whiteheat.c

linux2.4.20下的针对三星公司的s3c2410的usb模块驱动代码

/*
 * USB ConnectTech WhiteHEAT driver
 *
 *	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; 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
 *
 * (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.
 * 
 * 2001_Mar_19 gkh
 *	Fixed MOD_INC and MOD_DEC logic, the ability to open a port more 
 *	than once, and the got the proper usb_device_id table entries so
 *	the driver works again.
 *
 * (11/01/2000) Adam J. Richter
 *	usb_device_id table support
 * 
 * (10/05/2000) gkh
 *	Fixed bug with urb->dev not being set properly, now that the usb
 *	core needs it.
 * 
 * (10/03/2000) smd
 *	firmware is improved to guard against crap sent to device
 *	firmware now replies CMD_FAILURE on bad things
 *	read_callback fix you provided for private info struct
 *	command_finished now indicates success or fail
 *	setup_port struct now packed to avoid gcc padding
 *	firmware uses 1 based port numbering, driver now handles that
 *
 * (09/11/2000) gkh
 *	Removed DEBUG #ifdefs with call to usb_serial_debug_data
 *
 * (07/19/2000) gkh
 *	Added module_init and module_exit functions to handle the fact that this
 *	driver is a loadable module now.
 *	Fixed bug with port->minor that was found by Al Borchers
 *
 * (07/04/2000) gkh
 *	Added support for port settings. Baud rate can now be changed. Line signals
 *	are not transferred to and from the tty layer yet, but things seem to be 
 *	working well now.
 *
 * (05/04/2000) gkh
 *	First cut at open and close commands. Data can flow through the ports at
 *	default speeds now.
 *
 * (03/26/2000) gkh
 *	Split driver up into device specific pieces.
 * 
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>

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

#include "usb-serial.h"
#include "whiteheat_fw.h"		/* firmware for the ConnectTech WhiteHEAT device */
#include "whiteheat.h"			/* WhiteHEAT specific commands */

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.2"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <[e-mail]>"
#define DRIVER_DESC "USB ConnectTech WhiteHEAT driver"

#define CONNECT_TECH_VENDOR_ID		0x0710
#define CONNECT_TECH_FAKE_WHITE_HEAT_ID	0x0001
#define CONNECT_TECH_WHITE_HEAT_ID	0x8001

/*
   ID tables for whiteheat are unusual, because we want to different
   things for different versions of the device.  Eventually, this
   will be doable from a single table.  But, for now, we define two
   separate ID tables, and then a third table that combines them
   just for the purpose of exporting the autoloading information.
*/
static struct usb_device_id id_table_std [] = {
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
	{ }						/* Terminating entry */
};

static struct usb_device_id id_table_prerenumeration [] = {
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
	{ }						/* Terminating entry */
};

static __devinitdata struct usb_device_id id_table_combined [] = {
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
	{ USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table_combined);

/* function prototypes for the Connect Tech WhiteHEAT serial converter */
static int  whiteheat_open		(struct usb_serial_port *port, struct file *filp);
static void whiteheat_close		(struct usb_serial_port *port, struct file *filp);
static int  whiteheat_ioctl		(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void whiteheat_set_termios	(struct usb_serial_port *port, struct termios * old);
static void whiteheat_throttle		(struct usb_serial_port *port);
static void whiteheat_unthrottle	(struct usb_serial_port *port);
static int  whiteheat_fake_startup	(struct usb_serial *serial);
static int  whiteheat_real_startup	(struct usb_serial *serial);
static void whiteheat_real_shutdown	(struct usb_serial *serial);

static struct usb_serial_device_type whiteheat_fake_device = {
	.owner =		THIS_MODULE,
	.name =			"Connect Tech - WhiteHEAT - (prerenumeration)",
	.id_table =		id_table_prerenumeration,
	.num_interrupt_in =	NUM_DONT_CARE,
	.num_bulk_in =		NUM_DONT_CARE,
	.num_bulk_out =		NUM_DONT_CARE,
	.num_ports =		1,
	.startup =		whiteheat_fake_startup,
};

static struct usb_serial_device_type whiteheat_device = {
	.owner =		THIS_MODULE,
	.name =			"Connect Tech - WhiteHEAT",
	.id_table =		id_table_std,
	.num_interrupt_in =	NUM_DONT_CARE,
	.num_bulk_in =		NUM_DONT_CARE,
	.num_bulk_out =		NUM_DONT_CARE,
	.num_ports =		4,
	.open =			whiteheat_open,
	.close =		whiteheat_close,
	.throttle =		whiteheat_throttle,
	.unthrottle =		whiteheat_unthrottle,
	.ioctl =		whiteheat_ioctl,
	.set_termios =		whiteheat_set_termios,
	.startup =		whiteheat_real_startup,
	.shutdown =		whiteheat_real_shutdown,
};

struct whiteheat_private {
	__u8			command_finished;
	wait_queue_head_t	wait_command;	/* for handling sleeping while waiting for a command to finish */
};


/* local function prototypes */
static inline void set_rts	(struct usb_serial_port *port, unsigned char rts);
static inline void set_dtr	(struct usb_serial_port *port, unsigned char dtr);
static inline void set_break	(struct usb_serial_port *port, unsigned char brk);



#define COMMAND_PORT		4
#define COMMAND_TIMEOUT		(2*HZ)	/* 2 second timeout for a command */

