drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2003 IBM Corp.
   6  *
   7  * Original driver for 2.2.x by anonymous
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  * See Documentation/usb/usb-serial.txt for more information on using this driver
  15  *
  16  * 2002_Mar_26 gkh
  17  *      allowed driver to work properly if there is no tty assigned to a port
  18  *      (this happens for serial console devices.)
  19  *
  20  * 2001_Oct_06 gkh
  21  *      Added RTS and DTR line control.  Thanks to joe@bndlg.de for parts of it.
  22  *
  23  * 2001_Sep_19 gkh
  24  *      Added break support.
  25  *
  26  * 2001_Aug_30 gkh
  27  *      fixed oops in write_bulk_callback.
  28  *
  29  * 2001_Aug_28 gkh
  30  *      reworked buffer logic to be like other usb-serial drivers.  Hopefully
  31  *      removing some reported problems.
  32  *
  33  * 2001_Jun_06 gkh
  34  *      finished porting to 2.4 format.
  35  *
  36  */
  37
  38 #include <linux/config.h>
  39 #include <linux/kernel.h>
  40 #include <linux/errno.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/tty.h>
  44 #include <linux/tty_driver.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/module.h>
  48 #include <linux/moduleparam.h>
  49 #include <linux/spinlock.h>
  50 #include <asm/uaccess.h>
  51 #include <linux/usb.h>
  52 #include "usb-serial.h"
  53 #include "pl2303.h"
  54
  55 /*
  56  * Version Information
  57  */
  58 #define DRIVER_VERSION "v0.12"
  59 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  60
  61 static int debug;
  62
  63 #define PL2303_CLOSING_WAIT     (30*HZ)
  64
  65 #define PL2303_BUF_SIZE         1024
  66 #define PL2303_TMP_BUF_SIZE     1024
  67
  68 static DECLARE_MUTEX(pl2303_tmp_buf_sem);
  69
  70 struct pl2303_buf {
  71         unsigned int    buf_size;
  72         char            *buf_buf;
  73         char            *buf_get;
  74         char            *buf_put;
  75 };
  76
  77 static struct usb_device_id id_table [] = {
  78         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  79         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  80         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  81         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  82         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  83         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  84         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  85         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  86         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  87         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  88         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  89         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  90         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  91         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  92         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  93         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  94         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  95         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  96         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  97         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  98         { USB_DEVICE( NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID ) },
  99         { }                                     /* Terminating entry */
 100 };
 101
 102 MODULE_DEVICE_TABLE (usb, id_table);
 103
 104 static struct usb_driver pl2303_driver = {
 105         .owner =        THIS_MODULE,
 106         .name =         "pl2303",
 107         .probe =        usb_serial_probe,
 108         .disconnect =   usb_serial_disconnect,
 109         .id_table =     id_table,
 110 };
 111
 112 #define SET_LINE_REQUEST_TYPE           0x21
 113 #define SET_LINE_REQUEST                0x20
 114
 115 #define SET_CONTROL_REQUEST_TYPE        0x21
 116 #define SET_CONTROL_REQUEST             0x22
 117 #define CONTROL_DTR                     0x01
 118 #define CONTROL_RTS                     0x02
 119
 120 #define BREAK_REQUEST_TYPE              0x21
 121 #define BREAK_REQUEST                   0x23
 122 #define BREAK_ON                        0xffff
 123 #define BREAK_OFF                       0x0000
 124
 125 #define GET_LINE_REQUEST_TYPE           0xa1
 126 #define GET_LINE_REQUEST                0x21
 127
 128 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 129 #define VENDOR_WRITE_REQUEST            0x01
 130
 131 #define VENDOR_READ_REQUEST_TYPE        0xc0
 132 #define VENDOR_READ_REQUEST             0x01
 133
 134 #define UART_STATE                      0x08
 135 #define UART_STATE_TRANSIENT_MASK       0x74
 136 #define UART_DCD                        0x01
 137 #define UART_DSR                        0x02
 138 #define UART_BREAK_ERROR                0x04
 139 #define UART_RING                       0x08
 140 #define UART_FRAME_ERROR                0x10
 141 #define UART_PARITY_ERROR               0x20
 142 #define UART_OVERRUN_ERROR              0x40
 143 #define UART_CTS                        0x80
 144
 145 /* function prototypes for a PL2303 serial converter */
 146 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 147 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 148 static void pl2303_set_termios (struct usb_serial_port *port,
 149                                 struct termios *old);
 150 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 151                          unsigned int cmd, unsigned long arg);
 152 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 153 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 154 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 155 static int pl2303_write (struct usb_serial_port *port,
 156                          const unsigned char *buf, int count);
