drivers/usb/serial/oti6858.c

   1 /*
   2  * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
   3  *
   4  * Copyleft  (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
   5  * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
   6  * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
   7  * Copyright (C) 2003 IBM Corp.
   8  *
   9  * Many thanks to the authors of pl2303 driver: all functions in this file
  10  * are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
  11  *
  12  * Warning! You use this driver on your own risk! The only official
  13  * description of this device I have is datasheet from manufacturer,
  14  * and it doesn't contain almost any information needed to write a driver.
  15  * Almost all knowlegde used while writing this driver was gathered by:
  16  *  - analyzing traffic between device and the M$ Windows 2000 driver,
  17  *  - trying different bit combinations and checking pin states
  18  *    with a voltmeter,
  19  *  - receiving malformed frames and producing buffer overflows
  20  *    to learn how errors are reported,
  21  * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
  22  * CONNECTED TO IT!
  23  *
  24  * This program is free software; you can redistribute it and/or modify
  25  * it under the terms of the GNU General Public License as published by
  26  * the Free Software Foundation; either version 2 of the License.
  27  *
  28  * See Documentation/usb/usb-serial.txt for more information on using this
  29  * driver
  30  *
  31  * TODO:
  32  *  - implement correct flushing for ioctls and oti6858_close()
  33  *  - check how errors (rx overflow, parity error, framing error) are reported
  34  *  - implement oti6858_break_ctl()
  35  *  - implement more ioctls
  36  *  - test/implement flow control
  37  *  - allow setting custom baud rates
  38  */
  39
  40 #include <linux/kernel.h>
  41 #include <linux/errno.h>
  42 #include <linux/init.h>
  43 #include <linux/slab.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_driver.h>
  46 #include <linux/tty_flip.h>
  47 #include <linux/serial.h>
  48 #include <linux/module.h>
  49 #include <linux/moduleparam.h>
  50 #include <linux/spinlock.h>
  51 #include <linux/usb.h>
  52 #include <linux/usb/serial.h>
  53 #include <linux/uaccess.h>
  54 #include "oti6858.h"
  55
  56 #define OTI6858_DESCRIPTION \
  57         "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
  58 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
  59 #define OTI6858_VERSION "0.1"
  60
  61 static struct usb_device_id id_table [] = {
  62         { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
  63         { }
  64 };
  65
  66 MODULE_DEVICE_TABLE(usb, id_table);
  67
  68 static struct usb_driver oti6858_driver = {
  69         .name =         "oti6858",
  70         .probe =        usb_serial_probe,
  71         .disconnect =   usb_serial_disconnect,
  72         .id_table =     id_table,
  73         .no_dynamic_id =        1,
  74 };
  75
  76 static int debug;
  77
  78
  79 /* buffering code, copied from pl2303 driver */
  80 #define PL2303_BUF_SIZE         1024
  81 #define PL2303_TMP_BUF_SIZE     1024
  82
  83 struct oti6858_buf {
  84         unsigned int    buf_size;
  85         char            *buf_buf;
  86         char            *buf_get;
  87         char            *buf_put;
  88 };
  89
  90 /* requests */
  91 #define OTI6858_REQ_GET_STATUS          (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
  92 #define OTI6858_REQ_T_GET_STATUS        0x01
  93
  94 #define OTI6858_REQ_SET_LINE            (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
  95 #define OTI6858_REQ_T_SET_LINE          0x00
  96
  97 #define OTI6858_REQ_CHECK_TXBUFF        (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
  98 #define OTI6858_REQ_T_CHECK_TXBUFF      0x00
  99
 100 /* format of the control packet */
 101 struct oti6858_control_pkt {
 102         __le16  divisor;        /* baud rate = 96000000 / (16 * divisor), LE */
 103 #define OTI6858_MAX_BAUD_RATE   3000000
 104         u8      frame_fmt;
 105 #define FMT_STOP_BITS_MASK      0xc0
 106 #define FMT_STOP_BITS_1         0x00
 107 #define FMT_STOP_BITS_2         0x40    /* 1.5 stop bits if FMT_DATA_BITS_5 */
 108 #define FMT_PARITY_MASK         0x38
 109 #define FMT_PARITY_NONE         0x00
 110 #define FMT_PARITY_ODD          0x08
 111 #define FMT_PARITY_EVEN         0x18
 112 #define FMT_PARITY_MARK         0x28
 113 #define FMT_PARITY_SPACE        0x38
 114 #define FMT_DATA_BITS_MASK      0x03
 115 #define FMT_DATA_BITS_5         0x00
 116 #define FMT_DATA_BITS_6         0x01
 117 #define FMT_DATA_BITS_7         0x02
 118 #define FMT_DATA_BITS_8         0x03
 119         u8      something;      /* always equals 0x43 */
 120         u8      control;        /* settings of flow control lines */
 121 #define CONTROL_MASK            0x0c
 122 #define CONTROL_DTR_HIGH        0x08
 123 #define CONTROL_RTS_HIGH        0x04
 124         u8      tx_status;
 125 #define TX_BUFFER_EMPTIED       0x09
 126         u8      pin_state;
 127 #define PIN_MASK                0x3f
 128 #define PIN_RTS                 0x20    /* output pin */
 129 #define PIN_CTS                 0x10    /* input pin, active low */
 130 #define PIN_DSR                 0x08    /* input pin, active low */
 131 #define PIN_DTR                 0x04    /* output pin */
 132 #define PIN_RI                  0x02    /* input pin, active low */
 133 #define PIN_DCD                 0x01    /* input pin, active low */
 134         u8      rx_bytes_avail;         /* number of bytes in rx buffer */;
 135 };
 136
 137 #define OTI6858_CTRL_PKT_SIZE   sizeof(struct oti6858_control_pkt)
 138 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
 139         (((a)->divisor == (priv)->pending_setup.divisor) \
 140           && ((a)->control == (priv)->pending_setup.control) \
 141           && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
 142
 143 /* function prototypes */
 144 static int oti6858_open(struct tty_struct *tty,
 145                         struct usb_serial_port *port, struct file *filp);
 146 static void oti6858_close(struct tty_struct *tty,
 147                         struct usb_serial_port *port, struct file *filp);
 148 static void oti6858_set_termios(struct tty_struct *tty,
 149                         struct usb_serial_port *port, struct ktermios *old);
 150 static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
