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(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  57         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  58         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  59         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  60         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  63         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  64         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  65         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  66         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  67         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  68         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  69         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  70         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  71         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  72         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  73         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  74         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  75         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  76         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  77         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  78         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  79         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  80         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  81         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  82         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  83         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  84         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  85         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  86         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  87         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  88         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
  89         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  90         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  91         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
  92         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  93         { } /* Terminating Entry */
  94 };
  95
  96 MODULE_DEVICE_TABLE (usb, id_table);
  97
  98 static struct usb_driver cp2101_driver = {
  99         .name           = "cp2101",
 100         .probe          = usb_serial_probe,
 101         .disconnect     = usb_serial_disconnect,
 102         .id_table       = id_table,
 103         .no_dynamic_id  =       1,
 104 };
 105
 106 static struct usb_serial_driver cp2101_device = {
 107         .driver = {
 108                 .owner =        THIS_MODULE,
 109                 .name =         "cp2101",
 110         },
 111         .usb_driver             = &cp2101_driver,
 112         .id_table               = id_table,
 113         .num_ports              = 1,
 114         .open                   = cp2101_open,
 115         .close                  = cp2101_close,
 116         .break_ctl              = cp2101_break_ctl,
 117         .set_termios            = cp2101_set_termios,
 118         .tiocmget               = cp2101_tiocmget,
 119         .tiocmset               = cp2101_tiocmset,
 120         .attach                 = cp2101_startup,
 121         .shutdown               = cp2101_shutdown,
 122 };
 123
 124 /* Config request types */
 125 #define REQTYPE_HOST_TO_DEVICE  0x41
 126 #define REQTYPE_DEVICE_TO_HOST  0xc1
 127
 128 /* Config SET requests. To GET, add 1 to the request number */
 129 #define CP2101_UART             0x00    /* Enable / Disable */
 130 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 131 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 132 #define CP2101_BREAK            0x05    /* On / Off */
 133 #define CP2101_CONTROL          0x07    /* Flow control line states */
 134 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 135 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 136
 137 /* CP2101_UART */
 138 #define UART_ENABLE             0x0001
 139 #define UART_DISABLE            0x0000
 140
 141 /* CP2101_BAUDRATE */
 142 #define BAUD_RATE_GEN_FREQ      0x384000
 143
 144 /* CP2101_BITS */
 145 #define BITS_DATA_MASK          0X0f00
 146 #define BITS_DATA_5             0X0500
 147 #define BITS_DATA_6             0X0600
 148 #define BITS_DATA_7             0X0700
 149 #define BITS_DATA_8             0X0800
 150 #define BITS_DATA_9             0X0900
 151
 152 #define BITS_PARITY_MASK        0x00f0
 153 #define BITS_PARITY_NONE        0x0000
 154 #define BITS_PARITY_ODD         0x0010
 155 #define BITS_PARITY_EVEN        0x0020
 156 #define BITS_PARITY_MARK        0x0030
 157 #define BITS_PARITY_SPACE       0x0040
 158
 159 #define BITS_STOP_MASK          0x000f
 160 #define BITS_STOP_1             0x0000
 161 #define BITS_STOP_1_5           0x0001
 162 #define BITS_STOP_2             0x0002
 163
 164 /* CP2101_BREAK */
 165 #define BREAK_ON                0x0000
 166 #define BREAK_OFF               0x0001
 167
 168 /* CP2101_CONTROL */
 169 #define CONTROL_DTR             0x0001
 170 #define CONTROL_RTS             0x0002
 171 #define CONTROL_CTS             0x0010
 172 #define CONTROL_DSR             0x0020
 173 #define CONTROL_RING            0x0040
 174 #define CONTROL_DCD             0x0080
 175 #define CONTROL_WRITE_DTR       0x0100
 176 #define CONTROL_WRITE_RTS       0x0200
 177
 178 /*
 179  * cp2101_get_config
 180  * Reads from the CP2101 configuration registers
 181  * 'size' is specified in bytes.
