git.oblomov.eu Git - linux-2.6/blob - 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.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this driver
  14  *
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_driver.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/serial.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/spinlock.h>
  29 #include <asm/uaccess.h>
  30 #include <linux/usb.h>
  31 #include "usb-serial.h"
  32 #include "pl2303.h"
  33
  34 /*
  35  * Version Information
  36  */
  37 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  38
  39 static int debug;
  40
  41 #define PL2303_CLOSING_WAIT     (30*HZ)
  42
  43 #define PL2303_BUF_SIZE         1024
  44 #define PL2303_TMP_BUF_SIZE     1024
  45
  46 struct pl2303_buf {
  47         unsigned int    buf_size;
  48         char            *buf_buf;
  49         char            *buf_get;
  50         char            *buf_put;
  51 };
  52
  53 static struct usb_device_id id_table [] = {
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  56         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  57         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  58         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  59         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  60         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  61         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  62         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  63         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  64         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  65         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  66         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  67         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  68         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  69         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  70         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  71         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  72         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  75         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  76         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  77         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  78         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  79         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  80         { }                                     /* Terminating entry */
  81 };
  82
  83 MODULE_DEVICE_TABLE (usb, id_table);
  84
  85 static struct usb_driver pl2303_driver = {
  86         .name =         "pl2303",
  87         .probe =        usb_serial_probe,
  88         .disconnect =   usb_serial_disconnect,
  89         .id_table =     id_table,
  90         .no_dynamic_id =        1,
  91 };
  92
  93 #define SET_LINE_REQUEST_TYPE           0x21
  94 #define SET_LINE_REQUEST                0x20
  95
  96 #define SET_CONTROL_REQUEST_TYPE        0x21
  97 #define SET_CONTROL_REQUEST             0x22
  98 #define CONTROL_DTR                     0x01
  99 #define CONTROL_RTS                     0x02
 100
 101 #define BREAK_REQUEST_TYPE              0x21
 102 #define BREAK_REQUEST                   0x23
 103 #define BREAK_ON                        0xffff
 104 #define BREAK_OFF                       0x0000
 105
 106 #define GET_LINE_REQUEST_TYPE           0xa1
 107 #define GET_LINE_REQUEST                0x21
 108
 109 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 110 #define VENDOR_WRITE_REQUEST            0x01
 111
 112 #define VENDOR_READ_REQUEST_TYPE        0xc0
 113 #define VENDOR_READ_REQUEST             0x01
 114
 115 #define UART_STATE                      0x08
 116 #define UART_STATE_TRANSIENT_MASK       0x74
 117 #define UART_DCD                        0x01
 118 #define UART_DSR                        0x02
 119 #define UART_BREAK_ERROR                0x04
 120 #define UART_RING                       0x08
 121 #define UART_FRAME_ERROR                0x10
 122 #define UART_PARITY_ERROR               0x20
 123 #define UART_OVERRUN_ERROR              0x40
 124 #define UART_CTS                        0x80
 125
 126 /* function prototypes for a PL2303 serial converter */
 127 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 128 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 129 static void pl2303_set_termios (struct usb_serial_port *port,
 130                                 struct termios *old);
 131 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 132                          unsigned int cmd, unsigned long arg);
 133 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 134 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 135 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 136 static int pl2303_write (struct usb_serial_port *port,
 137                          const unsigned char *buf, int count);
 138 static void pl2303_send (struct usb_serial_port *port);
 139 static int pl2303_write_room(struct usb_serial_port *port);
 140 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 141 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 142 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 143 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 144                             unsigned int set, unsigned int clear);
 145 static int pl2303_startup (struct usb_serial *serial);
 146 static void pl2303_shutdown (struct usb_serial *serial);
 147 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 148 static void pl2303_buf_free(struct pl2303_buf *pb);
 149 static void pl2303_buf_clear(struct pl2303_buf *pb);
