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(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  65         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  66         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  67         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  68         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  69         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  70         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  71         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  72         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  74         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  75         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  76         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  77         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  78         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  79         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  80         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  81         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  82         { USB_DEVICE(OTI_VENDOR_ID, OTI_PRODUCT_ID) },
  83         { }                                     /* Terminating entry */
  84 };
  85
  86 MODULE_DEVICE_TABLE (usb, id_table);
  87
  88 static struct usb_driver pl2303_driver = {
  89         .name =         "pl2303",
  90         .probe =        usb_serial_probe,
  91         .disconnect =   usb_serial_disconnect,
  92         .id_table =     id_table,
  93         .no_dynamic_id =        1,
  94 };
  95
  96 #define SET_LINE_REQUEST_TYPE           0x21
  97 #define SET_LINE_REQUEST                0x20
  98
  99 #define SET_CONTROL_REQUEST_TYPE        0x21
 100 #define SET_CONTROL_REQUEST             0x22
 101 #define CONTROL_DTR                     0x01
 102 #define CONTROL_RTS                     0x02
 103
 104 #define BREAK_REQUEST_TYPE              0x21
 105 #define BREAK_REQUEST                   0x23
 106 #define BREAK_ON                        0xffff
 107 #define BREAK_OFF                       0x0000
 108
 109 #define GET_LINE_REQUEST_TYPE           0xa1
 110 #define GET_LINE_REQUEST                0x21
 111
 112 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 113 #define VENDOR_WRITE_REQUEST            0x01
 114
 115 #define VENDOR_READ_REQUEST_TYPE        0xc0
 116 #define VENDOR_READ_REQUEST             0x01
 117
 118 #define UART_STATE                      0x08
 119 #define UART_STATE_TRANSIENT_MASK       0x74
 120 #define UART_DCD                        0x01
 121 #define UART_DSR                        0x02
 122 #define UART_BREAK_ERROR                0x04
 123 #define UART_RING                       0x08
 124 #define UART_FRAME_ERROR                0x10
 125 #define UART_PARITY_ERROR               0x20
 126 #define UART_OVERRUN_ERROR              0x40
 127 #define UART_CTS                        0x80
 128
 129 /* function prototypes for a PL2303 serial converter */
 130 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 131 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 132 static void pl2303_set_termios (struct usb_serial_port *port,
 133                                 struct termios *old);
 134 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 135                          unsigned int cmd, unsigned long arg);
 136 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 137 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 138 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 139 static int pl2303_write (struct usb_serial_port *port,
 140                          const unsigned char *buf, int count);
 141 static void pl2303_send (struct usb_serial_port *port);
 142 static int pl2303_write_room(struct usb_serial_port *port);
 143 static int pl2303_chars_in_buffer(struct usb_serial_port *port);
 144 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 145 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 146 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 147                             unsigned int set, unsigned int clear);
 148 static int pl2303_startup (struct usb_serial *serial);
 149 static void pl2303_shutdown (struct usb_serial *serial);
 150 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
 151 static void pl2303_buf_free(struct pl2303_buf *pb);
 152 static void pl2303_buf_clear(struct pl2303_buf *pb);
 153 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
 154 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
 155 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
 156         unsigned int count);
 157 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
 158         unsigned int count);
 159
 160
 161 /* All of the device info needed for the PL2303 SIO serial converter */
 162 static struct usb_serial_driver pl2303_device = {
 163         .driver = {
 164                 .owner =        THIS_MODULE,
 165                 .name =         "pl2303",
 166         },
 167         .id_table =             id_table,
 168         .num_interrupt_in =     NUM_DONT_CARE,
 169         .num_bulk_in =          1,
 170         .num_bulk_out =         1,
 171         .num_ports =            1,
 172         .open =                 pl2303_open,
 173         .close =                pl2303_close,
 174         .write =                pl2303_write,
 175         .ioctl =                pl2303_ioctl,
 176         .break_ctl =            pl2303_break_ctl,
 177         .set_termios =          pl2303_set_termios,
 178         .tiocmget =             pl2303_tiocmget,
