err.no Git - linux-2.6/blob - drivers/usb/serial/cp2101.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  * Outstanding Issues:
  15  *  Buffers are not flushed when the port is opened.
  16  *  Multiple calls to write() may fail with "Resource temporarily unavailable"
  17  *
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/tty.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/usb.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/usb/serial.h>
  30
  31 /*
  32  * Version Information
  33  */
  34 #define DRIVER_VERSION "v0.07"
  35 #define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
  36
  37 /*
  38  * Function Prototypes
  39  */
  40 static int cp2101_open(struct usb_serial_port*, struct file*);
  41 static void cp2101_cleanup(struct usb_serial_port*);
  42 static void cp2101_close(struct usb_serial_port*, struct file*);
  43 static void cp2101_get_termios(struct usb_serial_port*);
  44 static void cp2101_set_termios(struct usb_serial_port*, struct ktermios*);
  45 static int cp2101_tiocmget (struct usb_serial_port *, struct file *);
  46 static int cp2101_tiocmset (struct usb_serial_port *, struct file *,
  47                 unsigned int, unsigned int);
  48 static void cp2101_break_ctl(struct usb_serial_port*, int);
  49 static int cp2101_startup (struct usb_serial *);
  50 static void cp2101_shutdown(struct usb_serial*);
  51
  52
  53 static int debug;
  54
  55 static struct usb_device_id id_table [] = {
  56         { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */
  57         { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */
  58         { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */
  59         { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */
  60         { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */
  61         { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */
  62         { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */
  63         { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */
  64         { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */
  65         { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */
  66         { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */
  67         { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */
  68         { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */
  69         { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */
  70         { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */
  71         { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */
  72         { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */
  73         { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */
  74         { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */
  75         { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */
  76         { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */
  77         { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */
  78         { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */
  79         { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */
  80         { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */
  81         { USB_DEVICE(0x10c4, 0x8293) }, /* Telegesys ETRX2USB */
  82         { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
  83         { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */
  84         { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */
  85         { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */
  86         { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */
  87         { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */
  88         { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */
  89         { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */
  90         { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */
  91         { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */
  92         { } /* Terminating Entry */
  93 };
  94
  95 MODULE_DEVICE_TABLE (usb, id_table);
  96
  97 static struct usb_driver cp2101_driver = {
  98         .name           = "cp2101",
  99         .probe          = usb_serial_probe,
 100         .disconnect     = usb_serial_disconnect,
 101         .id_table       = id_table,
 102         .no_dynamic_id  =       1,
 103 };
 104
 105 static struct usb_serial_driver cp2101_device = {
 106         .driver = {
 107                 .owner =        THIS_MODULE,
 108                 .name =         "cp2101",
 109         },
 110         .usb_driver             = &cp2101_driver,
 111         .id_table               = id_table,
 112         .num_interrupt_in       = 0,
