pl2303.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:20k
- /*
- * Prolific PL2303 USB to serial adaptor driver
- *
- * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
- *
- * 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 joe@bndlg.de 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/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/serial.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"
- #include "pl2303.h"
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v0.9"
- #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
- static __devinitdata 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) },
- { } /* 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 = {
- name: "PL-2303",
- id_table: id_table,
- needs_interrupt_in: DONT_CARE, /* this device must have an interrupt in endpoint */
- needs_bulk_in: MUST_HAVE, /* this device must have a bulk in endpoint */
- needs_bulk_out: MUST_HAVE, /* this device must have a bulk out endpoint */
- 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;
- };
- 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 (__FUNCTION__" - value = %d, retval = %d", 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 (__FUNCTION__ " - port %d, %d bytes", port->number, count);
- if (!port->tty) {
- err (__FUNCTION__ " - no tty???");
- return 0;
- }
- if (port->write_urb->status == -EINPROGRESS) {
- dbg (__FUNCTION__ " - already writing");
- 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(__FUNCTION__ " - failed submitting write urb, error %d", 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;
- unsigned int cflag;
- unsigned char *buf;
- int baud;
- int i;
- dbg (__FUNCTION__ " - port %d", port->number);
- if ((!port->tty) || (!port->tty->termios)) {
- dbg(__FUNCTION__" - no tty structures");
- return;
- }
- 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(__FUNCTION__ " - nothing to change...");
- return;
- }
- }
- buf = kmalloc (7, GFP_KERNEL);
- if (!buf) {
- err(__FUNCTION__ " - out of memory.");
- 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 (__FUNCTION__ " - data bits = %d", 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 = 300; 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 (__FUNCTION__ " - baud = %d", 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(__FUNCTION__ " - stop bits = 2");
- } else {
- buf[4] = 0;
- dbg(__FUNCTION__ " - stop bits = 1");
- }
- 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(__FUNCTION__ " - parity = odd");
- } else {
- buf[5] = 2;
- dbg(__FUNCTION__ " - parity = even");
- }
- } else {
- buf[5] = 0;
- dbg(__FUNCTION__ " - parity = none");
- }
- 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) {
- i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
- VENDOR_WRITE_REQUEST_TYPE, 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;
- 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) {
- port->active = 1;
- #define FISH(a,b,c,d)
- result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),
- b, a, c, d, buf, 1, 100);
- dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
- #define SOUP(a,b,c,d)
- result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),
- b, a, c, d, NULL, 0, 100);
- dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
- FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
- FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
- FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
- FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
- FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
- FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0xc0);
- SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 4);
- /* Setup termios */
- *(port->tty->termios) = tty_std_termios;
- port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- pl2303_set_termios (port, &tmp_termios);
- //FIXME: need to assert RTS and DTR if CRTSCTS off
- dbg (__FUNCTION__ " - submitting read urb");
- port->read_urb->dev = serial->dev;
- result = usb_submit_urb (port->read_urb);
- if (result) {
- err(__FUNCTION__ " - failed submitting read urb, error %d", result);
- up (&port->sem);
- pl2303_close (port, NULL);
- return -EPROTO;
- }
- dbg (__FUNCTION__ " - submitting interrupt urb");
- port->interrupt_in_urb->dev = serial->dev;
- result = usb_submit_urb (port->interrupt_in_urb);
- if (result) {
- err(__FUNCTION__ " - failed submitting interrupt urb, error %d", result);
