drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2003 IBM Corp.
   6  *
   7  * Original driver for 2.2.x by anonymous
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this driver
  14  *
  15  */
  16
  17 #include <linux/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_driver.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/serial.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/spinlock.h>
  29 #include <asm/uaccess.h>
  30 #include <linux/usb.h>
  31 #include "usb-serial.h"
  32 #include "pl2303.h"
  33
  34 /*
  35  * Version Information
  36  */
  37 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  38
  39 static int debug;
  40
  41 #define PL2303_CLOSING_WAIT     (30*HZ)
  42
  43 #define PL2303_BUF_SIZE         1024
  44 #define PL2303_TMP_BUF_SIZE     1024
  45
  46 struct pl2303_buf {
  47         unsigned int    buf_size;
  48         char            *buf_buf;
  49         char            *buf_get;
  50         char            *buf_put;
  51 };
  52
  53 static struct usb_device_id id_table [] = {
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  56         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  57         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  58         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  59         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  60         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  61         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  62         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  63         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  64         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  65         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  66         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  67         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  68         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  69         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  70         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  71         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  72         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  75         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  76         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  77         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  78         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  79         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  80         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  81         { USB_DEVICE(OTI_VENDOR_ID, OTI_PRODUCT_ID) },
  82         { }                                     /* Terminating entry */
  83 };
  84
  85 MODULE_DEVICE_TABLE (usb, id_table);
  86
  87 static struct usb_driver pl2303_driver = {
  88         .name =         "pl2303",
  89         .probe =        usb_serial_probe,
  90         .disconnect =   usb_serial_disconnect,
  91         .id_table =     id_table,
  92         .no_dynamic_id =        1,
  93 };
  94
  95 #define SET_LINE_REQUEST_TYPE           0x21
  96 #define SET_LINE_REQUEST                0x20
  97
  98 #define SET_CONTROL_REQUEST_TYPE        0x21
  99 #define SET_CONTROL_REQUEST             0x22
 100 #define CONTROL_DTR                     0x01
 101 #define CONTROL_RTS                     0x02
 102
 103 #define BREAK_REQUEST_TYPE              0x21
 104 #define BREAK_REQUEST                   0x23
 105 #define BREAK_ON                        0xffff
 106 #define BREAK_OFF                       0x0000
 107
 108 #define GET_LINE_REQUEST_TYPE           0xa1
 109 #define GET_LINE_REQUEST                0x21
 110
 111 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 112 #define VENDOR_WRITE_REQUEST            0x01
 113
 114 #define VENDOR_READ_REQUEST_TYPE        0xc0
 115 #define VENDOR_READ_REQUEST             0x01
 116
 117 #define UART_STATE                      0x08
 118 #define UART_STATE_TRANSIENT_MASK       0x74
 119 #define UART_DCD                        0x01
 120 #define UART_DSR                        0x02
 121 #define UART_BREAK_ERROR                0x04
 122 #define UART_RING                       0x08
 123 #define UART_FRAME_ERROR                0x10
 124 #define UART_PARITY_ERROR               0x20
 125 #define UART_OVERRUN_ERROR              0x40
 126 #define UART_CTS                        0x80
 127
 128 /* function prototypes for a PL2303 serial converter */
 129 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 130 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 131 static void pl2303_set_termios (struct usb_serial_port *port,
 132                                 struct termios *old);
 133 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 134                          unsigned int cmd, unsigned long arg);
 135 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 136 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 137 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 138 static int pl2303_write (struct usb_serial_port *port,
 139                          const unsigned char *buf, int count);
 140 static void pl2303_send (struct usb_serial_port *port);
 141 static int pl2303_write_room(struct usb_serial_port *port);
 142 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 143 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 144 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 145 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 146                             unsigned int set, unsigned int clear);
 147 static int pl2303_startup (struct usb_serial *serial);
 148 static void pl2303_shutdown (struct usb_serial *serial);
