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 <linux/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 tty_struct *, struct usb_serial_port *,
  41                                                         struct file *);
  42 static void cp2101_cleanup(struct usb_serial_port *);
  43 static void cp2101_close(struct tty_struct *, struct usb_serial_port *,
  44                                                         struct file*);
  45 static void cp2101_get_termios(struct tty_struct *);
  46 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
  47                                                         struct ktermios*);
  48 static int cp2101_tiocmget(struct tty_struct *, struct file *);
  49 static int cp2101_tiocmset(struct tty_struct *, struct file *,
  50                 unsigned int, unsigned int);
  51 static void cp2101_break_ctl(struct tty_struct *, int);
  52 static int cp2101_startup(struct usb_serial *);
  53 static void cp2101_shutdown(struct usb_serial *);
  54
  55
  56 static int debug;
  57
  58 static struct usb_device_id id_table [] = {
  59         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  60         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  61         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  62         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  63         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  65         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  66         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  67         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  68         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  69         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  70         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  71         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  72         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  73         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  74         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  75         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  76         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  77         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  78         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  79         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  80         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  81         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  82         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  83         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  84         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  85         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  86         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  87         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  88         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  89         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  90         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  91         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
  92         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  93         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  94         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
  95         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  96         { } /* Terminating Entry */
  97 };
  98
  99 MODULE_DEVICE_TABLE(usb, id_table);
 100
 101 static struct usb_driver cp2101_driver = {
 102         .name           = "cp2101",
 103         .probe          = usb_serial_probe,
 104         .disconnect     = usb_serial_disconnect,
 105         .id_table       = id_table,
 106         .no_dynamic_id  =       1,
 107 };
 108
 109 static struct usb_serial_driver cp2101_device = {
 110         .driver = {
 111                 .owner =        THIS_MODULE,
 112                 .name =         "cp2101",
 113         },
 114         .usb_driver             = &cp2101_driver,
 115         .id_table               = id_table,
 116         .num_ports              = 1,
 117         .open                   = cp2101_open,
 118         .close                  = cp2101_close,
 119         .break_ctl              = cp2101_break_ctl,
 120         .set_termios            = cp2101_set_termios,
 121         .tiocmget               = cp2101_tiocmget,
 122         .tiocmset               = cp2101_tiocmset,
 123         .attach                 = cp2101_startup,
 124         .shutdown               = cp2101_shutdown,
 125 };
 126
 127 /* Config request types */
 128 #define REQTYPE_HOST_TO_DEVICE  0x41
 129 #define REQTYPE_DEVICE_TO_HOST  0xc1
 130
 131 /* Config SET requests. To GET, add 1 to the request number */
 132 #define CP2101_UART             0x00    /* Enable / Disable */
 133 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 134 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 135 #define CP2101_BREAK            0x05    /* On / Off */
 136 #define CP2101_CONTROL          0x07    /* Flow control line states */
 137 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 138 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 139
 140 /* CP2101_UART */
 141 #define UART_ENABLE             0x0001
 142 #define UART_DISABLE            0x0000
 143
 144 /* CP2101_BAUDRATE */
 145 #define BAUD_RATE_GEN_FREQ      0x384000
 146
 147 /* CP2101_BITS */
 148 #define BITS_DATA_MASK          0X0f00
 149 #define BITS_DATA_5             0X0500
 150 #define BITS_DATA_6             0X0600
 151 #define BITS_DATA_7             0X0700
 152 #define BITS_DATA_8             0X0800
 153 #define BITS_DATA_9             0X0900
 154
 155 #define BITS_PARITY_MASK        0x00f0
 156 #define BITS_PARITY_NONE        0x0000
 157 #define BITS_PARITY_ODD         0x0010
 158 #define BITS_PARITY_EVEN        0x0020
 159 #define BITS_PARITY_MARK        0x0030
 160 #define BITS_PARITY_SPACE       0x0040
 161
 162 #define BITS_STOP_MASK          0x000f
 163 #define BITS_STOP_1             0x0000
 164 #define BITS_STOP_1_5           0x0001
 165 #define BITS_STOP_2             0x0002
 166
 167 /* CP2101_BREAK */
 168 #define BREAK_ON                0x0000
 169 #define BREAK_OFF               0x0001
 170
 171 /* CP2101_CONTROL */
 172 #define CONTROL_DTR             0x0001
 173 #define CONTROL_RTS             0x0002
 174 #define CONTROL_CTS             0x0010
 175 #define CONTROL_DSR             0x0020
 176 #define CONTROL_RING            0x0040
 177 #define CONTROL_DCD             0x0080
 178 #define CONTROL_WRITE_DTR       0x0100
 179 #define CONTROL_WRITE_RTS       0x0200
 180
 181 /*
 182  * cp2101_get_config
 183  * Reads from the CP2101 configuration registers
 184  * 'size' is specified in bytes.