 151                         unsigned int cmd, unsigned long arg);
 152 static void oti6858_read_int_callback(struct urb *urb);
 153 static void oti6858_read_bulk_callback(struct urb *urb);
 154 static void oti6858_write_bulk_callback(struct urb *urb);
 155 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
 156                         const unsigned char *buf, int count);
 157 static int oti6858_write_room(struct tty_struct *tty);
 158 static int oti6858_chars_in_buffer(struct tty_struct *tty);
 159 static int oti6858_tiocmget(struct tty_struct *tty, struct file *file);
 160 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
 161                                 unsigned int set, unsigned int clear);
 162 static int oti6858_startup(struct usb_serial *serial);
 163 static void oti6858_shutdown(struct usb_serial *serial);
 164
 165 /* functions operating on buffers */
 166 static struct oti6858_buf *oti6858_buf_alloc(unsigned int size);
 167 static void oti6858_buf_free(struct oti6858_buf *pb);
 168 static void oti6858_buf_clear(struct oti6858_buf *pb);
 169 static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb);
 170 static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb);
 171 static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
 172                                         unsigned int count);
 173 static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
 174                                         unsigned int count);
 175
 176
 177 /* device info */
 178 static struct usb_serial_driver oti6858_device = {
 179         .driver = {
 180                 .owner =        THIS_MODULE,
 181                 .name =         "oti6858",
 182         },
 183         .id_table =             id_table,
 184         .num_ports =            1,
 185         .open =                 oti6858_open,
 186         .close =                oti6858_close,
 187         .write =                oti6858_write,
 188         .ioctl =                oti6858_ioctl,
 189         .set_termios =          oti6858_set_termios,
 190         .tiocmget =             oti6858_tiocmget,
 191         .tiocmset =             oti6858_tiocmset,
 192         .read_bulk_callback =   oti6858_read_bulk_callback,
 193         .read_int_callback =    oti6858_read_int_callback,
 194         .write_bulk_callback =  oti6858_write_bulk_callback,
 195         .write_room =           oti6858_write_room,
 196         .chars_in_buffer =      oti6858_chars_in_buffer,
 197         .attach =               oti6858_startup,
 198         .shutdown =             oti6858_shutdown,
 199 };
 200
 201 struct oti6858_private {
 202         spinlock_t lock;
 203
 204         struct oti6858_buf *buf;
 205         struct oti6858_control_pkt status;
 206
 207         struct {
 208                 u8 read_urb_in_use;
 209                 u8 write_urb_in_use;
 210                 u8 termios_initialized;
 211         } flags;
 212         struct delayed_work delayed_write_work;
 213
 214         struct {
 215                 __le16 divisor;
 216                 u8 frame_fmt;
 217                 u8 control;
 218         } pending_setup;
 219         u8 transient;
 220         u8 setup_done;
 221         struct delayed_work delayed_setup_work;
 222
 223         wait_queue_head_t intr_wait;
 224         struct usb_serial_port *port;   /* USB port with which associated */
 225 };
 226
 227 static void setup_line(struct work_struct *work)
 228 {
 229         struct oti6858_private *priv = container_of(work,
 230                         struct oti6858_private, delayed_setup_work.work);
 231         struct usb_serial_port *port = priv->port;
 232         struct oti6858_control_pkt *new_setup;
 233         unsigned long flags;
 234         int result;
 235
 236         dbg("%s(port = %d)", __func__, port->number);
 237
 238         new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
 239         if (new_setup == NULL) {
 240                 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
 241                 /* we will try again */
 242                 schedule_delayed_work(&priv->delayed_setup_work,
 243                                                 msecs_to_jiffies(2));
 244                 return;
 245         }
 246
 247         result = usb_control_msg(port->serial->dev,
 248                                 usb_rcvctrlpipe(port->serial->dev, 0),
 249                                 OTI6858_REQ_T_GET_STATUS,
 250                                 OTI6858_REQ_GET_STATUS,
 251                                 0, 0,
 252                                 new_setup, OTI6858_CTRL_PKT_SIZE,
 253                                 100);
 254
 255         if (result != OTI6858_CTRL_PKT_SIZE) {
 256                 dev_err(&port->dev, "%s(): error reading status\n", __func__);
 257                 kfree(new_setup);
 258                 /* we will try again */
 259                 schedule_delayed_work(&priv->delayed_setup_work,
 260                                                         msecs_to_jiffies(2));
 261                 return;
 262         }
 263
 264         spin_lock_irqsave(&priv->lock, flags);
 265         if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
 266                 new_setup->divisor = priv->pending_setup.divisor;
 267                 new_setup->control = priv->pending_setup.control;
 268                 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
 269
 270                 spin_unlock_irqrestore(&priv->lock, flags);
 271                 result = usb_control_msg(port->serial->dev,
 272                                         usb_sndctrlpipe(port->serial->dev, 0),
 273                                         OTI6858_REQ_T_SET_LINE,
 274                                         OTI6858_REQ_SET_LINE,
 275                                         0, 0,
 276                                         new_setup, OTI6858_CTRL_PKT_SIZE,
 277                                         100);
 278         } else {
 279                 spin_unlock_irqrestore(&priv->lock, flags);
 280                 result = 0;
 281         }
 282         kfree(new_setup);
 283
 284         spin_lock_irqsave(&priv->lock, flags);
 285         if (result != OTI6858_CTRL_PKT_SIZE)
 286                 priv->transient = 0;
 287         priv->setup_done = 1;
 288         spin_unlock_irqrestore(&priv->lock, flags);
 289
 290         dbg("%s(): submitting interrupt urb", __func__);
 291         port->interrupt_in_urb->dev = port->serial->dev;
