drivers/usb/serial/cp2101.c

   1 /*
   2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  * Outstanding Issues:
  15  *  Buffers are not flushed when the port is opened.
  16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
  17  *
  18  */
  19
  20 #include <linux/config.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/slab.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/usb.h>
  29 #include <asm/uaccess.h>
  30 #include "usb-serial.h"
  31
  32 /*
  33  * Version Information
  34  */
  35 #define DRIVER_VERSION "v0.07"
  36 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  37
  38 /*
  39  * Function Prototypes
  40  */
  41 static int cp2101_open(struct usb_serial_port*, struct file*);
  42 static void cp2101_cleanup(struct usb_serial_port*);
  43 static void cp2101_close(struct usb_serial_port*, struct file*);
  44 static void cp2101_get_termios(struct usb_serial_port*);
  45 static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
  46 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  47 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  48                 unsigned int, unsigned int);
  49 static void cp2101_break_ctl(struct usb_serial_port*, int);
  50 static int cp2101_startup (struct usb_serial *);
  51 static void cp2101_shutdown(struct usb_serial*);
  52
  53
  54 static int debug;
  55
  56 static struct usb_device_id id_table [] = {
  57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  58         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  59         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  60         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  61         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  66         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  67         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  68         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  69         { } /* Terminating Entry */
  70 };
  71
  72 MODULE_DEVICE_TABLE (usb, id_table);
  73
  74 static struct usb_driver cp2101_driver = {
  75         .name           = "cp2101",
  76         .probe          = usb_serial_probe,
  77         .disconnect     = usb_serial_disconnect,
  78         .id_table       = id_table,
  79         .no_dynamic_id  =       1,
  80 };
  81
  82 static struct usb_serial_driver cp2101_device = {
  83         .driver = {
  84                 .owner =        THIS_MODULE,
  85                 .name =         "cp2101",
  86         },
  87         .id_table               = id_table,
  88         .num_interrupt_in       = 0,
  89         .num_bulk_in            = 0,
  90         .num_bulk_out           = 0,
  91         .num_ports              = 1,
  92         .open                   = cp2101_open,
  93         .close                  = cp2101_close,
  94         .break_ctl              = cp2101_break_ctl,
  95         .set_termios            = cp2101_set_termios,
  96         .tiocmget               = cp2101_tiocmget,
  97         .tiocmset               = cp2101_tiocmset,
  98         .attach                 = cp2101_startup,
  99         .shutdown               = cp2101_shutdown,
 100 };
 101
 102 /* Config request types */
 103 #define REQTYPE_HOST_TO_DEVICE  0x41
 104 #define REQTYPE_DEVICE_TO_HOST  0xc1
 105
 106 /* Config SET requests. To GET, add 1 to the request number */
 107 #define CP2101_UART             0x00    /* Enable / Disable */
 108 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 109 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 110 #define CP2101_BREAK            0x05    /* On / Off */
 111 #define CP2101_CONTROL          0x07    /* Flow control line states */
 112 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 113 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 114
 115 /* CP2101_UART */
 116 #define UART_ENABLE             0x0001
 117 #define UART_DISABLE            0x0000
 118
 119 /* CP2101_BAUDRATE */
 120 #define BAUD_RATE_GEN_FREQ      0x384000
 121
 122 /* CP2101_BITS */
 123 #define BITS_DATA_MASK          0X0f00
 124 #define BITS_DATA_5             0X0500
 125 #define BITS_DATA_6             0X0600
 126 #define BITS_DATA_7             0X0700
 127 #define BITS_DATA_8             0X0800
 128 #define BITS_DATA_9             0X0900
 129
 130 #define BITS_PARITY_MASK        0x00f0
 131 #define BITS_PARITY_NONE        0x0000
 132 #define BITS_PARITY_ODD         0x0010
 133 #define BITS_PARITY_EVEN        0x0020
 134 #define BITS_PARITY_MARK        0x0030
 135 #define BITS_PARITY_SPACE       0x0040
 136
 137 #define BITS_STOP_MASK          0x000f
 138 #define BITS_STOP_1             0x0000
 139 #define BITS_STOP_1_5           0x0001
 140 #define BITS_STOP_2             0x0002
 141
 142 /* CP2101_BREAK */
 143 #define BREAK_ON                0x0000
 144 #define BREAK_OFF               0x0001
 145
 146 /* CP2101_CONTROL */
 147 #define CONTROL_DTR             0x0001
 148 #define CONTROL_RTS             0x0002
 149 #define CONTROL_CTS             0x0010
 150 #define CONTROL_DSR             0x0020
 151 #define CONTROL_RING            0x0040
 152 #define CONTROL_DCD             0x0080
 153 #define CONTROL_WRITE_DTR       0x0100
 154 #define CONTROL_WRITE_RTS       0x0200
 155
 156 /*
 157  * cp2101_get_config
 158  * Reads from the CP2101 configuration registers
 159  * 'size' is specified in bytes.
