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 tty_struct *, struct usb_serial_port *,
  40                                                         struct file*);
  41 static void cp2101_get_termios(struct tty_struct *,
  42         struct usb_serial_port *port);
  43 static void cp2101_get_termios_port(struct usb_serial_port *port,
  44         unsigned int *cflagp, unsigned int *baudp);
  45 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
  46                                                         struct ktermios*);
  47 static int cp2101_tiocmget(struct tty_struct *, struct file *);
  48 static int cp2101_tiocmset(struct tty_struct *, struct file *,
  49                 unsigned int, unsigned int);
  50 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *,
  51                 unsigned int, unsigned int);
  52 static void cp2101_break_ctl(struct tty_struct *, int);
  53 static int cp2101_startup(struct usb_serial *);
  54 static void cp2101_shutdown(struct usb_serial *);
  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, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
  95         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  96         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  97         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  98         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  99         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 100         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 101         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 102         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 103         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 104         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 105         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 106         { } /* Terminating Entry */
 107 };
 108
 109 MODULE_DEVICE_TABLE(usb, id_table);
 110
 111 static struct usb_driver cp2101_driver = {
 112         .name           = "cp2101",
 113         .probe          = usb_serial_probe,
 114         .disconnect     = usb_serial_disconnect,
 115         .id_table       = id_table,
 116         .no_dynamic_id  =       1,
 117 };
 118
 119 static struct usb_serial_driver cp2101_device = {
 120         .driver = {
 121                 .owner =        THIS_MODULE,
 122                 .name =         "cp2101",
 123         },
 124         .usb_driver             = &cp2101_driver,
 125         .id_table               = id_table,
 126         .num_ports              = 1,
 127         .open                   = cp2101_open,
 128         .close                  = cp2101_close,
 129         .break_ctl              = cp2101_break_ctl,
 130         .set_termios            = cp2101_set_termios,
 131         .tiocmget               = cp2101_tiocmget,
 132         .tiocmset               = cp2101_tiocmset,
 133         .attach                 = cp2101_startup,
 134         .shutdown               = cp2101_shutdown,
 135 };
 136
 137 /* Config request types */
 138 #define REQTYPE_HOST_TO_DEVICE  0x41
 139 #define REQTYPE_DEVICE_TO_HOST  0xc1
 140
 141 /* Config SET requests. To GET, add 1 to the request number */
 142 #define CP2101_UART             0x00    /* Enable / Disable */
 143 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 144 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 145 #define CP2101_BREAK            0x05    /* On / Off */
 146 #define CP2101_CONTROL          0x07    /* Flow control line states */
 147 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 148 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 149
 150 /* CP2101_UART */
 151 #define UART_ENABLE             0x0001
 152 #define UART_DISABLE            0x0000
 153
 154 /* CP2101_BAUDRATE */
 155 #define BAUD_RATE_GEN_FREQ      0x384000
 156
 157 /* CP2101_BITS */
 158 #define BITS_DATA_MASK          0X0f00
 159 #define BITS_DATA_5             0X0500
 160 #define BITS_DATA_6             0X0600
 161 #define BITS_DATA_7             0X0700
 162 #define BITS_DATA_8             0X0800
 163 #define BITS_DATA_9             0X0900
 164
 165 #define BITS_PARITY_MASK        0x00f0
 166 #define BITS_PARITY_NONE        0x0000
 167 #define BITS_PARITY_ODD         0x0010
 168 #define BITS_PARITY_EVEN        0x0020
 169 #define BITS_PARITY_MARK        0x0030
 170 #define BITS_PARITY_SPACE       0x0040
 171
 172 #define BITS_STOP_MASK          0x000f
 173 #define BITS_STOP_1             0x0000
 174 #define BITS_STOP_1_5           0x0001
 175 #define BITS_STOP_2             0x0002
 176
 177 /* CP2101_BREAK */
 178 #define BREAK_ON                0x0000
 179 #define BREAK_OFF               0x0001
 180
 181 /* CP2101_CONTROL */
 182 #define CONTROL_DTR             0x0001
 183 #define CONTROL_RTS             0x0002
 184 #define CONTROL_CTS             0x0010
 185 #define CONTROL_DSR             0x0020
 186 #define CONTROL_RING            0x0040
 187 #define CONTROL_DCD             0x0080
 188 #define CONTROL_WRITE_DTR       0x0100
 189 #define CONTROL_WRITE_RTS       0x0200
 190
 191 /*
 192  * cp2101_get_config
 193  * Reads from the CP2101 configuration registers
 194  * 'size' is specified in bytes.
