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 #define CP210X_GET_BAUDRATE     0x1D
 206 #define CP210X_SET_BAUDRATE     0x1E
 207
 208 /* CP210X_IFC_ENABLE */
 209 #define UART_ENABLE             0x0001
 210 #define UART_DISABLE            0x0000
 211
 212 /* CP210X_(SET|GET)_BAUDDIV */
 213 #define BAUD_RATE_GEN_FREQ      0x384000
 214
 215 /* CP210X_(SET|GET)_LINE_CTL */
 216 #define BITS_DATA_MASK          0X0f00
 217 #define BITS_DATA_5             0X0500
 218 #define BITS_DATA_6             0X0600
 219 #define BITS_DATA_7             0X0700
 220 #define BITS_DATA_8             0X0800
 221 #define BITS_DATA_9             0X0900
 222
 223 #define BITS_PARITY_MASK        0x00f0
 224 #define BITS_PARITY_NONE        0x0000
 225 #define BITS_PARITY_ODD         0x0010
 226 #define BITS_PARITY_EVEN        0x0020
 227 #define BITS_PARITY_MARK        0x0030
 228 #define BITS_PARITY_SPACE       0x0040
 229
 230 #define BITS_STOP_MASK          0x000f
 231 #define BITS_STOP_1             0x0000
 232 #define BITS_STOP_1_5           0x0001
 233 #define BITS_STOP_2             0x0002
 234
 235 /* CP210X_SET_BREAK */
 236 #define BREAK_ON                0x0001
 237 #define BREAK_OFF               0x0000
 238
 239 /* CP210X_(SET_MHS|GET_MDMSTS) */
 240 #define CONTROL_DTR             0x0001
 241 #define CONTROL_RTS             0x0002
 242 #define CONTROL_CTS             0x0010
 243 #define CONTROL_DSR             0x0020
 244 #define CONTROL_RING            0x0040
 245 #define CONTROL_DCD             0x0080
 246 #define CONTROL_WRITE_DTR       0x0100
 247 #define CONTROL_WRITE_RTS       0x0200
 248
 249 /*
 250  * cp210x_get_config
 251  * Reads from the CP210x configuration registers
 252  * 'size' is specified in bytes.
 253  * 'data' is a pointer to a pre-allocated array of integers large
 254  * enough to hold 'size' bytes (with 4 bytes to each integer)
 255  */
 256 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 257                 unsigned int *data, int size)
 258 {
 259         struct usb_serial *serial = port->serial;
 260         __le32 *buf;
 261         int result, i, length;
 262
 263         /* Number of integers required to contain the array */
 264         length = (((size - 1) | 3) + 1)/4;
 265
 266         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 267         if (!buf) {
 268                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 269                 return -ENOMEM;
 270         }
 271
 272         /* Issue the request, attempting to read 'size' bytes */
 273         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 274                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 275                                 0, buf, size, 300);
 276
 277         /* Convert data into an array of integers */
 278         for (i = 0; i < length; i++)
 279                 data[i] = le32_to_cpu(buf[i]);
 280
 281         kfree(buf);
 282
 283         if (result != size) {
 284                 dbg("%s - Unable to send config request, "
 285                                 "request=0x%x size=%d result=%d\n",
 286                                 __func__, request, size, result);
 287                 if (result > 0)
 288                         result = -EPROTO;
 289
 290                 return result;
 291         }
 292
 293         return 0;
 294 }
 295
 296 /*
 297  * cp210x_set_config
 298  * Writes to the CP210x configuration registers
 299  * Values less than 16 bits wide are sent directly
 300  * 'size' is specified in bytes.
