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 bool 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(0x3195, 0xF190) }, /* Link Instruments MSO-19 */
 142         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 143         { } /* Terminating Entry */
 144 };
 145
 146 MODULE_DEVICE_TABLE(usb, id_table);
 147
 148 static struct usb_driver cp210x_driver = {
 149         .name           = "cp210x",
 150         .probe          = usb_serial_probe,
 151         .disconnect     = usb_serial_disconnect,
 152         .id_table       = id_table,
 153         .no_dynamic_id  =       1,
 154 };
 155
 156 static struct usb_serial_driver cp210x_device = {
 157         .driver = {
 158                 .owner =        THIS_MODULE,
 159                 .name =         "cp210x",
 160         },
 161         .usb_driver             = &cp210x_driver,
 162         .id_table               = id_table,
 163         .num_ports              = 1,
 164         .bulk_in_size           = 256,
 165         .bulk_out_size          = 256,
 166         .open                   = cp210x_open,
 167         .close                  = cp210x_close,
 168         .break_ctl              = cp210x_break_ctl,
 169         .set_termios            = cp210x_set_termios,
 170         .tiocmget               = cp210x_tiocmget,
 171         .tiocmset               = cp210x_tiocmset,
 172         .attach                 = cp210x_startup,
 173         .dtr_rts                = cp210x_dtr_rts
 174 };
 175
 176 /* Config request types */
 177 #define REQTYPE_HOST_TO_DEVICE  0x41
 178 #define REQTYPE_DEVICE_TO_HOST  0xc1
 179
 180 /* Config request codes */
 181 #define CP210X_IFC_ENABLE       0x00
 182 #define CP210X_SET_BAUDDIV      0x01
 183 #define CP210X_GET_BAUDDIV      0x02
 184 #define CP210X_SET_LINE_CTL     0x03
 185 #define CP210X_GET_LINE_CTL     0x04
 186 #define CP210X_SET_BREAK        0x05
 187 #define CP210X_IMM_CHAR         0x06
 188 #define CP210X_SET_MHS          0x07
 189 #define CP210X_GET_MDMSTS       0x08
 190 #define CP210X_SET_XON          0x09
 191 #define CP210X_SET_XOFF         0x0A
 192 #define CP210X_SET_EVENTMASK    0x0B
 193 #define CP210X_GET_EVENTMASK    0x0C
 194 #define CP210X_SET_CHAR         0x0D
 195 #define CP210X_GET_CHARS        0x0E
 196 #define CP210X_GET_PROPS        0x0F
 197 #define CP210X_GET_COMM_STATUS  0x10
 198 #define CP210X_RESET            0x11
 199 #define CP210X_PURGE            0x12
 200 #define CP210X_SET_FLOW         0x13
 201 #define CP210X_GET_FLOW         0x14
 202 #define CP210X_EMBED_EVENTS     0x15
 203 #define CP210X_GET_EVENTSTATE   0x16
 204 #define CP210X_SET_CHARS        0x19
 205
 206 /* CP210X_IFC_ENABLE */
 207 #define UART_ENABLE             0x0001
 208 #define UART_DISABLE            0x0000
 209
 210 /* CP210X_(SET|GET)_BAUDDIV */
 211 #define BAUD_RATE_GEN_FREQ      0x384000
 212
 213 /* CP210X_(SET|GET)_LINE_CTL */
 214 #define BITS_DATA_MASK          0X0f00
 215 #define BITS_DATA_5             0X0500
 216 #define BITS_DATA_6             0X0600
 217 #define BITS_DATA_7             0X0700
 218 #define BITS_DATA_8             0X0800
 219 #define BITS_DATA_9             0X0900
 220
 221 #define BITS_PARITY_MASK        0x00f0
 222 #define BITS_PARITY_NONE        0x0000
 223 #define BITS_PARITY_ODD         0x0010
 224 #define BITS_PARITY_EVEN        0x0020
 225 #define BITS_PARITY_MARK        0x0030
 226 #define BITS_PARITY_SPACE       0x0040
 227
 228 #define BITS_STOP_MASK          0x000f
 229 #define BITS_STOP_1             0x0000
 230 #define BITS_STOP_1_5           0x0001
 231 #define BITS_STOP_2             0x0002
 232
 233 /* CP210X_SET_BREAK */
 234 #define BREAK_ON                0x0001
 235 #define BREAK_OFF               0x0000
 236
 237 /* CP210X_(SET_MHS|GET_MDMSTS) */
 238 #define CONTROL_DTR             0x0001
 239 #define CONTROL_RTS             0x0002
 240 #define CONTROL_CTS             0x0010
 241 #define CONTROL_DSR             0x0020
 242 #define CONTROL_RING            0x0040
 243 #define CONTROL_DCD             0x0080
 244 #define CONTROL_WRITE_DTR       0x0100
 245 #define CONTROL_WRITE_RTS       0x0200
 246
 247 /*
 248  * cp210x_get_config
 249  * Reads from the CP210x configuration registers
 250  * 'size' is specified in bytes.
