drivers/usb/serial/cp2101.c

   1 /*
   2  * Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
   3  *
   4  * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License version
   8  *      2 as published by the Free Software Foundation.
   9  *
  10  * Support to set flow control line levels using TIOCMGET and TIOCMSET
  11  * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow
  12  * control thanks to Munir Nassar nassarmu@real-time.com
  13  *
  14  * Outstanding Issues:
  15  *  Buffers are not flushed when the port is opened.
  16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/usb.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/usb/serial.h>
  30
  31 /*
  32  * Version Information
  33  */
  34 #define DRIVER_VERSION "v0.07"
  35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  36
  37 /*
  38  * Function Prototypes
  39  */
  40 static int cp2101_open(struct usb_serial_port*, struct file*);
  41 static void cp2101_cleanup(struct usb_serial_port*);
  42 static void cp2101_close(struct usb_serial_port*, struct file*);
  43 static void cp2101_get_termios(struct usb_serial_port*);
  44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
  45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  47                 unsigned int, unsigned int);
  48 static void cp2101_break_ctl(struct usb_serial_port*, int);
  49 static int cp2101_startup (struct usb_serial *);
  50 static void cp2101_shutdown(struct usb_serial*);
  51
  52
  53 static int debug;
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  57         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  58         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  59         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  60         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  61         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  62         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  63         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  64         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  65         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  66         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  67         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  68         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  69         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  70         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  71         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  72         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  73         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  74         { } /* Terminating Entry */
  75 };
  76
  77 MODULE_DEVICE_TABLE (usb, id_table);
  78
  79 static struct usb_driver cp2101_driver = {
  80         .name           = "cp2101",
  81         .probe          = usb_serial_probe,
  82         .disconnect     = usb_serial_disconnect,
  83         .id_table       = id_table,
  84         .no_dynamic_id  =       1,
  85 };
  86
  87 static struct usb_serial_driver cp2101_device = {
  88         .driver = {
  89                 .owner =        THIS_MODULE,
  90                 .name =         "cp2101",
  91         },
  92         .id_table               = id_table,
  93         .num_interrupt_in       = 0,
  94         .num_bulk_in            = 0,
  95         .num_bulk_out           = 0,
  96         .num_ports              = 1,
  97         .open                   = cp2101_open,
  98         .close                  = cp2101_close,
  99         .break_ctl              = cp2101_break_ctl,
 100         .set_termios            = cp2101_set_termios,
 101         .tiocmget               = cp2101_tiocmget,
 102         .tiocmset               = cp2101_tiocmset,
 103         .attach                 = cp2101_startup,
 104         .shutdown               = cp2101_shutdown,
 105 };
 106
 107 /* Config request types */
 108 #define REQTYPE_HOST_TO_DEVICE  0x41
 109 #define REQTYPE_DEVICE_TO_HOST  0xc1
 110
 111 /* Config SET requests. To GET, add 1 to the request number */
 112 #define CP2101_UART             0x00    /* Enable / Disable */
 113 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 114 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 115 #define CP2101_BREAK            0x05    /* On / Off */
 116 #define CP2101_CONTROL          0x07    /* Flow control line states */
 117 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 118 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 119
 120 /* CP2101_UART */
 121 #define UART_ENABLE             0x0001
 122 #define UART_DISABLE            0x0000
 123
 124 /* CP2101_BAUDRATE */
 125 #define BAUD_RATE_GEN_FREQ      0x384000
 126
 127 /* CP2101_BITS */
 128 #define BITS_DATA_MASK          0X0f00
 129 #define BITS_DATA_5             0X0500
 130 #define BITS_DATA_6             0X0600
 131 #define BITS_DATA_7             0X0700
 132 #define BITS_DATA_8             0X0800
 133 #define BITS_DATA_9             0X0900
 134
 135 #define BITS_PARITY_MASK        0x00f0
 136 #define BITS_PARITY_NONE        0x0000
 137 #define BITS_PARITY_ODD         0x0010
 138 #define BITS_PARITY_EVEN        0x0020
 139 #define BITS_PARITY_MARK        0x0030
 140 #define BITS_PARITY_SPACE       0x0040
 141
 142 #define BITS_STOP_MASK          0x000f
 143 #define BITS_STOP_1             0x0000
 144 #define BITS_STOP_1_5           0x0001
 145 #define BITS_STOP_2             0x0002
 146
 147 /* CP2101_BREAK */
 148 #define BREAK_ON                0x0000
 149 #define BREAK_OFF               0x0001
 150
 151 /* CP2101_CONTROL */
 152 #define CONTROL_DTR             0x0001
 153 #define CONTROL_RTS             0x0002
 154 #define CONTROL_CTS             0x0010
 155 #define CONTROL_DSR             0x0020
 156 #define CONTROL_RING            0x0040
 157 #define CONTROL_DCD             0x0080
 158 #define CONTROL_WRITE_DTR       0x0100
 159 #define CONTROL_WRITE_RTS       0x0200
 160
 161 /*
 162  * cp2101_get_config
 163  * Reads from the CP2101 configuration registers
 164  * 'size' is specified in bytes.
