err.no 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, or
  12  *      (at your option) any later version.
  13  *
  14  * See Documentation/usb/usb-serial.txt for more information on using this driver
  15  *
  16  * 2002_Mar_26 gkh
  17  *      allowed driver to work properly if there is no tty assigned to a port
  18  *      (this happens for serial console devices.)
  19  *
  20  * 2001_Oct_06 gkh
  21  *      Added RTS and DTR line control.  Thanks to joe@bndlg.de for parts of it.
  22  *
  23  * 2001_Sep_19 gkh
  24  *      Added break support.
  25  *
  26  * 2001_Aug_30 gkh
  27  *      fixed oops in write_bulk_callback.
  28  *
  29  * 2001_Aug_28 gkh
  30  *      reworked buffer logic to be like other usb-serial drivers.  Hopefully
  31  *      removing some reported problems.
  32  *
  33  * 2001_Jun_06 gkh
  34  *      finished porting to 2.4 format.
  35  *
  36  */
  37
  38 #include <linux/config.h>
  39 #include <linux/kernel.h>
  40 #include <linux/errno.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/tty.h>
  44 #include <linux/tty_driver.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/module.h>
  48 #include <linux/moduleparam.h>
  49 #include <linux/spinlock.h>
  50 #include <asm/uaccess.h>
  51 #include <linux/usb.h>
  52 #include "usb-serial.h"
  53 #include "pl2303.h"
  54
  55 /*
  56  * Version Information
  57  */
  58 #define DRIVER_VERSION "v0.12"
  59 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  60
  61 static int debug;
  62
  63 #define PL2303_CLOSING_WAIT     (30*HZ)
  64
  65 #define PL2303_BUF_SIZE         1024
  66 #define PL2303_TMP_BUF_SIZE     1024
  67
  68 static DECLARE_MUTEX(pl2303_tmp_buf_sem);
  69
  70 struct pl2303_buf {
  71         unsigned int    buf_size;
  72         char            *buf_buf;
  73         char            *buf_get;
  74         char            *buf_put;
  75 };
  76
  77 static struct usb_device_id id_table [] = {
  78         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  79         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  80         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  81         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  82         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  83         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  84         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  85         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  86         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  87         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  88         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  89         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  90         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  91         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  92         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  93         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  94         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  95         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  96         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  97         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  98         { USB_DEVICE( NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID ) },
  99         { }                                     /* Terminating entry */
 100 };
 101
 102 MODULE_DEVICE_TABLE (usb, id_table);
 103
 104 static struct usb_driver pl2303_driver = {
 105         .owner =        THIS_MODULE,
 106         .name =         "pl2303",
 107         .probe =        usb_serial_probe,
 108         .disconnect =   usb_serial_disconnect,
 109         .id_table =     id_table,
 110 };
 111
 112 #define SET_LINE_REQUEST_TYPE           0x21
 113 #define SET_LINE_REQUEST                0x20
 114
 115 #define SET_CONTROL_REQUEST_TYPE        0x21
 116 #define SET_CONTROL_REQUEST             0x22
 117 #define CONTROL_DTR                     0x01
 118 #define CONTROL_RTS                     0x02
 119
 120 #define BREAK_REQUEST_TYPE              0x21
 121 #define BREAK_REQUEST                   0x23
 122 #define BREAK_ON                        0xffff
 123 #define BREAK_OFF                       0x0000
 124
 125 #define GET_LINE_REQUEST_TYPE           0xa1
 126 #define GET_LINE_REQUEST                0x21
 127
 128 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 129 #define VENDOR_WRITE_REQUEST            0x01
 130
 131 #define VENDOR_READ_REQUEST_TYPE        0xc0
 132 #define VENDOR_READ_REQUEST             0x01
 133
 134 #define UART_STATE                      0x08
 135 #define UART_STATE_TRANSIENT_MASK       0x74
 136 #define UART_DCD                        0x01
 137 #define UART_DSR                        0x02
 138 #define UART_BREAK_ERROR                0x04
 139 #define UART_RING                       0x08
 140 #define UART_FRAME_ERROR                0x10
 141 #define UART_PARITY_ERROR               0x20
 142 #define UART_OVERRUN_ERROR              0x40
 143 #define UART_CTS                        0x80
 144
 145 /* function prototypes for a PL2303 serial converter */
 146 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 147 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 148 static void pl2303_set_termios (struct usb_serial_port *port,
 149                                 struct termios *old);
 150 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 151                          unsigned int cmd, unsigned long arg);
 152 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 153 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 154 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 155 static int pl2303_write (struct usb_serial_port *port,
 156                          const unsigned char *buf, int count);