 301  */
 302 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 303                 unsigned int *data, int size)
 304 {
 305         struct usb_serial *serial = port->serial;
 306         __le32 *buf;
 307         int result, i, length;
 308
 309         /* Number of integers required to contain the array */
 310         length = (((size - 1) | 3) + 1)/4;
 311
 312         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 313         if (!buf) {
 314                 dev_err(&port->dev, "%s - out of memory.\n",
 315                                 __func__);
 316                 return -ENOMEM;
 317         }
 318
 319         /* Array of integers into bytes */
 320         for (i = 0; i < length; i++)
 321                 buf[i] = cpu_to_le32(data[i]);
 322
 323         if (size > 2) {
 324                 result = usb_control_msg(serial->dev,
 325                                 usb_sndctrlpipe(serial->dev, 0),
 326                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 327                                 0, buf, size, 300);
 328         } else {
 329                 result = usb_control_msg(serial->dev,
 330                                 usb_sndctrlpipe(serial->dev, 0),
 331                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 332                                 0, NULL, 0, 300);
 333         }
 334
 335         kfree(buf);
 336
 337         if ((size > 2 && result != size) || result < 0) {
 338                 dbg("%s - Unable to send request, "
 339                                 "request=0x%x size=%d result=%d\n",
 340                                 __func__, request, size, result);
 341                 if (result > 0)
 342                         result = -EPROTO;
 343
 344                 return result;
 345         }
 346
 347         return 0;
 348 }
 349
 350 /*
 351  * cp210x_set_config_single
 352  * Convenience function for calling cp210x_set_config on single data values
 353  * without requiring an integer pointer
 354  */
 355 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 356                 u8 request, unsigned int data)
 357 {
 358         return cp210x_set_config(port, request, &data, 2);
 359 }
 360
 361 /*
 362  * cp210x_quantise_baudrate
 363  * Quantises the baud rate as per AN205 Table 1
 364  */
 365 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 366         if      (baud <= 56)       baud = 0;
 367         else if (baud <= 300)      baud = 300;
 368         else if (baud <= 600)      baud = 600;
 369         else if (baud <= 1200)     baud = 1200;
 370         else if (baud <= 1800)     baud = 1800;
 371         else if (baud <= 2400)     baud = 2400;
 372         else if (baud <= 4000)     baud = 4000;
 373         else if (baud <= 4803)     baud = 4800;
 374         else if (baud <= 7207)     baud = 7200;
 375         else if (baud <= 9612)     baud = 9600;
 376         else if (baud <= 14428)    baud = 14400;
 377         else if (baud <= 16062)    baud = 16000;
 378         else if (baud <= 19250)    baud = 19200;
 379         else if (baud <= 28912)    baud = 28800;
 380         else if (baud <= 38601)    baud = 38400;
 381         else if (baud <= 51558)    baud = 51200;
 382         else if (baud <= 56280)    baud = 56000;
 383         else if (baud <= 58053)    baud = 57600;
 384         else if (baud <= 64111)    baud = 64000;
 385         else if (baud <= 77608)    baud = 76800;
 386         else if (baud <= 117028)   baud = 115200;
 387         else if (baud <= 129347)   baud = 128000;
 388         else if (baud <= 156868)   baud = 153600;
 389         else if (baud <= 237832)   baud = 230400;
 390         else if (baud <= 254234)   baud = 250000;
 391         else if (baud <= 273066)   baud = 256000;
 392         else if (baud <= 491520)   baud = 460800;
 393         else if (baud <= 567138)   baud = 500000;
 394         else if (baud <= 670254)   baud = 576000;
 395         else if (baud <= 1053257)  baud = 921600;
 396         else if (baud <= 1474560)  baud = 1228800;
 397         else if (baud <= 2457600)  baud = 1843200;
 398         else                       baud = 3686400;
 399         return baud;
 400 }
 401
 402 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 403 {
 404         int result;
 405
 406         dbg("%s - port %d", __func__, port->number);
 407
 408         result = cp210x_set_config_single(port, CP210X_IFC_ENABLE,
 409                                                                 UART_ENABLE);
 410         if (result) {
 411                 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__);
 412                 return result;
 413         }
 414
 415         /* Configure the termios structure */
 416         cp210x_get_termios(tty, port);
 417
 418         return usb_serial_generic_open(tty, port);
 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_BAUDRATE, &baud, 4);
 471
 472         dbg("%s - baud rate = %d", __func__, baud);
