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 static DECLARE_MUTEX(pl2303_tmp_buf_sem);
  47
  48 struct pl2303_buf {
  49         unsigned int    buf_size;
  50         char            *buf_buf;
  51         char            *buf_get;
  52         char            *buf_put;
  53 };
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  57         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  58         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  59         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  60         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  61         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  62         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  63         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  64         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  65         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  66         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  67         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  68         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  69         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  70         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  71         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  72         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  73         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  75         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  76         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  77         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  78         { USB_DEVICE( NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID ) },
  79         { }                                     /* Terminating entry */
  80 };
  81
  82 MODULE_DEVICE_TABLE (usb, id_table);
  83
  84 static struct usb_driver pl2303_driver = {
  85         .name =         "pl2303",
  86         .probe =        usb_serial_probe,
  87         .disconnect =   usb_serial_disconnect,
  88         .id_table =     id_table,
  89         .no_dynamic_id =        1,
  90 };
  91
  92 #define SET_LINE_REQUEST_TYPE           0x21
  93 #define SET_LINE_REQUEST                0x20
  94
  95 #define SET_CONTROL_REQUEST_TYPE        0x21
  96 #define SET_CONTROL_REQUEST             0x22
  97 #define CONTROL_DTR                     0x01
  98 #define CONTROL_RTS                     0x02
  99
 100 #define BREAK_REQUEST_TYPE              0x21
 101 #define BREAK_REQUEST                   0x23
 102 #define BREAK_ON                        0xffff
 103 #define BREAK_OFF                       0x0000
 104
 105 #define GET_LINE_REQUEST_TYPE           0xa1
 106 #define GET_LINE_REQUEST                0x21
 107
 108 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 109 #define VENDOR_WRITE_REQUEST            0x01
 110
 111 #define VENDOR_READ_REQUEST_TYPE        0xc0
 112 #define VENDOR_READ_REQUEST             0x01
 113
 114 #define UART_STATE                      0x08
 115 #define UART_STATE_TRANSIENT_MASK       0x74
 116 #define UART_DCD                        0x01
 117 #define UART_DSR                        0x02
 118 #define UART_BREAK_ERROR                0x04
 119 #define UART_RING                       0x08
 120 #define UART_FRAME_ERROR                0x10
 121 #define UART_PARITY_ERROR               0x20
 122 #define UART_OVERRUN_ERROR              0x40
 123 #define UART_CTS                        0x80
 124
 125 /* function prototypes for a PL2303 serial converter */
 126 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 127 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 128 static void pl2303_set_termios (struct usb_serial_port *port,
 129                                 struct termios *old);
 130 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 131                          unsigned int cmd, unsigned long arg);
 132 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 133 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 134 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 135 static int pl2303_write (struct usb_serial_port *port,
 136                          const unsigned char *buf, int count);
 137 static void pl2303_send (struct usb_serial_port *port);
 138 static int pl2303_write_room(struct usb_serial_port *port);
 139 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 140 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 141 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 142 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 143                             unsigned int set, unsigned int clear);
 144 static int pl2303_startup (struct usb_serial *serial);
 145 static void pl2303_shutdown (struct usb_serial *serial);
 146 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 147 static void pl2303_buf_free(struct pl2303_buf *pb);
 148 static void pl2303_buf_clear(struct pl2303_buf *pb);
 149 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 150 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 151 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 152         unsigned int count);
 153 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 154         unsigned int count);
 155
 156
 157 /* All of the device info needed for the PL2303 SIO serial converter */
 158 static struct usb_serial_driver pl2303_device = {
 159         .driver = {
 160                 .owner =        THIS_MODULE,
 161                 .name =         "pl2303",
 162         },
 163         .id_table =             id_table,
 164         .num_interrupt_in =     NUM_DONT_CARE,
 165         .num_bulk_in =          1,
