drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
   5  * Copyright (C) 2003 IBM Corp.
   6  *
   7  * Original driver for 2.2.x by anonymous
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License version
  11  *      2 as published by the Free Software Foundation.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this
  14  * driver
  15  *
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/tty.h>
  23 #include <linux/tty_driver.h>
  24 #include <linux/tty_flip.h>
  25 #include <linux/serial.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/usb.h>
  31 #include <linux/usb/serial.h>
  32 #include "pl2303.h"
  33
  34 /*
  35  * Version Information
  36  */
  37 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  38
  39 static int debug;
  40
  41 #define PL2303_CLOSING_WAIT     (30*HZ)
  42
  43 static const struct usb_device_id id_table[] = {
  44         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  45         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  48         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  49         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  50         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  51         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  52         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  53         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
  55         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  56         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  57         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  58         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  59         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  60         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  61         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  62         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  63         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  64         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  65         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  66         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  67         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  68         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  69         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  70         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  71         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  72         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
  74         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  75         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  76         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  77         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  78         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  79         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  80         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  81         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  82         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  83         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
  84         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  85         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  86         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  87         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
  88         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
  89         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
  90         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
  91         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
  92         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
  93         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
  94         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
  95         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
  96         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
  97         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
  98         { }                                     /* Terminating entry */
  99 };
 100
 101 MODULE_DEVICE_TABLE(usb, id_table);
 102
 103 static struct usb_driver pl2303_driver = {
 104         .name =         "pl2303",
 105         .probe =        usb_serial_probe,
 106         .disconnect =   usb_serial_disconnect,
 107         .id_table =     id_table,
 108         .suspend =      usb_serial_suspend,
 109         .resume =       usb_serial_resume,
 110         .no_dynamic_id =        1,
 111         .supports_autosuspend = 1,
 112 };
 113
 114 #define SET_LINE_REQUEST_TYPE           0x21
 115 #define SET_LINE_REQUEST                0x20
 116
 117 #define SET_CONTROL_REQUEST_TYPE        0x21
 118 #define SET_CONTROL_REQUEST             0x22
 119 #define CONTROL_DTR                     0x01
 120 #define CONTROL_RTS                     0x02
 121
 122 #define BREAK_REQUEST_TYPE              0x21
 123 #define BREAK_REQUEST                   0x23
 124 #define BREAK_ON                        0xffff
 125 #define BREAK_OFF                       0x0000
 126
 127 #define GET_LINE_REQUEST_TYPE           0xa1
 128 #define GET_LINE_REQUEST                0x21
 129
 130 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 131 #define VENDOR_WRITE_REQUEST            0x01
 132
 133 #define VENDOR_READ_REQUEST_TYPE        0xc0
 134 #define VENDOR_READ_REQUEST             0x01
 135
 136 #define UART_STATE                      0x08
 137 #define UART_STATE_TRANSIENT_MASK       0x74
 138 #define UART_DCD                        0x01
 139 #define UART_DSR                        0x02
 140 #define UART_BREAK_ERROR                0x04
 141 #define UART_RING                       0x08
 142 #define UART_FRAME_ERROR                0x10
 143 #define UART_PARITY_ERROR               0x20
 144 #define UART_OVERRUN_ERROR              0x40
 145 #define UART_CTS                        0x80
 146
 147
 148 enum pl2303_type {
 149         type_0,         /* don't know the difference between type 0 and */
 150         type_1,         /* type 1, until someone from prolific tells us... */
