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/config.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/slab.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/usb.h>
  29 #include <asm/uaccess.h>
  30 #include "usb-serial.h"
  31
  32 /*
  33  * Version Information
  34  */
  35 #define DRIVER_VERSION "v0.05"
  36 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  37
  38 /*
  39  * Function Prototypes
  40  */
  41 static int cp2101_open(struct usb_serial_port*, struct file*);
  42 static void cp2101_cleanup(struct usb_serial_port*);
  43 static void cp2101_close(struct usb_serial_port*, struct file*);
  44 static void cp2101_get_termios(struct usb_serial_port*);
  45 static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
  46 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  47 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  48                 unsigned int, unsigned int);
  49 static void cp2101_break_ctl(struct usb_serial_port*, int);
  50 static int cp2101_startup (struct usb_serial *);
  51 static void cp2101_shutdown(struct usb_serial*);
  52
  53
  54 static int debug;
  55
  56 static struct usb_device_id id_table [] = {
  57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  58         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  59         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  60         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  63         { } /* Terminating Entry */
  64 };
  65
  66 MODULE_DEVICE_TABLE (usb, id_table);
  67
  68 static struct usb_driver cp2101_driver = {
  69         .owner          = THIS_MODULE,
  70         .name           = "cp2101",
  71         .probe          = usb_serial_probe,
  72         .disconnect     = usb_serial_disconnect,
  73         .id_table       = id_table,
  74 };
  75
  76 static struct usb_serial_driver cp2101_device = {
  77         .driver = {
  78                 .owner =        THIS_MODULE,
  79                 .name =         "cp2101",
  80         },
  81         .id_table               = id_table,
  82         .num_interrupt_in       = 0,
  83         .num_bulk_in            = 0,
  84         .num_bulk_out           = 0,
  85         .num_ports              = 1,
  86         .open                   = cp2101_open,
  87         .close                  = cp2101_close,
  88         .break_ctl              = cp2101_break_ctl,
  89         .set_termios            = cp2101_set_termios,
  90         .tiocmget               = cp2101_tiocmget,
  91         .tiocmset               = cp2101_tiocmset,
  92         .attach                 = cp2101_startup,
  93         .shutdown               = cp2101_shutdown,
  94 };
  95
  96 /* Config request types */
  97 #define REQTYPE_HOST_TO_DEVICE  0x41
  98 #define REQTYPE_DEVICE_TO_HOST  0xc1
  99
 100 /* Config SET requests. To GET, add 1 to the request number */
 101 #define CP2101_UART             0x00    /* Enable / Disable */
 102 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 103 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 104 #define CP2101_BREAK            0x05    /* On / Off */
 105 #define CP2101_CONTROL          0x07    /* Flow control line states */
 106 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 107 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 108
 109 /* CP2101_UART */
 110 #define UART_ENABLE             0x0001
 111 #define UART_DISABLE            0x0000
 112
 113 /* CP2101_BAUDRATE */
 114 #define BAUD_RATE_GEN_FREQ      0x384000
 115
 116 /* CP2101_BITS */
 117 #define BITS_DATA_MASK          0X0f00
 118 #define BITS_DATA_5             0X0500
 119 #define BITS_DATA_6             0X0600
 120 #define BITS_DATA_7             0X0700
 121 #define BITS_DATA_8             0X0800
 122 #define BITS_DATA_9             0X0900
 123
 124 #define BITS_PARITY_MASK        0x00f0
 125 #define BITS_PARITY_NONE        0x0000
 126 #define BITS_PARITY_ODD         0x0010
 127 #define BITS_PARITY_EVEN        0x0020
 128 #define BITS_PARITY_MARK        0x0030
 129 #define BITS_PARITY_SPACE       0x0040
 130
 131 #define BITS_STOP_MASK          0x000f
 132 #define BITS_STOP_1             0x0000
 133 #define BITS_STOP_1_5           0x0001
 134 #define BITS_STOP_2             0x0002
 135
 136 /* CP2101_BREAK */
 137 #define BREAK_ON                0x0000
 138 #define BREAK_OFF               0x0001
 139
 140 /* CP2101_CONTROL */
 141 #define CONTROL_DTR             0x0001
 142 #define CONTROL_RTS             0x0002
 143 #define CONTROL_CTS             0x0010
 144 #define CONTROL_DSR             0x0020
 145 #define CONTROL_RING            0x0040
 146 #define CONTROL_DCD             0x0080
 147 #define CONTROL_WRITE_DTR       0x0100
 148 #define CONTROL_WRITE_RTS       0x0200
 149
 150 /*
 151  * cp2101_get_config
 152  * Reads from the CP2101 configuration registers
 153  * 'size' is specified in bytes.