 166         .num_bulk_out =         1,
 167         .num_ports =            1,
 168         .open =                 pl2303_open,
 169         .close =                pl2303_close,
 170         .write =                pl2303_write,
 171         .ioctl =                pl2303_ioctl,
 172         .break_ctl =            pl2303_break_ctl,
 173         .set_termios =          pl2303_set_termios,
 174         .tiocmget =             pl2303_tiocmget,
 175         .tiocmset =             pl2303_tiocmset,
 176         .read_bulk_callback =   pl2303_read_bulk_callback,
 177         .read_int_callback =    pl2303_read_int_callback,
 178         .write_bulk_callback =  pl2303_write_bulk_callback,
 179         .write_room =           pl2303_write_room,
 180         .chars_in_buffer =      pl2303_chars_in_buffer,
 181         .attach =               pl2303_startup,
 182         .shutdown =             pl2303_shutdown,
 183 };
 184
 185 enum pl2303_type {
 186         type_0,         /* don't know the difference between type 0 and */
 187         type_1,         /* type 1, until someone from prolific tells us... */
 188         HX,             /* HX version of the pl2303 chip */
 189 };
 190
 191 struct pl2303_private {
 192         spinlock_t lock;
 193         struct pl2303_buf *buf;
 194         int write_urb_in_use;
 195         wait_queue_head_t delta_msr_wait;
 196         u8 line_control;
 197         u8 line_status;
 198         u8 termios_initialized;
 199         enum pl2303_type type;
 200 };
 201
 202
 203 static int pl2303_startup (struct usb_serial *serial)
 204 {
 205         struct pl2303_private *priv;
 206         enum pl2303_type type = type_0;
 207         int i;
 208
 209         if (serial->dev->descriptor.bDeviceClass == 0x02)
 210                 type = type_0;
 211         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 212                 type = HX;
 213         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 214                 type = type_1;
 215         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 216                 type = type_1;
 217         dbg("device type: %d", type);
 218
 219         for (i = 0; i < serial->num_ports; ++i) {
 220                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 221                 if (!priv)
 222                         goto cleanup;
 223                 memset (priv, 0x00, sizeof (struct pl2303_private));
 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 = kmalloc (7, GFP_KERNEL);
 386         if (!buf) {
 387                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 388                 return;
 389         }
 390         memset (buf, 0x00, 0x07);
 391
 392         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 393                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 394                              0, 0, buf, 7, 100);
 395         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 396              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 397
 398
 399         if (cflag & CSIZE) {
 400                 switch (cflag & CSIZE) {
 401                         case CS5:       buf[6] = 5;     break;
 402                         case CS6:       buf[6] = 6;     break;
 403                         case CS7:       buf[6] = 7;     break;
 404                         default:
 405                         case CS8:       buf[6] = 8;     break;
 406                 }
 407                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 408         }
 409
 410         baud = 0;
 411         switch (cflag & CBAUD) {
 412                 case B0:        baud = 0;       break;
 413                 case B75:       baud = 75;      break;
 414                 case B150:      baud = 150;     break;
 415                 case B300:      baud = 300;     break;
 416                 case B600:      baud = 600;     break;
 417                 case B1200:     baud = 1200;    break;
 418                 case B1800:     baud = 1800;    break;
 419                 case B2400:     baud = 2400;    break;
 420                 case B4800:     baud = 4800;    break;
 421                 case B9600:     baud = 9600;    break;
 422                 case B19200:    baud = 19200;   break;
 423                 case B38400:    baud = 38400;   break;
 424                 case B57600:    baud = 57600;   break;
 425                 case B115200:   baud = 115200;  break;
 426                 case B230400:   baud = 230400;  break;
 427                 case B460800:   baud = 460800;  break;
 428                 default:
 429                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 430                         break;
 431         }
 432         dbg("%s - baud = %d", __FUNCTION__, baud);
 433         if (baud) {
 434                 buf[0] = baud & 0xff;
 435                 buf[1] = (baud >> 8) & 0xff;
 436                 buf[2] = (baud >> 16) & 0xff;
 437                 buf[3] = (baud >> 24) & 0xff;
 438         }
 439
 440         /* For reference buf[4]=0 is 1 stop bits */
 441         /* For reference buf[4]=1 is 1.5 stop bits */
 442         /* For reference buf[4]=2 is 2 stop bits */
 443         if (cflag & CSTOPB) {
 444                 buf[4] = 2;
 445                 dbg("%s - stop bits = 2", __FUNCTION__);
 446         } else {
 447                 buf[4] = 0;
 448                 dbg("%s - stop bits = 1", __FUNCTION__);
 449         }
 450
 451         if (cflag & PARENB) {
 452                 /* For reference buf[5]=0 is none parity */
 453                 /* For reference buf[5]=1 is odd parity */
 454                 /* For reference buf[5]=2 is even parity */
