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 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, 0x81F2) }, /* C1007 HF band RFID controller */
  95         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  96         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
  97         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
  98         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  99         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 100         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 101         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 102         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 103         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 104         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 105         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 106         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 107         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 108         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 109         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 110         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 111         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 112         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 113         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 114         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 115         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 116         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 117         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 118         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 119         { } /* Terminating Entry */
 120 };
 121
 122 MODULE_DEVICE_TABLE(usb, id_table);
 123
 124 static struct usb_driver cp210x_driver = {
 125         .name           = "cp210x",
 126         .probe          = usb_serial_probe,
 127         .disconnect     = usb_serial_disconnect,
 128         .id_table       = id_table,
 129         .no_dynamic_id  =       1,
 130 };
 131
 132 static struct usb_serial_driver cp210x_device = {
 133         .driver = {
 134                 .owner =        THIS_MODULE,
 135                 .name =         "cp210x",
 136         },
 137         .usb_driver             = &cp210x_driver,
 138         .id_table               = id_table,
 139         .num_ports              = 1,
 140         .open                   = cp210x_open,
 141         .close                  = cp210x_close,
 142         .break_ctl              = cp210x_break_ctl,
 143         .set_termios            = cp210x_set_termios,
 144         .tiocmget               = cp210x_tiocmget,
 145         .tiocmset               = cp210x_tiocmset,
 146         .attach                 = cp210x_startup,
 147         .disconnect             = cp210x_disconnect,
 148         .dtr_rts                = cp210x_dtr_rts,
 149         .carrier_raised         = cp210x_carrier_raised
 150 };
 151
 152 /* Config request types */
 153 #define REQTYPE_HOST_TO_DEVICE  0x41
 154 #define REQTYPE_DEVICE_TO_HOST  0xc1
 155
 156 /* Config request codes */
 157 #define CP210X_IFC_ENABLE       0x00
 158 #define CP210X_SET_BAUDDIV      0x01
 159 #define CP210X_GET_BAUDDIV      0x02
 160 #define CP210X_SET_LINE_CTL     0x03
 161 #define CP210X_GET_LINE_CTL     0x04
 162 #define CP210X_SET_BREAK        0x05
 163 #define CP210X_IMM_CHAR         0x06
 164 #define CP210X_SET_MHS          0x07
 165 #define CP210X_GET_MDMSTS       0x08
 166 #define CP210X_SET_XON          0x09
 167 #define CP210X_SET_XOFF         0x0A
 168 #define CP210X_SET_EVENTMASK    0x0B
 169 #define CP210X_GET_EVENTMASK    0x0C
 170 #define CP210X_SET_CHAR         0x0D
 171 #define CP210X_GET_CHARS        0x0E
 172 #define CP210X_GET_PROPS        0x0F
 173 #define CP210X_GET_COMM_STATUS  0x10
 174 #define CP210X_RESET            0x11
 175 #define CP210X_PURGE            0x12
 176 #define CP210X_SET_FLOW         0x13
 177 #define CP210X_GET_FLOW         0x14
 178 #define CP210X_EMBED_EVENTS     0x15
 179 #define CP210X_GET_EVENTSTATE   0x16
 180 #define CP210X_SET_CHARS        0x19
 181
 182 /* CP210X_IFC_ENABLE */
 183 #define UART_ENABLE             0x0001
 184 #define UART_DISABLE            0x0000
 185
 186 /* CP210X_(SET|GET)_BAUDDIV */
 187 #define BAUD_RATE_GEN_FREQ      0x384000
 188
 189 /* CP210X_(SET|GET)_LINE_CTL */
 190 #define BITS_DATA_MASK          0X0f00
 191 #define BITS_DATA_5             0X0500
 192 #define BITS_DATA_6             0X0600
 193 #define BITS_DATA_7             0X0700
 194 #define BITS_DATA_8             0X0800
 195 #define BITS_DATA_9             0X0900
 196
 197 #define BITS_PARITY_MASK        0x00f0
 198 #define BITS_PARITY_NONE        0x0000
 199 #define BITS_PARITY_ODD         0x0010
 200 #define BITS_PARITY_EVEN        0x0020
 201 #define BITS_PARITY_MARK        0x0030
 202 #define BITS_PARITY_SPACE       0x0040
 203
 204 #define BITS_STOP_MASK          0x000f
 205 #define BITS_STOP_1             0x0000
 206 #define BITS_STOP_1_5           0x0001
 207 #define BITS_STOP_2             0x0002
 208
 209 /* CP210X_SET_BREAK */
 210 #define BREAK_ON                0x0000
 211 #define BREAK_OFF               0x0001
 212
 213 /* CP210X_(SET_MHS|GET_MDMSTS) */
 214 #define CONTROL_DTR             0x0001
 215 #define CONTROL_RTS             0x0002
 216 #define CONTROL_CTS             0x0010
 217 #define CONTROL_DSR             0x0020
 218 #define CONTROL_RING            0x0040
 219 #define CONTROL_DCD             0x0080
 220 #define CONTROL_WRITE_DTR       0x0100
 221 #define CONTROL_WRITE_RTS       0x0200
 222
 223 /*
 224  * cp210x_get_config
 225  * Reads from the CP210x configuration registers
 226  * 'size' is specified in bytes.
