SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 *tty, struct usb_serial_port *);
  37 static void cp210x_close(struct usb_serial_port *);
  38 static void cp210x_get_termios(struct tty_struct *,
  39         struct usb_serial_port *port);
  40 static void cp210x_get_termios_port(struct usb_serial_port *port,
  41         unsigned int *cflagp, unsigned int *baudp);
  42 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  43                                                         struct ktermios*);
  44 static int cp210x_tiocmget(struct tty_struct *, struct file *);
  45 static int cp210x_tiocmset(struct tty_struct *, struct file *,
  46                 unsigned int, unsigned int);
  47 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
  48                 unsigned int, unsigned int);
  49 static void cp210x_break_ctl(struct tty_struct *, int);
  50 static int cp210x_startup(struct usb_serial *);
  51 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  52 static int cp210x_carrier_raised(struct usb_serial_port *p);
  53
  54 static int debug;
  55
  56 static const struct usb_device_id id_table[] = {
  57         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  58         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  59         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  60         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  61         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  62         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  63         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  64         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  65         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  66         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  67         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  68         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  69         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  70         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  71         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  72         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  73         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  74         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  75         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  76         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  77         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  78         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  79         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  80         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  81         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  82         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  83         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  84         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  85         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  86         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  87         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  88         { USB_DEVICE(0x10C4, 0x8149) }, /* West Mountain Radio Computerized Battery Analyzer */
  89         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  90         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  91         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  92         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  93         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  94         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  95         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  96         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
  97         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  98         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  99         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 100         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 101         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 102         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 103         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 104         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
 105         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesys ETRX2USB */
 106         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 107         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 108         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 109         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 110         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 111         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 112         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 113         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 114         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 115         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 116         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 117         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 118         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 119         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 120         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 121         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 122         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 123         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 124         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 125         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 126         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 127         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 128         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 129         { } /* Terminating Entry */
