git.oblomov.eu Git - 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/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/usb.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/usb/serial.h>
  30
  31 /*
  32  * Version Information
  33  */
  34 #define DRIVER_VERSION "v0.07"
  35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  36
  37 /*
  38  * Function Prototypes
  39  */
  40 static int cp2101_open(struct usb_serial_port*, struct file*);
  41 static void cp2101_cleanup(struct usb_serial_port*);
  42 static void cp2101_close(struct usb_serial_port*, struct file*);
  43 static void cp2101_get_termios(struct usb_serial_port*);
  44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
  45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  47                 unsigned int, unsigned int);
  48 static void cp2101_break_ctl(struct usb_serial_port*, int);
  49 static int cp2101_startup (struct usb_serial *);
  50 static void cp2101_shutdown(struct usb_serial*);
  51
  52
  53 static int debug;
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(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, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  68         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  69         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  70         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  71         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  72         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  73         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  74         { } /* Terminating Entry */
  75 };
  76
  77 MODULE_DEVICE_TABLE (usb, id_table);
  78
  79 static struct usb_driver cp2101_driver = {
  80         .name           = "cp2101",
  81         .probe          = usb_serial_probe,
  82         .disconnect     = usb_serial_disconnect,
  83         .id_table       = id_table,
  84         .no_dynamic_id  =       1,
  85 };
  86
  87 static struct usb_serial_driver cp2101_device = {
  88         .driver = {
  89                 .owner =        THIS_MODULE,
  90                 .name =         "cp2101",
  91         },
  92         .usb_driver             = &cp2101_driver,
  93         .id_table               = id_table,
  94         .num_interrupt_in       = 0,
  95         .num_bulk_in            = 0,
  96         .num_bulk_out           = 0,
  97         .num_ports              = 1,
  98         .open                   = cp2101_open,
  99         .close                  = cp2101_close,
 100         .break_ctl              = cp2101_break_ctl,
 101         .set_termios            = cp2101_set_termios,
 102         .tiocmget               = cp2101_tiocmget,
 103         .tiocmset               = cp2101_tiocmset,
 104         .attach                 = cp2101_startup,
 105         .shutdown               = cp2101_shutdown,
 106 };
 107
 108 /* Config request types */
 109 #define REQTYPE_HOST_TO_DEVICE  0x41
 110 #define REQTYPE_DEVICE_TO_HOST  0xc1
 111
 112 /* Config SET requests. To GET, add 1 to the request number */
 113 #define CP2101_UART             0x00    /* Enable / Disable */
 114 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 115 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 116 #define CP2101_BREAK            0x05    /* On / Off */
 117 #define CP2101_CONTROL          0x07    /* Flow control line states */
 118 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 119 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 120
 121 /* CP2101_UART */
 122 #define UART_ENABLE             0x0001
 123 #define UART_DISABLE            0x0000
 124
 125 /* CP2101_BAUDRATE */
 126 #define BAUD_RATE_GEN_FREQ      0x384000
 127
 128 /* CP2101_BITS */
 129 #define BITS_DATA_MASK          0X0f00
 130 #define BITS_DATA_5             0X0500
 131 #define BITS_DATA_6             0X0600
 132 #define BITS_DATA_7             0X0700
 133 #define BITS_DATA_8             0X0800
 134 #define BITS_DATA_9             0X0900
 135
 136 #define BITS_PARITY_MASK        0x00f0
 137 #define BITS_PARITY_NONE        0x0000
 138 #define BITS_PARITY_ODD         0x0010
 139 #define BITS_PARITY_EVEN        0x0020
 140 #define BITS_PARITY_MARK        0x0030
 141 #define BITS_PARITY_SPACE       0x0040
 142
 143 #define BITS_STOP_MASK          0x000f
 144 #define BITS_STOP_1             0x0000
 145 #define BITS_STOP_1_5           0x0001
 146 #define BITS_STOP_2             0x0002
 147
 148 /* CP2101_BREAK */
 149 #define BREAK_ON                0x0000
 150 #define BREAK_OFF               0x0001
 151
 152 /* CP2101_CONTROL */
 153 #define CONTROL_DTR             0x0001
 154 #define CONTROL_RTS             0x0002
 155 #define CONTROL_CTS             0x0010
 156 #define CONTROL_DSR             0x0020
 157 #define CONTROL_RING            0x0040
 158 #define CONTROL_DCD             0x0080
 159 #define CONTROL_WRITE_DTR       0x0100
 160 #define CONTROL_WRITE_RTS       0x0200
 161
 162 /*
 163  * cp2101_get_config
 164  * Reads from the CP2101 configuration registers
 165  * 'size' is specified in bytes.
