pl2303.c

linux下usb转换串口的驱动程序

/*
 * Prolific PL2303 USB to serial adaptor driver
 *
 * Copyright (C) 2001-2002 Greg Kroah-Hartman ([e-mail])
 *
 * Original driver for 2.2.x by anonymous
 *
 *	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
 *
 * 2001_Oct_06 gkh
 *	Added RTS and DTR line control.  Thanks to [e-mail] for parts of it.
 *
 * 2001_Sep_19 gkh
 *	Added break support.
 *
 * 2001_Aug_30 gkh
 *	fixed oops in write_bulk_callback.
 *
 * 2001_Aug_28 gkh
 *	reworked buffer logic to be like other usb-serial drivers.  Hopefully
 *	removing some reported problems.
 *
 * 2001_Jun_06 gkh
 *	finished porting to 2.4 format.
 *
 */

#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/serial.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 "pl2303.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.91"
#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"



static struct usb_device_id id_table [] = {
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
	{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
	{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
	{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
	{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
	{ }					/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table);


#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
#define BREAK_REQUEST			0x23	
#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

/* function prototypes for a PL2303 serial converter */
static int pl2303_open (struct usb_serial_port *port, struct file *filp);
static void pl2303_close (struct usb_serial_port *port, struct file *filp);
static void pl2303_set_termios (struct usb_serial_port *port,
				struct termios *old);
static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
			 unsigned int cmd, unsigned long arg);
static void pl2303_read_int_callback (struct urb *urb);
static void pl2303_read_bulk_callback (struct urb *urb);
static void pl2303_write_bulk_callback (struct urb *urb);
static int pl2303_write (struct usb_serial_port *port, int from_user,
			 const unsigned char *buf, int count);
static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
static int pl2303_startup (struct usb_serial *serial);
static void pl2303_shutdown (struct usb_serial *serial);


/* All of the device info needed for the PL2303 SIO serial converter */
static struct usb_serial_device_type pl2303_device = {
	.owner =		THIS_MODULE,
	.name =			"PL-2303",
	.id_table =		id_table,
	.num_interrupt_in =	NUM_DONT_CARE,
	.num_bulk_in =		1,
	.num_bulk_out =		1,
	.num_ports =		1,
	.open =			pl2303_open,
	.close =		pl2303_close,
	.write =		pl2303_write,
	.ioctl =		pl2303_ioctl,
	.break_ctl =		pl2303_break_ctl,
	.set_termios =		pl2303_set_termios,
	.read_bulk_callback =	pl2303_read_bulk_callback,
	.read_int_callback =	pl2303_read_int_callback,
	.write_bulk_callback =	pl2303_write_bulk_callback,
	.startup =		pl2303_startup,
	.shutdown =		pl2303_shutdown,
};

struct pl2303_private {
	u8 line_control;
	u8 termios_initialized;
	u8 driverType;
};


static int pl2303_startup (struct usb_serial *serial)
{
	struct pl2303_private *priv;
	int i;

	for (i = 0; i < serial->num_ports; ++i) {
		priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
		if (!priv)
			return -ENOMEM;
		memset (priv, 0x00, sizeof (struct pl2303_private));
		serial->port[i].private = priv;
	}
	return 0;
}

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

static int pl2303_write (struct usb_serial_port *port, int from_user,  const unsigned char *buf, int count)
{
	int result;

