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 *, struct file *);
  45 static int cp210x_tiocmset(struct tty_struct *, struct file *,
  46                 unsigned int, unsigned int);
  47 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *,
  48                 unsigned int, unsigned int);
  49 static void cp210x_break_ctl(struct tty_struct *, int);
  50 static int cp210x_startup(struct usb_serial *);
  51 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
  52 static int cp210x_carrier_raised(struct usb_serial_port *p);
  53
  54 static int debug;
  55
  56 static const struct usb_device_id id_table[] = {
  57         { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */
  58         { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */
  59         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  60         { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  61         { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  62         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  63         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  64         { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */
  65         { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */
  66         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  67         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  68         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  69         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  70         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  71         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  72         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  73         { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */
  74         { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */
  75         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  76         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  77         { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */
  78         { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */
  79         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  80         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  81         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  82         { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */
  83         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  84         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  85         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  86         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  87         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  88         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  89         { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */
  90         { USB_DEVICE(0x10C4, 0x8149) }, /* West Mountain Radio Computerized Battery Analyzer */
  91         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  92         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  93         { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */
  94         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  95         { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */
  96         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  97         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  98         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  99         { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */
 100         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
 101         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
 102         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
 103         { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */
 104         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
 105         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
 106         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
 107         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
 108         { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesys ETRX2USB */
 109         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
 110         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
 111         { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */
 112         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
 113         { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */
 114         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
 115         { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */
 116         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 117         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 118         { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */
 119         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 120         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 121         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 122         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 123         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 124         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 125         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 126         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 127         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 128         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 129         { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */
 130         { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */
 131         { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */
 132         { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */
 133         { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */
 134         { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */
