git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2003 IBM Corp.
   6  *
   7  * Original driver for 2.2.x by anonymous
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this driver
  14  *
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_driver.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/serial.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/spinlock.h>
  29 #include <asm/uaccess.h>
  30 #include <linux/usb.h>
  31 #include "usb-serial.h"
  32 #include "pl2303.h"
  33
  34 /*
  35  * Version Information
  36  */
  37 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  38
  39 static int debug;
  40
  41 #define PL2303_CLOSING_WAIT     (30*HZ)
  42
  43 #define PL2303_BUF_SIZE         1024
  44 #define PL2303_TMP_BUF_SIZE     1024
  45
  46 struct pl2303_buf {
  47         unsigned int    buf_size;
  48         char            *buf_buf;
  49         char            *buf_get;
  50         char            *buf_put;
  51 };
  52
  53 static struct usb_device_id id_table [] = {
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  56         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  57         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  58         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  59         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  60         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  61         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  62         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  63         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  64         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  65         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  66         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  67         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  68         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  69         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  70         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  71         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  72         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  75         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  76         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  77         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  78         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  79         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  80         { }                                     /* Terminating entry */
  81 };
  82
  83 MODULE_DEVICE_TABLE (usb, id_table);
  84
  85 static struct usb_driver pl2303_driver = {
  86         .name =         "pl2303",
  87         .probe =        usb_serial_probe,
  88         .disconnect =   usb_serial_disconnect,
  89         .id_table =     id_table,
  90         .no_dynamic_id =        1,
  91 };
  92
  93 #define SET_LINE_REQUEST_TYPE           0x21
  94 #define SET_LINE_REQUEST                0x20
  95
  96 #define SET_CONTROL_REQUEST_TYPE        0x21
  97 #define SET_CONTROL_REQUEST             0x22
  98 #define CONTROL_DTR                     0x01
  99 #define CONTROL_RTS                     0x02
 100
 101 #define BREAK_REQUEST_TYPE              0x21
 102 #define BREAK_REQUEST                   0x23
 103 #define BREAK_ON                        0xffff
 104 #define BREAK_OFF                       0x0000
 105
 106 #define GET_LINE_REQUEST_TYPE           0xa1
 107 #define GET_LINE_REQUEST                0x21
 108
 109 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 110 #define VENDOR_WRITE_REQUEST            0x01
 111
 112 #define VENDOR_READ_REQUEST_TYPE        0xc0
 113 #define VENDOR_READ_REQUEST             0x01
 114
 115 #define UART_STATE                      0x08
 116 #define UART_STATE_TRANSIENT_MASK       0x74
 117 #define UART_DCD                        0x01
 118 #define UART_DSR                        0x02
 119 #define UART_BREAK_ERROR                0x04
 120 #define UART_RING                       0x08
 121 #define UART_FRAME_ERROR                0x10
 122 #define UART_PARITY_ERROR               0x20
 123 #define UART_OVERRUN_ERROR              0x40
 124 #define UART_CTS                        0x80
 125
 126 /* function prototypes for a PL2303 serial converter */
 127 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 128 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 129 static void pl2303_set_termios (struct usb_serial_port *port,
 130                                 struct termios *old);
 131 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 132                          unsigned int cmd, unsigned long arg);
 133 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 134 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 135 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 136 static int pl2303_write (struct usb_serial_port *port,
 137                          const unsigned char *buf, int count);
 138 static void pl2303_send (struct usb_serial_port *port);
 139 static int pl2303_write_room(struct usb_serial_port *port);
 140 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 141 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 142 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 143 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 144                             unsigned int set, unsigned int clear);
 145 static int pl2303_startup (struct usb_serial *serial);
 146 static void pl2303_shutdown (struct usb_serial *serial);
 147 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 148 static void pl2303_buf_free(struct pl2303_buf *pb);
 149 static void pl2303_buf_clear(struct pl2303_buf *pb);