 151         HX,             /* HX version of the pl2303 chip */
 152 };
 153
 154 struct pl2303_private {
 155         spinlock_t lock;
 156         u8 line_control;
 157         u8 line_status;
 158         enum pl2303_type type;
 159
 160         u8 line_settings[7];
 161 };
 162
 163 static int pl2303_vendor_read(__u16 value, __u16 index,
 164                 struct usb_serial *serial, unsigned char *buf)
 165 {
 166         int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 167                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 168                         value, index, buf, 1, 100);
 169         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x", VENDOR_READ_REQUEST_TYPE,
 170                         VENDOR_READ_REQUEST, value, index, res, buf[0]);
 171         return res;
 172 }
 173
 174 static int pl2303_vendor_write(__u16 value, __u16 index,
 175                 struct usb_serial *serial)
 176 {
 177         int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 178                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 179                         value, index, NULL, 0, 100);
 180         dbg("0x%x:0x%x:0x%x:0x%x  %d", VENDOR_WRITE_REQUEST_TYPE,
 181                         VENDOR_WRITE_REQUEST, value, index, res);
 182         return res;
 183 }
 184
 185 static int pl2303_startup(struct usb_serial *serial)
 186 {
 187         struct pl2303_private *priv;
 188         enum pl2303_type type = type_0;
 189         unsigned char *buf;
 190         int i;
 191
 192         buf = kmalloc(10, GFP_KERNEL);
 193         if (buf == NULL)
 194                 return -ENOMEM;
 195
 196         if (serial->dev->descriptor.bDeviceClass == 0x02)
 197                 type = type_0;
 198         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 199                 type = HX;
 200         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 201                 type = type_1;
 202         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 203                 type = type_1;
 204         dbg("device type: %d", type);
 205
 206         for (i = 0; i < serial->num_ports; ++i) {
 207                 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
 208                 if (!priv)
 209                         goto cleanup;
 210                 spin_lock_init(&priv->lock);
 211                 priv->type = type;
 212                 usb_set_serial_port_data(serial->port[i], priv);
 213         }
 214
 215         pl2303_vendor_read(0x8484, 0, serial, buf);
 216         pl2303_vendor_write(0x0404, 0, serial);
 217         pl2303_vendor_read(0x8484, 0, serial, buf);
 218         pl2303_vendor_read(0x8383, 0, serial, buf);
 219         pl2303_vendor_read(0x8484, 0, serial, buf);
 220         pl2303_vendor_write(0x0404, 1, serial);
 221         pl2303_vendor_read(0x8484, 0, serial, buf);
 222         pl2303_vendor_read(0x8383, 0, serial, buf);
 223         pl2303_vendor_write(0, 1, serial);
 224         pl2303_vendor_write(1, 0, serial);
 225         if (type == HX)
 226                 pl2303_vendor_write(2, 0x44, serial);
 227         else
 228                 pl2303_vendor_write(2, 0x24, serial);
 229
 230         kfree(buf);
 231         return 0;
 232
 233 cleanup:
 234         kfree(buf);
 235         for (--i; i >= 0; --i) {
 236                 priv = usb_get_serial_port_data(serial->port[i]);
 237                 kfree(priv);
 238                 usb_set_serial_port_data(serial->port[i], NULL);
 239         }
 240         return -ENOMEM;
 241 }
 242
 243 static int set_control_lines(struct usb_device *dev, u8 value)
 244 {
 245         int retval;
 246
 247         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 248                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 249                                  value, 0, NULL, 0, 100);
 250         dbg("%s - value = %d, retval = %d", __func__, value, retval);
 251         return retval;
 252 }
 253
 254 static void pl2303_set_termios(struct tty_struct *tty,
 255                 struct usb_serial_port *port, struct ktermios *old_termios)
 256 {
 257         struct usb_serial *serial = port->serial;
 258         struct pl2303_private *priv = usb_get_serial_port_data(port);
 259         unsigned long flags;
 260         unsigned int cflag;
 261         unsigned char *buf;
 262         int baud;
 263         int i;
 264         u8 control;
 265         const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
 266                                  4800, 7200, 9600, 14400, 19200, 28800, 38400,
 267                                  57600, 115200, 230400, 460800, 614400,
 268                                  921600, 1228800, 2457600, 3000000, 6000000 };
 269         int baud_floor, baud_ceil;
 270         int k;
 271
 272         dbg("%s -  port %d", __func__, port->number);
 273
 274         if (old_termios && !tty_termios_hw_change(tty->termios, old_termios))
 275                 return;
 276
 277         cflag = tty->termios->c_cflag;
 278
 279         buf = kzalloc(7, GFP_KERNEL);
 280         if (!buf) {
 281                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 282                 /* Report back no change occurred */
 283                 if (old_termios)
 284                         *tty->termios = *old_termios;
 285                 return;
 286         }
 287
 288         i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 289                             GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 290                             0, 0, buf, 7, 100);
 291         dbg("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 292             buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 293
 294         switch (C_CSIZE(tty)) {
 295         case CS5:
 296                 buf[6] = 5;
 297                 break;
 298         case CS6:
 299                 buf[6] = 6;
 300                 break;
 301         case CS7:
 302                 buf[6] = 7;
 303                 break;
 304         default:
 305         case CS8:
 306                 buf[6] = 8;
 307         }
 308         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 309
 310         /* For reference buf[0]:buf[3] baud rate value */
 311         /* NOTE: Only the values defined in baud_sup are supported !