 150 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 151 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 152 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 153         unsigned int count);
 154 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 155         unsigned int count);
 156
 157
 158 /* All of the device info needed for the PL2303 SIO serial converter */
 159 static struct usb_serial_driver pl2303_device = {
 160         .driver = {
 161                 .owner =        THIS_MODULE,
 162                 .name =         "pl2303",
 163         },
 164         .id_table =             id_table,
 165         .num_interrupt_in =     NUM_DONT_CARE,
 166         .num_bulk_in =          1,
 167         .num_bulk_out =         1,
 168         .num_ports =            1,
 169         .open =                 pl2303_open,
 170         .close =                pl2303_close,
 171         .write =                pl2303_write,
 172         .ioctl =                pl2303_ioctl,
 173         .break_ctl =            pl2303_break_ctl,
 174         .set_termios =          pl2303_set_termios,
 175         .tiocmget =             pl2303_tiocmget,
 176         .tiocmset =             pl2303_tiocmset,
 177         .read_bulk_callback =   pl2303_read_bulk_callback,
 178         .read_int_callback =    pl2303_read_int_callback,
 179         .write_bulk_callback =  pl2303_write_bulk_callback,
 180         .write_room =           pl2303_write_room,
 181         .chars_in_buffer =      pl2303_chars_in_buffer,
 182         .attach =               pl2303_startup,
 183         .shutdown =             pl2303_shutdown,
 184 };
 185
 186 enum pl2303_type {
 187         type_0,         /* don't know the difference between type 0 and */
 188         type_1,         /* type 1, until someone from prolific tells us... */
 189         HX,             /* HX version of the pl2303 chip */
 190 };
 191
 192 struct pl2303_private {
 193         spinlock_t lock;
 194         struct pl2303_buf *buf;
 195         int write_urb_in_use;
 196         wait_queue_head_t delta_msr_wait;
 197         u8 line_control;
 198         u8 line_status;
 199         u8 termios_initialized;
 200         enum pl2303_type type;
 201 };
 202
 203
 204 static int pl2303_startup (struct usb_serial *serial)
 205 {
 206         struct pl2303_private *priv;
 207         enum pl2303_type type = type_0;
 208         int i;
 209
 210         if (serial->dev->descriptor.bDeviceClass == 0x02)
 211                 type = type_0;
 212         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 213                 type = HX;
 214         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 215                 type = type_1;
 216         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 217                 type = type_1;
 218         dbg("device type: %d", type);
 219
 220         for (i = 0; i < serial->num_ports; ++i) {
 221                 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
 222                 if (!priv)
 223                         goto cleanup;
 224                 spin_lock_init(&priv->lock);
 225                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 226                 if (priv->buf == NULL) {
 227                         kfree(priv);
 228                         goto cleanup;
 229                 }
 230                 init_waitqueue_head(&priv->delta_msr_wait);
 231                 priv->type = type;
 232                 usb_set_serial_port_data(serial->port[i], priv);
 233         }
 234         return 0;
 235
 236 cleanup:
 237         for (--i; i>=0; --i) {
 238                 priv = usb_get_serial_port_data(serial->port[i]);
 239                 pl2303_buf_free(priv->buf);
 240                 kfree(priv);
 241                 usb_set_serial_port_data(serial->port[i], NULL);
 242         }
 243         return -ENOMEM;
 244 }
 245
 246 static int set_control_lines (struct usb_device *dev, u8 value)
 247 {
 248         int retval;
 249
 250         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 251                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 252                                   value, 0, NULL, 0, 100);
 253         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 254         return retval;
 255 }
 256
 257 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 258 {
 259         struct pl2303_private *priv = usb_get_serial_port_data(port);
 260         unsigned long flags;
 261
 262         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 263
 264         if (!count)
 265                 return count;
 266
 267         spin_lock_irqsave(&priv->lock, flags);
 268         count = pl2303_buf_put(priv->buf, buf, count);
 269         spin_unlock_irqrestore(&priv->lock, flags);
 270
 271         pl2303_send(port);
 272
 273         return count;
 274 }
 275
 276 static void pl2303_send(struct usb_serial_port *port)
 277 {
 278         int count, result;
 279         struct pl2303_private *priv = usb_get_serial_port_data(port);
 280         unsigned long flags;
 281
 282         dbg("%s - port %d", __FUNCTION__, port->number);
 283
 284         spin_lock_irqsave(&priv->lock, flags);
 285
 286         if (priv->write_urb_in_use) {
 287                 spin_unlock_irqrestore(&priv->lock, flags);
 288                 return;
 289         }
 290
 291         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 292                 port->bulk_out_size);
 293
 294         if (count == 0) {
 295                 spin_unlock_irqrestore(&priv->lock, flags);
 296                 return;
 297         }
 298
 299         priv->write_urb_in_use = 1;
 300
 301         spin_unlock_irqrestore(&priv->lock, flags);
 302