 185  * 'data' is a pointer to a pre-allocated array of integers large
 186  * enough to hold 'size' bytes (with 4 bytes to each integer)
 187  */
 188 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
 189                 unsigned int *data, int size)
 190 {
 191         struct usb_serial *serial = port->serial;
 192         __le32 *buf;
 193         int result, i, length;
 194
 195         /* Number of integers required to contain the array */
 196         length = (((size - 1) | 3) + 1)/4;
 197
 198         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 199         if (!buf) {
 200                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 201                 return -ENOMEM;
 202         }
 203
 204         /* For get requests, the request number must be incremented */
 205         request++;
 206
 207         /* Issue the request, attempting to read 'size' bytes */
 208         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 209                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 210                                 0, buf, size, 300);
 211
 212         /* Convert data into an array of integers */
 213         for (i = 0; i < length; i++)
 214                 data[i] = le32_to_cpu(buf[i]);
 215
 216         kfree(buf);
 217
 218         if (result != size) {
 219                 dev_err(&port->dev, "%s - Unable to send config request, "
 220                                 "request=0x%x size=%d result=%d\n",
 221                                 __func__, request, size, result);
 222                 return -EPROTO;
 223         }
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * cp2101_set_config
 230  * Writes to the CP2101 configuration registers
 231  * Values less than 16 bits wide are sent directly
 232  * 'size' is specified in bytes.
 233  */
 234 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
 235                 unsigned int *data, int size)
 236 {
 237         struct usb_serial *serial = port->serial;
 238         __le32 *buf;
 239         int result, i, length;
 240
 241         /* Number of integers required to contain the array */
 242         length = (((size - 1) | 3) + 1)/4;
 243
 244         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 245         if (!buf) {
 246                 dev_err(&port->dev, "%s - out of memory.\n",
 247                                 __func__);
 248                 return -ENOMEM;
 249         }
 250
 251         /* Array of integers into bytes */
 252         for (i = 0; i < length; i++)
 253                 buf[i] = cpu_to_le32(data[i]);
 254
 255         if (size > 2) {
 256                 result = usb_control_msg(serial->dev,
 257                                 usb_sndctrlpipe(serial->dev, 0),
 258                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 259                                 0, buf, size, 300);
 260         } else {
 261                 result = usb_control_msg(serial->dev,
 262                                 usb_sndctrlpipe(serial->dev, 0),
 263                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 264                                 0, NULL, 0, 300);
 265         }
 266
 267         kfree(buf);
 268
 269         if ((size > 2 && result != size) || result < 0) {
 270                 dev_err(&port->dev, "%s - Unable to send request, "
 271                                 "request=0x%x size=%d result=%d\n",
 272                                 __func__, request, size, result);
 273                 return -EPROTO;
 274         }
 275
 276         /* Single data value */
 277         result = usb_control_msg(serial->dev,
 278                         usb_sndctrlpipe(serial->dev, 0),
 279                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 280                         0, NULL, 0, 300);
 281         return 0;
 282 }
 283
 284 /*
 285  * cp2101_set_config_single
 286  * Convenience function for calling cp2101_set_config on single data values
 287  * without requiring an integer pointer
 288  */
 289 static inline int cp2101_set_config_single(struct usb_serial_port *port,
 290                 u8 request, unsigned int data)
 291 {
 292         return cp2101_set_config(port, request, &data, 2);
 293 }
 294
 295 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
 296                                 struct file *filp)
 297 {
 298         struct usb_serial *serial = port->serial;
 299         int result;
 300
 301         dbg("%s - port %d", __func__, port->number);
 302
 303         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 304                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 305                                 __func__);
 306                 return -EPROTO;
 307         }
 308
 309         /* Start reading from the device */
 310         usb_fill_bulk_urb(port->read_urb, serial->dev,
 311                         usb_rcvbulkpipe(serial->dev,
 312                         port->bulk_in_endpointAddress),
 313                         port->read_urb->transfer_buffer,
 314                         port->read_urb->transfer_buffer_length,
 315                         serial->type->read_bulk_callback,
 316                         port);
 317         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 318         if (result) {
 319                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 320                                 "error %d\n", __func__, result);
 321                 return result;
 322         }
 323
 324         /* Configure the termios structure */
 325         cp2101_get_termios(tty);
 326
 327         /* Set the DTR and RTS pins low */
 328         cp2101_tiocmset(tty, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 329
