SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  64         { } /* Terminating Entry */
  65 };
  66
  67 MODULE_DEVICE_TABLE (usb, id_table);
  68
  69 static struct usb_driver cp2101_driver = {
  70         .owner          = THIS_MODULE,
  71         .name           = "cp2101",
  72         .probe          = usb_serial_probe,
  73         .disconnect     = usb_serial_disconnect,
  74         .id_table       = id_table,
  75 };
  76
  77 static struct usb_serial_driver cp2101_device = {
  78         .driver = {
  79                 .owner =        THIS_MODULE,
  80                 .name =         "cp2101",
  81         },
  82         .id_table               = id_table,
  83         .num_interrupt_in       = 0,
  84         .num_bulk_in            = 0,
  85         .num_bulk_out           = 0,
  86         .num_ports              = 1,
  87         .open                   = cp2101_open,
  88         .close                  = cp2101_close,
  89         .break_ctl              = cp2101_break_ctl,
  90         .set_termios            = cp2101_set_termios,
  91         .tiocmget               = cp2101_tiocmget,
  92         .tiocmset               = cp2101_tiocmset,
  93         .attach                 = cp2101_startup,
  94         .shutdown               = cp2101_shutdown,
  95 };
  96
  97 /* Config request types */
  98 #define REQTYPE_HOST_TO_DEVICE  0x41
  99 #define REQTYPE_DEVICE_TO_HOST  0xc1
 100
 101 /* Config SET requests. To GET, add 1 to the request number */
 102 #define CP2101_UART             0x00    /* Enable / Disable */
 103 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 104 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 105 #define CP2101_BREAK            0x05    /* On / Off */
 106 #define CP2101_CONTROL          0x07    /* Flow control line states */
 107 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 108 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 109
 110 /* CP2101_UART */
 111 #define UART_ENABLE             0x0001
 112 #define UART_DISABLE            0x0000
 113
 114 /* CP2101_BAUDRATE */
 115 #define BAUD_RATE_GEN_FREQ      0x384000
 116
 117 /* CP2101_BITS */
 118 #define BITS_DATA_MASK          0X0f00
 119 #define BITS_DATA_5             0X0500
 120 #define BITS_DATA_6             0X0600
 121 #define BITS_DATA_7             0X0700
 122 #define BITS_DATA_8             0X0800
 123 #define BITS_DATA_9             0X0900
 124
 125 #define BITS_PARITY_MASK        0x00f0
 126 #define BITS_PARITY_NONE        0x0000
 127 #define BITS_PARITY_ODD         0x0010
 128 #define BITS_PARITY_EVEN        0x0020
 129 #define BITS_PARITY_MARK        0x0030
 130 #define BITS_PARITY_SPACE       0x0040
 131
 132 #define BITS_STOP_MASK          0x000f
 133 #define BITS_STOP_1             0x0000
 134 #define BITS_STOP_1_5           0x0001
 135 #define BITS_STOP_2             0x0002
 136
 137 /* CP2101_BREAK */
 138 #define BREAK_ON                0x0000
 139 #define BREAK_OFF               0x0001
 140
 141 /* CP2101_CONTROL */
 142 #define CONTROL_DTR             0x0001
 143 #define CONTROL_RTS             0x0002
 144 #define CONTROL_CTS             0x0010
 145 #define CONTROL_DSR             0x0020
 146 #define CONTROL_RING            0x0040
 147 #define CONTROL_DCD             0x0080
 148 #define CONTROL_WRITE_DTR       0x0100
 149 #define CONTROL_WRITE_RTS       0x0200
 150
 151 /*
 152  * cp2101_get_config
 153  * Reads from the CP2101 configuration registers
 154  * 'size' is specified in bytes.
