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linux/drivers/usb/serial/usb-serial.h
Greg Kroah-Hartman 507ca9bc04 [PATCH] USB: add ability for usb-serial drivers to determine if their write urb is currently being used. 
This removes a lot of racy and buggy code by trying to check the status of the urb.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-27 14:43:47 -07:00

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/*
* USB Serial Converter driver
*
* Copyright (C) 1999 - 2004
* Greg Kroah-Hartman (greg@kroah.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* See Documentation/usb/usb-serial.txt for more information on using this driver
*
* (03/26/2002) gkh
* removed the port->tty check from port_paranoia_check() due to serial
* consoles not having a tty device assigned to them.
*
* (12/03/2001) gkh
* removed active from the port structure.
* added documentation to the usb_serial_device_type structure
*
* (10/10/2001) gkh
* added vendor and product to serial structure. Needed to determine device
* owner when the device is disconnected.
*
* (05/30/2001) gkh
* added sem to port structure and removed port_lock
*
* (10/05/2000) gkh
* Added interrupt_in_endpointAddress and bulk_in_endpointAddress to help
* fix bug with urb->dev not being set properly, now that the usb core
* needs it.
*
* (09/11/2000) gkh
* Added usb_serial_debug_data function to help get rid of #DEBUG in the
* drivers.
*
* (08/28/2000) gkh
* Added port_lock to port structure.
*
* (08/08/2000) gkh
* Added open_count to port structure.
*
* (07/23/2000) gkh
* Added bulk_out_endpointAddress to port structure.
*
* (07/19/2000) gkh, pberger, and borchers
* Modifications to allow usb-serial drivers to be modules.
*
*
*/
#ifndef __LINUX_USB_SERIAL_H
#define __LINUX_USB_SERIAL_H
#include <linux/config.h>
#include <linux/kref.h>
#define SERIAL_TTY_MAJOR 188 /* Nice legal number now */
#define SERIAL_TTY_MINORS 255 /* loads of devices :) */
#define MAX_NUM_PORTS 8 /* The maximum number of ports one device can grab at once */
/* parity check flag */
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
/**
* usb_serial_port: structure for the specific ports of a device.
* @serial: pointer back to the struct usb_serial owner of this port.
* @tty: pointer to the corresponding tty for this port.
* @lock: spinlock to grab when updating portions of this structure.
* @number: the number of the port (the minor number).
* @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
* @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
* @interrupt_in_endpointAddress: endpoint address for the interrupt in pipe
* for this port.
* @interrupt_out_buffer: pointer to the interrupt out buffer for this port.
* @interrupt_out_size: the size of the interrupt_out_buffer, in bytes.
* @interrupt_out_urb: pointer to the interrupt out struct urb for this port.
* @interrupt_out_endpointAddress: endpoint address for the interrupt out pipe
* for this port.
* @bulk_in_buffer: pointer to the bulk in buffer for this port.
* @read_urb: pointer to the bulk in struct urb for this port.
* @bulk_in_endpointAddress: endpoint address for the bulk in pipe for this
* port.
* @bulk_out_buffer: pointer to the bulk out buffer for this port.
* @bulk_out_size: the size of the bulk_out_buffer, in bytes.
* @write_urb: pointer to the bulk out struct urb for this port.
* @bulk_out_endpointAddress: endpoint address for the bulk out pipe for this
* port.
* @write_wait: a wait_queue_head_t used by the port.
* @work: work queue entry for the line discipline waking up.
* @open_count: number of times this port has been opened.
*
* This structure is used by the usb-serial core and drivers for the specific
* ports of a device.
