drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2004 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 modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  * See Documentation/usb/usb-serial.txt for more information on using this driver
  15  *
  16  * 2002_Mar_26 gkh
  17  *      allowed driver to work properly if there is no tty assigned to a port
  18  *      (this happens for serial console devices.)
  19  *
  20  * 2001_Oct_06 gkh
  21  *      Added RTS and DTR line control.  Thanks to joe@bndlg.de for parts of it.
  22  *
  23  * 2001_Sep_19 gkh
  24  *      Added break support.
  25  *
  26  * 2001_Aug_30 gkh
  27  *      fixed oops in write_bulk_callback.
  28  *
  29  * 2001_Aug_28 gkh
  30  *      reworked buffer logic to be like other usb-serial drivers.  Hopefully
  31  *      removing some reported problems.
  32  *
  33  * 2001_Jun_06 gkh
  34  *      finished porting to 2.4 format.
  35  *
  36  */
  37
  38 #include <linux/config.h>
  39 #include <linux/kernel.h>
  40 #include <linux/errno.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/tty.h>
  44 #include <linux/tty_driver.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/module.h>
  48 #include <linux/moduleparam.h>
  49 #include <linux/spinlock.h>
  50 #include <asm/uaccess.h>
  51 #include <linux/usb.h>
  52 #include "usb-serial.h"
  53 #include "pl2303.h"
  54
  55 /*
  56  * Version Information
  57  */
  58 #define DRIVER_VERSION "v0.11"
  59 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  60
  61 static int debug;
  62
  63 static struct usb_device_id id_table [] = {
  64         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  65         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  66         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  67         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  68         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  69         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  70         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  71         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  72         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  73         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  74         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  75         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  76         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  77         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  78         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  79         { }                                     /* Terminating entry */
  80 };
  81
  82 MODULE_DEVICE_TABLE (usb, id_table);
  83
  84 static struct usb_driver pl2303_driver = {
  85         .owner =        THIS_MODULE,
  86         .name =         "pl2303",
  87         .probe =        usb_serial_probe,
  88         .disconnect =   usb_serial_disconnect,
  89         .id_table =     id_table,
  90 };
  91
  92 #define SET_LINE_REQUEST_TYPE           0x21
  93 #define SET_LINE_REQUEST                0x20
  94
  95 #define SET_CONTROL_REQUEST_TYPE        0x21
  96 #define SET_CONTROL_REQUEST             0x22
  97 #define CONTROL_DTR                     0x01
  98 #define CONTROL_RTS                     0x02
  99
 100 #define BREAK_REQUEST_TYPE              0x21
 101 #define BREAK_REQUEST                   0x23
 102 #define BREAK_ON                        0xffff
 103 #define BREAK_OFF                       0x0000
 104
 105 #define GET_LINE_REQUEST_TYPE           0xa1
 106 #define GET_LINE_REQUEST                0x21
 107
 108 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 109 #define VENDOR_WRITE_REQUEST            0x01
 110
 111 #define VENDOR_READ_REQUEST_TYPE        0xc0
 112 #define VENDOR_READ_REQUEST             0x01
 113
 114 #define UART_STATE                      0x08
 115 #define UART_STATE_TRANSIENT_MASK       0x74
 116 #define UART_DCD                        0x01
 117 #define UART_DSR                        0x02
 118 #define UART_BREAK_ERROR                0x04
 119 #define UART_RING                       0x08
 120 #define UART_FRAME_ERROR                0x10
 121 #define UART_PARITY_ERROR               0x20
 122 #define UART_OVERRUN_ERROR              0x40
 123 #define UART_CTS                        0x80
 124
 125 /* function prototypes for a PL2303 serial converter */
 126 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 127 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 128 static void pl2303_set_termios (struct usb_serial_port *port,
 129                                 struct termios *old);
 130 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 131                          unsigned int cmd, unsigned long arg);
 132 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 133 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 134 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 135 static int pl2303_write (struct usb_serial_port *port, int from_user,
 136                          const unsigned char *buf, int count);
 137 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 138 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
 139 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 140                             unsigned int set, unsigned int clear);
 141 static int pl2303_startup (struct usb_serial *serial);
 142 static void pl2303_shutdown (struct usb_serial *serial);
 143
 144
 145 /* All of the device info needed for the PL2303 SIO serial converter */
 146 static struct usb_serial_device_type pl2303_device = {
 147         .owner =                THIS_MODULE,
 148         .name =                 "PL-2303",
