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 termios*);
  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(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  57         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  58         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  59         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  60         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  61         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  66         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  67         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  68         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  69         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  70         { } /* Terminating Entry */
  71 };
  72
  73 MODULE_DEVICE_TABLE (usb, id_table);
  74
  75 static struct usb_driver cp2101_driver = {
  76         .name           = "cp2101",
  77         .probe          = usb_serial_probe,
  78         .disconnect     = usb_serial_disconnect,
  79         .id_table       = id_table,
  80         .no_dynamic_id  =       1,
  81 };
  82
  83 static struct usb_serial_driver cp2101_device = {
  84         .driver = {
  85                 .owner =        THIS_MODULE,
  86                 .name =         "cp2101",
  87         },
  88         .id_table               = id_table,
  89         .num_interrupt_in       = 0,
  90         .num_bulk_in            = 0,
  91         .num_bulk_out           = 0,
  92         .num_ports              = 1,
  93         .open                   = cp2101_open,
  94         .close                  = cp2101_close,
  95         .break_ctl              = cp2101_break_ctl,
  96         .set_termios            = cp2101_set_termios,
  97         .tiocmget               = cp2101_tiocmget,
  98         .tiocmset               = cp2101_tiocmset,
  99         .attach                 = cp2101_startup,
 100         .shutdown               = cp2101_shutdown,
 101 };
 102
 103 /* Config request types */
 104 #define REQTYPE_HOST_TO_DEVICE  0x41
 105 #define REQTYPE_DEVICE_TO_HOST  0xc1
 106
 107 /* Config SET requests. To GET, add 1 to the request number */
 108 #define CP2101_UART             0x00    /* Enable / Disable */
 109 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 110 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 111 #define CP2101_BREAK            0x05    /* On / Off */
 112 #define CP2101_CONTROL          0x07    /* Flow control line states */
 113 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 114 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 115
 116 /* CP2101_UART */
 117 #define UART_ENABLE             0x0001
 118 #define UART_DISABLE            0x0000
 119
 120 /* CP2101_BAUDRATE */
 121 #define BAUD_RATE_GEN_FREQ      0x384000
 122
 123 /* CP2101_BITS */
 124 #define BITS_DATA_MASK          0X0f00
 125 #define BITS_DATA_5             0X0500
 126 #define BITS_DATA_6             0X0600
 127 #define BITS_DATA_7             0X0700
 128 #define BITS_DATA_8             0X0800
 129 #define BITS_DATA_9             0X0900
 130
 131 #define BITS_PARITY_MASK        0x00f0
 132 #define BITS_PARITY_NONE        0x0000
 133 #define BITS_PARITY_ODD         0x0010
 134 #define BITS_PARITY_EVEN        0x0020
 135 #define BITS_PARITY_MARK        0x0030
 136 #define BITS_PARITY_SPACE       0x0040
 137
 138 #define BITS_STOP_MASK          0x000f
 139 #define BITS_STOP_1             0x0000
 140 #define BITS_STOP_1_5           0x0001
 141 #define BITS_STOP_2             0x0002
 142
 143 /* CP2101_BREAK */
 144 #define BREAK_ON                0x0000
 145 #define BREAK_OFF               0x0001
 146
 147 /* CP2101_CONTROL */
 148 #define CONTROL_DTR             0x0001
 149 #define CONTROL_RTS             0x0002
 150 #define CONTROL_CTS             0x0010
 151 #define CONTROL_DSR             0x0020
 152 #define CONTROL_RING            0x0040
 153 #define CONTROL_DCD             0x0080
 154 #define CONTROL_WRITE_DTR       0x0100
 155 #define CONTROL_WRITE_RTS       0x0200
 156
 157 /*
 158  * cp2101_get_config
 159  * Reads from the CP2101 configuration registers
 160  * 'size' is specified in bytes.