 473         *baudp = baud;
 474
 475         cflag = *cflagp;
 476
 477         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 478         cflag &= ~CSIZE;
 479         switch (bits & BITS_DATA_MASK) {
 480         case BITS_DATA_5:
 481                 dbg("%s - data bits = 5", __func__);
 482                 cflag |= CS5;
 483                 break;
 484         case BITS_DATA_6:
 485                 dbg("%s - data bits = 6", __func__);
 486                 cflag |= CS6;
 487                 break;
 488         case BITS_DATA_7:
 489                 dbg("%s - data bits = 7", __func__);
 490                 cflag |= CS7;
 491                 break;
 492         case BITS_DATA_8:
 493                 dbg("%s - data bits = 8", __func__);
 494                 cflag |= CS8;
 495                 break;
 496         case BITS_DATA_9:
 497                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 498                                                                 __func__);
 499                 cflag |= CS8;
 500                 bits &= ~BITS_DATA_MASK;
 501                 bits |= BITS_DATA_8;
 502                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 503                 break;
 504         default:
 505                 dbg("%s - Unknown number of data bits, using 8", __func__);
 506                 cflag |= CS8;
 507                 bits &= ~BITS_DATA_MASK;
 508                 bits |= BITS_DATA_8;
 509                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 510                 break;
 511         }
 512
 513         switch (bits & BITS_PARITY_MASK) {
 514         case BITS_PARITY_NONE:
 515                 dbg("%s - parity = NONE", __func__);
 516                 cflag &= ~PARENB;
 517                 break;
 518         case BITS_PARITY_ODD:
 519                 dbg("%s - parity = ODD", __func__);
 520                 cflag |= (PARENB|PARODD);
 521                 break;
 522         case BITS_PARITY_EVEN:
 523                 dbg("%s - parity = EVEN", __func__);
 524                 cflag &= ~PARODD;
 525                 cflag |= PARENB;
 526                 break;
 527         case BITS_PARITY_MARK:
 528                 dbg("%s - parity = MARK", __func__);
 529                 cflag |= (PARENB|PARODD|CMSPAR);
 530                 break;
 531         case BITS_PARITY_SPACE:
 532                 dbg("%s - parity = SPACE", __func__);
 533                 cflag &= ~PARODD;
 534                 cflag |= (PARENB|CMSPAR);
 535                 break;
 536         default:
 537                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 538                 cflag &= ~PARENB;
 539                 bits &= ~BITS_PARITY_MASK;
 540                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 541                 break;
 542         }
 543
 544         cflag &= ~CSTOPB;
 545         switch (bits & BITS_STOP_MASK) {
 546         case BITS_STOP_1:
 547                 dbg("%s - stop bits = 1", __func__);
 548                 break;
 549         case BITS_STOP_1_5:
 550                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 551                                                                 __func__);
 552                 bits &= ~BITS_STOP_MASK;
 553                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 554                 break;
 555         case BITS_STOP_2:
 556                 dbg("%s - stop bits = 2", __func__);
 557                 cflag |= CSTOPB;
 558                 break;
 559         default:
 560                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 561                                                                 __func__);
 562                 bits &= ~BITS_STOP_MASK;
 563                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 564                 break;
 565         }
 566
 567         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 568         if (modem_ctl[0] & 0x0008) {
 569                 dbg("%s - flow control = CRTSCTS", __func__);
 570                 cflag |= CRTSCTS;
 571         } else {
 572                 dbg("%s - flow control = NONE", __func__);
 573                 cflag &= ~CRTSCTS;
 574         }
 575
 576         *cflagp = cflag;
 577 }
 578
 579 static void cp210x_set_termios(struct tty_struct *tty,
 580                 struct usb_serial_port *port, struct ktermios *old_termios)
 581 {
 582         unsigned int cflag, old_cflag;
 583         unsigned int baud = 0, bits;
 584         unsigned int modem_ctl[4];
 585
 586         dbg("%s - port %d", __func__, port->number);
 587
 588         if (!tty)
 589                 return;
 590
 591         cflag = tty->termios->c_cflag;
 592         old_cflag = old_termios->c_cflag;
 593         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 594
 595         /* If the baud rate is to be updated*/
 596         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 597                 dbg("%s - Setting baud rate to %d baud", __func__,