 179         .tiocmset =             pl2303_tiocmset,
 180         .read_bulk_callback =   pl2303_read_bulk_callback,
 181         .read_int_callback =    pl2303_read_int_callback,
 182         .write_bulk_callback =  pl2303_write_bulk_callback,
 183         .write_room =           pl2303_write_room,
 184         .chars_in_buffer =      pl2303_chars_in_buffer,
 185         .attach =               pl2303_startup,
 186         .shutdown =             pl2303_shutdown,
 187 };
 188
 189 enum pl2303_type {
 190         type_0,         /* don't know the difference between type 0 and */
 191         type_1,         /* type 1, until someone from prolific tells us... */
 192         HX,             /* HX version of the pl2303 chip */
 193 };
 194
 195 struct pl2303_private {
 196         spinlock_t lock;
 197         struct pl2303_buf *buf;
 198         int write_urb_in_use;
 199         wait_queue_head_t delta_msr_wait;
 200         u8 line_control;
 201         u8 line_status;
 202         u8 termios_initialized;
 203         enum pl2303_type type;
 204 };
 205
 206
 207 static int pl2303_startup (struct usb_serial *serial)
 208 {
 209         struct pl2303_private *priv;
 210         enum pl2303_type type = type_0;
 211         int i;
 212
 213         if (serial->dev->descriptor.bDeviceClass == 0x02)
 214                 type = type_0;
 215         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 216                 type = HX;
 217         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 218                 type = type_1;
 219         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 220                 type = type_1;
 221         dbg("device type: %d", type);
 222
 223         for (i = 0; i < serial->num_ports; ++i) {
 224                 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
 225                 if (!priv)
 226                         goto cleanup;
 227                 spin_lock_init(&priv->lock);
 228                 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
 229                 if (priv->buf == NULL) {
 230                         kfree(priv);
 231                         goto cleanup;
 232                 }
 233                 init_waitqueue_head(&priv->delta_msr_wait);
 234                 priv->type = type;
 235                 usb_set_serial_port_data(serial->port[i], priv);
 236         }
 237         return 0;
 238
 239 cleanup:
 240         for (--i; i>=0; --i) {
 241                 priv = usb_get_serial_port_data(serial->port[i]);
 242                 pl2303_buf_free(priv->buf);
 243                 kfree(priv);
 244                 usb_set_serial_port_data(serial->port[i], NULL);
 245         }
 246         return -ENOMEM;
 247 }
 248
 249 static int set_control_lines (struct usb_device *dev, u8 value)
 250 {
 251         int retval;
 252
 253         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 254                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 255                                   value, 0, NULL, 0, 100);
 256         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 257         return retval;
 258 }
 259
 260 static int pl2303_write (struct usb_serial_port *port,  const unsigned char *buf, int count)
 261 {
 262         struct pl2303_private *priv = usb_get_serial_port_data(port);
 263         unsigned long flags;
 264
 265         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 266
 267         if (!count)
 268                 return count;
 269
 270         spin_lock_irqsave(&priv->lock, flags);
 271         count = pl2303_buf_put(priv->buf, buf, count);
 272         spin_unlock_irqrestore(&priv->lock, flags);
 273
 274         pl2303_send(port);
 275
 276         return count;
 277 }
 278
 279 static void pl2303_send(struct usb_serial_port *port)
 280 {
 281         int count, result;
 282         struct pl2303_private *priv = usb_get_serial_port_data(port);
 283         unsigned long flags;
 284
 285         dbg("%s - port %d", __FUNCTION__, port->number);
 286
 287         spin_lock_irqsave(&priv->lock, flags);
 288
 289         if (priv->write_urb_in_use) {
 290                 spin_unlock_irqrestore(&priv->lock, flags);
 291                 return;
 292         }
 293
 294         count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
 295                 port->bulk_out_size);
 296
 297         if (count == 0) {
 298                 spin_unlock_irqrestore(&priv->lock, flags);
 299                 return;
 300         }
 301
 302         priv->write_urb_in_use = 1;
 303
 304         spin_unlock_irqrestore(&priv->lock, flags);
 305
 306         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 307
 308         port->write_urb->transfer_buffer_length = count;
 309         port->write_urb->dev = port->serial->dev;
 310         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 311         if (result) {
 312                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 313                 priv->write_urb_in_use = 0;
 314                 // TODO: reschedule pl2303_send
 315         }
 316
 317         schedule_work(&port->work);
 318 }
 319
 320 static int pl2303_write_room(struct usb_serial_port *port)
 321 {
 322         struct pl2303_private *priv = usb_get_serial_port_data(port);
 323         int room = 0;
 324         unsigned long flags;
 325
 326         dbg("%s - port %d", __FUNCTION__, port->number);
 327
 328         spin_lock_irqsave(&priv->lock, flags);
 329         room = pl2303_buf_space_avail(priv->buf);
 330         spin_unlock_irqrestore(&priv->lock, flags);