 149 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 150 static void pl2303_buf_free(struct pl2303_buf *pb);
 151 static void pl2303_buf_clear(struct pl2303_buf *pb);
 152 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 153 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 154 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 155         unsigned int count);
 156 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 157         unsigned int count);
 158
 159
 160 /* All of the device info needed for the PL2303 SIO serial converter */
 161 static struct usb_serial_driver pl2303_device = {
 162         .driver = {
 163                 .owner =        THIS_MODULE,
 164                 .name =         "pl2303",
 165         },
 166         .id_table =             id_table,
 167         .num_interrupt_in =     NUM_DONT_CARE,
 168         .num_bulk_in =          1,
 169         .num_bulk_out =         1,
 170         .num_ports =            1,
 171         .open =                 pl2303_open,
 172         .close =                pl2303_close,
 173         .write =                pl2303_write,
 174         .ioctl =                pl2303_ioctl,
 175         .break_ctl =            pl2303_break_ctl,
 176         .set_termios =          pl2303_set_termios,
 177         .tiocmget =             pl2303_tiocmget,
 178         .tiocmset =             pl2303_tiocmset,
 179         .read_bulk_callback =   pl2303_read_bulk_callback,
 180         .read_int_callback =    pl2303_read_int_callback,
 181         .write_bulk_callback =  pl2303_write_bulk_callback,
 182         .write_room =           pl2303_write_room,
 183         .chars_in_buffer =      pl2303_chars_in_buffer,
 184         .attach =               pl2303_startup,
 185         .shutdown =             pl2303_shutdown,
 186 };
 187
 188 enum pl2303_type {
 189         type_0,         /* don't know the difference between type 0 and */
 190         type_1,         /* type 1, until someone from prolific tells us... */
 191         HX,             /* HX version of the pl2303 chip */
 192 };
 193
 194 struct pl2303_private {
 195         spinlock_t lock;
 196         struct pl2303_buf *buf;
 197         int write_urb_in_use;
 198         wait_queue_head_t delta_msr_wait;
 199         u8 line_control;
 200         u8 line_status;
 201         u8 termios_initialized;
 202         enum pl2303_type type;
 203 };
 204
 205
 206 static int pl2303_startup (struct usb_serial *serial)
 207 {
 208         struct pl2303_private *priv;
 209         enum pl2303_type type = type_0;
 210         int i;
 211
 212         if (serial->dev->descriptor.bDeviceClass == 0x02)
 213                 type = type_0;
 214         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 215                 type = HX;
 216         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 217                 type = type_1;
 218         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 219                 type = type_1;
 220         dbg("device type: %d", type);
 221
 222         for (i = 0; i < serial->num_ports; ++i) {
 223                 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
 224                 if (!priv)
 225                         goto cleanup;
 226                 spin_lock_init(&priv->lock);
 227                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 228                 if (priv->buf == NULL) {
 229                         kfree(priv);
 230                         goto cleanup;
 231                 }
 232                 init_waitqueue_head(&priv->delta_msr_wait);
 233                 priv->type = type;
 234                 usb_set_serial_port_data(serial->port[i], priv);
 235         }
 236         return 0;
 237
 238 cleanup:
 239         for (--i; i>=0; --i) {
 240                 priv = usb_get_serial_port_data(serial->port[i]);
 241                 pl2303_buf_free(priv->buf);
 242                 kfree(priv);
 243                 usb_set_serial_port_data(serial->port[i], NULL);
 244         }
 245         return -ENOMEM;
 246 }
 247
 248 static int set_control_lines (struct usb_device *dev, u8 value)
 249 {
 250         int retval;
 251
 252         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 253                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 254                                   value, 0, NULL, 0, 100);
 255         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 256         return retval;
 257 }
 258
 259 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 260 {
 261         struct pl2303_private *priv = usb_get_serial_port_data(port);
 262         unsigned long flags;
 263
 264         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 265
 266         if (!count)
 267                 return count;
 268
 269         spin_lock_irqsave(&priv->lock, flags);
 270         count = pl2303_buf_put(priv->buf, buf, count);
 271         spin_unlock_irqrestore(&priv->lock, flags);
 272
 273         pl2303_send(port);
 274
 275         return count;
 276 }
 277
 278 static void pl2303_send(struct usb_serial_port *port)
 279 {
 280         int count, result;
 281         struct pl2303_private *priv = usb_get_serial_port_data(port);
 282         unsigned long flags;
 283
 284         dbg("%s - port %d", __FUNCTION__, port->number);
 285
 286         spin_lock_irqsave(&priv->lock, flags);
 287
 288         if (priv->write_urb_in_use) {
 289                 spin_unlock_irqrestore(&priv->lock, flags);
 290                 return;
 291         }
 292
 293         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 294                 port->bulk_out_size);
 295
 296         if (count == 0) {
 297                 spin_unlock_irqrestore(&priv->lock, flags);
 298                 return;
