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 *);
  45 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
  46 static int cp210x_tiocmset_port(struct usb_serial_port *port,
  47                 unsigned int, unsigned int);
  48 static void cp210x_break_ctl(struct tty_struct *, int);
  49 static int cp210x_startup(struct usb_serial *);
  50 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  51
  52 static int debug;
  53
  54 static const struct usb_device_id id_table[] = {
  55         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  56         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  57         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  58         { USB_DEVICE(0x0489, 0xE003) }, /* 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, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  89         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  90         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  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, 0x81A9) }, /* Multiplex RC Interface */
  96         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  97         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
  98         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  99         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 100         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 101         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 102         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 103         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 104         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 105         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 106         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 107         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 108         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 109         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 110         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 111         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 112         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 113         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 114         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 115         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 116         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 117         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 118         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 119         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 120         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 121         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 122         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 123         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 124         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 125         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 126         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 127         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 128         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 129         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 130         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 131         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 132         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 133         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 134         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 135         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 136         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 137         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 138         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 139         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 140         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 141         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 142         { } /* Terminating Entry */
 143 };
 144
 145 MODULE_DEVICE_TABLE(usb, id_table);
 146
 147 static struct usb_driver cp210x_driver = {
 148         .name           = "cp210x",
 149         .probe          = usb_serial_probe,
 150         .disconnect     = usb_serial_disconnect,
 151         .id_table       = id_table,
 152         .no_dynamic_id  =       1,
 153 };
 154
 155 static struct usb_serial_driver cp210x_device = {
 156         .driver = {
 157                 .owner =        THIS_MODULE,
 158                 .name =         "cp210x",
 159         },
 160         .usb_driver             = &cp210x_driver,
 161         .id_table               = id_table,
 162         .num_ports              = 1,
 163         .bulk_in_size           = 256,
 164         .bulk_out_size          = 256,
 165         .open                   = cp210x_open,
 166         .close                  = cp210x_close,
 167         .break_ctl              = cp210x_break_ctl,
 168         .set_termios            = cp210x_set_termios,
 169         .tiocmget               = cp210x_tiocmget,
 170         .tiocmset               = cp210x_tiocmset,
 171         .attach                 = cp210x_startup,
 172         .dtr_rts                = cp210x_dtr_rts
 173 };
 174
 175 /* Config request types */
 176 #define REQTYPE_HOST_TO_DEVICE  0x41
 177 #define REQTYPE_DEVICE_TO_HOST  0xc1
 178
