drivers/usb/serial/cp2101.c

   1 /*
   2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  * Outstanding Issues:
  15  *  Buffers are not flushed when the port is opened.
  16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/usb.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/usb/serial.h>
  30
  31 /*
  32  * Version Information
  33  */
  34 #define DRIVER_VERSION "v0.07"
  35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  36
  37 /*
  38  * Function Prototypes
  39  */
  40 static int cp2101_open(struct usb_serial_port*, struct file*);
  41 static void cp2101_cleanup(struct usb_serial_port*);
  42 static void cp2101_close(struct usb_serial_port*, struct file*);
  43 static void cp2101_get_termios(struct usb_serial_port*);
  44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
  45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  47                 unsigned int, unsigned int);
  48 static void cp2101_break_ctl(struct usb_serial_port*, int);
  49 static int cp2101_startup (struct usb_serial *);
  50 static void cp2101_shutdown(struct usb_serial*);
  51
  52
  53 static int debug;
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  57         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  58         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  59         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  60         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  61         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  66         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  67         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  68         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  69         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  70         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  71         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  72         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  73         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  74         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  75         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  76         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  77         { } /* Terminating Entry */
  78 };
  79
  80 MODULE_DEVICE_TABLE (usb, id_table);
  81
  82 static struct usb_driver cp2101_driver = {
  83         .name           = "cp2101",
  84         .probe          = usb_serial_probe,
  85         .disconnect     = usb_serial_disconnect,
  86         .id_table       = id_table,
  87         .no_dynamic_id  =       1,
  88 };
  89
  90 static struct usb_serial_driver cp2101_device = {
  91         .driver = {
  92                 .owner =        THIS_MODULE,
  93                 .name =         "cp2101",
  94         },
  95         .usb_driver             = &cp2101_driver,
  96         .id_table               = id_table,
  97         .num_interrupt_in       = 0,
  98         .num_bulk_in            = 0,
  99         .num_bulk_out           = 0,
 100         .num_ports              = 1,
 101         .open                   = cp2101_open,
 102         .close                  = cp2101_close,
 103         .break_ctl              = cp2101_break_ctl,
 104         .set_termios            = cp2101_set_termios,
 105         .tiocmget               = cp2101_tiocmget,
 106         .tiocmset               = cp2101_tiocmset,
 107         .attach                 = cp2101_startup,
 108         .shutdown               = cp2101_shutdown,
 109 };
 110
 111 /* Config request types */
 112 #define REQTYPE_HOST_TO_DEVICE  0x41
 113 #define REQTYPE_DEVICE_TO_HOST  0xc1
 114
 115 /* Config SET requests. To GET, add 1 to the request number */
 116 #define CP2101_UART             0x00    /* Enable / Disable */
 117 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 118 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 119 #define CP2101_BREAK            0x05    /* On / Off */
 120 #define CP2101_CONTROL          0x07    /* Flow control line states */
 121 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 122 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 123
 124 /* CP2101_UART */
 125 #define UART_ENABLE             0x0001
 126 #define UART_DISABLE            0x0000
 127
 128 /* CP2101_BAUDRATE */
 129 #define BAUD_RATE_GEN_FREQ      0x384000
 130
 131 /* CP2101_BITS */
 132 #define BITS_DATA_MASK          0X0f00
 133 #define BITS_DATA_5             0X0500
 134 #define BITS_DATA_6             0X0600
 135 #define BITS_DATA_7             0X0700
 136 #define BITS_DATA_8             0X0800
 137 #define BITS_DATA_9             0X0900
 138
 139 #define BITS_PARITY_MASK        0x00f0
 140 #define BITS_PARITY_NONE        0x0000
 141 #define BITS_PARITY_ODD         0x0010
 142 #define BITS_PARITY_EVEN        0x0020
 143 #define BITS_PARITY_MARK        0x0030
 144 #define BITS_PARITY_SPACE       0x0040
 145
 146 #define BITS_STOP_MASK          0x000f
 147 #define BITS_STOP_1             0x0000
 148 #define BITS_STOP_1_5           0x0001
 149 #define BITS_STOP_2             0x0002
 150
 151 /* CP2101_BREAK */
 152 #define BREAK_ON                0x0000
 153 #define BREAK_OFF               0x0001
 154
 155 /* CP2101_CONTROL */
 156 #define CONTROL_DTR             0x0001
 157 #define CONTROL_RTS             0x0002
 158 #define CONTROL_CTS             0x0010
 159 #define CONTROL_DSR             0x0020
 160 #define CONTROL_RING            0x0040
 161 #define CONTROL_DCD             0x0080
 162 #define CONTROL_WRITE_DTR       0x0100
 163 #define CONTROL_WRITE_RTS       0x0200
 164
 165 /*
 166  * cp2101_get_config
 167  * Reads from the CP2101 configuration registers
 168  * 'size' is specified in bytes.
