/*
* MCT (Magic Control Technology Corp.) USB RS232 Converter Driver
*
* Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
*
* 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.
*
* This program is largely derived from the Belkin USB Serial Adapter Driver
* (see belkin_sa.[ch]). All of the information about the device was acquired
* by using SniffUSB on Windows98. For technical details see mct_u232.h.
*
* William G. Greathouse and Greg Kroah-Hartman provided great help on how to
* do the reverse engineering and how to write a USB serial device driver.
*
* TO BE DONE, TO BE CHECKED:
* DTR/RTS signal handling may be incomplete or incorrect. I have mainly
* implemented what I have seen with SniffUSB or found in belkin_sa.c.
* For further TODOs check also belkin_sa.c.
*
* TEST STATUS:
* Basic tests have been performed with minicom/zmodem transfers and
* modem dialing under Linux 2.4.0-test10 (for me it works fine).
*
* 10-Nov-2001 Wolfgang Grandegger
* - Fixed an endianess problem with the baudrate selection for PowerPC.
*
* 06-Dec-2001 Martin Hamilton <martinh@gnu.org>
* Added support for the Belkin F5U109 DB9 adaptor
*
* 30-May-2001 Greg Kroah-Hartman
* switched from using spinlock to a semaphore, which fixes lots of problems.
*
* 04-May-2001 Stelian Pop
* - Set the maximum bulk output size for Sitecom U232-P25 model to 16 bytes
* instead of the device reported 32 (using 32 bytes causes many data
* loss, Windows driver uses 16 too).
*
* 02-May-2001 Stelian Pop
* - Fixed the baud calculation for Sitecom U232-P25 model
*
* 08-Apr-2001 gb
* - Identify version on module load.
*
* 06-Jan-2001 Cornel Ciocirlan
* - Added support for Sitecom U232-P25 model (Product Id 0x0230)
* - Added support for D-Link DU-H3SP USB BAY (Product Id 0x0200)
*
* 29-Nov-2000 Greg Kroah-Hartman
* - Added device id table to fit with 2.4.0-test11 structure.
* - took out DEAL_WITH_TWO_INT_IN_ENDPOINTS #define as it's not needed
* (lots of things will change if/when the usb-serial core changes to
* handle these issues.
*
* 27-Nov-2000 Wolfgang Grandegger
* A version for kernel 2.4.0-test10 released to the Linux community
* (via linux-usb-devel).
*/
#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 <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#ifdef CONFIG_USB_SERIAL_DEBUG
static int debug = 1;
#else
static int debug;
#endif
#include "usb-serial.h"
#include "mct_u232.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v1.1"
#define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
#define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
/*
* Some not properly written applications do not handle the return code of
* write() correctly. This can result in character losses. A work-a-round
* can be compiled in with the following definition. This work-a-round
* should _NOT_ be part of an 'official' kernel release, of course!
*/
#undef FIX_WRITE_RETURN_CODE_PROBLEM
#ifdef FIX_WRITE_RETURN_CODE_PROBLEM
static int write_blocking; /* disabled by default */
#endif
/*
* Function prototypes
*/
static int mct_u232_startup (struct usb_serial *serial);
static void mct_u232_shutdown (struct usb_serial *serial);
static int mct_u232_open (struct usb_serial_port *port,
struct file *filp);
static void mct_u232_close (struct usb_serial_port *port,
struct file *filp);
#ifdef FIX_WRITE_RETURN_CODE_PROBLEM
static int mct_u232_write (struct usb_serial_port *port,
int from_user,
const unsigned char *buf,
int count);
static void mct_u232_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
#endif
static void mct_u232_read_int_callback (struct urb *urb, struct pt_regs *regs);
static void mct_u232_set_termios (struct usb_serial_port *port,
struct termios * old);
static int mct_u232_ioctl (struct usb_serial_port *port,
struct file * file,
unsigned int cmd,
unsigned long arg);
static void mct_u232_break_ctl (struct usb_serial_port *port,
int break_state );
static int mct_u232_tiocmget (struct usb_serial_port *port,
struct file *file);
static int mct_u232_tiocmset (struct usb_serial_port *port,
struct file *file, unsigned int set,
unsigned int clear);
/*
* All of the device info needed for the MCT USB-RS232 converter.