 150 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 151 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 152 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 153         unsigned int count);
 154 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 155         unsigned int count);
 156
 157
 158 /* All of the device info needed for the PL2303 SIO serial converter */
 159 static struct usb_serial_driver pl2303_device = {
 160         .driver = {
 161                 .owner =        THIS_MODULE,
 162                 .name =         "pl2303",
 163         },
 164         .id_table =             id_table,
 165         .num_interrupt_in =     NUM_DONT_CARE,
 166         .num_bulk_in =          1,
 167         .num_bulk_out =         1,
 168         .num_ports =            1,
 169         .open =                 pl2303_open,
 170         .close =                pl2303_close,
 171         .write =                pl2303_write,
 172         .ioctl =                pl2303_ioctl,
 173         .break_ctl =            pl2303_break_ctl,
 174         .set_termios =          pl2303_set_termios,
 175         .tiocmget =             pl2303_tiocmget,
 176         .tiocmset =             pl2303_tiocmset,
 177         .read_bulk_callback =   pl2303_read_bulk_callback,
 178         .read_int_callback =    pl2303_read_int_callback,
 179         .write_bulk_callback =  pl2303_write_bulk_callback,
 180         .write_room =           pl2303_write_room,
 181         .chars_in_buffer =      pl2303_chars_in_buffer,
 182         .attach =               pl2303_startup,
 183         .shutdown =             pl2303_shutdown,
 184 };
 185
 186 enum pl2303_type {
 187         type_0,         /* don't know the difference between type 0 and */
 188         type_1,         /* type 1, until someone from prolific tells us... */
 189         HX,             /* HX version of the pl2303 chip */
 190 };
 191
 192 struct pl2303_private {
 193         spinlock_t lock;
 194         struct pl2303_buf *buf;
 195         int write_urb_in_use;
 196         wait_queue_head_t delta_msr_wait;
 197         u8 line_control;
 198         u8 line_status;
 199         u8 termios_initialized;
 200         enum pl2303_type type;
 201 };
 202
 203
 204 static int pl2303_startup (struct usb_serial *serial)
 205 {
 206         struct pl2303_private *priv;
 207         enum pl2303_type type = type_0;
 208         int i;
 209
 210         if (serial->dev->descriptor.bDeviceClass == 0x02)
 211                 type = type_0;
 212         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 213                 type = HX;
 214         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 215                 type = type_1;
 216         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 217                 type = type_1;
 218         dbg("device type: %d", type);
 219
 220         for (i = 0; i < serial->num_ports; ++i) {
 221                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 222                 if (!priv)
 223                         goto cleanup;
 224                 memset (priv, 0x00, sizeof (struct pl2303_private));
 225                 spin_lock_init(&priv->lock);
 226                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 227                 if (priv->buf == NULL) {
 228                         kfree(priv);
 229                         goto cleanup;
 230                 }
 231                 init_waitqueue_head(&priv->delta_msr_wait);
 232                 priv->type = type;
 233                 usb_set_serial_port_data(serial->port[i], priv);
 234         }
 235         return 0;
 236
 237 cleanup:
 238         for (--i; i>=0; --i) {
 239                 priv = usb_get_serial_port_data(serial->port[i]);
 240                 pl2303_buf_free(priv->buf);
 241                 kfree(priv);
 242                 usb_set_serial_port_data(serial->port[i], NULL);
 243         }
 244         return -ENOMEM;
 245 }
 246
 247 static int set_control_lines (struct usb_device *dev, u8 value)
 248 {
 249         int retval;
 250
 251         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 252                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 253                                   value, 0, NULL, 0, 100);
 254         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 255         return retval;
 256 }
 257
 258 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 259 {
 260         struct pl2303_private *priv = usb_get_serial_port_data(port);
 261         unsigned long flags;
 262
 263         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 264
 265         if (!count)
 266                 return count;
 267
 268         spin_lock_irqsave(&priv->lock, flags);
 269         count = pl2303_buf_put(priv->buf, buf, count);
 270         spin_unlock_irqrestore(&priv->lock, flags);
 271
 272         pl2303_send(port);
 273
 274         return count;
 275 }
 276
 277 static void pl2303_send(struct usb_serial_port *port)
 278 {
 279         int count, result;
 280         struct pl2303_private *priv = usb_get_serial_port_data(port);
 281         unsigned long flags;
 282
 283         dbg("%s - port %d", __FUNCTION__, port->number);
 284
 285         spin_lock_irqsave(&priv->lock, flags);
 286
 287         if (priv->write_urb_in_use) {
 288                 spin_unlock_irqrestore(&priv->lock, flags);
 289                 return;
 290         }
 291
 292         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 293                 port->bulk_out_size);
 294
 295         if (count == 0) {
 296                 spin_unlock_irqrestore(&priv->lock, flags);
 297                 return;
 298         }
 299
 300         priv->write_urb_in_use = 1;
 301
