drivers/usb/serial/cp2101.c

   1 /*
   2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  * Outstanding Issues:
  15  *  Buffers are not flushed when the port is opened.
  16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/usb.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/usb/serial.h>
  30
  31 /*
  32  * Version Information
  33  */
  34 #define DRIVER_VERSION "v0.07"
  35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  36
  37 /*
  38  * Function Prototypes
  39  */
  40 static int cp2101_open(struct usb_serial_port*, struct file*);
  41 static void cp2101_cleanup(struct usb_serial_port*);
  42 static void cp2101_close(struct usb_serial_port*, struct file*);
  43 static void cp2101_get_termios(struct usb_serial_port*);
  44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
  45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  47                 unsigned int, unsigned int);
  48 static void cp2101_break_ctl(struct usb_serial_port*, int);
  49 static int cp2101_startup (struct usb_serial *);
  50 static void cp2101_shutdown(struct usb_serial*);
  51
  52
  53 static int debug;
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  58         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  59         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  60         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  61         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  62         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  63         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  64         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  65         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  66         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  67         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  68         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  69         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  70         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  71         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  72         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  73         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  74         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  75         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  76         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  77         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  78         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  79         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  80         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  81         { } /* Terminating Entry */
  82 };
  83
  84 MODULE_DEVICE_TABLE (usb, id_table);
  85
  86 static struct usb_driver cp2101_driver = {
  87         .name           = "cp2101",
  88         .probe          = usb_serial_probe,
  89         .disconnect     = usb_serial_disconnect,
  90         .id_table       = id_table,
  91         .no_dynamic_id  =       1,
  92 };
  93
  94 static struct usb_serial_driver cp2101_device = {
  95         .driver = {
  96                 .owner =        THIS_MODULE,
  97                 .name =         "cp2101",
  98         },
  99         .usb_driver             = &cp2101_driver,
 100         .id_table               = id_table,
 101         .num_interrupt_in       = 0,
 102         .num_bulk_in            = NUM_DONT_CARE,
 103         .num_bulk_out           = NUM_DONT_CARE,
 104         .num_ports              = 1,
 105         .open                   = cp2101_open,
 106         .close                  = cp2101_close,
 107         .break_ctl              = cp2101_break_ctl,
 108         .set_termios            = cp2101_set_termios,
 109         .tiocmget               = cp2101_tiocmget,
 110         .tiocmset               = cp2101_tiocmset,
 111         .attach                 = cp2101_startup,
 112         .shutdown               = cp2101_shutdown,
 113 };
 114
 115 /* Config request types */
 116 #define REQTYPE_HOST_TO_DEVICE  0x41
 117 #define REQTYPE_DEVICE_TO_HOST  0xc1
 118
 119 /* Config SET requests. To GET, add 1 to the request number */
 120 #define CP2101_UART             0x00    /* Enable / Disable */
 121 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 122 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 123 #define CP2101_BREAK            0x05    /* On / Off */
 124 #define CP2101_CONTROL          0x07    /* Flow control line states */
 125 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 126 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 127
 128 /* CP2101_UART */
 129 #define UART_ENABLE             0x0001
 130 #define UART_DISABLE            0x0000
 131
 132 /* CP2101_BAUDRATE */
 133 #define BAUD_RATE_GEN_FREQ      0x384000
 134
 135 /* CP2101_BITS */
 136 #define BITS_DATA_MASK          0X0f00
 137 #define BITS_DATA_5             0X0500
 138 #define BITS_DATA_6             0X0600
 139 #define BITS_DATA_7             0X0700
 140 #define BITS_DATA_8             0X0800
 141 #define BITS_DATA_9             0X0900
 142
 143 #define BITS_PARITY_MASK        0x00f0
 144 #define BITS_PARITY_NONE        0x0000
 145 #define BITS_PARITY_ODD         0x0010
 146 #define BITS_PARITY_EVEN        0x0020
 147 #define BITS_PARITY_MARK        0x0030
 148 #define BITS_PARITY_SPACE       0x0040
 149
 150 #define BITS_STOP_MASK          0x000f
 151 #define BITS_STOP_1             0x0000
 152 #define BITS_STOP_1_5           0x0001
 153 #define BITS_STOP_2             0x0002
 154
 155 /* CP2101_BREAK */
 156 #define BREAK_ON                0x0000
 157 #define BREAK_OFF               0x0001
 158
 159 /* CP2101_CONTROL */
 160 #define CONTROL_DTR             0x0001
 161 #define CONTROL_RTS             0x0002
 162 #define CONTROL_CTS             0x0010
 163 #define CONTROL_DSR             0x0020
 164 #define CONTROL_RING            0x0040
 165 #define CONTROL_DCD             0x0080
 166 #define CONTROL_WRITE_DTR       0x0100
 167 #define CONTROL_WRITE_RTS       0x0200
 168
 169 /*
 170  * cp2101_get_config
 171  * Reads from the CP2101 configuration registers
 172  * 'size' is specified in bytes.
