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 "v0.04"
  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(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  58         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  59         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  60         { } /* Terminating Entry */
  61 };
  62
  63 MODULE_DEVICE_TABLE (usb, id_table);
  64
  65 static struct usb_driver cp2101_driver = {
  66         .owner          = THIS_MODULE,
  67         .name           = "CP2101",
  68         .probe          = usb_serial_probe,
  69         .disconnect     = usb_serial_disconnect,
  70         .id_table       = id_table,
  71 };
  72
  73 static struct usb_serial_device_type cp2101_device = {
  74         .owner                  = THIS_MODULE,
  75         .name                   = "CP2101",
  76         .id_table               = id_table,
  77         .num_interrupt_in       = 0,
  78         .num_bulk_in            = 0,
  79         .num_bulk_out           = 0,
  80         .num_ports              = 1,
  81         .open                   = cp2101_open,
  82         .close                  = cp2101_close,
  83         .break_ctl              = cp2101_break_ctl,
  84         .set_termios            = cp2101_set_termios,
  85         .tiocmget               = cp2101_tiocmget,
  86         .tiocmset               = cp2101_tiocmset,
  87         .attach                 = cp2101_startup,
  88         .shutdown               = cp2101_shutdown,
  89 };
  90
  91 /* Config request types */
  92 #define REQTYPE_HOST_TO_DEVICE  0x41
  93 #define REQTYPE_DEVICE_TO_HOST  0xc1
  94
  95 /* Config SET requests. To GET, add 1 to the request number */
  96 #define CP2101_UART             0x00    /* Enable / Disable */
  97 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
  98 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
  99 #define CP2101_BREAK            0x05    /* On / Off */
 100 #define CP2101_CONTROL          0x07    /* Flow control line states */
 101 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 102 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 103
 104 /* CP2101_UART */
 105 #define UART_ENABLE             0x0001
 106 #define UART_DISABLE            0x0000
 107
 108 /* CP2101_BAUDRATE */
 109 #define BAUD_RATE_GEN_FREQ      0x384000
 110
 111 /* CP2101_BITS */
 112 #define BITS_DATA_MASK          0X0f00
 113 #define BITS_DATA_5             0X0500
 114 #define BITS_DATA_6             0X0600
 115 #define BITS_DATA_7             0X0700
 116 #define BITS_DATA_8             0X0800
 117 #define BITS_DATA_9             0X0900
 118
 119 #define BITS_PARITY_MASK        0x00f0
 120 #define BITS_PARITY_NONE        0x0000
 121 #define BITS_PARITY_ODD         0x0010
 122 #define BITS_PARITY_EVEN        0x0020
 123 #define BITS_PARITY_MARK        0x0030
 124 #define BITS_PARITY_SPACE       0x0040
 125
 126 #define BITS_STOP_MASK          0x000f
 127 #define BITS_STOP_1             0x0000
 128 #define BITS_STOP_1_5           0x0001
 129 #define BITS_STOP_2             0x0002
 130
 131 /* CP2101_BREAK */
 132 #define BREAK_ON                0x0000
 133 #define BREAK_OFF               0x0001
 134
 135 /* CP2101_CONTROL */
 136 #define CONTROL_DTR             0x0001
 137 #define CONTROL_RTS             0x0002
 138 #define CONTROL_CTS             0x0010
 139 #define CONTROL_DSR             0x0020
 140 #define CONTROL_RING            0x0040
 141 #define CONTROL_DCD             0x0080
 142 #define CONTROL_WRITE_DTR       0x0100
 143 #define CONTROL_WRITE_RTS       0x0200
 144
 145 /*
 146  * cp2101_get_config
 147  * Reads from the CP2101 configuration registers
 148  * 'size' is specified in bytes.
