* READ_ON and urb submission */
+	usb_fill_bulk_urb(port->read_urb, port->serial->dev, 
+		      usb_rcvbulkpipe(port->serial->dev,
+				      port->bulk_in_endpointAddress),
+		      port->read_urb->transfer_buffer,
+		      port->read_urb->transfer_buffer_length,
+		      klsi_105_read_bulk_callback,
+		      port);
+
+	rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
+	if (rc) {
+		err("%s - failed submitting read urb, error %d", __FUNCTION__, rc);
+		retval = rc;
+		goto exit;
+	}
+
+	rc = usb_control_msg(port->serial->dev,
+			     usb_sndctrlpipe(port->serial->dev,0),
+			     KL5KUSB105A_SIO_CONFIGURE,
+			     USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
+			     KL5KUSB105A_SIO_CONFIGURE_READ_ON,
+			     0, /* index */
+			     NULL,
+			     0,
+			     KLSI_TIMEOUT);
+	if (rc < 0) {
+		err("Enabling read failed (error = %d)", rc);
+		retval = rc;
+	} else 
+		dbg("%s - enabled reading", __FUNCTION__);
+
+	rc = klsi_105_get_line_state(port, &line_state);
+	if (rc >= 0) {
+		spin_lock_irqsave (&priv->lock, flags);
+		priv->line_state = line_state;
+		spin_unlock_irqrestore (&priv->lock, flags);
+		dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
+		retval = 0;
+	} else
+		retval = rc;
+
+exit:
+	return retval;
+} /* klsi_105_open */
+
+
+static void klsi_105_close (struct usb_serial_port *port, struct file *filp)
+{
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	int rc;
+
+	dbg("%s port %d", __FUNCTION__, port->number);
+
+	/* send READ_OFF */
+	rc = usb_control_msg (port->serial->dev,
+			      usb_sndctrlpipe(port->serial->dev, 0),
+			      KL5KUSB105A_SIO_CONFIGURE,
+			      USB_TYPE_VENDOR | USB_DIR_OUT,
+			      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
+			      0, /* index */
+			      NULL, 0,
+			      KLSI_TIMEOUT);
+	if (rc < 0)
+		    err("Disabling read failed (error = %d)", rc);
+
+	/* shutdown our bulk reads and writes */
+	usb_kill_urb(port->write_urb);
+	usb_kill_urb(port->read_urb);
+	/* unlink our write pool */
+	/* FIXME */
+	/* wgg - do I need this? I think so. */
+	usb_kill_urb(port->interrupt_in_urb);
+	info("kl5kusb105 port stats: %ld bytes in, %ld bytes out", priv->bytes_in, priv->bytes_out);
+} /* klsi_105_close */
+
+
+/* We need to write a complete 64-byte data block and encode the
+ * number actually sent in the first double-byte, LSB-order. That 
+ * leaves at most 62 bytes of payload.
+ */
+#define KLSI_105_DATA_OFFSET	2   /* in the bulk urb data block */
+
+
+static int klsi_105_write (struct usb_serial_port *port,
+			   const unsigned char *buf, int count)
+{
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	int result, size;
+	int bytes_sent=0;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	while (count > 0) {
+		/* try to find a free urb (write 0 bytes if none) */
+		struct urb *urb = NULL;
+		unsigned long flags;
+		int i;
+		/* since the pool is per-port we might not need the spin lock !? */
+		spin_lock_irqsave (&priv->lock, flags);
+		for (i=0; i<NUM_URBS; i++) {
+			if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
+				urb = priv->write_urb_pool[i];
+				dbg("%s - using pool URB %d", __FUNCTION__, i);
+				break;
+			}
+		}
+		spin_unlock_irqrestore (&priv->lock, flags);
+
+		if (urb==NULL) {
+			dbg("%s - no more free urbs", __FUNCTION__);
+			goto exit;
+		}
+
+		if (urb->transfer_buffer == NULL) {
+			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
+			if (urb->transfer_buffer == NULL) {
+				err("%s - no more kernel memory...", __FUNCTION__);
+				goto exit;
+			}
+		}
+
