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(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  58         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  59         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  60         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  61         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  62         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  63         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  64         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  65         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  66         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  67         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  68         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  69         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  70         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  71         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  72         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  73         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  74         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  75         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  76         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  77         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  78         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  79         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  80         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  81         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  82         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  83         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
  84         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  85         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  86         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
  87         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  88         { } /* Terminating Entry */
  89 };
  90
  91 MODULE_DEVICE_TABLE (usb, id_table);
  92
  93 static struct usb_driver cp2101_driver = {
  94         .name           = "cp2101",
  95         .probe          = usb_serial_probe,
  96         .disconnect     = usb_serial_disconnect,
  97         .id_table       = id_table,
  98         .no_dynamic_id  =       1,
  99 };
 100
 101 static struct usb_serial_driver cp2101_device = {
 102         .driver = {
 103                 .owner =        THIS_MODULE,
 104                 .name =         "cp2101",
 105         },
 106         .usb_driver             = &cp2101_driver,
 107         .id_table               = id_table,
 108         .num_interrupt_in       = 0,
 109         .num_bulk_in            = NUM_DONT_CARE,
 110         .num_bulk_out           = NUM_DONT_CARE,
 111         .num_ports              = 1,
 112         .open                   = cp2101_open,
 113         .close                  = cp2101_close,
 114         .break_ctl              = cp2101_break_ctl,
 115         .set_termios            = cp2101_set_termios,
 116         .tiocmget               = cp2101_tiocmget,
 117         .tiocmset               = cp2101_tiocmset,
 118         .attach                 = cp2101_startup,
 119         .shutdown               = cp2101_shutdown,
 120 };
 121
 122 /* Config request types */
 123 #define REQTYPE_HOST_TO_DEVICE  0x41
 124 #define REQTYPE_DEVICE_TO_HOST  0xc1
 125
 126 /* Config SET requests. To GET, add 1 to the request number */
 127 #define CP2101_UART             0x00    /* Enable / Disable */
 128 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 129 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 130 #define CP2101_BREAK            0x05    /* On / Off */
 131 #define CP2101_CONTROL          0x07    /* Flow control line states */
 132 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 133 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 134
 135 /* CP2101_UART */
 136 #define UART_ENABLE             0x0001
 137 #define UART_DISABLE            0x0000
 138
 139 /* CP2101_BAUDRATE */
 140 #define BAUD_RATE_GEN_FREQ      0x384000
 141
 142 /* CP2101_BITS */
 143 #define BITS_DATA_MASK          0X0f00
 144 #define BITS_DATA_5             0X0500
 145 #define BITS_DATA_6             0X0600
 146 #define BITS_DATA_7             0X0700
 147 #define BITS_DATA_8             0X0800
 148 #define BITS_DATA_9             0X0900
 149
 150 #define BITS_PARITY_MASK        0x00f0
 151 #define BITS_PARITY_NONE        0x0000
 152 #define BITS_PARITY_ODD         0x0010
 153 #define BITS_PARITY_EVEN        0x0020
 154 #define BITS_PARITY_MARK        0x0030
 155 #define BITS_PARITY_SPACE       0x0040
 156
 157 #define BITS_STOP_MASK          0x000f
 158 #define BITS_STOP_1             0x0000
 159 #define BITS_STOP_1_5           0x0001
 160 #define BITS_STOP_2             0x0002
 161
 162 /* CP2101_BREAK */
 163 #define BREAK_ON                0x0000
 164 #define BREAK_OFF               0x0001
 165
 166 /* CP2101_CONTROL */
 167 #define CONTROL_DTR             0x0001
 168 #define CONTROL_RTS             0x0002
 169 #define CONTROL_CTS             0x0010
 170 #define CONTROL_DSR             0x0020
 171 #define CONTROL_RING            0x0040
 172 #define CONTROL_DCD             0x0080
 173 #define CONTROL_WRITE_DTR       0x0100
 174 #define CONTROL_WRITE_RTS       0x0200
 175
 176 /*
 177  * cp2101_get_config
 178  * Reads from the CP2101 configuration registers
 179  * 'size' is specified in bytes.