 149  * 'data' is a pointer to a pre-allocated array of integers large
 150  * enough to hold 'size' bytes (with 4 bytes to each integer)
 151  */
 152 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 153                 unsigned int *data, int size)
 154 {
 155         struct usb_serial *serial = port->serial;
 156         u32 *buf;
 157         int result, i, length;
 158
 159         /* Number of integers required to contain the array */
 160         length = (((size - 1) | 3) + 1)/4;
 161
 162         buf = kmalloc (length * sizeof(u32), GFP_KERNEL);
 163         memset(buf, 0, length * sizeof(u32));
 164
 165         if (!buf) {
 166                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 167                 return -ENOMEM;
 168         }
 169
 170         /* For get requests, the request number must be incremented */
 171         request++;
 172
 173         /* Issue the request, attempting to read 'size' bytes */
 174         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 175                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 176                                 0, buf, size, 300);
 177
 178         /* Convert data into an array of integers */
 179         for (i=0; i<length; i++)
 180                 data[i] = le32_to_cpu(buf[i]);
 181
 182         kfree(buf);
 183
 184         if (result != size) {
 185                 dev_err(&port->dev, "%s - Unable to send config request, "
 186                                 "request=0x%x size=%d result=%d\n",
 187                                 __FUNCTION__, request, size, result);
 188                 return -EPROTO;
 189         }
 190
 191         return 0;
 192 }
 193
 194 /*
 195  * cp2101_set_config
 196  * Writes to the CP2101 configuration registers
 197  * Values less than 16 bits wide are sent directly
 198  * 'size' is specified in bytes.
 199  */
 200 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 201                 unsigned int *data, int size)
 202 {
 203         struct usb_serial *serial = port->serial;
 204         u32 *buf;
 205         int result, i, length;
 206
 207         /* Number of integers required to contain the array */
 208         length = (((size - 1) | 3) + 1)/4;
 209
 210         buf = kmalloc(length * sizeof(u32), GFP_KERNEL);
 211         if (!buf) {
 212                 dev_err(&port->dev, "%s - out of memory.\n",
 213                                 __FUNCTION__);
 214                 return -ENOMEM;
 215         }
 216
 217         /* Array of integers into bytes */
 218         for (i = 0; i < length; i++)
 219                 buf[i] = cpu_to_le32(data[i]);
 220
 221         if (size > 2) {
 222                 result = usb_control_msg (serial->dev,
 223                                 usb_sndctrlpipe(serial->dev, 0),
 224                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 225                                 0, buf, size, 300);
 226         } else {
 227                 result = usb_control_msg (serial->dev,
 228                                 usb_sndctrlpipe(serial->dev, 0),
 229                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 230                                 0, NULL, 0, 300);
 231         }
 232
 233         kfree(buf);
 234
 235         if ((size > 2 && result != size) || result < 0) {
 236                 dev_err(&port->dev, "%s - Unable to send request, "
 237                                 "request=0x%x size=%d result=%d\n",
 238                                 __FUNCTION__, request, size, result);
 239                 return -EPROTO;
 240         }
 241
 242         /* Single data value */
 243         result = usb_control_msg (serial->dev,
 244                         usb_sndctrlpipe(serial->dev, 0),
 245                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 246                         0, NULL, 0, 300);
 247         return 0;
 248 }
 249
 250 /*
 251  * cp2101_set_config_single
 252  * Convenience function for calling cp2101_set_config on single data values
 253  * without requiring an integer pointer
 254  */
 255 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 256                 u8 request, unsigned int data)
 257 {
 258         return cp2101_set_config(port, request, &data, 2);
 259 }
 260
 261 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 262 {
 263         struct usb_serial *serial = port->serial;
 264         int result;
 265
 266         dbg("%s - port %d", __FUNCTION__, port->number);
 267
 268         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 269                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 270                                 __FUNCTION__);
 271                 return -EPROTO;
 272         }
 273
 274         /* Start reading from the device */
 275         usb_fill_bulk_urb (port->read_urb, serial->dev,
 276                         usb_rcvbulkpipe(serial->dev,
 277                         port->bulk_in_endpointAddress),
 278                         port->read_urb->transfer_buffer,
 279                         port->read_urb->transfer_buffer_length,
 280                         serial->type->read_bulk_callback,
 281                         port);
 282         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 283         if (result) {
 284                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 285                                 "error %d\n", __FUNCTION__, result);
 286                 return result;