 251  * 'data' is a pointer to a pre-allocated array of integers large
 252  * enough to hold 'size' bytes (with 4 bytes to each integer)
 253  */
 254 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 255                 unsigned int *data, int size)
 256 {
 257         struct usb_serial *serial = port->serial;
 258         __le32 *buf;
 259         int result, i, length;
 260
 261         /* Number of integers required to contain the array */
 262         length = (((size - 1) | 3) + 1)/4;
 263
 264         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 265         if (!buf) {
 266                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 267                 return -ENOMEM;
 268         }
 269
 270         /* Issue the request, attempting to read 'size' bytes */
 271         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 272                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 273                                 0, buf, size, 300);
 274
 275         /* Convert data into an array of integers */
 276         for (i = 0; i < length; i++)
 277                 data[i] = le32_to_cpu(buf[i]);
 278
 279         kfree(buf);
 280
 281         if (result != size) {
 282                 dbg("%s - Unable to send config request, "
 283                                 "request=0x%x size=%d result=%d\n",
 284                                 __func__, request, size, result);
 285                 if (result > 0)
 286                         result = -EPROTO;
 287
 288                 return result;
 289         }
 290
 291         return 0;
 292 }
 293
 294 /*
 295  * cp210x_set_config
 296  * Writes to the CP210x configuration registers
 297  * Values less than 16 bits wide are sent directly
 298  * 'size' is specified in bytes.
 299  */
 300 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 301                 unsigned int *data, int size)
 302 {
 303         struct usb_serial *serial = port->serial;
 304         __le32 *buf;
 305         int result, i, length;
 306
 307         /* Number of integers required to contain the array */
 308         length = (((size - 1) | 3) + 1)/4;
 309
 310         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 311         if (!buf) {
 312                 dev_err(&port->dev, "%s - out of memory.\n",
 313                                 __func__);
 314                 return -ENOMEM;
 315         }
 316
 317         /* Array of integers into bytes */
 318         for (i = 0; i < length; i++)
 319                 buf[i] = cpu_to_le32(data[i]);
 320
 321         if (size > 2) {
 322                 result = usb_control_msg(serial->dev,
 323                                 usb_sndctrlpipe(serial->dev, 0),
 324                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 325                                 0, buf, size, 300);
 326         } else {
 327                 result = usb_control_msg(serial->dev,
 328                                 usb_sndctrlpipe(serial->dev, 0),
 329                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 330                                 0, NULL, 0, 300);
 331         }
 332
 333         kfree(buf);
 334
 335         if ((size > 2 && result != size) || result < 0) {
 336                 dbg("%s - Unable to send request, "
 337                                 "request=0x%x size=%d result=%d\n",
 338                                 __func__, request, size, result);
 339                 if (result > 0)
 340                         result = -EPROTO;
 341
 342                 return result;
 343         }
 344
 345         return 0;
 346 }
 347
 348 /*
 349  * cp210x_set_config_single
 350  * Convenience function for calling cp210x_set_config on single data values
 351  * without requiring an integer pointer
 352  */
 353 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 354                 u8 request, unsigned int data)
 355 {
 356         return cp210x_set_config(port, request, &data, 2);
 357 }
 358
 359 /*
 360  * cp210x_quantise_baudrate
 361  * Quantises the baud rate as per AN205 Table 1
 362  */
 363 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 364         if      (baud <= 56)       baud = 0;
 365         else if (baud <= 300)      baud = 300;
 366         else if (baud <= 600)      baud = 600;
 367         else if (baud <= 1200)     baud = 1200;
 368         else if (baud <= 1800)     baud = 1800;
 369         else if (baud <= 2400)     baud = 2400;
 370         else if (baud <= 4000)     baud = 4000;
 371         else if (baud <= 4803)     baud = 4800;
 372         else if (baud <= 7207)     baud = 7200;
