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