SAFE public projects git trees. - safe/jmp/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_VERSION "v0.12"
  38 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  39
  40 static int debug;
  41
  42 #define PL2303_CLOSING_WAIT     (30*HZ)
  43
  44 #define PL2303_BUF_SIZE         1024
  45 #define PL2303_TMP_BUF_SIZE     1024
  46
  47 static DECLARE_MUTEX(pl2303_tmp_buf_sem);
  48
  49 struct pl2303_buf {
  50         unsigned int    buf_size;
  51         char            *buf_buf;
  52         char            *buf_get;
  53         char            *buf_put;
  54 };
  55
  56 static struct usb_device_id id_table [] = {
  57         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  58         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  59         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  60         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  61         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  62         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  63         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  64         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  65         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  66         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  67         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  68         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  69         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  70         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  71         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  72         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  73         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  74         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  75         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  76         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  77         { USB_DEVICE( NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID ) },
  78         { }                                     /* Terminating entry */
  79 };
  80
  81 MODULE_DEVICE_TABLE (usb, id_table);
  82
  83 static struct usb_driver pl2303_driver = {
  84         .owner =        THIS_MODULE,
  85         .name =         "pl2303",
  86         .probe =        usb_serial_probe,
  87         .disconnect =   usb_serial_disconnect,
  88         .id_table =     id_table,
  89 };
  90
  91 #define SET_LINE_REQUEST_TYPE           0x21
  92 #define SET_LINE_REQUEST                0x20
  93
  94 #define SET_CONTROL_REQUEST_TYPE        0x21
  95 #define SET_CONTROL_REQUEST             0x22
  96 #define CONTROL_DTR                     0x01
  97 #define CONTROL_RTS                     0x02
  98
  99 #define BREAK_REQUEST_TYPE              0x21
 100 #define BREAK_REQUEST                   0x23
 101 #define BREAK_ON                        0xffff
 102 #define BREAK_OFF                       0x0000
 103
 104 #define GET_LINE_REQUEST_TYPE           0xa1
 105 #define GET_LINE_REQUEST                0x21
 106
 107 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 108 #define VENDOR_WRITE_REQUEST            0x01
 109
 110 #define VENDOR_READ_REQUEST_TYPE        0xc0
 111 #define VENDOR_READ_REQUEST             0x01
 112
 113 #define UART_STATE                      0x08
 114 #define UART_STATE_TRANSIENT_MASK       0x74
 115 #define UART_DCD                        0x01
 116 #define UART_DSR                        0x02
 117 #define UART_BREAK_ERROR                0x04
 118 #define UART_RING                       0x08
 119 #define UART_FRAME_ERROR                0x10
 120 #define UART_PARITY_ERROR               0x20
 121 #define UART_OVERRUN_ERROR              0x40
 122 #define UART_CTS                        0x80
 123
 124 /* function prototypes for a PL2303 serial converter */
 125 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 126 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 127 static void pl2303_set_termios (struct usb_serial_port *port,
 128                                 struct termios *old);
 129 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 130                          unsigned int cmd, unsigned long arg);
 131 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 132 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 133 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 134 static int pl2303_write (struct usb_serial_port *port,
 135                          const unsigned char *buf, int count);
 136 static void pl2303_send (struct usb_serial_port *port);
 137 static int pl2303_write_room(struct usb_serial_port *port);
 138 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 139 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 140 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 141 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 142                             unsigned int set, unsigned int clear);
 143 static int pl2303_startup (struct usb_serial *serial);
 144 static void pl2303_shutdown (struct usb_serial *serial);
 145 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 146 static void pl2303_buf_free(struct pl2303_buf *pb);
 147 static void pl2303_buf_clear(struct pl2303_buf *pb);