 135         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 136         { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */
 137         { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */
 138         { } /* Terminating Entry */
 139 };
 140
 141 MODULE_DEVICE_TABLE(usb, id_table);
 142
 143 static struct usb_driver cp210x_driver = {
 144         .name           = "cp210x",
 145         .probe          = usb_serial_probe,
 146         .disconnect     = usb_serial_disconnect,
 147         .id_table       = id_table,
 148         .no_dynamic_id  =       1,
 149 };
 150
 151 static struct usb_serial_driver cp210x_device = {
 152         .driver = {
 153                 .owner =        THIS_MODULE,
 154                 .name =         "cp210x",
 155         },
 156         .usb_driver             = &cp210x_driver,
 157         .id_table               = id_table,
 158         .num_ports              = 1,
 159         .bulk_in_size           = 256,
 160         .bulk_out_size          = 256,
 161         .open                   = cp210x_open,
 162         .close                  = cp210x_close,
 163         .break_ctl              = cp210x_break_ctl,
 164         .set_termios            = cp210x_set_termios,
 165         .tiocmget               = cp210x_tiocmget,
 166         .tiocmset               = cp210x_tiocmset,
 167         .attach                 = cp210x_startup,
 168         .dtr_rts                = cp210x_dtr_rts,
 169         .carrier_raised         = cp210x_carrier_raised
 170 };
 171
 172 /* Config request types */
 173 #define REQTYPE_HOST_TO_DEVICE  0x41
 174 #define REQTYPE_DEVICE_TO_HOST  0xc1
 175
 176 /* Config request codes */
 177 #define CP210X_IFC_ENABLE       0x00
 178 #define CP210X_SET_BAUDDIV      0x01
 179 #define CP210X_GET_BAUDDIV      0x02
 180 #define CP210X_SET_LINE_CTL     0x03
 181 #define CP210X_GET_LINE_CTL     0x04
 182 #define CP210X_SET_BREAK        0x05
 183 #define CP210X_IMM_CHAR         0x06
 184 #define CP210X_SET_MHS          0x07
 185 #define CP210X_GET_MDMSTS       0x08
 186 #define CP210X_SET_XON          0x09
 187 #define CP210X_SET_XOFF         0x0A
 188 #define CP210X_SET_EVENTMASK    0x0B
 189 #define CP210X_GET_EVENTMASK    0x0C
 190 #define CP210X_SET_CHAR         0x0D
 191 #define CP210X_GET_CHARS        0x0E
 192 #define CP210X_GET_PROPS        0x0F
 193 #define CP210X_GET_COMM_STATUS  0x10
 194 #define CP210X_RESET            0x11
 195 #define CP210X_PURGE            0x12
 196 #define CP210X_SET_FLOW         0x13
 197 #define CP210X_GET_FLOW         0x14
 198 #define CP210X_EMBED_EVENTS     0x15
 199 #define CP210X_GET_EVENTSTATE   0x16
 200 #define CP210X_SET_CHARS        0x19
 201
 202 /* CP210X_IFC_ENABLE */
 203 #define UART_ENABLE             0x0001
 204 #define UART_DISABLE            0x0000
 205
 206 /* CP210X_(SET|GET)_BAUDDIV */
 207 #define BAUD_RATE_GEN_FREQ      0x384000
 208
 209 /* CP210X_(SET|GET)_LINE_CTL */
 210 #define BITS_DATA_MASK          0X0f00
 211 #define BITS_DATA_5             0X0500
 212 #define BITS_DATA_6             0X0600
 213 #define BITS_DATA_7             0X0700
 214 #define BITS_DATA_8             0X0800
 215 #define BITS_DATA_9             0X0900
 216
 217 #define BITS_PARITY_MASK        0x00f0
 218 #define BITS_PARITY_NONE        0x0000
 219 #define BITS_PARITY_ODD         0x0010
 220 #define BITS_PARITY_EVEN        0x0020
 221 #define BITS_PARITY_MARK        0x0030
 222 #define BITS_PARITY_SPACE       0x0040
 223
 224 #define BITS_STOP_MASK          0x000f
 225 #define BITS_STOP_1             0x0000
 226 #define BITS_STOP_1_5           0x0001
 227 #define BITS_STOP_2             0x0002
 228
 229 /* CP210X_SET_BREAK */
 230 #define BREAK_ON                0x0001
 231 #define BREAK_OFF               0x0000
 232
 233 /* CP210X_(SET_MHS|GET_MDMSTS) */
 234 #define CONTROL_DTR             0x0001
 235 #define CONTROL_RTS             0x0002
 236 #define CONTROL_CTS             0x0010
 237 #define CONTROL_DSR             0x0020
 238 #define CONTROL_RING            0x0040
 239 #define CONTROL_DCD             0x0080
 240 #define CONTROL_WRITE_DTR       0x0100
 241 #define CONTROL_WRITE_RTS       0x0200
 242
 243 /*
 244  * cp210x_get_config
 245  * Reads from the CP210x configuration registers
 246  * 'size' is specified in bytes.
 247  * 'data' is a pointer to a pre-allocated array of integers large
 248  * enough to hold 'size' bytes (with 4 bytes to each integer)
 249  */
 250 static int cp210x_get_config(struct usb_serial_port *port, u8 request,
 251                 unsigned int *data, int size)
 252 {
 253         struct usb_serial *serial = port->serial;
 254         __le32 *buf;
 255         int result, i, length;
 256
 257         /* Number of integers required to contain the array */
 258         length = (((size - 1) | 3) + 1)/4;
 259
 260         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 261         if (!buf) {
 262                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 263                 return -ENOMEM;
 264         }
 265
 266         /* Issue the request, attempting to read 'size' bytes */
 267         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 268                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 269                                 0, buf, size, 300);
 270
 271         /* Convert data into an array of integers */
 272         for (i = 0; i < length; i++)
 273                 data[i] = le32_to_cpu(buf[i]);
 274
 275         kfree(buf);
 276
 277         if (result != size) {
 278                 dbg("%s - Unable to send config request, "
 279                                 "request=0x%x size=%d result=%d\n",
 280                                 __func__, request, size, result);
 281                 return -EPROTO;
 282         }
 283
 284         return 0;
 285 }
 286
 287 /*
 288  * cp210x_set_config
 289  * Writes to the CP210x configuration registers
 290  * Values less than 16 bits wide are sent directly
 291  * 'size' is specified in bytes.
