drivers/usb/serial/ir-usb.c

   1 /*
   2  * USB IR Dongle driver
   3  *
   4  *      Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
   5  *      Copyright (C) 2002      Gary Brubaker (xavyer@ix.netcom.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  * This driver allows a USB IrDA device to be used as a "dumb" serial device.
  13  * This can be useful if you do not have access to a full IrDA stack on the
  14  * other side of the connection.  If you do have an IrDA stack on both devices,
  15  * please use the usb-irda driver, as it contains the proper error checking and
  16  * other goodness of a full IrDA stack.
  17  *
  18  * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
  19  * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
  20  * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
  21  *
  22  * See Documentation/usb/usb-serial.txt for more information on using this driver
  23  *
  24  * 2002_Mar_07  greg kh
  25  *      moved some needed structures and #define values from the
  26  *      net/irda/irda-usb.h file into our file, as we don't want to depend on
  27  *      that codebase compiling correctly :)
  28  *
  29  * 2002_Jan_14  gb
  30  *      Added module parameter to force specific number of XBOFs.
  31  *      Added ir_xbof_change().
  32  *      Reorganized read_bulk_callback error handling.
  33  *      Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
  34  *
  35  * 2001_Nov_08  greg kh
  36  *      Changed the irda_usb_find_class_desc() function based on comments and
  37  *      code from Martin Diehl.
  38  *
  39  * 2001_Nov_01  greg kh
  40  *      Added support for more IrDA USB devices.
  41  *      Added support for zero packet.  Added buffer override paramater, so
  42  *      users can transfer larger packets at once if they wish.  Both patches
  43  *      came from Dag Brattli <dag@obexcode.com>.
  44  *
  45  * 2001_Oct_07  greg kh
  46  *      initial version released.
  47  */
  48
  49 #include <linux/config.h>
  50 #include <linux/kernel.h>
  51 #include <linux/errno.h>
  52 #include <linux/init.h>
  53 #include <linux/slab.h>
  54 #include <linux/tty.h>
  55 #include <linux/tty_driver.h>
  56 #include <linux/tty_flip.h>
  57 #include <linux/module.h>
  58 #include <linux/spinlock.h>
  59 #include <asm/uaccess.h>
  60 #include <linux/usb.h>
  61 #include "usb-serial.h"
  62
  63 /*
  64  * Version Information
  65  */
  66 #define DRIVER_VERSION "v0.4"
  67 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
  68 #define DRIVER_DESC "USB IR Dongle driver"
  69
  70 /* USB IrDA class spec information */
  71 #define USB_CLASS_IRDA          0x02
  72 #define USB_DT_IRDA             0x21
  73 #define IU_REQ_GET_CLASS_DESC   0x06
  74 #define SPEED_2400              0x01
  75 #define SPEED_9600              0x02
  76 #define SPEED_19200             0x03
  77 #define SPEED_38400             0x04
  78 #define SPEED_57600             0x05
  79 #define SPEED_115200            0x06
  80 #define SPEED_576000            0x07
  81 #define SPEED_1152000           0x08
  82 #define SPEED_4000000           0x09
  83
  84 struct irda_class_desc {
  85         u8      bLength;
  86         u8      bDescriptorType;
  87         u16     bcdSpecRevision;
  88         u8      bmDataSize;
  89         u8      bmWindowSize;
  90         u8      bmMinTurnaroundTime;
  91         u16     wBaudRate;
  92         u8      bmAdditionalBOFs;
  93         u8      bIrdaRateSniff;
  94         u8      bMaxUnicastList;
  95 } __attribute__ ((packed));
  96
  97 static int debug;
  98
  99 /* if overridden by the user, then use their value for the size of the read and
 100  * write urbs */
 101 static int buffer_size;
 102 /* if overridden by the user, then use the specified number of XBOFs */
 103 static int xbof = -1;
 104
 105 static int  ir_startup (struct usb_serial *serial);
 106 static int  ir_open (struct usb_serial_port *port, struct file *filep);
 107 static void ir_close (struct usb_serial_port *port, struct file *filep);
 108 static int  ir_write (struct usb_serial_port *port, const unsigned char *buf, int count);
 109 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 110 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 111 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios);
 112
 113 static u8 ir_baud = 0;
 114 static u8 ir_xbof = 0;
 115 static u8 ir_add_bof = 0;
 116
 117 static struct usb_device_id id_table [] = {
 118         { USB_DEVICE(0x050f, 0x0180) },         /* KC Technology, KC-180 */
 119         { USB_DEVICE(0x08e9, 0x0100) },         /* XTNDAccess */
 120         { USB_DEVICE(0x09c4, 0x0011) },         /* ACTiSys ACT-IR2000U */
