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linux/drivers/usb/serial/kobil_sct.c
Alan Cox 33f0f88f1c [PATCH] TTY layer buffering revamp 
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.

This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.

When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.

For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).

Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.

The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.

I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.

Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real.  That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.

Description:

tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification].  It
does now also return the number of chars inserted

There are also

tty_buffer_request_room(tty, len)

which asks for a buffer block of the length requested and returns the space
found.  This improves efficiency with hardware that knows how much to
transfer.

and tty_insert_flip_string_flags(tty, str, flags, len)

to insert a string of characters and flags

For a smart interface the usual code is

    len = tty_request_buffer_room(tty, amount_hardware_says);
    tty_insert_flip_string(tty, buffer_from_card, len);

More description!

At the moment tty buffers are attached directly to the tty.  This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)

I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers.  This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.

So far so good.  Lots of drivers reference tty->flip.*.  Several of them also
call directly and unsafely into function pointers it provides.  This will all
break.  Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.

At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say

 int tty_buffer_request_room(tty, size)

Try and ensure at least size bytes are available, returns actual room (may be
zero).  At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative.  (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space.  The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.

 int tty_insert_flip_char(tty, ch, flag)

As before insert a character if there is room.  Now returns 1 for success, 0
for failure.

 int tty_insert_flip_string(tty, str, len)

Insert a block of non error characters.  Returns the number inserted.

 int tty_prepare_flip_string(tty, strptr, len)

Adjust the buffer to allow len characters to be added.  Returns a buffer
pointer in strptr and the length available.  This allows for hardware that
needs to use functions like insl or mencpy_fromio.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:59 -08:00