 173  * 'data' is a pointer to a pre-allocated array of integers large
 174  * enough to hold 'size' bytes (with 4 bytes to each integer)
 175  */
 176 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 177                 unsigned int *data, int size)
 178 {
 179         struct usb_serial *serial = port->serial;
 180         __le32 *buf;
 181         int result, i, length;
 182
 183         /* Number of integers required to contain the array */
 184         length = (((size - 1) | 3) + 1)/4;
 185
 186         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 187         if (!buf) {
 188                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 189                 return -ENOMEM;
 190         }
 191
 192         /* For get requests, the request number must be incremented */
 193         request++;
 194
 195         /* Issue the request, attempting to read 'size' bytes */
 196         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 197                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 198                                 0, buf, size, 300);
 199
 200         /* Convert data into an array of integers */
 201         for (i=0; i<length; i++)
 202                 data[i] = le32_to_cpu(buf[i]);
 203
 204         kfree(buf);
 205
 206         if (result != size) {
 207                 dev_err(&port->dev, "%s - Unable to send config request, "
 208                                 "request=0x%x size=%d result=%d\n",
 209                                 __FUNCTION__, request, size, result);
 210                 return -EPROTO;
 211         }
 212
 213         return 0;
 214 }
 215
 216 /*
 217  * cp2101_set_config
 218  * Writes to the CP2101 configuration registers
 219  * Values less than 16 bits wide are sent directly
 220  * 'size' is specified in bytes.
 221  */
 222 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 223                 unsigned int *data, int size)
 224 {
 225         struct usb_serial *serial = port->serial;
 226         __le32 *buf;
 227         int result, i, length;
 228
 229         /* Number of integers required to contain the array */
 230         length = (((size - 1) | 3) + 1)/4;
 231
 232         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 233         if (!buf) {
 234                 dev_err(&port->dev, "%s - out of memory.\n",
 235                                 __FUNCTION__);
 236                 return -ENOMEM;
 237         }
 238
 239         /* Array of integers into bytes */
 240         for (i = 0; i < length; i++)
 241                 buf[i] = cpu_to_le32(data[i]);
 242
 243         if (size > 2) {
 244                 result = usb_control_msg (serial->dev,
 245                                 usb_sndctrlpipe(serial->dev, 0),
 246                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 247                                 0, buf, size, 300);
 248         } else {
 249                 result = usb_control_msg (serial->dev,
 250                                 usb_sndctrlpipe(serial->dev, 0),
 251                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 252                                 0, NULL, 0, 300);
 253         }
 254
 255         kfree(buf);
 256
 257         if ((size > 2 && result != size) || result < 0) {
 258                 dev_err(&port->dev, "%s - Unable to send request, "
 259                                 "request=0x%x size=%d result=%d\n",
 260                                 __FUNCTION__, request, size, result);
 261                 return -EPROTO;
 262         }
 263
 264         /* Single data value */
 265         result = usb_control_msg (serial->dev,
 266                         usb_sndctrlpipe(serial->dev, 0),
 267                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 268                         0, NULL, 0, 300);
 269         return 0;
 270 }
 271
 272 /*
 273  * cp2101_set_config_single
 274  * Convenience function for calling cp2101_set_config on single data values
 275  * without requiring an integer pointer
 276  */
 277 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 278                 u8 request, unsigned int data)
 279 {
 280         return cp2101_set_config(port, request, &data, 2);
 281 }
 282
 283 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 284 {
 285         struct usb_serial *serial = port->serial;
 286         int result;
 287
 288         dbg("%s - port %d", __FUNCTION__, port->number);
 289
 290         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 291                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 292                                 __FUNCTION__);
 293                 return -EPROTO;
 294         }
 295
 296         /* Start reading from the device */
 297         usb_fill_bulk_urb (port->read_urb, serial->dev,
 298                         usb_rcvbulkpipe(serial->dev,