 161  * 'data' is a pointer to a pre-allocated array of integers large
 162  * enough to hold 'size' bytes (with 4 bytes to each integer)
 163  */
 164 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 165                 unsigned int *data, int size)
 166 {
 167         struct usb_serial *serial = port->serial;
 168         u32 *buf;
 169         int result, i, length;
 170
 171         /* Number of integers required to contain the array */
 172         length = (((size - 1) | 3) + 1)/4;
 173
 174         buf = kcalloc(length, sizeof(u32), GFP_KERNEL);
 175         if (!buf) {
 176                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 177                 return -ENOMEM;
 178         }
 179
 180         /* For get requests, the request number must be incremented */
 181         request++;
 182
 183         /* Issue the request, attempting to read 'size' bytes */
 184         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 185                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 186                                 0, buf, size, 300);
 187
 188         /* Convert data into an array of integers */
 189         for (i=0; i<length; i++)
 190                 data[i] = le32_to_cpu(buf[i]);
 191
 192         kfree(buf);
 193
 194         if (result != size) {
 195                 dev_err(&port->dev, "%s - Unable to send config request, "
 196                                 "request=0x%x size=%d result=%d\n",
 197                                 __FUNCTION__, request, size, result);
 198                 return -EPROTO;
 199         }
 200
 201         return 0;
 202 }
 203
 204 /*
 205  * cp2101_set_config
 206  * Writes to the CP2101 configuration registers
 207  * Values less than 16 bits wide are sent directly
 208  * 'size' is specified in bytes.
 209  */
 210 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 211                 unsigned int *data, int size)
 212 {
 213         struct usb_serial *serial = port->serial;
 214         u32 *buf;
 215         int result, i, length;
 216
 217         /* Number of integers required to contain the array */
 218         length = (((size - 1) | 3) + 1)/4;
 219
 220         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 221         if (!buf) {
 222                 dev_err(&port->dev, "%s - out of memory.\n",
 223                                 __FUNCTION__);
 224                 return -ENOMEM;
 225         }
 226
 227         /* Array of integers into bytes */
 228         for (i = 0; i < length; i++)
 229                 buf[i] = cpu_to_le32(data[i]);
 230
 231         if (size > 2) {
 232                 result = usb_control_msg (serial->dev,
 233                                 usb_sndctrlpipe(serial->dev, 0),
 234                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 235                                 0, buf, size, 300);
 236         } else {
 237                 result = usb_control_msg (serial->dev,
 238                                 usb_sndctrlpipe(serial->dev, 0),
 239                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 240                                 0, NULL, 0, 300);
 241         }
 242
 243         kfree(buf);
 244
 245         if ((size > 2 && result != size) || result < 0) {
 246                 dev_err(&port->dev, "%s - Unable to send request, "
 247                                 "request=0x%x size=%d result=%d\n",
 248                                 __FUNCTION__, request, size, result);
 249                 return -EPROTO;
 250         }
 251
 252         /* Single data value */
 253         result = usb_control_msg (serial->dev,
 254                         usb_sndctrlpipe(serial->dev, 0),
 255                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 256                         0, NULL, 0, 300);
 257         return 0;
 258 }
 259
 260 /*
 261  * cp2101_set_config_single
 262  * Convenience function for calling cp2101_set_config on single data values
 263  * without requiring an integer pointer
 264  */
 265 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 266                 u8 request, unsigned int data)
 267 {
 268         return cp2101_set_config(port, request, &data, 2);
 269 }
 270
 271 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 272 {
 273         struct usb_serial *serial = port->serial;
 274         int result;
 275
 276         dbg("%s - port %d", __FUNCTION__, port->number);
 277
 278         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 279                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 280                                 __FUNCTION__);
 281                 return -EPROTO;
 282         }
 283
 284         /* Start reading from the device */
 285         usb_fill_bulk_urb (port->read_urb, serial->dev,
 286                         usb_rcvbulkpipe(serial->dev,
 287                         port->bulk_in_endpointAddress),
 288                         port->read_urb->transfer_buffer,
 289                         port->read_urb->transfer_buffer_length,
 290                         serial->type->read_bulk_callback,
 291                         port);
 292         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 293         if (result) {
 294                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 295                                 "error %d\n", __FUNCTION__, result);
 296                 return result;
 297         }
 298