 303         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 304
 305         port->write_urb->transfer_buffer_length = count;
 306         port->write_urb->dev = port->serial->dev;
 307         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 308         if (result) {
 309                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 310                 priv->write_urb_in_use = 0;
 311                 // TODO: reschedule pl2303_send
 312         }
 313
 314         schedule_work(&port->work);
 315 }
 316
 317 static int pl2303_write_room(struct usb_serial_port *port)
 318 {
 319         struct pl2303_private *priv = usb_get_serial_port_data(port);
 320         int room = 0;
 321         unsigned long flags;
 322
 323         dbg("%s - port %d", __FUNCTION__, port->number);
 324
 325         spin_lock_irqsave(&priv->lock, flags);
 326         room = pl2303_buf_space_avail(priv->buf);
 327         spin_unlock_irqrestore(&priv->lock, flags);
 328
 329         dbg("%s - returns %d", __FUNCTION__, room);
 330         return room;
 331 }
 332
 333 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 334 {
 335         struct pl2303_private *priv = usb_get_serial_port_data(port);
 336         int chars = 0;
 337         unsigned long flags;
 338
 339         dbg("%s - port %d", __FUNCTION__, port->number);
 340
 341         spin_lock_irqsave(&priv->lock, flags);
 342         chars = pl2303_buf_data_avail(priv->buf);
 343         spin_unlock_irqrestore(&priv->lock, flags);
 344
 345         dbg("%s - returns %d", __FUNCTION__, chars);
 346         return chars;
 347 }
 348
 349 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 350 {
 351         struct usb_serial *serial = port->serial;
 352         struct pl2303_private *priv = usb_get_serial_port_data(port);
 353         unsigned long flags;
 354         unsigned int cflag;
 355         unsigned char *buf;
 356         int baud;
 357         int i;
 358         u8 control;
 359
 360         dbg("%s -  port %d", __FUNCTION__, port->number);
 361
 362         if ((!port->tty) || (!port->tty->termios)) {
 363                 dbg("%s - no tty structures", __FUNCTION__);
 364                 return;
 365         }
 366
 367         spin_lock_irqsave(&priv->lock, flags);
 368         if (!priv->termios_initialized) {
 369                 *(port->tty->termios) = tty_std_termios;
 370                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 371                 priv->termios_initialized = 1;
 372         }
 373         spin_unlock_irqrestore(&priv->lock, flags);
 374
 375         cflag = port->tty->termios->c_cflag;
 376         /* check that they really want us to change something */
 377         if (old_termios) {
 378                 if ((cflag == old_termios->c_cflag) &&
 379                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 380                     dbg("%s - nothing to change...", __FUNCTION__);
 381                     return;
 382                 }
 383         }
 384
 385         buf = kzalloc (7, GFP_KERNEL);
 386         if (!buf) {
 387                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 388                 return;
 389         }
 390
 391         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 392                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 393                              0, 0, buf, 7, 100);
 394         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 395              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 396
 397
 398         if (cflag & CSIZE) {
 399                 switch (cflag & CSIZE) {
 400                         case CS5:       buf[6] = 5;     break;
 401                         case CS6:       buf[6] = 6;     break;
 402                         case CS7:       buf[6] = 7;     break;
 403                         default:
 404                         case CS8:       buf[6] = 8;     break;
 405                 }
 406                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 407         }
 408
 409         baud = 0;
 410         switch (cflag & CBAUD) {
 411                 case B0:        baud = 0;       break;
 412                 case B75:       baud = 75;      break;
 413                 case B150:      baud = 150;     break;
 414                 case B300:      baud = 300;     break;
 415                 case B600:      baud = 600;     break;
 416                 case B1200:     baud = 1200;    break;
 417                 case B1800:     baud = 1800;    break;
 418                 case B2400:     baud = 2400;    break;
 419                 case B4800:     baud = 4800;    break;
 420                 case B9600:     baud = 9600;    break;
 421                 case B19200:    baud = 19200;   break;
 422                 case B38400:    baud = 38400;   break;
 423                 case B57600:    baud = 57600;   break;
 424                 case B115200:   baud = 115200;  break;
 425                 case B230400:   baud = 230400;  break;
 426                 case B460800:   baud = 460800;  break;
 427                 default:
 428                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 429                         break;
 430         }
 431         dbg("%s - baud = %d", __FUNCTION__, baud);
 432         if (baud) {
 433                 buf[0] = baud & 0xff;
 434                 buf[1] = (baud >> 8) & 0xff;
 435                 buf[2] = (baud >> 16) & 0xff;
 436                 buf[3] = (baud >> 24) & 0xff;
 437         }
 438
 439         /* For reference buf[4]=0 is 1 stop bits */
 440         /* For reference buf[4]=1 is 1.5 stop bits */
 441         /* For reference buf[4]=2 is 2 stop bits */
 442         if (cflag & CSTOPB) {