 149         .id_table =             id_table,
 150         .num_interrupt_in =     NUM_DONT_CARE,
 151         .num_bulk_in =          1,
 152         .num_bulk_out =         1,
 153         .num_ports =            1,
 154         .open =                 pl2303_open,
 155         .close =                pl2303_close,
 156         .write =                pl2303_write,
 157         .ioctl =                pl2303_ioctl,
 158         .break_ctl =            pl2303_break_ctl,
 159         .set_termios =          pl2303_set_termios,
 160         .tiocmget =             pl2303_tiocmget,
 161         .tiocmset =             pl2303_tiocmset,
 162         .read_bulk_callback =   pl2303_read_bulk_callback,
 163         .read_int_callback =    pl2303_read_int_callback,
 164         .write_bulk_callback =  pl2303_write_bulk_callback,
 165         .attach =               pl2303_startup,
 166         .shutdown =             pl2303_shutdown,
 167 };
 168
 169 enum pl2303_type {
 170         type_0,         /* don't know the difference between type 0 and */
 171         type_1,         /* type 1, until someone from prolific tells us... */
 172         HX,             /* HX version of the pl2303 chip */
 173 };
 174
 175 struct pl2303_private {
 176         spinlock_t lock;
 177         wait_queue_head_t delta_msr_wait;
 178         u8 line_control;
 179         u8 line_status;
 180         u8 termios_initialized;
 181         enum pl2303_type type;
 182 };
 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         int i;
 190
 191         if (serial->dev->descriptor.bDeviceClass == 0x02)
 192                 type = type_0;
 193         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 194                 type = HX;
 195         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 196                 type = type_1;
 197         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 198                 type = type_1;
 199         dbg("device type: %d", type);
 200
 201         for (i = 0; i < serial->num_ports; ++i) {
 202                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 203                 if (!priv)
 204                         return -ENOMEM;
 205                 memset (priv, 0x00, sizeof (struct pl2303_private));
 206                 spin_lock_init(&priv->lock);
 207                 init_waitqueue_head(&priv->delta_msr_wait);
 208                 priv->type = type;
 209                 usb_set_serial_port_data(serial->port[i], priv);
 210         }
 211         return 0;
 212 }
 213
 214 static int set_control_lines (struct usb_device *dev, u8 value)
 215 {
 216         int retval;
 217
 218         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 219                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 220                                   value, 0, NULL, 0, 100);
 221         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 222         return retval;
 223 }
 224
 225 static int pl2303_write (struct usb_serial_port *port, int from_user,  const unsigned char *buf, int count)
 226 {
 227         int result;
 228
 229         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 230
 231         if (!count)
 232                 return count;
 233
 234         if (port->write_urb->status == -EINPROGRESS) {
 235                 dbg("%s - already writing", __FUNCTION__);
 236                 return 0;
 237         }
 238
 239         count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
 240         if (from_user) {
 241                 if (copy_from_user (port->write_urb->transfer_buffer, buf, count))
 242                         return -EFAULT;
 243         } else {
 244                 memcpy (port->write_urb->transfer_buffer, buf, count);
 245         }
 246
 247         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
 248
 249         port->write_urb->transfer_buffer_length = count;
 250         port->write_urb->dev = port->serial->dev;
 251         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 252         if (result)
 253                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 254         else
 255                 result = count;
 256
 257         return result;
 258 }
 259
 260
 261
 262 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 263 {
 264         struct usb_serial *serial = port->serial;
 265         struct pl2303_private *priv = usb_get_serial_port_data(port);
 266         unsigned long flags;
 267         unsigned int cflag;
 268         unsigned char *buf;
 269         int baud;
 270         int i;
 271         u8 control;
 272
 273         dbg("%s -  port %d", __FUNCTION__, port->number);
 274
 275         if ((!port->tty) || (!port->tty->termios)) {
 276                 dbg("%s - no tty structures", __FUNCTION__);
 277                 return;
 278         }
 279
 280         spin_lock_irqsave(&priv->lock, flags);
 281         if (!priv->termios_initialized) {
 282                 *(port->tty->termios) = tty_std_termios;
 283                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 284                 priv->termios_initialized = 1;
 285         }
 286         spin_unlock_irqrestore(&priv->lock, flags);
 287
 288         cflag = port->tty->termios->c_cflag;
 289         /* check that they really want us to change something */
 290         if (old_termios) {
 291                 if ((cflag == old_termios->c_cflag) &&
 292                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 293                     dbg("%s - nothing to change...", __FUNCTION__);
 294                     return;
 295                 }
 296         }
 297
 298         buf = kmalloc (7, GFP_KERNEL);
 299         if (!buf) {