 302         spin_unlock_irqrestore(&priv->lock, flags);
 303
 304         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 305
 306         port->write_urb->transfer_buffer_length = count;
 307         port->write_urb->dev = port->serial->dev;
 308         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 309         if (result) {
 310                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 311                 priv->write_urb_in_use = 0;
 312                 // TODO: reschedule pl2303_send
 313         }
 314
 315         schedule_work(&port->work);
 316 }
 317
 318 static int pl2303_write_room(struct usb_serial_port *port)
 319 {
 320         struct pl2303_private *priv = usb_get_serial_port_data(port);
 321         int room = 0;
 322         unsigned long flags;
 323
 324         dbg("%s - port %d", __FUNCTION__, port->number);
 325
 326         spin_lock_irqsave(&priv->lock, flags);
 327         room = pl2303_buf_space_avail(priv->buf);
 328         spin_unlock_irqrestore(&priv->lock, flags);
 329
 330         dbg("%s - returns %d", __FUNCTION__, room);
 331         return room;
 332 }
 333
 334 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 335 {
 336         struct pl2303_private *priv = usb_get_serial_port_data(port);
 337         int chars = 0;
 338         unsigned long flags;
 339
 340         dbg("%s - port %d", __FUNCTION__, port->number);
 341
 342         spin_lock_irqsave(&priv->lock, flags);
 343         chars = pl2303_buf_data_avail(priv->buf);
 344         spin_unlock_irqrestore(&priv->lock, flags);
 345
 346         dbg("%s - returns %d", __FUNCTION__, chars);
 347         return chars;
 348 }
 349
 350 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 351 {
 352         struct usb_serial *serial = port->serial;
 353         struct pl2303_private *priv = usb_get_serial_port_data(port);
 354         unsigned long flags;
 355         unsigned int cflag;
 356         unsigned char *buf;
 357         int baud;
 358         int i;
 359         u8 control;
 360
 361         dbg("%s -  port %d", __FUNCTION__, port->number);
 362
 363         if ((!port->tty) || (!port->tty->termios)) {
 364                 dbg("%s - no tty structures", __FUNCTION__);
 365                 return;
 366         }
 367
 368         spin_lock_irqsave(&priv->lock, flags);
 369         if (!priv->termios_initialized) {
 370                 *(port->tty->termios) = tty_std_termios;
 371                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 372                 priv->termios_initialized = 1;
 373         }
 374         spin_unlock_irqrestore(&priv->lock, flags);
 375
 376         cflag = port->tty->termios->c_cflag;
 377         /* check that they really want us to change something */
 378         if (old_termios) {
 379                 if ((cflag == old_termios->c_cflag) &&
 380                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 381                     dbg("%s - nothing to change...", __FUNCTION__);
 382                     return;
 383                 }
 384         }
 385
 386         buf = kmalloc (7, GFP_KERNEL);
 387         if (!buf) {
 388                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 389                 return;
 390         }
 391         memset (buf, 0x00, 0x07);
 392
 393         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 394                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 395                              0, 0, buf, 7, 100);
 396         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 397              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 398
 399
 400         if (cflag & CSIZE) {
 401                 switch (cflag & CSIZE) {
 402                         case CS5:       buf[6] = 5;     break;
 403                         case CS6:       buf[6] = 6;     break;
 404                         case CS7:       buf[6] = 7;     break;
 405                         default:
 406                         case CS8:       buf[6] = 8;     break;
 407                 }
 408                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 409         }
 410
 411         baud = 0;
 412         switch (cflag & CBAUD) {
 413                 case B0:        baud = 0;       break;
 414                 case B75:       baud = 75;      break;
 415                 case B150:      baud = 150;     break;
 416                 case B300:      baud = 300;     break;
 417                 case B600:      baud = 600;     break;
 418                 case B1200:     baud = 1200;    break;
 419                 case B1800:     baud = 1800;    break;
 420                 case B2400:     baud = 2400;    break;
 421                 case B4800:     baud = 4800;    break;
 422                 case B9600:     baud = 9600;    break;
 423                 case B19200:    baud = 19200;   break;
 424                 case B38400:    baud = 38400;   break;
 425                 case B57600:    baud = 57600;   break;
 426                 case B115200:   baud = 115200;  break;
 427                 case B230400:   baud = 230400;  break;
 428                 case B460800:   baud = 460800;  break;
 429                 default:
 430                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 431                         break;
 432         }
 433         dbg("%s - baud = %d", __FUNCTION__, baud);
 434         if (baud) {
 435                 buf[0] = baud & 0xff;
 436                 buf[1] = (baud >> 8) & 0xff;
 437                 buf[2] = (baud >> 16) & 0xff;
 438                 buf[3] = (baud >> 24) & 0xff;
 439         }
 440
 441         /* For reference buf[4]=0 is 1 stop bits */
 442         /* For reference buf[4]=1 is 1.5 stop bits */