 154  * 'data' is a pointer to a pre-allocated array of integers large
 155  * enough to hold 'size' bytes (with 4 bytes to each integer)
 156  */
 157 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 158                 unsigned int *data, int size)
 159 {
 160         struct usb_serial *serial = port->serial;
 161         u32 *buf;
 162         int result, i, length;
 163
 164         /* Number of integers required to contain the array */
 165         length = (((size - 1) | 3) + 1)/4;
 166
 167         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
 168         memset(buf, 0, length * sizeof(u32));
 169
 170         if (!buf) {
 171                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 172                 return -ENOMEM;
 173         }
 174
 175         /* For get requests, the request number must be incremented */
 176         request++;
 177
 178         /* Issue the request, attempting to read 'size' bytes */
 179         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 180                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 181                                 0, buf, size, 300);
 182
 183         /* Convert data into an array of integers */
 184         for (i=0; i<length; i++)
 185                 data[i] = le32_to_cpu(buf[i]);
 186
 187         kfree(buf);
 188
 189         if (result != size) {
 190                 dev_err(&port->dev, "%s - Unable to send config request, "
 191                                 "request=0x%x size=%d result=%d\n",
 192                                 __FUNCTION__, request, size, result);
 193                 return -EPROTO;
 194         }
 195
 196         return 0;
 197 }
 198
 199 /*
 200  * cp2101_set_config
 201  * Writes to the CP2101 configuration registers
 202  * Values less than 16 bits wide are sent directly
 203  * 'size' is specified in bytes.
 204  */
 205 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 206                 unsigned int *data, int size)
 207 {
 208         struct usb_serial *serial = port->serial;
 209         u32 *buf;
 210         int result, i, length;
 211
 212         /* Number of integers required to contain the array */
 213         length = (((size - 1) | 3) + 1)/4;
 214
 215         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 216         if (!buf) {
 217                 dev_err(&port->dev, "%s - out of memory.\n",
 218                                 __FUNCTION__);
 219                 return -ENOMEM;
 220         }
 221
 222         /* Array of integers into bytes */
 223         for (i = 0; i < length; i++)
 224                 buf[i] = cpu_to_le32(data[i]);
 225
 226         if (size > 2) {
 227                 result = usb_control_msg (serial->dev,
 228                                 usb_sndctrlpipe(serial->dev, 0),
 229                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 230                                 0, buf, size, 300);
 231         } else {
 232                 result = usb_control_msg (serial->dev,
 233                                 usb_sndctrlpipe(serial->dev, 0),
 234                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 235                                 0, NULL, 0, 300);
 236         }
 237
 238         kfree(buf);
 239
 240         if ((size > 2 && result != size) || result < 0) {
 241                 dev_err(&port->dev, "%s - Unable to send request, "
 242                                 "request=0x%x size=%d result=%d\n",
 243                                 __FUNCTION__, request, size, result);
 244                 return -EPROTO;
 245         }
 246
 247         /* Single data value */
 248         result = usb_control_msg (serial->dev,
 249                         usb_sndctrlpipe(serial->dev, 0),
 250                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 251                         0, NULL, 0, 300);
 252         return 0;
 253 }
 254
 255 /*
 256  * cp2101_set_config_single
 257  * Convenience function for calling cp2101_set_config on single data values
 258  * without requiring an integer pointer
 259  */
 260 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 261                 u8 request, unsigned int data)
 262 {
 263         return cp2101_set_config(port, request, &data, 2);
 264 }
 265
 266 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 267 {
 268         struct usb_serial *serial = port->serial;
 269         int result;
 270
 271         dbg("%s - port %d", __FUNCTION__, port->number);
 272
 273         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 274                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 275                                 __FUNCTION__);
 276                 return -EPROTO;
 277         }
 278
 279         /* Start reading from the device */
 280         usb_fill_bulk_urb (port->read_urb, serial->dev,
 281                         usb_rcvbulkpipe(serial->dev,
 282                         port->bulk_in_endpointAddress),
 283                         port->read_urb->transfer_buffer,
 284                         port->read_urb->transfer_buffer_length,
 285                         serial->type->read_bulk_callback,
 286                         port);
 287         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 288         if (result) {
 289                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 290                                 "error %d\n", __FUNCTION__, result);
