drivers/usb/serial/cp210x.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  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_flip.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/usb.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb/serial.h>
  26
  27 /*
  28  * Version Information
  29  */
  30 #define DRIVER_VERSION "v0.08"
  31 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  32
  33 /*
  34  * Function Prototypes
  35  */
  36 static int cp2101_open(struct tty_struct *, struct usb_serial_port *,
  37                                                         struct file *);
  38 static void cp2101_cleanup(struct usb_serial_port *);
  39 static void cp2101_close(struct usb_serial_port *);
  40 static void cp2101_get_termios(struct tty_struct *,
  41         struct usb_serial_port *port);
  42 static void cp2101_get_termios_port(struct usb_serial_port *port,
  43         unsigned int *cflagp, unsigned int *baudp);
  44 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
  45                                                         struct ktermios*);
  46 static int cp2101_tiocmget(struct tty_struct *, struct file *);
  47 static int cp2101_tiocmset(struct tty_struct *, struct file *,
  48                 unsigned int, unsigned int);
  49 static int cp2101_tiocmset_port(struct usb_serial_port *port, 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 static int debug;
  56
  57 static struct usb_device_id id_table [] = {
  58         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  59         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  60         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  61         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  62         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  63         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  65         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  66         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  67         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  68         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  69         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  70         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  71         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  72         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  73         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  74         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  75         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  76         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  77         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  78         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  79         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  80         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  81         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  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, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
  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                 dbg("%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                 dbg("%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 /*
 305  * cp2101_quantise_baudrate
 306  * Quantises the baud rate as per AN205 Table 1
 307  */
 308 static unsigned int cp2101_quantise_baudrate(unsigned int baud) {
 309         if      (baud <= 56)       baud = 0;
 310         else if (baud <= 300)      baud = 300;
 311         else if (baud <= 600)      baud = 600;
 312         else if (baud <= 1200)     baud = 1200;
 313         else if (baud <= 1800)     baud = 1800;
 314         else if (baud <= 2400)     baud = 2400;
 315         else if (baud <= 4000)     baud = 4000;
 316         else if (baud <= 4803)     baud = 4800;
 317         else if (baud <= 7207)     baud = 7200;
 318         else if (baud <= 9612)     baud = 9600;
 319         else if (baud <= 14428)    baud = 14400;
 320         else if (baud <= 16062)    baud = 16000;
 321         else if (baud <= 19250)    baud = 19200;
 322         else if (baud <= 28912)    baud = 28800;
 323         else if (baud <= 38601)    baud = 38400;
 324         else if (baud <= 51558)    baud = 51200;
 325         else if (baud <= 56280)    baud = 56000;
 326         else if (baud <= 58053)    baud = 57600;
 327         else if (baud <= 64111)    baud = 64000;
 328         else if (baud <= 77608)    baud = 76800;
 329         else if (baud <= 117028)   baud = 115200;
 330         else if (baud <= 129347)   baud = 128000;
 331         else if (baud <= 156868)   baud = 153600;
 332         else if (baud <= 237832)   baud = 230400;
 333         else if (baud <= 254234)   baud = 250000;
 334         else if (baud <= 273066)   baud = 256000;
 335         else if (baud <= 491520)   baud = 460800;
 336         else if (baud <= 567138)   baud = 500000;
 337         else if (baud <= 670254)   baud = 576000;
 338         else if (baud <= 1053257)  baud = 921600;
 339         else if (baud <= 1474560)  baud = 1228800;
 340         else if (baud <= 2457600)  baud = 1843200;
 341         else                       baud = 3686400;
 342         return baud;
 343 }
 344
 345 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
 346                                 struct file *filp)
 347 {
 348         struct usb_serial *serial = port->serial;
 349         int result;
 350
 351         dbg("%s - port %d", __func__, port->number);
 352
 353         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 354                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 355                                 __func__);
 356                 return -EPROTO;
 357         }
 358
 359         /* Start reading from the device */
 360         usb_fill_bulk_urb(port->read_urb, serial->dev,
 361                         usb_rcvbulkpipe(serial->dev,
 362                         port->bulk_in_endpointAddress),
 363                         port->read_urb->transfer_buffer,
