drivers/usb/serial/cp2101.c

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