 160  * 'data' is a pointer to a pre-allocated array of integers large
 161  * enough to hold 'size' bytes (with 4 bytes to each integer)
 162  */
 163 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 164                 unsigned int *data, int size)
 165 {
 166         struct usb_serial *serial = port->serial;
 167         u32 *buf;
 168         int result, i, length;
 169
 170         /* Number of integers required to contain the array */
 171         length = (((size - 1) | 3) + 1)/4;
 172
 173         buf = kcalloc(length, sizeof(u32), GFP_KERNEL);
 174         if (!buf) {
 175                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 176                 return -ENOMEM;
 177         }
 178
 179         /* For get requests, the request number must be incremented */
 180         request++;
 181
 182         /* Issue the request, attempting to read 'size' bytes */
 183         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 184                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 185                                 0, buf, size, 300);
 186
 187         /* Convert data into an array of integers */
 188         for (i=0; i<length; i++)
 189                 data[i] = le32_to_cpu(buf[i]);
 190
 191         kfree(buf);
 192
 193         if (result != size) {
 194                 dev_err(&port->dev, "%s - Unable to send config request, "
 195                                 "request=0x%x size=%d result=%d\n",
 196                                 __FUNCTION__, request, size, result);
 197                 return -EPROTO;
 198         }
 199
 200         return 0;
 201 }
 202
 203 /*
 204  * cp2101_set_config
 205  * Writes to the CP2101 configuration registers
 206  * Values less than 16 bits wide are sent directly
 207  * 'size' is specified in bytes.
 208  */
 209 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 210                 unsigned int *data, int size)
 211 {
 212         struct usb_serial *serial = port->serial;
 213         u32 *buf;
 214         int result, i, length;
 215
 216         /* Number of integers required to contain the array */
 217         length = (((size - 1) | 3) + 1)/4;
 218
 219         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 220         if (!buf) {
 221                 dev_err(&port->dev, "%s - out of memory.\n",
 222                                 __FUNCTION__);
 223                 return -ENOMEM;
 224         }
 225
 226         /* Array of integers into bytes */
 227         for (i = 0; i < length; i++)
 228                 buf[i] = cpu_to_le32(data[i]);
 229
 230         if (size > 2) {
 231                 result = usb_control_msg (serial->dev,
 232                                 usb_sndctrlpipe(serial->dev, 0),
 233                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 234                                 0, buf, size, 300);
 235         } else {
 236                 result = usb_control_msg (serial->dev,
 237                                 usb_sndctrlpipe(serial->dev, 0),
 238                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 239                                 0, NULL, 0, 300);
 240         }
 241
 242         kfree(buf);
 243
 244         if ((size > 2 && result != size) || result < 0) {
 245                 dev_err(&port->dev, "%s - Unable to send request, "
 246                                 "request=0x%x size=%d result=%d\n",
 247                                 __FUNCTION__, request, size, result);
 248                 return -EPROTO;
 249         }
 250
 251         /* Single data value */
 252         result = usb_control_msg (serial->dev,
 253                         usb_sndctrlpipe(serial->dev, 0),
 254                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 255                         0, NULL, 0, 300);
 256         return 0;
 257 }
 258
 259 /*
 260  * cp2101_set_config_single
 261  * Convenience function for calling cp2101_set_config on single data values
 262  * without requiring an integer pointer
 263  */
 264 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 265                 u8 request, unsigned int data)
 266 {
 267         return cp2101_set_config(port, request, &data, 2);
 268 }
 269
 270 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 271 {
 272         struct usb_serial *serial = port->serial;
 273         int result;
 274
 275         dbg("%s - port %d", __FUNCTION__, port->number);
 276
 277         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 278                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 279                                 __FUNCTION__);
 280                 return -EPROTO;
 281         }
 282
 283         /* Start reading from the device */
 284         usb_fill_bulk_urb (port->read_urb, serial->dev,
 285                         usb_rcvbulkpipe(serial->dev,
 286                         port->bulk_in_endpointAddress),
 287                         port->read_urb->transfer_buffer,
 288                         port->read_urb->transfer_buffer_length,
 289                         serial->type->read_bulk_callback,
 290                         port);
 291         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 292         if (result) {
 293                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 294                                 "error %d\n", __FUNCTION__, result);
 295                 return result;