 312          *       => if unsupported values are set, the PL2303 seems to use
 313          *          9600 baud (at least my PL2303X always does)
 314          */
 315         baud = tty_get_baud_rate(tty);
 316         dbg("%s - baud requested = %d", __func__, baud);
 317         if (baud) {
 318                 /* Set baudrate to nearest supported value */
 319                 for (k=0; k<ARRAY_SIZE(baud_sup); k++) {
 320                         if (baud_sup[k] / baud) {
 321                                 baud_ceil = baud_sup[k];
 322                                 if (k==0) {
 323                                         baud = baud_ceil;
 324                                 } else {
 325                                         baud_floor = baud_sup[k-1];
 326                                         if ((baud_ceil % baud)
 327                                             > (baud % baud_floor))
 328                                                 baud = baud_floor;
 329                                         else
 330                                                 baud = baud_ceil;
 331                                 }
 332                                 break;
 333                         }
 334                 }
 335                 if (baud > 1228800) {
 336                         /* type_0, type_1 only support up to 1228800 baud */
 337                         if (priv->type != HX)
 338                                 baud = 1228800;
 339                         else if (baud > 6000000)
 340                                 baud = 6000000;
 341                 }
 342                 dbg("%s - baud set = %d", __func__, baud);
 343                 if (baud <= 115200) {
 344                         buf[0] = baud & 0xff;
 345                         buf[1] = (baud >> 8) & 0xff;
 346                         buf[2] = (baud >> 16) & 0xff;
 347                         buf[3] = (baud >> 24) & 0xff;
 348                 } else {
 349                         /* apparently the formula for higher speeds is:
 350                          * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
 351                          */
 352                         unsigned tmp = 12*1000*1000*32 / baud;
 353                         buf[3] = 0x80;
 354                         buf[2] = 0;
 355                         buf[1] = (tmp >= 256);
 356                         while (tmp >= 256) {
 357                                 tmp >>= 2;
 358                                 buf[1] <<= 1;
 359                         }
 360                         buf[0] = tmp;
 361                 }
 362         }
 363
 364         /* For reference buf[4]=0 is 1 stop bits */
 365         /* For reference buf[4]=1 is 1.5 stop bits */
 366         /* For reference buf[4]=2 is 2 stop bits */
 367         if (cflag & CSTOPB) {
 368                 /* NOTE: Comply with "real" UARTs / RS232:
 369                  *       use 1.5 instead of 2 stop bits with 5 data bits
 370                  */
 371                 if ((cflag & CSIZE) == CS5) {
 372                         buf[4] = 1;
 373                         dbg("%s - stop bits = 1.5", __func__);
 374                 } else {
 375                         buf[4] = 2;
 376                         dbg("%s - stop bits = 2", __func__);
 377                 }
 378         } else {
 379                 buf[4] = 0;
 380                 dbg("%s - stop bits = 1", __func__);
 381         }
 382
 383         if (cflag & PARENB) {
 384                 /* For reference buf[5]=0 is none parity */
 385                 /* For reference buf[5]=1 is odd parity */
 386                 /* For reference buf[5]=2 is even parity */
 387                 /* For reference buf[5]=3 is mark parity */
 388                 /* For reference buf[5]=4 is space parity */
 389                 if (cflag & PARODD) {
 390                         if (cflag & CMSPAR) {
 391                                 buf[5] = 3;
 392                                 dbg("%s - parity = mark", __func__);
 393                         } else {
 394                                 buf[5] = 1;
 395                                 dbg("%s - parity = odd", __func__);
 396                         }
 397                 } else {
 398                         if (cflag & CMSPAR) {
 399                                 buf[5] = 4;
 400                                 dbg("%s - parity = space", __func__);
 401                         } else {
 402                                 buf[5] = 2;
 403                                 dbg("%s - parity = even", __func__);
 404                         }
 405                 }
 406         } else {
 407                 buf[5] = 0;
 408                 dbg("%s - parity = none", __func__);
 409         }
 410
 411         /*
 412          * Some PL2303 are known to lose bytes if you change serial settings
 413          * even to the same values as before. Thus we actually need to filter
 414          * in this specific case.
