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Staging: quatech_usb2: implement open functionality 

Part two of the driver implementation has finally got done. It
implements the rest of open and the callback for reads from the box. I
seem to have finally found a structure that can be made to work, with a
single set of URBs for bulk read and write for the whole device, which
are used by all the ports. I've rationalised a few things, but there
will still be a lot of clean-up needed.

This one definitely can panic the kernel when a port is opened for
reading, but I'm off on holiday so I thought I'd post where I have got
to so far. I haven't tried to debug why it panics with a null pointer
dereference yet.

Signed-off-by: Richard Ash <richard@audacityteam.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Richard Ash 2009-07-29 17:12:18 +01:00 committed by Greg Kroah-Hartman
parent c4f3020fc4
commit 72ba94ec61
1 changed files with 517 additions and 71 deletions
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588
drivers/staging/quatech_usb2/quatech_usb2.c
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@ -38,6 +38,7 @@ static int debug;
#define QU2BOXPWRON 0x8000 /* magic number to turn FPGA power on */
#define QU2BOX232 0x40 /* RS232 mode on MEI devices */
#define QU2BOXSPD9600 0x60 /* set speed to 9600 baud */
#define FIFO_DEPTH 1024 /* size of hardware fifos */
/* directions for USB transfers */
#define USBD_TRANSFER_DIRECTION_IN 0xc0
#define USBD_TRANSFER_DIRECTION_OUT 0x40
@ -84,6 +85,12 @@ static int debug;
#define SERIAL_LSR_FE 0x08
#define SERIAL_LSR_BI 0x10
/* handy macros for doing escape sequence parsing on data reads */
#define THISCHAR ((unsigned char *)(urb->transfer_buffer))[i]
#define NEXTCHAR ((unsigned char *)(urb->transfer_buffer))[i + 1]
#define THIRDCHAR ((unsigned char *)(urb->transfer_buffer))[i + 2]
#define FOURTHCHAR ((unsigned char *)(urb->transfer_buffer))[i + 3]
#define FIFTHCHAR ((unsigned char *)(urb->transfer_buffer))[i + 4]
static struct usb_device_id quausb2_id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
@ -99,8 +106,6 @@ static struct usb_device_id quausb2_id_table[] = {
MODULE_DEVICE_TABLE(usb, quausb2_id_table);
/* custom structures we need go here */
static struct usb_driver quausb2_usb_driver = {
.name = "quatech-usb2-serial",
.probe = usb_serial_probe,
@ -109,10 +114,35 @@ static struct usb_driver quausb2_usb_driver = {
.no_dynamic_id = 1,
};
/* structure in which to keep all the messy stuff that this driver needs
* alongside the usb_serial_port structure */
/** structure in which to keep all the messy stuff that this driver needs
* alongside the usb_serial_port structure
* @param read_urb_busy Flag indicating that port->read_urb is in use
* @param close_pending flag indicating that this port is in the process of
* being closed.
* @param shadowLSR Last received state of the line status register, holds the
* value of the line status flags from the port
* @param shadowMSR Last received state of the modem status register, holds
* the value of the modem status received from the port
* @param xmit_pending_bytes Number of bytes waiting to be sent out of
* the serial port
* @param xmit_fifo_room_bytes free space available in the transmit fifo
* for this port on the box
* @param rcv_flush Flag indicating that a receive flush has been requested by
* the hardware.
* @param xmit_flush Flag indicating that a transmit flush has been requested by
* the hardware.