 299                         port->bulk_in_endpointAddress),
 300                         port->read_urb->transfer_buffer,
 301                         port->read_urb->transfer_buffer_length,
 302                         serial->type->read_bulk_callback,
 303                         port);
 304         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 305         if (result) {
 306                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 307                                 "error %d\n", __FUNCTION__, result);
 308                 return result;
 309         }
 310
 311         /* Configure the termios structure */
 312         cp2101_get_termios(port);
 313
 314         /* Set the DTR and RTS pins low */
 315         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 316
 317         return 0;
 318 }
 319
 320 static void cp2101_cleanup (struct usb_serial_port *port)
 321 {
 322         struct usb_serial *serial = port->serial;
 323
 324         dbg("%s - port %d", __FUNCTION__, port->number);
 325
 326         if (serial->dev) {
 327                 /* shutdown any bulk reads that might be going on */
 328                 if (serial->num_bulk_out)
 329                         usb_kill_urb(port->write_urb);
 330                 if (serial->num_bulk_in)
 331                         usb_kill_urb(port->read_urb);
 332         }
 333 }
 334
 335 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 336 {
 337         dbg("%s - port %d", __FUNCTION__, port->number);
 338
 339         /* shutdown our urbs */
 340         dbg("%s - shutting down urbs", __FUNCTION__);
 341         usb_kill_urb(port->write_urb);
 342         usb_kill_urb(port->read_urb);
 343
 344         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 345 }
 346
 347 /*
 348  * cp2101_get_termios
 349  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 350  * from the device, corrects any unsupported values, and configures the
 351  * termios structure to reflect the state of the device
 352  */
 353 static void cp2101_get_termios (struct usb_serial_port *port)
 354 {
 355         unsigned int cflag, modem_ctl[4];
 356         int baud;
 357         int bits;
 358
 359         dbg("%s - port %d", __FUNCTION__, port->number);
 360
 361         if (!port->tty || !port->tty->termios) {
 362                 dbg("%s - no tty structures", __FUNCTION__);
 363                 return;
 364         }
 365
 366         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 367         /* Convert to baudrate */
 368         if (baud)
 369                 baud = BAUD_RATE_GEN_FREQ / baud;
 370
 371         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 372
 373         tty_encode_baud_rate(port->tty, baud, baud);
 374         cflag = port->tty->termios->c_cflag;
 375
 376         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 377         cflag &= ~CSIZE;
 378         switch(bits & BITS_DATA_MASK) {
 379                 case BITS_DATA_5:
 380                         dbg("%s - data bits = 5", __FUNCTION__);
 381                         cflag |= CS5;
 382                         break;
 383                 case BITS_DATA_6:
 384                         dbg("%s - data bits = 6", __FUNCTION__);
 385                         cflag |= CS6;
 386                         break;
 387                 case BITS_DATA_7:
 388                         dbg("%s - data bits = 7", __FUNCTION__);
 389                         cflag |= CS7;
 390                         break;
 391                 case BITS_DATA_8:
 392                         dbg("%s - data bits = 8", __FUNCTION__);
 393                         cflag |= CS8;
 394                         break;
 395                 case BITS_DATA_9:
 396                         dbg("%s - data bits = 9 (not supported, "
 397                                         "using 8 data bits)", __FUNCTION__);
 398                         cflag |= CS8;
 399                         bits &= ~BITS_DATA_MASK;
 400                         bits |= BITS_DATA_8;
 401                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 402                         break;
 403                 default:
 404                         dbg("%s - Unknown number of data bits, "
 405                                         "using 8", __FUNCTION__);
 406                         cflag |= CS8;
 407                         bits &= ~BITS_DATA_MASK;
 408                         bits |= BITS_DATA_8;
 409                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 410                         break;
 411         }
 412
 413         switch(bits & BITS_PARITY_MASK) {
 414                 case BITS_PARITY_NONE:
 415                         dbg("%s - parity = NONE", __FUNCTION__);
 416                         cflag &= ~PARENB;
 417                         break;