 169  * 'data' is a pointer to a pre-allocated array of integers large
 170  * enough to hold 'size' bytes (with 4 bytes to each integer)
 171  */
 172 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 173                 unsigned int *data, int size)
 174 {
 175         struct usb_serial *serial = port->serial;
 176         __le32 *buf;
 177         int result, i, length;
 178
 179         /* Number of integers required to contain the array */
 180         length = (((size - 1) | 3) + 1)/4;
 181
 182         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 183         if (!buf) {
 184                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 185                 return -ENOMEM;
 186         }
 187
 188         /* For get requests, the request number must be incremented */
 189         request++;
 190
 191         /* Issue the request, attempting to read 'size' bytes */
 192         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 193                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 194                                 0, buf, size, 300);
 195
 196         /* Convert data into an array of integers */
 197         for (i=0; i<length; i++)
 198                 data[i] = le32_to_cpu(buf[i]);
 199
 200         kfree(buf);
 201
 202         if (result != size) {
 203                 dev_err(&port->dev, "%s - Unable to send config request, "
 204                                 "request=0x%x size=%d result=%d\n",
 205                                 __FUNCTION__, request, size, result);
 206                 return -EPROTO;
 207         }
 208
 209         return 0;
 210 }
 211
 212 /*
 213  * cp2101_set_config
 214  * Writes to the CP2101 configuration registers
 215  * Values less than 16 bits wide are sent directly
 216  * 'size' is specified in bytes.
 217  */
 218 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 219                 unsigned int *data, int size)
 220 {
 221         struct usb_serial *serial = port->serial;
 222         __le32 *buf;
 223         int result, i, length;
 224
 225         /* Number of integers required to contain the array */
 226         length = (((size - 1) | 3) + 1)/4;
 227
 228         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 229         if (!buf) {
 230                 dev_err(&port->dev, "%s - out of memory.\n",
 231                                 __FUNCTION__);
 232                 return -ENOMEM;
 233         }
 234
 235         /* Array of integers into bytes */
 236         for (i = 0; i < length; i++)
 237                 buf[i] = cpu_to_le32(data[i]);
 238
 239         if (size > 2) {
 240                 result = usb_control_msg (serial->dev,
 241                                 usb_sndctrlpipe(serial->dev, 0),
 242                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 243                                 0, buf, size, 300);
 244         } else {
 245                 result = usb_control_msg (serial->dev,
 246                                 usb_sndctrlpipe(serial->dev, 0),
 247                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 248                                 0, NULL, 0, 300);
 249         }
 250
 251         kfree(buf);
 252
 253         if ((size > 2 && result != size) || result < 0) {
 254                 dev_err(&port->dev, "%s - Unable to send request, "
 255                                 "request=0x%x size=%d result=%d\n",
 256                                 __FUNCTION__, request, size, result);
 257                 return -EPROTO;
 258         }
 259
 260         /* Single data value */
 261         result = usb_control_msg (serial->dev,
 262                         usb_sndctrlpipe(serial->dev, 0),
 263                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 264                         0, NULL, 0, 300);
 265         return 0;
 266 }
 267
 268 /*
 269  * cp2101_set_config_single
 270  * Convenience function for calling cp2101_set_config on single data values
 271  * without requiring an integer pointer
 272  */
 273 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 274                 u8 request, unsigned int data)
 275 {
 276         return cp2101_set_config(port, request, &data, 2);
 277 }
 278
 279 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 280 {
 281         struct usb_serial *serial = port->serial;
 282         int result;
 283
 284         dbg("%s - port %d", __FUNCTION__, port->number);
 285
 286         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 287                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 288                                 __FUNCTION__);
 289                 return -EPROTO;
 290         }
 291
 292         /* Start reading from the device */
 293         usb_fill_bulk_urb (port->read_urb, serial->dev,
 294                         usb_rcvbulkpipe(serial->dev,
 295                         port->bulk_in_endpointAddress),
 296                         port->read_urb->transfer_buffer,
 297                         port->read_urb->transfer_buffer_length,
 298                         serial->type->read_bulk_callback,
 299                         port);
 300         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 301         if (result) {
 302                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 303                                 "error %d\n", __FUNCTION__, result);
 304                 return result;
 305         }
 306
