git.maemo.org Git - h-e-n/blob - drivers/usb/serial/cp2101.c

   1 /*
   2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  * Outstanding Issues:
  15  *  Buffers are not flushed when the port is opened.
  16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/usb.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/usb/serial.h>
  30
  31 /*
  32  * Version Information
  33  */
  34 #define DRIVER_VERSION "v0.07"
  35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  36
  37 /*
  38  * Function Prototypes
  39  */
  40 static int cp2101_open(struct usb_serial_port*, struct file*);
  41 static void cp2101_cleanup(struct usb_serial_port*);
  42 static void cp2101_close(struct usb_serial_port*, struct file*);
  43 static void cp2101_get_termios(struct usb_serial_port*);
  44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
  45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  47                 unsigned int, unsigned int);
  48 static void cp2101_break_ctl(struct usb_serial_port*, int);
  49 static int cp2101_startup (struct usb_serial *);
  50 static void cp2101_shutdown(struct usb_serial*);
  51
  52
  53 static int debug;
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  58         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  59         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  60         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  61         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  62         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  63         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  64         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  65         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  66         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  67         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  68         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  69         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  70         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  71         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  72         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  73         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  74         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  75         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  76         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  77         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  78         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  79         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  80         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  81         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  82         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  83         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
  84         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  85         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  86         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
  87         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  88         { } /* Terminating Entry */
  89 };
  90
  91 MODULE_DEVICE_TABLE (usb, id_table);
  92
  93 static struct usb_driver cp2101_driver = {
  94         .name           = "cp2101",
  95         .probe          = usb_serial_probe,
  96         .disconnect     = usb_serial_disconnect,
  97         .id_table       = id_table,
  98         .no_dynamic_id  =       1,
  99 };
 100
 101 static struct usb_serial_driver cp2101_device = {
 102         .driver = {
 103                 .owner =        THIS_MODULE,
 104                 .name =         "cp2101",
 105         },
 106         .usb_driver             = &cp2101_driver,
 107         .id_table               = id_table,
 108         .num_interrupt_in       = 0,
 109         .num_bulk_in            = NUM_DONT_CARE,
 110         .num_bulk_out           = NUM_DONT_CARE,
 111         .num_ports              = 1,
 112         .open                   = cp2101_open,
 113         .close                  = cp2101_close,
 114         .break_ctl              = cp2101_break_ctl,
 115         .set_termios            = cp2101_set_termios,
 116         .tiocmget               = cp2101_tiocmget,
 117         .tiocmset               = cp2101_tiocmset,
 118         .attach                 = cp2101_startup,
 119         .shutdown               = cp2101_shutdown,
 120 };
 121
 122 /* Config request types */
 123 #define REQTYPE_HOST_TO_DEVICE  0x41
 124 #define REQTYPE_DEVICE_TO_HOST  0xc1
 125
 126 /* Config SET requests. To GET, add 1 to the request number */
 127 #define CP2101_UART             0x00    /* Enable / Disable */
 128 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 129 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 130 #define CP2101_BREAK            0x05    /* On / Off */
 131 #define CP2101_CONTROL          0x07    /* Flow control line states */
 132 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 133 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 134
 135 /* CP2101_UART */
 136 #define UART_ENABLE             0x0001
 137 #define UART_DISABLE            0x0000
 138
 139 /* CP2101_BAUDRATE */
 140 #define BAUD_RATE_GEN_FREQ      0x384000
 141
 142 /* CP2101_BITS */
 143 #define BITS_DATA_MASK          0X0f00
 144 #define BITS_DATA_5             0X0500
 145 #define BITS_DATA_6             0X0600
 146 #define BITS_DATA_7             0X0700
 147 #define BITS_DATA_8             0X0800
 148 #define BITS_DATA_9             0X0900
 149
 150 #define BITS_PARITY_MASK        0x00f0
 151 #define BITS_PARITY_NONE        0x0000
 152 #define BITS_PARITY_ODD         0x0010
 153 #define BITS_PARITY_EVEN        0x0020
 154 #define BITS_PARITY_MARK        0x0030
 155 #define BITS_PARITY_SPACE       0x0040
 156
 157 #define BITS_STOP_MASK          0x000f
 158 #define BITS_STOP_1             0x0000
 159 #define BITS_STOP_1_5           0x0001
 160 #define BITS_STOP_2             0x0002
 161
 162 /* CP2101_BREAK */
 163 #define BREAK_ON                0x0000
 164 #define BREAK_OFF               0x0001
 165
 166 /* CP2101_CONTROL */
 167 #define CONTROL_DTR             0x0001
 168 #define CONTROL_RTS             0x0002
 169 #define CONTROL_CTS             0x0010
 170 #define CONTROL_DSR             0x0020
 171 #define CONTROL_RING            0x0040
 172 #define CONTROL_DCD             0x0080
 173 #define CONTROL_WRITE_DTR       0x0100
 174 #define CONTROL_WRITE_RTS       0x0200
 175
 176 /*
 177  * cp2101_get_config
 178  * Reads from the CP2101 configuration registers
 179  * 'size' is specified in bytes.