 455                 /* For reference buf[5]=3 is mark parity */
 456                 /* For reference buf[5]=4 is space parity */
 457                 if (cflag & PARODD) {
 458                         buf[5] = 1;
 459                         dbg("%s - parity = odd", __FUNCTION__);
 460                 } else {
 461                         buf[5] = 2;
 462                         dbg("%s - parity = even", __FUNCTION__);
 463                 }
 464         } else {
 465                 buf[5] = 0;
 466                 dbg("%s - parity = none", __FUNCTION__);
 467         }
 468
 469         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 470                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 471                              0, 0, buf, 7, 100);
 472         dbg ("0x21:0x20:0:0  %d", i);
 473
 474         /* change control lines if we are switching to or from B0 */
 475         spin_lock_irqsave(&priv->lock, flags);
 476         control = priv->line_control;
 477         if ((cflag & CBAUD) == B0)
 478                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 479         else
 480                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 481         if (control != priv->line_control) {
 482                 control = priv->line_control;
 483                 spin_unlock_irqrestore(&priv->lock, flags);
 484                 set_control_lines(serial->dev, control);
 485         } else {
 486                 spin_unlock_irqrestore(&priv->lock, flags);
 487         }
 488
 489         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 490
 491         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 492                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 493                              0, 0, buf, 7, 100);
 494         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 495              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 496
 497         if (cflag & CRTSCTS) {
 498                 __u16 index;
 499                 if (priv->type == HX)
 500                         index = 0x61;
 501                 else
 502                         index = 0x41;
 503                 i = usb_control_msg(serial->dev,
 504                                     usb_sndctrlpipe(serial->dev, 0),
 505                                     VENDOR_WRITE_REQUEST,
 506                                     VENDOR_WRITE_REQUEST_TYPE,
 507                                     0x0, index, NULL, 0, 100);
 508                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 509         }
 510
 511         kfree (buf);
 512 }
 513
 514 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 515 {
 516         struct termios tmp_termios;
 517         struct usb_serial *serial = port->serial;
 518         struct pl2303_private *priv = usb_get_serial_port_data(port);
 519         unsigned char *buf;
 520         int result;
 521
 522         dbg("%s -  port %d", __FUNCTION__, port->number);
 523
 524         if (priv->type != HX) {
 525                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 526                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 527         }
 528
 529         buf = kmalloc(10, GFP_KERNEL);
 530         if (buf==NULL)
 531                 return -ENOMEM;
 532
 533 #define FISH(a,b,c,d)                                                           \
 534         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 535                                b, a, c, d, buf, 1, 100);                        \
 536         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 537
 538 #define SOUP(a,b,c,d)                                                           \
 539         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 540                                b, a, c, d, NULL, 0, 100);                       \
 541         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 542
 543         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 544         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 545         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 546         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 547         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 548         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 549         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 550         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 551         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 552         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 553
 554         if (priv->type == HX) {
 555                 /* HX chip */
 556                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 557                 /* reset upstream data pipes */
 558                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 559                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 560         } else {
 561                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 562         }
 563
 564         kfree(buf);
 565
 566         /* Setup termios */
 567         if (port->tty) {
 568                 pl2303_set_termios (port, &tmp_termios);
 569         }
 570
 571         //FIXME: need to assert RTS and DTR if CRTSCTS off
 572
 573         dbg("%s - submitting read urb", __FUNCTION__);
 574         port->read_urb->dev = serial->dev;
 575         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 576         if (result) {
 577                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 578                 pl2303_close (port, NULL);
 579                 return -EPROTO;
 580         }