 148 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 149 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 150 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 151         unsigned int count);
 152 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 153         unsigned int count);
 154
 155
 156 /* All of the device info needed for the PL2303 SIO serial converter */
 157 static struct usb_serial_driver pl2303_device = {
 158         .driver = {
 159                 .owner =        THIS_MODULE,
 160                 .name =         "pl2303",
 161         },
 162         .id_table =             id_table,
 163         .num_interrupt_in =     NUM_DONT_CARE,
 164         .num_bulk_in =          1,
 165         .num_bulk_out =         1,
 166         .num_ports =            1,
 167         .open =                 pl2303_open,
 168         .close =                pl2303_close,
 169         .write =                pl2303_write,
 170         .ioctl =                pl2303_ioctl,
 171         .break_ctl =            pl2303_break_ctl,
 172         .set_termios =          pl2303_set_termios,
 173         .tiocmget =             pl2303_tiocmget,
 174         .tiocmset =             pl2303_tiocmset,
 175         .read_bulk_callback =   pl2303_read_bulk_callback,
 176         .read_int_callback =    pl2303_read_int_callback,
 177         .write_bulk_callback =  pl2303_write_bulk_callback,
 178         .write_room =           pl2303_write_room,
 179         .chars_in_buffer =      pl2303_chars_in_buffer,
 180         .attach =               pl2303_startup,
 181         .shutdown =             pl2303_shutdown,
 182 };
 183
 184 enum pl2303_type {
 185         type_0,         /* don't know the difference between type 0 and */
 186         type_1,         /* type 1, until someone from prolific tells us... */
 187         HX,             /* HX version of the pl2303 chip */
 188 };
 189
 190 struct pl2303_private {
 191         spinlock_t lock;
 192         struct pl2303_buf *buf;
 193         int write_urb_in_use;
 194         wait_queue_head_t delta_msr_wait;
 195         u8 line_control;
 196         u8 line_status;
 197         u8 termios_initialized;
 198         enum pl2303_type type;
 199 };
 200
 201
 202 static int pl2303_startup (struct usb_serial *serial)
 203 {
 204         struct pl2303_private *priv;
 205         enum pl2303_type type = type_0;
 206         int i;
 207
 208         if (serial->dev->descriptor.bDeviceClass == 0x02)
 209                 type = type_0;
 210         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 211                 type = HX;
 212         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 213                 type = type_1;
 214         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 215                 type = type_1;
 216         dbg("device type: %d", type);
 217
 218         for (i = 0; i < serial->num_ports; ++i) {
 219                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 220                 if (!priv)
 221                         goto cleanup;
 222                 memset (priv, 0x00, sizeof (struct pl2303_private));
 223                 spin_lock_init(&priv->lock);
 224                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 225                 if (priv->buf == NULL) {
 226                         kfree(priv);
 227                         goto cleanup;
 228                 }
 229                 init_waitqueue_head(&priv->delta_msr_wait);
 230                 priv->type = type;
 231                 usb_set_serial_port_data(serial->port[i], priv);
 232         }
 233         return 0;
 234
 235 cleanup:
 236         for (--i; i>=0; --i) {
 237                 priv = usb_get_serial_port_data(serial->port[i]);
 238                 pl2303_buf_free(priv->buf);
 239                 kfree(priv);
 240                 usb_set_serial_port_data(serial->port[i], NULL);
 241         }
 242         return -ENOMEM;
 243 }
 244
 245 static int set_control_lines (struct usb_device *dev, u8 value)
 246 {
 247         int retval;
 248
 249         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 250                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 251                                   value, 0, NULL, 0, 100);
 252         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 253         return retval;
 254 }
 255
 256 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 257 {
 258         struct pl2303_private *priv = usb_get_serial_port_data(port);
 259         unsigned long flags;
 260
 261         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 262
 263         if (!count)
 264                 return count;
 265
 266         spin_lock_irqsave(&priv->lock, flags);
 267         count = pl2303_buf_put(priv->buf, buf, count);
 268         spin_unlock_irqrestore(&priv->lock, flags);
 269
 270         pl2303_send(port);
 271
 272         return count;
 273 }
 274
 275 static void pl2303_send(struct usb_serial_port *port)
 276 {
 277         int count, result;
 278         struct pl2303_private *priv = usb_get_serial_port_data(port);
 279         unsigned long flags;
 280
 281         dbg("%s - port %d", __FUNCTION__, port->number);
 282
 283         spin_lock_irqsave(&priv->lock, flags);
 284
 285         if (priv->write_urb_in_use) {
 286                 spin_unlock_irqrestore(&priv->lock, flags);
