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 <asm/unaligned.h>
  33 #include "pl2303.h"
  34
  35 /*
  36  * Version Information
  37  */
  38 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  39
  40 static const struct usb_device_id id_table[] = {
  41         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  42         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  43         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  44         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  45         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  48         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  49         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  50         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  51         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  52         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  53         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  54         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  55         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  56         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  57         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  58         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  59         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  60         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  61         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  62         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  63         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  64         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  65         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  66         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  67         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
  68         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
  69         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
  70         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
  71         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  72         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  73         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  74         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  75         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  76         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  77         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  78         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  79         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  80         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
  81         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  82         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  83         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  84         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
  85         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
  86         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
  87         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
  88         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
  89         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
  90         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
  91         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
  92         { }                                     /* Terminating entry */
  93 };
  94
  95 MODULE_DEVICE_TABLE(usb, id_table);
  96
  97 #define SET_LINE_REQUEST_TYPE           0x21
  98 #define SET_LINE_REQUEST                0x20
  99
 100 #define SET_CONTROL_REQUEST_TYPE        0x21
 101 #define SET_CONTROL_REQUEST             0x22
 102 #define CONTROL_DTR                     0x01
 103 #define CONTROL_RTS                     0x02
 104
 105 #define BREAK_REQUEST_TYPE              0x21
 106 #define BREAK_REQUEST                   0x23
 107 #define BREAK_ON                        0xffff
 108 #define BREAK_OFF                       0x0000
 109
 110 #define GET_LINE_REQUEST_TYPE           0xa1
 111 #define GET_LINE_REQUEST                0x21
 112
 113 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 114 #define VENDOR_WRITE_REQUEST            0x01
 115
 116 #define VENDOR_READ_REQUEST_TYPE        0xc0
 117 #define VENDOR_READ_REQUEST             0x01
 118
 119 #define UART_STATE                      0x08
 120 #define UART_STATE_TRANSIENT_MASK       0x74
 121 #define UART_DCD                        0x01
 122 #define UART_DSR                        0x02
 123 #define UART_BREAK_ERROR                0x04
 124 #define UART_RING                       0x08
 125 #define UART_FRAME_ERROR                0x10
 126 #define UART_PARITY_ERROR               0x20
 127 #define UART_OVERRUN_ERROR              0x40
 128 #define UART_CTS                        0x80
 129
 130
 131 enum pl2303_type {
 132         type_0,         /* don't know the difference between type 0 and */
 133         type_1,         /* type 1, until someone from prolific tells us... */
 134         HX,             /* HX version of the pl2303 chip */
 135 };
 136
 137 struct pl2303_serial_private {
 138         enum pl2303_type type;
 139 };
 140
 141 struct pl2303_private {
 142         spinlock_t lock;
 143         u8 line_control;
 144         u8 line_status;
 145 };
 146
 147 static int pl2303_vendor_read(__u16 value, __u16 index,
 148                 struct usb_serial *serial, unsigned char *buf)
 149 {
 150         int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 151                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 152                         value, index, buf, 1, 100);
 153         dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x  %d - %x\n",
 154                 VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, value, index,
 155                 res, buf[0]);
 156         return res;
 157 }
 158
 159 static int pl2303_vendor_write(__u16 value, __u16 index,
 160                 struct usb_serial *serial)
 161 {
 162         int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 163                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 164                         value, index, NULL, 0, 100);
 165         dev_dbg(&serial->interface->dev, "0x%x:0x%x:0x%x:0x%x  %d\n",
 166                 VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, value, index,
 167                 res);
 168         return res;
 169 }
 170
 171 static int pl2303_startup(struct usb_serial *serial)
 172 {