 287         }
 288
 289         /* Configure the termios structure */
 290         cp2101_get_termios(port);
 291
 292         /* Set the DTR and RTS pins low */
 293         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 294
 295         return 0;
 296 }
 297
 298 static void cp2101_cleanup (struct usb_serial_port *port)
 299 {
 300         struct usb_serial *serial = port->serial;
 301
 302         dbg("%s - port %d", __FUNCTION__, port->number);
 303
 304         if (serial->dev) {
 305                 /* shutdown any bulk reads that might be going on */
 306                 if (serial->num_bulk_out)
 307                         usb_kill_urb(port->write_urb);
 308                 if (serial->num_bulk_in)
 309                         usb_kill_urb(port->read_urb);
 310         }
 311 }
 312
 313 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 314 {
 315         dbg("%s - port %d", __FUNCTION__, port->number);
 316
 317         /* shutdown our urbs */
 318         dbg("%s - shutting down urbs", __FUNCTION__);
 319         usb_kill_urb(port->write_urb);
 320         usb_kill_urb(port->read_urb);
 321
 322         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 323 }
 324
 325 /*
 326  * cp2101_get_termios
 327  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 328  * from the device, corrects any unsupported values, and configures the
 329  * termios structure to reflect the state of the device
 330  */
 331 static void cp2101_get_termios (struct usb_serial_port *port)
 332 {
 333         unsigned int cflag, modem_ctl[4];
 334         int baud;
 335         int bits;
 336
 337         dbg("%s - port %d", __FUNCTION__, port->number);
 338
 339         if ((!port->tty) || (!port->tty->termios)) {
 340                 dbg("%s - no tty structures", __FUNCTION__);
 341                 return;
 342         }
 343         cflag = port->tty->termios->c_cflag;
 344
 345         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 346         /* Convert to baudrate */
 347         if (baud)
 348                 baud = BAUD_RATE_GEN_FREQ / baud;
 349
 350         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 351         cflag &= ~CBAUD;
 352         switch (baud) {
 353                 /*
 354                  * The baud rates which are commented out below
 355                  * appear to be supported by the device
 356                  * but are non-standard
 357                  */
 358                 case 600:       cflag |= B600;          break;
 359                 case 1200:      cflag |= B1200;         break;
 360                 case 1800:      cflag |= B1800;         break;
 361                 case 2400:      cflag |= B2400;         break;
 362                 case 4800:      cflag |= B4800;         break;
 363                 /*case 7200:    cflag |= B7200;         break;*/
 364                 case 9600:      cflag |= B9600;         break;
 365                 /*case 14400:   cflag |= B14400;        break;*/
 366                 case 19200:     cflag |= B19200;        break;
 367                 /*case 28800:   cflag |= B28800;        break;*/
 368                 case 38400:     cflag |= B38400;        break;
 369                 /*case 55854:   cflag |= B55054;        break;*/
 370                 case 57600:     cflag |= B57600;        break;
 371                 case 115200:    cflag |= B115200;       break;
 372                 /*case 127117:  cflag |= B127117;       break;*/
 373                 case 230400:    cflag |= B230400;       break;
 374                 case 460800:    cflag |= B460800;       break;
 375                 case 921600:    cflag |= B921600;       break;
 376                 /*case 3686400: cflag |= B3686400;      break;*/
 377                 default:
 378                         dbg("%s - Baud rate is not supported, "
 379                                         "using 9600 baud", __FUNCTION__);
 380                         cflag |= B9600;
 381                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 382                                         (BAUD_RATE_GEN_FREQ/9600));
 383                         break;
 384         }
 385
 386         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 387         cflag &= ~CSIZE;
 388         switch(bits & BITS_DATA_MASK) {
 389                 case BITS_DATA_5:
 390                         dbg("%s - data bits = 5", __FUNCTION__);
 391                         cflag |= CS5;
 392                         break;
 393                 case BITS_DATA_6:
 394                         dbg("%s - data bits = 6", __FUNCTION__);
 395                         cflag |= CS6;
 396                         break;
 397                 case BITS_DATA_7:
 398                         dbg("%s - data bits = 7", __FUNCTION__);
 399                         cflag |= CS7;
 400                         break;
 401                 case BITS_DATA_8:
 402                         dbg("%s - data bits = 8", __FUNCTION__);
 403                         cflag |= CS8;
 404                         break;
 405                 case BITS_DATA_9:
 406                         dbg("%s - data bits = 9 (not supported, "
 407                                         "using 8 data bits)", __FUNCTION__);
 408                         cflag |= CS8;
 409                         bits &= ~BITS_DATA_MASK;
 410                         bits |= BITS_DATA_8;
