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