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, 0x8053) }, /* Enfora EDG1228 */
  62         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  63         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  64         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  65         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  66         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  67         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  68         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  69         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  70         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  71         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  72         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  73         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  74         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  75         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  76         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  77         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  78         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  79         { } /* Terminating Entry */
  80 };
  81
  82 MODULE_DEVICE_TABLE (usb, id_table);
  83
  84 static struct usb_driver cp2101_driver = {
  85         .name           = "cp2101",
  86         .probe          = usb_serial_probe,
  87         .disconnect     = usb_serial_disconnect,
  88         .id_table       = id_table,
  89         .no_dynamic_id  =       1,
  90 };
  91
  92 static struct usb_serial_driver cp2101_device = {
  93         .driver = {
  94                 .owner =        THIS_MODULE,
  95                 .name =         "cp2101",
  96         },
  97         .usb_driver             = &cp2101_driver,
  98         .id_table               = id_table,
  99         .num_interrupt_in       = 0,
 100         .num_bulk_in            = 0,
 101         .num_bulk_out           = 0,
 102         .num_ports              = 1,
 103         .open                   = cp2101_open,
 104         .close                  = cp2101_close,
 105         .break_ctl              = cp2101_break_ctl,
 106         .set_termios            = cp2101_set_termios,
 107         .tiocmget               = cp2101_tiocmget,
 108         .tiocmset               = cp2101_tiocmset,
 109         .attach                 = cp2101_startup,
 110         .shutdown               = cp2101_shutdown,
 111 };
 112
 113 /* Config request types */
 114 #define REQTYPE_HOST_TO_DEVICE  0x41
 115 #define REQTYPE_DEVICE_TO_HOST  0xc1
 116
 117 /* Config SET requests. To GET, add 1 to the request number */
 118 #define CP2101_UART             0x00    /* Enable / Disable */
 119 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 120 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 121 #define CP2101_BREAK            0x05    /* On / Off */
 122 #define CP2101_CONTROL          0x07    /* Flow control line states */
 123 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 124 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 125
 126 /* CP2101_UART */
 127 #define UART_ENABLE             0x0001
 128 #define UART_DISABLE            0x0000
 129
 130 /* CP2101_BAUDRATE */
 131 #define BAUD_RATE_GEN_FREQ      0x384000
 132
 133 /* CP2101_BITS */
 134 #define BITS_DATA_MASK          0X0f00
 135 #define BITS_DATA_5             0X0500
 136 #define BITS_DATA_6             0X0600
 137 #define BITS_DATA_7             0X0700
 138 #define BITS_DATA_8             0X0800
 139 #define BITS_DATA_9             0X0900
 140
 141 #define BITS_PARITY_MASK        0x00f0
 142 #define BITS_PARITY_NONE        0x0000
 143 #define BITS_PARITY_ODD         0x0010
 144 #define BITS_PARITY_EVEN        0x0020
 145 #define BITS_PARITY_MARK        0x0030
 146 #define BITS_PARITY_SPACE       0x0040
 147
 148 #define BITS_STOP_MASK          0x000f
 149 #define BITS_STOP_1             0x0000
 150 #define BITS_STOP_1_5           0x0001
 151 #define BITS_STOP_2             0x0002
 152
 153 /* CP2101_BREAK */
 154 #define BREAK_ON                0x0000
 155 #define BREAK_OFF               0x0001
 156
 157 /* CP2101_CONTROL */
 158 #define CONTROL_DTR             0x0001
 159 #define CONTROL_RTS             0x0002
 160 #define CONTROL_CTS             0x0010
 161 #define CONTROL_DSR             0x0020
 162 #define CONTROL_RING            0x0040
 163 #define CONTROL_DCD             0x0080
 164 #define CONTROL_WRITE_DTR       0x0100
 165 #define CONTROL_WRITE_RTS       0x0200
 166
 167 /*
 168  * cp2101_get_config
 169  * Reads from the CP2101 configuration registers
 170  * 'size' is specified in bytes.