 287                 return;
 288         }
 289
 290         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 291                 port->bulk_out_size);
 292
 293         if (count == 0) {
 294                 spin_unlock_irqrestore(&priv->lock, flags);
 295                 return;
 296         }
 297
 298         priv->write_urb_in_use = 1;
 299
 300         spin_unlock_irqrestore(&priv->lock, flags);
 301
 302         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 303
 304         port->write_urb->transfer_buffer_length = count;
 305         port->write_urb->dev = port->serial->dev;
 306         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 307         if (result) {
 308                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 309                 priv->write_urb_in_use = 0;
 310                 // TODO: reschedule pl2303_send
 311         }
 312
 313         schedule_work(&port->work);
 314 }
 315
 316 static int pl2303_write_room(struct usb_serial_port *port)
 317 {
 318         struct pl2303_private *priv = usb_get_serial_port_data(port);
 319         int room = 0;
 320         unsigned long flags;
 321
 322         dbg("%s - port %d", __FUNCTION__, port->number);
 323
 324         spin_lock_irqsave(&priv->lock, flags);
 325         room = pl2303_buf_space_avail(priv->buf);
 326         spin_unlock_irqrestore(&priv->lock, flags);
 327
 328         dbg("%s - returns %d", __FUNCTION__, room);
 329         return room;
 330 }
 331
 332 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 333 {
 334         struct pl2303_private *priv = usb_get_serial_port_data(port);
 335         int chars = 0;
 336         unsigned long flags;
 337
 338         dbg("%s - port %d", __FUNCTION__, port->number);
 339
 340         spin_lock_irqsave(&priv->lock, flags);
 341         chars = pl2303_buf_data_avail(priv->buf);
 342         spin_unlock_irqrestore(&priv->lock, flags);
 343
 344         dbg("%s - returns %d", __FUNCTION__, chars);
 345         return chars;
 346 }
 347
 348 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 349 {
 350         struct usb_serial *serial = port->serial;
 351         struct pl2303_private *priv = usb_get_serial_port_data(port);
 352         unsigned long flags;
 353         unsigned int cflag;
 354         unsigned char *buf;
 355         int baud;
 356         int i;
 357         u8 control;
 358
 359         dbg("%s -  port %d", __FUNCTION__, port->number);
 360
 361         if ((!port->tty) || (!port->tty->termios)) {
 362                 dbg("%s - no tty structures", __FUNCTION__);
 363                 return;
 364         }
 365
 366         spin_lock_irqsave(&priv->lock, flags);
 367         if (!priv->termios_initialized) {
 368                 *(port->tty->termios) = tty_std_termios;
 369                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 370                 priv->termios_initialized = 1;
 371         }
 372         spin_unlock_irqrestore(&priv->lock, flags);
 373
 374         cflag = port->tty->termios->c_cflag;
 375         /* check that they really want us to change something */
 376         if (old_termios) {
 377                 if ((cflag == old_termios->c_cflag) &&
 378                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 379                     dbg("%s - nothing to change...", __FUNCTION__);
 380                     return;
 381                 }
 382         }
 383
 384         buf = kmalloc (7, GFP_KERNEL);
 385         if (!buf) {
 386                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 387                 return;
 388         }
 389         memset (buf, 0x00, 0x07);
 390
 391         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 392                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 393                              0, 0, buf, 7, 100);
 394         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 395              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 396
 397
 398         if (cflag & CSIZE) {
 399                 switch (cflag & CSIZE) {
 400                         case CS5:       buf[6] = 5;     break;
 401                         case CS6:       buf[6] = 6;     break;
 402                         case CS7:       buf[6] = 7;     break;
 403                         default:
 404                         case CS8:       buf[6] = 8;     break;
 405                 }
 406                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 407         }
 408
 409         baud = 0;
 410         switch (cflag & CBAUD) {
 411                 case B0:        baud = 0;       break;
 412                 case B75:       baud = 75;      break;
 413                 case B150:      baud = 150;     break;
 414                 case B300:      baud = 300;     break;
 415                 case B600:      baud = 600;     break;
 416                 case B1200:     baud = 1200;    break;
 417                 case B1800:     baud = 1800;    break;
 418                 case B2400:     baud = 2400;    break;
 419                 case B4800:     baud = 4800;    break;
 420                 case B9600:     baud = 9600;    break;
 421                 case B19200:    baud = 19200;   break;
 422                 case B38400:    baud = 38400;   break;