 443         /* For reference buf[4]=2 is 2 stop bits */
 444         if (cflag & CSTOPB) {
 445                 buf[4] = 2;
 446                 dbg("%s - stop bits = 2", __FUNCTION__);
 447         } else {
 448                 buf[4] = 0;
 449                 dbg("%s - stop bits = 1", __FUNCTION__);
 450         }
 451
 452         if (cflag & PARENB) {
 453                 /* For reference buf[5]=0 is none parity */
 454                 /* For reference buf[5]=1 is odd parity */
 455                 /* For reference buf[5]=2 is even parity */
 456                 /* For reference buf[5]=3 is mark parity */
 457                 /* For reference buf[5]=4 is space parity */
 458                 if (cflag & PARODD) {
 459                         buf[5] = 1;
 460                         dbg("%s - parity = odd", __FUNCTION__);
 461                 } else {
 462                         buf[5] = 2;
 463                         dbg("%s - parity = even", __FUNCTION__);
 464                 }
 465         } else {
 466                 buf[5] = 0;
 467                 dbg("%s - parity = none", __FUNCTION__);
 468         }
 469
 470         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 471                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 472                              0, 0, buf, 7, 100);
 473         dbg ("0x21:0x20:0:0  %d", i);
 474
 475         /* change control lines if we are switching to or from B0 */
 476         spin_lock_irqsave(&priv->lock, flags);
 477         control = priv->line_control;
 478         if ((cflag & CBAUD) == B0)
 479                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 480         else
 481                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 482         if (control != priv->line_control) {
 483                 control = priv->line_control;
 484                 spin_unlock_irqrestore(&priv->lock, flags);
 485                 set_control_lines(serial->dev, control);
 486         } else {
 487                 spin_unlock_irqrestore(&priv->lock, flags);
 488         }
 489
 490         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 491
 492         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 493                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 494                              0, 0, buf, 7, 100);
 495         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 496              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 497
 498         if (cflag & CRTSCTS) {
 499                 __u16 index;
 500                 if (priv->type == HX)
 501                         index = 0x61;
 502                 else
 503                         index = 0x41;
 504                 i = usb_control_msg(serial->dev,
 505                                     usb_sndctrlpipe(serial->dev, 0),
 506                                     VENDOR_WRITE_REQUEST,
 507                                     VENDOR_WRITE_REQUEST_TYPE,
 508                                     0x0, index, NULL, 0, 100);
 509                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 510         }
 511
 512         kfree (buf);
 513 }
 514
 515 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 516 {
 517         struct termios tmp_termios;
 518         struct usb_serial *serial = port->serial;
 519         struct pl2303_private *priv = usb_get_serial_port_data(port);
 520         unsigned char *buf;
 521         int result;
 522
 523         dbg("%s -  port %d", __FUNCTION__, port->number);
 524
 525         if (priv->type != HX) {
 526                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 527                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 528         }
 529
 530         buf = kmalloc(10, GFP_KERNEL);
 531         if (buf==NULL)
 532                 return -ENOMEM;
 533
 534 #define FISH(a,b,c,d)                                                           \
 535         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 536                                b, a, c, d, buf, 1, 100);                        \
 537         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 538
 539 #define SOUP(a,b,c,d)                                                           \
 540         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 541                                b, a, c, d, NULL, 0, 100);                       \
 542         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 543
 544         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 545         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 546         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 547         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 548         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 549         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 550         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 551         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 552         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 553         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 554
 555         if (priv->type == HX) {
 556                 /* HX chip */
 557                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 558                 /* reset upstream data pipes */
 559                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 560                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 561         } else {
 562                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 563         }
 564
 565         kfree(buf);
 566
 567         /* Setup termios */
 568         if (port->tty) {
 569                 pl2303_set_termios (port, &tmp_termios);