 171  * 'data' is a pointer to a pre-allocated array of integers large
 172  * enough to hold 'size' bytes (with 4 bytes to each integer)
 173  */
 174 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 175                 unsigned int *data, int size)
 176 {
 177         struct usb_serial *serial = port->serial;
 178         __le32 *buf;
 179         int result, i, length;
 180
 181         /* Number of integers required to contain the array */
 182         length = (((size - 1) | 3) + 1)/4;
 183
 184         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 185         if (!buf) {
 186                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 187                 return -ENOMEM;
 188         }
 189
 190         /* For get requests, the request number must be incremented */
 191         request++;
 192
 193         /* Issue the request, attempting to read 'size' bytes */
 194         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 195                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 196                                 0, buf, size, 300);
 197
 198         /* Convert data into an array of integers */
 199         for (i=0; i<length; i++)
 200                 data[i] = le32_to_cpu(buf[i]);
 201
 202         kfree(buf);
 203
 204         if (result != size) {
 205                 dev_err(&port->dev, "%s - Unable to send config request, "
 206                                 "request=0x%x size=%d result=%d\n",
 207                                 __FUNCTION__, request, size, result);
 208                 return -EPROTO;
 209         }
 210
 211         return 0;
 212 }
 213
 214 /*
 215  * cp2101_set_config
 216  * Writes to the CP2101 configuration registers
 217  * Values less than 16 bits wide are sent directly
 218  * 'size' is specified in bytes.
 219  */
 220 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 221                 unsigned int *data, int size)
 222 {
 223         struct usb_serial *serial = port->serial;
 224         __le32 *buf;
 225         int result, i, length;
 226
 227         /* Number of integers required to contain the array */
 228         length = (((size - 1) | 3) + 1)/4;
 229
 230         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 231         if (!buf) {
 232                 dev_err(&port->dev, "%s - out of memory.\n",
 233                                 __FUNCTION__);
 234                 return -ENOMEM;
 235         }
 236
 237         /* Array of integers into bytes */
 238         for (i = 0; i < length; i++)
 239                 buf[i] = cpu_to_le32(data[i]);
 240
 241         if (size > 2) {
 242                 result = usb_control_msg (serial->dev,
 243                                 usb_sndctrlpipe(serial->dev, 0),
 244                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 245                                 0, buf, size, 300);
 246         } else {
 247                 result = usb_control_msg (serial->dev,
 248                                 usb_sndctrlpipe(serial->dev, 0),
 249                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 250                                 0, NULL, 0, 300);
 251         }
 252
 253         kfree(buf);
 254
 255         if ((size > 2 && result != size) || result < 0) {
 256                 dev_err(&port->dev, "%s - Unable to send request, "
 257                                 "request=0x%x size=%d result=%d\n",
 258                                 __FUNCTION__, request, size, result);
 259                 return -EPROTO;
 260         }
 261
 262         /* Single data value */
 263         result = usb_control_msg (serial->dev,
 264                         usb_sndctrlpipe(serial->dev, 0),
 265                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 266                         0, NULL, 0, 300);
 267         return 0;
 268 }
 269
 270 /*
 271  * cp2101_set_config_single
 272  * Convenience function for calling cp2101_set_config on single data values
 273  * without requiring an integer pointer
 274  */
 275 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 276                 u8 request, unsigned int data)
 277 {
 278         return cp2101_set_config(port, request, &data, 2);
 279 }
 280
 281 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 282 {
 283         struct usb_serial *serial = port->serial;
 284         int result;
 285
 286         dbg("%s - port %d", __FUNCTION__, port->number);
 287
 288         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 289                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 290                                 __FUNCTION__);
 291                 return -EPROTO;
 292         }
 293
 294         /* Start reading from the device */
 295         usb_fill_bulk_urb (port->read_urb, serial->dev,
 296                         usb_rcvbulkpipe(serial->dev,
 297                         port->bulk_in_endpointAddress),
 298                         port->read_urb->transfer_buffer,
 299                         port->read_urb->transfer_buffer_length,
 300                         serial->type->read_bulk_callback,
 301                         port);
