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, 0x8293) }, /* Telegesys ETRX2USB */
  79         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  80         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  81         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  82         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  83         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  84         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
  85         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  86         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  87         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
  88         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  89         { } /* Terminating Entry */
  90 };
  91
  92 MODULE_DEVICE_TABLE (usb, id_table);
  93
  94 static struct usb_driver cp2101_driver = {
  95         .name           = "cp2101",
  96         .probe          = usb_serial_probe,
  97         .disconnect     = usb_serial_disconnect,
  98         .id_table       = id_table,
  99         .no_dynamic_id  =       1,
 100 };
 101
 102 static struct usb_serial_driver cp2101_device = {
 103         .driver = {
 104                 .owner =        THIS_MODULE,
 105                 .name =         "cp2101",
 106         },
 107         .usb_driver             = &cp2101_driver,
 108         .id_table               = id_table,
 109         .num_interrupt_in       = 0,
 110         .num_bulk_in            = NUM_DONT_CARE,
 111         .num_bulk_out           = NUM_DONT_CARE,
 112         .num_ports              = 1,
 113         .open                   = cp2101_open,
 114         .close                  = cp2101_close,
 115         .break_ctl              = cp2101_break_ctl,
 116         .set_termios            = cp2101_set_termios,
 117         .tiocmget               = cp2101_tiocmget,
 118         .tiocmset               = cp2101_tiocmset,
 119         .attach                 = cp2101_startup,
 120         .shutdown               = cp2101_shutdown,
 121 };
 122
 123 /* Config request types */
 124 #define REQTYPE_HOST_TO_DEVICE  0x41
 125 #define REQTYPE_DEVICE_TO_HOST  0xc1
 126
 127 /* Config SET requests. To GET, add 1 to the request number */
 128 #define CP2101_UART             0x00    /* Enable / Disable */
 129 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 130 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 131 #define CP2101_BREAK            0x05    /* On / Off */
 132 #define CP2101_CONTROL          0x07    /* Flow control line states */
 133 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 134 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 135
 136 /* CP2101_UART */
 137 #define UART_ENABLE             0x0001
 138 #define UART_DISABLE            0x0000
 139
 140 /* CP2101_BAUDRATE */
 141 #define BAUD_RATE_GEN_FREQ      0x384000
 142
 143 /* CP2101_BITS */
 144 #define BITS_DATA_MASK          0X0f00
 145 #define BITS_DATA_5             0X0500
 146 #define BITS_DATA_6             0X0600
 147 #define BITS_DATA_7             0X0700
 148 #define BITS_DATA_8             0X0800
 149 #define BITS_DATA_9             0X0900
 150
 151 #define BITS_PARITY_MASK        0x00f0
 152 #define BITS_PARITY_NONE        0x0000
 153 #define BITS_PARITY_ODD         0x0010
 154 #define BITS_PARITY_EVEN        0x0020
 155 #define BITS_PARITY_MARK        0x0030
 156 #define BITS_PARITY_SPACE       0x0040
 157
 158 #define BITS_STOP_MASK          0x000f
 159 #define BITS_STOP_1             0x0000
 160 #define BITS_STOP_1_5           0x0001
 161 #define BITS_STOP_2             0x0002
 162
 163 /* CP2101_BREAK */
 164 #define BREAK_ON                0x0000
 165 #define BREAK_OFF               0x0001
 166
 167 /* CP2101_CONTROL */
 168 #define CONTROL_DTR             0x0001
 169 #define CONTROL_RTS             0x0002
 170 #define CONTROL_CTS             0x0010
 171 #define CONTROL_DSR             0x0020
 172 #define CONTROL_RING            0x0040
 173 #define CONTROL_DCD             0x0080
 174 #define CONTROL_WRITE_DTR       0x0100
 175 #define CONTROL_WRITE_RTS       0x0200
 176
 177 /*
 178  * cp2101_get_config
 179  * Reads from the CP2101 configuration registers
 180  * 'size' is specified in bytes.