 364                         port->read_urb->transfer_buffer_length,
 365                         serial->type->read_bulk_callback,
 366                         port);
 367         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 368         if (result) {
 369                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 370                                 "error %d\n", __func__, result);
 371                 return result;
 372         }
 373
 374         /* Configure the termios structure */
 375         cp2101_get_termios(tty, port);
 376
 377         /* Set the DTR and RTS pins low */
 378         cp2101_tiocmset_port(tty ? (struct usb_serial_port *) tty->driver_data
 379                         : port,
 380                 NULL, TIOCM_DTR | TIOCM_RTS, 0);
 381
 382         return 0;
 383 }
 384
 385 static void cp2101_cleanup(struct usb_serial_port *port)
 386 {
 387         struct usb_serial *serial = port->serial;
 388
 389         dbg("%s - port %d", __func__, port->number);
 390
 391         if (serial->dev) {
 392                 /* shutdown any bulk reads that might be going on */
 393                 if (serial->num_bulk_out)
 394                         usb_kill_urb(port->write_urb);
 395                 if (serial->num_bulk_in)
 396                         usb_kill_urb(port->read_urb);
 397         }
 398 }
 399
 400 static void cp2101_close(struct usb_serial_port *port)
 401 {
 402         dbg("%s - port %d", __func__, port->number);
 403
 404         /* shutdown our urbs */
 405         dbg("%s - shutting down urbs", __func__);
 406         usb_kill_urb(port->write_urb);
 407         usb_kill_urb(port->read_urb);
 408
 409         mutex_lock(&port->serial->disc_mutex);
 410         if (!port->serial->disconnected)
 411                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 412         mutex_unlock(&port->serial->disc_mutex);
 413 }
 414
 415 /*
 416  * cp2101_get_termios
 417  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 418  * from the device, corrects any unsupported values, and configures the
 419  * termios structure to reflect the state of the device
 420  */
 421 static void cp2101_get_termios(struct tty_struct *tty,
 422         struct usb_serial_port *port)
 423 {
 424         unsigned int baud;
 425
 426         if (tty) {
 427                 cp2101_get_termios_port(tty->driver_data,
 428                         &tty->termios->c_cflag, &baud);
 429                 tty_encode_baud_rate(tty, baud, baud);
 430         }
 431
 432         else {
 433                 unsigned int cflag;
 434                 cflag = 0;
 435                 cp2101_get_termios_port(port, &cflag, &baud);
 436         }
 437 }
 438
 439 /*
 440  * cp2101_get_termios_port
 441  * This is the heart of cp2101_get_termios which always uses a &usb_serial_port.
 442  */
 443 static void cp2101_get_termios_port(struct usb_serial_port *port,
 444         unsigned int *cflagp, unsigned int *baudp)
 445 {
 446         unsigned int cflag, modem_ctl[4];
 447         unsigned int baud;
 448         unsigned int bits;
 449
 450         dbg("%s - port %d", __func__, port->number);
 451
 452         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 453         /* Convert to baudrate */
 454         if (baud)
 455                 baud = cp2101_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 456
 457         dbg("%s - baud rate = %d", __func__, baud);
 458         *baudp = baud;
 459
 460         cflag = *cflagp;
 461
 462         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 463         cflag &= ~CSIZE;
 464         switch (bits & BITS_DATA_MASK) {
 465         case BITS_DATA_5:
 466                 dbg("%s - data bits = 5", __func__);
 467                 cflag |= CS5;
 468                 break;
 469         case BITS_DATA_6:
 470                 dbg("%s - data bits = 6", __func__);
 471                 cflag |= CS6;
 472                 break;
 473         case BITS_DATA_7:
 474                 dbg("%s - data bits = 7", __func__);
 475                 cflag |= CS7;
 476                 break;
 477         case BITS_DATA_8:
 478                 dbg("%s - data bits = 8", __func__);
 479                 cflag |= CS8;
 480                 break;
 481         case BITS_DATA_9:
 482                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 483                                                                 __func__);
 484                 cflag |= CS8;
 485                 bits &= ~BITS_DATA_MASK;
 486                 bits |= BITS_DATA_8;
 487                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 488                 break;
 489         default:
 490                 dbg("%s - Unknown number of data bits, using 8", __func__);
 491                 cflag |= CS8;
 492                 bits &= ~BITS_DATA_MASK;
 493                 bits |= BITS_DATA_8;
 494                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 495                 break;
 496         }
 497
 498         switch (bits & BITS_PARITY_MASK) {
 499         case BITS_PARITY_NONE:
 500                 dbg("%s - parity = NONE", __func__);
 501                 cflag &= ~PARENB;
 502                 break;
 503         case BITS_PARITY_ODD:
 504                 dbg("%s - parity = ODD", __func__);
 505                 cflag |= (PARENB|PARODD);
 506                 break;
 507         case BITS_PARITY_EVEN:
 508                 dbg("%s - parity = EVEN", __func__);
 509                 cflag &= ~PARODD;
 510                 cflag |= PARENB;
 511                 break;
 512         case BITS_PARITY_MARK:
 513                 dbg("%s - parity = MARK (not supported, disabling parity)",
 514                                 __func__);
 515                 cflag &= ~PARENB;
 516                 bits &= ~BITS_PARITY_MASK;
 517                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 518                 break;
 519         case BITS_PARITY_SPACE:
 520                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 521                                 __func__);
