pl2303.c 30.4 KB
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/*
 * Prolific PL2303 USB to serial adaptor driver
 *
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 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
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 * Copyright (C) 2003 IBM Corp.
 *
 * Original driver for 2.2.x by anonymous
 *
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 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License version
 *	2 as published by the Free Software Foundation.
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 *
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 * See Documentation/usb/usb-serial.txt for more information on using this
 * driver
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 *
 */

#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/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include "pl2303.h"

/*
 * Version Information
 */
#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"

static int debug;

#define PL2303_CLOSING_WAIT	(30*HZ)

#define PL2303_BUF_SIZE		1024
#define PL2303_TMP_BUF_SIZE	1024

struct pl2303_buf {
	unsigned int	buf_size;
	char		*buf_buf;
	char		*buf_get;
	char		*buf_put;
};

static struct usb_device_id id_table [] = {
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
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	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
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	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
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	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
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	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
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	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
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	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
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	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
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	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
	{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
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	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
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	{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
	{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
	{ USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
	{ USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
	{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
	{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
	{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
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	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
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	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
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	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
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	{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
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	{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
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	{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
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	{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
	{ USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
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	{ USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
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	{ USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
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	{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
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	{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
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	{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
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	{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
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	{ USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
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	{ USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
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	{ USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
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	{ USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
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	{ USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
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	{ }					/* Terminating entry */
};

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MODULE_DEVICE_TABLE(usb, id_table);
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static struct usb_driver pl2303_driver = {
	.name =		"pl2303",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table,
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	.suspend =      usb_serial_suspend,
	.resume =       usb_serial_resume,
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	.no_dynamic_id = 	1,
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	.supports_autosuspend =	1,
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};

#define SET_LINE_REQUEST_TYPE		0x21
#define SET_LINE_REQUEST		0x20

#define SET_CONTROL_REQUEST_TYPE	0x21
#define SET_CONTROL_REQUEST		0x22
#define CONTROL_DTR			0x01
#define CONTROL_RTS			0x02

#define BREAK_REQUEST_TYPE		0x21
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#define BREAK_REQUEST			0x23
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#define BREAK_ON			0xffff
#define BREAK_OFF			0x0000

#define GET_LINE_REQUEST_TYPE		0xa1
#define GET_LINE_REQUEST		0x21

#define VENDOR_WRITE_REQUEST_TYPE	0x40
#define VENDOR_WRITE_REQUEST		0x01

#define VENDOR_READ_REQUEST_TYPE	0xc0
#define VENDOR_READ_REQUEST		0x01

#define UART_STATE			0x08
#define UART_STATE_TRANSIENT_MASK	0x74
#define UART_DCD			0x01
#define UART_DSR			0x02
#define UART_BREAK_ERROR		0x04
#define UART_RING			0x08
#define UART_FRAME_ERROR		0x10
#define UART_PARITY_ERROR		0x20
#define UART_OVERRUN_ERROR		0x40
#define UART_CTS			0x80


enum pl2303_type {
	type_0,		/* don't know the difference between type 0 and */
	type_1,		/* type 1, until someone from prolific tells us... */
	HX,		/* HX version of the pl2303 chip */
};

struct pl2303_private {
	spinlock_t lock;
	struct pl2303_buf *buf;
	int write_urb_in_use;
	wait_queue_head_t delta_msr_wait;
	u8 line_control;
	u8 line_status;
	enum pl2303_type type;
};

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/*
 * pl2303_buf_alloc
 *
 * Allocate a circular buffer and all associated memory.
 */
static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
{
	struct pl2303_buf *pb;

	if (size == 0)
		return NULL;

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	pb = kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
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	if (pb == NULL)
		return NULL;

	pb->buf_buf = kmalloc(size, GFP_KERNEL);
	if (pb->buf_buf == NULL) {
		kfree(pb);
		return NULL;
	}

	pb->buf_size = size;
	pb->buf_get = pb->buf_put = pb->buf_buf;

	return pb;
}

/*
 * pl2303_buf_free
 *
 * Free the buffer and all associated memory.
 */
static void pl2303_buf_free(struct pl2303_buf *pb)
{
	if (pb) {
		kfree(pb->buf_buf);
		kfree(pb);
	}
}

/*
 * pl2303_buf_clear
 *
 * Clear out all data in the circular buffer.
 */
static void pl2303_buf_clear(struct pl2303_buf *pb)
{
	if (pb != NULL)
		pb->buf_get = pb->buf_put;
		/* equivalent to a get of all data available */
}

