/*
* This code was developed for the Quatech USB line for linux, it used
* much of the code developed by Greg Kroah-Hartman for USB serial devices
*
*/
#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/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
static int debug;
/* Version Information */
#define DRIVER_VERSION "v2.14"
#define DRIVER_AUTHOR "Tim Gobeli, Quatech, Inc"
#define DRIVER_DESC "Quatech USB to Serial Driver"
#define USB_VENDOR_ID_QUATECH 0x061d /* Quatech VID */
#define QUATECH_SSU100 0xC020 /* SSU100 */
#define QUATECH_SSU200 0xC030 /* SSU200 */
#define QUATECH_DSU100 0xC040 /* DSU100 */
#define QUATECH_DSU200 0xC050 /* DSU200 */
#define QUATECH_QSU100 0xC060 /* QSU100 */
#define QUATECH_QSU200 0xC070 /* QSU200 */
#define QUATECH_ESU100A 0xC080 /* ESU100A */
#define QUATECH_ESU100B 0xC081 /* ESU100B */
#define QUATECH_ESU200A 0xC0A0 /* ESU200A */
#define QUATECH_ESU200B 0xC0A1 /* ESU200B */
#define QUATECH_HSU100A 0xC090 /* HSU100A */
#define QUATECH_HSU100B 0xC091 /* HSU100B */
#define QUATECH_HSU100C 0xC092 /* HSU100C */
#define QUATECH_HSU100D 0xC093 /* HSU100D */
#define QUATECH_HSU200A 0xC0B0 /* HSU200A */
#define QUATECH_HSU200B 0xC0B1 /* HSU200B */
#define QUATECH_HSU200C 0xC0B2 /* HSU200C */
#define QUATECH_HSU200D 0xC0B3 /* HSU200D */
#define QUATECH_SSU100_2 0xC120 /* SSU100_2 */
#define QUATECH_DSU100_2 0xC140 /* DSU100_2 */
#define QUATECH_DSU400_2 0xC150 /* DSU400_2 */
#define QUATECH_QSU100_2 0xC160 /* QSU100_2 */
#define QUATECH_QSU400_2 0xC170 /* QSU400_2 */
#define QUATECH_ESU400_2 0xC180 /* ESU400_2 */
#define QUATECH_ESU100_2 0xC1A0 /* ESU100_2 */
#define QT_SET_GET_DEVICE 0xc2
#define QT_OPEN_CLOSE_CHANNEL 0xca
#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
#define QT_SET_ATF 0xcd
#define QT_GET_SET_REGISTER 0xc0
#define QT_GET_SET_UART 0xc1
#define QT_HW_FLOW_CONTROL_MASK 0xc5
#define QT_SW_FLOW_CONTROL_MASK 0xc6
#define QT_SW_FLOW_CONTROL_DISABLE 0xc7
#define QT_BREAK_CONTROL 0xc8
#define USBD_TRANSFER_DIRECTION_IN 0xc0
#define USBD_TRANSFER_DIRECTION_OUT 0x40
#define MAX_BAUD_RATE 460800
#define MAX_BAUD_REMAINDER 4608
#define DIV_LATCH_LS 0x00
#define XMT_HOLD_REGISTER 0x00
#define XVR_BUFFER_REGISTER 0x00
#define DIV_LATCH_MS 0x01
#define FIFO_CONTROL_REGISTER 0x02
#define LINE_CONTROL_REGISTER 0x03
#define MODEM_CONTROL_REGISTER 0x04
#define LINE_STATUS_REGISTER 0x05
#define MODEM_STATUS_REGISTER 0x06
#define SERIAL_MCR_DTR 0x01
#define SERIAL_MCR_RTS 0x02
#define SERIAL_MCR_LOOP 0x10
#define SERIAL_MSR_CTS 0x10
#define SERIAL_MSR_CD 0x80
#define SERIAL_MSR_RI 0x40
#define SERIAL_MSR_DSR 0x20
#define SERIAL_MSR_MASK 0xf0
#define SERIAL_8_DATA 0x03
#define SERIAL_7_DATA 0x02
#define SERIAL_6_DATA 0x01
#define SERIAL_5_DATA 0x00
#define SERIAL_ODD_PARITY 0X08
#define SERIAL_EVEN_PARITY 0X18
#define SERIAL_TWO_STOPB 0x04
#define SERIAL_ONE_STOPB 0x00
#define DEFAULT_DIVISOR 0x30 /* gives 9600 baud rate */
#define DEFAULT_LCR SERIAL_8_DATA /* 8, none , 1 */
#define FULLPWRBIT 0x00000080
#define NEXT_BOARD_POWER_BIT 0x00000004
#define SERIAL_LSR_OE 0x02
#define SERIAL_LSR_PE 0x04
#define SERIAL_LSR_FE 0x08
#define SERIAL_LSR_BI 0x10
#define SERIAL_MSR_CTS 0x10
#define SERIAL_MSR_CD 0x80
#define SERIAL_MSR_RI 0x40
#define SERIAL_MSR_DSR 0x20
#define SERIAL_MSR_MASK 0xf0
#define PREFUFF_LEVEL_CONSERVATIVE 128
#define ATC_DISABLED 0x0
#define RR_BITS 0x03 /* for clearing clock bits */
#define DUPMODE_BITS 0xc0
#define CLKS_X4 0x02
#define LOOPMODE_BITS 0x41 /* LOOP1 = b6, LOOP0 = b0 (PORT B) */
#define ALL_LOOPBACK 0x01
#define MODEM_CTRL 0x40
#define RS232_MODE 0x00
static struct usb_device_id serqt_id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU200)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU200)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU200)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU100A)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU100B)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU200A)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU200B)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100A)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100B)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100C)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100D)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200A)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200B)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200C)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200D)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100_2)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU100_2)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU400_2)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU100_2)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU400_2)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU400_2)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU100_2)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, serqt_id_table);