 423                 case B57600:    baud = 57600;   break;
 424                 case B115200:   baud = 115200;  break;
 425                 case B230400:   baud = 230400;  break;
 426                 case B460800:   baud = 460800;  break;
 427                 default:
 428                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 429                         break;
 430         }
 431         dbg("%s - baud = %d", __FUNCTION__, baud);
 432         if (baud) {
 433                 buf[0] = baud & 0xff;
 434                 buf[1] = (baud >> 8) & 0xff;
 435                 buf[2] = (baud >> 16) & 0xff;
 436                 buf[3] = (baud >> 24) & 0xff;
 437         }
 438
 439         /* For reference buf[4]=0 is 1 stop bits */
 440         /* For reference buf[4]=1 is 1.5 stop bits */
 441         /* For reference buf[4]=2 is 2 stop bits */
 442         if (cflag & CSTOPB) {
 443                 buf[4] = 2;
 444                 dbg("%s - stop bits = 2", __FUNCTION__);
 445         } else {
 446                 buf[4] = 0;
 447                 dbg("%s - stop bits = 1", __FUNCTION__);
 448         }
 449
 450         if (cflag & PARENB) {
 451                 /* For reference buf[5]=0 is none parity */
 452                 /* For reference buf[5]=1 is odd parity */
 453                 /* For reference buf[5]=2 is even parity */
 454                 /* For reference buf[5]=3 is mark parity */
 455                 /* For reference buf[5]=4 is space parity */
 456                 if (cflag & PARODD) {
 457                         buf[5] = 1;
 458                         dbg("%s - parity = odd", __FUNCTION__);
 459                 } else {
 460                         buf[5] = 2;
 461                         dbg("%s - parity = even", __FUNCTION__);
 462                 }
 463         } else {
 464                 buf[5] = 0;
 465                 dbg("%s - parity = none", __FUNCTION__);
 466         }
 467
 468         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 469                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 470                              0, 0, buf, 7, 100);
 471         dbg ("0x21:0x20:0:0  %d", i);
 472
 473         /* change control lines if we are switching to or from B0 */
 474         spin_lock_irqsave(&priv->lock, flags);
 475         control = priv->line_control;
 476         if ((cflag & CBAUD) == B0)
 477                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 478         else
 479                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 480         if (control != priv->line_control) {
 481                 control = priv->line_control;
 482                 spin_unlock_irqrestore(&priv->lock, flags);
 483                 set_control_lines(serial->dev, control);
 484         } else {
 485                 spin_unlock_irqrestore(&priv->lock, flags);
 486         }
 487
 488         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 489
 490         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 491                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 492                              0, 0, buf, 7, 100);
 493         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 494              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 495
 496         if (cflag & CRTSCTS) {
 497                 __u16 index;
 498                 if (priv->type == HX)
 499                         index = 0x61;
 500                 else
 501                         index = 0x41;
 502                 i = usb_control_msg(serial->dev,
 503                                     usb_sndctrlpipe(serial->dev, 0),
 504                                     VENDOR_WRITE_REQUEST,
 505                                     VENDOR_WRITE_REQUEST_TYPE,
 506                                     0x0, index, NULL, 0, 100);
 507                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 508         }
 509
 510         kfree (buf);
 511 }
 512
 513 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 514 {
 515         struct termios tmp_termios;
 516         struct usb_serial *serial = port->serial;
 517         struct pl2303_private *priv = usb_get_serial_port_data(port);
 518         unsigned char *buf;
 519         int result;
 520
 521         dbg("%s -  port %d", __FUNCTION__, port->number);
 522
 523         if (priv->type != HX) {
 524                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 525                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 526         }
 527
 528         buf = kmalloc(10, GFP_KERNEL);
 529         if (buf==NULL)
 530                 return -ENOMEM;
 531
 532 #define FISH(a,b,c,d)                                                           \
 533         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 534                                b, a, c, d, buf, 1, 100);                        \
 535         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 536
 537 #define SOUP(a,b,c,d)                                                           \
 538         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 539                                b, a, c, d, NULL, 0, 100);                       \
 540         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 541