- up (&port->sem);
- pl2303_close (port, NULL);
- return -EPROTO;
- }
- }
- up (&port->sem);
- return 0;
- }
- static void pl2303_close (struct usb_serial_port *port, struct file *filp)
- {
- struct usb_serial *serial;
- struct pl2303_private *priv;
- unsigned int c_cflag;
- int result;
- if (port_paranoia_check (port, __FUNCTION__))
- return;
- serial = get_usb_serial (port, __FUNCTION__);
- if (!serial)
- return;
-
- dbg (__FUNCTION__ " - port %d", port->number);
- down (&port->sem);
- --port->open_count;
- if (port->open_count <= 0) {
- if (serial->dev) {
- c_cflag = port->tty->termios->c_cflag;
- if (c_cflag & HUPCL) {
- /* drop DTR and RTS */
- priv = port->private;
- priv->line_control = 0;
- set_control_lines (port->serial->dev,
- priv->line_control);
- }
- /* shutdown our urbs */
- dbg (__FUNCTION__ " - shutting down urbs");
- result = usb_unlink_urb (port->write_urb);
- if (result)
- dbg (__FUNCTION__ " - usb_unlink_urb "
- "(write_urb) failed with reason: %d",
- result);
- result = usb_unlink_urb (port->read_urb);
- if (result)
- dbg (__FUNCTION__ " - usb_unlink_urb "
- "(read_urb) failed with reason: %d",
- result);
- result = usb_unlink_urb (port->interrupt_in_urb);
- if (result)
- dbg (__FUNCTION__ " - usb_unlink_urb "
- "(interrupt_in_urb) failed with reason: %d",
- result);
- }
- port->active = 0;
- port->open_count = 0;
- }
- up (&port->sem);
- MOD_DEC_USE_COUNT;
- }
- static int set_modem_info (struct usb_serial_port *port, unsigned int cmd, unsigned int *value)
- {
- struct pl2303_private *priv = port->private;
- unsigned int arg;
- if (copy_from_user(&arg, value, sizeof(int)))
- return -EFAULT;
- switch (cmd) {
- case TIOCMBIS:
- if (arg & TIOCM_RTS)
- priv->line_control |= CONTROL_RTS;
- if (arg & TIOCM_DTR)
- priv->line_control |= CONTROL_DTR;
- break;
- case TIOCMBIC:
- if (arg & TIOCM_RTS)
- priv->line_control &= ~CONTROL_RTS;
- if (arg & TIOCM_DTR)
- priv->line_control &= ~CONTROL_DTR;
- break;
- case TIOCMSET:
- /* turn off RTS and DTR and then only turn
- on what was asked to */
- priv->line_control &= ~(CONTROL_RTS | CONTROL_DTR);
- priv->line_control |= ((arg & TIOCM_RTS) ? CONTROL_RTS : 0);
- priv->line_control |= ((arg & TIOCM_DTR) ? CONTROL_DTR : 0);
- break;
- }
- return set_control_lines (port->serial->dev, priv->line_control);
- }
- static int get_modem_info (struct usb_serial_port *port, unsigned int *value)
- {
- struct pl2303_private *priv = port->private;
- unsigned int mcr = priv->line_control;
- unsigned int result;
- result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
- | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0);
- dbg (__FUNCTION__ " - result = %x", result);
- if (copy_to_user(value, &result, sizeof(int)))
- return -EFAULT;
- return 0;
- }
- static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
- {
- dbg (__FUNCTION__" (%d) cmd = 0x%04x", port->number, cmd);
- switch (cmd) {
-
- case TIOCMGET:
- dbg (__FUNCTION__" (%d) TIOCMGET", port->number);
- return get_modem_info (port, (unsigned int *)arg);
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMSET:
- dbg(__FUNCTION__" (%d) TIOCMSET/TIOCMBIC/TIOCMSET", port->number);
- return set_modem_info(port, cmd, (unsigned int *) arg);
- default:
- dbg (__FUNCTION__" not supported = 0x%04x", cmd);
- break;
- }
- return -ENOIOCTLCMD;
- }
- static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
- {
- struct usb_serial *serial = port->serial;
- u16 state;
- int result;
- dbg (__FUNCTION__ " - port %d", port->number);
- if (break_state == 0)
- state = BREAK_OFF;
- else
- state = BREAK_ON;
- dbg (__FUNCTION__" - turning break %s", state==BREAK_OFF ? "off" : "on");
- result = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
- BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
- 0, NULL, 0, 100);
- if (result)
- dbg (__FUNCTION__" - error sending break = %d", result);
- }
- static void pl2303_shutdown (struct usb_serial *serial)
- {
- int i;
- dbg (__FUNCTION__);
- /* stop everything on all ports */
- for (i = 0; i < serial->num_ports; ++i)
- while (serial->port[i].open_count > 0) {
- pl2303_close (&serial->port[i], NULL);
- kfree (serial->port[i].private);
- }
- }
- static void pl2303_read_int_callback (struct urb *urb)
- {
- struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
- struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
- //unsigned char *data = urb->transfer_buffer;
- //int i;
- //ints auto restart...