 331
 332         dbg("%s - returns %d", __FUNCTION__, room);
 333         return room;
 334 }
 335
 336 static int pl2303_chars_in_buffer(struct usb_serial_port *port)
 337 {
 338         struct pl2303_private *priv = usb_get_serial_port_data(port);
 339         int chars = 0;
 340         unsigned long flags;
 341
 342         dbg("%s - port %d", __FUNCTION__, port->number);
 343
 344         spin_lock_irqsave(&priv->lock, flags);
 345         chars = pl2303_buf_data_avail(priv->buf);
 346         spin_unlock_irqrestore(&priv->lock, flags);
 347
 348         dbg("%s - returns %d", __FUNCTION__, chars);
 349         return chars;
 350 }
 351
 352 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 353 {
 354         struct usb_serial *serial = port->serial;
 355         struct pl2303_private *priv = usb_get_serial_port_data(port);
 356         unsigned long flags;
 357         unsigned int cflag;
 358         unsigned char *buf;
 359         int baud;
 360         int i;
 361         u8 control;
 362
 363         dbg("%s -  port %d", __FUNCTION__, port->number);
 364
 365         if ((!port->tty) || (!port->tty->termios)) {
 366                 dbg("%s - no tty structures", __FUNCTION__);
 367                 return;
 368         }
 369
 370         spin_lock_irqsave(&priv->lock, flags);
 371         if (!priv->termios_initialized) {
 372                 *(port->tty->termios) = tty_std_termios;
 373                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 374                 priv->termios_initialized = 1;
 375         }
 376         spin_unlock_irqrestore(&priv->lock, flags);
 377
 378         cflag = port->tty->termios->c_cflag;
 379         /* check that they really want us to change something */
 380         if (old_termios) {
 381                 if ((cflag == old_termios->c_cflag) &&
 382                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 383                     dbg("%s - nothing to change...", __FUNCTION__);
 384                     return;
 385                 }
 386         }
 387
 388         buf = kzalloc (7, GFP_KERNEL);
 389         if (!buf) {
 390                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 391                 return;
 392         }
 393
 394         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 395                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 396                              0, 0, buf, 7, 100);
 397         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 398              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 399
 400
 401         if (cflag & CSIZE) {
 402                 switch (cflag & CSIZE) {
 403                         case CS5:       buf[6] = 5;     break;
 404                         case CS6:       buf[6] = 6;     break;
 405                         case CS7:       buf[6] = 7;     break;
 406                         default:
 407                         case CS8:       buf[6] = 8;     break;
 408                 }
 409                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 410         }
 411
 412         baud = 0;
 413         switch (cflag & CBAUD) {
 414                 case B0:        baud = 0;       break;
 415                 case B75:       baud = 75;      break;
 416                 case B150:      baud = 150;     break;
 417                 case B300:      baud = 300;     break;
 418                 case B600:      baud = 600;     break;
 419                 case B1200:     baud = 1200;    break;
 420                 case B1800:     baud = 1800;    break;
 421                 case B2400:     baud = 2400;    break;
 422                 case B4800:     baud = 4800;    break;
 423                 case B9600:     baud = 9600;    break;
 424                 case B19200:    baud = 19200;   break;
 425                 case B38400:    baud = 38400;   break;
 426                 case B57600:    baud = 57600;   break;
 427                 case B115200:   baud = 115200;  break;
 428                 case B230400:   baud = 230400;  break;
 429                 case B460800:   baud = 460800;  break;
 430                 default:
 431                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 432                         break;
 433         }
 434         dbg("%s - baud = %d", __FUNCTION__, baud);
 435         if (baud) {
 436                 buf[0] = baud & 0xff;
 437                 buf[1] = (baud >> 8) & 0xff;
 438                 buf[2] = (baud >> 16) & 0xff;
 439                 buf[3] = (baud >> 24) & 0xff;
 440         }
 441
 442         /* For reference buf[4]=0 is 1 stop bits */
 443         /* For reference buf[4]=1 is 1.5 stop bits */
 444         /* For reference buf[4]=2 is 2 stop bits */
 445         if (cflag & CSTOPB) {
 446                 buf[4] = 2;
 447                 dbg("%s - stop bits = 2", __FUNCTION__);
 448         } else {
 449                 buf[4] = 0;
 450                 dbg("%s - stop bits = 1", __FUNCTION__);
 451         }
 452
 453         if (cflag & PARENB) {
 454                 /* For reference buf[5]=0 is none parity */
 455                 /* For reference buf[5]=1 is odd parity */
 456                 /* For reference buf[5]=2 is even parity */
 457                 /* For reference buf[5]=3 is mark parity */
 458                 /* For reference buf[5]=4 is space parity */
 459                 if (cflag & PARODD) {
 460                         buf[5] = 1;
 461                         dbg("%s - parity = odd", __FUNCTION__);
 462                 } else {
 463                         buf[5] = 2;