 173         struct pl2303_serial_private *spriv;
 174         enum pl2303_type type = type_0;
 175         unsigned char *buf;
 176
 177         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 178         if (!spriv)
 179                 return -ENOMEM;
 180
 181         buf = kmalloc(10, GFP_KERNEL);
 182         if (!buf) {
 183                 kfree(spriv);
 184                 return -ENOMEM;
 185         }
 186
 187         if (serial->dev->descriptor.bDeviceClass == 0x02)
 188                 type = type_0;
 189         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 190                 type = HX;
 191         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 192                 type = type_1;
 193         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 194                 type = type_1;
 195         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 196
 197         spriv->type = type;
 198         usb_set_serial_data(serial, spriv);
 199
 200         pl2303_vendor_read(0x8484, 0, serial, buf);
 201         pl2303_vendor_write(0x0404, 0, serial);
 202         pl2303_vendor_read(0x8484, 0, serial, buf);
 203         pl2303_vendor_read(0x8383, 0, serial, buf);
 204         pl2303_vendor_read(0x8484, 0, serial, buf);
 205         pl2303_vendor_write(0x0404, 1, serial);
 206         pl2303_vendor_read(0x8484, 0, serial, buf);
 207         pl2303_vendor_read(0x8383, 0, serial, buf);
 208         pl2303_vendor_write(0, 1, serial);
 209         pl2303_vendor_write(1, 0, serial);
 210         if (type == HX)
 211                 pl2303_vendor_write(2, 0x44, serial);
 212         else
 213                 pl2303_vendor_write(2, 0x24, serial);
 214
 215         kfree(buf);
 216         return 0;
 217 }
 218
 219 static void pl2303_release(struct usb_serial *serial)
 220 {
 221         struct pl2303_serial_private *spriv;
 222
 223         spriv = usb_get_serial_data(serial);
 224         kfree(spriv);
 225 }
 226
 227 static int pl2303_port_probe(struct usb_serial_port *port)
 228 {
 229         struct pl2303_private *priv;
 230
 231         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 232         if (!priv)
 233                 return -ENOMEM;
 234
 235         spin_lock_init(&priv->lock);
 236
 237         usb_set_serial_port_data(port, priv);
 238
 239         port->port.drain_delay = 256;
 240
 241         return 0;
 242 }
 243
 244 static int pl2303_port_remove(struct usb_serial_port *port)
 245 {
 246         struct pl2303_private *priv;
 247
 248         priv = usb_get_serial_port_data(port);
 249         kfree(priv);
 250
 251         return 0;
 252 }
 253
 254 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 255 {
 256         struct usb_device *dev = port->serial->dev;
 257         int retval;
 258
 259         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 260                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 261                                  value, 0, NULL, 0, 100);
 262         dev_dbg(&port->dev, "%s - value = %d, retval = %d\n", __func__,
 263                 value, retval);
 264         return retval;
 265 }
 266
 267 static void pl2303_encode_baudrate(struct tty_struct *tty,
 268                                         struct usb_serial_port *port,
 269                                         u8 buf[4])
 270 {
 271         const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
 272                                  4800, 7200, 9600, 14400, 19200, 28800, 38400,
 273                                  57600, 115200, 230400, 460800, 500000, 614400,
 274                                  921600, 1228800, 2457600, 3000000, 6000000 };
 275
 276         struct usb_serial *serial = port->serial;
 277         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 278         int baud;
 279         int i;
 280
 281         /*
 282          * NOTE: Only the values defined in baud_sup are supported!
 283          *       => if unsupported values are set, the PL2303 seems to use
 284          *          9600 baud (at least my PL2303X always does)
 285          */
 286         baud = tty_get_baud_rate(tty);
 287         dev_dbg(&port->dev, "baud requested = %d\n", baud);
 288         if (!baud)
 289                 return;
 290
 291         /* Set baudrate to nearest supported value */
 292         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 293                 if (baud_sup[i] > baud)
 294                         break;
 295         }
 296
 297         if (i == ARRAY_SIZE(baud_sup))
 298                 baud = baud_sup[i - 1];
 299         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 300                 baud = baud_sup[i - 1];
 301         else
 302                 baud = baud_sup[i];
 303
 304         /* type_0, type_1 only support up to 1228800 baud */
 305         if (spriv->type != HX)
 306                 baud = min_t(int, baud, 1228800);
 307
 308         if (spriv->type != HX || baud <= 115200) {
 309                 /* Direct (standard) baud rate encoding method */
 310                 put_unaligned_le32(baud, buf);
 311         } else {
 312                 /*
 313                  * NOTE: it's not clear if the type_0/1 chips
 314                  * support this method
 315                  *
 316                  * Apparently the formula for higher speeds is:
 317                  * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
 318                  */
 319                 unsigned tmp = 12000000 * 32 / baud;
 320                 buf[3] = 0x80;
 321                 buf[2] = 0;
 322                 buf[1] = (tmp >= 256);
 323                 while (tmp >= 256) {
 324                         tmp >>= 2;
 325                         buf[1] <<= 1;
 326                 }
 327                 buf[0] = tmp;
 328         }
 329
 330         /* Save resulting baud rate */
 331         tty_encode_baud_rate(tty, baud, baud);
 332         dev_dbg(&port->dev, "baud set = %d\n", baud);
 333 }
 334
 335 static void pl2303_set_termios(struct tty_struct *tty,
 336                 struct usb_serial_port *port, struct ktermios *old_termios)
 337 {
 338         struct usb_serial *serial = port->serial;
 339         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 340         struct pl2303_private *priv = usb_get_serial_port_data(port);
 341         unsigned long flags;
 342         unsigned char *buf;
 343         int i;
 344         u8 control;
 345
 346         /*
 347          * The PL2303 is reported to lose bytes if you change serial settings
 348          * even to the same values as before. Thus we actually need to filter
 349          * in this specific case.