 292  */
 293 static int cp210x_set_config(struct usb_serial_port *port, u8 request,
 294                 unsigned int *data, int size)
 295 {
 296         struct usb_serial *serial = port->serial;
 297         __le32 *buf;
 298         int result, i, length;
 299
 300         /* Number of integers required to contain the array */
 301         length = (((size - 1) | 3) + 1)/4;
 302
 303         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 304         if (!buf) {
 305                 dev_err(&port->dev, "%s - out of memory.\n",
 306                                 __func__);
 307                 return -ENOMEM;
 308         }
 309
 310         /* Array of integers into bytes */
 311         for (i = 0; i < length; i++)
 312                 buf[i] = cpu_to_le32(data[i]);
 313
 314         if (size > 2) {
 315                 result = usb_control_msg(serial->dev,
 316                                 usb_sndctrlpipe(serial->dev, 0),
 317                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 318                                 0, buf, size, 300);
 319         } else {
 320                 result = usb_control_msg(serial->dev,
 321                                 usb_sndctrlpipe(serial->dev, 0),
 322                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 323                                 0, NULL, 0, 300);
 324         }
 325
 326         kfree(buf);
 327
 328         if ((size > 2 && result != size) || result < 0) {
 329                 dbg("%s - Unable to send request, "
 330                                 "request=0x%x size=%d result=%d\n",
 331                                 __func__, request, size, result);
 332                 return -EPROTO;
 333         }
 334
 335         return 0;
 336 }
 337
 338 /*
 339  * cp210x_set_config_single
 340  * Convenience function for calling cp210x_set_config on single data values
 341  * without requiring an integer pointer
 342  */
 343 static inline int cp210x_set_config_single(struct usb_serial_port *port,
 344                 u8 request, unsigned int data)
 345 {
 346         return cp210x_set_config(port, request, &data, 2);
 347 }
 348
 349 /*
 350  * cp210x_quantise_baudrate
 351  * Quantises the baud rate as per AN205 Table 1
 352  */
 353 static unsigned int cp210x_quantise_baudrate(unsigned int baud) {
 354         if      (baud <= 56)       baud = 0;
 355         else if (baud <= 300)      baud = 300;
 356         else if (baud <= 600)      baud = 600;
 357         else if (baud <= 1200)     baud = 1200;
 358         else if (baud <= 1800)     baud = 1800;
 359         else if (baud <= 2400)     baud = 2400;
 360         else if (baud <= 4000)     baud = 4000;
 361         else if (baud <= 4803)     baud = 4800;
 362         else if (baud <= 7207)     baud = 7200;
 363         else if (baud <= 9612)     baud = 9600;
 364         else if (baud <= 14428)    baud = 14400;
 365         else if (baud <= 16062)    baud = 16000;
 366         else if (baud <= 19250)    baud = 19200;
 367         else if (baud <= 28912)    baud = 28800;
 368         else if (baud <= 38601)    baud = 38400;
 369         else if (baud <= 51558)    baud = 51200;
 370         else if (baud <= 56280)    baud = 56000;
 371         else if (baud <= 58053)    baud = 57600;
 372         else if (baud <= 64111)    baud = 64000;
 373         else if (baud <= 77608)    baud = 76800;
 374         else if (baud <= 117028)   baud = 115200;
 375         else if (baud <= 129347)   baud = 128000;
 376         else if (baud <= 156868)   baud = 153600;
 377         else if (baud <= 237832)   baud = 230400;
 378         else if (baud <= 254234)   baud = 250000;
 379         else if (baud <= 273066)   baud = 256000;
 380         else if (baud <= 491520)   baud = 460800;
 381         else if (baud <= 567138)   baud = 500000;
 382         else if (baud <= 670254)   baud = 576000;
 383         else if (baud <= 1053257)  baud = 921600;
 384         else if (baud <= 1474560)  baud = 1228800;
 385         else if (baud <= 2457600)  baud = 1843200;
 386         else                       baud = 3686400;
 387         return baud;
 388 }
 389
 390 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 391 {
 392         int result;
 393
 394         dbg("%s - port %d", __func__, port->number);
 395
 396         if (cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
 397                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 398                                 __func__);
 399                 return -EPROTO;
 400         }
 401
 402         result = usb_serial_generic_open(tty, port);
 403         if (result)
 404                 return result;
 405
 406         /* Configure the termios structure */
 407         cp210x_get_termios(tty, port);
 408         return 0;
 409 }
 410
 411 static void cp210x_close(struct usb_serial_port *port)