struct qt_get_device_data {
__u8 porta;
__u8 portb;
__u8 portc;
};
struct qt_open_channel_data {
__u8 line_status;
__u8 modem_status;
};
struct quatech_port {
int port_num; /* number of the port */
struct urb *write_urb; /* write URB for this port */
struct urb *read_urb; /* read URB for this port */
struct urb *int_urb;
__u8 shadowLCR; /* last LCR value received */
__u8 shadowMCR; /* last MCR value received */
__u8 shadowMSR; /* last MSR value received */
__u8 shadowLSR; /* last LSR value received */
char open_ports;
/* Used for TIOCMIWAIT */
wait_queue_head_t msr_wait;
char prev_status, diff_status;
wait_queue_head_t wait;
struct async_icount icount;
struct usb_serial_port *port; /* owner of this object */
struct qt_get_device_data DeviceData;
spinlock_t lock;
bool read_urb_busy;
int RxHolding;
int ReadBulkStopped;
char closePending;
};
static struct usb_driver serqt_usb_driver = {
.name = "quatech-usb-serial",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = serqt_id_table,
.no_dynamic_id = 1,
};
static int port_paranoia_check(struct usb_serial_port *port,
const char *function)
{
if (!port) {
dbg("%s - port == NULL", function);
return -1;
}
if (!port->serial) {
dbg("%s - port->serial == NULL\n", function);
return -1;
}
return 0;
}
static int serial_paranoia_check(struct usb_serial *serial,
const char *function)
{
if (!serial) {
dbg("%s - serial == NULL\n", function);
return -1;
}
if (!serial->type) {
dbg("%s - serial->type == NULL!", function);
return -1;
}
return 0;
}
static inline struct quatech_port *qt_get_port_private(struct usb_serial_port
*port)
{
return (struct quatech_port *)usb_get_serial_port_data(port);
}
static inline void qt_set_port_private(struct usb_serial_port *port,
struct quatech_port *data)
{
usb_set_serial_port_data(port, (void *)data);
}
static struct usb_serial *get_usb_serial(struct usb_serial_port *port,
const char *function)
{
/* if no port was specified, or it fails a paranoia check */
if (!port ||
port_paranoia_check(port, function) ||
serial_paranoia_check(port->serial, function)) {
/*
* then say that we dont have a valid usb_serial thing,
* which will end up genrating -ENODEV return values
*/
return NULL;
}
return port->serial;
}
static void ProcessLineStatus(struct quatech_port *qt_port,
unsigned char line_status)
{
qt_port->shadowLSR =
line_status & (SERIAL_LSR_OE | SERIAL_LSR_PE | SERIAL_LSR_FE |
SERIAL_LSR_BI);
return;
}
static void ProcessModemStatus(struct quatech_port *qt_port,
unsigned char modem_status)
{
qt_port->shadowMSR = modem_status;
wake_up_interruptible(&qt_port->wait);
return;
}
static void ProcessRxChar(struct tty_struct *tty, struct usb_serial_port *port,
unsigned char data)
{
struct urb *urb = port->read_urb;
if (urb->actual_length)
tty_insert_flip_char(tty, data, TTY_NORMAL);
}
static void qt_write_bulk_callback(struct urb *urb)
{
struct tty_struct *tty;
int status;
struct quatech_port *quatech_port;
status = urb->status;
if (status) {
dbg("nonzero write bulk status received:%d\n", status);
return;
}
quatech_port = urb->context;
dbg("%s - port %d\n", __func__, quatech_port->port_num);
tty = tty_port_tty_get(&quatech_port->port->port);
if (tty)
tty_wakeup(tty);
tty_kref_put(tty);
}
static void qt_interrupt_callback(struct urb *urb)
{
/* FIXME */
}
static void qt_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct usb_serial *serial = get_usb_serial(port, __func__);
struct quatech_port *qt_port = qt_get_port_private(port);
unsigned char *data;
struct tty_struct *tty;
unsigned int index;
unsigned int RxCount;
int i, result;
int flag, flag_data;
if (urb->status) {
qt_port->ReadBulkStopped = 1;
dbg("%s - nonzero write bulk status received: %d\n",
__func__, urb->status);
return;
}
tty = tty_port_tty_get(&port->port);
if (!tty) {