/*
 * pl2303_buf_data_avail
 *
 * Return the number of bytes of data available in the circular
 * buffer.
 */
static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
{
	if (pb == NULL)
		return 0;

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	return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
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}

/*
 * pl2303_buf_space_avail
 *
 * Return the number of bytes of space available in the circular
 * buffer.
 */
static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
{
	if (pb == NULL)
		return 0;

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	return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
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}

/*
 * pl2303_buf_put
 *
 * Copy data data from a user buffer and put it into the circular buffer.
 * Restrict to the amount of space available.
 *
 * Return the number of bytes copied.
 */
static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
				   unsigned int count)
{
	unsigned int len;

	if (pb == NULL)
		return 0;

	len  = pl2303_buf_space_avail(pb);
	if (count > len)
		count = len;

	if (count == 0)
		return 0;

	len = pb->buf_buf + pb->buf_size - pb->buf_put;
	if (count > len) {
		memcpy(pb->buf_put, buf, len);
		memcpy(pb->buf_buf, buf+len, count - len);
		pb->buf_put = pb->buf_buf + count - len;
	} else {
		memcpy(pb->buf_put, buf, count);
		if (count < len)
			pb->buf_put += count;
		else /* count == len */
			pb->buf_put = pb->buf_buf;
	}

	return count;
}

/*
 * pl2303_buf_get
 *
 * Get data from the circular buffer and copy to the given buffer.
 * Restrict to the amount of data available.
 *
 * Return the number of bytes copied.
 */
static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
				   unsigned int count)
{
	unsigned int len;

	if (pb == NULL)
		return 0;

	len = pl2303_buf_data_avail(pb);
	if (count > len)
		count = len;

	if (count == 0)
		return 0;

	len = pb->buf_buf + pb->buf_size - pb->buf_get;
	if (count > len) {
		memcpy(buf, pb->buf_get, len);
		memcpy(buf+len, pb->buf_buf, count - len);
		pb->buf_get = pb->buf_buf + count - len;
	} else {
		memcpy(buf, pb->buf_get, count);
		if (count < len)
			pb->buf_get += count;
		else /* count == len */
			pb->buf_get = pb->buf_buf;
	}

	return count;
}
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static int pl2303_vendor_read(__u16 value, __u16 index,
		struct usb_serial *serial, unsigned char *buf)
{
	int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
			VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
			value, index, buf, 1, 100);
	dbg("0x%x:0x%x:0x%x:0x%x  %d - %x", VENDOR_READ_REQUEST_TYPE,
			VENDOR_READ_REQUEST, value, index, res, buf[0]);
	return res;
}

static int pl2303_vendor_write(__u16 value, __u16 index,
		struct usb_serial *serial)
{
	int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
			value, index, NULL, 0, 100);
	dbg("0x%x:0x%x:0x%x:0x%x  %d", VENDOR_WRITE_REQUEST_TYPE,
			VENDOR_WRITE_REQUEST, value, index, res);
	return res;
}

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static int pl2303_startup(struct usb_serial *serial)
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{
	struct pl2303_private *priv;
	enum pl2303_type type = type_0;
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	unsigned char *buf;
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	int i;

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	buf = kmalloc(10, GFP_KERNEL);
	if (buf == NULL)
		return -ENOMEM;

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	if (serial->dev->descriptor.bDeviceClass == 0x02)
		type = type_0;
	else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
		type = HX;
	else if (serial->dev->descriptor.bDeviceClass == 0x00)
		type = type_1;
	else if (serial->dev->descriptor.bDeviceClass == 0xFF)
		type = type_1;
	dbg("device type: %d", type);

	for (i = 0; i < serial->num_ports; ++i) {
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		priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
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		if (!priv)
			goto cleanup;
		spin_lock_init(&priv->lock);
		priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
		if (priv->buf == NULL) {
			kfree(priv);
			goto cleanup;
		}
		init_waitqueue_head(&priv->delta_msr_wait);
		priv->type = type;
		usb_set_serial_port_data(serial->port[i], priv);
	}
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	pl2303_vendor_read(0x8484, 0, serial, buf);
	pl2303_vendor_write(0x0404, 0, serial);
	pl2303_vendor_read(0x8484, 0, serial, buf);
	pl2303_vendor_read(0x8383, 0, serial, buf);
	pl2303_vendor_read(0x8484, 0, serial, buf);
	pl2303_vendor_write(0x0404, 1, serial);
	pl2303_vendor_read(0x8484, 0, serial, buf);
	pl2303_vendor_read(0x8383, 0, serial, buf);
	pl2303_vendor_write(0, 1, serial);
	pl2303_vendor_write(1, 0, serial);
	if (type == HX)
		pl2303_vendor_write(2, 0x44, serial);
	else
		pl2303_vendor_write(2, 0x24, serial);