 300                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 301                 return;
 302         }
 303         memset (buf, 0x00, 0x07);
 304
 305         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 306                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 307                              0, 0, buf, 7, 100);
 308         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 309              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 310
 311
 312         if (cflag & CSIZE) {
 313                 switch (cflag & CSIZE) {
 314                         case CS5:       buf[6] = 5;     break;
 315                         case CS6:       buf[6] = 6;     break;
 316                         case CS7:       buf[6] = 7;     break;
 317                         default:
 318                         case CS8:       buf[6] = 8;     break;
 319                 }
 320                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 321         }
 322
 323         baud = 0;
 324         switch (cflag & CBAUD) {
 325                 case B0:        baud = 0;       break;
 326                 case B75:       baud = 75;      break;
 327                 case B150:      baud = 150;     break;
 328                 case B300:      baud = 300;     break;
 329                 case B600:      baud = 600;     break;
 330                 case B1200:     baud = 1200;    break;
 331                 case B1800:     baud = 1800;    break;
 332                 case B2400:     baud = 2400;    break;
 333                 case B4800:     baud = 4800;    break;
 334                 case B9600:     baud = 9600;    break;
 335                 case B19200:    baud = 19200;   break;
 336                 case B38400:    baud = 38400;   break;
 337                 case B57600:    baud = 57600;   break;
 338                 case B115200:   baud = 115200;  break;
 339                 case B230400:   baud = 230400;  break;
 340                 case B460800:   baud = 460800;  break;
 341                 default:
 342                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 343                         break;
 344         }
 345         dbg("%s - baud = %d", __FUNCTION__, baud);
 346         if (baud) {
 347                 buf[0] = baud & 0xff;
 348                 buf[1] = (baud >> 8) & 0xff;
 349                 buf[2] = (baud >> 16) & 0xff;
 350                 buf[3] = (baud >> 24) & 0xff;
 351         }
 352
 353         /* For reference buf[4]=0 is 1 stop bits */
 354         /* For reference buf[4]=1 is 1.5 stop bits */
 355         /* For reference buf[4]=2 is 2 stop bits */
 356         if (cflag & CSTOPB) {
 357                 buf[4] = 2;
 358                 dbg("%s - stop bits = 2", __FUNCTION__);
 359         } else {
 360                 buf[4] = 0;
 361                 dbg("%s - stop bits = 1", __FUNCTION__);
 362         }
 363
 364         if (cflag & PARENB) {
 365                 /* For reference buf[5]=0 is none parity */
 366                 /* For reference buf[5]=1 is odd parity */
 367                 /* For reference buf[5]=2 is even parity */
 368                 /* For reference buf[5]=3 is mark parity */
 369                 /* For reference buf[5]=4 is space parity */
 370                 if (cflag & PARODD) {
 371                         buf[5] = 1;
 372                         dbg("%s - parity = odd", __FUNCTION__);
 373                 } else {
 374                         buf[5] = 2;
 375                         dbg("%s - parity = even", __FUNCTION__);
 376                 }
 377         } else {
 378                 buf[5] = 0;
 379                 dbg("%s - parity = none", __FUNCTION__);
 380         }
 381
 382         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 383                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 384                              0, 0, buf, 7, 100);
 385         dbg ("0x21:0x20:0:0  %d", i);
 386
 387         /* change control lines if we are switching to or from B0 */
 388         spin_lock_irqsave(&priv->lock, flags);
 389         control = priv->line_control;
 390         if ((cflag & CBAUD) == B0)
 391                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 392         else
 393                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 394         if (control != priv->line_control) {
 395                 control = priv->line_control;
 396                 spin_unlock_irqrestore(&priv->lock, flags);
 397                 set_control_lines(serial->dev, control);
 398         } else {
 399                 spin_unlock_irqrestore(&priv->lock, flags);
 400         }
 401
 402         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 403
 404         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 405                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 406                              0, 0, buf, 7, 100);
 407         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 408              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 409
 410         if (cflag & CRTSCTS) {
 411                 __u16 index;
 412                 if (priv->type == HX)
 413                         index = 0x61;
 414                 else
 415                         index = 0x41;
 416                 i = usb_control_msg(serial->dev,
 417                                     usb_sndctrlpipe(serial->dev, 0),
 418                                     VENDOR_WRITE_REQUEST,
 419                                     VENDOR_WRITE_REQUEST_TYPE,
 420                                     0x0, index, NULL, 0, 100);
 421                 dbg ("0x40:0x1:0x0:0x%x  %d", index, i);
 422         }
 423
 424         kfree (buf);
