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/config.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/slab.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/usb.h>
  29 #include <asm/uaccess.h>
  30 #include "usb-serial.h"
  31
  32 /*
  33  * Version Information
  34  */
  35 #define DRIVER_VERSION "v0.05"
  36 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  37
  38 /*
  39  * Function Prototypes
  40  */
  41 static int cp2101_open(struct usb_serial_port*, struct file*);
  42 static void cp2101_cleanup(struct usb_serial_port*);
  43 static void cp2101_close(struct usb_serial_port*, struct file*);
  44 static void cp2101_get_termios(struct usb_serial_port*);
  45 static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
  46 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  47 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  48                 unsigned int, unsigned int);
  49 static void cp2101_break_ctl(struct usb_serial_port*, int);
  50 static int cp2101_startup (struct usb_serial *);
  51 static void cp2101_shutdown(struct usb_serial*);
  52
  53
  54 static int debug;
  55
  56 static struct usb_device_id id_table [] = {
  57         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  58         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  59         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  60         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  63         { } /* Terminating Entry */
  64 };
  65
  66 MODULE_DEVICE_TABLE (usb, id_table);
  67
  68 static struct usb_driver cp2101_driver = {
  69         .owner          = THIS_MODULE,
  70         .name           = "CP2101",
  71         .probe          = usb_serial_probe,
  72         .disconnect     = usb_serial_disconnect,
  73         .id_table       = id_table,
  74 };
  75
  76 static struct usb_serial_device_type cp2101_device = {
  77         .owner                  = THIS_MODULE,
  78         .name                   = "CP2101",
  79         .id_table               = id_table,
  80         .num_interrupt_in       = 0,
  81         .num_bulk_in            = 0,
  82         .num_bulk_out           = 0,
  83         .num_ports              = 1,
  84         .open                   = cp2101_open,
  85         .close                  = cp2101_close,
  86         .break_ctl              = cp2101_break_ctl,
  87         .set_termios            = cp2101_set_termios,
  88         .tiocmget               = cp2101_tiocmget,
  89         .tiocmset               = cp2101_tiocmset,
  90         .attach                 = cp2101_startup,
  91         .shutdown               = cp2101_shutdown,
  92 };
  93
  94 /* Config request types */
  95 #define REQTYPE_HOST_TO_DEVICE  0x41
  96 #define REQTYPE_DEVICE_TO_HOST  0xc1
  97
  98 /* Config SET requests. To GET, add 1 to the request number */
  99 #define CP2101_UART             0x00    /* Enable / Disable */
 100 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 101 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 102 #define CP2101_BREAK            0x05    /* On / Off */
 103 #define CP2101_CONTROL          0x07    /* Flow control line states */
 104 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 105 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 106
 107 /* CP2101_UART */
 108 #define UART_ENABLE             0x0001
 109 #define UART_DISABLE            0x0000
 110
 111 /* CP2101_BAUDRATE */
 112 #define BAUD_RATE_GEN_FREQ      0x384000
 113
 114 /* CP2101_BITS */
 115 #define BITS_DATA_MASK          0X0f00
 116 #define BITS_DATA_5             0X0500
 117 #define BITS_DATA_6             0X0600
 118 #define BITS_DATA_7             0X0700
 119 #define BITS_DATA_8             0X0800
 120 #define BITS_DATA_9             0X0900
 121
 122 #define BITS_PARITY_MASK        0x00f0
 123 #define BITS_PARITY_NONE        0x0000
 124 #define BITS_PARITY_ODD         0x0010
 125 #define BITS_PARITY_EVEN        0x0020
 126 #define BITS_PARITY_MARK        0x0030
 127 #define BITS_PARITY_SPACE       0x0040
 128
 129 #define BITS_STOP_MASK          0x000f
 130 #define BITS_STOP_1             0x0000
 131 #define BITS_STOP_1_5           0x0001
 132 #define BITS_STOP_2             0x0002
 133
 134 /* CP2101_BREAK */
 135 #define BREAK_ON                0x0000
 136 #define BREAK_OFF               0x0001
 137
 138 /* CP2101_CONTROL */
 139 #define CONTROL_DTR             0x0001
 140 #define CONTROL_RTS             0x0002
 141 #define CONTROL_CTS             0x0010
 142 #define CONTROL_DSR             0x0020
 143 #define CONTROL_RING            0x0040
 144 #define CONTROL_DCD             0x0080
 145 #define CONTROL_WRITE_DTR       0x0100
 146 #define CONTROL_WRITE_RTS       0x0200
 147
 148 /*
 149  * cp2101_get_config
 150  * Reads from the CP2101 configuration registers
 151  * 'size' is specified in bytes.