 181  * 'data' is a pointer to a pre-allocated array of integers large
 182  * enough to hold 'size' bytes (with 4 bytes to each integer)
 183  */
 184 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 185                 unsigned int *data, int size)
 186 {
 187         struct usb_serial *serial = port->serial;
 188         __le32 *buf;
 189         int result, i, length;
 190
 191         /* Number of integers required to contain the array */
 192         length = (((size - 1) | 3) + 1)/4;
 193
 194         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 195         if (!buf) {
 196                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 197                 return -ENOMEM;
 198         }
 199
 200         /* For get requests, the request number must be incremented */
 201         request++;
 202
 203         /* Issue the request, attempting to read 'size' bytes */
 204         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 205                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 206                                 0, buf, size, 300);
 207
 208         /* Convert data into an array of integers */
 209         for (i=0; i<length; i++)
 210                 data[i] = le32_to_cpu(buf[i]);
 211
 212         kfree(buf);
 213
 214         if (result != size) {
 215                 dev_err(&port->dev, "%s - Unable to send config request, "
 216                                 "request=0x%x size=%d result=%d\n",
 217                                 __FUNCTION__, request, size, result);
 218                 return -EPROTO;
 219         }
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * cp2101_set_config
 226  * Writes to the CP2101 configuration registers
 227  * Values less than 16 bits wide are sent directly
 228  * 'size' is specified in bytes.
 229  */
 230 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 231                 unsigned int *data, int size)
 232 {
 233         struct usb_serial *serial = port->serial;
 234         __le32 *buf;
 235         int result, i, length;
 236
 237         /* Number of integers required to contain the array */
 238         length = (((size - 1) | 3) + 1)/4;
 239
 240         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 241         if (!buf) {
 242                 dev_err(&port->dev, "%s - out of memory.\n",
 243                                 __FUNCTION__);
 244                 return -ENOMEM;
 245         }
 246
 247         /* Array of integers into bytes */
 248         for (i = 0; i < length; i++)
 249                 buf[i] = cpu_to_le32(data[i]);
 250
 251         if (size > 2) {
 252                 result = usb_control_msg (serial->dev,
 253                                 usb_sndctrlpipe(serial->dev, 0),
 254                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 255                                 0, buf, size, 300);
 256         } else {
 257                 result = usb_control_msg (serial->dev,
 258                                 usb_sndctrlpipe(serial->dev, 0),
 259                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 260                                 0, NULL, 0, 300);
 261         }
 262
 263         kfree(buf);
 264
 265         if ((size > 2 && result != size) || result < 0) {
 266                 dev_err(&port->dev, "%s - Unable to send request, "
 267                                 "request=0x%x size=%d result=%d\n",
 268                                 __FUNCTION__, request, size, result);
 269                 return -EPROTO;
 270         }
 271
 272         /* Single data value */
 273         result = usb_control_msg (serial->dev,
 274                         usb_sndctrlpipe(serial->dev, 0),
 275                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 276                         0, NULL, 0, 300);
 277         return 0;
 278 }
 279
 280 /*
 281  * cp2101_set_config_single
 282  * Convenience function for calling cp2101_set_config on single data values
 283  * without requiring an integer pointer
 284  */
 285 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 286                 u8 request, unsigned int data)
 287 {
 288         return cp2101_set_config(port, request, &data, 2);
 289 }
 290
 291 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 292 {
 293         struct usb_serial *serial = port->serial;
 294         int result;
 295
 296         dbg("%s - port %d", __FUNCTION__, port->number);
 297
 298         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 299                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 300                                 __FUNCTION__);
 301                 return -EPROTO;
 302         }
 303
 304         /* Start reading from the device */
 305         usb_fill_bulk_urb (port->read_urb, serial->dev,
 306                         usb_rcvbulkpipe(serial->dev,
 307                         port->bulk_in_endpointAddress),
 308                         port->read_urb->transfer_buffer,
 309                         port->read_urb->transfer_buffer_length,
 310                         serial->type->read_bulk_callback,
 311                         port);
 312         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 313         if (result) {
 314                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 315                                 "error %d\n", __FUNCTION__, result);
 316                 return result;
 317         }
 318
 319         /* Configure the termios structure */
 320         cp2101_get_termios(port);
 321
 322         /* Set the DTR and RTS pins low */
 323         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 324
 325         return 0;
 326 }
 327
 328 static void cp2101_cleanup (struct usb_serial_port *port)
 329 {
 330         struct usb_serial *serial = port->serial;
 331
 332         dbg("%s - port %d", __FUNCTION__, port->number);
 333
 334         if (serial->dev) {
 335                 /* shutdown any bulk reads that might be going on */
 336                 if (serial->num_bulk_out)
 337                         usb_kill_urb(port->write_urb);