 121         { USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) },
 122         { }                                     /* Terminating entry */
 123 };
 124
 125 MODULE_DEVICE_TABLE (usb, id_table);
 126
 127 static struct usb_driver ir_driver = {
 128         .name =         "ir-usb",
 129         .probe =        usb_serial_probe,
 130         .disconnect =   usb_serial_disconnect,
 131         .id_table =     id_table,
 132         .no_dynamic_id =        1,
 133 };
 134
 135
 136 static struct usb_serial_driver ir_device = {
 137         .driver = {
 138                 .owner =        THIS_MODULE,
 139                 .name =         "ir-usb",
 140         },
 141         .description =          "IR Dongle",
 142         .id_table =             id_table,
 143         .num_interrupt_in =     1,
 144         .num_bulk_in =          1,
 145         .num_bulk_out =         1,
 146         .num_ports =            1,
 147         .set_termios =          ir_set_termios,
 148         .attach =               ir_startup,
 149         .open =                 ir_open,
 150         .close =                ir_close,
 151         .write =                ir_write,
 152         .write_bulk_callback =  ir_write_bulk_callback,
 153         .read_bulk_callback =   ir_read_bulk_callback,
 154 };
 155
 156 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
 157 {
 158         dbg("bLength=%x", desc->bLength);
 159         dbg("bDescriptorType=%x", desc->bDescriptorType);
 160         dbg("bcdSpecRevision=%x", desc->bcdSpecRevision);
 161         dbg("bmDataSize=%x", desc->bmDataSize);
 162         dbg("bmWindowSize=%x", desc->bmWindowSize);
 163         dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
 164         dbg("wBaudRate=%x", desc->wBaudRate);
 165         dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
 166         dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
 167         dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
 168 }
 169
 170 /*------------------------------------------------------------------*/
 171 /*
 172  * Function irda_usb_find_class_desc(dev, ifnum)
 173  *
 174  *    Returns instance of IrDA class descriptor, or NULL if not found
 175  *
 176  * The class descriptor is some extra info that IrDA USB devices will
 177  * offer to us, describing their IrDA characteristics. We will use that in
 178  * irda_usb_init_qos()
 179  *
 180  * Based on the same function in drivers/net/irda/irda-usb.c
 181  */
 182 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
 183 {
 184         struct irda_class_desc *desc;
 185         int ret;
 186
 187         desc = kzalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
 188         if (desc == NULL)
 189                 return NULL;
 190
 191         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
 192                         IU_REQ_GET_CLASS_DESC,
 193                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 194                         0, ifnum, desc, sizeof(*desc), 1000);
 195
 196         dbg("%s -  ret=%d", __FUNCTION__, ret);
 197         if (ret < sizeof(*desc)) {
 198                 dbg("%s - class descriptor read %s (%d)",
 199                                 __FUNCTION__,
 200                                 (ret<0) ? "failed" : "too short",
 201                                 ret);
 202                 goto error;
 203         }
 204         if (desc->bDescriptorType != USB_DT_IRDA) {
 205                 dbg("%s - bad class descriptor type", __FUNCTION__);
 206                 goto error;
 207         }
 208
 209         irda_usb_dump_class_desc(desc);
 210         return desc;
 211 error:
 212         kfree(desc);
 213         return NULL;
 214 }
 215
 216
 217 static u8 ir_xbof_change(u8 xbof)
 218 {
 219         u8 result;
 220         /* reference irda-usb.c */
 221         switch(xbof) {
 222                 case 48: result = 0x10; break;
 223                 case 28:
 224                 case 24: result = 0x20; break;
 225                 default:
 226                 case 12: result = 0x30; break;
 227                 case  5:
 228                 case  6: result = 0x40; break;
 229                 case  3: result = 0x50; break;
 230                 case  2: result = 0x60; break;
 231                 case  1: result = 0x70; break;
 232                 case  0: result = 0x80; break;
 233         }
 234         return(result);
 235 }
 236
 237
 238 static int ir_startup (struct usb_serial *serial)
 239 {
 240         struct irda_class_desc *irda_desc;
 241
 242         irda_desc = irda_usb_find_class_desc (serial->dev, 0);
 243         if (irda_desc == NULL) {
 244                 dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
 245                 return -ENODEV;