 302         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 303         if (result) {
 304                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 305                                 "error %d\n", __FUNCTION__, result);
 306                 return result;
 307         }
 308
 309         /* Configure the termios structure */
 310         cp2101_get_termios(port);
 311
 312         /* Set the DTR and RTS pins low */
 313         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 314
 315         return 0;
 316 }
 317
 318 static void cp2101_cleanup (struct usb_serial_port *port)
 319 {
 320         struct usb_serial *serial = port->serial;
 321
 322         dbg("%s - port %d", __FUNCTION__, port->number);
 323
 324         if (serial->dev) {
 325                 /* shutdown any bulk reads that might be going on */
 326                 if (serial->num_bulk_out)
 327                         usb_kill_urb(port->write_urb);
 328                 if (serial->num_bulk_in)
 329                         usb_kill_urb(port->read_urb);
 330         }
 331 }
 332
 333 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 334 {
 335         dbg("%s - port %d", __FUNCTION__, port->number);
 336
 337         /* shutdown our urbs */
 338         dbg("%s - shutting down urbs", __FUNCTION__);
 339         usb_kill_urb(port->write_urb);
 340         usb_kill_urb(port->read_urb);
 341
 342         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 343 }
 344
 345 /*
 346  * cp2101_get_termios
 347  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 348  * from the device, corrects any unsupported values, and configures the
 349  * termios structure to reflect the state of the device
 350  */
 351 static void cp2101_get_termios (struct usb_serial_port *port)
 352 {
 353         unsigned int cflag, modem_ctl[4];
 354         int baud;
 355         int bits;
 356
 357         dbg("%s - port %d", __FUNCTION__, port->number);
 358
 359         if (!port->tty || !port->tty->termios) {
 360                 dbg("%s - no tty structures", __FUNCTION__);
 361                 return;
 362         }
 363         cflag = port->tty->termios->c_cflag;
 364
 365         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 366         /* Convert to baudrate */
 367         if (baud)
 368                 baud = BAUD_RATE_GEN_FREQ / baud;
 369
 370         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 371         cflag &= ~CBAUD;
 372         switch (baud) {
 373                 /*
 374                  * The baud rates which are commented out below
 375                  * appear to be supported by the device
 376                  * but are non-standard
 377                  */
 378                 case 600:       cflag |= B600;          break;
 379                 case 1200:      cflag |= B1200;         break;
 380                 case 1800:      cflag |= B1800;         break;
 381                 case 2400:      cflag |= B2400;         break;
 382                 case 4800:      cflag |= B4800;         break;
 383                 /*case 7200:    cflag |= B7200;         break;*/
 384                 case 9600:      cflag |= B9600;         break;
 385                 /*case 14400:   cflag |= B14400;        break;*/
 386                 case 19200:     cflag |= B19200;        break;
 387                 /*case 28800:   cflag |= B28800;        break;*/
 388                 case 38400:     cflag |= B38400;        break;
 389                 /*case 55854:   cflag |= B55054;        break;*/
 390                 case 57600:     cflag |= B57600;        break;
 391                 case 115200:    cflag |= B115200;       break;
 392                 /*case 127117:  cflag |= B127117;       break;*/
 393                 case 230400:    cflag |= B230400;       break;
 394                 case 460800:    cflag |= B460800;       break;
 395                 case 921600:    cflag |= B921600;       break;
 396                 /*case 3686400: cflag |= B3686400;      break;*/
 397                 default:
 398                         dbg("%s - Baud rate is not supported, "
 399                                         "using 9600 baud", __FUNCTION__);
 400                         cflag |= B9600;
 401                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 402                                         (BAUD_RATE_GEN_FREQ/9600));
 403                         break;
 404         }
 405
 406         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 407         cflag &= ~CSIZE;
 408         switch(bits & BITS_DATA_MASK) {
 409                 case BITS_DATA_5:
 410                         dbg("%s - data bits = 5", __FUNCTION__);
 411                         cflag |= CS5;
 412                         break;
 413                 case BITS_DATA_6:
 414                         dbg("%s - data bits = 6", __FUNCTION__);
 415                         cflag |= CS6;
 416                         break;
 417                 case BITS_DATA_7:
 418                         dbg("%s - data bits = 7", __FUNCTION__);
 419                         cflag |= CS7;
 420                         break;
 421                 case BITS_DATA_8:
 422                         dbg("%s - data bits = 8", __FUNCTION__);
 423                         cflag |= CS8;
 424                         break;
 425                 case BITS_DATA_9:
 426                         dbg("%s - data bits = 9 (not supported, "
 427                                         "using 8 data bits)", __FUNCTION__);
 428                         cflag |= CS8;
 429                         bits &= ~BITS_DATA_MASK;
 430                         bits |= BITS_DATA_8;
 431                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 432                         break;
 433                 default:
 434                         dbg("%s - Unknown number of data bits, "
 435                                         "using 8", __FUNCTION__);
 436                         cflag |= CS8;
 437                         bits &= ~BITS_DATA_MASK;
 438                         bits |= BITS_DATA_8;
 439                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 440                         break;
 441         }
 442
 443         switch(bits & BITS_PARITY_MASK) {
 444                 case BITS_PARITY_NONE:
 445                         dbg("%s - parity = NONE", __FUNCTION__);
 446                         cflag &= ~PARENB;
 447                         break;
 448                 case BITS_PARITY_ODD:
 449                         dbg("%s - parity = ODD", __FUNCTION__);
 450                         cflag |= (PARENB|PARODD);
 451                         break;
 452                 case BITS_PARITY_EVEN:
 453                         dbg("%s - parity = EVEN", __FUNCTION__);
 454                         cflag &= ~PARODD;
 455                         cflag |= PARENB;
 456                         break;
 457                 case BITS_PARITY_MARK:
 458                         dbg("%s - parity = MARK (not supported, "
 459                                         "disabling parity)", __FUNCTION__);
 460                         cflag &= ~PARENB;
 461                         bits &= ~BITS_PARITY_MASK;
 462                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 463                         break;
 464                 case BITS_PARITY_SPACE:
 465                         dbg("%s - parity = SPACE (not supported, "
 466                                         "disabling parity)", __FUNCTION__);
 467                         cflag &= ~PARENB;
 468                         bits &= ~BITS_PARITY_MASK;
 469                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 470                         break;
 471                 default:
 472                         dbg("%s - Unknown parity mode, "
 473                                         "disabling parity", __FUNCTION__);
 474                         cflag &= ~PARENB;
 475                         bits &= ~BITS_PARITY_MASK;
 476                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 477                         break;
 478         }
 479
 480         cflag &= ~CSTOPB;
 481         switch(bits & BITS_STOP_MASK) {
 482                 case BITS_STOP_1:
 483                         dbg("%s - stop bits = 1", __FUNCTION__);
 484                         break;
 485                 case BITS_STOP_1_5:
 486                         dbg("%s - stop bits = 1.5 (not supported, "
 487                                         "using 1 stop bit)", __FUNCTION__);
 488                         bits &= ~BITS_STOP_MASK;
 489                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 490                         break;
 491                 case BITS_STOP_2:
 492                         dbg("%s - stop bits = 2", __FUNCTION__);
 493                         cflag |= CSTOPB;
 494                         break;
 495                 default:
 496                         dbg("%s - Unknown number of stop bits, "
 497                                         "using 1 stop bit", __FUNCTION__);
 498                         bits &= ~BITS_STOP_MASK;
 499                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 500                         break;
 501         }
 502
 503         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 504         if (modem_ctl[0] & 0x0008) {
 505                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 506                 cflag |= CRTSCTS;
 507         } else {
 508                 dbg("%s - flow control = NONE", __FUNCTION__);
 509                 cflag &= ~CRTSCTS;
 510         }
 511
 512         port->tty->termios->c_cflag = cflag;
 513 }
 514
 515 static void cp2101_set_termios (struct usb_serial_port *port,
 516                 struct ktermios *old_termios)
 517 {
 518         unsigned int cflag, old_cflag=0;
 519         int baud=0, bits;
 520         unsigned int modem_ctl[4];
 521
 522         dbg("%s - port %d", __FUNCTION__, port->number);
 523
 524         if ((!port->tty) || (!port->tty->termios)) {
 525                 dbg("%s - no tty structures", __FUNCTION__);
 526                 return;
 527         }
 528         cflag = port->tty->termios->c_cflag;
 529         old_cflag = old_termios->c_cflag;
 530         baud = tty_get_baud_rate(port->tty);
 531
 532         /* If the baud rate is to be updated*/
