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, 0x81AC) }, /* MSD Dash Hawk */
  96         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
  97         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  98         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  99         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 100         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 101         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 102         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 103         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 104         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */
 105         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */
 106         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 107         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 108         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 109         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 110         { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */
 111         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 112         { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */
 113         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 114         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 115         { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */
 116         { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */
 117         { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */
 118         { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */
 119         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 120         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 121         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 122         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 123         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 124         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 125         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 126         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 127         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 128         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 129         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 130         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 131         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 132         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 133         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 134         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 135         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 136         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 137         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 138         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 139         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 140         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 141         { } /* Terminating Entry */
 142 };
 143
 144 MODULE_DEVICE_TABLE(usb, id_table);
 145
 146 static struct usb_driver cp210x_driver = {
 147         .name           = "cp210x",
 148         .probe          = usb_serial_probe,
 149         .disconnect     = usb_serial_disconnect,
 150         .id_table       = id_table,
 151         .no_dynamic_id  =       1,
 152 };
 153
 154 static struct usb_serial_driver cp210x_device = {
 155         .driver = {
 156                 .owner =        THIS_MODULE,
 157                 .name =         "cp210x",
 158         },
 159         .usb_driver             = &cp210x_driver,
 160         .id_table               = id_table,
 161         .num_ports              = 1,
 162         .bulk_in_size           = 256,
 163         .bulk_out_size          = 256,
 164         .open                   = cp210x_open,
 165         .close                  = cp210x_close,
 166         .break_ctl              = cp210x_break_ctl,
 167         .set_termios            = cp210x_set_termios,
 168         .tiocmget               = cp210x_tiocmget,
 169         .tiocmset               = cp210x_tiocmset,
 170         .attach                 = cp210x_startup,
 171         .dtr_rts                = cp210x_dtr_rts
 172 };
 173
 174 /* Config request types */
 175 #define REQTYPE_HOST_TO_DEVICE  0x41
 176 #define REQTYPE_DEVICE_TO_HOST  0xc1
 177
 178 /* Config request codes */
 179 #define CP210X_IFC_ENABLE       0x00
 180 #define CP210X_SET_BAUDDIV      0x01
 181 #define CP210X_GET_BAUDDIV      0x02
 182 #define CP210X_SET_LINE_CTL     0x03
 183 #define CP210X_GET_LINE_CTL     0x04
 184 #define CP210X_SET_BREAK        0x05
 185 #define CP210X_IMM_CHAR         0x06
 186 #define CP210X_SET_MHS          0x07
 187 #define CP210X_GET_MDMSTS       0x08
 188 #define CP210X_SET_XON          0x09
 189 #define CP210X_SET_XOFF         0x0A
 190 #define CP210X_SET_EVENTMASK    0x0B
 191 #define CP210X_GET_EVENTMASK    0x0C
 192 #define CP210X_SET_CHAR         0x0D
 193 #define CP210X_GET_CHARS        0x0E
 194 #define CP210X_GET_PROPS        0x0F
 195 #define CP210X_GET_COMM_STATUS  0x10
 196 #define CP210X_RESET            0x11
 197 #define CP210X_PURGE            0x12
 198 #define CP210X_SET_FLOW         0x13
 199 #define CP210X_GET_FLOW         0x14
 200 #define CP210X_EMBED_EVENTS     0x15
 201 #define CP210X_GET_EVENTSTATE   0x16
 202 #define CP210X_SET_CHARS        0x19
 203
 204 /* CP210X_IFC_ENABLE */
 205 #define UART_ENABLE             0x0001
 206 #define UART_DISABLE            0x0000
 207
 208 /* CP210X_(SET|GET)_BAUDDIV */
 209 #define BAUD_RATE_GEN_FREQ      0x384000
 210
 211 /* CP210X_(SET|GET)_LINE_CTL */
 212 #define BITS_DATA_MASK          0X0f00
 213 #define BITS_DATA_5             0X0500
 214 #define BITS_DATA_6             0X0600
 215 #define BITS_DATA_7             0X0700
 216 #define BITS_DATA_8             0X0800
 217 #define BITS_DATA_9             0X0900
 218
 219 #define BITS_PARITY_MASK        0x00f0
 220 #define BITS_PARITY_NONE        0x0000
 221 #define BITS_PARITY_ODD         0x0010
 222 #define BITS_PARITY_EVEN        0x0020
 223 #define BITS_PARITY_MARK        0x0030
 224 #define BITS_PARITY_SPACE       0x0040
 225
 226 #define BITS_STOP_MASK          0x000f
 227 #define BITS_STOP_1             0x0000
 228 #define BITS_STOP_1_5           0x0001
 229 #define BITS_STOP_2             0x0002
 230
 231 /* CP210X_SET_BREAK */
 232 #define BREAK_ON                0x0001
 233 #define BREAK_OFF               0x0000
 234
 235 /* CP210X_(SET_MHS|GET_MDMSTS) */
 236 #define CONTROL_DTR             0x0001
 237 #define CONTROL_RTS             0x0002
 238 #define CONTROL_CTS             0x0010
 239 #define CONTROL_DSR             0x0020
 240 #define CONTROL_RING            0x0040
 241 #define CONTROL_DCD             0x0080
 242 #define CONTROL_WRITE_DTR       0x0100
 243 #define CONTROL_WRITE_RTS       0x0200
 244
 245 /*
 246  * cp210x_get_config
 247  * Reads from the CP210x configuration registers
 248  * 'size' is specified in bytes.