 570         }
 571
 572         //FIXME: need to assert RTS and DTR if CRTSCTS off
 573
 574         dbg("%s - submitting read urb", __FUNCTION__);
 575         port->read_urb->dev = serial->dev;
 576         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 577         if (result) {
 578                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 579                 pl2303_close (port, NULL);
 580                 return -EPROTO;
 581         }
 582
 583         dbg("%s - submitting interrupt urb", __FUNCTION__);
 584         port->interrupt_in_urb->dev = serial->dev;
 585         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 586         if (result) {
 587                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 588                 pl2303_close (port, NULL);
 589                 return -EPROTO;
 590         }
 591         return 0;
 592 }
 593
 594
 595 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 596 {
 597         struct pl2303_private *priv = usb_get_serial_port_data(port);
 598         unsigned long flags;
 599         unsigned int c_cflag;
 600         int bps;
 601         long timeout;
 602         wait_queue_t wait;                                              \
 603
 604         dbg("%s - port %d", __FUNCTION__, port->number);
 605
 606         /* wait for data to drain from the buffer */
 607         spin_lock_irqsave(&priv->lock, flags);
 608         timeout = PL2303_CLOSING_WAIT;
 609         init_waitqueue_entry(&wait, current);
 610         add_wait_queue(&port->tty->write_wait, &wait);
 611         for (;;) {
 612                 set_current_state(TASK_INTERRUPTIBLE);
 613                 if (pl2303_buf_data_avail(priv->buf) == 0
 614                 || timeout == 0 || signal_pending(current)
 615                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 616                         break;
 617                 spin_unlock_irqrestore(&priv->lock, flags);
 618                 timeout = schedule_timeout(timeout);
 619                 spin_lock_irqsave(&priv->lock, flags);
 620         }
 621         set_current_state(TASK_RUNNING);
 622         remove_wait_queue(&port->tty->write_wait, &wait);
 623         /* clear out any remaining data in the buffer */
 624         pl2303_buf_clear(priv->buf);
 625         spin_unlock_irqrestore(&priv->lock, flags);
 626
 627         /* wait for characters to drain from the device */
 628         /* (this is long enough for the entire 256 byte */
 629         /* pl2303 hardware buffer to drain with no flow */
 630         /* control for data rates of 1200 bps or more, */
 631         /* for lower rates we should really know how much */
 632         /* data is in the buffer to compute a delay */
 633         /* that is not unnecessarily long) */
 634         bps = tty_get_baud_rate(port->tty);
 635         if (bps > 1200)
 636                 timeout = max((HZ*2560)/bps,HZ/10);
 637         else
 638                 timeout = 2*HZ;
 639         schedule_timeout_interruptible(timeout);
 640
 641         /* shutdown our urbs */
 642         dbg("%s - shutting down urbs", __FUNCTION__);
 643         usb_kill_urb(port->write_urb);
 644         usb_kill_urb(port->read_urb);
 645         usb_kill_urb(port->interrupt_in_urb);
 646
 647         if (port->tty) {
 648                 c_cflag = port->tty->termios->c_cflag;
 649                 if (c_cflag & HUPCL) {
 650                         /* drop DTR and RTS */
 651                         spin_lock_irqsave(&priv->lock, flags);
 652                         priv->line_control = 0;
 653                         spin_unlock_irqrestore (&priv->lock, flags);
 654                         set_control_lines (port->serial->dev, 0);
 655                 }
 656         }
 657 }
 658
 659 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 660                             unsigned int set, unsigned int clear)
 661 {
 662         struct pl2303_private *priv = usb_get_serial_port_data(port);
 663         unsigned long flags;
 664         u8 control;
 665
 666         if (!usb_get_intfdata(port->serial->interface))
 667                 return -ENODEV;
 668
 669         spin_lock_irqsave (&priv->lock, flags);
 670         if (set & TIOCM_RTS)
 671                 priv->line_control |= CONTROL_RTS;
 672         if (set & TIOCM_DTR)
 673                 priv->line_control |= CONTROL_DTR;
 674         if (clear & TIOCM_RTS)
 675                 priv->line_control &= ~CONTROL_RTS;
 676         if (clear & TIOCM_DTR)
 677                 priv->line_control &= ~CONTROL_DTR;
 678         control = priv->line_control;
 679         spin_unlock_irqrestore (&priv->lock, flags);
 680
 681         return set_control_lines (port->serial->dev, control);
 682 }
 683
 684 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 685 {
 686         struct pl2303_private *priv = usb_get_serial_port_data(port);
 687         unsigned long flags;
 688         unsigned int mcr;
 689         unsigned int status;
 690         unsigned int result;
 691
 692         dbg("%s (%d)", __FUNCTION__, port->number);
 693
 694         if (!usb_get_intfdata(port->serial->interface))
 695                 return -ENODEV;
 696
 697         spin_lock_irqsave (&priv->lock, flags);
 698         mcr = priv->line_control;
 699         status = priv->line_status;
 700         spin_unlock_irqrestore (&priv->lock, flags);
 701
 702         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 703                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 704                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 705                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 706                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 707                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 708