 522                 cflag &= ~PARENB;
 523                 bits &= ~BITS_PARITY_MASK;
 524                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 525                 break;
 526         default:
 527                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 528                 cflag &= ~PARENB;
 529                 bits &= ~BITS_PARITY_MASK;
 530                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 531                 break;
 532         }
 533
 534         cflag &= ~CSTOPB;
 535         switch (bits & BITS_STOP_MASK) {
 536         case BITS_STOP_1:
 537                 dbg("%s - stop bits = 1", __func__);
 538                 break;
 539         case BITS_STOP_1_5:
 540                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 541                                                                 __func__);
 542                 bits &= ~BITS_STOP_MASK;
 543                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 544                 break;
 545         case BITS_STOP_2:
 546                 dbg("%s - stop bits = 2", __func__);
 547                 cflag |= CSTOPB;
 548                 break;
 549         default:
 550                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 551                                                                 __func__);
 552                 bits &= ~BITS_STOP_MASK;
 553                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 554                 break;
 555         }
 556
 557         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 558         if (modem_ctl[0] & 0x0008) {
 559                 dbg("%s - flow control = CRTSCTS", __func__);
 560                 cflag |= CRTSCTS;
 561         } else {
 562                 dbg("%s - flow control = NONE", __func__);
 563                 cflag &= ~CRTSCTS;
 564         }
 565
 566         *cflagp = cflag;
 567 }
 568
 569 static void cp2101_set_termios(struct tty_struct *tty,
 570                 struct usb_serial_port *port, struct ktermios *old_termios)
 571 {
 572         unsigned int cflag, old_cflag;
 573         unsigned int baud = 0, bits;
 574         unsigned int modem_ctl[4];
 575
 576         dbg("%s - port %d", __func__, port->number);
 577
 578         if (!tty)
 579                 return;
 580
 581         tty->termios->c_cflag &= ~CMSPAR;
 582         cflag = tty->termios->c_cflag;
 583         old_cflag = old_termios->c_cflag;
 584         baud = cp2101_quantise_baudrate(tty_get_baud_rate(tty));
 585
 586         /* If the baud rate is to be updated*/
 587         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 588                 dbg("%s - Setting baud rate to %d baud", __func__,
 589                                 baud);
 590                 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 591                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 592                         dbg("Baud rate requested not supported by device\n");
 593                         baud = tty_termios_baud_rate(old_termios);
 594                 }
 595         }
 596         /* Report back the resulting baud rate */
 597         tty_encode_baud_rate(tty, baud, baud);
 598
 599         /* If the number of data bits is to be updated */
 600         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 601                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 602                 bits &= ~BITS_DATA_MASK;
 603                 switch (cflag & CSIZE) {
 604                 case CS5:
 605                         bits |= BITS_DATA_5;
 606                         dbg("%s - data bits = 5", __func__);
 607                         break;
 608                 case CS6:
 609                         bits |= BITS_DATA_6;
 610                         dbg("%s - data bits = 6", __func__);
 611                         break;
 612                 case CS7:
 613                         bits |= BITS_DATA_7;
 614                         dbg("%s - data bits = 7", __func__);
 615                         break;
 616                 case CS8:
 617                         bits |= BITS_DATA_8;
 618                         dbg("%s - data bits = 8", __func__);
 619                         break;
 620                 /*case CS9:
 621                         bits |= BITS_DATA_9;
 622                         dbg("%s - data bits = 9", __func__);
 623                         break;*/
 624                 default:
 625                         dbg("cp2101 driver does not "
 626                                         "support the number of bits requested,"
 627                                         " using 8 bit mode\n");
 628                                 bits |= BITS_DATA_8;
 629                                 break;
 630                 }
 631                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 632                         dbg("Number of data bits requested "
 633                                         "not supported by device\n");
 634         }
 635
 636         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 637                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 638                 bits &= ~BITS_PARITY_MASK;
 639                 if (cflag & PARENB) {
 640                         if (cflag & PARODD) {
 641                                 bits |= BITS_PARITY_ODD;
 642                                 dbg("%s - parity = ODD", __func__);
 643                         } else {
 644                                 bits |= BITS_PARITY_EVEN;
 645                                 dbg("%s - parity = EVEN", __func__);
 646                         }
 647                 }
 648                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 649                         dbg("Parity mode not supported "
 650                                         "by device\n");
 651         }
 652
 653         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 654                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 655                 bits &= ~BITS_STOP_MASK;