 180  * 'data' is a pointer to a pre-allocated array of integers large
 181  * enough to hold 'size' bytes (with 4 bytes to each integer)
 182  */
 183 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 184                 unsigned int *data, int size)
 185 {
 186         struct usb_serial *serial = port->serial;
 187         __le32 *buf;
 188         int result, i, length;
 189
 190         /* Number of integers required to contain the array */
 191         length = (((size - 1) | 3) + 1)/4;
 192
 193         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 194         if (!buf) {
 195                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 196                 return -ENOMEM;
 197         }
 198
 199         /* For get requests, the request number must be incremented */
 200         request++;
 201
 202         /* Issue the request, attempting to read 'size' bytes */
 203         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 204                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 205                                 0, buf, size, 300);
 206
 207         /* Convert data into an array of integers */
 208         for (i=0; i<length; i++)
 209                 data[i] = le32_to_cpu(buf[i]);
 210
 211         kfree(buf);
 212
 213         if (result != size) {
 214                 dev_err(&port->dev, "%s - Unable to send config request, "
 215                                 "request=0x%x size=%d result=%d\n",
 216                                 __FUNCTION__, request, size, result);
 217                 return -EPROTO;
 218         }
 219
 220         return 0;
 221 }
 222
 223 /*
 224  * cp2101_set_config
 225  * Writes to the CP2101 configuration registers
 226  * Values less than 16 bits wide are sent directly
 227  * 'size' is specified in bytes.
 228  */
 229 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 230                 unsigned int *data, int size)
 231 {
 232         struct usb_serial *serial = port->serial;
 233         __le32 *buf;
 234         int result, i, length;
 235
 236         /* Number of integers required to contain the array */
 237         length = (((size - 1) | 3) + 1)/4;
 238
 239         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 240         if (!buf) {
 241                 dev_err(&port->dev, "%s - out of memory.\n",
 242                                 __FUNCTION__);
 243                 return -ENOMEM;
 244         }
 245
 246         /* Array of integers into bytes */
 247         for (i = 0; i < length; i++)
 248                 buf[i] = cpu_to_le32(data[i]);
 249
 250         if (size > 2) {
 251                 result = usb_control_msg (serial->dev,
 252                                 usb_sndctrlpipe(serial->dev, 0),
 253                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 254                                 0, buf, size, 300);
 255         } else {
 256                 result = usb_control_msg (serial->dev,
 257                                 usb_sndctrlpipe(serial->dev, 0),
 258                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 259                                 0, NULL, 0, 300);
 260         }
 261
 262         kfree(buf);
 263
 264         if ((size > 2 && result != size) || result < 0) {
 265                 dev_err(&port->dev, "%s - Unable to send request, "
 266                                 "request=0x%x size=%d result=%d\n",
 267                                 __FUNCTION__, request, size, result);
 268                 return -EPROTO;
 269         }
 270
 271         /* Single data value */
 272         result = usb_control_msg (serial->dev,
 273                         usb_sndctrlpipe(serial->dev, 0),
 274                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 275                         0, NULL, 0, 300);
 276         return 0;
 277 }
 278
 279 /*
 280  * cp2101_set_config_single
 281  * Convenience function for calling cp2101_set_config on single data values
 282  * without requiring an integer pointer
 283  */
 284 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 285                 u8 request, unsigned int data)
 286 {
 287         return cp2101_set_config(port, request, &data, 2);
 288 }
 289
 290 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 291 {
 292         struct usb_serial *serial = port->serial;
 293         int result;
 294
 295         dbg("%s - port %d", __FUNCTION__, port->number);
 296
 297         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 298                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 299                                 __FUNCTION__);
 300                 return -EPROTO;
 301         }
 302
 303         /* Start reading from the device */
 304         usb_fill_bulk_urb (port->read_urb, serial->dev,
 305                         usb_rcvbulkpipe(serial->dev,