 299         }
 300
 301         priv->write_urb_in_use = 1;
 302
 303         spin_unlock_irqrestore(&priv->lock, flags);
 304
 305         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 306
 307         port->write_urb->transfer_buffer_length = count;
 308         port->write_urb->dev = port->serial->dev;
 309         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 310         if (result) {
 311                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 312                 priv->write_urb_in_use = 0;
 313                 // TODO: reschedule pl2303_send
 314         }
 315
 316         schedule_work(&port->work);
 317 }
 318
 319 static int pl2303_write_room(struct usb_serial_port *port)
 320 {
 321         struct pl2303_private *priv = usb_get_serial_port_data(port);
 322         int room = 0;
 323         unsigned long flags;
 324
 325         dbg("%s - port %d", __FUNCTION__, port->number);
 326
 327         spin_lock_irqsave(&priv->lock, flags);
 328         room = pl2303_buf_space_avail(priv->buf);
 329         spin_unlock_irqrestore(&priv->lock, flags);
 330
 331         dbg("%s - returns %d", __FUNCTION__, room);
 332         return room;
 333 }
 334
 335 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 336 {
 337         struct pl2303_private *priv = usb_get_serial_port_data(port);
 338         int chars = 0;
 339         unsigned long flags;
 340
 341         dbg("%s - port %d", __FUNCTION__, port->number);
 342
 343         spin_lock_irqsave(&priv->lock, flags);
 344         chars = pl2303_buf_data_avail(priv->buf);
 345         spin_unlock_irqrestore(&priv->lock, flags);
 346
 347         dbg("%s - returns %d", __FUNCTION__, chars);
 348         return chars;
 349 }
 350
 351 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 352 {
 353         struct usb_serial *serial = port->serial;
 354         struct pl2303_private *priv = usb_get_serial_port_data(port);
 355         unsigned long flags;
 356         unsigned int cflag;
 357         unsigned char *buf;
 358         int baud;
 359         int i;
 360         u8 control;
 361
 362         dbg("%s -  port %d", __FUNCTION__, port->number);
 363
 364         if ((!port->tty) || (!port->tty->termios)) {
 365                 dbg("%s - no tty structures", __FUNCTION__);
 366                 return;
 367         }
 368
 369         spin_lock_irqsave(&priv->lock, flags);
 370         if (!priv->termios_initialized) {
 371                 *(port->tty->termios) = tty_std_termios;
 372                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 373                 priv->termios_initialized = 1;
 374         }
 375         spin_unlock_irqrestore(&priv->lock, flags);
 376
 377         cflag = port->tty->termios->c_cflag;
 378         /* check that they really want us to change something */
 379         if (old_termios) {
 380                 if ((cflag == old_termios->c_cflag) &&
 381                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 382                     dbg("%s - nothing to change...", __FUNCTION__);
 383                     return;
 384                 }
 385         }
 386
 387         buf = kzalloc (7, GFP_KERNEL);
 388         if (!buf) {
 389                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 390                 return;
 391         }
 392
 393         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 394                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 395                              0, 0, buf, 7, 100);
 396         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 397              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 398
 399
 400         if (cflag & CSIZE) {
 401                 switch (cflag & CSIZE) {
 402                         case CS5:       buf[6] = 5;     break;
 403                         case CS6:       buf[6] = 6;     break;
 404                         case CS7:       buf[6] = 7;     break;
 405                         default:
 406                         case CS8:       buf[6] = 8;     break;
 407                 }
 408                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 409         }
 410
 411         baud = 0;
 412         switch (cflag & CBAUD) {
 413                 case B0:        baud = 0;       break;
 414                 case B75:       baud = 75;      break;
 415                 case B150:      baud = 150;     break;
 416                 case B300:      baud = 300;     break;
 417                 case B600:      baud = 600;     break;
 418                 case B1200:     baud = 1200;    break;
 419                 case B1800:     baud = 1800;    break;
 420                 case B2400:     baud = 2400;    break;
 421                 case B4800:     baud = 4800;    break;
 422                 case B9600:     baud = 9600;    break;
 423                 case B19200:    baud = 19200;   break;
 424                 case B38400:    baud = 38400;   break;
 425                 case B57600:    baud = 57600;   break;
 426                 case B115200:   baud = 115200;  break;
 427                 case B230400:   baud = 230400;  break;
 428                 case B460800:   baud = 460800;  break;
 429                 default:
 430                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 431                         break;
 432         }
 433         dbg("%s - baud = %d", __FUNCTION__, baud);
 434         if (baud) {
 435                 buf[0] = baud & 0xff;
 436                 buf[1] = (baud >> 8) & 0xff;
 437                 buf[2] = (baud >> 16) & 0xff;
 438                 buf[3] = (baud >> 24) & 0xff;
 439         }
 440
 441         /* For reference buf[4]=0 is 1 stop bits */
 442         /* For reference buf[4]=1 is 1.5 stop bits */