 165  * 'data' is a pointer to a pre-allocated array of integers large
 166  * enough to hold 'size' bytes (with 4 bytes to each integer)
 167  */
 168 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 169                 unsigned int *data, int size)
 170 {
 171         struct usb_serial *serial = port->serial;
 172         u32 *buf;
 173         int result, i, length;
 174
 175         /* Number of integers required to contain the array */
 176         length = (((size - 1) | 3) + 1)/4;
 177
 178         buf = kcalloc(length, sizeof(u32), GFP_KERNEL);
 179         if (!buf) {
 180                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 181                 return -ENOMEM;
 182         }
 183
 184         /* For get requests, the request number must be incremented */
 185         request++;
 186
 187         /* Issue the request, attempting to read 'size' bytes */
 188         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 189                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 190                                 0, buf, size, 300);
 191
 192         /* Convert data into an array of integers */
 193         for (i=0; i<length; i++)
 194                 data[i] = le32_to_cpu(buf[i]);
 195
 196         kfree(buf);
 197
 198         if (result != size) {
 199                 dev_err(&port->dev, "%s - Unable to send config request, "
 200                                 "request=0x%x size=%d result=%d\n",
 201                                 __FUNCTION__, request, size, result);
 202                 return -EPROTO;
 203         }
 204
 205         return 0;
 206 }
 207
 208 /*
 209  * cp2101_set_config
 210  * Writes to the CP2101 configuration registers
 211  * Values less than 16 bits wide are sent directly
 212  * 'size' is specified in bytes.
 213  */
 214 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 215                 unsigned int *data, int size)
 216 {
 217         struct usb_serial *serial = port->serial;
 218         u32 *buf;
 219         int result, i, length;
 220
 221         /* Number of integers required to contain the array */
 222         length = (((size - 1) | 3) + 1)/4;
 223
 224         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 225         if (!buf) {
 226                 dev_err(&port->dev, "%s - out of memory.\n",
 227                                 __FUNCTION__);
 228                 return -ENOMEM;
 229         }
 230
 231         /* Array of integers into bytes */
 232         for (i = 0; i < length; i++)
 233                 buf[i] = cpu_to_le32(data[i]);
 234
 235         if (size > 2) {
 236                 result = usb_control_msg (serial->dev,
 237                                 usb_sndctrlpipe(serial->dev, 0),
 238                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 239                                 0, buf, size, 300);
 240         } else {
 241                 result = usb_control_msg (serial->dev,
 242                                 usb_sndctrlpipe(serial->dev, 0),
 243                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 244                                 0, NULL, 0, 300);
 245         }
 246
 247         kfree(buf);
 248
 249         if ((size > 2 && result != size) || result < 0) {
 250                 dev_err(&port->dev, "%s - Unable to send request, "
 251                                 "request=0x%x size=%d result=%d\n",
 252                                 __FUNCTION__, request, size, result);
 253                 return -EPROTO;
 254         }
 255
 256         /* Single data value */
 257         result = usb_control_msg (serial->dev,
 258                         usb_sndctrlpipe(serial->dev, 0),
 259                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 260                         0, NULL, 0, 300);
 261         return 0;
 262 }
 263
 264 /*
 265  * cp2101_set_config_single
 266  * Convenience function for calling cp2101_set_config on single data values
 267  * without requiring an integer pointer
 268  */
 269 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 270                 u8 request, unsigned int data)
 271 {
 272         return cp2101_set_config(port, request, &data, 2);
 273 }
 274
 275 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 276 {
 277         struct usb_serial *serial = port->serial;
 278         int result;
 279
 280         dbg("%s - port %d", __FUNCTION__, port->number);
 281
 282         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 283                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 284                                 __FUNCTION__);
 285                 return -EPROTO;
 286         }
 287
 288         /* Start reading from the device */
 289         usb_fill_bulk_urb (port->read_urb, serial->dev,
 290                         usb_rcvbulkpipe(serial->dev,
 291                         port->bulk_in_endpointAddress),
 292                         port->read_urb->transfer_buffer,
 293                         port->read_urb->transfer_buffer_length,
 294                         serial->type->read_bulk_callback,
 295                         port);
 296         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 297         if (result) {
 298                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 299                                 "error %d\n", __FUNCTION__, result);
 300                 return result;
 301         }
 302