 227  * 'data' is a pointer to a pre-allocated array of integers large
 228  * enough to hold 'size' bytes (with 4 bytes to each integer)
 229  */
 230 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 231                 unsigned int *data, int size)
 232 {
 233         struct usb_serial *serial = port->serial;
 234         __le32 *buf;
 235         int result, i, length;
 236
 237         /* Number of integers required to contain the array */
 238         length = (((size - 1) | 3) + 1)/4;
 239
 240         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 241         if (!buf) {
 242                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 243                 return -ENOMEM;
 244         }
 245
 246         /* Issue the request, attempting to read 'size' bytes */
 247         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 248                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 249                                 0, buf, size, 300);
 250
 251         /* Convert data into an array of integers */
 252         for (i = 0; i < length; i++)
 253                 data[i] = le32_to_cpu(buf[i]);
 254
 255         kfree(buf);
 256
 257         if (result != size) {
 258                 dbg("%s - Unable to send config request, "
 259                                 "request=0x%x size=%d result=%d\n",
 260                                 __func__, request, size, result);
 261                 return -EPROTO;
 262         }
 263
 264         return 0;
 265 }
 266
 267 /*
 268  * cp210x_set_config
 269  * Writes to the CP210x configuration registers
 270  * Values less than 16 bits wide are sent directly
 271  * 'size' is specified in bytes.
 272  */
 273 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 274                 unsigned int *data, int size)
 275 {
 276         struct usb_serial *serial = port->serial;
 277         __le32 *buf;
 278         int result, i, length;
 279
 280         /* Number of integers required to contain the array */
 281         length = (((size - 1) | 3) + 1)/4;
 282
 283         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 284         if (!buf) {
 285                 dev_err(&port->dev, "%s - out of memory.\n",
 286                                 __func__);
 287                 return -ENOMEM;
 288         }
 289
 290         /* Array of integers into bytes */
 291         for (i = 0; i < length; i++)
 292                 buf[i] = cpu_to_le32(data[i]);
 293
 294         if (size > 2) {
 295                 result = usb_control_msg(serial->dev,
 296                                 usb_sndctrlpipe(serial->dev, 0),
 297                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 298                                 0, buf, size, 300);
 299         } else {
 300                 result = usb_control_msg(serial->dev,
 301                                 usb_sndctrlpipe(serial->dev, 0),
 302                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 303                                 0, NULL, 0, 300);
 304         }
 305
 306         kfree(buf);
 307
 308         if ((size > 2 && result != size) || result < 0) {
 309                 dbg("%s - Unable to send request, "
 310                                 "request=0x%x size=%d result=%d\n",
 311                                 __func__, request, size, result);
 312                 return -EPROTO;
 313         }
 314
 315         /* Single data value */
 316         result = usb_control_msg(serial->dev,
 317                         usb_sndctrlpipe(serial->dev, 0),
 318                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 319                         0, NULL, 0, 300);
 320         return 0;
 321 }
 322
 323 /*
 324  * cp210x_set_config_single
 325  * Convenience function for calling cp210x_set_config on single data values
 326  * without requiring an integer pointer
 327  */
 328 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 329                 u8 request, unsigned int data)
 330 {
 331         return cp210x_set_config(port, request, &data, 2);
 332 }
 333
 334 /*
 335  * cp210x_quantise_baudrate
 336  * Quantises the baud rate as per AN205 Table 1
 337  */
 338 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 339         if      (baud <= 56)       baud = 0;
 340         else if (baud <= 300)      baud = 300;
 341         else if (baud <= 600)      baud = 600;
 342         else if (baud <= 1200)     baud = 1200;
 343         else if (baud <= 1800)     baud = 1800;
 344         else if (baud <= 2400)     baud = 2400;
 345         else if (baud <= 4000)     baud = 4000;
 346         else if (baud <= 4803)     baud = 4800;
 347         else if (baud <= 7207)     baud = 7200;
 348         else if (baud <= 9612)     baud = 9600;
 349         else if (baud <= 14428)    baud = 14400;
 350         else if (baud <= 16062)    baud = 16000;
 351         else if (baud <= 19250)    baud = 19200;
 352         else if (baud <= 28912)    baud = 28800;
 353         else if (baud <= 38601)    baud = 38400;