 246         }
 247
 248         dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
 249                 __FUNCTION__,
 250                 (irda_desc->wBaudRate & 0x0001) ? " 2400"    : "",
 251                 (irda_desc->wBaudRate & 0x0002) ? " 9600"    : "",
 252                 (irda_desc->wBaudRate & 0x0004) ? " 19200"   : "",
 253                 (irda_desc->wBaudRate & 0x0008) ? " 38400"   : "",
 254                 (irda_desc->wBaudRate & 0x0010) ? " 57600"   : "",
 255                 (irda_desc->wBaudRate & 0x0020) ? " 115200"  : "",
 256                 (irda_desc->wBaudRate & 0x0040) ? " 576000"  : "",
 257                 (irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
 258                 (irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");
 259
 260         switch( irda_desc->bmAdditionalBOFs ) {
 261                 case 0x01: ir_add_bof = 48; break;
 262                 case 0x02: ir_add_bof = 24; break;
 263                 case 0x04: ir_add_bof = 12; break;
 264                 case 0x08: ir_add_bof =  6; break;
 265                 case 0x10: ir_add_bof =  3; break;
 266                 case 0x20: ir_add_bof =  2; break;
 267                 case 0x40: ir_add_bof =  1; break;
 268                 case 0x80: ir_add_bof =  0; break;
 269                 default:;
 270         }
 271
 272         kfree (irda_desc);
 273
 274         return 0;
 275 }
 276
 277 static int ir_open (struct usb_serial_port *port, struct file *filp)
 278 {
 279         char *buffer;
 280         int result = 0;
 281
 282         dbg("%s - port %d", __FUNCTION__, port->number);
 283
 284         if (buffer_size) {
 285                 /* override the default buffer sizes */
 286                 buffer = kmalloc (buffer_size, GFP_KERNEL);
 287                 if (!buffer) {
 288                         dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
 289                         return -ENOMEM;
 290                 }
 291                 kfree (port->read_urb->transfer_buffer);
 292                 port->read_urb->transfer_buffer = buffer;
 293                 port->read_urb->transfer_buffer_length = buffer_size;
 294
 295                 buffer = kmalloc (buffer_size, GFP_KERNEL);
 296                 if (!buffer) {
 297                         dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
 298                         return -ENOMEM;
 299                 }
 300                 kfree (port->write_urb->transfer_buffer);
 301                 port->write_urb->transfer_buffer = buffer;
 302                 port->write_urb->transfer_buffer_length = buffer_size;
 303                 port->bulk_out_size = buffer_size;
 304         }
 305
 306         /* Start reading from the device */
 307         usb_fill_bulk_urb (
 308                 port->read_urb,
 309                 port->serial->dev,
 310                 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
 311                 port->read_urb->transfer_buffer,
 312                 port->read_urb->transfer_buffer_length,
 313                 ir_read_bulk_callback,
 314                 port);
 315         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 316         if (result)
 317                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 318
 319         return result;
 320 }
 321
 322 static void ir_close (struct usb_serial_port *port, struct file * filp)
 323 {
 324         dbg("%s - port %d", __FUNCTION__, port->number);
 325
 326         /* shutdown our bulk read */
 327         usb_kill_urb(port->read_urb);
 328 }
 329
 330 static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
 331 {
 332         unsigned char *transfer_buffer;
 333         int result;
 334         int transfer_size;
 335
 336         dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);
 337
 338         if (!port->tty) {
 339                 dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
 340                 return 0;
 341         }
 342
 343         if (count == 0)
 344                 return 0;
 345
 346         spin_lock(&port->lock);
 347         if (port->write_urb_busy) {
 348                 spin_unlock(&port->lock);
 349                 dbg("%s - already writing", __FUNCTION__);
 350                 return 0;
 351         }
 352         port->write_urb_busy = 1;
 353         spin_unlock(&port->lock);
 354
 355         transfer_buffer = port->write_urb->transfer_buffer;
 356         transfer_size = min(count, port->bulk_out_size - 1);
 357
 358         /*
 359          * The first byte of the packet we send to the device contains an
 360          * inband header which indicates an additional number of BOFs and
 361          * a baud rate change.
