usb-serial.h

宋宝华的《Linux设备驱动开发详解》第一版的源代码

/*
 * USB Serial Converter driver
 *
 *	Copyright (C) 1999 - 2005
 *	    Greg Kroah-Hartman ([e-mail])
 *
 *	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.
 *
 */


#ifndef __LINUX_USB_SERIAL_H
#define __LINUX_USB_SERIAL_H

#include <linux/config.h>
#include <linux/kref.h>
#include <asm/semaphore.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.
 * @sem: semaphore used to synchronize serial_open() and serial_close()
 *	access for this port.
 * @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;
	struct semaphore        sem;
	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_driver 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_driver *	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_driver - describes a usb serial driver
 * @description: pointer to a string that describes this driver.  This string used
 *	in the syslog messages when a device is inserted or removed.
 * @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 driver.  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.
 *
 * The driver.owner field should be set to the module owner of this driver.
 * The driver.name field should be set to the name of this driver (remember
 * it will show up in sysfs, so it needs to be short and to the point.
 * Useing the module name is a good idea.)
 */
struct usb_serial_driver {
	const char *description;
	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_driver, driver)

extern int  usb_serial_register(struct usb_serial_driver *driver);
extern void usb_serial_deregister(struct usb_serial_driver *driver);
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_driver *device);
extern void usb_serial_bus_deregister (struct usb_serial_driver *device);

extern struct usb_serial_driver 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 */