 415          *
 416          * Note that the tty_termios_hw_change check above is not sufficient
 417          * as a previously requested baud rate may differ from the one
 418          * actually used (and stored in old_termios).
 419          *
 420          * NOTE: No additional locking needed for line_settings as it is
 421          *       only used in set_termios, which is serialised against itself.
 422          */
 423         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 424                 i = usb_control_msg(serial->dev,
 425                                     usb_sndctrlpipe(serial->dev, 0),
 426                                     SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 427                                     0, 0, buf, 7, 100);
 428
 429                 dbg("0x21:0x20:0:0  %d", i);
 430
 431                 if (i == 7)
 432                         memcpy(priv->line_settings, buf, 7);
 433         }
 434
 435         /* change control lines if we are switching to or from B0 */
 436         spin_lock_irqsave(&priv->lock, flags);
 437         control = priv->line_control;
 438         if ((cflag & CBAUD) == B0)
 439                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 440         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 441                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 442         if (control != priv->line_control) {
 443                 control = priv->line_control;
 444                 spin_unlock_irqrestore(&priv->lock, flags);
 445                 set_control_lines(serial->dev, control);
 446         } else {
 447                 spin_unlock_irqrestore(&priv->lock, flags);
 448         }
 449
 450         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 451
 452         i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 453                             GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 454                             0, 0, buf, 7, 100);
 455         dbg("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 456              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 457
 458         if (cflag & CRTSCTS) {
 459                 if (priv->type == HX)
 460                         pl2303_vendor_write(0x0, 0x61, serial);
 461                 else
 462                         pl2303_vendor_write(0x0, 0x41, serial);
 463         } else {
 464                 pl2303_vendor_write(0x0, 0x0, serial);
 465         }
 466
 467         /* Save resulting baud rate */
 468         if (baud)
 469                 tty_encode_baud_rate(tty, baud, baud);
 470
 471         kfree(buf);
 472 }
 473
 474 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 475 {
 476         struct pl2303_private *priv = usb_get_serial_port_data(port);
 477         unsigned long flags;
 478         u8 control;
 479
 480         spin_lock_irqsave(&priv->lock, flags);
 481         /* Change DTR and RTS */
 482         if (on)
 483                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 484         else
 485                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 486         control = priv->line_control;
 487         spin_unlock_irqrestore(&priv->lock, flags);
 488         set_control_lines(port->serial->dev, control);
 489 }
 490
 491 static void pl2303_close(struct usb_serial_port *port)
 492 {
 493         dbg("%s - port %d", __func__, port->number);
 494
 495         usb_serial_generic_close(port);
 496         usb_kill_urb(port->interrupt_in_urb);
 497 }
 498
 499 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 500 {
 501         struct usb_serial *serial = port->serial;
 502         struct pl2303_private *priv = usb_get_serial_port_data(port);
 503         int result;
 504
 505         dbg("%s -  port %d", __func__, port->number);
 506
 507         if (priv->type != HX) {
 508                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 509                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 510         } else {
 511                 /* reset upstream data pipes */
 512                 pl2303_vendor_write(8, 0, serial);
 513                 pl2303_vendor_write(9, 0, serial);
 514         }
 515
 516         /* Setup termios */
 517         if (tty)
 518                 pl2303_set_termios(tty, port, NULL);
 519
 520         dbg("%s - submitting read urb", __func__);
 521         result = usb_serial_generic_submit_read_urb(port, GFP_KERNEL);
 522         if (result) {
 523                 pl2303_close(port);
 524                 return -EPROTO;
 525         }
 526
 527         dbg("%s - submitting interrupt urb", __func__);
 528         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 529         if (result) {