*/
struct quatech2_port {
int magic;
bool read_urb_busy;
bool close_pending;
__u8 shadowLSR;
__u8 shadowMSR;
int xmit_pending_bytes;
int xmit_fifo_room_bytes;
char rcv_flush;
char xmit_flush;
char active; /* someone has this device open */
unsigned char *xfer_to_tty_buffer;
wait_queue_head_t wait;
@ -120,20 +150,27 @@ struct quatech2_port {
struct semaphore sem; /* locks this structure */
__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; /* ports open on whole device */
char RxHolding;
char Rcv_Flush;
char Xmit_Flush;
char closePending;
char fifo_empty_flag;
int xmit_pending_bytes;
int xmit_fifo_room_bytes;
struct semaphore pend_xmit_sem; /* locks this structure */
spinlock_t lock;
};
/**
* Structure to hold device-wide internal status information
* @param ReadBulkStopped The last bulk read attempt ended in tears
* @param open_ports The number of serial ports currently in use on the box
* @param current_port Pointer to the serial port structure of the port which
* the read stream is currently directed to. Escape sequences in the read
* stream will change this around as data arrives from different ports on the
* box
*/
struct quatech2_dev {
bool ReadBulkStopped;
char open_ports;
struct usb_serial_port *current_port;
};
/* structure which holds line and modem status flags */
struct qt2_status_data {
__u8 line_status;
@ -152,12 +189,30 @@ static inline struct quatech2_port *qt2_get_port_private(struct usb_serial_port
*port);
static inline void qt2_set_port_private(struct usb_serial_port *port,
struct quatech2_port *data);
static inline struct quatech2_dev *qt2_get_dev_private(struct usb_serial
*serial);
static inline void qt2_set_dev_private(struct usb_serial *serial,
struct quatech2_dev *data);
static int qt2_openboxchannel(struct usb_serial *serial, __u16
Uart_Number, struct qt2_status_data *pDeviceData);
static int qt2_closeboxchannel(struct usb_serial *serial, __u16
Uart_Number);
static int qt2_conf_uart(struct usb_serial *serial, unsigned short Uart_Number,
unsigned short divisor, unsigned char LCR);
static void qt2_read_bulk_callback(struct urb *urb);
static void qt2_process_line_status(struct usb_serial_port *port,
unsigned char LineStatus);
static void qt2_process_modem_status(struct usb_serial_port *port,
unsigned char ModemStatus);
static void qt2_process_xmit_empty(struct usb_serial_port *port,
unsigned char fourth_char, unsigned char fifth_char);
static void qt2_process_port_change(struct usb_serial_port *port,
unsigned char New_Current_Port);
static void qt2_process_rcv_flush(struct usb_serial_port *port);
static void qt2_process_xmit_flush(struct usb_serial_port *port);
static void qt2_process_rx_char(struct usb_serial_port *port,
unsigned char data);
/* implementation functions, roughly in order of use, are here */
static int qt2_calc_num_ports(struct usb_serial *serial)
{
@ -195,12 +250,13 @@ static int qt2_calc_num_ports(struct usb_serial *serial)
static int qt2_attach(struct usb_serial *serial)
{
struct usb_serial_port *port;
struct quatech2_port *qt2_port;
struct quatech2_port *qt2_port; /* port-specific private data pointer */
struct quatech2_dev *qt2_dev; /* dev-specific private data pointer */
int i;
/* stuff for printing endpoint addresses, not needed for
* production */
/* stuff for storing endpoint addresses now */
struct usb_endpoint_descriptor *endpoint;
struct usb_host_interface *iface_desc;
struct usb_serial_port *port0; /* first port structure on device */
/* check how many endpoints there are on the device, for
* sanity's sake */
@ -212,30 +268,20 @@ static int qt2_attach(struct usb_serial *serial)
return -ENODEV;
}
iface_desc = serial->interface->cur_altsetting;
/* print endpoint addresses so we can check them later
* by hand */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
{
endpoint = &iface_desc->endpoint[i].desc;
if ((endpoint->bEndpointAddress & 0x80) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk in endpoint */
dbg("found bulk in at 0x%x",
endpoint->bEndpointAddress);
}
if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
((endpoint->bmAttributes & 3) == 0x02))
{
/* we found a bulk out endpoint */
dbg("found bulk out at 0x%x",
endpoint->bEndpointAddress);
}
} /* end printing endpoint addresses */
/* Set up per-device private data, storing extra data alongside
* struct usb_serial */
qt2_dev = kzalloc(sizeof(*qt2_dev), GFP_KERNEL);
if (!qt2_dev) {
dbg("%s: kmalloc for quatech2_dev failed!",
__func__);
return -ENOMEM;
}
qt2_dev->open_ports = 0; /* no ports open */
qt2_set_dev_private(serial, qt2_dev); /* store private data */
