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_cleanup(struct usb_serial_port *);
  38 static void cp210x_close(struct usb_serial_port *);
  39 static void cp210x_get_termios(struct tty_struct *,
  40         struct usb_serial_port *port);
  41 static void cp210x_get_termios_port(struct usb_serial_port *port,
  42         unsigned int *cflagp, unsigned int *baudp);
  43 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *,
  44                                                         struct ktermios*);
  45 static int cp210x_tiocmget(struct tty_struct *, struct file *);
  46 static int cp210x_tiocmset(struct tty_struct *, struct file *,
  47                 unsigned int, unsigned int);
  48 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
  49                 unsigned int, unsigned int);
  50 static void cp210x_break_ctl(struct tty_struct *, int);
  51 static int cp210x_startup(struct usb_serial *);
  52 static void cp210x_disconnect(struct usb_serial *);
  53 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  54 static int cp210x_carrier_raised(struct usb_serial_port *p);
  55
  56 static int debug;
  57
  58 static const 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(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  62         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  63         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  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, 0x8053) }, /* Enfora EDG1228 */
  76         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  77         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  78         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  79         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  80         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  81         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  82         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  83         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  84         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  85         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  86         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  87         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  88         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  89         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  90         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  91         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  92         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  93         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  94         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
  95         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
  96         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  97         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
  98         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
  99         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesys ETRX2USB */
 100         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 101         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 102         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 103         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 104         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 105         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 106         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 107         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 108         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 109         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 110         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 111         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 112         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 113         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 114         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 115         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 116         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 117         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 118         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 119         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 120         { } /* Terminating Entry */
 121 };
 122
 123 MODULE_DEVICE_TABLE(usb, id_table);
 124
 125 static struct usb_driver cp210x_driver = {
 126         .name           = "cp210x",
 127         .probe          = usb_serial_probe,
 128         .disconnect     = usb_serial_disconnect,
 129         .id_table       = id_table,
 130         .no_dynamic_id  =       1,
 131 };
 132
 133 static struct usb_serial_driver cp210x_device = {
 134         .driver = {
 135                 .owner =        THIS_MODULE,
 136                 .name =         "cp210x",
 137         },
 138         .usb_driver             = &cp210x_driver,
 139         .id_table               = id_table,
 140         .num_ports              = 1,