 412 {
 413         dbg("%s - port %d", __func__, port->number);
 414
 415         usb_serial_generic_close(port);
 416
 417         mutex_lock(&port->serial->disc_mutex);
 418         if (!port->serial->disconnected)
 419                 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 420         mutex_unlock(&port->serial->disc_mutex);
 421 }
 422
 423 /*
 424  * cp210x_get_termios
 425  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 426  * from the device, corrects any unsupported values, and configures the
 427  * termios structure to reflect the state of the device
 428  */
 429 static void cp210x_get_termios(struct tty_struct *tty,
 430         struct usb_serial_port *port)
 431 {
 432         unsigned int baud;
 433
 434         if (tty) {
 435                 cp210x_get_termios_port(tty->driver_data,
 436                         &tty->termios->c_cflag, &baud);
 437                 tty_encode_baud_rate(tty, baud, baud);
 438         }
 439
 440         else {
 441                 unsigned int cflag;
 442                 cflag = 0;
 443                 cp210x_get_termios_port(port, &cflag, &baud);
 444         }
 445 }
 446
 447 /*
 448  * cp210x_get_termios_port
 449  * This is the heart of cp210x_get_termios which always uses a &usb_serial_port.
 450  */
 451 static void cp210x_get_termios_port(struct usb_serial_port *port,
 452         unsigned int *cflagp, unsigned int *baudp)
 453 {
 454         unsigned int cflag, modem_ctl[4];
 455         unsigned int baud;
 456         unsigned int bits;
 457
 458         dbg("%s - port %d", __func__, port->number);
 459
 460         cp210x_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 461         /* Convert to baudrate */
 462         if (baud)
 463                 baud = cp210x_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 464
 465         dbg("%s - baud rate = %d", __func__, baud);
 466         *baudp = baud;
 467
 468         cflag = *cflagp;
 469
 470         cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 471         cflag &= ~CSIZE;
 472         switch (bits & BITS_DATA_MASK) {
 473         case BITS_DATA_5:
 474                 dbg("%s - data bits = 5", __func__);
 475                 cflag |= CS5;
 476                 break;
 477         case BITS_DATA_6:
 478                 dbg("%s - data bits = 6", __func__);
 479                 cflag |= CS6;
 480                 break;
 481         case BITS_DATA_7:
 482                 dbg("%s - data bits = 7", __func__);
 483                 cflag |= CS7;
 484                 break;
 485         case BITS_DATA_8:
 486                 dbg("%s - data bits = 8", __func__);
 487                 cflag |= CS8;
 488                 break;
 489         case BITS_DATA_9:
 490                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 491                                                                 __func__);
 492                 cflag |= CS8;
 493                 bits &= ~BITS_DATA_MASK;
 494                 bits |= BITS_DATA_8;
 495                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 496                 break;
 497         default:
 498                 dbg("%s - Unknown number of data bits, using 8", __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         }
 505
 506         switch (bits & BITS_PARITY_MASK) {
 507         case BITS_PARITY_NONE:
 508                 dbg("%s - parity = NONE", __func__);
 509                 cflag &= ~PARENB;
 510                 break;
 511         case BITS_PARITY_ODD:
 512                 dbg("%s - parity = ODD", __func__);
 513                 cflag |= (PARENB|PARODD);
 514                 break;
 515         case BITS_PARITY_EVEN:
 516                 dbg("%s - parity = EVEN", __func__);
 517                 cflag &= ~PARODD;
 518                 cflag |= PARENB;
 519                 break;
 520         case BITS_PARITY_MARK:
 521                 dbg("%s - parity = MARK (not supported, disabling parity)",
 522                                 __func__);
 523                 cflag &= ~PARENB;
 524                 bits &= ~BITS_PARITY_MASK;
 525                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 526                 break;
 527         case BITS_PARITY_SPACE:
 528                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 529                                 __func__);
 530                 cflag &= ~PARENB;
 531                 bits &= ~BITS_PARITY_MASK;
 532                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 533                 break;
 534         default:
 535                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 536                 cflag &= ~PARENB;
 537                 bits &= ~BITS_PARITY_MASK;
 538                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 539                 break;
 540         }
 541