 362          *
 363          * See section 5.4.2.2 of the USB IrDA spec.
 364          */
 365         *transfer_buffer = ir_xbof | ir_baud;
 366         ++transfer_buffer;
 367
 368         memcpy (transfer_buffer, buf, transfer_size);
 369
 370         usb_fill_bulk_urb (
 371                 port->write_urb,
 372                 port->serial->dev,
 373                 usb_sndbulkpipe(port->serial->dev,
 374                         port->bulk_out_endpointAddress),
 375                 port->write_urb->transfer_buffer,
 376                 transfer_size + 1,
 377                 ir_write_bulk_callback,
 378                 port);
 379
 380         port->write_urb->transfer_flags = URB_ZERO_PACKET;
 381
 382         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 383         if (result) {
 384                 port->write_urb_busy = 0;
 385                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 386         } else
 387                 result = transfer_size;
 388
 389         return result;
 390 }
 391
 392 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 393 {
 394         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 395
 396         dbg("%s - port %d", __FUNCTION__, port->number);
 397
 398         port->write_urb_busy = 0;
 399         if (urb->status) {
 400                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 401                 return;
 402         }
 403
 404         usb_serial_debug_data (
 405                 debug,
 406                 &port->dev,
 407                 __FUNCTION__,
 408                 urb->actual_length,
 409                 urb->transfer_buffer);
 410
 411         schedule_work(&port->work);
 412 }
 413
 414 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 415 {
 416         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 417         struct tty_struct *tty;
 418         unsigned char *data = urb->transfer_buffer;
 419         int result;
 420
 421         dbg("%s - port %d", __FUNCTION__, port->number);
 422
 423         if (!port->open_count) {
 424                 dbg("%s - port closed.", __FUNCTION__);
 425                 return;
 426         }
 427
 428         switch (urb->status) {
 429
 430                 case 0: /* Successful */
 431
 432                         /*
 433                          * The first byte of the packet we get from the device
 434                          * contains a busy indicator and baud rate change.
 435                          * See section 5.4.1.2 of the USB IrDA spec.
 436                          */
 437                         if ((*data & 0x0f) > 0)
 438                                 ir_baud = *data & 0x0f;
 439
 440                         usb_serial_debug_data (
 441                                 debug,
 442                                 &port->dev,
 443                                 __FUNCTION__,
 444                                 urb->actual_length,
 445                                 data);
 446
 447                         /*
 448                          * Bypass flip-buffers, and feed the ldisc directly
 449                          * due to our potentially large buffer size.  Since we
 450                          * used to set low_latency, this is exactly what the
 451                          * tty layer did anyway :)
 452                          */
 453                         tty = port->tty;
 454
 455                         /*
 456                          *      FIXME: must not do this in IRQ context,
 457                          *      must honour TTY_DONT_FLIP
 458                          */
 459                         tty->ldisc.receive_buf(
 460                                 tty,
 461                                 data+1,
 462                                 NULL,
 463                                 urb->actual_length-1);
 464
 465                         /*
 466                          * No break here.
 467                          * We want to resubmit the urb so we can read
 468                          * again.
 469                          */
 470
 471                 case -EPROTO: /* taking inspiration from pl2303.c */
 472
 473                         /* Continue trying to always read */
 474                         usb_fill_bulk_urb (
 475                                 port->read_urb,
 476                                 port->serial->dev,
 477                                 usb_rcvbulkpipe(port->serial->dev,
 478                                         port->bulk_in_endpointAddress),
 479                                 port->read_urb->transfer_buffer,
 480                                 port->read_urb->transfer_buffer_length,
 481                                 ir_read_bulk_callback,
 482                                 port);
 483
 484                         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 485                         if (result)
 486                                 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
 487                                         __FUNCTION__, result);
 488
 489                         break ;
 490
 491                 default:
 492                         dbg("%s - nonzero read bulk status received: %d",
 493                                 __FUNCTION__,
 494                                 urb->status);
 495                         break ;
 496
 497         }
 498
 499         return;
 500 }
 501
 502 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 503 {
 504         unsigned char *transfer_buffer;
 505         unsigned int cflag;
 506         int result;
 507
 508         dbg("%s - port %d", __FUNCTION__, port->number);
 509
 510         if ((!port->tty) || (!port->tty->termios)) {
 511                 dbg("%s - no tty structures", __FUNCTION__);
 512                 return;
 513         }
 514
 515         cflag = port->tty->termios->c_cflag;
 516         /* check that they really want us to change something */
 517         if (old_termios) {
 518                 if ((cflag == old_termios->c_cflag) &&
 519                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 520                         dbg("%s - nothing to change...", __FUNCTION__);
 521                         return;
 522                 }
 523         }
 524
 525         /* All we can change is the baud rate */
 526         if (cflag & CBAUD) {
 527
 528                 dbg ("%s - asking for baud %d",
 529                         __FUNCTION__,
 530                         tty_get_baud_rate(port->tty));
 531
 532                 /*
 533                  * FIXME, we should compare the baud request against the
 534                  * capability stated in the IR header that we got in the
 535                  * startup function.