 291                 return result;
 292         }
 293
 294         /* Configure the termios structure */
 295         cp2101_get_termios(port);
 296
 297         /* Set the DTR and RTS pins low */
 298         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 299
 300         return 0;
 301 }
 302
 303 static void cp2101_cleanup (struct usb_serial_port *port)
 304 {
 305         struct usb_serial *serial = port->serial;
 306
 307         dbg("%s - port %d", __FUNCTION__, port->number);
 308
 309         if (serial->dev) {
 310                 /* shutdown any bulk reads that might be going on */
 311                 if (serial->num_bulk_out)
 312                         usb_kill_urb(port->write_urb);
 313                 if (serial->num_bulk_in)
 314                         usb_kill_urb(port->read_urb);
 315         }
 316 }
 317
 318 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 319 {
 320         dbg("%s - port %d", __FUNCTION__, port->number);
 321
 322         /* shutdown our urbs */
 323         dbg("%s - shutting down urbs", __FUNCTION__);
 324         usb_kill_urb(port->write_urb);
 325         usb_kill_urb(port->read_urb);
 326
 327         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 328 }
 329
 330 /*
 331  * cp2101_get_termios
 332  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 333  * from the device, corrects any unsupported values, and configures the
 334  * termios structure to reflect the state of the device
 335  */
 336 static void cp2101_get_termios (struct usb_serial_port *port)
 337 {
 338         unsigned int cflag, modem_ctl[4];
 339         int baud;
 340         int bits;
 341
 342         dbg("%s - port %d", __FUNCTION__, port->number);
 343
 344         if ((!port->tty) || (!port->tty->termios)) {
 345                 dbg("%s - no tty structures", __FUNCTION__);
 346                 return;
 347         }
 348         cflag = port->tty->termios->c_cflag;
 349
 350         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 351         /* Convert to baudrate */
 352         if (baud)
 353                 baud = BAUD_RATE_GEN_FREQ / baud;
 354
 355         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 356         cflag &= ~CBAUD;
 357         switch (baud) {
 358                 /*
 359                  * The baud rates which are commented out below
 360                  * appear to be supported by the device
 361                  * but are non-standard
 362                  */
 363                 case 600:       cflag |= B600;          break;
 364                 case 1200:      cflag |= B1200;         break;
 365                 case 1800:      cflag |= B1800;         break;
 366                 case 2400:      cflag |= B2400;         break;
 367                 case 4800:      cflag |= B4800;         break;
 368                 /*case 7200:    cflag |= B7200;         break;*/
 369                 case 9600:      cflag |= B9600;         break;
 370                 /*case 14400:   cflag |= B14400;        break;*/
 371                 case 19200:     cflag |= B19200;        break;
 372                 /*case 28800:   cflag |= B28800;        break;*/
 373                 case 38400:     cflag |= B38400;        break;
 374                 /*case 55854:   cflag |= B55054;        break;*/
 375                 case 57600:     cflag |= B57600;        break;
 376                 case 115200:    cflag |= B115200;       break;
 377                 /*case 127117:  cflag |= B127117;       break;*/
 378                 case 230400:    cflag |= B230400;       break;
 379                 case 460800:    cflag |= B460800;       break;
 380                 case 921600:    cflag |= B921600;       break;
 381                 /*case 3686400: cflag |= B3686400;      break;*/
 382                 default:
 383                         dbg("%s - Baud rate is not supported, "
 384                                         "using 9600 baud", __FUNCTION__);
 385                         cflag |= B9600;
 386                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 387                                         (BAUD_RATE_GEN_FREQ/9600));
 388                         break;
 389         }
 390
 391         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 392         cflag &= ~CSIZE;
 393         switch(bits & BITS_DATA_MASK) {
 394                 case BITS_DATA_5:
 395                         dbg("%s - data bits = 5", __FUNCTION__);
 396                         cflag |= CS5;
 397                         break;
 398                 case BITS_DATA_6:
 399                         dbg("%s - data bits = 6", __FUNCTION__);
 400                         cflag |= CS6;
 401                         break;
 402                 case BITS_DATA_7:
 403                         dbg("%s - data bits = 7", __FUNCTION__);
 404                         cflag |= CS7;
 405                         break;
 406                 case BITS_DATA_8:
 407                         dbg("%s - data bits = 8", __FUNCTION__);
 408                         cflag |= CS8;
 409                         break;
 410                 case BITS_DATA_9:
 411                         dbg("%s - data bits = 9 (not supported, "
 412                                         "using 8 data bits)", __FUNCTION__);
 413                         cflag |= CS8;
 414                         bits &= ~BITS_DATA_MASK;
 415                         bits |= BITS_DATA_8;