 180  * 'data' is a pointer to a pre-allocated array of integers large
 181  * enough to hold 'size' bytes (with 4 bytes to each integer)
 182  */
 183 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 184                 unsigned int *data, int size)
 185 {
 186         struct usb_serial *serial = port->serial;
 187         __le32 *buf;
 188         int result, i, length;
 189
 190         /* Number of integers required to contain the array */
 191         length = (((size - 1) | 3) + 1)/4;
 192
 193         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 194         if (!buf) {
 195                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 196                 return -ENOMEM;
 197         }
 198
 199         /* For get requests, the request number must be incremented */
 200         request++;
 201
 202         /* Issue the request, attempting to read 'size' bytes */
 203         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 204                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 205                                 0, buf, size, 300);
 206
 207         /* Convert data into an array of integers */
 208         for (i=0; i<length; i++)
 209                 data[i] = le32_to_cpu(buf[i]);
 210
 211         kfree(buf);
 212
 213         if (result != size) {
 214                 dev_err(&port->dev, "%s - Unable to send config request, "
 215                                 "request=0x%x size=%d result=%d\n",
 216                                 __FUNCTION__, request, size, result);
 217                 return -EPROTO;
 218         }
 219
 220         return 0;
 221 }
 222
 223 /*
 224  * cp2101_set_config
 225  * Writes to the CP2101 configuration registers
 226  * Values less than 16 bits wide are sent directly
 227  * 'size' is specified in bytes.
 228  */
 229 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 230                 unsigned int *data, int size)
 231 {
 232         struct usb_serial *serial = port->serial;
 233         __le32 *buf;
 234         int result, i, length;
 235
 236         /* Number of integers required to contain the array */
 237         length = (((size - 1) | 3) + 1)/4;
 238
 239         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 240         if (!buf) {
 241                 dev_err(&port->dev, "%s - out of memory.\n",
 242                                 __FUNCTION__);
 243                 return -ENOMEM;
 244         }
 245
 246         /* Array of integers into bytes */
 247         for (i = 0; i < length; i++)
 248                 buf[i] = cpu_to_le32(data[i]);
 249
 250         if (size > 2) {
 251                 result = usb_control_msg (serial->dev,
 252                                 usb_sndctrlpipe(serial->dev, 0),
 253                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 254                                 0, buf, size, 300);
 255         } else {
 256                 result = usb_control_msg (serial->dev,
 257                                 usb_sndctrlpipe(serial->dev, 0),
 258                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 259                                 0, NULL, 0, 300);
 260         }
 261
 262         kfree(buf);
 263
 264         if ((size > 2 && result != size) || result < 0) {
 265                 dev_err(&port->dev, "%s - Unable to send request, "
 266                                 "request=0x%x size=%d result=%d\n",
 267                                 __FUNCTION__, request, size, result);
 268                 return -EPROTO;
 269         }
 270
 271         /* Single data value */
 272         result = usb_control_msg (serial->dev,
 273                         usb_sndctrlpipe(serial->dev, 0),
 274                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 275                         0, NULL, 0, 300);
 276         return 0;
 277 }
 278
 279 /*
 280  * cp2101_set_config_single
 281  * Convenience function for calling cp2101_set_config on single data values
 282  * without requiring an integer pointer
 283  */
 284 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 285                 u8 request, unsigned int data)
 286 {
 287         return cp2101_set_config(port, request, &data, 2);
 288 }
 289
 290 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 291 {
 292         struct usb_serial *serial = port->serial;
 293         int result;
 294
 295         dbg("%s - port %d", __FUNCTION__, port->number);
 296
 297         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 298                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 299                                 __FUNCTION__);
 300                 return -EPROTO;
 301         }
 302
 303         /* Start reading from the device */
 304         usb_fill_bulk_urb (port->read_urb, serial->dev,
 305                         usb_rcvbulkpipe(serial->dev,