 581
 582         dbg("%s - submitting interrupt urb", __FUNCTION__);
 583         port->interrupt_in_urb->dev = serial->dev;
 584         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 585         if (result) {
 586                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 587                 pl2303_close (port, NULL);
 588                 return -EPROTO;
 589         }
 590         return 0;
 591 }
 592
 593
 594 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 595 {
 596         struct pl2303_private *priv = usb_get_serial_port_data(port);
 597         unsigned long flags;
 598         unsigned int c_cflag;
 599         int bps;
 600         long timeout;
 601         wait_queue_t wait;                                              \
 602
 603         dbg("%s - port %d", __FUNCTION__, port->number);
 604
 605         /* wait for data to drain from the buffer */
 606         spin_lock_irqsave(&priv->lock, flags);
 607         timeout = PL2303_CLOSING_WAIT;
 608         init_waitqueue_entry(&wait, current);
 609         add_wait_queue(&port->tty->write_wait, &wait);
 610         for (;;) {
 611                 set_current_state(TASK_INTERRUPTIBLE);
 612                 if (pl2303_buf_data_avail(priv->buf) == 0
 613                 || timeout == 0 || signal_pending(current)
 614                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 615                         break;
 616                 spin_unlock_irqrestore(&priv->lock, flags);
 617                 timeout = schedule_timeout(timeout);
 618                 spin_lock_irqsave(&priv->lock, flags);
 619         }
 620         set_current_state(TASK_RUNNING);
 621         remove_wait_queue(&port->tty->write_wait, &wait);
 622         /* clear out any remaining data in the buffer */
 623         pl2303_buf_clear(priv->buf);
 624         spin_unlock_irqrestore(&priv->lock, flags);
 625
 626         /* wait for characters to drain from the device */
 627         /* (this is long enough for the entire 256 byte */
 628         /* pl2303 hardware buffer to drain with no flow */
 629         /* control for data rates of 1200 bps or more, */
 630         /* for lower rates we should really know how much */
 631         /* data is in the buffer to compute a delay */
 632         /* that is not unnecessarily long) */
 633         bps = tty_get_baud_rate(port->tty);
 634         if (bps > 1200)
 635                 timeout = max((HZ*2560)/bps,HZ/10);
 636         else
 637                 timeout = 2*HZ;
 638         schedule_timeout_interruptible(timeout);
 639
 640         /* shutdown our urbs */
 641         dbg("%s - shutting down urbs", __FUNCTION__);
 642         usb_kill_urb(port->write_urb);
 643         usb_kill_urb(port->read_urb);
 644         usb_kill_urb(port->interrupt_in_urb);
 645
 646         if (port->tty) {
 647                 c_cflag = port->tty->termios->c_cflag;
 648                 if (c_cflag & HUPCL) {
 649                         /* drop DTR and RTS */
 650                         spin_lock_irqsave(&priv->lock, flags);
 651                         priv->line_control = 0;
 652                         spin_unlock_irqrestore (&priv->lock, flags);
 653                         set_control_lines (port->serial->dev, 0);
 654                 }
 655         }
 656 }
 657
 658 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 659                             unsigned int set, unsigned int clear)
 660 {
 661         struct pl2303_private *priv = usb_get_serial_port_data(port);
 662         unsigned long flags;
 663         u8 control;
 664
 665         if (!usb_get_intfdata(port->serial->interface))
 666                 return -ENODEV;
 667
 668         spin_lock_irqsave (&priv->lock, flags);
 669         if (set & TIOCM_RTS)
 670                 priv->line_control |= CONTROL_RTS;
 671         if (set & TIOCM_DTR)
 672                 priv->line_control |= CONTROL_DTR;
 673         if (clear & TIOCM_RTS)
 674                 priv->line_control &= ~CONTROL_RTS;
 675         if (clear & TIOCM_DTR)
 676                 priv->line_control &= ~CONTROL_DTR;
 677         control = priv->line_control;
 678         spin_unlock_irqrestore (&priv->lock, flags);
 679
 680         return set_control_lines (port->serial->dev, control);
 681 }
 682
 683 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 684 {
 685         struct pl2303_private *priv = usb_get_serial_port_data(port);
 686         unsigned long flags;
 687         unsigned int mcr;
 688         unsigned int status;
 689         unsigned int result;
 690
 691         dbg("%s (%d)", __FUNCTION__, port->number);
 692
 693         if (!usb_get_intfdata(port->serial->interface))
 694                 return -ENODEV;
 695
 696         spin_lock_irqsave (&priv->lock, flags);
 697         mcr = priv->line_control;
 698         status = priv->line_status;
 699         spin_unlock_irqrestore (&priv->lock, flags);
 700
 701         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 702                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 703                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 704                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 705                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 706                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 707
 708         dbg("%s - result = %x", __FUNCTION__, result);
 709
 710         return result;
 711 }
 712
 713 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 714 {
 715         struct pl2303_private *priv = usb_get_serial_port_data(port);
 716         unsigned long flags;