 157 static void pl2303_send (struct usb_serial_port *port);
 158 static int pl2303_write_room(struct usb_serial_port *port);
 159 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 160 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 161 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 162 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 163                             unsigned int set, unsigned int clear);
 164 static int pl2303_startup (struct usb_serial *serial);
 165 static void pl2303_shutdown (struct usb_serial *serial);
 166 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 167 static void pl2303_buf_free(struct pl2303_buf *pb);
 168 static void pl2303_buf_clear(struct pl2303_buf *pb);
 169 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 170 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 171 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 172         unsigned int count);
 173 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 174         unsigned int count);
 175
 176
 177 /* All of the device info needed for the PL2303 SIO serial converter */
 178 static struct usb_serial_driver pl2303_device = {
 179         .driver = {
 180                 .owner =        THIS_MODULE,
 181         },
 182         .name =                 "PL-2303",
 183         .id_table =             id_table,
 184         .num_interrupt_in =     NUM_DONT_CARE,
 185         .num_bulk_in =          1,
 186         .num_bulk_out =         1,
 187         .num_ports =            1,
 188         .open =                 pl2303_open,
 189         .close =                pl2303_close,
 190         .write =                pl2303_write,
 191         .ioctl =                pl2303_ioctl,
 192         .break_ctl =            pl2303_break_ctl,
 193         .set_termios =          pl2303_set_termios,
 194         .tiocmget =             pl2303_tiocmget,
 195         .tiocmset =             pl2303_tiocmset,
 196         .read_bulk_callback =   pl2303_read_bulk_callback,
 197         .read_int_callback =    pl2303_read_int_callback,
 198         .write_bulk_callback =  pl2303_write_bulk_callback,
 199         .write_room =           pl2303_write_room,
 200         .chars_in_buffer =      pl2303_chars_in_buffer,
 201         .attach =               pl2303_startup,
 202         .shutdown =             pl2303_shutdown,
 203 };
 204
 205 enum pl2303_type {
 206         type_0,         /* don't know the difference between type 0 and */
 207         type_1,         /* type 1, until someone from prolific tells us... */
 208         HX,             /* HX version of the pl2303 chip */
 209 };
 210
 211 struct pl2303_private {
 212         spinlock_t lock;
 213         struct pl2303_buf *buf;
 214         int write_urb_in_use;
 215         wait_queue_head_t delta_msr_wait;
 216         u8 line_control;
 217         u8 line_status;
 218         u8 termios_initialized;
 219         enum pl2303_type type;
 220 };
 221
 222
 223 static int pl2303_startup (struct usb_serial *serial)
 224 {
 225         struct pl2303_private *priv;
 226         enum pl2303_type type = type_0;
 227         int i;
 228
 229         if (serial->dev->descriptor.bDeviceClass == 0x02)
 230                 type = type_0;
 231         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 232                 type = HX;
 233         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 234                 type = type_1;
 235         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 236                 type = type_1;
 237         dbg("device type: %d", type);
 238
 239         for (i = 0; i < serial->num_ports; ++i) {
 240                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 241                 if (!priv)
 242                         goto cleanup;
 243                 memset (priv, 0x00, sizeof (struct pl2303_private));
 244                 spin_lock_init(&priv->lock);
 245                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 246                 if (priv->buf == NULL) {
 247                         kfree(priv);
 248                         goto cleanup;
 249                 }
 250                 init_waitqueue_head(&priv->delta_msr_wait);
 251                 priv->type = type;
 252                 usb_set_serial_port_data(serial->port[i], priv);
 253         }
 254         return 0;
 255
 256 cleanup:
 257         for (--i; i>=0; --i) {
 258                 priv = usb_get_serial_port_data(serial->port[i]);
 259                 pl2303_buf_free(priv->buf);
 260                 kfree(priv);
 261                 usb_set_serial_port_data(serial->port[i], NULL);
 262         }
 263         return -ENOMEM;
 264 }
 265
 266 static int set_control_lines (struct usb_device *dev, u8 value)
 267 {
 268         int retval;
 269
 270         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 271                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 272                                   value, 0, NULL, 0, 100);
 273         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 274         return retval;
 275 }
 276
 277 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 278 {
 279         struct pl2303_private *priv = usb_get_serial_port_data(port);
 280         unsigned long flags;
 281
 282         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 283
 284         if (!count)
 285                 return count;
 286
 287         spin_lock_irqsave(&priv->lock, flags);
 288         count = pl2303_buf_put(priv->buf, buf, count);
 289         spin_unlock_irqrestore(&priv->lock, flags);
 290
 291         pl2303_send(port);
 292
 293         return count;
 294 }
 295
 296 static void pl2303_send(struct usb_serial_port *port)
 297 {
 298         int count, result;
 299         struct pl2303_private *priv = usb_get_serial_port_data(port);
 300         unsigned long flags;