 709         dbg("%s - result = %x", __FUNCTION__, result);
 710
 711         return result;
 712 }
 713
 714 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 715 {
 716         struct pl2303_private *priv = usb_get_serial_port_data(port);
 717         unsigned long flags;
 718         unsigned int prevstatus;
 719         unsigned int status;
 720         unsigned int changed;
 721
 722         spin_lock_irqsave (&priv->lock, flags);
 723         prevstatus = priv->line_status;
 724         spin_unlock_irqrestore (&priv->lock, flags);
 725
 726         while (1) {
 727                 interruptible_sleep_on(&priv->delta_msr_wait);
 728                 /* see if a signal did it */
 729                 if (signal_pending(current))
 730                         return -ERESTARTSYS;
 731
 732                 spin_lock_irqsave (&priv->lock, flags);
 733                 status = priv->line_status;
 734                 spin_unlock_irqrestore (&priv->lock, flags);
 735
 736                 changed=prevstatus^status;
 737
 738                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 739                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 740                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 741                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 742                         return 0;
 743                 }
 744                 prevstatus = status;
 745         }
 746         /* NOTREACHED */
 747         return 0;
 748 }
 749
 750 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 751 {
 752         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 753
 754         switch (cmd) {
 755                 case TIOCMIWAIT:
 756                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 757                         return wait_modem_info(port, arg);
 758
 759                 default:
 760                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 761                         break;
 762         }
 763
 764         return -ENOIOCTLCMD;
 765 }
 766
 767 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 768 {
 769         struct usb_serial *serial = port->serial;
 770         u16 state;
 771         int result;
 772
 773         dbg("%s - port %d", __FUNCTION__, port->number);
 774
 775         if (break_state == 0)
 776                 state = BREAK_OFF;
 777         else
 778                 state = BREAK_ON;
 779         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 780
 781         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 782                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 783                                   0, NULL, 0, 100);
 784         if (result)
 785                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 786 }
 787
 788
 789 static void pl2303_shutdown (struct usb_serial *serial)
 790 {
 791         int i;
 792         struct pl2303_private *priv;
 793
 794         dbg("%s", __FUNCTION__);
 795
 796         for (i = 0; i < serial->num_ports; ++i) {
 797                 priv = usb_get_serial_port_data(serial->port[i]);
 798                 if (priv) {
 799                         pl2303_buf_free(priv->buf);
 800                         kfree(priv);
 801                         usb_set_serial_port_data(serial->port[i], NULL);
 802                 }
 803         }
 804 }
 805
 806 static void pl2303_update_line_status(struct usb_serial_port *port,
 807                                       unsigned char *data,
 808                                       unsigned int actual_length)
 809 {
 810
 811         struct pl2303_private *priv = usb_get_serial_port_data(port);
 812         unsigned long flags;
 813         u8 status_idx = UART_STATE;
 814         u8 length = UART_STATE + 1;
 815
 816         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 817             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
 818              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
 819              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
 820                 length = 1;
 821                 status_idx = 0;
 822         }
 823
 824         if (actual_length < length)
 825                 goto exit;
 826
 827         /* Save off the uart status for others to look at */
 828         spin_lock_irqsave(&priv->lock, flags);
 829         priv->line_status = data[status_idx];
 830         spin_unlock_irqrestore(&priv->lock, flags);
 831
 832 exit:
 833         return;
 834 }
 835
 836 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 837 {
 838         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 839         unsigned char *data = urb->transfer_buffer;
 840         unsigned int actual_length = urb->actual_length;
 841         int status;
 842
 843         dbg("%s (%d)", __FUNCTION__, port->number);
 844
 845         switch (urb->status) {
 846         case 0:
 847                 /* success */
 848                 break;
 849         case -ECONNRESET:
 850         case -ENOENT:
 851         case -ESHUTDOWN:
 852                 /* this urb is terminated, clean up */
 853                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 854                 return;
 855         default:
 856                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 857                 goto exit;
 858         }
 859
 860         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 861         pl2303_update_line_status(port, data, actual_length);
 862
 863 exit:
 864         status = usb_submit_urb (urb, GFP_ATOMIC);
 865         if (status)
