drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP210x 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 "v0.09"
  31 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver"
  32
  33 /*
  34  * Function Prototypes
  35  */
  36 static int cp210x_open(struct tty_struct *, struct usb_serial_port *,
  37                                                         struct file *);
  38 static void cp210x_cleanup(struct usb_serial_port *);
  39 static void cp210x_close(struct usb_serial_port *);
  40 static void cp210x_get_termios(struct tty_struct *,
  41         struct usb_serial_port *port);
  42 static void cp210x_get_termios_port(struct usb_serial_port *port,
  43         unsigned int *cflagp, unsigned int *baudp);
  44 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  45                                                         struct ktermios*);
  46 static int cp210x_tiocmget(struct tty_struct *, struct file *);
  47 static int cp210x_tiocmset(struct tty_struct *, struct file *,
  48                 unsigned int, unsigned int);
  49 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
  50                 unsigned int, unsigned int);
  51 static void cp210x_break_ctl(struct tty_struct *, int);
  52 static int cp210x_startup(struct usb_serial *);
  53 static void cp210x_disconnect(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(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  63         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  65         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  66         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  67         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  68         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  69         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  70         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  71         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  72         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  73         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  74         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  75         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  76         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  77         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  78         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  79         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  80         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  81         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  82         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  83         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  84         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  85         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  86         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  87         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  88         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  89         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  90         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  91         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  92         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  93         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
  94         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  95         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
  96         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
  97         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  98         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
  99         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 100         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 101         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 102         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 103         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 104         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 105         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 106         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 107         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 108         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 109         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 110         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 111         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 112         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 113         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 114         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 115         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 116         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 117         { } /* Terminating Entry */
 118 };
 119
 120 MODULE_DEVICE_TABLE(usb, id_table);
 121
 122 static struct usb_driver cp210x_driver = {
 123         .name           = "cp210x",
 124         .probe          = usb_serial_probe,
 125         .disconnect     = usb_serial_disconnect,
 126         .id_table       = id_table,
 127         .no_dynamic_id  =       1,