 130 };
 131
 132 MODULE_DEVICE_TABLE(usb, id_table);
 133
 134 static struct usb_driver cp210x_driver = {
 135         .name           = "cp210x",
 136         .probe          = usb_serial_probe,
 137         .disconnect     = usb_serial_disconnect,
 138         .id_table       = id_table,
 139         .no_dynamic_id  =       1,
 140 };
 141
 142 static struct usb_serial_driver cp210x_device = {
 143         .driver = {
 144                 .owner =        THIS_MODULE,
 145                 .name =         "cp210x",
 146         },
 147         .usb_driver             = &cp210x_driver,
 148         .id_table               = id_table,
 149         .num_ports              = 1,
 150         .bulk_in_size           = 256,
 151         .bulk_out_size          = 256,
 152         .open                   = cp210x_open,
 153         .close                  = cp210x_close,
 154         .break_ctl              = cp210x_break_ctl,
 155         .set_termios            = cp210x_set_termios,
 156         .tiocmget               = cp210x_tiocmget,
 157         .tiocmset               = cp210x_tiocmset,
 158         .attach                 = cp210x_startup,
 159         .dtr_rts                = cp210x_dtr_rts,
 160         .carrier_raised         = cp210x_carrier_raised
 161 };
 162
 163 /* Config request types */
 164 #define REQTYPE_HOST_TO_DEVICE  0x41
 165 #define REQTYPE_DEVICE_TO_HOST  0xc1
 166
 167 /* Config request codes */
 168 #define CP210X_IFC_ENABLE       0x00
 169 #define CP210X_SET_BAUDDIV      0x01
 170 #define CP210X_GET_BAUDDIV      0x02
 171 #define CP210X_SET_LINE_CTL     0x03
 172 #define CP210X_GET_LINE_CTL     0x04
 173 #define CP210X_SET_BREAK        0x05
 174 #define CP210X_IMM_CHAR         0x06
 175 #define CP210X_SET_MHS          0x07
 176 #define CP210X_GET_MDMSTS       0x08
 177 #define CP210X_SET_XON          0x09
 178 #define CP210X_SET_XOFF         0x0A
 179 #define CP210X_SET_EVENTMASK    0x0B
 180 #define CP210X_GET_EVENTMASK    0x0C
 181 #define CP210X_SET_CHAR         0x0D
 182 #define CP210X_GET_CHARS        0x0E
 183 #define CP210X_GET_PROPS        0x0F
 184 #define CP210X_GET_COMM_STATUS  0x10
 185 #define CP210X_RESET            0x11
 186 #define CP210X_PURGE            0x12
 187 #define CP210X_SET_FLOW         0x13
 188 #define CP210X_GET_FLOW         0x14
 189 #define CP210X_EMBED_EVENTS     0x15
 190 #define CP210X_GET_EVENTSTATE   0x16
 191 #define CP210X_SET_CHARS        0x19
 192
 193 /* CP210X_IFC_ENABLE */
 194 #define UART_ENABLE             0x0001
 195 #define UART_DISABLE            0x0000
 196
 197 /* CP210X_(SET|GET)_BAUDDIV */
 198 #define BAUD_RATE_GEN_FREQ      0x384000
 199
 200 /* CP210X_(SET|GET)_LINE_CTL */
 201 #define BITS_DATA_MASK          0X0f00
 202 #define BITS_DATA_5             0X0500
 203 #define BITS_DATA_6             0X0600
 204 #define BITS_DATA_7             0X0700
 205 #define BITS_DATA_8             0X0800
 206 #define BITS_DATA_9             0X0900
 207
 208 #define BITS_PARITY_MASK        0x00f0
 209 #define BITS_PARITY_NONE        0x0000
 210 #define BITS_PARITY_ODD         0x0010
 211 #define BITS_PARITY_EVEN        0x0020
 212 #define BITS_PARITY_MARK        0x0030
 213 #define BITS_PARITY_SPACE       0x0040
 214
 215 #define BITS_STOP_MASK          0x000f
 216 #define BITS_STOP_1             0x0000
 217 #define BITS_STOP_1_5           0x0001
 218 #define BITS_STOP_2             0x0002
 219
 220 /* CP210X_SET_BREAK */
 221 #define BREAK_ON                0x0000
 222 #define BREAK_OFF               0x0001
 223
 224 /* CP210X_(SET_MHS|GET_MDMSTS) */
 225 #define CONTROL_DTR             0x0001
 226 #define CONTROL_RTS             0x0002
 227 #define CONTROL_CTS             0x0010
 228 #define CONTROL_DSR             0x0020
 229 #define CONTROL_RING            0x0040
 230 #define CONTROL_DCD             0x0080
 231 #define CONTROL_WRITE_DTR       0x0100
 232 #define CONTROL_WRITE_RTS       0x0200
 233
 234 /*
 235  * cp210x_get_config
 236  * Reads from the CP210x configuration registers
 237  * 'size' is specified in bytes.
 238  * 'data' is a pointer to a pre-allocated array of integers large
 239  * enough to hold 'size' bytes (with 4 bytes to each integer)
 240  */
 241 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 242                 unsigned int *data, int size)
 243 {
 244         struct usb_serial *serial = port->serial;
 245         __le32 *buf;
 246         int result, i, length;
 247
 248         /* Number of integers required to contain the array */
 249         length = (((size - 1) | 3) + 1)/4;
 250
 251         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 252         if (!buf) {
 253                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 254                 return -ENOMEM;
 255         }
 256
 257         /* Issue the request, attempting to read 'size' bytes */
 258         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 259                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 260                                 0, buf, size, 300);
 261
 262         /* Convert data into an array of integers */
 263         for (i = 0; i < length; i++)
 264                 data[i] = le32_to_cpu(buf[i]);
 265
 266         kfree(buf);
 267
 268         if (result != size) {
 269                 dbg("%s - Unable to send config request, "
 270                                 "request=0x%x size=%d result=%d\n",
 271                                 __func__, request, size, result);
 272                 return -EPROTO;
 273         }
 274
 275         return 0;
 276 }
 277
 278 /*
 279  * cp210x_set_config
 280  * Writes to the CP210x configuration registers
 281  * Values less than 16 bits wide are sent directly
 282  * 'size' is specified in bytes.