 443                 buf[4] = 2;
 444                 dbg("%s - stop bits = 2", __FUNCTION__);
 445         } else {
 446                 buf[4] = 0;
 447                 dbg("%s - stop bits = 1", __FUNCTION__);
 448         }
 449
 450         if (cflag & PARENB) {
 451                 /* For reference buf[5]=0 is none parity */
 452                 /* For reference buf[5]=1 is odd parity */
 453                 /* For reference buf[5]=2 is even parity */
 454                 /* For reference buf[5]=3 is mark parity */
 455                 /* For reference buf[5]=4 is space parity */
 456                 if (cflag & PARODD) {
 457                         buf[5] = 1;
 458                         dbg("%s - parity = odd", __FUNCTION__);
 459                 } else {
 460                         buf[5] = 2;
 461                         dbg("%s - parity = even", __FUNCTION__);
 462                 }
 463         } else {
 464                 buf[5] = 0;
 465                 dbg("%s - parity = none", __FUNCTION__);
 466         }
 467
 468         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 469                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 470                              0, 0, buf, 7, 100);
 471         dbg ("0x21:0x20:0:0  %d", i);
 472
 473         /* change control lines if we are switching to or from B0 */
 474         spin_lock_irqsave(&priv->lock, flags);
 475         control = priv->line_control;
 476         if ((cflag & CBAUD) == B0)
 477                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 478         else
 479                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 480         if (control != priv->line_control) {
 481                 control = priv->line_control;
 482                 spin_unlock_irqrestore(&priv->lock, flags);
 483                 set_control_lines(serial->dev, control);
 484         } else {
 485                 spin_unlock_irqrestore(&priv->lock, flags);
 486         }
 487
 488         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 489
 490         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 491                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 492                              0, 0, buf, 7, 100);
 493         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 494              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 495
 496         if (cflag & CRTSCTS) {
 497                 __u16 index;
 498                 if (priv->type == HX)
 499                         index = 0x61;
 500                 else
 501                         index = 0x41;
 502                 i = usb_control_msg(serial->dev,
 503                                     usb_sndctrlpipe(serial->dev, 0),
 504                                     VENDOR_WRITE_REQUEST,
 505                                     VENDOR_WRITE_REQUEST_TYPE,
 506                                     0x0, index, NULL, 0, 100);
 507                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 508         }
 509
 510         kfree (buf);
 511 }
 512
 513 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 514 {
 515         struct termios tmp_termios;
 516         struct usb_serial *serial = port->serial;
 517         struct pl2303_private *priv = usb_get_serial_port_data(port);
 518         unsigned char *buf;
 519         int result;
 520
 521         dbg("%s -  port %d", __FUNCTION__, port->number);
 522
 523         if (priv->type != HX) {
 524                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 525                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 526         }
 527
 528         buf = kmalloc(10, GFP_KERNEL);
 529         if (buf==NULL)
 530                 return -ENOMEM;
 531
 532 #define FISH(a,b,c,d)                                                           \
 533         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 534                                b, a, c, d, buf, 1, 100);                        \
 535         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 536
 537 #define SOUP(a,b,c,d)                                                           \
 538         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 539                                b, a, c, d, NULL, 0, 100);                       \
 540         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 541
 542         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 543         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 544         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 545         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 546         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 547         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 548         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 549         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 550         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 551         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 552
 553         if (priv->type == HX) {
 554                 /* HX chip */
 555                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 556                 /* reset upstream data pipes */
 557                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 558                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 559         } else {
 560                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 561         }
 562
 563         kfree(buf);
 564
 565         /* Setup termios */
 566         if (port->tty) {
 567                 pl2303_set_termios (port, &tmp_termios);
 568         }
 569