 296         }
 297
 298         /* Configure the termios structure */
 299         cp2101_get_termios(port);
 300
 301         /* Set the DTR and RTS pins low */
 302         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 303
 304         return 0;
 305 }
 306
 307 static void cp2101_cleanup (struct usb_serial_port *port)
 308 {
 309         struct usb_serial *serial = port->serial;
 310
 311         dbg("%s - port %d", __FUNCTION__, port->number);
 312
 313         if (serial->dev) {
 314                 /* shutdown any bulk reads that might be going on */
 315                 if (serial->num_bulk_out)
 316                         usb_kill_urb(port->write_urb);
 317                 if (serial->num_bulk_in)
 318                         usb_kill_urb(port->read_urb);
 319         }
 320 }
 321
 322 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 323 {
 324         dbg("%s - port %d", __FUNCTION__, port->number);
 325
 326         /* shutdown our urbs */
 327         dbg("%s - shutting down urbs", __FUNCTION__);
 328         usb_kill_urb(port->write_urb);
 329         usb_kill_urb(port->read_urb);
 330
 331         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 332 }
 333
 334 /*
 335  * cp2101_get_termios
 336  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 337  * from the device, corrects any unsupported values, and configures the
 338  * termios structure to reflect the state of the device
 339  */
 340 static void cp2101_get_termios (struct usb_serial_port *port)
 341 {
 342         unsigned int cflag, modem_ctl[4];
 343         int baud;
 344         int bits;
 345
 346         dbg("%s - port %d", __FUNCTION__, port->number);
 347
 348         if ((!port->tty) || (!port->tty->termios)) {
 349                 dbg("%s - no tty structures", __FUNCTION__);
 350                 return;
 351         }
 352         cflag = port->tty->termios->c_cflag;
 353
 354         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 355         /* Convert to baudrate */
 356         if (baud)
 357                 baud = BAUD_RATE_GEN_FREQ / baud;
 358
 359         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 360         cflag &= ~CBAUD;
 361         switch (baud) {
 362                 /*
 363                  * The baud rates which are commented out below
 364                  * appear to be supported by the device
 365                  * but are non-standard
 366                  */
 367                 case 600:       cflag |= B600;          break;
 368                 case 1200:      cflag |= B1200;         break;
 369                 case 1800:      cflag |= B1800;         break;
 370                 case 2400:      cflag |= B2400;         break;
 371                 case 4800:      cflag |= B4800;         break;
 372                 /*case 7200:    cflag |= B7200;         break;*/
 373                 case 9600:      cflag |= B9600;         break;
 374                 /*case 14400:   cflag |= B14400;        break;*/
 375                 case 19200:     cflag |= B19200;        break;
 376                 /*case 28800:   cflag |= B28800;        break;*/
 377                 case 38400:     cflag |= B38400;        break;
 378                 /*case 55854:   cflag |= B55054;        break;*/
 379                 case 57600:     cflag |= B57600;        break;
 380                 case 115200:    cflag |= B115200;       break;
 381                 /*case 127117:  cflag |= B127117;       break;*/
 382                 case 230400:    cflag |= B230400;       break;
 383                 case 460800:    cflag |= B460800;       break;
 384                 case 921600:    cflag |= B921600;       break;
 385                 /*case 3686400: cflag |= B3686400;      break;*/
 386                 default:
 387                         dbg("%s - Baud rate is not supported, "
 388                                         "using 9600 baud", __FUNCTION__);
 389                         cflag |= B9600;
 390                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 391                                         (BAUD_RATE_GEN_FREQ/9600));
 392                         break;
 393         }
 394
 395         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 396         cflag &= ~CSIZE;
 397         switch(bits & BITS_DATA_MASK) {
 398                 case BITS_DATA_5:
 399                         dbg("%s - data bits = 5", __FUNCTION__);
 400                         cflag |= CS5;
 401                         break;
 402                 case BITS_DATA_6:
 403                         dbg("%s - data bits = 6", __FUNCTION__);
 404                         cflag |= CS6;
 405                         break;
 406                 case BITS_DATA_7:
 407                         dbg("%s - data bits = 7", __FUNCTION__);
 408                         cflag |= CS7;
 409                         break;
 410                 case BITS_DATA_8:
 411                         dbg("%s - data bits = 8", __FUNCTION__);
 412                         cflag |= CS8;
 413                         break;
 414                 case BITS_DATA_9:
 415                         dbg("%s - data bits = 9 (not supported, "
 416                                         "using 8 data bits)", __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                 default:
 423                         dbg("%s - Unknown number of data bits, "