 283  */
 284 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 285                 unsigned int *data, int size)
 286 {
 287         struct usb_serial *serial = port->serial;
 288         __le32 *buf;
 289         int result, i, length;
 290
 291         /* Number of integers required to contain the array */
 292         length = (((size - 1) | 3) + 1)/4;
 293
 294         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 295         if (!buf) {
 296                 dev_err(&port->dev, "%s - out of memory.\n",
 297                                 __func__);
 298                 return -ENOMEM;
 299         }
 300
 301         /* Array of integers into bytes */
 302         for (i = 0; i < length; i++)
 303                 buf[i] = cpu_to_le32(data[i]);
 304
 305         if (size > 2) {
 306                 result = usb_control_msg(serial->dev,
 307                                 usb_sndctrlpipe(serial->dev, 0),
 308                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 309                                 0, buf, size, 300);
 310         } else {
 311                 result = usb_control_msg(serial->dev,
 312                                 usb_sndctrlpipe(serial->dev, 0),
 313                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 314                                 0, NULL, 0, 300);
 315         }
 316
 317         kfree(buf);
 318
 319         if ((size > 2 && result != size) || result < 0) {
 320                 dbg("%s - Unable to send request, "
 321                                 "request=0x%x size=%d result=%d\n",
 322                                 __func__, request, size, result);
 323                 return -EPROTO;
 324         }
 325
 326         return 0;
 327 }
 328
 329 /*
 330  * cp210x_set_config_single
 331  * Convenience function for calling cp210x_set_config on single data values
 332  * without requiring an integer pointer
 333  */
 334 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 335                 u8 request, unsigned int data)
 336 {
 337         return cp210x_set_config(port, request, &data, 2);
 338 }
 339
 340 /*
 341  * cp210x_quantise_baudrate
 342  * Quantises the baud rate as per AN205 Table 1
 343  */
 344 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 345         if      (baud <= 56)       baud = 0;
 346         else if (baud <= 300)      baud = 300;
 347         else if (baud <= 600)      baud = 600;
 348         else if (baud <= 1200)     baud = 1200;
 349         else if (baud <= 1800)     baud = 1800;
 350         else if (baud <= 2400)     baud = 2400;
 351         else if (baud <= 4000)     baud = 4000;
 352         else if (baud <= 4803)     baud = 4800;
 353         else if (baud <= 7207)     baud = 7200;
 354         else if (baud <= 9612)     baud = 9600;
 355         else if (baud <= 14428)    baud = 14400;
 356         else if (baud <= 16062)    baud = 16000;
 357         else if (baud <= 19250)    baud = 19200;
 358         else if (baud <= 28912)    baud = 28800;
 359         else if (baud <= 38601)    baud = 38400;
 360         else if (baud <= 51558)    baud = 51200;
 361         else if (baud <= 56280)    baud = 56000;
 362         else if (baud <= 58053)    baud = 57600;
 363         else if (baud <= 64111)    baud = 64000;
 364         else if (baud <= 77608)    baud = 76800;
 365         else if (baud <= 117028)   baud = 115200;
 366         else if (baud <= 129347)   baud = 128000;
 367         else if (baud <= 156868)   baud = 153600;
 368         else if (baud <= 237832)   baud = 230400;
 369         else if (baud <= 254234)   baud = 250000;
 370         else if (baud <= 273066)   baud = 256000;
 371         else if (baud <= 491520)   baud = 460800;
 372         else if (baud <= 567138)   baud = 500000;
 373         else if (baud <= 670254)   baud = 576000;
 374         else if (baud <= 1053257)  baud = 921600;
 375         else if (baud <= 1474560)  baud = 1228800;
 376         else if (baud <= 2457600)  baud = 1843200;
 377         else                       baud = 3686400;
 378         return baud;
 379 }
 380
 381 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 382 {
 383         int result;
 384
 385         dbg("%s - port %d", __func__, port->number);
 386
 387         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
 388                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 389                                 __func__);
 390                 return -EPROTO;
 391         }
 392
 393         result = usb_serial_generic_open(tty, port);
 394         if (result)
 395                 return result;
 396
 397         /* Configure the termios structure */
 398         cp210x_get_termios(tty, port);
 399         return 0;
 400 }
 401
 402 static void cp210x_close(struct usb_serial_port *port)
 403 {
 404         dbg("%s - port %d", __func__, port->number);
 405
 406         usb_serial_generic_close(port);
 407
 408         mutex_lock(&port->serial->disc_mutex);
 409         if (!port->serial->disconnected)
 410                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 411         mutex_unlock(&port->serial->disc_mutex);
 412 }
 413
 414 /*
 415  * cp210x_get_termios
 416  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 417  * from the device, corrects any unsupported values, and configures the
 418  * termios structure to reflect the state of the device
 419  */