 113         .num_bulk_in            = NUM_DONT_CARE,
 114         .num_bulk_out           = NUM_DONT_CARE,
 115         .num_ports              = 1,
 116         .open                   = cp2101_open,
 117         .close                  = cp2101_close,
 118         .break_ctl              = cp2101_break_ctl,
 119         .set_termios            = cp2101_set_termios,
 120         .tiocmget               = cp2101_tiocmget,
 121         .tiocmset               = cp2101_tiocmset,
 122         .attach                 = cp2101_startup,
 123         .shutdown               = cp2101_shutdown,
 124 };
 125
 126 /* Config request types */
 127 #define REQTYPE_HOST_TO_DEVICE  0x41
 128 #define REQTYPE_DEVICE_TO_HOST  0xc1
 129
 130 /* Config SET requests. To GET, add 1 to the request number */
 131 #define CP2101_UART             0x00    /* Enable / Disable */
 132 #define CP2101_BAUDRATE         0x01    /* (BAUD_RATE_GEN_FREQ / baudrate) */
 133 #define CP2101_BITS             0x03    /* 0x(0)(databits)(parity)(stopbits) */
 134 #define CP2101_BREAK            0x05    /* On / Off */
 135 #define CP2101_CONTROL          0x07    /* Flow control line states */
 136 #define CP2101_MODEMCTL         0x13    /* Modem controls */
 137 #define CP2101_CONFIG_6         0x19    /* 6 bytes of config data ??? */
 138
 139 /* CP2101_UART */
 140 #define UART_ENABLE             0x0001
 141 #define UART_DISABLE            0x0000
 142
 143 /* CP2101_BAUDRATE */
 144 #define BAUD_RATE_GEN_FREQ      0x384000
 145
 146 /* CP2101_BITS */
 147 #define BITS_DATA_MASK          0X0f00
 148 #define BITS_DATA_5             0X0500
 149 #define BITS_DATA_6             0X0600
 150 #define BITS_DATA_7             0X0700
 151 #define BITS_DATA_8             0X0800
 152 #define BITS_DATA_9             0X0900
 153
 154 #define BITS_PARITY_MASK        0x00f0
 155 #define BITS_PARITY_NONE        0x0000
 156 #define BITS_PARITY_ODD         0x0010
 157 #define BITS_PARITY_EVEN        0x0020
 158 #define BITS_PARITY_MARK        0x0030
 159 #define BITS_PARITY_SPACE       0x0040
 160
 161 #define BITS_STOP_MASK          0x000f
 162 #define BITS_STOP_1             0x0000
 163 #define BITS_STOP_1_5           0x0001
 164 #define BITS_STOP_2             0x0002
 165
 166 /* CP2101_BREAK */
 167 #define BREAK_ON                0x0000
 168 #define BREAK_OFF               0x0001
 169
 170 /* CP2101_CONTROL */
 171 #define CONTROL_DTR             0x0001
 172 #define CONTROL_RTS             0x0002
 173 #define CONTROL_CTS             0x0010
 174 #define CONTROL_DSR             0x0020
 175 #define CONTROL_RING            0x0040
 176 #define CONTROL_DCD             0x0080
 177 #define CONTROL_WRITE_DTR       0x0100
 178 #define CONTROL_WRITE_RTS       0x0200
 179
 180 /*
 181  * cp2101_get_config
 182  * Reads from the CP2101 configuration registers
 183  * 'size' is specified in bytes.
 184  * 'data' is a pointer to a pre-allocated array of integers large
 185  * enough to hold 'size' bytes (with 4 bytes to each integer)
 186  */
 187 static int cp2101_get_config(struct usb_serial_port* port, u8 request,
 188                 unsigned int *data, int size)
 189 {
 190         struct usb_serial *serial = port->serial;
 191         __le32 *buf;
 192         int result, i, length;
 193
 194         /* Number of integers required to contain the array */
 195         length = (((size - 1) | 3) + 1)/4;
 196
 197         buf = kcalloc(length, sizeof(__le32), GFP_KERNEL);
 198         if (!buf) {
 199                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 200                 return -ENOMEM;
 201         }
 202
 203         /* For get requests, the request number must be incremented */
 204         request++;
 205
 206         /* Issue the request, attempting to read 'size' bytes */
 207         result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
 208                                 request, REQTYPE_DEVICE_TO_HOST, 0x0000,
 209                                 0, buf, size, 300);
 210
 211         /* Convert data into an array of integers */
 212         for (i=0; i<length; i++)
 213                 data[i] = le32_to_cpu(buf[i]);
 214
 215         kfree(buf);
 216
 217         if (result != size) {
 218                 dev_err(&port->dev, "%s - Unable to send config request, "
 219                                 "request=0x%x size=%d result=%d\n",
 220                                 __FUNCTION__, request, size, result);
 221                 return -EPROTO;
 222         }
 223
 224         return 0;
 225 }
 226
 227 /*
 228  * cp2101_set_config
 229  * Writes to the CP2101 configuration registers
 230  * Values less than 16 bits wide are sent directly
 231  * 'size' is specified in bytes.