 152  * 'data' is a pointer to a pre-allocated array of integers large
 153  * enough to hold 'size' bytes (with 4 bytes to each integer)
 154  */
 155 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 156                 unsigned int *data, int size)
 157 {
 158         struct usb_serial *serial = port->serial;
 159         u32 *buf;
 160         int result, i, length;
 161
 162         /* Number of integers required to contain the array */
 163         length = (((size - 1) | 3) + 1)/4;
 164
 165         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
 166         memset(buf, 0, length * sizeof(u32));
 167
 168         if (!buf) {
 169                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 170                 return -ENOMEM;
 171         }
 172
 173         /* For get requests, the request number must be incremented */
 174         request++;
 175
 176         /* Issue the request, attempting to read 'size' bytes */
 177         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 178                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 179                                 0, buf, size, 300);
 180
 181         /* Convert data into an array of integers */
 182         for (i=0; i<length; i++)
 183                 data[i] = le32_to_cpu(buf[i]);
 184
 185         kfree(buf);
 186
 187         if (result != size) {
 188                 dev_err(&port->dev, "%s - Unable to send config request, "
 189                                 "request=0x%x size=%d result=%d\n",
 190                                 __FUNCTION__, request, size, result);
 191                 return -EPROTO;
 192         }
 193
 194         return 0;
 195 }
 196
 197 /*
 198  * cp2101_set_config
 199  * Writes to the CP2101 configuration registers
 200  * Values less than 16 bits wide are sent directly
 201  * 'size' is specified in bytes.
 202  */
 203 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 204                 unsigned int *data, int size)
 205 {
 206         struct usb_serial *serial = port->serial;
 207         u32 *buf;
 208         int result, i, length;
 209
 210         /* Number of integers required to contain the array */
 211         length = (((size - 1) | 3) + 1)/4;
 212
 213         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 214         if (!buf) {
 215                 dev_err(&port->dev, "%s - out of memory.\n",
 216                                 __FUNCTION__);
 217                 return -ENOMEM;
 218         }
 219
 220         /* Array of integers into bytes */
 221         for (i = 0; i < length; i++)
 222                 buf[i] = cpu_to_le32(data[i]);
 223
 224         if (size > 2) {
 225                 result = usb_control_msg (serial->dev,
 226                                 usb_sndctrlpipe(serial->dev, 0),
 227                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 228                                 0, buf, size, 300);
 229         } else {
 230                 result = usb_control_msg (serial->dev,
 231                                 usb_sndctrlpipe(serial->dev, 0),
 232                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 233                                 0, NULL, 0, 300);
 234         }
 235
 236         kfree(buf);
 237
 238         if ((size > 2 && result != size) || result < 0) {
 239                 dev_err(&port->dev, "%s - Unable to send request, "
 240                                 "request=0x%x size=%d result=%d\n",
 241                                 __FUNCTION__, request, size, result);
 242                 return -EPROTO;
 243         }
 244
 245         /* Single data value */
 246         result = usb_control_msg (serial->dev,
 247                         usb_sndctrlpipe(serial->dev, 0),
 248                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 249                         0, NULL, 0, 300);
 250         return 0;
 251 }
 252
 253 /*
 254  * cp2101_set_config_single
 255  * Convenience function for calling cp2101_set_config on single data values
 256  * without requiring an integer pointer
 257  */
 258 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 259                 u8 request, unsigned int data)
 260 {
 261         return cp2101_set_config(port, request, &data, 2);
 262 }
 263
 264 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 265 {
 266         struct usb_serial *serial = port->serial;
 267         int result;
 268
 269         dbg("%s - port %d", __FUNCTION__, port->number);
 270
 271         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 272                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 273                                 __FUNCTION__);
 274                 return -EPROTO;
 275         }
 276
 277         /* Start reading from the device */
 278         usb_fill_bulk_urb (port->read_urb, serial->dev,
 279                         usb_rcvbulkpipe(serial->dev,
 280                         port->bulk_in_endpointAddress),
 281                         port->read_urb->transfer_buffer,
 282                         port->read_urb->transfer_buffer_length,
 283                         serial->type->read_bulk_callback,
 284                         port);
 285         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 286         if (result) {
 287                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 288                                 "error %d\n", __FUNCTION__, result);