 420 static void cp210x_get_termios(struct tty_struct *tty,
 421         struct usb_serial_port *port)
 422 {
 423         unsigned int baud;
 424
 425         if (tty) {
 426                 cp210x_get_termios_port(tty->driver_data,
 427                         &tty->termios->c_cflag, &baud);
 428                 tty_encode_baud_rate(tty, baud, baud);
 429         }
 430
 431         else {
 432                 unsigned int cflag;
 433                 cflag = 0;
 434                 cp210x_get_termios_port(port, &cflag, &baud);
 435         }
 436 }
 437
 438 /*
 439  * cp210x_get_termios_port
 440  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 441  */
 442 static void cp210x_get_termios_port(struct usb_serial_port *port,
 443         unsigned int *cflagp, unsigned int *baudp)
 444 {
 445         unsigned int cflag, modem_ctl[4];
 446         unsigned int baud;
 447         unsigned int bits;
 448
 449         dbg("%s - port %d", __func__, port->number);
 450
 451         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 452         /* Convert to baudrate */
 453         if (baud)
 454                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 455
 456         dbg("%s - baud rate = %d", __func__, baud);
 457         *baudp = baud;
 458
 459         cflag = *cflagp;
 460
 461         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 462         cflag &= ~CSIZE;
 463         switch (bits & BITS_DATA_MASK) {
 464         case BITS_DATA_5:
 465                 dbg("%s - data bits = 5", __func__);
 466                 cflag |= CS5;
 467                 break;
 468         case BITS_DATA_6:
 469                 dbg("%s - data bits = 6", __func__);
 470                 cflag |= CS6;
 471                 break;
 472         case BITS_DATA_7:
 473                 dbg("%s - data bits = 7", __func__);
 474                 cflag |= CS7;
 475                 break;
 476         case BITS_DATA_8:
 477                 dbg("%s - data bits = 8", __func__);
 478                 cflag |= CS8;
 479                 break;
 480         case BITS_DATA_9:
 481                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 482                                                                 __func__);
 483                 cflag |= CS8;
 484                 bits &= ~BITS_DATA_MASK;
 485                 bits |= BITS_DATA_8;
 486                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 487                 break;
 488         default:
 489                 dbg("%s - Unknown number of data bits, using 8", __func__);
 490                 cflag |= CS8;
 491                 bits &= ~BITS_DATA_MASK;
 492                 bits |= BITS_DATA_8;
 493                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 494                 break;
 495         }
 496
 497         switch (bits & BITS_PARITY_MASK) {
 498         case BITS_PARITY_NONE:
 499                 dbg("%s - parity = NONE", __func__);
 500                 cflag &= ~PARENB;
 501                 break;
 502         case BITS_PARITY_ODD:
 503                 dbg("%s - parity = ODD", __func__);
 504                 cflag |= (PARENB|PARODD);
 505                 break;
 506         case BITS_PARITY_EVEN:
 507                 dbg("%s - parity = EVEN", __func__);
 508                 cflag &= ~PARODD;
 509                 cflag |= PARENB;
 510                 break;
 511         case BITS_PARITY_MARK:
 512                 dbg("%s - parity = MARK (not supported, disabling parity)",
 513                                 __func__);
 514                 cflag &= ~PARENB;
 515                 bits &= ~BITS_PARITY_MASK;
 516                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 517                 break;
 518         case BITS_PARITY_SPACE:
 519                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 520                                 __func__);
 521                 cflag &= ~PARENB;
 522                 bits &= ~BITS_PARITY_MASK;
 523                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 524                 break;
 525         default:
 526                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 527                 cflag &= ~PARENB;
 528                 bits &= ~BITS_PARITY_MASK;
 529                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 530                 break;
 531         }
 532
 533         cflag &= ~CSTOPB;
 534         switch (bits & BITS_STOP_MASK) {
 535         case BITS_STOP_1:
 536                 dbg("%s - stop bits = 1", __func__);
 537                 break;
 538         case BITS_STOP_1_5:
 539                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 540                                                                 __func__);
 541                 bits &= ~BITS_STOP_MASK;
 542                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 543                 break;
 544         case BITS_STOP_2:
 545                 dbg("%s - stop bits = 2", __func__);
 546                 cflag |= CSTOPB;
 547                 break;
 548         default:
 549                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 550                                                                 __func__);
 551                 bits &= ~BITS_STOP_MASK;
 552                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 553                 break;
 554         }
 555