 464                         dbg("%s - parity = even", __FUNCTION__);
 465                 }
 466         } else {
 467                 buf[5] = 0;
 468                 dbg("%s - parity = none", __FUNCTION__);
 469         }
 470
 471         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 472                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 473                              0, 0, buf, 7, 100);
 474         dbg ("0x21:0x20:0:0  %d", i);
 475
 476         /* change control lines if we are switching to or from B0 */
 477         spin_lock_irqsave(&priv->lock, flags);
 478         control = priv->line_control;
 479         if ((cflag & CBAUD) == B0)
 480                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 481         else
 482                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 483         if (control != priv->line_control) {
 484                 control = priv->line_control;
 485                 spin_unlock_irqrestore(&priv->lock, flags);
 486                 set_control_lines(serial->dev, control);
 487         } else {
 488                 spin_unlock_irqrestore(&priv->lock, flags);
 489         }
 490
 491         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 492
 493         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 494                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 495                              0, 0, buf, 7, 100);
 496         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 497              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 498
 499         if (cflag & CRTSCTS) {
 500                 __u16 index;
 501                 if (priv->type == HX)
 502                         index = 0x61;
 503                 else
 504                         index = 0x41;
 505                 i = usb_control_msg(serial->dev,
 506                                     usb_sndctrlpipe(serial->dev, 0),
 507                                     VENDOR_WRITE_REQUEST,
 508                                     VENDOR_WRITE_REQUEST_TYPE,
 509                                     0x0, index, NULL, 0, 100);
 510                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 511         }
 512
 513         kfree (buf);
 514 }
 515
 516 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 517 {
 518         struct termios tmp_termios;
 519         struct usb_serial *serial = port->serial;
 520         struct pl2303_private *priv = usb_get_serial_port_data(port);
 521         unsigned char *buf;
 522         int result;
 523
 524         dbg("%s -  port %d", __FUNCTION__, port->number);
 525
 526         if (priv->type != HX) {
 527                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 528                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 529         }
 530
 531         buf = kmalloc(10, GFP_KERNEL);
 532         if (buf==NULL)
 533                 return -ENOMEM;
 534
 535 #define FISH(a,b,c,d)                                                           \
 536         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 537                                b, a, c, d, buf, 1, 100);                        \
 538         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 539
 540 #define SOUP(a,b,c,d)                                                           \
 541         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 542                                b, a, c, d, NULL, 0, 100);                       \
 543         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 544
 545         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 546         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 547         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 548         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 549         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 550         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 551         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 552         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 553         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 554         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 555
 556         if (priv->type == HX) {
 557                 /* HX chip */
 558                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 559                 /* reset upstream data pipes */
 560                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 561                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 562         } else {
 563                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 564         }
 565
 566         kfree(buf);
 567
 568         /* Setup termios */
 569         if (port->tty) {
 570                 pl2303_set_termios (port, &tmp_termios);
 571         }
 572
 573         //FIXME: need to assert RTS and DTR if CRTSCTS off
 574
 575         dbg("%s - submitting read urb", __FUNCTION__);
 576         port->read_urb->dev = serial->dev;
 577         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 578         if (result) {
 579                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 580                 pl2303_close (port, NULL);
 581                 return -EPROTO;
 582         }
 583
 584         dbg("%s - submitting interrupt urb", __FUNCTION__);
 585         port->interrupt_in_urb->dev = serial->dev;
 586         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 587         if (result) {
 588                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 589                 pl2303_close (port, NULL);