 373         else if (baud <= 9612)     baud = 9600;
 374         else if (baud <= 14428)    baud = 14400;
 375         else if (baud <= 16062)    baud = 16000;
 376         else if (baud <= 19250)    baud = 19200;
 377         else if (baud <= 28912)    baud = 28800;
 378         else if (baud <= 38601)    baud = 38400;
 379         else if (baud <= 51558)    baud = 51200;
 380         else if (baud <= 56280)    baud = 56000;
 381         else if (baud <= 58053)    baud = 57600;
 382         else if (baud <= 64111)    baud = 64000;
 383         else if (baud <= 77608)    baud = 76800;
 384         else if (baud <= 117028)   baud = 115200;
 385         else if (baud <= 129347)   baud = 128000;
 386         else if (baud <= 156868)   baud = 153600;
 387         else if (baud <= 237832)   baud = 230400;
 388         else if (baud <= 254234)   baud = 250000;
 389         else if (baud <= 273066)   baud = 256000;
 390         else if (baud <= 491520)   baud = 460800;
 391         else if (baud <= 567138)   baud = 500000;
 392         else if (baud <= 670254)   baud = 576000;
 393         else if (baud <= 1053257)  baud = 921600;
 394         else if (baud <= 1474560)  baud = 1228800;
 395         else if (baud <= 2457600)  baud = 1843200;
 396         else                       baud = 3686400;
 397         return baud;
 398 }
 399
 400 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 401 {
 402         int result;
 403
 404         dbg("%s - port %d", __func__, port->number);
 405
 406         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
 407                                                                 UART_ENABLE);
 408         if (result) {
 409                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 410                 return result;
 411         }
 412
 413         result = usb_serial_generic_open(tty, port);
 414         if (result)
 415                 return result;
 416
 417         /* Configure the termios structure */
 418         cp210x_get_termios(tty, port);
 419         return 0;
 420 }
 421
 422 static void cp210x_close(struct usb_serial_port *port)
 423 {
 424         dbg("%s - port %d", __func__, port->number);
 425
 426         usb_serial_generic_close(port);
 427
 428         mutex_lock(&port->serial->disc_mutex);
 429         if (!port->serial->disconnected)
 430                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 431         mutex_unlock(&port->serial->disc_mutex);
 432 }
 433
 434 /*
 435  * cp210x_get_termios
 436  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 437  * from the device, corrects any unsupported values, and configures the
 438  * termios structure to reflect the state of the device
 439  */
 440 static void cp210x_get_termios(struct tty_struct *tty,
 441         struct usb_serial_port *port)
 442 {
 443         unsigned int baud;
 444
 445         if (tty) {
 446                 cp210x_get_termios_port(tty->driver_data,
 447                         &tty->termios->c_cflag, &baud);
 448                 tty_encode_baud_rate(tty, baud, baud);
 449         }
 450
 451         else {
 452                 unsigned int cflag;
 453                 cflag = 0;
 454                 cp210x_get_termios_port(port, &cflag, &baud);
 455         }
 456 }
 457
 458 /*
 459  * cp210x_get_termios_port
 460  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 461  */
 462 static void cp210x_get_termios_port(struct usb_serial_port *port,
 463         unsigned int *cflagp, unsigned int *baudp)
 464 {
 465         unsigned int cflag, modem_ctl[4];
 466         unsigned int baud;
 467         unsigned int bits;
 468
 469         dbg("%s - port %d", __func__, port->number);
 470
 471         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 472         /* Convert to baudrate */
 473         if (baud)
 474                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 475
 476         dbg("%s - baud rate = %d", __func__, baud);
 477         *baudp = baud;
 478
 479         cflag = *cflagp;
 480
 481         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 482         cflag &= ~CSIZE;
 483         switch (bits & BITS_DATA_MASK) {
 484         case BITS_DATA_5:
 485                 dbg("%s - data bits = 5", __func__);
 486                 cflag |= CS5;
 487                 break;
 488         case BITS_DATA_6:
 489                 dbg("%s - data bits = 6", __func__);
 490                 cflag |= CS6;
 491                 break;
 492         case BITS_DATA_7:
 493                 dbg("%s - data bits = 7", __func__);
 494                 cflag |= CS7;
 495                 break;
 496         case BITS_DATA_8:
 497                 dbg("%s - data bits = 8", __func__);
 498                 cflag |= CS8;
 499                 break;
 500         case BITS_DATA_9:
 501                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 502                                                                 __func__);
 503                 cflag |= CS8;
 504                 bits &= ~BITS_DATA_MASK;
 505                 bits |= BITS_DATA_8;
 506                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 507                 break;
 508         default:
 509                 dbg("%s - Unknown number of data bits, using 8", __func__);
 510                 cflag |= CS8;
 511                 bits &= ~BITS_DATA_MASK;
 512                 bits |= BITS_DATA_8;
 513                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 514                 break;
 515         }
 516
 517         switch (bits & BITS_PARITY_MASK) {
 518         case BITS_PARITY_NONE:
 519                 dbg("%s - parity = NONE", __func__);
 520                 cflag &= ~PARENB;
 521                 break;
 522         case BITS_PARITY_ODD:
 523                 dbg("%s - parity = ODD", __func__);
 524                 cflag |= (PARENB|PARODD);
 525                 break;
 526         case BITS_PARITY_EVEN:
 527                 dbg("%s - parity = EVEN", __func__);
 528                 cflag &= ~PARODD;
 529                 cflag |= PARENB;
 530                 break;
 531         case BITS_PARITY_MARK:
 532                 dbg("%s - parity = MARK", __func__);
 533                 cflag |= (PARENB|PARODD|CMSPAR);
 534                 break;
 535         case BITS_PARITY_SPACE:
 536                 dbg("%s - parity = SPACE", __func__);
 537                 cflag &= ~PARODD;
 538                 cflag |= (PARENB|CMSPAR);
 539                 break;
 540         default:
 541                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 542                 cflag &= ~PARENB;
 543                 bits &= ~BITS_PARITY_MASK;
 544                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 545                 break;
 546         }
 547
 548         cflag &= ~CSTOPB;
 549         switch (bits & BITS_STOP_MASK) {
 550         case BITS_STOP_1:
 551                 dbg("%s - stop bits = 1", __func__);
 552                 break;
 553         case BITS_STOP_1_5:
 554                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 555                                                                 __func__);
 556                 bits &= ~BITS_STOP_MASK;
 557                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 558                 break;
 559         case BITS_STOP_2:
 560                 dbg("%s - stop bits = 2", __func__);
 561                 cflag |= CSTOPB;
 562                 break;
 563         default:
 564                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 565                                                                 __func__);
 566                 bits &= ~BITS_STOP_MASK;
 567                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 568                 break;
 569         }
 570
 571         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 572         if (modem_ctl[0] & 0x0008) {
 573                 dbg("%s - flow control = CRTSCTS", __func__);
 574                 cflag |= CRTSCTS;
 575         } else {
 576                 dbg("%s - flow control = NONE", __func__);
 577                 cflag &= ~CRTSCTS;
 578         }
 579
 580         *cflagp = cflag;
 581 }
 582
 583 static void cp210x_set_termios(struct tty_struct *tty,
 584                 struct usb_serial_port *port, struct ktermios *old_termios)
 585 {
 586         unsigned int cflag, old_cflag;
 587         unsigned int baud = 0, bits;
 588         unsigned int modem_ctl[4];
 589
 590         dbg("%s - port %d", __func__, port->number);
 591
 592         if (!tty)
 593                 return;
 594
 595         cflag = tty->termios->c_cflag;
 596         old_cflag = old_termios->c_cflag;
 597         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 598
 599         /* If the baud rate is to be updated*/
 600         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 601                 dbg("%s - Setting baud rate to %d baud", __func__,
 602                                 baud);
 603                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 604                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 605                         dbg("Baud rate requested not supported by device");
 606                         baud = tty_termios_baud_rate(old_termios);