/* Now setup per port private data, which replaces all the things
* that quatech added to standard kernel structures in their driver */
* that quatech added to standard kernel structures in their driver */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
qt2_port = kzalloc(sizeof(*qt2_port), GFP_KERNEL);
@ -245,14 +291,34 @@ static int qt2_attach(struct usb_serial *serial)
return -ENOMEM;
}
spin_lock_init(&qt2_port->lock);
if (i == 0)
qt2_port->open_ports = 0; /* no ports */
else
qt2_port->open_ports = -1; /* unused */
usb_set_serial_port_data(port, qt2_port);
}
/* gain access to port[0]'s structure because we want to store
* device-level stuff in it */
if (serial_paranoia_check(serial, __func__))
return -ENODEV;
port0 = serial->port[0]; /* get the first port's device structure */
/* print endpoint addresses so we can check them later
* by hand */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if ((endpoint->bEndpointAddress & 0x80) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk in endpoint */
dbg("found bulk in at 0x%x",
endpoint->bEndpointAddress);
}
if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
((endpoint->bmAttributes & 3) == 0x02)) {
/* we found a bulk out endpoint */
dbg("found bulk out at 0x%x",
endpoint->bEndpointAddress);
}
} /* end printing endpoint addresses */
/* switch on power to the hardware */
if (qt2_boxpoweron(serial) < 0) {
dbg("qt2_boxpoweron() failed");
@ -274,8 +340,11 @@ startup_error:
port = serial->port[i];
qt2_port = qt2_get_port_private(port);
kfree(qt2_port);
usb_set_serial_port_data(port, NULL);
qt2_set_port_private(port, NULL);
}
qt2_dev = qt2_get_dev_private(serial);
kfree(qt2_dev);
qt2_set_dev_private(serial, NULL);
dbg("Exit fail %s\n", __func__);
return -EIO;
@ -317,30 +386,40 @@ int qt2_open(struct tty_struct *tty,
struct usb_serial_port *port0; /* first port structure on device */
struct quatech2_port *port_extra; /* extra data for this port */
struct quatech2_port *port0_extra; /* extra data for first port */
struct quatech2_dev *dev_extra; /* extra data for the device */
struct qt2_status_data ChannelData;
unsigned short default_divisor = QU2BOXSPD9600;
unsigned char default_LCR = SERIAL_8_DATA;
int status;
int result;
if (port_paranoia_check(port, __func__))
return -ENODEV;
dbg("%s - port %d\n", __func__, port->number);
dbg("%s(): port %d", __func__, port->number);
serial = port->serial; /* get the parent device structure */
if (serial_paranoia_check(serial, __func__))
if (serial_paranoia_check(serial, __func__)) {
dbg("usb_serial struct failed sanity check");
return -ENODEV;
}
dev_extra = qt2_get_dev_private(serial);
/* get the device private data */
port0 = serial->port[0]; /* get the first port's device structure */
if (port_paranoia_check(port, __func__)) {
dbg("port0 usb_serial_port struct failed sanity check");
return -ENODEV;
}
port_extra = qt2_get_port_private(port);
port0_extra = qt2_get_port_private(port0);
if (port_extra == NULL || port0_extra == NULL)
if (port_extra == NULL || port0_extra == NULL) {
dbg("failed to get private data for port and port0");
return -ENODEV;
}
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
port0_extra->open_ports++;
/* FIXME: are these needed? Does it even do anything useful? */
/* get the modem and line status values from the UART */
@ -374,39 +453,58 @@ int qt2_open(struct tty_struct *tty,
dbg("qt2_conf_uart() completed on channel %d",
port->number);
/*
* At this point we will need some end points to make further progress.
* Handlily, the correct endpoint addresses have been filled out into
* the usb_serial_port structure for us by the driver core, so we
* already have access to them.
* As there is only one bulk in and one bulk out end-point, these are in
* port[0]'s structure, and the rest are uninitialised. Handily,
* when we do a write to a port, we will use the same endpoint
* regardless of the port, with a 5-byte header added on to
* tell the box which port it should eventually come out of, so we only
* need the one set of endpoints.
* Finally we need a bulk in URB to use for background reads from the
* device, which will deal with uplink data from the box to host.
*/
dbg("port number is %d", port->number);
dbg("serial number is %d", port->serial->minor);
dbg("port0 bulk in endpoint is %#.2x", port0->bulk_in_endpointAddress);
dbg("port0 bulk out endpoint is %#.2x",
port0->bulk_out_endpointAddress);
/* We need to set up endpoints here. We only
* have one pair of endpoints per device, so in fact
* we only need to set up endpoints on the first time
* round, not subsequent ones.