 866                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 867                         __FUNCTION__, status);
 868 }
 869
 870
 871 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 872 {
 873         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 874         struct pl2303_private *priv = usb_get_serial_port_data(port);
 875         struct tty_struct *tty;
 876         unsigned char *data = urb->transfer_buffer;
 877         unsigned long flags;
 878         int i;
 879         int result;
 880         u8 status;
 881         char tty_flag;
 882
 883         dbg("%s - port %d", __FUNCTION__, port->number);
 884
 885         if (urb->status) {
 886                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 887                 if (!port->open_count) {
 888                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 889                         return;
 890                 }
 891                 if (urb->status == -EPROTO) {
 892                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 893                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 894                         urb->status = 0;
 895                         urb->dev = port->serial->dev;
 896                         result = usb_submit_urb(urb, GFP_ATOMIC);
 897                         if (result)
 898                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 899                         return;
 900                 }
 901                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 902                 return;
 903         }
 904
 905         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 906
 907         /* get tty_flag from status */
 908         tty_flag = TTY_NORMAL;
 909
 910         spin_lock_irqsave(&priv->lock, flags);
 911         status = priv->line_status;
 912         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 913         spin_unlock_irqrestore(&priv->lock, flags);
 914         wake_up_interruptible (&priv->delta_msr_wait);
 915
 916         /* break takes precedence over parity, */
 917         /* which takes precedence over framing errors */
 918         if (status & UART_BREAK_ERROR )
 919                 tty_flag = TTY_BREAK;
 920         else if (status & UART_PARITY_ERROR)
 921                 tty_flag = TTY_PARITY;
 922         else if (status & UART_FRAME_ERROR)
 923                 tty_flag = TTY_FRAME;
 924         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 925
 926         tty = port->tty;
 927         if (tty && urb->actual_length) {
 928                 tty_buffer_request_room(tty, urb->actual_length + 1);
 929                 /* overrun is special, not associated with a char */
 930                 if (status & UART_OVERRUN_ERROR)
 931                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 932                 for (i = 0; i < urb->actual_length; ++i)
 933                         tty_insert_flip_char (tty, data[i], tty_flag);
 934                 tty_flip_buffer_push (tty);
 935         }
 936
 937         /* Schedule the next read _if_ we are still open */
 938         if (port->open_count) {
 939                 urb->dev = port->serial->dev;
 940                 result = usb_submit_urb(urb, GFP_ATOMIC);
 941                 if (result)
 942                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 943         }
 944
 945         return;
 946 }
 947
 948
 949
 950 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 951 {
 952         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 953         struct pl2303_private *priv = usb_get_serial_port_data(port);
 954         int result;
 955
 956         dbg("%s - port %d", __FUNCTION__, port->number);
 957
 958         switch (urb->status) {
 959         case 0:
 960                 /* success */
 961                 break;
 962         case -ECONNRESET:
 963         case -ENOENT:
 964         case -ESHUTDOWN:
 965                 /* this urb is terminated, clean up */
 966                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 967                 priv->write_urb_in_use = 0;
 968                 return;
 969         default:
 970                 /* error in the urb, so we have to resubmit it */
 971                 dbg("%s - Overflow in write", __FUNCTION__);
 972                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 973                 port->write_urb->transfer_buffer_length = 1;
 974                 port->write_urb->dev = port->serial->dev;
 975                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 976                 if (result)
 977                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 978                 else
 979                         return;
 980         }
 981
 982         priv->write_urb_in_use = 0;
 983
 984         /* send any buffered data */
 985         pl2303_send(port);
 986 }
 987
 988
 989 /*
 990  * pl2303_buf_alloc
 991  *
 992  * Allocate a circular buffer and all associated memory.
 993  */
 994
 995 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
 996 {
 997
 998         struct pl2303_buf *pb;
 999
1000
1001         if (size == 0)
1002                 return NULL;
1003
1004         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1005         if (pb == NULL)
1006                 return NULL;
1007
1008         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1009         if (pb->buf_buf == NULL) {
1010                 kfree(pb);
1011                 return NULL;
1012         }
1013
1014         pb->buf_size = size;
1015         pb->buf_get = pb->buf_put = pb->buf_buf;
1016
1017         return pb;
1018
1019 }
1020
1021
1022 /*
1023  * pl2303_buf_free
1024  *
1025  * Free the buffer and all associated memory.