 425 }
 426
 427 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 428 {
 429         struct termios tmp_termios;
 430         struct usb_serial *serial = port->serial;
 431         struct pl2303_private *priv = usb_get_serial_port_data(port);
 432         unsigned char *buf;
 433         int result;
 434
 435         dbg("%s -  port %d", __FUNCTION__, port->number);
 436
 437         usb_clear_halt(serial->dev, port->write_urb->pipe);
 438         usb_clear_halt(serial->dev, port->read_urb->pipe);
 439
 440         buf = kmalloc(10, GFP_KERNEL);
 441         if (buf==NULL)
 442                 return -ENOMEM;
 443
 444 #define FISH(a,b,c,d)                                                           \
 445         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 446                                b, a, c, d, buf, 1, 100);                        \
 447         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 448
 449 #define SOUP(a,b,c,d)                                                           \
 450         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 451                                b, a, c, d, NULL, 0, 100);                       \
 452         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 453
 454         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 455         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 456         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 457         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 458         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 459         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 460         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 461         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 462         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 463         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
 464
 465         if (priv->type == HX) {
 466                 /* HX chip */
 467                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
 468                 /* reset upstream data pipes */
 469                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
 470                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
 471         } else {
 472                 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
 473         }
 474
 475         kfree(buf);
 476
 477         /* Setup termios */
 478         if (port->tty) {
 479                 pl2303_set_termios (port, &tmp_termios);
 480         }
 481
 482         //FIXME: need to assert RTS and DTR if CRTSCTS off
 483
 484         dbg("%s - submitting read urb", __FUNCTION__);
 485         port->read_urb->dev = serial->dev;
 486         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 487         if (result) {
 488                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 489                 pl2303_close (port, NULL);
 490                 return -EPROTO;
 491         }
 492
 493         dbg("%s - submitting interrupt urb", __FUNCTION__);
 494         port->interrupt_in_urb->dev = serial->dev;
 495         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 496         if (result) {
 497                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 498                 pl2303_close (port, NULL);
 499                 return -EPROTO;
 500         }
 501         return 0;
 502 }
 503
 504
 505 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 506 {
 507         struct pl2303_private *priv;
 508         unsigned long flags;
 509         unsigned int c_cflag;
 510         int result;
 511
 512         dbg("%s - port %d", __FUNCTION__, port->number);
 513
 514         /* shutdown our urbs */
 515         dbg("%s - shutting down urbs", __FUNCTION__);
 516         result = usb_unlink_urb (port->write_urb);
 517         if (result)
 518                 dbg("%s - usb_unlink_urb (write_urb)"
 519                     " failed with reason: %d", __FUNCTION__,
 520                      result);
 521
 522         result = usb_unlink_urb (port->read_urb);
 523         if (result)
 524                 dbg("%s - usb_unlink_urb (read_urb) "
 525                     "failed with reason: %d", __FUNCTION__,
 526                      result);
 527
 528         result = usb_unlink_urb (port->interrupt_in_urb);
 529         if (result)
 530                 dbg("%s - usb_unlink_urb (interrupt_in_urb)"
 531                     " failed with reason: %d", __FUNCTION__,
 532                      result);
 533
 534         if (port->tty) {
 535                 c_cflag = port->tty->termios->c_cflag;
 536                 if (c_cflag & HUPCL) {
 537                         /* drop DTR and RTS */
 538                         priv = usb_get_serial_port_data(port);
 539                         spin_lock_irqsave(&priv->lock, flags);
 540                         priv->line_control = 0;
 541                         spin_unlock_irqrestore (&priv->lock, flags);
 542                         set_control_lines (port->serial->dev, 0);
 543                 }
 544         }
 545
 546 }
 547
 548 static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
 549                             unsigned int set, unsigned int clear)
 550 {
 551         struct pl2303_private *priv = usb_get_serial_port_data(port);
 552         unsigned long flags;
 553         u8 control;
 554
 555         spin_lock_irqsave (&priv->lock, flags);
 556         if (set & TIOCM_RTS)
 557                 priv->line_control |= CONTROL_RTS;
 558         if (set & TIOCM_DTR)
 559                 priv->line_control |= CONTROL_DTR;
 560         if (clear & TIOCM_RTS)
 561                 priv->line_control &= ~CONTROL_RTS;