 166  * 'data' is a pointer to a pre-allocated array of integers large
 167  * enough to hold 'size' bytes (with 4 bytes to each integer)
 168  */
 169 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 170                 unsigned int *data, int size)
 171 {
 172         struct usb_serial *serial = port->serial;
 173         __le32 *buf;
 174         int result, i, length;
 175
 176         /* Number of integers required to contain the array */
 177         length = (((size - 1) | 3) + 1)/4;
 178
 179         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 180         if (!buf) {
 181                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 182                 return -ENOMEM;
 183         }
 184
 185         /* For get requests, the request number must be incremented */
 186         request++;
 187
 188         /* Issue the request, attempting to read 'size' bytes */
 189         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 190                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 191                                 0, buf, size, 300);
 192
 193         /* Convert data into an array of integers */
 194         for (i=0; i<length; i++)
 195                 data[i] = le32_to_cpu(buf[i]);
 196
 197         kfree(buf);
 198
 199         if (result != size) {
 200                 dev_err(&port->dev, "%s - Unable to send config request, "
 201                                 "request=0x%x size=%d result=%d\n",
 202                                 __FUNCTION__, request, size, result);
 203                 return -EPROTO;
 204         }
 205
 206         return 0;
 207 }
 208
 209 /*
 210  * cp2101_set_config
 211  * Writes to the CP2101 configuration registers
 212  * Values less than 16 bits wide are sent directly
 213  * 'size' is specified in bytes.
 214  */
 215 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 216                 unsigned int *data, int size)
 217 {
 218         struct usb_serial *serial = port->serial;
 219         __le32 *buf;
 220         int result, i, length;
 221
 222         /* Number of integers required to contain the array */
 223         length = (((size - 1) | 3) + 1)/4;
 224
 225         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 226         if (!buf) {
 227                 dev_err(&port->dev, "%s - out of memory.\n",
 228                                 __FUNCTION__);
 229                 return -ENOMEM;
 230         }
 231
 232         /* Array of integers into bytes */
 233         for (i = 0; i < length; i++)
 234                 buf[i] = cpu_to_le32(data[i]);
 235
 236         if (size > 2) {
 237                 result = usb_control_msg (serial->dev,
 238                                 usb_sndctrlpipe(serial->dev, 0),
 239                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 240                                 0, buf, size, 300);
 241         } else {
 242                 result = usb_control_msg (serial->dev,
 243                                 usb_sndctrlpipe(serial->dev, 0),
 244                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 245                                 0, NULL, 0, 300);
 246         }
 247
 248         kfree(buf);
 249
 250         if ((size > 2 && result != size) || result < 0) {
 251                 dev_err(&port->dev, "%s - Unable to send request, "
 252                                 "request=0x%x size=%d result=%d\n",
 253                                 __FUNCTION__, request, size, result);
 254                 return -EPROTO;
 255         }
 256
 257         /* Single data value */
 258         result = usb_control_msg (serial->dev,
 259                         usb_sndctrlpipe(serial->dev, 0),
 260                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 261                         0, NULL, 0, 300);
 262         return 0;
 263 }
 264
 265 /*
 266  * cp2101_set_config_single
 267  * Convenience function for calling cp2101_set_config on single data values
 268  * without requiring an integer pointer
 269  */
 270 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 271                 u8 request, unsigned int data)
 272 {
 273         return cp2101_set_config(port, request, &data, 2);
 274 }
 275
 276 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 277 {
 278         struct usb_serial *serial = port->serial;
 279         int result;
 280
 281         dbg("%s - port %d", __FUNCTION__, port->number);
 282
 283         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 284                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 285                                 __FUNCTION__);
 286                 return -EPROTO;
 287         }
 288
 289         /* Start reading from the device */
 290         usb_fill_bulk_urb (port->read_urb, serial->dev,
 291                         usb_rcvbulkpipe(serial->dev,
 292                         port->bulk_in_endpointAddress),
 293                         port->read_urb->transfer_buffer,
 294                         port->read_urb->transfer_buffer_length,
 295                         serial->type->read_bulk_callback,
 296                         port);
 297         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 298         if (result) {
 299                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 300                                 "error %d\n", __FUNCTION__, result);
 301                 return result;
 302         }
 303