 556         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 557         if (modem_ctl[0] & 0x0008) {
 558                 dbg("%s - flow control = CRTSCTS", __func__);
 559                 cflag |= CRTSCTS;
 560         } else {
 561                 dbg("%s - flow control = NONE", __func__);
 562                 cflag &= ~CRTSCTS;
 563         }
 564
 565         *cflagp = cflag;
 566 }
 567
 568 static void cp210x_set_termios(struct tty_struct *tty,
 569                 struct usb_serial_port *port, struct ktermios *old_termios)
 570 {
 571         unsigned int cflag, old_cflag;
 572         unsigned int baud = 0, bits;
 573         unsigned int modem_ctl[4];
 574
 575         dbg("%s - port %d", __func__, port->number);
 576
 577         if (!tty)
 578                 return;
 579
 580         tty->termios->c_cflag &= ~CMSPAR;
 581         cflag = tty->termios->c_cflag;
 582         old_cflag = old_termios->c_cflag;
 583         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 584
 585         /* If the baud rate is to be updated*/
 586         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 587                 dbg("%s - Setting baud rate to %d baud", __func__,
 588                                 baud);
 589                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 590                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 591                         dbg("Baud rate requested not supported by device");
 592                         baud = tty_termios_baud_rate(old_termios);
 593                 }
 594         }
 595         /* Report back the resulting baud rate */
 596         tty_encode_baud_rate(tty, baud, baud);
 597
 598         /* If the number of data bits is to be updated */
 599         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 600                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 601                 bits &= ~BITS_DATA_MASK;
 602                 switch (cflag & CSIZE) {
 603                 case CS5:
 604                         bits |= BITS_DATA_5;
 605                         dbg("%s - data bits = 5", __func__);
 606                         break;
 607                 case CS6:
 608                         bits |= BITS_DATA_6;
 609                         dbg("%s - data bits = 6", __func__);
 610                         break;
 611                 case CS7:
 612                         bits |= BITS_DATA_7;
 613                         dbg("%s - data bits = 7", __func__);
 614                         break;
 615                 case CS8:
 616                         bits |= BITS_DATA_8;
 617                         dbg("%s - data bits = 8", __func__);
 618                         break;
 619                 /*case CS9:
 620                         bits |= BITS_DATA_9;
 621                         dbg("%s - data bits = 9", __func__);
 622                         break;*/
 623                 default:
 624                         dbg("cp210x driver does not "
 625                                         "support the number of bits requested,"
 626                                         " using 8 bit mode\n");
 627                                 bits |= BITS_DATA_8;
 628                                 break;
 629                 }
 630                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 631                         dbg("Number of data bits requested "
 632                                         "not supported by device\n");
 633         }
 634
 635         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 636                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 637                 bits &= ~BITS_PARITY_MASK;
 638                 if (cflag & PARENB) {
 639                         if (cflag & PARODD) {
 640                                 bits |= BITS_PARITY_ODD;
 641                                 dbg("%s - parity = ODD", __func__);
 642                         } else {
 643                                 bits |= BITS_PARITY_EVEN;
 644                                 dbg("%s - parity = EVEN", __func__);
 645                         }
 646                 }
 647                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 648                         dbg("Parity mode not supported "
 649                                         "by device\n");
 650         }
 651
 652         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 653                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 654                 bits &= ~BITS_STOP_MASK;
 655                 if (cflag & CSTOPB) {
 656                         bits |= BITS_STOP_2;
 657                         dbg("%s - stop bits = 2", __func__);
 658                 } else {
 659                         bits |= BITS_STOP_1;
 660                         dbg("%s - stop bits = 1", __func__);
 661                 }
 662                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 663                         dbg("Number of stop bits requested "
 664                                         "not supported by device\n");
 665         }
 666
 667         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 668                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 669                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 670                                 __func__, modem_ctl[0], modem_ctl[1],