 418                 case BITS_PARITY_ODD:
 419                         dbg("%s - parity = ODD", __FUNCTION__);
 420                         cflag |= (PARENB|PARODD);
 421                         break;
 422                 case BITS_PARITY_EVEN:
 423                         dbg("%s - parity = EVEN", __FUNCTION__);
 424                         cflag &= ~PARODD;
 425                         cflag |= PARENB;
 426                         break;
 427                 case BITS_PARITY_MARK:
 428                         dbg("%s - parity = MARK (not supported, "
 429                                         "disabling parity)", __FUNCTION__);
 430                         cflag &= ~PARENB;
 431                         bits &= ~BITS_PARITY_MASK;
 432                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 433                         break;
 434                 case BITS_PARITY_SPACE:
 435                         dbg("%s - parity = SPACE (not supported, "
 436                                         "disabling parity)", __FUNCTION__);
 437                         cflag &= ~PARENB;
 438                         bits &= ~BITS_PARITY_MASK;
 439                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 440                         break;
 441                 default:
 442                         dbg("%s - Unknown parity mode, "
 443                                         "disabling parity", __FUNCTION__);
 444                         cflag &= ~PARENB;
 445                         bits &= ~BITS_PARITY_MASK;
 446                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 447                         break;
 448         }
 449
 450         cflag &= ~CSTOPB;
 451         switch(bits & BITS_STOP_MASK) {
 452                 case BITS_STOP_1:
 453                         dbg("%s - stop bits = 1", __FUNCTION__);
 454                         break;
 455                 case BITS_STOP_1_5:
 456                         dbg("%s - stop bits = 1.5 (not supported, "
 457                                         "using 1 stop bit)", __FUNCTION__);
 458                         bits &= ~BITS_STOP_MASK;
 459                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 460                         break;
 461                 case BITS_STOP_2:
 462                         dbg("%s - stop bits = 2", __FUNCTION__);
 463                         cflag |= CSTOPB;
 464                         break;
 465                 default:
 466                         dbg("%s - Unknown number of stop bits, "
 467                                         "using 1 stop bit", __FUNCTION__);
 468                         bits &= ~BITS_STOP_MASK;
 469                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 470                         break;
 471         }
 472
 473         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 474         if (modem_ctl[0] & 0x0008) {
 475                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 476                 cflag |= CRTSCTS;
 477         } else {
 478                 dbg("%s - flow control = NONE", __FUNCTION__);
 479                 cflag &= ~CRTSCTS;
 480         }
 481
 482         port->tty->termios->c_cflag = cflag;
 483 }
 484
 485 static void cp2101_set_termios (struct usb_serial_port *port,
 486                 struct ktermios *old_termios)
 487 {
 488         unsigned int cflag, old_cflag;
 489         int baud=0, bits;
 490         unsigned int modem_ctl[4];
 491
 492         dbg("%s - port %d", __FUNCTION__, port->number);
 493
 494         if (!port->tty || !port->tty->termios) {
 495                 dbg("%s - no tty structures", __FUNCTION__);
 496                 return;
 497         }
 498         port->tty->termios->c_cflag &= ~CMSPAR;
 499
 500         cflag = port->tty->termios->c_cflag;
 501         old_cflag = old_termios->c_cflag;
 502         baud = tty_get_baud_rate(port->tty);
 503
 504         /* If the baud rate is to be updated*/
 505         if (baud != tty_termios_baud_rate(old_termios)) {
 506                 switch (baud) {
 507                         case 0:
 508                         case 600:
 509                         case 1200:
 510                         case 1800:
 511                         case 2400:
 512                         case 4800:
 513                         case 7200:
 514                         case 9600:
 515                         case 14400:
 516                         case 19200:
 517                         case 28800:
 518                         case 38400:
 519                         case 55854:
 520                         case 57600:
 521                         case 115200:
 522                         case 127117:
 523                         case 230400:
 524                         case 460800:
 525                         case 921600:
 526                         case 3686400:
 527                                 break;
 528                         default:
 529                                 baud = 9600;
 530                                 break;
 531                 }
 532
 533                 if (baud) {
 534                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 535                                         baud);
 536                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 537                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 538                                 dev_err(&port->dev, "Baud rate requested not "
 539                                                 "supported by device\n");
 540                                 baud = tty_termios_baud_rate(old_termios);
 541                         }
 542                 }
 543         }
 544         /* Report back the resulting baud rate */
 545         tty_encode_baud_rate(port->tty, baud, baud);
 546
 547         /* If the number of data bits is to be updated */
 548         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 549                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 550                 bits &= ~BITS_DATA_MASK;
 551                 switch (cflag & CSIZE) {
 552                         case CS5:
 553                                 bits |= BITS_DATA_5;
 554                                 dbg("%s - data bits = 5", __FUNCTION__);
 555                                 break;
 556                         case CS6:
 557                                 bits |= BITS_DATA_6;
 558                                 dbg("%s - data bits = 6", __FUNCTION__);
 559                                 break;
 560                         case CS7:
 561                                 bits |= BITS_DATA_7;
 562                                 dbg("%s - data bits = 7", __FUNCTION__);
 563                                 break;
 564                         case CS8:
 565                                 bits |= BITS_DATA_8;
 566                                 dbg("%s - data bits = 8", __FUNCTION__);
 567                                 break;
 568                         /*case CS9:
 569                                 bits |= BITS_DATA_9;
 570                                 dbg("%s - data bits = 9", __FUNCTION__);
 571                                 break;*/
 572                         default:
 573                                 dev_err(&port->dev, "cp2101 driver does not "
 574                                         "support the number of bits requested,"
 575                                         " using 8 bit mode\n");
 576                                 bits |= BITS_DATA_8;
 577                                 break;
 578                 }
 579                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 580                         dev_err(&port->dev, "Number of data bits requested "
 581                                         "not supported by device\n");
 582         }
 583
 584         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 585                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 586                 bits &= ~BITS_PARITY_MASK;
 587                 if (cflag & PARENB) {
 588                         if (cflag & PARODD) {
 589                                 bits |= BITS_PARITY_ODD;
 590                                 dbg("%s - parity = ODD", __FUNCTION__);
 591                         } else {
 592                                 bits |= BITS_PARITY_EVEN;
 593                                 dbg("%s - parity = EVEN", __FUNCTION__);
 594                         }
 595                 }
 596                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 597                         dev_err(&port->dev, "Parity mode not supported "
 598                                         "by device\n");
 599         }
 600
 601         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 602                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 603                 bits &= ~BITS_STOP_MASK;
 604                 if (cflag & CSTOPB) {
 605                         bits |= BITS_STOP_2;
 606                         dbg("%s - stop bits = 2", __FUNCTION__);
 607                 } else {
 608                         bits |= BITS_STOP_1;
 609                         dbg("%s - stop bits = 1", __FUNCTION__);
 610                 }
 611                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 612                         dev_err(&port->dev, "Number of stop bits requested "
 613                                         "not supported by device\n");
 614         }
 615
 616         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 617                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 618                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 619                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 620                                 modem_ctl[2], modem_ctl[3]);