 354         else if (baud <= 51558)    baud = 51200;
 355         else if (baud <= 56280)    baud = 56000;
 356         else if (baud <= 58053)    baud = 57600;
 357         else if (baud <= 64111)    baud = 64000;
 358         else if (baud <= 77608)    baud = 76800;
 359         else if (baud <= 117028)   baud = 115200;
 360         else if (baud <= 129347)   baud = 128000;
 361         else if (baud <= 156868)   baud = 153600;
 362         else if (baud <= 237832)   baud = 230400;
 363         else if (baud <= 254234)   baud = 250000;
 364         else if (baud <= 273066)   baud = 256000;
 365         else if (baud <= 491520)   baud = 460800;
 366         else if (baud <= 567138)   baud = 500000;
 367         else if (baud <= 670254)   baud = 576000;
 368         else if (baud <= 1053257)  baud = 921600;
 369         else if (baud <= 1474560)  baud = 1228800;
 370         else if (baud <= 2457600)  baud = 1843200;
 371         else                       baud = 3686400;
 372         return baud;
 373 }
 374
 375 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 376 {
 377         struct usb_serial *serial = port->serial;
 378         int result;
 379
 380         dbg("%s - port %d", __func__, port->number);
 381
 382         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
 383                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 384                                 __func__);
 385                 return -EPROTO;
 386         }
 387
 388         /* Start reading from the device */
 389         usb_fill_bulk_urb(port->read_urb, serial->dev,
 390                         usb_rcvbulkpipe(serial->dev,
 391                         port->bulk_in_endpointAddress),
 392                         port->read_urb->transfer_buffer,
 393                         port->read_urb->transfer_buffer_length,
 394                         serial->type->read_bulk_callback,
 395                         port);
 396         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 397         if (result) {
 398                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 399                                 "error %d\n", __func__, result);
 400                 return result;
 401         }
 402
 403         /* Configure the termios structure */
 404         cp210x_get_termios(tty, port);
 405         return 0;
 406 }
 407
 408 static void cp210x_cleanup(struct usb_serial_port *port)
 409 {
 410         struct usb_serial *serial = port->serial;
 411
 412         dbg("%s - port %d", __func__, port->number);
 413
 414         if (serial->dev) {
 415                 /* shutdown any bulk reads that might be going on */
 416                 if (serial->num_bulk_out)
 417                         usb_kill_urb(port->write_urb);
 418                 if (serial->num_bulk_in)
 419                         usb_kill_urb(port->read_urb);
 420         }
 421 }
 422
 423 static void cp210x_close(struct usb_serial_port *port)
 424 {
 425         dbg("%s - port %d", __func__, port->number);
 426
 427         /* shutdown our urbs */
 428         dbg("%s - shutting down urbs", __func__);
 429         usb_kill_urb(port->write_urb);
 430         usb_kill_urb(port->read_urb);
 431
 432         mutex_lock(&port->serial->disc_mutex);
 433         if (!port->serial->disconnected)
 434                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 435         mutex_unlock(&port->serial->disc_mutex);
 436 }
 437
 438 /*
 439  * cp210x_get_termios
 440  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 441  * from the device, corrects any unsupported values, and configures the
 442  * termios structure to reflect the state of the device
 443  */
 444 static void cp210x_get_termios(struct tty_struct *tty,
 445         struct usb_serial_port *port)
 446 {
 447         unsigned int baud;
 448
 449         if (tty) {
 450                 cp210x_get_termios_port(tty->driver_data,
 451                         &tty->termios->c_cflag, &baud);
 452                 tty_encode_baud_rate(tty, baud, baud);
 453         }
 454
 455         else {
 456                 unsigned int cflag;
 457                 cflag = 0;
 458                 cp210x_get_termios_port(port, &cflag, &baud);
 459         }
 460 }
 461
 462 /*
 463  * cp210x_get_termios_port
 464  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 465  */
 466 static void cp210x_get_termios_port(struct usb_serial_port *port,
 467         unsigned int *cflagp, unsigned int *baudp)
 468 {
 469         unsigned int cflag, modem_ctl[4];
 470         unsigned int baud;
 471         unsigned int bits;
 472
 473         dbg("%s - port %d", __func__, port->number);
 474
 475         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 476         /* Convert to baudrate */
 477         if (baud)
 478                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 479
 480         dbg("%s - baud rate = %d", __func__, baud);
 481         *baudp = baud;
 482
 483         cflag = *cflagp;
 484
 485         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 486         cflag &= ~CSIZE;
