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linux-next/drivers/usb/serial/metro-usb.c
Greg Kroah-Hartman 9fbd1649d5 USB: serial: metro-usb: remove function prototypes 
By rearranging the functions a bit, we can remove all function
prototypes.

Note, this also deleted the _close function, as it wasn't needed, it was
doing the same thing the cleanup function did, so just call that
instead.

Cc: Aleksey Babahin <tamerlan311@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-03-08 13:55:41 -08:00

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/*
Some of this code is credited to Linux USB open source files that are
distributed with Linux.
Copyright: 2007 Metrologic Instruments. All rights reserved.
Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/uaccess.h>
#include <linux/usb/serial.h>
/* Version Information */
#define DRIVER_VERSION "v1.2.0.0"
#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
/* Product information. */
#define FOCUS_VENDOR_ID 0x0C2E
#define FOCUS_PRODUCT_ID 0x0720
#define FOCUS_PRODUCT_ID_UNI 0x0710
#define METROUSB_SET_REQUEST_TYPE 0x40
#define METROUSB_SET_MODEM_CTRL_REQUEST 10
#define METROUSB_SET_BREAK_REQUEST 0x40
#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
#define WDR_TIMEOUT 5000 /* default urb timeout. */
/* Private data structure. */
struct metrousb_private {
spinlock_t lock;
int throttled;
unsigned long control_state;
};
/* Device table list. */
static struct usb_device_id id_table[] = {
{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID) },
{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
{ }, /* Terminating entry. */
};
MODULE_DEVICE_TABLE(usb, id_table);
/* Input parameter constants. */
static bool debug;
/* ----------------------------------------------------------------------------------------------
Description:
Read the port from the read interrupt.
Input:
struct urb *: urb structure to get data.
struct pt_regs *: pt_regs structure.
Output:
None:
*/
static void metrousb_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
int throttled = 0;
int result = 0;
unsigned long flags = 0;
dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
switch (urb->status) {
case 0:
/* Success status, read from the port. */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* urb has been terminated. */
dbg("METRO-USB - %s - urb shutting down, port number=%d, error code=%d",
__FUNCTION__, port->number, result);
return;
default:
dbg("METRO-USB - %s - non-zero urb received, port number=%d, error code=%d",
__FUNCTION__, port->number, result);
goto exit;
}
/* Set the data read from the usb port into the serial port buffer. */
tty = tty_port_tty_get(&port->port);
if (!tty) {
dbg("%s - bad tty pointer - exiting", __func__);
return;
}
if (tty && urb->actual_length) {
/* Loop through the data copying each byte to the tty layer. */
tty_insert_flip_string(tty, data, urb->actual_length);
/* Force the data to the tty layer. */
tty_flip_buffer_push(tty);
}
tty_kref_put(tty);
/* Set any port variables. */
spin_lock_irqsave(&metro_priv->lock, flags);
throttled = metro_priv->throttled;
spin_unlock_irqrestore(&metro_priv->lock, flags);
/* Continue trying to read if set. */
if (!throttled) {
usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer,
port->interrupt_in_urb->transfer_buffer_length,
metrousb_read_int_callback, port, 1);
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result) {
dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
__FUNCTION__, port->number, result);
}
}
return;
exit:
/* Try to resubmit the urb. */
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
__FUNCTION__, port->number, result);
}
}
/* ----------------------------------------------------------------------------------------------
Description:
Clean up any urbs and port information.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
Output:
int: Returns true (0) if successful, false otherwise.
*/
static void metrousb_cleanup(struct usb_serial_port *port)
{
dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
if (port->serial->dev) {
/* Shutdown any interrupt in urbs. */
if (port->interrupt_in_urb) {
usb_unlink_urb(port->interrupt_in_urb);
usb_kill_urb(port->interrupt_in_urb);
}
}
}
/* ----------------------------------------------------------------------------------------------
Description:
Open the drivers serial port.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
struct file *: pointer to a file structure.
Output:
int: Returns true (0) if successful, false otherwise.
*/
static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
int result = 0;
dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
/* Make sure the urb is initialized. */
if (!port->interrupt_in_urb) {
dbg("METRO-USB - %s - interrupt urb not initialized for port number=%d", __FUNCTION__, port->number);
return -ENODEV;
}
/* Set the private data information for the port. */
spin_lock_irqsave(&metro_priv->lock, flags);
metro_priv->control_state = 0;
metro_priv->throttled = 0;
spin_unlock_irqrestore(&metro_priv->lock, flags);
/*
* 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.
*/
if (tty)
tty->low_latency = 1;
/* Clear the urb pipe. */
usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
/* Start reading from the device */
usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer,
port->interrupt_in_urb->transfer_buffer_length,
metrousb_read_int_callback, port, 1);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result) {
dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d"
, __FUNCTION__, port->number, result);
goto exit;
}
dbg("METRO-USB - %s - port open for port number=%d", __FUNCTION__, port->number);
exit:
return result;
}
/* ----------------------------------------------------------------------------------------------
Description:
Set the modem control state for the entered serial port.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
unsigned int: control state value to set.
Output:
int: Returns true (0) if successful, false otherwise.
*/
static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
{
int retval = 0;
unsigned char mcr = METROUSB_MCR_NONE;
dbg("METRO-USB - %s - control state=%d", __FUNCTION__, control_state);
/* Set the modem control value. */
