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(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  60         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  63         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  64         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  65         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  66         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  67         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  68         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  69         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  70         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  71         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  72         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  73         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  74         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  75         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  76         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  77         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  78         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  79         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  80         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  81         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  82         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  83         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  84         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  85         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  86         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  87         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  88         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  89         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
  90         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
  91         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  92         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
  93         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
  94         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  95         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  96         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  97         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  98         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  99         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 100         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 101         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 102         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 103         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 104         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 105         { } /* Terminating Entry */
 106 };
 107
 108 MODULE_DEVICE_TABLE(usb, id_table);
 109
 110 static struct usb_driver cp2101_driver = {
 111         .name           = "cp2101",
 112         .probe          = usb_serial_probe,
 113         .disconnect     = usb_serial_disconnect,
 114         .id_table       = id_table,
 115         .no_dynamic_id  =       1,
 116 };
 117
 118 static struct usb_serial_driver cp2101_device = {
 119         .driver = {
 120                 .owner =        THIS_MODULE,
 121                 .name =         "cp2101",
 122         },
 123         .usb_driver             = &cp2101_driver,
 124         .id_table               = id_table,
 125         .num_ports              = 1,
 126         .open                   = cp2101_open,
 127         .close                  = cp2101_close,
 128         .break_ctl              = cp2101_break_ctl,
 129         .set_termios            = cp2101_set_termios,
 130         .tiocmget               = cp2101_tiocmget,
 131         .tiocmset               = cp2101_tiocmset,
 132         .attach                 = cp2101_startup,
 133         .shutdown               = cp2101_shutdown,
 134 };
 135
 136 /* Config request types */
 137 #define REQTYPE_HOST_TO_DEVICE  0x41
 138 #define REQTYPE_DEVICE_TO_HOST  0xc1
 139
 140 /* Config SET requests. To GET, add 1 to the request number */
 141 #define CP2101_UART             0x00    /* Enable / Disable */
 142 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 143 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 144 #define CP2101_BREAK            0x05    /* On / Off */
 145 #define CP2101_CONTROL          0x07    /* Flow control line states */
 146 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 147 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 148
 149 /* CP2101_UART */
 150 #define UART_ENABLE             0x0001
 151 #define UART_DISABLE            0x0000
 152
 153 /* CP2101_BAUDRATE */
 154 #define BAUD_RATE_GEN_FREQ      0x384000
 155
 156 /* CP2101_BITS */
 157 #define BITS_DATA_MASK          0X0f00
 158 #define BITS_DATA_5             0X0500
 159 #define BITS_DATA_6             0X0600
 160 #define BITS_DATA_7             0X0700
 161 #define BITS_DATA_8             0X0800
 162 #define BITS_DATA_9             0X0900
 163
 164 #define BITS_PARITY_MASK        0x00f0
 165 #define BITS_PARITY_NONE        0x0000
 166 #define BITS_PARITY_ODD         0x0010
 167 #define BITS_PARITY_EVEN        0x0020
 168 #define BITS_PARITY_MARK        0x0030
 169 #define BITS_PARITY_SPACE       0x0040
 170
 171 #define BITS_STOP_MASK          0x000f
 172 #define BITS_STOP_1             0x0000
 173 #define BITS_STOP_1_5           0x0001
 174 #define BITS_STOP_2             0x0002
 175
 176 /* CP2101_BREAK */
 177 #define BREAK_ON                0x0000
 178 #define BREAK_OFF               0x0001
 179
 180 /* CP2101_CONTROL */
 181 #define CONTROL_DTR             0x0001
 182 #define CONTROL_RTS             0x0002
 183 #define CONTROL_CTS             0x0010
 184 #define CONTROL_DSR             0x0020
 185 #define CONTROL_RING            0x0040
 186 #define CONTROL_DCD             0x0080
 187 #define CONTROL_WRITE_DTR       0x0100
 188 #define CONTROL_WRITE_RTS       0x0200
 189
 190 /*
 191  * cp2101_get_config
 192  * Reads from the CP2101 configuration registers
 193  * 'size' is specified in bytes.