771 lines
23 KiB
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/*
* KOBIL USB Smart Card Terminal Driver
*
* Copyright (C) 2002 KOBIL Systems GmbH
* Author: Thomas Wahrenbruch
*
* Contact: linuxusb@kobil.de
*
* 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.
*
* Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
* patience.
*
* Supported readers: USB TWIN, KAAN Standard Plus and SecOVID Reader Plus
* (Adapter K), B1 Professional and KAAN Professional (Adapter B)
*
* (21/05/2004) tw
* Fix bug with P'n'P readers
*
* (28/05/2003) tw
* Add support for KAAN SIM
*
* (12/09/2002) tw
* Adapted to 2.5.
*
* (11/08/2002) tw
* Initial version.
*/
#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>
#include <linux/ioctl.h>
#include "usb-serial.h"
#include "kobil_sct.h"
static int debug;
/* Version Information */
#define DRIVER_VERSION "21/05/2004"
#define DRIVER_AUTHOR "KOBIL Systems GmbH - http://www.kobil.com"
#define DRIVER_DESC "KOBIL USB Smart Card Terminal Driver (experimental)"
#define KOBIL_VENDOR_ID 0x0D46
#define KOBIL_ADAPTER_B_PRODUCT_ID 0x2011
#define KOBIL_ADAPTER_K_PRODUCT_ID 0x2012
#define KOBIL_USBTWIN_PRODUCT_ID 0x0078
#define KOBIL_KAAN_SIM_PRODUCT_ID 0x0081
#define KOBIL_TIMEOUT 500
#define KOBIL_BUF_LENGTH 300
/* Function prototypes */
static int kobil_startup (struct usb_serial *serial);
static void kobil_shutdown (struct usb_serial *serial);
static int kobil_open (struct usb_serial_port *port, struct file *filp);
static void kobil_close (struct usb_serial_port *port, struct file *filp);
static int kobil_write (struct usb_serial_port *port,
const unsigned char *buf, int count);
static int kobil_write_room(struct usb_serial_port *port);
static int kobil_ioctl(struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg);
static int kobil_tiocmget(struct usb_serial_port *port, struct file *file);
static int kobil_tiocmset(struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear);
static void kobil_read_int_callback( struct urb *urb, struct pt_regs *regs );
static void kobil_write_callback( struct urb *purb, struct pt_regs *regs );
static struct usb_device_id id_table [] = {
{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_B_PRODUCT_ID) },
{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_K_PRODUCT_ID) },
{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_USBTWIN_PRODUCT_ID) },
{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_KAAN_SIM_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, id_table);
static struct usb_driver kobil_driver = {
.name = "kobil",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver kobil_device = {
.driver = {
.owner = THIS_MODULE,
.name = "kobil",
},
.description = "KOBIL USB smart card terminal",
.id_table = id_table,
.num_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = 0,
.num_bulk_out = 0,
.num_ports = 1,
.attach = kobil_startup,
.shutdown = kobil_shutdown,
.ioctl = kobil_ioctl,
.tiocmget = kobil_tiocmget,
.tiocmset = kobil_tiocmset,
.open = kobil_open,
.close = kobil_close,
.write = kobil_write,
.write_room = kobil_write_room,
.read_int_callback = kobil_read_int_callback,
};
struct kobil_private {
int write_int_endpoint_address;
int read_int_endpoint_address;
unsigned char buf[KOBIL_BUF_LENGTH]; // buffer for the APDU to send
int filled; // index of the last char in buf
int cur_pos; // index of the next char to send in buf
__u16 device_type;
int line_state;
struct termios internal_termios;
};
static int kobil_startup (struct usb_serial *serial)
{
int i;
struct kobil_private *priv;
struct usb_device *pdev;
struct usb_host_config *actconfig;
struct usb_interface *interface;
struct usb_host_interface *altsetting;
struct usb_host_endpoint *endpoint;
priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
if (!priv){
return -ENOMEM;
}
priv->filled = 0;
priv->cur_pos = 0;
priv->device_type = le16_to_cpu(serial->dev->descriptor.idProduct);
priv->line_state = 0;
switch (priv->device_type){
case KOBIL_ADAPTER_B_PRODUCT_ID:
printk(KERN_DEBUG "KOBIL B1 PRO / KAAN PRO detected\n");
break;
case KOBIL_ADAPTER_K_PRODUCT_ID:
printk(KERN_DEBUG "KOBIL KAAN Standard Plus / SecOVID Reader Plus detected\n");
break;
case KOBIL_USBTWIN_PRODUCT_ID:
printk(KERN_DEBUG "KOBIL USBTWIN detected\n");
break;
case KOBIL_KAAN_SIM_PRODUCT_ID:
printk(KERN_DEBUG "KOBIL KAAN SIM detected\n");
break;
}
usb_set_serial_port_data(serial->port[0], priv);
// search for the necessary endpoints
pdev = serial->dev;
actconfig = pdev->actconfig;
interface = actconfig->interface[0];
altsetting = interface->cur_altsetting;
endpoint = altsetting->endpoint;
for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
endpoint = &altsetting->endpoint[i];
if (((endpoint->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
((endpoint->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
dbg("%s Found interrupt out endpoint. Address: %d", __FUNCTION__, endpoint->desc.bEndpointAddress);
priv->write_int_endpoint_address = endpoint->desc.bEndpointAddress;
}
if (((endpoint->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
((endpoint->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
dbg("%s Found interrupt in endpoint. Address: %d", __FUNCTION__, endpoint->desc.bEndpointAddress);
priv->read_int_endpoint_address = endpoint->desc.bEndpointAddress;
}
}
return 0;
}
static void kobil_shutdown (struct usb_serial *serial)
{
int i;
dbg("%s - port %d", __FUNCTION__, serial->port[0]->number);
for (i=0; i < serial->num_ports; ++i) {
while (serial->port[i]->open_count > 0) {
kobil_close (serial->port[i], NULL);
}
kfree(usb_get_serial_port_data(serial->port[i]));
usb_set_serial_port_data(serial->port[i], NULL);
}
}
static int kobil_open (struct usb_serial_port *port, struct file *filp)
{
int i, result = 0;
struct kobil_private *priv;
unsigned char *transfer_buffer;
int transfer_buffer_length = 8;
int write_urb_transfer_buffer_length = 8;
dbg("%s - port %d", __FUNCTION__, port->number);
priv = usb_get_serial_port_data(port);
priv->line_state = 0;
// someone sets the dev to 0 if the close method has been called
port->interrupt_in_urb->dev = port->serial->dev;
/* force low_latency on so that our tty_push actually forces
* the data through, otherwise it is scheduled, and with high
* data rates (like with OHCI) data can get lost.
*/
port->tty->low_latency = 1;
// without this, every push_tty_char is echoed :-(
port->tty->termios->c_lflag = 0;
port->tty->termios->c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN | XCASE);
port->tty->termios->c_iflag = IGNBRK | IGNPAR | IXOFF;
port->tty->termios->c_oflag &= ~ONLCR; // do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D)
// set up internal termios structure
priv->internal_termios.c_iflag = port->tty->termios->c_iflag;
priv->internal_termios.c_oflag = port->tty->termios->c_oflag;
priv->internal_termios.c_cflag = port->tty->termios->c_cflag;
priv->internal_termios.c_lflag = port->tty->termios->c_lflag;
for (i=0; i<NCCS; i++) {
priv->internal_termios.c_cc[i] = port->tty->termios->c_cc[i];
}
// allocate memory for transfer buffer
transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);
if (! transfer_buffer) {
return -ENOMEM;
} else {
memset(transfer_buffer, 0, transfer_buffer_length);
}
// allocate write_urb
if (!port->write_urb) {
dbg("%s - port %d Allocating port->write_urb", __FUNCTION__, port->number);
port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!port->write_urb) {
dbg("%s - port %d usb_alloc_urb failed", __FUNCTION__, port->number);
kfree(transfer_buffer);
return -ENOMEM;
}
}
// allocate memory for write_urb transfer buffer
port->write_urb->transfer_buffer = (unsigned char *) kmalloc(write_urb_transfer_buffer_length, GFP_KERNEL);
if (! port->write_urb->transfer_buffer) {
kfree(transfer_buffer);
usb_free_urb(port->write_urb);
port->write_urb = NULL;
return -ENOMEM;
}
// get hardware version
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_GetMisc,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
SUSBCR_MSC_GetHWVersion,
0,
transfer_buffer,
transfer_buffer_length,
KOBIL_TIMEOUT
);
dbg("%s - port %d Send get_HW_version URB returns: %i", __FUNCTION__, port->number, result);