 338                 if (serial->num_bulk_in)
 339                         usb_kill_urb(port->read_urb);
 340         }
 341 }
 342
 343 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 344 {
 345         dbg("%s - port %d", __FUNCTION__, port->number);
 346
 347         /* shutdown our urbs */
 348         dbg("%s - shutting down urbs", __FUNCTION__);
 349         usb_kill_urb(port->write_urb);
 350         usb_kill_urb(port->read_urb);
 351
 352         mutex_lock(&port->serial->disc_mutex);
 353         if (!port->serial->disconnected)
 354                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 355         mutex_unlock(&port->serial->disc_mutex);
 356 }
 357
 358 /*
 359  * cp2101_get_termios
 360  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 361  * from the device, corrects any unsupported values, and configures the
 362  * termios structure to reflect the state of the device
 363  */
 364 static void cp2101_get_termios (struct usb_serial_port *port)
 365 {
 366         unsigned int cflag, modem_ctl[4];
 367         int baud;
 368         int bits;
 369
 370         dbg("%s - port %d", __FUNCTION__, port->number);
 371
 372         if (!port->tty || !port->tty->termios) {
 373                 dbg("%s - no tty structures", __FUNCTION__);
 374                 return;
 375         }
 376
 377         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 378         /* Convert to baudrate */
 379         if (baud)
 380                 baud = BAUD_RATE_GEN_FREQ / baud;
 381
 382         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 383
 384         tty_encode_baud_rate(port->tty, baud, baud);
 385         cflag = port->tty->termios->c_cflag;
 386
 387         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 388         cflag &= ~CSIZE;
 389         switch(bits & BITS_DATA_MASK) {
 390                 case BITS_DATA_5:
 391                         dbg("%s - data bits = 5", __FUNCTION__);
 392                         cflag |= CS5;
 393                         break;
 394                 case BITS_DATA_6:
 395                         dbg("%s - data bits = 6", __FUNCTION__);
 396                         cflag |= CS6;
 397                         break;
 398                 case BITS_DATA_7:
 399                         dbg("%s - data bits = 7", __FUNCTION__);
 400                         cflag |= CS7;
 401                         break;
 402                 case BITS_DATA_8:
 403                         dbg("%s - data bits = 8", __FUNCTION__);
 404                         cflag |= CS8;
 405                         break;
 406                 case BITS_DATA_9:
 407                         dbg("%s - data bits = 9 (not supported, "
 408                                         "using 8 data bits)", __FUNCTION__);
 409                         cflag |= CS8;
 410                         bits &= ~BITS_DATA_MASK;
 411                         bits |= BITS_DATA_8;
 412                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 413                         break;
 414                 default:
 415                         dbg("%s - Unknown number of data bits, "
 416                                         "using 8", __FUNCTION__);
 417                         cflag |= CS8;
 418                         bits &= ~BITS_DATA_MASK;
 419                         bits |= BITS_DATA_8;
 420                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 421                         break;
 422         }
 423
 424         switch(bits & BITS_PARITY_MASK) {
 425                 case BITS_PARITY_NONE:
 426                         dbg("%s - parity = NONE", __FUNCTION__);
 427                         cflag &= ~PARENB;
 428                         break;
 429                 case BITS_PARITY_ODD:
 430                         dbg("%s - parity = ODD", __FUNCTION__);
 431                         cflag |= (PARENB|PARODD);
 432                         break;
 433                 case BITS_PARITY_EVEN:
 434                         dbg("%s - parity = EVEN", __FUNCTION__);
 435                         cflag &= ~PARODD;
 436                         cflag |= PARENB;
 437                         break;
 438                 case BITS_PARITY_MARK:
 439                         dbg("%s - parity = MARK (not supported, "
 440                                         "disabling parity)", __FUNCTION__);
 441                         cflag &= ~PARENB;
 442                         bits &= ~BITS_PARITY_MASK;
 443                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 444                         break;
 445                 case BITS_PARITY_SPACE:
 446                         dbg("%s - parity = SPACE (not supported, "
 447                                         "disabling parity)", __FUNCTION__);
 448                         cflag &= ~PARENB;
 449                         bits &= ~BITS_PARITY_MASK;
 450                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 451                         break;
 452                 default:
 453                         dbg("%s - Unknown parity mode, "
 454                                         "disabling parity", __FUNCTION__);
 455                         cflag &= ~PARENB;
 456                         bits &= ~BITS_PARITY_MASK;
 457                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 458                         break;
 459         }
 460
 461         cflag &= ~CSTOPB;
 462         switch(bits & BITS_STOP_MASK) {
 463                 case BITS_STOP_1:
 464                         dbg("%s - stop bits = 1", __FUNCTION__);
 465                         break;
 466                 case BITS_STOP_1_5:
 467                         dbg("%s - stop bits = 1.5 (not supported, "
 468                                         "using 1 stop bit)", __FUNCTION__);
 469                         bits &= ~BITS_STOP_MASK;
 470                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 471                         break;
 472                 case BITS_STOP_2:
 473                         dbg("%s - stop bits = 2", __FUNCTION__);