 155  * 'data' is a pointer to a pre-allocated array of integers large
 156  * enough to hold 'size' bytes (with 4 bytes to each integer)
 157  */
 158 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 159                 unsigned int *data, int size)
 160 {
 161         struct usb_serial *serial = port->serial;
 162         u32 *buf;
 163         int result, i, length;
 164
 165         /* Number of integers required to contain the array */
 166         length = (((size - 1) | 3) + 1)/4;
 167
 168         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
 169         memset(buf, 0, length * sizeof(u32));
 170
 171         if (!buf) {
 172                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 173                 return -ENOMEM;
 174         }
 175
 176         /* For get requests, the request number must be incremented */
 177         request++;
 178
 179         /* Issue the request, attempting to read 'size' bytes */
 180         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 181                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 182                                 0, buf, size, 300);
 183
 184         /* Convert data into an array of integers */
 185         for (i=0; i<length; i++)
 186                 data[i] = le32_to_cpu(buf[i]);
 187
 188         kfree(buf);
 189
 190         if (result != size) {
 191                 dev_err(&port->dev, "%s - Unable to send config request, "
 192                                 "request=0x%x size=%d result=%d\n",
 193                                 __FUNCTION__, request, size, result);
 194                 return -EPROTO;
 195         }
 196
 197         return 0;
 198 }
 199
 200 /*
 201  * cp2101_set_config
 202  * Writes to the CP2101 configuration registers
 203  * Values less than 16 bits wide are sent directly
 204  * 'size' is specified in bytes.
 205  */
 206 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 207                 unsigned int *data, int size)
 208 {
 209         struct usb_serial *serial = port->serial;
 210         u32 *buf;
 211         int result, i, length;
 212
 213         /* Number of integers required to contain the array */
 214         length = (((size - 1) | 3) + 1)/4;
 215
 216         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 217         if (!buf) {
 218                 dev_err(&port->dev, "%s - out of memory.\n",
 219                                 __FUNCTION__);
 220                 return -ENOMEM;
 221         }
 222
 223         /* Array of integers into bytes */
 224         for (i = 0; i < length; i++)
 225                 buf[i] = cpu_to_le32(data[i]);
 226
 227         if (size > 2) {
 228                 result = usb_control_msg (serial->dev,
 229                                 usb_sndctrlpipe(serial->dev, 0),
 230                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 231                                 0, buf, size, 300);
 232         } else {
 233                 result = usb_control_msg (serial->dev,
 234                                 usb_sndctrlpipe(serial->dev, 0),
 235                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 236                                 0, NULL, 0, 300);
 237         }
 238
 239         kfree(buf);
 240
 241         if ((size > 2 && result != size) || result < 0) {
 242                 dev_err(&port->dev, "%s - Unable to send request, "
 243                                 "request=0x%x size=%d result=%d\n",
 244                                 __FUNCTION__, request, size, result);
 245                 return -EPROTO;
 246         }
 247
 248         /* Single data value */
 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         return 0;
 254 }
 255
 256 /*
 257  * cp2101_set_config_single
 258  * Convenience function for calling cp2101_set_config on single data values
 259  * without requiring an integer pointer
 260  */
 261 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 262                 u8 request, unsigned int data)
 263 {
 264         return cp2101_set_config(port, request, &data, 2);
 265 }
 266
 267 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 268 {
 269         struct usb_serial *serial = port->serial;
 270         int result;
 271
 272         dbg("%s - port %d", __FUNCTION__, port->number);
 273
 274         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 275                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 276                                 __FUNCTION__);
 277                 return -EPROTO;
 278         }
 279
 280         /* Start reading from the device */
 281         usb_fill_bulk_urb (port->read_urb, serial->dev,
 282                         usb_rcvbulkpipe(serial->dev,
 283                         port->bulk_in_endpointAddress),
 284                         port->read_urb->transfer_buffer,
 285                         port->read_urb->transfer_buffer_length,
 286                         serial->type->read_bulk_callback,
 287                         port);
 288         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 289         if (result) {
 290                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 291                                 "error %d\n", __FUNCTION__, result);
 292                 return result;
 293         }
 294
 295         /* Configure the termios structure */
 296         cp2101_get_termios(port);
 297