*/
static struct usb_device_id id_table_combined [] = {
{ USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
{ USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
{ USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
{ USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, id_table_combined);
static struct usb_driver mct_u232_driver = {
.owner = THIS_MODULE,
.name = "mct_u232",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table_combined,
};
static struct usb_serial_device_type mct_u232_device = {
.owner = THIS_MODULE,
.name = "Magic Control Technology USB-RS232",
.short_name = "mct_u232",
.id_table = id_table_combined,
.num_interrupt_in = 2,
.num_bulk_in = 0,
.num_bulk_out = 1,
.num_ports = 1,
.open = mct_u232_open,
.close = mct_u232_close,
#ifdef FIX_WRITE_RETURN_CODE_PROBLEM
.write = mct_u232_write,
.write_bulk_callback = mct_u232_write_bulk_callback,
#endif
.read_int_callback = mct_u232_read_int_callback,
.ioctl = mct_u232_ioctl,
.set_termios = mct_u232_set_termios,
.break_ctl = mct_u232_break_ctl,
.tiocmget = mct_u232_tiocmget,
.tiocmset = mct_u232_tiocmset,
.attach = mct_u232_startup,
.shutdown = mct_u232_shutdown,
};
struct mct_u232_private {
spinlock_t lock;
unsigned long control_state; /* Modem Line Setting (TIOCM) */
unsigned char last_lcr; /* Line Control Register */
unsigned char last_lsr; /* Line Status Register */
unsigned char last_msr; /* Modem Status Register */
};
/*
* Handle vendor specific USB requests
*/
#define WDR_TIMEOUT (HZ * 5 ) /* default urb timeout */
static int mct_u232_calculate_baud_rate(struct usb_serial *serial, int value) {
if (serial->dev->descriptor.idProduct == MCT_U232_SITECOM_PID
|| serial->dev->descriptor.idProduct == MCT_U232_BELKIN_F5U109_PID) {
switch (value) {
case 300: return 0x01;
case 600: return 0x02; /* this one not tested */
case 1200: return 0x03;
case 2400: return 0x04;
case 4800: return 0x06;
case 9600: return 0x08;
case 19200: return 0x09;
case 38400: return 0x0a;
case 57600: return 0x0b;
case 115200: return 0x0c;
default: return -1; /* normally not reached */
}
}
else
return MCT_U232_BAUD_RATE(value);
}
static int mct_u232_set_baud_rate(struct usb_serial *serial, int value)
{
unsigned int divisor;
int rc;
divisor = cpu_to_le32(mct_u232_calculate_baud_rate(serial, value));
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_BAUD_RATE_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
0, 0, &divisor, MCT_U232_SET_BAUD_RATE_SIZE,
WDR_TIMEOUT);
if (rc < 0)
err("Set BAUD RATE %d failed (error = %d)", value, rc);
dbg("set_baud_rate: value: %d, divisor: 0x%x", value, divisor);
return rc;
} /* mct_u232_set_baud_rate */
static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
{
int rc;
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_LINE_CTRL_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
0, 0, &lcr, MCT_U232_SET_LINE_CTRL_SIZE,
WDR_TIMEOUT);
if (rc < 0)
err("Set LINE CTRL 0x%x failed (error = %d)", lcr, rc);
dbg("set_line_ctrl: 0x%x", lcr);
return rc;
} /* mct_u232_set_line_ctrl */
static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
unsigned long control_state)
{
int rc;
unsigned char mcr = MCT_U232_MCR_NONE;