 194  * 'data' is a pointer to a pre-allocated array of integers large
 195  * enough to hold 'size' bytes (with 4 bytes to each integer)
 196  */
 197 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
 198                 unsigned int *data, int size)
 199 {
 200         struct usb_serial *serial = port->serial;
 201         __le32 *buf;
 202         int result, i, length;
 203
 204         /* Number of integers required to contain the array */
 205         length = (((size - 1) | 3) + 1)/4;
 206
 207         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 208         if (!buf) {
 209                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 210                 return -ENOMEM;
 211         }
 212
 213         /* For get requests, the request number must be incremented */
 214         request++;
 215
 216         /* Issue the request, attempting to read 'size' bytes */
 217         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 218                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 219                                 0, buf, size, 300);
 220
 221         /* Convert data into an array of integers */
 222         for (i = 0; i < length; i++)
 223                 data[i] = le32_to_cpu(buf[i]);
 224
 225         kfree(buf);
 226
 227         if (result != size) {
 228                 dev_err(&port->dev, "%s - Unable to send config request, "
 229                                 "request=0x%x size=%d result=%d\n",
 230                                 __func__, request, size, result);
 231                 return -EPROTO;
 232         }
 233
 234         return 0;
 235 }
 236
 237 /*
 238  * cp2101_set_config
 239  * Writes to the CP2101 configuration registers
 240  * Values less than 16 bits wide are sent directly
 241  * 'size' is specified in bytes.
 242  */
 243 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
 244                 unsigned int *data, int size)
 245 {
 246         struct usb_serial *serial = port->serial;
 247         __le32 *buf;
 248         int result, i, length;
 249
 250         /* Number of integers required to contain the array */
 251         length = (((size - 1) | 3) + 1)/4;
 252
 253         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 254         if (!buf) {
 255                 dev_err(&port->dev, "%s - out of memory.\n",
 256                                 __func__);
 257                 return -ENOMEM;
 258         }
 259
 260         /* Array of integers into bytes */
 261         for (i = 0; i < length; i++)
 262                 buf[i] = cpu_to_le32(data[i]);
 263
 264         if (size > 2) {
 265                 result = usb_control_msg(serial->dev,
 266                                 usb_sndctrlpipe(serial->dev, 0),
 267                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 268                                 0, buf, size, 300);
 269         } else {
 270                 result = usb_control_msg(serial->dev,
 271                                 usb_sndctrlpipe(serial->dev, 0),
 272                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 273                                 0, NULL, 0, 300);
 274         }
 275
 276         kfree(buf);
 277
 278         if ((size > 2 && result != size) || result < 0) {
 279                 dev_err(&port->dev, "%s - Unable to send request, "
 280                                 "request=0x%x size=%d result=%d\n",
 281                                 __func__, request, size, result);
 282                 return -EPROTO;
 283         }
 284
 285         /* Single data value */
 286         result = usb_control_msg(serial->dev,
 287                         usb_sndctrlpipe(serial->dev, 0),
 288                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 289                         0, NULL, 0, 300);
 290         return 0;
 291 }
 292
 293 /*
 294  * cp2101_set_config_single
 295  * Convenience function for calling cp2101_set_config on single data values
 296  * without requiring an integer pointer
 297  */
 298 static inline int cp2101_set_config_single(struct usb_serial_port *port,
 299                 u8 request, unsigned int data)
 300 {
 301         return cp2101_set_config(port, request, &data, 2);
 302 }
 303
 304 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
 305                                 struct file *filp)
 306 {
 307         struct usb_serial *serial = port->serial;
 308         int result;
 309
 310         dbg("%s - port %d", __func__, port->number);
 311
 312         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 313                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 314                                 __func__);
 315                 return -EPROTO;
 316         }
 317
 318         /* Start reading from the device */
 319         usb_fill_bulk_urb(port->read_urb, serial->dev,
 320                         usb_rcvbulkpipe(serial->dev,
 321                         port->bulk_in_endpointAddress),
 322                         port->read_urb->transfer_buffer,
 323                         port->read_urb->transfer_buffer_length,
 324                         serial->type->read_bulk_callback,
 325                         port);
 326         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 327         if (result) {
 328                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 329                                 "error %d\n", __func__, result);
 330                 return result;
 331         }
 332
 333         /* Configure the termios structure */
 334         cp2101_get_termios(tty);
 335
 336         /* Set the DTR and RTS pins low */
 337         cp2101_tiocmset(tty, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 338
 339         return 0;
 340 }
 341
 342 static void cp2101_cleanup(struct usb_serial_port *port)
 343 {