 350          */
 351         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 352                 return;
 353
 354         buf = kzalloc(7, GFP_KERNEL);
 355         if (!buf) {
 356                 dev_err(&port->dev, "%s - out of memory.\n", __func__);
 357                 /* Report back no change occurred */
 358                 if (old_termios)
 359                         tty->termios = *old_termios;
 360                 return;
 361         }
 362
 363         i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 364                             GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 365                             0, 0, buf, 7, 100);
 366         dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %7ph\n", i, buf);
 367
 368         if (C_CSIZE(tty)) {
 369                 switch (C_CSIZE(tty)) {
 370                 case CS5:
 371                         buf[6] = 5;
 372                         break;
 373                 case CS6:
 374                         buf[6] = 6;
 375                         break;
 376                 case CS7:
 377                         buf[6] = 7;
 378                         break;
 379                 default:
 380                 case CS8:
 381                         buf[6] = 8;
 382                 }
 383                 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 384         }
 385
 386         /* For reference buf[0]:buf[3] baud rate value */
 387         pl2303_encode_baudrate(tty, port, &buf[0]);
 388
 389         /* For reference buf[4]=0 is 1 stop bits */
 390         /* For reference buf[4]=1 is 1.5 stop bits */
 391         /* For reference buf[4]=2 is 2 stop bits */
 392         if (C_CSTOPB(tty)) {
 393                 /*
 394                  * NOTE: Comply with "real" UARTs / RS232:
 395                  *       use 1.5 instead of 2 stop bits with 5 data bits
 396                  */
 397                 if (C_CSIZE(tty) == CS5) {
 398                         buf[4] = 1;
 399                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 400                 } else {
 401                         buf[4] = 2;
 402                         dev_dbg(&port->dev, "stop bits = 2\n");
 403                 }
 404         } else {
 405                 buf[4] = 0;
 406                 dev_dbg(&port->dev, "stop bits = 1\n");
 407         }
 408
 409         if (C_PARENB(tty)) {
 410                 /* For reference buf[5]=0 is none parity */
 411                 /* For reference buf[5]=1 is odd parity */
 412                 /* For reference buf[5]=2 is even parity */
 413                 /* For reference buf[5]=3 is mark parity */
 414                 /* For reference buf[5]=4 is space parity */
 415                 if (C_PARODD(tty)) {
 416                         if (tty->termios.c_cflag & CMSPAR) {
 417                                 buf[5] = 3;
 418                                 dev_dbg(&port->dev, "parity = mark\n");
 419                         } else {
 420                                 buf[5] = 1;
 421                                 dev_dbg(&port->dev, "parity = odd\n");
 422                         }
 423                 } else {
 424                         if (tty->termios.c_cflag & CMSPAR) {
 425                                 buf[5] = 4;
 426                                 dev_dbg(&port->dev, "parity = space\n");
 427                         } else {
 428                                 buf[5] = 2;
 429                                 dev_dbg(&port->dev, "parity = even\n");
 430                         }
 431                 }
 432         } else {
 433                 buf[5] = 0;
 434                 dev_dbg(&port->dev, "parity = none\n");
 435         }
 436
 437         i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 438                             SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 439                             0, 0, buf, 7, 100);
 440         dev_dbg(&port->dev, "0x21:0x20:0:0  %d\n", i);
 441
 442         /* change control lines if we are switching to or from B0 */
 443         spin_lock_irqsave(&priv->lock, flags);
 444         control = priv->line_control;
 445         if (C_BAUD(tty) == B0)
 446                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 447         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 448                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 449         if (control != priv->line_control) {
 450                 control = priv->line_control;
 451                 spin_unlock_irqrestore(&priv->lock, flags);
 452                 pl2303_set_control_lines(port, control);
 453         } else {
 454                 spin_unlock_irqrestore(&priv->lock, flags);
 455         }
 456
 457         memset(buf, 0, 7);
 458         i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 459                             GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 460                             0, 0, buf, 7, 100);
 461         dev_dbg(&port->dev, "0xa1:0x21:0:0  %d - %7ph\n", i, buf);
 462