 232  */
 233 static int cp2101_set_config(struct usb_serial_port* port, u8 request,
 234                 unsigned int *data, int size)
 235 {
 236         struct usb_serial *serial = port->serial;
 237         __le32 *buf;
 238         int result, i, length;
 239
 240         /* Number of integers required to contain the array */
 241         length = (((size - 1) | 3) + 1)/4;
 242
 243         buf = kmalloc(length * sizeof(__le32), GFP_KERNEL);
 244         if (!buf) {
 245                 dev_err(&port->dev, "%s - out of memory.\n",
 246                                 __FUNCTION__);
 247                 return -ENOMEM;
 248         }
 249
 250         /* Array of integers into bytes */
 251         for (i = 0; i < length; i++)
 252                 buf[i] = cpu_to_le32(data[i]);
 253
 254         if (size > 2) {
 255                 result = usb_control_msg (serial->dev,
 256                                 usb_sndctrlpipe(serial->dev, 0),
 257                                 request, REQTYPE_HOST_TO_DEVICE, 0x0000,
 258                                 0, buf, size, 300);
 259         } else {
 260                 result = usb_control_msg (serial->dev,
 261                                 usb_sndctrlpipe(serial->dev, 0),
 262                                 request, REQTYPE_HOST_TO_DEVICE, data[0],
 263                                 0, NULL, 0, 300);
 264         }
 265
 266         kfree(buf);
 267
 268         if ((size > 2 && result != size) || result < 0) {
 269                 dev_err(&port->dev, "%s - Unable to send request, "
 270                                 "request=0x%x size=%d result=%d\n",
 271                                 __FUNCTION__, request, size, result);
 272                 return -EPROTO;
 273         }
 274
 275         /* Single data value */
 276         result = usb_control_msg (serial->dev,
 277                         usb_sndctrlpipe(serial->dev, 0),
 278                         request, REQTYPE_HOST_TO_DEVICE, data[0],
 279                         0, NULL, 0, 300);
 280         return 0;
 281 }
 282
 283 /*
 284  * cp2101_set_config_single
 285  * Convenience function for calling cp2101_set_config on single data values
 286  * without requiring an integer pointer
 287  */
 288 static inline int cp2101_set_config_single(struct usb_serial_port* port,
 289                 u8 request, unsigned int data)
 290 {
 291         return cp2101_set_config(port, request, &data, 2);
 292 }
 293
 294 static int cp2101_open (struct usb_serial_port *port, struct file *filp)
 295 {
 296         struct usb_serial *serial = port->serial;
 297         int result;
 298
 299         dbg("%s - port %d", __FUNCTION__, port->number);
 300
 301         if (cp2101_set_config_single(port, CP2101_UART, UART_ENABLE)) {
 302                 dev_err(&port->dev, "%s - Unable to enable UART\n",
 303                                 __FUNCTION__);
 304                 return -EPROTO;
 305         }
 306
 307         /* Start reading from the device */
 308         usb_fill_bulk_urb (port->read_urb, serial->dev,
 309                         usb_rcvbulkpipe(serial->dev,
 310                         port->bulk_in_endpointAddress),
 311                         port->read_urb->transfer_buffer,
 312                         port->read_urb->transfer_buffer_length,
 313                         serial->type->read_bulk_callback,
 314                         port);
 315         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 316         if (result) {
 317                 dev_err(&port->dev, "%s - failed resubmitting read urb, "
 318                                 "error %d\n", __FUNCTION__, result);
 319                 return result;
 320         }
 321
 322         /* Configure the termios structure */
 323         cp2101_get_termios(port);
 324
 325         /* Set the DTR and RTS pins low */
 326         cp2101_tiocmset(port, NULL, TIOCM_DTR | TIOCM_RTS, 0);
 327
 328         return 0;
 329 }
 330
 331 static void cp2101_cleanup (struct usb_serial_port *port)
 332 {
 333         struct usb_serial *serial = port->serial;
 334
 335         dbg("%s - port %d", __FUNCTION__, port->number);
 336
 337         if (serial->dev) {
 338                 /* shutdown any bulk reads that might be going on */
 339                 if (serial->num_bulk_out)
 340                         usb_kill_urb(port->write_urb);
 341                 if (serial->num_bulk_in)
 342                         usb_kill_urb(port->read_urb);
 343         }
 344 }
 345
 346 static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 347 {