 301
 302         dbg("%s - port %d", __FUNCTION__, port->number);
 303
 304         spin_lock_irqsave(&priv->lock, flags);
 305
 306         if (priv->write_urb_in_use) {
 307                 spin_unlock_irqrestore(&priv->lock, flags);
 308                 return;
 309         }
 310
 311         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 312                 port->bulk_out_size);
 313
 314         if (count == 0) {
 315                 spin_unlock_irqrestore(&priv->lock, flags);
 316                 return;
 317         }
 318
 319         priv->write_urb_in_use = 1;
 320
 321         spin_unlock_irqrestore(&priv->lock, flags);
 322
 323         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 324
 325         port->write_urb->transfer_buffer_length = count;
 326         port->write_urb->dev = port->serial->dev;
 327         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 328         if (result) {
 329                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 330                 priv->write_urb_in_use = 0;
 331                 // TODO: reschedule pl2303_send
 332         }
 333
 334         schedule_work(&port->work);
 335 }
 336
 337 static int pl2303_write_room(struct usb_serial_port *port)
 338 {
 339         struct pl2303_private *priv = usb_get_serial_port_data(port);
 340         int room = 0;
 341         unsigned long flags;
 342
 343         dbg("%s - port %d", __FUNCTION__, port->number);
 344
 345         spin_lock_irqsave(&priv->lock, flags);
 346         room = pl2303_buf_space_avail(priv->buf);
 347         spin_unlock_irqrestore(&priv->lock, flags);
 348
 349         dbg("%s - returns %d", __FUNCTION__, room);
 350         return room;
 351 }
 352
 353 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 354 {
 355         struct pl2303_private *priv = usb_get_serial_port_data(port);
 356         int chars = 0;
 357         unsigned long flags;
 358
 359         dbg("%s - port %d", __FUNCTION__, port->number);
 360
 361         spin_lock_irqsave(&priv->lock, flags);
 362         chars = pl2303_buf_data_avail(priv->buf);
 363         spin_unlock_irqrestore(&priv->lock, flags);
 364
 365         dbg("%s - returns %d", __FUNCTION__, chars);
 366         return chars;
 367 }
 368
 369 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 370 {
 371         struct usb_serial *serial = port->serial;
 372         struct pl2303_private *priv = usb_get_serial_port_data(port);
 373         unsigned long flags;
 374         unsigned int cflag;
 375         unsigned char *buf;
 376         int baud;
 377         int i;
 378         u8 control;
 379
 380         dbg("%s -  port %d", __FUNCTION__, port->number);
 381
 382         if ((!port->tty) || (!port->tty->termios)) {
 383                 dbg("%s - no tty structures", __FUNCTION__);
 384                 return;
 385         }
 386
 387         spin_lock_irqsave(&priv->lock, flags);
 388         if (!priv->termios_initialized) {
 389                 *(port->tty->termios) = tty_std_termios;
 390                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 391                 priv->termios_initialized = 1;
 392         }
 393         spin_unlock_irqrestore(&priv->lock, flags);
 394
 395         cflag = port->tty->termios->c_cflag;
 396         /* check that they really want us to change something */
 397         if (old_termios) {
 398                 if ((cflag == old_termios->c_cflag) &&
 399                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 400                     dbg("%s - nothing to change...", __FUNCTION__);
 401                     return;
 402                 }
 403         }
 404
 405         buf = kmalloc (7, GFP_KERNEL);
 406         if (!buf) {
 407                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 408                 return;
 409         }
 410         memset (buf, 0x00, 0x07);
 411
 412         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 413                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 414                              0, 0, buf, 7, 100);
 415         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 416              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 417
 418
 419         if (cflag & CSIZE) {
 420                 switch (cflag & CSIZE) {
 421                         case CS5:       buf[6] = 5;     break;
 422                         case CS6:       buf[6] = 6;     break;
 423                         case CS7:       buf[6] = 7;     break;
 424                         default:
 425                         case CS8:       buf[6] = 8;     break;
 426                 }
 427                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 428         }
 429
 430         baud = 0;
 431         switch (cflag & CBAUD) {
 432                 case B0:        baud = 0;       break;
 433                 case B75:       baud = 75;      break;
 434                 case B150:      baud = 150;     break;
 435                 case B300:      baud = 300;     break;
 436                 case B600:      baud = 600;     break;
 437                 case B1200:     baud = 1200;    break;
 438                 case B1800:     baud = 1800;    break;
 439                 case B2400:     baud = 2400;    break;
 440                 case B4800:     baud = 4800;    break;
 441                 case B9600:     baud = 9600;    break;
 442                 case B19200:    baud = 19200;   break;
 443                 case B38400:    baud = 38400;   break;
 444                 case B57600:    baud = 57600;   break;
 445                 case B115200:   baud = 115200;  break;
 446                 case B230400:   baud = 230400;  break;
 447                 case B460800:   baud = 460800;  break;
 448                 default:
 449                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 450                         break;