 443         /* For reference buf[4]=2 is 2 stop bits */
 444         if (cflag & CSTOPB) {
 445                 buf[4] = 2;
 446                 dbg("%s - stop bits = 2", __FUNCTION__);
 447         } else {
 448                 buf[4] = 0;
 449                 dbg("%s - stop bits = 1", __FUNCTION__);
 450         }
 451
 452         if (cflag & PARENB) {
 453                 /* For reference buf[5]=0 is none parity */
 454                 /* For reference buf[5]=1 is odd parity */
 455                 /* For reference buf[5]=2 is even parity */
 456                 /* For reference buf[5]=3 is mark parity */
 457                 /* For reference buf[5]=4 is space parity */
 458                 if (cflag & PARODD) {
 459                         buf[5] = 1;
 460                         dbg("%s - parity = odd", __FUNCTION__);
 461                 } else {
 462                         buf[5] = 2;
 463                         dbg("%s - parity = even", __FUNCTION__);
 464                 }
 465         } else {
 466                 buf[5] = 0;
 467                 dbg("%s - parity = none", __FUNCTION__);
 468         }
 469
 470         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 471                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 472                              0, 0, buf, 7, 100);
 473         dbg ("0x21:0x20:0:0  %d", i);
 474
 475         /* change control lines if we are switching to or from B0 */
 476         spin_lock_irqsave(&priv->lock, flags);
 477         control = priv->line_control;
 478         if ((cflag & CBAUD) == B0)
 479                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 480         else
 481                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 482         if (control != priv->line_control) {
 483                 control = priv->line_control;
 484                 spin_unlock_irqrestore(&priv->lock, flags);
 485                 set_control_lines(serial->dev, control);
 486         } else {
 487                 spin_unlock_irqrestore(&priv->lock, flags);
 488         }
 489
 490         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 491
 492         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 493                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 494                              0, 0, buf, 7, 100);
 495         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 496              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 497
 498         if (cflag & CRTSCTS) {
 499                 __u16 index;
 500                 if (priv->type == HX)
 501                         index = 0x61;
 502                 else
 503                         index = 0x41;
 504                 i = usb_control_msg(serial->dev,
 505                                     usb_sndctrlpipe(serial->dev, 0),
 506                                     VENDOR_WRITE_REQUEST,
 507                                     VENDOR_WRITE_REQUEST_TYPE,
 508                                     0x0, index, NULL, 0, 100);
 509                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 510         }
 511
 512         kfree (buf);
 513 }
 514
 515 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 516 {
 517         struct termios tmp_termios;
 518         struct usb_serial *serial = port->serial;
 519         struct pl2303_private *priv = usb_get_serial_port_data(port);
 520         unsigned char *buf;
 521         int result;
 522
 523         dbg("%s -  port %d", __FUNCTION__, port->number);
 524
 525         if (priv->type != HX) {
 526                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 527                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 528         }
 529
 530         buf = kmalloc(10, GFP_KERNEL);
 531         if (buf==NULL)
 532                 return -ENOMEM;
 533
 534 #define FISH(a,b,c,d)                                                           \
 535         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 536                                b, a, c, d, buf, 1, 100);                        \
 537         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 538
 539 #define SOUP(a,b,c,d)                                                           \
 540         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 541                                b, a, c, d, NULL, 0, 100);                       \
 542         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 543
 544         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 545         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 546         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 547         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 548         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 549         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 550         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 551         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 552         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 553         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 554
 555         if (priv->type == HX) {
 556                 /* HX chip */
 557                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 558                 /* reset upstream data pipes */
 559                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 560                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 561         } else {
 562                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 563         }
 564
 565         kfree(buf);
 566
 567         /* Setup termios */
 568         if (port->tty) {
 569                 pl2303_set_termios (port, &tmp_termios);