 195  * 'data' is a pointer to a pre-allocated array of integers large
 196  * enough to hold 'size' bytes (with 4 bytes to each integer)
 197  */
 198 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
 199                 unsigned int *data, int size)
 200 {
 201         struct usb_serial *serial = port->serial;
 202         __le32 *buf;
 203         int result, i, length;
 204
 205         /* Number of integers required to contain the array */
 206         length = (((size - 1) | 3) + 1)/4;
 207
 208         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 209         if (!buf) {
 210                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 211                 return -ENOMEM;
 212         }
 213
 214         /* For get requests, the request number must be incremented */
 215         request++;
 216
 217         /* Issue the request, attempting to read 'size' bytes */
 218         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 219                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 220                                 0, buf, size, 300);
 221
 222         /* Convert data into an array of integers */
 223         for (i = 0; i < length; i++)
 224                 data[i] = le32_to_cpu(buf[i]);
 225
 226         kfree(buf);
 227
 228         if (result != size) {
 229                 dbg("%s - Unable to send config request, "
 230                                 "request=0x%x size=%d result=%d\n",
 231                                 __func__, request, size, result);
 232                 return -EPROTO;
 233         }
 234
 235         return 0;
 236 }
 237
 238 /*
 239  * cp2101_set_config
 240  * Writes to the CP2101 configuration registers
 241  * Values less than 16 bits wide are sent directly
 242  * 'size' is specified in bytes.
 243  */
 244 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
 245                 unsigned int *data, int size)
 246 {
 247         struct usb_serial *serial = port->serial;
 248         __le32 *buf;
 249         int result, i, length;
 250
 251         /* Number of integers required to contain the array */
 252         length = (((size - 1) | 3) + 1)/4;
 253
 254         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 255         if (!buf) {
 256                 dev_err(&port->dev, "%s - out of memory.\n",
 257                                 __func__);
 258                 return -ENOMEM;
 259         }
 260
 261         /* Array of integers into bytes */
 262         for (i = 0; i < length; i++)
 263                 buf[i] = cpu_to_le32(data[i]);
 264
 265         if (size > 2) {
 266                 result = usb_control_msg(serial->dev,
 267                                 usb_sndctrlpipe(serial->dev, 0),
 268                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 269                                 0, buf, size, 300);
 270         } else {
 271                 result = usb_control_msg(serial->dev,
 272                                 usb_sndctrlpipe(serial->dev, 0),
 273                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 274                                 0, NULL, 0, 300);
 275         }
 276
 277         kfree(buf);
 278
 279         if ((size > 2 && result != size) || result < 0) {
 280                 dbg("%s - Unable to send request, "
 281                                 "request=0x%x size=%d result=%d\n",
 282                                 __func__, request, size, result);
 283                 return -EPROTO;
 284         }
 285
 286         /* Single data value */
 287         result = usb_control_msg(serial->dev,
 288                         usb_sndctrlpipe(serial->dev, 0),
 289                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 290                         0, NULL, 0, 300);
 291         return 0;
 292 }
 293
 294 /*
 295  * cp2101_set_config_single
 296  * Convenience function for calling cp2101_set_config on single data values
 297  * without requiring an integer pointer
 298  */
 299 static inline int cp2101_set_config_single(struct usb_serial_port *port,
 300                 u8 request, unsigned int data)
 301 {
 302         return cp2101_set_config(port, request, &data, 2);
 303 }
 304
 305 /*
 306  * cp2101_quantise_baudrate
 307  * Quantises the baud rate as per AN205 Table 1
 308  */
 309 static unsigned int cp2101_quantise_baudrate(unsigned int baud) {
 310         if      (baud <= 56)       baud = 0;
 311         else if (baud <= 300)      baud = 300;
 312         else if (baud <= 600)      baud = 600;
 313         else if (baud <= 1200)     baud = 1200;
 314         else if (baud <= 1800)     baud = 1800;
 315         else if (baud <= 2400)     baud = 2400;
 316         else if (baud <= 4000)     baud = 4000;
 317         else if (baud <= 4803)     baud = 4800;
 318         else if (baud <= 7207)     baud = 7200;
 319         else if (baud <= 9612)     baud = 9600;
 320         else if (baud <= 14428)    baud = 14400;