 570         //FIXME: need to assert RTS and DTR if CRTSCTS off
 571
 572         dbg("%s - submitting read urb", __FUNCTION__);
 573         port->read_urb->dev = serial->dev;
 574         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 575         if (result) {
 576                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 577                 pl2303_close (port, NULL);
 578                 return -EPROTO;
 579         }
 580
 581         dbg("%s - submitting interrupt urb", __FUNCTION__);
 582         port->interrupt_in_urb->dev = serial->dev;
 583         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 584         if (result) {
 585                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 586                 pl2303_close (port, NULL);
 587                 return -EPROTO;
 588         }
 589         return 0;
 590 }
 591
 592
 593 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 594 {
 595         struct pl2303_private *priv = usb_get_serial_port_data(port);
 596         unsigned long flags;
 597         unsigned int c_cflag;
 598         int bps;
 599         long timeout;
 600         wait_queue_t wait;                                              \
 601
 602         dbg("%s - port %d", __FUNCTION__, port->number);
 603
 604         /* wait for data to drain from the buffer */
 605         spin_lock_irqsave(&priv->lock, flags);
 606         timeout = PL2303_CLOSING_WAIT;
 607         init_waitqueue_entry(&wait, current);
 608         add_wait_queue(&port->tty->write_wait, &wait);
 609         for (;;) {
 610                 set_current_state(TASK_INTERRUPTIBLE);
 611                 if (pl2303_buf_data_avail(priv->buf) == 0
 612                 || timeout == 0 || signal_pending(current)
 613                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 614                         break;
 615                 spin_unlock_irqrestore(&priv->lock, flags);
 616                 timeout = schedule_timeout(timeout);
 617                 spin_lock_irqsave(&priv->lock, flags);
 618         }
 619         set_current_state(TASK_RUNNING);
 620         remove_wait_queue(&port->tty->write_wait, &wait);
 621         /* clear out any remaining data in the buffer */
 622         pl2303_buf_clear(priv->buf);
 623         spin_unlock_irqrestore(&priv->lock, flags);
 624
 625         /* wait for characters to drain from the device */
 626         /* (this is long enough for the entire 256 byte */
 627         /* pl2303 hardware buffer to drain with no flow */
 628         /* control for data rates of 1200 bps or more, */
 629         /* for lower rates we should really know how much */
 630         /* data is in the buffer to compute a delay */
 631         /* that is not unnecessarily long) */
 632         bps = tty_get_baud_rate(port->tty);
 633         if (bps > 1200)
 634                 timeout = max((HZ*2560)/bps,HZ/10);
 635         else
 636                 timeout = 2*HZ;
 637         schedule_timeout_interruptible(timeout);
 638
 639         /* shutdown our urbs */
 640         dbg("%s - shutting down urbs", __FUNCTION__);
 641         usb_kill_urb(port->write_urb);
 642         usb_kill_urb(port->read_urb);
 643         usb_kill_urb(port->interrupt_in_urb);
 644
 645         if (port->tty) {
 646                 c_cflag = port->tty->termios->c_cflag;
 647                 if (c_cflag & HUPCL) {
 648                         /* drop DTR and RTS */
 649                         spin_lock_irqsave(&priv->lock, flags);
 650                         priv->line_control = 0;
 651                         spin_unlock_irqrestore (&priv->lock, flags);
 652                         set_control_lines (port->serial->dev, 0);
 653                 }
 654         }
 655 }
 656
 657 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 658                             unsigned int set, unsigned int clear)
 659 {
 660         struct pl2303_private *priv = usb_get_serial_port_data(port);
 661         unsigned long flags;
 662         u8 control;
 663
 664         if (!usb_get_intfdata(port->serial->interface))
 665                 return -ENODEV;
 666
 667         spin_lock_irqsave (&priv->lock, flags);
 668         if (set & TIOCM_RTS)
 669                 priv->line_control |= CONTROL_RTS;
 670         if (set & TIOCM_DTR)
 671                 priv->line_control |= CONTROL_DTR;
 672         if (clear & TIOCM_RTS)
 673                 priv->line_control &= ~CONTROL_RTS;
 674         if (clear & TIOCM_DTR)
 675                 priv->line_control &= ~CONTROL_DTR;
 676         control = priv->line_control;
 677         spin_unlock_irqrestore (&priv->lock, flags);
 678
 679         return set_control_lines (port->serial->dev, control);
 680 }
 681
 682 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 683 {
 684         struct pl2303_private *priv = usb_get_serial_port_data(port);
 685         unsigned long flags;
 686         unsigned int mcr;
 687         unsigned int status;
 688         unsigned int result;
 689
 690         dbg("%s (%d)", __FUNCTION__, port->number);
 691
 692         if (!usb_get_intfdata(port->serial->interface))
 693                 return -ENODEV;
 694
 695         spin_lock_irqsave (&priv->lock, flags);
 696         mcr = priv->line_control;
 697         status = priv->line_status;
 698         spin_unlock_irqrestore (&priv->lock, flags);
 699
 700         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 701                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 702                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 703                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 704                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 705                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 706