dbg("%s - bad tty pointer - exiting", __func__);
return;
}
data = urb->transfer_buffer;
RxCount = urb->actual_length;
/* index = MINOR(port->tty->device) - serial->minor; */
index = tty->index - serial->minor;
dbg("%s - port %d\n", __func__, port->number);
dbg("%s - port->RxHolding = %d\n", __func__, qt_port->RxHolding);
if (port_paranoia_check(port, __func__) != 0) {
dbg("%s - port_paranoia_check, exiting\n", __func__);
qt_port->ReadBulkStopped = 1;
goto exit;
}
if (!serial) {
dbg("%s - bad serial pointer, exiting\n", __func__);
goto exit;
}
if (qt_port->closePending == 1) {
/* Were closing , stop reading */
dbg("%s - (qt_port->closepending == 1\n", __func__);
qt_port->ReadBulkStopped = 1;
goto exit;
}
/*
* RxHolding is asserted by throttle, if we assert it, we're not
* receiving any more characters and let the box handle the flow
* control
*/
if (qt_port->RxHolding == 1) {
qt_port->ReadBulkStopped = 1;
goto exit;
}
if (urb->status) {
qt_port->ReadBulkStopped = 1;
dbg("%s - nonzero read bulk status received: %d\n",
__func__, urb->status);
goto exit;
}
if (tty && RxCount) {
flag_data = 0;
for (i = 0; i < RxCount; ++i) {
/* Look ahead code here */
if ((i <= (RxCount - 3)) && (data[i] == 0x1b)
&& (data[i + 1] == 0x1b)) {
flag = 0;
switch (data[i + 2]) {
case 0x00:
/* line status change 4th byte must follow */
if (i > (RxCount - 4)) {
dbg("Illegal escape seuences in received data\n");
break;
}
ProcessLineStatus(qt_port, data[i + 3]);
i += 3;
flag = 1;
break;
case 0x01:
/* Modem status status change 4th byte must follow */
dbg("Modem status status. \n");
if (i > (RxCount - 4)) {
dbg("Illegal escape sequences in received data\n");
break;
}
ProcessModemStatus(qt_port,
data[i + 3]);
i += 3;
flag = 1;
break;
case 0xff:
dbg("No status sequence. \n");
if (tty) {
ProcessRxChar(tty, port, data[i]);
ProcessRxChar(tty, port, data[i + 1]);
}
i += 2;
break;
}
if (flag == 1)
continue;
}
if (tty && urb->actual_length)
tty_insert_flip_char(tty, data[i], TTY_NORMAL);
}
tty_flip_buffer_push(tty);
}
/* Continue trying to always read */
usb_fill_bulk_urb(port->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
qt_read_bulk_callback, port);
result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (result)
dbg("%s - failed resubmitting read urb, error %d",
__func__, result);
else {
if (tty && RxCount) {
tty_flip_buffer_push(tty);
tty_schedule_flip(tty);
}
}
schedule_work(&port->work);
exit:
tty_kref_put(tty);
}
/*
* qt_get_device
* Issue a GET_DEVICE vendor-specific request on the default control pipe If
* successful, fills in the qt_get_device_data structure pointed to by
* device_data, otherwise return a negative error number of the problem.
*/
static int qt_get_device(struct usb_serial *serial,
struct qt_get_device_data *device_data)
{
int result;
unsigned char *transfer_buffer;
transfer_buffer =
kmalloc(sizeof(struct qt_get_device_data), GFP_KERNEL);
if (!transfer_buffer)
return -ENOMEM;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
QT_SET_GET_DEVICE, 0xc0, 0, 0,
transfer_buffer,
sizeof(struct qt_get_device_data), 300);
if (result > 0)
memcpy(device_data, transfer_buffer,
sizeof(struct qt_get_device_data));
kfree(transfer_buffer);
return result;
}
/****************************************************************************
* BoxSetPrebufferLevel
TELLS BOX WHEN TO ASSERT FLOW CONTROL
****************************************************************************/
static int BoxSetPrebufferLevel(struct usb_serial *serial)
{
int result;
__u16 buffer_length;
buffer_length = PREFUFF_LEVEL_CONSERVATIVE;
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_GET_SET_PREBUF_TRIG_LVL, 0x40,
buffer_length, 0, NULL, 0, 300);
return result;
}
/****************************************************************************
* BoxSetATC
TELLS BOX WHEN TO ASSERT automatic transmitter control
****************************************************************************/
static int BoxSetATC(struct usb_serial *serial, __u16 n_Mode)
{
int result;
__u16 buffer_length;
buffer_length = PREFUFF_LEVEL_CONSERVATIVE;
result =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_SET_ATF, 0x40, n_Mode, 0, NULL, 0, 300);
return result;
}
/**
* qt_set_device
* Issue a SET_DEVICE vendor-specific request on the default control pipe If
* successful returns the number of bytes written, otherwise it returns a
* negative error number of the problem.