 321         else if (baud <= 16062)    baud = 16000;
 322         else if (baud <= 19250)    baud = 19200;
 323         else if (baud <= 28912)    baud = 28800;
 324         else if (baud <= 38601)    baud = 38400;
 325         else if (baud <= 51558)    baud = 51200;
 326         else if (baud <= 56280)    baud = 56000;
 327         else if (baud <= 58053)    baud = 57600;
 328         else if (baud <= 64111)    baud = 64000;
 329         else if (baud <= 77608)    baud = 76800;
 330         else if (baud <= 117028)   baud = 115200;
 331         else if (baud <= 129347)   baud = 128000;
 332         else if (baud <= 156868)   baud = 153600;
 333         else if (baud <= 237832)   baud = 230400;
 334         else if (baud <= 254234)   baud = 250000;
 335         else if (baud <= 273066)   baud = 256000;
 336         else if (baud <= 491520)   baud = 460800;
 337         else if (baud <= 567138)   baud = 500000;
 338         else if (baud <= 670254)   baud = 576000;
 339         else if (baud <= 1053257)  baud = 921600;
 340         else if (baud <= 1474560)  baud = 1228800;
 341         else if (baud <= 2457600)  baud = 1843200;
 342         else                       baud = 3686400;
 343         return baud;
 344 }
 345
 346 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
 347                                 struct file *filp)
 348 {
 349         struct usb_serial *serial = port->serial;
 350         int result;
 351
 352         dbg("%s - port %d", __func__, port->number);
 353
 354         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 355                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 356                                 __func__);
 357                 return -EPROTO;
 358         }
 359
 360         /* Start reading from the device */
 361         usb_fill_bulk_urb(port->read_urb, serial->dev,
 362                         usb_rcvbulkpipe(serial->dev,
 363                         port->bulk_in_endpointAddress),
 364                         port->read_urb->transfer_buffer,
 365                         port->read_urb->transfer_buffer_length,
 366                         serial->type->read_bulk_callback,
 367                         port);
 368         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 369         if (result) {
 370                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 371                                 "error %d\n", __func__, result);
 372                 return result;
 373         }
 374
 375         /* Configure the termios structure */
 376         cp2101_get_termios(tty, port);
 377
 378         /* Set the DTR and RTS pins low */
 379         cp2101_tiocmset_port(tty ? (struct usb_serial_port *) tty->driver_data
 380                         : port,
 381                 NULL, TIOCM_DTR | TIOCM_RTS, 0);
 382
 383         return 0;
 384 }
 385
 386 static void cp2101_cleanup(struct usb_serial_port *port)
 387 {
 388         struct usb_serial *serial = port->serial;
 389
 390         dbg("%s - port %d", __func__, port->number);
 391
 392         if (serial->dev) {
 393                 /* shutdown any bulk reads that might be going on */
 394                 if (serial->num_bulk_out)
 395                         usb_kill_urb(port->write_urb);
 396                 if (serial->num_bulk_in)
 397                         usb_kill_urb(port->read_urb);
 398         }
 399 }
 400
 401 static void cp2101_close(struct tty_struct *tty, struct usb_serial_port *port,
 402                                         struct file *filp)
 403 {
 404         dbg("%s - port %d", __func__, port->number);
 405
 406         /* shutdown our urbs */
 407         dbg("%s - shutting down urbs", __func__);
 408         usb_kill_urb(port->write_urb);
 409         usb_kill_urb(port->read_urb);
 410
 411         mutex_lock(&port->serial->disc_mutex);
 412         if (!port->serial->disconnected)
 413                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 414         mutex_unlock(&port->serial->disc_mutex);
 415 }
 416
 417 /*
 418  * cp2101_get_termios
 419  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 420  * from the device, corrects any unsupported values, and configures the
 421  * termios structure to reflect the state of the device
 422  */
 423 static void cp2101_get_termios(struct tty_struct *tty,
 424         struct usb_serial_port *port)
 425 {
 426         unsigned int baud;
 427
 428         if (tty) {
 429                 cp2101_get_termios_port(tty->driver_data,
 430                         &tty->termios->c_cflag, &baud);
 431                 tty_encode_baud_rate(tty, baud, baud);
 432         }
 433
 434         else {
 435                 unsigned int cflag;
 436                 cflag = 0;
 437                 cp2101_get_termios_port(port, &cflag, &baud);
 438         }
 439 }
 440
 441 /*
 442  * cp2101_get_termios_port
 443  * This is the heart of cp2101_get_termios which always uses a &usb_serial_port.