 590                 return -EPROTO;
 591         }
 592         return 0;
 593 }
 594
 595
 596 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 597 {
 598         struct pl2303_private *priv = usb_get_serial_port_data(port);
 599         unsigned long flags;
 600         unsigned int c_cflag;
 601         int bps;
 602         long timeout;
 603         wait_queue_t wait;                                              \
 604
 605         dbg("%s - port %d", __FUNCTION__, port->number);
 606
 607         /* wait for data to drain from the buffer */
 608         spin_lock_irqsave(&priv->lock, flags);
 609         timeout = PL2303_CLOSING_WAIT;
 610         init_waitqueue_entry(&wait, current);
 611         add_wait_queue(&port->tty->write_wait, &wait);
 612         for (;;) {
 613                 set_current_state(TASK_INTERRUPTIBLE);
 614                 if (pl2303_buf_data_avail(priv->buf) == 0
 615                 || timeout == 0 || signal_pending(current)
 616                 || !usb_get_intfdata(port->serial->interface))  /* disconnect */
 617                         break;
 618                 spin_unlock_irqrestore(&priv->lock, flags);
 619                 timeout = schedule_timeout(timeout);
 620                 spin_lock_irqsave(&priv->lock, flags);
 621         }
 622         set_current_state(TASK_RUNNING);
 623         remove_wait_queue(&port->tty->write_wait, &wait);
 624         /* clear out any remaining data in the buffer */
 625         pl2303_buf_clear(priv->buf);
 626         spin_unlock_irqrestore(&priv->lock, flags);
 627
 628         /* wait for characters to drain from the device */
 629         /* (this is long enough for the entire 256 byte */
 630         /* pl2303 hardware buffer to drain with no flow */
 631         /* control for data rates of 1200 bps or more, */
 632         /* for lower rates we should really know how much */
 633         /* data is in the buffer to compute a delay */
 634         /* that is not unnecessarily long) */
 635         bps = tty_get_baud_rate(port->tty);
 636         if (bps > 1200)
 637                 timeout = max((HZ*2560)/bps,HZ/10);
 638         else
 639                 timeout = 2*HZ;
 640         schedule_timeout_interruptible(timeout);
 641
 642         /* shutdown our urbs */
 643         dbg("%s - shutting down urbs", __FUNCTION__);
 644         usb_kill_urb(port->write_urb);
 645         usb_kill_urb(port->read_urb);
 646         usb_kill_urb(port->interrupt_in_urb);
 647
 648         if (port->tty) {
 649                 c_cflag = port->tty->termios->c_cflag;
 650                 if (c_cflag & HUPCL) {
 651                         /* drop DTR and RTS */
 652                         spin_lock_irqsave(&priv->lock, flags);
 653                         priv->line_control = 0;
 654                         spin_unlock_irqrestore (&priv->lock, flags);
 655                         set_control_lines (port->serial->dev, 0);
 656                 }
 657         }
 658 }
 659
 660 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 661                             unsigned int set, unsigned int clear)
 662 {
 663         struct pl2303_private *priv = usb_get_serial_port_data(port);
 664         unsigned long flags;
 665         u8 control;
 666
 667         if (!usb_get_intfdata(port->serial->interface))
 668                 return -ENODEV;
 669
 670         spin_lock_irqsave (&priv->lock, flags);
 671         if (set & TIOCM_RTS)
 672                 priv->line_control |= CONTROL_RTS;
 673         if (set & TIOCM_DTR)
 674                 priv->line_control |= CONTROL_DTR;
 675         if (clear & TIOCM_RTS)
 676                 priv->line_control &= ~CONTROL_RTS;
 677         if (clear & TIOCM_DTR)
 678                 priv->line_control &= ~CONTROL_DTR;
 679         control = priv->line_control;
 680         spin_unlock_irqrestore (&priv->lock, flags);
 681
 682         return set_control_lines (port->serial->dev, control);
 683 }
 684
 685 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 686 {
 687         struct pl2303_private *priv = usb_get_serial_port_data(port);
 688         unsigned long flags;
 689         unsigned int mcr;
 690         unsigned int status;
 691         unsigned int result;
 692
 693         dbg("%s (%d)", __FUNCTION__, port->number);
 694
 695         if (!usb_get_intfdata(port->serial->interface))
 696                 return -ENODEV;
 697
 698         spin_lock_irqsave (&priv->lock, flags);
 699         mcr = priv->line_control;
 700         status = priv->line_status;
 701         spin_unlock_irqrestore (&priv->lock, flags);
 702
 703         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 704                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 705                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 706                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 707                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 708                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 709
 710         dbg("%s - result = %x", __FUNCTION__, result);
 711
 712         return result;
 713 }
 714
 715 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 716 {
 717         struct pl2303_private *priv = usb_get_serial_port_data(port);
 718         unsigned long flags;
 719         unsigned int prevstatus;
 720         unsigned int status;
 721         unsigned int changed;
 722
 723         spin_lock_irqsave (&priv->lock, flags);
 724         prevstatus = priv->line_status;
 725         spin_unlock_irqrestore (&priv->lock, flags);