 344         struct usb_serial *serial = port->serial;
 345
 346         dbg("%s - port %d", __func__, port->number);
 347
 348         if (serial->dev) {
 349                 /* shutdown any bulk reads that might be going on */
 350                 if (serial->num_bulk_out)
 351                         usb_kill_urb(port->write_urb);
 352                 if (serial->num_bulk_in)
 353                         usb_kill_urb(port->read_urb);
 354         }
 355 }
 356
 357 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
 358                                         struct file *filp)
 359 {
 360         dbg("%s - port %d", __func__, port->number);
 361
 362         /* shutdown our urbs */
 363         dbg("%s - shutting down urbs", __func__);
 364         usb_kill_urb(port->write_urb);
 365         usb_kill_urb(port->read_urb);
 366
 367         mutex_lock(&port->serial->disc_mutex);
 368         if (!port->serial->disconnected)
 369                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 370         mutex_unlock(&port->serial->disc_mutex);
 371 }
 372
 373 /*
 374  * cp2101_get_termios
 375  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 376  * from the device, corrects any unsupported values, and configures the
 377  * termios structure to reflect the state of the device
 378  */
 379 static void cp2101_get_termios (struct tty_struct *tty)
 380 {
 381         struct usb_serial_port *port = tty->driver_data;
 382         unsigned int cflag, modem_ctl[4];
 383         unsigned int baud;
 384         unsigned int bits;
 385
 386         dbg("%s - port %d", __func__, port->number);
 387
 388         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 389         /* Convert to baudrate */
 390         if (baud)
 391                 baud = BAUD_RATE_GEN_FREQ / baud;
 392
 393         dbg("%s - baud rate = %d", __func__, baud);
 394
 395         tty_encode_baud_rate(tty, baud, baud);
 396         cflag = tty->termios->c_cflag;
 397
 398         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 399         cflag &= ~CSIZE;
 400         switch (bits & BITS_DATA_MASK) {
 401         case BITS_DATA_5:
 402                 dbg("%s - data bits = 5", __func__);
 403                 cflag |= CS5;
 404                 break;
 405         case BITS_DATA_6:
 406                 dbg("%s - data bits = 6", __func__);
 407                 cflag |= CS6;
 408                 break;
 409         case BITS_DATA_7:
 410                 dbg("%s - data bits = 7", __func__);
 411                 cflag |= CS7;
 412                 break;
 413         case BITS_DATA_8:
 414                 dbg("%s - data bits = 8", __func__);
 415                 cflag |= CS8;
 416                 break;
 417         case BITS_DATA_9:
 418                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 419                                                                 __func__);
 420                 cflag |= CS8;
 421                 bits &= ~BITS_DATA_MASK;
 422                 bits |= BITS_DATA_8;
 423                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 424                 break;
 425         default:
 426                 dbg("%s - Unknown number of data bits, using 8", __func__);
 427                 cflag |= CS8;
 428                 bits &= ~BITS_DATA_MASK;
 429                 bits |= BITS_DATA_8;
 430                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 431                 break;
 432         }
 433
 434         switch (bits & BITS_PARITY_MASK) {
 435         case BITS_PARITY_NONE:
 436                 dbg("%s - parity = NONE", __func__);
 437                 cflag &= ~PARENB;
 438                 break;
 439         case BITS_PARITY_ODD:
 440                 dbg("%s - parity = ODD", __func__);
 441                 cflag |= (PARENB|PARODD);
 442                 break;
 443         case BITS_PARITY_EVEN:
 444                 dbg("%s - parity = EVEN", __func__);
 445                 cflag &= ~PARODD;
 446                 cflag |= PARENB;
 447                 break;
 448         case BITS_PARITY_MARK:
 449                 dbg("%s - parity = MARK (not supported, disabling parity)",
 450                                 __func__);
 451                 cflag &= ~PARENB;
 452                 bits &= ~BITS_PARITY_MASK;
 453                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 454                 break;
 455         case BITS_PARITY_SPACE:
 456                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 457                                 __func__);
 458                 cflag &= ~PARENB;
 459                 bits &= ~BITS_PARITY_MASK;
 460                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 461                 break;
 462         default:
 463                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 464                 cflag &= ~PARENB;
 465                 bits &= ~BITS_PARITY_MASK;
 466                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 467                 break;
 468         }
 469
 470         cflag &= ~CSTOPB;
 471         switch (bits & BITS_STOP_MASK) {
 472         case BITS_STOP_1:
 473                 dbg("%s - stop bits = 1", __func__);
 474                 break;
 475         case BITS_STOP_1_5:
 476                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 477                                                                 __func__);
 478                 bits &= ~BITS_STOP_MASK;
 479                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 480                 break;
 481         case BITS_STOP_2:
 482                 dbg("%s - stop bits = 2", __func__);
 483                 cflag |= CSTOPB;
 484                 break;
 485         default:
 486                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 487                                                                 __func__);
