empeg.c

基于S3CEB2410平台LINUX操作系统下 USB驱动源代码

/*
 * USB Empeg empeg-car player driver
 *
 *	Copyright (C) 2000, 2001
 *	    Gary Brubaker ([e-mail])
 *
 *	Copyright (C) 1999 - 2001
 *	    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, version 2.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this driver
 * 
 * (07/16/2001) gb
 *	remove unused code in empeg_close() (thanks to Oliver Neukum for pointing this
 *	out) and rewrote empeg_set_termios().
 * 
 * (05/30/2001) gkh
 *	switched from using spinlock to a semaphore, which fixes lots of problems.
 *
 * (04/08/2001) gb
 *      Identify version on module load.
 * 
 * (01/22/2001) gb
 *	Added write_room() and chars_in_buffer() support. 
 * 
 * (12/21/2000) gb
 *	Moved termio stuff inside the port->active check.
 *	Moved MOD_DEC_USE_COUNT to end of empeg_close().
 * 
 * (12/03/2000) gb
 *	Added port->tty->ldisc.set_termios(port->tty, NULL) to empeg_open()
 *	This notifies the tty driver that the termios have changed.
 * 
 * (11/13/2000) gb
 *	Moved tty->low_latency = 1 from empeg_read_bulk_callback() to empeg_open()
 *	(It only needs to be set once - Doh!)
 * 
 * (11/11/2000) gb
 *	Updated to work with id_table structure.
 * 
 * (11/04/2000) gb
 *	Forked this from visor.c, and hacked it up to work with an
 *	Empeg ltd. empeg-car player.  Constructive criticism welcomed.
 *	I would like to say, 'Thank You' to Greg Kroah-Hartman for the
 *	use of his code, and for his guidance, advice and patience. :)
 *	A 'Thank You' is in order for John Ripley of Empeg ltd for his
 *	advice, and patience too.
 * 
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/usb.h>

#ifdef CONFIG_USB_SERIAL_DEBUG
	static int debug = 1;
#else
	static int debug;
#endif

#include "usb-serial.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.2"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <[e-mail]>, Gary Brubaker <[e-mail]>"
#define DRIVER_DESC "USB Empeg Mark I/II Driver"

#define EMPEG_VENDOR_ID			0x084f
#define EMPEG_PRODUCT_ID		0x0001

/* function prototypes for an empeg-car player */
static int  empeg_open			(struct usb_serial_port *port, struct file *filp);
static void empeg_close			(struct usb_serial_port *port, struct file *filp);
static int  empeg_write			(struct usb_serial_port *port,
					int from_user,
					const unsigned char *buf,
					int count);
static int  empeg_write_room		(struct usb_serial_port *port);
static int  empeg_chars_in_buffer	(struct usb_serial_port *port);
static void empeg_throttle		(struct usb_serial_port *port);
static void empeg_unthrottle		(struct usb_serial_port *port);
static int  empeg_startup		(struct usb_serial *serial);
static void empeg_shutdown		(struct usb_serial *serial);
static int  empeg_ioctl			(struct usb_serial_port *port,
					struct file * file,
					unsigned int cmd,
					unsigned long arg);
static void empeg_set_termios		(struct usb_serial_port *port, struct termios *old_termios);
static void empeg_write_bulk_callback	(struct urb *urb);
static void empeg_read_bulk_callback	(struct urb *urb);

static __devinitdata struct usb_device_id id_table [] = {
	{ USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) },
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table);

static struct usb_serial_device_type empeg_device = {
	name:			"Empeg",
	id_table:		id_table,
	needs_interrupt_in:	MUST_HAVE_NOT,	/* must not have an interrupt in endpoint */
	needs_bulk_in:		MUST_HAVE,	/* must have a bulk in endpoint */
	needs_bulk_out:		MUST_HAVE,	/* must have a bulk out endpoint */
	num_interrupt_in:	0,
	num_bulk_in:		1,
	num_bulk_out:		1,
	num_ports:		1,
	open:			empeg_open,
	close:			empeg_close,
	throttle:		empeg_throttle,
	unthrottle:		empeg_unthrottle,
	startup:		empeg_startup,
	shutdown:		empeg_shutdown,
	ioctl:			empeg_ioctl,
	set_termios:		empeg_set_termios,
	write:			empeg_write,
	write_room:		empeg_write_room,
	chars_in_buffer:	empeg_chars_in_buffer,
	write_bulk_callback:	empeg_write_bulk_callback,
	read_bulk_callback:	empeg_read_bulk_callback,
};