 451         }
 452         dbg("%s - baud = %d", __FUNCTION__, baud);
 453         if (baud) {
 454                 buf[0] = baud & 0xff;
 455                 buf[1] = (baud >> 8) & 0xff;
 456                 buf[2] = (baud >> 16) & 0xff;
 457                 buf[3] = (baud >> 24) & 0xff;
 458         }
 459
 460         /* For reference buf[4]=0 is 1 stop bits */
 461         /* For reference buf[4]=1 is 1.5 stop bits */
 462         /* For reference buf[4]=2 is 2 stop bits */
 463         if (cflag & CSTOPB) {
 464                 buf[4] = 2;
 465                 dbg("%s - stop bits = 2", __FUNCTION__);
 466         } else {
 467                 buf[4] = 0;
 468                 dbg("%s - stop bits = 1", __FUNCTION__);
 469         }
 470
 471         if (cflag & PARENB) {
 472                 /* For reference buf[5]=0 is none parity */
 473                 /* For reference buf[5]=1 is odd parity */
 474                 /* For reference buf[5]=2 is even parity */
 475                 /* For reference buf[5]=3 is mark parity */
 476                 /* For reference buf[5]=4 is space parity */
 477                 if (cflag & PARODD) {
 478                         buf[5] = 1;
 479                         dbg("%s - parity = odd", __FUNCTION__);
 480                 } else {
 481                         buf[5] = 2;
 482                         dbg("%s - parity = even", __FUNCTION__);
 483                 }
 484         } else {
 485                 buf[5] = 0;
 486                 dbg("%s - parity = none", __FUNCTION__);
 487         }
 488
 489         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 490                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 491                              0, 0, buf, 7, 100);
 492         dbg ("0x21:0x20:0:0  %d", i);
 493
 494         /* change control lines if we are switching to or from B0 */
 495         spin_lock_irqsave(&priv->lock, flags);
 496         control = priv->line_control;
 497         if ((cflag & CBAUD) == B0)
 498                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 499         else
 500                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 501         if (control != priv->line_control) {
 502                 control = priv->line_control;
 503                 spin_unlock_irqrestore(&priv->lock, flags);
 504                 set_control_lines(serial->dev, control);
 505         } else {
 506                 spin_unlock_irqrestore(&priv->lock, flags);
 507         }
 508
 509         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 510
 511         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 512                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 513                              0, 0, buf, 7, 100);
 514         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 515              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 516
 517         if (cflag & CRTSCTS) {
 518                 __u16 index;
 519                 if (priv->type == HX)
 520                         index = 0x61;
 521                 else
 522                         index = 0x41;
 523                 i = usb_control_msg(serial->dev,
 524                                     usb_sndctrlpipe(serial->dev, 0),
 525                                     VENDOR_WRITE_REQUEST,
 526                                     VENDOR_WRITE_REQUEST_TYPE,
 527                                     0x0, index, NULL, 0, 100);
 528                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 529         }
 530
 531         kfree (buf);
 532 }
 533
 534 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 535 {
 536         struct termios tmp_termios;
 537         struct usb_serial *serial = port->serial;
 538         struct pl2303_private *priv = usb_get_serial_port_data(port);
 539         unsigned char *buf;
 540         int result;
 541
 542         dbg("%s -  port %d", __FUNCTION__, port->number);
 543
 544         if (priv->type != HX) {
 545                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 546                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 547         }
 548
 549         buf = kmalloc(10, GFP_KERNEL);
 550         if (buf==NULL)
 551                 return -ENOMEM;
 552
 553 #define FISH(a,b,c,d)                                                           \
 554         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 555                                b, a, c, d, buf, 1, 100);                        \
 556         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 557
 558 #define SOUP(a,b,c,d)                                                           \
 559         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 560                                b, a, c, d, NULL, 0, 100);                       \
 561         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 562
 563         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 564         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 565         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 566         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 567         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 568         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 569         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 570         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 571         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 572         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 573
 574         if (priv->type == HX) {
 575                 /* HX chip */
 576                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 577                 /* reset upstream data pipes */