*/
static int qt_set_device(struct usb_serial *serial,
struct qt_get_device_data *device_data)
{
int result;
__u16 length;
__u16 PortSettings;
PortSettings = ((__u16) (device_data->portb));
PortSettings = (PortSettings << 8);
PortSettings += ((__u16) (device_data->porta));
length = sizeof(struct qt_get_device_data);
dbg("%s - PortSettings = 0x%x\n", __func__, PortSettings);
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_SET_GET_DEVICE, 0x40, PortSettings,
0, NULL, 0, 300);
return result;
}
static int qt_open_channel(struct usb_serial *serial, __u16 Uart_Number,
struct qt_open_channel_data *pDeviceData)
{
int result;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
QT_OPEN_CLOSE_CHANNEL,
USBD_TRANSFER_DIRECTION_IN, 1, Uart_Number,
pDeviceData,
sizeof(struct qt_open_channel_data), 300);
return result;
}
static int qt_close_channel(struct usb_serial *serial, __u16 Uart_Number)
{
int result;
result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
QT_OPEN_CLOSE_CHANNEL,
USBD_TRANSFER_DIRECTION_OUT, 0, Uart_Number,
NULL, 0, 300);
return result;
}
/****************************************************************************
* BoxGetRegister
* issuse a GET_REGISTER vendor-spcific request on the default control pipe
* If successful, fills in the pValue with the register value asked for
****************************************************************************/
static int BoxGetRegister(struct usb_serial *serial, unsigned short Uart_Number,
unsigned short Register_Num, __u8 *pValue)
{
int result;
__u16 current_length;
current_length = sizeof(struct qt_get_device_data);
result =
usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
QT_GET_SET_REGISTER, 0xC0, Register_Num,
Uart_Number, (void *)pValue, sizeof(*pValue), 300);
return result;
}
/****************************************************************************
* BoxSetRegister
* issuse a GET_REGISTER vendor-spcific request on the default control pipe
* If successful, fills in the pValue with the register value asked for
****************************************************************************/
static int BoxSetRegister(struct usb_serial *serial, unsigned short Uart_Number,
unsigned short Register_Num, unsigned short Value)
{
int result;
unsigned short RegAndByte;
RegAndByte = Value;
RegAndByte = RegAndByte << 8;
RegAndByte = RegAndByte + Register_Num;
/*
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_GET_SET_REGISTER, 0xC0, Register_Num,
Uart_Number, NULL, 0, 300);
*/
result =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_GET_SET_REGISTER, 0x40, RegAndByte, Uart_Number,
NULL, 0, 300);
return result;
}
/*
* qt_setuart
* issuse a SET_UART vendor-spcific request on the default control pipe
* If successful sets baud rate divisor and LCR value
*/
static int qt_setuart(struct usb_serial *serial, unsigned short Uart_Number,
unsigned short default_divisor, unsigned char default_LCR)
{
int result;
unsigned short UartNumandLCR;
UartNumandLCR = (default_LCR << 8) + Uart_Number;
result =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_GET_SET_UART, 0x40, default_divisor,
UartNumandLCR, NULL, 0, 300);
return result;
}
static int BoxSetHW_FlowCtrl(struct usb_serial *serial, unsigned int index,
int bSet)
{
__u8 mcr = 0;
__u8 msr = 0, MOUT_Value = 0;
unsigned int status;
if (bSet == 1) {
/* flow control, box will clear RTS line to prevent remote */
mcr = SERIAL_MCR_RTS;
} /* device from xmitting more chars */
else {
/* no flow control to remote device */
mcr = 0;
}
MOUT_Value = mcr << 8;
if (bSet == 1) {
/* flow control, box will inhibit xmit data if CTS line is
* asserted */
msr = SERIAL_MSR_CTS;
} else {
/* Box will not inhimbe xmit data due to CTS line */
msr = 0;
}
MOUT_Value |= msr;
status =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_HW_FLOW_CONTROL_MASK, 0x40, MOUT_Value,
index, NULL, 0, 300);
return status;
}
static int BoxSetSW_FlowCtrl(struct usb_serial *serial, __u16 index,
unsigned char stop_char, unsigned char start_char)
{
__u16 nSWflowout;
int result;
nSWflowout = start_char << 8;
nSWflowout = (unsigned short)stop_char;
result =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_SW_FLOW_CONTROL_MASK, 0x40, nSWflowout,
index, NULL, 0, 300);
return result;
}
static int BoxDisable_SW_FlowCtrl(struct usb_serial *serial, __u16 index)
{
int result;
result =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_SW_FLOW_CONTROL_DISABLE, 0x40, 0, index,
NULL, 0, 300);
return result;
}
static int qt_startup(struct usb_serial *serial)
{
struct usb_serial_port *port;
struct quatech_port *qt_port;
struct qt_get_device_data DeviceData;
int i;
int status;
dbg("enterting %s", __func__);
/* Now setup per port private data */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
qt_port = kzalloc(sizeof(*qt_port), GFP_KERNEL);
if (!qt_port) {
dbg("%s: kmalloc for quatech_port (%d) failed!.",
__func__, i);
for(--i; i >= 0; i--) {