 598                                 baud);
 599                 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 4)) {
 600                         dbg("Baud rate requested not supported by device");
 601                         baud = tty_termios_baud_rate(old_termios);
 602                 }
 603         }
 604         /* Report back the resulting baud rate */
 605         tty_encode_baud_rate(tty, baud, baud);
 606
 607         /* If the number of data bits is to be updated */
 608         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 609                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 610                 bits &= ~BITS_DATA_MASK;
 611                 switch (cflag & CSIZE) {
 612                 case CS5:
 613                         bits |= BITS_DATA_5;
 614                         dbg("%s - data bits = 5", __func__);
 615                         break;
 616                 case CS6:
 617                         bits |= BITS_DATA_6;
 618                         dbg("%s - data bits = 6", __func__);
 619                         break;
 620                 case CS7:
 621                         bits |= BITS_DATA_7;
 622                         dbg("%s - data bits = 7", __func__);
 623                         break;
 624                 case CS8:
 625                         bits |= BITS_DATA_8;
 626                         dbg("%s - data bits = 8", __func__);
 627                         break;
 628                 /*case CS9:
 629                         bits |= BITS_DATA_9;
 630                         dbg("%s - data bits = 9", __func__);
 631                         break;*/
 632                 default:
 633                         dbg("cp210x driver does not "
 634                                         "support the number of bits requested,"
 635                                         " using 8 bit mode\n");
 636                                 bits |= BITS_DATA_8;
 637                                 break;
 638                 }
 639                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 640                         dbg("Number of data bits requested "
 641                                         "not supported by device\n");
 642         }
 643
 644         if ((cflag     & (PARENB|PARODD|CMSPAR)) !=
 645             (old_cflag & (PARENB|PARODD|CMSPAR))) {
 646                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 647                 bits &= ~BITS_PARITY_MASK;
 648                 if (cflag & PARENB) {
 649                         if (cflag & CMSPAR) {
 650                             if (cflag & PARODD) {
 651                                     bits |= BITS_PARITY_MARK;
 652                                     dbg("%s - parity = MARK", __func__);
 653                             } else {
 654                                     bits |= BITS_PARITY_SPACE;
 655                                     dbg("%s - parity = SPACE", __func__);
 656                             }
 657                         } else {
 658                             if (cflag & PARODD) {
 659                                     bits |= BITS_PARITY_ODD;
 660                                     dbg("%s - parity = ODD", __func__);
 661                             } else {
 662                                     bits |= BITS_PARITY_EVEN;
 663                                     dbg("%s - parity = EVEN", __func__);
 664                             }
 665                         }
 666                 }
 667                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 668                         dbg("Parity mode not supported "
 669                                         "by device\n");
 670         }
 671
 672         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 673                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 674                 bits &= ~BITS_STOP_MASK;
 675                 if (cflag & CSTOPB) {
 676                         bits |= BITS_STOP_2;
 677                         dbg("%s - stop bits = 2", __func__);
 678                 } else {
 679                         bits |= BITS_STOP_1;
 680                         dbg("%s - stop bits = 1", __func__);
 681                 }
 682                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 683                         dbg("Number of stop bits requested "
 684                                         "not supported by device\n");
 685         }
 686
 687         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 688                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 689                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 690                                 __func__, modem_ctl[0], modem_ctl[1],
 691                                 modem_ctl[2], modem_ctl[3]);
 692
 693                 if (cflag & CRTSCTS) {
 694                         modem_ctl[0] &= ~0x7B;