 330         return 0;
 331 }
 332
 333 static void cp2101_cleanup(struct usb_serial_port *port)
 334 {
 335         struct usb_serial *serial = port->serial;
 336
 337         dbg("%s - port %d", __func__, port->number);
 338
 339         if (serial->dev) {
 340                 /* shutdown any bulk reads that might be going on */
 341                 if (serial->num_bulk_out)
 342                         usb_kill_urb(port->write_urb);
 343                 if (serial->num_bulk_in)
 344                         usb_kill_urb(port->read_urb);
 345         }
 346 }
 347
 348 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
 349                                         struct file *filp)
 350 {
 351         dbg("%s - port %d", __func__, port->number);
 352
 353         /* shutdown our urbs */
 354         dbg("%s - shutting down urbs", __func__);
 355         usb_kill_urb(port->write_urb);
 356         usb_kill_urb(port->read_urb);
 357
 358         mutex_lock(&port->serial->disc_mutex);
 359         if (!port->serial->disconnected)
 360                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 361         mutex_unlock(&port->serial->disc_mutex);
 362 }
 363
 364 /*
 365  * cp2101_get_termios
 366  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 367  * from the device, corrects any unsupported values, and configures the
 368  * termios structure to reflect the state of the device
 369  */
 370 static void cp2101_get_termios (struct tty_struct *tty)
 371 {
 372         struct usb_serial_port *port = tty->driver_data;
 373         unsigned int cflag, modem_ctl[4];
 374         unsigned int baud;
 375         unsigned int bits;
 376
 377         dbg("%s - port %d", __func__, port->number);
 378
 379         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 380         /* Convert to baudrate */
 381         if (baud)
 382                 baud = BAUD_RATE_GEN_FREQ / baud;
 383
 384         dbg("%s - baud rate = %d", __func__, baud);
 385
 386         tty_encode_baud_rate(tty, baud, baud);
 387         cflag = tty->termios->c_cflag;
 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", __func__);
 394                 cflag |= CS5;
 395                 break;
 396         case BITS_DATA_6:
 397                 dbg("%s - data bits = 6", __func__);
 398                 cflag |= CS6;
 399                 break;
 400         case BITS_DATA_7:
 401                 dbg("%s - data bits = 7", __func__);
 402                 cflag |= CS7;
 403                 break;
 404         case BITS_DATA_8:
 405                 dbg("%s - data bits = 8", __func__);
 406                 cflag |= CS8;
 407                 break;
 408         case BITS_DATA_9:
 409                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 410                                                                 __func__);
 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, using 8", __func__);
 418                 cflag |= CS8;
 419                 bits &= ~BITS_DATA_MASK;
 420                 bits |= BITS_DATA_8;
 421                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 422                 break;
 423         }
 424
 425         switch (bits & BITS_PARITY_MASK) {
 426         case BITS_PARITY_NONE:
 427                 dbg("%s - parity = NONE", __func__);
 428                 cflag &= ~PARENB;
 429                 break;
 430         case BITS_PARITY_ODD:
 431                 dbg("%s - parity = ODD", __func__);
 432                 cflag |= (PARENB|PARODD);
 433                 break;
 434         case BITS_PARITY_EVEN:
 435                 dbg("%s - parity = EVEN", __func__);
 436                 cflag &= ~PARODD;
 437                 cflag |= PARENB;
 438                 break;
 439         case BITS_PARITY_MARK:
 440                 dbg("%s - parity = MARK (not supported, disabling parity)",
 441                                 __func__);
 442                 cflag &= ~PARENB;
 443                 bits &= ~BITS_PARITY_MASK;
 444                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 445                 break;
 446         case BITS_PARITY_SPACE:
 447                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 448                                 __func__);
 449                 cflag &= ~PARENB;
 450                 bits &= ~BITS_PARITY_MASK;
 451                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 452                 break;
 453         default:
 454                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 455                 cflag &= ~PARENB;
 456                 bits &= ~BITS_PARITY_MASK;
 457                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 458                 break;
 459         }
 460
 461         cflag &= ~CSTOPB;
 462         switch (bits & BITS_STOP_MASK) {
 463         case BITS_STOP_1:
 464                 dbg("%s - stop bits = 1", __func__);
 465                 break;
 466         case BITS_STOP_1_5:
 467                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 468                                                                 __func__);
 469                 bits &= ~BITS_STOP_MASK;
 470                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 471                 break;
 472         case BITS_STOP_2:
 473                 dbg("%s - stop bits = 2", __func__);
 474                 cflag |= CSTOPB;
 475                 break;
 476         default:
 477                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 478                                                                 __func__);
 479                 bits &= ~BITS_STOP_MASK;
 480                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 481                 break;