 182  * 'data' is a pointer to a pre-allocated array of integers large
 183  * enough to hold 'size' bytes (with 4 bytes to each integer)
 184  */
 185 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 186                 unsigned int *data, int size)
 187 {
 188         struct usb_serial *serial = port->serial;
 189         __le32 *buf;
 190         int result, i, length;
 191
 192         /* Number of integers required to contain the array */
 193         length = (((size - 1) | 3) + 1)/4;
 194
 195         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 196         if (!buf) {
 197                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 198                 return -ENOMEM;
 199         }
 200
 201         /* For get requests, the request number must be incremented */
 202         request++;
 203
 204         /* Issue the request, attempting to read 'size' bytes */
 205         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 206                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 207                                 0, buf, size, 300);
 208
 209         /* Convert data into an array of integers */
 210         for (i=0; i<length; i++)
 211                 data[i] = le32_to_cpu(buf[i]);
 212
 213         kfree(buf);
 214
 215         if (result != size) {
 216                 dev_err(&port->dev, "%s - Unable to send config request, "
 217                                 "request=0x%x size=%d result=%d\n",
 218                                 __func__, request, size, result);
 219                 return -EPROTO;
 220         }
 221
 222         return 0;
 223 }
 224
 225 /*
 226  * cp2101_set_config
 227  * Writes to the CP2101 configuration registers
 228  * Values less than 16 bits wide are sent directly
 229  * 'size' is specified in bytes.
 230  */
 231 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 232                 unsigned int *data, int size)
 233 {
 234         struct usb_serial *serial = port->serial;
 235         __le32 *buf;
 236         int result, i, length;
 237
 238         /* Number of integers required to contain the array */
 239         length = (((size - 1) | 3) + 1)/4;
 240
 241         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 242         if (!buf) {
 243                 dev_err(&port->dev, "%s - out of memory.\n",
 244                                 __func__);
 245                 return -ENOMEM;
 246         }
 247
 248         /* Array of integers into bytes */
 249         for (i = 0; i < length; i++)
 250                 buf[i] = cpu_to_le32(data[i]);
 251
 252         if (size > 2) {
 253                 result = usb_control_msg (serial->dev,
 254                                 usb_sndctrlpipe(serial->dev, 0),
 255                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 256                                 0, buf, size, 300);
 257         } else {
 258                 result = usb_control_msg (serial->dev,
 259                                 usb_sndctrlpipe(serial->dev, 0),
 260                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 261                                 0, NULL, 0, 300);
 262         }
 263
 264         kfree(buf);
 265
 266         if ((size > 2 && result != size) || result < 0) {
 267                 dev_err(&port->dev, "%s - Unable to send request, "
 268                                 "request=0x%x size=%d result=%d\n",
 269                                 __func__, request, size, result);
 270                 return -EPROTO;
 271         }
 272
 273         /* Single data value */
 274         result = usb_control_msg (serial->dev,
 275                         usb_sndctrlpipe(serial->dev, 0),
 276                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 277                         0, NULL, 0, 300);
 278         return 0;
 279 }
 280
 281 /*
 282  * cp2101_set_config_single
 283  * Convenience function for calling cp2101_set_config on single data values
 284  * without requiring an integer pointer
 285  */
 286 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 287                 u8 request, unsigned int data)
 288 {
 289         return cp2101_set_config(port, request, &data, 2);
 290 }
 291
 292 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 293 {
 294         struct usb_serial *serial = port->serial;
 295         int result;
 296
 297         dbg("%s - port %d", __func__, port->number);
 298
 299         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 300                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 301                                 __func__);
 302                 return -EPROTO;
 303         }
 304
 305         /* Start reading from the device */
 306         usb_fill_bulk_urb (port->read_urb, serial->dev,
 307                         usb_rcvbulkpipe(serial->dev,
 308                         port->bulk_in_endpointAddress),
 309                         port->read_urb->transfer_buffer,
 310                         port->read_urb->transfer_buffer_length,
 311                         serial->type->read_bulk_callback,
 312                         port);
 313         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 314         if (result) {
 315                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 316                                 "error %d\n", __func__, result);
 317                 return result;
 318         }
 319
 320         /* Configure the termios structure */
 321         cp2101_get_termios(port);
 322
 323         /* Set the DTR and RTS pins low */
 324         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 325
 326         return 0;
 327 }
 328
 329 static void cp2101_cleanup (struct usb_serial_port *port)
 330 {
 331         struct usb_serial *serial = port->serial;
 332
 333         dbg("%s - port %d", __func__, port->number);
 334
 335         if (serial->dev) {
 336                 /* shutdown any bulk reads that might be going on */
 337                 if (serial->num_bulk_out)
 338                         usb_kill_urb(port->write_urb);