 141         .bulk_in_size           = 256,
 142         .bulk_out_size          = 256,
 143         .open                   = cp210x_open,
 144         .close                  = cp210x_close,
 145         .break_ctl              = cp210x_break_ctl,
 146         .set_termios            = cp210x_set_termios,
 147         .tiocmget               = cp210x_tiocmget,
 148         .tiocmset               = cp210x_tiocmset,
 149         .attach                 = cp210x_startup,
 150         .disconnect             = cp210x_disconnect,
 151         .dtr_rts                = cp210x_dtr_rts,
 152         .carrier_raised         = cp210x_carrier_raised
 153 };
 154
 155 /* Config request types */
 156 #define REQTYPE_HOST_TO_DEVICE  0x41
 157 #define REQTYPE_DEVICE_TO_HOST  0xc1
 158
 159 /* Config request codes */
 160 #define CP210X_IFC_ENABLE       0x00
 161 #define CP210X_SET_BAUDDIV      0x01
 162 #define CP210X_GET_BAUDDIV      0x02
 163 #define CP210X_SET_LINE_CTL     0x03
 164 #define CP210X_GET_LINE_CTL     0x04
 165 #define CP210X_SET_BREAK        0x05
 166 #define CP210X_IMM_CHAR         0x06
 167 #define CP210X_SET_MHS          0x07
 168 #define CP210X_GET_MDMSTS       0x08
 169 #define CP210X_SET_XON          0x09
 170 #define CP210X_SET_XOFF         0x0A
 171 #define CP210X_SET_EVENTMASK    0x0B
 172 #define CP210X_GET_EVENTMASK    0x0C
 173 #define CP210X_SET_CHAR         0x0D
 174 #define CP210X_GET_CHARS        0x0E
 175 #define CP210X_GET_PROPS        0x0F
 176 #define CP210X_GET_COMM_STATUS  0x10
 177 #define CP210X_RESET            0x11
 178 #define CP210X_PURGE            0x12
 179 #define CP210X_SET_FLOW         0x13
 180 #define CP210X_GET_FLOW         0x14
 181 #define CP210X_EMBED_EVENTS     0x15
 182 #define CP210X_GET_EVENTSTATE   0x16
 183 #define CP210X_SET_CHARS        0x19
 184
 185 /* CP210X_IFC_ENABLE */
 186 #define UART_ENABLE             0x0001
 187 #define UART_DISABLE            0x0000
 188
 189 /* CP210X_(SET|GET)_BAUDDIV */
 190 #define BAUD_RATE_GEN_FREQ      0x384000
 191
 192 /* CP210X_(SET|GET)_LINE_CTL */
 193 #define BITS_DATA_MASK          0X0f00
 194 #define BITS_DATA_5             0X0500
 195 #define BITS_DATA_6             0X0600
 196 #define BITS_DATA_7             0X0700
 197 #define BITS_DATA_8             0X0800
 198 #define BITS_DATA_9             0X0900
 199
 200 #define BITS_PARITY_MASK        0x00f0
 201 #define BITS_PARITY_NONE        0x0000
 202 #define BITS_PARITY_ODD         0x0010
 203 #define BITS_PARITY_EVEN        0x0020
 204 #define BITS_PARITY_MARK        0x0030
 205 #define BITS_PARITY_SPACE       0x0040
 206
 207 #define BITS_STOP_MASK          0x000f
 208 #define BITS_STOP_1             0x0000
 209 #define BITS_STOP_1_5           0x0001
 210 #define BITS_STOP_2             0x0002
 211
 212 /* CP210X_SET_BREAK */
 213 #define BREAK_ON                0x0000
 214 #define BREAK_OFF               0x0001
 215
 216 /* CP210X_(SET_MHS|GET_MDMSTS) */
 217 #define CONTROL_DTR             0x0001
 218 #define CONTROL_RTS             0x0002
 219 #define CONTROL_CTS             0x0010
 220 #define CONTROL_DSR             0x0020
 221 #define CONTROL_RING            0x0040
 222 #define CONTROL_DCD             0x0080
 223 #define CONTROL_WRITE_DTR       0x0100
 224 #define CONTROL_WRITE_RTS       0x0200
 225
 226 /*
 227  * cp210x_get_config
 228  * Reads from the CP210x configuration registers
 229  * 'size' is specified in bytes.
 230  * 'data' is a pointer to a pre-allocated array of integers large
 231  * enough to hold 'size' bytes (with 4 bytes to each integer)
 232  */
 233 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 234                 unsigned int *data, int size)
 235 {
 236         struct usb_serial *serial = port->serial;
 237         __le32 *buf;
 238         int result, i, length;
 239
 240         /* Number of integers required to contain the array */
 241         length = (((size - 1) | 3) + 1)/4;
 242
 243         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 244         if (!buf) {
 245                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 246                 return -ENOMEM;
 247         }
 248
 249         /* Issue the request, attempting to read 'size' bytes */
 250         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 251                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 252                                 0, buf, size, 300);
 253
 254         /* Convert data into an array of integers */
 255         for (i = 0; i < length; i++)
 256                 data[i] = le32_to_cpu(buf[i]);
 257
 258         kfree(buf);
 259
 260         if (result != size) {
 261                 dbg("%s - Unable to send config request, "
 262                                 "request=0x%x size=%d result=%d\n",
 263                                 __func__, request, size, result);
 264                 return -EPROTO;
 265         }
 266
 267         return 0;
 268 }
 269
 270 /*
 271  * cp210x_set_config
 272  * Writes to the CP210x configuration registers
 273  * Values less than 16 bits wide are sent directly
 274  * 'size' is specified in bytes.