 306                         port->bulk_in_endpointAddress),
 307                         port->read_urb->transfer_buffer,
 308                         port->read_urb->transfer_buffer_length,
 309                         serial->type->read_bulk_callback,
 310                         port);
 311         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 312         if (result) {
 313                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 314                                 "error %d\n", __FUNCTION__, result);
 315                 return result;
 316         }
 317
 318         /* Configure the termios structure */
 319         cp2101_get_termios(port);
 320
 321         /* Set the DTR and RTS pins low */
 322         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 323
 324         return 0;
 325 }
 326
 327 static void cp2101_cleanup (struct usb_serial_port *port)
 328 {
 329         struct usb_serial *serial = port->serial;
 330
 331         dbg("%s - port %d", __FUNCTION__, port->number);
 332
 333         if (serial->dev) {
 334                 /* shutdown any bulk reads that might be going on */
 335                 if (serial->num_bulk_out)
 336                         usb_kill_urb(port->write_urb);
 337                 if (serial->num_bulk_in)
 338                         usb_kill_urb(port->read_urb);
 339         }
 340 }
 341
 342 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 343 {
 344         dbg("%s - port %d", __FUNCTION__, port->number);
 345
 346         /* shutdown our urbs */
 347         dbg("%s - shutting down urbs", __FUNCTION__);
 348         usb_kill_urb(port->write_urb);
 349         usb_kill_urb(port->read_urb);
 350
 351         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 352 }
 353
 354 /*
 355  * cp2101_get_termios
 356  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 357  * from the device, corrects any unsupported values, and configures the
 358  * termios structure to reflect the state of the device
 359  */
 360 static void cp2101_get_termios (struct usb_serial_port *port)
 361 {
 362         unsigned int cflag, modem_ctl[4];
 363         int baud;
 364         int bits;
 365
 366         dbg("%s - port %d", __FUNCTION__, port->number);
 367
 368         if (!port->tty || !port->tty->termios) {
 369                 dbg("%s - no tty structures", __FUNCTION__);
 370                 return;
 371         }
 372
 373         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 374         /* Convert to baudrate */
 375         if (baud)
 376                 baud = BAUD_RATE_GEN_FREQ / baud;
 377
 378         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 379
 380         tty_encode_baud_rate(port->tty, baud, baud);
 381         cflag = port->tty->termios->c_cflag;
 382
 383         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 384         cflag &= ~CSIZE;
 385         switch(bits & BITS_DATA_MASK) {
 386                 case BITS_DATA_5:
 387                         dbg("%s - data bits = 5", __FUNCTION__);
 388                         cflag |= CS5;
 389                         break;
 390                 case BITS_DATA_6:
 391                         dbg("%s - data bits = 6", __FUNCTION__);
 392                         cflag |= CS6;
 393                         break;
 394                 case BITS_DATA_7:
 395                         dbg("%s - data bits = 7", __FUNCTION__);
 396                         cflag |= CS7;
 397                         break;
 398                 case BITS_DATA_8:
 399                         dbg("%s - data bits = 8", __FUNCTION__);
 400                         cflag |= CS8;
 401                         break;
 402                 case BITS_DATA_9:
 403                         dbg("%s - data bits = 9 (not supported, "
 404                                         "using 8 data bits)", __FUNCTION__);
 405                         cflag |= CS8;
 406                         bits &= ~BITS_DATA_MASK;
 407                         bits |= BITS_DATA_8;
 408                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 409                         break;
 410                 default:
 411                         dbg("%s - Unknown number of data bits, "
 412                                         "using 8", __FUNCTION__);
 413                         cflag |= CS8;
 414                         bits &= ~BITS_DATA_MASK;
 415                         bits |= BITS_DATA_8;
 416                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 417                         break;
 418         }
 419
 420         switch(bits & BITS_PARITY_MASK) {
 421                 case BITS_PARITY_NONE:
 422                         dbg("%s - parity = NONE", __FUNCTION__);
 423                         cflag &= ~PARENB;
 424                         break;