 416                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 417                         break;
 418                 default:
 419                         dbg("%s - Unknown number of data bits, "
 420                                         "using 8", __FUNCTION__);
 421                         cflag |= CS8;
 422                         bits &= ~BITS_DATA_MASK;
 423                         bits |= BITS_DATA_8;
 424                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 425                         break;
 426         }
 427
 428         switch(bits & BITS_PARITY_MASK) {
 429                 case BITS_PARITY_NONE:
 430                         dbg("%s - parity = NONE", __FUNCTION__);
 431                         cflag &= ~PARENB;
 432                         break;
 433                 case BITS_PARITY_ODD:
 434                         dbg("%s - parity = ODD", __FUNCTION__);
 435                         cflag |= (PARENB|PARODD);
 436                         break;
 437                 case BITS_PARITY_EVEN:
 438                         dbg("%s - parity = EVEN", __FUNCTION__);
 439                         cflag &= ~PARODD;
 440                         cflag |= PARENB;
 441                         break;
 442                 case BITS_PARITY_MARK:
 443                         dbg("%s - parity = MARK (not supported, "
 444                                         "disabling parity)", __FUNCTION__);
 445                         cflag &= ~PARENB;
 446                         bits &= ~BITS_PARITY_MASK;
 447                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 448                         break;
 449                 case BITS_PARITY_SPACE:
 450                         dbg("%s - parity = SPACE (not supported, "
 451                                         "disabling parity)", __FUNCTION__);
 452                         cflag &= ~PARENB;
 453                         bits &= ~BITS_PARITY_MASK;
 454                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 455                         break;
 456                 default:
 457                         dbg("%s - Unknown parity mode, "
 458                                         "disabling parity", __FUNCTION__);
 459                         cflag &= ~PARENB;
 460                         bits &= ~BITS_PARITY_MASK;
 461                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 462                         break;
 463         }
 464
 465         cflag &= ~CSTOPB;
 466         switch(bits & BITS_STOP_MASK) {
 467                 case BITS_STOP_1:
 468                         dbg("%s - stop bits = 1", __FUNCTION__);
 469                         break;
 470                 case BITS_STOP_1_5:
 471                         dbg("%s - stop bits = 1.5 (not supported, "
 472                                         "using 1 stop bit)", __FUNCTION__);
 473                         bits &= ~BITS_STOP_MASK;
 474                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 475                         break;
 476                 case BITS_STOP_2:
 477                         dbg("%s - stop bits = 2", __FUNCTION__);
 478                         cflag |= CSTOPB;
 479                         break;
 480                 default:
 481                         dbg("%s - Unknown number of stop bits, "
 482                                         "using 1 stop bit", __FUNCTION__);
 483                         bits &= ~BITS_STOP_MASK;
 484                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 485                         break;
 486         }
 487
 488         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 489         if (modem_ctl[0] & 0x0008) {
 490                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 491                 cflag |= CRTSCTS;
 492         } else {
 493                 dbg("%s - flow control = NONE", __FUNCTION__);
 494                 cflag &= ~CRTSCTS;
 495         }
 496
 497         port->tty->termios->c_cflag = cflag;
 498 }
 499
 500 static void cp2101_set_termios (struct usb_serial_port *port,
 501                 struct termios *old_termios)
 502 {
 503         unsigned int cflag, old_cflag=0;
 504         int baud=0, bits;
 505         unsigned int modem_ctl[4];
 506
 507         dbg("%s - port %d", __FUNCTION__, port->number);
 508
 509         if ((!port->tty) || (!port->tty->termios)) {
 510                 dbg("%s - no tty structures", __FUNCTION__);
 511                 return;
 512         }
 513         cflag = port->tty->termios->c_cflag;
 514
 515         /* Check that they really want us to change something */
 516         if (old_termios) {
 517                 if ((cflag == old_termios->c_cflag) &&
 518                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 519                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 520                         dbg("%s - nothing to change...", __FUNCTION__);
 521                         return;
 522                 }
 523
 524                 old_cflag = old_termios->c_cflag;
 525         }
 526
 527         /* If the baud rate is to be updated*/
 528         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 529                 switch (cflag & CBAUD) {
 530                         /*
 531                          * The baud rates which are commented out below
 532                          * appear to be supported by the device
 533                          * but are non-standard
 534                          */