 307         /* Configure the termios structure */
 308         cp2101_get_termios(port);
 309
 310         /* Set the DTR and RTS pins low */
 311         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 312
 313         return 0;
 314 }
 315
 316 static void cp2101_cleanup (struct usb_serial_port *port)
 317 {
 318         struct usb_serial *serial = port->serial;
 319
 320         dbg("%s - port %d", __FUNCTION__, port->number);
 321
 322         if (serial->dev) {
 323                 /* shutdown any bulk reads that might be going on */
 324                 if (serial->num_bulk_out)
 325                         usb_kill_urb(port->write_urb);
 326                 if (serial->num_bulk_in)
 327                         usb_kill_urb(port->read_urb);
 328         }
 329 }
 330
 331 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 332 {
 333         dbg("%s - port %d", __FUNCTION__, port->number);
 334
 335         /* shutdown our urbs */
 336         dbg("%s - shutting down urbs", __FUNCTION__);
 337         usb_kill_urb(port->write_urb);
 338         usb_kill_urb(port->read_urb);
 339
 340         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 341 }
 342
 343 /*
 344  * cp2101_get_termios
 345  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 346  * from the device, corrects any unsupported values, and configures the
 347  * termios structure to reflect the state of the device
 348  */
 349 static void cp2101_get_termios (struct usb_serial_port *port)
 350 {
 351         unsigned int cflag, modem_ctl[4];
 352         int baud;
 353         int bits;
 354
 355         dbg("%s - port %d", __FUNCTION__, port->number);
 356
 357         if ((!port->tty) || (!port->tty->termios)) {
 358                 dbg("%s - no tty structures", __FUNCTION__);
 359                 return;
 360         }
 361         cflag = port->tty->termios->c_cflag;
 362
 363         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 364         /* Convert to baudrate */
 365         if (baud)
 366                 baud = BAUD_RATE_GEN_FREQ / baud;
 367
 368         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 369         cflag &= ~CBAUD;
 370         switch (baud) {
 371                 /*
 372                  * The baud rates which are commented out below
 373                  * appear to be supported by the device
 374                  * but are non-standard
 375                  */
 376                 case 600:       cflag |= B600;          break;
 377                 case 1200:      cflag |= B1200;         break;
 378                 case 1800:      cflag |= B1800;         break;
 379                 case 2400:      cflag |= B2400;         break;
 380                 case 4800:      cflag |= B4800;         break;
 381                 /*case 7200:    cflag |= B7200;         break;*/
 382                 case 9600:      cflag |= B9600;         break;
 383                 /*case 14400:   cflag |= B14400;        break;*/
 384                 case 19200:     cflag |= B19200;        break;
 385                 /*case 28800:   cflag |= B28800;        break;*/
 386                 case 38400:     cflag |= B38400;        break;
 387                 /*case 55854:   cflag |= B55054;        break;*/
 388                 case 57600:     cflag |= B57600;        break;
 389                 case 115200:    cflag |= B115200;       break;
 390                 /*case 127117:  cflag |= B127117;       break;*/
 391                 case 230400:    cflag |= B230400;       break;
 392                 case 460800:    cflag |= B460800;       break;
 393                 case 921600:    cflag |= B921600;       break;
 394                 /*case 3686400: cflag |= B3686400;      break;*/
 395                 default:
 396                         dbg("%s - Baud rate is not supported, "
 397                                         "using 9600 baud", __FUNCTION__);
 398                         cflag |= B9600;
 399                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 400                                         (BAUD_RATE_GEN_FREQ/9600));
 401                         break;
 402         }
 403
 404         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 405         cflag &= ~CSIZE;
 406         switch(bits & BITS_DATA_MASK) {
 407                 case BITS_DATA_5:
 408                         dbg("%s - data bits = 5", __FUNCTION__);
 409                         cflag |= CS5;
 410                         break;
 411                 case BITS_DATA_6:
 412                         dbg("%s - data bits = 6", __FUNCTION__);
 413                         cflag |= CS6;
 414                         break;
 415                 case BITS_DATA_7:
 416                         dbg("%s - data bits = 7", __FUNCTION__);
 417                         cflag |= CS7;
 418                         break;
 419                 case BITS_DATA_8:
 420                         dbg("%s - data bits = 8", __FUNCTION__);
 421                         cflag |= CS8;
 422                         break;
 423                 case BITS_DATA_9:
 424                         dbg("%s - data bits = 9 (not supported, "
 425                                         "using 8 data bits)", __FUNCTION__);
 426                         cflag |= CS8;
 427                         bits &= ~BITS_DATA_MASK;
 428                         bits |= BITS_DATA_8;
 429                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 430                         break;