 570         }
 571
 572         //FIXME: need to assert RTS and DTR if CRTSCTS off
 573
 574         dbg("%s - submitting read urb", __FUNCTION__);
 575         port->read_urb->dev = serial->dev;
 576         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 577         if (result) {
 578                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 579                 pl2303_close (port, NULL);
 580                 return -EPROTO;
 581         }
 582
 583         dbg("%s - submitting interrupt urb", __FUNCTION__);
 584         port->interrupt_in_urb->dev = serial->dev;
 585         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 586         if (result) {
 587                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 588                 pl2303_close (port, NULL);
 589                 return -EPROTO;
 590         }
 591         return 0;
 592 }
 593
 594
 595 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 596 {
 597         struct pl2303_private *priv = usb_get_serial_port_data(port);
 598         unsigned long flags;
 599         unsigned int c_cflag;
 600         int bps;
 601         long timeout;
 602         wait_queue_t wait;                                              \
 603
 604         dbg("%s - port %d", __FUNCTION__, port->number);
 605
 606         /* wait for data to drain from the buffer */
 607         spin_lock_irqsave(&priv->lock, flags);
 608         timeout = PL2303_CLOSING_WAIT;
 609         init_waitqueue_entry(&wait, current);
 610         add_wait_queue(&port->tty->write_wait, &wait);
 611         for (;;) {
 612                 set_current_state(TASK_INTERRUPTIBLE);
 613                 if (pl2303_buf_data_avail(priv->buf) == 0
 614                 || timeout == 0 || signal_pending(current)
 615                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 616                         break;
 617                 spin_unlock_irqrestore(&priv->lock, flags);
 618                 timeout = schedule_timeout(timeout);
 619                 spin_lock_irqsave(&priv->lock, flags);
 620         }
 621         set_current_state(TASK_RUNNING);
 622         remove_wait_queue(&port->tty->write_wait, &wait);
 623         /* clear out any remaining data in the buffer */
 624         pl2303_buf_clear(priv->buf);
 625         spin_unlock_irqrestore(&priv->lock, flags);
 626
 627         /* wait for characters to drain from the device */
 628         /* (this is long enough for the entire 256 byte */
 629         /* pl2303 hardware buffer to drain with no flow */
 630         /* control for data rates of 1200 bps or more, */
 631         /* for lower rates we should really know how much */
 632         /* data is in the buffer to compute a delay */
 633         /* that is not unnecessarily long) */
 634         bps = tty_get_baud_rate(port->tty);
 635         if (bps > 1200)
 636                 timeout = max((HZ*2560)/bps,HZ/10);
 637         else
 638                 timeout = 2*HZ;
 639         schedule_timeout_interruptible(timeout);
 640
 641         /* shutdown our urbs */
 642         dbg("%s - shutting down urbs", __FUNCTION__);
 643         usb_kill_urb(port->write_urb);
 644         usb_kill_urb(port->read_urb);
 645         usb_kill_urb(port->interrupt_in_urb);
 646
 647         if (port->tty) {
 648                 c_cflag = port->tty->termios->c_cflag;
 649                 if (c_cflag & HUPCL) {
 650                         /* drop DTR and RTS */
 651                         spin_lock_irqsave(&priv->lock, flags);
 652                         priv->line_control = 0;
 653                         spin_unlock_irqrestore (&priv->lock, flags);
 654                         set_control_lines (port->serial->dev, 0);
 655                 }
 656         }
 657 }
 658
 659 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 660                             unsigned int set, unsigned int clear)
 661 {
 662         struct pl2303_private *priv = usb_get_serial_port_data(port);
 663         unsigned long flags;
 664         u8 control;
 665
 666         if (!usb_get_intfdata(port->serial->interface))
 667                 return -ENODEV;
 668
 669         spin_lock_irqsave (&priv->lock, flags);
 670         if (set & TIOCM_RTS)
 671                 priv->line_control |= CONTROL_RTS;
 672         if (set & TIOCM_DTR)
 673                 priv->line_control |= CONTROL_DTR;
 674         if (clear & TIOCM_RTS)
 675                 priv->line_control &= ~CONTROL_RTS;
 676         if (clear & TIOCM_DTR)
 677                 priv->line_control &= ~CONTROL_DTR;
 678         control = priv->line_control;
 679         spin_unlock_irqrestore (&priv->lock, flags);
 680
 681         return set_control_lines (port->serial->dev, control);
 682 }
 683
 684 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 685 {
 686         struct pl2303_private *priv = usb_get_serial_port_data(port);
 687         unsigned long flags;
 688         unsigned int mcr;
 689         unsigned int status;
 690         unsigned int result;
 691
 692         dbg("%s (%d)", __FUNCTION__, port->number);
 693
 694         if (!usb_get_intfdata(port->serial->interface))
 695                 return -ENODEV;
 696
 697         spin_lock_irqsave (&priv->lock, flags);
 698         mcr = priv->line_control;
 699         status = priv->line_status;
 700         spin_unlock_irqrestore (&priv->lock, flags);
 701
 702         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 703                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 704                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 705                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 706                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 707                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 708