 306                         port->bulk_in_endpointAddress),
 307                         port->read_urb->transfer_buffer,
 308                         port->read_urb->transfer_buffer_length,
 309                         serial->type->read_bulk_callback,
 310                         port);
 311         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 312         if (result) {
 313                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 314                                 "error %d\n", __FUNCTION__, result);
 315                 return result;
 316         }
 317
 318         /* Configure the termios structure */
 319         cp2101_get_termios(port);
 320
 321         /* Set the DTR and RTS pins low */
 322         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 323
 324         return 0;
 325 }
 326
 327 static void cp2101_cleanup (struct usb_serial_port *port)
 328 {
 329         struct usb_serial *serial = port->serial;
 330
 331         dbg("%s - port %d", __FUNCTION__, port->number);
 332
 333         if (serial->dev) {
 334                 /* shutdown any bulk reads that might be going on */
 335                 if (serial->num_bulk_out)
 336                         usb_kill_urb(port->write_urb);
 337                 if (serial->num_bulk_in)
 338                         usb_kill_urb(port->read_urb);
 339         }
 340 }
 341
 342 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 343 {
 344         dbg("%s - port %d", __FUNCTION__, port->number);
 345
 346         /* shutdown our urbs */
 347         dbg("%s - shutting down urbs", __FUNCTION__);
 348         usb_kill_urb(port->write_urb);
 349         usb_kill_urb(port->read_urb);
 350
 351         mutex_lock(&port->serial->disc_mutex);
 352         if (!port->serial->disconnected)
 353                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 354         mutex_unlock(&port->serial->disc_mutex);
 355 }
 356
 357 /*
 358  * cp2101_get_termios
 359  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 360  * from the device, corrects any unsupported values, and configures the
 361  * termios structure to reflect the state of the device
 362  */
 363 static void cp2101_get_termios (struct usb_serial_port *port)
 364 {
 365         unsigned int cflag, modem_ctl[4];
 366         int baud;
 367         int bits;
 368
 369         dbg("%s - port %d", __FUNCTION__, port->number);
 370
 371         if (!port->tty || !port->tty->termios) {
 372                 dbg("%s - no tty structures", __FUNCTION__);
 373                 return;
 374         }
 375
 376         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 377         /* Convert to baudrate */
 378         if (baud)
 379                 baud = BAUD_RATE_GEN_FREQ / baud;
 380
 381         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 382
 383         tty_encode_baud_rate(port->tty, baud, baud);
 384         cflag = port->tty->termios->c_cflag;
 385
 386         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 387         cflag &= ~CSIZE;
 388         switch(bits & BITS_DATA_MASK) {
 389                 case BITS_DATA_5:
 390                         dbg("%s - data bits = 5", __FUNCTION__);
 391                         cflag |= CS5;
 392                         break;
 393                 case BITS_DATA_6:
 394                         dbg("%s - data bits = 6", __FUNCTION__);
 395                         cflag |= CS6;
 396                         break;
 397                 case BITS_DATA_7:
 398                         dbg("%s - data bits = 7", __FUNCTION__);
 399                         cflag |= CS7;
 400                         break;
 401                 case BITS_DATA_8:
 402                         dbg("%s - data bits = 8", __FUNCTION__);
 403                         cflag |= CS8;
 404                         break;
 405                 case BITS_DATA_9:
 406                         dbg("%s - data bits = 9 (not supported, "
 407                                         "using 8 data bits)", __FUNCTION__);
 408                         cflag |= CS8;
 409                         bits &= ~BITS_DATA_MASK;
 410                         bits |= BITS_DATA_8;
 411                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 412                         break;
 413                 default:
 414                         dbg("%s - Unknown number of data bits, "
 415                                         "using 8", __FUNCTION__);
 416                         cflag |= CS8;
 417                         bits &= ~BITS_DATA_MASK;
 418                         bits |= BITS_DATA_8;
 419                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 420                         break;
 421         }
 422
 423         switch(bits & BITS_PARITY_MASK) {
 424                 case BITS_PARITY_NONE:
 425                         dbg("%s - parity = NONE", __FUNCTION__);