#define NUM_URBS			16
#define URB_TRANSFER_BUFFER_SIZE	4096

static struct urb	*write_urb_pool[NUM_URBS];
static spinlock_t	write_urb_pool_lock;
static int		bytes_in;
static int		bytes_out;

/******************************************************************************
 * Empeg specific driver functions
 ******************************************************************************/
static int empeg_open (struct usb_serial_port *port, struct file *filp)
{
	struct usb_serial *serial = port->serial;
	int result = 0;;

	if (port_paranoia_check (port, __FUNCTION__))
		return -ENODEV;

	dbg(__FUNCTION__ " - port %d", port->number);

	down (&port->sem);

	++port->open_count;
	MOD_INC_USE_COUNT;

	if (!port->active) {

		/* Force default termio settings */
		empeg_set_termios (port, NULL) ;

		port->active = 1;
		bytes_in = 0;
		bytes_out = 0;

		/* Start reading from the device */
		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,
			empeg_read_bulk_callback,
			port);

		port->read_urb->transfer_flags |= USB_QUEUE_BULK;

		result = usb_submit_urb(port->read_urb);

		if (result)
			err(__FUNCTION__ " - failed submitting read urb, error %d", result);

	}

	up (&port->sem);

	return result;
}


static void empeg_close (struct usb_serial_port *port, struct file * filp)
{
	struct usb_serial *serial;

	if (port_paranoia_check (port, __FUNCTION__))
		return;

	dbg(__FUNCTION__ " - port %d", port->number);

	serial = get_usb_serial (port, __FUNCTION__);
	if (!serial)
		return;

	down (&port->sem);

	--port->open_count;

	if (port->open_count <= 0) {
		if (serial->dev) {
			/* shutdown our bulk read */
			usb_unlink_urb (port->read_urb);
		}
		port->active = 0;
		port->open_count = 0;
	}

	up (&port->sem);

	/* Uncomment the following line if you want to see some statistics in your syslog */
	/* info ("Bytes In = %d  Bytes Out = %d", bytes_in, bytes_out); */

	MOD_DEC_USE_COUNT;
}


static int empeg_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count)
{
	struct usb_serial *serial = port->serial;
	struct urb *urb;
	const unsigned char *current_position = buf;
	unsigned long flags;
	int status;
	int i;
	int bytes_sent = 0;
	int transfer_size;

	dbg(__FUNCTION__ " - port %d", port->number);

	usb_serial_debug_data (__FILE__, __FUNCTION__, count, buf);

	while (count > 0) {

		/* try to find a free urb in our list of them */
		urb = NULL;

		spin_lock_irqsave (&write_urb_pool_lock, flags);

		for (i = 0; i < NUM_URBS; ++i) {
			if (write_urb_pool[i]->status != -EINPROGRESS) {
				urb = write_urb_pool[i];
				break;
			}
		}

		spin_unlock_irqrestore (&write_urb_pool_lock, flags);

		if (urb == NULL) {
			dbg (__FUNCTION__ " - no more free urbs");
			goto exit;
		}

		if (urb->transfer_buffer == NULL) {
			urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
			if (urb->transfer_buffer == NULL) {
				err(__FUNCTION__" no more kernel memory...");
				goto exit;
			}
		}

		transfer_size = min (count, URB_TRANSFER_BUFFER_SIZE);

		if (from_user) {
			if (copy_from_user (urb->transfer_buffer, current_position, transfer_size)) {
				bytes_sent = -EFAULT;
				break;
			}
		} else {
			memcpy (urb->transfer_buffer, current_position, transfer_size);
		}

		/* build up our urb */
		FILL_BULK_URB (
			urb,
			serial->dev,
			usb_sndbulkpipe(serial->dev,
				port->bulk_out_endpointAddress), 
			urb->transfer_buffer,
			transfer_size,
			empeg_write_bulk_callback,
			port);

		urb->transfer_flags |= USB_QUEUE_BULK;

		/* send it down the pipe */
		status = usb_submit_urb(urb);
		if (status) {
			err(__FUNCTION__ " - usb_submit_urb(write bulk) failed with status = %d", status);
			bytes_sent = status;
			break;
		}

		current_position += transfer_size;
		bytes_sent += transfer_size;
		count -= transfer_size;
		bytes_out += transfer_size;

	}

exit:
	return bytes_sent;

} 


static int empeg_write_room (struct usb_serial_port *port)
{
	unsigned long flags;
	int i;
	int room = 0;

	dbg(__FUNCTION__ " - port %d", port->number);

	spin_lock_irqsave (&write_urb_pool_lock, flags);

	/* tally up the number of bytes available */
	for (i = 0; i < NUM_URBS; ++i) {
		if (write_urb_pool[i]->status != -EINPROGRESS) {