 542         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 543         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 544         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 545         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 546         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 547         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 548         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 549         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 550         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 551         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 552
 553         if (priv->type == HX) {
 554                 /* HX chip */
 555                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 556                 /* reset upstream data pipes */
 557                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 558                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 559         } else {
 560                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 561         }
 562
 563         kfree(buf);
 564
 565         /* Setup termios */
 566         if (port->tty) {
 567                 pl2303_set_termios (port, &tmp_termios);
 568         }
 569
 570         //FIXME: need to assert RTS and DTR if CRTSCTS off
 571
 572         dbg("%s - submitting read urb", __FUNCTION__);
 573         port->read_urb->dev = serial->dev;
 574         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 575         if (result) {
 576                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 577                 pl2303_close (port, NULL);
 578                 return -EPROTO;
 579         }
 580
 581         dbg("%s - submitting interrupt urb", __FUNCTION__);
 582         port->interrupt_in_urb->dev = serial->dev;
 583         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 584         if (result) {
 585                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 586                 pl2303_close (port, NULL);
 587                 return -EPROTO;
 588         }
 589         return 0;
 590 }
 591
 592
 593 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 594 {
 595         struct pl2303_private *priv = usb_get_serial_port_data(port);
 596         unsigned long flags;
 597         unsigned int c_cflag;
 598         int bps;
 599         long timeout;
 600         wait_queue_t wait;                                              \
 601
 602         dbg("%s - port %d", __FUNCTION__, port->number);
 603
 604         /* wait for data to drain from the buffer */
 605         spin_lock_irqsave(&priv->lock, flags);
 606         timeout = PL2303_CLOSING_WAIT;
 607         init_waitqueue_entry(&wait, current);
 608         add_wait_queue(&port->tty->write_wait, &wait);
 609         for (;;) {
 610                 set_current_state(TASK_INTERRUPTIBLE);
 611                 if (pl2303_buf_data_avail(priv->buf) == 0
 612                 || timeout == 0 || signal_pending(current)
 613                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 614                         break;
 615                 spin_unlock_irqrestore(&priv->lock, flags);
 616                 timeout = schedule_timeout(timeout);
 617                 spin_lock_irqsave(&priv->lock, flags);
 618         }
 619         set_current_state(TASK_RUNNING);
 620         remove_wait_queue(&port->tty->write_wait, &wait);
 621         /* clear out any remaining data in the buffer */
 622         pl2303_buf_clear(priv->buf);
 623         spin_unlock_irqrestore(&priv->lock, flags);
 624
 625         /* wait for characters to drain from the device */
 626         /* (this is long enough for the entire 256 byte */
 627         /* pl2303 hardware buffer to drain with no flow */
 628         /* control for data rates of 1200 bps or more, */
 629         /* for lower rates we should really know how much */
 630         /* data is in the buffer to compute a delay */
 631         /* that is not unnecessarily long) */
 632         bps = tty_get_baud_rate(port->tty);
 633         if (bps > 1200)
 634                 timeout = max((HZ*2560)/bps,HZ/10);
 635         else
 636                 timeout = 2*HZ;
 637         schedule_timeout_interruptible(timeout);
 638
 639         /* shutdown our urbs */
 640         dbg("%s - shutting down urbs", __FUNCTION__);
 641         usb_kill_urb(port->write_urb);
 642         usb_kill_urb(port->read_urb);
 643         usb_kill_urb(port->interrupt_in_urb);
 644
 645         if (port->tty) {
 646                 c_cflag = port->tty->termios->c_cflag;
 647                 if (c_cflag & HUPCL) {
 648                         /* drop DTR and RTS */
 649                         spin_lock_irqsave(&priv->lock, flags);
 650                         priv->line_control = 0;
 651                         spin_unlock_irqrestore (&priv->lock, flags);
 652                         set_control_lines (port->serial->dev, 0);
 653                 }
 654         }
 655 }
 656
 657 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 658                             unsigned int set, unsigned int clear)
 659 {
 660         struct pl2303_private *priv = usb_get_serial_port_data(port);
 661         unsigned long flags;
 662         u8 control;
 663