 536                  */
 537                 switch (cflag & CBAUD) {
 538                         case B2400:    ir_baud = SPEED_2400;    break;
 539                         default:
 540                         case B9600:    ir_baud = SPEED_9600;    break;
 541                         case B19200:   ir_baud = SPEED_19200;   break;
 542                         case B38400:   ir_baud = SPEED_38400;   break;
 543                         case B57600:   ir_baud = SPEED_57600;   break;
 544                         case B115200:  ir_baud = SPEED_115200;  break;
 545                         case B576000:  ir_baud = SPEED_576000;  break;
 546                         case B1152000: ir_baud = SPEED_1152000; break;
 547 #ifdef B4000000
 548                         case B4000000: ir_baud = SPEED_4000000; break;
 549 #endif
 550                 }
 551
 552                 if (xbof == -1) {
 553                         ir_xbof = ir_xbof_change(ir_add_bof);
 554                 } else {
 555                         ir_xbof = ir_xbof_change(xbof) ;
 556                 }
 557
 558                 /* Notify the tty driver that the termios have changed. */
 559                 port->tty->ldisc.set_termios(port->tty, NULL);
 560
 561                 /* FIXME need to check to see if our write urb is busy right
 562                  * now, or use a urb pool.
 563                  *
 564                  * send the baud change out on an "empty" data packet
 565                  */
 566                 transfer_buffer = port->write_urb->transfer_buffer;
 567                 *transfer_buffer = ir_xbof | ir_baud;
 568
 569                 usb_fill_bulk_urb (
 570                         port->write_urb,
 571                         port->serial->dev,
 572                         usb_sndbulkpipe(port->serial->dev,
 573                                 port->bulk_out_endpointAddress),
 574                         port->write_urb->transfer_buffer,
 575                         1,
 576                         ir_write_bulk_callback,
 577                         port);
 578
 579                 port->write_urb->transfer_flags = URB_ZERO_PACKET;
 580
 581                 result = usb_submit_urb (port->write_urb, GFP_KERNEL);
 582                 if (result)
 583                         dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 584         }
 585         return;
 586 }
 587
 588
 589 static int __init ir_init (void)
 590 {
 591         int retval;
 592         retval = usb_serial_register(&ir_device);
 593         if (retval)
 594                 goto failed_usb_serial_register;
 595         retval = usb_register(&ir_driver);
 596         if (retval)
 597                 goto failed_usb_register;
 598         info(DRIVER_DESC " " DRIVER_VERSION);
 599         return 0;
 600 failed_usb_register:
 601         usb_serial_deregister(&ir_device);
 602 failed_usb_serial_register:
 603         return retval;
 604 }
 605
 606
 607 static void __exit ir_exit (void)
 608 {
 609         usb_deregister (&ir_driver);
 610         usb_serial_deregister (&ir_device);
 611 }
 612
 613
 614 module_init(ir_init);
 615 module_exit(ir_exit);
 616
 617 MODULE_AUTHOR(DRIVER_AUTHOR);
 618 MODULE_DESCRIPTION(DRIVER_DESC);
 619 MODULE_LICENSE("GPL");
 620
 621 module_param(debug, bool, S_IRUGO | S_IWUSR);
 622 MODULE_PARM_DESC(debug, "Debug enabled or not");
 623 module_param(xbof, int, 0);
 624 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
 625 module_param(buffer_size, int, 0);
 626 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
 627