 299         /* Configure the termios structure */
 300         cp2101_get_termios(port);
 301
 302         /* Set the DTR and RTS pins low */
 303         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 304
 305         return 0;
 306 }
 307
 308 static void cp2101_cleanup (struct usb_serial_port *port)
 309 {
 310         struct usb_serial *serial = port->serial;
 311
 312         dbg("%s - port %d", __FUNCTION__, port->number);
 313
 314         if (serial->dev) {
 315                 /* shutdown any bulk reads that might be going on */
 316                 if (serial->num_bulk_out)
 317                         usb_kill_urb(port->write_urb);
 318                 if (serial->num_bulk_in)
 319                         usb_kill_urb(port->read_urb);
 320         }
 321 }
 322
 323 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 324 {
 325         dbg("%s - port %d", __FUNCTION__, port->number);
 326
 327         /* shutdown our urbs */
 328         dbg("%s - shutting down urbs", __FUNCTION__);
 329         usb_kill_urb(port->write_urb);
 330         usb_kill_urb(port->read_urb);
 331
 332         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 333 }
 334
 335 /*
 336  * cp2101_get_termios
 337  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 338  * from the device, corrects any unsupported values, and configures the
 339  * termios structure to reflect the state of the device
 340  */
 341 static void cp2101_get_termios (struct usb_serial_port *port)
 342 {
 343         unsigned int cflag, modem_ctl[4];
 344         int baud;
 345         int bits;
 346
 347         dbg("%s - port %d", __FUNCTION__, port->number);
 348
 349         if ((!port->tty) || (!port->tty->termios)) {
 350                 dbg("%s - no tty structures", __FUNCTION__);
 351                 return;
 352         }
 353         cflag = port->tty->termios->c_cflag;
 354
 355         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 356         /* Convert to baudrate */
 357         if (baud)
 358                 baud = BAUD_RATE_GEN_FREQ / baud;
 359
 360         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 361         cflag &= ~CBAUD;
 362         switch (baud) {
 363                 /*
 364                  * The baud rates which are commented out below
 365                  * appear to be supported by the device
 366                  * but are non-standard
 367                  */
 368                 case 600:       cflag |= B600;          break;
 369                 case 1200:      cflag |= B1200;         break;
 370                 case 1800:      cflag |= B1800;         break;
 371                 case 2400:      cflag |= B2400;         break;
 372                 case 4800:      cflag |= B4800;         break;
 373                 /*case 7200:    cflag |= B7200;         break;*/
 374                 case 9600:      cflag |= B9600;         break;
 375                 /*case 14400:   cflag |= B14400;        break;*/
 376                 case 19200:     cflag |= B19200;        break;
 377                 /*case 28800:   cflag |= B28800;        break;*/
 378                 case 38400:     cflag |= B38400;        break;
 379                 /*case 55854:   cflag |= B55054;        break;*/
 380                 case 57600:     cflag |= B57600;        break;
 381                 case 115200:    cflag |= B115200;       break;
 382                 /*case 127117:  cflag |= B127117;       break;*/
 383                 case 230400:    cflag |= B230400;       break;
 384                 case 460800:    cflag |= B460800;       break;
 385                 case 921600:    cflag |= B921600;       break;
 386                 /*case 3686400: cflag |= B3686400;      break;*/
 387                 default:
 388                         dbg("%s - Baud rate is not supported, "
 389                                         "using 9600 baud", __FUNCTION__);
 390                         cflag |= B9600;
 391                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 392                                         (BAUD_RATE_GEN_FREQ/9600));
 393                         break;
 394         }
 395
 396         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 397         cflag &= ~CSIZE;
 398         switch(bits & BITS_DATA_MASK) {
 399                 case BITS_DATA_5:
 400                         dbg("%s - data bits = 5", __FUNCTION__);
 401                         cflag |= CS5;
 402                         break;
 403                 case BITS_DATA_6:
 404                         dbg("%s - data bits = 6", __FUNCTION__);
 405                         cflag |= CS6;
 406                         break;
 407                 case BITS_DATA_7:
 408                         dbg("%s - data bits = 7", __FUNCTION__);
 409                         cflag |= CS7;
 410                         break;
 411                 case BITS_DATA_8:
 412                         dbg("%s - data bits = 8", __FUNCTION__);
 413                         cflag |= CS8;
 414                         break;
 415                 case BITS_DATA_9:
 416                         dbg("%s - data bits = 9 (not supported, "
 417                                         "using 8 data bits)", __FUNCTION__);
 418                         cflag |= CS8;
 419                         bits &= ~BITS_DATA_MASK;
 420                         bits |= BITS_DATA_8;
 421                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 422                         break;