 179 /* Config request codes */
 180 #define CP210X_IFC_ENABLE       0x00
 181 #define CP210X_SET_BAUDDIV      0x01
 182 #define CP210X_GET_BAUDDIV      0x02
 183 #define CP210X_SET_LINE_CTL     0x03
 184 #define CP210X_GET_LINE_CTL     0x04
 185 #define CP210X_SET_BREAK        0x05
 186 #define CP210X_IMM_CHAR         0x06
 187 #define CP210X_SET_MHS          0x07
 188 #define CP210X_GET_MDMSTS       0x08
 189 #define CP210X_SET_XON          0x09
 190 #define CP210X_SET_XOFF         0x0A
 191 #define CP210X_SET_EVENTMASK    0x0B
 192 #define CP210X_GET_EVENTMASK    0x0C
 193 #define CP210X_SET_CHAR         0x0D
 194 #define CP210X_GET_CHARS        0x0E
 195 #define CP210X_GET_PROPS        0x0F
 196 #define CP210X_GET_COMM_STATUS  0x10
 197 #define CP210X_RESET            0x11
 198 #define CP210X_PURGE            0x12
 199 #define CP210X_SET_FLOW         0x13
 200 #define CP210X_GET_FLOW         0x14
 201 #define CP210X_EMBED_EVENTS     0x15
 202 #define CP210X_GET_EVENTSTATE   0x16
 203 #define CP210X_SET_CHARS        0x19
 204
 205 /* CP210X_IFC_ENABLE */
 206 #define UART_ENABLE             0x0001
 207 #define UART_DISABLE            0x0000
 208
 209 /* CP210X_(SET|GET)_BAUDDIV */
 210 #define BAUD_RATE_GEN_FREQ      0x384000
 211
 212 /* CP210X_(SET|GET)_LINE_CTL */
 213 #define BITS_DATA_MASK          0X0f00
 214 #define BITS_DATA_5             0X0500
 215 #define BITS_DATA_6             0X0600
 216 #define BITS_DATA_7             0X0700
 217 #define BITS_DATA_8             0X0800
 218 #define BITS_DATA_9             0X0900
 219
 220 #define BITS_PARITY_MASK        0x00f0
 221 #define BITS_PARITY_NONE        0x0000
 222 #define BITS_PARITY_ODD         0x0010
 223 #define BITS_PARITY_EVEN        0x0020
 224 #define BITS_PARITY_MARK        0x0030
 225 #define BITS_PARITY_SPACE       0x0040
 226
 227 #define BITS_STOP_MASK          0x000f
 228 #define BITS_STOP_1             0x0000
 229 #define BITS_STOP_1_5           0x0001
 230 #define BITS_STOP_2             0x0002
 231
 232 /* CP210X_SET_BREAK */
 233 #define BREAK_ON                0x0001
 234 #define BREAK_OFF               0x0000
 235
 236 /* CP210X_(SET_MHS|GET_MDMSTS) */
 237 #define CONTROL_DTR             0x0001
 238 #define CONTROL_RTS             0x0002
 239 #define CONTROL_CTS             0x0010
 240 #define CONTROL_DSR             0x0020
 241 #define CONTROL_RING            0x0040
 242 #define CONTROL_DCD             0x0080
 243 #define CONTROL_WRITE_DTR       0x0100
 244 #define CONTROL_WRITE_RTS       0x0200
 245
 246 /*
 247  * cp210x_get_config
 248  * Reads from the CP210x configuration registers
 249  * 'size' is specified in bytes.
 250  * 'data' is a pointer to a pre-allocated array of integers large
 251  * enough to hold 'size' bytes (with 4 bytes to each integer)
 252  */
 253 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 254                 unsigned int *data, int size)
 255 {
 256         struct usb_serial *serial = port->serial;
 257         __le32 *buf;
 258         int result, i, length;
 259
 260         /* Number of integers required to contain the array */
 261         length = (((size - 1) | 3) + 1)/4;
 262
 263         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 264         if (!buf) {
 265                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 266                 return -ENOMEM;
 267         }
 268
 269         /* Issue the request, attempting to read 'size' bytes */
 270         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 271                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 272                                 0, buf, size, 300);
 273
 274         /* Convert data into an array of integers */
 275         for (i = 0; i < length; i++)
 276                 data[i] = le32_to_cpu(buf[i]);
 277
 278         kfree(buf);
 279
 280         if (result != size) {
 281                 dbg("%s - Unable to send config request, "
 282                                 "request=0x%x size=%d result=%d\n",
 283                                 __func__, request, size, result);
 284                 if (result > 0)
 285                         result = -EPROTO;
 286
 287                 return result;
 288         }
 289
 290         return 0;
 291 }
 292
 293 /*
 294  * cp210x_set_config
 295  * Writes to the CP210x configuration registers
 296  * Values less than 16 bits wide are sent directly
 297  * 'size' is specified in bytes.
 298  */
 299 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 300                 unsigned int *data, int size)
 301 {
 302         struct usb_serial *serial = port->serial;
 303         __le32 *buf;
 304         int result, i, length;
 305
 306         /* Number of integers required to contain the array */
 307         length = (((size - 1) | 3) + 1)/4;
 308
 309         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 310         if (!buf) {
 311                 dev_err(&port->dev, "%s - out of memory.\n",
 312                                 __func__);
 313                 return -ENOMEM;
 314         }
 315
 316         /* Array of integers into bytes */
 317         for (i = 0; i < length; i++)
 318                 buf[i] = cpu_to_le32(data[i]);
 319
 320         if (size > 2) {
 321                 result = usb_control_msg(serial->dev,
 322                                 usb_sndctrlpipe(serial->dev, 0),
 323                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 324                                 0, buf, size, 300);
 325         } else {