 275  */
 276 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 277                 unsigned int *data, int size)
 278 {
 279         struct usb_serial *serial = port->serial;
 280         __le32 *buf;
 281         int result, i, length;
 282
 283         /* Number of integers required to contain the array */
 284         length = (((size - 1) | 3) + 1)/4;
 285
 286         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 287         if (!buf) {
 288                 dev_err(&port->dev, "%s - out of memory.\n",
 289                                 __func__);
 290                 return -ENOMEM;
 291         }
 292
 293         /* Array of integers into bytes */
 294         for (i = 0; i < length; i++)
 295                 buf[i] = cpu_to_le32(data[i]);
 296
 297         if (size > 2) {
 298                 result = usb_control_msg(serial->dev,
 299                                 usb_sndctrlpipe(serial->dev, 0),
 300                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 301                                 0, buf, size, 300);
 302         } else {
 303                 result = usb_control_msg(serial->dev,
 304                                 usb_sndctrlpipe(serial->dev, 0),
 305                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 306                                 0, NULL, 0, 300);
 307         }
 308
 309         kfree(buf);
 310
 311         if ((size > 2 && result != size) || result < 0) {
 312                 dbg("%s - Unable to send request, "
 313                                 "request=0x%x size=%d result=%d\n",
 314                                 __func__, request, size, result);
 315                 return -EPROTO;
 316         }
 317
 318         return 0;
 319 }
 320
 321 /*
 322  * cp210x_set_config_single
 323  * Convenience function for calling cp210x_set_config on single data values
 324  * without requiring an integer pointer
 325  */
 326 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 327                 u8 request, unsigned int data)
 328 {
 329         return cp210x_set_config(port, request, &data, 2);
 330 }
 331
 332 /*
 333  * cp210x_quantise_baudrate
 334  * Quantises the baud rate as per AN205 Table 1
 335  */
 336 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 337         if      (baud <= 56)       baud = 0;
 338         else if (baud <= 300)      baud = 300;
 339         else if (baud <= 600)      baud = 600;
 340         else if (baud <= 1200)     baud = 1200;
 341         else if (baud <= 1800)     baud = 1800;
 342         else if (baud <= 2400)     baud = 2400;
 343         else if (baud <= 4000)     baud = 4000;
 344         else if (baud <= 4803)     baud = 4800;
 345         else if (baud <= 7207)     baud = 7200;
 346         else if (baud <= 9612)     baud = 9600;
 347         else if (baud <= 14428)    baud = 14400;
 348         else if (baud <= 16062)    baud = 16000;
 349         else if (baud <= 19250)    baud = 19200;
 350         else if (baud <= 28912)    baud = 28800;
 351         else if (baud <= 38601)    baud = 38400;
 352         else if (baud <= 51558)    baud = 51200;
 353         else if (baud <= 56280)    baud = 56000;
 354         else if (baud <= 58053)    baud = 57600;
 355         else if (baud <= 64111)    baud = 64000;
 356         else if (baud <= 77608)    baud = 76800;
 357         else if (baud <= 117028)   baud = 115200;
 358         else if (baud <= 129347)   baud = 128000;
 359         else if (baud <= 156868)   baud = 153600;
 360         else if (baud <= 237832)   baud = 230400;
 361         else if (baud <= 254234)   baud = 250000;
 362         else if (baud <= 273066)   baud = 256000;
 363         else if (baud <= 491520)   baud = 460800;
 364         else if (baud <= 567138)   baud = 500000;
 365         else if (baud <= 670254)   baud = 576000;
 366         else if (baud <= 1053257)  baud = 921600;
 367         else if (baud <= 1474560)  baud = 1228800;
 368         else if (baud <= 2457600)  baud = 1843200;
 369         else                       baud = 3686400;
 370         return baud;
 371 }
 372
 373 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 374 {
 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         result = usb_serial_generic_submit_read_urb(port, GFP_KERNEL);
 386         if (result)
 387                 return result;
 388
 389         /* Configure the termios structure */
 390         cp210x_get_termios(tty, port);
 391         return 0;
 392 }
 393
 394 static void cp210x_cleanup(struct usb_serial_port *port)
 395 {
 396         struct usb_serial *serial = port->serial;
 397
 398         dbg("%s - port %d", __func__, port->number);
 399
 400         if (serial->dev) {
 401                 /* shutdown any bulk reads that might be going on */
 402                 if (serial->num_bulk_out)
 403                         usb_kill_urb(port->write_urb);
 404                 if (serial->num_bulk_in)
 405                         usb_kill_urb(port->read_urb);
 406         }
 407 }
 408
 409 static void cp210x_close(struct usb_serial_port *port)
 410 {
 411         dbg("%s - port %d", __func__, port->number);
 412
 413         usb_serial_generic_close(port);
 414
 415         mutex_lock(&port->serial->disc_mutex);
 416         if (!port->serial->disconnected)
 417                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 418         mutex_unlock(&port->serial->disc_mutex);
 419 }
 420
 421 /*
 422  * cp210x_get_termios