+		size = min (count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
+		size = min (size, URB_TRANSFER_BUFFER_SIZE - KLSI_105_DATA_OFFSET);
+
+		memcpy (urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
+
+		/* write payload size into transfer buffer */
+		((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
+		((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
+
+		/* set up our urb */
+		usb_fill_bulk_urb(urb, port->serial->dev,
+			      usb_sndbulkpipe(port->serial->dev,
+					      port->bulk_out_endpointAddress),
+			      urb->transfer_buffer,
+			      URB_TRANSFER_BUFFER_SIZE,
+			      klsi_105_write_bulk_callback,
+			      port);
+
+		/* send the data out the bulk port */
+		result = usb_submit_urb(urb, GFP_ATOMIC);
+		if (result) {
+			err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
+			goto exit;
+		}
+		buf += size;
+		bytes_sent += size;
+		count -= size;
+	}
+exit:
+	/* lockless, but it's for debug info only... */
+	priv->bytes_out+=bytes_sent;
+
+	return bytes_sent;	/* that's how much we wrote */
+} /* klsi_105_write */
+
+static void klsi_105_write_bulk_callback ( struct urb *urb, struct pt_regs *regs)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+	
+	if (urb->status) {
+		dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
+		    urb->status);
+		return;
+	}
+
+	/* from generic_write_bulk_callback */
+	schedule_work(&port->work);
+} /* klsi_105_write_bulk_completion_callback */
+
+
+/* return number of characters currently in the writing process */
+static int klsi_105_chars_in_buffer (struct usb_serial_port *port)
+{
+	int chars = 0;
+	int i;
+	unsigned long flags;
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+
+	spin_lock_irqsave (&priv->lock, flags);
+
+	for (i = 0; i < NUM_URBS; ++i) {
+		if (priv->write_urb_pool[i]->status == -EINPROGRESS) {
+			chars += URB_TRANSFER_BUFFER_SIZE;
+		}
+	}
+
+	spin_unlock_irqrestore (&priv->lock, flags);
+
+	dbg("%s - returns %d", __FUNCTION__, chars);
+	return (chars);
+}
+
+static int klsi_105_write_room (struct usb_serial_port *port)
+{
+	unsigned long flags;
+	int i;
+	int room = 0;
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+
+	spin_lock_irqsave (&priv->lock, flags);
+	for (i = 0; i < NUM_URBS; ++i) {
+		if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
+			room += URB_TRANSFER_BUFFER_SIZE;
+		}
+	}
+
+	spin_unlock_irqrestore (&priv->lock, flags);
+
+	dbg("%s - returns %d", __FUNCTION__, room);
+	return (room);
+}
+
+
+
+static void klsi_105_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	struct tty_struct *tty;
+	unsigned char *data = urb->transfer_buffer;
+	int rc;
+
+        dbg("%s - port %d", __FUNCTION__, port->number);
+
+	/* The urb might have been killed. */
+        if (urb->status) {
+                dbg("%s - nonzero read bulk status received: %d", __FUNCTION__,
+		    urb->status);
+                return;
+        }
+	
+	/* The data received is again preceded by a length double-byte in LSB-
+	 * first order (see klsi_105_write() )
+	 */
+	if (urb->actual_length == 0) {
+		/* empty urbs seem to happen, we ignore them */
+		/* dbg("%s - emtpy URB", __FUNCTION__); */
+	       ;
+	} else if (urb->actual_length <= 2) {
+		dbg("%s - size %d URB not understood", __FUNCTION__,
+		    urb->actual_length);
+		usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
+				      urb->actual_length, data);
+	} else {
+		int i;
+		int bytes_sent = ((__u8 *) data)[0] +
+				 ((unsigned int) ((__u8 *) data)[1] << 8);
+		tty = port->tty;
+		/* we should immediately resubmit the URB, before attempting
