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|
/*
* Belkin USB Serial Adapter Driver
*
* Copyright (C) 2000 William Greathouse (wgreathouse@smva.com)
* Copyright (C) 2000-2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
*
* This program is largely derived from work by the linux-usb group
* and associated source files. Please see the usb/serial files for
* individual credits and copyrights.
*
* 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.
*
* See Documentation/usb/usb-serial.txt for more information on using this
* driver
*
* TODO:
* -- Add true modem contol line query capability. Currently we track the
* states reported by the interrupt and the states we request.
* -- Add support for flush commands
*/
#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 <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "belkin_sa.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v1.3"
#define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
#define DRIVER_DESC "USB Belkin Serial converter driver"
/* function prototypes for a Belkin USB Serial Adapter F5U103 */
static int belkin_sa_port_probe(struct usb_serial_port *port);
static int belkin_sa_port_remove(struct usb_serial_port *port);
static int belkin_sa_open(struct tty_struct *tty,
struct usb_serial_port *port);
static void belkin_sa_close(struct usb_serial_port *port);
static void belkin_sa_read_int_callback(struct urb *urb);
static void belkin_sa_process_read_urb(struct urb *urb);
static void belkin_sa_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios * old);
static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
static int belkin_sa_tiocmget(struct tty_struct *tty);
static int belkin_sa_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
{ USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
{ USB_DEVICE(PERACOM_VID, PERACOM_PID) },
{ USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
{ USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
{ USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
/* All of the device info needed for the serial converters */
static struct usb_serial_driver belkin_device = {
.driver = {
.owner = THIS_MODULE,
.name = "belkin",
},
.description = "Belkin / Peracom / GoHubs USB Serial Adapter",
.id_table = id_table,
.num_ports = 1,
.open = belkin_sa_open,
.close = belkin_sa_close,
.read_int_callback = belkin_sa_read_int_callback,
.process_read_urb = belkin_sa_process_read_urb,
.set_termios = belkin_sa_set_termios,
.break_ctl = belkin_sa_break_ctl,
.tiocmget = belkin_sa_tiocmget,
.tiocmset = belkin_sa_tiocmset,
.port_probe = belkin_sa_port_probe,
.port_remove = belkin_sa_port_remove,
};
static struct usb_serial_driver * const serial_drivers[] = {
&belkin_device, NULL
};
struct belkin_sa_private {
spinlock_t lock;
unsigned long control_state;
unsigned char last_lsr;
unsigned char last_msr;
int bad_flow_control;
};
/*
* ***************************************************************************
* Belkin USB Serial Adapter F5U103 specific driver functions
* ***************************************************************************
*/
#define WDR_TIMEOUT 5000 /* default urb timeout */
/* assumes that struct usb_serial *serial is available */
#define BSA_USB_CMD(c, v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
(c), BELKIN_SA_SET_REQUEST_TYPE, \
(v), 0, NULL, 0, WDR_TIMEOUT)
static int belkin_sa_port_probe(struct usb_serial_port *port)
{
struct usb_device *dev = port->serial->dev;
struct belkin_sa_private *priv;
priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->lock);
priv->control_state = 0;
priv->last_lsr = 0;
priv->last_msr = 0;
/* see comments at top of file */
priv->bad_flow_control =
(le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
dev_info(&dev->dev, "bcdDevice: %04x, bfc: %d\n",
le16_to_cpu(dev->descriptor.bcdDevice),
priv->bad_flow_control);
usb_set_serial_port_data(port, priv);
return 0;
}
static int belkin_sa_port_remove(struct usb_serial_port *port)
{
struct belkin_sa_private *priv;
priv = usb_get_serial_port_data(port);
kfree(priv);
return 0;
}
static int belkin_sa_open(struct tty_struct *tty,
struct usb_serial_port *port)
{
int retval;
retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (retval) {
dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
return retval;
}
retval = usb_serial_generic_open(tty, port);
if (retval)
usb_kill_urb(port->interrupt_in_urb);
return retval;
}
static void belkin_sa_close(struct usb_serial_port *port)
{
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
}
static void belkin_sa_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct belkin_sa_private *priv;
unsigned char *data = urb->transfer_buffer;
int retval;
int status = urb->status;
unsigned long flags;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
__func__, status);
return;
default:
dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
__func__, status);
goto exit;
}
usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
/* Handle known interrupt data */
/* ignore data[0] and data[1] */
priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&priv->lock, flags);
priv->last_msr = data[BELKIN_SA_MSR_INDEX];
/* Record Control Line states */
if (priv->last_msr & BELKIN_SA_MSR_DSR)
priv->control_state |= TIOCM_DSR;
else
priv->control_state &= ~TIOCM_DSR;
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;
priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
spin_unlock_irqrestore(&priv->lock, flags);
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&port->dev, "%s - usb_submit_urb failed with "
"result %d\n", __func__, retval);
}
static void belkin_sa_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct belkin_sa_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data =
|