 423                 default:
 424                         dbg("%s - Unknown number of data bits, "
 425                                         "using 8", __FUNCTION__);
 426                         cflag |= CS8;
 427                         bits &= ~BITS_DATA_MASK;
 428                         bits |= BITS_DATA_8;
 429                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 430                         break;
 431         }
 432
 433         switch(bits & BITS_PARITY_MASK) {
 434                 case BITS_PARITY_NONE:
 435                         dbg("%s - parity = NONE", __FUNCTION__);
 436                         cflag &= ~PARENB;
 437                         break;
 438                 case BITS_PARITY_ODD:
 439                         dbg("%s - parity = ODD", __FUNCTION__);
 440                         cflag |= (PARENB|PARODD);
 441                         break;
 442                 case BITS_PARITY_EVEN:
 443                         dbg("%s - parity = EVEN", __FUNCTION__);
 444                         cflag &= ~PARODD;
 445                         cflag |= PARENB;
 446                         break;
 447                 case BITS_PARITY_MARK:
 448                         dbg("%s - parity = MARK (not supported, "
 449                                         "disabling parity)", __FUNCTION__);
 450                         cflag &= ~PARENB;
 451                         bits &= ~BITS_PARITY_MASK;
 452                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 453                         break;
 454                 case BITS_PARITY_SPACE:
 455                         dbg("%s - parity = SPACE (not supported, "
 456                                         "disabling parity)", __FUNCTION__);
 457                         cflag &= ~PARENB;
 458                         bits &= ~BITS_PARITY_MASK;
 459                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 460                         break;
 461                 default:
 462                         dbg("%s - Unknown parity mode, "
 463                                         "disabling parity", __FUNCTION__);
 464                         cflag &= ~PARENB;
 465                         bits &= ~BITS_PARITY_MASK;
 466                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 467                         break;
 468         }
 469
 470         cflag &= ~CSTOPB;
 471         switch(bits & BITS_STOP_MASK) {
 472                 case BITS_STOP_1:
 473                         dbg("%s - stop bits = 1", __FUNCTION__);
 474                         break;
 475                 case BITS_STOP_1_5:
 476                         dbg("%s - stop bits = 1.5 (not supported, "
 477                                         "using 1 stop bit)", __FUNCTION__);
 478                         bits &= ~BITS_STOP_MASK;
 479                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 480                         break;
 481                 case BITS_STOP_2:
 482                         dbg("%s - stop bits = 2", __FUNCTION__);
 483                         cflag |= CSTOPB;
 484                         break;
 485                 default:
 486                         dbg("%s - Unknown number of stop bits, "
 487                                         "using 1 stop bit", __FUNCTION__);
 488                         bits &= ~BITS_STOP_MASK;
 489                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 490                         break;
 491         }
 492
 493         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 494         if (modem_ctl[0] & 0x0008) {
 495                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 496                 cflag |= CRTSCTS;
 497         } else {
 498                 dbg("%s - flow control = NONE", __FUNCTION__);
 499                 cflag &= ~CRTSCTS;
 500         }
 501
 502         port->tty->termios->c_cflag = cflag;
 503 }
 504
 505 static void cp2101_set_termios (struct usb_serial_port *port,
 506                 struct termios *old_termios)
 507 {
 508         unsigned int cflag, old_cflag=0;
 509         int baud=0, bits;
 510         unsigned int modem_ctl[4];
 511
 512         dbg("%s - port %d", __FUNCTION__, port->number);
 513
 514         if ((!port->tty) || (!port->tty->termios)) {
 515                 dbg("%s - no tty structures", __FUNCTION__);
 516                 return;
 517         }
 518         cflag = port->tty->termios->c_cflag;
 519
 520         /* Check that they really want us to change something */
 521         if (old_termios) {
 522                 if ((cflag == old_termios->c_cflag) &&
 523                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 524                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 525                         dbg("%s - nothing to change...", __FUNCTION__);
 526                         return;
 527                 }
 528
 529                 old_cflag = old_termios->c_cflag;
 530         }
 531
 532         /* If the baud rate is to be updated*/
 533         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 534                 switch (cflag & CBAUD) {
 535                         /*
 536                          * The baud rates which are commented out below
 537                          * appear to be supported by the device
 538                          * but are non-standard
 539                          */