+		 * to pass the data on to the tty layer. But that needs locking
+		 * against re-entry an then mixed-up data because of
+		 * intermixed tty_flip_buffer_push()s
+		 * FIXME
+		 */ 
+		usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
+				      urb->actual_length, data);
+
+		if (bytes_sent + 2 > urb->actual_length) {
+			dbg("%s - trying to read more data than available"
+			    " (%d vs. %d)", __FUNCTION__,
+			    bytes_sent+2, urb->actual_length);
+			/* cap at implied limit */
+			bytes_sent = urb->actual_length - 2;
+		}
+
+		for (i = 2; i < 2+bytes_sent; i++) {
+			/* if we insert more than TTY_FLIPBUF_SIZE characters,
+			 * we drop them. */
+			if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
+				tty_flip_buffer_push(tty);
+			}
+			/* this doesn't actually push the data through unless 
+			 * tty->low_latency is set */
+			tty_insert_flip_char(tty, ((__u8*) data)[i], 0);
+		}
+		tty_flip_buffer_push(tty);
+
+		/* again lockless, but debug info only */
+		priv->bytes_in += bytes_sent;
+	}
+	/* Continue trying to always read  */
+	usb_fill_bulk_urb(port->read_urb, port->serial->dev, 
+		      usb_rcvbulkpipe(port->serial->dev,
+				      port->bulk_in_endpointAddress),
+		      port->read_urb->transfer_buffer,
+		      port->read_urb->transfer_buffer_length,
+		      klsi_105_read_bulk_callback,
+		      port);
+	rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+	if (rc)
+		err("%s - failed resubmitting read urb, error %d", __FUNCTION__, rc);
+} /* klsi_105_read_bulk_callback */
+
+
+static void klsi_105_set_termios (struct usb_serial_port *port,
+				  struct termios *old_termios)
+{
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	unsigned int iflag = port->tty->termios->c_iflag;
+	unsigned int old_iflag = old_termios->c_iflag;
+	unsigned int cflag = port->tty->termios->c_cflag;
+	unsigned int old_cflag = old_termios->c_cflag;
+	struct klsi_105_port_settings cfg;
+	unsigned long flags;
+	
+	/* lock while we are modifying the settings */
+	spin_lock_irqsave (&priv->lock, flags);
+	
+	/*
+	 * Update baud rate
+	 */
+	if( (cflag & CBAUD) != (old_cflag & CBAUD) ) {
+	        /* reassert DTR and (maybe) RTS on transition from B0 */
+		if( (old_cflag & CBAUD) == B0 ) {
+			dbg("%s: baud was B0", __FUNCTION__);
+#if 0
+			priv->control_state |= TIOCM_DTR;
+			/* don't set RTS if using hardware flow control */
+			if (!(old_cflag & CRTSCTS)) {
+				priv->control_state |= TIOCM_RTS;
+			}
+			mct_u232_set_modem_ctrl(serial, priv->control_state);
+#endif
+		}
+		
+		switch(cflag & CBAUD) {
+		case B0: /* handled below */
+			break;
+		case B1200: priv->cfg.baudrate = kl5kusb105a_sio_b1200;
+			break;
+		case B2400: priv->cfg.baudrate = kl5kusb105a_sio_b2400;
+			break;
+		case B4800: priv->cfg.baudrate = kl5kusb105a_sio_b4800;
+			break;
+		case B9600: priv->cfg.baudrate = kl5kusb105a_sio_b9600;
+			break;
+		case B19200: priv->cfg.baudrate = kl5kusb105a_sio_b19200;
+			break;
+		case B38400: priv->cfg.baudrate = kl5kusb105a_sio_b38400;
+			break;
+		case B57600: priv->cfg.baudrate = kl5kusb105a_sio_b57600;
+			break;
+		case B115200: priv->cfg.baudrate = kl5kusb105a_sio_b115200;
+			break;
+		default:
+			err("KLSI USB->Serial converter:"
+			    " unsupported baudrate request, using default"
+			    " of 9600");
+			priv->cfg.baudrate = kl5kusb105a_sio_b9600;
+			break;
+		}
+		if ((cflag & CBAUD) == B0 ) {
+			dbg("%s: baud is B0", __FUNCTION__);
+			/* Drop RTS and DTR */
+			/* maybe this should be simulated by sending read
+			 * disable and read enable messages?