 289                 return result;
 290         }
 291
 292         /* Configure the termios structure */
 293         cp2101_get_termios(port);
 294
 295         /* Set the DTR and RTS pins low */
 296         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 297
 298         return 0;
 299 }
 300
 301 static void cp2101_cleanup (struct usb_serial_port *port)
 302 {
 303         struct usb_serial *serial = port->serial;
 304
 305         dbg("%s - port %d", __FUNCTION__, port->number);
 306
 307         if (serial->dev) {
 308                 /* shutdown any bulk reads that might be going on */
 309                 if (serial->num_bulk_out)
 310                         usb_kill_urb(port->write_urb);
 311                 if (serial->num_bulk_in)
 312                         usb_kill_urb(port->read_urb);
 313         }
 314 }
 315
 316 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 317 {
 318         dbg("%s - port %d", __FUNCTION__, port->number);
 319
 320         /* shutdown our urbs */
 321         dbg("%s - shutting down urbs", __FUNCTION__);
 322         usb_kill_urb(port->write_urb);
 323         usb_kill_urb(port->read_urb);
 324
 325         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 326 }
 327
 328 /*
 329  * cp2101_get_termios
 330  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 331  * from the device, corrects any unsupported values, and configures the
 332  * termios structure to reflect the state of the device
 333  */
 334 static void cp2101_get_termios (struct usb_serial_port *port)
 335 {
 336         unsigned int cflag, modem_ctl[4];
 337         int baud;
 338         int bits;
 339
 340         dbg("%s - port %d", __FUNCTION__, port->number);
 341
 342         if ((!port->tty) || (!port->tty->termios)) {
 343                 dbg("%s - no tty structures", __FUNCTION__);
 344                 return;
 345         }
 346         cflag = port->tty->termios->c_cflag;
 347
 348         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 349         /* Convert to baudrate */
 350         if (baud)
 351                 baud = BAUD_RATE_GEN_FREQ / baud;
 352
 353         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 354         cflag &= ~CBAUD;
 355         switch (baud) {
 356                 /*
 357                  * The baud rates which are commented out below
 358                  * appear to be supported by the device
 359                  * but are non-standard
 360                  */
 361                 case 600:       cflag |= B600;          break;
 362                 case 1200:      cflag |= B1200;         break;
 363                 case 1800:      cflag |= B1800;         break;
 364                 case 2400:      cflag |= B2400;         break;
 365                 case 4800:      cflag |= B4800;         break;
 366                 /*case 7200:    cflag |= B7200;         break;*/
 367                 case 9600:      cflag |= B9600;         break;
 368                 /*case 14400:   cflag |= B14400;        break;*/
 369                 case 19200:     cflag |= B19200;        break;
 370                 /*case 28800:   cflag |= B28800;        break;*/
 371                 case 38400:     cflag |= B38400;        break;
 372                 /*case 55854:   cflag |= B55054;        break;*/
 373                 case 57600:     cflag |= B57600;        break;
 374                 case 115200:    cflag |= B115200;       break;
 375                 /*case 127117:  cflag |= B127117;       break;*/
 376                 case 230400:    cflag |= B230400;       break;
 377                 case 460800:    cflag |= B460800;       break;
 378                 case 921600:    cflag |= B921600;       break;
 379                 /*case 3686400: cflag |= B3686400;      break;*/
 380                 default:
 381                         dbg("%s - Baud rate is not supported, "
 382                                         "using 9600 baud", __FUNCTION__);
 383                         cflag |= B9600;
 384                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 385                                         (BAUD_RATE_GEN_FREQ/9600));
 386                         break;
 387         }
 388
 389         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 390         cflag &= ~CSIZE;
 391         switch(bits & BITS_DATA_MASK) {
 392                 case BITS_DATA_5:
 393                         dbg("%s - data bits = 5", __FUNCTION__);
 394                         cflag |= CS5;
 395                         break;
 396                 case BITS_DATA_6:
 397                         dbg("%s - data bits = 6", __FUNCTION__);
 398                         cflag |= CS6;
 399                         break;
 400                 case BITS_DATA_7:
 401                         dbg("%s - data bits = 7", __FUNCTION__);
 402                         cflag |= CS7;
 403                         break;
 404                 case BITS_DATA_8:
 405                         dbg("%s - data bits = 8", __FUNCTION__);
 406                         cflag |= CS8;
 407                         break;
 408                 case BITS_DATA_9:
 409                         dbg("%s - data bits = 9 (not supported, "
 410                                         "using 8 data bits)", __FUNCTION__);
 411                         cflag |= CS8;
 412                         bits &= ~BITS_DATA_MASK;
 413                         bits |= BITS_DATA_8;