 411                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 412                         break;
 413                 default:
 414                         dbg("%s - Unknown number of data bits, "
 415                                         "using 8", __FUNCTION__);
 416                         cflag |= CS8;
 417                         bits &= ~BITS_DATA_MASK;
 418                         bits |= BITS_DATA_8;
 419                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 420                         break;
 421         }
 422
 423         switch(bits & BITS_PARITY_MASK) {
 424                 case BITS_PARITY_NONE:
 425                         dbg("%s - parity = NONE", __FUNCTION__);
 426                         cflag &= ~PARENB;
 427                         break;
 428                 case BITS_PARITY_ODD:
 429                         dbg("%s - parity = ODD", __FUNCTION__);
 430                         cflag |= (PARENB|PARODD);
 431                         break;
 432                 case BITS_PARITY_EVEN:
 433                         dbg("%s - parity = EVEN", __FUNCTION__);
 434                         cflag &= ~PARODD;
 435                         cflag |= PARENB;
 436                         break;
 437                 case BITS_PARITY_MARK:
 438                         dbg("%s - parity = MARK (not supported, "
 439                                         "disabling parity)", __FUNCTION__);
 440                         cflag &= ~PARENB;
 441                         bits &= ~BITS_PARITY_MASK;
 442                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 443                         break;
 444                 case BITS_PARITY_SPACE:
 445                         dbg("%s - parity = SPACE (not supported, "
 446                                         "disabling parity)", __FUNCTION__);
 447                         cflag &= ~PARENB;
 448                         bits &= ~BITS_PARITY_MASK;
 449                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 450                         break;
 451                 default:
 452                         dbg("%s - Unknown parity mode, "
 453                                         "disabling parity", __FUNCTION__);
 454                         cflag &= ~PARENB;
 455                         bits &= ~BITS_PARITY_MASK;
 456                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 457                         break;
 458         }
 459
 460         cflag &= ~CSTOPB;
 461         switch(bits & BITS_STOP_MASK) {
 462                 case BITS_STOP_1:
 463                         dbg("%s - stop bits = 1", __FUNCTION__);
 464                         break;
 465                 case BITS_STOP_1_5:
 466                         dbg("%s - stop bits = 1.5 (not supported, "
 467                                         "using 1 stop bit)", __FUNCTION__);
 468                         bits &= ~BITS_STOP_MASK;
 469                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 470                         break;
 471                 case BITS_STOP_2:
 472                         dbg("%s - stop bits = 2", __FUNCTION__);
 473                         cflag |= CSTOPB;
 474                         break;
 475                 default:
 476                         dbg("%s - Unknown number of stop bits, "
 477                                         "using 1 stop bit", __FUNCTION__);
 478                         bits &= ~BITS_STOP_MASK;
 479                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 480                         break;
 481         }
 482
 483         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 484         if (modem_ctl[0] & 0x0008) {
 485                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 486                 cflag |= CRTSCTS;
 487         } else {
 488                 dbg("%s - flow control = NONE", __FUNCTION__);
 489                 cflag &= ~CRTSCTS;
 490         }
 491
 492         port->tty->termios->c_cflag = cflag;
 493 }
 494
 495 static void cp2101_set_termios (struct usb_serial_port *port,
 496                 struct termios *old_termios)
 497 {
 498         unsigned int cflag, old_cflag=0;
 499         int baud=0, bits;
 500         unsigned int modem_ctl[4];
 501
 502         dbg("%s - port %d", __FUNCTION__, port->number);
 503
 504         if ((!port->tty) || (!port->tty->termios)) {
 505                 dbg("%s - no tty structures", __FUNCTION__);
 506                 return;
 507         }
 508         cflag = port->tty->termios->c_cflag;
 509
 510         /* Check that they really want us to change something */
 511         if (old_termios) {
 512                 if ((cflag == old_termios->c_cflag) &&
 513                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 514                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 515                         dbg("%s - nothing to change...", __FUNCTION__);
 516                         return;
 517                 }
 518
 519                 old_cflag = old_termios->c_cflag;
 520         }
 521
 522         /* If the baud rate is to be updated*/
 523         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 524                 switch (cflag & CBAUD) {
 525                         /*
 526                          * The baud rates which are commented out below
 527                          * appear to be supported by the device
 528                          * but are non-standard
 529                          */