 474                         cflag |= CSTOPB;
 475                         break;
 476                 default:
 477                         dbg("%s - Unknown number of stop bits, "
 478                                         "using 1 stop bit", __FUNCTION__);
 479                         bits &= ~BITS_STOP_MASK;
 480                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 481                         break;
 482         }
 483
 484         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 485         if (modem_ctl[0] & 0x0008) {
 486                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 487                 cflag |= CRTSCTS;
 488         } else {
 489                 dbg("%s - flow control = NONE", __FUNCTION__);
 490                 cflag &= ~CRTSCTS;
 491         }
 492
 493         port->tty->termios->c_cflag = cflag;
 494 }
 495
 496 static void cp2101_set_termios (struct usb_serial_port *port,
 497                 struct ktermios *old_termios)
 498 {
 499         unsigned int cflag, old_cflag;
 500         int baud=0, bits;
 501         unsigned int modem_ctl[4];
 502
 503         dbg("%s - port %d", __FUNCTION__, port->number);
 504
 505         if (!port->tty || !port->tty->termios) {
 506                 dbg("%s - no tty structures", __FUNCTION__);
 507                 return;
 508         }
 509         port->tty->termios->c_cflag &= ~CMSPAR;
 510
 511         cflag = port->tty->termios->c_cflag;
 512         old_cflag = old_termios->c_cflag;
 513         baud = tty_get_baud_rate(port->tty);
 514
 515         /* If the baud rate is to be updated*/
 516         if (baud != tty_termios_baud_rate(old_termios)) {
 517                 switch (baud) {
 518                         case 0:
 519                         case 600:
 520                         case 1200:
 521                         case 1800:
 522                         case 2400:
 523                         case 4800:
 524                         case 7200:
 525                         case 9600:
 526                         case 14400:
 527                         case 19200:
 528                         case 28800:
 529                         case 38400:
 530                         case 55854:
 531                         case 57600:
 532                         case 115200:
 533                         case 127117:
 534                         case 230400:
 535                         case 460800:
 536                         case 921600:
 537                         case 3686400:
 538                                 break;
 539                         default:
 540                                 baud = 9600;
 541                                 break;
 542                 }
 543
 544                 if (baud) {
 545                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 546                                         baud);
 547                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 548                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 549                                 dev_err(&port->dev, "Baud rate requested not "
 550                                                 "supported by device\n");
 551                                 baud = tty_termios_baud_rate(old_termios);
 552                         }
 553                 }
 554         }
 555         /* Report back the resulting baud rate */
 556         tty_encode_baud_rate(port->tty, baud, baud);
 557
 558         /* If the number of data bits is to be updated */
 559         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 560                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 561                 bits &= ~BITS_DATA_MASK;
 562                 switch (cflag & CSIZE) {
 563                         case CS5:
 564                                 bits |= BITS_DATA_5;
 565                                 dbg("%s - data bits = 5", __FUNCTION__);
 566                                 break;
 567                         case CS6:
 568                                 bits |= BITS_DATA_6;
 569                                 dbg("%s - data bits = 6", __FUNCTION__);
 570                                 break;
 571                         case CS7:
 572                                 bits |= BITS_DATA_7;
 573                                 dbg("%s - data bits = 7", __FUNCTION__);
 574                                 break;
 575                         case CS8:
 576                                 bits |= BITS_DATA_8;
 577                                 dbg("%s - data bits = 8", __FUNCTION__);
 578                                 break;
 579                         /*case CS9:
 580                                 bits |= BITS_DATA_9;
 581                                 dbg("%s - data bits = 9", __FUNCTION__);
 582                                 break;*/
 583                         default:
 584                                 dev_err(&port->dev, "cp2101 driver does not "
 585                                         "support the number of bits requested,"
 586                                         " using 8 bit mode\n");
 587                                 bits |= BITS_DATA_8;
 588                                 break;
 589                 }
 590                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 591                         dev_err(&port->dev, "Number of data bits requested "
 592                                         "not supported by device\n");
 593         }
 594
 595         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 596                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 597                 bits &= ~BITS_PARITY_MASK;
 598                 if (cflag & PARENB) {
 599                         if (cflag & PARODD) {
 600                                 bits |= BITS_PARITY_ODD;
 601                                 dbg("%s - parity = ODD", __FUNCTION__);
 602                         } else {
 603                                 bits |= BITS_PARITY_EVEN;
 604                                 dbg("%s - parity = EVEN", __FUNCTION__);