 157 static void pl2303_send (struct usb_serial_port *port);
 158 static int pl2303_write_room(struct usb_serial_port *port);
 159 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 160 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 161 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 162 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 163                             unsigned int set, unsigned int clear);
 164 static int pl2303_startup (struct usb_serial *serial);
 165 static void pl2303_shutdown (struct usb_serial *serial);
 166 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 167 static void pl2303_buf_free(struct pl2303_buf *pb);
 168 static void pl2303_buf_clear(struct pl2303_buf *pb);
 169 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 170 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 171 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 172         unsigned int count);
 173 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 174         unsigned int count);
 175
 176
 177 /* All of the device info needed for the PL2303 SIO serial converter */
 178 static struct usb_serial_device_type pl2303_device = {
 179         .owner =                THIS_MODULE,
 180         .name =                 "PL-2303",
 181         .id_table =             id_table,
 182         .num_interrupt_in =     NUM_DONT_CARE,
 183         .num_bulk_in =          1,
 184         .num_bulk_out =         1,
 185         .num_ports =            1,
 186         .open =                 pl2303_open,
 187         .close =                pl2303_close,
 188         .write =                pl2303_write,
 189         .ioctl =                pl2303_ioctl,
 190         .break_ctl =            pl2303_break_ctl,
 191         .set_termios =          pl2303_set_termios,
 192         .tiocmget =             pl2303_tiocmget,
 193         .tiocmset =             pl2303_tiocmset,
 194         .read_bulk_callback =   pl2303_read_bulk_callback,
 195         .read_int_callback =    pl2303_read_int_callback,
 196         .write_bulk_callback =  pl2303_write_bulk_callback,
 197         .write_room =           pl2303_write_room,
 198         .chars_in_buffer =      pl2303_chars_in_buffer,
 199         .attach =               pl2303_startup,
 200         .shutdown =             pl2303_shutdown,
 201 };
 202
 203 enum pl2303_type {
 204         type_0,         /* don't know the difference between type 0 and */
 205         type_1,         /* type 1, until someone from prolific tells us... */
 206         HX,             /* HX version of the pl2303 chip */
 207 };
 208
 209 struct pl2303_private {
 210         spinlock_t lock;
 211         struct pl2303_buf *buf;
 212         int write_urb_in_use;
 213         wait_queue_head_t delta_msr_wait;
 214         u8 line_control;
 215         u8 line_status;
 216         u8 termios_initialized;
 217         enum pl2303_type type;
 218 };
 219
 220
 221 static int pl2303_startup (struct usb_serial *serial)
 222 {
 223         struct pl2303_private *priv;
 224         enum pl2303_type type = type_0;
 225         int i;
 226
 227         if (serial->dev->descriptor.bDeviceClass == 0x02)
 228                 type = type_0;
 229         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 230                 type = HX;
 231         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 232                 type = type_1;
 233         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 234                 type = type_1;
 235         dbg("device type: %d", type);
 236
 237         for (i = 0; i < serial->num_ports; ++i) {
 238                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 239                 if (!priv)
 240                         goto cleanup;
 241                 memset (priv, 0x00, sizeof (struct pl2303_private));
 242                 spin_lock_init(&priv->lock);
 243                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 244                 if (priv->buf == NULL) {
 245                         kfree(priv);
 246                         goto cleanup;
 247                 }
 248                 init_waitqueue_head(&priv->delta_msr_wait);
 249                 priv->type = type;
 250                 usb_set_serial_port_data(serial->port[i], priv);
 251         }
 252         return 0;
 253
 254 cleanup:
 255         for (--i; i>=0; --i) {
 256                 priv = usb_get_serial_port_data(serial->port[i]);
 257                 pl2303_buf_free(priv->buf);
 258                 kfree(priv);
 259                 usb_set_serial_port_data(serial->port[i], NULL);
 260         }
 261         return -ENOMEM;
 262 }
 263
 264 static int set_control_lines (struct usb_device *dev, u8 value)
 265 {
 266         int retval;
 267
 268         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 269                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 270                                   value, 0, NULL, 0, 100);
 271         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 272         return retval;
 273 }
 274
 275 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 276 {
 277         struct pl2303_private *priv = usb_get_serial_port_data(port);
 278         unsigned long flags;
 279
 280         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 281
 282         if (!count)
 283                 return count;
 284
 285         spin_lock_irqsave(&priv->lock, flags);
 286         count = pl2303_buf_put(priv->buf, buf, count);
 287         spin_unlock_irqrestore(&priv->lock, flags);
 288
 289         pl2303_send(port);
 290
 291         return count;
 292 }
 293
 294 static void pl2303_send(struct usb_serial_port *port)
 295 {
 296         int count, result;
 297         struct pl2303_private *priv = usb_get_serial_port_data(port);