 530                         case B0:        baud = 0;       break;
 531                         case B600:      baud = 600;     break;
 532                         case B1200:     baud = 1200;    break;
 533                         case B1800:     baud = 1800;    break;
 534                         case B2400:     baud = 2400;    break;
 535                         case B4800:     baud = 4800;    break;
 536                         /*case B7200:   baud = 7200;    break;*/
 537                         case B9600:     baud = 9600;    break;
 538                         /*ase B14400:   baud = 14400;   break;*/
 539                         case B19200:    baud = 19200;   break;
 540                         /*case B28800:  baud = 28800;   break;*/
 541                         case B38400:    baud = 38400;   break;
 542                         /*case B55854:  baud = 55054;   break;*/
 543                         case B57600:    baud = 57600;   break;
 544                         case B115200:   baud = 115200;  break;
 545                         /*case B127117: baud = 127117;  break;*/
 546                         case B230400:   baud = 230400;  break;
 547                         case B460800:   baud = 460800;  break;
 548                         case B921600:   baud = 921600;  break;
 549                         /*case B3686400:        baud = 3686400; break;*/
 550                         default:
 551                                 dev_err(&port->dev, "cp2101 driver does not "
 552                                         "support the baudrate requested\n");
 553                                 break;
 554                 }
 555
 556                 if (baud) {
 557                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 558                                         baud);
 559                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 560                                                 (BAUD_RATE_GEN_FREQ / baud)))
 561                                 dev_err(&port->dev, "Baud rate requested not "
 562                                                 "supported by device\n");
 563                 }
 564         }
 565
 566         /* If the number of data bits is to be updated */
 567         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 568                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 569                 bits &= ~BITS_DATA_MASK;
 570                 switch (cflag & CSIZE) {
 571                         case CS5:
 572                                 bits |= BITS_DATA_5;
 573                                 dbg("%s - data bits = 5", __FUNCTION__);
 574                                 break;
 575                         case CS6:
 576                                 bits |= BITS_DATA_6;
 577                                 dbg("%s - data bits = 6", __FUNCTION__);
 578                                 break;
 579                         case CS7:
 580                                 bits |= BITS_DATA_7;
 581                                 dbg("%s - data bits = 7", __FUNCTION__);
 582                                 break;
 583                         case CS8:
 584                                 bits |= BITS_DATA_8;
 585                                 dbg("%s - data bits = 8", __FUNCTION__);
 586                                 break;
 587                         /*case CS9:
 588                                 bits |= BITS_DATA_9;
 589                                 dbg("%s - data bits = 9", __FUNCTION__);
 590                                 break;*/
 591                         default:
 592                                 dev_err(&port->dev, "cp2101 driver does not "
 593                                         "support the number of bits requested,"
 594                                         " using 8 bit mode\n");
 595                                 bits |= BITS_DATA_8;
 596                                 break;
 597                 }
 598                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 599                         dev_err(&port->dev, "Number of data bits requested "
 600                                         "not supported by device\n");
 601         }
 602
 603         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 604                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 605                 bits &= ~BITS_PARITY_MASK;
 606                 if (cflag & PARENB) {
 607                         if (cflag & PARODD) {
 608                                 bits |= BITS_PARITY_ODD;
 609                                 dbg("%s - parity = ODD", __FUNCTION__);
 610                         } else {
 611                                 bits |= BITS_PARITY_EVEN;
 612                                 dbg("%s - parity = EVEN", __FUNCTION__);
 613                         }
 614                 }
 615                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 616                         dev_err(&port->dev, "Parity mode not supported "
 617                                         "by device\n");
 618         }
 619
 620         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 621                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 622                 bits &= ~BITS_STOP_MASK;
 623                 if (cflag & CSTOPB) {
 624                         bits |= BITS_STOP_2;
 625                         dbg("%s - stop bits = 2", __FUNCTION__);