 339                 if (serial->num_bulk_in)
 340                         usb_kill_urb(port->read_urb);
 341         }
 342 }
 343
 344 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 345 {
 346         dbg("%s - port %d", __func__, port->number);
 347
 348         /* shutdown our urbs */
 349         dbg("%s - shutting down urbs", __func__);
 350         usb_kill_urb(port->write_urb);
 351         usb_kill_urb(port->read_urb);
 352
 353         mutex_lock(&port->serial->disc_mutex);
 354         if (!port->serial->disconnected)
 355                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 356         mutex_unlock(&port->serial->disc_mutex);
 357 }
 358
 359 /*
 360  * cp2101_get_termios
 361  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 362  * from the device, corrects any unsupported values, and configures the
 363  * termios structure to reflect the state of the device
 364  */
 365 static void cp2101_get_termios (struct usb_serial_port *port)
 366 {
 367         unsigned int cflag, modem_ctl[4];
 368         int baud;
 369         int bits;
 370
 371         dbg("%s - port %d", __func__, port->number);
 372
 373         if (!port->tty || !port->tty->termios) {
 374                 dbg("%s - no tty structures", __func__);
 375                 return;
 376         }
 377
 378         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 379         /* Convert to baudrate */
 380         if (baud)
 381                 baud = BAUD_RATE_GEN_FREQ / baud;
 382
 383         dbg("%s - baud rate = %d", __func__, baud);
 384
 385         tty_encode_baud_rate(port->tty, baud, baud);
 386         cflag = port->tty->termios->c_cflag;
 387
 388         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 389         cflag &= ~CSIZE;
 390         switch(bits & BITS_DATA_MASK) {
 391                 case BITS_DATA_5:
 392                         dbg("%s - data bits = 5", __func__);
 393                         cflag |= CS5;
 394                         break;
 395                 case BITS_DATA_6:
 396                         dbg("%s - data bits = 6", __func__);
 397                         cflag |= CS6;
 398                         break;
 399                 case BITS_DATA_7:
 400                         dbg("%s - data bits = 7", __func__);
 401                         cflag |= CS7;
 402                         break;
 403                 case BITS_DATA_8:
 404                         dbg("%s - data bits = 8", __func__);
 405                         cflag |= CS8;
 406                         break;
 407                 case BITS_DATA_9:
 408                         dbg("%s - data bits = 9 (not supported, "
 409                                         "using 8 data bits)", __func__);
 410                         cflag |= CS8;
 411                         bits &= ~BITS_DATA_MASK;
 412                         bits |= BITS_DATA_8;
 413                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 414                         break;
 415                 default:
 416                         dbg("%s - Unknown number of data bits, "
 417                                         "using 8", __func__);
 418                         cflag |= CS8;
 419                         bits &= ~BITS_DATA_MASK;
 420                         bits |= BITS_DATA_8;
 421                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 422                         break;
 423         }
 424
 425         switch(bits & BITS_PARITY_MASK) {
 426                 case BITS_PARITY_NONE:
 427                         dbg("%s - parity = NONE", __func__);
 428                         cflag &= ~PARENB;
 429                         break;
 430                 case BITS_PARITY_ODD:
 431                         dbg("%s - parity = ODD", __func__);
 432                         cflag |= (PARENB|PARODD);
 433                         break;
 434                 case BITS_PARITY_EVEN:
 435                         dbg("%s - parity = EVEN", __func__);
 436                         cflag &= ~PARODD;
 437                         cflag |= PARENB;
 438                         break;
 439                 case BITS_PARITY_MARK:
 440                         dbg("%s - parity = MARK (not supported, "
 441                                         "disabling parity)", __func__);
 442                         cflag &= ~PARENB;
 443                         bits &= ~BITS_PARITY_MASK;
 444                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 445                         break;
 446                 case BITS_PARITY_SPACE:
 447                         dbg("%s - parity = SPACE (not supported, "
 448                                         "disabling parity)", __func__);
 449                         cflag &= ~PARENB;
 450                         bits &= ~BITS_PARITY_MASK;
 451                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 452                         break;
 453                 default:
 454                         dbg("%s - Unknown parity mode, "
 455                                         "disabling parity", __func__);
 456                         cflag &= ~PARENB;
 457                         bits &= ~BITS_PARITY_MASK;
 458                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 459                         break;
 460         }
 461
 462         cflag &= ~CSTOPB;
 463         switch(bits & BITS_STOP_MASK) {
 464                 case BITS_STOP_1:
 465                         dbg("%s - stop bits = 1", __func__);
 466                         break;
 467                 case BITS_STOP_1_5:
 468                         dbg("%s - stop bits = 1.5 (not supported, "
 469                                         "using 1 stop bit)", __func__);
 470                         bits &= ~BITS_STOP_MASK;
 471                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 472                         break;
 473                 case BITS_STOP_2:
 474                         dbg("%s - stop bits = 2", __func__);