 431                 default:
 432                         dbg("%s - Unknown number of data bits, "
 433                                         "using 8", __FUNCTION__);
 434                         cflag |= CS8;
 435                         bits &= ~BITS_DATA_MASK;
 436                         bits |= BITS_DATA_8;
 437                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 438                         break;
 439         }
 440
 441         switch(bits & BITS_PARITY_MASK) {
 442                 case BITS_PARITY_NONE:
 443                         dbg("%s - parity = NONE", __FUNCTION__);
 444                         cflag &= ~PARENB;
 445                         break;
 446                 case BITS_PARITY_ODD:
 447                         dbg("%s - parity = ODD", __FUNCTION__);
 448                         cflag |= (PARENB|PARODD);
 449                         break;
 450                 case BITS_PARITY_EVEN:
 451                         dbg("%s - parity = EVEN", __FUNCTION__);
 452                         cflag &= ~PARODD;
 453                         cflag |= PARENB;
 454                         break;
 455                 case BITS_PARITY_MARK:
 456                         dbg("%s - parity = MARK (not supported, "
 457                                         "disabling parity)", __FUNCTION__);
 458                         cflag &= ~PARENB;
 459                         bits &= ~BITS_PARITY_MASK;
 460                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 461                         break;
 462                 case BITS_PARITY_SPACE:
 463                         dbg("%s - parity = SPACE (not supported, "
 464                                         "disabling parity)", __FUNCTION__);
 465                         cflag &= ~PARENB;
 466                         bits &= ~BITS_PARITY_MASK;
 467                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 468                         break;
 469                 default:
 470                         dbg("%s - Unknown parity mode, "
 471                                         "disabling parity", __FUNCTION__);
 472                         cflag &= ~PARENB;
 473                         bits &= ~BITS_PARITY_MASK;
 474                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 475                         break;
 476         }
 477
 478         cflag &= ~CSTOPB;
 479         switch(bits & BITS_STOP_MASK) {
 480                 case BITS_STOP_1:
 481                         dbg("%s - stop bits = 1", __FUNCTION__);
 482                         break;
 483                 case BITS_STOP_1_5:
 484                         dbg("%s - stop bits = 1.5 (not supported, "
 485                                         "using 1 stop bit)", __FUNCTION__);
 486                         bits &= ~BITS_STOP_MASK;
 487                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 488                         break;
 489                 case BITS_STOP_2:
 490                         dbg("%s - stop bits = 2", __FUNCTION__);
 491                         cflag |= CSTOPB;
 492                         break;
 493                 default:
 494                         dbg("%s - Unknown number of stop bits, "
 495                                         "using 1 stop bit", __FUNCTION__);
 496                         bits &= ~BITS_STOP_MASK;
 497                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 498                         break;
 499         }
 500
 501         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 502         if (modem_ctl[0] & 0x0008) {
 503                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 504                 cflag |= CRTSCTS;
 505         } else {
 506                 dbg("%s - flow control = NONE", __FUNCTION__);
 507                 cflag &= ~CRTSCTS;
 508         }
 509
 510         port->tty->termios->c_cflag = cflag;
 511 }
 512
 513 static void cp2101_set_termios (struct usb_serial_port *port,
 514                 struct ktermios *old_termios)
 515 {
 516         unsigned int cflag, old_cflag=0;
 517         int baud=0, bits;
 518         unsigned int modem_ctl[4];
 519
 520         dbg("%s - port %d", __FUNCTION__, port->number);
 521
 522         if ((!port->tty) || (!port->tty->termios)) {
 523                 dbg("%s - no tty structures", __FUNCTION__);
 524                 return;
 525         }
 526         cflag = port->tty->termios->c_cflag;
 527
 528         /* Check that they really want us to change something */
 529         if (old_termios) {
 530                 if ((cflag == old_termios->c_cflag) &&
 531                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 532                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 533                         dbg("%s - nothing to change...", __FUNCTION__);
 534                         return;
 535                 }
 536
 537                 old_cflag = old_termios->c_cflag;
 538         }
 539
 540         /* If the baud rate is to be updated*/
 541         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 542                 switch (cflag & CBAUD) {
 543                         /*
 544                          * The baud rates which are commented out below
 545                          * appear to be supported by the device
 546                          * but are non-standard
 547                          */