 426                         cflag &= ~PARENB;
 427                         break;
 428                 case BITS_PARITY_ODD:
 429                         dbg("%s - parity = ODD", __FUNCTION__);
 430                         cflag |= (PARENB|PARODD);
 431                         break;
 432                 case BITS_PARITY_EVEN:
 433                         dbg("%s - parity = EVEN", __FUNCTION__);
 434                         cflag &= ~PARODD;
 435                         cflag |= PARENB;
 436                         break;
 437                 case BITS_PARITY_MARK:
 438                         dbg("%s - parity = MARK (not supported, "
 439                                         "disabling parity)", __FUNCTION__);
 440                         cflag &= ~PARENB;
 441                         bits &= ~BITS_PARITY_MASK;
 442                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 443                         break;
 444                 case BITS_PARITY_SPACE:
 445                         dbg("%s - parity = SPACE (not supported, "
 446                                         "disabling parity)", __FUNCTION__);
 447                         cflag &= ~PARENB;
 448                         bits &= ~BITS_PARITY_MASK;
 449                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 450                         break;
 451                 default:
 452                         dbg("%s - Unknown parity mode, "
 453                                         "disabling parity", __FUNCTION__);
 454                         cflag &= ~PARENB;
 455                         bits &= ~BITS_PARITY_MASK;
 456                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 457                         break;
 458         }
 459
 460         cflag &= ~CSTOPB;
 461         switch(bits & BITS_STOP_MASK) {
 462                 case BITS_STOP_1:
 463                         dbg("%s - stop bits = 1", __FUNCTION__);
 464                         break;
 465                 case BITS_STOP_1_5:
 466                         dbg("%s - stop bits = 1.5 (not supported, "
 467                                         "using 1 stop bit)", __FUNCTION__);
 468                         bits &= ~BITS_STOP_MASK;
 469                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 470                         break;
 471                 case BITS_STOP_2:
 472                         dbg("%s - stop bits = 2", __FUNCTION__);
 473                         cflag |= CSTOPB;
 474                         break;
 475                 default:
 476                         dbg("%s - Unknown number of stop bits, "
 477                                         "using 1 stop bit", __FUNCTION__);
 478                         bits &= ~BITS_STOP_MASK;
 479                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 480                         break;
 481         }
 482
 483         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 484         if (modem_ctl[0] & 0x0008) {
 485                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 486                 cflag |= CRTSCTS;
 487         } else {
 488                 dbg("%s - flow control = NONE", __FUNCTION__);
 489                 cflag &= ~CRTSCTS;
 490         }
 491
 492         port->tty->termios->c_cflag = cflag;
 493 }
 494
 495 static void cp2101_set_termios (struct usb_serial_port *port,
 496                 struct ktermios *old_termios)
 497 {
 498         unsigned int cflag, old_cflag;
 499         int baud=0, bits;
 500         unsigned int modem_ctl[4];
 501
 502         dbg("%s - port %d", __FUNCTION__, port->number);
 503
 504         if (!port->tty || !port->tty->termios) {
 505                 dbg("%s - no tty structures", __FUNCTION__);
 506                 return;
 507         }
 508         port->tty->termios->c_cflag &= ~CMSPAR;
 509
 510         cflag = port->tty->termios->c_cflag;
 511         old_cflag = old_termios->c_cflag;
 512         baud = tty_get_baud_rate(port->tty);
 513
 514         /* If the baud rate is to be updated*/
 515         if (baud != tty_termios_baud_rate(old_termios)) {
 516                 switch (baud) {
 517                         case 0:
 518                         case 600:
 519                         case 1200:
 520                         case 1800:
 521                         case 2400:
 522                         case 4800:
 523                         case 7200:
 524                         case 9600:
 525                         case 14400:
 526                         case 19200:
 527                         case 28800:
 528                         case 38400:
 529                         case 55854:
 530                         case 57600:
 531                         case 115200:
 532                         case 127117:
 533                         case 230400:
 534                         case 460800:
 535                         case 921600:
 536                         case 3686400:
 537                                 break;
 538                         default:
 539                                 baud = 9600;
 540                                 break;
 541                 }
 542
 543                 if (baud) {
 544                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 545                                         baud);
 546                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 547                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 548                                 dev_err(&port->dev, "Baud rate requested not "
 549                                                 "supported by device\n");
 550                                 baud = tty_termios_baud_rate(old_termios);
 551                         }
 552                 }
 553         }
 554         /* Report back the resulting baud rate */
 555         tty_encode_baud_rate(port->tty, baud, baud);
 556
 557         /* If the number of data bits is to be updated */
 558         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 559                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 560                 bits &= ~BITS_DATA_MASK;
 561                 switch (cflag & CSIZE) {
 562                         case CS5:
 563                                 bits |= BITS_DATA_5;
 564                                 dbg("%s - data bits = 5", __FUNCTION__);
 565                                 break;
 566                         case CS6:
 567                                 bits |= BITS_DATA_6;
 568                                 dbg("%s - data bits = 6", __FUNCTION__);
 569                                 break;
 570                         case CS7:
 571                                 bits |= BITS_DATA_7;
 572                                 dbg("%s - data bits = 7", __FUNCTION__);
 573                                 break;
 574                         case CS8:
 575                                 bits |= BITS_DATA_8;
 576                                 dbg("%s - data bits = 8", __FUNCTION__);
 577                                 break;
 578                         /*case CS9:
 579                                 bits |= BITS_DATA_9;
 580                                 dbg("%s - data bits = 9", __FUNCTION__);
 581                                 break;*/
 582                         default:
 583                                 dev_err(&port->dev, "cp2101 driver does not "
 584                                         "support the number of bits requested,"
 585                                         " using 8 bit mode\n");
 586                                 bits |= BITS_DATA_8;
 587                                 break;
 588                 }
 589                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 590                         dev_err(&port->dev, "Number of data bits requested "
 591                                         "not supported by device\n");
 592         }
 593
 594         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 595                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 596                 bits &= ~BITS_PARITY_MASK;
 597                 if (cflag & PARENB) {
 598                         if (cflag & PARODD) {
 599                                 bits |= BITS_PARITY_ODD;
 600                                 dbg("%s - parity = ODD", __FUNCTION__);
 601                         } else {
 602                                 bits |= BITS_PARITY_EVEN;
 603                                 dbg("%s - parity = EVEN", __FUNCTION__);
 604                         }
 605                 }
 606                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 607                         dev_err(&port->dev, "Parity mode not supported "
 608                                         "by device\n");
 609         }
 610
 611         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 612                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 613                 bits &= ~BITS_STOP_MASK;
 614                 if (cflag & CSTOPB) {
 615                         bits |= BITS_STOP_2;
 616                         dbg("%s - stop bits = 2", __FUNCTION__);
 617                 } else {
 618                         bits |= BITS_STOP_1;
 619                         dbg("%s - stop bits = 1", __FUNCTION__);
 620                 }
 621                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 622                         dev_err(&port->dev, "Number of stop bits requested "
 623                                         "not supported by device\n");
 624         }
 625