 425                 case BITS_PARITY_ODD:
 426                         dbg("%s - parity = ODD", __FUNCTION__);
 427                         cflag |= (PARENB|PARODD);
 428                         break;
 429                 case BITS_PARITY_EVEN:
 430                         dbg("%s - parity = EVEN", __FUNCTION__);
 431                         cflag &= ~PARODD;
 432                         cflag |= PARENB;
 433                         break;
 434                 case BITS_PARITY_MARK:
 435                         dbg("%s - parity = MARK (not supported, "
 436                                         "disabling parity)", __FUNCTION__);
 437                         cflag &= ~PARENB;
 438                         bits &= ~BITS_PARITY_MASK;
 439                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 440                         break;
 441                 case BITS_PARITY_SPACE:
 442                         dbg("%s - parity = SPACE (not supported, "
 443                                         "disabling parity)", __FUNCTION__);
 444                         cflag &= ~PARENB;
 445                         bits &= ~BITS_PARITY_MASK;
 446                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 447                         break;
 448                 default:
 449                         dbg("%s - Unknown parity mode, "
 450                                         "disabling parity", __FUNCTION__);
 451                         cflag &= ~PARENB;
 452                         bits &= ~BITS_PARITY_MASK;
 453                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 454                         break;
 455         }
 456
 457         cflag &= ~CSTOPB;
 458         switch(bits & BITS_STOP_MASK) {
 459                 case BITS_STOP_1:
 460                         dbg("%s - stop bits = 1", __FUNCTION__);
 461                         break;
 462                 case BITS_STOP_1_5:
 463                         dbg("%s - stop bits = 1.5 (not supported, "
 464                                         "using 1 stop bit)", __FUNCTION__);
 465                         bits &= ~BITS_STOP_MASK;
 466                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 467                         break;
 468                 case BITS_STOP_2:
 469                         dbg("%s - stop bits = 2", __FUNCTION__);
 470                         cflag |= CSTOPB;
 471                         break;
 472                 default:
 473                         dbg("%s - Unknown number of stop bits, "
 474                                         "using 1 stop bit", __FUNCTION__);
 475                         bits &= ~BITS_STOP_MASK;
 476                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 477                         break;
 478         }
 479
 480         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 481         if (modem_ctl[0] & 0x0008) {
 482                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 483                 cflag |= CRTSCTS;
 484         } else {
 485                 dbg("%s - flow control = NONE", __FUNCTION__);
 486                 cflag &= ~CRTSCTS;
 487         }
 488
 489         port->tty->termios->c_cflag = cflag;
 490 }
 491
 492 static void cp2101_set_termios (struct usb_serial_port *port,
 493                 struct ktermios *old_termios)
 494 {
 495         unsigned int cflag, old_cflag;
 496         int baud=0, bits;
 497         unsigned int modem_ctl[4];
 498
 499         dbg("%s - port %d", __FUNCTION__, port->number);
 500
 501         if (!port->tty || !port->tty->termios) {
 502                 dbg("%s - no tty structures", __FUNCTION__);
 503                 return;
 504         }
 505         port->tty->termios->c_cflag &= ~CMSPAR;
 506
 507         cflag = port->tty->termios->c_cflag;
 508         old_cflag = old_termios->c_cflag;
 509         baud = tty_get_baud_rate(port->tty);
 510
 511         /* If the baud rate is to be updated*/
 512         if (baud != tty_termios_baud_rate(old_termios)) {
 513                 switch (baud) {
 514                         case 0:
 515                         case 600:
 516                         case 1200:
 517                         case 1800:
 518                         case 2400:
 519                         case 4800:
 520                         case 7200:
 521                         case 9600:
 522                         case 14400:
 523                         case 19200:
 524                         case 28800:
 525                         case 38400:
 526                         case 55854:
 527                         case 57600:
 528                         case 115200:
 529                         case 127117:
 530                         case 230400:
 531                         case 460800:
 532                         case 921600:
 533                         case 3686400:
 534                                 break;
 535                         default:
 536                                 baud = 9600;
 537                                 break;
 538                 }
 539
 540                 if (baud) {
 541                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 542                                         baud);
 543                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 544                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 545                                 dev_err(&port->dev, "Baud rate requested not "
 546                                                 "supported by device\n");
 547                                 baud = tty_termios_baud_rate(old_termios);
 548                         }
 549                 }
 550         }
 551         /* Report back the resulting baud rate */
 552         tty_encode_baud_rate(port->tty, baud, baud);
 553
 554         /* If the number of data bits is to be updated */
 555         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 556                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 557                 bits &= ~BITS_DATA_MASK;
 558                 switch (cflag & CSIZE) {
 559                         case CS5:
 560                                 bits |= BITS_DATA_5;
 561                                 dbg("%s - data bits = 5", __FUNCTION__);
 562                                 break;
 563                         case CS6:
 564                                 bits |= BITS_DATA_6;
 565                                 dbg("%s - data bits = 6", __FUNCTION__);
 566                                 break;
 567                         case CS7:
 568                                 bits |= BITS_DATA_7;
 569                                 dbg("%s - data bits = 7", __FUNCTION__);
 570                                 break;
 571                         case CS8:
 572                                 bits |= BITS_DATA_8;
 573                                 dbg("%s - data bits = 8", __FUNCTION__);
 574                                 break;
 575                         /*case CS9:
 576                                 bits |= BITS_DATA_9;
 577                                 dbg("%s - data bits = 9", __FUNCTION__);
 578                                 break;*/
 579                         default:
 580                                 dev_err(&port->dev, "cp2101 driver does not "
 581                                         "support the number of bits requested,"
 582                                         " using 8 bit mode\n");
 583                                 bits |= BITS_DATA_8;
 584                                 break;
 585                 }
 586                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 587                         dev_err(&port->dev, "Number of data bits requested "
 588                                         "not supported by device\n");
 589         }
 590
 591         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 592                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 593                 bits &= ~BITS_PARITY_MASK;
 594                 if (cflag & PARENB) {
 595                         if (cflag & PARODD) {
 596                                 bits |= BITS_PARITY_ODD;
 597                                 dbg("%s - parity = ODD", __FUNCTION__);
 598                         } else {
 599                                 bits |= BITS_PARITY_EVEN;
 600                                 dbg("%s - parity = EVEN", __FUNCTION__);
 601                         }
 602                 }
 603                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 604                         dev_err(&port->dev, "Parity mode not supported "
 605                                         "by device\n");
 606         }
 607
 608         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 609                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 610                 bits &= ~BITS_STOP_MASK;
 611                 if (cflag & CSTOPB) {
 612                         bits |= BITS_STOP_2;
 613                         dbg("%s - stop bits = 2", __FUNCTION__);
 614                 } else {
 615                         bits |= BITS_STOP_1;
 616                         dbg("%s - stop bits = 1", __FUNCTION__);
 617                 }
 618                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 619                         dev_err(&port->dev, "Number of stop bits requested "
 620                                         "not supported by device\n");
 621         }
 622
 623         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 624                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 625                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 626                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 627                                 modem_ctl[2], modem_ctl[3]);