 578                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 579                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 580         } else {
 581                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 582         }
 583
 584         kfree(buf);
 585
 586         /* Setup termios */
 587         if (port->tty) {
 588                 pl2303_set_termios (port, &tmp_termios);
 589         }
 590
 591         //FIXME: need to assert RTS and DTR if CRTSCTS off
 592
 593         dbg("%s - submitting read urb", __FUNCTION__);
 594         port->read_urb->dev = serial->dev;
 595         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 596         if (result) {
 597                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 598                 pl2303_close (port, NULL);
 599                 return -EPROTO;
 600         }
 601
 602         dbg("%s - submitting interrupt urb", __FUNCTION__);
 603         port->interrupt_in_urb->dev = serial->dev;
 604         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 605         if (result) {
 606                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 607                 pl2303_close (port, NULL);
 608                 return -EPROTO;
 609         }
 610         return 0;
 611 }
 612
 613
 614 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 615 {
 616         struct pl2303_private *priv = usb_get_serial_port_data(port);
 617         unsigned long flags;
 618         unsigned int c_cflag;
 619         int bps;
 620         long timeout;
 621         wait_queue_t wait;                                              \
 622
 623         dbg("%s - port %d", __FUNCTION__, port->number);
 624
 625         /* wait for data to drain from the buffer */
 626         spin_lock_irqsave(&priv->lock, flags);
 627         timeout = PL2303_CLOSING_WAIT;
 628         init_waitqueue_entry(&wait, current);
 629         add_wait_queue(&port->tty->write_wait, &wait);
 630         for (;;) {
 631                 set_current_state(TASK_INTERRUPTIBLE);
 632                 if (pl2303_buf_data_avail(priv->buf) == 0
 633                 || timeout == 0 || signal_pending(current)
 634                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 635                         break;
 636                 spin_unlock_irqrestore(&priv->lock, flags);
 637                 timeout = schedule_timeout(timeout);
 638                 spin_lock_irqsave(&priv->lock, flags);
 639         }
 640         set_current_state(TASK_RUNNING);
 641         remove_wait_queue(&port->tty->write_wait, &wait);
 642         /* clear out any remaining data in the buffer */
 643         pl2303_buf_clear(priv->buf);
 644         spin_unlock_irqrestore(&priv->lock, flags);
 645
 646         /* wait for characters to drain from the device */
 647         /* (this is long enough for the entire 256 byte */
 648         /* pl2303 hardware buffer to drain with no flow */
 649         /* control for data rates of 1200 bps or more, */
 650         /* for lower rates we should really know how much */
 651         /* data is in the buffer to compute a delay */
 652         /* that is not unnecessarily long) */
 653         bps = tty_get_baud_rate(port->tty);
 654         if (bps > 1200)
 655                 timeout = max((HZ*2560)/bps,HZ/10);
 656         else
 657                 timeout = 2*HZ;
 658         schedule_timeout_interruptible(timeout);
 659
 660         /* shutdown our urbs */
 661         dbg("%s - shutting down urbs", __FUNCTION__);
 662         usb_kill_urb(port->write_urb);
 663         usb_kill_urb(port->read_urb);
 664         usb_kill_urb(port->interrupt_in_urb);
 665
 666         if (port->tty) {
 667                 c_cflag = port->tty->termios->c_cflag;
 668                 if (c_cflag & HUPCL) {
 669                         /* drop DTR and RTS */
 670                         spin_lock_irqsave(&priv->lock, flags);
 671                         priv->line_control = 0;
 672                         spin_unlock_irqrestore (&priv->lock, flags);
 673                         set_control_lines (port->serial->dev, 0);
 674                 }
 675         }
 676 }
 677
 678 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 679                             unsigned int set, unsigned int clear)
 680 {
 681         struct pl2303_private *priv = usb_get_serial_port_data(port);
 682         unsigned long flags;
 683         u8 control;
 684
 685         if (!usb_get_intfdata(port->serial->interface))
 686                 return -ENODEV;
 687
 688         spin_lock_irqsave (&priv->lock, flags);
 689         if (set & TIOCM_RTS)
 690                 priv->line_control |= CONTROL_RTS;
 691         if (set & TIOCM_DTR)
 692                 priv->line_control |= CONTROL_DTR;
 693         if (clear & TIOCM_RTS)
 694                 priv->line_control &= ~CONTROL_RTS;
 695         if (clear & TIOCM_DTR)
 696                 priv->line_control &= ~CONTROL_DTR;
 697         control = priv->line_control;
 698         spin_unlock_irqrestore (&priv->lock, flags);
 699
 700         return set_control_lines (port->serial->dev, control);
 701 }
 702
 703 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 704 {
 705         struct pl2303_private *priv = usb_get_serial_port_data(port);
 706         unsigned long flags;
 707         unsigned int mcr;
 708         unsigned int status;
 709         unsigned int result;
 710
 711         dbg("%s (%d)", __FUNCTION__, port->number);
 712
 713         if (!usb_get_intfdata(port->serial->interface))
 714                 return -ENODEV;
 715
 716         spin_lock_irqsave (&priv->lock, flags);
 717         mcr = priv->line_control;
 718         status = priv->line_status;
 719         spin_unlock_irqrestore (&priv->lock, flags);
 720