 303         /* Configure the termios structure */
 304         cp2101_get_termios(port);
 305
 306         /* Set the DTR and RTS pins low */
 307         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 308
 309         return 0;
 310 }
 311
 312 static void cp2101_cleanup (struct usb_serial_port *port)
 313 {
 314         struct usb_serial *serial = port->serial;
 315
 316         dbg("%s - port %d", __FUNCTION__, port->number);
 317
 318         if (serial->dev) {
 319                 /* shutdown any bulk reads that might be going on */
 320                 if (serial->num_bulk_out)
 321                         usb_kill_urb(port->write_urb);
 322                 if (serial->num_bulk_in)
 323                         usb_kill_urb(port->read_urb);
 324         }
 325 }
 326
 327 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 328 {
 329         dbg("%s - port %d", __FUNCTION__, port->number);
 330
 331         /* shutdown our urbs */
 332         dbg("%s - shutting down urbs", __FUNCTION__);
 333         usb_kill_urb(port->write_urb);
 334         usb_kill_urb(port->read_urb);
 335
 336         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 337 }
 338
 339 /*
 340  * cp2101_get_termios
 341  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 342  * from the device, corrects any unsupported values, and configures the
 343  * termios structure to reflect the state of the device
 344  */
 345 static void cp2101_get_termios (struct usb_serial_port *port)
 346 {
 347         unsigned int cflag, modem_ctl[4];
 348         int baud;
 349         int bits;
 350
 351         dbg("%s - port %d", __FUNCTION__, port->number);
 352
 353         if ((!port->tty) || (!port->tty->termios)) {
 354                 dbg("%s - no tty structures", __FUNCTION__);
 355                 return;
 356         }
 357         cflag = port->tty->termios->c_cflag;
 358
 359         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 360         /* Convert to baudrate */
 361         if (baud)
 362                 baud = BAUD_RATE_GEN_FREQ / baud;
 363
 364         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 365         cflag &= ~CBAUD;
 366         switch (baud) {
 367                 /*
 368                  * The baud rates which are commented out below
 369                  * appear to be supported by the device
 370                  * but are non-standard
 371                  */
 372                 case 600:       cflag |= B600;          break;
 373                 case 1200:      cflag |= B1200;         break;
 374                 case 1800:      cflag |= B1800;         break;
 375                 case 2400:      cflag |= B2400;         break;
 376                 case 4800:      cflag |= B4800;         break;
 377                 /*case 7200:    cflag |= B7200;         break;*/
 378                 case 9600:      cflag |= B9600;         break;
 379                 /*case 14400:   cflag |= B14400;        break;*/
 380                 case 19200:     cflag |= B19200;        break;
 381                 /*case 28800:   cflag |= B28800;        break;*/
 382                 case 38400:     cflag |= B38400;        break;
 383                 /*case 55854:   cflag |= B55054;        break;*/
 384                 case 57600:     cflag |= B57600;        break;
 385                 case 115200:    cflag |= B115200;       break;
 386                 /*case 127117:  cflag |= B127117;       break;*/
 387                 case 230400:    cflag |= B230400;       break;
 388                 case 460800:    cflag |= B460800;       break;
 389                 case 921600:    cflag |= B921600;       break;
 390                 /*case 3686400: cflag |= B3686400;      break;*/
 391                 default:
 392                         dbg("%s - Baud rate is not supported, "
 393                                         "using 9600 baud", __FUNCTION__);
 394                         cflag |= B9600;
 395                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 396                                         (BAUD_RATE_GEN_FREQ/9600));
 397                         break;
 398         }
 399
 400         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 401         cflag &= ~CSIZE;
 402         switch(bits & BITS_DATA_MASK) {
 403                 case BITS_DATA_5:
 404                         dbg("%s - data bits = 5", __FUNCTION__);
 405                         cflag |= CS5;
 406                         break;
 407                 case BITS_DATA_6:
 408                         dbg("%s - data bits = 6", __FUNCTION__);
 409                         cflag |= CS6;
 410                         break;
 411                 case BITS_DATA_7:
 412                         dbg("%s - data bits = 7", __FUNCTION__);
 413                         cflag |= CS7;
 414                         break;
 415                 case BITS_DATA_8:
 416                         dbg("%s - data bits = 8", __FUNCTION__);
 417                         cflag |= CS8;
 418                         break;
 419                 case BITS_DATA_9:
 420                         dbg("%s - data bits = 9 (not supported, "
 421                                         "using 8 data bits)", __FUNCTION__);
 422                         cflag |= CS8;
 423                         bits &= ~BITS_DATA_MASK;
 424                         bits |= BITS_DATA_8;
 425                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 426                         break;