 298         unsigned long flags;
 299
 300         dbg("%s - port %d", __FUNCTION__, port->number);
 301
 302         spin_lock_irqsave(&priv->lock, flags);
 303
 304         if (priv->write_urb_in_use) {
 305                 spin_unlock_irqrestore(&priv->lock, flags);
 306                 return;
 307         }
 308
 309         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 310                 port->bulk_out_size);
 311
 312         if (count == 0) {
 313                 spin_unlock_irqrestore(&priv->lock, flags);
 314                 return;
 315         }
 316
 317         priv->write_urb_in_use = 1;
 318
 319         spin_unlock_irqrestore(&priv->lock, flags);
 320
 321         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 322
 323         port->write_urb->transfer_buffer_length = count;
 324         port->write_urb->dev = port->serial->dev;
 325         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 326         if (result) {
 327                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 328                 priv->write_urb_in_use = 0;
 329                 // TODO: reschedule pl2303_send
 330         }
 331
 332         schedule_work(&port->work);
 333 }
 334
 335 static int pl2303_write_room(struct usb_serial_port *port)
 336 {
 337         struct pl2303_private *priv = usb_get_serial_port_data(port);
 338         int room = 0;
 339         unsigned long flags;
 340
 341         dbg("%s - port %d", __FUNCTION__, port->number);
 342
 343         spin_lock_irqsave(&priv->lock, flags);
 344         room = pl2303_buf_space_avail(priv->buf);
 345         spin_unlock_irqrestore(&priv->lock, flags);
 346
 347         dbg("%s - returns %d", __FUNCTION__, room);
 348         return room;
 349 }
 350
 351 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 352 {
 353         struct pl2303_private *priv = usb_get_serial_port_data(port);
 354         int chars = 0;
 355         unsigned long flags;
 356
 357         dbg("%s - port %d", __FUNCTION__, port->number);
 358
 359         spin_lock_irqsave(&priv->lock, flags);
 360         chars = pl2303_buf_data_avail(priv->buf);
 361         spin_unlock_irqrestore(&priv->lock, flags);
 362
 363         dbg("%s - returns %d", __FUNCTION__, chars);
 364         return chars;
 365 }
 366
 367 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 368 {
 369         struct usb_serial *serial = port->serial;
 370         struct pl2303_private *priv = usb_get_serial_port_data(port);
 371         unsigned long flags;
 372         unsigned int cflag;
 373         unsigned char *buf;
 374         int baud;
 375         int i;
 376         u8 control;
 377
 378         dbg("%s -  port %d", __FUNCTION__, port->number);
 379
 380         if ((!port->tty) || (!port->tty->termios)) {
 381                 dbg("%s - no tty structures", __FUNCTION__);
 382                 return;
 383         }
 384
 385         spin_lock_irqsave(&priv->lock, flags);
 386         if (!priv->termios_initialized) {
 387                 *(port->tty->termios) = tty_std_termios;
 388                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 389                 priv->termios_initialized = 1;
 390         }
 391         spin_unlock_irqrestore(&priv->lock, flags);
 392
 393         cflag = port->tty->termios->c_cflag;
 394         /* check that they really want us to change something */
 395         if (old_termios) {
 396                 if ((cflag == old_termios->c_cflag) &&
 397                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 398                     dbg("%s - nothing to change...", __FUNCTION__);
 399                     return;
 400                 }
 401         }
 402
 403         buf = kmalloc (7, GFP_KERNEL);
 404         if (!buf) {
 405                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 406                 return;
 407         }
 408         memset (buf, 0x00, 0x07);
 409
 410         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 411                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 412                              0, 0, buf, 7, 100);
 413         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 414              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 415
 416
 417         if (cflag & CSIZE) {
 418                 switch (cflag & CSIZE) {
 419                         case CS5:       buf[6] = 5;     break;
 420                         case CS6:       buf[6] = 6;     break;
 421                         case CS7:       buf[6] = 7;     break;
 422                         default:
 423                         case CS8:       buf[6] = 8;     break;
 424                 }
 425                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 426         }
 427
 428         baud = 0;
 429         switch (cflag & CBAUD) {
 430                 case B0:        baud = 0;       break;
 431                 case B75:       baud = 75;      break;
 432                 case B150:      baud = 150;     break;
 433                 case B300:      baud = 300;     break;
 434                 case B600:      baud = 600;     break;
 435                 case B1200:     baud = 1200;    break;
 436                 case B1800:     baud = 1800;    break;
 437                 case B2400:     baud = 2400;    break;
 438                 case B4800:     baud = 4800;    break;
 439                 case B9600:     baud = 9600;    break;
 440                 case B19200:    baud = 19200;   break;
 441                 case B38400:    baud = 38400;   break;
 442                 case B57600:    baud = 57600;   break;
 443                 case B115200:   baud = 115200;  break;
 444                 case B230400:   baud = 230400;  break;
 445                 case B460800:   baud = 460800;  break;
 446                 default:
 447                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 448                         break;
 449         }
 450         dbg("%s - baud = %d", __FUNCTION__, baud);
 451         if (baud) {
 452                 buf[0] = baud & 0xff;
 453                 buf[1] = (baud >> 8) & 0xff;
 454                 buf[2] = (baud >> 16) & 0xff;
 455                 buf[3] = (baud >> 24) & 0xff;
 456         }
 457
 458         /* For reference buf[4]=0 is 1 stop bits */
 459         /* For reference buf[4]=1 is 1.5 stop bits */
 460         /* For reference buf[4]=2 is 2 stop bits */
 461         if (cflag & CSTOPB) {
 462                 buf[4] = 2;
 463                 dbg("%s - stop bits = 2", __FUNCTION__);
 464         } else {
 465                 buf[4] = 0;
 466                 dbg("%s - stop bits = 1", __FUNCTION__);
 467         }
 468
 469         if (cflag & PARENB) {
 470                 /* For reference buf[5]=0 is none parity */
 471                 /* For reference buf[5]=1 is odd parity */
 472                 /* For reference buf[5]=2 is even parity */
 473                 /* For reference buf[5]=3 is mark parity */
 474                 /* For reference buf[5]=4 is space parity */
 475                 if (cflag & PARODD) {
 476                         buf[5] = 1;
 477                         dbg("%s - parity = odd", __FUNCTION__);
 478                 } else {
 479                         buf[5] = 2;
 480                         dbg("%s - parity = even", __FUNCTION__);
 481                 }
 482         } else {
 483                 buf[5] = 0;
 484                 dbg("%s - parity = none", __FUNCTION__);
 485         }
 486
 487         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 488                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 489                              0, 0, buf, 7, 100);
 490         dbg ("0x21:0x20:0:0  %d", i);
 491
 492         /* change control lines if we are switching to or from B0 */
 493         spin_lock_irqsave(&priv->lock, flags);
 494         control = priv->line_control;
 495         if ((cflag & CBAUD) == B0)
 496                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 497         else
 498                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 499         if (control != priv->line_control) {
 500                 control = priv->line_control;
 501                 spin_unlock_irqrestore(&priv->lock, flags);
 502                 set_control_lines(serial->dev, control);
 503         } else {
 504                 spin_unlock_irqrestore(&priv->lock, flags);
 505         }
 506
 507         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 508
 509         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 510                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 511                              0, 0, buf, 7, 100);
 512         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 513              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 514
 515         if (cflag & CRTSCTS) {
 516                 __u16 index;
 517                 if (priv->type == HX)
 518                         index = 0x61;
 519                 else
 520                         index = 0x41;
 521                 i = usb_control_msg(serial->dev,
 522                                     usb_sndctrlpipe(serial->dev, 0),
 523                                     VENDOR_WRITE_REQUEST,
 524                                     VENDOR_WRITE_REQUEST_TYPE,
 525                                     0x0, index, NULL, 0, 100);
 526                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 527         }
 528
 529         kfree (buf);
 530 }
 531
 532 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 533 {
 534         struct termios tmp_termios;
 535         struct usb_serial *serial = port->serial;
 536         struct pl2303_private *priv = usb_get_serial_port_data(port);
 537         unsigned char *buf;
 538         int result;
 539
 540         dbg("%s -  port %d", __FUNCTION__, port->number);
 541
 542         if (priv->type != HX) {
 543                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 544                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 545         }
 546
 547         buf = kmalloc(10, GFP_KERNEL);
 548         if (buf==NULL)
 549                 return -ENOMEM;
 550
 551 #define FISH(a,b,c,d)                                                           \
 552         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 553                                b, a, c, d, buf, 1, 100);                        \
 554         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 555
 556 #define SOUP(a,b,c,d)                                                           \
 557         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 558                                b, a, c, d, NULL, 0, 100);                       \
 559         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 560
 561         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 562         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 563         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 564         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 565         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 566         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 567         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 568         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 569         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 570         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 571
 572         if (priv->type == HX) {
 573                 /* HX chip */
 574                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 575                 /* reset upstream data pipes */