 348         dbg("%s - port %d", __FUNCTION__, port->number);
 349
 350         /* shutdown our urbs */
 351         dbg("%s - shutting down urbs", __FUNCTION__);
 352         usb_kill_urb(port->write_urb);
 353         usb_kill_urb(port->read_urb);
 354
 355         mutex_lock(&port->serial->disc_mutex);
 356         if (!port->serial->disconnected)
 357                 cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
 358         mutex_unlock(&port->serial->disc_mutex);
 359 }
 360
 361 /*
 362  * cp2101_get_termios
 363  * Reads the baud rate, data bits, parity, stop bits and flow control mode
 364  * from the device, corrects any unsupported values, and configures the
 365  * termios structure to reflect the state of the device
 366  */
 367 static void cp2101_get_termios (struct usb_serial_port *port)
 368 {
 369         unsigned int cflag, modem_ctl[4];
 370         int baud;
 371         int bits;
 372
 373         dbg("%s - port %d", __FUNCTION__, port->number);
 374
 375         if (!port->tty || !port->tty->termios) {
 376                 dbg("%s - no tty structures", __FUNCTION__);
 377                 return;
 378         }
 379
 380         cp2101_get_config(port, CP2101_BAUDRATE, &baud, 2);
 381         /* Convert to baudrate */
 382         if (baud)
 383                 baud = BAUD_RATE_GEN_FREQ / baud;
 384
 385         dbg("%s - baud rate = %d", __FUNCTION__, baud);
 386
 387         tty_encode_baud_rate(port->tty, baud, baud);
 388         cflag = port->tty->termios->c_cflag;
 389
 390         cp2101_get_config(port, CP2101_BITS, &bits, 2);
 391         cflag &= ~CSIZE;
 392         switch(bits & BITS_DATA_MASK) {
 393                 case BITS_DATA_5:
 394                         dbg("%s - data bits = 5", __FUNCTION__);
 395                         cflag |= CS5;
 396                         break;
 397                 case BITS_DATA_6:
 398                         dbg("%s - data bits = 6", __FUNCTION__);
 399                         cflag |= CS6;
 400                         break;
 401                 case BITS_DATA_7:
 402                         dbg("%s - data bits = 7", __FUNCTION__);
 403                         cflag |= CS7;
 404                         break;
 405                 case BITS_DATA_8:
 406                         dbg("%s - data bits = 8", __FUNCTION__);
 407                         cflag |= CS8;
 408                         break;
 409                 case BITS_DATA_9:
 410                         dbg("%s - data bits = 9 (not supported, "
 411                                         "using 8 data bits)", __FUNCTION__);
 412                         cflag |= CS8;
 413                         bits &= ~BITS_DATA_MASK;
 414                         bits |= BITS_DATA_8;
 415                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 416                         break;
 417                 default:
 418                         dbg("%s - Unknown number of data bits, "
 419                                         "using 8", __FUNCTION__);
 420                         cflag |= CS8;
 421                         bits &= ~BITS_DATA_MASK;
 422                         bits |= BITS_DATA_8;
 423                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 424                         break;
 425         }
 426
 427         switch(bits & BITS_PARITY_MASK) {
 428                 case BITS_PARITY_NONE:
 429                         dbg("%s - parity = NONE", __FUNCTION__);
 430                         cflag &= ~PARENB;
 431                         break;
 432                 case BITS_PARITY_ODD:
 433                         dbg("%s - parity = ODD", __FUNCTION__);
 434                         cflag |= (PARENB|PARODD);
 435                         break;
 436                 case BITS_PARITY_EVEN:
 437                         dbg("%s - parity = EVEN", __FUNCTION__);
 438                         cflag &= ~PARODD;
 439                         cflag |= PARENB;
 440                         break;
 441                 case BITS_PARITY_MARK:
 442                         dbg("%s - parity = MARK (not supported, "
 443                                         "disabling parity)", __FUNCTION__);
 444                         cflag &= ~PARENB;
 445                         bits &= ~BITS_PARITY_MASK;
 446                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 447                         break;
 448                 case BITS_PARITY_SPACE:
 449                         dbg("%s - parity = SPACE (not supported, "