 487         switch (bits & BITS_DATA_MASK) {
 488         case BITS_DATA_5:
 489                 dbg("%s - data bits = 5", __func__);
 490                 cflag |= CS5;
 491                 break;
 492         case BITS_DATA_6:
 493                 dbg("%s - data bits = 6", __func__);
 494                 cflag |= CS6;
 495                 break;
 496         case BITS_DATA_7:
 497                 dbg("%s - data bits = 7", __func__);
 498                 cflag |= CS7;
 499                 break;
 500         case BITS_DATA_8:
 501                 dbg("%s - data bits = 8", __func__);
 502                 cflag |= CS8;
 503                 break;
 504         case BITS_DATA_9:
 505                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 506                                                                 __func__);
 507                 cflag |= CS8;
 508                 bits &= ~BITS_DATA_MASK;
 509                 bits |= BITS_DATA_8;
 510                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 511                 break;
 512         default:
 513                 dbg("%s - Unknown number of data bits, using 8", __func__);
 514                 cflag |= CS8;
 515                 bits &= ~BITS_DATA_MASK;
 516                 bits |= BITS_DATA_8;
 517                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 518                 break;
 519         }
 520
 521         switch (bits & BITS_PARITY_MASK) {
 522         case BITS_PARITY_NONE:
 523                 dbg("%s - parity = NONE", __func__);
 524                 cflag &= ~PARENB;
 525                 break;
 526         case BITS_PARITY_ODD:
 527                 dbg("%s - parity = ODD", __func__);
 528                 cflag |= (PARENB|PARODD);
 529                 break;
 530         case BITS_PARITY_EVEN:
 531                 dbg("%s - parity = EVEN", __func__);
 532                 cflag &= ~PARODD;
 533                 cflag |= PARENB;
 534                 break;
 535         case BITS_PARITY_MARK:
 536                 dbg("%s - parity = MARK (not supported, disabling parity)",
 537                                 __func__);
 538                 cflag &= ~PARENB;
 539                 bits &= ~BITS_PARITY_MASK;
 540                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 541                 break;
 542         case BITS_PARITY_SPACE:
 543                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 544                                 __func__);
 545                 cflag &= ~PARENB;
 546                 bits &= ~BITS_PARITY_MASK;
 547                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 548                 break;
 549         default:
 550                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 551                 cflag &= ~PARENB;
 552                 bits &= ~BITS_PARITY_MASK;
 553                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 554                 break;
 555         }
 556
 557         cflag &= ~CSTOPB;
 558         switch (bits & BITS_STOP_MASK) {
 559         case BITS_STOP_1:
 560                 dbg("%s - stop bits = 1", __func__);
 561                 break;
 562         case BITS_STOP_1_5:
 563                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 564                                                                 __func__);
 565                 bits &= ~BITS_STOP_MASK;
 566                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 567                 break;
 568         case BITS_STOP_2:
 569                 dbg("%s - stop bits = 2", __func__);
 570                 cflag |= CSTOPB;
 571                 break;
 572         default:
 573                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 574                                                                 __func__);
 575                 bits &= ~BITS_STOP_MASK;
 576                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 577                 break;
 578         }
 579
 580         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 581         if (modem_ctl[0] & 0x0008) {
 582                 dbg("%s - flow control = CRTSCTS", __func__);
 583                 cflag |= CRTSCTS;
 584         } else {
 585                 dbg("%s - flow control = NONE", __func__);
 586                 cflag &= ~CRTSCTS;
 587         }
 588
 589         *cflagp = cflag;
 590 }
 591
 592 static void cp210x_set_termios(struct tty_struct *tty,
 593                 struct usb_serial_port *port, struct ktermios *old_termios)
 594 {
 595         unsigned int cflag, old_cflag;
 596         unsigned int baud = 0, bits;
 597         unsigned int modem_ctl[4];
 598
 599         dbg("%s - port %d", __func__, port->number);
 600
 601         if (!tty)
 602                 return;
 603
 604         tty->termios->c_cflag &= ~CMSPAR;
 605         cflag = tty->termios->c_cflag;
 606         old_cflag = old_termios->c_cflag;
 607         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 608