 298         /* Set the DTR and RTS pins low */
 299         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 300
 301         return 0;
 302 }
 303
 304 static void cp2101_cleanup (struct usb_serial_port *port)
 305 {
 306         struct usb_serial *serial = port->serial;
 307
 308         dbg("%s - port %d", __FUNCTION__, port->number);
 309
 310         if (serial->dev) {
 311                 /* shutdown any bulk reads that might be going on */
 312                 if (serial->num_bulk_out)
 313                         usb_kill_urb(port->write_urb);
 314                 if (serial->num_bulk_in)
 315                         usb_kill_urb(port->read_urb);
 316         }
 317 }
 318
 319 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 320 {
 321         dbg("%s - port %d", __FUNCTION__, port->number);
 322
 323         /* shutdown our urbs */
 324         dbg("%s - shutting down urbs", __FUNCTION__);
 325         usb_kill_urb(port->write_urb);
 326         usb_kill_urb(port->read_urb);
 327
 328         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 329 }
 330
 331 /*
 332  * cp2101_get_termios
 333  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 334  * from the device, corrects any unsupported values, and configures the
 335  * termios structure to reflect the state of the device
 336  */
 337 static void cp2101_get_termios (struct usb_serial_port *port)
 338 {
 339         unsigned int cflag, modem_ctl[4];
 340         int baud;
 341         int bits;
 342
 343         dbg("%s - port %d", __FUNCTION__, port->number);
 344
 345         if ((!port->tty) || (!port->tty->termios)) {
 346                 dbg("%s - no tty structures", __FUNCTION__);
 347                 return;
 348         }
 349         cflag = port->tty->termios->c_cflag;
 350
 351         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 352         /* Convert to baudrate */
 353         if (baud)
 354                 baud = BAUD_RATE_GEN_FREQ / baud;
 355
 356         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 357         cflag &= ~CBAUD;
 358         switch (baud) {
 359                 /*
 360                  * The baud rates which are commented out below
 361                  * appear to be supported by the device
 362                  * but are non-standard
 363                  */
 364                 case 600:       cflag |= B600;          break;
 365                 case 1200:      cflag |= B1200;         break;
 366                 case 1800:      cflag |= B1800;         break;
 367                 case 2400:      cflag |= B2400;         break;
 368                 case 4800:      cflag |= B4800;         break;
 369                 /*case 7200:    cflag |= B7200;         break;*/
 370                 case 9600:      cflag |= B9600;         break;
 371                 /*case 14400:   cflag |= B14400;        break;*/
 372                 case 19200:     cflag |= B19200;        break;
 373                 /*case 28800:   cflag |= B28800;        break;*/
 374                 case 38400:     cflag |= B38400;        break;
 375                 /*case 55854:   cflag |= B55054;        break;*/
 376                 case 57600:     cflag |= B57600;        break;
 377                 case 115200:    cflag |= B115200;       break;
 378                 /*case 127117:  cflag |= B127117;       break;*/
 379                 case 230400:    cflag |= B230400;       break;
 380                 case 460800:    cflag |= B460800;       break;
 381                 case 921600:    cflag |= B921600;       break;
 382                 /*case 3686400: cflag |= B3686400;      break;*/
 383                 default:
 384                         dbg("%s - Baud rate is not supported, "
 385                                         "using 9600 baud", __FUNCTION__);
 386                         cflag |= B9600;
 387                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 388                                         (BAUD_RATE_GEN_FREQ/9600));
 389                         break;
 390         }
 391
 392         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 393         cflag &= ~CSIZE;
 394         switch(bits & BITS_DATA_MASK) {
 395                 case BITS_DATA_5:
 396                         dbg("%s - data bits = 5", __FUNCTION__);
 397                         cflag |= CS5;
 398                         break;
 399                 case BITS_DATA_6:
 400                         dbg("%s - data bits = 6", __FUNCTION__);
 401                         cflag |= CS6;
 402                         break;
 403                 case BITS_DATA_7:
 404                         dbg("%s - data bits = 7", __FUNCTION__);
 405                         cflag |= CS7;
 406                         break;
 407                 case BITS_DATA_8:
 408                         dbg("%s - data bits = 8", __FUNCTION__);
 409                         cflag |= CS8;
 410                         break;
 411                 case BITS_DATA_9:
 412                         dbg("%s - data bits = 9 (not supported, "
 413                                         "using 8 data bits)", __FUNCTION__);
 414                         cflag |= CS8;
 415                         bits &= ~BITS_DATA_MASK;
 416                         bits |= BITS_DATA_8;
 417                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 418                         break;
 419                 default:
 420                         dbg("%s - Unknown number of data bits, "
 421                                         "using 8", __FUNCTION__);
 422                         cflag |= CS8;
 423                         bits &= ~BITS_DATA_MASK;
 424                         bits |= BITS_DATA_8;
 425                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 426                         break;
 427         }
 428
 429         switch(bits & BITS_PARITY_MASK) {
 430                 case BITS_PARITY_NONE:
 431                         dbg("%s - parity = NONE", __FUNCTION__);
 432                         cflag &= ~PARENB;
 433                         break;
 434                 case BITS_PARITY_ODD:
 435                         dbg("%s - parity = ODD", __FUNCTION__);
 436                         cflag |= (PARENB|PARODD);
 437                         break;
 438                 case BITS_PARITY_EVEN:
 439                         dbg("%s - parity = EVEN", __FUNCTION__);
 440                         cflag &= ~PARODD;
 441                         cflag |= PARENB;
 442                         break;
 443                 case BITS_PARITY_MARK:
 444                         dbg("%s - parity = MARK (not supported, "
 445                                         "disabling parity)", __FUNCTION__);
 446                         cflag &= ~PARENB;
 447                         bits &= ~BITS_PARITY_MASK;
 448                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 449                         break;
 450                 case BITS_PARITY_SPACE:
 451                         dbg("%s - parity = SPACE (not supported, "
 452                                         "disabling parity)", __FUNCTION__);
 453                         cflag &= ~PARENB;
 454                         bits &= ~BITS_PARITY_MASK;
 455                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 456                         break;
 457                 default:
 458                         dbg("%s - Unknown parity mode, "
 459                                         "disabling parity", __FUNCTION__);
 460                         cflag &= ~PARENB;
 461                         bits &= ~BITS_PARITY_MASK;
 462                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 463                         break;
 464         }
 465
 466         cflag &= ~CSTOPB;
 467         switch(bits & BITS_STOP_MASK) {
 468                 case BITS_STOP_1:
 469                         dbg("%s - stop bits = 1", __FUNCTION__);
 470                         break;
 471                 case BITS_STOP_1_5:
 472                         dbg("%s - stop bits = 1.5 (not supported, "
 473                                         "using 1 stop bit)", __FUNCTION__);
 474                         bits &= ~BITS_STOP_MASK;
 475                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 476                         break;
 477                 case BITS_STOP_2:
 478                         dbg("%s - stop bits = 2", __FUNCTION__);
 479                         cflag |= CSTOPB;
 480                         break;
 481                 default:
 482                         dbg("%s - Unknown number of stop bits, "
 483                                         "using 1 stop bit", __FUNCTION__);
 484                         bits &= ~BITS_STOP_MASK;
 485                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 486                         break;
 487         }
 488
 489         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 490         if (modem_ctl[0] & 0x0008) {
 491                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 492                 cflag |= CRTSCTS;
 493         } else {
 494                 dbg("%s - flow control = NONE", __FUNCTION__);
 495                 cflag &= ~CRTSCTS;
 496         }
 497
 498         port->tty->termios->c_cflag = cflag;
 499 }
 500
 501 static void cp2101_set_termios (struct usb_serial_port *port,
 502                 struct termios *old_termios)
 503 {
 504         unsigned int cflag, old_cflag=0;
 505         int baud=0, bits;
 506         unsigned int modem_ctl[4];
 507
 508         dbg("%s - port %d", __FUNCTION__, port->number);
 509
 510         if ((!port->tty) || (!port->tty->termios)) {
 511                 dbg("%s - no tty structures", __FUNCTION__);
 512                 return;
 513         }
 514         cflag = port->tty->termios->c_cflag;
 515
 516         /* Check that they really want us to change something */
 517         if (old_termios) {
 518                 if ((cflag == old_termios->c_cflag) &&
 519                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 520                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 521                         dbg("%s - nothing to change...", __FUNCTION__);
 522                         return;
 523                 }
 524
 525                 old_cflag = old_termios->c_cflag;
 526         }
 527
 528         /* If the baud rate is to be updated*/
 529         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 530                 switch (cflag & CBAUD) {
 531                         /*
 532                          * The baud rates which are commented out below
 533                          * appear to be supported by the device
 534                          * but are non-standard
 535                          */
 536                         case B0:        baud = 0;       break;