 450                                         "disabling parity)", __FUNCTION__);
 451                         cflag &= ~PARENB;
 452                         bits &= ~BITS_PARITY_MASK;
 453                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 454                         break;
 455                 default:
 456                         dbg("%s - Unknown parity mode, "
 457                                         "disabling parity", __FUNCTION__);
 458                         cflag &= ~PARENB;
 459                         bits &= ~BITS_PARITY_MASK;
 460                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 461                         break;
 462         }
 463
 464         cflag &= ~CSTOPB;
 465         switch(bits & BITS_STOP_MASK) {
 466                 case BITS_STOP_1:
 467                         dbg("%s - stop bits = 1", __FUNCTION__);
 468                         break;
 469                 case BITS_STOP_1_5:
 470                         dbg("%s - stop bits = 1.5 (not supported, "
 471                                         "using 1 stop bit)", __FUNCTION__);
 472                         bits &= ~BITS_STOP_MASK;
 473                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 474                         break;
 475                 case BITS_STOP_2:
 476                         dbg("%s - stop bits = 2", __FUNCTION__);
 477                         cflag |= CSTOPB;
 478                         break;
 479                 default:
 480                         dbg("%s - Unknown number of stop bits, "
 481                                         "using 1 stop bit", __FUNCTION__);
 482                         bits &= ~BITS_STOP_MASK;
 483                         cp2101_set_config(port, CP2101_BITS, &bits, 2);
 484                         break;
 485         }
 486
 487         cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 488         if (modem_ctl[0] & 0x0008) {
 489                 dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 490                 cflag |= CRTSCTS;
 491         } else {
 492                 dbg("%s - flow control = NONE", __FUNCTION__);
 493                 cflag &= ~CRTSCTS;
 494         }
 495
 496         port->tty->termios->c_cflag = cflag;
 497 }
 498
 499 static void cp2101_set_termios (struct usb_serial_port *port,
 500                 struct ktermios *old_termios)
 501 {
 502         unsigned int cflag, old_cflag;
 503         int baud=0, bits;
 504         unsigned int modem_ctl[4];
 505
 506         dbg("%s - port %d", __FUNCTION__, port->number);
 507
 508         if (!port->tty || !port->tty->termios) {
 509                 dbg("%s - no tty structures", __FUNCTION__);
 510                 return;
 511         }
 512         port->tty->termios->c_cflag &= ~CMSPAR;
 513
 514         cflag = port->tty->termios->c_cflag;
 515         old_cflag = old_termios->c_cflag;
 516         baud = tty_get_baud_rate(port->tty);
 517
 518         /* If the baud rate is to be updated*/
 519         if (baud != tty_termios_baud_rate(old_termios)) {
 520                 switch (baud) {
 521                         case 0:
 522                         case 600:
 523                         case 1200:
 524                         case 1800:
 525                         case 2400:
 526                         case 4800:
 527                         case 7200:
 528                         case 9600:
 529                         case 14400:
 530                         case 19200:
 531                         case 28800:
 532                         case 38400:
 533                         case 55854:
 534                         case 57600:
 535                         case 115200:
 536                         case 127117:
 537                         case 230400:
 538                         case 460800:
 539                         case 921600:
 540                         case 3686400:
 541                                 break;
 542                         default:
 543                                 baud = 9600;
 544                                 break;
 545                 }
 546
 547                 if (baud) {
 548                         dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
 549                                         baud);
 550                         if (cp2101_set_config_single(port, CP2101_BAUDRATE,
 551                                                 (BAUD_RATE_GEN_FREQ / baud))) {
 552                                 dev_err(&port->dev, "Baud rate requested not "
 553                                                 "supported by device\n");