	kfree(buf);
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	return 0;

cleanup:
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	kfree(buf);
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	for (--i; i >= 0; --i) {
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		priv = usb_get_serial_port_data(serial->port[i]);
		pl2303_buf_free(priv->buf);
		kfree(priv);
		usb_set_serial_port_data(serial->port[i], NULL);
	}
	return -ENOMEM;
}

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static int set_control_lines(struct usb_device *dev, u8 value)
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{
	int retval;
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	retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
				 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
				 value, 0, NULL, 0, 100);
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	dbg("%s - value = %d, retval = %d", __func__, value, retval);
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	return retval;
}

static void pl2303_send(struct usb_serial_port *port)
{
	int count, result;
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

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	dbg("%s - port %d", __func__, port->number);
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	spin_lock_irqsave(&priv->lock, flags);

	if (priv->write_urb_in_use) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}

	count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
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			       port->bulk_out_size);
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	if (count == 0) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return;
	}

	priv->write_urb_in_use = 1;

	spin_unlock_irqrestore(&priv->lock, flags);

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	usb_serial_debug_data(debug, &port->dev, __func__, count,
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			      port->write_urb->transfer_buffer);
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	port->write_urb->transfer_buffer_length = count;
	port->write_urb->dev = port->serial->dev;
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	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
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	if (result) {
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		dev_err(&port->dev, "%s - failed submitting write urb,"
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			" error %d\n", __func__, result);
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		priv->write_urb_in_use = 0;
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		/* TODO: reschedule pl2303_send */
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	}

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	usb_serial_port_softint(port);
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}

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static int pl2303_write(struct tty_struct *tty, struct usb_serial_port *port,
				const unsigned char *buf, int count)
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{
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;

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	dbg("%s - port %d, %d bytes", __func__, port->number, count);
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	if (!count)
		return count;

	spin_lock_irqsave(&priv->lock, flags);
	count = pl2303_buf_put(priv->buf, buf, count);
	spin_unlock_irqrestore(&priv->lock, flags);

	pl2303_send(port);

	return count;
}

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static int pl2303_write_room(struct tty_struct *tty)
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{
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	struct usb_serial_port *port = tty->driver_data;
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	struct pl2303_private *priv = usb_get_serial_port_data(port);
	int room = 0;
	unsigned long flags;

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	dbg("%s - port %d", __func__, port->number);
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	spin_lock_irqsave(&priv->lock, flags);
	room = pl2303_buf_space_avail(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

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	dbg("%s - returns %d", __func__, room);
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	return room;
}

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static int pl2303_chars_in_buffer(struct tty_struct *tty)
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{
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	struct usb_serial_port *port = tty->driver_data;
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	struct pl2303_private *priv = usb_get_serial_port_data(port);
	int chars = 0;
	unsigned long flags;

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	dbg("%s - port %d", __func__, port->number);
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	spin_lock_irqsave(&priv->lock, flags);
	chars = pl2303_buf_data_avail(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

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	dbg("%s - returns %d", __func__, chars);
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	return chars;
}

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static void pl2303_set_termios(struct tty_struct *tty,
		struct usb_serial_port *port, struct ktermios *old_termios)
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{
	struct usb_serial *serial = port->serial;
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int cflag;
	unsigned char *buf;
	int baud;
	int i;
	u8 control;

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	dbg("%s -  port %d", __func__, port->number);
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	/* The PL2303 is reported to lose bytes if you change
	   serial settings even to the same values as before. Thus
	   we actually need to filter in this specific case */

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	if (!tty_termios_hw_change(tty->termios, old_termios))
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		return;

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	cflag = tty->termios->c_cflag;
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	buf = kzalloc(7, GFP_KERNEL);
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	if (!buf) {
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		dev_err(&port->dev, "%s - out of memory.\n", __func__);
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		/* Report back no change occurred */
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		*tty->termios = *old_termios;
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		return;
	}