 292         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 293         if (result != 0) {
 294                 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
 295                                 " with error %d\n", __func__, result);
 296         }
 297 }
 298
 299 void send_data(struct work_struct *work)
 300 {
 301         struct oti6858_private *priv = container_of(work,
 302                         struct oti6858_private, delayed_write_work.work);
 303         struct usb_serial_port *port = priv->port;
 304         int count = 0, result;
 305         unsigned long flags;
 306         unsigned char allow;
 307
 308         dbg("%s(port = %d)", __func__, port->number);
 309
 310         spin_lock_irqsave(&priv->lock, flags);
 311         if (priv->flags.write_urb_in_use) {
 312                 spin_unlock_irqrestore(&priv->lock, flags);
 313                 schedule_delayed_work(&priv->delayed_write_work,
 314                                                 msecs_to_jiffies(2));
 315                 return;
 316         }
 317         priv->flags.write_urb_in_use = 1;
 318
 319         count = oti6858_buf_data_avail(priv->buf);
 320         spin_unlock_irqrestore(&priv->lock, flags);
 321         if (count > port->bulk_out_size)
 322                 count = port->bulk_out_size;
 323
 324         if (count != 0) {
 325                 result = usb_control_msg(port->serial->dev,
 326                                 usb_rcvctrlpipe(port->serial->dev, 0),
 327                                 OTI6858_REQ_T_CHECK_TXBUFF,
 328                                 OTI6858_REQ_CHECK_TXBUFF,
 329                                 count, 0, &allow, 1, 100);
 330                 if (result != 1 || allow != 0)
 331                         count = 0;
 332         }
 333
 334         if (count == 0) {
 335                 priv->flags.write_urb_in_use = 0;
 336
 337                 dbg("%s(): submitting interrupt urb", __func__);
 338                 port->interrupt_in_urb->dev = port->serial->dev;
 339                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 340                 if (result != 0) {
 341                         dev_err(&port->dev, "%s(): usb_submit_urb() failed"
 342                                 " with error %d\n", __func__, result);
 343                 }
 344                 return;
 345         }
 346
 347         spin_lock_irqsave(&priv->lock, flags);
 348         oti6858_buf_get(priv->buf, port->write_urb->transfer_buffer, count);
 349         spin_unlock_irqrestore(&priv->lock, flags);
 350
 351         port->write_urb->transfer_buffer_length = count;
 352         port->write_urb->dev = port->serial->dev;
 353         result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 354         if (result != 0) {
 355                 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
 356                                " with error %d\n", __func__, result);
 357                 priv->flags.write_urb_in_use = 0;
 358         }
 359
 360         usb_serial_port_softint(port);
 361 }
 362
 363 static int oti6858_startup(struct usb_serial *serial)
 364 {
 365         struct usb_serial_port *port = serial->port[0];
 366         struct oti6858_private *priv;
 367         int i;
 368
 369         for (i = 0; i < serial->num_ports; ++i) {
 370                 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
 371                 if (!priv)
 372                         break;
 373                 priv->buf = oti6858_buf_alloc(PL2303_BUF_SIZE);
 374                 if (priv->buf == NULL) {
 375                         kfree(priv);
 376                         break;
 377                 }
 378
 379                 spin_lock_init(&priv->lock);
 380                 init_waitqueue_head(&priv->intr_wait);
 381 /*              INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
 382 /*              INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
 383                 priv->port = port;
 384                 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
 385                 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
 386
 387                 usb_set_serial_port_data(serial->port[i], priv);
 388         }
 389         if (i == serial->num_ports)
 390                 return 0;
 391
 392         for (--i; i >= 0; --i) {
 393                 priv = usb_get_serial_port_data(serial->port[i]);
 394                 oti6858_buf_free(priv->buf);
 395                 kfree(priv);
 396                 usb_set_serial_port_data(serial->port[i], NULL);
 397         }
 398         return -ENOMEM;
 399 }
 400
 401 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
 402                         const unsigned char *buf, int count)
 403 {
 404         struct oti6858_private *priv = usb_get_serial_port_data(port);
 405         unsigned long flags;
 406
 407         dbg("%s(port = %d, count = %d)", __func__, port->number, count);
 408
 409         if (!count)
 410                 return count;
 411
 412         spin_lock_irqsave(&priv->lock, flags);
 413         count = oti6858_buf_put(priv->buf, buf, count);
 414         spin_unlock_irqrestore(&priv->lock, flags);
 415
 416         return count;
 417 }
 418
 419 static int oti6858_write_room(struct tty_struct *tty)
 420 {
 421         struct usb_serial_port *port = tty->driver_data;
 422         struct oti6858_private *priv = usb_get_serial_port_data(port);
 423         int room = 0;
 424         unsigned long flags;
 425
 426         dbg("%s(port = %d)", __func__, port->number);
 427
 428         spin_lock_irqsave(&priv->lock, flags);
 429         room = oti6858_buf_space_avail(priv->buf);
 430         spin_unlock_irqrestore(&priv->lock, flags);
 431
 432         return room;
 433 }
 434
 435 static int oti6858_chars_in_buffer(struct tty_struct *tty)
 436 {
 437         struct usb_serial_port *port = tty->driver_data;
 438         struct oti6858_private *priv = usb_get_serial_port_data(port);
 439         int chars = 0;
 440         unsigned long flags;
 441
 442         dbg("%s(port = %d)", __func__, port->number);
 443
 444         spin_lock_irqsave(&priv->lock, flags);
 445         chars = oti6858_buf_data_avail(priv->buf);
 446         spin_unlock_irqrestore(&priv->lock, flags);
 447
 448         return chars;
 449 }
 450
 451 static void oti6858_set_termios(struct tty_struct *tty,
 452                 struct usb_serial_port *port, struct ktermios *old_termios)
 453 {