 304         /* Configure the termios structure */
 305         cp2101_get_termios(port);
 306
 307         /* Set the DTR and RTS pins low */
 308         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 309
 310         return 0;
 311 }
 312
 313 static void cp2101_cleanup (struct usb_serial_port *port)
 314 {
 315         struct usb_serial *serial = port->serial;
 316
 317         dbg("%s - port %d", __FUNCTION__, port->number);
 318
 319         if (serial->dev) {
 320                 /* shutdown any bulk reads that might be going on */
 321                 if (serial->num_bulk_out)
 322                         usb_kill_urb(port->write_urb);
 323                 if (serial->num_bulk_in)
 324                         usb_kill_urb(port->read_urb);
 325         }
 326 }
 327
 328 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 329 {
 330         dbg("%s - port %d", __FUNCTION__, port->number);
 331
 332         /* shutdown our urbs */
 333         dbg("%s - shutting down urbs", __FUNCTION__);
 334         usb_kill_urb(port->write_urb);
 335         usb_kill_urb(port->read_urb);
 336
 337         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 338 }
 339
 340 /*
 341  * cp2101_get_termios
 342  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 343  * from the device, corrects any unsupported values, and configures the
 344  * termios structure to reflect the state of the device
 345  */
 346 static void cp2101_get_termios (struct usb_serial_port *port)
 347 {
 348         unsigned int cflag, modem_ctl[4];
 349         int baud;
 350         int bits;
 351
 352         dbg("%s - port %d", __FUNCTION__, port->number);
 353
 354         if ((!port->tty) || (!port->tty->termios)) {
 355                 dbg("%s - no tty structures", __FUNCTION__);
 356                 return;
 357         }
 358         cflag = port->tty->termios->c_cflag;
 359
 360         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 361         /* Convert to baudrate */
 362         if (baud)
 363                 baud = BAUD_RATE_GEN_FREQ / baud;
 364
 365         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 366         cflag &= ~CBAUD;
 367         switch (baud) {
 368                 /*
 369                  * The baud rates which are commented out below
 370                  * appear to be supported by the device
 371                  * but are non-standard
 372                  */
 373                 case 600:       cflag |= B600;          break;
 374                 case 1200:      cflag |= B1200;         break;
 375                 case 1800:      cflag |= B1800;         break;
 376                 case 2400:      cflag |= B2400;         break;
 377                 case 4800:      cflag |= B4800;         break;
 378                 /*case 7200:    cflag |= B7200;         break;*/
 379                 case 9600:      cflag |= B9600;         break;
 380                 /*case 14400:   cflag |= B14400;        break;*/
 381                 case 19200:     cflag |= B19200;        break;
 382                 /*case 28800:   cflag |= B28800;        break;*/
 383                 case 38400:     cflag |= B38400;        break;
 384                 /*case 55854:   cflag |= B55054;        break;*/
 385                 case 57600:     cflag |= B57600;        break;
 386                 case 115200:    cflag |= B115200;       break;
 387                 /*case 127117:  cflag |= B127117;       break;*/
 388                 case 230400:    cflag |= B230400;       break;
 389                 case 460800:    cflag |= B460800;       break;
 390                 case 921600:    cflag |= B921600;       break;
 391                 /*case 3686400: cflag |= B3686400;      break;*/
 392                 default:
 393                         dbg("%s - Baud rate is not supported, "
 394                                         "using 9600 baud", __FUNCTION__);
 395                         cflag |= B9600;
 396                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 397                                         (BAUD_RATE_GEN_FREQ/9600));
 398                         break;
 399         }
 400
 401         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 402         cflag &= ~CSIZE;
 403         switch(bits & BITS_DATA_MASK) {
 404                 case BITS_DATA_5:
 405                         dbg("%s - data bits = 5", __FUNCTION__);
 406                         cflag |= CS5;
 407                         break;
 408                 case BITS_DATA_6:
 409                         dbg("%s - data bits = 6", __FUNCTION__);
 410                         cflag |= CS6;
 411                         break;
 412                 case BITS_DATA_7:
 413                         dbg("%s - data bits = 7", __FUNCTION__);
 414                         cflag |= CS7;
 415                         break;
 416                 case BITS_DATA_8:
 417                         dbg("%s - data bits = 8", __FUNCTION__);
 418                         cflag |= CS8;
 419                         break;
 420                 case BITS_DATA_9:
 421                         dbg("%s - data bits = 9 (not supported, "
 422                                         "using 8 data bits)", __FUNCTION__);
 423                         cflag |= CS8;
 424                         bits &= ~BITS_DATA_MASK;
 425                         bits |= BITS_DATA_8;
 426                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 427                         break;