 530                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 531                         " error %d\n", __func__, result);
 532                 pl2303_close(port);
 533                 return -EPROTO;
 534         }
 535         port->port.drain_delay = 256;
 536         return 0;
 537 }
 538
 539 static int pl2303_tiocmset(struct tty_struct *tty,
 540                            unsigned int set, unsigned int clear)
 541 {
 542         struct usb_serial_port *port = tty->driver_data;
 543         struct pl2303_private *priv = usb_get_serial_port_data(port);
 544         unsigned long flags;
 545         u8 control;
 546
 547         if (!usb_get_intfdata(port->serial->interface))
 548                 return -ENODEV;
 549
 550         spin_lock_irqsave(&priv->lock, flags);
 551         if (set & TIOCM_RTS)
 552                 priv->line_control |= CONTROL_RTS;
 553         if (set & TIOCM_DTR)
 554                 priv->line_control |= CONTROL_DTR;
 555         if (clear & TIOCM_RTS)
 556                 priv->line_control &= ~CONTROL_RTS;
 557         if (clear & TIOCM_DTR)
 558                 priv->line_control &= ~CONTROL_DTR;
 559         control = priv->line_control;
 560         spin_unlock_irqrestore(&priv->lock, flags);
 561
 562         return set_control_lines(port->serial->dev, control);
 563 }
 564
 565 static int pl2303_tiocmget(struct tty_struct *tty)
 566 {
 567         struct usb_serial_port *port = tty->driver_data;
 568         struct pl2303_private *priv = usb_get_serial_port_data(port);
 569         unsigned long flags;
 570         unsigned int mcr;
 571         unsigned int status;
 572         unsigned int result;
 573
 574         dbg("%s (%d)", __func__, port->number);
 575
 576         if (!usb_get_intfdata(port->serial->interface))
 577                 return -ENODEV;
 578
 579         spin_lock_irqsave(&priv->lock, flags);
 580         mcr = priv->line_control;
 581         status = priv->line_status;
 582         spin_unlock_irqrestore(&priv->lock, flags);
 583
 584         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 585                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 586                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 587                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 588                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 589                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 590
 591         dbg("%s - result = %x", __func__, result);
 592
 593         return result;
 594 }
 595
 596 static int pl2303_carrier_raised(struct usb_serial_port *port)
 597 {
 598         struct pl2303_private *priv = usb_get_serial_port_data(port);
 599         if (priv->line_status & UART_DCD)
 600                 return 1;
 601         return 0;
 602 }
 603
 604 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 605 {
 606         struct pl2303_private *priv = usb_get_serial_port_data(port);
 607         unsigned long flags;
 608         unsigned int prevstatus;
 609         unsigned int status;
 610         unsigned int changed;
 611
 612         spin_lock_irqsave(&priv->lock, flags);
 613         prevstatus = priv->line_status;
 614         spin_unlock_irqrestore(&priv->lock, flags);
 615
 616         while (1) {
 617                 interruptible_sleep_on(&port->delta_msr_wait);
 618                 /* see if a signal did it */
 619                 if (signal_pending(current))
 620                         return -ERESTARTSYS;
 621
 622                 if (port->serial->disconnected)
 623                         return -EIO;
 624
 625                 spin_lock_irqsave(&priv->lock, flags);
 626                 status = priv->line_status;
 627                 spin_unlock_irqrestore(&priv->lock, flags);
 628
 629                 changed = prevstatus ^ status;
 630
 631                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 632                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 633                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 634                     ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
 635                         return 0;
 636                 }
 637                 prevstatus = status;
 638         }
 639         /* NOTREACHED */
 640         return 0;
 641 }
 642
 643 static int pl2303_ioctl(struct tty_struct *tty,
 644                         unsigned int cmd, unsigned long arg)
 645 {
 646         struct serial_struct ser;
 647         struct usb_serial_port *port = tty->driver_data;
 648         dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
 649
 650         switch (cmd) {
 651         case TIOCGSERIAL:
 652                 memset(&ser, 0, sizeof ser);
 653                 ser.type = PORT_16654;
