SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/usb/serial/cp210x.c

   1 /*
   2  * Silicon Laboratories CP2101/CP2102 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 CP2101/CP2102 RS232 serial adaptor driver"
  32
  33 /*
  34  * Function Prototypes
  35  */
  36 static int cp2101_open(struct tty_struct *, struct usb_serial_port *,
  37                                                         struct file *);
  38 static void cp2101_cleanup(struct usb_serial_port *);
  39 static void cp2101_close(struct usb_serial_port *);
  40 static void cp2101_get_termios(struct tty_struct *,
  41         struct usb_serial_port *port);
  42 static void cp2101_get_termios_port(struct usb_serial_port *port,
  43         unsigned int *cflagp, unsigned int *baudp);
  44 static void cp2101_set_termios(struct tty_struct *, struct usb_serial_port *,
  45                                                         struct ktermios*);
  46 static int cp2101_tiocmget(struct tty_struct *, struct file *);
  47 static int cp2101_tiocmset(struct tty_struct *, struct file *,
  48                 unsigned int, unsigned int);
  49 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *,
  50                 unsigned int, unsigned int);
  51 static void cp2101_break_ctl(struct tty_struct *, int);
  52 static int cp2101_startup(struct usb_serial *);
  53 static void cp2101_shutdown(struct usb_serial *);
  54
  55 static int debug;
  56
  57 static struct usb_device_id id_table [] = {
  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(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */
  61         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  62         { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */
  63         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  64         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  65         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  66         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  67         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  68         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  69         { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */
  70         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  71         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  72         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  73         { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */
  74         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  75         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  76         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  77         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  78         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  79         { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */
  80         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  81         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  82         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  83         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  84         { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */
  85         { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */
  86         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  87         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  88         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  89         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  90         { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */
  91         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  92         { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */
  93         { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demostration module */
  94         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  95         { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */
  96         { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */
  97         { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */
  98         { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */
  99         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
 100         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
 101         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
 102         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
 103         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
 104         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
 105         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
 106         { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */
 107         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
 108         { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */
 109         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
 110         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
 111         { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */
 112         { } /* Terminating Entry */
 113 };
 114
 115 MODULE_DEVICE_TABLE(usb, id_table);
 116
 117 static struct usb_driver cp2101_driver = {
 118         .name           = "cp2101",
 119         .probe          = usb_serial_probe,
 120         .disconnect     = usb_serial_disconnect,