 128 };
 129
 130 static struct usb_serial_driver cp210x_device = {
 131         .driver = {
 132                 .owner =        THIS_MODULE,
 133                 .name =         "cp210x",
 134         },
 135         .usb_driver             = &cp210x_driver,
 136         .id_table               = id_table,
 137         .num_ports              = 1,
 138         .open                   = cp210x_open,
 139         .close                  = cp210x_close,
 140         .break_ctl              = cp210x_break_ctl,
 141         .set_termios            = cp210x_set_termios,
 142         .tiocmget               = cp210x_tiocmget,
 143         .tiocmset               = cp210x_tiocmset,
 144         .attach                 = cp210x_startup,
 145         .disconnect             = cp210x_disconnect,
 146 };
 147
 148 /* Config request types */
 149 #define REQTYPE_HOST_TO_DEVICE  0x41
 150 #define REQTYPE_DEVICE_TO_HOST  0xc1
 151
 152 /* Config request codes */
 153 #define CP210X_IFC_ENABLE       0x00
 154 #define CP210X_SET_BAUDDIV      0x01
 155 #define CP210X_GET_BAUDDIV      0x02
 156 #define CP210X_SET_LINE_CTL     0x03
 157 #define CP210X_GET_LINE_CTL     0x04
 158 #define CP210X_SET_BREAK        0x05
 159 #define CP210X_IMM_CHAR         0x06
 160 #define CP210X_SET_MHS          0x07
 161 #define CP210X_GET_MDMSTS       0x08
 162 #define CP210X_SET_XON          0x09
 163 #define CP210X_SET_XOFF         0x0A
 164 #define CP210X_SET_EVENTMASK    0x0B
 165 #define CP210X_GET_EVENTMASK    0x0C
 166 #define CP210X_SET_CHAR         0x0D
 167 #define CP210X_GET_CHARS        0x0E
 168 #define CP210X_GET_PROPS        0x0F
 169 #define CP210X_GET_COMM_STATUS  0x10
 170 #define CP210X_RESET            0x11
 171 #define CP210X_PURGE            0x12
 172 #define CP210X_SET_FLOW         0x13
 173 #define CP210X_GET_FLOW         0x14
 174 #define CP210X_EMBED_EVENTS     0x15
 175 #define CP210X_GET_EVENTSTATE   0x16
 176 #define CP210X_SET_CHARS        0x19
 177
 178 /* CP210X_IFC_ENABLE */
 179 #define UART_ENABLE             0x0001
 180 #define UART_DISABLE            0x0000
 181
 182 /* CP210X_(SET|GET)_BAUDDIV */
 183 #define BAUD_RATE_GEN_FREQ      0x384000
 184
 185 /* CP210X_(SET|GET)_LINE_CTL */
 186 #define BITS_DATA_MASK          0X0f00
 187 #define BITS_DATA_5             0X0500
 188 #define BITS_DATA_6             0X0600
 189 #define BITS_DATA_7             0X0700
 190 #define BITS_DATA_8             0X0800
 191 #define BITS_DATA_9             0X0900
 192
 193 #define BITS_PARITY_MASK        0x00f0
 194 #define BITS_PARITY_NONE        0x0000
 195 #define BITS_PARITY_ODD         0x0010
 196 #define BITS_PARITY_EVEN        0x0020
 197 #define BITS_PARITY_MARK        0x0030
 198 #define BITS_PARITY_SPACE       0x0040
 199
 200 #define BITS_STOP_MASK          0x000f
 201 #define BITS_STOP_1             0x0000
 202 #define BITS_STOP_1_5           0x0001
 203 #define BITS_STOP_2             0x0002
 204
 205 /* CP210X_SET_BREAK */
 206 #define BREAK_ON                0x0000
 207 #define BREAK_OFF               0x0001
 208
 209 /* CP210X_(SET_MHS|GET_MDMSTS) */
 210 #define CONTROL_DTR             0x0001
 211 #define CONTROL_RTS             0x0002
 212 #define CONTROL_CTS             0x0010
 213 #define CONTROL_DSR             0x0020
 214 #define CONTROL_RING            0x0040
 215 #define CONTROL_DCD             0x0080
 216 #define CONTROL_WRITE_DTR       0x0100
 217 #define CONTROL_WRITE_RTS       0x0200
 218
 219 /*
 220  * cp210x_get_config
 221  * Reads from the CP210x configuration registers
 222  * 'size' is specified in bytes.
 223  * 'data' is a pointer to a pre-allocated array of integers large
 224  * enough to hold 'size' bytes (with 4 bytes to each integer)
 225  */
 226 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 227                 unsigned int *data, int size)
 228 {
 229         struct usb_serial *serial = port->serial;
 230         __le32 *buf;
 231         int result, i, length;
 232
 233         /* Number of integers required to contain the array */
 234         length = (((size - 1) | 3) + 1)/4;
 235
 236         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 237         if (!buf) {
 238                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 239                 return -ENOMEM;
 240         }
 241
 242         /* Issue the request, attempting to read 'size' bytes */
 243         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 244                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 245                                 0, buf, size, 300);
 246
 247         /* Convert data into an array of integers */
 248         for (i = 0; i < length; i++)
 249                 data[i] = le32_to_cpu(buf[i]);
 250
 251         kfree(buf);
 252
 253         if (result != size) {
 254                 dbg("%s - Unable to send config request, "
 255                                 "request=0x%x size=%d result=%d\n",
 256                                 __func__, request, size, result);
 257                 return -EPROTO;
 258         }
 259
 260         return 0;
 261 }
 262
 263 /*
 264  * cp210x_set_config
 265  * Writes to the CP210x configuration registers
 266  * Values less than 16 bits wide are sent directly
 267  * 'size' is specified in bytes.