 249  * 'data' is a pointer to a pre-allocated array of integers large
 250  * enough to hold 'size' bytes (with 4 bytes to each integer)
 251  */
 252 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 253                 unsigned int *data, int size)
 254 {
 255         struct usb_serial *serial = port->serial;
 256         __le32 *buf;
 257         int result, i, length;
 258
 259         /* Number of integers required to contain the array */
 260         length = (((size - 1) | 3) + 1)/4;
 261
 262         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 263         if (!buf) {
 264                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 265                 return -ENOMEM;
 266         }
 267
 268         /* Issue the request, attempting to read 'size' bytes */
 269         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 270                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 271                                 0, buf, size, 300);
 272
 273         /* Convert data into an array of integers */
 274         for (i = 0; i < length; i++)
 275                 data[i] = le32_to_cpu(buf[i]);
 276
 277         kfree(buf);
 278
 279         if (result != size) {
 280                 dbg("%s - Unable to send config request, "
 281                                 "request=0x%x size=%d result=%d\n",
 282                                 __func__, request, size, result);
 283                 return -EPROTO;
 284         }
 285
 286         return 0;
 287 }
 288
 289 /*
 290  * cp210x_set_config
 291  * Writes to the CP210x configuration registers
 292  * Values less than 16 bits wide are sent directly
 293  * 'size' is specified in bytes.
 294  */
 295 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 296                 unsigned int *data, int size)
 297 {
 298         struct usb_serial *serial = port->serial;
 299         __le32 *buf;
 300         int result, i, length;
 301
 302         /* Number of integers required to contain the array */
 303         length = (((size - 1) | 3) + 1)/4;
 304
 305         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 306         if (!buf) {
 307                 dev_err(&port->dev, "%s - out of memory.\n",
 308                                 __func__);
 309                 return -ENOMEM;
 310         }
 311
 312         /* Array of integers into bytes */
 313         for (i = 0; i < length; i++)
 314                 buf[i] = cpu_to_le32(data[i]);
 315
 316         if (size > 2) {
 317                 result = usb_control_msg(serial->dev,
 318                                 usb_sndctrlpipe(serial->dev, 0),
 319                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 320                                 0, buf, size, 300);
 321         } else {
 322                 result = usb_control_msg(serial->dev,
 323                                 usb_sndctrlpipe(serial->dev, 0),
 324                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 325                                 0, NULL, 0, 300);
 326         }
 327
 328         kfree(buf);
 329
 330         if ((size > 2 && result != size) || result < 0) {
 331                 dbg("%s - Unable to send request, "
 332                                 "request=0x%x size=%d result=%d\n",
 333                                 __func__, request, size, result);
 334                 return -EPROTO;
 335         }
 336
 337         return 0;
 338 }
 339
 340 /*
 341  * cp210x_set_config_single
 342  * Convenience function for calling cp210x_set_config on single data values
 343  * without requiring an integer pointer
 344  */
 345 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 346                 u8 request, unsigned int data)
 347 {
 348         return cp210x_set_config(port, request, &data, 2);
 349 }
 350
 351 /*
 352  * cp210x_quantise_baudrate
 353  * Quantises the baud rate as per AN205 Table 1
 354  */
 355 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 356         if      (baud <= 56)       baud = 0;
 357         else if (baud <= 300)      baud = 300;
 358         else if (baud <= 600)      baud = 600;
 359         else if (baud <= 1200)     baud = 1200;
 360         else if (baud <= 1800)     baud = 1800;
 361         else if (baud <= 2400)     baud = 2400;
 362         else if (baud <= 4000)     baud = 4000;
 363         else if (baud <= 4803)     baud = 4800;
 364         else if (baud <= 7207)     baud = 7200;
 365         else if (baud <= 9612)     baud = 9600;
 366         else if (baud <= 14428)    baud = 14400;
 367         else if (baud <= 16062)    baud = 16000;
 368         else if (baud <= 19250)    baud = 19200;
 369         else if (baud <= 28912)    baud = 28800;
 370         else if (baud <= 38601)    baud = 38400;
 371         else if (baud <= 51558)    baud = 51200;
 372         else if (baud <= 56280)    baud = 56000;
 373         else if (baud <= 58053)    baud = 57600;
 374         else if (baud <= 64111)    baud = 64000;
 375         else if (baud <= 77608)    baud = 76800;
 376         else if (baud <= 117028)   baud = 115200;
 377         else if (baud <= 129347)   baud = 128000;
 378         else if (baud <= 156868)   baud = 153600;
 379         else if (baud <= 237832)   baud = 230400;