 444  */
 445 static void cp2101_get_termios_port(struct usb_serial_port *port,
 446         unsigned int *cflagp, unsigned int *baudp)
 447 {
 448         unsigned int cflag, modem_ctl[4];
 449         unsigned int baud;
 450         unsigned int bits;
 451
 452         dbg("%s - port %d", __func__, port->number);
 453
 454         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 455         /* Convert to baudrate */
 456         if (baud)
 457                 baud = cp2101_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 458
 459         dbg("%s - baud rate = %d", __func__, baud);
 460         *baudp = baud;
 461
 462         cflag = *cflagp;
 463
 464         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 465         cflag &= ~CSIZE;
 466         switch (bits & BITS_DATA_MASK) {
 467         case BITS_DATA_5:
 468                 dbg("%s - data bits = 5", __func__);
 469                 cflag |= CS5;
 470                 break;
 471         case BITS_DATA_6:
 472                 dbg("%s - data bits = 6", __func__);
 473                 cflag |= CS6;
 474                 break;
 475         case BITS_DATA_7:
 476                 dbg("%s - data bits = 7", __func__);
 477                 cflag |= CS7;
 478                 break;
 479         case BITS_DATA_8:
 480                 dbg("%s - data bits = 8", __func__);
 481                 cflag |= CS8;
 482                 break;
 483         case BITS_DATA_9:
 484                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 485                                                                 __func__);
 486                 cflag |= CS8;
 487                 bits &= ~BITS_DATA_MASK;
 488                 bits |= BITS_DATA_8;
 489                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 490                 break;
 491         default:
 492                 dbg("%s - Unknown number of data bits, using 8", __func__);
 493                 cflag |= CS8;
 494                 bits &= ~BITS_DATA_MASK;
 495                 bits |= BITS_DATA_8;
 496                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 497                 break;
 498         }
 499
 500         switch (bits & BITS_PARITY_MASK) {
 501         case BITS_PARITY_NONE:
 502                 dbg("%s - parity = NONE", __func__);
 503                 cflag &= ~PARENB;
 504                 break;
 505         case BITS_PARITY_ODD:
 506                 dbg("%s - parity = ODD", __func__);
 507                 cflag |= (PARENB|PARODD);
 508                 break;
 509         case BITS_PARITY_EVEN:
 510                 dbg("%s - parity = EVEN", __func__);
 511                 cflag &= ~PARODD;
 512                 cflag |= PARENB;
 513                 break;
 514         case BITS_PARITY_MARK:
 515                 dbg("%s - parity = MARK (not supported, disabling parity)",
 516                                 __func__);
 517                 cflag &= ~PARENB;
 518                 bits &= ~BITS_PARITY_MASK;
 519                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 520                 break;
 521         case BITS_PARITY_SPACE:
 522                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 523                                 __func__);
 524                 cflag &= ~PARENB;
 525                 bits &= ~BITS_PARITY_MASK;
 526                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 527                 break;
 528         default:
 529                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 530                 cflag &= ~PARENB;
 531                 bits &= ~BITS_PARITY_MASK;
 532                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 533                 break;
 534         }
 535
 536         cflag &= ~CSTOPB;
 537         switch (bits & BITS_STOP_MASK) {
 538         case BITS_STOP_1:
 539                 dbg("%s - stop bits = 1", __func__);
 540                 break;
 541         case BITS_STOP_1_5:
 542                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 543                                                                 __func__);
 544                 bits &= ~BITS_STOP_MASK;
 545                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 546                 break;
 547         case BITS_STOP_2:
 548                 dbg("%s - stop bits = 2", __func__);
 549                 cflag |= CSTOPB;
 550                 break;
 551         default:
 552                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 553                                                                 __func__);
 554                 bits &= ~BITS_STOP_MASK;
 555                 cp2101_set_config(port, CP2101_BITS, &bits, 2);
 556                 break;
 557         }
 558
 559         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 560         if (modem_ctl[0] & 0x0008) {
 561                 dbg("%s - flow control = CRTSCTS", __func__);
 562                 cflag |= CRTSCTS;
 563         } else {
 564                 dbg("%s - flow control = NONE", __func__);
 565                 cflag &= ~CRTSCTS;
 566         }
 567