 554                                 baud = tty_termios_baud_rate(old_termios);
 555                         }
 556                 }
 557         }
 558         /* Report back the resulting baud rate */
 559         tty_encode_baud_rate(port->tty, baud, baud);
 560
 561         /* If the number of data bits is to be updated */
 562         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 563                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 564                 bits &= ~BITS_DATA_MASK;
 565                 switch (cflag & CSIZE) {
 566                         case CS5:
 567                                 bits |= BITS_DATA_5;
 568                                 dbg("%s - data bits = 5", __FUNCTION__);
 569                                 break;
 570                         case CS6:
 571                                 bits |= BITS_DATA_6;
 572                                 dbg("%s - data bits = 6", __FUNCTION__);
 573                                 break;
 574                         case CS7:
 575                                 bits |= BITS_DATA_7;
 576                                 dbg("%s - data bits = 7", __FUNCTION__);
 577                                 break;
 578                         case CS8:
 579                                 bits |= BITS_DATA_8;
 580                                 dbg("%s - data bits = 8", __FUNCTION__);
 581                                 break;
 582                         /*case CS9:
 583                                 bits |= BITS_DATA_9;
 584                                 dbg("%s - data bits = 9", __FUNCTION__);
 585                                 break;*/
 586                         default:
 587                                 dev_err(&port->dev, "cp2101 driver does not "
 588                                         "support the number of bits requested,"
 589                                         " using 8 bit mode\n");
 590                                 bits |= BITS_DATA_8;
 591                                 break;
 592                 }
 593                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 594                         dev_err(&port->dev, "Number of data bits requested "
 595                                         "not supported by device\n");
 596         }
 597
 598         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
 599                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 600                 bits &= ~BITS_PARITY_MASK;
 601                 if (cflag & PARENB) {
 602                         if (cflag & PARODD) {
 603                                 bits |= BITS_PARITY_ODD;
 604                                 dbg("%s - parity = ODD", __FUNCTION__);
 605                         } else {
 606                                 bits |= BITS_PARITY_EVEN;
 607                                 dbg("%s - parity = EVEN", __FUNCTION__);
 608                         }
 609                 }
 610                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 611                         dev_err(&port->dev, "Parity mode not supported "
 612                                         "by device\n");
 613         }
 614
 615         if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 616                 cp2101_get_config(port, CP2101_BITS, &bits, 2);
 617                 bits &= ~BITS_STOP_MASK;
 618                 if (cflag & CSTOPB) {
 619                         bits |= BITS_STOP_2;
 620                         dbg("%s - stop bits = 2", __FUNCTION__);
 621                 } else {
 622                         bits |= BITS_STOP_1;
 623                         dbg("%s - stop bits = 1", __FUNCTION__);
 624                 }
 625                 if (cp2101_set_config(port, CP2101_BITS, &bits, 2))
 626                         dev_err(&port->dev, "Number of stop bits requested "
 627                                         "not supported by device\n");
 628         }
 629
 630         if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 631                 cp2101_get_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 632                 dbg("%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 633                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 634                                 modem_ctl[2], modem_ctl[3]);
 635
 636                 if (cflag & CRTSCTS) {
 637                         modem_ctl[0] &= ~0x7B;
 638                         modem_ctl[0] |= 0x09;
 639                         modem_ctl[1] = 0x80;