 380         else if (baud <= 254234)   baud = 250000;
 381         else if (baud <= 273066)   baud = 256000;
 382         else if (baud <= 491520)   baud = 460800;
 383         else if (baud <= 567138)   baud = 500000;
 384         else if (baud <= 670254)   baud = 576000;
 385         else if (baud <= 1053257)  baud = 921600;
 386         else if (baud <= 1474560)  baud = 1228800;
 387         else if (baud <= 2457600)  baud = 1843200;
 388         else                       baud = 3686400;
 389         return baud;
 390 }
 391
 392 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 393 {
 394         int result;
 395
 396         dbg("%s - port %d", __func__, port->number);
 397
 398         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
 399                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 400                                 __func__);
 401                 return -EPROTO;
 402         }
 403
 404         result = usb_serial_generic_open(tty, port);
 405         if (result)
 406                 return result;
 407
 408         /* Configure the termios structure */
 409         cp210x_get_termios(tty, port);
 410         return 0;
 411 }
 412
 413 static void cp210x_close(struct usb_serial_port *port)
 414 {
 415         dbg("%s - port %d", __func__, port->number);
 416
 417         usb_serial_generic_close(port);
 418
 419         mutex_lock(&port->serial->disc_mutex);
 420         if (!port->serial->disconnected)
 421                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 422         mutex_unlock(&port->serial->disc_mutex);
 423 }
 424
 425 /*
 426  * cp210x_get_termios
 427  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 428  * from the device, corrects any unsupported values, and configures the
 429  * termios structure to reflect the state of the device
 430  */
 431 static void cp210x_get_termios(struct tty_struct *tty,
 432         struct usb_serial_port *port)
 433 {
 434         unsigned int baud;
 435
 436         if (tty) {
 437                 cp210x_get_termios_port(tty->driver_data,
 438                         &tty->termios->c_cflag, &baud);
 439                 tty_encode_baud_rate(tty, baud, baud);
 440         }
 441
 442         else {
 443                 unsigned int cflag;
 444                 cflag = 0;
 445                 cp210x_get_termios_port(port, &cflag, &baud);
 446         }
 447 }
 448
 449 /*
 450  * cp210x_get_termios_port
 451  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 452  */
 453 static void cp210x_get_termios_port(struct usb_serial_port *port,
 454         unsigned int *cflagp, unsigned int *baudp)
 455 {
 456         unsigned int cflag, modem_ctl[4];
 457         unsigned int baud;
 458         unsigned int bits;
 459
 460         dbg("%s - port %d", __func__, port->number);
 461
 462         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 463         /* Convert to baudrate */
 464         if (baud)
 465                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 466
 467         dbg("%s - baud rate = %d", __func__, baud);
 468         *baudp = baud;
 469
 470         cflag = *cflagp;
 471
 472         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 473         cflag &= ~CSIZE;
 474         switch (bits & BITS_DATA_MASK) {
 475         case BITS_DATA_5:
 476                 dbg("%s - data bits = 5", __func__);
 477                 cflag |= CS5;
 478                 break;
 479         case BITS_DATA_6:
 480                 dbg("%s - data bits = 6", __func__);
 481                 cflag |= CS6;
 482                 break;
 483         case BITS_DATA_7:
 484                 dbg("%s - data bits = 7", __func__);
 485                 cflag |= CS7;
 486                 break;
 487         case BITS_DATA_8:
 488                 dbg("%s - data bits = 8", __func__);
 489                 cflag |= CS8;
 490                 break;
 491         case BITS_DATA_9:
 492                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 493                                                                 __func__);
 494                 cflag |= CS8;
 495                 bits &= ~BITS_DATA_MASK;
 496                 bits |= BITS_DATA_8;
 497                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 498                 break;
 499         default:
 500                 dbg("%s - Unknown number of data bits, using 8", __func__);
 501                 cflag |= CS8;
 502                 bits &= ~BITS_DATA_MASK;
 503                 bits |= BITS_DATA_8;
 504                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 505                 break;
 506         }
 507
 508         switch (bits & BITS_PARITY_MASK) {
 509         case BITS_PARITY_NONE:
 510                 dbg("%s - parity = NONE", __func__);
 511                 cflag &= ~PARENB;
 512                 break;
 513         case BITS_PARITY_ODD:
 514                 dbg("%s - parity = ODD", __func__);
 515                 cflag |= (PARENB|PARODD);
 516                 break;
 517         case BITS_PARITY_EVEN:
 518                 dbg("%s - parity = EVEN", __func__);
 519                 cflag &= ~PARODD;
 520                 cflag |= PARENB;
 521                 break;