 423  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 424  * from the device, corrects any unsupported values, and configures the
 425  * termios structure to reflect the state of the device
 426  */
 427 static void cp210x_get_termios(struct tty_struct *tty,
 428         struct usb_serial_port *port)
 429 {
 430         unsigned int baud;
 431
 432         if (tty) {
 433                 cp210x_get_termios_port(tty->driver_data,
 434                         &tty->termios->c_cflag, &baud);
 435                 tty_encode_baud_rate(tty, baud, baud);
 436         }
 437
 438         else {
 439                 unsigned int cflag;
 440                 cflag = 0;
 441                 cp210x_get_termios_port(port, &cflag, &baud);
 442         }
 443 }
 444
 445 /*
 446  * cp210x_get_termios_port
 447  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 448  */
 449 static void cp210x_get_termios_port(struct usb_serial_port *port,
 450         unsigned int *cflagp, unsigned int *baudp)
 451 {
 452         unsigned int cflag, modem_ctl[4];
 453         unsigned int baud;
 454         unsigned int bits;
 455
 456         dbg("%s - port %d", __func__, port->number);
 457
 458         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 459         /* Convert to baudrate */
 460         if (baud)
 461                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 462
 463         dbg("%s - baud rate = %d", __func__, baud);
 464         *baudp = baud;
 465
 466         cflag = *cflagp;
 467
 468         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 469         cflag &= ~CSIZE;
 470         switch (bits & BITS_DATA_MASK) {
 471         case BITS_DATA_5:
 472                 dbg("%s - data bits = 5", __func__);
 473                 cflag |= CS5;
 474                 break;
 475         case BITS_DATA_6:
 476                 dbg("%s - data bits = 6", __func__);
 477                 cflag |= CS6;
 478                 break;
 479         case BITS_DATA_7:
 480                 dbg("%s - data bits = 7", __func__);
 481                 cflag |= CS7;
 482                 break;
 483         case BITS_DATA_8:
 484                 dbg("%s - data bits = 8", __func__);
 485                 cflag |= CS8;
 486                 break;
 487         case BITS_DATA_9:
 488                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 489                                                                 __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         default:
 496                 dbg("%s - Unknown number of data bits, using 8", __func__);
 497                 cflag |= CS8;
 498                 bits &= ~BITS_DATA_MASK;
 499                 bits |= BITS_DATA_8;
 500                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 501                 break;
 502         }
 503
 504         switch (bits & BITS_PARITY_MASK) {
 505         case BITS_PARITY_NONE:
 506                 dbg("%s - parity = NONE", __func__);
 507                 cflag &= ~PARENB;
 508                 break;
 509         case BITS_PARITY_ODD:
 510                 dbg("%s - parity = ODD", __func__);
 511                 cflag |= (PARENB|PARODD);
 512                 break;
 513         case BITS_PARITY_EVEN:
 514                 dbg("%s - parity = EVEN", __func__);
 515                 cflag &= ~PARODD;
 516                 cflag |= PARENB;
 517                 break;
 518         case BITS_PARITY_MARK:
 519                 dbg("%s - parity = MARK (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         case BITS_PARITY_SPACE:
 526                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 527                                 __func__);
 528                 cflag &= ~PARENB;
 529                 bits &= ~BITS_PARITY_MASK;
 530                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 531                 break;
 532         default:
 533                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 534                 cflag &= ~PARENB;
 535                 bits &= ~BITS_PARITY_MASK;
 536                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 537                 break;
 538         }
 539
 540         cflag &= ~CSTOPB;
 541         switch (bits & BITS_STOP_MASK) {
 542         case BITS_STOP_1:
 543                 dbg("%s - stop bits = 1", __func__);
 544                 break;
 545         case BITS_STOP_1_5:
 546                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 547                                                                 __func__);
 548                 bits &= ~BITS_STOP_MASK;
 549                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 550                 break;
 551         case BITS_STOP_2:
 552                 dbg("%s - stop bits = 2", __func__);
 553                 cflag |= CSTOPB;
 554                 break;
 555         default:
 556                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 557                                                                 __func__);
 558                 bits &= ~BITS_STOP_MASK;
 559                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 560                 break;
 561         }
 562
 563         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 564         if (modem_ctl[0] & 0x0008) {
 565                 dbg("%s - flow control = CRTSCTS", __func__);
 566                 cflag |= CRTSCTS;
 567         } else {