 540                         case B0:        baud = 0;       break;
 541                         case B600:      baud = 600;     break;
 542                         case B1200:     baud = 1200;    break;
 543                         case B1800:     baud = 1800;    break;
 544                         case B2400:     baud = 2400;    break;
 545                         case B4800:     baud = 4800;    break;
 546                         /*case B7200:   baud = 7200;    break;*/
 547                         case B9600:     baud = 9600;    break;
 548                         /*ase B14400:   baud = 14400;   break;*/
 549                         case B19200:    baud = 19200;   break;
 550                         /*case B28800:  baud = 28800;   break;*/
 551                         case B38400:    baud = 38400;   break;
 552                         /*case B55854:  baud = 55054;   break;*/
 553                         case B57600:    baud = 57600;   break;
 554                         case B115200:   baud = 115200;  break;
 555                         /*case B127117: baud = 127117;  break;*/
 556                         case B230400:   baud = 230400;  break;
 557                         case B460800:   baud = 460800;  break;
 558                         case B921600:   baud = 921600;  break;
 559                         /*case B3686400:        baud = 3686400; break;*/
 560                         default:
 561                                 dev_err(&port->dev, "cp2101 driver does not "
 562                                         "support the baudrate requested\n");
 563                                 break;
 564                 }
 565
 566                 if (baud) {
 567                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 568                                         baud);
 569                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 570                                                 (BAUD_RATE_GEN_FREQ / baud)))
 571                                 dev_err(&port->dev, "Baud rate requested not "
 572                                                 "supported by device\n");
 573                 }
 574         }
 575
 576         /* If the number of data bits is to be updated */
 577         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 578                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 579                 bits &= ~BITS_DATA_MASK;
 580                 switch (cflag & CSIZE) {
 581                         case CS5:
 582                                 bits |= BITS_DATA_5;
 583                                 dbg("%s - data bits = 5", __FUNCTION__);
 584                                 break;
 585                         case CS6:
 586                                 bits |= BITS_DATA_6;
 587                                 dbg("%s - data bits = 6", __FUNCTION__);
 588                                 break;
 589                         case CS7:
 590                                 bits |= BITS_DATA_7;
 591                                 dbg("%s - data bits = 7", __FUNCTION__);
 592                                 break;
 593                         case CS8:
 594                                 bits |= BITS_DATA_8;
 595                                 dbg("%s - data bits = 8", __FUNCTION__);
 596                                 break;
 597                         /*case CS9:
 598                                 bits |= BITS_DATA_9;
 599                                 dbg("%s - data bits = 9", __FUNCTION__);
 600                                 break;*/
 601                         default:
 602                                 dev_err(&port->dev, "cp2101 driver does not "
 603                                         "support the number of bits requested,"
 604                                         " using 8 bit mode\n");
 605                                 bits |= BITS_DATA_8;
 606                                 break;
 607                 }
 608                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 609                         dev_err(&port->dev, "Number of data bits requested "
 610                                         "not supported by device\n");
 611         }
 612
 613         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 614                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 615                 bits &= ~BITS_PARITY_MASK;
 616                 if (cflag & PARENB) {
 617                         if (cflag & PARODD) {
 618                                 bits |= BITS_PARITY_ODD;
 619                                 dbg("%s - parity = ODD", __FUNCTION__);
 620                         } else {
 621                                 bits |= BITS_PARITY_EVEN;
 622                                 dbg("%s - parity = EVEN", __FUNCTION__);
 623                         }
 624                 }
 625                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 626                         dev_err(&port->dev, "Parity mode not supported "
 627                                         "by device\n");
 628         }
 629
 630         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 631                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 632                 bits &= ~BITS_STOP_MASK;
 633                 if (cflag & CSTOPB) {
 634                         bits |= BITS_STOP_2;
 635                         dbg("%s - stop bits = 2", __FUNCTION__);
 636                 } else {