 482         }
 483
 484         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 485         if (modem_ctl[0] & 0x0008) {
 486                 dbg("%s - flow control = CRTSCTS", __func__);
 487                 cflag |= CRTSCTS;
 488         } else {
 489                 dbg("%s - flow control = NONE", __func__);
 490                 cflag &= ~CRTSCTS;
 491         }
 492
 493         tty->termios->c_cflag = cflag;
 494 }
 495
 496 static void cp2101_set_termios(struct tty_struct *tty,
 497                 struct usb_serial_port *port, struct ktermios *old_termios)
 498 {
 499         unsigned int cflag, old_cflag;
 500         unsigned int baud = 0, bits;
 501         unsigned int modem_ctl[4];
 502
 503         dbg("%s - port %d", __func__, port->number);
 504
 505         if (!tty)
 506                 return;
 507
 508         tty->termios->c_cflag &= ~CMSPAR;
 509         cflag = tty->termios->c_cflag;
 510         old_cflag = old_termios->c_cflag;
 511         baud = tty_get_baud_rate(tty);
 512
 513         /* If the baud rate is to be updated*/
 514         if (baud != tty_termios_baud_rate(old_termios)) {
 515                 switch (baud) {
 516                 case 0:
 517                 case 600:
 518                 case 1200:
 519                 case 1800:
 520                 case 2400:
 521                 case 4800:
 522                 case 7200:
 523                 case 9600:
 524                 case 14400:
 525                 case 19200:
 526                 case 28800:
 527                 case 38400:
 528                 case 55854:
 529                 case 57600:
 530                 case 115200:
 531                 case 127117:
 532                 case 230400:
 533                 case 460800:
 534                 case 921600:
 535                 case 3686400:
 536                         break;
 537                 default:
 538                         baud = 9600;
 539                         break;
 540                 }
 541
 542                 if (baud) {
 543                         dbg("%s - Setting baud rate to %d baud", __func__,
 544                                         baud);
 545                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 546                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 547                                 dev_err(&port->dev, "Baud rate requested not "
 548                                                 "supported by device\n");
 549                                 baud = tty_termios_baud_rate(old_termios);
 550                         }
 551                 }
 552         }
 553         /* Report back the resulting baud rate */
 554         tty_encode_baud_rate(tty, baud, baud);
 555
 556         /* If the number of data bits is to be updated */
 557         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 558                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 559                 bits &= ~BITS_DATA_MASK;
 560                 switch (cflag & CSIZE) {
 561                 case CS5:
 562                         bits |= BITS_DATA_5;
 563                         dbg("%s - data bits = 5", __func__);
 564                         break;
 565                 case CS6:
 566                         bits |= BITS_DATA_6;
 567                         dbg("%s - data bits = 6", __func__);
 568                         break;
 569                 case CS7:
 570                         bits |= BITS_DATA_7;
 571                         dbg("%s - data bits = 7", __func__);
 572                         break;
 573                 case CS8:
 574                         bits |= BITS_DATA_8;
 575                         dbg("%s - data bits = 8", __func__);
 576                         break;
 577                 /*case CS9:
 578                         bits |= BITS_DATA_9;
 579                         dbg("%s - data bits = 9", __func__);
 580                         break;*/
 581                 default:
 582                         dev_err(&port->dev, "cp2101 driver does not "
 583                                         "support the number of bits requested,"
 584                                         " using 8 bit mode\n");
 585                                 bits |= BITS_DATA_8;
 586                                 break;
 587                 }
 588                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 589                         dev_err(&port->dev, "Number of data bits requested "
 590                                         "not supported by device\n");
 591         }
 592
 593         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 594                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 595                 bits &= ~BITS_PARITY_MASK;
 596                 if (cflag & PARENB) {
 597                         if (cflag & PARODD) {
 598                                 bits |= BITS_PARITY_ODD;
 599                                 dbg("%s - parity = ODD", __func__);
 600                         } else {
 601                                 bits |= BITS_PARITY_EVEN;
 602                                 dbg("%s - parity = EVEN", __func__);
 603                         }
 604                 }
 605                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 606                         dev_err(&port->dev, "Parity mode not supported "
 607                                         "by device\n");
 608         }
 609
 610         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 611                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 612                 bits &= ~BITS_STOP_MASK;
 613                 if (cflag & CSTOPB) {
 614                         bits |= BITS_STOP_2;