port = serial->port[i];
kfree(usb_get_serial_port_data(port));
usb_set_serial_port_data(port, NULL);
}
return -ENOMEM;
}
spin_lock_init(&qt_port->lock);
usb_set_serial_port_data(port, qt_port);
}
status = qt_get_device(serial, &DeviceData);
if (status < 0) {
dbg(__FILE__ "box_get_device failed");
goto startup_error;
}
dbg(__FILE__ "DeviceData.portb = 0x%x", DeviceData.portb);
DeviceData.portb &= ~FULLPWRBIT;
dbg(__FILE__ "Changing DeviceData.portb to 0x%x", DeviceData.portb);
status = qt_set_device(serial, &DeviceData);
if (status < 0) {
dbg(__FILE__ "qt_set_device failed\n");
goto startup_error;
}
status = qt_get_device(serial, &DeviceData);
if (status < 0) {
dbg(__FILE__ "qt_get_device failed");
goto startup_error;
}
switch (serial->dev->descriptor.idProduct) {
case QUATECH_SSU100:
case QUATECH_DSU100:
case QUATECH_QSU100:
case QUATECH_ESU100A:
case QUATECH_ESU100B:
case QUATECH_HSU100A:
case QUATECH_HSU100B:
case QUATECH_HSU100C:
case QUATECH_HSU100D:
DeviceData.porta &= ~(RR_BITS | DUPMODE_BITS);
DeviceData.porta |= CLKS_X4;
DeviceData.portb &= ~(LOOPMODE_BITS);
DeviceData.portb |= RS232_MODE;
break;
case QUATECH_SSU200:
case QUATECH_DSU200:
case QUATECH_QSU200:
case QUATECH_ESU200A:
case QUATECH_ESU200B:
case QUATECH_HSU200A:
case QUATECH_HSU200B:
case QUATECH_HSU200C:
case QUATECH_HSU200D:
DeviceData.porta &= ~(RR_BITS | DUPMODE_BITS);
DeviceData.porta |= CLKS_X4;
DeviceData.portb &= ~(LOOPMODE_BITS);
DeviceData.portb |= ALL_LOOPBACK;
break;
default:
DeviceData.porta &= ~(RR_BITS | DUPMODE_BITS);
DeviceData.porta |= CLKS_X4;
DeviceData.portb &= ~(LOOPMODE_BITS);
DeviceData.portb |= RS232_MODE;
break;
}
status = BoxSetPrebufferLevel(serial); /* sets to default value */
if (status < 0) {
dbg(__FILE__ "BoxSetPrebufferLevel failed\n");
goto startup_error;
}
status = BoxSetATC(serial, ATC_DISABLED);
if (status < 0) {
dbg(__FILE__ "BoxSetATC failed\n");
goto startup_error;
}
dbg(__FILE__ "DeviceData.portb = 0x%x", DeviceData.portb);
DeviceData.portb |= NEXT_BOARD_POWER_BIT;
dbg(__FILE__ "Changing DeviceData.portb to 0x%x", DeviceData.portb);
status = qt_set_device(serial, &DeviceData);
if (status < 0) {
dbg(__FILE__ "qt_set_device failed\n");
goto startup_error;
}
dbg("Exit Success %s\n", __func__);
return 0;
startup_error:
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
qt_port = qt_get_port_private(port);
kfree(qt_port);
usb_set_serial_port_data(port, NULL);
}
dbg("Exit fail %s\n", __func__);
return -EIO;
}
static void qt_release(struct usb_serial *serial)
{
struct usb_serial_port *port;
struct quatech_port *qt_port;
int i;
dbg("enterting %s", __func__);
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
if (!port)
continue;
qt_port = usb_get_serial_port_data(port);
kfree(qt_port);
usb_set_serial_port_data(port, NULL);
}
}
static int qt_open(struct tty_struct *tty,
struct usb_serial_port *port)
{
struct usb_serial *serial;
struct quatech_port *quatech_port;
struct quatech_port *port0;
struct qt_open_channel_data ChannelData;
int result;
if (port_paranoia_check(port, __func__))
return -ENODEV;
dbg("%s - port %d\n", __func__, port->number);
serial = port->serial;
if (serial_paranoia_check(serial, __func__))
return -ENODEV;
quatech_port = qt_get_port_private(port);
port0 = qt_get_port_private(serial->port[0]);
if (quatech_port == NULL || port0 == NULL)
return -ENODEV;
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
port0->open_ports++;
result = qt_get_device(serial, &port0->DeviceData);
/* Port specific setups */
result = qt_open_channel(serial, port->number, &ChannelData);
if (result < 0) {
dbg(__FILE__ "qt_open_channel failed\n");
return result;
}
dbg(__FILE__ "qt_open_channel completed.\n");
/* FIXME: are these needed? Does it even do anything useful? */
quatech_port->shadowLSR = ChannelData.line_status &
(SERIAL_LSR_OE | SERIAL_LSR_PE | SERIAL_LSR_FE | SERIAL_LSR_BI);
quatech_port->shadowMSR = ChannelData.modem_status &
(SERIAL_MSR_CTS | SERIAL_MSR_DSR | SERIAL_MSR_RI | SERIAL_MSR_CD);
/* Set Baud rate to default and turn off (default)flow control here */
result = qt_setuart(serial, port->number, DEFAULT_DIVISOR, DEFAULT_LCR);
if (result < 0) {
dbg(__FILE__ "qt_setuart failed\n");
return result;
}
dbg(__FILE__ "qt_setuart completed.\n");
/*
* Put this here to make it responsive to stty and defaults set by
* the tty layer
*/
/* FIXME: is this needed? */
/* qt_set_termios(tty, port, NULL); */
/* Check to see if we've set up our endpoint info yet */
if (port0->open_ports == 1) {
if (serial->port[0]->interrupt_in_buffer == NULL) {
/* set up interrupt urb */
usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
serial->dev,
usb_rcvintpipe(serial->dev,
serial->port[0]->interrupt_in_endpointAddress),
serial->port[0]->interrupt_in_buffer,
serial->port[0]->
interrupt_in_urb->transfer_buffer_length,
qt_interrupt_callback, serial,
serial->port[0]->
interrupt_in_urb->interval);
result =