 268  */
 269 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 270                 unsigned int *data, int size)
 271 {
 272         struct usb_serial *serial = port->serial;
 273         __le32 *buf;
 274         int result, i, length;
 275
 276         /* Number of integers required to contain the array */
 277         length = (((size - 1) | 3) + 1)/4;
 278
 279         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 280         if (!buf) {
 281                 dev_err(&port->dev, "%s - out of memory.\n",
 282                                 __func__);
 283                 return -ENOMEM;
 284         }
 285
 286         /* Array of integers into bytes */
 287         for (i = 0; i < length; i++)
 288                 buf[i] = cpu_to_le32(data[i]);
 289
 290         if (size > 2) {
 291                 result = usb_control_msg(serial->dev,
 292                                 usb_sndctrlpipe(serial->dev, 0),
 293                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 294                                 0, buf, size, 300);
 295         } else {
 296                 result = usb_control_msg(serial->dev,
 297                                 usb_sndctrlpipe(serial->dev, 0),
 298                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 299                                 0, NULL, 0, 300);
 300         }
 301
 302         kfree(buf);
 303
 304         if ((size > 2 && result != size) || result < 0) {
 305                 dbg("%s - Unable to send request, "
 306                                 "request=0x%x size=%d result=%d\n",
 307                                 __func__, request, size, result);
 308                 return -EPROTO;
 309         }
 310
 311         /* Single data value */
 312         result = usb_control_msg(serial->dev,
 313                         usb_sndctrlpipe(serial->dev, 0),
 314                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 315                         0, NULL, 0, 300);
 316         return 0;
 317 }
 318
 319 /*
 320  * cp210x_set_config_single
 321  * Convenience function for calling cp210x_set_config on single data values
 322  * without requiring an integer pointer
 323  */
 324 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 325                 u8 request, unsigned int data)
 326 {
 327         return cp210x_set_config(port, request, &data, 2);
 328 }
 329
 330 /*
 331  * cp210x_quantise_baudrate
 332  * Quantises the baud rate as per AN205 Table 1
 333  */
 334 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 335         if      (baud <= 56)       baud = 0;
 336         else if (baud <= 300)      baud = 300;
 337         else if (baud <= 600)      baud = 600;
 338         else if (baud <= 1200)     baud = 1200;
 339         else if (baud <= 1800)     baud = 1800;
 340         else if (baud <= 2400)     baud = 2400;
 341         else if (baud <= 4000)     baud = 4000;
 342         else if (baud <= 4803)     baud = 4800;
 343         else if (baud <= 7207)     baud = 7200;
 344         else if (baud <= 9612)     baud = 9600;
 345         else if (baud <= 14428)    baud = 14400;
 346         else if (baud <= 16062)    baud = 16000;
 347         else if (baud <= 19250)    baud = 19200;
 348         else if (baud <= 28912)    baud = 28800;
 349         else if (baud <= 38601)    baud = 38400;
 350         else if (baud <= 51558)    baud = 51200;
 351         else if (baud <= 56280)    baud = 56000;
 352         else if (baud <= 58053)    baud = 57600;
 353         else if (baud <= 64111)    baud = 64000;
 354         else if (baud <= 77608)    baud = 76800;
 355         else if (baud <= 117028)   baud = 115200;
 356         else if (baud <= 129347)   baud = 128000;
 357         else if (baud <= 156868)   baud = 153600;
 358         else if (baud <= 237832)   baud = 230400;
 359         else if (baud <= 254234)   baud = 250000;
 360         else if (baud <= 273066)   baud = 256000;
 361         else if (baud <= 491520)   baud = 460800;
 362         else if (baud <= 567138)   baud = 500000;
 363         else if (baud <= 670254)   baud = 576000;
 364         else if (baud <= 1053257)  baud = 921600;
 365         else if (baud <= 1474560)  baud = 1228800;
 366         else if (baud <= 2457600)  baud = 1843200;
 367         else                       baud = 3686400;
 368         return baud;
 369 }
 370
 371 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port,
 372                                 struct file *filp)
 373 {
 374         struct usb_serial *serial = port->serial;
 375         int result;
 376
 377         dbg("%s - port %d", __func__, port->number);
 378
 379         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
 380                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 381                                 __func__);
 382                 return -EPROTO;
 383         }
 384
 385         /* Start reading from the device */
 386         usb_fill_bulk_urb(port->read_urb, serial->dev,
 387                         usb_rcvbulkpipe(serial->dev,
 388                         port->bulk_in_endpointAddress),
 389                         port->read_urb->transfer_buffer,
 390                         port->read_urb->transfer_buffer_length,
 391                         serial->type->read_bulk_callback,
 392                         port);
 393         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 394         if (result) {
 395                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 396                                 "error %d\n", __func__, result);
 397                 return result;
 398         }
 399
 400         /* Configure the termios structure */
 401         cp210x_get_termios(tty, port);
 402         return 0;
 403 }
 404
