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(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  73         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  74         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  75         { } /* Terminating Entry */
  76 };
  77
  78 MODULE_DEVICE_TABLE (usb, id_table);
  79
  80 static struct usb_driver cp2101_driver = {
  81         .name           = "cp2101",
  82         .probe          = usb_serial_probe,
  83         .disconnect     = usb_serial_disconnect,
  84         .id_table       = id_table,
  85         .no_dynamic_id  =       1,
  86 };
  87
  88 static struct usb_serial_driver cp2101_device = {
  89         .driver = {
  90                 .owner =        THIS_MODULE,
  91                 .name =         "cp2101",
  92         },
  93         .usb_driver             = &cp2101_driver,
  94         .id_table               = id_table,
  95         .num_interrupt_in       = 0,
  96         .num_bulk_in            = 0,
  97         .num_bulk_out           = 0,
  98         .num_ports              = 1,
  99         .open                   = cp2101_open,
 100         .close                  = cp2101_close,
 101         .break_ctl              = cp2101_break_ctl,
 102         .set_termios            = cp2101_set_termios,
 103         .tiocmget               = cp2101_tiocmget,
 104         .tiocmset               = cp2101_tiocmset,
 105         .attach                 = cp2101_startup,
 106         .shutdown               = cp2101_shutdown,
 107 };
 108
 109 /* Config request types */
 110 #define REQTYPE_HOST_TO_DEVICE  0x41
 111 #define REQTYPE_DEVICE_TO_HOST  0xc1
 112
 113 /* Config SET requests. To GET, add 1 to the request number */
 114 #define CP2101_UART             0x00    /* Enable / Disable */
 115 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 116 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 117 #define CP2101_BREAK            0x05    /* On / Off */
 118 #define CP2101_CONTROL          0x07    /* Flow control line states */
 119 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 120 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 121
 122 /* CP2101_UART */
 123 #define UART_ENABLE             0x0001
 124 #define UART_DISABLE            0x0000
 125
 126 /* CP2101_BAUDRATE */
 127 #define BAUD_RATE_GEN_FREQ      0x384000
 128
 129 /* CP2101_BITS */
 130 #define BITS_DATA_MASK          0X0f00
 131 #define BITS_DATA_5             0X0500
 132 #define BITS_DATA_6             0X0600
 133 #define BITS_DATA_7             0X0700
 134 #define BITS_DATA_8             0X0800
 135 #define BITS_DATA_9             0X0900
 136
 137 #define BITS_PARITY_MASK        0x00f0
 138 #define BITS_PARITY_NONE        0x0000
 139 #define BITS_PARITY_ODD         0x0010
 140 #define BITS_PARITY_EVEN        0x0020
 141 #define BITS_PARITY_MARK        0x0030
 142 #define BITS_PARITY_SPACE       0x0040
 143
 144 #define BITS_STOP_MASK          0x000f
 145 #define BITS_STOP_1             0x0000
 146 #define BITS_STOP_1_5           0x0001
 147 #define BITS_STOP_2             0x0002
 148
 149 /* CP2101_BREAK */
 150 #define BREAK_ON                0x0000
 151 #define BREAK_OFF               0x0001
 152
 153 /* CP2101_CONTROL */
 154 #define CONTROL_DTR             0x0001
 155 #define CONTROL_RTS             0x0002
 156 #define CONTROL_CTS             0x0010
 157 #define CONTROL_DSR             0x0020
 158 #define CONTROL_RING            0x0040
 159 #define CONTROL_DCD             0x0080
 160 #define CONTROL_WRITE_DTR       0x0100
 161 #define CONTROL_WRITE_RTS       0x0200
 162
 163 /*
 164  * cp2101_get_config
 165  * Reads from the CP2101 configuration registers
 166  * 'size' is specified in bytes.