 726
 727         while (1) {
 728                 interruptible_sleep_on(&priv->delta_msr_wait);
 729                 /* see if a signal did it */
 730                 if (signal_pending(current))
 731                         return -ERESTARTSYS;
 732
 733                 spin_lock_irqsave (&priv->lock, flags);
 734                 status = priv->line_status;
 735                 spin_unlock_irqrestore (&priv->lock, flags);
 736
 737                 changed=prevstatus^status;
 738
 739                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 740                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 741                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 742                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 743                         return 0;
 744                 }
 745                 prevstatus = status;
 746         }
 747         /* NOTREACHED */
 748         return 0;
 749 }
 750
 751 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 752 {
 753         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 754
 755         switch (cmd) {
 756                 case TIOCMIWAIT:
 757                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 758                         return wait_modem_info(port, arg);
 759
 760                 default:
 761                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 762                         break;
 763         }
 764
 765         return -ENOIOCTLCMD;
 766 }
 767
 768 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 769 {
 770         struct usb_serial *serial = port->serial;
 771         u16 state;
 772         int result;
 773
 774         dbg("%s - port %d", __FUNCTION__, port->number);
 775
 776         if (break_state == 0)
 777                 state = BREAK_OFF;
 778         else
 779                 state = BREAK_ON;
 780         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 781
 782         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 783                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 784                                   0, NULL, 0, 100);
 785         if (result)
 786                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 787 }
 788
 789
 790 static void pl2303_shutdown (struct usb_serial *serial)
 791 {
 792         int i;
 793         struct pl2303_private *priv;
 794
 795         dbg("%s", __FUNCTION__);
 796
 797         for (i = 0; i < serial->num_ports; ++i) {
 798                 priv = usb_get_serial_port_data(serial->port[i]);
 799                 if (priv) {
 800                         pl2303_buf_free(priv->buf);
 801                         kfree(priv);
 802                         usb_set_serial_port_data(serial->port[i], NULL);
 803                 }
 804         }
 805 }
 806
 807 static void pl2303_update_line_status(struct usb_serial_port *port,
 808                                       unsigned char *data,
 809                                       unsigned int actual_length)
 810 {
 811
 812         struct pl2303_private *priv = usb_get_serial_port_data(port);
 813         unsigned long flags;
 814         u8 status_idx = UART_STATE;
 815         u8 length = UART_STATE + 1;
 816
 817         if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
 818             (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
 819              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
 820              le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
 821                 length = 1;
 822                 status_idx = 0;
 823         }
 824
 825         if (actual_length < length)
 826                 goto exit;
 827
 828         /* Save off the uart status for others to look at */
 829         spin_lock_irqsave(&priv->lock, flags);
 830         priv->line_status = data[status_idx];
 831         spin_unlock_irqrestore(&priv->lock, flags);
 832         wake_up_interruptible (&priv->delta_msr_wait);
 833
 834 exit:
 835         return;
 836 }
 837
 838 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 839 {
 840         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 841         unsigned char *data = urb->transfer_buffer;
 842         unsigned int actual_length = urb->actual_length;
 843         int status;
 844
 845         dbg("%s (%d)", __FUNCTION__, port->number);
 846
 847         switch (urb->status) {
 848         case 0:
 849                 /* success */
 850                 break;
 851         case -ECONNRESET:
 852         case -ENOENT:
 853         case -ESHUTDOWN:
 854                 /* this urb is terminated, clean up */
 855                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 856                 return;
 857         default:
 858                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 859                 goto exit;
 860         }
 861
 862         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 863         pl2303_update_line_status(port, data, actual_length);
 864
 865 exit:
 866         status = usb_submit_urb (urb, GFP_ATOMIC);
 867         if (status)
 868                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 869                         __FUNCTION__, status);
 870 }
 871
 872
 873 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 874 {
 875         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 876         struct pl2303_private *priv = usb_get_serial_port_data(port);
 877         struct tty_struct *tty;
 878         unsigned char *data = urb->transfer_buffer;