 326                 result = usb_control_msg(serial->dev,
 327                                 usb_sndctrlpipe(serial->dev, 0),
 328                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 329                                 0, NULL, 0, 300);
 330         }
 331
 332         kfree(buf);
 333
 334         if ((size > 2 && result != size) || result < 0) {
 335                 dbg("%s - Unable to send request, "
 336                                 "request=0x%x size=%d result=%d\n",
 337                                 __func__, request, size, result);
 338                 if (result > 0)
 339                         result = -EPROTO;
 340
 341                 return result;
 342         }
 343
 344         return 0;
 345 }
 346
 347 /*
 348  * cp210x_set_config_single
 349  * Convenience function for calling cp210x_set_config on single data values
 350  * without requiring an integer pointer
 351  */
 352 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 353                 u8 request, unsigned int data)
 354 {
 355         return cp210x_set_config(port, request, &data, 2);
 356 }
 357
 358 /*
 359  * cp210x_quantise_baudrate
 360  * Quantises the baud rate as per AN205 Table 1
 361  */
 362 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 363         if      (baud <= 56)       baud = 0;
 364         else if (baud <= 300)      baud = 300;
 365         else if (baud <= 600)      baud = 600;
 366         else if (baud <= 1200)     baud = 1200;
 367         else if (baud <= 1800)     baud = 1800;
 368         else if (baud <= 2400)     baud = 2400;
 369         else if (baud <= 4000)     baud = 4000;
 370         else if (baud <= 4803)     baud = 4800;
 371         else if (baud <= 7207)     baud = 7200;
 372         else if (baud <= 9612)     baud = 9600;
 373         else if (baud <= 14428)    baud = 14400;
 374         else if (baud <= 16062)    baud = 16000;
 375         else if (baud <= 19250)    baud = 19200;
 376         else if (baud <= 28912)    baud = 28800;
 377         else if (baud <= 38601)    baud = 38400;
 378         else if (baud <= 51558)    baud = 51200;
 379         else if (baud <= 56280)    baud = 56000;
 380         else if (baud <= 58053)    baud = 57600;
 381         else if (baud <= 64111)    baud = 64000;
 382         else if (baud <= 77608)    baud = 76800;
 383         else if (baud <= 117028)   baud = 115200;
 384         else if (baud <= 129347)   baud = 128000;
 385         else if (baud <= 156868)   baud = 153600;
 386         else if (baud <= 237832)   baud = 230400;
 387         else if (baud <= 254234)   baud = 250000;
 388         else if (baud <= 273066)   baud = 256000;
 389         else if (baud <= 491520)   baud = 460800;
 390         else if (baud <= 567138)   baud = 500000;
 391         else if (baud <= 670254)   baud = 576000;
 392         else if (baud <= 1053257)  baud = 921600;
 393         else if (baud <= 1474560)  baud = 1228800;
 394         else if (baud <= 2457600)  baud = 1843200;
 395         else                       baud = 3686400;
 396         return baud;
 397 }
 398
 399 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 400 {
 401         int result;
 402
 403         dbg("%s - port %d", __func__, port->number);
 404
 405         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
 406                                                                 UART_ENABLE);
 407         if (result) {
 408                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 409                 return result;
 410         }
 411
 412         result = usb_serial_generic_open(tty, port);
 413         if (result)
 414                 return result;
 415
 416         /* Configure the termios structure */
 417         cp210x_get_termios(tty, port);
 418         return 0;
 419 }
 420
 421 static void cp210x_close(struct usb_serial_port *port)
 422 {
 423         dbg("%s - port %d", __func__, port->number);
 424
 425         usb_serial_generic_close(port);
 426
 427         mutex_lock(&port->serial->disc_mutex);
 428         if (!port->serial->disconnected)
 429                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 430         mutex_unlock(&port->serial->disc_mutex);
 431 }
 432
 433 /*
 434  * cp210x_get_termios
 435  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 436  * from the device, corrects any unsupported values, and configures the
 437  * termios structure to reflect the state of the device
 438  */
 439 static void cp210x_get_termios(struct tty_struct *tty,
 440         struct usb_serial_port *port)
 441 {
 442         unsigned int baud;
 443
 444         if (tty) {
 445                 cp210x_get_termios_port(tty->driver_data,
 446                         &tty->termios->c_cflag, &baud);
 447                 tty_encode_baud_rate(tty, baud, baud);
 448         }
 449
 450         else {
 451                 unsigned int cflag;
 452                 cflag = 0;
 453                 cp210x_get_termios_port(port, &cflag, &baud);
 454         }
 455 }
 456
 457 /*
 458  * cp210x_get_termios_port
 459  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 460  */
 461 static void cp210x_get_termios_port(struct usb_serial_port *port,
 462         unsigned int *cflagp, unsigned int *baudp)
 463 {
 464         unsigned int cflag, modem_ctl[4];
 465         unsigned int baud;
 466         unsigned int bits;
 467
 468         dbg("%s - port %d", __func__, port->number);
 469
 470         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 471         /* Convert to baudrate */