usb_submit_urb(serial->port[0]->interrupt_in_urb,
GFP_KERNEL);
if (result) {
dev_err(&port->dev,
"%s - Error %d submitting "
"interrupt urb\n", __func__, result);
}
}
}
dbg("port number is %d \n", port->number);
dbg("serial number is %d \n", port->serial->minor);
dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
dbg("port's number in the device is %d\n", quatech_port->port_num);
quatech_port->read_urb = port->read_urb;
/* set up our bulk in urb */
usb_fill_bulk_urb(quatech_port->read_urb,
serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_in_endpointAddress),
port->bulk_in_buffer,
quatech_port->read_urb->transfer_buffer_length,
qt_read_bulk_callback, quatech_port);
dbg("qt_open: bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
quatech_port->read_urb_busy = true;
result = usb_submit_urb(quatech_port->read_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev,
"%s - Error %d submitting control urb\n",
__func__, result);
quatech_port->read_urb_busy = false;
}
/* initialize our wait queues */
init_waitqueue_head(&quatech_port->wait);
init_waitqueue_head(&quatech_port->msr_wait);
/* initialize our icount structure */
memset(&(quatech_port->icount), 0x00, sizeof(quatech_port->icount));
return 0;
}
static int qt_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial;
int chars = 0;
serial = get_usb_serial(port, __func__);
dbg("%s - port %d\n", __func__, port->number);
if (serial->num_bulk_out) {
if (port->write_urb->status == -EINPROGRESS)
chars = port->write_urb->transfer_buffer_length;
}
dbg("%s - returns %d\n", __func__, chars);
return chars;
}
static void qt_block_until_empty(struct tty_struct *tty,
struct quatech_port *qt_port)
{
int timeout = HZ / 10;
int wait = 30;
int count;
while (1) {
count = qt_chars_in_buffer(tty);
if (count <= 0)
return;
interruptible_sleep_on_timeout(&qt_port->wait, timeout);
wait--;
if (wait == 0) {
dbg("%s - TIMEOUT", __func__);
return;
} else {
wait = 30;
}
}
}
static void qt_close(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct quatech_port *qt_port;
struct quatech_port *port0;
struct tty_struct *tty;
int status;
unsigned int index;
status = 0;
dbg("%s - port %d\n", __func__, port->number);
tty = tty_port_tty_get(&port->port);
index = tty->index - serial->minor;
qt_port = qt_get_port_private(port);
port0 = qt_get_port_private(serial->port[0]);
/* shutdown any bulk reads that might be going on */
if (serial->num_bulk_out)
usb_unlink_urb(port->write_urb);
if (serial->num_bulk_in)
usb_unlink_urb(port->read_urb);
/* wait up to for transmitter to empty */
if (serial->dev)
qt_block_until_empty(tty, qt_port);
tty_kref_put(tty);
/* Close uart channel */
status = qt_close_channel(serial, index);
if (status < 0)
dbg("%s - port %d qt_close_channel failed.\n",
__func__, port->number);
port0->open_ports--;
dbg("qt_num_open_ports in close%d:in port%d\n",
port0->open_ports, port->number);
if (port0->open_ports == 0) {
if (serial->port[0]->interrupt_in_urb) {
dbg("%s", "Shutdown interrupt_in_urb\n");
usb_kill_urb(serial->port[0]->interrupt_in_urb);
}
}
if (qt_port->write_urb) {
/* if this urb had a transfer buffer already (old tx) free it */
if (qt_port->write_urb->transfer_buffer != NULL)
kfree(qt_port->write_urb->transfer_buffer);
usb_free_urb(qt_port->write_urb);
}
}
static int qt_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
int result;
struct usb_serial *serial = get_usb_serial(port, __func__);
if (serial == NULL)
return -ENODEV;
dbg("%s - port %d\n", __func__, port->number);
if (count == 0) {
dbg("%s - write request of 0 bytes\n", __func__);
return 0;
}
/* only do something if we have a bulk out endpoint */
if (serial->num_bulk_out) {
if (port->write_urb->status == -EINPROGRESS) {
dbg("%s - already writing\n", __func__);
return 0;
}
count =
(count > port->bulk_out_size) ? port->bulk_out_size : count;
memcpy(port->write_urb->transfer_buffer, buf, count);
/* 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, count,
qt_write_bulk_callback, port);
/* send the data out the bulk port */
result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
if (result)
dbg("%s - failed submitting write urb, error %d\n",
__func__, result);
else
result = count;
return result;
}
/* no bulk out, so return 0 bytes written */
return 0;
}
static int qt_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial;
struct quatech_port *qt_port;
unsigned long flags;
int retval = -EINVAL;
if (port_paranoia_check(port, __func__)) {
dbg("%s", "Invalid port\n");
return -1;
}
serial = get_usb_serial(port, __func__);
if (!serial)
return -ENODEV;
qt_port = qt_get_port_private(port);
spin_lock_irqsave(&qt_port->lock, flags);
dbg("%s - port %d\n", __func__, port->number);
if (serial->num_bulk_out) {
if (port->write_urb->status != -EINPROGRESS)
retval = port->bulk_out_size;
}
spin_unlock_irqrestore(&qt_port->lock, flags);
return retval;
}