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	i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
			    GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
			    0, 0, buf, 7, 100);
	dbg("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
	    buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
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	if (cflag & CSIZE) {
		switch (cflag & CSIZE) {
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		case CS5:
			buf[6] = 5;
			break;
		case CS6:
			buf[6] = 6;
			break;
		case CS7:
			buf[6] = 7;
			break;
		default:
		case CS8:
			buf[6] = 8;
			break;
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		}
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		dbg("%s - data bits = %d", __func__, buf[6]);
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	}

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	baud = tty_get_baud_rate(tty);
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	dbg("%s - baud = %d", __func__, baud);
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	if (baud) {
		buf[0] = baud & 0xff;
		buf[1] = (baud >> 8) & 0xff;
		buf[2] = (baud >> 16) & 0xff;
		buf[3] = (baud >> 24) & 0xff;
	}

	/* For reference buf[4]=0 is 1 stop bits */
	/* For reference buf[4]=1 is 1.5 stop bits */
	/* For reference buf[4]=2 is 2 stop bits */
	if (cflag & CSTOPB) {
		buf[4] = 2;
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		dbg("%s - stop bits = 2", __func__);
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	} else {
		buf[4] = 0;
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		dbg("%s - stop bits = 1", __func__);
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	}

	if (cflag & PARENB) {
		/* For reference buf[5]=0 is none parity */
		/* For reference buf[5]=1 is odd parity */
		/* For reference buf[5]=2 is even parity */
		/* For reference buf[5]=3 is mark parity */
		/* For reference buf[5]=4 is space parity */
		if (cflag & PARODD) {
			buf[5] = 1;
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			dbg("%s - parity = odd", __func__);
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		} else {
			buf[5] = 2;
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			dbg("%s - parity = even", __func__);
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		}
	} else {
		buf[5] = 0;
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		dbg("%s - parity = none", __func__);
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	}

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	i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			    SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
			    0, 0, buf, 7, 100);
	dbg("0x21:0x20:0:0  %d", i);
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	/* change control lines if we are switching to or from B0 */
	spin_lock_irqsave(&priv->lock, flags);
	control = priv->line_control;
	if ((cflag & CBAUD) == B0)
		priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
	else
		priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
	if (control != priv->line_control) {
		control = priv->line_control;
		spin_unlock_irqrestore(&priv->lock, flags);
		set_control_lines(serial->dev, control);
	} else {
		spin_unlock_irqrestore(&priv->lock, flags);
	}
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	buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;

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	i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
			    GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
			    0, 0, buf, 7, 100);
	dbg("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
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	     buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);

	if (cflag & CRTSCTS) {
		if (priv->type == HX)
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			pl2303_vendor_write(0x0, 0x61, serial);
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		else
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			pl2303_vendor_write(0x0, 0x41, serial);
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	} else {
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		pl2303_vendor_write(0x0, 0x0, serial);
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	}
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	/* FIXME: Need to read back resulting baud rate */
	if (baud)
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		tty_encode_baud_rate(tty, baud, baud);
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	kfree(buf);
}

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static void pl2303_close(struct tty_struct *tty,
			struct usb_serial_port *port, struct file *filp)
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{
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int c_cflag;
	int bps;
	long timeout;
	wait_queue_t wait;

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	dbg("%s - port %d", __func__, port->number);
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	/* wait for data to drain from the buffer */
	spin_lock_irqsave(&priv->lock, flags);
	timeout = PL2303_CLOSING_WAIT;
	init_waitqueue_entry(&wait, current);
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	add_wait_queue(&tty->write_wait, &wait);
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	for (;;) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (pl2303_buf_data_avail(priv->buf) == 0 ||
		    timeout == 0 || signal_pending(current) ||
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		    port->serial->disconnected)
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			break;
		spin_unlock_irqrestore(&priv->lock, flags);
		timeout = schedule_timeout(timeout);
		spin_lock_irqsave(&priv->lock, flags);
	}
	set_current_state(TASK_RUNNING);
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	remove_wait_queue(&tty->write_wait, &wait);
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	/* clear out any remaining data in the buffer */
	pl2303_buf_clear(priv->buf);
	spin_unlock_irqrestore(&priv->lock, flags);

	/* wait for characters to drain from the device */
	/* (this is long enough for the entire 256 byte */
	/* pl2303 hardware buffer to drain with no flow */
	/* control for data rates of 1200 bps or more, */
	/* for lower rates we should really know how much */
	/* data is in the buffer to compute a delay */
	/* that is not unnecessarily long) */
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	bps = tty_get_baud_rate(tty);
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	if (bps > 1200)
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		timeout = max((HZ*2560)/bps, HZ/10);
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	else
		timeout = 2*HZ;
	schedule_timeout_interruptible(timeout);