 664         if (!usb_get_intfdata(port->serial->interface))
 665                 return -ENODEV;
 666
 667         spin_lock_irqsave (&priv->lock, flags);
 668         if (set & TIOCM_RTS)
 669                 priv->line_control |= CONTROL_RTS;
 670         if (set & TIOCM_DTR)
 671                 priv->line_control |= CONTROL_DTR;
 672         if (clear & TIOCM_RTS)
 673                 priv->line_control &= ~CONTROL_RTS;
 674         if (clear & TIOCM_DTR)
 675                 priv->line_control &= ~CONTROL_DTR;
 676         control = priv->line_control;
 677         spin_unlock_irqrestore (&priv->lock, flags);
 678
 679         return set_control_lines (port->serial->dev, control);
 680 }
 681
 682 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 683 {
 684         struct pl2303_private *priv = usb_get_serial_port_data(port);
 685         unsigned long flags;
 686         unsigned int mcr;
 687         unsigned int status;
 688         unsigned int result;
 689
 690         dbg("%s (%d)", __FUNCTION__, port->number);
 691
 692         if (!usb_get_intfdata(port->serial->interface))
 693                 return -ENODEV;
 694
 695         spin_lock_irqsave (&priv->lock, flags);
 696         mcr = priv->line_control;
 697         status = priv->line_status;
 698         spin_unlock_irqrestore (&priv->lock, flags);
 699
 700         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 701                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 702                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 703                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 704                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 705                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 706
 707         dbg("%s - result = %x", __FUNCTION__, result);
 708
 709         return result;
 710 }
 711
 712 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 713 {
 714         struct pl2303_private *priv = usb_get_serial_port_data(port);
 715         unsigned long flags;
 716         unsigned int prevstatus;
 717         unsigned int status;
 718         unsigned int changed;
 719
 720         spin_lock_irqsave (&priv->lock, flags);
 721         prevstatus = priv->line_status;
 722         spin_unlock_irqrestore (&priv->lock, flags);
 723
 724         while (1) {
 725                 interruptible_sleep_on(&priv->delta_msr_wait);
 726                 /* see if a signal did it */
 727                 if (signal_pending(current))
 728                         return -ERESTARTSYS;
 729
 730                 spin_lock_irqsave (&priv->lock, flags);
 731                 status = priv->line_status;
 732                 spin_unlock_irqrestore (&priv->lock, flags);
 733
 734                 changed=prevstatus^status;
 735
 736                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 737                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 738                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 739                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 740                         return 0;
 741                 }
 742                 prevstatus = status;
 743         }
 744         /* NOTREACHED */
 745         return 0;
 746 }
 747
 748 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 749 {
 750         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 751
 752         switch (cmd) {
 753                 case TIOCMIWAIT:
 754                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 755                         return wait_modem_info(port, arg);
 756
 757                 default:
 758                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 759                         break;
 760         }
 761
 762         return -ENOIOCTLCMD;
 763 }
 764
 765 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 766 {
 767         struct usb_serial *serial = port->serial;
 768         u16 state;
 769         int result;
 770
 771         dbg("%s - port %d", __FUNCTION__, port->number);
 772
 773         if (break_state == 0)
 774                 state = BREAK_OFF;
 775         else
 776                 state = BREAK_ON;
 777         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 778
 779         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 780                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 781                                   0, NULL, 0, 100);
 782         if (result)
 783                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 784 }
 785
 786
 787 static void pl2303_shutdown (struct usb_serial *serial)
 788 {
 789         int i;
 790         struct pl2303_private *priv;
 791
 792         dbg("%s", __FUNCTION__);
 793
 794         for (i = 0; i < serial->num_ports; ++i) {
 795                 priv = usb_get_serial_port_data(serial->port[i]);
 796                 if (priv) {
 797                         pl2303_buf_free(priv->buf);
 798                         kfree(priv);
 799                         usb_set_serial_port_data(serial->port[i], NULL);
 800                 }
 801         }
 802 }
 803
 804 static void pl2303_update_line_status(struct usb_serial_port *port,
 805                                       unsigned char *data,
 806                                       unsigned int actual_length)