 427                 default:
 428                         dbg("%s - Unknown number of data bits, "
 429                                         "using 8", __FUNCTION__);
 430                         cflag |= CS8;
 431                         bits &= ~BITS_DATA_MASK;
 432                         bits |= BITS_DATA_8;
 433                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 434                         break;
 435         }
 436
 437         switch(bits & BITS_PARITY_MASK) {
 438                 case BITS_PARITY_NONE:
 439                         dbg("%s - parity = NONE", __FUNCTION__);
 440                         cflag &= ~PARENB;
 441                         break;
 442                 case BITS_PARITY_ODD:
 443                         dbg("%s - parity = ODD", __FUNCTION__);
 444                         cflag |= (PARENB|PARODD);
 445                         break;
 446                 case BITS_PARITY_EVEN:
 447                         dbg("%s - parity = EVEN", __FUNCTION__);
 448                         cflag &= ~PARODD;
 449                         cflag |= PARENB;
 450                         break;
 451                 case BITS_PARITY_MARK:
 452                         dbg("%s - parity = MARK (not supported, "
 453                                         "disabling parity)", __FUNCTION__);
 454                         cflag &= ~PARENB;
 455                         bits &= ~BITS_PARITY_MASK;
 456                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 457                         break;
 458                 case BITS_PARITY_SPACE:
 459                         dbg("%s - parity = SPACE (not supported, "
 460                                         "disabling parity)", __FUNCTION__);
 461                         cflag &= ~PARENB;
 462                         bits &= ~BITS_PARITY_MASK;
 463                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 464                         break;
 465                 default:
 466                         dbg("%s - Unknown parity mode, "
 467                                         "disabling parity", __FUNCTION__);
 468                         cflag &= ~PARENB;
 469                         bits &= ~BITS_PARITY_MASK;
 470                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 471                         break;
 472         }
 473
 474         cflag &= ~CSTOPB;
 475         switch(bits & BITS_STOP_MASK) {
 476                 case BITS_STOP_1:
 477                         dbg("%s - stop bits = 1", __FUNCTION__);
 478                         break;
 479                 case BITS_STOP_1_5:
 480                         dbg("%s - stop bits = 1.5 (not supported, "
 481                                         "using 1 stop bit)", __FUNCTION__);
 482                         bits &= ~BITS_STOP_MASK;
 483                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 484                         break;
 485                 case BITS_STOP_2:
 486                         dbg("%s - stop bits = 2", __FUNCTION__);
 487                         cflag |= CSTOPB;
 488                         break;
 489                 default:
 490                         dbg("%s - Unknown number of stop bits, "
 491                                         "using 1 stop bit", __FUNCTION__);
 492                         bits &= ~BITS_STOP_MASK;
 493                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 494                         break;
 495         }
 496
 497         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 498         if (modem_ctl[0] & 0x0008) {
 499                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 500                 cflag |= CRTSCTS;
 501         } else {
 502                 dbg("%s - flow control = NONE", __FUNCTION__);
 503                 cflag &= ~CRTSCTS;
 504         }
 505
 506         port->tty->termios->c_cflag = cflag;
 507 }
 508
 509 static void cp2101_set_termios (struct usb_serial_port *port,
 510                 struct ktermios *old_termios)
 511 {
 512         unsigned int cflag, old_cflag=0;
 513         int baud=0, bits;
 514         unsigned int modem_ctl[4];
 515
 516         dbg("%s - port %d", __FUNCTION__, port->number);
 517
 518         if ((!port->tty) || (!port->tty->termios)) {
 519                 dbg("%s - no tty structures", __FUNCTION__);
 520                 return;
 521         }
 522         cflag = port->tty->termios->c_cflag;
 523
 524         /* Check that they really want us to change something */
 525         if (old_termios) {
 526                 if ((cflag == old_termios->c_cflag) &&
 527                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 528                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 529                         dbg("%s - nothing to change...", __FUNCTION__);
 530                         return;
 531                 }
 532
 533                 old_cflag = old_termios->c_cflag;
 534         }
 535
 536         /* If the baud rate is to be updated*/
 537         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 538                 switch (cflag & CBAUD) {
 539                         /*
 540                          * The baud rates which are commented out below
 541                          * appear to be supported by the device
 542                          * but are non-standard
 543                          */