 167  * 'data' is a pointer to a pre-allocated array of integers large
 168  * enough to hold 'size' bytes (with 4 bytes to each integer)
 169  */
 170 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 171                 unsigned int *data, int size)
 172 {
 173         struct usb_serial *serial = port->serial;
 174         __le32 *buf;
 175         int result, i, length;
 176
 177         /* Number of integers required to contain the array */
 178         length = (((size - 1) | 3) + 1)/4;
 179
 180         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 181         if (!buf) {
 182                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 183                 return -ENOMEM;
 184         }
 185
 186         /* For get requests, the request number must be incremented */
 187         request++;
 188
 189         /* Issue the request, attempting to read 'size' bytes */
 190         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 191                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 192                                 0, buf, size, 300);
 193
 194         /* Convert data into an array of integers */
 195         for (i=0; i<length; i++)
 196                 data[i] = le32_to_cpu(buf[i]);
 197
 198         kfree(buf);
 199
 200         if (result != size) {
 201                 dev_err(&port->dev, "%s - Unable to send config request, "
 202                                 "request=0x%x size=%d result=%d\n",
 203                                 __FUNCTION__, request, size, result);
 204                 return -EPROTO;
 205         }
 206
 207         return 0;
 208 }
 209
 210 /*
 211  * cp2101_set_config
 212  * Writes to the CP2101 configuration registers
 213  * Values less than 16 bits wide are sent directly
 214  * 'size' is specified in bytes.
 215  */
 216 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 217                 unsigned int *data, int size)
 218 {
 219         struct usb_serial *serial = port->serial;
 220         __le32 *buf;
 221         int result, i, length;
 222
 223         /* Number of integers required to contain the array */
 224         length = (((size - 1) | 3) + 1)/4;
 225
 226         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 227         if (!buf) {
 228                 dev_err(&port->dev, "%s - out of memory.\n",
 229                                 __FUNCTION__);
 230                 return -ENOMEM;
 231         }
 232
 233         /* Array of integers into bytes */
 234         for (i = 0; i < length; i++)
 235                 buf[i] = cpu_to_le32(data[i]);
 236
 237         if (size > 2) {
 238                 result = usb_control_msg (serial->dev,
 239                                 usb_sndctrlpipe(serial->dev, 0),
 240                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 241                                 0, buf, size, 300);
 242         } else {
 243                 result = usb_control_msg (serial->dev,
 244                                 usb_sndctrlpipe(serial->dev, 0),
 245                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 246                                 0, NULL, 0, 300);
 247         }
 248
 249         kfree(buf);
 250
 251         if ((size > 2 && result != size) || result < 0) {
 252                 dev_err(&port->dev, "%s - Unable to send request, "
 253                                 "request=0x%x size=%d result=%d\n",
 254                                 __FUNCTION__, request, size, result);
 255                 return -EPROTO;
 256         }
 257
 258         /* Single data value */
 259         result = usb_control_msg (serial->dev,
 260                         usb_sndctrlpipe(serial->dev, 0),
 261                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 262                         0, NULL, 0, 300);
 263         return 0;
 264 }
 265
 266 /*
 267  * cp2101_set_config_single
 268  * Convenience function for calling cp2101_set_config on single data values
 269  * without requiring an integer pointer
 270  */
 271 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 272                 u8 request, unsigned int data)
 273 {
 274         return cp2101_set_config(port, request, &data, 2);
 275 }
 276
 277 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 278 {
 279         struct usb_serial *serial = port->serial;
 280         int result;
 281
 282         dbg("%s - port %d", __FUNCTION__, port->number);
 283
 284         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 285                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 286                                 __FUNCTION__);
 287                 return -EPROTO;
 288         }
 289
 290         /* Start reading from the device */
 291         usb_fill_bulk_urb (port->read_urb, serial->dev,
 292                         usb_rcvbulkpipe(serial->dev,
 293                         port->bulk_in_endpointAddress),
 294                         port->read_urb->transfer_buffer,
 295                         port->read_urb->transfer_buffer_length,
 296                         serial->type->read_bulk_callback,
 297                         port);
 298         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 299         if (result) {
 300                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 301                                 "error %d\n", __FUNCTION__, result);
 302                 return result;
 303         }
 304