1026  */
1027
1028 static void pl2303_buf_free(struct pl2303_buf *pb)
1029 {
1030         if (pb) {
1031                 kfree(pb->buf_buf);
1032                 kfree(pb);
1033         }
1034 }
1035
1036
1037 /*
1038  * pl2303_buf_clear
1039  *
1040  * Clear out all data in the circular buffer.
1041  */
1042
1043 static void pl2303_buf_clear(struct pl2303_buf *pb)
1044 {
1045         if (pb != NULL)
1046                 pb->buf_get = pb->buf_put;
1047                 /* equivalent to a get of all data available */
1048 }
1049
1050
1051 /*
1052  * pl2303_buf_data_avail
1053  *
1054  * Return the number of bytes of data available in the circular
1055  * buffer.
1056  */
1057
1058 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1059 {
1060         if (pb != NULL)
1061                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1062         else
1063                 return 0;
1064 }
1065
1066
1067 /*
1068  * pl2303_buf_space_avail
1069  *
1070  * Return the number of bytes of space available in the circular
1071  * buffer.
1072  */
1073
1074 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1075 {
1076         if (pb != NULL)
1077                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1078         else
1079                 return 0;
1080 }
1081
1082
1083 /*
1084  * pl2303_buf_put
1085  *
1086  * Copy data data from a user buffer and put it into the circular buffer.
1087  * Restrict to the amount of space available.
1088  *
1089  * Return the number of bytes copied.
1090  */
1091
1092 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1093         unsigned int count)
1094 {
1095
1096         unsigned int len;
1097
1098
1099         if (pb == NULL)
1100                 return 0;
1101
1102         len  = pl2303_buf_space_avail(pb);
1103         if (count > len)
1104                 count = len;
1105
1106         if (count == 0)
1107                 return 0;
1108
1109         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1110         if (count > len) {
1111                 memcpy(pb->buf_put, buf, len);
1112                 memcpy(pb->buf_buf, buf+len, count - len);
1113                 pb->buf_put = pb->buf_buf + count - len;
1114         } else {
1115                 memcpy(pb->buf_put, buf, count);
1116                 if (count < len)
1117                         pb->buf_put += count;
1118                 else /* count == len */
1119                         pb->buf_put = pb->buf_buf;
1120         }
1121
1122         return count;
1123
1124 }
1125
1126
1127 /*
1128  * pl2303_buf_get
1129  *
1130  * Get data from the circular buffer and copy to the given buffer.
1131  * Restrict to the amount of data available.
1132  *
1133  * Return the number of bytes copied.
1134  */
1135
1136 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1137         unsigned int count)
1138 {
1139
1140         unsigned int len;
1141
1142
1143         if (pb == NULL)
1144                 return 0;
1145
1146         len = pl2303_buf_data_avail(pb);
1147         if (count > len)
1148                 count = len;
1149
1150         if (count == 0)
1151                 return 0;
1152
1153         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1154         if (count > len) {
1155                 memcpy(buf, pb->buf_get, len);
1156                 memcpy(buf+len, pb->buf_buf, count - len);
1157                 pb->buf_get = pb->buf_buf + count - len;
1158         } else {
1159                 memcpy(buf, pb->buf_get, count);
1160                 if (count < len)
1161                         pb->buf_get += count;
1162                 else /* count == len */
1163                         pb->buf_get = pb->buf_buf;
1164         }
1165
1166         return count;
1167
1168 }
1169
1170 static int __init pl2303_init (void)
1171 {
1172         int retval;
1173         retval = usb_serial_register(&pl2303_device);
1174         if (retval)
1175                 goto failed_usb_serial_register;
1176         retval = usb_register(&pl2303_driver);
1177         if (retval)
1178                 goto failed_usb_register;
1179         info(DRIVER_DESC);
1180         return 0;
1181 failed_usb_register:
1182         usb_serial_deregister(&pl2303_device);
1183 failed_usb_serial_register:
1184         return retval;
1185 }
1186
1187
1188 static void __exit pl2303_exit (void)
1189 {
1190         usb_deregister (&pl2303_driver);
1191         usb_serial_deregister (&pl2303_device);
1192 }
1193
1194
1195 module_init(pl2303_init);
1196 module_exit(pl2303_exit);
1197
1198 MODULE_DESCRIPTION(DRIVER_DESC);
1199 MODULE_LICENSE("GPL");
1200
1201 module_param(debug, bool, S_IRUGO | S_IWUSR);
1202 MODULE_PARM_DESC(debug, "Debug enabled or not");
1203