 428                 default:
 429                         dbg("%s - Unknown number of data bits, "
 430                                         "using 8", __FUNCTION__);
 431                         cflag |= CS8;
 432                         bits &= ~BITS_DATA_MASK;
 433                         bits |= BITS_DATA_8;
 434                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 435                         break;
 436         }
 437
 438         switch(bits & BITS_PARITY_MASK) {
 439                 case BITS_PARITY_NONE:
 440                         dbg("%s - parity = NONE", __FUNCTION__);
 441                         cflag &= ~PARENB;
 442                         break;
 443                 case BITS_PARITY_ODD:
 444                         dbg("%s - parity = ODD", __FUNCTION__);
 445                         cflag |= (PARENB|PARODD);
 446                         break;
 447                 case BITS_PARITY_EVEN:
 448                         dbg("%s - parity = EVEN", __FUNCTION__);
 449                         cflag &= ~PARODD;
 450                         cflag |= PARENB;
 451                         break;
 452                 case BITS_PARITY_MARK:
 453                         dbg("%s - parity = MARK (not supported, "
 454                                         "disabling parity)", __FUNCTION__);
 455                         cflag &= ~PARENB;
 456                         bits &= ~BITS_PARITY_MASK;
 457                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 458                         break;
 459                 case BITS_PARITY_SPACE:
 460                         dbg("%s - parity = SPACE (not supported, "
 461                                         "disabling parity)", __FUNCTION__);
 462                         cflag &= ~PARENB;
 463                         bits &= ~BITS_PARITY_MASK;
 464                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 465                         break;
 466                 default:
 467                         dbg("%s - Unknown parity mode, "
 468                                         "disabling parity", __FUNCTION__);
 469                         cflag &= ~PARENB;
 470                         bits &= ~BITS_PARITY_MASK;
 471                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 472                         break;
 473         }
 474
 475         cflag &= ~CSTOPB;
 476         switch(bits & BITS_STOP_MASK) {
 477                 case BITS_STOP_1:
 478                         dbg("%s - stop bits = 1", __FUNCTION__);
 479                         break;
 480                 case BITS_STOP_1_5:
 481                         dbg("%s - stop bits = 1.5 (not supported, "
 482                                         "using 1 stop bit)", __FUNCTION__);
 483                         bits &= ~BITS_STOP_MASK;
 484                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 485                         break;
 486                 case BITS_STOP_2:
 487                         dbg("%s - stop bits = 2", __FUNCTION__);
 488                         cflag |= CSTOPB;
 489                         break;
 490                 default:
 491                         dbg("%s - Unknown number of stop bits, "
 492                                         "using 1 stop bit", __FUNCTION__);
 493                         bits &= ~BITS_STOP_MASK;
 494                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 495                         break;
 496         }
 497
 498         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 499         if (modem_ctl[0] & 0x0008) {
 500                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 501                 cflag |= CRTSCTS;
 502         } else {
 503                 dbg("%s - flow control = NONE", __FUNCTION__);
 504                 cflag &= ~CRTSCTS;
 505         }
 506
 507         port->tty->termios->c_cflag = cflag;
 508 }
 509
 510 static void cp2101_set_termios (struct usb_serial_port *port,
 511                 struct ktermios *old_termios)
 512 {
 513         unsigned int cflag, old_cflag=0;
 514         int baud=0, bits;
 515         unsigned int modem_ctl[4];
 516
 517         dbg("%s - port %d", __FUNCTION__, port->number);
 518
 519         if ((!port->tty) || (!port->tty->termios)) {
 520                 dbg("%s - no tty structures", __FUNCTION__);
 521                 return;
 522         }
 523         cflag = port->tty->termios->c_cflag;
 524
 525         /* Check that they really want us to change something */
 526         if (old_termios) {
 527                 if ((cflag == old_termios->c_cflag) &&
 528                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 529                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 530                         dbg("%s - nothing to change...", __FUNCTION__);
 531                         return;
 532                 }
 533
 534                 old_cflag = old_termios->c_cflag;
 535         }
 536
 537         /* If the baud rate is to be updated*/
 538         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 539                 switch (cflag & CBAUD) {
 540                         /*
 541                          * The baud rates which are commented out below
 542                          * appear to be supported by the device
 543                          * but are non-standard
 544                          */