 121         .id_table       = id_table,
 122         .no_dynamic_id  =       1,
 123 };
 124
 125 static struct usb_serial_driver cp2101_device = {
 126         .driver = {
 127                 .owner =        THIS_MODULE,
 128                 .name =         "cp2101",
 129         },
 130         .usb_driver             = &cp2101_driver,
 131         .id_table               = id_table,
 132         .num_ports              = 1,
 133         .open                   = cp2101_open,
 134         .close                  = cp2101_close,
 135         .break_ctl              = cp2101_break_ctl,
 136         .set_termios            = cp2101_set_termios,
 137         .tiocmget               = cp2101_tiocmget,
 138         .tiocmset               = cp2101_tiocmset,
 139         .attach                 = cp2101_startup,
 140         .shutdown               = cp2101_shutdown,
 141 };
 142
 143 /* Config request types */
 144 #define REQTYPE_HOST_TO_DEVICE  0x41
 145 #define REQTYPE_DEVICE_TO_HOST  0xc1
 146
 147 /* Config request codes */
 148 #define CP210X_IFC_ENABLE       0x00
 149 #define CP210X_SET_BAUDDIV      0x01
 150 #define CP210X_GET_BAUDDIV      0x02
 151 #define CP210X_SET_LINE_CTL     0x03
 152 #define CP210X_GET_LINE_CTL     0x04
 153 #define CP210X_SET_BREAK        0x05
 154 #define CP210X_IMM_CHAR         0x06
 155 #define CP210X_SET_MHS          0x07
 156 #define CP210X_GET_MDMSTS       0x08
 157 #define CP210X_SET_XON          0x09
 158 #define CP210X_SET_XOFF         0x0A
 159 #define CP210X_SET_EVENTMASK    0x0B
 160 #define CP210X_GET_EVENTMASK    0x0C
 161 #define CP210X_SET_CHAR         0x0D
 162 #define CP210X_GET_CHARS        0x0E
 163 #define CP210X_GET_PROPS        0x0F
 164 #define CP210X_GET_COMM_STATUS  0x10
 165 #define CP210X_RESET            0x11
 166 #define CP210X_PURGE            0x12
 167 #define CP210X_SET_FLOW         0x13
 168 #define CP210X_GET_FLOW         0x14
 169 #define CP210X_EMBED_EVENTS     0x15
 170 #define CP210X_GET_EVENTSTATE   0x16
 171 #define CP210X_SET_CHARS        0x19
 172
 173 /* CP210X_IFC_ENABLE */
 174 #define UART_ENABLE             0x0001
 175 #define UART_DISABLE            0x0000
 176
 177 /* CP210X_(SET|GET)_BAUDDIV */
 178 #define BAUD_RATE_GEN_FREQ      0x384000
 179
 180 /* CP210X_(SET|GET)_LINE_CTL */
 181 #define BITS_DATA_MASK          0X0f00
 182 #define BITS_DATA_5             0X0500
 183 #define BITS_DATA_6             0X0600
 184 #define BITS_DATA_7             0X0700
 185 #define BITS_DATA_8             0X0800
 186 #define BITS_DATA_9             0X0900
 187
 188 #define BITS_PARITY_MASK        0x00f0
 189 #define BITS_PARITY_NONE        0x0000
 190 #define BITS_PARITY_ODD         0x0010
 191 #define BITS_PARITY_EVEN        0x0020
 192 #define BITS_PARITY_MARK        0x0030
 193 #define BITS_PARITY_SPACE       0x0040
 194
 195 #define BITS_STOP_MASK          0x000f
 196 #define BITS_STOP_1             0x0000
 197 #define BITS_STOP_1_5           0x0001
 198 #define BITS_STOP_2             0x0002
 199
 200 /* CP210X_SET_BREAK */
 201 #define BREAK_ON                0x0000
 202 #define BREAK_OFF               0x0001
 203
 204 /* CP210X_(SET_MHS|GET_MDMSTS) */
 205 #define CONTROL_DTR             0x0001
 206 #define CONTROL_RTS             0x0002
 207 #define CONTROL_CTS             0x0010
 208 #define CONTROL_DSR             0x0020
 209 #define CONTROL_RING            0x0040
 210 #define CONTROL_DCD             0x0080
 211 #define CONTROL_WRITE_DTR       0x0100
 212 #define CONTROL_WRITE_RTS       0x0200
 213
 214 /*
 215  * cp2101_get_config
 216  * Reads from the CP2101 configuration registers
 217  * 'size' is specified in bytes.
 218  * 'data' is a pointer to a pre-allocated array of integers large
 219  * enough to hold 'size' bytes (with 4 bytes to each integer)
 220  */
 221 static int cp2101_get_config(struct usb_serial_port *port, u8 request,
 222                 unsigned int *data, int size)
 223 {
 224         struct usb_serial *serial = port->serial;
 225         __le32 *buf;
 226         int result, i, length;
 227
 228         /* Number of integers required to contain the array */
 229         length = (((size - 1) | 3) + 1)/4;
 230
 231         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 232         if (!buf) {
 233                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 234                 return -ENOMEM;
 235         }
 236
 237         /* Issue the request, attempting to read 'size' bytes */
 238         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 239                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 240                                 0, buf, size, 300);
 241
 242         /* Convert data into an array of integers */
 243         for (i = 0; i < length; i++)
 244                 data[i] = le32_to_cpu(buf[i]);
 245
 246         kfree(buf);
 247
 248         if (result != size) {
 249                 dbg("%s - Unable to send config request, "
 250                                 "request=0x%x size=%d result=%d\n",
 251                                 __func__, request, size, result);
 252                 return -EPROTO;
 253         }
 254
 255         return 0;
 256 }
 257
 258 /*
 259  * cp2101_set_config
 260  * Writes to the CP2101 configuration registers
 261  * Values less than 16 bits wide are sent directly
 262  * 'size' is specified in bytes.