 568                 dbg("%s - flow control = NONE", __func__);
 569                 cflag &= ~CRTSCTS;
 570         }
 571
 572         *cflagp = cflag;
 573 }
 574
 575 static void cp210x_set_termios(struct tty_struct *tty,
 576                 struct usb_serial_port *port, struct ktermios *old_termios)
 577 {
 578         unsigned int cflag, old_cflag;
 579         unsigned int baud = 0, bits;
 580         unsigned int modem_ctl[4];
 581
 582         dbg("%s - port %d", __func__, port->number);
 583
 584         if (!tty)
 585                 return;
 586
 587         tty->termios->c_cflag &= ~CMSPAR;
 588         cflag = tty->termios->c_cflag;
 589         old_cflag = old_termios->c_cflag;
 590         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 591
 592         /* If the baud rate is to be updated*/
 593         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 594                 dbg("%s - Setting baud rate to %d baud", __func__,
 595                                 baud);
 596                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 597                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 598                         dbg("Baud rate requested not supported by device");
 599                         baud = tty_termios_baud_rate(old_termios);
 600                 }
 601         }
 602         /* Report back the resulting baud rate */
 603         tty_encode_baud_rate(tty, baud, baud);
 604
 605         /* If the number of data bits is to be updated */
 606         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 607                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 608                 bits &= ~BITS_DATA_MASK;
 609                 switch (cflag & CSIZE) {
 610                 case CS5:
 611                         bits |= BITS_DATA_5;
 612                         dbg("%s - data bits = 5", __func__);
 613                         break;
 614                 case CS6:
 615                         bits |= BITS_DATA_6;
 616                         dbg("%s - data bits = 6", __func__);
 617                         break;
 618                 case CS7:
 619                         bits |= BITS_DATA_7;
 620                         dbg("%s - data bits = 7", __func__);
 621                         break;
 622                 case CS8:
 623                         bits |= BITS_DATA_8;
 624                         dbg("%s - data bits = 8", __func__);
 625                         break;
 626                 /*case CS9:
 627                         bits |= BITS_DATA_9;
 628                         dbg("%s - data bits = 9", __func__);
 629                         break;*/
 630                 default:
 631                         dbg("cp210x driver does not "
 632                                         "support the number of bits requested,"
 633                                         " using 8 bit mode\n");
 634                                 bits |= BITS_DATA_8;
 635                                 break;
 636                 }
 637                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 638                         dbg("Number of data bits requested "
 639                                         "not supported by device\n");
 640         }
 641
 642         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 643                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 644                 bits &= ~BITS_PARITY_MASK;
 645                 if (cflag & PARENB) {
 646                         if (cflag & PARODD) {
 647                                 bits |= BITS_PARITY_ODD;
 648                                 dbg("%s - parity = ODD", __func__);
 649                         } else {
 650                                 bits |= BITS_PARITY_EVEN;
 651                                 dbg("%s - parity = EVEN", __func__);
 652                         }
 653                 }
 654                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 655                         dbg("Parity mode not supported "
 656                                         "by device\n");
 657         }
 658
 659         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 660                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 661                 bits &= ~BITS_STOP_MASK;
 662                 if (cflag & CSTOPB) {
 663                         bits |= BITS_STOP_2;
 664                         dbg("%s - stop bits = 2", __func__);
 665                 } else {
 666                         bits |= BITS_STOP_1;
 667                         dbg("%s - stop bits = 1", __func__);
 668                 }
 669                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 670                         dbg("Number of stop bits requested "
 671                                         "not supported by device\n");
 672         }
 673
 674         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 675                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 676                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 677                                 __func__, modem_ctl[0], modem_ctl[1],
 678                                 modem_ctl[2], modem_ctl[3]);
 679
 680                 if (cflag & CRTSCTS) {
 681                         modem_ctl[0] &= ~0x7B;
 682                         modem_ctl[0] |= 0x09;
 683                         modem_ctl[1] = 0x80;