static int qt_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct quatech_port *qt_port = qt_get_port_private(port);
struct usb_serial *serial = get_usb_serial(port, __func__);
unsigned int index;
dbg("%s cmd 0x%04x", __func__, cmd);
index = tty->index - serial->minor;
if (cmd == TIOCMIWAIT) {
while (qt_port != NULL) {
interruptible_sleep_on(&qt_port->msr_wait);
if (signal_pending(current))
return -ERESTARTSYS;
else {
char diff = qt_port->diff_status;
if (diff == 0)
return -EIO; /* no change => error */
/* Consume all events */
qt_port->diff_status = 0;
if (((arg & TIOCM_RNG)
&& (diff & SERIAL_MSR_RI))
|| ((arg & TIOCM_DSR)
&& (diff & SERIAL_MSR_DSR))
|| ((arg & TIOCM_CD)
&& (diff & SERIAL_MSR_CD))
|| ((arg & TIOCM_CTS)
&& (diff & SERIAL_MSR_CTS))) {
return 0;
}
}
}
return 0;
}
dbg("%s -No ioctl for that one. port = %d\n", __func__, port->number);
return -ENOIOCTLCMD;
}
static void qt_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct ktermios *termios = tty->termios;
unsigned char new_LCR = 0;
unsigned int cflag = termios->c_cflag;
unsigned int index;
int baud, divisor, remainder;
int status;
dbg("%s", __func__);
index = tty->index - port->serial->minor;
switch (cflag) {
case CS5:
new_LCR |= SERIAL_5_DATA;
break;
case CS6:
new_LCR |= SERIAL_6_DATA;
break;
case CS7:
new_LCR |= SERIAL_7_DATA;
break;
default:
case CS8:
new_LCR |= SERIAL_8_DATA;
break;
}
/* Parity stuff */
if (cflag & PARENB) {
if (cflag & PARODD)
new_LCR |= SERIAL_ODD_PARITY;
else
new_LCR |= SERIAL_EVEN_PARITY;
}
if (cflag & CSTOPB)
new_LCR |= SERIAL_TWO_STOPB;
else
new_LCR |= SERIAL_TWO_STOPB;
dbg("%s - 4\n", __func__);
/* Thats the LCR stuff, go ahead and set it */
baud = tty_get_baud_rate(tty);
if (!baud)
/* pick a default, any default... */
baud = 9600;
dbg("%s - got baud = %d\n", __func__, baud);
divisor = MAX_BAUD_RATE / baud;
remainder = MAX_BAUD_RATE % baud;
/* Round to nearest divisor */
if (((remainder * 2) >= baud) && (baud != 110))
divisor++;
/*
* Set Baud rate to default and turn off (default)flow control here
*/
status =
qt_setuart(port->serial, index, (unsigned short)divisor, new_LCR);
if (status < 0) {
dbg(__FILE__ "qt_setuart failed\n");
return;
}
/* Now determine flow control */
if (cflag & CRTSCTS) {
dbg("%s - Enabling HW flow control port %d\n", __func__,
port->number);
/* Enable RTS/CTS flow control */
status = BoxSetHW_FlowCtrl(port->serial, index, 1);
if (status < 0) {
dbg(__FILE__ "BoxSetHW_FlowCtrl failed\n");
return;
}
} else {
/* Disable RTS/CTS flow control */
dbg("%s - disabling HW flow control port %d\n", __func__,
port->number);
status = BoxSetHW_FlowCtrl(port->serial, index, 0);
if (status < 0) {
dbg(__FILE__ "BoxSetHW_FlowCtrl failed\n");
return;
}
}
/* if we are implementing XON/XOFF, set the start and stop character in
* the device */
if (I_IXOFF(tty) || I_IXON(tty)) {
unsigned char stop_char = STOP_CHAR(tty);
unsigned char start_char = START_CHAR(tty);
status =
BoxSetSW_FlowCtrl(port->serial, index, stop_char,
start_char);
if (status < 0)
dbg(__FILE__ "BoxSetSW_FlowCtrl (enabled) failed\n");
} else {
/* disable SW flow control */
status = BoxDisable_SW_FlowCtrl(port->serial, index);
if (status < 0)
dbg(__FILE__ "BoxSetSW_FlowCtrl (diabling) failed\n");
}
tty->termios->c_cflag &= ~CMSPAR;
/* FIXME: Error cases should be returning the actual bits changed only */
}
static void qt_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = get_usb_serial(port, __func__);
struct quatech_port *qt_port;
u16 index, onoff;
unsigned int result;
unsigned long flags;
index = tty->index - serial->minor;
qt_port = qt_get_port_private(port);
if (break_state == -1)
onoff = 1;
else
onoff = 0;
spin_lock_irqsave(&qt_port->lock, flags);
dbg("%s - port %d\n", __func__, port->number);
result =
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
QT_BREAK_CONTROL, 0x40, onoff, index, NULL, 0, 300);
spin_unlock_irqrestore(&qt_port->lock, flags);
}
static inline int qt_real_tiocmget(struct tty_struct *tty,
struct usb_serial_port *port,
struct file *file, struct usb_serial *serial)
{
u8 mcr;
u8 msr;
unsigned int result = 0;
int status;
unsigned int index;
dbg("%s - port %d, tty =0x%p\n", __func__, port->number, tty);
index = tty->index - serial->minor;
status =
BoxGetRegister(port->serial, index, MODEM_CONTROL_REGISTER, &mcr);
if (status >= 0) {
status =
BoxGetRegister(port->serial, index,
MODEM_STATUS_REGISTER, &msr);
}
if (status >= 0) {
result = ((mcr & SERIAL_MCR_DTR) ? TIOCM_DTR : 0)
/* DTR IS SET */
| ((mcr & SERIAL_MCR_RTS) ? TIOCM_RTS : 0)
/* RTS IS SET */
| ((msr & SERIAL_MSR_CTS) ? TIOCM_CTS : 0)
/* CTS is set */
| ((msr & SERIAL_MSR_CD) ? TIOCM_CAR : 0)
/* Carrier detect is set */
| ((msr & SERIAL_MSR_RI) ? TIOCM_RI : 0)
/* Ring indicator set */
| ((msr & SERIAL_MSR_DSR) ? TIOCM_DSR : 0);
/* DSR is set */
return result;
} else
return -ESPIPE;
}
static inline int qt_real_tiocmset(struct tty_struct *tty,
struct usb_serial_port *port,
struct file *file,
struct usb_serial *serial,