	/* shutdown our urbs */
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	dbg("%s - shutting down urbs", __func__);
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	usb_kill_urb(port->write_urb);
	usb_kill_urb(port->read_urb);
	usb_kill_urb(port->interrupt_in_urb);

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	if (tty) {
		c_cflag = tty->termios->c_cflag;
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		if (c_cflag & HUPCL) {
			/* drop DTR and RTS */
			spin_lock_irqsave(&priv->lock, flags);
			priv->line_control = 0;
			spin_unlock_irqrestore(&priv->lock, flags);
			set_control_lines(port->serial->dev, 0);
		}
	}
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}

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static int pl2303_open(struct tty_struct *tty,
			struct usb_serial_port *port, struct file *filp)
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{
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	struct ktermios tmp_termios;
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	struct usb_serial *serial = port->serial;
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	int result;

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	dbg("%s -  port %d", __func__, port->number);
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	if (priv->type != HX) {
		usb_clear_halt(serial->dev, port->write_urb->pipe);
		usb_clear_halt(serial->dev, port->read_urb->pipe);
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	} else {
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		/* reset upstream data pipes */
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		pl2303_vendor_write(8, 0, serial);
		pl2303_vendor_write(9, 0, serial);
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	}

	/* Setup termios */
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	if (tty)
		pl2303_set_termios(tty, port, &tmp_termios);
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	/* FIXME: need to assert RTS and DTR if CRTSCTS off */
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	dbg("%s - submitting read urb", __func__);
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	port->read_urb->dev = serial->dev;
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	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
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	if (result) {
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		dev_err(&port->dev, "%s - failed submitting read urb,"
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			" error %d\n", __func__, result);
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		pl2303_close(tty, port, NULL);
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		return -EPROTO;
	}

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	dbg("%s - submitting interrupt urb", __func__);
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	port->interrupt_in_urb->dev = serial->dev;
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	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
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	if (result) {
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		dev_err(&port->dev, "%s - failed submitting interrupt urb,"
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			" error %d\n", __func__, result);
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		pl2303_close(tty, port, NULL);
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		return -EPROTO;
	}
	return 0;
}

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static int pl2303_tiocmset(struct tty_struct *tty, struct file *file,
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			   unsigned int set, unsigned int clear)
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{
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	struct usb_serial_port *port = tty->driver_data;
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	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	u8 control;

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	if (!usb_get_intfdata(port->serial->interface))
		return -ENODEV;

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	spin_lock_irqsave(&priv->lock, flags);
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	if (set & TIOCM_RTS)
		priv->line_control |= CONTROL_RTS;
	if (set & TIOCM_DTR)
		priv->line_control |= CONTROL_DTR;
	if (clear & TIOCM_RTS)
		priv->line_control &= ~CONTROL_RTS;
	if (clear & TIOCM_DTR)
		priv->line_control &= ~CONTROL_DTR;
	control = priv->line_control;
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	spin_unlock_irqrestore(&priv->lock, flags);
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	return set_control_lines(port->serial->dev, control);
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}

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static int pl2303_tiocmget(struct tty_struct *tty, struct file *file)
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{
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	struct usb_serial_port *port = tty->driver_data;
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	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int mcr;
	unsigned int status;
	unsigned int result;

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	dbg("%s (%d)", __func__, port->number);
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	if (!usb_get_intfdata(port->serial->interface))
		return -ENODEV;

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	spin_lock_irqsave(&priv->lock, flags);
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	mcr = priv->line_control;
	status = priv->line_status;
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	spin_unlock_irqrestore(&priv->lock, flags);
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	result = ((mcr & CONTROL_DTR)		? TIOCM_DTR : 0)
		  | ((mcr & CONTROL_RTS)	? TIOCM_RTS : 0)
		  | ((status & UART_CTS)	? TIOCM_CTS : 0)
		  | ((status & UART_DSR)	? TIOCM_DSR : 0)
		  | ((status & UART_RING)	? TIOCM_RI  : 0)
		  | ((status & UART_DCD)	? TIOCM_CD  : 0);

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	dbg("%s - result = %x", __func__, result);
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	return result;
}

static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
{
	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	unsigned int prevstatus;
	unsigned int status;
	unsigned int changed;