 717         unsigned int prevstatus;
 718         unsigned int status;
 719         unsigned int changed;
 720
 721         spin_lock_irqsave (&priv->lock, flags);
 722         prevstatus = priv->line_status;
 723         spin_unlock_irqrestore (&priv->lock, flags);
 724
 725         while (1) {
 726                 interruptible_sleep_on(&priv->delta_msr_wait);
 727                 /* see if a signal did it */
 728                 if (signal_pending(current))
 729                         return -ERESTARTSYS;
 730
 731                 spin_lock_irqsave (&priv->lock, flags);
 732                 status = priv->line_status;
 733                 spin_unlock_irqrestore (&priv->lock, flags);
 734
 735                 changed=prevstatus^status;
 736
 737                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 738                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 739                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 740                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 741                         return 0;
 742                 }
 743                 prevstatus = status;
 744         }
 745         /* NOTREACHED */
 746         return 0;
 747 }
 748
 749 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 750 {
 751         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 752
 753         switch (cmd) {
 754                 case TIOCMIWAIT:
 755                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 756                         return wait_modem_info(port, arg);
 757
 758                 default:
 759                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 760                         break;
 761         }
 762
 763         return -ENOIOCTLCMD;
 764 }
 765
 766 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 767 {
 768         struct usb_serial *serial = port->serial;
 769         u16 state;
 770         int result;
 771
 772         dbg("%s - port %d", __FUNCTION__, port->number);
 773
 774         if (break_state == 0)
 775                 state = BREAK_OFF;
 776         else
 777                 state = BREAK_ON;
 778         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 779
 780         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 781                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 782                                   0, NULL, 0, 100);
 783         if (result)
 784                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 785 }
 786
 787
 788 static void pl2303_shutdown (struct usb_serial *serial)
 789 {
 790         int i;
 791         struct pl2303_private *priv;
 792
 793         dbg("%s", __FUNCTION__);
 794
 795         for (i = 0; i < serial->num_ports; ++i) {
 796                 priv = usb_get_serial_port_data(serial->port[i]);
 797                 if (priv) {
 798                         pl2303_buf_free(priv->buf);
 799                         kfree(priv);
 800                         usb_set_serial_port_data(serial->port[i], NULL);
 801                 }
 802         }
 803 }
 804
 805 static void pl2303_update_line_status(struct usb_serial_port *port,
 806                                       unsigned char *data,
 807                                       unsigned int actual_length)
 808 {
 809
 810         struct pl2303_private *priv = usb_get_serial_port_data(port);
 811         unsigned long flags;
 812         u8 status_idx = UART_STATE;
 813         u8 length = UART_STATE + 1;
 814
 815         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 816             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
 817              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
 818              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
 819                 length = 1;
 820                 status_idx = 0;
 821         }
 822
 823         if (actual_length < length)
 824                 goto exit;
 825
 826         /* Save off the uart status for others to look at */
 827         spin_lock_irqsave(&priv->lock, flags);
 828         priv->line_status = data[status_idx];
 829         spin_unlock_irqrestore(&priv->lock, flags);
 830
 831 exit:
 832         return;
 833 }
 834
 835 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 836 {
 837         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 838         unsigned char *data = urb->transfer_buffer;
 839         unsigned int actual_length = urb->actual_length;
 840         int status;
 841
 842         dbg("%s (%d)", __FUNCTION__, port->number);
 843
 844         switch (urb->status) {
 845         case 0:
 846                 /* success */
 847                 break;
 848         case -ECONNRESET:
 849         case -ENOENT:
 850         case -ESHUTDOWN:
 851                 /* this urb is terminated, clean up */
 852                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 853                 return;
 854         default:
 855                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 856                 goto exit;
 857         }
 858
 859         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 860         pl2303_update_line_status(port, data, actual_length);
 861
 862 exit:
 863         status = usb_submit_urb (urb, GFP_ATOMIC);
 864         if (status)
 865                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 866                         __FUNCTION__, status);
 867 }
 868
 869
 870 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 871 {
 872         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 873         struct pl2303_private *priv = usb_get_serial_port_data(port);
 874         struct tty_struct *tty;