unsigned int value)
{
u8 mcr;
int status;
unsigned int index;
dbg("%s - port %d\n", __func__, port->number);
index = tty->index - serial->minor;
status =
BoxGetRegister(port->serial, index, MODEM_CONTROL_REGISTER, &mcr);
if (status < 0)
return -ESPIPE;
/*
* Turn off the RTS and DTR and loopbcck and then only turn on what was
* asked for
*/
mcr &= ~(SERIAL_MCR_RTS | SERIAL_MCR_DTR | SERIAL_MCR_LOOP);
if (value & TIOCM_RTS)
mcr |= SERIAL_MCR_RTS;
if (value & TIOCM_DTR)
mcr |= SERIAL_MCR_DTR;
if (value & TIOCM_LOOP)
mcr |= SERIAL_MCR_LOOP;
status =
BoxSetRegister(port->serial, index, MODEM_CONTROL_REGISTER, mcr);
if (status < 0)
return -ESPIPE;
else
return 0;
}
static int qt_tiocmget(struct tty_struct *tty, struct file *file)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = get_usb_serial(port, __func__);
struct quatech_port *qt_port = qt_get_port_private(port);
int retval = -ENODEV;
unsigned long flags;
dbg("In %s \n", __func__);
if (!serial)
return -ENODEV;
spin_lock_irqsave(&qt_port->lock, flags);
dbg("%s - port %d\n", __func__, port->number);
dbg("%s - port->RxHolding = %d\n", __func__, qt_port->RxHolding);
retval = qt_real_tiocmget(tty, port, file, serial);
spin_unlock_irqrestore(&qt_port->lock, flags);
return retval;
}
static int qt_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = get_usb_serial(port, __func__);
struct quatech_port *qt_port = qt_get_port_private(port);
unsigned long flags;
int retval = -ENODEV;
dbg("In %s \n", __func__);
if (!serial)
return -ENODEV;
spin_lock_irqsave(&qt_port->lock, flags);
dbg("%s - port %d \n", __func__, port->number);
dbg("%s - qt_port->RxHolding = %d\n", __func__, qt_port->RxHolding);
retval = qt_real_tiocmset(tty, port, file, serial, set);
spin_unlock_irqrestore(&qt_port->lock, flags);
return retval;
}
static void qt_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = get_usb_serial(port, __func__);
struct quatech_port *qt_port;
unsigned long flags;
dbg("%s - port %d\n", __func__, port->number);
if (!serial)
return;
qt_port = qt_get_port_private(port);
spin_lock_irqsave(&qt_port->lock, flags);
/* pass on to the driver specific version of this function */
qt_port->RxHolding = 1;
dbg("%s - port->RxHolding = 1\n", __func__);
spin_unlock_irqrestore(&qt_port->lock, flags);
return;
}
static void qt_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = get_usb_serial(port, __func__);
struct quatech_port *qt_port;
unsigned long flags;
unsigned int result;
if (!serial)
return;
qt_port = qt_get_port_private(port);
spin_lock_irqsave(&qt_port->lock, flags);
dbg("%s - port %d\n", __func__, port->number);
if (qt_port->RxHolding == 1) {
dbg("%s -qt_port->RxHolding == 1\n", __func__);
qt_port->RxHolding = 0;
dbg("%s - qt_port->RxHolding = 0\n", __func__);
/* if we have a bulk endpoint, start it up */
if ((serial->num_bulk_in) && (qt_port->ReadBulkStopped == 1)) {
/* Start reading from the device */
usb_fill_bulk_urb(port->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->
transfer_buffer_length,
qt_read_bulk_callback, port);
result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (result)
err("%s - failed restarting read urb, error %d",
__func__, result);
}
}
spin_unlock_irqrestore(&qt_port->lock, flags);
return;
}
static int qt_calc_num_ports(struct usb_serial *serial)
{
int num_ports;
dbg("numberofendpoints: %d \n",
(int)serial->interface->cur_altsetting->desc.bNumEndpoints);
dbg("numberofendpoints: %d \n",
(int)serial->interface->altsetting->desc.bNumEndpoints);
num_ports =
(serial->interface->cur_altsetting->desc.bNumEndpoints - 1) / 2;
return num_ports;
}
static struct usb_serial_driver quatech_device = {
.driver = {
.owner = THIS_MODULE,
.name = "serqt",
},
.description = DRIVER_DESC,
.usb_driver = &serqt_usb_driver,
.id_table = serqt_id_table,
.num_ports = 8,
.open = qt_open,
.close = qt_close,
.write = qt_write,
.write_room = qt_write_room,
.chars_in_buffer = qt_chars_in_buffer,
.throttle = qt_throttle,
.unthrottle = qt_unthrottle,
.calc_num_ports = qt_calc_num_ports,
.ioctl = qt_ioctl,
.set_termios = qt_set_termios,
.break_ctl = qt_break,
.tiocmget = qt_tiocmget,
.tiocmset = qt_tiocmset,
.attach = qt_startup,
.release = qt_release,
};
static int __init serqt_usb_init(void)
{
int retval;
dbg("%s\n", __func__);
/* register with usb-serial */
retval = usb_serial_register(&quatech_device);
if (retval)
goto failed_usb_serial_register;
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
DRIVER_DESC "\n");
/* register with usb */
retval = usb_register(&serqt_usb_driver);
if (retval == 0)
return 0;
/* if we're here, usb_register() failed */
usb_serial_deregister(&quatech_device);
failed_usb_serial_register:
return retval;
}
static void __exit serqt_usb_exit(void)
{
usb_deregister(&serqt_usb_driver);
usb_serial_deregister(&quatech_device);
}
module_init(serqt_usb_init);
module_exit(serqt_usb_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");