 671                                 modem_ctl[2], modem_ctl[3]);
 672
 673                 if (cflag & CRTSCTS) {
 674                         modem_ctl[0] &= ~0x7B;
 675                         modem_ctl[0] |= 0x09;
 676                         modem_ctl[1] = 0x80;
 677                         dbg("%s - flow control = CRTSCTS", __func__);
 678                 } else {
 679                         modem_ctl[0] &= ~0x7B;
 680                         modem_ctl[0] |= 0x01;
 681                         modem_ctl[1] |= 0x40;
 682                         dbg("%s - flow control = NONE", __func__);
 683                 }
 684
 685                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 686                                 __func__, modem_ctl[0], modem_ctl[1],
 687                                 modem_ctl[2], modem_ctl[3]);
 688                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 689         }
 690
 691 }
 692
 693 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
 694                 unsigned int set, unsigned int clear)
 695 {
 696         struct usb_serial_port *port = tty->driver_data;
 697         return cp210x_tiocmset_port(port, file, set, clear);
 698 }
 699
 700 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
 701                 unsigned int set, unsigned int clear)
 702 {
 703         unsigned int control = 0;
 704
 705         dbg("%s - port %d", __func__, port->number);
 706
 707         if (set & TIOCM_RTS) {
 708                 control |= CONTROL_RTS;
 709                 control |= CONTROL_WRITE_RTS;
 710         }
 711         if (set & TIOCM_DTR) {
 712                 control |= CONTROL_DTR;
 713                 control |= CONTROL_WRITE_DTR;
 714         }
 715         if (clear & TIOCM_RTS) {
 716                 control &= ~CONTROL_RTS;
 717                 control |= CONTROL_WRITE_RTS;
 718         }
 719         if (clear & TIOCM_DTR) {
 720                 control &= ~CONTROL_DTR;
 721                 control |= CONTROL_WRITE_DTR;
 722         }
 723
 724         dbg("%s - control = 0x%.4x", __func__, control);
 725
 726         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 727 }
 728
 729 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 730 {
 731         if (on)
 732                 cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
 733         else
 734                 cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
 735 }
 736
 737 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 738 {
 739         struct usb_serial_port *port = tty->driver_data;
 740         unsigned int control;
 741         int result;
 742
 743         dbg("%s - port %d", __func__, port->number);
 744
 745         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 746
 747         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 748                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 749                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 750                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 751                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 752                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 753
 754         dbg("%s - control = 0x%.2x", __func__, control);
 755
 756         return result;
 757 }
 758
 759 static int cp210x_carrier_raised(struct usb_serial_port *p)
 760 {
 761         unsigned int control;
 762         cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
 763         if (control & CONTROL_DCD)
 764                 return 1;
 765         return 0;
 766 }
 767
 768 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 769 {
 770         struct usb_serial_port *port = tty->driver_data;
 771         unsigned int state;
 772
 773         dbg("%s - port %d", __func__, port->number);
 774         if (break_state == 0)
 775                 state = BREAK_OFF;
 776         else
 777                 state = BREAK_ON;
 778         dbg("%s - turning break %s", __func__,
 779                         state == BREAK_OFF ? "off" : "on");
 780         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 781 }
 782
 783 static int cp210x_startup(struct usb_serial *serial)
 784 {
 785         /* cp210x buffers behave strangely unless device is reset */
 786         usb_reset_device(serial->dev);
 787         return 0;
 788 }
 789
 790 static int __init cp210x_init(void)
 791 {
 792         int retval;
 793
 794         retval = usb_serial_register(&cp210x_device);
 795         if (retval)
 796                 return retval; /* Failed to register */
 797
 798         retval = usb_register(&cp210x_driver);
 799         if (retval) {
 800                 /* Failed to register */
 801                 usb_serial_deregister(&cp210x_device);
 802                 return retval;
 803         }
 804
 805         /* Success */
 806         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 807                DRIVER_DESC "\n");
 808         return 0;
 809 }
 810
 811 static void __exit cp210x_exit(void)
 812 {
 813         usb_deregister(&cp210x_driver);
 814         usb_serial_deregister(&cp210x_device);
 815 }
 816
 817 module_init(cp210x_init);
 818 module_exit(cp210x_exit);
 819
 820 MODULE_DESCRIPTION(DRIVER_DESC);
 821 MODULE_VERSION(DRIVER_VERSION);
 822 MODULE_LICENSE("GPL");
 823
 824 module_param(debug, bool, S_IRUGO | S_IWUSR);
 825 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");