 609         /* If the baud rate is to be updated*/
 610         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 611                 dbg("%s - Setting baud rate to %d baud", __func__,
 612                                 baud);
 613                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 614                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 615                         dbg("Baud rate requested not supported by device\n");
 616                         baud = tty_termios_baud_rate(old_termios);
 617                 }
 618         }
 619         /* Report back the resulting baud rate */
 620         tty_encode_baud_rate(tty, baud, baud);
 621
 622         /* If the number of data bits is to be updated */
 623         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 624                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 625                 bits &= ~BITS_DATA_MASK;
 626                 switch (cflag & CSIZE) {
 627                 case CS5:
 628                         bits |= BITS_DATA_5;
 629                         dbg("%s - data bits = 5", __func__);
 630                         break;
 631                 case CS6:
 632                         bits |= BITS_DATA_6;
 633                         dbg("%s - data bits = 6", __func__);
 634                         break;
 635                 case CS7:
 636                         bits |= BITS_DATA_7;
 637                         dbg("%s - data bits = 7", __func__);
 638                         break;
 639                 case CS8:
 640                         bits |= BITS_DATA_8;
 641                         dbg("%s - data bits = 8", __func__);
 642                         break;
 643                 /*case CS9:
 644                         bits |= BITS_DATA_9;
 645                         dbg("%s - data bits = 9", __func__);
 646                         break;*/
 647                 default:
 648                         dbg("cp210x driver does not "
 649                                         "support the number of bits requested,"
 650                                         " using 8 bit mode\n");
 651                                 bits |= BITS_DATA_8;
 652                                 break;
 653                 }
 654                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 655                         dbg("Number of data bits requested "
 656                                         "not supported by device\n");
 657         }
 658
 659         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 660                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 661                 bits &= ~BITS_PARITY_MASK;
 662                 if (cflag & PARENB) {
 663                         if (cflag & PARODD) {
 664                                 bits |= BITS_PARITY_ODD;
 665                                 dbg("%s - parity = ODD", __func__);
 666                         } else {
 667                                 bits |= BITS_PARITY_EVEN;
 668                                 dbg("%s - parity = EVEN", __func__);
 669                         }
 670                 }
 671                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 672                         dbg("Parity mode not supported "
 673                                         "by device\n");
 674         }
 675
 676         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 677                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 678                 bits &= ~BITS_STOP_MASK;
 679                 if (cflag & CSTOPB) {
 680                         bits |= BITS_STOP_2;
 681                         dbg("%s - stop bits = 2", __func__);
 682                 } else {
 683                         bits |= BITS_STOP_1;
 684                         dbg("%s - stop bits = 1", __func__);
 685                 }
 686                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 687                         dbg("Number of stop bits requested "
 688                                         "not supported by device\n");
 689         }
 690
 691         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 692                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 693                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 694                                 __func__, modem_ctl[0], modem_ctl[1],
 695                                 modem_ctl[2], modem_ctl[3]);
 696
 697                 if (cflag & CRTSCTS) {
 698                         modem_ctl[0] &= ~0x7B;
 699                         modem_ctl[0] |= 0x09;
 700                         modem_ctl[1] = 0x80;
 701                         dbg("%s - flow control = CRTSCTS", __func__);
 702                 } else {
 703                         modem_ctl[0] &= ~0x7B;
 704                         modem_ctl[0] |= 0x01;
 705                         modem_ctl[1] |= 0x40;
 706                         dbg("%s - flow control = NONE", __func__);
 707                 }
 708