+			 */
+			;
+#if 0
+			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+        		mct_u232_set_modem_ctrl(serial, priv->control_state);
+#endif
+		}
+	}
+
+	if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
+		/* set the number of data bits */
+		switch (cflag & CSIZE) {
+		case CS5:
+			dbg("%s - 5 bits/byte not supported", __FUNCTION__);
+			spin_unlock_irqrestore (&priv->lock, flags);
+			return ;
+		case CS6:
+			dbg("%s - 6 bits/byte not supported", __FUNCTION__);
+			spin_unlock_irqrestore (&priv->lock, flags);
+			return ;
+		case CS7:
+			priv->cfg.databits = kl5kusb105a_dtb_7;
+			break;
+		case CS8:
+			priv->cfg.databits = kl5kusb105a_dtb_8;
+			break;
+		default:
+			err("CSIZE was not CS5-CS8, using default of 8");
+			priv->cfg.databits = kl5kusb105a_dtb_8;
+			break;
+		}
+	}
+
+	/*
+	 * Update line control register (LCR)
+	 */
+	if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
+	    || (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
+		
+#if 0
+		priv->last_lcr = 0;
+
+		/* set the parity */
+		if (cflag & PARENB)
+			priv->last_lcr |= (cflag & PARODD) ?
+				MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
+		else
+			priv->last_lcr |= MCT_U232_PARITY_NONE;
+
+		/* set the number of stop bits */
+		priv->last_lcr |= (cflag & CSTOPB) ?
+			MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
+
+		mct_u232_set_line_ctrl(serial, priv->last_lcr);
+#endif
+		;
+	}
+	
+	/*
+	 * Set flow control: well, I do not really now how to handle DTR/RTS.
+	 * Just do what we have seen with SniffUSB on Win98.
+	 */
+	if( (iflag & IXOFF) != (old_iflag & IXOFF)
+	    || (iflag & IXON) != (old_iflag & IXON)
+	    ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS) ) {
+		
+		/* Drop DTR/RTS if no flow control otherwise assert */
+#if 0
+		if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
+			priv->control_state |= TIOCM_DTR | TIOCM_RTS;
+		else
+			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+		mct_u232_set_modem_ctrl(serial, priv->control_state);
+#endif
+		;
+	}
+	memcpy (&cfg, &priv->cfg, sizeof(cfg));
+	spin_unlock_irqrestore (&priv->lock, flags);
+	
+	/* now commit changes to device */
+	klsi_105_chg_port_settings(port, &cfg);
+} /* klsi_105_set_termios */
+
+
+#if 0
+static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
+{
+	struct usb_serial *serial = port->serial;
+	struct mct_u232_private *priv = (struct mct_u232_private *)port->private;
+	unsigned char lcr = priv->last_lcr;
+
+	dbg("%sstate=%d", __FUNCTION__, break_state);
+
+	if (break_state)
+		lcr |= MCT_U232_SET_BREAK;
+
+	mct_u232_set_line_ctrl(serial, lcr);
+} /* mct_u232_break_ctl */
+#endif
+
+static int klsi_105_tiocmget (struct usb_serial_port *port, struct file *file)
+{
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	unsigned long flags;
+	int rc;
+	unsigned long line_state;
+	dbg("%s - request, just guessing", __FUNCTION__);
+
+	rc = klsi_105_get_line_state(port, &line_state);
+	if (rc < 0) {
+		err("Reading line control failed (error = %d)", rc);
+		/* better return value? EAGAIN? */
+		return rc;
+	}
+
+	spin_lock_irqsave (&priv->lock, flags);
+	priv->line_state = line_state;
+	spin_unlock_irqrestore (&priv->lock, flags);
+	dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
+	return (int)line_state;
+}
+
+static int klsi_105_tiocmset (struct usb_serial_port *port, struct file *file,
+			      unsigned int set, unsigned int clear)
+{
+	int retval = -EINVAL;
+	
+	dbg("%s", __FUNCTION__);
+
+/* if this ever gets implemented, it should be done something like this:
+	struct usb_serial *serial = port->serial;
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	unsigned long flags;
+	int control;
+