if (control_state & TIOCM_DTR)
mcr |= MCT_U232_MCR_DTR;
if (control_state & TIOCM_RTS)
mcr |= MCT_U232_MCR_RTS;
rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCT_U232_SET_MODEM_CTRL_REQUEST,
MCT_U232_SET_REQUEST_TYPE,
0, 0, &mcr, MCT_U232_SET_MODEM_CTRL_SIZE,
WDR_TIMEOUT);
if (rc < 0)
err("Set MODEM CTRL 0x%x failed (error = %d)", mcr, rc);
dbg("set_modem_ctrl: state=0x%lx ==> mcr=0x%x", control_state, mcr);
return rc;
} /* mct_u232_set_modem_ctrl */
static int mct_u232_get_modem_stat(struct usb_serial *serial, unsigned char *msr)
{
int rc;
rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
MCT_U232_GET_MODEM_STAT_REQUEST,
MCT_U232_GET_REQUEST_TYPE,
0, 0, msr, MCT_U232_GET_MODEM_STAT_SIZE,
WDR_TIMEOUT);
if (rc < 0) {
err("Get MODEM STATus failed (error = %d)", rc);
*msr = 0;
}
dbg("get_modem_stat: 0x%x", *msr);
return rc;
} /* mct_u232_get_modem_stat */
static void mct_u232_msr_to_state(unsigned long *control_state, unsigned char msr)
{
/* Translate Control Line states */
if (msr & MCT_U232_MSR_DSR)
*control_state |= TIOCM_DSR;
else
*control_state &= ~TIOCM_DSR;
if (msr & MCT_U232_MSR_CTS)
*control_state |= TIOCM_CTS;
else
*control_state &= ~TIOCM_CTS;
if (msr & MCT_U232_MSR_RI)
*control_state |= TIOCM_RI;
else
*control_state &= ~TIOCM_RI;
if (msr & MCT_U232_MSR_CD)
*control_state |= TIOCM_CD;
else
*control_state &= ~TIOCM_CD;
dbg("msr_to_state: msr=0x%x ==> state=0x%lx", msr, *control_state);
} /* mct_u232_msr_to_state */
/*
* Driver's tty interface functions
*/
static int mct_u232_startup (struct usb_serial *serial)
{
struct mct_u232_private *priv;
/* allocate the private data structure */
priv = kmalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* set initial values for control structures */
spin_lock_init(&priv->lock);
priv->control_state = 0;
priv->last_lsr = 0;
priv->last_msr = 0;
usb_set_serial_port_data(serial->port[0], priv);
init_waitqueue_head(&serial->port[0]->write_wait);
return (0);
} /* mct_u232_startup */
static void mct_u232_shutdown (struct usb_serial *serial)
{
struct mct_u232_private *priv;
int i;
dbg("%s", __FUNCTION__);
for (i=0; i < serial->num_ports; ++i) {
/* My special items, the standard routines free my urbs */
priv = usb_get_serial_port_data(serial->port[i]);
if (priv)
kfree(priv);
}
} /* mct_u232_shutdown */
static int mct_u232_open (struct usb_serial_port *port, struct file *filp)
{
struct usb_serial *serial = port->serial;
struct mct_u232_private *priv = usb_get_serial_port_data(port);
int retval = 0;
unsigned long control_state;
unsigned long flags;
unsigned char last_lcr;
unsigned char last_msr;
dbg("%s port %d", __FUNCTION__, port->number);
/* Compensate for a hardware bug: although the Sitecom U232-P25
* device reports a maximum output packet size of 32 bytes,
* it seems to be able to accept only 16 bytes (and that's what
* SniffUSB says too...)
*/
if (serial->dev->descriptor.idProduct == MCT_U232_SITECOM_PID)
port->bulk_out_size = 16;
/* Do a defined restart: the normal serial device seems to
* always turn on DTR and RTS here, so do the same. I'm not
* sure if this is really necessary. But it should not harm
* either.