 454         struct oti6858_private *priv = usb_get_serial_port_data(port);
 455         unsigned long flags;
 456         unsigned int cflag;
 457         u8 frame_fmt, control;
 458         __le16 divisor;
 459         int br;
 460
 461         dbg("%s(port = %d)", __func__, port->number);
 462
 463         if (!tty) {
 464                 dbg("%s(): no tty structures", __func__);
 465                 return;
 466         }
 467
 468         spin_lock_irqsave(&priv->lock, flags);
 469         if (!priv->flags.termios_initialized) {
 470                 *(tty->termios) = tty_std_termios;
 471                 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
 472                 tty->termios->c_ispeed = 38400;
 473                 tty->termios->c_ospeed = 38400;
 474                 priv->flags.termios_initialized = 1;
 475         }
 476         spin_unlock_irqrestore(&priv->lock, flags);
 477
 478         cflag = tty->termios->c_cflag;
 479
 480         spin_lock_irqsave(&priv->lock, flags);
 481         divisor = priv->pending_setup.divisor;
 482         frame_fmt = priv->pending_setup.frame_fmt;
 483         control = priv->pending_setup.control;
 484         spin_unlock_irqrestore(&priv->lock, flags);
 485
 486         frame_fmt &= ~FMT_DATA_BITS_MASK;
 487         switch (cflag & CSIZE) {
 488         case CS5:
 489                 frame_fmt |= FMT_DATA_BITS_5;
 490                 break;
 491         case CS6:
 492                 frame_fmt |= FMT_DATA_BITS_6;
 493                 break;
 494         case CS7:
 495                 frame_fmt |= FMT_DATA_BITS_7;
 496                 break;
 497         default:
 498         case CS8:
 499                 frame_fmt |= FMT_DATA_BITS_8;
 500                 break;
 501         }
 502
 503         /* manufacturer claims that this device can work with baud rates
 504          * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
 505          * guarantee that any other baud rate will work (especially
 506          * the higher ones)
 507          */
 508         br = tty_get_baud_rate(tty);
 509         if (br == 0) {
 510                 divisor = 0;
 511         } else {
 512                 int real_br;
 513                 int new_divisor;
 514                 br = min(br, OTI6858_MAX_BAUD_RATE);
 515
 516                 new_divisor = (96000000 + 8 * br) / (16 * br);
 517                 real_br = 96000000 / (16 * new_divisor);
 518                 divisor = cpu_to_le16(new_divisor);
 519                 tty_encode_baud_rate(tty, real_br, real_br);
 520         }
 521
 522         frame_fmt &= ~FMT_STOP_BITS_MASK;
 523         if ((cflag & CSTOPB) != 0)
 524                 frame_fmt |= FMT_STOP_BITS_2;
 525         else
 526                 frame_fmt |= FMT_STOP_BITS_1;
 527
 528         frame_fmt &= ~FMT_PARITY_MASK;
 529         if ((cflag & PARENB) != 0) {
 530                 if ((cflag & PARODD) != 0)
 531                         frame_fmt |= FMT_PARITY_ODD;
 532                 else
 533                         frame_fmt |= FMT_PARITY_EVEN;
 534         } else {
 535                 frame_fmt |= FMT_PARITY_NONE;
 536         }
 537
 538         control &= ~CONTROL_MASK;
 539         if ((cflag & CRTSCTS) != 0)
 540                 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
 541
 542         /* change control lines if we are switching to or from B0 */
 543         /* FIXME:
 544         spin_lock_irqsave(&priv->lock, flags);
 545         control = priv->line_control;
 546         if ((cflag & CBAUD) == B0)
 547                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 548         else
 549                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 550         if (control != priv->line_control) {
 551                 control = priv->line_control;
 552                 spin_unlock_irqrestore(&priv->lock, flags);
 553                 set_control_lines(serial->dev, control);
 554         } else {
 555                 spin_unlock_irqrestore(&priv->lock, flags);
 556         }
 557         */
 558
 559         spin_lock_irqsave(&priv->lock, flags);
 560         if (divisor != priv->pending_setup.divisor
 561                         || control != priv->pending_setup.control
 562                         || frame_fmt != priv->pending_setup.frame_fmt) {
 563                 priv->pending_setup.divisor = divisor;
 564                 priv->pending_setup.control = control;
 565                 priv->pending_setup.frame_fmt = frame_fmt;
 566         }
 567         spin_unlock_irqrestore(&priv->lock, flags);
 568 }
 569
 570 static int oti6858_open(struct tty_struct *tty,
 571                         struct usb_serial_port *port, struct file *filp)
 572 {
 573         struct oti6858_private *priv = usb_get_serial_port_data(port);
 574         struct ktermios tmp_termios;
 575         struct usb_serial *serial = port->serial;
 576         struct oti6858_control_pkt *buf;
 577         unsigned long flags;
 578         int result;
 579
 580         dbg("%s(port = %d)", __func__, port->number);
 581
 582         usb_clear_halt(serial->dev, port->write_urb->pipe);
 583         usb_clear_halt(serial->dev, port->read_urb->pipe);
 584
 585         if (port->port.count != 1)
 586                 return 0;
 587
 588         buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
 589         if (buf == NULL) {
 590                 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
 591                 return -ENOMEM;
 592         }
 593
 594         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 595                                 OTI6858_REQ_T_GET_STATUS,
 596                                 OTI6858_REQ_GET_STATUS,
 597                                 0, 0,
 598                                 buf, OTI6858_CTRL_PKT_SIZE,
 599                                 100);
 600         if (result != OTI6858_CTRL_PKT_SIZE) {
 601                 /* assume default (after power-on reset) values */
 602                 buf->divisor = cpu_to_le16(0x009c);     /* 38400 bps */
 603                 buf->frame_fmt = 0x03;  /* 8N1 */
 604                 buf->something = 0x43;
 605                 buf->control = 0x4c;    /* DTR, RTS */
 606                 buf->tx_status = 0x00;
 607                 buf->pin_state = 0x5b;  /* RTS, CTS, DSR, DTR, RI, DCD */
 608                 buf->rx_bytes_avail = 0x00;
 609         }
 610
 611         spin_lock_irqsave(&priv->lock, flags);
 612         memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