 707         dbg("%s - result = %x", __FUNCTION__, result);
 708
 709         return result;
 710 }
 711
 712 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 713 {
 714         struct pl2303_private *priv = usb_get_serial_port_data(port);
 715         unsigned long flags;
 716         unsigned int prevstatus;
 717         unsigned int status;
 718         unsigned int changed;
 719
 720         spin_lock_irqsave (&priv->lock, flags);
 721         prevstatus = priv->line_status;
 722         spin_unlock_irqrestore (&priv->lock, flags);
 723
 724         while (1) {
 725                 interruptible_sleep_on(&priv->delta_msr_wait);
 726                 /* see if a signal did it */
 727                 if (signal_pending(current))
 728                         return -ERESTARTSYS;
 729
 730                 spin_lock_irqsave (&priv->lock, flags);
 731                 status = priv->line_status;
 732                 spin_unlock_irqrestore (&priv->lock, flags);
 733
 734                 changed=prevstatus^status;
 735
 736                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 737                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 738                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 739                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 740                         return 0;
 741                 }
 742                 prevstatus = status;
 743         }
 744         /* NOTREACHED */
 745         return 0;
 746 }
 747
 748 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 749 {
 750         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 751
 752         switch (cmd) {
 753                 case TIOCMIWAIT:
 754                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 755                         return wait_modem_info(port, arg);
 756
 757                 default:
 758                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 759                         break;
 760         }
 761
 762         return -ENOIOCTLCMD;
 763 }
 764
 765 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 766 {
 767         struct usb_serial *serial = port->serial;
 768         u16 state;
 769         int result;
 770
 771         dbg("%s - port %d", __FUNCTION__, port->number);
 772
 773         if (break_state == 0)
 774                 state = BREAK_OFF;
 775         else
 776                 state = BREAK_ON;
 777         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 778
 779         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 780                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 781                                   0, NULL, 0, 100);
 782         if (result)
 783                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 784 }
 785
 786
 787 static void pl2303_shutdown (struct usb_serial *serial)
 788 {
 789         int i;
 790         struct pl2303_private *priv;
 791
 792         dbg("%s", __FUNCTION__);
 793
 794         for (i = 0; i < serial->num_ports; ++i) {
 795                 priv = usb_get_serial_port_data(serial->port[i]);
 796                 if (priv) {
 797                         pl2303_buf_free(priv->buf);
 798                         kfree(priv);
 799                         usb_set_serial_port_data(serial->port[i], NULL);
 800                 }
 801         }
 802 }
 803
 804 static void pl2303_update_line_status(struct usb_serial_port *port,
 805                                       unsigned char *data,
 806                                       unsigned int actual_length)
 807 {
 808
 809         struct pl2303_private *priv = usb_get_serial_port_data(port);
 810         unsigned long flags;
 811         u8 status_idx = UART_STATE;
 812         u8 length = UART_STATE + 1;
 813
 814         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 815             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
 816              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
 817              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
 818                 length = 1;
 819                 status_idx = 0;
 820         }
 821
 822         if (actual_length < length)
 823                 goto exit;
 824
 825         /* Save off the uart status for others to look at */
 826         spin_lock_irqsave(&priv->lock, flags);
 827         priv->line_status = data[status_idx];
 828         spin_unlock_irqrestore(&priv->lock, flags);
 829
 830 exit:
 831         return;
 832 }
 833
 834 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 835 {
 836         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 837         unsigned char *data = urb->transfer_buffer;
 838         unsigned int actual_length = urb->actual_length;
 839         int status;
 840
 841         dbg("%s (%d)", __FUNCTION__, port->number);
 842
 843         switch (urb->status) {
 844         case 0:
 845                 /* success */
 846                 break;
 847         case -ECONNRESET:
 848         case -ENOENT:
 849         case -ESHUTDOWN:
 850                 /* this urb is terminated, clean up */
 851                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 852                 return;
 853         default:
 854                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 855                 goto exit;
 856         }
 857
 858         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 859         pl2303_update_line_status(port, data, actual_length);
 860
 861 exit:
 862         status = usb_submit_urb (urb, GFP_ATOMIC);
 863         if (status)