 562         if (clear & TIOCM_DTR)
 563                 priv->line_control &= ~CONTROL_DTR;
 564         control = priv->line_control;
 565         spin_unlock_irqrestore (&priv->lock, flags);
 566
 567         return set_control_lines (port->serial->dev, control);
 568 }
 569
 570 static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
 571 {
 572         struct pl2303_private *priv = usb_get_serial_port_data(port);
 573         unsigned long flags;
 574         unsigned int mcr;
 575         unsigned int status;
 576         unsigned int result;
 577
 578         dbg("%s (%d)", __FUNCTION__, port->number);
 579
 580         spin_lock_irqsave (&priv->lock, flags);
 581         mcr = priv->line_control;
 582         status = priv->line_status;
 583         spin_unlock_irqrestore (&priv->lock, flags);
 584
 585         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 586                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 587                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 588                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 589                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 590                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 591
 592         dbg("%s - result = %x", __FUNCTION__, result);
 593
 594         return result;
 595 }
 596
 597 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 598 {
 599         struct pl2303_private *priv = usb_get_serial_port_data(port);
 600         unsigned long flags;
 601         unsigned int prevstatus;
 602         unsigned int status;
 603         unsigned int changed;
 604
 605         spin_lock_irqsave (&priv->lock, flags);
 606         prevstatus = priv->line_status;
 607         spin_unlock_irqrestore (&priv->lock, flags);
 608
 609         while (1) {
 610                 interruptible_sleep_on(&priv->delta_msr_wait);
 611                 /* see if a signal did it */
 612                 if (signal_pending(current))
 613                         return -ERESTARTSYS;
 614
 615                 spin_lock_irqsave (&priv->lock, flags);
 616                 status = priv->line_status;
 617                 spin_unlock_irqrestore (&priv->lock, flags);
 618
 619                 changed=prevstatus^status;
 620
 621                 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
 622                     ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
 623                     ((arg & TIOCM_CD)  && (changed & UART_DCD)) ||
 624                     ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
 625                         return 0;
 626                 }
 627                 prevstatus = status;
 628         }
 629         /* NOTREACHED */
 630         return 0;
 631 }
 632
 633 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 634 {
 635         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 636
 637         switch (cmd) {
 638                 case TIOCMIWAIT:
 639                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 640                         return wait_modem_info(port, arg);
 641
 642                 default:
 643                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 644                         break;
 645         }
 646
 647         return -ENOIOCTLCMD;
 648 }
 649
 650 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 651 {
 652         struct usb_serial *serial = port->serial;
 653         u16 state;
 654         int result;
 655
 656         dbg("%s - port %d", __FUNCTION__, port->number);
 657
 658         if (break_state == 0)
 659                 state = BREAK_OFF;
 660         else
 661                 state = BREAK_ON;
 662         dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
 663
 664         result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 665                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 666                                   0, NULL, 0, 100);
 667         if (result)
 668                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 669 }
 670
 671
 672 static void pl2303_shutdown (struct usb_serial *serial)
 673 {
 674         int i;
 675
 676         dbg("%s", __FUNCTION__);
 677
 678         for (i = 0; i < serial->num_ports; ++i) {
 679                 kfree (usb_get_serial_port_data(serial->port[i]));
 680                 usb_set_serial_port_data(serial->port[i], NULL);
 681         }
 682 }
 683
 684
 685 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 686 {
 687         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 688         struct pl2303_private *priv = usb_get_serial_port_data(port);
 689         unsigned char *data = urb->transfer_buffer;
 690         unsigned long flags;
 691         int status;
 692         u8 uart_state;
 693
 694         dbg("%s (%d)", __FUNCTION__, port->number);
 695
 696         switch (urb->status) {
 697         case 0:
 698                 /* success */
 699                 break;
 700         case -ECONNRESET:
 701         case -ENOENT:
 702         case -ESHUTDOWN:
 703                 /* this urb is terminated, clean up */
 704                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 705                 return;
 706         default:
 707                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 708                 goto exit;
 709         }
 710
 711
 712         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 713
 714         if (urb->actual_length < UART_STATE)
 715                 goto exit;
 716
 717         /* Save off the uart status for others to look at */
 718         uart_state = data[UART_STATE];
 719         spin_lock_irqsave(&priv->lock, flags);