 488                 bits &= ~BITS_STOP_MASK;
 489                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 490                 break;
 491         }
 492
 493         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 494         if (modem_ctl[0] & 0x0008) {
 495                 dbg("%s - flow control = CRTSCTS", __func__);
 496                 cflag |= CRTSCTS;
 497         } else {
 498                 dbg("%s - flow control = NONE", __func__);
 499                 cflag &= ~CRTSCTS;
 500         }
 501
 502         tty->termios->c_cflag = cflag;
 503 }
 504
 505 static void cp2101_set_termios(struct tty_struct *tty,
 506                 struct usb_serial_port *port, struct ktermios *old_termios)
 507 {
 508         unsigned int cflag, old_cflag;
 509         unsigned int baud = 0, bits;
 510         unsigned int modem_ctl[4];
 511
 512         dbg("%s - port %d", __func__, port->number);
 513
 514         if (!tty)
 515                 return;
 516
 517         tty->termios->c_cflag &= ~CMSPAR;
 518         cflag = tty->termios->c_cflag;
 519         old_cflag = old_termios->c_cflag;
 520         baud = tty_get_baud_rate(tty);
 521
 522         /* If the baud rate is to be updated*/
 523         if (baud != tty_termios_baud_rate(old_termios)) {
 524                 switch (baud) {
 525                 case 0:
 526                 case 600:
 527                 case 1200:
 528                 case 1800:
 529                 case 2400:
 530                 case 4800:
 531                 case 7200:
 532                 case 9600:
 533                 case 14400:
 534                 case 19200:
 535                 case 28800:
 536                 case 38400:
 537                 case 55854:
 538                 case 57600:
 539                 case 115200:
 540                 case 127117:
 541                 case 230400:
 542                 case 460800:
 543                 case 921600:
 544                 case 3686400:
 545                         break;
 546                 default:
 547                         baud = 9600;
 548                         break;
 549                 }
 550
 551                 if (baud) {
 552                         dbg("%s - Setting baud rate to %d baud", __func__,
 553                                         baud);
 554                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 555                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 556                                 dev_err(&port->dev, "Baud rate requested not "
 557                                                 "supported by device\n");
 558                                 baud = tty_termios_baud_rate(old_termios);
 559                         }
 560                 }
 561         }
 562         /* Report back the resulting baud rate */
 563         tty_encode_baud_rate(tty, baud, baud);
 564
 565         /* If the number of data bits is to be updated */
 566         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 567                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 568                 bits &= ~BITS_DATA_MASK;
 569                 switch (cflag & CSIZE) {
 570                 case CS5:
 571                         bits |= BITS_DATA_5;
 572                         dbg("%s - data bits = 5", __func__);
 573                         break;
 574                 case CS6:
 575                         bits |= BITS_DATA_6;
 576                         dbg("%s - data bits = 6", __func__);
 577                         break;
 578                 case CS7:
 579                         bits |= BITS_DATA_7;
 580                         dbg("%s - data bits = 7", __func__);
 581                         break;
 582                 case CS8:
 583                         bits |= BITS_DATA_8;
 584                         dbg("%s - data bits = 8", __func__);
 585                         break;
 586                 /*case CS9:
 587                         bits |= BITS_DATA_9;
 588                         dbg("%s - data bits = 9", __func__);
 589                         break;*/
 590                 default:
 591                         dev_err(&port->dev, "cp2101 driver does not "
 592                                         "support the number of bits requested,"
 593                                         " using 8 bit mode\n");
 594                                 bits |= BITS_DATA_8;
 595                                 break;
 596                 }
 597                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 598                         dev_err(&port->dev, "Number of data bits requested "
 599                                         "not supported by device\n");
 600         }
 601
 602         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 603                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 604                 bits &= ~BITS_PARITY_MASK;
 605                 if (cflag & PARENB) {
 606                         if (cflag & PARODD) {
 607                                 bits |= BITS_PARITY_ODD;
 608                                 dbg("%s - parity = ODD", __func__);
 609                         } else {
 610                                 bits |= BITS_PARITY_EVEN;
 611                                 dbg("%s - parity = EVEN", __func__);
 612                         }
 613                 }
 614                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 615                         dev_err(&port->dev, "Parity mode not supported "
 616                                         "by device\n");
 617         }
 618
 619         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 620                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 621                 bits &= ~BITS_STOP_MASK;