 545                         case B0:        baud = 0;       break;
 546                         case B600:      baud = 600;     break;
 547                         case B1200:     baud = 1200;    break;
 548                         case B1800:     baud = 1800;    break;
 549                         case B2400:     baud = 2400;    break;
 550                         case B4800:     baud = 4800;    break;
 551                         /*case B7200:   baud = 7200;    break;*/
 552                         case B9600:     baud = 9600;    break;
 553                         /*ase B14400:   baud = 14400;   break;*/
 554                         case B19200:    baud = 19200;   break;
 555                         /*case B28800:  baud = 28800;   break;*/
 556                         case B38400:    baud = 38400;   break;
 557                         /*case B55854:  baud = 55054;   break;*/
 558                         case B57600:    baud = 57600;   break;
 559                         case B115200:   baud = 115200;  break;
 560                         /*case B127117: baud = 127117;  break;*/
 561                         case B230400:   baud = 230400;  break;
 562                         case B460800:   baud = 460800;  break;
 563                         case B921600:   baud = 921600;  break;
 564                         /*case B3686400:        baud = 3686400; break;*/
 565                         default:
 566                                 dev_err(&port->dev, "cp2101 driver does not "
 567                                         "support the baudrate requested\n");
 568                                 break;
 569                 }
 570
 571                 if (baud) {
 572                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 573                                         baud);
 574                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 575                                                 (BAUD_RATE_GEN_FREQ / baud)))
 576                                 dev_err(&port->dev, "Baud rate requested not "
 577                                                 "supported by device\n");
 578                 }
 579         }
 580
 581         /* If the number of data bits is to be updated */
 582         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 583                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 584                 bits &= ~BITS_DATA_MASK;
 585                 switch (cflag & CSIZE) {
 586                         case CS5:
 587                                 bits |= BITS_DATA_5;
 588                                 dbg("%s - data bits = 5", __FUNCTION__);
 589                                 break;
 590                         case CS6:
 591                                 bits |= BITS_DATA_6;
 592                                 dbg("%s - data bits = 6", __FUNCTION__);
 593                                 break;
 594                         case CS7:
 595                                 bits |= BITS_DATA_7;
 596                                 dbg("%s - data bits = 7", __FUNCTION__);
 597                                 break;
 598                         case CS8:
 599                                 bits |= BITS_DATA_8;
 600                                 dbg("%s - data bits = 8", __FUNCTION__);
 601                                 break;
 602                         /*case CS9:
 603                                 bits |= BITS_DATA_9;
 604                                 dbg("%s - data bits = 9", __FUNCTION__);
 605                                 break;*/
 606                         default:
 607                                 dev_err(&port->dev, "cp2101 driver does not "
 608                                         "support the number of bits requested,"
 609                                         " using 8 bit mode\n");
 610                                 bits |= BITS_DATA_8;
 611                                 break;
 612                 }
 613                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 614                         dev_err(&port->dev, "Number of data bits requested "
 615                                         "not supported by device\n");
 616         }
 617
 618         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 619                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 620                 bits &= ~BITS_PARITY_MASK;
 621                 if (cflag & PARENB) {
 622                         if (cflag & PARODD) {
 623                                 bits |= BITS_PARITY_ODD;
 624                                 dbg("%s - parity = ODD", __FUNCTION__);
 625                         } else {
 626                                 bits |= BITS_PARITY_EVEN;
 627                                 dbg("%s - parity = EVEN", __FUNCTION__);
 628                         }
 629                 }
 630                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 631                         dev_err(&port->dev, "Parity mode not supported "
 632                                         "by device\n");
 633         }
 634
 635         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 636                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 637                 bits &= ~BITS_STOP_MASK;
 638                 if (cflag & CSTOPB) {
 639                         bits |= BITS_STOP_2;
 640                         dbg("%s - stop bits = 2", __FUNCTION__);
 641                 } else {