 475                         cflag |= CSTOPB;
 476                         break;
 477                 default:
 478                         dbg("%s - Unknown number of stop bits, "
 479                                         "using 1 stop bit", __func__);
 480                         bits &= ~BITS_STOP_MASK;
 481                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 482                         break;
 483         }
 484
 485         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 486         if (modem_ctl[0] & 0x0008) {
 487                 dbg("%s - flow control = CRTSCTS", __func__);
 488                 cflag |= CRTSCTS;
 489         } else {
 490                 dbg("%s - flow control = NONE", __func__);
 491                 cflag &= ~CRTSCTS;
 492         }
 493
 494         port->tty->termios->c_cflag = cflag;
 495 }
 496
 497 static void cp2101_set_termios (struct usb_serial_port *port,
 498                 struct ktermios *old_termios)
 499 {
 500         unsigned int cflag, old_cflag;
 501         int baud=0, bits;
 502         unsigned int modem_ctl[4];
 503
 504         dbg("%s - port %d", __func__, port->number);
 505
 506         if (!port->tty || !port->tty->termios) {
 507                 dbg("%s - no tty structures", __func__);
 508                 return;
 509         }
 510         port->tty->termios->c_cflag &= ~CMSPAR;
 511
 512         cflag = port->tty->termios->c_cflag;
 513         old_cflag = old_termios->c_cflag;
 514         baud = tty_get_baud_rate(port->tty);
 515
 516         /* If the baud rate is to be updated*/
 517         if (baud != tty_termios_baud_rate(old_termios)) {
 518                 switch (baud) {
 519                         case 0:
 520                         case 600:
 521                         case 1200:
 522                         case 1800:
 523                         case 2400:
 524                         case 4800:
 525                         case 7200:
 526                         case 9600:
 527                         case 14400:
 528                         case 19200:
 529                         case 28800:
 530                         case 38400:
 531                         case 55854:
 532                         case 57600:
 533                         case 115200:
 534                         case 127117:
 535                         case 230400:
 536                         case 460800:
 537                         case 921600:
 538                         case 3686400:
 539                                 break;
 540                         default:
 541                                 baud = 9600;
 542                                 break;
 543                 }
 544
 545                 if (baud) {
 546                         dbg("%s - Setting baud rate to %d baud", __func__,
 547                                         baud);
 548                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 549                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 550                                 dev_err(&port->dev, "Baud rate requested not "
 551                                                 "supported by device\n");
 552                                 baud = tty_termios_baud_rate(old_termios);
 553                         }
 554                 }
 555         }
 556         /* Report back the resulting baud rate */
 557         tty_encode_baud_rate(port->tty, baud, baud);
 558
 559         /* If the number of data bits is to be updated */
 560         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 561                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 562                 bits &= ~BITS_DATA_MASK;
 563                 switch (cflag & CSIZE) {
 564                         case CS5:
 565                                 bits |= BITS_DATA_5;
 566                                 dbg("%s - data bits = 5", __func__);
 567                                 break;
 568                         case CS6:
 569                                 bits |= BITS_DATA_6;
 570                                 dbg("%s - data bits = 6", __func__);
 571                                 break;
 572                         case CS7:
 573                                 bits |= BITS_DATA_7;
 574                                 dbg("%s - data bits = 7", __func__);
 575                                 break;
 576                         case CS8:
 577                                 bits |= BITS_DATA_8;
 578                                 dbg("%s - data bits = 8", __func__);
 579                                 break;
 580                         /*case CS9:
 581                                 bits |= BITS_DATA_9;
 582                                 dbg("%s - data bits = 9", __func__);
 583                                 break;*/
 584                         default:
 585                                 dev_err(&port->dev, "cp2101 driver does not "
 586                                         "support the number of bits requested,"
 587                                         " using 8 bit mode\n");
 588                                 bits |= BITS_DATA_8;
 589                                 break;
 590                 }
 591                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 592                         dev_err(&port->dev, "Number of data bits requested "
 593                                         "not supported by device\n");
 594         }
 595
 596         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 597                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 598                 bits &= ~BITS_PARITY_MASK;
 599                 if (cflag & PARENB) {
 600                         if (cflag & PARODD) {
 601                                 bits |= BITS_PARITY_ODD;
 602                                 dbg("%s - parity = ODD", __func__);
 603                         } else {
 604                                 bits |= BITS_PARITY_EVEN;
 605                                 dbg("%s - parity = EVEN", __func__);
 606                         }