 305         /* Configure the termios structure */
 306         cp2101_get_termios(port);
 307
 308         /* Set the DTR and RTS pins low */
 309         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 310
 311         return 0;
 312 }
 313
 314 static void cp2101_cleanup (struct usb_serial_port *port)
 315 {
 316         struct usb_serial *serial = port->serial;
 317
 318         dbg("%s - port %d", __FUNCTION__, port->number);
 319
 320         if (serial->dev) {
 321                 /* shutdown any bulk reads that might be going on */
 322                 if (serial->num_bulk_out)
 323                         usb_kill_urb(port->write_urb);
 324                 if (serial->num_bulk_in)
 325                         usb_kill_urb(port->read_urb);
 326         }
 327 }
 328
 329 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 330 {
 331         dbg("%s - port %d", __FUNCTION__, port->number);
 332
 333         /* shutdown our urbs */
 334         dbg("%s - shutting down urbs", __FUNCTION__);
 335         usb_kill_urb(port->write_urb);
 336         usb_kill_urb(port->read_urb);
 337
 338         cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 339 }
 340
 341 /*
 342  * cp2101_get_termios
 343  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 344  * from the device, corrects any unsupported values, and configures the
 345  * termios structure to reflect the state of the device
 346  */
 347 static void cp2101_get_termios (struct usb_serial_port *port)
 348 {
 349         unsigned int cflag, modem_ctl[4];
 350         int baud;
 351         int bits;
 352
 353         dbg("%s - port %d", __FUNCTION__, port->number);
 354
 355         if ((!port->tty) || (!port->tty->termios)) {
 356                 dbg("%s - no tty structures", __FUNCTION__);
 357                 return;
 358         }
 359         cflag = port->tty->termios->c_cflag;
 360
 361         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 362         /* Convert to baudrate */
 363         if (baud)
 364                 baud = BAUD_RATE_GEN_FREQ / baud;
 365
 366         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 367         cflag &= ~CBAUD;
 368         switch (baud) {
 369                 /*
 370                  * The baud rates which are commented out below
 371                  * appear to be supported by the device
 372                  * but are non-standard
 373                  */
 374                 case 600:       cflag |= B600;          break;
 375                 case 1200:      cflag |= B1200;         break;
 376                 case 1800:      cflag |= B1800;         break;
 377                 case 2400:      cflag |= B2400;         break;
 378                 case 4800:      cflag |= B4800;         break;
 379                 /*case 7200:    cflag |= B7200;         break;*/
 380                 case 9600:      cflag |= B9600;         break;
 381                 /*case 14400:   cflag |= B14400;        break;*/
 382                 case 19200:     cflag |= B19200;        break;
 383                 /*case 28800:   cflag |= B28800;        break;*/
 384                 case 38400:     cflag |= B38400;        break;
 385                 /*case 55854:   cflag |= B55054;        break;*/
 386                 case 57600:     cflag |= B57600;        break;
 387                 case 115200:    cflag |= B115200;       break;
 388                 /*case 127117:  cflag |= B127117;       break;*/
 389                 case 230400:    cflag |= B230400;       break;
 390                 case 460800:    cflag |= B460800;       break;
 391                 case 921600:    cflag |= B921600;       break;
 392                 /*case 3686400: cflag |= B3686400;      break;*/
 393                 default:
 394                         dbg("%s - Baud rate is not supported, "
 395                                         "using 9600 baud", __FUNCTION__);
 396                         cflag |= B9600;
 397                         cp2101_set_config_single(port, CP2101_BAUDRATE,
 398                                         (BAUD_RATE_GEN_FREQ/9600));
 399                         break;
 400         }
 401
 402         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 403         cflag &= ~CSIZE;
 404         switch(bits & BITS_DATA_MASK) {
 405                 case BITS_DATA_5:
 406                         dbg("%s - data bits = 5", __FUNCTION__);
 407                         cflag |= CS5;
 408                         break;
 409                 case BITS_DATA_6:
 410                         dbg("%s - data bits = 6", __FUNCTION__);
 411                         cflag |= CS6;
 412                         break;
 413                 case BITS_DATA_7:
 414                         dbg("%s - data bits = 7", __FUNCTION__);
 415                         cflag |= CS7;
 416                         break;
 417                 case BITS_DATA_8:
 418                         dbg("%s - data bits = 8", __FUNCTION__);
 419                         cflag |= CS8;
 420                         break;
 421                 case BITS_DATA_9:
 422                         dbg("%s - data bits = 9 (not supported, "
 423                                         "using 8 data bits)", __FUNCTION__);
 424                         cflag |= CS8;
 425                         bits &= ~BITS_DATA_MASK;
 426                         bits |= BITS_DATA_8;
 427                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 428                         break;