*/
spin_lock_irqsave(&priv->lock, flags);
if (port->tty->termios->c_cflag & CBAUD)
priv->control_state = TIOCM_DTR | TIOCM_RTS;
else
priv->control_state = 0;
priv->last_lcr = (MCT_U232_DATA_BITS_8 |
MCT_U232_PARITY_NONE |
MCT_U232_STOP_BITS_1);
control_state = priv->control_state;
last_lcr = priv->last_lcr;
spin_unlock_irqrestore(&priv->lock, flags);
mct_u232_set_modem_ctrl(serial, control_state);
mct_u232_set_line_ctrl(serial, last_lcr);
/* Read modem status and update control state */
mct_u232_get_modem_stat(serial, &last_msr);
spin_lock_irqsave(&priv->lock, flags);
priv->last_msr = last_msr;
mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
spin_unlock_irqrestore(&priv->lock, flags);
{
/* Puh, that's dirty */
struct usb_serial_port *rport;
rport = serial->port[1];
rport->tty = port->tty;
usb_set_serial_port_data(rport, usb_get_serial_port_data(port));
port->read_urb = rport->interrupt_in_urb;
}
port->read_urb->dev = port->serial->dev;
retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (retval) {
err("usb_submit_urb(read bulk) failed");
goto exit;
}
port->interrupt_in_urb->dev = port->serial->dev;
retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (retval)
err(" usb_submit_urb(read int) failed");
exit:
return 0;
} /* mct_u232_open */
static void mct_u232_close (struct usb_serial_port *port, struct file *filp)
{
dbg("%s port %d", __FUNCTION__, port->number);
if (port->serial->dev) {
/* shutdown our urbs */
usb_unlink_urb (port->write_urb);
usb_unlink_urb (port->read_urb);
usb_unlink_urb (port->interrupt_in_urb);
}
} /* mct_u232_close */
#ifdef FIX_WRITE_RETURN_CODE_PROBLEM
/* The generic routines work fine otherwise */
static int mct_u232_write (struct usb_serial_port *port, int from_user,
const unsigned char *buf, int count)
{
struct usb_serial *serial = port->serial;
int result, bytes_sent, size;
dbg("%s - port %d", __FUNCTION__, port->number);
if (count == 0) {
dbg("%s - write request of 0 bytes", __FUNCTION__);
return (0);
}
/* only do something if we have a bulk out endpoint */
if (!serial->num_bulk_out)
return(0);;
/* another write is still pending? */
if (port->write_urb->status == -EINPROGRESS) {
dbg("%s - already writing", __FUNCTION__);
return (0);
}
bytes_sent = 0;
while (count > 0) {
size = (count > port->bulk_out_size) ? port->bulk_out_size : count;
usb_serial_debug_data (__FILE__, __FUNCTION__, size, buf);
if (from_user) {
if (copy_from_user(port->write_urb->transfer_buffer, buf, size)) {
return -EFAULT;
}
}
else {
memcpy (port->write_urb->transfer_buffer, buf, size);
}
/* 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, size,
((serial->type->write_bulk_callback) ?
serial->type->write_bulk_callback :
mct_u232_write_bulk_callback),
port);
/* send the data out the bulk port */
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result) {
err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
return result;
}
bytes_sent += size;
if (write_blocking)
interruptible_sleep_on(&port->write_wait);
else
break;
buf += size;
count -= size;
}
return bytes_sent;
} /* mct_u232_write */
static void mct_u232_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct usb_serial *serial = port->serial;
struct tty_struct *tty = port->tty;
dbg("%s - port %d", __FUNCTION__, port->number);
if (!serial) {
dbg("%s - bad serial pointer, exiting", __FUNCTION__);
return;
}
if (urb->status) {
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
urb->status);
return;
}
if (write_blocking) {
wake_up_interruptible(&port->write_wait);
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
wake_up_interruptible(&tty->write_wait);
} else {
/* from generic_write_bulk_callback */
schedule_work(&port->work);
}
return;
} /* mct_u232_write_bulk_callback */
#endif
static void mct_u232_read_int_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct mct_u232_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
int status;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
goto exit;
}
if (!serial) {
dbg("%s - bad serial pointer, exiting", __FUNCTION__);
return;
}
usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
/*
* Work-a-round: handle the 'usual' bulk-in pipe here
*/
if (urb->transfer_buffer_length > 2) {
int i;
tty = port->tty;
if (urb->actual_length) {
for (i = 0; i < urb->actual_length ; ++i) {
tty_insert_flip_char(tty, data[i], 0);
}
tty_flip_buffer_push(tty);
}
goto exit;
}
/*
* The interrupt-in pipe signals exceptional conditions (modem line
* signal changes and errors). data[0] holds MSR, data[1] holds LSR.