 626         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 627                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 628                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 629                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 630                                 modem_ctl[2], modem_ctl[3]);
 631
 632                 if (cflag & CRTSCTS) {
 633                         modem_ctl[0] &= ~0x7B;
 634                         modem_ctl[0] |= 0x09;
 635                         modem_ctl[1] = 0x80;
 636                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 637                 } else {
 638                         modem_ctl[0] &= ~0x7B;
 639                         modem_ctl[0] |= 0x01;
 640                         modem_ctl[1] |= 0x40;
 641                         dbg("%s - flow control = NONE", __FUNCTION__);
 642                 }
 643
 644                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 645                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 646                                 modem_ctl[2], modem_ctl[3]);
 647                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 648         }
 649
 650 }
 651
 652 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 653                 unsigned int set, unsigned int clear)
 654 {
 655         int control = 0;
 656
 657         dbg("%s - port %d", __FUNCTION__, port->number);
 658
 659         if (set & TIOCM_RTS) {
 660                 control |= CONTROL_RTS;
 661                 control |= CONTROL_WRITE_RTS;
 662         }
 663         if (set & TIOCM_DTR) {
 664                 control |= CONTROL_DTR;
 665                 control |= CONTROL_WRITE_DTR;
 666         }
 667         if (clear & TIOCM_RTS) {
 668                 control &= ~CONTROL_RTS;
 669                 control |= CONTROL_WRITE_RTS;
 670         }
 671         if (clear & TIOCM_DTR) {
 672                 control &= ~CONTROL_DTR;
 673                 control |= CONTROL_WRITE_DTR;
 674         }
 675
 676         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 677
 678         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 679
 680 }
 681
 682 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 683 {
 684         int control, result;
 685
 686         dbg("%s - port %d", __FUNCTION__, port->number);
 687
 688         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 689
 690         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 691                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 692                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 693                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 694                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 695                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 696
 697         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 698
 699         return result;
 700 }
 701
 702 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 703 {
 704         int state;
 705
 706         dbg("%s - port %d", __FUNCTION__, port->number);
 707         if (break_state == 0)
 708                 state = BREAK_OFF;
 709         else
 710                 state = BREAK_ON;
 711         dbg("%s - turning break %s", __FUNCTION__,
 712                         state==BREAK_OFF ? "off" : "on");
 713         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 714 }
 715
 716 static int cp2101_startup (struct usb_serial *serial)
 717 {
 718         /* CP2101 buffers behave strangely unless device is reset */
 719         usb_reset_device(serial->dev);
 720         return 0;
 721 }
 722
 723 static void cp2101_shutdown (struct usb_serial *serial)
 724 {
 725         int i;
 726
 727         dbg("%s", __FUNCTION__);
 728
 729         /* Stop reads and writes on all ports */
 730         for (i=0; i < serial->num_ports; ++i) {
 731                 cp2101_cleanup(serial->port[i]);
 732         }
 733 }
 734
 735 static int __init cp2101_init (void)
 736 {
 737         int retval;
 738
 739         retval = usb_serial_register(&cp2101_device);
 740         if (retval)
 741                 return retval; /* Failed to register */
 742
 743         retval = usb_register(&cp2101_driver);
 744         if (retval) {
 745                 /* Failed to register */
 746                 usb_serial_deregister(&cp2101_device);
 747                 return retval;
 748         }
 749
 750         /* Success */
 751         info(DRIVER_DESC " " DRIVER_VERSION);
 752         return 0;
 753 }
 754
 755 static void __exit cp2101_exit (void)
 756 {
 757         usb_deregister (&cp2101_driver);
 758         usb_serial_deregister (&cp2101_device);
 759 }
 760
 761 module_init(cp2101_init);
 762 module_exit(cp2101_exit);
 763
 764 MODULE_DESCRIPTION(DRIVER_DESC);
 765 MODULE_VERSION(DRIVER_VERSION);
 766 MODULE_LICENSE("GPL");
 767
 768 module_param(debug, bool, S_IRUGO | S_IWUSR);
 769 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");