 535                         case B0:        baud = 0;       break;
 536                         case B600:      baud = 600;     break;
 537                         case B1200:     baud = 1200;    break;
 538                         case B1800:     baud = 1800;    break;
 539                         case B2400:     baud = 2400;    break;
 540                         case B4800:     baud = 4800;    break;
 541                         /*case B7200:   baud = 7200;    break;*/
 542                         case B9600:     baud = 9600;    break;
 543                         /*ase B14400:   baud = 14400;   break;*/
 544                         case B19200:    baud = 19200;   break;
 545                         /*case B28800:  baud = 28800;   break;*/
 546                         case B38400:    baud = 38400;   break;
 547                         /*case B55854:  baud = 55054;   break;*/
 548                         case B57600:    baud = 57600;   break;
 549                         case B115200:   baud = 115200;  break;
 550                         /*case B127117: baud = 127117;  break;*/
 551                         case B230400:   baud = 230400;  break;
 552                         case B460800:   baud = 460800;  break;
 553                         case B921600:   baud = 921600;  break;
 554                         /*case B3686400:        baud = 3686400; break;*/
 555                         default:
 556                                 dev_err(&port->dev, "cp2101 driver does not "
 557                                         "support the baudrate requested\n");
 558                                 break;
 559                 }
 560
 561                 if (baud) {
 562                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 563                                         baud);
 564                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 565                                                 (BAUD_RATE_GEN_FREQ / baud)))
 566                                 dev_err(&port->dev, "Baud rate requested not "
 567                                                 "supported by device\n");
 568                 }
 569         }
 570
 571         /* If the number of data bits is to be updated */
 572         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 573                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 574                 bits &= ~BITS_DATA_MASK;
 575                 switch (cflag & CSIZE) {
 576                         case CS5:
 577                                 bits |= BITS_DATA_5;
 578                                 dbg("%s - data bits = 5", __FUNCTION__);
 579                                 break;
 580                         case CS6:
 581                                 bits |= BITS_DATA_6;
 582                                 dbg("%s - data bits = 6", __FUNCTION__);
 583                                 break;
 584                         case CS7:
 585                                 bits |= BITS_DATA_7;
 586                                 dbg("%s - data bits = 7", __FUNCTION__);
 587                                 break;
 588                         case CS8:
 589                                 bits |= BITS_DATA_8;
 590                                 dbg("%s - data bits = 8", __FUNCTION__);
 591                                 break;
 592                         /*case CS9:
 593                                 bits |= BITS_DATA_9;
 594                                 dbg("%s - data bits = 9", __FUNCTION__);
 595                                 break;*/
 596                         default:
 597                                 dev_err(&port->dev, "cp2101 driver does not "
 598                                         "support the number of bits requested,"
 599                                         " using 8 bit mode\n");
 600                                 bits |= BITS_DATA_8;
 601                                 break;
 602                 }
 603                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 604                         dev_err(&port->dev, "Number of data bits requested "
 605                                         "not supported by device\n");
 606         }
 607
 608         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 609                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 610                 bits &= ~BITS_PARITY_MASK;
 611                 if (cflag & PARENB) {
 612                         if (cflag & PARODD) {
 613                                 bits |= BITS_PARITY_ODD;
 614                                 dbg("%s - parity = ODD", __FUNCTION__);
 615                         } else {
 616                                 bits |= BITS_PARITY_EVEN;
 617                                 dbg("%s - parity = EVEN", __FUNCTION__);
 618                         }
 619                 }
 620                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 621                         dev_err(&port->dev, "Parity mode not supported "
 622                                         "by device\n");
 623         }
 624
 625         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 626                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 627                 bits &= ~BITS_STOP_MASK;
 628                 if (cflag & CSTOPB) {
 629                         bits |= BITS_STOP_2;
 630                         dbg("%s - stop bits = 2", __FUNCTION__);