 576                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 577                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 578         } else {
 579                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 580         }
 581
 582         kfree(buf);
 583
 584         /* Setup termios */
 585         if (port->tty) {
 586                 pl2303_set_termios (port, &tmp_termios);
 587         }
 588
 589         //FIXME: need to assert RTS and DTR if CRTSCTS off
 590
 591         dbg("%s - submitting read urb", __FUNCTION__);
 592         port->read_urb->dev = serial->dev;
 593         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 594         if (result) {
 595                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 596                 pl2303_close (port, NULL);
 597                 return -EPROTO;
 598         }
 599
 600         dbg("%s - submitting interrupt urb", __FUNCTION__);
 601         port->interrupt_in_urb->dev = serial->dev;
 602         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 603         if (result) {
 604                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 605                 pl2303_close (port, NULL);
 606                 return -EPROTO;
 607         }
 608         return 0;
 609 }
 610
 611
 612 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 613 {
 614         struct pl2303_private *priv = usb_get_serial_port_data(port);
 615         unsigned long flags;
 616         unsigned int c_cflag;
 617         int bps;
 618         long timeout;
 619         wait_queue_t wait;                                              \
 620
 621         dbg("%s - port %d", __FUNCTION__, port->number);
 622
 623         /* wait for data to drain from the buffer */
 624         spin_lock_irqsave(&priv->lock, flags);
 625         timeout = PL2303_CLOSING_WAIT;
 626         init_waitqueue_entry(&wait, current);
 627         add_wait_queue(&port->tty->write_wait, &wait);
 628         for (;;) {
 629                 set_current_state(TASK_INTERRUPTIBLE);
 630                 if (pl2303_buf_data_avail(priv->buf) == 0
 631                 || timeout == 0 || signal_pending(current)
 632                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 633                         break;
 634                 spin_unlock_irqrestore(&priv->lock, flags);
 635                 timeout = schedule_timeout(timeout);
 636                 spin_lock_irqsave(&priv->lock, flags);
 637         }
 638         set_current_state(TASK_RUNNING);
 639         remove_wait_queue(&port->tty->write_wait, &wait);
 640         /* clear out any remaining data in the buffer */
 641         pl2303_buf_clear(priv->buf);
 642         spin_unlock_irqrestore(&priv->lock, flags);
 643
 644         /* wait for characters to drain from the device */
 645         /* (this is long enough for the entire 256 byte */
 646         /* pl2303 hardware buffer to drain with no flow */
 647         /* control for data rates of 1200 bps or more, */
 648         /* for lower rates we should really know how much */
 649         /* data is in the buffer to compute a delay */
 650         /* that is not unnecessarily long) */
 651         bps = tty_get_baud_rate(port->tty);
 652         if (bps > 1200)
 653                 timeout = max((HZ*2560)/bps,HZ/10);
 654         else
 655                 timeout = 2*HZ;
 656         schedule_timeout_interruptible(timeout);
 657
 658         /* shutdown our urbs */
 659         dbg("%s - shutting down urbs", __FUNCTION__);
 660         usb_kill_urb(port->write_urb);
 661         usb_kill_urb(port->read_urb);
 662         usb_kill_urb(port->interrupt_in_urb);
 663
 664         if (port->tty) {
 665                 c_cflag = port->tty->termios->c_cflag;
 666                 if (c_cflag & HUPCL) {
 667                         /* drop DTR and RTS */
 668                         spin_lock_irqsave(&priv->lock, flags);
 669                         priv->line_control = 0;
 670                         spin_unlock_irqrestore (&priv->lock, flags);
 671                         set_control_lines (port->serial->dev, 0);
 672                 }
 673         }
 674 }
 675
 676 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 677                             unsigned int set, unsigned int clear)
 678 {
 679         struct pl2303_private *priv = usb_get_serial_port_data(port);
 680         unsigned long flags;
 681         u8 control;
 682
 683         if (!usb_get_intfdata(port->serial->interface))
 684                 return -ENODEV;
 685
 686         spin_lock_irqsave (&priv->lock, flags);
 687         if (set & TIOCM_RTS)
 688                 priv->line_control |= CONTROL_RTS;
 689         if (set & TIOCM_DTR)
 690                 priv->line_control |= CONTROL_DTR;
 691         if (clear & TIOCM_RTS)
 692                 priv->line_control &= ~CONTROL_RTS;
 693         if (clear & TIOCM_DTR)
 694                 priv->line_control &= ~CONTROL_DTR;
 695         control = priv->line_control;
 696         spin_unlock_irqrestore (&priv->lock, flags);
 697
 698         return set_control_lines (port->serial->dev, control);
 699 }
 700
 701 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 702 {
 703         struct pl2303_private *priv = usb_get_serial_port_data(port);
 704         unsigned long flags;
 705         unsigned int mcr;
 706         unsigned int status;
 707         unsigned int result;
 708
 709         dbg("%s (%d)", __FUNCTION__, port->number);
 710
 711         if (!usb_get_intfdata(port->serial->interface))
 712                 return -ENODEV;
 713
 714         spin_lock_irqsave (&priv->lock, flags);
 715         mcr = priv->line_control;
 716         status = priv->line_status;
 717         spin_unlock_irqrestore (&priv->lock, flags);
 718