 424                                         "using 8", __FUNCTION__);
 425                         cflag |= CS8;
 426                         bits &= ~BITS_DATA_MASK;
 427                         bits |= BITS_DATA_8;
 428                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 429                         break;
 430         }
 431
 432         switch(bits & BITS_PARITY_MASK) {
 433                 case BITS_PARITY_NONE:
 434                         dbg("%s - parity = NONE", __FUNCTION__);
 435                         cflag &= ~PARENB;
 436                         break;
 437                 case BITS_PARITY_ODD:
 438                         dbg("%s - parity = ODD", __FUNCTION__);
 439                         cflag |= (PARENB|PARODD);
 440                         break;
 441                 case BITS_PARITY_EVEN:
 442                         dbg("%s - parity = EVEN", __FUNCTION__);
 443                         cflag &= ~PARODD;
 444                         cflag |= PARENB;
 445                         break;
 446                 case BITS_PARITY_MARK:
 447                         dbg("%s - parity = MARK (not supported, "
 448                                         "disabling parity)", __FUNCTION__);
 449                         cflag &= ~PARENB;
 450                         bits &= ~BITS_PARITY_MASK;
 451                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 452                         break;
 453                 case BITS_PARITY_SPACE:
 454                         dbg("%s - parity = SPACE (not supported, "
 455                                         "disabling parity)", __FUNCTION__);
 456                         cflag &= ~PARENB;
 457                         bits &= ~BITS_PARITY_MASK;
 458                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 459                         break;
 460                 default:
 461                         dbg("%s - Unknown parity mode, "
 462                                         "disabling parity", __FUNCTION__);
 463                         cflag &= ~PARENB;
 464                         bits &= ~BITS_PARITY_MASK;
 465                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 466                         break;
 467         }
 468
 469         cflag &= ~CSTOPB;
 470         switch(bits & BITS_STOP_MASK) {
 471                 case BITS_STOP_1:
 472                         dbg("%s - stop bits = 1", __FUNCTION__);
 473                         break;
 474                 case BITS_STOP_1_5:
 475                         dbg("%s - stop bits = 1.5 (not supported, "
 476                                         "using 1 stop bit)", __FUNCTION__);
 477                         bits &= ~BITS_STOP_MASK;
 478                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 479                         break;
 480                 case BITS_STOP_2:
 481                         dbg("%s - stop bits = 2", __FUNCTION__);
 482                         cflag |= CSTOPB;
 483                         break;
 484                 default:
 485                         dbg("%s - Unknown number of stop bits, "
 486                                         "using 1 stop bit", __FUNCTION__);
 487                         bits &= ~BITS_STOP_MASK;
 488                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 489                         break;
 490         }
 491
 492         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 493         if (modem_ctl[0] & 0x0008) {
 494                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 495                 cflag |= CRTSCTS;
 496         } else {
 497                 dbg("%s - flow control = NONE", __FUNCTION__);
 498                 cflag &= ~CRTSCTS;
 499         }
 500
 501         port->tty->termios->c_cflag = cflag;
 502 }
 503
 504 static void cp2101_set_termios (struct usb_serial_port *port,
 505                 struct termios *old_termios)
 506 {
 507         unsigned int cflag, old_cflag=0;
 508         int baud=0, bits;
 509         unsigned int modem_ctl[4];
 510
 511         dbg("%s - port %d", __FUNCTION__, port->number);
 512
 513         if ((!port->tty) || (!port->tty->termios)) {
 514                 dbg("%s - no tty structures", __FUNCTION__);
 515                 return;
 516         }
 517         cflag = port->tty->termios->c_cflag;
 518
 519         /* Check that they really want us to change something */
 520         if (old_termios) {
 521                 if ((cflag == old_termios->c_cflag) &&
 522                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 523                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 524                         dbg("%s - nothing to change...", __FUNCTION__);
 525                         return;
 526                 }
 527
 528                 old_cflag = old_termios->c_cflag;
 529         }
 530
 531         /* If the baud rate is to be updated*/
 532         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 533                 switch (cflag & CBAUD) {
 534                         /*
 535                          * The baud rates which are commented out below
 536                          * appear to be supported by the device
 537                          * but are non-standard
 538                          */
 539                         case B0:        baud = 0;       break;
 540                         case B600:      baud = 600;     break;