 864                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 865                         __FUNCTION__, status);
 866 }
 867
 868
 869 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 870 {
 871         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 872         struct pl2303_private *priv = usb_get_serial_port_data(port);
 873         struct tty_struct *tty;
 874         unsigned char *data = urb->transfer_buffer;
 875         unsigned long flags;
 876         int i;
 877         int result;
 878         u8 status;
 879         char tty_flag;
 880
 881         dbg("%s - port %d", __FUNCTION__, port->number);
 882
 883         if (urb->status) {
 884                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 885                 if (!port->open_count) {
 886                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 887                         return;
 888                 }
 889                 if (urb->status == -EPROTO) {
 890                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 891                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 892                         urb->status = 0;
 893                         urb->dev = port->serial->dev;
 894                         result = usb_submit_urb(urb, GFP_ATOMIC);
 895                         if (result)
 896                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 897                         return;
 898                 }
 899                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 900                 return;
 901         }
 902
 903         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 904
 905         /* get tty_flag from status */
 906         tty_flag = TTY_NORMAL;
 907
 908         spin_lock_irqsave(&priv->lock, flags);
 909         status = priv->line_status;
 910         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 911         spin_unlock_irqrestore(&priv->lock, flags);
 912         wake_up_interruptible (&priv->delta_msr_wait);
 913
 914         /* break takes precedence over parity, */
 915         /* which takes precedence over framing errors */
 916         if (status & UART_BREAK_ERROR )
 917                 tty_flag = TTY_BREAK;
 918         else if (status & UART_PARITY_ERROR)
 919                 tty_flag = TTY_PARITY;
 920         else if (status & UART_FRAME_ERROR)
 921                 tty_flag = TTY_FRAME;
 922         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 923
 924         tty = port->tty;
 925         if (tty && urb->actual_length) {
 926                 tty_buffer_request_room(tty, urb->actual_length + 1);
 927                 /* overrun is special, not associated with a char */
 928                 if (status & UART_OVERRUN_ERROR)
 929                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 930                 for (i = 0; i < urb->actual_length; ++i)
 931                         tty_insert_flip_char (tty, data[i], tty_flag);
 932                 tty_flip_buffer_push (tty);
 933         }
 934
 935         /* Schedule the next read _if_ we are still open */
 936         if (port->open_count) {
 937                 urb->dev = port->serial->dev;
 938                 result = usb_submit_urb(urb, GFP_ATOMIC);
 939                 if (result)
 940                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 941         }
 942
 943         return;
 944 }
 945
 946
 947
 948 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 949 {
 950         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 951         struct pl2303_private *priv = usb_get_serial_port_data(port);
 952         int result;
 953
 954         dbg("%s - port %d", __FUNCTION__, port->number);
 955
 956         switch (urb->status) {
 957         case 0:
 958                 /* success */
 959                 break;
 960         case -ECONNRESET:
 961         case -ENOENT:
 962         case -ESHUTDOWN:
 963                 /* this urb is terminated, clean up */
 964                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 965                 priv->write_urb_in_use = 0;
 966                 return;
 967         default:
 968                 /* error in the urb, so we have to resubmit it */
 969                 dbg("%s - Overflow in write", __FUNCTION__);
 970                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 971                 port->write_urb->transfer_buffer_length = 1;
 972                 port->write_urb->dev = port->serial->dev;
 973                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 974                 if (result)
 975                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 976                 else
 977                         return;
 978         }
 979
 980         priv->write_urb_in_use = 0;
 981
 982         /* send any buffered data */
 983         pl2303_send(port);
 984 }
 985
 986
 987 /*
 988  * pl2303_buf_alloc
 989  *
 990  * Allocate a circular buffer and all associated memory.
 991  */
 992
 993 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
 994 {
 995
 996         struct pl2303_buf *pb;
 997
 998
 999         if (size == 0)
1000                 return NULL;
1001
1002         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1003         if (pb == NULL)
1004                 return NULL;
1005
1006         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1007         if (pb->buf_buf == NULL) {
1008                 kfree(pb);
1009                 return NULL;
1010         }
1011
1012         pb->buf_size = size;
1013         pb->buf_get = pb->buf_put = pb->buf_buf;
1014
1015         return pb;
1016
1017 }
1018
1019
1020 /*
1021  * pl2303_buf_free
1022  *
1023  * Free the buffer and all associated memory.