 542         cflag &= ~CSTOPB;
 543         switch (bits & BITS_STOP_MASK) {
 544         case BITS_STOP_1:
 545                 dbg("%s - stop bits = 1", __func__);
 546                 break;
 547         case BITS_STOP_1_5:
 548                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 549                                                                 __func__);
 550                 bits &= ~BITS_STOP_MASK;
 551                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 552                 break;
 553         case BITS_STOP_2:
 554                 dbg("%s - stop bits = 2", __func__);
 555                 cflag |= CSTOPB;
 556                 break;
 557         default:
 558                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 559                                                                 __func__);
 560                 bits &= ~BITS_STOP_MASK;
 561                 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 562                 break;
 563         }
 564
 565         cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 566         if (modem_ctl[0] & 0x0008) {
 567                 dbg("%s - flow control = CRTSCTS", __func__);
 568                 cflag |= CRTSCTS;
 569         } else {
 570                 dbg("%s - flow control = NONE", __func__);
 571                 cflag &= ~CRTSCTS;
 572         }
 573
 574         *cflagp = cflag;
 575 }
 576
 577 static void cp210x_set_termios(struct tty_struct *tty,
 578                 struct usb_serial_port *port, struct ktermios *old_termios)
 579 {
 580         unsigned int cflag, old_cflag;
 581         unsigned int baud = 0, bits;
 582         unsigned int modem_ctl[4];
 583
 584         dbg("%s - port %d", __func__, port->number);
 585
 586         if (!tty)
 587                 return;
 588
 589         tty->termios->c_cflag &= ~CMSPAR;
 590         cflag = tty->termios->c_cflag;
 591         old_cflag = old_termios->c_cflag;
 592         baud = cp210x_quantise_baudrate(tty_get_baud_rate(tty));
 593
 594         /* If the baud rate is to be updated*/
 595         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 596                 dbg("%s - Setting baud rate to %d baud", __func__,
 597                                 baud);
 598                 if (cp210x_set_config_single(port, CP210X_SET_BAUDDIV,
 599                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 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)) != (old_cflag & (PARENB|PARODD))) {
 645                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 646                 bits &= ~BITS_PARITY_MASK;
 647                 if (cflag & PARENB) {
 648                         if (cflag & PARODD) {
 649                                 bits |= BITS_PARITY_ODD;
 650                                 dbg("%s - parity = ODD", __func__);
 651                         } else {
 652                                 bits |= BITS_PARITY_EVEN;
 653                                 dbg("%s - parity = EVEN", __func__);
 654                         }
 655                 }
 656                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 657                         dbg("Parity mode not supported "
 658                                         "by device\n");
 659         }
 660
 661         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 662                 cp210x_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 663                 bits &= ~BITS_STOP_MASK;
 664                 if (cflag & CSTOPB) {
 665                         bits |= BITS_STOP_2;
 666                         dbg("%s - stop bits = 2", __func__);
 667                 } else {
 668                         bits |= BITS_STOP_1;
 669                         dbg("%s - stop bits = 1", __func__);
 670                 }
 671                 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 672                         dbg("Number of stop bits requested "
 673                                         "not supported by device\n");
 674         }
 675
 676         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 677                 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 678                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 679                                 __func__, modem_ctl[0], modem_ctl[1],
 680                                 modem_ctl[2], modem_ctl[3]);
 681
 682                 if (cflag & CRTSCTS) {
 683                         modem_ctl[0] &= ~0x7B;
 684                         modem_ctl[0] |= 0x09;
 685                         modem_ctl[1] = 0x80;
 686                         dbg("%s - flow control = CRTSCTS", __func__);
 687                 } else {
 688                         modem_ctl[0] &= ~0x7B;
 689                         modem_ctl[0] |= 0x01;
 690                         modem_ctl[1] |= 0x40;