 656                 if (cflag & CSTOPB) {
 657                         bits |= BITS_STOP_2;
 658                         dbg("%s - stop bits = 2", __func__);
 659                 } else {
 660                         bits |= BITS_STOP_1;
 661                         dbg("%s - stop bits = 1", __func__);
 662                 }
 663                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 664                         dbg("Number of stop bits requested "
 665                                         "not supported by device\n");
 666         }
 667
 668         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 669                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 670                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 671                                 __func__, modem_ctl[0], modem_ctl[1],
 672                                 modem_ctl[2], modem_ctl[3]);
 673
 674                 if (cflag & CRTSCTS) {
 675                         modem_ctl[0] &= ~0x7B;
 676                         modem_ctl[0] |= 0x09;
 677                         modem_ctl[1] = 0x80;
 678                         dbg("%s - flow control = CRTSCTS", __func__);
 679                 } else {
 680                         modem_ctl[0] &= ~0x7B;
 681                         modem_ctl[0] |= 0x01;
 682                         modem_ctl[1] |= 0x40;
 683                         dbg("%s - flow control = NONE", __func__);
 684                 }
 685
 686                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 687                                 __func__, modem_ctl[0], modem_ctl[1],
 688                                 modem_ctl[2], modem_ctl[3]);
 689                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 690         }
 691
 692 }
 693
 694 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
 695                 unsigned int set, unsigned int clear)
 696 {
 697         struct usb_serial_port *port = tty->driver_data;
 698         return cp2101_tiocmset_port(port, file, set, clear);
 699 }
 700
 701 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *file,
 702                 unsigned int set, unsigned int clear)
 703 {
 704         unsigned int control = 0;
 705
 706         dbg("%s - port %d", __func__, port->number);
 707
 708         if (set & TIOCM_RTS) {
 709                 control |= CONTROL_RTS;
 710                 control |= CONTROL_WRITE_RTS;
 711         }
 712         if (set & TIOCM_DTR) {
 713                 control |= CONTROL_DTR;
 714                 control |= CONTROL_WRITE_DTR;
 715         }
 716         if (clear & TIOCM_RTS) {
 717                 control &= ~CONTROL_RTS;
 718                 control |= CONTROL_WRITE_RTS;
 719         }
 720         if (clear & TIOCM_DTR) {
 721                 control &= ~CONTROL_DTR;
 722                 control |= CONTROL_WRITE_DTR;
 723         }
 724
 725         dbg("%s - control = 0x%.4x", __func__, control);
 726
 727         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 728 }
 729
 730 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
 731 {
 732         struct usb_serial_port *port = tty->driver_data;
 733         unsigned int control;
 734         int result;
 735
 736         dbg("%s - port %d", __func__, port->number);
 737
 738         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 739
 740         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 741                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 742                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 743                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 744                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 745                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 746
 747         dbg("%s - control = 0x%.2x", __func__, control);
 748
 749         return result;
 750 }
 751
 752 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
 753 {
 754         struct usb_serial_port *port = tty->driver_data;
 755         unsigned int state;
 756
 757         dbg("%s - port %d", __func__, port->number);
 758         if (break_state == 0)
 759                 state = BREAK_OFF;
 760         else
 761                 state = BREAK_ON;
 762         dbg("%s - turning break %s", __func__,
 763                         state == BREAK_OFF ? "off" : "on");
 764         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 765 }
 766
 767 static int cp2101_startup(struct usb_serial *serial)
 768 {
 769         /* CP2101 buffers behave strangely unless device is reset */
 770         usb_reset_device(serial->dev);
 771         return 0;
 772 }
 773
 774 static void cp2101_shutdown(struct usb_serial *serial)
 775 {
 776         int i;
 777
 778         dbg("%s", __func__);
 779
 780         /* Stop reads and writes on all ports */
 781         for (i = 0; i < serial->num_ports; ++i)
 782                 cp2101_cleanup(serial->port[i]);
 783 }
 784
 785 static int __init cp2101_init(void)
 786 {
 787         int retval;
 788
 789         retval = usb_serial_register(&cp2101_device);
 790         if (retval)
 791                 return retval; /* Failed to register */
 792
 793         retval = usb_register(&cp2101_driver);
 794         if (retval) {
 795                 /* Failed to register */
 796                 usb_serial_deregister(&cp2101_device);
 797                 return retval;
 798         }
 799
 800         /* Success */
 801         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 802                DRIVER_DESC "\n");
 803         return 0;
 804 }
 805
 806 static void __exit cp2101_exit(void)
 807 {
 808         usb_deregister(&cp2101_driver);
 809         usb_serial_deregister(&cp2101_device);
 810 }
 811
 812 module_init(cp2101_init);
 813 module_exit(cp2101_exit);
 814
 815 MODULE_DESCRIPTION(DRIVER_DESC);
 816 MODULE_VERSION(DRIVER_VERSION);
 817 MODULE_LICENSE("GPL");
 818
 819 module_param(debug, bool, S_IRUGO | S_IWUSR);
 820 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");