 613         priv->pending_setup.divisor = buf->divisor;
 614         priv->pending_setup.frame_fmt = buf->frame_fmt;
 615         priv->pending_setup.control = buf->control;
 616         spin_unlock_irqrestore(&priv->lock, flags);
 617         kfree(buf);
 618
 619         dbg("%s(): submitting interrupt urb", __func__);
 620         port->interrupt_in_urb->dev = serial->dev;
 621         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 622         if (result != 0) {
 623                 dev_err(&port->dev, "%s(): usb_submit_urb() failed"
 624                                " with error %d\n", __func__, result);
 625                 oti6858_close(tty, port, NULL);
 626                 return -EPROTO;
 627         }
 628
 629         /* setup termios */
 630         if (tty)
 631                 oti6858_set_termios(tty, port, &tmp_termios);
 632
 633         return 0;
 634 }
 635
 636 static void oti6858_close(struct tty_struct *tty,
 637                         struct usb_serial_port *port, struct file *filp)
 638 {
 639         struct oti6858_private *priv = usb_get_serial_port_data(port);
 640         unsigned long flags;
 641         long timeout;
 642         wait_queue_t wait;
 643
 644         dbg("%s(port = %d)", __func__, port->number);
 645
 646         /* wait for data to drain from the buffer */
 647         spin_lock_irqsave(&priv->lock, flags);
 648         timeout = 30 * HZ;      /* PL2303_CLOSING_WAIT */
 649         init_waitqueue_entry(&wait, current);
 650         add_wait_queue(&tty->write_wait, &wait);
 651         dbg("%s(): entering wait loop", __func__);
 652         for (;;) {
 653                 set_current_state(TASK_INTERRUPTIBLE);
 654                 if (oti6858_buf_data_avail(priv->buf) == 0
 655                 || timeout == 0 || signal_pending(current)
 656                 || port->serial->disconnected)
 657                         break;
 658                 spin_unlock_irqrestore(&priv->lock, flags);
 659                 timeout = schedule_timeout(timeout);
 660                 spin_lock_irqsave(&priv->lock, flags);
 661         }
 662         set_current_state(TASK_RUNNING);
 663         remove_wait_queue(&tty->write_wait, &wait);
 664         dbg("%s(): after wait loop", __func__);
 665
 666         /* clear out any remaining data in the buffer */
 667         oti6858_buf_clear(priv->buf);
 668         spin_unlock_irqrestore(&priv->lock, flags);
 669
 670         /* wait for characters to drain from the device */
 671         /* (this is long enough for the entire 256 byte */
 672         /* pl2303 hardware buffer to drain with no flow */
 673         /* control for data rates of 1200 bps or more, */
 674         /* for lower rates we should really know how much */
 675         /* data is in the buffer to compute a delay */
 676         /* that is not unnecessarily long) */
 677         /* FIXME
 678         bps = tty_get_baud_rate(tty);
 679         if (bps > 1200)
 680                 timeout = max((HZ*2560)/bps,HZ/10);
 681         else
 682         */
 683                 timeout = 2*HZ;
 684         schedule_timeout_interruptible(timeout);
 685         dbg("%s(): after schedule_timeout_interruptible()", __func__);
 686
 687         /* cancel scheduled setup */
 688         cancel_delayed_work(&priv->delayed_setup_work);
 689         cancel_delayed_work(&priv->delayed_write_work);
 690         flush_scheduled_work();
 691
 692         /* shutdown our urbs */
 693         dbg("%s(): shutting down urbs", __func__);
 694         usb_kill_urb(port->write_urb);
 695         usb_kill_urb(port->read_urb);
 696         usb_kill_urb(port->interrupt_in_urb);
 697
 698         /*
 699         if (tty && (tty->termios->c_cflag) & HUPCL) {
 700                 // drop DTR and RTS
 701                 spin_lock_irqsave(&priv->lock, flags);
 702                 priv->pending_setup.control &= ~CONTROL_MASK;
 703                 spin_unlock_irqrestore(&priv->lock, flags);
 704         }
 705         */
 706 }
 707
 708 static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
 709                                 unsigned int set, unsigned int clear)
 710 {
 711         struct usb_serial_port *port = tty->driver_data;
 712         struct oti6858_private *priv = usb_get_serial_port_data(port);
 713         unsigned long flags;
 714         u8 control;
 715
 716         dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
 717                                 __func__, port->number, set, clear);
 718
 719         if (!usb_get_intfdata(port->serial->interface))
 720                 return -ENODEV;
 721
 722         /* FIXME: check if this is correct (active high/low) */
 723         spin_lock_irqsave(&priv->lock, flags);
 724         control = priv->pending_setup.control;
 725         if ((set & TIOCM_RTS) != 0)
 726                 control |= CONTROL_RTS_HIGH;
 727         if ((set & TIOCM_DTR) != 0)
 728                 control |= CONTROL_DTR_HIGH;
 729         if ((clear & TIOCM_RTS) != 0)
 730                 control &= ~CONTROL_RTS_HIGH;
 731         if ((clear & TIOCM_DTR) != 0)
 732                 control &= ~CONTROL_DTR_HIGH;
 733
 734         if (control != priv->pending_setup.control)
 735                 priv->pending_setup.control = control;
 736
 737         spin_unlock_irqrestore(&priv->lock, flags);
 738         return 0;
 739 }
 740
 741 static int oti6858_tiocmget(struct tty_struct *tty, struct file *file)
 742 {
 743         struct usb_serial_port *port = tty->driver_data;
 744         struct oti6858_private *priv = usb_get_serial_port_data(port);
 745         unsigned long flags;
 746         unsigned pin_state;
 747         unsigned result = 0;
 748
 749         dbg("%s(port = %d)", __func__, port->number);
 750
 751         if (!usb_get_intfdata(port->serial->interface))
 752                 return -ENODEV;
 753
 754         spin_lock_irqsave(&priv->lock, flags);
 755         pin_state = priv->status.pin_state & PIN_MASK;
 756         spin_unlock_irqrestore(&priv->lock, flags);
 757
 758         /* FIXME: check if this is correct (active high/low) */
 759         if ((pin_state & PIN_RTS) != 0)
 760                 result |= TIOCM_RTS;
 761         if ((pin_state & PIN_CTS) != 0)
 762                 result |= TIOCM_CTS;
 763         if ((pin_state & PIN_DSR) != 0)
 764                 result |= TIOCM_DSR;
 765         if ((pin_state & PIN_DTR) != 0)
 766                 result |= TIOCM_DTR;
 767         if ((pin_state & PIN_RI) != 0)