 615                         dbg("%s - stop bits = 2", __func__);
 616                 } else {
 617                         bits |= BITS_STOP_1;
 618                         dbg("%s - stop bits = 1", __func__);
 619                 }
 620                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 621                         dev_err(&port->dev, "Number of stop bits requested "
 622                                         "not supported by device\n");
 623         }
 624
 625         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 626                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 627                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 628                                 __func__, modem_ctl[0], modem_ctl[1],
 629                                 modem_ctl[2], modem_ctl[3]);
 630
 631                 if (cflag & CRTSCTS) {
 632                         modem_ctl[0] &= ~0x7B;
 633                         modem_ctl[0] |= 0x09;
 634                         modem_ctl[1] = 0x80;
 635                         dbg("%s - flow control = CRTSCTS", __func__);
 636                 } else {
 637                         modem_ctl[0] &= ~0x7B;
 638                         modem_ctl[0] |= 0x01;
 639                         modem_ctl[1] |= 0x40;
 640                         dbg("%s - flow control = NONE", __func__);
 641                 }
 642
 643                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 644                                 __func__, modem_ctl[0], modem_ctl[1],
 645                                 modem_ctl[2], modem_ctl[3]);
 646                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 647         }
 648
 649 }
 650
 651 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
 652                 unsigned int set, unsigned int clear)
 653 {
 654         struct usb_serial_port *port = tty->driver_data;
 655         unsigned int control = 0;
 656
 657         dbg("%s - port %d", __func__, port->number);
 658
 659         if (set & TIOCM_RTS) {
 660                 control |= CONTROL_RTS;
 661                 control |= CONTROL_WRITE_RTS;
 662         }
 663         if (set & TIOCM_DTR) {
 664                 control |= CONTROL_DTR;
 665                 control |= CONTROL_WRITE_DTR;
 666         }
 667         if (clear & TIOCM_RTS) {
 668                 control &= ~CONTROL_RTS;
 669                 control |= CONTROL_WRITE_RTS;
 670         }
 671         if (clear & TIOCM_DTR) {
 672                 control &= ~CONTROL_DTR;
 673                 control |= CONTROL_WRITE_DTR;
 674         }
 675
 676         dbg("%s - control = 0x%.4x", __func__, control);
 677
 678         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 679
 680 }
 681
 682 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
 683 {
 684         struct usb_serial_port *port = tty->driver_data;
 685         unsigned int control;
 686         int result;
 687
 688         dbg("%s - port %d", __func__, port->number);
 689
 690         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 691
 692         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 693                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 694                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 695                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 696                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 697                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 698
 699         dbg("%s - control = 0x%.2x", __func__, control);
 700
 701         return result;
 702 }
 703
 704 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
 705 {
 706         struct usb_serial_port *port = tty->driver_data;
 707         unsigned int state;
 708
 709         dbg("%s - port %d", __func__, port->number);
 710         if (break_state == 0)
 711                 state = BREAK_OFF;
 712         else
 713                 state = BREAK_ON;
 714         dbg("%s - turning break %s", __func__,
 715                         state == BREAK_OFF ? "off" : "on");
 716         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 717 }
 718
 719 static int cp2101_startup(struct usb_serial *serial)
 720 {
 721         /* CP2101 buffers behave strangely unless device is reset */
 722         usb_reset_device(serial->dev);
 723         return 0;
 724 }
 725
 726 static void cp2101_shutdown(struct usb_serial *serial)
 727 {
 728         int i;
 729
 730         dbg("%s", __func__);
 731
 732         /* Stop reads and writes on all ports */
 733         for (i = 0; i < serial->num_ports; ++i)
 734                 cp2101_cleanup(serial->port[i]);
 735 }
 736
 737 static int __init cp2101_init(void)
 738 {
 739         int retval;
 740
 741         retval = usb_serial_register(&cp2101_device);
 742         if (retval)
 743                 return retval; /* Failed to register */
 744
 745         retval = usb_register(&cp2101_driver);
 746         if (retval) {
 747                 /* Failed to register */
 748                 usb_serial_deregister(&cp2101_device);
 749                 return retval;
 750         }
 751
 752         /* Success */
 753         info(DRIVER_DESC " " DRIVER_VERSION);
 754         return 0;
 755 }
 756
 757 static void __exit cp2101_exit(void)
 758 {
 759         usb_deregister(&cp2101_driver);
 760         usb_serial_deregister(&cp2101_device);
 761 }
 762
 763 module_init(cp2101_init);
 764 module_exit(cp2101_exit);
 765
 766 MODULE_DESCRIPTION(DRIVER_DESC);
 767 MODULE_VERSION(DRIVER_VERSION);
 768 MODULE_LICENSE("GPL");
 769
 770 module_param(debug, bool, S_IRUGO | S_IWUSR);
 771 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");