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	spin_lock_irqsave(&priv->lock, flags);
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	prevstatus = priv->line_status;
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	spin_unlock_irqrestore(&priv->lock, flags);
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	while (1) {
		interruptible_sleep_on(&priv->delta_msr_wait);
		/* see if a signal did it */
		if (signal_pending(current))
			return -ERESTARTSYS;
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		spin_lock_irqsave(&priv->lock, flags);
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		status = priv->line_status;
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		spin_unlock_irqrestore(&priv->lock, flags);

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		changed = prevstatus ^ status;
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		if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
		    ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
		    ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
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		    ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
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			return 0;
		}
		prevstatus = status;
	}
	/* NOTREACHED */
	return 0;
}

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static int pl2303_ioctl(struct tty_struct *tty, struct file *file,
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			unsigned int cmd, unsigned long arg)
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{
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	struct usb_serial_port *port = tty->driver_data;
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	dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
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	switch (cmd) {
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	case TIOCMIWAIT:
		dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
		return wait_modem_info(port, arg);
	default:
		dbg("%s not supported = 0x%04x", __func__, cmd);
		break;
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	}
	return -ENOIOCTLCMD;
}

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static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
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{
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	struct usb_serial_port *port = tty->driver_data;
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	struct usb_serial *serial = port->serial;
	u16 state;
	int result;

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	dbg("%s - port %d", __func__, port->number);
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	if (break_state == 0)
		state = BREAK_OFF;
	else
		state = BREAK_ON;
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	dbg("%s - turning break %s", __func__,
			state == BREAK_OFF ? "off" : "on");
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	result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
				 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
				 0, NULL, 0, 100);
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	if (result)
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		dbg("%s - error sending break = %d", __func__, result);
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}

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static void pl2303_shutdown(struct usb_serial *serial)
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{
	int i;
	struct pl2303_private *priv;

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	dbg("%s", __func__);
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	for (i = 0; i < serial->num_ports; ++i) {
		priv = usb_get_serial_port_data(serial->port[i]);
		if (priv) {
			pl2303_buf_free(priv->buf);
			kfree(priv);
			usb_set_serial_port_data(serial->port[i], NULL);
		}
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	}
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}

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static void pl2303_update_line_status(struct usb_serial_port *port,
				      unsigned char *data,
				      unsigned int actual_length)
{

	struct pl2303_private *priv = usb_get_serial_port_data(port);
	unsigned long flags;
	u8 status_idx = UART_STATE;
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	u8 length = UART_STATE + 1;
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	u16 idv, idp;
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	idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
	idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);


	if (idv == SIEMENS_VENDOR_ID) {
		if (idp == SIEMENS_PRODUCT_ID_X65 ||
		    idp == SIEMENS_PRODUCT_ID_SX1 ||
		    idp == SIEMENS_PRODUCT_ID_X75) {

			length = 1;
			status_idx = 0;
		}
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	}

	if (actual_length < length)
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		return;
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	/* Save off the uart status for others to look at */
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	spin_lock_irqsave(&priv->lock, flags);
	priv->line_status = data[status_idx];
	spin_unlock_irqrestore(&priv->lock, flags);
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	wake_up_interruptible(&priv->delta_msr_wait);
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}
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static void pl2303_read_int_callback(struct urb *urb)
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{
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	struct usb_serial_port *port =  urb->context;
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	unsigned char *data = urb->transfer_buffer;
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	unsigned int actual_length = urb->actual_length;
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	int status = urb->status;
	int retval;
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	dbg("%s (%d)", __func__, port->number);
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	switch (status) {
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	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
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		dbg("%s - urb shutting down with status: %d", __func__,
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		    status);
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		return;
	default:
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		dbg("%s - nonzero urb status received: %d", __func__,
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		    status);
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		goto exit;
	}

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	usb_serial_debug_data(debug, &port->dev, __func__,
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			      urb->actual_length, urb->transfer_buffer);

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	pl2303_update_line_status(port, data, actual_length);
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exit:
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	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
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		dev_err(&urb->dev->dev,
			"%s - usb_submit_urb failed with result %d\n",
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			__func__, retval);
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}

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static void pl2303_read_bulk_callback(struct urb *urb)
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{
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	struct usb_serial_port *port =  urb->context;
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	struct pl2303_private *priv = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	unsigned char *data = urb->transfer_buffer;
	unsigned long flags;
	int i;
	int result;
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