1024  */
1025
1026 static void pl2303_buf_free(struct pl2303_buf *pb)
1027 {
1028         if (pb) {
1029                 kfree(pb->buf_buf);
1030                 kfree(pb);
1031         }
1032 }
1033
1034
1035 /*
1036  * pl2303_buf_clear
1037  *
1038  * Clear out all data in the circular buffer.
1039  */
1040
1041 static void pl2303_buf_clear(struct pl2303_buf *pb)
1042 {
1043         if (pb != NULL)
1044                 pb->buf_get = pb->buf_put;
1045                 /* equivalent to a get of all data available */
1046 }
1047
1048
1049 /*
1050  * pl2303_buf_data_avail
1051  *
1052  * Return the number of bytes of data available in the circular
1053  * buffer.
1054  */
1055
1056 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1057 {
1058         if (pb != NULL)
1059                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1060         else
1061                 return 0;
1062 }
1063
1064
1065 /*
1066  * pl2303_buf_space_avail
1067  *
1068  * Return the number of bytes of space available in the circular
1069  * buffer.
1070  */
1071
1072 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1073 {
1074         if (pb != NULL)
1075                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1076         else
1077                 return 0;
1078 }
1079
1080
1081 /*
1082  * pl2303_buf_put
1083  *
1084  * Copy data data from a user buffer and put it into the circular buffer.
1085  * Restrict to the amount of space available.
1086  *
1087  * Return the number of bytes copied.
1088  */
1089
1090 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1091         unsigned int count)
1092 {
1093
1094         unsigned int len;
1095
1096
1097         if (pb == NULL)
1098                 return 0;
1099
1100         len  = pl2303_buf_space_avail(pb);
1101         if (count > len)
1102                 count = len;
1103
1104         if (count == 0)
1105                 return 0;
1106
1107         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1108         if (count > len) {
1109                 memcpy(pb->buf_put, buf, len);
1110                 memcpy(pb->buf_buf, buf+len, count - len);
1111                 pb->buf_put = pb->buf_buf + count - len;
1112         } else {
1113                 memcpy(pb->buf_put, buf, count);
1114                 if (count < len)
1115                         pb->buf_put += count;
1116                 else /* count == len */
1117                         pb->buf_put = pb->buf_buf;
1118         }
1119
1120         return count;
1121
1122 }
1123
1124
1125 /*
1126  * pl2303_buf_get
1127  *
1128  * Get data from the circular buffer and copy to the given buffer.
1129  * Restrict to the amount of data available.
1130  *
1131  * Return the number of bytes copied.
1132  */
1133
1134 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1135         unsigned int count)
1136 {
1137
1138         unsigned int len;
1139
1140
1141         if (pb == NULL)
1142                 return 0;
1143
1144         len = pl2303_buf_data_avail(pb);
1145         if (count > len)
1146                 count = len;
1147
1148         if (count == 0)
1149                 return 0;
1150
1151         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1152         if (count > len) {
1153                 memcpy(buf, pb->buf_get, len);
1154                 memcpy(buf+len, pb->buf_buf, count - len);
1155                 pb->buf_get = pb->buf_buf + count - len;
1156         } else {
1157                 memcpy(buf, pb->buf_get, count);
1158                 if (count < len)
1159                         pb->buf_get += count;
1160                 else /* count == len */
1161                         pb->buf_get = pb->buf_buf;
1162         }
1163
1164         return count;
1165
1166 }
1167
1168 static int __init pl2303_init (void)
1169 {
1170         int retval;
1171         retval = usb_serial_register(&pl2303_device);
1172         if (retval)
1173                 goto failed_usb_serial_register;
1174         retval = usb_register(&pl2303_driver);
1175         if (retval)
1176                 goto failed_usb_register;
1177         info(DRIVER_DESC);
1178         return 0;
1179 failed_usb_register:
1180         usb_serial_deregister(&pl2303_device);
1181 failed_usb_serial_register:
1182         return retval;
1183 }
1184
1185
1186 static void __exit pl2303_exit (void)
1187 {
1188         usb_deregister (&pl2303_driver);
1189         usb_serial_deregister (&pl2303_device);
1190 }
1191
1192
1193 module_init(pl2303_init);
1194 module_exit(pl2303_exit);
1195
1196 MODULE_DESCRIPTION(DRIVER_DESC);
1197 MODULE_LICENSE("GPL");
1198
1199 module_param(debug, bool, S_IRUGO | S_IWUSR);
1200 MODULE_PARM_DESC(debug, "Debug enabled or not");
1201