 544                         case B0:        baud = 0;       break;
 545                         case B600:      baud = 600;     break;
 546                         case B1200:     baud = 1200;    break;
 547                         case B1800:     baud = 1800;    break;
 548                         case B2400:     baud = 2400;    break;
 549                         case B4800:     baud = 4800;    break;
 550                         /*case B7200:   baud = 7200;    break;*/
 551                         case B9600:     baud = 9600;    break;
 552                         /*ase B14400:   baud = 14400;   break;*/
 553                         case B19200:    baud = 19200;   break;
 554                         /*case B28800:  baud = 28800;   break;*/
 555                         case B38400:    baud = 38400;   break;
 556                         /*case B55854:  baud = 55054;   break;*/
 557                         case B57600:    baud = 57600;   break;
 558                         case B115200:   baud = 115200;  break;
 559                         /*case B127117: baud = 127117;  break;*/
 560                         case B230400:   baud = 230400;  break;
 561                         case B460800:   baud = 460800;  break;
 562                         case B921600:   baud = 921600;  break;
 563                         /*case B3686400:        baud = 3686400; break;*/
 564                         default:
 565                                 dev_err(&port->dev, "cp2101 driver does not "
 566                                         "support the baudrate requested\n");
 567                                 break;
 568                 }
 569
 570                 if (baud) {
 571                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 572                                         baud);
 573                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 574                                                 (BAUD_RATE_GEN_FREQ / baud)))
 575                                 dev_err(&port->dev, "Baud rate requested not "
 576                                                 "supported by device\n");
 577                 }
 578         }
 579
 580         /* If the number of data bits is to be updated */
 581         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 582                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 583                 bits &= ~BITS_DATA_MASK;
 584                 switch (cflag & CSIZE) {
 585                         case CS5:
 586                                 bits |= BITS_DATA_5;
 587                                 dbg("%s - data bits = 5", __FUNCTION__);
 588                                 break;
 589                         case CS6:
 590                                 bits |= BITS_DATA_6;
 591                                 dbg("%s - data bits = 6", __FUNCTION__);
 592                                 break;
 593                         case CS7:
 594                                 bits |= BITS_DATA_7;
 595                                 dbg("%s - data bits = 7", __FUNCTION__);
 596                                 break;
 597                         case CS8:
 598                                 bits |= BITS_DATA_8;
 599                                 dbg("%s - data bits = 8", __FUNCTION__);
 600                                 break;
 601                         /*case CS9:
 602                                 bits |= BITS_DATA_9;
 603                                 dbg("%s - data bits = 9", __FUNCTION__);
 604                                 break;*/
 605                         default:
 606                                 dev_err(&port->dev, "cp2101 driver does not "
 607                                         "support the number of bits requested,"
 608                                         " using 8 bit mode\n");
 609                                 bits |= BITS_DATA_8;
 610                                 break;
 611                 }
 612                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 613                         dev_err(&port->dev, "Number of data bits requested "
 614                                         "not supported by device\n");
 615         }
 616
 617         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 618                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 619                 bits &= ~BITS_PARITY_MASK;
 620                 if (cflag & PARENB) {
 621                         if (cflag & PARODD) {
 622                                 bits |= BITS_PARITY_ODD;
 623                                 dbg("%s - parity = ODD", __FUNCTION__);
 624                         } else {
 625                                 bits |= BITS_PARITY_EVEN;
 626                                 dbg("%s - parity = EVEN", __FUNCTION__);
 627                         }
 628                 }
 629                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 630                         dev_err(&port->dev, "Parity mode not supported "
 631                                         "by device\n");
 632         }
 633
 634         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 635                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 636                 bits &= ~BITS_STOP_MASK;
 637                 if (cflag & CSTOPB) {
 638                         bits |= BITS_STOP_2;
 639                         dbg("%s - stop bits = 2", __FUNCTION__);
 640                 } else {