 709         dbg("%s - result = %x", __FUNCTION__, result);
 710
 711         return result;
 712 }
 713
 714 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 715 {
 716         struct pl2303_private *priv = usb_get_serial_port_data(port);
 717         unsigned long flags;
 718         unsigned int prevstatus;
 719         unsigned int status;
 720         unsigned int changed;
 721
 722         spin_lock_irqsave (&priv->lock, flags);
 723         prevstatus = priv->line_status;
 724         spin_unlock_irqrestore (&priv->lock, flags);
 725
 726         while (1) {
 727                 interruptible_sleep_on(&priv->delta_msr_wait);
 728                 /* see if a signal did it */
 729                 if (signal_pending(current))
 730                         return -ERESTARTSYS;
 731
 732                 spin_lock_irqsave (&priv->lock, flags);
 733                 status = priv->line_status;
 734                 spin_unlock_irqrestore (&priv->lock, flags);
 735
 736                 changed=prevstatus^status;
 737
 738                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 739                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 740                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 741                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 742                         return 0;
 743                 }
 744                 prevstatus = status;
 745         }
 746         /* NOTREACHED */
 747         return 0;
 748 }
 749
 750 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 751 {
 752         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 753
 754         switch (cmd) {
 755                 case TIOCMIWAIT:
 756                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 757                         return wait_modem_info(port, arg);
 758
 759                 default:
 760                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 761                         break;
 762         }
 763
 764         return -ENOIOCTLCMD;
 765 }
 766
 767 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 768 {
 769         struct usb_serial *serial = port->serial;
 770         u16 state;
 771         int result;
 772
 773         dbg("%s - port %d", __FUNCTION__, port->number);
 774
 775         if (break_state == 0)
 776                 state = BREAK_OFF;
 777         else
 778                 state = BREAK_ON;
 779         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 780
 781         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 782                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 783                                   0, NULL, 0, 100);
 784         if (result)
 785                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 786 }
 787
 788
 789 static void pl2303_shutdown (struct usb_serial *serial)
 790 {
 791         int i;
 792         struct pl2303_private *priv;
 793
 794         dbg("%s", __FUNCTION__);
 795
 796         for (i = 0; i < serial->num_ports; ++i) {
 797                 priv = usb_get_serial_port_data(serial->port[i]);
 798                 if (priv) {
 799                         pl2303_buf_free(priv->buf);
 800                         kfree(priv);
 801                         usb_set_serial_port_data(serial->port[i], NULL);
 802                 }
 803         }
 804 }
 805
 806 static void pl2303_update_line_status(struct usb_serial_port *port,
 807                                       unsigned char *data,
 808                                       unsigned int actual_length)
 809 {
 810
 811         struct pl2303_private *priv = usb_get_serial_port_data(port);
 812         unsigned long flags;
 813         u8 status_idx = UART_STATE;
 814         u8 length = UART_STATE + 1;
 815
 816         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 817             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
 818              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
 819              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
 820                 length = 1;
 821                 status_idx = 0;
 822         }
 823
 824         if (actual_length < length)
 825                 goto exit;
 826
 827         /* Save off the uart status for others to look at */
 828         spin_lock_irqsave(&priv->lock, flags);
 829         priv->line_status = data[status_idx];
 830         spin_unlock_irqrestore(&priv->lock, flags);
 831         wake_up_interruptible (&priv->delta_msr_wait);
 832
 833 exit:
 834         return;
 835 }
 836
 837 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 838 {
 839         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 840         unsigned char *data = urb->transfer_buffer;
 841         unsigned int actual_length = urb->actual_length;
 842         int status;
 843
 844         dbg("%s (%d)", __FUNCTION__, port->number);
 845
 846         switch (urb->status) {
 847         case 0:
 848                 /* success */
 849                 break;
 850         case -ECONNRESET:
 851         case -ENOENT:
 852         case -ESHUTDOWN:
 853                 /* this urb is terminated, clean up */
 854                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 855                 return;
 856         default:
 857                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 858                 goto exit;
 859         }
 860
 861         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 862         pl2303_update_line_status(port, data, actual_length);
 863
 864 exit:
 865         status = usb_submit_urb (urb, GFP_ATOMIC);
 866         if (status)