 807 {
 808
 809         struct pl2303_private *priv = usb_get_serial_port_data(port);
 810         unsigned long flags;
 811         u8 status_idx = UART_STATE;
 812         u8 length = UART_STATE;
 813
 814         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 815             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65)) {
 816                 length = 1;
 817                 status_idx = 0;
 818         }
 819
 820         if (actual_length < length)
 821                 goto exit;
 822
 823         /* Save off the uart status for others to look at */
 824         spin_lock_irqsave(&priv->lock, flags);
 825         priv->line_status = data[status_idx];
 826         spin_unlock_irqrestore(&priv->lock, flags);
 827
 828 exit:
 829         return;
 830 }
 831
 832 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 833 {
 834         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 835         unsigned char *data = urb->transfer_buffer;
 836         unsigned int actual_length = urb->actual_length;
 837         int status;
 838
 839         dbg("%s (%d)", __FUNCTION__, port->number);
 840
 841         switch (urb->status) {
 842         case 0:
 843                 /* success */
 844                 break;
 845         case -ECONNRESET:
 846         case -ENOENT:
 847         case -ESHUTDOWN:
 848                 /* this urb is terminated, clean up */
 849                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 850                 return;
 851         default:
 852                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 853                 goto exit;
 854         }
 855
 856         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 857         pl2303_update_line_status(port, data, actual_length);
 858
 859 exit:
 860         status = usb_submit_urb (urb, GFP_ATOMIC);
 861         if (status)
 862                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 863                         __FUNCTION__, status);
 864 }
 865
 866
 867 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 868 {
 869         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 870         struct pl2303_private *priv = usb_get_serial_port_data(port);
 871         struct tty_struct *tty;
 872         unsigned char *data = urb->transfer_buffer;
 873         unsigned long flags;
 874         int i;
 875         int result;
 876         u8 status;
 877         char tty_flag;
 878
 879         dbg("%s - port %d", __FUNCTION__, port->number);
 880
 881         if (urb->status) {
 882                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 883                 if (!port->open_count) {
 884                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 885                         return;
 886                 }
 887                 if (urb->status == -EPROTO) {
 888                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 889                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 890                         urb->status = 0;
 891                         urb->dev = port->serial->dev;
 892                         result = usb_submit_urb(urb, GFP_ATOMIC);
 893                         if (result)
 894                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 895                         return;
 896                 }
 897                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 898                 return;
 899         }
 900
 901         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 902
 903         /* get tty_flag from status */
 904         tty_flag = TTY_NORMAL;
 905
 906         spin_lock_irqsave(&priv->lock, flags);
 907         status = priv->line_status;
 908         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 909         spin_unlock_irqrestore(&priv->lock, flags);
 910         wake_up_interruptible (&priv->delta_msr_wait);
 911
 912         /* break takes precedence over parity, */
 913         /* which takes precedence over framing errors */
 914         if (status & UART_BREAK_ERROR )
 915                 tty_flag = TTY_BREAK;
 916         else if (status & UART_PARITY_ERROR)
 917                 tty_flag = TTY_PARITY;
 918         else if (status & UART_FRAME_ERROR)
 919                 tty_flag = TTY_FRAME;
 920         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 921
 922         tty = port->tty;
 923         if (tty && urb->actual_length) {
 924                 /* overrun is special, not associated with a char */
 925                 if (status & UART_OVERRUN_ERROR)
 926                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 927
 928                 for (i = 0; i < urb->actual_length; ++i) {
 929                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 930                                 tty_flip_buffer_push(tty);
 931                         }
 932                         tty_insert_flip_char (tty, data[i], tty_flag);
 933                 }
 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 " " DRIVER_VERSION);
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_VERSION(DRIVER_VERSION);
1200 MODULE_LICENSE("GPL");
1201
1202 module_param(debug, bool, S_IRUGO | S_IWUSR);
1203 MODULE_PARM_DESC(debug, "Debug enabled or not");
1204