 263  */
 264 static int cp2101_set_config(struct usb_serial_port *port, u8 request,
 265                 unsigned int *data, int size)
 266 {
 267         struct usb_serial *serial = port->serial;
 268         __le32 *buf;
 269         int result, i, length;
 270
 271         /* Number of integers required to contain the array */
 272         length = (((size - 1) | 3) + 1)/4;
 273
 274         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 275         if (!buf) {
 276                 dev_err(&port->dev, "%s - out of memory.\n",
 277                                 __func__);
 278                 return -ENOMEM;
 279         }
 280
 281         /* Array of integers into bytes */
 282         for (i = 0; i < length; i++)
 283                 buf[i] = cpu_to_le32(data[i]);
 284
 285         if (size > 2) {
 286                 result = usb_control_msg(serial->dev,
 287                                 usb_sndctrlpipe(serial->dev, 0),
 288                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 289                                 0, buf, size, 300);
 290         } else {
 291                 result = usb_control_msg(serial->dev,
 292                                 usb_sndctrlpipe(serial->dev, 0),
 293                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 294                                 0, NULL, 0, 300);
 295         }
 296
 297         kfree(buf);
 298
 299         if ((size > 2 && result != size) || result < 0) {
 300                 dbg("%s - Unable to send request, "
 301                                 "request=0x%x size=%d result=%d\n",
 302                                 __func__, request, size, result);
 303                 return -EPROTO;
 304         }
 305
 306         /* Single data value */
 307         result = usb_control_msg(serial->dev,
 308                         usb_sndctrlpipe(serial->dev, 0),
 309                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 310                         0, NULL, 0, 300);
 311         return 0;
 312 }
 313
 314 /*
 315  * cp2101_set_config_single
 316  * Convenience function for calling cp2101_set_config on single data values
 317  * without requiring an integer pointer
 318  */
 319 static inline int cp2101_set_config_single(struct usb_serial_port *port,
 320                 u8 request, unsigned int data)
 321 {
 322         return cp2101_set_config(port, request, &data, 2);
 323 }
 324
 325 /*
 326  * cp2101_quantise_baudrate
 327  * Quantises the baud rate as per AN205 Table 1
 328  */
 329 static unsigned int cp2101_quantise_baudrate(unsigned int baud) {
 330         if      (baud <= 56)       baud = 0;
 331         else if (baud <= 300)      baud = 300;
 332         else if (baud <= 600)      baud = 600;
 333         else if (baud <= 1200)     baud = 1200;
 334         else if (baud <= 1800)     baud = 1800;
 335         else if (baud <= 2400)     baud = 2400;
 336         else if (baud <= 4000)     baud = 4000;
 337         else if (baud <= 4803)     baud = 4800;
 338         else if (baud <= 7207)     baud = 7200;
 339         else if (baud <= 9612)     baud = 9600;
 340         else if (baud <= 14428)    baud = 14400;
 341         else if (baud <= 16062)    baud = 16000;
 342         else if (baud <= 19250)    baud = 19200;
 343         else if (baud <= 28912)    baud = 28800;
 344         else if (baud <= 38601)    baud = 38400;
 345         else if (baud <= 51558)    baud = 51200;
 346         else if (baud <= 56280)    baud = 56000;
 347         else if (baud <= 58053)    baud = 57600;
 348         else if (baud <= 64111)    baud = 64000;
 349         else if (baud <= 77608)    baud = 76800;
 350         else if (baud <= 117028)   baud = 115200;
 351         else if (baud <= 129347)   baud = 128000;
 352         else if (baud <= 156868)   baud = 153600;
 353         else if (baud <= 237832)   baud = 230400;
 354         else if (baud <= 254234)   baud = 250000;
 355         else if (baud <= 273066)   baud = 256000;
 356         else if (baud <= 491520)   baud = 460800;