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

	if (port->write_urb->status == -EINPROGRESS) {
		dbg("%s - already writing", __FUNCTION__);
		return 0;
	}

	count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
	if (from_user) {
		if (copy_from_user (port->write_urb->transfer_buffer, buf, count))
			return -EFAULT;
	} else {
		memcpy (port->write_urb->transfer_buffer, buf, count);
	}
	
	usb_serial_debug_data (__FILE__, __FUNCTION__, count, port->write_urb->transfer_buffer);

	port->write_urb->transfer_buffer_length = count;
	port->write_urb->dev = port->serial->dev;
	result = usb_submit_urb (port->write_urb);
	if (result)
		err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
	else
		result = count;

	return result;
}



static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	struct usb_serial *serial = port->serial;
	struct pl2303_private *priv = port->private;
	unsigned int cflag;
	unsigned char *buf;
	int baud;
	int i;

	dbg("%s -  port %d, initialized = %d", __FUNCTION__, port->number,
	     ((struct pl2303_private *) port->private)->termios_initialized);

	if ((!port->tty) || (!port->tty->termios)) {
		dbg("%s - no tty structures", __FUNCTION__);
		return;
	}

	if (!(((struct pl2303_private *) port->private)->termios_initialized)) {
		*(port->tty->termios) = tty_std_termios;
		port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
		((struct pl2303_private *) port->private)->termios_initialized = 1;
	}
	cflag = port->tty->termios->c_cflag;
	/* check that they really want us to change something */
	if (old_termios) {
		if ((cflag == old_termios->c_cflag) &&
		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
		    dbg("%s - nothing to change...", __FUNCTION__);
		    return;
		}
	}

	buf = kmalloc (7, GFP_KERNEL);
	if (!buf) {
		err("%s - out of memory.", __FUNCTION__);
		return;
	}
	memset (buf, 0x00, 0x07);
	
	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]);


	i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
			     VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
			     0, 1, NULL, 0, 100);

	dbg ("0x40:1:0:1  %d", i);

	if (cflag & CSIZE) {
		switch (cflag & CSIZE) {
			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;
		}
		dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
	}

	baud = 0;
	switch (cflag & CBAUD) {
		case B0:	baud = 0;	break;
		case B75:	baud = 75;	break;
		case B150:	baud = 150;	break;
		case B300:	baud = 1228800;	break;
		case B600:	baud = 600;	break;
		case B1200:	baud = 1200;	break;
		case B1800:	baud = 1800;	break;
		case B2400:	baud = 2400;	break;
		case B4800:	baud = 4800;	break;
		case B9600:	baud = 9600;	break;
		case B19200:	baud = 19200;	break;
		case B38400:	baud = 38400;	break;
		case B57600:	baud = 57600;	break;
		case B115200:	baud = 115200;	break;
		case B230400:	baud = 230400;	break;
		case B460800:	baud = 460800;	break;
		default:
			err ("pl2303 driver does not support the baudrate requested (fix it)");
			break;
	}
	dbg("%s - baud = %d", __FUNCTION__, baud);
	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;
		dbg("%s - stop bits = 2", __FUNCTION__);
	} else {
		buf[4] = 0;
		dbg("%s - stop bits = 1", __FUNCTION__);
	}

	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;
			dbg("%s - parity = odd", __FUNCTION__);
		} else {
			buf[5] = 2;
			dbg("%s - parity = even", __FUNCTION__);
		}
	} else {
		buf[5] = 0;
		dbg("%s - parity = none", __FUNCTION__);
	}

	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);

	if (cflag && CBAUD) {
		priv = port->private;
		if ((cflag && CBAUD) == B0)
			priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
		else
			priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
		set_control_lines (serial->dev, priv->line_control);
	}
	
	buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;

	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]);

	if (cflag & CRTSCTS) {
		if(priv->driverType == 2) {
			i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
			    VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 0x0, 0x61, NULL, 0, 100);
			dbg ("0x40:0x1:0x0:0x61  %d", i);
		} else {
			i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
			    VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 0x0, 0x41, NULL, 0, 100);
			dbg ("0x40:0x1:0x0:0x41  %d", i);
		}
	}

	kfree (buf);
}


static int pl2303_open (struct usb_serial_port *port, struct file *filp)
{
	struct termios tmp_termios;
	struct usb_serial *serial = port->serial;
	unsigned char buf[10];
	int result;
	struct pl2303_private *priv = port->private;

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