 641                         bits |= BITS_STOP_1;
 642                         dbg("%s - stop bits = 1", __FUNCTION__);
 643                 }
 644                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 645                         dev_err(&port->dev, "Number of stop bits requested "
 646                                         "not supported by device\n");
 647         }
 648
 649         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 650                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 651                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 652                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 653                                 modem_ctl[2], modem_ctl[3]);
 654
 655                 if (cflag & CRTSCTS) {
 656                         modem_ctl[0] &= ~0x7B;
 657                         modem_ctl[0] |= 0x09;
 658                         modem_ctl[1] = 0x80;
 659                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 660                 } else {
 661                         modem_ctl[0] &= ~0x7B;
 662                         modem_ctl[0] |= 0x01;
 663                         modem_ctl[1] |= 0x40;
 664                         dbg("%s - flow control = NONE", __FUNCTION__);
 665                 }
 666
 667                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 668                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 669                                 modem_ctl[2], modem_ctl[3]);
 670                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 671         }
 672
 673 }
 674
 675 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 676                 unsigned int set, unsigned int clear)
 677 {
 678         int control = 0;
 679
 680         dbg("%s - port %d", __FUNCTION__, port->number);
 681
 682         if (set & TIOCM_RTS) {
 683                 control |= CONTROL_RTS;
 684                 control |= CONTROL_WRITE_RTS;
 685         }
 686         if (set & TIOCM_DTR) {
 687                 control |= CONTROL_DTR;
 688                 control |= CONTROL_WRITE_DTR;
 689         }
 690         if (clear & TIOCM_RTS) {
 691                 control &= ~CONTROL_RTS;
 692                 control |= CONTROL_WRITE_RTS;
 693         }
 694         if (clear & TIOCM_DTR) {
 695                 control &= ~CONTROL_DTR;
 696                 control |= CONTROL_WRITE_DTR;
 697         }
 698
 699         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 700
 701         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 702
 703 }
 704
 705 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 706 {
 707         int control, result;
 708
 709         dbg("%s - port %d", __FUNCTION__, port->number);
 710
 711         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 712
 713         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 714                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 715                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 716                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 717                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 718                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 719
 720         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 721
 722         return result;
 723 }
 724
 725 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 726 {
 727         int state;
 728
 729         dbg("%s - port %d", __FUNCTION__, port->number);
 730         if (break_state == 0)
 731                 state = BREAK_OFF;
 732         else
 733                 state = BREAK_ON;
 734         dbg("%s - turning break %s", __FUNCTION__,
 735                         state==BREAK_OFF ? "off" : "on");
 736         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 737 }
 738
 739 static int cp2101_startup (struct usb_serial *serial)
 740 {
 741         /* CP2101 buffers behave strangely unless device is reset */
 742         usb_reset_device(serial->dev);
 743         return 0;
 744 }
 745
 746 static void cp2101_shutdown (struct usb_serial *serial)
 747 {
 748         int i;
 749
 750         dbg("%s", __FUNCTION__);
 751
 752         /* Stop reads and writes on all ports */
 753         for (i=0; i < serial->num_ports; ++i) {
 754                 cp2101_cleanup(serial->port[i]);
 755         }
 756 }
 757
 758 static int __init cp2101_init (void)
 759 {
 760         int retval;
 761
 762         retval = usb_serial_register(&cp2101_device);
 763         if (retval)
 764                 return retval; /* Failed to register */
 765
 766         retval = usb_register(&cp2101_driver);
 767         if (retval) {
 768                 /* Failed to register */
 769                 usb_serial_deregister(&cp2101_device);
 770                 return retval;
 771         }
 772
 773         /* Success */
 774         info(DRIVER_DESC " " DRIVER_VERSION);
 775         return 0;
 776 }
 777
 778 static void __exit cp2101_exit (void)
 779 {
 780         usb_deregister (&cp2101_driver);
 781         usb_serial_deregister (&cp2101_device);
 782 }
 783
 784 module_init(cp2101_init);
 785 module_exit(cp2101_exit);
 786
 787 MODULE_DESCRIPTION(DRIVER_DESC);
 788 MODULE_VERSION(DRIVER_VERSION);
 789 MODULE_LICENSE("GPL");
 790
 791 module_param(debug, bool, S_IRUGO | S_IWUSR);
 792 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");