 867                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 868                         __FUNCTION__, status);
 869 }
 870
 871
 872 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 873 {
 874         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 875         struct pl2303_private *priv = usb_get_serial_port_data(port);
 876         struct tty_struct *tty;
 877         unsigned char *data = urb->transfer_buffer;
 878         unsigned long flags;
 879         int i;
 880         int result;
 881         u8 status;
 882         char tty_flag;
 883
 884         dbg("%s - port %d", __FUNCTION__, port->number);
 885
 886         if (urb->status) {
 887                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 888                 if (!port->open_count) {
 889                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 890                         return;
 891                 }
 892                 if (urb->status == -EPROTO) {
 893                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 894                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 895                         urb->status = 0;
 896                         urb->dev = port->serial->dev;
 897                         result = usb_submit_urb(urb, GFP_ATOMIC);
 898                         if (result)
 899                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 900                         return;
 901                 }
 902                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 903                 return;
 904         }
 905
 906         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 907
 908         /* get tty_flag from status */
 909         tty_flag = TTY_NORMAL;
 910
 911         spin_lock_irqsave(&priv->lock, flags);
 912         status = priv->line_status;
 913         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 914         spin_unlock_irqrestore(&priv->lock, flags);
 915         wake_up_interruptible (&priv->delta_msr_wait);
 916
 917         /* break takes precedence over parity, */
 918         /* which takes precedence over framing errors */
 919         if (status & UART_BREAK_ERROR )
 920                 tty_flag = TTY_BREAK;
 921         else if (status & UART_PARITY_ERROR)
 922                 tty_flag = TTY_PARITY;
 923         else if (status & UART_FRAME_ERROR)
 924                 tty_flag = TTY_FRAME;
 925         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 926
 927         tty = port->tty;
 928         if (tty && urb->actual_length) {
 929                 tty_buffer_request_room(tty, urb->actual_length + 1);
 930                 /* overrun is special, not associated with a char */
 931                 if (status & UART_OVERRUN_ERROR)
 932                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 933                 for (i = 0; i < urb->actual_length; ++i)
 934                         tty_insert_flip_char (tty, data[i], tty_flag);
 935                 tty_flip_buffer_push (tty);
 936         }
 937
 938         /* Schedule the next read _if_ we are still open */
 939         if (port->open_count) {
 940                 urb->dev = port->serial->dev;
 941                 result = usb_submit_urb(urb, GFP_ATOMIC);
 942                 if (result)
 943                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 944         }
 945
 946         return;
 947 }
 948
 949
 950
 951 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 952 {
 953         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 954         struct pl2303_private *priv = usb_get_serial_port_data(port);
 955         int result;
 956
 957         dbg("%s - port %d", __FUNCTION__, port->number);
 958
 959         switch (urb->status) {
 960         case 0:
 961                 /* success */
 962                 break;
 963         case -ECONNRESET:
 964         case -ENOENT:
 965         case -ESHUTDOWN:
 966                 /* this urb is terminated, clean up */
 967                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 968                 priv->write_urb_in_use = 0;
 969                 return;
 970         default:
 971                 /* error in the urb, so we have to resubmit it */
 972                 dbg("%s - Overflow in write", __FUNCTION__);
 973                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 974                 port->write_urb->transfer_buffer_length = 1;
 975                 port->write_urb->dev = port->serial->dev;
 976                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 977                 if (result)
 978                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 979                 else
 980                         return;
 981         }
 982
 983         priv->write_urb_in_use = 0;
 984
 985         /* send any buffered data */
 986         pl2303_send(port);
 987 }
 988
 989
 990 /*
 991  * pl2303_buf_alloc
 992  *
 993  * Allocate a circular buffer and all associated memory.
 994  */
 995
 996 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
 997 {
 998
 999         struct pl2303_buf *pb;
1000
1001
1002         if (size == 0)
1003                 return NULL;
1004
1005         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1006         if (pb == NULL)
1007                 return NULL;
1008
1009         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1010         if (pb->buf_buf == NULL) {
1011                 kfree(pb);
1012                 return NULL;
1013         }
1014
1015         pb->buf_size = size;
1016         pb->buf_get = pb->buf_put = pb->buf_buf;
1017
1018         return pb;
1019
1020 }
1021
1022
1023 /*
1024  * pl2303_buf_free
1025  *
1026  * Free the buffer and all associated memory.