 875         unsigned char *data = urb->transfer_buffer;
 876         unsigned long flags;
 877         int i;
 878         int result;
 879         u8 status;
 880         char tty_flag;
 881
 882         dbg("%s - port %d", __FUNCTION__, port->number);
 883
 884         if (urb->status) {
 885                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 886                 if (!port->open_count) {
 887                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 888                         return;
 889                 }
 890                 if (urb->status == -EPROTO) {
 891                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 892                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 893                         urb->status = 0;
 894                         urb->dev = port->serial->dev;
 895                         result = usb_submit_urb(urb, GFP_ATOMIC);
 896                         if (result)
 897                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 898                         return;
 899                 }
 900                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 901                 return;
 902         }
 903
 904         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 905
 906         /* get tty_flag from status */
 907         tty_flag = TTY_NORMAL;
 908
 909         spin_lock_irqsave(&priv->lock, flags);
 910         status = priv->line_status;
 911         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 912         spin_unlock_irqrestore(&priv->lock, flags);
 913         wake_up_interruptible (&priv->delta_msr_wait);
 914
 915         /* break takes precedence over parity, */
 916         /* which takes precedence over framing errors */
 917         if (status & UART_BREAK_ERROR )
 918                 tty_flag = TTY_BREAK;
 919         else if (status & UART_PARITY_ERROR)
 920                 tty_flag = TTY_PARITY;
 921         else if (status & UART_FRAME_ERROR)
 922                 tty_flag = TTY_FRAME;
 923         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 924
 925         tty = port->tty;
 926         if (tty && urb->actual_length) {
 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
 931                 for (i = 0; i < urb->actual_length; ++i) {
 932                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 933                                 tty_flip_buffer_push(tty);
 934                         }
 935                         tty_insert_flip_char (tty, data[i], tty_flag);
 936                 }
 937                 tty_flip_buffer_push (tty);
 938         }
 939
 940         /* Schedule the next read _if_ we are still open */
 941         if (port->open_count) {
 942                 urb->dev = port->serial->dev;
 943                 result = usb_submit_urb(urb, GFP_ATOMIC);
 944                 if (result)
 945                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 946         }
 947
 948         return;
 949 }
 950
 951
 952
 953 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 954 {
 955         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 956         struct pl2303_private *priv = usb_get_serial_port_data(port);
 957         int result;
 958
 959         dbg("%s - port %d", __FUNCTION__, port->number);
 960
 961         switch (urb->status) {
 962         case 0:
 963                 /* success */
 964                 break;
 965         case -ECONNRESET:
 966         case -ENOENT:
 967         case -ESHUTDOWN:
 968                 /* this urb is terminated, clean up */
 969                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 970                 priv->write_urb_in_use = 0;
 971                 return;
 972         default:
 973                 /* error in the urb, so we have to resubmit it */
 974                 dbg("%s - Overflow in write", __FUNCTION__);
 975                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 976                 port->write_urb->transfer_buffer_length = 1;
 977                 port->write_urb->dev = port->serial->dev;
 978                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 979                 if (result)
 980                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 981                 else
 982                         return;
 983         }
 984
 985         priv->write_urb_in_use = 0;
 986
 987         /* send any buffered data */
 988         pl2303_send(port);
 989 }
 990
 991
 992 /*
 993  * pl2303_buf_alloc
 994  *
 995  * Allocate a circular buffer and all associated memory.
 996  */
 997
 998 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
 999 {
1000
1001         struct pl2303_buf *pb;
1002
1003
1004         if (size == 0)
1005                 return NULL;
1006
1007         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1008         if (pb == NULL)
1009                 return NULL;
1010
1011         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1012         if (pb->buf_buf == NULL) {
1013                 kfree(pb);
1014                 return NULL;
1015         }
1016
1017         pb->buf_size = size;
1018         pb->buf_get = pb->buf_put = pb->buf_buf;
1019
1020         return pb;
1021
1022 }
1023
1024
1025 /*
1026  * pl2303_buf_free
1027  *
1028  * Free the buffer and all associated memory.
1029  */
1030
1031 static void pl2303_buf_free(struct pl2303_buf *pb)
1032 {
1033         if (pb) {
1034                 kfree(pb->buf_buf);
1035                 kfree(pb);
1036         }
1037 }
1038
1039
1040 /*
1041  * pl2303_buf_clear
1042  *
1043  * Clear out all data in the circular buffer.