 691                         dbg("%s - flow control = NONE", __func__);
 692                 }
 693
 694                 dbg("%s - write 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                 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 698         }
 699
 700 }
 701
 702 static int cp210x_tiocmset (struct tty_struct *tty, struct file *file,
 703                 unsigned int set, unsigned int clear)
 704 {
 705         struct usb_serial_port *port = tty->driver_data;
 706         return cp210x_tiocmset_port(port, file, set, clear);
 707 }
 708
 709 static int cp210x_tiocmset_port(struct usb_serial_port *port, struct file *file,
 710                 unsigned int set, unsigned int clear)
 711 {
 712         unsigned int control = 0;
 713
 714         dbg("%s - port %d", __func__, port->number);
 715
 716         if (set & TIOCM_RTS) {
 717                 control |= CONTROL_RTS;
 718                 control |= CONTROL_WRITE_RTS;
 719         }
 720         if (set & TIOCM_DTR) {
 721                 control |= CONTROL_DTR;
 722                 control |= CONTROL_WRITE_DTR;
 723         }
 724         if (clear & TIOCM_RTS) {
 725                 control &= ~CONTROL_RTS;
 726                 control |= CONTROL_WRITE_RTS;
 727         }
 728         if (clear & TIOCM_DTR) {
 729                 control &= ~CONTROL_DTR;
 730                 control |= CONTROL_WRITE_DTR;
 731         }
 732
 733         dbg("%s - control = 0x%.4x", __func__, control);
 734
 735         return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 736 }
 737
 738 static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
 739 {
 740         if (on)
 741                 cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
 742         else
 743                 cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
 744 }
 745
 746 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 747 {
 748         struct usb_serial_port *port = tty->driver_data;
 749         unsigned int control;
 750         int result;
 751
 752         dbg("%s - port %d", __func__, port->number);
 753
 754         cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 755
 756         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 757                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 758                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 759                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 760                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 761                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 762
 763         dbg("%s - control = 0x%.2x", __func__, control);
 764
 765         return result;
 766 }
 767
 768 static int cp210x_carrier_raised(struct usb_serial_port *p)
 769 {
 770         unsigned int control;
 771         cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
 772         if (control & CONTROL_DCD)
 773                 return 1;
 774         return 0;
 775 }
 776
 777 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 778 {
 779         struct usb_serial_port *port = tty->driver_data;
 780         unsigned int state;
 781
 782         dbg("%s - port %d", __func__, port->number);
 783         if (break_state == 0)
 784                 state = BREAK_OFF;
 785         else
 786                 state = BREAK_ON;
 787         dbg("%s - turning break %s", __func__,
 788                         state == BREAK_OFF ? "off" : "on");
 789         cp210x_set_config(port, CP210X_SET_BREAK, &state, 2);
 790 }
 791
 792 static int cp210x_startup(struct usb_serial *serial)
 793 {
 794         /* cp210x buffers behave strangely unless device is reset */
 795         usb_reset_device(serial->dev);
 796         return 0;
 797 }
 798
 799 static int __init cp210x_init(void)
 800 {
 801         int retval;
 802
 803         retval = usb_serial_register(&cp210x_device);
 804         if (retval)
 805                 return retval; /* Failed to register */
 806
 807         retval = usb_register(&cp210x_driver);
 808         if (retval) {
 809                 /* Failed to register */
 810                 usb_serial_deregister(&cp210x_device);
 811                 return retval;
 812         }
 813
 814         /* Success */
 815         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 816                DRIVER_DESC "\n");
 817         return 0;
 818 }
 819
 820 static void __exit cp210x_exit(void)
 821 {
 822         usb_deregister(&cp210x_driver);
 823         usb_serial_deregister(&cp210x_device);
 824 }
 825
 826 module_init(cp210x_init);
 827 module_exit(cp210x_exit);
 828
 829 MODULE_DESCRIPTION(DRIVER_DESC);
 830 MODULE_VERSION(DRIVER_VERSION);
 831 MODULE_LICENSE("GPL");
 832
 833 module_param(debug, bool, S_IRUGO | S_IWUSR);
 834 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");