 541                         case B1200:     baud = 1200;    break;
 542                         case B1800:     baud = 1800;    break;
 543                         case B2400:     baud = 2400;    break;
 544                         case B4800:     baud = 4800;    break;
 545                         /*case B7200:   baud = 7200;    break;*/
 546                         case B9600:     baud = 9600;    break;
 547                         /*ase B14400:   baud = 14400;   break;*/
 548                         case B19200:    baud = 19200;   break;
 549                         /*case B28800:  baud = 28800;   break;*/
 550                         case B38400:    baud = 38400;   break;
 551                         /*case B55854:  baud = 55054;   break;*/
 552                         case B57600:    baud = 57600;   break;
 553                         case B115200:   baud = 115200;  break;
 554                         /*case B127117: baud = 127117;  break;*/
 555                         case B230400:   baud = 230400;  break;
 556                         case B460800:   baud = 460800;  break;
 557                         case B921600:   baud = 921600;  break;
 558                         /*case B3686400:        baud = 3686400; break;*/
 559                         default:
 560                                 dev_err(&port->dev, "cp2101 driver does not "
 561                                         "support the baudrate requested\n");
 562                                 break;
 563                 }
 564
 565                 if (baud) {
 566                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 567                                         baud);
 568                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 569                                                 (BAUD_RATE_GEN_FREQ / baud)))
 570                                 dev_err(&port->dev, "Baud rate requested not "
 571                                                 "supported by device\n");
 572                 }
 573         }
 574
 575         /* If the number of data bits is to be updated */
 576         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 577                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 578                 bits &= ~BITS_DATA_MASK;
 579                 switch (cflag & CSIZE) {
 580                         case CS5:
 581                                 bits |= BITS_DATA_5;
 582                                 dbg("%s - data bits = 5", __FUNCTION__);
 583                                 break;
 584                         case CS6:
 585                                 bits |= BITS_DATA_6;
 586                                 dbg("%s - data bits = 6", __FUNCTION__);
 587                                 break;
 588                         case CS7:
 589                                 bits |= BITS_DATA_7;
 590                                 dbg("%s - data bits = 7", __FUNCTION__);
 591                                 break;
 592                         case CS8:
 593                                 bits |= BITS_DATA_8;
 594                                 dbg("%s - data bits = 8", __FUNCTION__);
 595                                 break;
 596                         /*case CS9:
 597                                 bits |= BITS_DATA_9;
 598                                 dbg("%s - data bits = 9", __FUNCTION__);
 599                                 break;*/
 600                         default:
 601                                 dev_err(&port->dev, "cp2101 driver does not "
 602                                         "support the number of bits requested,"
 603                                         " using 8 bit mode\n");
 604                                 bits |= BITS_DATA_8;
 605                                 break;
 606                 }
 607                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 608                         dev_err(&port->dev, "Number of data bits requested "
 609                                         "not supported by device\n");
 610         }
 611
 612         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 613                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 614                 bits &= ~BITS_PARITY_MASK;
 615                 if (cflag & PARENB) {
 616                         if (cflag & PARODD) {
 617                                 bits |= BITS_PARITY_ODD;
 618                                 dbg("%s - parity = ODD", __FUNCTION__);
 619                         } else {
 620                                 bits |= BITS_PARITY_EVEN;
 621                                 dbg("%s - parity = EVEN", __FUNCTION__);
 622                         }
 623                 }
 624                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 625                         dev_err(&port->dev, "Parity mode not supported "
 626                                         "by device\n");
 627         }
 628
 629         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 630                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 631                 bits &= ~BITS_STOP_MASK;
 632                 if (cflag & CSTOPB) {
 633                         bits |= BITS_STOP_2;
 634                         dbg("%s - stop bits = 2", __FUNCTION__);
 635                 } else {
 636                         bits |= BITS_STOP_1;