 654                 ser.line = port->serial->minor;
 655                 ser.port = port->number;
 656                 ser.baud_base = 460800;
 657
 658                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
 659                         return -EFAULT;
 660
 661                 return 0;
 662
 663         case TIOCMIWAIT:
 664                 dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
 665                 return wait_modem_info(port, arg);
 666         default:
 667                 dbg("%s not supported = 0x%04x", __func__, cmd);
 668                 break;
 669         }
 670         return -ENOIOCTLCMD;
 671 }
 672
 673 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
 674 {
 675         struct usb_serial_port *port = tty->driver_data;
 676         struct usb_serial *serial = port->serial;
 677         u16 state;
 678         int result;
 679
 680         dbg("%s - port %d", __func__, port->number);
 681
 682         if (break_state == 0)
 683                 state = BREAK_OFF;
 684         else
 685                 state = BREAK_ON;
 686         dbg("%s - turning break %s", __func__,
 687                         state == BREAK_OFF ? "off" : "on");
 688
 689         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 690                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 691                                  0, NULL, 0, 100);
 692         if (result)
 693                 dbg("%s - error sending break = %d", __func__, result);
 694 }
 695
 696 static void pl2303_release(struct usb_serial *serial)
 697 {
 698         int i;
 699         struct pl2303_private *priv;
 700
 701         dbg("%s", __func__);
 702
 703         for (i = 0; i < serial->num_ports; ++i) {
 704                 priv = usb_get_serial_port_data(serial->port[i]);
 705                 kfree(priv);
 706         }
 707 }
 708
 709 static void pl2303_update_line_status(struct usb_serial_port *port,
 710                                       unsigned char *data,
 711                                       unsigned int actual_length)
 712 {
 713
 714         struct pl2303_private *priv = usb_get_serial_port_data(port);
 715         struct tty_struct *tty;
 716         unsigned long flags;
 717         u8 status_idx = UART_STATE;
 718         u8 length = UART_STATE + 1;
 719         u8 prev_line_status;
 720         u16 idv, idp;
 721
 722         idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
 723         idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
 724
 725
 726         if (idv == SIEMENS_VENDOR_ID) {
 727                 if (idp == SIEMENS_PRODUCT_ID_X65 ||
 728                     idp == SIEMENS_PRODUCT_ID_SX1 ||
 729                     idp == SIEMENS_PRODUCT_ID_X75) {
 730
 731                         length = 1;
 732                         status_idx = 0;
 733                 }
 734         }
 735
 736         if (actual_length < length)
 737                 return;
 738
 739         /* Save off the uart status for others to look at */
 740         spin_lock_irqsave(&priv->lock, flags);
 741         prev_line_status = priv->line_status;
 742         priv->line_status = data[status_idx];
 743         spin_unlock_irqrestore(&priv->lock, flags);
 744         if (priv->line_status & UART_BREAK_ERROR)
 745                 usb_serial_handle_break(port);
 746         wake_up_interruptible(&port->delta_msr_wait);
 747
 748         tty = tty_port_tty_get(&port->port);
 749         if (!tty)
 750                 return;
 751         if ((priv->line_status ^ prev_line_status) & UART_DCD)
 752                 usb_serial_handle_dcd_change(port, tty,
 753                                 priv->line_status & UART_DCD);
 754         tty_kref_put(tty);
 755 }
 756
 757 static void pl2303_read_int_callback(struct urb *urb)
 758 {
 759         struct usb_serial_port *port =  urb->context;
 760         unsigned char *data = urb->transfer_buffer;
 761         unsigned int actual_length = urb->actual_length;
 762         int status = urb->status;
 763         int retval;
 764
 765         dbg("%s (%d)", __func__, port->number);
 766
 767         switch (status) {
 768         case 0:
 769                 /* success */
 770                 break;
 771         case -ECONNRESET:
 772         case -ENOENT:
 773         case -ESHUTDOWN:
 774                 /* this urb is terminated, clean up */
 775                 dbg("%s - urb shutting down with status: %d", __func__,
 776                     status);
 777                 return;
 778         default:
 779                 dbg("%s - nonzero urb status received: %d", __func__,
 780                     status);
 781                 goto exit;
 782         }
 783
 784         usb_serial_debug_data(debug, &port->dev, __func__,