+	spin_lock_irqsave (&priv->lock, flags);
+	if (set & TIOCM_RTS)
+		priv->control_state |= TIOCM_RTS;
+	if (set & TIOCM_DTR)
+		priv->control_state |= TIOCM_DTR;
+	if (clear & TIOCM_RTS)
+		priv->control_state &= ~TIOCM_RTS;
+	if (clear & TIOCM_DTR)
+		priv->control_state &= ~TIOCM_DTR;
+	control = priv->control_state;
+	spin_unlock_irqrestore (&priv->lock, flags);
+	retval = mct_u232_set_modem_ctrl(serial, control);
+*/
+	return retval;
+}
+					
+static int klsi_105_ioctl (struct usb_serial_port *port, struct file * file,
+			   unsigned int cmd, unsigned long arg)
+{
+	struct klsi_105_private *priv = usb_get_serial_port_data(port);
+	void __user *user_arg = (void __user *)arg;
+	
+	dbg("%scmd=0x%x", __FUNCTION__, cmd);
+
+	/* Based on code from acm.c and others */
+	switch (cmd) {
+	case TIOCMIWAIT:
+		/* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
+		/* TODO */
+		dbg("%s - TIOCMIWAIT not handled", __FUNCTION__);
+		return -ENOIOCTLCMD;
+	case TIOCGICOUNT:
+		/* return count of modemline transitions */
+		/* TODO */
+		dbg("%s - TIOCGICOUNT not handled", __FUNCTION__);
+		return -ENOIOCTLCMD;
+	case TCGETS:
+		/* return current info to caller */
+		dbg("%s - TCGETS data faked/incomplete", __FUNCTION__);
+
+		if (!access_ok(VERIFY_WRITE, user_arg, sizeof(struct termios)))
+			return -EFAULT;
+
+		if (kernel_termios_to_user_termios((struct termios __user *)arg,
+						   &priv->termios))
+			return -EFAULT;
+		return 0;
+	case TCSETS:
+		/* set port termios to the one given by the user */
+		dbg("%s - TCSETS not handled", __FUNCTION__);
+
+		if (!access_ok(VERIFY_READ, user_arg, sizeof(struct termios)))
+			return -EFAULT;
+
+		if (user_termios_to_kernel_termios(&priv->termios,
+						   (struct termios __user *)arg))
+			return -EFAULT;
+		klsi_105_set_termios(port, &priv->termios);
+		return 0;
+	case TCSETSW: {
+		/* set port termios and try to wait for completion of last
+		 * write operation */
+		/* We guess here. If there are not too many write urbs
+		 * outstanding, we lie. */
+		/* what is the right way to wait here? schedule() ? */
+	        /*
+		while (klsi_105_chars_in_buffer(port) > (NUM_URBS / 4 ) * URB_TRANSFER_BUFFER_SIZE)
+			    schedule();
+		 */
+		return -ENOIOCTLCMD;
+		      }
+	default:
+		dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
+		return(-ENOIOCTLCMD);
+		break;
+	}
+	return 0;
+} /* klsi_105_ioctl */
+
+static void klsi_105_throttle (struct usb_serial_port *port)
+{
+	dbg("%s - port %d", __FUNCTION__, port->number);
+	usb_kill_urb(port->read_urb);
+}
+
+static void klsi_105_unthrottle (struct usb_serial_port *port)
+{
+	int result;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	port->read_urb->dev = port->serial->dev;
+	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+	if (result)
+		err("%s - failed submitting read urb, error %d", __FUNCTION__,
+		    result);
+}
+
+
+
+static int __init klsi_105_init (void)
+{
+	int retval;
+	retval = usb_serial_register(&kl5kusb105d_device);
+	if (retval)
+		goto failed_usb_serial_register;
+	retval = usb_register(&kl5kusb105d_driver);
+	if (retval)
+		goto failed_usb_register;
+
+	info(DRIVER_DESC " " DRIVER_VERSION);
+	return 0;
+failed_usb_register:
+	usb_serial_deregister(&kl5kusb105d_device);
+failed_usb_serial_register:
+	return retval;
+}
+
+
+static void __exit klsi_105_exit (void)
+{
+	usb_deregister (&kl5kusb105d_driver);
+	usb_serial_deregister (&kl5kusb105d_device);
+}
+
+
+module_init (klsi_105_init);
+module_exit (klsi_105_exit);
+
+MODULE_AUTHOR( DRIVER_AUTHOR );
+MODULE_DESCRIPTION( DRIVER_DESC );
+MODULE_LICENSE("GPL"); 
+
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "enable extensive debugging messages");
+
+/* vim: set sts=8 ts=8 sw=8: */