 429                 default:
 430                         dbg("%s - Unknown number of data bits, "
 431                                         "using 8", __FUNCTION__);
 432                         cflag |= CS8;
 433                         bits &= ~BITS_DATA_MASK;
 434                         bits |= BITS_DATA_8;
 435                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 436                         break;
 437         }
 438
 439         switch(bits & BITS_PARITY_MASK) {
 440                 case BITS_PARITY_NONE:
 441                         dbg("%s - parity = NONE", __FUNCTION__);
 442                         cflag &= ~PARENB;
 443                         break;
 444                 case BITS_PARITY_ODD:
 445                         dbg("%s - parity = ODD", __FUNCTION__);
 446                         cflag |= (PARENB|PARODD);
 447                         break;
 448                 case BITS_PARITY_EVEN:
 449                         dbg("%s - parity = EVEN", __FUNCTION__);
 450                         cflag &= ~PARODD;
 451                         cflag |= PARENB;
 452                         break;
 453                 case BITS_PARITY_MARK:
 454                         dbg("%s - parity = MARK (not supported, "
 455                                         "disabling parity)", __FUNCTION__);
 456                         cflag &= ~PARENB;
 457                         bits &= ~BITS_PARITY_MASK;
 458                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 459                         break;
 460                 case BITS_PARITY_SPACE:
 461                         dbg("%s - parity = SPACE (not supported, "
 462                                         "disabling parity)", __FUNCTION__);
 463                         cflag &= ~PARENB;
 464                         bits &= ~BITS_PARITY_MASK;
 465                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 466                         break;
 467                 default:
 468                         dbg("%s - Unknown parity mode, "
 469                                         "disabling parity", __FUNCTION__);
 470                         cflag &= ~PARENB;
 471                         bits &= ~BITS_PARITY_MASK;
 472                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 473                         break;
 474         }
 475
 476         cflag &= ~CSTOPB;
 477         switch(bits & BITS_STOP_MASK) {
 478                 case BITS_STOP_1:
 479                         dbg("%s - stop bits = 1", __FUNCTION__);
 480                         break;
 481                 case BITS_STOP_1_5:
 482                         dbg("%s - stop bits = 1.5 (not supported, "
 483                                         "using 1 stop bit)", __FUNCTION__);
 484                         bits &= ~BITS_STOP_MASK;
 485                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 486                         break;
 487                 case BITS_STOP_2:
 488                         dbg("%s - stop bits = 2", __FUNCTION__);
 489                         cflag |= CSTOPB;
 490                         break;
 491                 default:
 492                         dbg("%s - Unknown number of stop bits, "
 493                                         "using 1 stop bit", __FUNCTION__);
 494                         bits &= ~BITS_STOP_MASK;
 495                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 496                         break;
 497         }
 498
 499         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 500         if (modem_ctl[0] & 0x0008) {
 501                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 502                 cflag |= CRTSCTS;
 503         } else {
 504                 dbg("%s - flow control = NONE", __FUNCTION__);
 505                 cflag &= ~CRTSCTS;
 506         }
 507
 508         port->tty->termios->c_cflag = cflag;
 509 }
 510
 511 static void cp2101_set_termios (struct usb_serial_port *port,
 512                 struct ktermios *old_termios)
 513 {
 514         unsigned int cflag, old_cflag=0;
 515         int baud=0, bits;
 516         unsigned int modem_ctl[4];
 517
 518         dbg("%s - port %d", __FUNCTION__, port->number);
 519
 520         if ((!port->tty) || (!port->tty->termios)) {
 521                 dbg("%s - no tty structures", __FUNCTION__);
 522                 return;
 523         }
 524         cflag = port->tty->termios->c_cflag;
 525
 526         /* Check that they really want us to change something */
 527         if (old_termios) {
 528                 if ((cflag == old_termios->c_cflag) &&
 529                                 (RELEVANT_IFLAG(port->tty->termios->c_iflag)
 530                                 == RELEVANT_IFLAG(old_termios->c_iflag))) {
 531                         dbg("%s - nothing to change...", __FUNCTION__);
 532                         return;
 533                 }
 534
 535                 old_cflag = old_termios->c_cflag;
 536         }
 537
 538         /* If the baud rate is to be updated*/
 539         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 540                 switch (cflag & CBAUD) {
 541                         /*
 542                          * The baud rates which are commented out below
 543                          * appear to be supported by the device
 544                          * but are non-standard
 545                          */