 626                 } else {
 627                         bits |= BITS_STOP_1;
 628                         dbg("%s - stop bits = 1", __FUNCTION__);
 629                 }
 630                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 631                         dev_err(&port->dev, "Number of stop bits requested "
 632                                         "not supported by device\n");
 633         }
 634
 635         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 636                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 637                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 638                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 639                                 modem_ctl[2], modem_ctl[3]);
 640
 641                 if (cflag & CRTSCTS) {
 642                         modem_ctl[0] &= ~0x7B;
 643                         modem_ctl[0] |= 0x09;
 644                         modem_ctl[1] = 0x80;
 645                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 646                 } else {
 647                         modem_ctl[0] &= ~0x7B;
 648                         modem_ctl[0] |= 0x01;
 649                         modem_ctl[1] |= 0x40;
 650                         dbg("%s - flow control = NONE", __FUNCTION__);
 651                 }
 652
 653                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 654                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 655                                 modem_ctl[2], modem_ctl[3]);
 656                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 657         }
 658
 659 }
 660
 661 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 662                 unsigned int set, unsigned int clear)
 663 {
 664         int control = 0;
 665
 666         dbg("%s - port %d", __FUNCTION__, port->number);
 667
 668         if (set & TIOCM_RTS) {
 669                 control |= CONTROL_RTS;
 670                 control |= CONTROL_WRITE_RTS;
 671         }
 672         if (set & TIOCM_DTR) {
 673                 control |= CONTROL_DTR;
 674                 control |= CONTROL_WRITE_DTR;
 675         }
 676         if (clear & TIOCM_RTS) {
 677                 control &= ~CONTROL_RTS;
 678                 control |= CONTROL_WRITE_RTS;
 679         }
 680         if (clear & TIOCM_DTR) {
 681                 control &= ~CONTROL_DTR;
 682                 control |= CONTROL_WRITE_DTR;
 683         }
 684
 685         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 686
 687         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 688
 689 }
 690
 691 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 692 {
 693         int control, result;
 694
 695         dbg("%s - port %d", __FUNCTION__, port->number);
 696
 697         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 698
 699         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 700                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 701                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 702                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 703                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 704                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 705
 706         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 707
 708         return result;
 709 }
 710
 711 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 712 {
 713         int state;
 714
 715         dbg("%s - port %d", __FUNCTION__, port->number);
 716         if (break_state == 0)
 717                 state = BREAK_OFF;
 718         else
 719                 state = BREAK_ON;
 720         dbg("%s - turning break %s", __FUNCTION__,
 721                         state==BREAK_OFF ? "off" : "on");
 722         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 723 }
 724
 725 static int cp2101_startup (struct usb_serial *serial)
 726 {
 727         /* CP2101 buffers behave strangely unless device is reset */
 728         usb_reset_device(serial->dev);
 729         return 0;
 730 }
 731
 732 static void cp2101_shutdown (struct usb_serial *serial)
 733 {
 734         int i;
 735
 736         dbg("%s", __FUNCTION__);
 737
 738         /* Stop reads and writes on all ports */
 739         for (i=0; i < serial->num_ports; ++i) {
 740                 cp2101_cleanup(serial->port[i]);
 741         }
 742 }
 743
 744 static int __init cp2101_init (void)
 745 {
 746         int retval;
 747
 748         retval = usb_serial_register(&cp2101_device);
 749         if (retval)
 750                 return retval; /* Failed to register */
 751
 752         retval = usb_register(&cp2101_driver);
 753         if (retval) {
 754                 /* Failed to register */
 755                 usb_serial_deregister(&cp2101_device);
 756                 return retval;
 757         }
 758
 759         /* Success */
 760         info(DRIVER_DESC " " DRIVER_VERSION);
 761         return 0;
 762 }
 763
 764 static void __exit cp2101_exit (void)
 765 {
 766         usb_deregister (&cp2101_driver);
 767         usb_serial_deregister (&cp2101_device);
 768 }
 769
 770 module_init(cp2101_init);
 771 module_exit(cp2101_exit);
 772
 773 MODULE_DESCRIPTION(DRIVER_DESC);
 774 MODULE_VERSION(DRIVER_VERSION);
 775 MODULE_LICENSE("GPL");
 776
 777 module_param(debug, bool, S_IRUGO | S_IWUSR);
 778 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");