dbg("Harware version: %i.%i.%i", transfer_buffer[0], transfer_buffer[1], transfer_buffer[2] );
// get firmware version
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_GetMisc,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
SUSBCR_MSC_GetFWVersion,
0,
transfer_buffer,
transfer_buffer_length,
KOBIL_TIMEOUT
);
dbg("%s - port %d Send get_FW_version URB returns: %i", __FUNCTION__, port->number, result);
dbg("Firmware version: %i.%i.%i", transfer_buffer[0], transfer_buffer[1], transfer_buffer[2] );
if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID || priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
// Setting Baudrate, Parity and Stopbits
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_SetBaudRateParityAndStopBits,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
SUSBCR_SBR_9600 | SUSBCR_SPASB_EvenParity | SUSBCR_SPASB_1StopBit,
0,
transfer_buffer,
0,
KOBIL_TIMEOUT
);
dbg("%s - port %d Send set_baudrate URB returns: %i", __FUNCTION__, port->number, result);
// reset all queues
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_Misc,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
SUSBCR_MSC_ResetAllQueues,
0,
transfer_buffer,
0,
KOBIL_TIMEOUT
);
dbg("%s - port %d Send reset_all_queues URB returns: %i", __FUNCTION__, port->number, result);
}
if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID || priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
// start reading (Adapter B 'cause PNP string)
result = usb_submit_urb( port->interrupt_in_urb, GFP_ATOMIC );
dbg("%s - port %d Send read URB returns: %i", __FUNCTION__, port->number, result);
}
kfree(transfer_buffer);
return 0;
}
static void kobil_close (struct usb_serial_port *port, struct file *filp)
{
dbg("%s - port %d", __FUNCTION__, port->number);
if (port->write_urb) {
usb_kill_urb(port->write_urb);
usb_free_urb( port->write_urb );
port->write_urb = NULL;
}
if (port->interrupt_in_urb)
usb_kill_urb(port->interrupt_in_urb);
}
static void kobil_read_int_callback( struct urb *purb, struct pt_regs *regs)
{
int result;
struct usb_serial_port *port = (struct usb_serial_port *) purb->context;
struct tty_struct *tty;
unsigned char *data = purb->transfer_buffer;
// char *dbg_data;
dbg("%s - port %d", __FUNCTION__, port->number);
if (purb->status) {
dbg("%s - port %d Read int status not zero: %d", __FUNCTION__, port->number, purb->status);
return;
}
tty = port->tty;
if (purb->actual_length) {
// BEGIN DEBUG
/*
dbg_data = (unsigned char *) kmalloc((3 * purb->actual_length + 10) * sizeof(char), GFP_KERNEL);
if (! dbg_data) {
return;
}
memset(dbg_data, 0, (3 * purb->actual_length + 10));
for (i = 0; i < purb->actual_length; i++) {
sprintf(dbg_data +3*i, "%02X ", data[i]);
}
dbg(" <-- %s", dbg_data );
kfree(dbg_data);
*/
// END DEBUG
tty_buffer_request_room(tty, purb->actual_length);
tty_insert_flip_string(tty, data, purb->actual_length);
tty_flip_buffer_push(tty);
}
// someone sets the dev to 0 if the close method has been called
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb( port->interrupt_in_urb, GFP_ATOMIC );
dbg("%s - port %d Send read URB returns: %i", __FUNCTION__, port->number, result);
}
static void kobil_write_callback( struct urb *purb, struct pt_regs *regs )
{
}
static int kobil_write (struct usb_serial_port *port,
const unsigned char *buf, int count)
{
int length = 0;
int result = 0;
int todo = 0;
struct kobil_private * priv;
if (count == 0) {
dbg("%s - port %d write request of 0 bytes", __FUNCTION__, port->number);
return 0;
}
priv = usb_get_serial_port_data(port);
if (count > (KOBIL_BUF_LENGTH - priv->filled)) {
dbg("%s - port %d Error: write request bigger than buffer size", __FUNCTION__, port->number);
return -ENOMEM;
}
// Copy data to buffer
memcpy (priv->buf + priv->filled, buf, count);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, priv->buf + priv->filled);
priv->filled = priv->filled + count;
// only send complete block. TWIN, KAAN SIM and adapter K use the same protocol.
if ( ((priv->device_type != KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 2) && (priv->filled >= (priv->buf[1] + 3))) ||