 414                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 415                         break;
 416                 default:
 417                         dbg("%s - Unknown number of data bits, "
 418                                         "using 8", __FUNCTION__);
 419                         cflag |= CS8;
 420                         bits &= ~BITS_DATA_MASK;
 421                         bits |= BITS_DATA_8;
 422                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 423                         break;
 424         }
 425
 426         switch(bits & BITS_PARITY_MASK) {
 427                 case BITS_PARITY_NONE:
 428                         dbg("%s - parity = NONE", __FUNCTION__);
 429                         cflag &= ~PARENB;
 430                         break;
 431                 case BITS_PARITY_ODD:
 432                         dbg("%s - parity = ODD", __FUNCTION__);
 433                         cflag |= (PARENB|PARODD);
 434                         break;
 435                 case BITS_PARITY_EVEN:
 436                         dbg("%s - parity = EVEN", __FUNCTION__);
 437                         cflag &= ~PARODD;
 438                         cflag |= PARENB;
 439                         break;
 440                 case BITS_PARITY_MARK:
 441                         dbg("%s - parity = MARK (not supported, "
 442                                         "disabling parity)", __FUNCTION__);
 443                         cflag &= ~PARENB;
 444                         bits &= ~BITS_PARITY_MASK;
 445                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 446                         break;
 447                 case BITS_PARITY_SPACE:
 448                         dbg("%s - parity = SPACE (not supported, "
 449                                         "disabling parity)", __FUNCTION__);
 450                         cflag &= ~PARENB;
 451                         bits &= ~BITS_PARITY_MASK;
 452                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 453                         break;
 454                 default:
 455                         dbg("%s - Unknown parity mode, "
 456                                         "disabling parity", __FUNCTION__);
 457                         cflag &= ~PARENB;
 458                         bits &= ~BITS_PARITY_MASK;
 459                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 460                         break;
 461         }
 462
 463         cflag &= ~CSTOPB;
 464         switch(bits & BITS_STOP_MASK) {
 465                 case BITS_STOP_1:
 466                         dbg("%s - stop bits = 1", __FUNCTION__);
 467                         break;
 468                 case BITS_STOP_1_5:
 469                         dbg("%s - stop bits = 1.5 (not supported, "
 470                                         "using 1 stop bit)", __FUNCTION__);
 471                         bits &= ~BITS_STOP_MASK;
 472                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 473                         break;
 474                 case BITS_STOP_2:
 475                         dbg("%s - stop bits = 2", __FUNCTION__);
 476                         cflag |= CSTOPB;
 477                         break;
 478                 default:
 479                         dbg("%s - Unknown number of stop bits, "
 480                                         "using 1 stop bit", __FUNCTION__);
 481                         bits &= ~BITS_STOP_MASK;
 482                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 483                         break;
 484         }
 485
 486         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 487         if (modem_ctl[0] & 0x0008) {
 488                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 489                 cflag |= CRTSCTS;
 490         } else {
 491                 dbg("%s - flow control = NONE", __FUNCTION__);
 492                 cflag &= ~CRTSCTS;
 493         }
 494
 495         port->tty->termios->c_cflag = cflag;
 496 }
 497
 498 static void cp2101_set_termios (struct usb_serial_port *port,
 499                 struct termios *old_termios)
 500 {
 501         unsigned int cflag, old_cflag=0;
 502         int baud=0, bits;
 503         unsigned int modem_ctl[4];
 504
 505         dbg("%s - port %d", __FUNCTION__, port->number);
 506
 507         if ((!port->tty) || (!port->tty->termios)) {
 508                 dbg("%s - no tty structures", __FUNCTION__);
 509                 return;
 510         }
 511         cflag = port->tty->termios->c_cflag;
 512
 513         /* Check that they really want us to change something */
 514         if (old_termios) {
 515                 if ((cflag == old_termios->c_cflag) &&
 516                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 517                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 518                         dbg("%s - nothing to change...", __FUNCTION__);
 519                         return;
 520                 }
 521
 522                 old_cflag = old_termios->c_cflag;
 523         }
 524
 525         /* If the baud rate is to be updated*/
 526         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 527                 switch (cflag & CBAUD) {
 528                         /*
 529                          * The baud rates which are commented out below
 530                          * appear to be supported by the device
 531                          * but are non-standard
 532                          */
