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