*/
struct usb_serial_port {
struct usb_serial * serial;
struct tty_struct * tty;
spinlock_t lock;
unsigned char number;
unsigned char * interrupt_in_buffer;
struct urb * interrupt_in_urb;
__u8 interrupt_in_endpointAddress;
unsigned char * interrupt_out_buffer;
int interrupt_out_size;
struct urb * interrupt_out_urb;
__u8 interrupt_out_endpointAddress;
unsigned char * bulk_in_buffer;
int bulk_in_size;
struct urb * read_urb;
__u8 bulk_in_endpointAddress;
unsigned char * bulk_out_buffer;
int bulk_out_size;
struct urb * write_urb;
int write_urb_busy;
__u8 bulk_out_endpointAddress;
wait_queue_head_t write_wait;
struct work_struct work;
int open_count;
struct device dev;
};
#define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev)
/* get and set the port private data pointer helper functions */
static inline void *usb_get_serial_port_data (struct usb_serial_port *port)
{
return dev_get_drvdata(&port->dev);
}
static inline void usb_set_serial_port_data (struct usb_serial_port *port, void *data)
{
dev_set_drvdata(&port->dev, data);
}
/**
* usb_serial - structure used by the usb-serial core for a device
* @dev: pointer to the struct usb_device for this device
* @type: pointer to the struct usb_serial_device_type for this device
* @interface: pointer to the struct usb_interface for this device
* @minor: the starting minor number for this device
* @num_ports: the number of ports this device has
* @num_interrupt_in: number of interrupt in endpoints we have
* @num_interrupt_out: number of interrupt out endpoints we have
* @num_bulk_in: number of bulk in endpoints we have
* @num_bulk_out: number of bulk out endpoints we have
* @port: array of struct usb_serial_port structures for the different ports.
* @private: place to put any driver specific information that is needed. The
* usb-serial driver is required to manage this data, the usb-serial core
* will not touch this. Use usb_get_serial_data() and
* usb_set_serial_data() to access this.
*/
struct usb_serial {
struct usb_device * dev;
struct usb_serial_device_type * type;
struct usb_interface * interface;
unsigned char minor;
unsigned char num_ports;
unsigned char num_port_pointers;
char num_interrupt_in;
char num_interrupt_out;
char num_bulk_in;
char num_bulk_out;
struct usb_serial_port * port[MAX_NUM_PORTS];
struct kref kref;
void * private;
};
#define to_usb_serial(d) container_of(d, struct usb_serial, kref)
#define NUM_DONT_CARE (-1)
/* get and set the serial private data pointer helper functions */
static inline void *usb_get_serial_data (struct usb_serial *serial)
{
return serial->private;
}
static inline void usb_set_serial_data (struct usb_serial *serial, void *data)
{
serial->private = data;
}
/**
* usb_serial_device_type - a structure that defines a usb serial device
* @owner: pointer to the module that owns this device.
* @name: pointer to a string that describes this device. This string used
* in the syslog messages when a device is inserted or removed.
* @short_name: a pointer to a string that describes this device in
* KOBJ_NAME_LEN characters or less. This is used for the sysfs interface
* to describe the driver.
* @id_table: pointer to a list of usb_device_id structures that define all
* of the devices this structure can support.
* @num_interrupt_in: the number of interrupt in endpoints this device will
* have.
* @num_interrupt_out: the number of interrupt out endpoints this device will
* have.
* @num_bulk_in: the number of bulk in endpoints this device will have.
* @num_bulk_out: the number of bulk out endpoints this device will have.
* @num_ports: the number of different ports this device will have.
* @calc_num_ports: pointer to a function to determine how many ports this
* device has dynamically. It will be called after the probe()
* callback is called, but before attach()
* @probe: pointer to the driver's probe function.
* This will be called when the device is inserted into the system,
* but before the device has been fully initialized by the usb_serial
* subsystem. Use this function to download any firmware to the device,
* or any other early initialization that might be needed.
* Return 0 to continue on with the initialization sequence. Anything
* else will abort it.
* @attach: pointer to the driver's attach function.
* This will be called when the struct usb_serial structure is fully set
* set up. Do any local initialization of the device, or any private
* memory structure allocation at this point in time.
* @shutdown: pointer to the driver's shutdown function. This will be
* called when the device is removed from the system.
*
* This structure is defines a USB Serial device. It provides all of
* the information that the USB serial core code needs. If the function
* pointers are defined, then the USB serial core code will call them when
* the corresponding tty port functions are called. If they are not
* called, the generic serial function will be used instead.