 463         if (C_CRTSCTS(tty)) {
 464                 if (spriv->type == HX)
 465                         pl2303_vendor_write(0x0, 0x61, serial);
 466                 else
 467                         pl2303_vendor_write(0x0, 0x41, serial);
 468         } else {
 469                 pl2303_vendor_write(0x0, 0x0, serial);
 470         }
 471
 472         kfree(buf);
 473 }
 474
 475 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 476 {
 477         struct pl2303_private *priv = usb_get_serial_port_data(port);
 478         unsigned long flags;
 479         u8 control;
 480
 481         spin_lock_irqsave(&priv->lock, flags);
 482         /* Change DTR and RTS */
 483         if (on)
 484                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 485         else
 486                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 487         control = priv->line_control;
 488         spin_unlock_irqrestore(&priv->lock, flags);
 489         pl2303_set_control_lines(port, control);
 490 }
 491
 492 static void pl2303_close(struct usb_serial_port *port)
 493 {
 494         usb_serial_generic_close(port);
 495         usb_kill_urb(port->interrupt_in_urb);
 496 }
 497
 498 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 499 {
 500         struct usb_serial *serial = port->serial;
 501         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 502         int result;
 503
 504         if (spriv->type != HX) {
 505                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 506                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 507         } else {
 508                 /* reset upstream data pipes */
 509                 pl2303_vendor_write(8, 0, serial);
 510                 pl2303_vendor_write(9, 0, serial);
 511         }
 512
 513         /* Setup termios */
 514         if (tty)
 515                 pl2303_set_termios(tty, port, NULL);
 516
 517         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 518         if (result) {
 519                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 520                         " error %d\n", __func__, result);
 521                 return result;
 522         }
 523
 524         result = usb_serial_generic_open(tty, port);
 525         if (result) {
 526                 usb_kill_urb(port->interrupt_in_urb);
 527                 return result;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int pl2303_tiocmset(struct tty_struct *tty,
 534                            unsigned int set, unsigned int clear)
 535 {
 536         struct usb_serial_port *port = tty->driver_data;
 537         struct pl2303_private *priv = usb_get_serial_port_data(port);
 538         unsigned long flags;
 539         u8 control;
 540         int ret;
 541
 542         spin_lock_irqsave(&priv->lock, flags);
 543         if (set & TIOCM_RTS)
 544                 priv->line_control |= CONTROL_RTS;
 545         if (set & TIOCM_DTR)
 546                 priv->line_control |= CONTROL_DTR;
 547         if (clear & TIOCM_RTS)
 548                 priv->line_control &= ~CONTROL_RTS;
 549         if (clear & TIOCM_DTR)
 550                 priv->line_control &= ~CONTROL_DTR;
 551         control = priv->line_control;
 552         spin_unlock_irqrestore(&priv->lock, flags);
 553
 554         ret = pl2303_set_control_lines(port, control);
 555         if (ret)
 556                 return usb_translate_errors(ret);
 557
 558         return 0;
 559 }
 560
 561 static int pl2303_tiocmget(struct tty_struct *tty)
 562 {
 563         struct usb_serial_port *port = tty->driver_data;
 564         struct pl2303_private *priv = usb_get_serial_port_data(port);
 565         unsigned long flags;
 566         unsigned int mcr;
 567         unsigned int status;
 568         unsigned int result;
 569
 570         spin_lock_irqsave(&priv->lock, flags);
 571         mcr = priv->line_control;
 572         status = priv->line_status;
 573         spin_unlock_irqrestore(&priv->lock, flags);
 574
 575         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 576                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 577                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 578                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 579                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 580                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 581
 582         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 583
 584         return result;
 585 }
 586
 587 static int pl2303_carrier_raised(struct usb_serial_port *port)
 588 {
 589         struct pl2303_private *priv = usb_get_serial_port_data(port);
 590         if (priv->line_status & UART_DCD)
 591                 return 1;
 592         return 0;
 593 }
 594
 595 static int pl2303_tiocmiwait(struct tty_struct *tty, unsigned long arg)
 596 {
 597         struct usb_serial_port *port = tty->driver_data;
 598         struct pl2303_private *priv = usb_get_serial_port_data(port);
 599         unsigned long flags;