* When we do a write to a port, we will use the same endpoint
* regardless of the port, with a 5-byte header added on to
* tell the box which port it should eventually come out of,
* so the same endpoint information needs to be visible to
* write calls regardless of which port is being written.
* To this end we actually keep the relevant endpoints
* in port 0's structure, because that's always there
* and avoids providing our own duplicate members in some
* user data structure for the same purpose.
* URBs will be allocated and freed dynamically as the are
* used, so are not touched here.
*/
if (port0_extra->open_ports == 1) {
/* this is first port to be opened */
if (dev_extra->open_ports == 0) {
/* this is first port to be opened, so need some URBs */
/* initialise read_urb for bulk in transfers */
usb_fill_bulk_urb(port0->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port0->bulk_in_endpointAddress),
port0->bulk_in_buffer,
port0->bulk_in_size,
qt2_read_bulk_callback, serial);
dbg("port0 bulk in URB intialised");
/* submit URB, i.e. start reading from device (async) */
dev_extra->ReadBulkStopped = false;
port_extra->read_urb_busy = true;
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev,
"%s - Error %d submitting bulk in urb\n",
__func__, result);
port_extra->read_urb_busy = false;
}
}
dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
/* initialize our wait queues */
init_waitqueue_head(&port_extra->wait);
/* remember to store port_extra and port0 back again at end !*/
qt2_set_port_private(port, port_extra);
qt2_set_port_private(serial->port[0], port0_extra);
qt2_set_dev_private(serial, dev_extra);
dev_extra->open_ports++; /* one more port opened */
return 0;
}
@ -486,11 +584,22 @@ static inline struct quatech2_port *qt2_get_port_private(struct usb_serial_port
}
static inline void qt2_set_port_private(struct usb_serial_port *port,
struct quatech2_port *data)
struct quatech2_port *data)
{
usb_set_serial_port_data(port, (void *)data);
}
static inline struct quatech2_dev *qt2_get_dev_private(struct usb_serial
*serial)
{
return (struct quatech2_dev *)usb_get_serial_data(serial);
}
static inline void qt2_set_dev_private(struct usb_serial *serial,
struct quatech2_dev *data)
{
usb_set_serial_data(serial, (void *)data);
}
static int qt2_openboxchannel(struct usb_serial *serial, __u16
Uart_Number, struct qt2_status_data *status)
{
@ -534,6 +643,343 @@ static int qt2_conf_uart(struct usb_serial *serial, unsigned short Uart_Number,
return result;
}
/** @brief Callback for asynchronous submission of URBs on bulk in
* endpoints
*
* Registered in qt2_open_port(), used to deal with incomming data
* from the box.
*/
static void qt2_read_bulk_callback(struct urb *urb)
{
/* Get the device pointer (struct usb_serial) back out of the URB */
struct usb_serial *serial = urb->context;
/* get the extra struct for the device */
struct quatech2_dev *dev_extra = qt2_get_dev_private(serial);
/* Get first port structure from the device */
struct usb_serial_port *port0 = serial->port[0];
/* Get the currently active port structure from serial struct */
struct usb_serial_port *active = dev_extra->current_port;
/* get the extra struct for port 0 */
struct quatech2_port *port0_extra = qt2_get_port_private(port0);
/* and for the currently active port */
struct quatech2_port *active_extra = qt2_get_port_private(active);
/* When we finally get to doing some tty stuff, we will need this */
struct tty_struct *tty_st;
unsigned int RxCount; /* the length of the data to process */
unsigned int i; /* loop counter over the data to process */
int result; /* return value cache variable */
bool escapeflag; /* flag set to true if this loop iteration is
* parsing an escape sequence, rather than
* ordinary data */
dbg("%s(): callback running", __func__);
if (urb->status) {
/* read didn't go well */
dev_extra->ReadBulkStopped = true;
dbg("%s(): nonzero write bulk status received: %d",
__func__, urb->status);
return;
}
/* inline port_sofrint() here */
if (port_paranoia_check(port0, __func__) != 0) {
dbg("%s - port_paranoia_check on port0 failed, exiting\n",
__func__);
return;
}
if (port_paranoia_check(active, __func__) != 0) {
dbg("%s - port_paranoia_check on current_port "
"failed, exiting", __func__);
return;
}
/* This single callback function has to do for all the ports on
* the device. Data being read up the USB can contain certain
* escape sequences which are used to communicate out-of-band
* information from the serial port in-band over the USB.