 537                         case B600:      baud = 600;     break;
 538                         case B1200:     baud = 1200;    break;
 539                         case B1800:     baud = 1800;    break;
 540                         case B2400:     baud = 2400;    break;
 541                         case B4800:     baud = 4800;    break;
 542                         /*case B7200:   baud = 7200;    break;*/
 543                         case B9600:     baud = 9600;    break;
 544                         /*ase B14400:   baud = 14400;   break;*/
 545                         case B19200:    baud = 19200;   break;
 546                         /*case B28800:  baud = 28800;   break;*/
 547                         case B38400:    baud = 38400;   break;
 548                         /*case B55854:  baud = 55054;   break;*/
 549                         case B57600:    baud = 57600;   break;
 550                         case B115200:   baud = 115200;  break;
 551                         /*case B127117: baud = 127117;  break;*/
 552                         case B230400:   baud = 230400;  break;
 553                         case B460800:   baud = 460800;  break;
 554                         case B921600:   baud = 921600;  break;
 555                         /*case B3686400:        baud = 3686400; break;*/
 556                         default:
 557                                 dev_err(&port->dev, "cp2101 driver does not "
 558                                         "support the baudrate requested\n");
 559                                 break;
 560                 }
 561
 562                 if (baud) {
 563                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 564                                         baud);
 565                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 566                                                 (BAUD_RATE_GEN_FREQ / baud)))
 567                                 dev_err(&port->dev, "Baud rate requested not "
 568                                                 "supported by device\n");
 569                 }
 570         }
 571
 572         /* If the number of data bits is to be updated */
 573         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 574                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 575                 bits &= ~BITS_DATA_MASK;
 576                 switch (cflag & CSIZE) {
 577                         case CS5:
 578                                 bits |= BITS_DATA_5;
 579                                 dbg("%s - data bits = 5", __FUNCTION__);
 580                                 break;
 581                         case CS6:
 582                                 bits |= BITS_DATA_6;
 583                                 dbg("%s - data bits = 6", __FUNCTION__);
 584                                 break;
 585                         case CS7:
 586                                 bits |= BITS_DATA_7;
 587                                 dbg("%s - data bits = 7", __FUNCTION__);
 588                                 break;
 589                         case CS8:
 590                                 bits |= BITS_DATA_8;
 591                                 dbg("%s - data bits = 8", __FUNCTION__);
 592                                 break;
 593                         /*case CS9:
 594                                 bits |= BITS_DATA_9;
 595                                 dbg("%s - data bits = 9", __FUNCTION__);
 596                                 break;*/
 597                         default:
 598                                 dev_err(&port->dev, "cp2101 driver does not "
 599                                         "support the number of bits requested,"
 600                                         " using 8 bit mode\n");
 601                                 bits |= BITS_DATA_8;
 602                                 break;
 603                 }
 604                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 605                         dev_err(&port->dev, "Number of data bits requested "
 606                                         "not supported by device\n");
 607         }
 608
 609         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 610                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 611                 bits &= ~BITS_PARITY_MASK;
 612                 if (cflag & PARENB) {
 613                         if (cflag & PARODD) {
 614                                 bits |= BITS_PARITY_ODD;
 615                                 dbg("%s - parity = ODD", __FUNCTION__);
 616                         } else {
 617                                 bits |= BITS_PARITY_EVEN;
 618                                 dbg("%s - parity = EVEN", __FUNCTION__);
 619                         }
 620                 }
 621                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 622                         dev_err(&port->dev, "Parity mode not supported "
 623                                         "by device\n");
 624         }
 625
 626         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 627                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 628                 bits &= ~BITS_STOP_MASK;
 629                 if (cflag & CSTOPB) {
 630                         bits |= BITS_STOP_2;
 631                         dbg("%s - stop bits = 2", __FUNCTION__);
 632                 } else {