 405 static void cp210x_cleanup(struct usb_serial_port *port)
 406 {
 407         struct usb_serial *serial = port->serial;
 408
 409         dbg("%s - port %d", __func__, port->number);
 410
 411         if (serial->dev) {
 412                 /* shutdown any bulk reads that might be going on */
 413                 if (serial->num_bulk_out)
 414                         usb_kill_urb(port->write_urb);
 415                 if (serial->num_bulk_in)
 416                         usb_kill_urb(port->read_urb);
 417         }
 418 }
 419
 420 static void cp210x_close(struct usb_serial_port *port)
 421 {
 422         dbg("%s - port %d", __func__, port->number);
 423
 424         /* shutdown our urbs */
 425         dbg("%s - shutting down urbs", __func__);
 426         usb_kill_urb(port->write_urb);
 427         usb_kill_urb(port->read_urb);
 428
 429         mutex_lock(&port->serial->disc_mutex);
 430         if (!port->serial->disconnected)
 431                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 432         mutex_unlock(&port->serial->disc_mutex);
 433 }
 434
 435 /*
 436  * cp210x_get_termios
 437  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 438  * from the device, corrects any unsupported values, and configures the
 439  * termios structure to reflect the state of the device
 440  */
 441 static void cp210x_get_termios(struct tty_struct *tty,
 442         struct usb_serial_port *port)
 443 {
 444         unsigned int baud;
 445
 446         if (tty) {
 447                 cp210x_get_termios_port(tty->driver_data,
 448                         &tty->termios->c_cflag, &baud);
 449                 tty_encode_baud_rate(tty, baud, baud);
 450         }
 451
 452         else {
 453                 unsigned int cflag;
 454                 cflag = 0;
 455                 cp210x_get_termios_port(port, &cflag, &baud);
 456         }
 457 }
 458
 459 /*
 460  * cp210x_get_termios_port
 461  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 462  */
 463 static void cp210x_get_termios_port(struct usb_serial_port *port,
 464         unsigned int *cflagp, unsigned int *baudp)
 465 {
 466         unsigned int cflag, modem_ctl[4];
 467         unsigned int baud;
 468         unsigned int bits;
 469
 470         dbg("%s - port %d", __func__, port->number);
 471
 472         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 473         /* Convert to baudrate */
 474         if (baud)
 475                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 476
 477         dbg("%s - baud rate = %d", __func__, baud);
 478         *baudp = baud;
 479
 480         cflag = *cflagp;
 481
 482         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 483         cflag &= ~CSIZE;
 484         switch (bits & BITS_DATA_MASK) {
 485         case BITS_DATA_5:
 486                 dbg("%s - data bits = 5", __func__);
 487                 cflag |= CS5;
 488                 break;
 489         case BITS_DATA_6:
 490                 dbg("%s - data bits = 6", __func__);
 491                 cflag |= CS6;
 492                 break;
 493         case BITS_DATA_7:
 494                 dbg("%s - data bits = 7", __func__);
 495                 cflag |= CS7;
 496                 break;
 497         case BITS_DATA_8:
 498                 dbg("%s - data bits = 8", __func__);
 499                 cflag |= CS8;
 500                 break;
 501         case BITS_DATA_9:
 502                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 503                                                                 __func__);
 504                 cflag |= CS8;
 505                 bits &= ~BITS_DATA_MASK;
 506                 bits |= BITS_DATA_8;
 507                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 508                 break;
 509         default:
 510                 dbg("%s - Unknown number of data bits, using 8", __func__);
 511                 cflag |= CS8;
 512                 bits &= ~BITS_DATA_MASK;
 513                 bits |= BITS_DATA_8;
 514                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 515                 break;
 516         }
 517
 518         switch (bits & BITS_PARITY_MASK) {
 519         case BITS_PARITY_NONE:
 520                 dbg("%s - parity = NONE", __func__);
 521                 cflag &= ~PARENB;
 522                 break;
 523         case BITS_PARITY_ODD:
 524                 dbg("%s - parity = ODD", __func__);
 525                 cflag |= (PARENB|PARODD);
 526                 break;
 527         case BITS_PARITY_EVEN:
 528                 dbg("%s - parity = EVEN", __func__);
 529                 cflag &= ~PARODD;
 530                 cflag |= PARENB;
 531                 break;
 532         case BITS_PARITY_MARK:
 533                 dbg("%s - parity = MARK (not supported, disabling parity)",
 534                                 __func__);
 535                 cflag &= ~PARENB;
 536                 bits &= ~BITS_PARITY_MASK;
 537                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 538                 break;
 539         case BITS_PARITY_SPACE:
 540                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 541                                 __func__);
 542                 cflag &= ~PARENB;
 543                 bits &= ~BITS_PARITY_MASK;
 544                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 545                 break;
 546         default:
 547                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 548                 cflag &= ~PARENB;
 549                 bits &= ~BITS_PARITY_MASK;
 550                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 551                 break;
 552         }
 553
 554         cflag &= ~CSTOPB;
 555         switch (bits & BITS_STOP_MASK) {