 879         unsigned long flags;
 880         int i;
 881         int result;
 882         u8 status;
 883         char tty_flag;
 884
 885         dbg("%s - port %d", __FUNCTION__, port->number);
 886
 887         if (urb->status) {
 888                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 889                 if (!port->open_count) {
 890                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 891                         return;
 892                 }
 893                 if (urb->status == -EPROTO) {
 894                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 895                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 896                         urb->status = 0;
 897                         urb->dev = port->serial->dev;
 898                         result = usb_submit_urb(urb, GFP_ATOMIC);
 899                         if (result)
 900                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 901                         return;
 902                 }
 903                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 904                 return;
 905         }
 906
 907         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 908
 909         /* get tty_flag from status */
 910         tty_flag = TTY_NORMAL;
 911
 912         spin_lock_irqsave(&priv->lock, flags);
 913         status = priv->line_status;
 914         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 915         spin_unlock_irqrestore(&priv->lock, flags);
 916         wake_up_interruptible (&priv->delta_msr_wait);
 917
 918         /* break takes precedence over parity, */
 919         /* which takes precedence over framing errors */
 920         if (status & UART_BREAK_ERROR )
 921                 tty_flag = TTY_BREAK;
 922         else if (status & UART_PARITY_ERROR)
 923                 tty_flag = TTY_PARITY;
 924         else if (status & UART_FRAME_ERROR)
 925                 tty_flag = TTY_FRAME;
 926         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 927
 928         tty = port->tty;
 929         if (tty && urb->actual_length) {
 930                 tty_buffer_request_room(tty, urb->actual_length + 1);
 931                 /* overrun is special, not associated with a char */
 932                 if (status & UART_OVERRUN_ERROR)
 933                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 934                 for (i = 0; i < urb->actual_length; ++i)
 935                         tty_insert_flip_char (tty, data[i], tty_flag);
 936                 tty_flip_buffer_push (tty);
 937         }
 938
 939         /* Schedule the next read _if_ we are still open */
 940         if (port->open_count) {
 941                 urb->dev = port->serial->dev;
 942                 result = usb_submit_urb(urb, GFP_ATOMIC);
 943                 if (result)
 944                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 945         }
 946
 947         return;
 948 }
 949
 950
 951
 952 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 953 {
 954         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 955         struct pl2303_private *priv = usb_get_serial_port_data(port);
 956         int result;
 957
 958         dbg("%s - port %d", __FUNCTION__, port->number);
 959
 960         switch (urb->status) {
 961         case 0:
 962                 /* success */
 963                 break;
 964         case -ECONNRESET:
 965         case -ENOENT:
 966         case -ESHUTDOWN:
 967                 /* this urb is terminated, clean up */
 968                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 969                 priv->write_urb_in_use = 0;
 970                 return;
 971         default:
 972                 /* error in the urb, so we have to resubmit it */
 973                 dbg("%s - Overflow in write", __FUNCTION__);
 974                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 975                 port->write_urb->transfer_buffer_length = 1;
 976                 port->write_urb->dev = port->serial->dev;
 977                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 978                 if (result)
 979                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 980                 else
 981                         return;
 982         }
 983
 984         priv->write_urb_in_use = 0;
 985
 986         /* send any buffered data */
 987         pl2303_send(port);
 988 }
 989
 990
 991 /*
 992  * pl2303_buf_alloc
 993  *
 994  * Allocate a circular buffer and all associated memory.
 995  */
 996
 997 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
 998 {
 999
1000         struct pl2303_buf *pb;
1001
1002
1003         if (size == 0)
1004                 return NULL;
1005
1006         pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1007         if (pb == NULL)
1008                 return NULL;
1009
1010         pb->buf_buf = kmalloc(size, GFP_KERNEL);
1011         if (pb->buf_buf == NULL) {
1012                 kfree(pb);
1013                 return NULL;
1014         }
1015
1016         pb->buf_size = size;
1017         pb->buf_get = pb->buf_put = pb->buf_buf;
1018
1019         return pb;
1020
1021 }
1022
1023
1024 /*
1025  * pl2303_buf_free
1026  *
1027  * Free the buffer and all associated memory.
1028  */
1029
1030 static void pl2303_buf_free(struct pl2303_buf *pb)
1031 {
1032         if (pb) {
1033                 kfree(pb->buf_buf);
1034                 kfree(pb);
1035         }
1036 }
1037
1038
1039 /*
1040  * pl2303_buf_clear
1041  *
1042  * Clear out all data in the circular buffer.