 568         *cflagp = cflag;
 569 }
 570
 571 static void cp2101_set_termios(struct tty_struct *tty,
 572                 struct usb_serial_port *port, struct ktermios *old_termios)
 573 {
 574         unsigned int cflag, old_cflag;
 575         unsigned int baud = 0, bits;
 576         unsigned int modem_ctl[4];
 577
 578         dbg("%s - port %d", __func__, port->number);
 579
 580         if (!tty)
 581                 return;
 582
 583         tty->termios->c_cflag &= ~CMSPAR;
 584         cflag = tty->termios->c_cflag;
 585         old_cflag = old_termios->c_cflag;
 586         baud = cp2101_quantise_baudrate(tty_get_baud_rate(tty));
 587
 588         /* If the baud rate is to be updated*/
 589         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 590                 dbg("%s - Setting baud rate to %d baud", __func__,
 591                                 baud);
 592                 if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 593                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 594                         dbg("Baud rate requested not supported by device\n");
 595                         baud = tty_termios_baud_rate(old_termios);
 596                 }
 597         }
 598         /* Report back the resulting baud rate */
 599         tty_encode_baud_rate(tty, baud, baud);
 600
 601         /* If the number of data bits is to be updated */
 602         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 603                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 604                 bits &= ~BITS_DATA_MASK;
 605                 switch (cflag & CSIZE) {
 606                 case CS5:
 607                         bits |= BITS_DATA_5;
 608                         dbg("%s - data bits = 5", __func__);
 609                         break;
 610                 case CS6:
 611                         bits |= BITS_DATA_6;
 612                         dbg("%s - data bits = 6", __func__);
 613                         break;
 614                 case CS7:
 615                         bits |= BITS_DATA_7;
 616                         dbg("%s - data bits = 7", __func__);
 617                         break;
 618                 case CS8:
 619                         bits |= BITS_DATA_8;
 620                         dbg("%s - data bits = 8", __func__);
 621                         break;
 622                 /*case CS9:
 623                         bits |= BITS_DATA_9;
 624                         dbg("%s - data bits = 9", __func__);
 625                         break;*/
 626                 default:
 627                         dbg("cp2101 driver does not "
 628                                         "support the number of bits requested,"
 629                                         " using 8 bit mode\n");
 630                                 bits |= BITS_DATA_8;
 631                                 break;
 632                 }
 633                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 634                         dbg("Number of data bits requested "
 635                                         "not supported by device\n");
 636         }
 637
 638         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 639                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 640                 bits &= ~BITS_PARITY_MASK;
 641                 if (cflag & PARENB) {
 642                         if (cflag & PARODD) {
 643                                 bits |= BITS_PARITY_ODD;
 644                                 dbg("%s - parity = ODD", __func__);
 645                         } else {
 646                                 bits |= BITS_PARITY_EVEN;
 647                                 dbg("%s - parity = EVEN", __func__);
 648                         }
 649                 }
 650                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 651                         dbg("Parity mode not supported "
 652                                         "by device\n");
 653         }
 654
 655         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 656                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 657                 bits &= ~BITS_STOP_MASK;
 658                 if (cflag & CSTOPB) {
 659                         bits |= BITS_STOP_2;
 660                         dbg("%s - stop bits = 2", __func__);
 661                 } else {
 662                         bits |= BITS_STOP_1;
 663                         dbg("%s - stop bits = 1", __func__);
 664                 }
 665                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 666                         dbg("Number of stop bits requested "
 667                                         "not supported by device\n");
 668         }
 669
 670         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 671                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 672                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 673                                 __func__, modem_ctl[0], modem_ctl[1],
 674                                 modem_ctl[2], modem_ctl[3]);
 675