 357         else if (baud <= 567138)   baud = 500000;
 358         else if (baud <= 670254)   baud = 576000;
 359         else if (baud <= 1053257)  baud = 921600;
 360         else if (baud <= 1474560)  baud = 1228800;
 361         else if (baud <= 2457600)  baud = 1843200;
 362         else                       baud = 3686400;
 363         return baud;
 364 }
 365
 366 static int cp2101_open(struct tty_struct *tty, struct usb_serial_port *port,
 367                                 struct file *filp)
 368 {
 369         struct usb_serial *serial = port->serial;
 370         int result;
 371
 372         dbg("%s - port %d", __func__, port->number);
 373
 374         if (cp2101_set_config_single(port, CP210X_IFC_ENABLE, UART_ENABLE)) {
 375                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 376                                 __func__);
 377                 return -EPROTO;
 378         }
 379
 380         /* Start reading from the device */
 381         usb_fill_bulk_urb(port->read_urb, serial->dev,
 382                         usb_rcvbulkpipe(serial->dev,
 383                         port->bulk_in_endpointAddress),
 384                         port->read_urb->transfer_buffer,
 385                         port->read_urb->transfer_buffer_length,
 386                         serial->type->read_bulk_callback,
 387                         port);
 388         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 389         if (result) {
 390                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 391                                 "error %d\n", __func__, result);
 392                 return result;
 393         }
 394
 395         /* Configure the termios structure */
 396         cp2101_get_termios(tty, port);
 397
 398         /* Set the DTR and RTS pins low */
 399         cp2101_tiocmset_port(tty ? (struct usb_serial_port *) tty->driver_data
 400                         : port,
 401                 NULL, TIOCM_DTR | TIOCM_RTS, 0);
 402
 403         return 0;
 404 }
 405
 406 static void cp2101_cleanup(struct usb_serial_port *port)
 407 {
 408         struct usb_serial *serial = port->serial;
 409
 410         dbg("%s - port %d", __func__, port->number);
 411
 412         if (serial->dev) {
 413                 /* shutdown any bulk reads that might be going on */
 414                 if (serial->num_bulk_out)
 415                         usb_kill_urb(port->write_urb);
 416                 if (serial->num_bulk_in)
 417                         usb_kill_urb(port->read_urb);
 418         }
 419 }
 420
 421 static void cp2101_close(struct usb_serial_port *port)
 422 {
 423         dbg("%s - port %d", __func__, port->number);
 424
 425         /* shutdown our urbs */
 426         dbg("%s - shutting down urbs", __func__);
 427         usb_kill_urb(port->write_urb);
 428         usb_kill_urb(port->read_urb);
 429
 430         mutex_lock(&port->serial->disc_mutex);
 431         if (!port->serial->disconnected)
 432                 cp2101_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE);
 433         mutex_unlock(&port->serial->disc_mutex);
 434 }
 435
 436 /*
 437  * cp2101_get_termios
 438  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 439  * from the device, corrects any unsupported values, and configures the
 440  * termios structure to reflect the state of the device
 441  */
 442 static void cp2101_get_termios(struct tty_struct *tty,
 443         struct usb_serial_port *port)
 444 {
 445         unsigned int baud;
 446
 447         if (tty) {
 448                 cp2101_get_termios_port(tty->driver_data,
 449                         &tty->termios->c_cflag, &baud);
 450                 tty_encode_baud_rate(tty, baud, baud);
 451         }
 452
 453         else {
 454                 unsigned int cflag;
 455                 cflag = 0;
 456                 cp2101_get_termios_port(port, &cflag, &baud);
 457         }
 458 }
 459
 460 /*
 461  * cp2101_get_termios_port
 462  * This is the heart of cp2101_get_termios which always uses a &usb_serial_port.