 548                         case B0:        baud = 0;       break;
 549                         case B600:      baud = 600;     break;
 550                         case B1200:     baud = 1200;    break;
 551                         case B1800:     baud = 1800;    break;
 552                         case B2400:     baud = 2400;    break;
 553                         case B4800:     baud = 4800;    break;
 554                         /*case B7200:   baud = 7200;    break;*/
 555                         case B9600:     baud = 9600;    break;
 556                         /*ase B14400:   baud = 14400;   break;*/
 557                         case B19200:    baud = 19200;   break;
 558                         /*case B28800:  baud = 28800;   break;*/
 559                         case B38400:    baud = 38400;   break;
 560                         /*case B55854:  baud = 55054;   break;*/
 561                         case B57600:    baud = 57600;   break;
 562                         case B115200:   baud = 115200;  break;
 563                         /*case B127117: baud = 127117;  break;*/
 564                         case B230400:   baud = 230400;  break;
 565                         case B460800:   baud = 460800;  break;
 566                         case B921600:   baud = 921600;  break;
 567                         /*case B3686400:        baud = 3686400; break;*/
 568                         default:
 569                                 dev_err(&port->dev, "cp2101 driver does not "
 570                                         "support the baudrate requested\n");
 571                                 break;
 572                 }
 573
 574                 if (baud) {
 575                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 576                                         baud);
 577                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 578                                                 (BAUD_RATE_GEN_FREQ / baud)))
 579                                 dev_err(&port->dev, "Baud rate requested not "
 580                                                 "supported by device\n");
 581                 }
 582         }
 583
 584         /* If the number of data bits is to be updated */
 585         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 586                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 587                 bits &= ~BITS_DATA_MASK;
 588                 switch (cflag & CSIZE) {
 589                         case CS5:
 590                                 bits |= BITS_DATA_5;
 591                                 dbg("%s - data bits = 5", __FUNCTION__);
 592                                 break;
 593                         case CS6:
 594                                 bits |= BITS_DATA_6;
 595                                 dbg("%s - data bits = 6", __FUNCTION__);
 596                                 break;
 597                         case CS7:
 598                                 bits |= BITS_DATA_7;
 599                                 dbg("%s - data bits = 7", __FUNCTION__);
 600                                 break;
 601                         case CS8:
 602                                 bits |= BITS_DATA_8;
 603                                 dbg("%s - data bits = 8", __FUNCTION__);
 604                                 break;
 605                         /*case CS9:
 606                                 bits |= BITS_DATA_9;
 607                                 dbg("%s - data bits = 9", __FUNCTION__);
 608                                 break;*/
 609                         default:
 610                                 dev_err(&port->dev, "cp2101 driver does not "
 611                                         "support the number of bits requested,"
 612                                         " using 8 bit mode\n");
 613                                 bits |= BITS_DATA_8;
 614                                 break;
 615                 }
 616                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 617                         dev_err(&port->dev, "Number of data bits requested "
 618                                         "not supported by device\n");
 619         }
 620
 621         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 622                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 623                 bits &= ~BITS_PARITY_MASK;
 624                 if (cflag & PARENB) {
 625                         if (cflag & PARODD) {
 626                                 bits |= BITS_PARITY_ODD;
 627                                 dbg("%s - parity = ODD", __FUNCTION__);
 628                         } else {
 629                                 bits |= BITS_PARITY_EVEN;
 630                                 dbg("%s - parity = EVEN", __FUNCTION__);
 631                         }
 632                 }
 633                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 634                         dev_err(&port->dev, "Parity mode not supported "
 635                                         "by device\n");
 636         }
 637
 638         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 639                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 640                 bits &= ~BITS_STOP_MASK;
 641                 if (cflag & CSTOPB) {
 642                         bits |= BITS_STOP_2;
 643                         dbg("%s - stop bits = 2", __FUNCTION__);
 644                 } else {