 607                 }
 608                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 609                         dev_err(&port->dev, "Parity mode not supported "
 610                                         "by device\n");
 611         }
 612
 613         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 614                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 615                 bits &= ~BITS_STOP_MASK;
 616                 if (cflag & CSTOPB) {
 617                         bits |= BITS_STOP_2;
 618                         dbg("%s - stop bits = 2", __func__);
 619                 } else {
 620                         bits |= BITS_STOP_1;
 621                         dbg("%s - stop bits = 1", __func__);
 622                 }
 623                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 624                         dev_err(&port->dev, "Number of stop bits requested "
 625                                         "not supported by device\n");
 626         }
 627
 628         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 629                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 630                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 631                                 __func__, modem_ctl[0], modem_ctl[1],
 632                                 modem_ctl[2], modem_ctl[3]);
 633
 634                 if (cflag & CRTSCTS) {
 635                         modem_ctl[0] &= ~0x7B;
 636                         modem_ctl[0] |= 0x09;
 637                         modem_ctl[1] = 0x80;
 638                         dbg("%s - flow control = CRTSCTS", __func__);
 639                 } else {
 640                         modem_ctl[0] &= ~0x7B;
 641                         modem_ctl[0] |= 0x01;
 642                         modem_ctl[1] |= 0x40;
 643                         dbg("%s - flow control = NONE", __func__);
 644                 }
 645
 646                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 647                                 __func__, modem_ctl[0], modem_ctl[1],
 648                                 modem_ctl[2], modem_ctl[3]);
 649                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 650         }
 651
 652 }
 653
 654 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 655                 unsigned int set, unsigned int clear)
 656 {
 657         int control = 0;
 658
 659         dbg("%s - port %d", __func__, port->number);
 660
 661         if (set & TIOCM_RTS) {
 662                 control |= CONTROL_RTS;
 663                 control |= CONTROL_WRITE_RTS;
 664         }
 665         if (set & TIOCM_DTR) {
 666                 control |= CONTROL_DTR;
 667                 control |= CONTROL_WRITE_DTR;
 668         }
 669         if (clear & TIOCM_RTS) {
 670                 control &= ~CONTROL_RTS;
 671                 control |= CONTROL_WRITE_RTS;
 672         }
 673         if (clear & TIOCM_DTR) {
 674                 control &= ~CONTROL_DTR;
 675                 control |= CONTROL_WRITE_DTR;
 676         }
 677
 678         dbg("%s - control = 0x%.4x", __func__, control);
 679
 680         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 681
 682 }
 683
 684 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 685 {
 686         int control, result;
 687
 688         dbg("%s - port %d", __func__, port->number);
 689
 690         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 691
 692         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 693                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 694                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 695                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 696                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 697                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 698
 699         dbg("%s - control = 0x%.2x", __func__, control);
 700
 701         return result;
 702 }
 703
 704 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 705 {
 706         int state;
 707
 708         dbg("%s - port %d", __func__, port->number);
 709         if (break_state == 0)
 710                 state = BREAK_OFF;
 711         else
 712                 state = BREAK_ON;
 713         dbg("%s - turning break %s", __func__,
 714                         state==BREAK_OFF ? "off" : "on");
 715         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 716 }
 717
 718 static int cp2101_startup (struct usb_serial *serial)
 719 {
 720         /* CP2101 buffers behave strangely unless device is reset */
 721         usb_reset_device(serial->dev);
 722         return 0;
 723 }
 724
 725 static void cp2101_shutdown (struct usb_serial *serial)
 726 {
 727         int i;
 728
 729         dbg("%s", __func__);
 730
 731         /* Stop reads and writes on all ports */
 732         for (i=0; i < serial->num_ports; ++i) {
 733                 cp2101_cleanup(serial->port[i]);
 734         }
 735 }
 736
 737 static int __init cp2101_init (void)
 738 {
 739         int retval;
 740
 741         retval = usb_serial_register(&cp2101_device);
 742         if (retval)
 743                 return retval; /* Failed to register */
 744
 745         retval = usb_register(&cp2101_driver);
 746         if (retval) {
 747                 /* Failed to register */
 748                 usb_serial_deregister(&cp2101_device);
 749                 return retval;
 750         }
 751
 752         /* Success */
 753         info(DRIVER_DESC " " DRIVER_VERSION);
 754         return 0;
 755 }
 756
 757 static void __exit cp2101_exit (void)
 758 {
 759         usb_deregister (&cp2101_driver);
 760         usb_serial_deregister (&cp2101_device);
 761 }
 762
 763 module_init(cp2101_init);
 764 module_exit(cp2101_exit);
 765
 766 MODULE_DESCRIPTION(DRIVER_DESC);
 767 MODULE_VERSION(DRIVER_VERSION);
 768 MODULE_LICENSE("GPL");
 769
 770 module_param(debug, bool, S_IRUGO | S_IWUSR);
 771 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");