 533         if (baud != tty_termios_baud_rate(old_termios)) {
 534                 switch (baud) {
 535                         case 0:
 536                         case 600:
 537                         case 1200:
 538                         case 1800:
 539                         case 2400:
 540                         case 4800:
 541                         case 7200:
 542                         case 9600:
 543                         case 14400:
 544                         case 19200:
 545                         case 28800:
 546                         case 38400:
 547                         case 55854:
 548                         case 57600:
 549                         case 115200:
 550                         case 127117:
 551                         case 230400:
 552                         case 460800:
 553                         case 921600:
 554                         case 3686400:
 555                                 break;
 556                         default:
 557                                 baud = 9600;
 558                                 break;
 559                 }
 560
 561                 if (baud) {
 562                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 563                                         baud);
 564                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 565                                                 (BAUD_RATE_GEN_FREQ / baud)))
 566                                 dev_err(&port->dev, "Baud rate requested not "
 567                                                 "supported by device\n");
 568                 }
 569         }
 570
 571         /* If the number of data bits is to be updated */
 572         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 573                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 574                 bits &= ~BITS_DATA_MASK;
 575                 switch (cflag & CSIZE) {
 576                         case CS5:
 577                                 bits |= BITS_DATA_5;
 578                                 dbg("%s - data bits = 5", __FUNCTION__);
 579                                 break;
 580                         case CS6:
 581                                 bits |= BITS_DATA_6;
 582                                 dbg("%s - data bits = 6", __FUNCTION__);
 583                                 break;
 584                         case CS7:
 585                                 bits |= BITS_DATA_7;
 586                                 dbg("%s - data bits = 7", __FUNCTION__);
 587                                 break;
 588                         case CS8:
 589                                 bits |= BITS_DATA_8;
 590                                 dbg("%s - data bits = 8", __FUNCTION__);
 591                                 break;
 592                         /*case CS9:
 593                                 bits |= BITS_DATA_9;
 594                                 dbg("%s - data bits = 9", __FUNCTION__);
 595                                 break;*/
 596                         default:
 597                                 dev_err(&port->dev, "cp2101 driver does not "
 598                                         "support the number of bits requested,"
 599                                         " using 8 bit mode\n");
 600                                 bits |= BITS_DATA_8;
 601                                 break;
 602                 }
 603                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 604                         dev_err(&port->dev, "Number of data bits requested "
 605                                         "not supported by device\n");
 606         }
 607
 608         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 609                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 610                 bits &= ~BITS_PARITY_MASK;
 611                 if (cflag & PARENB) {
 612                         if (cflag & PARODD) {
 613                                 bits |= BITS_PARITY_ODD;
 614                                 dbg("%s - parity = ODD", __FUNCTION__);
 615                         } else {
 616                                 bits |= BITS_PARITY_EVEN;
 617                                 dbg("%s - parity = EVEN", __FUNCTION__);
 618                         }
 619                 }
 620                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 621                         dev_err(&port->dev, "Parity mode not supported "
 622                                         "by device\n");
 623         }
 624
 625         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 626                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 627                 bits &= ~BITS_STOP_MASK;
 628                 if (cflag & CSTOPB) {
 629                         bits |= BITS_STOP_2;
 630                         dbg("%s - stop bits = 2", __FUNCTION__);
 631                 } else {
 632                         bits |= BITS_STOP_1;
 633                         dbg("%s - stop bits = 1", __FUNCTION__);
 634                 }
 635                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 636                         dev_err(&port->dev, "Number of stop bits requested "
