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