 600         unsigned int prevstatus;
 601         unsigned int status;
 602         unsigned int changed;
 603
 604         spin_lock_irqsave(&priv->lock, flags);
 605         prevstatus = priv->line_status;
 606         spin_unlock_irqrestore(&priv->lock, flags);
 607
 608         while (1) {
 609                 interruptible_sleep_on(&port->port.delta_msr_wait);
 610                 /* see if a signal did it */
 611                 if (signal_pending(current))
 612                         return -ERESTARTSYS;
 613
 614                 if (port->serial->disconnected)
 615                         return -EIO;
 616
 617                 spin_lock_irqsave(&priv->lock, flags);
 618                 status = priv->line_status;
 619                 spin_unlock_irqrestore(&priv->lock, flags);
 620
 621                 changed = prevstatus ^ status;
 622
 623                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 624                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 625                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 626                     ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
 627                         return 0;
 628                 }
 629                 prevstatus = status;
 630         }
 631         /* NOTREACHED */
 632         return 0;
 633 }
 634
 635 static int pl2303_ioctl(struct tty_struct *tty,
 636                         unsigned int cmd, unsigned long arg)
 637 {
 638         struct serial_struct ser;
 639         struct usb_serial_port *port = tty->driver_data;
 640
 641         dev_dbg(&port->dev, "%s cmd = 0x%04x\n", __func__, cmd);
 642
 643         switch (cmd) {
 644         case TIOCGSERIAL:
 645                 memset(&ser, 0, sizeof ser);
 646                 ser.type = PORT_16654;
 647                 ser.line = port->minor;
 648                 ser.port = port->port_number;
 649                 ser.baud_base = 460800;
 650
 651                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
 652                         return -EFAULT;
 653
 654                 return 0;
 655         default:
 656                 dev_dbg(&port->dev, "%s not supported = 0x%04x\n", __func__, cmd);
 657                 break;
 658         }
 659         return -ENOIOCTLCMD;
 660 }
 661
 662 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
 663 {
 664         struct usb_serial_port *port = tty->driver_data;
 665         struct usb_serial *serial = port->serial;
 666         u16 state;
 667         int result;
 668
 669         if (break_state == 0)
 670                 state = BREAK_OFF;
 671         else
 672                 state = BREAK_ON;
 673         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 674                         state == BREAK_OFF ? "off" : "on");
 675
 676         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 677                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 678                                  0, NULL, 0, 100);
 679         if (result)
 680                 dev_err(&port->dev, "error sending break = %d\n", result);
 681 }
 682
 683 static void pl2303_update_line_status(struct usb_serial_port *port,
 684                                       unsigned char *data,
 685                                       unsigned int actual_length)
 686 {
 687
 688         struct pl2303_private *priv = usb_get_serial_port_data(port);
 689         struct tty_struct *tty;
 690         unsigned long flags;
 691         u8 status_idx = UART_STATE;
 692         u8 length = UART_STATE + 1;
 693         u8 prev_line_status;
 694         u16 idv, idp;
 695
 696         idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
 697         idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
 698
 699
 700         if (idv == SIEMENS_VENDOR_ID) {
 701                 if (idp == SIEMENS_PRODUCT_ID_X65 ||
 702                     idp == SIEMENS_PRODUCT_ID_SX1 ||
 703                     idp == SIEMENS_PRODUCT_ID_X75) {
 704
 705                         length = 1;
 706                         status_idx = 0;
 707                 }
 708         }
 709
 710         if (actual_length < length)
 711                 return;
 712
 713         /* Save off the uart status for others to look at */
 714         spin_lock_irqsave(&priv->lock, flags);
 715         prev_line_status = priv->line_status;
 716         priv->line_status = data[status_idx];
 717         spin_unlock_irqrestore(&priv->lock, flags);
 718         if (priv->line_status & UART_BREAK_ERROR)
 719                 usb_serial_handle_break(port);
 720         wake_up_interruptible(&port->port.delta_msr_wait);
 721
 722         tty = tty_port_tty_get(&port->port);
 723         if (!tty)
 724                 return;
 725         if ((priv->line_status ^ prev_line_status) & UART_DCD)
 726                 usb_serial_handle_dcd_change(port, tty,
 727                                 priv->line_status & UART_DCD);
 728         tty_kref_put(tty);
 729 }
 730
 731 static void pl2303_read_int_callback(struct urb *urb)
 732 {