 785                               urb->actual_length, urb->transfer_buffer);
 786
 787         pl2303_update_line_status(port, data, actual_length);
 788
 789 exit:
 790         retval = usb_submit_urb(urb, GFP_ATOMIC);
 791         if (retval)
 792                 dev_err(&urb->dev->dev,
 793                         "%s - usb_submit_urb failed with result %d\n",
 794                         __func__, retval);
 795 }
 796
 797 static void pl2303_process_read_urb(struct urb *urb)
 798 {
 799         struct usb_serial_port *port = urb->context;
 800         struct pl2303_private *priv = usb_get_serial_port_data(port);
 801         struct tty_struct *tty;
 802         unsigned char *data = urb->transfer_buffer;
 803         char tty_flag = TTY_NORMAL;
 804         unsigned long flags;
 805         u8 line_status;
 806         int i;
 807
 808         /* update line status */
 809         spin_lock_irqsave(&priv->lock, flags);
 810         line_status = priv->line_status;
 811         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 812         spin_unlock_irqrestore(&priv->lock, flags);
 813         wake_up_interruptible(&port->delta_msr_wait);
 814
 815         if (!urb->actual_length)
 816                 return;
 817
 818         tty = tty_port_tty_get(&port->port);
 819         if (!tty)
 820                 return;
 821
 822         /* break takes precedence over parity, */
 823         /* which takes precedence over framing errors */
 824         if (line_status & UART_BREAK_ERROR)
 825                 tty_flag = TTY_BREAK;
 826         else if (line_status & UART_PARITY_ERROR)
 827                 tty_flag = TTY_PARITY;
 828         else if (line_status & UART_FRAME_ERROR)
 829                 tty_flag = TTY_FRAME;
 830         dbg("%s - tty_flag = %d", __func__, tty_flag);
 831
 832         /* overrun is special, not associated with a char */
 833         if (line_status & UART_OVERRUN_ERROR)
 834                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 835
 836         if (port->port.console && port->sysrq) {
 837                 for (i = 0; i < urb->actual_length; ++i)
 838                         if (!usb_serial_handle_sysrq_char(port, data[i]))
 839                                 tty_insert_flip_char(tty, data[i], tty_flag);
 840         } else {
 841                 tty_insert_flip_string_fixed_flag(tty, data, tty_flag,
 842                                                         urb->actual_length);
 843         }
 844
 845         tty_flip_buffer_push(tty);
 846         tty_kref_put(tty);
 847 }
 848
 849 /* All of the device info needed for the PL2303 SIO serial converter */
 850 static struct usb_serial_driver pl2303_device = {
 851         .driver = {
 852                 .owner =        THIS_MODULE,
 853                 .name =         "pl2303",
 854         },
 855         .id_table =             id_table,
 856         .usb_driver =           &pl2303_driver,
 857         .num_ports =            1,
 858         .bulk_in_size =         256,
 859         .bulk_out_size =        256,
 860         .open =                 pl2303_open,
 861         .close =                pl2303_close,
 862         .dtr_rts =              pl2303_dtr_rts,
 863         .carrier_raised =       pl2303_carrier_raised,
 864         .ioctl =                pl2303_ioctl,
 865         .break_ctl =            pl2303_break_ctl,
 866         .set_termios =          pl2303_set_termios,
 867         .tiocmget =             pl2303_tiocmget,
 868         .tiocmset =             pl2303_tiocmset,
 869         .process_read_urb =     pl2303_process_read_urb,
 870         .read_int_callback =    pl2303_read_int_callback,
 871         .attach =               pl2303_startup,
 872         .release =              pl2303_release,
 873 };
 874
 875 static int __init pl2303_init(void)
 876 {
 877         int retval;
 878
 879         retval = usb_serial_register(&pl2303_device);
 880         if (retval)
 881                 goto failed_usb_serial_register;
 882         retval = usb_register(&pl2303_driver);
 883         if (retval)
 884                 goto failed_usb_register;
 885         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
 886         return 0;
 887 failed_usb_register:
 888         usb_serial_deregister(&pl2303_device);
 889 failed_usb_serial_register:
 890         return retval;
 891 }
 892
 893 static void __exit pl2303_exit(void)
 894 {
 895         usb_deregister(&pl2303_driver);
 896         usb_serial_deregister(&pl2303_device);
 897 }
 898
 899 module_init(pl2303_init);
 900 module_exit(pl2303_exit);
 901
 902 MODULE_DESCRIPTION(DRIVER_DESC);
 903 MODULE_LICENSE("GPL");
 904
 905 module_param(debug, bool, S_IRUGO | S_IWUSR);
 906 MODULE_PARM_DESC(debug, "Debug enabled or not");
 907