 695                         modem_ctl[0] |= 0x09;
 696                         modem_ctl[1] = 0x80;
 697                         dbg("%s - flow control = CRTSCTS", __func__);
 698                 } else {
 699                         modem_ctl[0] &= ~0x7B;
 700                         modem_ctl[0] |= 0x01;
 701                         modem_ctl[1] |= 0x40;
 702                         dbg("%s - flow control = NONE", __func__);
 703                 }
 704
 705                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 706                                 __func__, modem_ctl[0], modem_ctl[1],
 707                                 modem_ctl[2], modem_ctl[3]);
 708                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 709         }
 710
 711 }
 712
 713 static int cp210x_tiocmset (struct tty_struct *tty,
 714                 unsigned int set, unsigned int clear)
 715 {
 716         struct usb_serial_port *port = tty->driver_data;
 717         return cp210x_tiocmset_port(port, set, clear);
 718 }
 719
 720 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 721                 unsigned int set, unsigned int clear)
 722 {
 723         unsigned int control = 0;
 724
 725         dbg("%s - port %d", __func__, port->number);
 726
 727         if (set & TIOCM_RTS) {
 728                 control |= CONTROL_RTS;
 729                 control |= CONTROL_WRITE_RTS;
 730         }
 731         if (set & TIOCM_DTR) {
 732                 control |= CONTROL_DTR;
 733                 control |= CONTROL_WRITE_DTR;
 734         }
 735         if (clear & TIOCM_RTS) {
 736                 control &= ~CONTROL_RTS;
 737                 control |= CONTROL_WRITE_RTS;
 738         }
 739         if (clear & TIOCM_DTR) {
 740                 control &= ~CONTROL_DTR;
 741                 control |= CONTROL_WRITE_DTR;
 742         }
 743
 744         dbg("%s - control = 0x%.4x", __func__, control);
 745
 746         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 747 }
 748
 749 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 750 {
 751         if (on)
 752                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
 753         else
 754                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 755 }
 756
 757 static int cp210x_tiocmget (struct tty_struct *tty)
 758 {
 759         struct usb_serial_port *port = tty->driver_data;
 760         unsigned int control;
 761         int result;
 762
 763         dbg("%s - port %d", __func__, port->number);
 764
 765         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 766
 767         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 768                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 769                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 770                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 771                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 772                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 773
 774         dbg("%s - control = 0x%.2x", __func__, control);
 775
 776         return result;
 777 }
 778
 779 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 780 {
 781         struct usb_serial_port *port = tty->driver_data;
 782         unsigned int state;
 783
 784         dbg("%s - port %d", __func__, port->number);
 785         if (break_state == 0)
 786                 state = BREAK_OFF;
 787         else
 788                 state = BREAK_ON;
 789         dbg("%s - turning break %s", __func__,
 790                         state == BREAK_OFF ? "off" : "on");
 791         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 792 }
 793
 794 static int cp210x_startup(struct usb_serial *serial)
 795 {
 796         /* cp210x buffers behave strangely unless device is reset */
 797         usb_reset_device(serial->dev);
 798         return 0;
 799 }
 800
 801 static int __init cp210x_init(void)
 802 {
 803         int retval;
 804
 805         retval = usb_serial_register(&cp210x_device);
 806         if (retval)
 807                 return retval; /* Failed to register */
 808
 809         retval = usb_register(&cp210x_driver);
 810         if (retval) {
 811                 /* Failed to register */
 812                 usb_serial_deregister(&cp210x_device);
 813                 return retval;
 814         }
 815
 816         /* Success */
 817         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 818                DRIVER_DESC "\n");
 819         return 0;
 820 }
 821
 822 static void __exit cp210x_exit(void)
 823 {
 824         usb_deregister(&cp210x_driver);
 825         usb_serial_deregister(&cp210x_device);
 826 }
 827
 828 module_init(cp210x_init);
 829 module_exit(cp210x_exit);
 830
 831 MODULE_DESCRIPTION(DRIVER_DESC);
 832 MODULE_VERSION(DRIVER_VERSION);
 833 MODULE_LICENSE("GPL");
 834
 835 module_param(debug, bool, S_IRUGO | S_IWUSR);
 836 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");