* These escapes include sending modem and flow control line
* status, and switching the port. The concept of a "Current Port"
* is used, which is where data is going until a port change
* escape seqence is received. This Current Port is kept between
* callbacks so that when this function enters we know which the
* currently active port is and can get to work right away without
* the box having to send repeat escape sequences (anyway, how
* would it know to do so?).
*/
if (active_extra->close_pending == true) {
/* We are closing , stop reading */
dbg("%s - (active->close_pending == true", __func__);
if (dev_extra->open_ports <= 0) {
/* If this is the only port left open - stop the
* bulk read */
dev_extra->ReadBulkStopped = true;
dbg("%s - (ReadBulkStopped == true;", __func__);
return;
}
}
/*
* 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 ((port0_extra->RxHolding == true) &&
(serial->dev->descriptor.idProduct == QUATECH_SSU2_100)) {
/* single port device, input is already stopped, so we don't
* need any more input data */
dev_extra->ReadBulkStopped = true;
return;
}
/* finally, we are in a situation where we might consider the data
* that is contained within the URB, and what to do about it.
* This is likely to involved communicating up to the TTY layer, so
* we will need to get hold of the tty for the port we are currently
* dealing with */
/* active is a usb_serial_port. It has a member port which is a
* tty_port. From this we get a tty_struct pointer which is what we
* actually wanted, and keep it on tty_st */
tty_st = tty_port_tty_get(&active->port);
if (!tty_st) {
dbg("%s - bad tty pointer - exiting", __func__);
return;
}
dbg("%s(): active port %d, tty_st =0x%p\n", __func__, active->number,
tty_st);
RxCount = urb->actual_length; /* grab length of data handy */
if (RxCount) {
/* skip all this if no data to process */
for (i = 0; i < RxCount ; ++i) {
/* Look ahead code here -works on several bytes at onc*/
if ((i <= (RxCount - 3)) && (THISCHAR == 0x1b)
&& (NEXTCHAR == 0x1b)) {
/* we are in an escape sequence, type
* determined by the 3rd char */
escapeflag = false;
switch (THIRDCHAR) {
case 0x00:
/* Line status change 4th byte must
* follow */
if (i > (RxCount - 4)) {
dbg("Illegal escape sequences "
"in received data");
break;
}
qt2_process_line_status(active,
FOURTHCHAR);
i += 3;
escapeflag = true;
break;
case 0x01:
/* Modem status status change 4th byte
* must follow */
if (i > (RxCount - 4)) {
dbg("Illegal escape sequences "
"in received data");
break;
}
qt2_process_modem_status(active,
FOURTHCHAR);
i += 3;
escapeflag = true;
break;
case 0x02:
/* xmit hold empty 4th byte
* must follow */
if (i > (RxCount - 4)) {
dbg("Illegal escape sequences "
"in received data");
break;
}
qt2_process_xmit_empty(active,
FOURTHCHAR,
FIFTHCHAR);
i += 4;
escapeflag = true;
break;
case 0x03:
/* Port number change 4th byte
* must follow */
if (i > (RxCount - 4)) {
dbg("Illegal escape sequences "
"in received data");
break;
}
/* Port change. If port open push
* current data up to tty layer */
if (dev_extra->open_ports > 0)
tty_flip_buffer_push(tty_st);
dbg("Port Change: new port = %d",
FOURTHCHAR);
qt2_process_port_change(active,
FOURTHCHAR);
i += 3;
escapeflag = true;
/* having changed port, the pointers for
* the currently active port are all out
* of date and need updating */
active = dev_extra->current_port;
active_extra =
qt2_get_port_private(active);
tty_st = tty_port_tty_get(
&active->port);
break;
case 0x04:
/* Recv flush 3rd byte must
* follow */
if (i > (RxCount - 3)) {
dbg("Illegal escape sequences "
"in received data");
break;
}
qt2_process_rcv_flush(active);
i += 2;
escapeflag = true;
break;
case 0x05:
/* xmit flush 3rd byte must follow */
if (i > (RxCount - 3)) {
dbg("Illegal escape sequences "
"in received data");
break;
}
qt2_process_xmit_flush(active);
i += 2;
escapeflag = true;
break;
case 0xff:
dbg("No status sequence");
qt2_process_rx_char(active, THISCHAR);
qt2_process_rx_char(active, NEXTCHAR);
i += 2;
break;
default:
qt2_process_rx_char(active, THISCHAR);
i += 1;
break;
} /*end switch*/
if (escapeflag == true)
continue;
/* if we did an escape char, we don't need
* to mess around pushing data through the
* tty layer, and can go round again */
} /*endif*/
if (tty_st && urb->actual_length) {
tty_buffer_request_room(tty_st, 1);
tty_insert_flip_string(tty_st,
&((unsigned char *)(urb->transfer_buffer)
)[i],
1);
}
} /*endfor*/
tty_flip_buffer_push(tty_st);
} /*endif*/
/* at this point we have complete dealing with the data for this
* callback. All we have to do now is to start the async read process
* back off again. */
usb_fill_bulk_urb(port0->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev, port0->bulk_in_endpointAddress),
port0->bulk_in_buffer, port0->bulk_in_size,
qt2_read_bulk_callback, serial);
result = usb_submit_urb(port0->read_urb, GFP_ATOMIC);
if (result) {
dbg("%s(): failed resubmitting read urb, error %d",
__func__, result);
} else {
if (tty_st && RxCount) {
/* if some inbound data was processed, then
* we need to push that through the tty layer
*/
tty_flip_buffer_push(tty_st);
tty_schedule_flip(tty_st);
}
}
/* cribbed from serqt_usb2 driver, but not sure which work needs
* scheduling - port0 or currently active port? */
/* schedule_work(&port->work); */
return;
}
static void qt2_process_line_status(struct usb_serial_port *port,
unsigned char LineStatus)
{
/* obtain the private structure for the port */
struct quatech2_port *port_extra = qt2_get_port_private(port);
port_extra->shadowLSR = LineStatus & (SERIAL_LSR_OE | SERIAL_LSR_PE |
SERIAL_LSR_FE | SERIAL_LSR_BI);
}
static void qt2_process_modem_status(struct usb_serial_port *port,
unsigned char ModemStatus)
{
/* obtain the private structure for the port */
struct quatech2_port *port_extra = qt2_get_port_private(port);
port_extra->shadowMSR = ModemStatus;
/* ?? */
wake_up_interruptible(&port_extra->wait);
}
static void qt2_process_xmit_empty(struct usb_serial_port *port,
unsigned char fourth_char, unsigned char fifth_char)
{
int byte_count;
/* obtain the private structure for the port */
struct quatech2_port *port_extra = qt2_get_port_private(port);
byte_count = (int)(fifth_char * 16);
byte_count += (int)fourth_char;
port_extra->xmit_pending_bytes -= (int)byte_count;
port_extra->xmit_fifo_room_bytes = FIFO_DEPTH;
}
static void qt2_process_port_change(struct usb_serial_port *port,
unsigned char New_Current_Port)
{
/* obtain the parent usb serial device structure */
struct usb_serial *serial = port->serial;
/* obtain the private structure for the device */
struct quatech2_dev *dev_extra = qt2_get_dev_private(serial);
dev_extra->current_port = serial->port[New_Current_Port];
/* what should I do with this? commented out in upstream
* driver */
/*schedule_work(&port->work);*/
}
static void qt2_process_rcv_flush(struct usb_serial_port *port)
{
/* obtain the private structure for the port */
struct quatech2_port *port_extra = qt2_get_port_private(port);
port_extra->rcv_flush = true;
}
static void qt2_process_xmit_flush(struct usb_serial_port *port)
{
/* obtain the private structure for the port */
struct quatech2_port *port_extra = qt2_get_port_private(port);
port_extra->xmit_flush = true;
}
static void qt2_process_rx_char(struct usb_serial_port *port,
unsigned char data)
{
/* get the tty_struct for this port */
struct tty_struct *tty = tty_port_tty_get(&(port->port));
/* get the URB with the data in to push */
struct urb *urb = port->serial->port[0]->read_urb;
if (tty && urb->actual_length) {
tty_buffer_request_room(tty, 1);
tty_insert_flip_string(tty, &data, 1);
/* should this be commented out here? */
/*tty_flip_buffer_push(tty);*/
}
}
/*
* last things in file: stuff to register this driver into the generic
* USB serial framework.