 721         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 722                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 723                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 724                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 725                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 726                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 727
 728         dbg("%s - result = %x", __FUNCTION__, result);
 729
 730         return result;
 731 }
 732
 733 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 734 {
 735         struct pl2303_private *priv = usb_get_serial_port_data(port);
 736         unsigned long flags;
 737         unsigned int prevstatus;
 738         unsigned int status;
 739         unsigned int changed;
 740
 741         spin_lock_irqsave (&priv->lock, flags);
 742         prevstatus = priv->line_status;
 743         spin_unlock_irqrestore (&priv->lock, flags);
 744
 745         while (1) {
 746                 interruptible_sleep_on(&priv->delta_msr_wait);
 747                 /* see if a signal did it */
 748                 if (signal_pending(current))
 749                         return -ERESTARTSYS;
 750
 751                 spin_lock_irqsave (&priv->lock, flags);
 752                 status = priv->line_status;
 753                 spin_unlock_irqrestore (&priv->lock, flags);
 754
 755                 changed=prevstatus^status;
 756
 757                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 758                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 759                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 760                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 761                         return 0;
 762                 }
 763                 prevstatus = status;
 764         }
 765         /* NOTREACHED */
 766         return 0;
 767 }
 768
 769 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 770 {
 771         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 772
 773         switch (cmd) {
 774                 case TIOCMIWAIT:
 775                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 776                         return wait_modem_info(port, arg);
 777
 778                 default:
 779                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 780                         break;
 781         }
 782
 783         return -ENOIOCTLCMD;
 784 }
 785
 786 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 787 {
 788         struct usb_serial *serial = port->serial;
 789         u16 state;
 790         int result;
 791
 792         dbg("%s - port %d", __FUNCTION__, port->number);
 793
 794         if (break_state == 0)
 795                 state = BREAK_OFF;
 796         else
 797                 state = BREAK_ON;
 798         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 799
 800         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 801                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 802                                   0, NULL, 0, 100);
 803         if (result)
 804                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 805 }
 806
 807
 808 static void pl2303_shutdown (struct usb_serial *serial)
 809 {
 810         int i;
 811         struct pl2303_private *priv;
 812
 813         dbg("%s", __FUNCTION__);
 814
 815         for (i = 0; i < serial->num_ports; ++i) {
 816                 priv = usb_get_serial_port_data(serial->port[i]);
 817                 if (priv) {
 818                         pl2303_buf_free(priv->buf);
 819                         kfree(priv);
 820                         usb_set_serial_port_data(serial->port[i], NULL);
 821                 }
 822         }
 823 }
 824
 825 static void pl2303_update_line_status(struct usb_serial_port *port,
 826                                       unsigned char *data,
 827                                       unsigned int actual_length)
 828 {
 829
 830         struct pl2303_private *priv = usb_get_serial_port_data(port);
 831         unsigned long flags;
 832         u8 status_idx = UART_STATE;
 833         u8 length = UART_STATE;
 834
 835         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 836             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65)) {
 837                 length = 1;
 838                 status_idx = 0;
 839         }
 840
 841         if (actual_length < length)
 842                 goto exit;
 843
 844         /* Save off the uart status for others to look at */
 845         spin_lock_irqsave(&priv->lock, flags);
 846         priv->line_status = data[status_idx];
 847         spin_unlock_irqrestore(&priv->lock, flags);
 848
 849 exit:
 850         return;
 851 }
 852
 853 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 854 {
 855         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 856         unsigned char *data = urb->transfer_buffer;
 857         unsigned int actual_length = urb->actual_length;
 858         int status;
 859
 860         dbg("%s (%d)", __FUNCTION__, port->number);
 861
 862         switch (urb->status) {
 863         case 0:
 864                 /* success */
 865                 break;
 866         case -ECONNRESET:
 867         case -ENOENT:
 868         case -ESHUTDOWN:
 869                 /* this urb is terminated, clean up */
 870                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 871                 return;
 872         default:
 873                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 874                 goto exit;
 875         }
 876
 877         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 878         pl2303_update_line_status(port, data, actual_length);
 879
 880 exit:
 881         status = usb_submit_urb (urb, GFP_ATOMIC);
 882         if (status)