 645                         bits |= BITS_STOP_1;
 646                         dbg("%s - stop bits = 1", __FUNCTION__);
 647                 }
 648                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 649                         dev_err(&port->dev, "Number of stop bits requested "
 650                                         "not supported by device\n");
 651         }
 652
 653         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 654                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 655                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 656                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 657                                 modem_ctl[2], modem_ctl[3]);
 658
 659                 if (cflag & CRTSCTS) {
 660                         modem_ctl[0] &= ~0x7B;
 661                         modem_ctl[0] |= 0x09;
 662                         modem_ctl[1] = 0x80;
 663                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 664                 } else {
 665                         modem_ctl[0] &= ~0x7B;
 666                         modem_ctl[0] |= 0x01;
 667                         modem_ctl[1] |= 0x40;
 668                         dbg("%s - flow control = NONE", __FUNCTION__);
 669                 }
 670
 671                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 672                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 673                                 modem_ctl[2], modem_ctl[3]);
 674                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 675         }
 676
 677 }
 678
 679 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 680                 unsigned int set, unsigned int clear)
 681 {
 682         int control = 0;
 683
 684         dbg("%s - port %d", __FUNCTION__, port->number);
 685
 686         if (set & TIOCM_RTS) {
 687                 control |= CONTROL_RTS;
 688                 control |= CONTROL_WRITE_RTS;
 689         }
 690         if (set & TIOCM_DTR) {
 691                 control |= CONTROL_DTR;
 692                 control |= CONTROL_WRITE_DTR;
 693         }
 694         if (clear & TIOCM_RTS) {
 695                 control &= ~CONTROL_RTS;
 696                 control |= CONTROL_WRITE_RTS;
 697         }
 698         if (clear & TIOCM_DTR) {
 699                 control &= ~CONTROL_DTR;
 700                 control |= CONTROL_WRITE_DTR;
 701         }
 702
 703         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 704
 705         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 706
 707 }
 708
 709 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 710 {
 711         int control, result;
 712
 713         dbg("%s - port %d", __FUNCTION__, port->number);
 714
 715         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 716
 717         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 718                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 719                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 720                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 721                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 722                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 723
 724         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 725
 726         return result;
 727 }
 728
 729 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 730 {
 731         int state;
 732
 733         dbg("%s - port %d", __FUNCTION__, port->number);
 734         if (break_state == 0)
 735                 state = BREAK_OFF;
 736         else
 737                 state = BREAK_ON;
 738         dbg("%s - turning break %s", __FUNCTION__,
 739                         state==BREAK_OFF ? "off" : "on");
 740         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 741 }
 742
 743 static int cp2101_startup (struct usb_serial *serial)
 744 {
 745         /* CP2101 buffers behave strangely unless device is reset */
 746         usb_reset_device(serial->dev);
 747         return 0;
 748 }
 749
 750 static void cp2101_shutdown (struct usb_serial *serial)
 751 {
 752         int i;
 753
 754         dbg("%s", __FUNCTION__);
 755
 756         /* Stop reads and writes on all ports */
 757         for (i=0; i < serial->num_ports; ++i) {
 758                 cp2101_cleanup(serial->port[i]);
 759         }
 760 }
 761
 762 static int __init cp2101_init (void)
 763 {
 764         int retval;
 765
 766         retval = usb_serial_register(&cp2101_device);
 767         if (retval)
 768                 return retval; /* Failed to register */
 769
 770         retval = usb_register(&cp2101_driver);
 771         if (retval) {
 772                 /* Failed to register */
 773                 usb_serial_deregister(&cp2101_device);
 774                 return retval;
 775         }
 776
 777         /* Success */
 778         info(DRIVER_DESC " " DRIVER_VERSION);
 779         return 0;
 780 }
 781
 782 static void __exit cp2101_exit (void)
 783 {
 784         usb_deregister (&cp2101_driver);
 785         usb_serial_deregister (&cp2101_device);
 786 }
 787
 788 module_init(cp2101_init);
 789 module_exit(cp2101_exit);
 790
 791 MODULE_DESCRIPTION(DRIVER_DESC);
 792 MODULE_VERSION(DRIVER_VERSION);
 793 MODULE_LICENSE("GPL");
 794
 795 module_param(debug, bool, S_IRUGO | S_IWUSR);
 796 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");