 621
 622                 if (cflag & CRTSCTS) {
 623                         modem_ctl[0] &= ~0x7B;
 624                         modem_ctl[0] |= 0x09;
 625                         modem_ctl[1] = 0x80;
 626                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 627                 } else {
 628                         modem_ctl[0] &= ~0x7B;
 629                         modem_ctl[0] |= 0x01;
 630                         modem_ctl[1] |= 0x40;
 631                         dbg("%s - flow control = NONE", __FUNCTION__);
 632                 }
 633
 634                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 635                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 636                                 modem_ctl[2], modem_ctl[3]);
 637                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 638         }
 639
 640 }
 641
 642 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 643                 unsigned int set, unsigned int clear)
 644 {
 645         int control = 0;
 646
 647         dbg("%s - port %d", __FUNCTION__, port->number);
 648
 649         if (set & TIOCM_RTS) {
 650                 control |= CONTROL_RTS;
 651                 control |= CONTROL_WRITE_RTS;
 652         }
 653         if (set & TIOCM_DTR) {
 654                 control |= CONTROL_DTR;
 655                 control |= CONTROL_WRITE_DTR;
 656         }
 657         if (clear & TIOCM_RTS) {
 658                 control &= ~CONTROL_RTS;
 659                 control |= CONTROL_WRITE_RTS;
 660         }
 661         if (clear & TIOCM_DTR) {
 662                 control &= ~CONTROL_DTR;
 663                 control |= CONTROL_WRITE_DTR;
 664         }
 665
 666         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 667
 668         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 669
 670 }
 671
 672 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 673 {
 674         int control, result;
 675
 676         dbg("%s - port %d", __FUNCTION__, port->number);
 677
 678         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 679
 680         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 681                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 682                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 683                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 684                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 685                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 686
 687         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 688
 689         return result;
 690 }
 691
 692 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 693 {
 694         int state;
 695
 696         dbg("%s - port %d", __FUNCTION__, port->number);
 697         if (break_state == 0)
 698                 state = BREAK_OFF;
 699         else
 700                 state = BREAK_ON;
 701         dbg("%s - turning break %s", __FUNCTION__,
 702                         state==BREAK_OFF ? "off" : "on");
 703         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 704 }
 705
 706 static int cp2101_startup (struct usb_serial *serial)
 707 {
 708         /* CP2101 buffers behave strangely unless device is reset */
 709         usb_reset_device(serial->dev);
 710         return 0;
 711 }
 712
 713 static void cp2101_shutdown (struct usb_serial *serial)
 714 {
 715         int i;
 716
 717         dbg("%s", __FUNCTION__);
 718
 719         /* Stop reads and writes on all ports */
 720         for (i=0; i < serial->num_ports; ++i) {
 721                 cp2101_cleanup(serial->port[i]);
 722         }
 723 }
 724
 725 static int __init cp2101_init (void)
 726 {
 727         int retval;
 728
 729         retval = usb_serial_register(&cp2101_device);
 730         if (retval)
 731                 return retval; /* Failed to register */
 732
 733         retval = usb_register(&cp2101_driver);
 734         if (retval) {
 735                 /* Failed to register */
 736                 usb_serial_deregister(&cp2101_device);
 737                 return retval;
 738         }
 739
 740         /* Success */
 741         info(DRIVER_DESC " " DRIVER_VERSION);
 742         return 0;
 743 }
 744
 745 static void __exit cp2101_exit (void)
 746 {
 747         usb_deregister (&cp2101_driver);
 748         usb_serial_deregister (&cp2101_device);
 749 }
 750
 751 module_init(cp2101_init);
 752 module_exit(cp2101_exit);
 753
 754 MODULE_DESCRIPTION(DRIVER_DESC);
 755 MODULE_VERSION(DRIVER_VERSION);
 756 MODULE_LICENSE("GPL");
 757
 758 module_param(debug, bool, S_IRUGO | S_IWUSR);
 759 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");