 607                 }
 608         }
 609         /* Report back the resulting baud rate */
 610         tty_encode_baud_rate(tty, baud, baud);
 611
 612         /* If the number of data bits is to be updated */
 613         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 614                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 615                 bits &= ~BITS_DATA_MASK;
 616                 switch (cflag & CSIZE) {
 617                 case CS5:
 618                         bits |= BITS_DATA_5;
 619                         dbg("%s - data bits = 5", __func__);
 620                         break;
 621                 case CS6:
 622                         bits |= BITS_DATA_6;
 623                         dbg("%s - data bits = 6", __func__);
 624                         break;
 625                 case CS7:
 626                         bits |= BITS_DATA_7;
 627                         dbg("%s - data bits = 7", __func__);
 628                         break;
 629                 case CS8:
 630                         bits |= BITS_DATA_8;
 631                         dbg("%s - data bits = 8", __func__);
 632                         break;
 633                 /*case CS9:
 634                         bits |= BITS_DATA_9;
 635                         dbg("%s - data bits = 9", __func__);
 636                         break;*/
 637                 default:
 638                         dbg("cp210x driver does not "
 639                                         "support the number of bits requested,"
 640                                         " using 8 bit mode\n");
 641                                 bits |= BITS_DATA_8;
 642                                 break;
 643                 }
 644                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 645                         dbg("Number of data bits requested "
 646                                         "not supported by device\n");
 647         }
 648
 649         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 650             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 651                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 652                 bits &= ~BITS_PARITY_MASK;
 653                 if (cflag & PARENB) {
 654                         if (cflag & CMSPAR) {
 655                             if (cflag & PARODD) {
 656                                     bits |= BITS_PARITY_MARK;
 657                                     dbg("%s - parity = MARK", __func__);
 658                             } else {
 659                                     bits |= BITS_PARITY_SPACE;
 660                                     dbg("%s - parity = SPACE", __func__);
 661                             }
 662                         } else {
 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                 }
 672                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 673                         dbg("Parity mode not supported "
 674                                         "by device\n");
 675         }
 676
 677         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 678                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 679                 bits &= ~BITS_STOP_MASK;
 680                 if (cflag & CSTOPB) {
 681                         bits |= BITS_STOP_2;
 682                         dbg("%s - stop bits = 2", __func__);
 683                 } else {
 684                         bits |= BITS_STOP_1;
 685                         dbg("%s - stop bits = 1", __func__);
 686                 }
 687                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 688                         dbg("Number of stop bits requested "
 689                                         "not supported by device\n");
 690         }
 691
 692         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 693                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 694                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 695                                 __func__, modem_ctl[0], modem_ctl[1],
 696                                 modem_ctl[2], modem_ctl[3]);
 697
 698                 if (cflag & CRTSCTS) {
 699                         modem_ctl[0] &= ~0x7B;
 700                         modem_ctl[0] |= 0x09;
 701                         modem_ctl[1] = 0x80;
 702                         dbg("%s - flow control = CRTSCTS", __func__);
 703                 } else {
 704                         modem_ctl[0] &= ~0x7B;
 705                         modem_ctl[0] |= 0x01;
 706                         modem_ctl[1] |= 0x40;