 556         case BITS_STOP_1:
 557                 dbg("%s - stop bits = 1", __func__);
 558                 break;
 559         case BITS_STOP_1_5:
 560                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 561                                                                 __func__);
 562                 bits &= ~BITS_STOP_MASK;
 563                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 564                 break;
 565         case BITS_STOP_2:
 566                 dbg("%s - stop bits = 2", __func__);
 567                 cflag |= CSTOPB;
 568                 break;
 569         default:
 570                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 571                                                                 __func__);
 572                 bits &= ~BITS_STOP_MASK;
 573                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 574                 break;
 575         }
 576
 577         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 578         if (modem_ctl[0] & 0x0008) {
 579                 dbg("%s - flow control = CRTSCTS", __func__);
 580                 cflag |= CRTSCTS;
 581         } else {
 582                 dbg("%s - flow control = NONE", __func__);
 583                 cflag &= ~CRTSCTS;
 584         }
 585
 586         *cflagp = cflag;
 587 }
 588
 589 static void cp210x_set_termios(struct tty_struct *tty,
 590                 struct usb_serial_port *port, struct ktermios *old_termios)
 591 {
 592         unsigned int cflag, old_cflag;
 593         unsigned int baud = 0, bits;
 594         unsigned int modem_ctl[4];
 595
 596         dbg("%s - port %d", __func__, port->number);
 597
 598         if (!tty)
 599                 return;
 600
 601         tty->termios->c_cflag &= ~CMSPAR;
 602         cflag = tty->termios->c_cflag;
 603         old_cflag = old_termios->c_cflag;
 604         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 605
 606         /* If the baud rate is to be updated*/
 607         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 608                 dbg("%s - Setting baud rate to %d baud", __func__,
 609                                 baud);
 610                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 611                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 612                         dbg("Baud rate requested not supported by device\n");
 613                         baud = tty_termios_baud_rate(old_termios);
 614                 }
 615         }
 616         /* Report back the resulting baud rate */
 617         tty_encode_baud_rate(tty, baud, baud);
 618
 619         /* If the number of data bits is to be updated */
 620         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 621                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 622                 bits &= ~BITS_DATA_MASK;
 623                 switch (cflag & CSIZE) {
 624                 case CS5:
 625                         bits |= BITS_DATA_5;
 626                         dbg("%s - data bits = 5", __func__);
 627                         break;
 628                 case CS6:
 629                         bits |= BITS_DATA_6;
 630                         dbg("%s - data bits = 6", __func__);
 631                         break;
 632                 case CS7:
 633                         bits |= BITS_DATA_7;
 634                         dbg("%s - data bits = 7", __func__);
 635                         break;
 636                 case CS8:
 637                         bits |= BITS_DATA_8;
 638                         dbg("%s - data bits = 8", __func__);
 639                         break;
 640                 /*case CS9:
 641                         bits |= BITS_DATA_9;
 642                         dbg("%s - data bits = 9", __func__);
 643                         break;*/
 644                 default:
 645                         dbg("cp210x driver does not "
 646                                         "support the number of bits requested,"
 647                                         " using 8 bit mode\n");
 648                                 bits |= BITS_DATA_8;
 649                                 break;
 650                 }
 651                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 652                         dbg("Number of data bits requested "
 653                                         "not supported by device\n");
 654         }
 655
 656         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 657                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 658                 bits &= ~BITS_PARITY_MASK;
 659                 if (cflag & PARENB) {
 660                         if (cflag & PARODD) {
 661                                 bits |= BITS_PARITY_ODD;
 662                                 dbg("%s - parity = ODD", __func__);
 663                         } else {
 664                                 bits |= BITS_PARITY_EVEN;
 665                                 dbg("%s - parity = EVEN", __func__);
 666                         }
 667                 }
 668                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 669                         dbg("Parity mode not supported "
 670                                         "by device\n");
 671         }
 672
 673         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 674                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 675                 bits &= ~BITS_STOP_MASK;
 676                 if (cflag & CSTOPB) {
 677                         bits |= BITS_STOP_2;
 678                         dbg("%s - stop bits = 2", __func__);
 679                 } else {
 680                         bits |= BITS_STOP_1;
 681                         dbg("%s - stop bits = 1", __func__);