 622                 if (cflag & CSTOPB) {
 623                         bits |= BITS_STOP_2;
 624                         dbg("%s - stop bits = 2", __func__);
 625                 } else {
 626                         bits |= BITS_STOP_1;
 627                         dbg("%s - stop bits = 1", __func__);
 628                 }
 629                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 630                         dev_err(&port->dev, "Number of stop bits requested "
 631                                         "not supported by device\n");
 632         }
 633
 634         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 635                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 636                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 637                                 __func__, modem_ctl[0], modem_ctl[1],
 638                                 modem_ctl[2], modem_ctl[3]);
 639
 640                 if (cflag & CRTSCTS) {
 641                         modem_ctl[0] &= ~0x7B;
 642                         modem_ctl[0] |= 0x09;
 643                         modem_ctl[1] = 0x80;
 644                         dbg("%s - flow control = CRTSCTS", __func__);
 645                 } else {
 646                         modem_ctl[0] &= ~0x7B;
 647                         modem_ctl[0] |= 0x01;
 648                         modem_ctl[1] |= 0x40;
 649                         dbg("%s - flow control = NONE", __func__);
 650                 }
 651
 652                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 653                                 __func__, modem_ctl[0], modem_ctl[1],
 654                                 modem_ctl[2], modem_ctl[3]);
 655                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 656         }
 657
 658 }
 659
 660 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
 661                 unsigned int set, unsigned int clear)
 662 {
 663         struct usb_serial_port *port = tty->driver_data;
 664         unsigned int control = 0;
 665
 666         dbg("%s - port %d", __func__, port->number);
 667
 668         if (set & TIOCM_RTS) {
 669                 control |= CONTROL_RTS;
 670                 control |= CONTROL_WRITE_RTS;
 671         }
 672         if (set & TIOCM_DTR) {
 673                 control |= CONTROL_DTR;
 674                 control |= CONTROL_WRITE_DTR;
 675         }
 676         if (clear & TIOCM_RTS) {
 677                 control &= ~CONTROL_RTS;
 678                 control |= CONTROL_WRITE_RTS;
 679         }
 680         if (clear & TIOCM_DTR) {
 681                 control &= ~CONTROL_DTR;
 682                 control |= CONTROL_WRITE_DTR;
 683         }
 684
 685         dbg("%s - control = 0x%.4x", __func__, control);
 686
 687         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 688
 689 }
 690
 691 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
 692 {
 693         struct usb_serial_port *port = tty->driver_data;
 694         unsigned int control;
 695         int result;
 696
 697         dbg("%s - port %d", __func__, port->number);
 698
 699         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 700
 701         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 702                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 703                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 704                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 705                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 706                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 707
 708         dbg("%s - control = 0x%.2x", __func__, control);
 709
 710         return result;
 711 }
 712
 713 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
 714 {
 715         struct usb_serial_port *port = tty->driver_data;
 716         unsigned int state;
 717
 718         dbg("%s - port %d", __func__, port->number);
 719         if (break_state == 0)
 720                 state = BREAK_OFF;
 721         else
 722                 state = BREAK_ON;
 723         dbg("%s - turning break %s", __func__,
 724                         state == BREAK_OFF ? "off" : "on");
 725         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 726 }
 727
 728 static int cp2101_startup(struct usb_serial *serial)
 729 {
 730         /* CP2101 buffers behave strangely unless device is reset */
 731         usb_reset_device(serial->dev);
 732         return 0;
 733 }
 734
 735 static void cp2101_shutdown(struct usb_serial *serial)
 736 {
 737         int i;
 738
 739         dbg("%s", __func__);
 740
 741         /* Stop reads and writes on all ports */
 742         for (i = 0; i < serial->num_ports; ++i)
 743                 cp2101_cleanup(serial->port[i]);
 744 }
 745
 746 static int __init cp2101_init(void)
 747 {
 748         int retval;
 749
 750         retval = usb_serial_register(&cp2101_device);
 751         if (retval)
 752                 return retval; /* Failed to register */
 753
 754         retval = usb_register(&cp2101_driver);
 755         if (retval) {
 756                 /* Failed to register */
 757                 usb_serial_deregister(&cp2101_device);
 758                 return retval;
 759         }
 760
 761         /* Success */
 762         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 763                DRIVER_DESC "\n");
 764         return 0;
 765 }
 766
 767 static void __exit cp2101_exit(void)
 768 {
 769         usb_deregister(&cp2101_driver);
 770         usb_serial_deregister(&cp2101_device);
 771 }
 772
 773 module_init(cp2101_init);
 774 module_exit(cp2101_exit);
 775
 776 MODULE_DESCRIPTION(DRIVER_DESC);
 777 MODULE_VERSION(DRIVER_VERSION);
 778 MODULE_LICENSE("GPL");
 779
 780 module_param(debug, bool, S_IRUGO | S_IWUSR);
 781 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");