1044  */
1045
1046 static void pl2303_buf_clear(struct pl2303_buf *pb)
1047 {
1048         if (pb != NULL)
1049                 pb->buf_get = pb->buf_put;
1050                 /* equivalent to a get of all data available */
1051 }
1052
1053
1054 /*
1055  * pl2303_buf_data_avail
1056  *
1057  * Return the number of bytes of data available in the circular
1058  * buffer.
1059  */
1060
1061 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1062 {
1063         if (pb != NULL)
1064                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1065         else
1066                 return 0;
1067 }
1068
1069
1070 /*
1071  * pl2303_buf_space_avail
1072  *
1073  * Return the number of bytes of space available in the circular
1074  * buffer.
1075  */
1076
1077 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1078 {
1079         if (pb != NULL)
1080                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1081         else
1082                 return 0;
1083 }
1084
1085
1086 /*
1087  * pl2303_buf_put
1088  *
1089  * Copy data data from a user buffer and put it into the circular buffer.
1090  * Restrict to the amount of space available.
1091  *
1092  * Return the number of bytes copied.
1093  */
1094
1095 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1096         unsigned int count)
1097 {
1098
1099         unsigned int len;
1100
1101
1102         if (pb == NULL)
1103                 return 0;
1104
1105         len  = pl2303_buf_space_avail(pb);
1106         if (count > len)
1107                 count = len;
1108
1109         if (count == 0)
1110                 return 0;
1111
1112         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1113         if (count > len) {
1114                 memcpy(pb->buf_put, buf, len);
1115                 memcpy(pb->buf_buf, buf+len, count - len);
1116                 pb->buf_put = pb->buf_buf + count - len;
1117         } else {
1118                 memcpy(pb->buf_put, buf, count);
1119                 if (count < len)
1120                         pb->buf_put += count;
1121                 else /* count == len */
1122                         pb->buf_put = pb->buf_buf;
1123         }
1124
1125         return count;
1126
1127 }
1128
1129
1130 /*
1131  * pl2303_buf_get
1132  *
1133  * Get data from the circular buffer and copy to the given buffer.
1134  * Restrict to the amount of data available.
1135  *
1136  * Return the number of bytes copied.
1137  */
1138
1139 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1140         unsigned int count)
1141 {
1142
1143         unsigned int len;
1144
1145
1146         if (pb == NULL)
1147                 return 0;
1148
1149         len = pl2303_buf_data_avail(pb);
1150         if (count > len)
1151                 count = len;
1152
1153         if (count == 0)
1154                 return 0;
1155
1156         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1157         if (count > len) {
1158                 memcpy(buf, pb->buf_get, len);
1159                 memcpy(buf+len, pb->buf_buf, count - len);
1160                 pb->buf_get = pb->buf_buf + count - len;
1161         } else {
1162                 memcpy(buf, pb->buf_get, count);
1163                 if (count < len)
1164                         pb->buf_get += count;
1165                 else /* count == len */
1166                         pb->buf_get = pb->buf_buf;
1167         }
1168
1169         return count;
1170
1171 }
1172
1173 static int __init pl2303_init (void)
1174 {
1175         int retval;
1176         retval = usb_serial_register(&pl2303_device);
1177         if (retval)
1178                 goto failed_usb_serial_register;
1179         retval = usb_register(&pl2303_driver);
1180         if (retval)
1181                 goto failed_usb_register;
1182         info(DRIVER_DESC);
1183         return 0;
1184 failed_usb_register:
1185         usb_serial_deregister(&pl2303_device);
1186 failed_usb_serial_register:
1187         return retval;
1188 }
1189
1190
1191 static void __exit pl2303_exit (void)
1192 {
1193         usb_deregister (&pl2303_driver);
1194         usb_serial_deregister (&pl2303_device);
1195 }
1196
1197
1198 module_init(pl2303_init);
1199 module_exit(pl2303_exit);
1200
1201 MODULE_DESCRIPTION(DRIVER_DESC);
1202 MODULE_LICENSE("GPL");
1203
1204 module_param(debug, bool, S_IRUGO | S_IWUSR);
1205 MODULE_PARM_DESC(debug, "Debug enabled or not");
1206