 633                         bits |= BITS_STOP_1;
 634                         dbg("%s - stop bits = 1", __FUNCTION__);
 635                 }
 636                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 637                         dev_err(&port->dev, "Number of stop bits requested "
 638                                         "not supported by device\n");
 639         }
 640
 641         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 642                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 643                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 644                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 645                                 modem_ctl[2], modem_ctl[3]);
 646
 647                 if (cflag & CRTSCTS) {
 648                         modem_ctl[0] &= ~0x7B;
 649                         modem_ctl[0] |= 0x09;
 650                         modem_ctl[1] = 0x80;
 651                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 652                 } else {
 653                         modem_ctl[0] &= ~0x7B;
 654                         modem_ctl[0] |= 0x01;
 655                         modem_ctl[1] |= 0x40;
 656                         dbg("%s - flow control = NONE", __FUNCTION__);
 657                 }
 658
 659                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 660                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 661                                 modem_ctl[2], modem_ctl[3]);
 662                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 663         }
 664
 665 }
 666
 667 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 668                 unsigned int set, unsigned int clear)
 669 {
 670         int control = 0;
 671
 672         dbg("%s - port %d", __FUNCTION__, port->number);
 673
 674         if (set & TIOCM_RTS) {
 675                 control |= CONTROL_RTS;
 676                 control |= CONTROL_WRITE_RTS;
 677         }
 678         if (set & TIOCM_DTR) {
 679                 control |= CONTROL_DTR;
 680                 control |= CONTROL_WRITE_DTR;
 681         }
 682         if (clear & TIOCM_RTS) {
 683                 control &= ~CONTROL_RTS;
 684                 control |= CONTROL_WRITE_RTS;
 685         }
 686         if (clear & TIOCM_DTR) {
 687                 control &= ~CONTROL_DTR;
 688                 control |= CONTROL_WRITE_DTR;
 689         }
 690
 691         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 692
 693         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 694
 695 }
 696
 697 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 698 {
 699         int control, result;
 700
 701         dbg("%s - port %d", __FUNCTION__, port->number);
 702
 703         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 704
 705         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 706                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 707                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 708                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 709                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 710                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 711
 712         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 713
 714         return result;
 715 }
 716
 717 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 718 {
 719         int state;
 720
 721         dbg("%s - port %d", __FUNCTION__, port->number);
 722         if (break_state == 0)
 723                 state = BREAK_OFF;
 724         else
 725                 state = BREAK_ON;
 726         dbg("%s - turning break %s", __FUNCTION__,
 727                         state==BREAK_OFF ? "off" : "on");
 728         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 729 }
 730
 731 static int cp2101_startup (struct usb_serial *serial)
 732 {
 733         /* CP2101 buffers behave strangely unless device is reset */
 734         usb_reset_device(serial->dev);
 735         return 0;
 736 }
 737
 738 static void cp2101_shutdown (struct usb_serial *serial)
 739 {
 740         int i;
 741
 742         dbg("%s", __FUNCTION__);
 743
 744         /* Stop reads and writes on all ports */
 745         for (i=0; i < serial->num_ports; ++i) {
 746                 cp2101_cleanup(serial->port[i]);
 747         }
 748 }
 749
 750 static int __init cp2101_init (void)
 751 {
 752         int retval;
 753
 754         retval = usb_serial_register(&cp2101_device);
 755         if (retval)
 756                 return retval; /* Failed to register */
 757
 758         retval = usb_register(&cp2101_driver);
 759         if (retval) {
 760                 /* Failed to register */
 761                 usb_serial_deregister(&cp2101_device);
 762                 return retval;
 763         }
 764
 765         /* Success */
 766         info(DRIVER_DESC " " DRIVER_VERSION);
 767         return 0;
 768 }
 769
 770 static void __exit cp2101_exit (void)
 771 {
 772         usb_deregister (&cp2101_driver);
 773         usb_serial_deregister (&cp2101_device);
 774 }
 775
 776 module_init(cp2101_init);
 777 module_exit(cp2101_exit);
 778
 779 MODULE_DESCRIPTION(DRIVER_DESC);
 780 MODULE_VERSION(DRIVER_VERSION);
 781 MODULE_LICENSE("GPL");
 782
 783 module_param(debug, bool, S_IRUGO | S_IWUSR);
 784 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");