 709                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 710                                 __func__, modem_ctl[0], modem_ctl[1],
 711                                 modem_ctl[2], modem_ctl[3]);
 712                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 713         }
 714
 715 }
 716
 717 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
 718                 unsigned int set, unsigned int clear)
 719 {
 720         struct usb_serial_port *port = tty->driver_data;
 721         return cp210x_tiocmset_port(port, file, set, clear);
 722 }
 723
 724 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
 725                 unsigned int set, unsigned int clear)
 726 {
 727         unsigned int control = 0;
 728
 729         dbg("%s - port %d", __func__, port->number);
 730
 731         if (set & TIOCM_RTS) {
 732                 control |= CONTROL_RTS;
 733                 control |= CONTROL_WRITE_RTS;
 734         }
 735         if (set & TIOCM_DTR) {
 736                 control |= CONTROL_DTR;
 737                 control |= CONTROL_WRITE_DTR;
 738         }
 739         if (clear & TIOCM_RTS) {
 740                 control &= ~CONTROL_RTS;
 741                 control |= CONTROL_WRITE_RTS;
 742         }
 743         if (clear & TIOCM_DTR) {
 744                 control &= ~CONTROL_DTR;
 745                 control |= CONTROL_WRITE_DTR;
 746         }
 747
 748         dbg("%s - control = 0x%.4x", __func__, control);
 749
 750         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 751 }
 752
 753 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 754 {
 755         if (on)
 756                 cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
 757         else
 758                 cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
 759 }
 760
 761 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 762 {
 763         struct usb_serial_port *port = tty->driver_data;
 764         unsigned int control;
 765         int result;
 766
 767         dbg("%s - port %d", __func__, port->number);
 768
 769         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 770
 771         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 772                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 773                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 774                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 775                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 776                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 777
 778         dbg("%s - control = 0x%.2x", __func__, control);
 779
 780         return result;
 781 }
 782
 783 static int cp210x_carrier_raised(struct usb_serial_port *p)
 784 {
 785         unsigned int control;
 786         cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
 787         if (control & CONTROL_DCD)
 788                 return 1;
 789         return 0;
 790 }
 791
 792 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 793 {
 794         struct usb_serial_port *port = tty->driver_data;
 795         unsigned int state;
 796
 797         dbg("%s - port %d", __func__, port->number);
 798         if (break_state == 0)
 799                 state = BREAK_OFF;
 800         else
 801                 state = BREAK_ON;
 802         dbg("%s - turning break %s", __func__,
 803                         state == BREAK_OFF ? "off" : "on");
 804         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 805 }
 806
 807 static int cp210x_startup(struct usb_serial *serial)
 808 {
 809         /* cp210x buffers behave strangely unless device is reset */
 810         usb_reset_device(serial->dev);
 811         return 0;
 812 }
 813
 814 static void cp210x_disconnect(struct usb_serial *serial)
 815 {
 816         int i;
 817
 818         dbg("%s", __func__);
 819
 820         /* Stop reads and writes on all ports */
 821         for (i = 0; i < serial->num_ports; ++i)
 822                 cp210x_cleanup(serial->port[i]);
 823 }
 824
 825 static int __init cp210x_init(void)
 826 {
 827         int retval;
 828
 829         retval = usb_serial_register(&cp210x_device);
 830         if (retval)
 831                 return retval; /* Failed to register */
 832
 833         retval = usb_register(&cp210x_driver);
 834         if (retval) {
 835                 /* Failed to register */
 836                 usb_serial_deregister(&cp210x_device);
 837                 return retval;
 838         }
 839
 840         /* Success */
 841         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 842                DRIVER_DESC "\n");
 843         return 0;
 844 }
 845
 846 static void __exit cp210x_exit(void)
 847 {
 848         usb_deregister(&cp210x_driver);
 849         usb_serial_deregister(&cp210x_device);
 850 }
 851
 852 module_init(cp210x_init);
 853 module_exit(cp210x_exit);
 854
 855 MODULE_DESCRIPTION(DRIVER_DESC);
 856 MODULE_VERSION(DRIVER_VERSION);
 857 MODULE_LICENSE("GPL");
 858
 859 module_param(debug, bool, S_IRUGO | S_IWUSR);
 860 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");