 676                 if (cflag & CRTSCTS) {
 677                         modem_ctl[0] &= ~0x7B;
 678                         modem_ctl[0] |= 0x09;
 679                         modem_ctl[1] = 0x80;
 680                         dbg("%s - flow control = CRTSCTS", __func__);
 681                 } else {
 682                         modem_ctl[0] &= ~0x7B;
 683                         modem_ctl[0] |= 0x01;
 684                         modem_ctl[1] |= 0x40;
 685                         dbg("%s - flow control = NONE", __func__);
 686                 }
 687
 688                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 689                                 __func__, modem_ctl[0], modem_ctl[1],
 690                                 modem_ctl[2], modem_ctl[3]);
 691                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 692         }
 693
 694 }
 695
 696 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
 697                 unsigned int set, unsigned int clear)
 698 {
 699         struct usb_serial_port *port = tty->driver_data;
 700         return cp2101_tiocmset_port(port, file, set, clear);
 701 }
 702
 703 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *file,
 704                 unsigned int set, unsigned int clear)
 705 {
 706         unsigned int control = 0;
 707
 708         dbg("%s - port %d", __func__, port->number);
 709
 710         if (set & TIOCM_RTS) {
 711                 control |= CONTROL_RTS;
 712                 control |= CONTROL_WRITE_RTS;
 713         }
 714         if (set & TIOCM_DTR) {
 715                 control |= CONTROL_DTR;
 716                 control |= CONTROL_WRITE_DTR;
 717         }
 718         if (clear & TIOCM_RTS) {
 719                 control &= ~CONTROL_RTS;
 720                 control |= CONTROL_WRITE_RTS;
 721         }
 722         if (clear & TIOCM_DTR) {
 723                 control &= ~CONTROL_DTR;
 724                 control |= CONTROL_WRITE_DTR;
 725         }
 726
 727         dbg("%s - control = 0x%.4x", __func__, control);
 728
 729         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 730 }
 731
 732 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
 733 {
 734         struct usb_serial_port *port = tty->driver_data;
 735         unsigned int control;
 736         int result;
 737
 738         dbg("%s - port %d", __func__, port->number);
 739
 740         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 741
 742         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 743                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 744                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 745                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 746                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 747                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 748
 749         dbg("%s - control = 0x%.2x", __func__, control);
 750
 751         return result;
 752 }
 753
 754 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
 755 {
 756         struct usb_serial_port *port = tty->driver_data;
 757         unsigned int state;
 758
 759         dbg("%s - port %d", __func__, port->number);
 760         if (break_state == 0)
 761                 state = BREAK_OFF;
 762         else
 763                 state = BREAK_ON;
 764         dbg("%s - turning break %s", __func__,
 765                         state == BREAK_OFF ? "off" : "on");
 766         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 767 }
 768
 769 static int cp2101_startup(struct usb_serial *serial)
 770 {
 771         /* CP2101 buffers behave strangely unless device is reset */
 772         usb_reset_device(serial->dev);
 773         return 0;
 774 }
 775
 776 static void cp2101_shutdown(struct usb_serial *serial)
 777 {
 778         int i;
 779
 780         dbg("%s", __func__);
 781
 782         /* Stop reads and writes on all ports */
 783         for (i = 0; i < serial->num_ports; ++i)
 784                 cp2101_cleanup(serial->port[i]);
 785 }
 786
 787 static int __init cp2101_init(void)
 788 {
 789         int retval;
 790
 791         retval = usb_serial_register(&cp2101_device);
 792         if (retval)
 793                 return retval; /* Failed to register */
 794
 795         retval = usb_register(&cp2101_driver);
 796         if (retval) {
 797                 /* Failed to register */
 798                 usb_serial_deregister(&cp2101_device);
 799                 return retval;
 800         }
 801
 802         /* Success */
 803         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 804                DRIVER_DESC "\n");
 805         return 0;
 806 }
 807
 808 static void __exit cp2101_exit(void)
 809 {
 810         usb_deregister(&cp2101_driver);
 811         usb_serial_deregister(&cp2101_device);
 812 }
 813
 814 module_init(cp2101_init);
 815 module_exit(cp2101_exit);
 816
 817 MODULE_DESCRIPTION(DRIVER_DESC);
 818 MODULE_VERSION(DRIVER_VERSION);
 819 MODULE_LICENSE("GPL");
 820
 821 module_param(debug, bool, S_IRUGO | S_IWUSR);
 822 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");