if (control_state & TIOCM_DTR)
mcr |= METROUSB_MCR_DTR;
if (control_state & TIOCM_RTS)
mcr |= METROUSB_MCR_RTS;
/* Send the command to the usb port. */
retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
control_state, 0, NULL, 0, WDR_TIMEOUT);
if (retval < 0)
dbg("METRO-USB - %s - set modem ctrl=0x%x failed, error code=%d", __FUNCTION__, mcr, retval);
return retval;
}
/* ----------------------------------------------------------------------------------------------
Description:
Shutdown the driver.
Input:
struct usb_serial *: pointer to a usb-serial structure.
Output:
int: Returns true (0) if successful, false otherwise.
*/
static void metrousb_shutdown(struct usb_serial *serial)
{
int i = 0;
dbg("METRO-USB - %s", __FUNCTION__);
/* Stop reading and writing on all ports. */
for (i = 0; i < serial->num_ports; ++i) {
/* Close any open urbs. */
metrousb_cleanup(serial->port[i]);
/* Free memory. */
kfree(usb_get_serial_port_data(serial->port[i]));
usb_set_serial_port_data(serial->port[i], NULL);
dbg("METRO-USB - %s - freed port number=%d", __FUNCTION__, serial->port[i]->number);
}
}
/* ----------------------------------------------------------------------------------------------
Description:
Startup the driver.
Input:
struct usb_serial *: pointer to a usb-serial structure.
Output:
int: Returns true (0) if successful, false otherwise.
*/
static int metrousb_startup(struct usb_serial *serial)
{
struct metrousb_private *metro_priv;
struct usb_serial_port *port;
int i = 0;
dbg("METRO-USB - %s", __FUNCTION__);
/* Loop through the serial ports setting up the private structures.
* Currently we only use one port. */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
/* Declare memory. */
metro_priv = kmalloc(sizeof(struct metrousb_private), GFP_KERNEL);
if (!metro_priv)
return -ENOMEM;
/* Clear memory. */
memset(metro_priv, 0x00, sizeof(struct metrousb_private));
/* Initialize memory. */
spin_lock_init(&metro_priv->lock);
usb_set_serial_port_data(port, metro_priv);
dbg("METRO-USB - %s - port number=%d.", __FUNCTION__, port->number);
}
return 0;
}
/* ----------------------------------------------------------------------------------------------
Description:
Set the serial port throttle to stop reading from the port.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
Output:
None:
*/
static void metrousb_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
/* Set the private information for the port to stop reading data. */
spin_lock_irqsave(&metro_priv->lock, flags);
metro_priv->throttled = 1;
spin_unlock_irqrestore(&metro_priv->lock, flags);
}
/* ----------------------------------------------------------------------------------------------
Description:
Get the serial port control line states.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
struct file *: pointer to a file structure.
Output:
int: Returns the state of the control lines.
*/
static int metrousb_tiocmget(struct tty_struct *tty)
{
unsigned long control_state = 0;
struct usb_serial_port *port = tty->driver_data;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
spin_lock_irqsave(&metro_priv->lock, flags);
control_state = metro_priv->control_state;
spin_unlock_irqrestore(&metro_priv->lock, flags);
return control_state;
}
/* ----------------------------------------------------------------------------------------------
Description:
Set the serial port control line states.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
struct file *: pointer to a file structure.
unsigned int: line state to set.
unsigned int: line state to clear.
Output:
int: Returns the state of the control lines.
*/
static int metrousb_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
unsigned long control_state = 0;
dbg("METRO-USB - %s - port number=%d, set=%d, clear=%d", __FUNCTION__, port->number, set, clear);
spin_lock_irqsave(&metro_priv->lock, flags);
control_state = metro_priv->control_state;
/* Set the RTS and DTR values. */
if (set & TIOCM_RTS)
control_state |= TIOCM_RTS;
if (set & TIOCM_DTR)
control_state |= TIOCM_DTR;
if (clear & TIOCM_RTS)
control_state &= ~TIOCM_RTS;
if (clear & TIOCM_DTR)
control_state &= ~TIOCM_DTR;
metro_priv->control_state = control_state;
spin_unlock_irqrestore(&metro_priv->lock, flags);
return metrousb_set_modem_ctrl(serial, control_state);
}
/* ----------------------------------------------------------------------------------------------
Description:
Set the serial port unthrottle to resume reading from the port.
Input:
struct usb_serial_port *: pointer to a usb_serial_port structure.
Output:
None:
*/
static void metrousb_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
unsigned long flags = 0;
int result = 0;
dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number);
/* Set the private information for the port to resume reading data. */
spin_lock_irqsave(&metro_priv->lock, flags);
metro_priv->throttled = 0;
spin_unlock_irqrestore(&metro_priv->lock, flags);
/* Submit the urb to read from the port. */
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result) {
dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d",
__FUNCTION__, port->number, result);
}
}
/* Driver structure. */
static struct usb_driver metrousb_driver = {
.name = "metro-usb",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table
};
/* Device structure. */
static struct usb_serial_driver metrousb_device = {
.driver = {
.owner = THIS_MODULE,
.name = "metro-usb",
},
.description = "Metrologic USB to serial converter.",
.id_table = id_table,
.num_ports = 1,
.open = metrousb_open,
.close = metrousb_cleanup,
.read_int_callback = metrousb_read_int_callback,
.attach = metrousb_startup,
.release = metrousb_shutdown,
.throttle = metrousb_throttle,
.unthrottle = metrousb_unthrottle,
.tiocmget = metrousb_tiocmget,
.tiocmset = metrousb_tiocmset,
};
static struct usb_serial_driver * const serial_drivers[] = {
&metrousb_device,
NULL,
};
module_usb_serial_driver(metrousb_driver, serial_drivers);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Philip Nicastro");
MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
/* Module input parameters */
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)");
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