((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 3) && (priv->filled >= (priv->buf[2] + 4))) ) {
// stop reading (except TWIN and KAAN SIM)
if ( (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) )
usb_kill_urb(port->interrupt_in_urb);
todo = priv->filled - priv->cur_pos;
while(todo > 0) {
// max 8 byte in one urb (endpoint size)
length = (todo < 8) ? todo : 8;
// copy data to transfer buffer
memcpy(port->write_urb->transfer_buffer, priv->buf + priv->cur_pos, length );
usb_fill_int_urb( port->write_urb,
port->serial->dev,
usb_sndintpipe(port->serial->dev, priv->write_int_endpoint_address),
port->write_urb->transfer_buffer,
length,
kobil_write_callback,
port,
8
);
priv->cur_pos = priv->cur_pos + length;
result = usb_submit_urb( port->write_urb, GFP_NOIO );
dbg("%s - port %d Send write URB returns: %i", __FUNCTION__, port->number, result);
todo = priv->filled - priv->cur_pos;
if (todo > 0) {
msleep(24);
}
} // end while
priv->filled = 0;
priv->cur_pos = 0;
// someone sets the dev to 0 if the close method has been called
port->interrupt_in_urb->dev = port->serial->dev;
// start reading (except TWIN and KAAN SIM)
if ( (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) ) {
// someone sets the dev to 0 if the close method has been called
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb( port->interrupt_in_urb, GFP_NOIO );
dbg("%s - port %d Send read URB returns: %i", __FUNCTION__, port->number, result);
}
}
return count;
}
static int kobil_write_room (struct usb_serial_port *port)
{
//dbg("%s - port %d", __FUNCTION__, port->number);
return 8;
}
static int kobil_tiocmget(struct usb_serial_port *port, struct file *file)
{
struct kobil_private * priv;
int result;
unsigned char *transfer_buffer;
int transfer_buffer_length = 8;
priv = usb_get_serial_port_data(port);
if ((priv->device_type == KOBIL_USBTWIN_PRODUCT_ID) || (priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)) {
// This device doesn't support ioctl calls
return -EINVAL;
}
// allocate memory for transfer buffer
transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);
if (!transfer_buffer) {
return -ENOMEM;
}
memset(transfer_buffer, 0, transfer_buffer_length);
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_GetStatusLineState,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
0,
0,
transfer_buffer,
transfer_buffer_length,
KOBIL_TIMEOUT);
dbg("%s - port %d Send get_status_line_state URB returns: %i. Statusline: %02x",
__FUNCTION__, port->number, result, transfer_buffer[0]);
if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0) {
priv->line_state |= TIOCM_DSR;
} else {
priv->line_state &= ~TIOCM_DSR;
}
kfree(transfer_buffer);
return priv->line_state;
}
static int kobil_tiocmset(struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct kobil_private * priv;
int result;
int dtr = 0;
int rts = 0;
unsigned char *transfer_buffer;
int transfer_buffer_length = 8;
priv = usb_get_serial_port_data(port);
if ((priv->device_type == KOBIL_USBTWIN_PRODUCT_ID) || (priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)) {
// This device doesn't support ioctl calls
return -EINVAL;
}
// allocate memory for transfer buffer
transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);
if (! transfer_buffer) {
return -ENOMEM;
}
memset(transfer_buffer, 0, transfer_buffer_length);
if (set & TIOCM_RTS)
rts = 1;
if (set & TIOCM_DTR)
dtr = 1;
if (clear & TIOCM_RTS)
rts = 0;
if (clear & TIOCM_DTR)
dtr = 0;
if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) {
if (dtr != 0)
dbg("%s - port %d Setting DTR", __FUNCTION__, port->number);
else
dbg("%s - port %d Clearing DTR", __FUNCTION__, port->number);
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_SetStatusLinesOrQueues,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
((dtr != 0) ? SUSBCR_SSL_SETDTR : SUSBCR_SSL_CLRDTR),
0,
transfer_buffer,
0,
KOBIL_TIMEOUT);
} else {
if (rts != 0)
dbg("%s - port %d Setting RTS", __FUNCTION__, port->number);
else
dbg("%s - port %d Clearing RTS", __FUNCTION__, port->number);