 637                         dbg("%s - stop bits = 1", __FUNCTION__);
 638                 }
 639                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 640                         dev_err(&port->dev, "Number of stop bits requested "
 641                                         "not supported by device\n");
 642         }
 643
 644         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 645                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 646                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 647                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 648                                 modem_ctl[2], modem_ctl[3]);
 649
 650                 if (cflag & CRTSCTS) {
 651                         modem_ctl[0] &= ~0x7B;
 652                         modem_ctl[0] |= 0x09;
 653                         modem_ctl[1] = 0x80;
 654                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 655                 } else {
 656                         modem_ctl[0] &= ~0x7B;
 657                         modem_ctl[0] |= 0x01;
 658                         modem_ctl[1] |= 0x40;
 659                         dbg("%s - flow control = NONE", __FUNCTION__);
 660                 }
 661
 662                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 663                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 664                                 modem_ctl[2], modem_ctl[3]);
 665                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 666         }
 667
 668 }
 669
 670 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 671                 unsigned int set, unsigned int clear)
 672 {
 673         int control = 0;
 674
 675         dbg("%s - port %d", __FUNCTION__, port->number);
 676
 677         if (set & TIOCM_RTS) {
 678                 control |= CONTROL_RTS;
 679                 control |= CONTROL_WRITE_RTS;
 680         }
 681         if (set & TIOCM_DTR) {
 682                 control |= CONTROL_DTR;
 683                 control |= CONTROL_WRITE_DTR;
 684         }
 685         if (clear & TIOCM_RTS) {
 686                 control &= ~CONTROL_RTS;
 687                 control |= CONTROL_WRITE_RTS;
 688         }
 689         if (clear & TIOCM_DTR) {
 690                 control &= ~CONTROL_DTR;
 691                 control |= CONTROL_WRITE_DTR;
 692         }
 693
 694         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 695
 696         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 697
 698 }
 699
 700 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 701 {
 702         int control, result;
 703
 704         dbg("%s - port %d", __FUNCTION__, port->number);
 705
 706         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 707
 708         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 709                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 710                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 711                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 712                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 713                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 714
 715         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 716
 717         return result;
 718 }
 719
 720 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 721 {
 722         int state;
 723
 724         dbg("%s - port %d", __FUNCTION__, port->number);
 725         if (break_state == 0)
 726                 state = BREAK_OFF;
 727         else
 728                 state = BREAK_ON;
 729         dbg("%s - turning break %s", __FUNCTION__,
 730                         state==BREAK_OFF ? "off" : "on");
 731         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 732 }
 733
 734 static int cp2101_startup (struct usb_serial *serial)
 735 {
 736         /* CP2101 buffers behave strangely unless device is reset */
 737         usb_reset_device(serial->dev);
 738         return 0;
 739 }
 740
 741 static void cp2101_shutdown (struct usb_serial *serial)
 742 {
 743         int i;
 744
 745         dbg("%s", __FUNCTION__);
 746
 747         /* Stop reads and writes on all ports */
 748         for (i=0; i < serial->num_ports; ++i) {
 749                 cp2101_cleanup(serial->port[i]);
 750         }
 751 }
 752
 753 static int __init cp2101_init (void)
 754 {
 755         int retval;
 756
 757         retval = usb_serial_register(&cp2101_device);
 758         if (retval)
 759                 return retval; /* Failed to register */
 760
 761         retval = usb_register(&cp2101_driver);
 762         if (retval) {
 763                 /* Failed to register */
 764                 usb_serial_deregister(&cp2101_device);
 765                 return retval;
 766         }
 767
 768         /* Success */
 769         info(DRIVER_DESC " " DRIVER_VERSION);
 770         return 0;
 771 }
 772
 773 static void __exit cp2101_exit (void)
 774 {
 775         usb_deregister (&cp2101_driver);
 776         usb_serial_deregister (&cp2101_device);
 777 }
 778
 779 module_init(cp2101_init);
 780 module_exit(cp2101_exit);
 781
 782 MODULE_DESCRIPTION(DRIVER_DESC);
 783 MODULE_VERSION(DRIVER_VERSION);
 784 MODULE_LICENSE("GPL");
 785
 786 module_param(debug, bool, S_IRUGO | S_IWUSR);
 787 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");