*/
spin_lock_irqsave(&priv->lock, flags);
priv->last_msr = data[MCT_U232_MSR_INDEX];
/* Record Control Line states */
mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
#if 0
/* Not yet handled. See belin_sa.c for further information */
/* Now to report any errors */
priv->last_lsr = data[MCT_U232_LSR_INDEX];
/*
* 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 & MCT_U232_LSR_ERR) {
tty = port->tty;
/* Overrun Error */
if (priv->last_lsr & MCT_U232_LSR_OE) {
}
/* Parity Error */
if (priv->last_lsr & MCT_U232_LSR_PE) {
}
/* Framing Error */
if (priv->last_lsr & MCT_U232_LSR_FE) {
}
/* Break Indicator */
if (priv->last_lsr & MCT_U232_LSR_BI) {
}
}
#endif
spin_unlock_irqrestore(&priv->lock, flags);
exit:
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status)
err ("%s - usb_submit_urb failed with result %d",
__FUNCTION__, status);
} /* mct_u232_read_int_callback */
static void mct_u232_set_termios (struct usb_serial_port *port,
struct termios *old_termios)
{
struct usb_serial *serial = port->serial;
struct mct_u232_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;
unsigned long flags;
unsigned long control_state;
unsigned char last_lcr;
/* get a local copy of the current port settings */
spin_lock_irqsave(&priv->lock, flags);
control_state = priv->control_state;
last_lcr = priv->last_lcr;
spin_unlock_irqrestore(&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__);
control_state |= TIOCM_DTR;
/* don't set RTS if using hardware flow control */
if (!(old_cflag & CRTSCTS)) {
control_state |= TIOCM_RTS;
}
mct_u232_set_modem_ctrl(serial, control_state);
}
switch(cflag & CBAUD) {
case B0: /* handled below */
break;
case B300: mct_u232_set_baud_rate(serial, 300);
break;
case B600: mct_u232_set_baud_rate(serial, 600);
break;
case B1200: mct_u232_set_baud_rate(serial, 1200);
break;
case B2400: mct_u232_set_baud_rate(serial, 2400);
break;
case B4800: mct_u232_set_baud_rate(serial, 4800);
break;
case B9600: mct_u232_set_baud_rate(serial, 9600);
break;
case B19200: mct_u232_set_baud_rate(serial, 19200);
break;
case B38400: mct_u232_set_baud_rate(serial, 38400);
break;
case B57600: mct_u232_set_baud_rate(serial, 57600);
break;
case B115200: mct_u232_set_baud_rate(serial, 115200);
break;
default: err("MCT USB-RS232 converter: unsupported baudrate request, using default of 9600");
mct_u232_set_baud_rate(serial, 9600); break;
}
if ((cflag & CBAUD) == B0 ) {
dbg("%s: baud is B0", __FUNCTION__);
/* Drop RTS and DTR */
control_state &= ~(TIOCM_DTR | TIOCM_RTS);
mct_u232_set_modem_ctrl(serial, control_state);
}
}
/*
* Update line control register (LCR)
*/
if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
|| (cflag & CSIZE) != (old_cflag & CSIZE)
|| (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
last_lcr = 0;
/* set the parity */
if (cflag & PARENB)
last_lcr |= (cflag & PARODD) ?
MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
else
last_lcr |= MCT_U232_PARITY_NONE;
/* set the number of data bits */
switch (cflag & CSIZE) {
case CS5:
last_lcr |= MCT_U232_DATA_BITS_5; break;
case CS6:
last_lcr |= MCT_U232_DATA_BITS_6; break;
case CS7:
last_lcr |= MCT_U232_DATA_BITS_7; break;
case CS8:
last_lcr |= MCT_U232_DATA_BITS_8; break;
default:
err("CSIZE was not CS5-CS8, using default of 8");
last_lcr |= MCT_U232_DATA_BITS_8;
break;
}
/* set the number of stop bits */
last_lcr |= (cflag & CSTOPB) ?
MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
mct_u232_set_line_ctrl(serial, last_lcr);
}
/*
* 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 ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
control_state |= TIOCM_DTR | TIOCM_RTS;
else
control_state &= ~(TIOCM_DTR | TIOCM_RTS);
mct_u232_set_modem_ctrl(serial, control_state);
}
/* save off the modified port settings */
spin_lock_irqsave(&priv->lock, flags);
priv->control_state = control_state;
priv->last_lcr = last_lcr;
spin_unlock_irqrestore(&priv->lock, flags);
} /* mct_u232_set_termios */
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 = usb_get_serial_port_data(port);
unsigned char lcr;
unsigned long flags;
dbg("%sstate=%d", __FUNCTION__, break_state);
spin_lock_irqsave(&priv->lock, flags);
lcr = priv->last_lcr;
spin_unlock_irqrestore(&priv->lock, flags);
if (break_state)
lcr |= MCT_U232_SET_BREAK;
mct_u232_set_line_ctrl(serial, lcr);
} /* mct_u232_break_ctl */
static int mct_u232_tiocmget (struct usb_serial_port *port, struct file *file)
{
struct mct_u232_private *priv = usb_get_serial_port_data(port);
unsigned long control_state;
unsigned long flags;
dbg("%s", __FUNCTION__);
spin_lock_irqsave(&priv->lock, flags);
control_state = priv->control_state;
spin_unlock_irqrestore(&priv->lock, flags);
return control_state;
}
static int mct_u232_tiocmset (struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct usb_serial *serial = port->serial;
struct mct_u232_private *priv = usb_get_serial_port_data(port);
unsigned long control_state;
unsigned long flags;
dbg("%s", __FUNCTION__);
spin_lock_irqsave(&priv->lock, flags);
control_state = priv->control_state;
if (set & TIOCM_RTS)
control_state |= TIOCM_RTS;
if (set & TIOCM_DTR)
control_state |= TIOCM_DTR;
if (clear & TIOCM_RTS)
control_state &= ~TIOCM_RTS;
if (clear & TIOCM_DTR)
control_state &= ~TIOCM_DTR;
priv->control_state = control_state;
spin_unlock_irqrestore(&priv->lock, flags);
return mct_u232_set_modem_ctrl(serial, control_state);
}
static int mct_u232_ioctl (struct usb_serial_port *port, struct file * file,
unsigned int cmd, unsigned long 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 */
return( 0 );
case TIOCGICOUNT:
/* return count of modemline transitions */
/* TODO */
return 0;
default:
dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
return(-ENOIOCTLCMD);
break;
}
return 0;
} /* mct_u232_ioctl */
static int __init mct_u232_init (void)
{
int retval;
retval = usb_serial_register(&mct_u232_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&mct_u232_driver);
if (retval)
goto failed_usb_register;
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
failed_usb_register:
usb_serial_deregister(&mct_u232_device);
failed_usb_serial_register:
return retval;
}
static void __exit mct_u232_exit (void)
{
usb_deregister (&mct_u232_driver);
usb_serial_deregister (&mct_u232_device);
}
module_init (mct_u232_init);
module_exit(mct_u232_exit);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");
#ifdef FIX_WRITE_RETURN_CODE_PROBLEM
MODULE_PARM(write_blocking, "i");
MODULE_PARM_DESC(write_blocking,
"The write function will block to write out all data");
#endif
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");
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