 546                         case B0:        baud = 0;       break;
 547                         case B600:      baud = 600;     break;
 548                         case B1200:     baud = 1200;    break;
 549                         case B1800:     baud = 1800;    break;
 550                         case B2400:     baud = 2400;    break;
 551                         case B4800:     baud = 4800;    break;
 552                         /*case B7200:   baud = 7200;    break;*/
 553                         case B9600:     baud = 9600;    break;
 554                         /*ase B14400:   baud = 14400;   break;*/
 555                         case B19200:    baud = 19200;   break;
 556                         /*case B28800:  baud = 28800;   break;*/
 557                         case B38400:    baud = 38400;   break;
 558                         /*case B55854:  baud = 55054;   break;*/
 559                         case B57600:    baud = 57600;   break;
 560                         case B115200:   baud = 115200;  break;
 561                         /*case B127117: baud = 127117;  break;*/
 562                         case B230400:   baud = 230400;  break;
 563                         case B460800:   baud = 460800;  break;
 564                         case B921600:   baud = 921600;  break;
 565                         /*case B3686400:        baud = 3686400; break;*/
 566                         default:
 567                                 dev_err(&port->dev, "cp2101 driver does not "
 568                                         "support the baudrate requested\n");
 569                                 break;
 570                 }
 571
 572                 if (baud) {
 573                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 574                                         baud);
 575                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 576                                                 (BAUD_RATE_GEN_FREQ / baud)))
 577                                 dev_err(&port->dev, "Baud rate requested not "
 578                                                 "supported by device\n");
 579                 }
 580         }
 581
 582         /* If the number of data bits is to be updated */
 583         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 584                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 585                 bits &= ~BITS_DATA_MASK;
 586                 switch (cflag & CSIZE) {
 587                         case CS5:
 588                                 bits |= BITS_DATA_5;
 589                                 dbg("%s - data bits = 5", __FUNCTION__);
 590                                 break;
 591                         case CS6:
 592                                 bits |= BITS_DATA_6;
 593                                 dbg("%s - data bits = 6", __FUNCTION__);
 594                                 break;
 595                         case CS7:
 596                                 bits |= BITS_DATA_7;
 597                                 dbg("%s - data bits = 7", __FUNCTION__);
 598                                 break;
 599                         case CS8:
 600                                 bits |= BITS_DATA_8;
 601                                 dbg("%s - data bits = 8", __FUNCTION__);
 602                                 break;
 603                         /*case CS9:
 604                                 bits |= BITS_DATA_9;
 605                                 dbg("%s - data bits = 9", __FUNCTION__);
 606                                 break;*/
 607                         default:
 608                                 dev_err(&port->dev, "cp2101 driver does not "
 609                                         "support the number of bits requested,"
 610                                         " using 8 bit mode\n");
 611                                 bits |= BITS_DATA_8;
 612                                 break;
 613                 }
 614                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 615                         dev_err(&port->dev, "Number of data bits requested "
 616                                         "not supported by device\n");
 617         }
 618
 619         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 620                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 621                 bits &= ~BITS_PARITY_MASK;
 622                 if (cflag & PARENB) {
 623                         if (cflag & PARODD) {
 624                                 bits |= BITS_PARITY_ODD;
 625                                 dbg("%s - parity = ODD", __FUNCTION__);
 626                         } else {
 627                                 bits |= BITS_PARITY_EVEN;
 628                                 dbg("%s - parity = EVEN", __FUNCTION__);
 629                         }
 630                 }
 631                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 632                         dev_err(&port->dev, "Parity mode not supported "
 633                                         "by device\n");
 634         }
 635
 636         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 637                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 638                 bits &= ~BITS_STOP_MASK;
 639                 if (cflag & CSTOPB) {
 640                         bits |= BITS_STOP_2;
 641                         dbg("%s - stop bits = 2", __FUNCTION__);
 642                 } else {