 472         if (baud)
 473                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 474
 475         dbg("%s - baud rate = %d", __func__, baud);
 476         *baudp = baud;
 477
 478         cflag = *cflagp;
 479
 480         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 481         cflag &= ~CSIZE;
 482         switch (bits & BITS_DATA_MASK) {
 483         case BITS_DATA_5:
 484                 dbg("%s - data bits = 5", __func__);
 485                 cflag |= CS5;
 486                 break;
 487         case BITS_DATA_6:
 488                 dbg("%s - data bits = 6", __func__);
 489                 cflag |= CS6;
 490                 break;
 491         case BITS_DATA_7:
 492                 dbg("%s - data bits = 7", __func__);
 493                 cflag |= CS7;
 494                 break;
 495         case BITS_DATA_8:
 496                 dbg("%s - data bits = 8", __func__);
 497                 cflag |= CS8;
 498                 break;
 499         case BITS_DATA_9:
 500                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 501                                                                 __func__);
 502                 cflag |= CS8;
 503                 bits &= ~BITS_DATA_MASK;
 504                 bits |= BITS_DATA_8;
 505                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 506                 break;
 507         default:
 508                 dbg("%s - Unknown number of data bits, using 8", __func__);
 509                 cflag |= CS8;
 510                 bits &= ~BITS_DATA_MASK;
 511                 bits |= BITS_DATA_8;
 512                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 513                 break;
 514         }
 515
 516         switch (bits & BITS_PARITY_MASK) {
 517         case BITS_PARITY_NONE:
 518                 dbg("%s - parity = NONE", __func__);
 519                 cflag &= ~PARENB;
 520                 break;
 521         case BITS_PARITY_ODD:
 522                 dbg("%s - parity = ODD", __func__);
 523                 cflag |= (PARENB|PARODD);
 524                 break;
 525         case BITS_PARITY_EVEN:
 526                 dbg("%s - parity = EVEN", __func__);
 527                 cflag &= ~PARODD;
 528                 cflag |= PARENB;
 529                 break;
 530         case BITS_PARITY_MARK:
 531                 dbg("%s - parity = MARK", __func__);
 532                 cflag |= (PARENB|PARODD|CMSPAR);
 533                 break;
 534         case BITS_PARITY_SPACE:
 535                 dbg("%s - parity = SPACE", __func__);
 536                 cflag &= ~PARODD;
 537                 cflag |= (PARENB|CMSPAR);
 538                 break;
 539         default:
 540                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 541                 cflag &= ~PARENB;
 542                 bits &= ~BITS_PARITY_MASK;
 543                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 544                 break;
 545         }
 546
 547         cflag &= ~CSTOPB;
 548         switch (bits & BITS_STOP_MASK) {
 549         case BITS_STOP_1:
 550                 dbg("%s - stop bits = 1", __func__);
 551                 break;
 552         case BITS_STOP_1_5:
 553                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 554                                                                 __func__);
 555                 bits &= ~BITS_STOP_MASK;
 556                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 557                 break;
 558         case BITS_STOP_2:
 559                 dbg("%s - stop bits = 2", __func__);
 560                 cflag |= CSTOPB;
 561                 break;
 562         default:
 563                 dbg("%s - Unknown number of stop bits, 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         }
 569
 570         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 571         if (modem_ctl[0] & 0x0008) {
 572                 dbg("%s - flow control = CRTSCTS", __func__);
 573                 cflag |= CRTSCTS;
 574         } else {
 575                 dbg("%s - flow control = NONE", __func__);
 576                 cflag &= ~CRTSCTS;
 577         }
 578
 579         *cflagp = cflag;
 580 }
 581
 582 static void cp210x_set_termios(struct tty_struct *tty,
 583                 struct usb_serial_port *port, struct ktermios *old_termios)
 584 {
 585         unsigned int cflag, old_cflag;
 586         unsigned int baud = 0, bits;
 587         unsigned int modem_ctl[4];
 588
 589         dbg("%s - port %d", __func__, port->number);
 590
 591         if (!tty)
 592                 return;
 593
 594         cflag = tty->termios->c_cflag;
 595         old_cflag = old_termios->c_cflag;
 596         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 597
 598         /* If the baud rate is to be updated*/
 599         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 600                 dbg("%s - Setting baud rate to %d baud", __func__,
 601                                 baud);
 602                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 603                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 604                         dbg("Baud rate requested not supported by device");
 605                         baud = tty_termios_baud_rate(old_termios);
 606                 }
 607         }
 608         /* Report back the resulting baud rate */
 609         tty_encode_baud_rate(tty, baud, baud);