*/
struct usb_serial_device_type {
struct module *owner;
char *name;
char *short_name;
const struct usb_device_id *id_table;
char num_interrupt_in;
char num_interrupt_out;
char num_bulk_in;
char num_bulk_out;
char num_ports;
struct list_head driver_list;
struct device_driver driver;
int (*probe) (struct usb_serial *serial, const struct usb_device_id *id);
int (*attach) (struct usb_serial *serial);
int (*calc_num_ports) (struct usb_serial *serial);
void (*shutdown) (struct usb_serial *serial);
int (*port_probe) (struct usb_serial_port *port);
int (*port_remove) (struct usb_serial_port *port);
/* serial function calls */
int (*open) (struct usb_serial_port *port, struct file * filp);
void (*close) (struct usb_serial_port *port, struct file * filp);
int (*write) (struct usb_serial_port *port, const unsigned char *buf, int count);
int (*write_room) (struct usb_serial_port *port);
int (*ioctl) (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
void (*set_termios) (struct usb_serial_port *port, struct termios * old);
void (*break_ctl) (struct usb_serial_port *port, int break_state);
int (*chars_in_buffer) (struct usb_serial_port *port);
void (*throttle) (struct usb_serial_port *port);
void (*unthrottle) (struct usb_serial_port *port);
int (*tiocmget) (struct usb_serial_port *port, struct file *file);
int (*tiocmset) (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
void (*read_int_callback)(struct urb *urb, struct pt_regs *regs);
void (*write_int_callback)(struct urb *urb, struct pt_regs *regs);
void (*read_bulk_callback)(struct urb *urb, struct pt_regs *regs);
void (*write_bulk_callback)(struct urb *urb, struct pt_regs *regs);
};
#define to_usb_serial_driver(d) container_of(d, struct usb_serial_device_type, driver)
extern int usb_serial_register(struct usb_serial_device_type *new_device);
extern void usb_serial_deregister(struct usb_serial_device_type *device);
extern void usb_serial_port_softint(void *private);
extern int usb_serial_probe(struct usb_interface *iface, const struct usb_device_id *id);
extern void usb_serial_disconnect(struct usb_interface *iface);
extern int ezusb_writememory (struct usb_serial *serial, int address, unsigned char *data, int length, __u8 bRequest);
extern int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit);
/* USB Serial console functions */
#ifdef CONFIG_USB_SERIAL_CONSOLE
extern void usb_serial_console_init (int debug, int minor);
extern void usb_serial_console_exit (void);
#else
static inline void usb_serial_console_init (int debug, int minor) { }
static inline void usb_serial_console_exit (void) { }
#endif
/* Functions needed by other parts of the usbserial core */
extern struct usb_serial *usb_serial_get_by_index (unsigned int minor);
extern int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp);
extern int usb_serial_generic_write (struct usb_serial_port *port, const unsigned char *buf, int count);
extern void usb_serial_generic_close (struct usb_serial_port *port, struct file *filp);
extern int usb_serial_generic_write_room (struct usb_serial_port *port);
extern int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port);
extern void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
extern void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
extern void usb_serial_generic_shutdown (struct usb_serial *serial);
extern int usb_serial_generic_register (int debug);
extern void usb_serial_generic_deregister (void);
extern int usb_serial_bus_register (struct usb_serial_device_type *device);
extern void usb_serial_bus_deregister (struct usb_serial_device_type *device);
extern struct usb_serial_device_type usb_serial_generic_device;
extern struct bus_type usb_serial_bus_type;
extern struct tty_driver *usb_serial_tty_driver;
static inline void usb_serial_debug_data(int debug,
struct device *dev,
const char *function, int size,
const unsigned char *data)
{
int i;
if (debug) {
dev_printk(KERN_DEBUG, dev, "%s - length = %d, data = ", function, size);
for (i = 0; i < size; ++i)
printk ("%.2x ", data[i]);
printk ("\n");
}
}
/* Use our own dbg macro */
#undef dbg
#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG "%s: " format "\n" , __FILE__ , ## arg); } while (0)
#endif /* ifdef __LINUX_USB_SERIAL_H */
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