 533                         case B0:        baud = 0;       break;
 534                         case B600:      baud = 600;     break;
 535                         case B1200:     baud = 1200;    break;
 536                         case B1800:     baud = 1800;    break;
 537                         case B2400:     baud = 2400;    break;
 538                         case B4800:     baud = 4800;    break;
 539                         /*case B7200:   baud = 7200;    break;*/
 540                         case B9600:     baud = 9600;    break;
 541                         /*ase B14400:   baud = 14400;   break;*/
 542                         case B19200:    baud = 19200;   break;
 543                         /*case B28800:  baud = 28800;   break;*/
 544                         case B38400:    baud = 38400;   break;
 545                         /*case B55854:  baud = 55054;   break;*/
 546                         case B57600:    baud = 57600;   break;
 547                         case B115200:   baud = 115200;  break;
 548                         /*case B127117: baud = 127117;  break;*/
 549                         case B230400:   baud = 230400;  break;
 550                         case B460800:   baud = 460800;  break;
 551                         case B921600:   baud = 921600;  break;
 552                         /*case B3686400:        baud = 3686400; break;*/
 553                         default:
 554                                 dev_err(&port->dev, "cp2101 driver does not "
 555                                         "support the baudrate requested\n");
 556                                 break;
 557                 }
 558
 559                 if (baud) {
 560                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 561                                         baud);
 562                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 563                                                 (BAUD_RATE_GEN_FREQ / baud)))
 564                                 dev_err(&port->dev, "Baud rate requested not "
 565                                                 "supported by device\n");
 566                 }
 567         }
 568
 569         /* If the number of data bits is to be updated */
 570         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 571                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 572                 bits &= ~BITS_DATA_MASK;
 573                 switch (cflag & CSIZE) {
 574                         case CS5:
 575                                 bits |= BITS_DATA_5;
 576                                 dbg("%s - data bits = 5", __FUNCTION__);
 577                                 break;
 578                         case CS6:
 579                                 bits |= BITS_DATA_6;
 580                                 dbg("%s - data bits = 6", __FUNCTION__);
 581                                 break;
 582                         case CS7:
 583                                 bits |= BITS_DATA_7;
 584                                 dbg("%s - data bits = 7", __FUNCTION__);
 585                                 break;
 586                         case CS8:
 587                                 bits |= BITS_DATA_8;
 588                                 dbg("%s - data bits = 8", __FUNCTION__);
 589                                 break;
 590                         /*case CS9:
 591                                 bits |= BITS_DATA_9;
 592                                 dbg("%s - data bits = 9", __FUNCTION__);
 593                                 break;*/
 594                         default:
 595                                 dev_err(&port->dev, "cp2101 driver does not "
 596                                         "support the number of bits requested,"
 597                                         " using 8 bit mode\n");
 598                                 bits |= BITS_DATA_8;
 599                                 break;
 600                 }
 601                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 602                         dev_err(&port->dev, "Number of data bits requested "
 603                                         "not supported by device\n");
 604         }
 605
 606         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 607                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 608                 bits &= ~BITS_PARITY_MASK;
 609                 if (cflag & PARENB) {
 610                         if (cflag & PARODD) {
 611                                 bits |= BITS_PARITY_ODD;
 612                                 dbg("%s - parity = ODD", __FUNCTION__);
 613                         } else {
 614                                 bits |= BITS_PARITY_EVEN;
 615                                 dbg("%s - parity = EVEN", __FUNCTION__);
 616                         }
 617                 }
 618                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 619                         dev_err(&port->dev, "Parity mode not supported "
 620                                         "by device\n");
 621         }
 622
 623         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 624                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 625                 bits &= ~BITS_STOP_MASK;
 626                 if (cflag & CSTOPB) {
 627                         bits |= BITS_STOP_2;
 628                         dbg("%s - stop bits = 2", __FUNCTION__);