1027  */
1028
1029 static void pl2303_buf_free(struct pl2303_buf *pb)
1030 {
1031         if (pb) {
1032                 kfree(pb->buf_buf);
1033                 kfree(pb);
1034         }
1035 }
1036
1037
1038 /*
1039  * pl2303_buf_clear
1040  *
1041  * Clear out all data in the circular buffer.
1042  */
1043
1044 static void pl2303_buf_clear(struct pl2303_buf *pb)
1045 {
1046         if (pb != NULL)
1047                 pb->buf_get = pb->buf_put;
1048                 /* equivalent to a get of all data available */
1049 }
1050
1051
1052 /*
1053  * pl2303_buf_data_avail
1054  *
1055  * Return the number of bytes of data available in the circular
1056  * buffer.
1057  */
1058
1059 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1060 {
1061         if (pb != NULL)
1062                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1063         else
1064                 return 0;
1065 }
1066
1067
1068 /*
1069  * pl2303_buf_space_avail
1070  *
1071  * Return the number of bytes of space available in the circular
1072  * buffer.
1073  */
1074
1075 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1076 {
1077         if (pb != NULL)
1078                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1079         else
1080                 return 0;
1081 }
1082
1083
1084 /*
1085  * pl2303_buf_put
1086  *
1087  * Copy data data from a user buffer and put it into the circular buffer.
1088  * Restrict to the amount of space available.
1089  *
1090  * Return the number of bytes copied.
1091  */
1092
1093 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1094         unsigned int count)
1095 {
1096
1097         unsigned int len;
1098
1099
1100         if (pb == NULL)
1101                 return 0;
1102
1103         len  = pl2303_buf_space_avail(pb);
1104         if (count > len)
1105                 count = len;
1106
1107         if (count == 0)
1108                 return 0;
1109
1110         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1111         if (count > len) {
1112                 memcpy(pb->buf_put, buf, len);
1113                 memcpy(pb->buf_buf, buf+len, count - len);
1114                 pb->buf_put = pb->buf_buf + count - len;
1115         } else {
1116                 memcpy(pb->buf_put, buf, count);
1117                 if (count < len)
1118                         pb->buf_put += count;
1119                 else /* count == len */
1120                         pb->buf_put = pb->buf_buf;
1121         }
1122
1123         return count;
1124
1125 }
1126
1127
1128 /*
1129  * pl2303_buf_get
1130  *
1131  * Get data from the circular buffer and copy to the given buffer.
1132  * Restrict to the amount of data available.
1133  *
1134  * Return the number of bytes copied.
1135  */
1136
1137 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1138         unsigned int count)
1139 {
1140
1141         unsigned int len;
1142
1143
1144         if (pb == NULL)
1145                 return 0;
1146
1147         len = pl2303_buf_data_avail(pb);
1148         if (count > len)
1149                 count = len;
1150
1151         if (count == 0)
1152                 return 0;
1153
1154         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1155         if (count > len) {
1156                 memcpy(buf, pb->buf_get, len);
1157                 memcpy(buf+len, pb->buf_buf, count - len);
1158                 pb->buf_get = pb->buf_buf + count - len;
1159         } else {
1160                 memcpy(buf, pb->buf_get, count);
1161                 if (count < len)
1162                         pb->buf_get += count;
1163                 else /* count == len */
1164                         pb->buf_get = pb->buf_buf;
1165         }
1166
1167         return count;
1168
1169 }
1170
1171 static int __init pl2303_init (void)
1172 {
1173         int retval;
1174         retval = usb_serial_register(&pl2303_device);
1175         if (retval)
1176                 goto failed_usb_serial_register;
1177         retval = usb_register(&pl2303_driver);
1178         if (retval)
1179                 goto failed_usb_register;
1180         info(DRIVER_DESC);
1181         return 0;
1182 failed_usb_register:
1183         usb_serial_deregister(&pl2303_device);
1184 failed_usb_serial_register:
1185         return retval;
1186 }
1187
1188
1189 static void __exit pl2303_exit (void)
1190 {
1191         usb_deregister (&pl2303_driver);
1192         usb_serial_deregister (&pl2303_device);
1193 }
1194
1195
1196 module_init(pl2303_init);
1197 module_exit(pl2303_exit);
1198
1199 MODULE_DESCRIPTION(DRIVER_DESC);
1200 MODULE_LICENSE("GPL");
1201
1202 module_param(debug, bool, S_IRUGO | S_IWUSR);
1203 MODULE_PARM_DESC(debug, "Debug enabled or not");
1204