 643                         bits |= BITS_STOP_1;
 644                         dbg("%s - stop bits = 1", __FUNCTION__);
 645                 }
 646                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 647                         dev_err(&port->dev, "Number of stop bits requested "
 648                                         "not supported by device\n");
 649         }
 650
 651         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 652                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 653                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 654                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 655                                 modem_ctl[2], modem_ctl[3]);
 656
 657                 if (cflag & CRTSCTS) {
 658                         modem_ctl[0] &= ~0x7B;
 659                         modem_ctl[0] |= 0x09;
 660                         modem_ctl[1] = 0x80;
 661                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 662                 } else {
 663                         modem_ctl[0] &= ~0x7B;
 664                         modem_ctl[0] |= 0x01;
 665                         modem_ctl[1] |= 0x40;
 666                         dbg("%s - flow control = NONE", __FUNCTION__);
 667                 }
 668
 669                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 670                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 671                                 modem_ctl[2], modem_ctl[3]);
 672                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 673         }
 674
 675 }
 676
 677 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 678                 unsigned int set, unsigned int clear)
 679 {
 680         int control = 0;
 681
 682         dbg("%s - port %d", __FUNCTION__, port->number);
 683
 684         if (set & TIOCM_RTS) {
 685                 control |= CONTROL_RTS;
 686                 control |= CONTROL_WRITE_RTS;
 687         }
 688         if (set & TIOCM_DTR) {
 689                 control |= CONTROL_DTR;
 690                 control |= CONTROL_WRITE_DTR;
 691         }
 692         if (clear & TIOCM_RTS) {
 693                 control &= ~CONTROL_RTS;
 694                 control |= CONTROL_WRITE_RTS;
 695         }
 696         if (clear & TIOCM_DTR) {
 697                 control &= ~CONTROL_DTR;
 698                 control |= CONTROL_WRITE_DTR;
 699         }
 700
 701         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 702
 703         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 704
 705 }
 706
 707 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 708 {
 709         int control, result;
 710
 711         dbg("%s - port %d", __FUNCTION__, port->number);
 712
 713         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 714
 715         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 716                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 717                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 718                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 719                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 720                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 721
 722         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 723
 724         return result;
 725 }
 726
 727 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 728 {
 729         int state;
 730
 731         dbg("%s - port %d", __FUNCTION__, port->number);
 732         if (break_state == 0)
 733                 state = BREAK_OFF;
 734         else
 735                 state = BREAK_ON;
 736         dbg("%s - turning break %s", __FUNCTION__,
 737                         state==BREAK_OFF ? "off" : "on");
 738         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 739 }
 740
 741 static int cp2101_startup (struct usb_serial *serial)
 742 {
 743         /* CP2101 buffers behave strangely unless device is reset */
 744         usb_reset_device(serial->dev);
 745         return 0;
 746 }
 747
 748 static void cp2101_shutdown (struct usb_serial *serial)
 749 {
 750         int i;
 751
 752         dbg("%s", __FUNCTION__);
 753
 754         /* Stop reads and writes on all ports */
 755         for (i=0; i < serial->num_ports; ++i) {
 756                 cp2101_cleanup(serial->port[i]);
 757         }
 758 }
 759
 760 static int __init cp2101_init (void)
 761 {
 762         int retval;
 763
 764         retval = usb_serial_register(&cp2101_device);
 765         if (retval)
 766                 return retval; /* Failed to register */
 767
 768         retval = usb_register(&cp2101_driver);
 769         if (retval) {
 770                 /* Failed to register */
 771                 usb_serial_deregister(&cp2101_device);
 772                 return retval;
 773         }
 774
 775         /* Success */
 776         info(DRIVER_DESC " " DRIVER_VERSION);
 777         return 0;
 778 }
 779
 780 static void __exit cp2101_exit (void)
 781 {
 782         usb_deregister (&cp2101_driver);
 783         usb_serial_deregister (&cp2101_device);
 784 }
 785
 786 module_init(cp2101_init);
 787 module_exit(cp2101_exit);
 788
 789 MODULE_DESCRIPTION(DRIVER_DESC);
 790 MODULE_VERSION(DRIVER_VERSION);
 791 MODULE_LICENSE("GPL");
 792
 793 module_param(debug, bool, S_IRUGO | S_IWUSR);
 794 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");