 719         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 720                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 721                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 722                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 723                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 724                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 725
 726         dbg("%s - result = %x", __FUNCTION__, result);
 727
 728         return result;
 729 }
 730
 731 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 732 {
 733         struct pl2303_private *priv = usb_get_serial_port_data(port);
 734         unsigned long flags;
 735         unsigned int prevstatus;
 736         unsigned int status;
 737         unsigned int changed;
 738
 739         spin_lock_irqsave (&priv->lock, flags);
 740         prevstatus = priv->line_status;
 741         spin_unlock_irqrestore (&priv->lock, flags);
 742
 743         while (1) {
 744                 interruptible_sleep_on(&priv->delta_msr_wait);
 745                 /* see if a signal did it */
 746                 if (signal_pending(current))
 747                         return -ERESTARTSYS;
 748
 749                 spin_lock_irqsave (&priv->lock, flags);
 750                 status = priv->line_status;
 751                 spin_unlock_irqrestore (&priv->lock, flags);
 752
 753                 changed=prevstatus^status;
 754
 755                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 756                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 757                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 758                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 759                         return 0;
 760                 }
 761                 prevstatus = status;
 762         }
 763         /* NOTREACHED */
 764         return 0;
 765 }
 766
 767 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 768 {
 769         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 770
 771         switch (cmd) {
 772                 case TIOCMIWAIT:
 773                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 774                         return wait_modem_info(port, arg);
 775
 776                 default:
 777                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 778                         break;
 779         }
 780
 781         return -ENOIOCTLCMD;
 782 }
 783
 784 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 785 {
 786         struct usb_serial *serial = port->serial;
 787         u16 state;
 788         int result;
 789
 790         dbg("%s - port %d", __FUNCTION__, port->number);
 791
 792         if (break_state == 0)
 793                 state = BREAK_OFF;
 794         else
 795                 state = BREAK_ON;
 796         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 797
 798         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 799                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 800                                   0, NULL, 0, 100);
 801         if (result)
 802                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 803 }
 804
 805
 806 static void pl2303_shutdown (struct usb_serial *serial)
 807 {
 808         int i;
 809         struct pl2303_private *priv;
 810
 811         dbg("%s", __FUNCTION__);
 812
 813         for (i = 0; i < serial->num_ports; ++i) {
 814                 priv = usb_get_serial_port_data(serial->port[i]);
 815                 if (priv) {
 816                         pl2303_buf_free(priv->buf);
 817                         kfree(priv);
 818                         usb_set_serial_port_data(serial->port[i], NULL);
 819                 }
 820         }
 821 }
 822
 823 static void pl2303_update_line_status(struct usb_serial_port *port,
 824                                       unsigned char *data,
 825                                       unsigned int actual_length)
 826 {
 827
 828         struct pl2303_private *priv = usb_get_serial_port_data(port);
 829         unsigned long flags;
 830         u8 status_idx = UART_STATE;
 831         u8 length = UART_STATE;
 832
 833         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 834             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65)) {
 835                 length = 1;
 836                 status_idx = 0;
 837         }
 838
 839         if (actual_length < length)
 840                 goto exit;
 841
 842         /* Save off the uart status for others to look at */
 843         spin_lock_irqsave(&priv->lock, flags);
 844         priv->line_status = data[status_idx];
 845         spin_unlock_irqrestore(&priv->lock, flags);
 846
 847 exit:
 848         return;
 849 }
 850
 851 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 852 {
 853         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 854         unsigned char *data = urb->transfer_buffer;
 855         unsigned int actual_length = urb->actual_length;
 856         int status;
 857
 858         dbg("%s (%d)", __FUNCTION__, port->number);
 859
 860         switch (urb->status) {
 861         case 0:
 862                 /* success */
 863                 break;
 864         case -ECONNRESET:
 865         case -ENOENT:
 866         case -ESHUTDOWN:
 867                 /* this urb is terminated, clean up */
 868                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 869                 return;
 870         default:
 871                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 872                 goto exit;
 873         }
 874
 875         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 876         pl2303_update_line_status(port, data, actual_length);
 877
 878 exit:
 879         status = usb_submit_urb (urb, GFP_ATOMIC);
 880         if (status)