 883                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 884                         __FUNCTION__, status);
 885 }
 886
 887
 888 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 889 {
 890         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 891         struct pl2303_private *priv = usb_get_serial_port_data(port);
 892         struct tty_struct *tty;
 893         unsigned char *data = urb->transfer_buffer;
 894         unsigned long flags;
 895         int i;
 896         int result;
 897         u8 status;
 898         char tty_flag;
 899
 900         dbg("%s - port %d", __FUNCTION__, port->number);
 901
 902         if (urb->status) {
 903                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 904                 if (!port->open_count) {
 905                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 906                         return;
 907                 }
 908                 if (urb->status == -EPROTO) {
 909                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 910                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 911                         urb->status = 0;
 912                         urb->dev = port->serial->dev;
 913                         result = usb_submit_urb(urb, GFP_ATOMIC);
 914                         if (result)
 915                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 916                         return;
 917                 }
 918                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 919                 return;
 920         }
 921
 922         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 923
 924         /* get tty_flag from status */
 925         tty_flag = TTY_NORMAL;
 926
 927         spin_lock_irqsave(&priv->lock, flags);
 928         status = priv->line_status;
 929         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 930         spin_unlock_irqrestore(&priv->lock, flags);
 931         wake_up_interruptible (&priv->delta_msr_wait);
 932
 933         /* break takes precedence over parity, */
 934         /* which takes precedence over framing errors */
 935         if (status & UART_BREAK_ERROR )
 936                 tty_flag = TTY_BREAK;
 937         else if (status & UART_PARITY_ERROR)
 938                 tty_flag = TTY_PARITY;
 939         else if (status & UART_FRAME_ERROR)
 940                 tty_flag = TTY_FRAME;
 941         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 942
 943         tty = port->tty;
 944         if (tty && urb->actual_length) {
 945                 /* overrun is special, not associated with a char */
 946                 if (status & UART_OVERRUN_ERROR)
 947                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 948
 949                 for (i = 0; i < urb->actual_length; ++i) {
 950                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 951                                 tty_flip_buffer_push(tty);
 952                         }
 953                         tty_insert_flip_char (tty, data[i], tty_flag);
 954                 }
 955                 tty_flip_buffer_push (tty);
 956         }
 957
 958         /* Schedule the next read _if_ we are still open */
 959         if (port->open_count) {
 960                 urb->dev = port->serial->dev;
 961                 result = usb_submit_urb(urb, GFP_ATOMIC);
 962                 if (result)
 963                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 964         }
 965
 966         return;
 967 }
 968
 969
 970
 971 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 972 {
 973         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 974         struct pl2303_private *priv = usb_get_serial_port_data(port);
 975         int result;
 976
 977         dbg("%s - port %d", __FUNCTION__, port->number);
 978
 979         switch (urb->status) {
 980         case 0:
 981                 /* success */
 982                 break;
 983         case -ECONNRESET:
 984         case -ENOENT:
 985         case -ESHUTDOWN:
 986                 /* this urb is terminated, clean up */
 987                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 988                 priv->write_urb_in_use = 0;
 989                 return;
 990         default:
 991                 /* error in the urb, so we have to resubmit it */
 992                 dbg("%s - Overflow in write", __FUNCTION__);
 993                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 994                 port->write_urb->transfer_buffer_length = 1;
 995                 port->write_urb->dev = port->serial->dev;
 996                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 997                 if (result)
 998                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 999                 else
1000                         return;
1001         }
1002
1003         priv->write_urb_in_use = 0;
1004
1005         /* send any buffered data */
1006         pl2303_send(port);
1007 }
1008
1009
1010 /*
1011  * pl2303_buf_alloc
1012  *
1013  * Allocate a circular buffer and all associated memory.
1014  */
1015
1016 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
1017 {
1018
1019         struct pl2303_buf *pb;
1020
1021
1022         if (size == 0)
1023                 return NULL;
1024
1025         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1026         if (pb == NULL)
1027                 return NULL;
1028
1029         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1030         if (pb->buf_buf == NULL) {
1031                 kfree(pb);
1032                 return NULL;
1033         }
1034
1035         pb->buf_size = size;
1036         pb->buf_get = pb->buf_put = pb->buf_buf;
1037
1038         return pb;
1039
1040 }
1041
1042
1043 /*
1044  * pl2303_buf_free
1045  *
1046  * Free the buffer and all associated memory.