 768                 result |= TIOCM_RI;
 769         if ((pin_state & PIN_DCD) != 0)
 770                 result |= TIOCM_CD;
 771
 772         dbg("%s() = 0x%08x", __func__, result);
 773
 774         return result;
 775 }
 776
 777 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 778 {
 779         struct oti6858_private *priv = usb_get_serial_port_data(port);
 780         unsigned long flags;
 781         unsigned int prev, status;
 782         unsigned int changed;
 783
 784         spin_lock_irqsave(&priv->lock, flags);
 785         prev = priv->status.pin_state;
 786         spin_unlock_irqrestore(&priv->lock, flags);
 787
 788         while (1) {
 789                 wait_event_interruptible(priv->intr_wait,
 790                                         priv->status.pin_state != prev);
 791                 if (signal_pending(current))
 792                         return -ERESTARTSYS;
 793
 794                 spin_lock_irqsave(&priv->lock, flags);
 795                 status = priv->status.pin_state & PIN_MASK;
 796                 spin_unlock_irqrestore(&priv->lock, flags);
 797
 798                 changed = prev ^ status;
 799                 /* FIXME: check if this is correct (active high/low) */
 800                 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
 801                     ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
 802                     ((arg & TIOCM_CD)  && (changed & PIN_DCD)) ||
 803                     ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
 804                         return 0;
 805                 prev = status;
 806         }
 807
 808         /* NOTREACHED */
 809         return 0;
 810 }
 811
 812 static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
 813                         unsigned int cmd, unsigned long arg)
 814 {
 815         struct usb_serial_port *port = tty->driver_data;
 816
 817         dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
 818                                 __func__, port->number, cmd, arg);
 819
 820         switch (cmd) {
 821         case TIOCMIWAIT:
 822                 dbg("%s(): TIOCMIWAIT", __func__);
 823                 return wait_modem_info(port, arg);
 824         default:
 825                 dbg("%s(): 0x%04x not supported", __func__, cmd);
 826                 break;
 827         }
 828         return -ENOIOCTLCMD;
 829 }
 830
 831
 832 static void oti6858_shutdown(struct usb_serial *serial)
 833 {
 834         struct oti6858_private *priv;
 835         int i;
 836
 837         dbg("%s()", __func__);
 838
 839         for (i = 0; i < serial->num_ports; ++i) {
 840                 priv = usb_get_serial_port_data(serial->port[i]);
 841                 if (priv) {
 842                         oti6858_buf_free(priv->buf);
 843                         kfree(priv);
 844                         usb_set_serial_port_data(serial->port[i], NULL);
 845                 }
 846         }
 847 }
 848
 849 static void oti6858_read_int_callback(struct urb *urb)
 850 {
 851         struct usb_serial_port *port =  urb->context;
 852         struct oti6858_private *priv = usb_get_serial_port_data(port);
 853         int transient = 0, can_recv = 0, resubmit = 1;
 854         int status = urb->status;
 855
 856         dbg("%s(port = %d, status = %d)",
 857                                 __func__, port->number, status);
 858
 859         switch (status) {
 860         case 0:
 861                 /* success */
 862                 break;
 863         case -ECONNRESET:
 864         case -ENOENT:
 865         case -ESHUTDOWN:
 866                 /* this urb is terminated, clean up */
 867                 dbg("%s(): urb shutting down with status: %d",
 868                                         __func__, status);
 869                 return;
 870         default:
 871                 dbg("%s(): nonzero urb status received: %d",
 872                                         __func__, status);
 873                 break;
 874         }
 875
 876         if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
 877                 struct oti6858_control_pkt *xs = urb->transfer_buffer;
 878                 unsigned long flags;
 879
 880                 spin_lock_irqsave(&priv->lock, flags);
 881
 882                 if (!priv->transient) {
 883                         if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
 884                                 if (xs->rx_bytes_avail == 0) {
 885                                         priv->transient = 4;
 886                                         priv->setup_done = 0;
 887                                         resubmit = 0;
 888                                         dbg("%s(): scheduling setup_line()",
 889                                             __func__);
 890                                         schedule_delayed_work(&priv->delayed_setup_work, 0);
 891                                 }
 892                         }
 893                 } else {
 894                         if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
 895                                 priv->transient = 0;
 896                         } else if (!priv->setup_done) {
 897                                 resubmit = 0;
 898                         } else if (--priv->transient == 0) {
 899                                 if (xs->rx_bytes_avail == 0) {
 900                                         priv->transient = 4;
 901                                         priv->setup_done = 0;
 902                                         resubmit = 0;
 903                                         dbg("%s(): scheduling setup_line()",
 904                                             __func__);
 905                                         schedule_delayed_work(&priv->delayed_setup_work, 0);
 906                                 }
 907                         }
 908                 }
 909
 910                 if (!priv->transient) {
 911                         if (xs->pin_state != priv->status.pin_state)
 912                                 wake_up_interruptible(&priv->intr_wait);
 913                         memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
 914                 }
 915
 916                 if (!priv->transient && xs->rx_bytes_avail != 0) {
 917                         can_recv = xs->rx_bytes_avail;
 918                         priv->flags.read_urb_in_use = 1;
 919                 }
 920
 921                 transient = priv->transient;