 684                         dbg("%s - flow control = CRTSCTS", __func__);
 685                 } else {
 686                         modem_ctl[0] &= ~0x7B;
 687                         modem_ctl[0] |= 0x01;
 688                         modem_ctl[1] |= 0x40;
 689                         dbg("%s - flow control = NONE", __func__);
 690                 }
 691
 692                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 693                                 __func__, modem_ctl[0], modem_ctl[1],
 694                                 modem_ctl[2], modem_ctl[3]);
 695                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 696         }
 697
 698 }
 699
 700 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
 701                 unsigned int set, unsigned int clear)
 702 {
 703         struct usb_serial_port *port = tty->driver_data;
 704         return cp210x_tiocmset_port(port, file, set, clear);
 705 }
 706
 707 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
 708                 unsigned int set, unsigned int clear)
 709 {
 710         unsigned int control = 0;
 711
 712         dbg("%s - port %d", __func__, port->number);
 713
 714         if (set & TIOCM_RTS) {
 715                 control |= CONTROL_RTS;
 716                 control |= CONTROL_WRITE_RTS;
 717         }
 718         if (set & TIOCM_DTR) {
 719                 control |= CONTROL_DTR;
 720                 control |= CONTROL_WRITE_DTR;
 721         }
 722         if (clear & TIOCM_RTS) {
 723                 control &= ~CONTROL_RTS;
 724                 control |= CONTROL_WRITE_RTS;
 725         }
 726         if (clear & TIOCM_DTR) {
 727                 control &= ~CONTROL_DTR;
 728                 control |= CONTROL_WRITE_DTR;
 729         }
 730
 731         dbg("%s - control = 0x%.4x", __func__, control);
 732
 733         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 734 }
 735
 736 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 737 {
 738         if (on)
 739                 cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
 740         else
 741                 cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
 742 }
 743
 744 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 745 {
 746         struct usb_serial_port *port = tty->driver_data;
 747         unsigned int control;
 748         int result;
 749
 750         dbg("%s - port %d", __func__, port->number);
 751
 752         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 753
 754         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 755                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 756                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 757                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 758                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 759                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 760
 761         dbg("%s - control = 0x%.2x", __func__, control);
 762
 763         return result;
 764 }
 765
 766 static int cp210x_carrier_raised(struct usb_serial_port *p)
 767 {
 768         unsigned int control;
 769         cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
 770         if (control & CONTROL_DCD)
 771                 return 1;
 772         return 0;
 773 }
 774
 775 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 776 {
 777         struct usb_serial_port *port = tty->driver_data;
 778         unsigned int state;
 779
 780         dbg("%s - port %d", __func__, port->number);
 781         if (break_state == 0)
 782                 state = BREAK_OFF;
 783         else
 784                 state = BREAK_ON;
 785         dbg("%s - turning break %s", __func__,
 786                         state == BREAK_OFF ? "off" : "on");
 787         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 788 }
 789
 790 static int cp210x_startup(struct usb_serial *serial)
 791 {
 792         /* cp210x buffers behave strangely unless device is reset */
 793         usb_reset_device(serial->dev);
 794         return 0;
 795 }
 796
 797 static void cp210x_disconnect(struct usb_serial *serial)
 798 {
 799         int i;
 800
 801         dbg("%s", __func__);
 802
 803         /* Stop reads and writes on all ports */
 804         for (i = 0; i < serial->num_ports; ++i)
 805                 cp210x_cleanup(serial->port[i]);
 806 }
 807
 808 static int __init cp210x_init(void)
 809 {
 810         int retval;
 811
 812         retval = usb_serial_register(&cp210x_device);
 813         if (retval)
 814                 return retval; /* Failed to register */
 815
 816         retval = usb_register(&cp210x_driver);
 817         if (retval) {
 818                 /* Failed to register */
 819                 usb_serial_deregister(&cp210x_device);
 820                 return retval;
 821         }
 822
 823         /* Success */
 824         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 825                DRIVER_DESC "\n");
 826         return 0;
 827 }
 828
 829 static void __exit cp210x_exit(void)
 830 {
 831         usb_deregister(&cp210x_driver);
 832         usb_serial_deregister(&cp210x_device);
 833 }
 834
 835 module_init(cp210x_init);
 836 module_exit(cp210x_exit);
 837
 838 MODULE_DESCRIPTION(DRIVER_DESC);
 839 MODULE_VERSION(DRIVER_VERSION);
 840 MODULE_LICENSE("GPL");
 841
 842 module_param(debug, bool, S_IRUGO | S_IWUSR);
 843 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");