 628
 629                 if (cflag & CRTSCTS) {
 630                         modem_ctl[0] &= ~0x7B;
 631                         modem_ctl[0] |= 0x09;
 632                         modem_ctl[1] = 0x80;
 633                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 634                 } else {
 635                         modem_ctl[0] &= ~0x7B;
 636                         modem_ctl[0] |= 0x01;
 637                         modem_ctl[1] |= 0x40;
 638                         dbg("%s - flow control = NONE", __FUNCTION__);
 639                 }
 640
 641                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 642                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 643                                 modem_ctl[2], modem_ctl[3]);
 644                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 645         }
 646
 647 }
 648
 649 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 650                 unsigned int set, unsigned int clear)
 651 {
 652         int control = 0;
 653
 654         dbg("%s - port %d", __FUNCTION__, port->number);
 655
 656         if (set & TIOCM_RTS) {
 657                 control |= CONTROL_RTS;
 658                 control |= CONTROL_WRITE_RTS;
 659         }
 660         if (set & TIOCM_DTR) {
 661                 control |= CONTROL_DTR;
 662                 control |= CONTROL_WRITE_DTR;
 663         }
 664         if (clear & TIOCM_RTS) {
 665                 control &= ~CONTROL_RTS;
 666                 control |= CONTROL_WRITE_RTS;
 667         }
 668         if (clear & TIOCM_DTR) {
 669                 control &= ~CONTROL_DTR;
 670                 control |= CONTROL_WRITE_DTR;
 671         }
 672
 673         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 674
 675         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 676
 677 }
 678
 679 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 680 {
 681         int control, result;
 682
 683         dbg("%s - port %d", __FUNCTION__, port->number);
 684
 685         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 686
 687         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 688                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 689                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 690                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 691                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 692                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 693
 694         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 695
 696         return result;
 697 }
 698
 699 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 700 {
 701         int state;
 702
 703         dbg("%s - port %d", __FUNCTION__, port->number);
 704         if (break_state == 0)
 705                 state = BREAK_OFF;
 706         else
 707                 state = BREAK_ON;
 708         dbg("%s - turning break %s", __FUNCTION__,
 709                         state==BREAK_OFF ? "off" : "on");
 710         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 711 }
 712
 713 static int cp2101_startup (struct usb_serial *serial)
 714 {
 715         /* CP2101 buffers behave strangely unless device is reset */
 716         usb_reset_device(serial->dev);
 717         return 0;
 718 }
 719
 720 static void cp2101_shutdown (struct usb_serial *serial)
 721 {
 722         int i;
 723
 724         dbg("%s", __FUNCTION__);
 725
 726         /* Stop reads and writes on all ports */
 727         for (i=0; i < serial->num_ports; ++i) {
 728                 cp2101_cleanup(serial->port[i]);
 729         }
 730 }
 731
 732 static int __init cp2101_init (void)
 733 {
 734         int retval;
 735
 736         retval = usb_serial_register(&cp2101_device);
 737         if (retval)
 738                 return retval; /* Failed to register */
 739
 740         retval = usb_register(&cp2101_driver);
 741         if (retval) {
 742                 /* Failed to register */
 743                 usb_serial_deregister(&cp2101_device);
 744                 return retval;
 745         }
 746
 747         /* Success */
 748         info(DRIVER_DESC " " DRIVER_VERSION);
 749         return 0;
 750 }
 751
 752 static void __exit cp2101_exit (void)
 753 {
 754         usb_deregister (&cp2101_driver);
 755         usb_serial_deregister (&cp2101_device);
 756 }
 757
 758 module_init(cp2101_init);
 759 module_exit(cp2101_exit);
 760
 761 MODULE_DESCRIPTION(DRIVER_DESC);
 762 MODULE_VERSION(DRIVER_VERSION);
 763 MODULE_LICENSE("GPL");
 764
 765 module_param(debug, bool, S_IRUGO | S_IWUSR);
 766 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");