 733         struct usb_serial_port *port =  urb->context;
 734         unsigned char *data = urb->transfer_buffer;
 735         unsigned int actual_length = urb->actual_length;
 736         int status = urb->status;
 737         int retval;
 738
 739         switch (status) {
 740         case 0:
 741                 /* success */
 742                 break;
 743         case -ECONNRESET:
 744         case -ENOENT:
 745         case -ESHUTDOWN:
 746                 /* this urb is terminated, clean up */
 747                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 748                         __func__, status);
 749                 return;
 750         default:
 751                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 752                         __func__, status);
 753                 goto exit;
 754         }
 755
 756         usb_serial_debug_data(&port->dev, __func__,
 757                               urb->actual_length, urb->transfer_buffer);
 758
 759         pl2303_update_line_status(port, data, actual_length);
 760
 761 exit:
 762         retval = usb_submit_urb(urb, GFP_ATOMIC);
 763         if (retval)
 764                 dev_err(&port->dev,
 765                         "%s - usb_submit_urb failed with result %d\n",
 766                         __func__, retval);
 767 }
 768
 769 static void pl2303_process_read_urb(struct urb *urb)
 770 {
 771         struct usb_serial_port *port = urb->context;
 772         struct pl2303_private *priv = usb_get_serial_port_data(port);
 773         unsigned char *data = urb->transfer_buffer;
 774         char tty_flag = TTY_NORMAL;
 775         unsigned long flags;
 776         u8 line_status;
 777         int i;
 778
 779         /* update line status */
 780         spin_lock_irqsave(&priv->lock, flags);
 781         line_status = priv->line_status;
 782         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 783         spin_unlock_irqrestore(&priv->lock, flags);
 784         wake_up_interruptible(&port->port.delta_msr_wait);
 785
 786         if (!urb->actual_length)
 787                 return;
 788
 789         /* break takes precedence over parity, */
 790         /* which takes precedence over framing errors */
 791         if (line_status & UART_BREAK_ERROR)
 792                 tty_flag = TTY_BREAK;
 793         else if (line_status & UART_PARITY_ERROR)
 794                 tty_flag = TTY_PARITY;
 795         else if (line_status & UART_FRAME_ERROR)
 796                 tty_flag = TTY_FRAME;
 797
 798         if (tty_flag != TTY_NORMAL)
 799                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
 800                                                                 tty_flag);
 801         /* overrun is special, not associated with a char */
 802         if (line_status & UART_OVERRUN_ERROR)
 803                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 804
 805         if (port->port.console && port->sysrq) {
 806                 for (i = 0; i < urb->actual_length; ++i)
 807                         if (!usb_serial_handle_sysrq_char(port, data[i]))
 808                                 tty_insert_flip_char(&port->port, data[i],
 809                                                 tty_flag);
 810         } else {
 811                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
 812                                                         urb->actual_length);
 813         }
 814
 815         tty_flip_buffer_push(&port->port);
 816 }
 817
 818 /* All of the device info needed for the PL2303 SIO serial converter */
 819 static struct usb_serial_driver pl2303_device = {
 820         .driver = {
 821                 .owner =        THIS_MODULE,
 822                 .name =         "pl2303",
 823         },
 824         .id_table =             id_table,
 825         .num_ports =            1,
 826         .bulk_in_size =         256,
 827         .bulk_out_size =        256,
 828         .open =                 pl2303_open,
 829         .close =                pl2303_close,
 830         .dtr_rts =              pl2303_dtr_rts,
 831         .carrier_raised =       pl2303_carrier_raised,
 832         .ioctl =                pl2303_ioctl,
 833         .break_ctl =            pl2303_break_ctl,
 834         .set_termios =          pl2303_set_termios,
 835         .tiocmget =             pl2303_tiocmget,
 836         .tiocmset =             pl2303_tiocmset,
 837         .tiocmiwait =           pl2303_tiocmiwait,
 838         .process_read_urb =     pl2303_process_read_urb,
 839         .read_int_callback =    pl2303_read_int_callback,
 840         .attach =               pl2303_startup,
 841         .release =              pl2303_release,
 842         .port_probe =           pl2303_port_probe,
 843         .port_remove =          pl2303_port_remove,
 844 };
 845
 846 static struct usb_serial_driver * const serial_drivers[] = {
 847         &pl2303_device, NULL
 848 };
 849
 850 module_usb_serial_driver(serial_drivers, id_table);
 851
 852 MODULE_DESCRIPTION(DRIVER_DESC);
 853 MODULE_LICENSE("GPL");