 707                         dbg("%s - flow control = NONE", __func__);
 708                 }
 709
 710                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 711                                 __func__, modem_ctl[0], modem_ctl[1],
 712                                 modem_ctl[2], modem_ctl[3]);
 713                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 714         }
 715
 716 }
 717
 718 static int cp210x_tiocmset (struct tty_struct *tty,
 719                 unsigned int set, unsigned int clear)
 720 {
 721         struct usb_serial_port *port = tty->driver_data;
 722         return cp210x_tiocmset_port(port, set, clear);
 723 }
 724
 725 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 726                 unsigned int set, unsigned int clear)
 727 {
 728         unsigned int control = 0;
 729
 730         dbg("%s - port %d", __func__, port->number);
 731
 732         if (set & TIOCM_RTS) {
 733                 control |= CONTROL_RTS;
 734                 control |= CONTROL_WRITE_RTS;
 735         }
 736         if (set & TIOCM_DTR) {
 737                 control |= CONTROL_DTR;
 738                 control |= CONTROL_WRITE_DTR;
 739         }
 740         if (clear & TIOCM_RTS) {
 741                 control &= ~CONTROL_RTS;
 742                 control |= CONTROL_WRITE_RTS;
 743         }
 744         if (clear & TIOCM_DTR) {
 745                 control &= ~CONTROL_DTR;
 746                 control |= CONTROL_WRITE_DTR;
 747         }
 748
 749         dbg("%s - control = 0x%.4x", __func__, control);
 750
 751         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 752 }
 753
 754 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 755 {
 756         if (on)
 757                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
 758         else
 759                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 760 }
 761
 762 static int cp210x_tiocmget (struct tty_struct *tty)
 763 {
 764         struct usb_serial_port *port = tty->driver_data;
 765         unsigned int control;
 766         int result;
 767
 768         dbg("%s - port %d", __func__, port->number);
 769
 770         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 771
 772         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 773                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 774                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 775                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 776                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 777                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 778
 779         dbg("%s - control = 0x%.2x", __func__, control);
 780
 781         return result;
 782 }
 783
 784 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 785 {
 786         struct usb_serial_port *port = tty->driver_data;
 787         unsigned int state;
 788
 789         dbg("%s - port %d", __func__, port->number);
 790         if (break_state == 0)
 791                 state = BREAK_OFF;
 792         else
 793                 state = BREAK_ON;
 794         dbg("%s - turning break %s", __func__,
 795                         state == BREAK_OFF ? "off" : "on");
 796         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 797 }
 798
 799 static int cp210x_startup(struct usb_serial *serial)
 800 {
 801         /* cp210x buffers behave strangely unless device is reset */
 802         usb_reset_device(serial->dev);
 803         return 0;
 804 }
 805
 806 static int __init cp210x_init(void)
 807 {
 808         int retval;
 809
 810         retval = usb_serial_register(&cp210x_device);
 811         if (retval)
 812                 return retval; /* Failed to register */
 813
 814         retval = usb_register(&cp210x_driver);
 815         if (retval) {
 816                 /* Failed to register */
 817                 usb_serial_deregister(&cp210x_device);
 818                 return retval;
 819         }
 820
 821         /* Success */
 822         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 823                DRIVER_DESC "\n");
 824         return 0;
 825 }
 826
 827 static void __exit cp210x_exit(void)
 828 {
 829         usb_deregister(&cp210x_driver);
 830         usb_serial_deregister(&cp210x_device);
 831 }
 832
 833 module_init(cp210x_init);
 834 module_exit(cp210x_exit);
 835
 836 MODULE_DESCRIPTION(DRIVER_DESC);
 837 MODULE_VERSION(DRIVER_VERSION);
 838 MODULE_LICENSE("GPL");
 839
 840 module_param(debug, bool, S_IRUGO | S_IWUSR);
 841 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");