 605                         }
 606                 }
 607                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 608                         dev_err(&port->dev, "Parity mode not supported "
 609                                         "by device\n");
 610         }
 611
 612         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 613                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 614                 bits &= ~BITS_STOP_MASK;
 615                 if (cflag & CSTOPB) {
 616                         bits |= BITS_STOP_2;
 617                         dbg("%s - stop bits = 2", __FUNCTION__);
 618                 } else {
 619                         bits |= BITS_STOP_1;
 620                         dbg("%s - stop bits = 1", __FUNCTION__);
 621                 }
 622                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 623                         dev_err(&port->dev, "Number of stop bits requested "
 624                                         "not supported by device\n");
 625         }
 626
 627         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 628                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 629                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 630                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 631                                 modem_ctl[2], modem_ctl[3]);
 632
 633                 if (cflag & CRTSCTS) {
 634                         modem_ctl[0] &= ~0x7B;
 635                         modem_ctl[0] |= 0x09;
 636                         modem_ctl[1] = 0x80;
 637                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 638                 } else {
 639                         modem_ctl[0] &= ~0x7B;
 640                         modem_ctl[0] |= 0x01;
 641                         modem_ctl[1] |= 0x40;
 642                         dbg("%s - flow control = NONE", __FUNCTION__);
 643                 }
 644
 645                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 646                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 647                                 modem_ctl[2], modem_ctl[3]);
 648                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 649         }
 650
 651 }
 652
 653 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 654                 unsigned int set, unsigned int clear)
 655 {
 656         int control = 0;
 657
 658         dbg("%s - port %d", __FUNCTION__, port->number);
 659
 660         if (set & TIOCM_RTS) {
 661                 control |= CONTROL_RTS;
 662                 control |= CONTROL_WRITE_RTS;
 663         }
 664         if (set & TIOCM_DTR) {
 665                 control |= CONTROL_DTR;
 666                 control |= CONTROL_WRITE_DTR;
 667         }
 668         if (clear & TIOCM_RTS) {
 669                 control &= ~CONTROL_RTS;
 670                 control |= CONTROL_WRITE_RTS;
 671         }
 672         if (clear & TIOCM_DTR) {
 673                 control &= ~CONTROL_DTR;
 674                 control |= CONTROL_WRITE_DTR;
 675         }
 676
 677         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 678
 679         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 680
 681 }
 682
 683 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 684 {
 685         int control, result;
 686
 687         dbg("%s - port %d", __FUNCTION__, port->number);
 688
 689         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 690
 691         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 692                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 693                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 694                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 695                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 696                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 697
 698         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 699
 700         return result;
 701 }
 702
 703 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 704 {
 705         int state;
 706
 707         dbg("%s - port %d", __FUNCTION__, port->number);
 708         if (break_state == 0)
 709                 state = BREAK_OFF;
 710         else
 711                 state = BREAK_ON;
 712         dbg("%s - turning break %s", __FUNCTION__,
 713                         state==BREAK_OFF ? "off" : "on");
 714         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 715 }
 716
 717 static int cp2101_startup (struct usb_serial *serial)
 718 {
 719         /* CP2101 buffers behave strangely unless device is reset */
 720         usb_reset_device(serial->dev);
 721         return 0;
 722 }
 723
 724 static void cp2101_shutdown (struct usb_serial *serial)
 725 {
 726         int i;
 727
 728         dbg("%s", __FUNCTION__);
 729
 730         /* Stop reads and writes on all ports */
 731         for (i=0; i < serial->num_ports; ++i) {
 732                 cp2101_cleanup(serial->port[i]);
 733         }
 734 }
 735
 736 static int __init cp2101_init (void)
 737 {
 738         int retval;
 739
 740         retval = usb_serial_register(&cp2101_device);
 741         if (retval)
 742                 return retval; /* Failed to register */
 743
 744         retval = usb_register(&cp2101_driver);
 745         if (retval) {
 746                 /* Failed to register */
 747                 usb_serial_deregister(&cp2101_device);
 748                 return retval;
 749         }
 750
 751         /* Success */
 752         info(DRIVER_DESC " " DRIVER_VERSION);
 753         return 0;
 754 }
 755
 756 static void __exit cp2101_exit (void)
 757 {
 758         usb_deregister (&cp2101_driver);
 759         usb_serial_deregister (&cp2101_device);
 760 }
 761
 762 module_init(cp2101_init);
 763 module_exit(cp2101_exit);
 764
 765 MODULE_DESCRIPTION(DRIVER_DESC);
 766 MODULE_VERSION(DRIVER_VERSION);
 767 MODULE_LICENSE("GPL");
 768
 769 module_param(debug, bool, S_IRUGO | S_IWUSR);
 770 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");