 631                 } else {
 632                         bits |= BITS_STOP_1;
 633                         dbg("%s - stop bits = 1", __FUNCTION__);
 634                 }
 635                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 636                         dev_err(&port->dev, "Number of stop bits requested "
 637                                         "not supported by device\n");
 638         }
 639
 640         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 641                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 642                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 643                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 644                                 modem_ctl[2], modem_ctl[3]);
 645
 646                 if (cflag & CRTSCTS) {
 647                         modem_ctl[0] &= ~0x7B;
 648                         modem_ctl[0] |= 0x09;
 649                         modem_ctl[1] = 0x80;
 650                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 651                 } else {
 652                         modem_ctl[0] &= ~0x7B;
 653                         modem_ctl[0] |= 0x01;
 654                         modem_ctl[1] |= 0x40;
 655                         dbg("%s - flow control = NONE", __FUNCTION__);
 656                 }
 657
 658                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 659                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 660                                 modem_ctl[2], modem_ctl[3]);
 661                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 662         }
 663
 664 }
 665
 666 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 667                 unsigned int set, unsigned int clear)
 668 {
 669         int control = 0;
 670
 671         dbg("%s - port %d", __FUNCTION__, port->number);
 672
 673         if (set & TIOCM_RTS) {
 674                 control |= CONTROL_RTS;
 675                 control |= CONTROL_WRITE_RTS;
 676         }
 677         if (set & TIOCM_DTR) {
 678                 control |= CONTROL_DTR;
 679                 control |= CONTROL_WRITE_DTR;
 680         }
 681         if (clear & TIOCM_RTS) {
 682                 control &= ~CONTROL_RTS;
 683                 control |= CONTROL_WRITE_RTS;
 684         }
 685         if (clear & TIOCM_DTR) {
 686                 control &= ~CONTROL_DTR;
 687                 control |= CONTROL_WRITE_DTR;
 688         }
 689
 690         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 691
 692         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 693
 694 }
 695
 696 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 697 {
 698         int control, result;
 699
 700         dbg("%s - port %d", __FUNCTION__, port->number);
 701
 702         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 703
 704         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 705                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 706                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 707                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 708                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 709                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 710
 711         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 712
 713         return result;
 714 }
 715
 716 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 717 {
 718         int state;
 719
 720         dbg("%s - port %d", __FUNCTION__, port->number);
 721         if (break_state == 0)
 722                 state = BREAK_OFF;
 723         else
 724                 state = BREAK_ON;
 725         dbg("%s - turning break %s", __FUNCTION__,
 726                         state==BREAK_OFF ? "off" : "on");
 727         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 728 }
 729
 730 static int cp2101_startup (struct usb_serial *serial)
 731 {
 732         /* CP2101 buffers behave strangely unless device is reset */
 733         usb_reset_device(serial->dev);
 734         return 0;
 735 }
 736
 737 static void cp2101_shutdown (struct usb_serial *serial)
 738 {
 739         int i;
 740
 741         dbg("%s", __FUNCTION__);
 742
 743         /* Stop reads and writes on all ports */
 744         for (i=0; i < serial->num_ports; ++i) {
 745                 cp2101_cleanup(serial->port[i]);
 746         }
 747 }
 748
 749 static int __init cp2101_init (void)
 750 {
 751         int retval;
 752
 753         retval = usb_serial_register(&cp2101_device);
 754         if (retval)
 755                 return retval; /* Failed to register */
 756
 757         retval = usb_register(&cp2101_driver);
 758         if (retval) {
 759                 /* Failed to register */
 760                 usb_serial_deregister(&cp2101_device);
 761                 return retval;
 762         }
 763
 764         /* Success */
 765         info(DRIVER_DESC " " DRIVER_VERSION);
 766         return 0;
 767 }
 768
 769 static void __exit cp2101_exit (void)
 770 {
 771         usb_deregister (&cp2101_driver);
 772         usb_serial_deregister (&cp2101_device);
 773 }
 774
 775 module_init(cp2101_init);
 776 module_exit(cp2101_exit);
 777
 778 MODULE_DESCRIPTION(DRIVER_DESC);
 779 MODULE_VERSION(DRIVER_VERSION);
 780 MODULE_LICENSE("GPL");
 781
 782 module_param(debug, bool, S_IRUGO | S_IWUSR);
 783 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");