 463  */
 464 static void cp2101_get_termios_port(struct usb_serial_port *port,
 465         unsigned int *cflagp, unsigned int *baudp)
 466 {
 467         unsigned int cflag, modem_ctl[4];
 468         unsigned int baud;
 469         unsigned int bits;
 470
 471         dbg("%s - port %d", __func__, port->number);
 472
 473         cp2101_get_config(port, CP210X_GET_BAUDDIV, &baud, 2);
 474         /* Convert to baudrate */
 475         if (baud)
 476                 baud = cp2101_quantise_baudrate((BAUD_RATE_GEN_FREQ + baud/2)/ baud);
 477
 478         dbg("%s - baud rate = %d", __func__, baud);
 479         *baudp = baud;
 480
 481         cflag = *cflagp;
 482
 483         cp2101_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 484         cflag &= ~CSIZE;
 485         switch (bits & BITS_DATA_MASK) {
 486         case BITS_DATA_5:
 487                 dbg("%s - data bits = 5", __func__);
 488                 cflag |= CS5;
 489                 break;
 490         case BITS_DATA_6:
 491                 dbg("%s - data bits = 6", __func__);
 492                 cflag |= CS6;
 493                 break;
 494         case BITS_DATA_7:
 495                 dbg("%s - data bits = 7", __func__);
 496                 cflag |= CS7;
 497                 break;
 498         case BITS_DATA_8:
 499                 dbg("%s - data bits = 8", __func__);
 500                 cflag |= CS8;
 501                 break;
 502         case BITS_DATA_9:
 503                 dbg("%s - data bits = 9 (not supported, using 8 data bits)",
 504                                                                 __func__);
 505                 cflag |= CS8;
 506                 bits &= ~BITS_DATA_MASK;
 507                 bits |= BITS_DATA_8;
 508                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 509                 break;
 510         default:
 511                 dbg("%s - Unknown number of data bits, using 8", __func__);
 512                 cflag |= CS8;
 513                 bits &= ~BITS_DATA_MASK;
 514                 bits |= BITS_DATA_8;
 515                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 516                 break;
 517         }
 518
 519         switch (bits & BITS_PARITY_MASK) {
 520         case BITS_PARITY_NONE:
 521                 dbg("%s - parity = NONE", __func__);
 522                 cflag &= ~PARENB;
 523                 break;
 524         case BITS_PARITY_ODD:
 525                 dbg("%s - parity = ODD", __func__);
 526                 cflag |= (PARENB|PARODD);
 527                 break;
 528         case BITS_PARITY_EVEN:
 529                 dbg("%s - parity = EVEN", __func__);
 530                 cflag &= ~PARODD;
 531                 cflag |= PARENB;
 532                 break;
 533         case BITS_PARITY_MARK:
 534                 dbg("%s - parity = MARK (not supported, disabling parity)",
 535                                 __func__);
 536                 cflag &= ~PARENB;
 537                 bits &= ~BITS_PARITY_MASK;
 538                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 539                 break;
 540         case BITS_PARITY_SPACE:
 541                 dbg("%s - parity = SPACE (not supported, disabling parity)",
 542                                 __func__);
 543                 cflag &= ~PARENB;
 544                 bits &= ~BITS_PARITY_MASK;
 545                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 546                 break;
 547         default:
 548                 dbg("%s - Unknown parity mode, disabling parity", __func__);
 549                 cflag &= ~PARENB;
 550                 bits &= ~BITS_PARITY_MASK;
 551                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 552                 break;
 553         }
 554
 555         cflag &= ~CSTOPB;
 556         switch (bits & BITS_STOP_MASK) {
 557         case BITS_STOP_1:
 558                 dbg("%s - stop bits = 1", __func__);
 559                 break;
 560         case BITS_STOP_1_5:
 561                 dbg("%s - stop bits = 1.5 (not supported, using 1 stop bit)",
 562                                                                 __func__);
 563                 bits &= ~BITS_STOP_MASK;
 564                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 565                 break;
 566         case BITS_STOP_2:
 567                 dbg("%s - stop bits = 2", __func__);
 568                 cflag |= CSTOPB;
 569                 break;
 570         default:
 571                 dbg("%s - Unknown number of stop bits, using 1 stop bit",
 572                                                                 __func__);
 573                 bits &= ~BITS_STOP_MASK;
 574                 cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2);
 575                 break;
 576         }
 577
 578         cp2101_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 579         if (modem_ctl[0] & 0x0008) {
 580                 dbg("%s - flow control = CRTSCTS", __func__);
 581                 cflag |= CRTSCTS;
 582         } else {
 583                 dbg("%s - flow control = NONE", __func__);
 584                 cflag &= ~CRTSCTS;
 585         }
 586