1043  */
1044
1045 static void pl2303_buf_clear(struct pl2303_buf *pb)
1046 {
1047         if (pb != NULL)
1048                 pb->buf_get = pb->buf_put;
1049                 /* equivalent to a get of all data available */
1050 }
1051
1052
1053 /*
1054  * pl2303_buf_data_avail
1055  *
1056  * Return the number of bytes of data available in the circular
1057  * buffer.
1058  */
1059
1060 static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1061 {
1062         if (pb != NULL)
1063                 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1064         else
1065                 return 0;
1066 }
1067
1068
1069 /*
1070  * pl2303_buf_space_avail
1071  *
1072  * Return the number of bytes of space available in the circular
1073  * buffer.
1074  */
1075
1076 static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1077 {
1078         if (pb != NULL)
1079                 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1080         else
1081                 return 0;
1082 }
1083
1084
1085 /*
1086  * pl2303_buf_put
1087  *
1088  * Copy data data from a user buffer and put it into the circular buffer.
1089  * Restrict to the amount of space available.
1090  *
1091  * Return the number of bytes copied.
1092  */
1093
1094 static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1095         unsigned int count)
1096 {
1097
1098         unsigned int len;
1099
1100
1101         if (pb == NULL)
1102                 return 0;
1103
1104         len  = pl2303_buf_space_avail(pb);
1105         if (count > len)
1106                 count = len;
1107
1108         if (count == 0)
1109                 return 0;
1110
1111         len = pb->buf_buf + pb->buf_size - pb->buf_put;
1112         if (count > len) {
1113                 memcpy(pb->buf_put, buf, len);
1114                 memcpy(pb->buf_buf, buf+len, count - len);
1115                 pb->buf_put = pb->buf_buf + count - len;
1116         } else {
1117                 memcpy(pb->buf_put, buf, count);
1118                 if (count < len)
1119                         pb->buf_put += count;
1120                 else /* count == len */
1121                         pb->buf_put = pb->buf_buf;
1122         }
1123
1124         return count;
1125
1126 }
1127
1128
1129 /*
1130  * pl2303_buf_get
1131  *
1132  * Get data from the circular buffer and copy to the given buffer.
1133  * Restrict to the amount of data available.
1134  *
1135  * Return the number of bytes copied.
1136  */
1137
1138 static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1139         unsigned int count)
1140 {
1141
1142         unsigned int len;
1143
1144
1145         if (pb == NULL)
1146                 return 0;
1147
1148         len = pl2303_buf_data_avail(pb);
1149         if (count > len)
1150                 count = len;
1151
1152         if (count == 0)
1153                 return 0;
1154
1155         len = pb->buf_buf + pb->buf_size - pb->buf_get;
1156         if (count > len) {
1157                 memcpy(buf, pb->buf_get, len);
1158                 memcpy(buf+len, pb->buf_buf, count - len);
1159                 pb->buf_get = pb->buf_buf + count - len;
1160         } else {
1161                 memcpy(buf, pb->buf_get, count);
1162                 if (count < len)
1163                         pb->buf_get += count;
1164                 else /* count == len */
1165                         pb->buf_get = pb->buf_buf;
1166         }
1167
1168         return count;
1169
1170 }
1171
1172 static int __init pl2303_init (void)
1173 {
1174         int retval;
1175         retval = usb_serial_register(&pl2303_device);
1176         if (retval)
1177                 goto failed_usb_serial_register;
1178         retval = usb_register(&pl2303_driver);
1179         if (retval)
1180                 goto failed_usb_register;
1181         info(DRIVER_DESC);
1182         return 0;
1183 failed_usb_register:
1184         usb_serial_deregister(&pl2303_device);
1185 failed_usb_serial_register:
1186         return retval;
1187 }
1188
1189
1190 static void __exit pl2303_exit (void)
1191 {
1192         usb_deregister (&pl2303_driver);
1193         usb_serial_deregister (&pl2303_device);
1194 }
1195
1196
1197 module_init(pl2303_init);
1198 module_exit(pl2303_exit);
1199
1200 MODULE_DESCRIPTION(DRIVER_DESC);
1201 MODULE_LICENSE("GPL");
1202
1203 module_param(debug, bool, S_IRUGO | S_IWUSR);
1204 MODULE_PARM_DESC(debug, "Debug enabled or not");
1205