 642                         bits |= BITS_STOP_1;
 643                         dbg("%s - stop bits = 1", __FUNCTION__);
 644                 }
 645                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 646                         dev_err(&port->dev, "Number of stop bits requested "
 647                                         "not supported by device\n");
 648         }
 649
 650         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 651                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 652                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 653                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 654                                 modem_ctl[2], modem_ctl[3]);
 655
 656                 if (cflag & CRTSCTS) {
 657                         modem_ctl[0] &= ~0x7B;
 658                         modem_ctl[0] |= 0x09;
 659                         modem_ctl[1] = 0x80;
 660                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 661                 } else {
 662                         modem_ctl[0] &= ~0x7B;
 663                         modem_ctl[0] |= 0x01;
 664                         modem_ctl[1] |= 0x40;
 665                         dbg("%s - flow control = NONE", __FUNCTION__);
 666                 }
 667
 668                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 669                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 670                                 modem_ctl[2], modem_ctl[3]);
 671                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 672         }
 673
 674 }
 675
 676 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 677                 unsigned int set, unsigned int clear)
 678 {
 679         int control = 0;
 680
 681         dbg("%s - port %d", __FUNCTION__, port->number);
 682
 683         if (set & TIOCM_RTS) {
 684                 control |= CONTROL_RTS;
 685                 control |= CONTROL_WRITE_RTS;
 686         }
 687         if (set & TIOCM_DTR) {
 688                 control |= CONTROL_DTR;
 689                 control |= CONTROL_WRITE_DTR;
 690         }
 691         if (clear & TIOCM_RTS) {
 692                 control &= ~CONTROL_RTS;
 693                 control |= CONTROL_WRITE_RTS;
 694         }
 695         if (clear & TIOCM_DTR) {
 696                 control &= ~CONTROL_DTR;
 697                 control |= CONTROL_WRITE_DTR;
 698         }
 699
 700         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 701
 702         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 703
 704 }
 705
 706 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 707 {
 708         int control, result;
 709
 710         dbg("%s - port %d", __FUNCTION__, port->number);
 711
 712         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 713
 714         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 715                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 716                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 717                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 718                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 719                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 720
 721         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 722
 723         return result;
 724 }
 725
 726 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 727 {
 728         int state;
 729
 730         dbg("%s - port %d", __FUNCTION__, port->number);
 731         if (break_state == 0)
 732                 state = BREAK_OFF;
 733         else
 734                 state = BREAK_ON;
 735         dbg("%s - turning break %s", __FUNCTION__,
 736                         state==BREAK_OFF ? "off" : "on");
 737         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 738 }
 739
 740 static int cp2101_startup (struct usb_serial *serial)
 741 {
 742         /* CP2101 buffers behave strangely unless device is reset */
 743         usb_reset_device(serial->dev);
 744         return 0;
 745 }
 746
 747 static void cp2101_shutdown (struct usb_serial *serial)
 748 {
 749         int i;
 750
 751         dbg("%s", __FUNCTION__);
 752
 753         /* Stop reads and writes on all ports */
 754         for (i=0; i < serial->num_ports; ++i) {
 755                 cp2101_cleanup(serial->port[i]);
 756         }
 757 }
 758
 759 static int __init cp2101_init (void)
 760 {
 761         int retval;
 762
 763         retval = usb_serial_register(&cp2101_device);
 764         if (retval)
 765                 return retval; /* Failed to register */
 766
 767         retval = usb_register(&cp2101_driver);
 768         if (retval) {
 769                 /* Failed to register */
 770                 usb_serial_deregister(&cp2101_device);
 771                 return retval;
 772         }
 773
 774         /* Success */
 775         info(DRIVER_DESC " " DRIVER_VERSION);
 776         return 0;
 777 }
 778
 779 static void __exit cp2101_exit (void)
 780 {
 781         usb_deregister (&cp2101_driver);
 782         usb_serial_deregister (&cp2101_device);
 783 }
 784
 785 module_init(cp2101_init);
 786 module_exit(cp2101_exit);
 787
 788 MODULE_DESCRIPTION(DRIVER_DESC);
 789 MODULE_VERSION(DRIVER_VERSION);
 790 MODULE_LICENSE("GPL");
 791
 792 module_param(debug, bool, S_IRUGO | S_IWUSR);
 793 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");