 637                                         "not supported by device\n");
 638         }
 639
 640         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 641                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 642                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 643                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 644                                 modem_ctl[2], modem_ctl[3]);
 645
 646                 if (cflag & CRTSCTS) {
 647                         modem_ctl[0] &= ~0x7B;
 648                         modem_ctl[0] |= 0x09;
 649                         modem_ctl[1] = 0x80;
 650                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 651                 } else {
 652                         modem_ctl[0] &= ~0x7B;
 653                         modem_ctl[0] |= 0x01;
 654                         modem_ctl[1] |= 0x40;
 655                         dbg("%s - flow control = NONE", __FUNCTION__);
 656                 }
 657
 658                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 659                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 660                                 modem_ctl[2], modem_ctl[3]);
 661                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 662         }
 663
 664 }
 665
 666 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 667                 unsigned int set, unsigned int clear)
 668 {
 669         int control = 0;
 670
 671         dbg("%s - port %d", __FUNCTION__, port->number);
 672
 673         if (set & TIOCM_RTS) {
 674                 control |= CONTROL_RTS;
 675                 control |= CONTROL_WRITE_RTS;
 676         }
 677         if (set & TIOCM_DTR) {
 678                 control |= CONTROL_DTR;
 679                 control |= CONTROL_WRITE_DTR;
 680         }
 681         if (clear & TIOCM_RTS) {
 682                 control &= ~CONTROL_RTS;
 683                 control |= CONTROL_WRITE_RTS;
 684         }
 685         if (clear & TIOCM_DTR) {
 686                 control &= ~CONTROL_DTR;
 687                 control |= CONTROL_WRITE_DTR;
 688         }
 689
 690         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 691
 692         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 693
 694 }
 695
 696 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 697 {
 698         int control, result;
 699
 700         dbg("%s - port %d", __FUNCTION__, port->number);
 701
 702         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 703
 704         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 705                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 706                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 707                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 708                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 709                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 710
 711         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 712
 713         return result;
 714 }
 715
 716 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 717 {
 718         int state;
 719
 720         dbg("%s - port %d", __FUNCTION__, port->number);
 721         if (break_state == 0)
 722                 state = BREAK_OFF;
 723         else
 724                 state = BREAK_ON;
 725         dbg("%s - turning break %s", __FUNCTION__,
 726                         state==BREAK_OFF ? "off" : "on");
 727         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 728 }
 729
 730 static int cp2101_startup (struct usb_serial *serial)
 731 {
 732         /* CP2101 buffers behave strangely unless device is reset */
 733         usb_reset_device(serial->dev);
 734         return 0;
 735 }
 736
 737 static void cp2101_shutdown (struct usb_serial *serial)
 738 {
 739         int i;
 740
 741         dbg("%s", __FUNCTION__);
 742
 743         /* Stop reads and writes on all ports */
 744         for (i=0; i < serial->num_ports; ++i) {
 745                 cp2101_cleanup(serial->port[i]);
 746         }
 747 }
 748
 749 static int __init cp2101_init (void)
 750 {
 751         int retval;
 752
 753         retval = usb_serial_register(&cp2101_device);
 754         if (retval)
 755                 return retval; /* Failed to register */
 756
 757         retval = usb_register(&cp2101_driver);
 758         if (retval) {
 759                 /* Failed to register */
 760                 usb_serial_deregister(&cp2101_device);
 761                 return retval;
 762         }
 763
 764         /* Success */
 765         info(DRIVER_DESC " " DRIVER_VERSION);
 766         return 0;
 767 }
 768
 769 static void __exit cp2101_exit (void)
 770 {
 771         usb_deregister (&cp2101_driver);
 772         usb_serial_deregister (&cp2101_device);
 773 }
 774
 775 module_init(cp2101_init);
 776 module_exit(cp2101_exit);
 777
 778 MODULE_DESCRIPTION(DRIVER_DESC);
 779 MODULE_VERSION(DRIVER_VERSION);
 780 MODULE_LICENSE("GPL");
 781
 782 module_param(debug, bool, S_IRUGO | S_IWUSR);
 783 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");