 720         uart_state |= (priv->line_status & UART_STATE_TRANSIENT_MASK);
 721         priv->line_status = uart_state;
 722         spin_unlock_irqrestore(&priv->lock, flags);
 723
 724 exit:
 725         status = usb_submit_urb (urb, GFP_ATOMIC);
 726         if (status)
 727                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 728                         __FUNCTION__, status);
 729 }
 730
 731
 732 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 733 {
 734         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 735         struct pl2303_private *priv = usb_get_serial_port_data(port);
 736         struct tty_struct *tty;
 737         unsigned char *data = urb->transfer_buffer;
 738         unsigned long flags;
 739         int i;
 740         int result;
 741         u8 status;
 742         char tty_flag;
 743
 744         dbg("%s - port %d", __FUNCTION__, port->number);
 745
 746         if (urb->status) {
 747                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 748                 if (!port->open_count) {
 749                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 750                         return;
 751                 }
 752                 if (urb->status == -EPROTO) {
 753                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 754                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 755                         urb->status = 0;
 756                         urb->dev = port->serial->dev;
 757                         result = usb_submit_urb(urb, GFP_ATOMIC);
 758                         if (result)
 759                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 760                         return;
 761                 }
 762                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 763                 return;
 764         }
 765
 766         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 767
 768         /* get tty_flag from status */
 769         tty_flag = TTY_NORMAL;
 770
 771         spin_lock_irqsave(&priv->lock, flags);
 772         status = priv->line_status;
 773         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 774         spin_unlock_irqrestore(&priv->lock, flags);
 775         wake_up_interruptible (&priv->delta_msr_wait);
 776
 777         /* break takes precedence over parity, */
 778         /* which takes precedence over framing errors */
 779         if (status & UART_BREAK_ERROR )
 780                 tty_flag = TTY_BREAK;
 781         else if (status & UART_PARITY_ERROR)
 782                 tty_flag = TTY_PARITY;
 783         else if (status & UART_FRAME_ERROR)
 784                 tty_flag = TTY_FRAME;
 785         dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
 786
 787         tty = port->tty;
 788         if (tty && urb->actual_length) {
 789                 /* overrun is special, not associated with a char */
 790                 if (status & UART_OVERRUN_ERROR)
 791                         tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 792
 793                 for (i = 0; i < urb->actual_length; ++i) {
 794                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 795                                 tty_flip_buffer_push(tty);
 796                         }
 797                         tty_insert_flip_char (tty, data[i], tty_flag);
 798                 }
 799                 tty_flip_buffer_push (tty);
 800         }
 801
 802         /* Schedule the next read _if_ we are still open */
 803         if (port->open_count) {
 804                 urb->dev = port->serial->dev;
 805                 result = usb_submit_urb(urb, GFP_ATOMIC);
 806                 if (result)
 807                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 808         }
 809
 810         return;
 811 }
 812
 813
 814
 815 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 816 {
 817         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 818         int result;
 819
 820         dbg("%s - port %d", __FUNCTION__, port->number);
 821
 822         if (urb->status) {
 823                 /* error in the urb, so we have to resubmit it */
 824                 dbg("%s - Overflow in write", __FUNCTION__);
 825                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 826                 port->write_urb->transfer_buffer_length = 1;
 827                 port->write_urb->dev = port->serial->dev;
 828                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 829                 if (result)
 830                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 831
 832                 return;
 833         }
 834
 835         schedule_work(&port->work);
 836 }
 837
 838
 839 static int __init pl2303_init (void)
 840 {
 841         int retval;
 842         retval = usb_serial_register(&pl2303_device);
 843         if (retval)
 844                 goto failed_usb_serial_register;
 845         retval = usb_register(&pl2303_driver);
 846         if (retval)
 847                 goto failed_usb_register;
 848         info(DRIVER_DESC " " DRIVER_VERSION);
 849         return 0;
 850 failed_usb_register:
 851         usb_serial_deregister(&pl2303_device);
 852 failed_usb_serial_register:
 853         return retval;
 854 }
 855
 856
 857 static void __exit pl2303_exit (void)
 858 {
 859         usb_deregister (&pl2303_driver);
 860         usb_serial_deregister (&pl2303_device);
 861 }
 862
 863
 864 module_init(pl2303_init);
 865 module_exit(pl2303_exit);
 866
 867 MODULE_DESCRIPTION(DRIVER_DESC);
 868 MODULE_LICENSE("GPL");
 869
 870 module_param(debug, bool, S_IRUGO | S_IWUSR);
 871 MODULE_PARM_DESC(debug, "Debug enabled or not");
 872