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_SetStatusLinesOrQueues,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
((rts != 0) ? SUSBCR_SSL_SETRTS : SUSBCR_SSL_CLRRTS),
0,
transfer_buffer,
0,
KOBIL_TIMEOUT);
}
dbg("%s - port %d Send set_status_line URB returns: %i", __FUNCTION__, port->number, result);
kfree(transfer_buffer);
return (result < 0) ? result : 0;
}
static int kobil_ioctl(struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct kobil_private * priv;
int result;
unsigned short urb_val = 0;
unsigned char *transfer_buffer;
int transfer_buffer_length = 8;
char *settings;
void __user *user_arg = (void __user *)arg;
priv = usb_get_serial_port_data(port);
if ((priv->device_type == KOBIL_USBTWIN_PRODUCT_ID) || (priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)) {
// This device doesn't support ioctl calls
return 0;
}
switch (cmd) {
case TCGETS: // 0x5401
if (!access_ok(VERIFY_WRITE, user_arg, sizeof(struct termios))) {
dbg("%s - port %d Error in access_ok", __FUNCTION__, port->number);
return -EFAULT;
}
if (kernel_termios_to_user_termios((struct termios __user *)arg,
&priv->internal_termios))
return -EFAULT;
return 0;
case TCSETS: // 0x5402
if (!(port->tty->termios)) {
dbg("%s - port %d Error: port->tty->termios is NULL", __FUNCTION__, port->number);
return -ENOTTY;
}
if (!access_ok(VERIFY_READ, user_arg, sizeof(struct termios))) {
dbg("%s - port %d Error in access_ok", __FUNCTION__, port->number);
return -EFAULT;
}
if (user_termios_to_kernel_termios(&priv->internal_termios,
(struct termios __user *)arg))
return -EFAULT;
settings = (unsigned char *) kmalloc(50, GFP_KERNEL);
if (! settings) {
return -ENOBUFS;
}
memset(settings, 0, 50);
switch (priv->internal_termios.c_cflag & CBAUD) {
case B1200:
urb_val = SUSBCR_SBR_1200;
strcat(settings, "1200 ");
break;
case B9600:
default:
urb_val = SUSBCR_SBR_9600;
strcat(settings, "9600 ");
break;
}
urb_val |= (priv->internal_termios.c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits : SUSBCR_SPASB_1StopBit;
strcat(settings, (priv->internal_termios.c_cflag & CSTOPB) ? "2 StopBits " : "1 StopBit ");
if (priv->internal_termios.c_cflag & PARENB) {
if (priv->internal_termios.c_cflag & PARODD) {
urb_val |= SUSBCR_SPASB_OddParity;
strcat(settings, "Odd Parity");
} else {
urb_val |= SUSBCR_SPASB_EvenParity;
strcat(settings, "Even Parity");
}
} else {
urb_val |= SUSBCR_SPASB_NoParity;
strcat(settings, "No Parity");
}
dbg("%s - port %d setting port to: %s", __FUNCTION__, port->number, settings );
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_SetBaudRateParityAndStopBits,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
urb_val,
0,
settings,
0,
KOBIL_TIMEOUT
);
dbg("%s - port %d Send set_baudrate URB returns: %i", __FUNCTION__, port->number, result);
kfree(settings);
return 0;
case TCFLSH: // 0x540B
transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);
if (! transfer_buffer) {
return -ENOBUFS;
}
result = usb_control_msg( port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0 ),
SUSBCRequest_Misc,
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
SUSBCR_MSC_ResetAllQueues,
0,
NULL,//transfer_buffer,
0,
KOBIL_TIMEOUT
);
dbg("%s - port %d Send reset_all_queues (FLUSH) URB returns: %i", __FUNCTION__, port->number, result);
kfree(transfer_buffer);
return ((result < 0) ? -EFAULT : 0);
}
return -ENOIOCTLCMD;
}
static int __init kobil_init (void)
{
int retval;
retval = usb_serial_register(&kobil_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&kobil_driver);
if (retval)
goto failed_usb_register;
info(DRIVER_VERSION " " DRIVER_AUTHOR);
info(DRIVER_DESC);
return 0;
failed_usb_register:
usb_serial_deregister(&kobil_device);
failed_usb_serial_register:
return retval;
}
static void __exit kobil_exit (void)
{
usb_deregister (&kobil_driver);
usb_serial_deregister (&kobil_device);
}
module_init(kobil_init);
module_exit(kobil_exit);
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE( "GPL" );
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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