 922                 spin_unlock_irqrestore(&priv->lock, flags);
 923         }
 924
 925         if (can_recv) {
 926                 int result;
 927
 928                 port->read_urb->dev = port->serial->dev;
 929                 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 930                 if (result != 0) {
 931                         priv->flags.read_urb_in_use = 0;
 932                         dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
 933                                         " error %d\n", __func__, result);
 934                 } else {
 935                         resubmit = 0;
 936                 }
 937         } else if (!transient) {
 938                 unsigned long flags;
 939
 940                 spin_lock_irqsave(&priv->lock, flags);
 941                 if (priv->flags.write_urb_in_use == 0
 942                                 && oti6858_buf_data_avail(priv->buf) != 0) {
 943                         schedule_delayed_work(&priv->delayed_write_work, 0);
 944                         resubmit = 0;
 945                 }
 946                 spin_unlock_irqrestore(&priv->lock, flags);
 947         }
 948
 949         if (resubmit) {
 950                 int result;
 951
 952 /*              dbg("%s(): submitting interrupt urb", __func__); */
 953                 urb->dev = port->serial->dev;
 954                 result = usb_submit_urb(urb, GFP_ATOMIC);
 955                 if (result != 0) {
 956                         dev_err(&urb->dev->dev,
 957                                         "%s(): usb_submit_urb() failed with"
 958                                         " error %d\n", __func__, result);
 959                 }
 960         }
 961 }
 962
 963 static void oti6858_read_bulk_callback(struct urb *urb)
 964 {
 965         struct usb_serial_port *port =  urb->context;
 966         struct oti6858_private *priv = usb_get_serial_port_data(port);
 967         struct tty_struct *tty;
 968         unsigned char *data = urb->transfer_buffer;
 969         unsigned long flags;
 970         int status = urb->status;
 971         int result;
 972
 973         dbg("%s(port = %d, status = %d)",
 974                                 __func__, port->number, status);
 975
 976         spin_lock_irqsave(&priv->lock, flags);
 977         priv->flags.read_urb_in_use = 0;
 978         spin_unlock_irqrestore(&priv->lock, flags);
 979
 980         if (status != 0) {
 981                 if (!port->port.count) {
 982                         dbg("%s(): port is closed, exiting", __func__);
 983                         return;
 984                 }
 985                 /*
 986                 if (status == -EPROTO) {
 987                         * PL2303 mysteriously fails with -EPROTO reschedule
 988                            the read *
 989                         dbg("%s - caught -EPROTO, resubmitting the urb",
 990                                                                 __func__);
 991                         result = usb_submit_urb(urb, GFP_ATOMIC);
 992                         if (result)
 993                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
 994                         return;
 995                 }
 996                 */
 997                 dbg("%s(): unable to handle the error, exiting", __func__);
 998                 return;
 999         }
1000
1001         tty = tty_port_tty_get(&port->port);
1002         if (tty != NULL && urb->actual_length > 0) {
1003                 tty_insert_flip_string(tty, data, urb->actual_length);
1004                 tty_flip_buffer_push(tty);
1005         }
1006         tty_kref_put(tty);
1007
1008         /* schedule the interrupt urb if we are still open */
1009         if (port->port.count != 0) {
1010                 port->interrupt_in_urb->dev = port->serial->dev;
1011                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1012                 if (result != 0) {
1013                         dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
1014                                         " error %d\n", __func__, result);
1015                 }
1016         }
1017 }
1018
1019 static void oti6858_write_bulk_callback(struct urb *urb)
1020 {
1021         struct usb_serial_port *port =  urb->context;
1022         struct oti6858_private *priv = usb_get_serial_port_data(port);
1023         int status = urb->status;
1024         int result;
1025
1026         dbg("%s(port = %d, status = %d)",
1027                                 __func__, port->number, status);
1028
1029         switch (status) {
1030         case 0:
1031                 /* success */
1032                 break;
1033         case -ECONNRESET:
1034         case -ENOENT:
1035         case -ESHUTDOWN:
1036                 /* this urb is terminated, clean up */
1037                 dbg("%s(): urb shutting down with status: %d",
1038                                         __func__, status);
1039                 priv->flags.write_urb_in_use = 0;
1040                 return;
1041         default:
1042                 /* error in the urb, so we have to resubmit it */
1043                 dbg("%s(): nonzero write bulk status received: %d",
1044                                         __func__, status);
1045                 dbg("%s(): overflow in write", __func__);
1046
1047                 port->write_urb->transfer_buffer_length = 1;
1048                 port->write_urb->dev = port->serial->dev;
1049                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1050                 if (result) {
1051                         dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
1052                                         " error %d\n", __func__, result);
1053                 } else {
1054                         return;
1055                 }
1056         }
1057
1058         priv->flags.write_urb_in_use = 0;
1059
1060         /* schedule the interrupt urb if we are still open */
1061         port->interrupt_in_urb->dev = port->serial->dev;
1062         dbg("%s(): submitting interrupt urb", __func__);
1063         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1064         if (result != 0) {
1065                 dev_err(&port->dev, "%s(): failed submitting int urb,"
1066                                         " error %d\n", __func__, result);
1067         }
1068 }
1069
1070
1071 /*
1072  * oti6858_buf_alloc
1073  *
1074  * Allocate a circular buffer and all associated memory.