 682                 }
 683                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 684                         dbg("Number of stop bits requested "
 685                                         "not supported by device\n");
 686         }
 687
 688         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 689                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 690                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 691                                 __func__, modem_ctl[0], modem_ctl[1],
 692                                 modem_ctl[2], modem_ctl[3]);
 693
 694                 if (cflag & CRTSCTS) {
 695                         modem_ctl[0] &= ~0x7B;
 696                         modem_ctl[0] |= 0x09;
 697                         modem_ctl[1] = 0x80;
 698                         dbg("%s - flow control = CRTSCTS", __func__);
 699                 } else {
 700                         modem_ctl[0] &= ~0x7B;
 701                         modem_ctl[0] |= 0x01;
 702                         modem_ctl[1] |= 0x40;
 703                         dbg("%s - flow control = NONE", __func__);
 704                 }
 705
 706                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 707                                 __func__, modem_ctl[0], modem_ctl[1],
 708                                 modem_ctl[2], modem_ctl[3]);
 709                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 710         }
 711
 712 }
 713
 714 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
 715                 unsigned int set, unsigned int clear)
 716 {
 717         struct usb_serial_port *port = tty->driver_data;
 718         return cp210x_tiocmset_port(port, file, set, clear);
 719 }
 720
 721 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
 722                 unsigned int set, unsigned int clear)
 723 {
 724         unsigned int control = 0;
 725
 726         dbg("%s - port %d", __func__, port->number);
 727
 728         if (set & TIOCM_RTS) {
 729                 control |= CONTROL_RTS;
 730                 control |= CONTROL_WRITE_RTS;
 731         }
 732         if (set & TIOCM_DTR) {
 733                 control |= CONTROL_DTR;
 734                 control |= CONTROL_WRITE_DTR;
 735         }
 736         if (clear & TIOCM_RTS) {
 737                 control &= ~CONTROL_RTS;
 738                 control |= CONTROL_WRITE_RTS;
 739         }
 740         if (clear & TIOCM_DTR) {
 741                 control &= ~CONTROL_DTR;
 742                 control |= CONTROL_WRITE_DTR;
 743         }
 744
 745         dbg("%s - control = 0x%.4x", __func__, control);
 746
 747         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 748 }
 749
 750 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 751 {
 752         struct usb_serial_port *port = tty->driver_data;
 753         unsigned int control;
 754         int result;
 755
 756         dbg("%s - port %d", __func__, port->number);
 757
 758         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 759
 760         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 761                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 762                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 763                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 764                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 765                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 766
 767         dbg("%s - control = 0x%.2x", __func__, control);
 768
 769         return result;
 770 }
 771
 772 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 773 {
 774         struct usb_serial_port *port = tty->driver_data;
 775         unsigned int state;
 776
 777         dbg("%s - port %d", __func__, port->number);
 778         if (break_state == 0)
 779                 state = BREAK_OFF;
 780         else
 781                 state = BREAK_ON;
 782         dbg("%s - turning break %s", __func__,
 783                         state == BREAK_OFF ? "off" : "on");
 784         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 785 }
 786
 787 static int cp210x_startup(struct usb_serial *serial)
 788 {
 789         /* cp210x buffers behave strangely unless device is reset */
 790         usb_reset_device(serial->dev);
 791         return 0;
 792 }
 793
 794 static void cp210x_disconnect(struct usb_serial *serial)
 795 {
 796         int i;
 797
 798         dbg("%s", __func__);
 799
 800         /* Stop reads and writes on all ports */
 801         for (i = 0; i < serial->num_ports; ++i)
 802                 cp210x_cleanup(serial->port[i]);
 803 }
 804
 805 static int __init cp210x_init(void)
 806 {
 807         int retval;
 808
 809         retval = usb_serial_register(&cp210x_device);
 810         if (retval)
 811                 return retval; /* Failed to register */
 812
 813         retval = usb_register(&cp210x_driver);
 814         if (retval) {
 815                 /* Failed to register */
 816                 usb_serial_deregister(&cp210x_device);
 817                 return retval;
 818         }
 819
 820         /* Success */
 821         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 822                DRIVER_DESC "\n");
 823         return 0;
 824 }
 825
 826 static void __exit cp210x_exit(void)
 827 {
 828         usb_deregister(&cp210x_driver);
 829         usb_serial_deregister(&cp210x_device);
 830 }
 831
 832 module_init(cp210x_init);
 833 module_exit(cp210x_exit);
 834
 835 MODULE_DESCRIPTION(DRIVER_DESC);
 836 MODULE_VERSION(DRIVER_VERSION);
 837 MODULE_LICENSE("GPL");
 838
 839 module_param(debug, bool, S_IRUGO | S_IWUSR);
 840 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");