 881                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 882                         __FUNCTION__, status);
 883 }
 884
 885
 886 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 887 {
 888         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 889         struct pl2303_private *priv = usb_get_serial_port_data(port);
 890         struct tty_struct *tty;
 891         unsigned char *data = urb->transfer_buffer;
 892         unsigned long flags;
 893         int i;
 894         int result;
 895         u8 status;
 896         char tty_flag;
 897
 898         dbg("%s - port %d", __FUNCTION__, port->number);
 899
 900         if (urb->status) {
 901                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 902                 if (!port->open_count) {
 903                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 904                         return;
 905                 }
 906                 if (urb->status == -EPROTO) {
 907                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 908                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 909                         urb->status = 0;
 910                         urb->dev = port->serial->dev;
 911                         result = usb_submit_urb(urb, GFP_ATOMIC);
 912                         if (result)
 913                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 914                         return;
 915                 }
 916                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 917                 return;
 918         }
 919
 920         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 921
 922         /* get tty_flag from status */
 923         tty_flag = TTY_NORMAL;
 924
 925         spin_lock_irqsave(&priv->lock, flags);
 926         status = priv->line_status;
 927         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 928         spin_unlock_irqrestore(&priv->lock, flags);
 929         wake_up_interruptible (&priv->delta_msr_wait);
 930
 931         /* break takes precedence over parity, */
 932         /* which takes precedence over framing errors */
 933         if (status & UART_BREAK_ERROR )
 934                 tty_flag = TTY_BREAK;
 935         else if (status & UART_PARITY_ERROR)
 936                 tty_flag = TTY_PARITY;
 937         else if (status & UART_FRAME_ERROR)
 938                 tty_flag = TTY_FRAME;
 939         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 940
 941         tty = port->tty;
 942         if (tty && urb->actual_length) {
 943                 /* overrun is special, not associated with a char */
 944                 if (status & UART_OVERRUN_ERROR)
 945                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 946
 947                 for (i = 0; i < urb->actual_length; ++i) {
 948                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 949                                 tty_flip_buffer_push(tty);
 950                         }
 951                         tty_insert_flip_char (tty, data[i], tty_flag);
 952                 }
 953                 tty_flip_buffer_push (tty);
 954         }
 955
 956         /* Schedule the next read _if_ we are still open */
 957         if (port->open_count) {
 958                 urb->dev = port->serial->dev;
 959                 result = usb_submit_urb(urb, GFP_ATOMIC);
 960                 if (result)
 961                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 962         }
 963
 964         return;
 965 }
 966
 967
 968
 969 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 970 {
 971         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 972         struct pl2303_private *priv = usb_get_serial_port_data(port);
 973         int result;
 974
 975         dbg("%s - port %d", __FUNCTION__, port->number);
 976
 977         switch (urb->status) {
 978         case 0:
 979                 /* success */
 980                 break;
 981         case -ECONNRESET:
 982         case -ENOENT:
 983         case -ESHUTDOWN:
 984                 /* this urb is terminated, clean up */
 985                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 986                 priv->write_urb_in_use = 0;
 987                 return;
 988         default:
 989                 /* error in the urb, so we have to resubmit it */
 990                 dbg("%s - Overflow in write", __FUNCTION__);
 991                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 992                 port->write_urb->transfer_buffer_length = 1;
 993                 port->write_urb->dev = port->serial->dev;
 994                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 995                 if (result)
 996                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 997                 else
 998                         return;
 999         }
1000
1001         priv->write_urb_in_use = 0;
1002
1003         /* send any buffered data */
1004         pl2303_send(port);
1005 }
1006
1007
1008 /*
1009  * pl2303_buf_alloc
1010  *
1011  * Allocate a circular buffer and all associated memory.
1012  */
1013
1014 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
1015 {
1016
1017         struct pl2303_buf *pb;
1018
1019
1020         if (size == 0)
1021                 return NULL;
1022
1023         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1024         if (pb == NULL)
1025                 return NULL;
1026
1027         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1028         if (pb->buf_buf == NULL) {
1029                 kfree(pb);
1030                 return NULL;
1031         }
1032
1033         pb->buf_size = size;
1034         pb->buf_get = pb->buf_put = pb->buf_buf;
1035
1036         return pb;
1037
1038 }
1039
1040
1041 /*
1042  * pl2303_buf_free
1043  *
1044  * Free the buffer and all associated memory.
