drivers/usb/serial/cp2101.c

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