- if (!serial) {
- return;
- }
- if (urb->status) {
- urb->status = 0;
- return;
- }
- usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
- #if 0
- //FIXME need to update state of terminal lines variable
- #endif
- return;
- }
- static void pl2303_read_bulk_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 tty_struct *tty;
- unsigned char *data = urb->transfer_buffer;
- int i;
- int result;
- if (port_paranoia_check (port, __FUNCTION__))
- return;
- dbg(__FUNCTION__ " - port %d", port->number);
- if (!serial) {
- dbg(__FUNCTION__ " - bad serial pointer, exiting");
- return;
- }
- if (urb->status) {
- dbg (__FUNCTION__ " - urb->status = %d", urb->status);
- if (!port->active) {
- dbg (__FUNCTION__ " - port is closed, exiting.");
- return;
- }
- if (urb->status == -EPROTO) {
- /* PL2303 mysteriously fails with -EPROTO reschedule the read */
- dbg (__FUNCTION__ " - caught -EPROTO, resubmitting the urb");
- urb->status = 0;
- urb->dev = serial->dev;
- result = usb_submit_urb(urb);
- if (result)
- err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
- return;
- }
- dbg (__FUNCTION__ " - unable to handle the error, exiting.");
- return;
- }
- usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
- tty = port->tty;
- if (urb->actual_length) {
- for (i = 0; i < urb->actual_length; ++i) {
- if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
- tty_flip_buffer_push(tty);
- }
- tty_insert_flip_char (tty, data[i], 0);
- }
- tty_flip_buffer_push (tty);
- }
- /* Schedule the next read _if_ we are still open */
- if (port->active) {
- urb->dev = serial->dev;
- result = usb_submit_urb(urb);
- if (result)
- err(__FUNCTION__ " - failed resubmitting read urb, error %d", result);
- }
- return;
- }
- static void pl2303_write_bulk_callback (struct urb *urb)
- {
- struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
- int result;
- if (port_paranoia_check (port, __FUNCTION__))
- return;
-
- dbg(__FUNCTION__ " - port %d", port->number);
-
- if (urb->status) {
- /* error in the urb, so we have to resubmit it */
- if (serial_paranoia_check (port->serial, __FUNCTION__)) {
- return;
- }
- dbg (__FUNCTION__ " - Overflow in write");
- dbg (__FUNCTION__ " - nonzero write bulk status received: %d", urb->status);
- port->write_urb->transfer_buffer_length = 1;
- port->write_urb->dev = port->serial->dev;
- result = usb_submit_urb (port->write_urb);
- if (result)
- err(__FUNCTION__ " - failed resubmitting write urb, error %d", result);
- return;
- }
- queue_task(&port->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
- return;
- }
- static int __init pl2303_init (void)
- {
- usb_serial_register (&pl2303_device);
- info(DRIVER_DESC " " DRIVER_VERSION);
- return 0;
- }
- static void __exit pl2303_exit (void)
- {
- usb_serial_deregister (&pl2303_device);
- }
- module_init(pl2303_init);
- module_exit(pl2303_exit);
- MODULE_DESCRIPTION(DRIVER_DESC);
- MODULE_LICENSE("GPL");
- MODULE_PARM(debug, "i");
- MODULE_PARM_DESC(debug, "Debug enabled or not");