 587         *cflagp = cflag;
 588 }
 589
 590 static void cp2101_set_termios(struct tty_struct *tty,
 591                 struct usb_serial_port *port, struct ktermios *old_termios)
 592 {
 593         unsigned int cflag, old_cflag;
 594         unsigned int baud = 0, bits;
 595         unsigned int modem_ctl[4];
 596
 597         dbg("%s - port %d", __func__, port->number);
 598
 599         if (!tty)
 600                 return;
 601
 602         tty->termios->c_cflag &= ~CMSPAR;
 603         cflag = tty->termios->c_cflag;
 604         old_cflag = old_termios->c_cflag;
 605         baud = cp2101_quantise_baudrate(tty_get_baud_rate(tty));
 606
 607         /* If the baud rate is to be updated*/
 608         if (baud != tty_termios_baud_rate(old_termios) && baud != 0) {
 609                 dbg("%s - Setting baud rate to %d baud", __func__,
 610                                 baud);
 611                 if (cp2101_set_config_single(port, CP210X_SET_BAUDDIV,
 612                                         ((BAUD_RATE_GEN_FREQ + baud/2) / baud))) {
 613                         dbg("Baud rate requested not supported by device\n");
 614                         baud = tty_termios_baud_rate(old_termios);
 615                 }
 616         }
 617         /* Report back the resulting baud rate */
 618         tty_encode_baud_rate(tty, baud, baud);
 619
 620         /* If the number of data bits is to be updated */
 621         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 622                 cp2101_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 623                 bits &= ~BITS_DATA_MASK;
 624                 switch (cflag & CSIZE) {
 625                 case CS5:
 626                         bits |= BITS_DATA_5;
 627                         dbg("%s - data bits = 5", __func__);
 628                         break;
 629                 case CS6:
 630                         bits |= BITS_DATA_6;
 631                         dbg("%s - data bits = 6", __func__);
 632                         break;
 633                 case CS7:
 634                         bits |= BITS_DATA_7;
 635                         dbg("%s - data bits = 7", __func__);
 636                         break;
 637                 case CS8:
 638                         bits |= BITS_DATA_8;
 639                         dbg("%s - data bits = 8", __func__);
 640                         break;
 641                 /*case CS9:
 642                         bits |= BITS_DATA_9;
 643                         dbg("%s - data bits = 9", __func__);
 644                         break;*/
 645                 default:
 646                         dbg("cp2101 driver does not "
 647                                         "support the number of bits requested,"
 648                                         " using 8 bit mode\n");
 649                                 bits |= BITS_DATA_8;
 650                                 break;
 651                 }
 652                 if (cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 653                         dbg("Number of data bits requested "
 654                                         "not supported by device\n");
 655         }
 656
 657         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 658                 cp2101_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 659                 bits &= ~BITS_PARITY_MASK;
 660                 if (cflag & PARENB) {
 661                         if (cflag & PARODD) {
 662                                 bits |= BITS_PARITY_ODD;
 663                                 dbg("%s - parity = ODD", __func__);
 664                         } else {
 665                                 bits |= BITS_PARITY_EVEN;
 666                                 dbg("%s - parity = EVEN", __func__);
 667                         }
 668                 }
 669                 if (cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 670                         dbg("Parity mode not supported "
 671                                         "by device\n");
 672         }
 673
 674         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 675                 cp2101_get_config(port, CP210X_GET_LINE_CTL, &bits, 2);
 676                 bits &= ~BITS_STOP_MASK;
 677                 if (cflag & CSTOPB) {
 678                         bits |= BITS_STOP_2;
 679                         dbg("%s - stop bits = 2", __func__);
 680                 } else {
 681                         bits |= BITS_STOP_1;
 682                         dbg("%s - stop bits = 1", __func__);
 683                 }
 684                 if (cp2101_set_config(port, CP210X_SET_LINE_CTL, &bits, 2))
 685                         dbg("Number of stop bits requested "
 686                                         "not supported by device\n");
 687         }
 688
 689         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 690                 cp2101_get_config(port, CP210X_GET_FLOW, modem_ctl, 16);
 691                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 692                                 __func__, modem_ctl[0], modem_ctl[1],
 693                                 modem_ctl[2], modem_ctl[3]);
 694
 695                 if (cflag & CRTSCTS) {