 640                         dbg("%s - flow control = CRTSCTS", __FUNCTION__);
 641                 } else {
 642                         modem_ctl[0] &= ~0x7B;
 643                         modem_ctl[0] |= 0x01;
 644                         modem_ctl[1] |= 0x40;
 645                         dbg("%s - flow control = NONE", __FUNCTION__);
 646                 }
 647
 648                 dbg("%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x",
 649                                 __FUNCTION__, modem_ctl[0], modem_ctl[1],
 650                                 modem_ctl[2], modem_ctl[3]);
 651                 cp2101_set_config(port, CP2101_MODEMCTL, modem_ctl, 16);
 652         }
 653
 654 }
 655
 656 static int cp2101_tiocmset (struct usb_serial_port *port, struct file *file,
 657                 unsigned int set, unsigned int clear)
 658 {
 659         int control = 0;
 660
 661         dbg("%s - port %d", __FUNCTION__, port->number);
 662
 663         if (set & TIOCM_RTS) {
 664                 control |= CONTROL_RTS;
 665                 control |= CONTROL_WRITE_RTS;
 666         }
 667         if (set & TIOCM_DTR) {
 668                 control |= CONTROL_DTR;
 669                 control |= CONTROL_WRITE_DTR;
 670         }
 671         if (clear & TIOCM_RTS) {
 672                 control &= ~CONTROL_RTS;
 673                 control |= CONTROL_WRITE_RTS;
 674         }
 675         if (clear & TIOCM_DTR) {
 676                 control &= ~CONTROL_DTR;
 677                 control |= CONTROL_WRITE_DTR;
 678         }
 679
 680         dbg("%s - control = 0x%.4x", __FUNCTION__, control);
 681
 682         return cp2101_set_config(port, CP2101_CONTROL, &control, 2);
 683
 684 }
 685
 686 static int cp2101_tiocmget (struct usb_serial_port *port, struct file *file)
 687 {
 688         int control, result;
 689
 690         dbg("%s - port %d", __FUNCTION__, port->number);
 691
 692         cp2101_get_config(port, CP2101_CONTROL, &control, 1);
 693
 694         result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
 695                 |((control & CONTROL_RTS) ? TIOCM_RTS : 0)
 696                 |((control & CONTROL_CTS) ? TIOCM_CTS : 0)
 697                 |((control & CONTROL_DSR) ? TIOCM_DSR : 0)
 698                 |((control & CONTROL_RING)? TIOCM_RI  : 0)
 699                 |((control & CONTROL_DCD) ? TIOCM_CD  : 0);
 700
 701         dbg("%s - control = 0x%.2x", __FUNCTION__, control);
 702
 703         return result;
 704 }
 705
 706 static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
 707 {
 708         int state;
 709
 710         dbg("%s - port %d", __FUNCTION__, port->number);
 711         if (break_state == 0)
 712                 state = BREAK_OFF;
 713         else
 714                 state = BREAK_ON;
 715         dbg("%s - turning break %s", __FUNCTION__,
 716                         state==BREAK_OFF ? "off" : "on");
 717         cp2101_set_config(port, CP2101_BREAK, &state, 2);
 718 }
 719
 720 static int cp2101_startup (struct usb_serial *serial)
 721 {
 722         /* CP2101 buffers behave strangely unless device is reset */
 723         usb_reset_device(serial->dev);
 724         return 0;
 725 }
 726
 727 static void cp2101_shutdown (struct usb_serial *serial)
 728 {
 729         int i;
 730
 731         dbg("%s", __FUNCTION__);
 732
 733         /* Stop reads and writes on all ports */
 734         for (i=0; i < serial->num_ports; ++i) {
 735                 cp2101_cleanup(serial->port[i]);
 736         }
 737 }
 738
 739 static int __init cp2101_init (void)
 740 {
 741         int retval;
 742
 743         retval = usb_serial_register(&cp2101_device);
 744         if (retval)
 745                 return retval; /* Failed to register */
 746
 747         retval = usb_register(&cp2101_driver);
 748         if (retval) {
 749                 /* Failed to register */
 750                 usb_serial_deregister(&cp2101_device);
 751                 return retval;
 752         }
 753
 754         /* Success */
 755         info(DRIVER_DESC " " DRIVER_VERSION);
 756         return 0;
 757 }
 758
 759 static void __exit cp2101_exit (void)
 760 {
 761         usb_deregister (&cp2101_driver);
 762         usb_serial_deregister (&cp2101_device);
 763 }
 764
 765 module_init(cp2101_init);
 766 module_exit(cp2101_exit);
 767
 768 MODULE_DESCRIPTION(DRIVER_DESC);
 769 MODULE_VERSION(DRIVER_VERSION);
 770 MODULE_LICENSE("GPL");
 771
 772 module_param(debug, bool, S_IRUGO | S_IWUSR);
 773 MODULE_PARM_DESC(debug, "Enable verbose debugging messages");