 629                 } else {
 630                         bits |= BITS_STOP_1;
 631                         dbg("%s - stop bits = 1", __FUNCTION__);
 632                 }
 633                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 634                         dev_err(&port->dev, "Number of stop bits requested "
 635                                         "not supported by device\n");
 636         }
 637
 638         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 639                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 640                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 641                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 642                                 modem_ctl[2], modem_ctl[3]);
 643
 644                 if (cflag & CRTSCTS) {
 645                         modem_ctl[0] &= ~0x7B;
 646                         modem_ctl[0] |= 0x09;
 647                         modem_ctl[1] = 0x80;
 648                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 649                 } else {
 650                         modem_ctl[0] &= ~0x7B;
 651                         modem_ctl[0] |= 0x01;
 652                         modem_ctl[1] |= 0x40;
 653                         dbg("%s - flow control = NONE", __FUNCTION__);
 654                 }
 655
 656                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 657                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 658                                 modem_ctl[2], modem_ctl[3]);
 659                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 660         }
 661
 662 }
 663
 664 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 665                 unsigned int set, unsigned int clear)
 666 {
 667         int control = 0;
 668
 669         dbg("%s - port %d", __FUNCTION__, port->number);
 670
 671         if (set & TIOCM_RTS) {
 672                 control |= CONTROL_RTS;
 673                 control |= CONTROL_WRITE_RTS;
 674         }
 675         if (set & TIOCM_DTR) {
 676                 control |= CONTROL_DTR;
 677                 control |= CONTROL_WRITE_DTR;
 678         }
 679         if (clear & TIOCM_RTS) {
 680                 control &= ~CONTROL_RTS;
 681                 control |= CONTROL_WRITE_RTS;
 682         }
 683         if (clear & TIOCM_DTR) {
 684                 control &= ~CONTROL_DTR;
 685                 control |= CONTROL_WRITE_DTR;
 686         }
 687
 688         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 689
 690         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 691
 692 }
 693
 694 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 695 {
 696         int control, result;
 697
 698         dbg("%s - port %d", __FUNCTION__, port->number);
 699
 700         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 701
 702         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 703                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 704                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 705                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 706                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 707                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 708
 709         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 710
 711         return result;
 712 }
 713
 714 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 715 {
 716         int state;
 717
 718         dbg("%s - port %d", __FUNCTION__, port->number);
 719         if (break_state == 0)
 720                 state = BREAK_OFF;
 721         else
 722                 state = BREAK_ON;
 723         dbg("%s - turning break %s", __FUNCTION__,
 724                         state==BREAK_OFF ? "off" : "on");
 725         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 726 }
 727
 728 static int cp2101_startup (struct usb_serial *serial)
 729 {
 730         /* CP2101 buffers behave strangely unless device is reset */
 731         usb_reset_device(serial->dev);
 732         return 0;
 733 }
 734
 735 static void cp2101_shutdown (struct usb_serial *serial)
 736 {
 737         int i;
 738
 739         dbg("%s", __FUNCTION__);
 740
 741         /* Stop reads and writes on all ports */
 742         for (i=0; i < serial->num_ports; ++i) {
 743                 cp2101_cleanup(serial->port[i]);
 744         }
 745 }
 746
 747 static int __init cp2101_init (void)
 748 {
 749         int retval;
 750
 751         retval = usb_serial_register(&cp2101_device);
 752         if (retval)
 753                 return retval; /* Failed to register */
 754
 755         retval = usb_register(&cp2101_driver);
 756         if (retval) {
 757                 /* Failed to register */
 758                 usb_serial_deregister(&cp2101_device);
 759                 return retval;
 760         }
 761
 762         /* Success */
 763         info(DRIVER_DESC " " DRIVER_VERSION);
 764         return 0;
 765 }
 766
 767 static void __exit cp2101_exit (void)
 768 {
 769         usb_deregister (&cp2101_driver);
 770         usb_serial_deregister (&cp2101_device);
 771 }
 772
 773 module_init(cp2101_init);
 774 module_exit(cp2101_exit);
 775
 776 MODULE_DESCRIPTION(DRIVER_DESC);
 777 MODULE_VERSION(DRIVER_VERSION);
 778 MODULE_LICENSE("GPL");
 779
 780 module_param(debug, bool, S_IRUGO | S_IWUSR);
 781 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");