 637                         bits |= BITS_STOP_1;
 638                         dbg("%s - stop bits = 1", __FUNCTION__);
 639                 }
 640                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 641                         dev_err(&port->dev, "Number of stop bits requested "
 642                                         "not supported by device\n");
 643         }
 644
 645         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 646                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 647                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 648                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 649                                 modem_ctl[2], modem_ctl[3]);
 650
 651                 if (cflag & CRTSCTS) {
 652                         modem_ctl[0] &= ~0x7B;
 653                         modem_ctl[0] |= 0x09;
 654                         modem_ctl[1] = 0x80;
 655                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 656                 } else {
 657                         modem_ctl[0] &= ~0x7B;
 658                         modem_ctl[0] |= 0x01;
 659                         modem_ctl[1] |= 0x40;
 660                         dbg("%s - flow control = NONE", __FUNCTION__);
 661                 }
 662
 663                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 664                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 665                                 modem_ctl[2], modem_ctl[3]);
 666                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 667         }
 668
 669 }
 670
 671 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 672                 unsigned int set, unsigned int clear)
 673 {
 674         int control = 0;
 675
 676         dbg("%s - port %d", __FUNCTION__, port->number);
 677
 678         if (set & TIOCM_RTS) {
 679                 control |= CONTROL_RTS;
 680                 control |= CONTROL_WRITE_RTS;
 681         }
 682         if (set & TIOCM_DTR) {
 683                 control |= CONTROL_DTR;
 684                 control |= CONTROL_WRITE_DTR;
 685         }
 686         if (clear & TIOCM_RTS) {
 687                 control &= ~CONTROL_RTS;
 688                 control |= CONTROL_WRITE_RTS;
 689         }
 690         if (clear & TIOCM_DTR) {
 691                 control &= ~CONTROL_DTR;
 692                 control |= CONTROL_WRITE_DTR;
 693         }
 694
 695         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 696
 697         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 698
 699 }
 700
 701 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 702 {
 703         int control, result;
 704
 705         dbg("%s - port %d", __FUNCTION__, port->number);
 706
 707         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 708
 709         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 710                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 711                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 712                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 713                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 714                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 715
 716         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 717
 718         return result;
 719 }
 720
 721 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 722 {
 723         int state;
 724
 725         dbg("%s - port %d", __FUNCTION__, port->number);
 726         if (break_state == 0)
 727                 state = BREAK_OFF;
 728         else
 729                 state = BREAK_ON;
 730         dbg("%s - turning break %s", __FUNCTION__,
 731                         state==BREAK_OFF ? "off" : "on");
 732         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 733 }
 734
 735 static int cp2101_startup (struct usb_serial *serial)
 736 {
 737         /* CP2101 buffers behave strangely unless device is reset */
 738         usb_reset_device(serial->dev);
 739         return 0;
 740 }
 741
 742 static void cp2101_shutdown (struct usb_serial *serial)
 743 {
 744         int i;
 745
 746         dbg("%s", __FUNCTION__);
 747
 748         /* Stop reads and writes on all ports */
 749         for (i=0; i < serial->num_ports; ++i) {
 750                 cp2101_cleanup(serial->port[i]);
 751         }
 752 }
 753
 754 static int __init cp2101_init (void)
 755 {
 756         int retval;
 757
 758         retval = usb_serial_register(&cp2101_device);
 759         if (retval)
 760                 return retval; /* Failed to register */
 761
 762         retval = usb_register(&cp2101_driver);
 763         if (retval) {
 764                 /* Failed to register */
 765                 usb_serial_deregister(&cp2101_device);
 766                 return retval;
 767         }
 768
 769         /* Success */
 770         info(DRIVER_DESC " " DRIVER_VERSION);
 771         return 0;
 772 }
 773
 774 static void __exit cp2101_exit (void)
 775 {
 776         usb_deregister (&cp2101_driver);
 777         usb_serial_deregister (&cp2101_device);
 778 }
 779
 780 module_init(cp2101_init);
 781 module_exit(cp2101_exit);
 782
 783 MODULE_DESCRIPTION(DRIVER_DESC);
 784 MODULE_VERSION(DRIVER_VERSION);
 785 MODULE_LICENSE("GPL");
 786
 787 module_param(debug, bool, S_IRUGO | S_IWUSR);
 788 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");