 696                         modem_ctl[0] &= ~0x7B;
 697                         modem_ctl[0] |= 0x09;
 698                         modem_ctl[1] = 0x80;
 699                         dbg("%s - flow control = CRTSCTS", __func__);
 700                 } else {
 701                         modem_ctl[0] &= ~0x7B;
 702                         modem_ctl[0] |= 0x01;
 703                         modem_ctl[1] |= 0x40;
 704                         dbg("%s - flow control = NONE", __func__);
 705                 }
 706
 707                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 708                                 __func__, modem_ctl[0], modem_ctl[1],
 709                                 modem_ctl[2], modem_ctl[3]);
 710                 cp2101_set_config(port, CP210X_SET_FLOW, modem_ctl, 16);
 711         }
 712
 713 }
 714
 715 static int cp2101_tiocmset (struct tty_struct *tty, struct file *file,
 716                 unsigned int set, unsigned int clear)
 717 {
 718         struct usb_serial_port *port = tty->driver_data;
 719         return cp2101_tiocmset_port(port, file, set, clear);
 720 }
 721
 722 static int cp2101_tiocmset_port(struct usb_serial_port *port, struct file *file,
 723                 unsigned int set, unsigned int clear)
 724 {
 725         unsigned int control = 0;
 726
 727         dbg("%s - port %d", __func__, port->number);
 728
 729         if (set & TIOCM_RTS) {
 730                 control |= CONTROL_RTS;
 731                 control |= CONTROL_WRITE_RTS;
 732         }
 733         if (set & TIOCM_DTR) {
 734                 control |= CONTROL_DTR;
 735                 control |= CONTROL_WRITE_DTR;
 736         }
 737         if (clear & TIOCM_RTS) {
 738                 control &= ~CONTROL_RTS;
 739                 control |= CONTROL_WRITE_RTS;
 740         }
 741         if (clear & TIOCM_DTR) {
 742                 control &= ~CONTROL_DTR;
 743                 control |= CONTROL_WRITE_DTR;
 744         }
 745
 746         dbg("%s - control = 0x%.4x", __func__, control);
 747
 748         return cp2101_set_config(port, CP210X_SET_MHS, &control, 2);
 749 }
 750
 751 static int cp2101_tiocmget (struct tty_struct *tty, struct file *file)
 752 {
 753         struct usb_serial_port *port = tty->driver_data;
 754         unsigned int control;
 755         int result;
 756
 757         dbg("%s - port %d", __func__, port->number);
 758
 759         cp2101_get_config(port, CP210X_GET_MDMSTS, &control, 1);
 760
 761         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 762                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 763                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 764                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 765                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 766                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 767
 768         dbg("%s - control = 0x%.2x", __func__, control);
 769
 770         return result;
 771 }
 772
 773 static void cp2101_break_ctl (struct tty_struct *tty, int break_state)
 774 {
 775         struct usb_serial_port *port = tty->driver_data;
 776         unsigned int state;
 777
 778         dbg("%s - port %d", __func__, port->number);
 779         if (break_state == 0)
 780                 state = BREAK_OFF;
 781         else
 782                 state = BREAK_ON;
 783         dbg("%s - turning break %s", __func__,
 784                         state == BREAK_OFF ? "off" : "on");
 785         cp2101_set_config(port, CP210X_SET_BREAK, &state, 2);
 786 }
 787
 788 static int cp2101_startup(struct usb_serial *serial)
 789 {
 790         /* CP2101 buffers behave strangely unless device is reset */
 791         usb_reset_device(serial->dev);
 792         return 0;
 793 }
 794
 795 static void cp2101_shutdown(struct usb_serial *serial)
 796 {
 797         int i;
 798
 799         dbg("%s", __func__);
 800
 801         /* Stop reads and writes on all ports */
 802         for (i = 0; i < serial->num_ports; ++i)
 803                 cp2101_cleanup(serial->port[i]);
 804 }
 805
 806 static int __init cp2101_init(void)
 807 {
 808         int retval;
 809
 810         retval = usb_serial_register(&cp2101_device);
 811         if (retval)
 812                 return retval; /* Failed to register */
 813
 814         retval = usb_register(&cp2101_driver);
 815         if (retval) {
 816                 /* Failed to register */
 817                 usb_serial_deregister(&cp2101_device);
 818                 return retval;
 819         }
 820
 821         /* Success */
 822         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 823                DRIVER_DESC "\n");
 824         return 0;
 825 }
 826
 827 static void __exit cp2101_exit(void)
 828 {
 829         usb_deregister(&cp2101_driver);
 830         usb_serial_deregister(&cp2101_device);
 831 }
 832
 833 module_init(cp2101_init);
 834 module_exit(cp2101_exit);
 835
 836 MODULE_DESCRIPTION(DRIVER_DESC);
 837 MODULE_VERSION(DRIVER_VERSION);
 838 MODULE_LICENSE("GPL");
 839
 840 module_param(debug, bool, S_IRUGO | S_IWUSR);
 841 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");