1075  */
1076 static struct oti6858_buf *oti6858_buf_alloc(unsigned int size)
1077 {
1078         struct oti6858_buf *pb;
1079
1080         if (size == 0)
1081                 return NULL;
1082
1083         pb = kmalloc(sizeof(struct oti6858_buf), GFP_KERNEL);
1084         if (pb == NULL)
1085                 return NULL;
1086
1087         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1088         if (pb->buf_buf == NULL) {
1089                 kfree(pb);
1090                 return NULL;
1091         }
1092
1093         pb->buf_size = size;
1094         pb->buf_get = pb->buf_put = pb->buf_buf;
1095
1096         return pb;
1097 }
1098
1099 /*
1100  * oti6858_buf_free
1101  *
1102  * Free the buffer and all associated memory.
1103  */
1104 static void oti6858_buf_free(struct oti6858_buf *pb)
1105 {
1106         if (pb) {
1107                 kfree(pb->buf_buf);
1108                 kfree(pb);
1109         }
1110 }
1111
1112 /*
1113  * oti6858_buf_clear
1114  *
1115  * Clear out all data in the circular buffer.
1116  */
1117 static void oti6858_buf_clear(struct oti6858_buf *pb)
1118 {
1119         if (pb != NULL) {
1120                 /* equivalent to a get of all data available */
1121                 pb->buf_get = pb->buf_put;
1122         }
1123 }
1124
1125 /*
1126  * oti6858_buf_data_avail
1127  *
1128  * Return the number of bytes of data available in the circular
1129  * buffer.
1130  */
1131 static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb)
1132 {
1133         if (pb == NULL)
1134                 return 0;
1135         return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
1136 }
1137
1138 /*
1139  * oti6858_buf_space_avail
1140  *
1141  * Return the number of bytes of space available in the circular
1142  * buffer.
1143  */
1144 static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb)
1145 {
1146         if (pb == NULL)
1147                 return 0;
1148         return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
1149 }
1150
1151 /*
1152  * oti6858_buf_put
1153  *
1154  * Copy data data from a user buffer and put it into the circular buffer.
1155  * Restrict to the amount of space available.
1156  *
1157  * Return the number of bytes copied.
1158  */
1159 static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
1160                                         unsigned int count)
1161 {
1162         unsigned int len;
1163
1164         if (pb == NULL)
1165                 return 0;
1166
1167         len  = oti6858_buf_space_avail(pb);
1168         if (count > len)
1169                 count = len;
1170
1171         if (count == 0)
1172                 return 0;
1173
1174         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1175         if (count > len) {
1176                 memcpy(pb->buf_put, buf, len);
1177                 memcpy(pb->buf_buf, buf+len, count - len);
1178                 pb->buf_put = pb->buf_buf + count - len;
1179         } else {
1180                 memcpy(pb->buf_put, buf, count);
1181                 if (count < len)
1182                         pb->buf_put += count;
1183                 else /* count == len */
1184                         pb->buf_put = pb->buf_buf;
1185         }
1186
1187         return count;
1188 }
1189
1190 /*
1191  * oti6858_buf_get
1192  *
1193  * Get data from the circular buffer and copy to the given buffer.
1194  * Restrict to the amount of data available.
1195  *
1196  * Return the number of bytes copied.
1197  */
1198 static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
1199                                         unsigned int count)
1200 {
1201         unsigned int len;
1202
1203         if (pb == NULL)
1204                 return 0;
1205
1206         len = oti6858_buf_data_avail(pb);
1207         if (count > len)
1208                 count = len;
1209
1210         if (count == 0)
1211                 return 0;
1212
1213         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1214         if (count > len) {
1215                 memcpy(buf, pb->buf_get, len);
1216                 memcpy(buf+len, pb->buf_buf, count - len);
1217                 pb->buf_get = pb->buf_buf + count - len;
1218         } else {
1219                 memcpy(buf, pb->buf_get, count);
1220                 if (count < len)
1221                         pb->buf_get += count;
1222                 else /* count == len */
1223                         pb->buf_get = pb->buf_buf;
1224         }
1225
1226         return count;
1227 }
1228
1229 /* module description and (de)initialization */
1230
1231 static int __init oti6858_init(void)
1232 {
1233         int retval;
1234
1235         retval = usb_serial_register(&oti6858_device);
1236         if (retval == 0) {
1237                 retval = usb_register(&oti6858_driver);
1238                 if (retval)
1239                         usb_serial_deregister(&oti6858_device);
1240         }
1241         return retval;
1242 }
1243
1244 static void __exit oti6858_exit(void)
1245 {
1246         usb_deregister(&oti6858_driver);
1247         usb_serial_deregister(&oti6858_device);
1248 }
1249
1250 module_init(oti6858_init);
1251 module_exit(oti6858_exit);
1252
1253 MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
1254 MODULE_AUTHOR(OTI6858_AUTHOR);
1255 MODULE_VERSION(OTI6858_VERSION);
1256 MODULE_LICENSE("GPL");
1257
1258 module_param(debug, bool, S_IRUGO | S_IWUSR);
1259 MODULE_PARM_DESC(debug, "enable debug output");
1260