/*****************************************************************************
 * Connect Tech's White Heat specific driver functions
 *****************************************************************************/
static void command_port_write_callback (struct urb *urb)
{
	dbg("%s", __FUNCTION__);

	if (urb->status) {
		dbg ("nonzero urb status: %d", urb->status);
		return;
	}

	usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, urb->transfer_buffer);

	return;
}


static void command_port_read_callback (struct urb *urb)
{
	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
	struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
	struct whiteheat_private *info;
	unsigned char *data = urb->transfer_buffer;
	int result;

	dbg("%s", __FUNCTION__);

	if (urb->status) {
		dbg("%s - nonzero urb status: %d", __FUNCTION__, urb->status);
		return;
	}

	if (!serial) {
		dbg("%s - bad serial pointer, exiting", __FUNCTION__);
		return;
	}
	
	usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);

	info = (struct whiteheat_private *)port->private;
	if (!info) {
		dbg("%s - info is NULL, exiting.", __FUNCTION__);
		return;
	}

	/* right now, if the command is COMMAND_COMPLETE, just flip the bit saying the command finished */
	/* in the future we're going to have to pay attention to the actual command that completed */
	if (data[0] == WHITEHEAT_CMD_COMPLETE) {
		info->command_finished = WHITEHEAT_CMD_COMPLETE;
		wake_up_interruptible(&info->wait_command);
	}
	
	if (data[0] == WHITEHEAT_CMD_FAILURE) {
		info->command_finished = WHITEHEAT_CMD_FAILURE;
		wake_up_interruptible(&info->wait_command);
	}
	
	/* Continue trying to always read */
	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,
		      command_port_read_callback, port);
	result = usb_submit_urb(port->read_urb);
	if (result)
		dbg("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
}


static int whiteheat_send_cmd (struct usb_serial *serial, __u8 command, __u8 *data, __u8 datasize)
{
	struct whiteheat_private *info;
	struct usb_serial_port *port;
	int timeout;
	__u8 *transfer_buffer;
	int retval = 0;

	dbg("%s - command %d", __FUNCTION__, command);

	port = &serial->port[COMMAND_PORT];
	info = (struct whiteheat_private *)port->private;
	info->command_finished = FALSE;
	
	transfer_buffer = (__u8 *)port->write_urb->transfer_buffer;
	transfer_buffer[0] = command;
	memcpy (&transfer_buffer[1], data, datasize);
	port->write_urb->transfer_buffer_length = datasize + 1;
	port->write_urb->dev = serial->dev;
	retval = usb_submit_urb (port->write_urb);
	if (retval) {
		dbg("%s - submit urb failed", __FUNCTION__);
		goto exit;
	}

	/* wait for the command to complete */
	timeout = COMMAND_TIMEOUT;
	while (timeout && (info->command_finished == FALSE)) {
		timeout = interruptible_sleep_on_timeout (&info->wait_command, timeout);
	}

	if (info->command_finished == FALSE) {
		dbg("%s - command timed out.", __FUNCTION__);
		retval = -ETIMEDOUT;
		goto exit;
	}

	if (info->command_finished == WHITEHEAT_CMD_FAILURE) {
		dbg("%s - command failed.", __FUNCTION__);
		retval = -EIO;
		goto exit;
	}

	if (info->command_finished == WHITEHEAT_CMD_COMPLETE)
		dbg("%s - command completed.", __FUNCTION__);

exit:
	return retval;
}


static int whiteheat_open (struct usb_serial_port *port, struct file *filp)
{
	struct whiteheat_min_set	open_command;
	struct usb_serial_port 		*command_port;
	struct whiteheat_private	*info;
	int				retval = 0;

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

	/* set up some stuff for our command port */
	command_port = &port->serial->port[COMMAND_PORT];
	if (command_port->private == NULL) {
		info = (struct whiteheat_private *)kmalloc (sizeof(struct whiteheat_private), GFP_KERNEL);
		if (info == NULL) {
			err("%s - out of memory", __FUNCTION__);
			retval = -ENOMEM;
			goto exit;
		}
		
		init_waitqueue_head(&info->wait_command);
		command_port->private = info;
		command_port->write_urb->complete = command_port_write_callback;
		command_port->read_urb->complete = command_port_read_callback;
		command_port->read_urb->dev = port->serial->dev;
		command_port->tty = port->tty;		/* need this to "fake" our our sanity check macros */
		retval = usb_submit_urb (command_port->read_urb);
		if (retval) {
			err("%s - failed submitting read urb, error %d", __FUNCTION__, retval);
			goto exit;
		}
	}
	
	/* Start reading from the device */
	port->read_urb->dev = port->serial->dev;
	retval = usb_submit_urb(port->read_urb);
	if (retval) {
		err("%s - failed submitting read urb, error %d", __FUNCTION__, retval);
		goto exit;
	}

	/* send an open port command */
	/* firmware uses 1 based port numbering */
	open_command.port = port->number - port->serial->minor + 1;
	retval = whiteheat_send_cmd (port->serial, WHITEHEAT_OPEN, (__u8 *)&open_command, sizeof(open_command));
	if (retval)
		goto exit;

	/* Need to do device specific setup here (control lines, baud rate, etc.) */
	/* FIXME!!! */

exit:
	dbg("%s - exit, retval = %d", __FUNCTION__, retval);
	return retval;
}