 522         case BITS_PARITY_MARK:
 523                 dbg("%s - parity = MARK (not supported, disabling parity)",
 524                                 __func__);
 525                 cflag &= ~PARENB;
 526                 bits &= ~BITS_PARITY_MASK;
 527                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 528                 break;
 529         case BITS_PARITY_SPACE:
 530                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 531                                 __func__);
 532                 cflag &= ~PARENB;
 533                 bits &= ~BITS_PARITY_MASK;
 534                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 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         tty->termios->c_cflag &= ~CMSPAR;
 592         cflag = tty->termios->c_cflag;
 593         old_cflag = old_termios->c_cflag;
 594         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 595
 596         /* If the baud rate is to be updated*/
 597         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 598                 dbg("%s - Setting baud rate to %d baud", __func__,
 599                                 baud);
 600                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 601                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 602                         dbg("Baud rate requested not supported by device");
 603                         baud = tty_termios_baud_rate(old_termios);
 604                 }
 605         }
 606         /* Report back the resulting baud rate */
 607         tty_encode_baud_rate(tty, baud, baud);
 608
 609         /* If the number of data bits is to be updated */
 610         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 611                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 612                 bits &= ~BITS_DATA_MASK;
 613                 switch (cflag & CSIZE) {
 614                 case CS5:
 615                         bits |= BITS_DATA_5;
 616                         dbg("%s - data bits = 5", __func__);
 617                         break;
 618                 case CS6:
 619                         bits |= BITS_DATA_6;
 620                         dbg("%s - data bits = 6", __func__);
 621                         break;
 622                 case CS7:
 623                         bits |= BITS_DATA_7;
 624                         dbg("%s - data bits = 7", __func__);
 625                         break;
 626                 case CS8:
 627                         bits |= BITS_DATA_8;
 628                         dbg("%s - data bits = 8", __func__);
 629                         break;
 630                 /*case CS9:
 631                         bits |= BITS_DATA_9;
 632                         dbg("%s - data bits = 9", __func__);
 633                         break;*/
 634                 default:
 635                         dbg("cp210x driver does not "
 636                                         "support the number of bits requested,"
 637                                         " using 8 bit mode\n");
 638                                 bits |= BITS_DATA_8;
 639                                 break;
 640                 }
 641                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 642                         dbg("Number of data bits requested "
 643                                         "not supported by device\n");
 644         }
 645
 646         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 647                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 648                 bits &= ~BITS_PARITY_MASK;
 649                 if (cflag & PARENB) {
 650                         if (cflag & PARODD) {
 651                                 bits |= BITS_PARITY_ODD;
 652                                 dbg("%s - parity = ODD", __func__);
 653                         } else {
 654                                 bits |= BITS_PARITY_EVEN;
 655                                 dbg("%s - parity = EVEN", __func__);
 656                         }
 657                 }
 658                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 659                         dbg("Parity mode not supported "
 660                                         "by device\n");
 661         }
 662
 663         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 664                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 665                 bits &= ~BITS_STOP_MASK;
 666                 if (cflag & CSTOPB) {
 667                         bits |= BITS_STOP_2;
 668                         dbg("%s - stop bits = 2", __func__);
 669                 } else {
 670                         bits |= BITS_STOP_1;
 671                         dbg("%s - stop bits = 1", __func__);
 672                 }
 673                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 674                         dbg("Number of stop bits requested "
 675                                         "not supported by device\n");
 676         }
 677
 678         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 679                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 680                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 681                                 __func__, modem_ctl[0], modem_ctl[1],