1045  */
1046
1047 static void pl2303_buf_free(struct pl2303_buf *pb)
1048 {
1049         if (pb) {
1050                 kfree(pb->buf_buf);
1051                 kfree(pb);
1052         }
1053 }
1054
1055
1056 /*
1057  * pl2303_buf_clear
1058  *
1059  * Clear out all data in the circular buffer.
1060  */
1061
1062 static void pl2303_buf_clear(struct pl2303_buf *pb)
1063 {
1064         if (pb != NULL)
1065                 pb->buf_get = pb->buf_put;
1066                 /* equivalent to a get of all data available */
1067 }
1068
1069
1070 /*
1071  * pl2303_buf_data_avail
1072  *
1073  * Return the number of bytes of data available in the circular
1074  * buffer.
1075  */
1076
1077 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1078 {
1079         if (pb != NULL)
1080                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1081         else
1082                 return 0;
1083 }
1084
1085
1086 /*
1087  * pl2303_buf_space_avail
1088  *
1089  * Return the number of bytes of space available in the circular
1090  * buffer.
1091  */
1092
1093 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1094 {
1095         if (pb != NULL)
1096                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1097         else
1098                 return 0;
1099 }
1100
1101
1102 /*
1103  * pl2303_buf_put
1104  *
1105  * Copy data data from a user buffer and put it into the circular buffer.
1106  * Restrict to the amount of space available.
1107  *
1108  * Return the number of bytes copied.
1109  */
1110
1111 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1112         unsigned int count)
1113 {
1114
1115         unsigned int len;
1116
1117
1118         if (pb == NULL)
1119                 return 0;
1120
1121         len  = pl2303_buf_space_avail(pb);
1122         if (count > len)
1123                 count = len;
1124
1125         if (count == 0)
1126                 return 0;
1127
1128         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1129         if (count > len) {
1130                 memcpy(pb->buf_put, buf, len);
1131                 memcpy(pb->buf_buf, buf+len, count - len);
1132                 pb->buf_put = pb->buf_buf + count - len;
1133         } else {
1134                 memcpy(pb->buf_put, buf, count);
1135                 if (count < len)
1136                         pb->buf_put += count;
1137                 else /* count == len */
1138                         pb->buf_put = pb->buf_buf;
1139         }
1140
1141         return count;
1142
1143 }
1144
1145
1146 /*
1147  * pl2303_buf_get
1148  *
1149  * Get data from the circular buffer and copy to the given buffer.
1150  * Restrict to the amount of data available.
1151  *
1152  * Return the number of bytes copied.
1153  */
1154
1155 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1156         unsigned int count)
1157 {
1158
1159         unsigned int len;
1160
1161
1162         if (pb == NULL)
1163                 return 0;
1164
1165         len = pl2303_buf_data_avail(pb);
1166         if (count > len)
1167                 count = len;
1168
1169         if (count == 0)
1170                 return 0;
1171
1172         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1173         if (count > len) {
1174                 memcpy(buf, pb->buf_get, len);
1175                 memcpy(buf+len, pb->buf_buf, count - len);
1176                 pb->buf_get = pb->buf_buf + count - len;
1177         } else {
1178                 memcpy(buf, pb->buf_get, count);
1179                 if (count < len)
1180                         pb->buf_get += count;
1181                 else /* count == len */
1182                         pb->buf_get = pb->buf_buf;
1183         }
1184
1185         return count;
1186
1187 }
1188
1189 static int __init pl2303_init (void)
1190 {
1191         int retval;
1192         retval = usb_serial_register(&pl2303_device);
1193         if (retval)
1194                 goto failed_usb_serial_register;
1195         retval = usb_register(&pl2303_driver);
1196         if (retval)
1197                 goto failed_usb_register;
1198         info(DRIVER_DESC " " DRIVER_VERSION);
1199         return 0;
1200 failed_usb_register:
1201         usb_serial_deregister(&pl2303_device);
1202 failed_usb_serial_register:
1203         return retval;
1204 }
1205
1206
1207 static void __exit pl2303_exit (void)
1208 {
1209         usb_deregister (&pl2303_driver);
1210         usb_serial_deregister (&pl2303_device);
1211 }
1212
1213
1214 module_init(pl2303_init);
1215 module_exit(pl2303_exit);
1216
1217 MODULE_DESCRIPTION(DRIVER_DESC);
1218 MODULE_VERSION(DRIVER_VERSION);
1219 MODULE_LICENSE("GPL");
1220
1221 module_param(debug, bool, S_IRUGO | S_IWUSR);
1222 MODULE_PARM_DESC(debug, "Debug enabled or not");
1223