 610
 611         /* If the number of data bits is to be updated */
 612         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 613                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 614                 bits &= ~BITS_DATA_MASK;
 615                 switch (cflag & CSIZE) {
 616                 case CS5:
 617                         bits |= BITS_DATA_5;
 618                         dbg("%s - data bits = 5", __func__);
 619                         break;
 620                 case CS6:
 621                         bits |= BITS_DATA_6;
 622                         dbg("%s - data bits = 6", __func__);
 623                         break;
 624                 case CS7:
 625                         bits |= BITS_DATA_7;
 626                         dbg("%s - data bits = 7", __func__);
 627                         break;
 628                 case CS8:
 629                         bits |= BITS_DATA_8;
 630                         dbg("%s - data bits = 8", __func__);
 631                         break;
 632                 /*case CS9:
 633                         bits |= BITS_DATA_9;
 634                         dbg("%s - data bits = 9", __func__);
 635                         break;*/
 636                 default:
 637                         dbg("cp210x driver does not "
 638                                         "support the number of bits requested,"
 639                                         " using 8 bit mode\n");
 640                                 bits |= BITS_DATA_8;
 641                                 break;
 642                 }
 643                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 644                         dbg("Number of data bits requested "
 645                                         "not supported by device\n");
 646         }
 647
 648         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 649             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 650                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 651                 bits &= ~BITS_PARITY_MASK;
 652                 if (cflag & PARENB) {
 653                         if (cflag & CMSPAR) {
 654                             if (cflag & PARODD) {
 655                                     bits |= BITS_PARITY_MARK;
 656                                     dbg("%s - parity = MARK", __func__);
 657                             } else {
 658                                     bits |= BITS_PARITY_SPACE;
 659                                     dbg("%s - parity = SPACE", __func__);
 660                             }
 661                         } else {
 662                             if (cflag & PARODD) {
 663                                     bits |= BITS_PARITY_ODD;
 664                                     dbg("%s - parity = ODD", __func__);
 665                             } else {
 666                                     bits |= BITS_PARITY_EVEN;
 667                                     dbg("%s - parity = EVEN", __func__);
 668                             }
 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,
 718                 unsigned int set, unsigned int clear)
 719 {
 720         struct usb_serial_port *port = tty->driver_data;
 721         return cp210x_tiocmset_port(port, set, clear);
 722 }
 723
 724 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 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, TIOCM_DTR|TIOCM_RTS, 0);
 757         else
 758                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 759 }
 760
 761 static int cp210x_tiocmget (struct tty_struct *tty)
 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 void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 784 {
 785         struct usb_serial_port *port = tty->driver_data;
 786         unsigned int state;
 787
 788         dbg("%s - port %d", __func__, port->number);
 789         if (break_state == 0)
 790                 state = BREAK_OFF;
 791         else
 792                 state = BREAK_ON;
 793         dbg("%s - turning break %s", __func__,
 794                         state == BREAK_OFF ? "off" : "on");
 795         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 796 }
 797
 798 static int cp210x_startup(struct usb_serial *serial)
 799 {
 800         /* cp210x buffers behave strangely unless device is reset */
 801         usb_reset_device(serial->dev);
 802         return 0;
 803 }
 804
 805 static int __init cp210x_init(void)
 806 {
 807         int retval;
 808
 809         retval = usb_serial_register(&cp210x_device);
 810         if (retval)
 811                 return retval; /* Failed to register */
 812
 813         retval = usb_register(&cp210x_driver);
 814         if (retval) {
 815                 /* Failed to register */
 816                 usb_serial_deregister(&cp210x_device);
 817                 return retval;
 818         }
 819
 820         /* Success */
 821         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 822                DRIVER_DESC "\n");
 823         return 0;
 824 }
 825
 826 static void __exit cp210x_exit(void)
 827 {
 828         usb_deregister(&cp210x_driver);
 829         usb_serial_deregister(&cp210x_device);
 830 }
 831
 832 module_init(cp210x_init);
 833 module_exit(cp210x_exit);
 834
 835 MODULE_DESCRIPTION(DRIVER_DESC);
 836 MODULE_VERSION(DRIVER_VERSION);
 837 MODULE_LICENSE("GPL");
 838
 839 module_param(debug, bool, S_IRUGO | S_IWUSR);
 840 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");