 682                                 modem_ctl[2], modem_ctl[3]);
 683
 684                 if (cflag & CRTSCTS) {
 685                         modem_ctl[0] &= ~0x7B;
 686                         modem_ctl[0] |= 0x09;
 687                         modem_ctl[1] = 0x80;
 688                         dbg("%s - flow control = CRTSCTS", __func__);
 689                 } else {
 690                         modem_ctl[0] &= ~0x7B;
 691                         modem_ctl[0] |= 0x01;
 692                         modem_ctl[1] |= 0x40;
 693                         dbg("%s - flow control = NONE", __func__);
 694                 }
 695
 696                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 697                                 __func__, modem_ctl[0], modem_ctl[1],
 698                                 modem_ctl[2], modem_ctl[3]);
 699                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 700         }
 701
 702 }
 703
 704 static int cp210x_tiocmset (struct tty_struct *tty,
 705                 unsigned int set, unsigned int clear)
 706 {
 707         struct usb_serial_port *port = tty->driver_data;
 708         return cp210x_tiocmset_port(port, set, clear);
 709 }
 710
 711 static int cp210x_tiocmset_port(struct usb_serial_port *port,
 712                 unsigned int set, unsigned int clear)
 713 {
 714         unsigned int control = 0;
 715
 716         dbg("%s - port %d", __func__, port->number);
 717
 718         if (set & TIOCM_RTS) {
 719                 control |= CONTROL_RTS;
 720                 control |= CONTROL_WRITE_RTS;
 721         }
 722         if (set & TIOCM_DTR) {
 723                 control |= CONTROL_DTR;
 724                 control |= CONTROL_WRITE_DTR;
 725         }
 726         if (clear & TIOCM_RTS) {
 727                 control &= ~CONTROL_RTS;
 728                 control |= CONTROL_WRITE_RTS;
 729         }
 730         if (clear & TIOCM_DTR) {
 731                 control &= ~CONTROL_DTR;
 732                 control |= CONTROL_WRITE_DTR;
 733         }
 734
 735         dbg("%s - control = 0x%.4x", __func__, control);
 736
 737         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 738 }
 739
 740 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 741 {
 742         if (on)
 743                 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0);
 744         else
 745                 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS);
 746 }
 747
 748 static int cp210x_tiocmget (struct tty_struct *tty)
 749 {
 750         struct usb_serial_port *port = tty->driver_data;
 751         unsigned int control;
 752         int result;
 753
 754         dbg("%s - port %d", __func__, port->number);
 755
 756         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 757
 758         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 759                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 760                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 761                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 762                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 763                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 764
 765         dbg("%s - control = 0x%.2x", __func__, control);
 766
 767         return result;
 768 }
 769
 770 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 771 {
 772         struct usb_serial_port *port = tty->driver_data;
 773         unsigned int state;
 774
 775         dbg("%s - port %d", __func__, port->number);
 776         if (break_state == 0)
 777                 state = BREAK_OFF;
 778         else
 779                 state = BREAK_ON;
 780         dbg("%s - turning break %s", __func__,
 781                         state == BREAK_OFF ? "off" : "on");
 782         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 783 }
 784
 785 static int cp210x_startup(struct usb_serial *serial)
 786 {
 787         /* cp210x buffers behave strangely unless device is reset */
 788         usb_reset_device(serial->dev);
 789         return 0;
 790 }
 791
 792 static int __init cp210x_init(void)
 793 {
 794         int retval;
 795
 796         retval = usb_serial_register(&cp210x_device);
 797         if (retval)
 798                 return retval; /* Failed to register */
 799
 800         retval = usb_register(&cp210x_driver);
 801         if (retval) {
 802                 /* Failed to register */
 803                 usb_serial_deregister(&cp210x_device);
 804                 return retval;
 805         }
 806
 807         /* Success */
 808         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 809                DRIVER_DESC "\n");
 810         return 0;
 811 }
 812
 813 static void __exit cp210x_exit(void)
 814 {
 815         usb_deregister(&cp210x_driver);
 816         usb_serial_deregister(&cp210x_device);
 817 }
 818
 819 module_init(cp210x_init);
 820 module_exit(cp210x_exit);
 821
 822 MODULE_DESCRIPTION(DRIVER_DESC);
 823 MODULE_VERSION(DRIVER_VERSION);
 824 MODULE_LICENSE("GPL");
 825
 826 module_param(debug, bool, S_IRUGO | S_IWUSR);
 827 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");