1047  */
1048
1049 static void pl2303_buf_free(struct pl2303_buf *pb)
1050 {
1051         if (pb) {
1052                 kfree(pb->buf_buf);
1053                 kfree(pb);
1054         }
1055 }
1056
1057
1058 /*
1059  * pl2303_buf_clear
1060  *
1061  * Clear out all data in the circular buffer.
1062  */
1063
1064 static void pl2303_buf_clear(struct pl2303_buf *pb)
1065 {
1066         if (pb != NULL)
1067                 pb->buf_get = pb->buf_put;
1068                 /* equivalent to a get of all data available */
1069 }
1070
1071
1072 /*
1073  * pl2303_buf_data_avail
1074  *
1075  * Return the number of bytes of data available in the circular
1076  * buffer.
1077  */
1078
1079 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1080 {
1081         if (pb != NULL)
1082                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1083         else
1084                 return 0;
1085 }
1086
1087
1088 /*
1089  * pl2303_buf_space_avail
1090  *
1091  * Return the number of bytes of space available in the circular
1092  * buffer.
1093  */
1094
1095 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1096 {
1097         if (pb != NULL)
1098                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1099         else
1100                 return 0;
1101 }
1102
1103
1104 /*
1105  * pl2303_buf_put
1106  *
1107  * Copy data data from a user buffer and put it into the circular buffer.
1108  * Restrict to the amount of space available.
1109  *
1110  * Return the number of bytes copied.
1111  */
1112
1113 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1114         unsigned int count)
1115 {
1116
1117         unsigned int len;
1118
1119
1120         if (pb == NULL)
1121                 return 0;
1122
1123         len  = pl2303_buf_space_avail(pb);
1124         if (count > len)
1125                 count = len;
1126
1127         if (count == 0)
1128                 return 0;
1129
1130         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1131         if (count > len) {
1132                 memcpy(pb->buf_put, buf, len);
1133                 memcpy(pb->buf_buf, buf+len, count - len);
1134                 pb->buf_put = pb->buf_buf + count - len;
1135         } else {
1136                 memcpy(pb->buf_put, buf, count);
1137                 if (count < len)
1138                         pb->buf_put += count;
1139                 else /* count == len */
1140                         pb->buf_put = pb->buf_buf;
1141         }
1142
1143         return count;
1144
1145 }
1146
1147
1148 /*
1149  * pl2303_buf_get
1150  *
1151  * Get data from the circular buffer and copy to the given buffer.
1152  * Restrict to the amount of data available.
1153  *
1154  * Return the number of bytes copied.
1155  */
1156
1157 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1158         unsigned int count)
1159 {
1160
1161         unsigned int len;
1162
1163
1164         if (pb == NULL)
1165                 return 0;
1166
1167         len = pl2303_buf_data_avail(pb);
1168         if (count > len)
1169                 count = len;
1170
1171         if (count == 0)
1172                 return 0;
1173
1174         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1175         if (count > len) {
1176                 memcpy(buf, pb->buf_get, len);
1177                 memcpy(buf+len, pb->buf_buf, count - len);
1178                 pb->buf_get = pb->buf_buf + count - len;
1179         } else {
1180                 memcpy(buf, pb->buf_get, count);
1181                 if (count < len)
1182                         pb->buf_get += count;
1183                 else /* count == len */
1184                         pb->buf_get = pb->buf_buf;
1185         }
1186
1187         return count;
1188
1189 }
1190
1191 static int __init pl2303_init (void)
1192 {
1193         int retval;
1194         retval = usb_serial_register(&pl2303_device);
1195         if (retval)
1196                 goto failed_usb_serial_register;
1197         retval = usb_register(&pl2303_driver);
1198         if (retval)
1199                 goto failed_usb_register;
1200         info(DRIVER_DESC " " DRIVER_VERSION);
1201         return 0;
1202 failed_usb_register:
1203         usb_serial_deregister(&pl2303_device);
1204 failed_usb_serial_register:
1205         return retval;
1206 }
1207
1208
1209 static void __exit pl2303_exit (void)
1210 {
1211         usb_deregister (&pl2303_driver);
1212         usb_serial_deregister (&pl2303_device);
1213 }
1214
1215
1216 module_init(pl2303_init);
1217 module_exit(pl2303_exit);
1218
1219 MODULE_DESCRIPTION(DRIVER_DESC);
1220 MODULE_VERSION(DRIVER_VERSION);
1221 MODULE_LICENSE("GPL");
1222
1223 module_param(debug, bool, S_IRUGO | S_IWUSR);
1224 MODULE_PARM_DESC(debug, "Debug enabled or not");
1225